X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fmeshlink.c;h=88a4c31991a9a340e32edde80523b6686b62b354;hb=HEAD;hp=b84465822c1f624b625eb7895e47233b30e9c64a;hpb=239fc1ea5c7a83829aa608568911391777817b74;p=meshlink diff --git a/src/meshlink.c b/src/meshlink.c index b8446582..a1a2ec40 100644 --- a/src/meshlink.c +++ b/src/meshlink.c @@ -1,6 +1,6 @@ /* meshlink.c -- Implementation of the MeshLink API. - Copyright (C) 2014-2018 Guus Sliepen + Copyright (C) 2014-2021 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -16,27 +16,21 @@ with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ -#define VAR_SERVER 1 /* Should be in meshlink.conf */ -#define VAR_HOST 2 /* Can be in host config file */ -#define VAR_MULTIPLE 4 /* Multiple statements allowed */ -#define VAR_OBSOLETE 8 /* Should not be used anymore */ -#define VAR_SAFE 16 /* Variable is safe when accepting invitations */ -#define MAX_ADDRESS_LENGTH 45 /* Max length of an (IPv6) address */ -#define MAX_PORT_LENGTH 5 /* 0-65535 */ -typedef struct { - const char *name; - int type; -} var_t; #include "system.h" #include +#include "adns.h" #include "crypto.h" #include "ecdsagen.h" #include "logger.h" #include "meshlink_internal.h" +#include "net.h" #include "netutl.h" #include "node.h" +#include "submesh.h" +#include "packmsg.h" +#include "prf.h" #include "protocol.h" #include "route.h" #include "sockaddr.h" @@ -44,46 +38,17 @@ typedef struct { #include "xalloc.h" #include "ed25519/sha512.h" #include "discovery.h" +#include "devtools.h" +#include "graph.h" #ifndef MSG_NOSIGNAL #define MSG_NOSIGNAL 0 #endif - __thread meshlink_errno_t meshlink_errno; meshlink_log_cb_t global_log_cb; meshlink_log_level_t global_log_level; -//TODO: this can go away completely -const var_t variables[] = { - /* Server configuration */ - {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE}, - {"Name", VAR_SERVER}, - /* Host configuration */ - {"CanonicalAddress", VAR_HOST}, - {"Address", VAR_HOST | VAR_MULTIPLE}, - {"ECDSAPublicKey", VAR_HOST}, - {"Port", VAR_HOST}, - {NULL, 0} -}; - -static bool fcopy(FILE *out, const char *filename) { - FILE *in = fopen(filename, "r"); - - if(!in) { - logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno)); - return false; - } - - char buf[1024]; - size_t len; - - while((len = fread(buf, 1, sizeof(buf), in))) { - fwrite(buf, len, 1, out); - } - - fclose(in); - return true; -} +typedef bool (*search_node_by_condition_t)(const node_t *, const void *); static int rstrip(char *value) { int len = strlen(value); @@ -95,66 +60,18 @@ static int rstrip(char *value) { return len; } -static void scan_for_canonical_address(const char *filename, char **hostname, char **port) { - char line[4096]; - - if(!filename || (*hostname && *port)) { +static void get_canonical_address(node_t *n, char **hostname, char **port) { + if(!n->canonical_address) { return; } - FILE *f = fopen(filename, "r"); - - if(!f) { - return; - } - - while(fgets(line, sizeof(line), f)) { - if(!rstrip(line)) { - continue; - } - - char *p = line, *q; - p += strcspn(p, "\t ="); - - if(!*p) { - continue; - } - - q = p + strspn(p, "\t "); - - if(*q == '=') { - q += 1 + strspn(q + 1, "\t "); - } - - // q is now pointing to the hostname - *p = 0; - p = q + strcspn(q, "\t "); - - if(*p) { - *p++ = 0; - } - - p += strspn(p, "\t "); - p[strcspn(p, "\t ")] = 0; - // p is now pointing to the port, if present - - if(!*port && !strcasecmp(line, "Port")) { - *port = xstrdup(q); - } else if(!strcasecmp(line, "CanonicalAddress")) { - *hostname = xstrdup(q); - - if(*p) { - free(*port); - *port = xstrdup(p); - } - } + *hostname = xstrdup(n->canonical_address); + char *space = strchr(*hostname, ' '); - if(*hostname && *port) { - break; - } + if(space) { + *space++ = 0; + *port = xstrdup(space); } - - fclose(f); } static bool is_valid_hostname(const char *hostname) { @@ -203,22 +120,69 @@ static void set_timeout(int sock, int timeout) { setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); } +struct socket_in_netns_params { + int domain; + int type; + int protocol; + int netns; + int fd; +}; + +#ifdef HAVE_SETNS +static void *socket_in_netns_thread(void *arg) { + struct socket_in_netns_params *params = arg; + + if(setns(params->netns, CLONE_NEWNET) == -1) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + params->fd = socket(params->domain, params->type, params->protocol); + + return NULL; +} +#endif // HAVE_SETNS + +static int socket_in_netns(int domain, int type, int protocol, int netns) { + if(netns == -1) { + return socket(domain, type, protocol); + } + +#ifdef HAVE_SETNS + struct socket_in_netns_params params = {domain, type, protocol, netns, -1}; + + pthread_t thr; + + if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) { + if(pthread_join(thr, NULL) != 0) { + abort(); + } + } + + return params.fd; +#else + return -1; +#endif // HAVE_SETNS + +} + // Find out what local address a socket would use if we connect to the given address. // We do this using connect() on a UDP socket, so the kernel has to resolve the address // of both endpoints, but this will actually not send any UDP packet. -static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) { +static bool getlocaladdr(const char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) { struct addrinfo *rai = NULL; const struct addrinfo hint = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_DGRAM, .ai_protocol = IPPROTO_UDP, + .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV, }; if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) { return false; } - int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol); + int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns); if(sock == -1) { freeaddrinfo(rai); @@ -233,17 +197,24 @@ static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) { freeaddrinfo(rai); - struct sockaddr_storage sn; - socklen_t sl = sizeof(sn); - - if(getsockname(sock, (struct sockaddr *)&sn, &sl)) { + if(getsockname(sock, &sa->sa, salen)) { closesocket(sock); return false; } closesocket(sock); + return true; +} + +static bool getlocaladdrname(const char *destaddr, char *host, socklen_t hostlen, int netns) { + sockaddr_t sa; + socklen_t salen = sizeof(sa); + + if(!getlocaladdr(destaddr, &sa, &salen, netns)) { + return false; + } - if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) { + if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) { return false; } @@ -255,19 +226,55 @@ char *meshlink_get_external_address(meshlink_handle_t *mesh) { } char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) { - char *hostname = NULL; + logger(mesh, MESHLINK_DEBUG, "meshlink_get_external_address_for_family(%d)", family); + const char *url = mesh->external_address_url; + + if(!url) { + url = "http://meshlink.io/host.cgi"; + } + + /* Find the hostname part between the slashes */ + if(strncmp(url, "http://", 7)) { + abort(); + meshlink_errno = MESHLINK_EINTERNAL; + return NULL; + } + + const char *begin = url + 7; + + const char *end = strchr(begin, '/'); + + if(!end) { + end = begin + strlen(begin); + } + + /* Make a copy */ + char host[end - begin + 1]; + strncpy(host, begin, end - begin); + host[end - begin] = 0; + + char *port = strchr(host, ':'); + + if(port) { + *port++ = 0; + } logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n"); - struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM); - static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n"; + struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), SOCK_STREAM, 5); char line[256]; + char *hostname = NULL; for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) { if(family != AF_UNSPEC && aip->ai_family != family) { continue; } - int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol); + int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns); + +#ifdef SO_NOSIGPIPE + int nosigpipe = 1; + setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe)); +#endif if(s >= 0) { set_timeout(s, 5000); @@ -279,7 +286,9 @@ char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int fami } if(s >= 0) { - send(s, request, sizeof(request) - 1, 0); + send(s, "GET ", 4, 0); + send(s, url, strlen(url), 0); + send(s, " HTTP/1.0\r\n\r\n", 13, 0); int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL); if(len > 0) { @@ -321,19 +330,113 @@ char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int fami return hostname; } +static bool is_localaddr(sockaddr_t *sa) { + switch(sa->sa.sa_family) { + case AF_INET: + return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127; + + case AF_INET6: { + uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1]; + return first == 0 || (first & 0xffc0) == 0xfe80; + } + + default: + return false; + } +} + +#ifdef HAVE_GETIFADDRS +struct getifaddrs_in_netns_params { + struct ifaddrs **ifa; + int netns; +}; + +#ifdef HAVE_SETNS +static void *getifaddrs_in_netns_thread(void *arg) { + struct getifaddrs_in_netns_params *params = arg; + + if(setns(params->netns, CLONE_NEWNET) == -1) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(getifaddrs(params->ifa) != 0) { + *params->ifa = NULL; + } + + return NULL; +} +#endif // HAVE_SETNS + +static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) { + if(netns == -1) { + return getifaddrs(ifa); + } + +#ifdef HAVE_SETNS + struct getifaddrs_in_netns_params params = {ifa, netns}; + pthread_t thr; + + if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) { + if(pthread_join(thr, NULL) != 0) { + abort(); + } + } + + return *params.ifa ? 0 : -1; +#else + return -1; +#endif // HAVE_SETNS + +} +#endif + char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) { - (void)mesh; + logger(mesh, MESHLINK_DEBUG, "meshlink_get_local_address_for_family(%d)", family); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } // Determine address of the local interface used for outgoing connections. char localaddr[NI_MAXHOST]; bool success = false; if(family == AF_INET) { - success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr)); + success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns); } else if(family == AF_INET6) { - success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr)); + success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns); + } + +#ifdef HAVE_GETIFADDRS + + if(!success) { + struct ifaddrs *ifa = NULL; + getifaddrs_in_netns(&ifa, mesh->netns); + + for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) { + sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr; + + if(!sa || sa->sa.sa_family != family) { + continue; + } + + if(is_localaddr(sa)) { + continue; + } + + if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) { + success = true; + break; + } + } + + freeifaddrs(ifa); } +#endif + if(!success) { meshlink_errno = MESHLINK_ENETWORK; return NULL; @@ -342,7 +445,7 @@ char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) return xstrdup(localaddr); } -void remove_duplicate_hostnames(char *host[], char *port[], int n) { +static void remove_duplicate_hostnames(char *host[], char *port[], int n) { for(int i = 0; i < n; i++) { if(!host[i]) { continue; @@ -368,7 +471,7 @@ void remove_duplicate_hostnames(char *host[], char *port[], int n) { break; } - if(found) { + if(found || !is_valid_hostname(host[i])) { free(host[i]); free(port[i]); host[i] = NULL; @@ -380,10 +483,15 @@ void remove_duplicate_hostnames(char *host[], char *port[], int n) { // This gets the hostname part for use in invitation URLs static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) { - char *hostname[4] = {NULL}; - char *port[4] = {NULL}; + int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0); + int n = 0; + char *hostname[count]; + char *port[count]; char *hostport = NULL; + memset(hostname, 0, sizeof(hostname)); + memset(port, 0, sizeof(port)); + if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) { flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC; } @@ -392,113 +500,90 @@ static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) { flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6; } + // Add all explicitly set invitation addresses + if(mesh->invitation_addresses) { + for list_each(char, combo, mesh->invitation_addresses) { + hostname[n] = xstrdup(combo); + char *slash = strrchr(hostname[n], '/'); + + if(slash) { + *slash = 0; + port[n] = xstrdup(slash + 1); + } + + n++; + } + } + // Add local addresses if requested if(flags & MESHLINK_INVITE_LOCAL) { if(flags & MESHLINK_INVITE_IPV4) { - hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET); + hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET); } if(flags & MESHLINK_INVITE_IPV6) { - hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6); + hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6); } } // Add public/canonical addresses if requested if(flags & MESHLINK_INVITE_PUBLIC) { // Try the CanonicalAddress first - char filename[PATH_MAX] = ""; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name); - scan_for_canonical_address(filename, &hostname[2], &port[2]); + get_canonical_address(mesh->self, &hostname[n], &port[n]); - if(!hostname[2]) { + if(!hostname[n] && count == 4) { if(flags & MESHLINK_INVITE_IPV4) { - hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET); + hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET); } if(flags & MESHLINK_INVITE_IPV6) { - hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6); + hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6); } + } else { + n++; } } - for(int i = 0; i < 4; i++) { + for(int i = 0; i < n; i++) { // Ensure we always have a port number if(hostname[i] && !port[i]) { port[i] = xstrdup(mesh->myport); } } - remove_duplicate_hostnames(hostname, port, 4); - - if(!(flags & MESHLINK_INVITE_NUMERIC)) { - for(int i = 0; i < 4; i++) { - if(!hostname[i]) { - continue; - } - - // Convert what we have to a sockaddr - struct addrinfo *ai_in, *ai_out; - struct addrinfo hint = { - .ai_family = AF_UNSPEC, - .ai_flags = AI_NUMERICSERV, - .ai_socktype = SOCK_STREAM, - }; - int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in); + remove_duplicate_hostnames(hostname, port, n); - if(err || !ai_in) { - continue; - } - - // Convert it to a hostname - char resolved_host[NI_MAXHOST]; - char resolved_port[NI_MAXSERV]; - err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV); - - if(err) { - freeaddrinfo(ai_in); - continue; - } - - // Convert the hostname back to a sockaddr - hint.ai_family = ai_in->ai_family; - err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out); - - if(err || !ai_out) { - freeaddrinfo(ai_in); - continue; - } + // Resolve the hostnames + for(int i = 0; i < n; i++) { + if(!hostname[i]) { + continue; + } - // Check if it's still the same sockaddr - if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) { - freeaddrinfo(ai_in); - freeaddrinfo(ai_out); - continue; - } + // Convert what we have to a sockaddr + struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5); - // Yes: replace the hostname with the resolved one - free(hostname[i]); - hostname[i] = xstrdup(resolved_host); + if(!ai_in) { + continue; + } - freeaddrinfo(ai_in); - freeaddrinfo(ai_out); + // Remember the address(es) + for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) { + node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr); } + + freeaddrinfo(ai_in); + continue; } // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname - remove_duplicate_hostnames(hostname, port, 4); + remove_duplicate_hostnames(hostname, port, n); // Concatenate all unique address to the hostport string - for(int i = 0; i < 4; i++) { + for(int i = 0; i < n; i++) { if(!hostname[i]) { continue; } - // Ensure we have the same addresses in our own host config file. - char *tmphostport; - xasprintf(&tmphostport, "%s %s", hostname[i], port[i]); - append_config_file(mesh, mesh->self->name, "Address", tmphostport); - free(tmphostport); - // Append the address to the hostport string char *newhostport; xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]); @@ -512,65 +597,7 @@ static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) { return hostport; } -static char *get_line(const char **data) { - if(!data || !*data) { - return NULL; - } - - if(! **data) { - *data = NULL; - return NULL; - } - - static char line[1024]; - const char *end = strchr(*data, '\n'); - size_t len = end ? (size_t)(end - *data) : strlen(*data); - - if(len >= sizeof(line)) { - logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n"); - return NULL; - } - - if(len && !isprint(**data)) { - abort(); - } - - memcpy(line, *data, len); - line[len] = 0; - - if(end) { - *data = end + 1; - } else { - *data = NULL; - } - - return line; -} - -static char *get_value(const char *data, const char *var) { - char *line = get_line(&data); - - if(!line) { - return NULL; - } - - char *sep = line + strcspn(line, " \t="); - char *val = sep + strspn(sep, " \t"); - - if(*val == '=') { - val += 1 + strspn(val + 1, " \t"); - } - - *sep = 0; - - if(strcasecmp(line, var)) { - return NULL; - } - - return val; -} - -static bool try_bind(int port) { +static bool try_bind(meshlink_handle_t *mesh, int port) { struct addrinfo *ai = NULL; struct addrinfo hint = { .ai_flags = AI_PASSIVE, @@ -586,46 +613,49 @@ static bool try_bind(int port) { return false; } - while(ai) { - int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP); + bool success = false; - if(!fd) { - freeaddrinfo(ai); - return false; + for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) { + /* Try to bind to TCP. */ + + int tcp_fd = setup_tcp_listen_socket(mesh, aip); + + if(tcp_fd == -1) { + if(errno == EADDRINUSE) { + /* If this port is in use for any address family, avoid it. */ + success = false; + break; + } else { + continue; + } } - int result = bind(fd, ai->ai_addr, ai->ai_addrlen); - closesocket(fd); + /* If TCP worked, then we require that UDP works as well. */ - if(result) { - freeaddrinfo(ai); - return false; + int udp_fd = setup_udp_listen_socket(mesh, aip); + + if(udp_fd == -1) { + closesocket(tcp_fd); + success = false; + break; } - ai = ai->ai_next; + closesocket(tcp_fd); + closesocket(udp_fd); + success = true; } freeaddrinfo(ai); - return true; + return success; } int check_port(meshlink_handle_t *mesh) { for(int i = 0; i < 1000; i++) { - int port = 0x1000 + (rand() & 0x7fff); + int port = 0x1000 + prng(mesh, 0x7000); - if(try_bind(port)) { - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name); - FILE *f = fopen(filename, "a"); - - if(!f) { - meshlink_errno = MESHLINK_ESTORAGE; - logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n"); - return 0; - } - - fprintf(f, "Port = %d\n", port); - fclose(f); + if(try_bind(mesh, port)) { + free(mesh->myport); + xasprintf(&mesh->myport, "%d", port); return port; } } @@ -635,221 +665,198 @@ int check_port(meshlink_handle_t *mesh) { return 0; } -static void deltree(const char *dirname) { - DIR *d = opendir(dirname); - - if(d) { - struct dirent *ent; +static bool write_main_config_files(meshlink_handle_t *mesh) { + if(!mesh->confbase) { + return true; + } - while((ent = readdir(d))) { - if(ent->d_name[0] == '.') { - continue; - } + uint8_t buf[4096]; - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name); + /* Write the main config file */ + packmsg_output_t out = {buf, sizeof buf}; - if(unlink(filename)) { - deltree(filename); - } - } + packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION); + packmsg_add_str(&out, mesh->name); + packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96); + packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96); + packmsg_add_uint16(&out, atoi(mesh->myport)); - closedir(d); + if(!packmsg_output_ok(&out)) { + return false; } - rmdir(dirname); -} - -static bool finalize_join(meshlink_handle_t *mesh) { - char *name = xstrdup(get_value(mesh->data, "Name")); + config_t config = {buf, packmsg_output_size(&out, buf)}; - if(!name) { - logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n"); + if(!main_config_write(mesh, "current", &config, mesh->config_key)) { return false; } - if(!check_id(name)) { - logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name); + /* Write our own host config file */ + if(!node_write_config(mesh, mesh->self, true)) { return false; } - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase); + return true; +} + +typedef struct { + meshlink_handle_t *mesh; + int sock; + char cookie[18 + 32]; + char hash[18]; + bool success; + sptps_t sptps; + char *data; + size_t thedatalen; + size_t blen; + char line[4096]; + char buffer[4096]; +} join_state_t; - FILE *f = fopen(filename, "w"); +static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) { + meshlink_handle_t *mesh = state->mesh; + packmsg_input_t in = {buf, len}; + uint32_t version = packmsg_get_uint32(&in); - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); + if(version != MESHLINK_INVITATION_VERSION) { + logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n"); return false; } - fprintf(f, "Name = %s\n", name); + char *name = packmsg_get_str_dup(&in); + char *submesh_name = packmsg_get_str_dup(&in); + dev_class_t devclass = packmsg_get_int32(&in); + uint32_t count = packmsg_get_array(&in); - // Wipe all old host config files and invitations - snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase); - deltree(filename); + if(!name || !check_id(name)) { + logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n"); + free(name); + free(submesh_name); + return false; + } - if(mkdir(filename, 0777) && errno != EEXIST) { - logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno)); + if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) { + logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n"); + free(name); + free(submesh_name); return false; } - snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase); - deltree(filename); + if(!count) { + logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n"); + free(name); + free(submesh_name); + return false; + } - // Create a new host config file for ourself - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); - FILE *fh = fopen(filename, "w"); + free(mesh->name); + free(mesh->self->name); + mesh->name = name; + mesh->self->name = xstrdup(name); + mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL; + free(submesh_name); + mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass; - if(!fh) { - logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); - fclose(f); + // Initialize configuration directory + if(!config_init(mesh, "current")) { return false; } - // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name - // Other chunks go unfiltered to their respective host config files - const char *p = mesh->data; - char *l, *value; - - while((l = get_line(&p))) { - // Ignore comments - if(*l == '#') { - continue; - } - - // Split line into variable and value - int len = strcspn(l, "\t ="); - value = l + len; - value += strspn(value, "\t "); - - if(*value == '=') { - value++; - value += strspn(value, "\t "); - } + if(!write_main_config_files(mesh)) { + return false; + } - l[len] = 0; + // Write host config files + for(uint32_t i = 0; i < count; i++) { + const void *data; + uint32_t data_len = packmsg_get_bin_raw(&in, &data); - // Is it a Name? - if(!strcasecmp(l, "Name")) - if(strcmp(value, name)) { - break; - } else { - continue; - } else if(!strcasecmp(l, "NetName")) { - continue; + if(!data_len) { + logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n"); + return false; } - // Check the list of known variables - bool found = false; - int i; - - for(i = 0; variables[i].name; i++) { - if(strcasecmp(l, variables[i].name)) { - continue; - } + packmsg_input_t in2 = {data, data_len}; + uint32_t version2 = packmsg_get_uint32(&in2); + char *name2 = packmsg_get_str_dup(&in2); - found = true; + if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) { + free(name2); + packmsg_input_invalidate(&in); break; } - // Ignore unknown and unsafe variables - if(!found) { - logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l); - continue; - } else if(!(variables[i].type & VAR_SAFE)) { - logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l); - continue; + if(!check_id(name2)) { + free(name2); + break; } - // Copy the safe variable to the right config file - fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value); - } - - fclose(f); - - while(l && !strcasecmp(l, "Name")) { - if(!check_id(value)) { - logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n"); + if(!strcmp(name2, mesh->name)) { + logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n"); + free(name2); + meshlink_errno = MESHLINK_EPEER; return false; } - if(!strcmp(value, name)) { - logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n"); - return false; - } + node_t *n = new_node(); + n->name = name2; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value); - f = fopen(filename, "w"); + config_t config = {data, data_len}; - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); + if(!node_read_from_config(mesh, n, &config)) { + free_node(n); + logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n"); + meshlink_errno = MESHLINK_EPEER; return false; } - while((l = get_line(&p))) { - if(!strcmp(l, "#---------------------------------------------------------------#")) { - continue; - } - - int len = strcspn(l, "\t ="); - - if(len == 4 && !strncasecmp(l, "Name", 4)) { - value = l + len; - value += strspn(value, "\t "); + if(i == 0) { + /* The first host config file is of the inviter itself; + * remember the address we are currently using for the invitation connection. + */ + sockaddr_t sa; + socklen_t salen = sizeof(sa); - if(*value == '=') { - value++; - value += strspn(value, "\t "); - } - - l[len] = 0; - break; + if(getpeername(state->sock, &sa.sa, &salen) == 0) { + node_add_recent_address(mesh, n, &sa); } + } - fputs(l, f); - fputc('\n', f); + /* Clear the reachability times, since we ourself have never seen these nodes yet */ + n->last_reachable = 0; + n->last_unreachable = 0; + + if(!node_write_config(mesh, n, true)) { + free_node(n); + return false; } - fclose(f); + node_add(mesh, n); } - char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa); - - if(!b64key) { - fclose(fh); + /* Ensure the configuration directory metadata is on disk */ + if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) { return false; } - fprintf(fh, "ECDSAPublicKey = %s\n", b64key); - fprintf(fh, "Port = %s\n", mesh->myport); - - fclose(fh); - - sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key)); - free(b64key); + if(!mesh->inviter_commits_first) { + devtool_set_inviter_commits_first(false); + } - free(mesh->name); - free(mesh->self->name); - free(mesh->self->connection->name); - mesh->name = xstrdup(name); - mesh->self->name = xstrdup(name); - mesh->self->connection->name = name; + sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32); logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase); - load_all_nodes(mesh); - return true; } static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) { (void)type; - meshlink_handle_t *mesh = handle; + join_state_t *state = handle; const char *ptr = data; while(len) { - int result = send(mesh->sock, ptr, len, 0); + int result = send(state->sock, ptr, len, 0); if(result == -1 && errno == EINTR) { continue; @@ -865,45 +872,57 @@ static bool invitation_send(void *handle, uint8_t type, const void *data, size_t } static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) { - meshlink_handle_t *mesh = handle; + join_state_t *state = handle; + meshlink_handle_t *mesh = state->mesh; + + if(mesh->inviter_commits_first) { + switch(type) { + case SPTPS_HANDSHAKE: + return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32); - switch(type) { - case SPTPS_HANDSHAKE: - return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie); + case 1: + break; - case 0: - mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1); - memcpy(mesh->data + mesh->thedatalen, msg, len); - mesh->thedatalen += len; - mesh->data[mesh->thedatalen] = 0; - break; + case 0: + if(!finalize_join(state, msg, len)) { + return false; + } - case 1: - mesh->thedatalen = 0; - return finalize_join(mesh); + logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n"); + shutdown(state->sock, SHUT_RDWR); + state->success = true; + break; - case 2: - logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n"); - shutdown(mesh->sock, SHUT_RDWR); - mesh->success = true; - break; + default: + return false; + } + } else { + switch(type) { + case SPTPS_HANDSHAKE: + return sptps_send_record(&state->sptps, 0, state->cookie, 18); - default: - return false; + case 0: + return finalize_join(state, msg, len); + + case 1: + logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n"); + shutdown(state->sock, SHUT_RDWR); + state->success = true; + break; + + default: + return false; + } } return true; } -static bool recvline(meshlink_handle_t *mesh, size_t len) { +static bool recvline(join_state_t *state) { char *newline = NULL; - if(!mesh->sock) { - abort(); - } - - while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) { - int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0); + while(!(newline = memchr(state->buffer, '\n', state->blen))) { + int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0); if(result == -1 && errno == EINTR) { continue; @@ -911,24 +930,25 @@ static bool recvline(meshlink_handle_t *mesh, size_t len) { return false; } - mesh->blen += result; + state->blen += result; } - if((size_t)(newline - mesh->buffer) >= len) { + if((size_t)(newline - state->buffer) >= sizeof(state->line)) { return false; } - len = newline - mesh->buffer; + size_t len = newline - state->buffer; - memcpy(mesh->line, mesh->buffer, len); - mesh->line[len] = 0; - memmove(mesh->buffer, newline + 1, mesh->blen - len - 1); - mesh->blen -= len + 1; + memcpy(state->line, state->buffer, len); + state->line[len] = 0; + memmove(state->buffer, newline + 1, state->blen - len - 1); + state->blen -= len + 1; return true; } -static bool sendline(int fd, char *format, ...) { - static char buffer[4096]; + +static bool sendline(int fd, const char *format, ...) { + char buffer[4096]; char *p = buffer; int blen = 0; va_list ap; @@ -973,6 +993,7 @@ static const char *errstr[] = { [MESHLINK_EPEER] = "Error communicating with peer", [MESHLINK_ENOTSUP] = "Operation not supported", [MESHLINK_EBUSY] = "MeshLink instance already in use", + [MESHLINK_EBLACKLISTED] = "Node is blacklisted", }; const char *meshlink_strerror(meshlink_errno_t err) { @@ -984,69 +1005,34 @@ const char *meshlink_strerror(meshlink_errno_t err) { } static bool ecdsa_keygen(meshlink_handle_t *mesh) { - ecdsa_t *key; - FILE *f; - char pubname[PATH_MAX], privname[PATH_MAX]; - - logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n"); - - if(!(key = ecdsa_generate())) { - logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n"); - meshlink_errno = MESHLINK_EINTERNAL; - return false; - } else { - logger(mesh, MESHLINK_DEBUG, "Done.\n"); - } - - if(snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) { - logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase); - meshlink_errno = MESHLINK_ESTORAGE; - return false; - } - - f = fopen(privname, "wb"); - - if(!f) { - meshlink_errno = MESHLINK_ESTORAGE; - return false; - } + logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n"); -#ifdef HAVE_FCHMOD - fchmod(fileno(f), 0600); -#endif + mesh->private_key = ecdsa_generate(); + mesh->invitation_key = ecdsa_generate(); - if(!ecdsa_write_pem_private_key(key, f)) { - logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n"); - ecdsa_free(key); - fclose(f); + if(!mesh->private_key || !mesh->invitation_key) { + logger(mesh, MESHLINK_ERROR, "Error during key generation!\n"); meshlink_errno = MESHLINK_EINTERNAL; return false; } - fclose(f); + logger(mesh, MESHLINK_DEBUG, "Done.\n"); - snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name); - f = fopen(pubname, "a"); + return true; +} - if(!f) { - meshlink_errno = MESHLINK_ESTORAGE; - return false; +static bool timespec_lt(const struct timespec *a, const struct timespec *b) { + if(a->tv_sec == b->tv_sec) { + return a->tv_nsec < b->tv_nsec; + } else { + return a->tv_sec < b->tv_sec; } - - char *pubkey = ecdsa_get_base64_public_key(key); - fprintf(f, "ECDSAPublicKey = %s\n", pubkey); - free(pubkey); - - fclose(f); - ecdsa_free(key); - - return true; } -static struct timeval idle(event_loop_t *loop, void *data) { +static struct timespec idle(event_loop_t *loop, void *data) { (void)loop; meshlink_handle_t *mesh = data; - struct timeval t, tmin = {3600, 0}; + struct timespec t, tmin = {3600, 0}; for splay_each(node_t, n, mesh->nodes) { if(!n->utcp) { @@ -1055,7 +1041,7 @@ static struct timeval idle(event_loop_t *loop, void *data) { t = utcp_timeout(n->utcp); - if(timercmp(&t, &tmin, <)) { + if(timespec_lt(&t, &tmin)) { tmin = t; } } @@ -1065,79 +1051,151 @@ static struct timeval idle(event_loop_t *loop, void *data) { // Get our local address(es) by simulating connecting to an Internet host. static void add_local_addresses(meshlink_handle_t *mesh) { - char host[NI_MAXHOST]; - char entry[MAX_STRING_SIZE]; + sockaddr_t sa; + sa.storage.ss_family = AF_UNKNOWN; + socklen_t salen = sizeof(sa); // IPv4 example.org - if(getlocaladdrname("93.184.216.34", host, sizeof(host))) { - snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport); - append_config_file(mesh, mesh->name, "Address", entry); + if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) { + sa.in.sin_port = ntohs(atoi(mesh->myport)); + node_add_recent_address(mesh, mesh->self, &sa); } // IPv6 example.org - if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) { - snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport); - append_config_file(mesh, mesh->name, "Address", entry); + salen = sizeof(sa); + + if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) { + sa.in6.sin6_port = ntohs(atoi(mesh->myport)); + node_add_recent_address(mesh, mesh->self, &sa); } } static bool meshlink_setup(meshlink_handle_t *mesh) { - if(mkdir(mesh->confbase, 0777) && errno != EEXIST) { - logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno)); + if(!config_destroy(mesh->confbase, "new")) { + logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno)); meshlink_errno = MESHLINK_ESTORAGE; return false; } - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase); + if(!config_destroy(mesh->confbase, "old")) { + logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + return false; + } - if(mkdir(filename, 0777) && errno != EEXIST) { - logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno)); + if(!config_init(mesh, "current")) { + logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno)); meshlink_errno = MESHLINK_ESTORAGE; return false; } - snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase); + if(!ecdsa_keygen(mesh)) { + meshlink_errno = MESHLINK_EINTERNAL; + return false; + } - if(!access(filename, F_OK)) { - logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename); - meshlink_errno = MESHLINK_EEXIST; + if(check_port(mesh) == 0) { + meshlink_errno = MESHLINK_ENETWORK; return false; } - FILE *f = fopen(filename, "w"); + /* Create a node for ourself */ - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); + mesh->self = new_node(); + mesh->self->name = xstrdup(mesh->name); + mesh->self->devclass = mesh->devclass; + mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key)); + mesh->self->session_id = mesh->session_id; + + if(!write_main_config_files(mesh)) { + logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno)); meshlink_errno = MESHLINK_ESTORAGE; return false; } - fprintf(f, "Name = %s\n", mesh->name); - fclose(f); + /* Ensure the configuration directory metadata is on disk */ + if(!config_sync(mesh, "current")) { + return false; + } + + return true; +} + +static bool meshlink_read_config(meshlink_handle_t *mesh) { + config_t config; - if(!ecdsa_keygen(mesh)) { - meshlink_errno = MESHLINK_EINTERNAL; - unlink(filename); + if(!main_config_read(mesh, "current", &config, mesh->config_key)) { + logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!"); return false; } - if(check_port(mesh) == 0) { - meshlink_errno = MESHLINK_ENETWORK; - unlink(filename); + packmsg_input_t in = {config.buf, config.len}; + const void *private_key; + const void *invitation_key; + + uint32_t version = packmsg_get_uint32(&in); + char *name = packmsg_get_str_dup(&in); + uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key); + uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key); + uint16_t myport = packmsg_get_uint16(&in); + + if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) { + logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!"); + free(name); + config_free(&config); + return false; + } + + if(mesh->name && strcmp(mesh->name, name)) { + logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name); + meshlink_errno = MESHLINK_ESTORAGE; + free(name); + config_free(&config); + return false; + } + + free(mesh->name); + mesh->name = name; + xasprintf(&mesh->myport, "%u", myport); + mesh->private_key = ecdsa_set_private_key(private_key); + mesh->invitation_key = ecdsa_set_private_key(invitation_key); + config_free(&config); + + /* Create a node for ourself and read our host configuration file */ + + mesh->self = new_node(); + mesh->self->name = xstrdup(name); + mesh->self->devclass = mesh->devclass; + mesh->self->session_id = mesh->session_id; + + if(!node_read_public_key(mesh, mesh->self)) { + logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!"); + meshlink_errno = MESHLINK_ESTORAGE; + free_node(mesh->self); + mesh->self = NULL; return false; } return true; } -meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) { - // Validate arguments provided by the application - bool usingname = false; +#ifdef HAVE_SETNS +static void *setup_network_in_netns_thread(void *arg) { + meshlink_handle_t *mesh = arg; + + if(setns(mesh->netns, CLONE_NEWNET) != 0) { + return NULL; + } + + bool success = setup_network(mesh); + return success ? arg : NULL; +} +#endif // HAVE_SETNS - logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n"); +meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass); if(!confbase || !*confbase) { logger(NULL, MESHLINK_ERROR, "No confbase given!\n"); @@ -1157,1725 +1215,3764 @@ meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const c return NULL; } - if(!name || !*name) { - logger(NULL, MESHLINK_ERROR, "No name given!\n"); - //return NULL; - } else { //check name only if there is a name != NULL - - if(!check_id(name)) { - logger(NULL, MESHLINK_ERROR, "Invalid name given!\n"); - meshlink_errno = MESHLINK_EINVAL; - return NULL; - } else { - usingname = true; - } + if(name && !check_id(name)) { + logger(NULL, MESHLINK_ERROR, "Invalid name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; } - if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) { + if(devclass < 0 || devclass >= DEV_CLASS_COUNT) { logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n"); meshlink_errno = MESHLINK_EINVAL; return NULL; } - meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t)); - mesh->confbase = xstrdup(confbase); - mesh->appname = xstrdup(appname); - mesh->devclass = devclass; - mesh->discovery = true; - mesh->invitation_timeout = 604800; // 1 week - - if(usingname) { - mesh->name = xstrdup(name); - } - - // initialize mutex - pthread_mutexattr_t attr; - pthread_mutexattr_init(&attr); - pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); - pthread_mutex_init(&(mesh->mesh_mutex), &attr); + meshlink_open_params_t *params = xzalloc(sizeof * params); - mesh->threadstarted = false; - event_loop_init(&mesh->loop); - mesh->loop.data = mesh; + params->confbase = xstrdup(confbase); + params->name = name ? xstrdup(name) : NULL; + params->appname = xstrdup(appname); + params->devclass = devclass; + params->netns = -1; - meshlink_queue_init(&mesh->outpacketqueue); + xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase); - // Check whether meshlink.conf already exists + return params; +} - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase); +bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns); - if(access(filename, R_OK)) { - if(errno == ENOENT) { - // If not, create it - if(!meshlink_setup(mesh)) { - // meshlink_errno is set by meshlink_setup() - return NULL; - } - } else { - logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno)); - meshlink_close(mesh); - meshlink_errno = MESHLINK_ESTORAGE; - return NULL; - } + if(!params) { + meshlink_errno = MESHLINK_EINVAL; + return false; } - // Open the configuration file and lock it - - mesh->conffile = fopen(filename, "r"); - - if(!mesh->conffile) { - logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", filename, strerror(errno)); - meshlink_close(mesh); - meshlink_errno = MESHLINK_ESTORAGE; - return NULL; - } + params->netns = netns; -#ifdef FD_CLOEXEC - fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC); -#endif + return true; +} -#ifdef HAVE_MINGW - // TODO: use _locking()? -#else +bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen); - if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) { - logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", filename, strerror(errno)); - meshlink_close(mesh); - meshlink_errno = MESHLINK_EBUSY; - return NULL; + if(!params) { + meshlink_errno = MESHLINK_EINVAL; + return false; } -#endif - - // Read the configuration - - init_configuration(&mesh->config); - - if(!read_server_config(mesh)) { - meshlink_close(mesh); - meshlink_errno = MESHLINK_ESTORAGE; - return NULL; - }; - -#ifdef HAVE_MINGW - struct WSAData wsa_state; + if((!key && keylen) || (key && !keylen)) { + logger(NULL, MESHLINK_ERROR, "Invalid key length!\n"); + meshlink_errno = MESHLINK_EINVAL; + return false; + } - WSAStartup(MAKEWORD(2, 2), &wsa_state); + params->key = key; + params->keylen = keylen; -#endif + return true; +} - // Setup up everything - // TODO: we should not open listening sockets yet +bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy); - if(!setup_network(mesh)) { - meshlink_close(mesh); - meshlink_errno = MESHLINK_ENETWORK; - return NULL; + if(!params) { + meshlink_errno = MESHLINK_EINVAL; + return false; } - add_local_addresses(mesh); - - idle_set(&mesh->loop, idle, mesh); + params->storage_policy = policy; - logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n"); - return mesh; + return true; } -static void *meshlink_main_loop(void *arg) { - meshlink_handle_t *mesh = arg; - - pthread_mutex_lock(&(mesh->mesh_mutex)); +bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename); - try_outgoing_connections(mesh); + if(!params || !filename) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } - logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n"); - main_loop(mesh); - logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n"); + free(params->lock_filename); + params->lock_filename = xstrdup(filename); - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + return true; } -bool meshlink_start(meshlink_handle_t *mesh) { - if(!mesh) { +bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) { + logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen); + + if(!mesh || !new_key || !new_keylen) { + logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n"); meshlink_errno = MESHLINK_EINVAL; return false; } - logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n"); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - pthread_mutex_lock(&(mesh->mesh_mutex)); + // Create hash for the new key + void *new_config_key; + new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN); - if(mesh->threadstarted) { - logger(mesh, MESHLINK_DEBUG, "thread was already running\n"); - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return true; + if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) { + logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n"); + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&mesh->mutex); + return false; } - if(mesh->listen_socket[0].tcp.fd < 0) { - logger(mesh, MESHLINK_ERROR, "Listening socket not open\n"); - meshlink_errno = MESHLINK_ENETWORK; + // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key + + if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) { + logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&mesh->mutex); return false; } - mesh->thedatalen = 0; + devtool_keyrotate_probe(1); - // TODO: open listening sockets first + // Rename confbase/current/ to confbase/old - //Check that a valid name is set - if(!mesh->name) { - logger(mesh, MESHLINK_DEBUG, "No name given!\n"); - meshlink_errno = MESHLINK_EINVAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!config_rename(mesh, "current", "old")) { + logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&mesh->mutex); return false; } - // Start the main thread + devtool_keyrotate_probe(2); - event_loop_start(&mesh->loop); + // Rename confbase/new/ to confbase/current - if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) { - logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno)); - memset(&mesh->thread, 0, sizeof(mesh)->thread); - meshlink_errno = MESHLINK_EINTERNAL; - event_loop_stop(&mesh->loop); - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!config_rename(mesh, "new", "current")) { + logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&mesh->mutex); return false; } - mesh->threadstarted = true; + devtool_keyrotate_probe(3); -#if HAVE_CATTA + // Cleanup the "old" confbase sub-directory - if(mesh->discovery) { - discovery_start(mesh); + if(!config_destroy(mesh->confbase, "old")) { + pthread_mutex_unlock(&mesh->mutex); + return false; } -#endif + // Change the mesh handle key with new key - pthread_mutex_unlock(&(mesh->mesh_mutex)); + free(mesh->config_key); + mesh->config_key = new_config_key; + + pthread_mutex_unlock(&mesh->mutex); + + return true; +} + +void meshlink_open_params_free(meshlink_open_params_t *params) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()"); + + if(!params) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + free(params->confbase); + free(params->name); + free(params->appname); + free(params->lock_filename); + + free(params); +} + +/// Device class traits +static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = { + { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE + { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY + { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE + { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN +}; + +meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass); + + if(!confbase || !*confbase) { + logger(NULL, MESHLINK_ERROR, "No confbase given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + char lock_filename[PATH_MAX]; + snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase); + + /* Create a temporary struct on the stack, to avoid allocating and freeing one. */ + meshlink_open_params_t params = { + .confbase = (char *)confbase, + .lock_filename = lock_filename, + .name = (char *)name, + .appname = (char *)appname, + .devclass = devclass, + .netns = -1, + }; + + return meshlink_open_ex(¶ms); +} + +meshlink_handle_t *meshlink_open_encrypted(const char *confbase, const char *name, const char *appname, dev_class_t devclass, const void *key, size_t keylen) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen); + + if(!confbase || !*confbase) { + logger(NULL, MESHLINK_ERROR, "No confbase given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + char lock_filename[PATH_MAX]; + snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase); + + /* Create a temporary struct on the stack, to avoid allocating and freeing one. */ + meshlink_open_params_t params = { + .confbase = (char *)confbase, + .lock_filename = lock_filename, + .name = (char *)name, + .appname = (char *)appname, + .devclass = devclass, + .netns = -1, + }; + + if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) { + return false; + } + + return meshlink_open_ex(¶ms); +} + +meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass); + + if(!name) { + logger(NULL, MESHLINK_ERROR, "No name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(!check_id(name)) { + logger(NULL, MESHLINK_ERROR, "Invalid name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(!appname || !*appname) { + logger(NULL, MESHLINK_ERROR, "No appname given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(strchr(appname, ' ')) { + logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(devclass < 0 || devclass >= DEV_CLASS_COUNT) { + logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + /* Create a temporary struct on the stack, to avoid allocating and freeing one. */ + meshlink_open_params_t params = { + .name = (char *)name, + .appname = (char *)appname, + .devclass = devclass, + .netns = -1, + }; + + return meshlink_open_ex(¶ms); +} + +meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) { + logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()"); + + // Validate arguments provided by the application + if(!params->appname || !*params->appname) { + logger(NULL, MESHLINK_ERROR, "No appname given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(strchr(params->appname, ' ')) { + logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(params->name && !check_id(params->name)) { + logger(NULL, MESHLINK_ERROR, "Invalid name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) { + logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if((params->key && !params->keylen) || (!params->key && params->keylen)) { + logger(NULL, MESHLINK_ERROR, "Invalid key length!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t)); + + if(params->confbase) { + mesh->confbase = xstrdup(params->confbase); + } + + mesh->appname = xstrdup(params->appname); + mesh->devclass = params->devclass; + mesh->discovery.enabled = true; + mesh->invitation_timeout = 604800; // 1 week + mesh->netns = params->netns; + mesh->submeshes = NULL; + mesh->log_cb = global_log_cb; + mesh->log_level = global_log_level; + mesh->packet = xmalloc(sizeof(vpn_packet_t)); + + randomize(&mesh->prng_state, sizeof(mesh->prng_state)); + + do { + randomize(&mesh->session_id, sizeof(mesh->session_id)); + } while(mesh->session_id == 0); + + memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits)); + + mesh->name = params->name ? xstrdup(params->name) : NULL; + + // Hash the key + if(params->key) { + mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN); + + if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) { + logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n"); + meshlink_close(mesh); + meshlink_errno = MESHLINK_EINTERNAL; + return NULL; + } + } + + // initialize mutexes and conds + pthread_mutexattr_t attr; + pthread_mutexattr_init(&attr); + + if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) { + abort(); + } + + pthread_mutex_init(&mesh->mutex, &attr); + pthread_cond_init(&mesh->cond, NULL); + + pthread_cond_init(&mesh->adns_cond, NULL); + + mesh->threadstarted = false; + event_loop_init(&mesh->loop); + mesh->loop.data = mesh; + + meshlink_queue_init(&mesh->outpacketqueue); + + // Atomically lock the configuration directory. + if(!main_config_lock(mesh, params->lock_filename)) { + meshlink_close(mesh); + return NULL; + } + + // If no configuration exists yet, create it. + + bool new_configuration = false; + + if(!meshlink_confbase_exists(mesh)) { + if(!mesh->name) { + logger(NULL, MESHLINK_ERROR, "No configuration files found!\n"); + meshlink_close(mesh); + meshlink_errno = MESHLINK_ESTORAGE; + return NULL; + } + + if(!meshlink_setup(mesh)) { + logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n"); + meshlink_close(mesh); + return NULL; + } + + new_configuration = true; + } else { + if(!meshlink_read_config(mesh)) { + logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n"); + meshlink_close(mesh); + return NULL; + } + } + + mesh->storage_policy = params->storage_policy; + +#ifdef HAVE_MINGW + struct WSAData wsa_state; + WSAStartup(MAKEWORD(2, 2), &wsa_state); +#endif + + // Setup up everything + // TODO: we should not open listening sockets yet + + bool success = false; + + if(mesh->netns != -1) { +#ifdef HAVE_SETNS + pthread_t thr; + + if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) { + void *retval = NULL; + success = pthread_join(thr, &retval) == 0 && retval; + } + +#else + meshlink_errno = MESHLINK_EINTERNAL; + return NULL; + +#endif // HAVE_SETNS + } else { + success = setup_network(mesh); + } + + if(!success) { + meshlink_close(mesh); + meshlink_errno = MESHLINK_ENETWORK; + return NULL; + } + + add_local_addresses(mesh); + + if(!node_write_config(mesh, mesh->self, new_configuration)) { + logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n"); + return NULL; + } + + idle_set(&mesh->loop, idle, mesh); + + logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n"); + return mesh; +} + +meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) { + logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh); + + meshlink_submesh_t *s = NULL; + + if(!mesh) { + logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(!submesh || !*submesh) { + logger(NULL, MESHLINK_ERROR, "No submesh name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + //lock mesh->nodes + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + s = (meshlink_submesh_t *)create_submesh(mesh, submesh); + + pthread_mutex_unlock(&mesh->mutex); + + return s; +} + +static void *meshlink_main_loop(void *arg) { + meshlink_handle_t *mesh = arg; + + if(mesh->netns != -1) { +#ifdef HAVE_SETNS + + if(setns(mesh->netns, CLONE_NEWNET) != 0) { + pthread_cond_signal(&mesh->cond); + return NULL; + } + +#else + pthread_cond_signal(&mesh->cond); + return NULL; +#endif // HAVE_SETNS + } + + if(mesh->discovery.enabled) { + discovery_start(mesh); + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + if(mesh->thread_status_cb) { + mesh->thread_status_cb(mesh, true); + } + + logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n"); + pthread_cond_broadcast(&mesh->cond); + main_loop(mesh); + logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n"); + + if(mesh->thread_status_cb) { + mesh->thread_status_cb(mesh, false); + } + + pthread_mutex_unlock(&mesh->mutex); + + // Stop discovery + if(mesh->discovery.enabled) { + discovery_stop(mesh); + } + + return NULL; +} + +bool meshlink_start(meshlink_handle_t *mesh) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n"); + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + assert(mesh->self); + assert(mesh->private_key); + assert(mesh->self->ecdsa); + assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32)); + + if(mesh->threadstarted) { + logger(mesh, MESHLINK_DEBUG, "thread was already running\n"); + pthread_mutex_unlock(&mesh->mutex); + return true; + } + + if(mesh->listen_socket[0].tcp.fd < 0) { + logger(mesh, MESHLINK_ERROR, "Listening socket not open\n"); + meshlink_errno = MESHLINK_ENETWORK; + return false; + } + + // Reset node connection timers + for splay_each(node_t, n, mesh->nodes) { + n->last_connect_try = 0; + } + + // TODO: open listening sockets first + + //Check that a valid name is set + if(!mesh->name) { + logger(mesh, MESHLINK_ERROR, "No name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + init_outgoings(mesh); + init_adns(mesh); + + // Start the main thread + + event_loop_start(&mesh->loop); + + // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small. + pthread_attr_t attr; + pthread_attr_init(&attr); + pthread_attr_setstacksize(&attr, 1024 * 1024); + + if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) { + logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno)); + memset(&mesh->thread, 0, sizeof(mesh)->thread); + meshlink_errno = MESHLINK_EINTERNAL; + event_loop_stop(&mesh->loop); + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + pthread_cond_wait(&mesh->cond, &mesh->mutex); + mesh->threadstarted = true; + + // Ensure we are considered reachable + graph(mesh); + + pthread_mutex_unlock(&mesh->mutex); + return true; +} + +void meshlink_stop(meshlink_handle_t *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n"); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + // Shut down the main thread + event_loop_stop(&mesh->loop); + + // Send ourselves a UDP packet to kick the event loop + for(int i = 0; i < mesh->listen_sockets; i++) { + sockaddr_t sa; + socklen_t salen = sizeof(sa); + + if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) { + logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno)); + continue; + } + + if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) { + logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno)); + } + } + + if(mesh->threadstarted) { + // Wait for the main thread to finish + pthread_mutex_unlock(&mesh->mutex); + + if(pthread_join(mesh->thread, NULL) != 0) { + abort(); + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->threadstarted = false; + } + + // Close all metaconnections + if(mesh->connections) { + for(list_node_t *node = mesh->connections->head, *next; node; node = next) { + next = node->next; + connection_t *c = node->data; + c->outgoing = NULL; + terminate_connection(mesh, c, false); + } + } + + exit_adns(mesh); + exit_outgoings(mesh); + + // Ensure we are considered unreachable + if(mesh->nodes) { + graph(mesh); + } + + // Try to write out any changed node config files, ignore errors at this point. + if(mesh->nodes) { + for splay_each(node_t, n, mesh->nodes) { + if(n->status.dirty) { + if(!node_write_config(mesh, n, false)) { + // ignore + } + } + } + } + + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_close(meshlink_handle_t *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n"); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + // stop can be called even if mesh has not been started + meshlink_stop(mesh); + + // lock is not released after this + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + // Close and free all resources used. + + close_network_connections(mesh); + + logger(mesh, MESHLINK_INFO, "Terminating"); + + event_loop_exit(&mesh->loop); + +#ifdef HAVE_MINGW + + if(mesh->confbase) { + WSACleanup(); + } + +#endif + + ecdsa_free(mesh->invitation_key); + + if(mesh->netns != -1) { + close(mesh->netns); + } + + for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) { + free(packet); + } + + meshlink_queue_exit(&mesh->outpacketqueue); + + free(mesh->name); + free(mesh->appname); + free(mesh->confbase); + free(mesh->config_key); + free(mesh->external_address_url); + free(mesh->packet); + ecdsa_free(mesh->private_key); + + if(mesh->invitation_addresses) { + list_delete_list(mesh->invitation_addresses); + } + + main_config_unlock(mesh); + + pthread_mutex_unlock(&mesh->mutex); + pthread_mutex_destroy(&mesh->mutex); + + memset(mesh, 0, sizeof(*mesh)); + + free(mesh); +} + +bool meshlink_destroy_ex(const meshlink_open_params_t *params) { + logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n"); + + if(!params) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(!params->confbase) { + /* Ephemeral instances */ + return true; + } + + /* Exit early if the confbase directory itself doesn't exist */ + if(access(params->confbase, F_OK) && errno == ENOENT) { + return true; + } + + /* Take the lock the same way meshlink_open() would. */ + FILE *lockfile = fopen(params->lock_filename, "w+"); + + if(!lockfile) { + logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + return false; + } + +#ifdef FD_CLOEXEC + fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC); +#endif + +#ifdef HAVE_MINGW + // TODO: use _locking()? +#else + + if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) { + logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename); + fclose(lockfile); + meshlink_errno = MESHLINK_EBUSY; + return false; + } + +#endif + + if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) { + logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno)); + return false; + } + + if(unlink(params->lock_filename)) { + logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno)); + fclose(lockfile); + meshlink_errno = MESHLINK_ESTORAGE; + return false; + } + + fclose(lockfile); + + if(!sync_path(params->confbase)) { + logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + return false; + } + + return true; +} + +bool meshlink_destroy(const char *confbase) { + logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase); + + char lock_filename[PATH_MAX]; + snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase); + + meshlink_open_params_t params = { + .confbase = (char *)confbase, + .lock_filename = lock_filename, + }; + + return meshlink_destroy_ex(¶ms); +} + +void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->receive_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->connection_try_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->node_status_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->node_pmtu_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->node_duplicate_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb); + + if(mesh) { + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->log_cb = cb; + mesh->log_level = cb ? level : 0; + pthread_mutex_unlock(&mesh->mutex); + } else { + global_log_cb = cb; + global_log_level = cb ? level : 0; + } +} + +void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->error_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_blacklisted_cb(struct meshlink_handle *mesh, meshlink_blacklisted_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_blacklisted_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->blacklisted_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +void meshlink_set_thread_status_cb(struct meshlink_handle *mesh, meshlink_thread_status_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_thread_status_cb(%p)", (void *)(intptr_t)cb); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + mesh->thread_status_cb = cb; + pthread_mutex_unlock(&mesh->mutex); +} + +static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) { + meshlink_packethdr_t *hdr; + + if(len > MAXSIZE - sizeof(*hdr)) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + node_t *n = (node_t *)destination; + + if(n->status.blacklisted) { + logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name); + meshlink_errno = MESHLINK_EBLACKLISTED; + return false; + } + + // Prepare the packet + packet->probe = false; + packet->tcp = false; + packet->len = len + sizeof(*hdr); + + hdr = (meshlink_packethdr_t *)packet->data; + memset(hdr, 0, sizeof(*hdr)); + // leave the last byte as 0 to make sure strings are always + // null-terminated if they are longer than the buffer + strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1); + strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1); + + memcpy(packet->data + sizeof(*hdr), data, len); + + return true; +} + +static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) { + assert(mesh); + assert(destination); + assert(data); + assert(len); + + // Prepare the packet + if(!prepare_packet(mesh, destination, data, len, mesh->packet)) { + return false; + } + + // Send it immediately + route(mesh, mesh->self, mesh->packet); + + return true; +} + +bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) { + logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len); + + // Validate arguments + if(!mesh || !destination) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(!len) { + return true; + } + + if(!data) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + // Prepare the packet + vpn_packet_t *packet = malloc(sizeof(*packet)); + + if(!packet) { + meshlink_errno = MESHLINK_ENOMEM; + return false; + } + + if(!prepare_packet(mesh, destination, data, len, packet)) { + free(packet); + return false; + } + + // Queue it + if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) { + free(packet); + meshlink_errno = MESHLINK_ENOMEM; + return false; + } + + logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len); + + // Notify event loop + signal_trigger(&mesh->loop, &mesh->datafromapp); + + return true; +} + +void meshlink_send_from_queue(event_loop_t *loop, void *data) { + (void)loop; + meshlink_handle_t *mesh = data; + + logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue"); + + for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) { + logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len); + route(mesh, mesh->self, packet); + free(packet); + } +} + +ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) { + if(!mesh || !destination) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + node_t *n = (node_t *)destination; + + if(!n->status.reachable) { + pthread_mutex_unlock(&mesh->mutex); + return 0; + + } else if(n->mtuprobes > 30 && n->minmtu) { + pthread_mutex_unlock(&mesh->mutex); + return n->minmtu; + } else { + pthread_mutex_unlock(&mesh->mutex); + return MTU; + } +} + +char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + node_t *n = (node_t *)node; + + if(!node_read_public_key(mesh, n) || !n->ecdsa) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa); + + if(!fingerprint) { + meshlink_errno = MESHLINK_EINTERNAL; + } + + pthread_mutex_unlock(&mesh->mutex); + return fingerprint; +} + +meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + return (meshlink_node_t *)mesh->self; +} + +meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) { + if(!mesh || !name) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + node_t *n = NULL; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const + pthread_mutex_unlock(&mesh->mutex); + + if(!n) { + meshlink_errno = MESHLINK_ENOENT; + } + + return (meshlink_node_t *)n; +} + +meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) { + if(!mesh || !name) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + meshlink_submesh_t *submesh = NULL; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name); + pthread_mutex_unlock(&mesh->mutex); + + if(!submesh) { + meshlink_errno = MESHLINK_ENOENT; + } + + return submesh; +} + +meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) { + if(!mesh || !nmemb || (*nmemb && !nodes)) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + meshlink_node_t **result; + + //lock mesh->nodes + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + *nmemb = mesh->nodes->count; + result = realloc(nodes, *nmemb * sizeof(*nodes)); + + if(result) { + meshlink_node_t **p = result; + + for splay_each(node_t, n, mesh->nodes) { + *p++ = (meshlink_node_t *)n; + } + } else { + *nmemb = 0; + free(nodes); + meshlink_errno = MESHLINK_ENOMEM; + } + + pthread_mutex_unlock(&mesh->mutex); + + return result; +} + +static meshlink_node_t **meshlink_get_all_nodes_by_condition(meshlink_handle_t *mesh, const void *condition, meshlink_node_t **nodes, size_t *nmemb, search_node_by_condition_t search_node) { + meshlink_node_t **result; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + *nmemb = 0; + + for splay_each(node_t, n, mesh->nodes) { + if(search_node(n, condition)) { + ++*nmemb; + } + } + + if(*nmemb == 0) { + free(nodes); + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + result = realloc(nodes, *nmemb * sizeof(*nodes)); + + if(result) { + meshlink_node_t **p = result; + + for splay_each(node_t, n, mesh->nodes) { + if(search_node(n, condition)) { + *p++ = (meshlink_node_t *)n; + } + } + } else { + *nmemb = 0; + free(nodes); + meshlink_errno = MESHLINK_ENOMEM; + } + + pthread_mutex_unlock(&mesh->mutex); + + return result; +} + +static bool search_node_by_dev_class(const node_t *node, const void *condition) { + dev_class_t *devclass = (dev_class_t *)condition; + + if(*devclass == (dev_class_t)node->devclass) { + return true; + } + + return false; +} + +static bool search_node_by_blacklisted(const node_t *node, const void *condition) { + return *(bool *)condition == node->status.blacklisted; +} + +static bool search_node_by_submesh(const node_t *node, const void *condition) { + if(condition == node->submesh) { + return true; + } + + return false; +} + +struct time_range { + time_t start; + time_t end; +}; + +static bool search_node_by_last_reachable(const node_t *node, const void *condition) { + const struct time_range *range = condition; + time_t start = node->last_reachable; + time_t end = node->last_unreachable; + + if(end < start) { + end = time(NULL); + + if(end < start) { + start = end; + } + } + + if(range->end >= range->start) { + return start <= range->end && end >= range->start; + } else { + return start > range->start || end < range->end; + } +} + +meshlink_node_t **meshlink_get_all_nodes_by_dev_class(meshlink_handle_t *mesh, dev_class_t devclass, meshlink_node_t **nodes, size_t *nmemb) { + if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class); +} + +meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) { + if(!mesh || !submesh || !nmemb) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh); +} + +meshlink_node_t **meshlink_get_all_nodes_by_last_reachable(meshlink_handle_t *mesh, time_t start, time_t end, meshlink_node_t **nodes, size_t *nmemb) { + if(!mesh || !nmemb) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + struct time_range range = {start, end}; + + return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable); +} + +meshlink_node_t **meshlink_get_all_nodes_by_blacklisted(meshlink_handle_t *mesh, bool blacklisted, meshlink_node_t **nodes, size_t *nmemb) { + if(!mesh || !nmemb) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + return meshlink_get_all_nodes_by_condition(mesh, &blacklisted, nodes, nmemb, search_node_by_blacklisted); +} + +dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + dev_class_t devclass; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + devclass = ((node_t *)node)->devclass; + + pthread_mutex_unlock(&mesh->mutex); + + return devclass; +} + +bool meshlink_get_node_tiny(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + bool tiny; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + tiny = ((node_t *)node)->status.tiny; + + pthread_mutex_unlock(&mesh->mutex); + + return tiny; +} + +bool meshlink_get_node_blacklisted(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + } + + if(!node) { + return mesh->default_blacklist; + } + + bool blacklisted; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + blacklisted = ((node_t *)node)->status.blacklisted; + + pthread_mutex_unlock(&mesh->mutex); + + return blacklisted; +} + +meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + node_t *n = (node_t *)node; + + meshlink_submesh_t *s; + + s = (meshlink_submesh_t *)n->submesh; + + return s; +} + +bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + node_t *n = (node_t *)node; + bool reachable; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + reachable = n->status.reachable && !n->status.blacklisted; + + if(last_reachable) { + *last_reachable = n->last_reachable; + } + + if(last_unreachable) { + *last_unreachable = n->last_unreachable; + } + + pthread_mutex_unlock(&mesh->mutex); + + return reachable; +} + +bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) { + logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen); + + if(!mesh || !data || !len || !signature || !siglen) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(*siglen < MESHLINK_SIGLEN) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + if(!ecdsa_sign(mesh->private_key, data, len, signature)) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + *siglen = MESHLINK_SIGLEN; + pthread_mutex_unlock(&mesh->mutex); + return true; +} + +bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) { + logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen); + + if(!mesh || !source || !data || !len || !signature) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(siglen != MESHLINK_SIGLEN) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + bool rval = false; + + struct node_t *n = (struct node_t *)source; + + if(!node_read_public_key(mesh, n)) { + meshlink_errno = MESHLINK_EINTERNAL; + rval = false; + } else { + rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature); + } + + pthread_mutex_unlock(&mesh->mutex); + return rval; +} + +static bool refresh_invitation_key(meshlink_handle_t *mesh) { + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout); + + if(!count) { + // TODO: Update invitation key if necessary? + } + + pthread_mutex_unlock(&mesh->mutex); + + return mesh->invitation_key; +} + +bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)"); + + if(!mesh || !node || !address) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(!is_valid_hostname(address)) { + logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if((node_t *)node != mesh->self && !port) { + logger(mesh, MESHLINK_ERROR, "Missing port number!"); + meshlink_errno = MESHLINK_EINVAL; + return false; + + } + + if(port && !is_valid_port(port)) { + logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + char *canonical_address; + + xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport); + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + node_t *n = (node_t *)node; + free(n->canonical_address); + n->canonical_address = canonical_address; + + if(!node_write_config(mesh, n, false)) { + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + pthread_mutex_unlock(&mesh->mutex); + + return config_sync(mesh, "current"); +} + +bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) { + logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)"); + + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + node_t *n = (node_t *)node; + free(n->canonical_address); + n->canonical_address = NULL; + + if(!node_write_config(mesh, n, false)) { + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + pthread_mutex_unlock(&mesh->mutex); + + return config_sync(mesh, "current"); +} + +bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) { + logger(mesh, MESHLINK_DEBUG, "meshlink_add_invitation_address(%s, %s)", address ? address : "(null)", port ? port : "(null)"); + + if(!mesh || !address) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(!is_valid_hostname(address)) { + logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s\n", address); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(port && !is_valid_port(port)) { + logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s\n", address); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + char *combo; + + if(port) { + xasprintf(&combo, "%s/%s", address, port); + } else { + combo = xstrdup(address); + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + if(!mesh->invitation_addresses) { + mesh->invitation_addresses = list_alloc((list_action_t)free); + } + + list_insert_tail(mesh->invitation_addresses, combo); + pthread_mutex_unlock(&mesh->mutex); + + return true; +} + +void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_clear_invitation_addresses()"); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + if(mesh->invitation_addresses) { + list_delete_list(mesh->invitation_addresses); + mesh->invitation_addresses = NULL; + } + + pthread_mutex_unlock(&mesh->mutex); +} + +bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) { + logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)"); + + return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL); +} + +bool meshlink_add_external_address(meshlink_handle_t *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()"); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + char *address = meshlink_get_external_address(mesh); + + if(!address) { + return false; + } + + bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL); + free(address); + + return rval; +} + +int meshlink_get_port(meshlink_handle_t *mesh) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + if(!mesh->myport) { + meshlink_errno = MESHLINK_EINTERNAL; + return -1; + } + + int port; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + port = atoi(mesh->myport); + pthread_mutex_unlock(&mesh->mutex); + + return port; +} + +bool meshlink_set_port(meshlink_handle_t *mesh, int port) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_port(%d)", port); + + if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(mesh->myport && port == atoi(mesh->myport)) { + return true; + } + + if(!try_bind(mesh, port)) { + meshlink_errno = MESHLINK_ENETWORK; + return false; + } + + devtool_trybind_probe(); + + bool rval = false; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + if(mesh->threadstarted) { + meshlink_errno = MESHLINK_EINVAL; + goto done; + } + + free(mesh->myport); + xasprintf(&mesh->myport, "%d", port); + + /* Close down the network. This also deletes mesh->self. */ + close_network_connections(mesh); + + /* Recreate mesh->self. */ + mesh->self = new_node(); + mesh->self->name = xstrdup(mesh->name); + mesh->self->devclass = mesh->devclass; + mesh->self->session_id = mesh->session_id; + xasprintf(&mesh->myport, "%d", port); + + if(!node_read_public_key(mesh, mesh->self)) { + logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!"); + meshlink_errno = MESHLINK_ESTORAGE; + free_node(mesh->self); + mesh->self = NULL; + goto done; + } else if(!setup_network(mesh)) { + meshlink_errno = MESHLINK_ENETWORK; + goto done; + } + + /* Rebuild our own list of recent addresses */ + memset(mesh->self->recent, 0, sizeof(mesh->self->recent)); + add_local_addresses(mesh); + + /* Write meshlink.conf with the updated port number */ + write_main_config_files(mesh); + + rval = config_sync(mesh, "current"); + +done: + pthread_mutex_unlock(&mesh->mutex); + + return rval && meshlink_get_port(mesh) == port; +} + +void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) { + logger(mesh, MESHLINK_DEBUG, "meshlink_invitation_timeout(%d)", timeout); + + mesh->invitation_timeout = timeout; +} + +char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) { + logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s, %u)", submesh ? submesh->name : "(null)", name ? name : "(null)", flags); + + meshlink_submesh_t *s = NULL; + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + if(submesh) { + s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name); + + if(s != submesh) { + logger(mesh, MESHLINK_ERROR, "Invalid submesh handle.\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + } else { + s = (meshlink_submesh_t *)mesh->self->submesh; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + // Check validity of the new node's name + if(!check_id(name)) { + logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n"); + meshlink_errno = MESHLINK_EINVAL; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + // Ensure no host configuration file with that name exists + if(config_exists(mesh, "current", name)) { + logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name); + meshlink_errno = MESHLINK_EEXIST; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + // Ensure no other nodes know about this name + if(lookup_node(mesh, name)) { + logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name); + meshlink_errno = MESHLINK_EEXIST; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + // Get the local address + char *address = get_my_hostname(mesh, flags); + + if(!address) { + logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n"); + meshlink_errno = MESHLINK_ERESOLV; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + if(!refresh_invitation_key(mesh)) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + // If we changed our own host config file, write it out now + if(mesh->self->status.dirty) { + if(!node_write_config(mesh, mesh->self, false)) { + logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n"); + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + } + + char hash[64]; + + // Create a hash of the key. + char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key); + sha512(fingerprint, strlen(fingerprint), hash); + b64encode_urlsafe(hash, hash, 18); + + // Create a random cookie for this invitation. + char cookie[25]; + randomize(cookie, 18); + + // Create a filename that doesn't reveal the cookie itself + char buf[18 + strlen(fingerprint)]; + char cookiehash[64]; + memcpy(buf, cookie, 18); + memcpy(buf + 18, fingerprint, sizeof(buf) - 18); + sha512(buf, sizeof(buf), cookiehash); + b64encode_urlsafe(cookiehash, cookiehash, 18); + + b64encode_urlsafe(cookie, cookie, 18); + + free(fingerprint); + + /* Construct the invitation file */ + uint8_t outbuf[4096]; + packmsg_output_t inv = {outbuf, sizeof(outbuf)}; + + packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION); + packmsg_add_str(&inv, name); + packmsg_add_str(&inv, s ? s->name : CORE_MESH); + packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */ + + /* TODO: Add several host config files to bootstrap connections. + * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh, + * and are not blacklisted. + */ + config_t configs[5]; + memset(configs, 0, sizeof(configs)); + int count = 0; + + if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) { + count++; + } + + /* Append host config files to the invitation file */ + packmsg_add_array(&inv, count); + + for(int i = 0; i < count; i++) { + packmsg_add_bin(&inv, configs[i].buf, configs[i].len); + config_free(&configs[i]); + } + + config_t config = {outbuf, packmsg_output_size(&inv, outbuf)}; + + if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) { + logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } + + // Create an URL from the local address, key hash and cookie + char *url; + xasprintf(&url, "%s/%s%s", address, hash, cookie); + free(address); + + pthread_mutex_unlock(&mesh->mutex); + return url; +} + +char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) { + logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s)", submesh ? submesh->name : "(null)", name ? name : "(null)"); + + return meshlink_invite_ex(mesh, submesh, name, 0); +} + +bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { + logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)"); + + if(!mesh || !invitation) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + join_state_t state = { + .mesh = mesh, + .sock = -1, + }; + + ecdsa_t *key = NULL; + ecdsa_t *hiskey = NULL; + + //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL. + char copy[strlen(invitation) + 1]; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + //Before doing meshlink_join make sure we are not connected to another mesh + if(mesh->threadstarted) { + logger(mesh, MESHLINK_ERROR, "Cannot join while started\n"); + meshlink_errno = MESHLINK_EINVAL; + goto exit; + } + + // Refuse to join a mesh if we are already part of one. We are part of one if we know at least one other node. + if(mesh->nodes->count > 1) { + logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n"); + meshlink_errno = MESHLINK_EINVAL; + goto exit; + } + + strcpy(copy, invitation); + + // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie. + + char *slash = strchr(copy, '/'); + + if(!slash) { + goto invalid; + } + + *slash++ = 0; + + if(strlen(slash) != 48) { + goto invalid; + } + + char *address = copy; + char *port = NULL; + + if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) { + goto invalid; + } + + if(mesh->inviter_commits_first) { + memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32); + } + + // Generate a throw-away key for the invitation. + key = ecdsa_generate(); + + if(!key) { + meshlink_errno = MESHLINK_EINTERNAL; + goto exit; + } + + char *b64key = ecdsa_get_base64_public_key(key); + char *comma; + + while(address && *address) { + // We allow commas in the address part to support multiple addresses in one invitation URL. + comma = strchr(address, ','); + + if(comma) { + *comma++ = 0; + } + + // Split of the port + port = strrchr(address, ':'); + + if(!port) { + goto invalid; + } + + *port++ = 0; + + // IPv6 address are enclosed in brackets, per RFC 3986 + if(*address == '[') { + address++; + char *bracket = strchr(address, ']'); + + if(!bracket) { + goto invalid; + } + + *bracket++ = 0; + + if(*bracket) { + goto invalid; + } + } + + // Connect to the meshlink daemon mentioned in the URL. + struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 30); + + if(ai) { + for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) { + state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns); + + if(state.sock == -1) { + logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno)); + meshlink_errno = MESHLINK_ENETWORK; + continue; + } + +#ifdef SO_NOSIGPIPE + int nosigpipe = 1; + setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe)); +#endif + + set_timeout(state.sock, 5000); + + if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) { + logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno)); + meshlink_errno = MESHLINK_ENETWORK; + closesocket(state.sock); + state.sock = -1; + continue; + } + + break; + } + + freeaddrinfo(ai); + } else { + meshlink_errno = MESHLINK_ERESOLV; + } + + if(state.sock != -1 || !comma) { + break; + } + + address = comma; + } + + if(state.sock == -1) { + goto exit; + } + + logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port); + + // Tell him we have an invitation, and give him our throw-away key. + + state.blen = 0; + + if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) { + logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno)); + meshlink_errno = MESHLINK_ENETWORK; + goto exit; + } + + free(b64key); + + char hisname[4096] = ""; + int code, hismajor, hisminor = 0; + + if(!recvline(&state) || sscanf(state.line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(&state) || !rstrip(state.line) || sscanf(state.line, "%d ", &code) != 1 || code != ACK || strlen(state.line) < 3) { + logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n"); + meshlink_errno = MESHLINK_ENETWORK; + goto exit; + } + + // Check if the hash of the key he gave us matches the hash in the URL. + char *fingerprint = state.line + 2; + char hishash[64]; + + if(sha512(fingerprint, strlen(fingerprint), hishash)) { + logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2); + meshlink_errno = MESHLINK_EINTERNAL; + goto exit; + } + + if(memcmp(hishash, state.hash, 18)) { + logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2); + meshlink_errno = MESHLINK_EPEER; + goto exit; + } + + hiskey = ecdsa_set_base64_public_key(fingerprint); + + if(!hiskey) { + meshlink_errno = MESHLINK_EINTERNAL; + goto exit; + } + + // Start an SPTPS session + if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) { + meshlink_errno = MESHLINK_EINTERNAL; + goto exit; + } + + // Feed rest of input buffer to SPTPS + if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) { + meshlink_errno = MESHLINK_EPEER; + goto exit; + } + + ssize_t len; + logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line)); + + while((len = recv(state.sock, state.line, sizeof(state.line), 0))) { + if(len < 0) { + if(errno == EINTR) { + continue; + } + + logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno)); + meshlink_errno = MESHLINK_ENETWORK; + goto exit; + } + + if(!sptps_receive_data(&state.sptps, state.line, len)) { + meshlink_errno = MESHLINK_EPEER; + goto exit; + } + } + + if(!state.success) { + logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n"); + meshlink_errno = MESHLINK_EPEER; + goto exit; + } + + sptps_stop(&state.sptps); + ecdsa_free(hiskey); + ecdsa_free(key); + closesocket(state.sock); + + pthread_mutex_unlock(&mesh->mutex); return true; + +invalid: + logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n"); + meshlink_errno = MESHLINK_EINVAL; +exit: + sptps_stop(&state.sptps); + ecdsa_free(hiskey); + ecdsa_free(key); + + if(state.sock != -1) { + closesocket(state.sock); + } + + pthread_mutex_unlock(&mesh->mutex); + return false; } -void meshlink_stop(meshlink_handle_t *mesh) { +char *meshlink_export(meshlink_handle_t *mesh) { if(!mesh) { meshlink_errno = MESHLINK_EINVAL; - return; + return NULL; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n"); + // Create a config file on the fly. -#if HAVE_CATTA + uint8_t buf[4096]; + packmsg_output_t out = {buf, sizeof(buf)}; + packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION); + packmsg_add_str(&out, mesh->name); + packmsg_add_str(&out, CORE_MESH); - // Stop discovery - if(mesh->discovery) { - discovery_stop(mesh); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } -#endif + packmsg_add_int32(&out, mesh->self->devclass); + packmsg_add_bool(&out, mesh->self->status.blacklisted); + packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32); - // Shut down the main thread - event_loop_stop(&mesh->loop); + if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) { + char *canonical_address = NULL; + xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport); + packmsg_add_str(&out, canonical_address); + free(canonical_address); + } else { + packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : ""); + } - // Send ourselves a UDP packet to kick the event loop - for(int i = 0; i < mesh->listen_sockets; i++) { - sockaddr_t sa; - socklen_t salen = sizeof(sa.sa); + uint32_t count = 0; - if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) { - logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno)); + for(uint32_t i = 0; i < MAX_RECENT; i++) { + if(mesh->self->recent[i].sa.sa_family) { + count++; + } else { + break; + } + } + + packmsg_add_array(&out, count); + + for(uint32_t i = 0; i < count; i++) { + packmsg_add_sockaddr(&out, &mesh->self->recent[i]); + } + + packmsg_add_int64(&out, 0); + packmsg_add_int64(&out, 0); + + pthread_mutex_unlock(&mesh->mutex); + + if(!packmsg_output_ok(&out)) { + logger(mesh, MESHLINK_ERROR, "Error creating export data\n"); + meshlink_errno = MESHLINK_EINTERNAL; + return NULL; + } + + // Prepare a base64-encoded packmsg array containing our config file + + uint32_t len = packmsg_output_size(&out, buf); + uint32_t len2 = ((len + 4) * 4) / 3 + 4; + uint8_t *buf2 = xmalloc(len2); + packmsg_output_t out2 = {buf2, len2}; + packmsg_add_array(&out2, 1); + packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf)); + + if(!packmsg_output_ok(&out2)) { + logger(mesh, MESHLINK_ERROR, "Error creating export data\n"); + meshlink_errno = MESHLINK_EINTERNAL; + free(buf2); + return NULL; + } + + b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2)); + + return (char *)buf2; +} + +bool meshlink_import(meshlink_handle_t *mesh, const char *data) { + logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data); + + if(!mesh || !data) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + size_t datalen = strlen(data); + uint8_t *buf = xmalloc(datalen); + int buflen = b64decode(data, buf, datalen); + + if(!buflen) { + logger(mesh, MESHLINK_ERROR, "Invalid data\n"); + free(buf); + meshlink_errno = MESHLINK_EPEER; + return false; + } + + packmsg_input_t in = {buf, buflen}; + uint32_t count = packmsg_get_array(&in); + + if(!count) { + logger(mesh, MESHLINK_ERROR, "Invalid data\n"); + free(buf); + meshlink_errno = MESHLINK_EPEER; + return false; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } + + while(count--) { + const void *data2; + uint32_t len2 = packmsg_get_bin_raw(&in, &data2); + + if(!len2) { + break; + } + + packmsg_input_t in2 = {data2, len2}; + uint32_t version = packmsg_get_uint32(&in2); + char *name = packmsg_get_str_dup(&in2); + + if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) { + free(name); + packmsg_input_invalidate(&in); + break; + } + + if(!check_id(name)) { + free(name); + break; + } + + node_t *n = lookup_node(mesh, name); + + if(n) { + logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name); + free(name); continue; } - if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) { - logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno)); + n = new_node(); + n->name = name; + + config_t config = {data2, len2}; + + if(!node_read_from_config(mesh, n, &config)) { + free_node(n); + packmsg_input_invalidate(&in); + break; + } + + /* Clear the reachability times, since we ourself have never seen these nodes yet */ + n->last_reachable = 0; + n->last_unreachable = 0; + + if(!node_write_config(mesh, n, true)) { + free_node(n); + free(buf); + return false; } + + node_add(mesh, n); } - if(mesh->threadstarted) { - // Wait for the main thread to finish - pthread_mutex_unlock(&(mesh->mesh_mutex)); - pthread_join(mesh->thread, NULL); - pthread_mutex_lock(&(mesh->mesh_mutex)); + pthread_mutex_unlock(&mesh->mutex); - mesh->threadstarted = false; + free(buf); + + if(!packmsg_done(&in)) { + logger(mesh, MESHLINK_ERROR, "Invalid data\n"); + meshlink_errno = MESHLINK_EPEER; + return false; } - // Close all metaconnections - if(mesh->connections) { - for(list_node_t *node = mesh->connections->head, *next; node; node = next) { - next = node->next; - connection_t *c = node->data; - c->outgoing = NULL; - terminate_connection(mesh, c, false); + if(!config_sync(mesh, "current")) { + return false; + } + + return true; +} + +static bool blacklist(meshlink_handle_t *mesh, node_t *n) { + if(n == mesh->self) { + logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(n->status.blacklisted) { + logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name); + return true; + } + + n->status.blacklisted = true; + + /* Immediately shut down any connections we have with the blacklisted node. + * We can't call terminate_connection(), because we might be called from a callback function. + */ + for list_each(connection_t, c, mesh->connections) { + if(c->node == n) { + if(c->status.active) { + send_error(mesh, c, BLACKLISTED, "blacklisted"); + } + + shutdown(c->socket, SHUT_RDWR); } } - if(mesh->outgoings) { - list_delete_list(mesh->outgoings); - mesh->outgoings = NULL; + utcp_reset_all_connections(n->utcp); + + n->mtu = 0; + n->minmtu = 0; + n->maxmtu = MTU; + n->mtuprobes = 0; + n->status.udp_confirmed = false; + + if(n->status.reachable) { + n->last_unreachable = time(NULL); + } + + /* Graph updates will suppress status updates for blacklisted nodes, so we need to + * manually call the status callback if necessary. + */ + if(n->status.reachable && mesh->node_status_cb) { + mesh->node_status_cb(mesh, (meshlink_node_t *)n, false); } - pthread_mutex_unlock(&(mesh->mesh_mutex)); + /* Remove any outstanding invitations */ + invitation_purge_node(mesh, n->name); + + return node_write_config(mesh, n, true) && config_sync(mesh, "current"); } -void meshlink_close(meshlink_handle_t *mesh) { - if(!mesh || !mesh->confbase) { +bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) { + logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist(%s)", node ? node->name : "(null)"); + + if(!mesh || !node) { meshlink_errno = MESHLINK_EINVAL; - return; + return false; } - // stop can be called even if mesh has not been started - meshlink_stop(mesh); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - // lock is not released after this - pthread_mutex_lock(&(mesh->mesh_mutex)); + if(!blacklist(mesh, (node_t *)node)) { + pthread_mutex_unlock(&mesh->mutex); + return false; + } - // Close and free all resources used. + pthread_mutex_unlock(&mesh->mutex); - close_network_connections(mesh); + logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name); + return true; +} - logger(mesh, MESHLINK_INFO, "Terminating"); +bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) { + logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist_by_name(%s)", name ? name : "(null)"); + + if(!mesh || !name) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - exit_configuration(&mesh->config); - event_loop_exit(&mesh->loop); + node_t *n = lookup_node(mesh, (char *)name); -#ifdef HAVE_MINGW + if(!n) { + n = new_node(); + n->name = xstrdup(name); + node_add(mesh, n); + } - if(mesh->confbase) { - WSACleanup(); + if(!blacklist(mesh, (node_t *)n)) { + pthread_mutex_unlock(&mesh->mutex); + return false; } -#endif + pthread_mutex_unlock(&mesh->mutex); - ecdsa_free(mesh->invitation_key); + logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name); + return true; +} - free(mesh->name); - free(mesh->appname); - free(mesh->confbase); - pthread_mutex_destroy(&(mesh->mesh_mutex)); +static bool whitelist(meshlink_handle_t *mesh, node_t *n) { + if(n == mesh->self) { + logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name); + meshlink_errno = MESHLINK_EINVAL; + return false; + } - if(mesh->conffile) { - fclose(mesh->conffile); - } + if(!n->status.blacklisted) { + logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name); + return true; + } - memset(mesh, 0, sizeof(*mesh)); + n->status.blacklisted = false; - free(mesh); + if(n->status.reachable) { + n->last_reachable = time(NULL); + update_node_status(mesh, n); + } + + return node_write_config(mesh, n, true) && config_sync(mesh, "current"); } -bool meshlink_destroy(const char *confbase) { - if(!confbase) { +bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) { + logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist(%s)", node ? node->name : "(null)"); + + if(!mesh || !node) { meshlink_errno = MESHLINK_EINVAL; return false; } - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - if(unlink(filename)) { - if(errno == ENOENT) { - meshlink_errno = MESHLINK_ENOENT; - return false; - } else { - logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - return false; - } + if(!whitelist(mesh, (node_t *)node)) { + pthread_mutex_unlock(&mesh->mutex); + return false; } - deltree(confbase); + pthread_mutex_unlock(&mesh->mutex); + logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name); return true; } -void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) { - if(!mesh) { +bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) { + logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist_by_name(%s)", name ? name : "(null)"); + + if(!mesh || !name) { meshlink_errno = MESHLINK_EINVAL; - return; + return false; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - mesh->receive_cb = cb; - pthread_mutex_unlock(&(mesh->mesh_mutex)); -} - -void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) { - if(!mesh) { - meshlink_errno = MESHLINK_EINVAL; - return; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - pthread_mutex_lock(&(mesh->mesh_mutex)); - mesh->node_status_cb = cb; - pthread_mutex_unlock(&(mesh->mesh_mutex)); -} + node_t *n = lookup_node(mesh, (char *)name); -void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) { - if(!mesh) { - meshlink_errno = MESHLINK_EINVAL; - return; + if(!n) { + n = new_node(); + n->name = xstrdup(name); + node_add(mesh, n); } - pthread_mutex_lock(&(mesh->mesh_mutex)); - mesh->node_duplicate_cb = cb; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!whitelist(mesh, (node_t *)n)) { + pthread_mutex_unlock(&mesh->mutex); + return false; + } + + pthread_mutex_unlock(&mesh->mutex); + + logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name); + return true; } -void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) { - if(mesh) { - pthread_mutex_lock(&(mesh->mesh_mutex)); - mesh->log_cb = cb; - mesh->log_level = cb ? level : 0; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - } else { - global_log_cb = cb; - global_log_level = cb ? level : 0; - } +void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) { + mesh->default_blacklist = blacklist; } -bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) { - meshlink_packethdr_t *hdr; +bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) { + logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)"); - // Validate arguments - if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) { + if(!mesh || !node) { meshlink_errno = MESHLINK_EINVAL; return false; } - if(!len) { - return true; + node_t *n = (node_t *)node; + + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - if(!data) { - meshlink_errno = MESHLINK_EINVAL; + /* Check that the node is not reachable */ + if(n->status.reachable || n->connection) { + pthread_mutex_unlock(&mesh->mutex); + logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name); return false; } - // Prepare the packet - vpn_packet_t *packet = malloc(sizeof(*packet)); - - if(!packet) { - meshlink_errno = MESHLINK_ENOMEM; + /* Check that we don't have any active UTCP connections */ + if(n->utcp && utcp_is_active(n->utcp)) { + pthread_mutex_unlock(&mesh->mutex); + logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name); return false; } - packet->probe = false; - packet->tcp = false; - packet->len = len + sizeof(*hdr); - - hdr = (meshlink_packethdr_t *)packet->data; - memset(hdr, 0, sizeof(*hdr)); - // leave the last byte as 0 to make sure strings are always - // null-terminated if they are longer than the buffer - strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1); - strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1); + /* Check that we have no active connections to this node */ + for list_each(connection_t, c, mesh->connections) { + if(c->node == n) { + pthread_mutex_unlock(&mesh->mutex); + logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name); + return false; + } + } - memcpy(packet->data + sizeof(*hdr), data, len); + /* Remove any pending outgoings to this node */ + if(mesh->outgoings) { + for list_each(outgoing_t, outgoing, mesh->outgoings) { + if(outgoing->node == n) { + list_delete_node(mesh->outgoings, list_node); + } + } + } - // Queue it - if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) { - free(packet); - meshlink_errno = MESHLINK_ENOMEM; + /* Delete the config file for this node */ + if(!config_delete(mesh, "current", n->name)) { + pthread_mutex_unlock(&mesh->mutex); return false; } - // Notify event loop - signal_trigger(&(mesh->loop), &(mesh->datafromapp)); + /* Delete any pending invitations */ + invitation_purge_node(mesh, n->name); - return true; + /* Delete the node struct and any remaining edges referencing this node */ + node_del(mesh, n); + + pthread_mutex_unlock(&mesh->mutex); + + return config_sync(mesh, "current"); } -void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) { - (void)loop; - vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue); +/* Hint that a hostname may be found at an address + * See header file for detailed comment. + */ +void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) { + logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr); - if(!packet) { + if(!mesh || !node || !addr) { + meshlink_errno = EINVAL; return; } - mesh->self->in_packets++; - mesh->self->in_bytes += packet->len; - route(mesh, mesh->self, packet); -} - -ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) { - if(!mesh || !destination) { - meshlink_errno = MESHLINK_EINVAL; - return -1; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - pthread_mutex_lock(&(mesh->mesh_mutex)); + node_t *n = (node_t *)node; - node_t *n = (node_t *)destination; + if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) { + if(!node_write_config(mesh, n, false)) { + logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name); + } + } - if(!n->status.reachable) { - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return 0; + pthread_mutex_unlock(&mesh->mutex); + // @TODO do we want to fire off a connection attempt right away? +} - } else if(n->mtuprobes > 30 && n->minmtu) { - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return n->minmtu; +static bool channel_pre_accept(struct utcp *utcp, uint16_t port) { + (void)port; + node_t *n = utcp->priv; + meshlink_handle_t *mesh = n->mesh; + + if(mesh->channel_accept_cb && mesh->channel_listen_cb) { + return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port); } else { - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return MTU; + return mesh->channel_accept_cb; } } -char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) { - if(!mesh || !node) { - meshlink_errno = MESHLINK_EINVAL; - return NULL; - } +/* Finish one AIO buffer, return true if the channel is still open. */ +static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) { + meshlink_aio_buffer_t *aio = *head; + *head = aio->next; - pthread_mutex_lock(&(mesh->mesh_mutex)); + if(channel->c) { + channel->in_callback = true; - node_t *n = (node_t *)node; + if(aio->data) { + if(aio->cb.buffer) { + aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv); + } + } else { + if(aio->cb.fd) { + aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv); + } + } - if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + channel->in_callback = false; + + if(!channel->c) { + free(aio); + free(channel); + return false; + } } - char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa); + free(aio); + return true; +} - if(!fingerprint) { - meshlink_errno = MESHLINK_EINTERNAL; +/* Finish all AIO buffers, return true if the channel is still open. */ +static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) { + while(*head) { + if(!aio_finish_one(mesh, channel, head)) { + return false; + } } - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return fingerprint; + return true; } -meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) { - if(!mesh) { - meshlink_errno = MESHLINK_EINVAL; - return NULL; +static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) { + meshlink_channel_t *channel = connection->priv; + + if(!channel) { + abort(); } - return (meshlink_node_t *)mesh->self; -} + node_t *n = channel->node; + meshlink_handle_t *mesh = n->mesh; -meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) { - if(!mesh || !name) { - meshlink_errno = MESHLINK_EINVAL; - return NULL; + if(n->status.destroyed) { + meshlink_channel_close(mesh, channel); + return len; } - meshlink_node_t *node = NULL; + const char *p = data; + size_t left = len; - pthread_mutex_lock(&(mesh->mesh_mutex)); - node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return node; -} + while(channel->aio_receive) { + if(!len) { + /* This receive callback signalled an error, abort all outstanding AIO buffers. */ + if(!aio_abort(mesh, channel, &channel->aio_receive)) { + return len; + } -meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) { - if(!mesh || !nmemb || (*nmemb && !nodes)) { - meshlink_errno = MESHLINK_EINVAL; - return NULL; - } + break; + } - meshlink_node_t **result; + meshlink_aio_buffer_t *aio = channel->aio_receive; + size_t todo = aio->len - aio->done; - //lock mesh->nodes - pthread_mutex_lock(&(mesh->mesh_mutex)); + if(todo > left) { + todo = left; + } - *nmemb = mesh->nodes->count; - result = realloc(nodes, *nmemb * sizeof(*nodes)); + if(aio->data) { + memcpy((char *)aio->data + aio->done, p, todo); + } else { + ssize_t result = write(aio->fd, p, todo); - if(result) { - meshlink_node_t **p = result; + if(result <= 0) { + if(result < 0 && errno == EINTR) { + continue; + } - for splay_each(node_t, n, mesh->nodes) { - *p++ = (meshlink_node_t *)n; + /* Writing to fd failed, cancel just this AIO buffer. */ + logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno)); + + if(!aio_finish_one(mesh, channel, &channel->aio_receive)) { + return len; + } + + continue; + } + + todo = result; + } + + aio->done += todo; + p += todo; + left -= todo; + + if(aio->done == aio->len) { + if(!aio_finish_one(mesh, channel, &channel->aio_receive)) { + return len; + } + } + + if(!left) { + return len; } - } else { - *nmemb = 0; - free(nodes); - meshlink_errno = MESHLINK_ENOMEM; } - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(channel->receive_cb) { + channel->receive_cb(mesh, channel, p, left); + } - return result; + return len; } -bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) { - if(!mesh || !data || !len || !signature || !siglen) { - meshlink_errno = MESHLINK_EINVAL; - return false; +static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) { + node_t *n = utcp_connection->utcp->priv; + + if(!n) { + abort(); + } + + meshlink_handle_t *mesh = n->mesh; + + if(!mesh->channel_accept_cb) { + return; + } + + meshlink_channel_t *channel = xzalloc(sizeof(*channel)); + channel->node = n; + channel->c = utcp_connection; + + if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) { + utcp_accept(utcp_connection, channel_recv, channel); + } else { + free(channel); } +} + +static void channel_retransmit(struct utcp_connection *utcp_connection) { + node_t *n = utcp_connection->utcp->priv; + meshlink_handle_t *mesh = n->mesh; - if(*siglen < MESHLINK_SIGLEN) { - meshlink_errno = MESHLINK_EINVAL; - return false; + if(n->mtuprobes == 31 && n->mtutimeout.cb) { + timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) { + 0, 0 + }); } +} - pthread_mutex_lock(&(mesh->mesh_mutex)); +static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) { + node_t *n = utcp->priv; - if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(n->status.destroyed) { + return -1; } - *siglen = MESHLINK_SIGLEN; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return true; + meshlink_handle_t *mesh = n->mesh; + return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1; } -bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) { - if(!mesh || !data || !len || !signature) { - meshlink_errno = MESHLINK_EINVAL; - return false; - } +void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb); - if(siglen != MESHLINK_SIGLEN) { + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - return false; + return; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - bool rval = false; + channel->receive_cb = cb; +} - struct node_t *n = (struct node_t *)source; - node_read_ecdsa_public_key(mesh, n); +void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) { + (void)mesh; + node_t *n = (node_t *)source; - if(!n->ecdsa) { - meshlink_errno = MESHLINK_EINTERNAL; - rval = false; - } else { - rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature); + if(!n->utcp) { + abort(); } - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return rval; + utcp_recv(n->utcp, data, len); } -static bool refresh_invitation_key(meshlink_handle_t *mesh) { - char filename[PATH_MAX]; - - pthread_mutex_lock(&(mesh->mesh_mutex)); - - snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase); +static void channel_poll(struct utcp_connection *connection, size_t len) { + meshlink_channel_t *channel = connection->priv; - if(mkdir(filename, 0700) && errno != EEXIST) { - logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(!channel) { + abort(); } - // Count the number of valid invitations, clean up old ones - DIR *dir = opendir(filename); - - if(!dir) { - logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + node_t *n = channel->node; + meshlink_handle_t *mesh = n->mesh; - errno = 0; - int count = 0; - struct dirent *ent; - time_t deadline = time(NULL) - 604800; // 1 week in the past + while(channel->aio_send) { + if(!len) { + /* This poll callback signalled an error, abort all outstanding AIO buffers. */ + if(!aio_abort(mesh, channel, &channel->aio_send)) { + return; + } - while((ent = readdir(dir))) { - if(strlen(ent->d_name) != 24) { - continue; + break; } - char invname[PATH_MAX]; - struct stat st; + /* We have at least one AIO buffer. Send as much as possible from the buffers. */ + meshlink_aio_buffer_t *aio = channel->aio_send; + size_t todo = aio->len - aio->done; + ssize_t sent; - if(snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) { - logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name); - continue; + if(todo > len) { + todo = len; } - if(!stat(invname, &st)) { - if(mesh->invitation_key && deadline < st.st_mtime) { - count++; - } else { - unlink(invname); - } + if(aio->data) { + sent = utcp_send(connection, (char *)aio->data + aio->done, todo); } else { - logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno)); - errno = 0; - } - } + /* Limit the amount we read at once to avoid stack overflows */ + if(todo > 65536) { + todo = 65536; + } - if(errno) { - logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno)); - closedir(dir); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + char buf[todo]; + ssize_t result = read(aio->fd, buf, todo); - closedir(dir); + if(result > 0) { + todo = result; + sent = utcp_send(connection, buf, todo); + } else { + if(result < 0 && errno == EINTR) { + continue; + } - snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase); + /* Reading from fd failed, cancel just this AIO buffer. */ + if(result != 0) { + logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno)); + } - // Remove the key if there are no outstanding invitations. - if(!count) { - unlink(filename); + if(!aio_finish_one(mesh, channel, &channel->aio_send)) { + return; + } - if(mesh->invitation_key) { - ecdsa_free(mesh->invitation_key); - mesh->invitation_key = NULL; + continue; + } } - } - - if(mesh->invitation_key) { - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return true; - } - // Create a new key if necessary. - FILE *f = fopen(filename, "rb"); + if(sent != (ssize_t)todo) { + /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */ + if(!aio_abort(mesh, channel, &channel->aio_send)) { + return; + } - if(!f) { - if(errno != ENOENT) { - logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + len = 0; + break; } - mesh->invitation_key = ecdsa_generate(); + aio->done += sent; + len -= sent; - if(!mesh->invitation_key) { - logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n"); - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + /* If we didn't finish this buffer, exit early. */ + if(aio->done < aio->len) { + return; } - f = fopen(filename, "wb"); - - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + /* Signal completion of this buffer, and go to the next one. */ + if(!aio_finish_one(mesh, channel, &channel->aio_send)) { + return; } - chmod(filename, 0600); - ecdsa_write_pem_private_key(mesh->invitation_key, f); - fclose(f); - } else { - mesh->invitation_key = ecdsa_read_pem_private_key(f); - fclose(f); - - if(!mesh->invitation_key) { - logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename); - meshlink_errno = MESHLINK_ESTORAGE; + if(!len) { + return; } } - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return mesh->invitation_key; -} - -bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) { - if(!mesh || !node || !address) { - meshlink_errno = MESHLINK_EINVAL; - return false; + if(channel->poll_cb) { + channel->poll_cb(mesh, channel, len); + } else { + utcp_set_poll_cb(connection, NULL); } +} - if(!is_valid_hostname(address)) { - logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address); - meshlink_errno = MESHLINK_EINVAL; - return false; - } +void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb); - if(port && !is_valid_port(port)) { - logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address); + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - return false; + return; } - char *canonical_address; - - if(port) { - xasprintf(&canonical_address, "%s %s", address, port); - } else { - canonical_address = xstrdup(address); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - pthread_mutex_lock(&(mesh->mesh_mutex)); - bool rval = modify_config_file(mesh, node->name, "CanonicalAddress", canonical_address, 1); - pthread_mutex_unlock(&(mesh->mesh_mutex)); - - free(canonical_address); - return rval; + channel->poll_cb = cb; + utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL); + pthread_mutex_unlock(&mesh->mutex); } -bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) { - return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL); -} +void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb); -bool meshlink_add_external_address(meshlink_handle_t *mesh) { if(!mesh) { meshlink_errno = MESHLINK_EINVAL; - return false; + return; } - char *address = meshlink_get_external_address(mesh); - - if(!address) { - return false; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - bool rval = false; - - pthread_mutex_lock(&(mesh->mesh_mutex)); - rval = append_config_file(mesh, mesh->self->name, "Address", address); - pthread_mutex_unlock(&(mesh->mesh_mutex)); + mesh->channel_listen_cb = cb; - free(address); - return rval; + pthread_mutex_unlock(&mesh->mutex); } -int meshlink_get_port(meshlink_handle_t *mesh) { +void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb); + if(!mesh) { meshlink_errno = MESHLINK_EINVAL; - return -1; + return; } - if(!mesh->myport) { - meshlink_errno = MESHLINK_EINTERNAL; - return -1; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - return atoi(mesh->myport); -} + mesh->channel_accept_cb = cb; -bool meshlink_set_port(meshlink_handle_t *mesh, int port) { - if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) { - meshlink_errno = MESHLINK_EINVAL; - return false; + for splay_each(node_t, n, mesh->nodes) { + if(!n->utcp && n != mesh->self) { + n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); + utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t)); + utcp_set_retransmit_cb(n->utcp, channel_retransmit); + } } - if(mesh->myport && port == atoi(mesh->myport)) { - return true; - } + pthread_mutex_unlock(&mesh->mutex); +} - if(!try_bind(port)) { - meshlink_errno = MESHLINK_ENETWORK; - return false; - } +void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size); - bool rval = false; + meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size); +} - pthread_mutex_lock(&(mesh->mesh_mutex)); +void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size); - if(mesh->threadstarted) { + meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size); +} + +void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size); + + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - goto done; + return; } - close_network_connections(mesh); - exit_configuration(&mesh->config); - - char portstr[10]; - snprintf(portstr, sizeof(portstr), "%d", port); - portstr[sizeof(portstr) - 1] = 0; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - modify_config_file(mesh, mesh->name, "Port", portstr, true); + utcp_set_sndbuf(channel->c, buf, size); + pthread_mutex_unlock(&mesh->mutex); +} - init_configuration(&mesh->config); +void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size); - if(!read_server_config(mesh)) { - meshlink_errno = MESHLINK_ESTORAGE; - } else if(!setup_network(mesh)) { - meshlink_errno = MESHLINK_ENETWORK; - } else { - rval = true; + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return; } -done: - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - return rval; + utcp_set_rcvbuf(channel->c, buf, size); + pthread_mutex_unlock(&mesh->mutex); } -void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) { - mesh->invitation_timeout = timeout; -} +void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags); -char *meshlink_invite_ex(meshlink_handle_t *mesh, const char *name, uint32_t flags) { - if(!mesh) { + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - return NULL; + return; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - // Check validity of the new node's name - if(!check_id(name)) { - logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n"); - meshlink_errno = MESHLINK_EINVAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - // Ensure no host configuration file with that name exists - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); + utcp_set_flags(channel->c, flags); + pthread_mutex_unlock(&mesh->mutex); +} - if(!access(filename, F_OK)) { - logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name); - meshlink_errno = MESHLINK_EEXIST; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; - } +meshlink_channel_t *meshlink_channel_open_ex(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len, uint32_t flags) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu, %u)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len, flags); - // Ensure no other nodes know about this name - if(meshlink_get_node(mesh, name)) { - logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name); - meshlink_errno = MESHLINK_EEXIST; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + if(data && len) { + abort(); // TODO: handle non-NULL data } - // Get the local address - char *address = get_my_hostname(mesh, flags); - - if(!address) { - logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n"); - meshlink_errno = MESHLINK_ERESOLV; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; return NULL; } - if(!refresh_invitation_key(mesh)) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - char hash[64]; - - // Create a hash of the key. - char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key); - sha512(fingerprint, strlen(fingerprint), hash); - b64encode_urlsafe(hash, hash, 18); - - // Create a random cookie for this invitation. - char cookie[25]; - randomize(cookie, 18); - - // Create a filename that doesn't reveal the cookie itself - char buf[18 + strlen(fingerprint)]; - char cookiehash[64]; - memcpy(buf, cookie, 18); - memcpy(buf + 18, fingerprint, sizeof(buf) - 18); - sha512(buf, sizeof(buf), cookiehash); - b64encode_urlsafe(cookiehash, cookiehash, 18); - - b64encode_urlsafe(cookie, cookie, 18); - - free(fingerprint); + node_t *n = (node_t *)node; - // Create a file containing the details of the invitation. - snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash); - int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600); + if(!n->utcp) { + n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); + utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t)); + utcp_set_retransmit_cb(n->utcp, channel_retransmit); - if(!ifd) { - logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + if(!n->utcp) { + meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL; + pthread_mutex_unlock(&mesh->mutex); + return NULL; + } } - FILE *f = fdopen(ifd, "w"); - - if(!f) { - abort(); + if(n->status.blacklisted) { + logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n"); + meshlink_errno = MESHLINK_EBLACKLISTED; + pthread_mutex_unlock(&mesh->mutex); + return NULL; } - // Fill in the details. - fprintf(f, "Name = %s\n", name); - fprintf(f, "ConnectTo = %s\n", mesh->self->name); - - // Copy Broadcast and Mode - snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase); - FILE *tc = fopen(filename, "r"); + meshlink_channel_t *channel = xzalloc(sizeof(*channel)); + channel->node = n; + channel->receive_cb = cb; - if(tc) { - char buf[1024]; + if(data && !len) { + channel->priv = (void *)data; + } - while(fgets(buf, sizeof(buf), tc)) { - if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4])) - || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) { - fputs(buf, f); + channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags); - // Make sure there is a newline character. - if(!strchr(buf, '\n')) { - fputc('\n', f); - } - } - } + pthread_mutex_unlock(&mesh->mutex); - fclose(tc); - } else { - logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!channel->c) { + meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL; + free(channel); return NULL; } - fprintf(f, "#---------------------------------------------------------------#\n"); - fprintf(f, "Name = %s\n", mesh->self->name); - - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name); - fcopy(f, filename); - fclose(f); + return channel; +} - // Create an URL from the local address, key hash and cookie - char *url; - xasprintf(&url, "%s/%s%s", address, hash, cookie); - free(address); +meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len); - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return url; + return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP); } -char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { - return meshlink_invite_ex(mesh, name, 0); -} +void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction); -bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { - if(!mesh || !invitation) { + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - return false; + return; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - //Before doing meshlink_join make sure we are not connected to another mesh - if(mesh->threadstarted) { - logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n"); - meshlink_errno = MESHLINK_EINVAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL. - char copy[strlen(invitation) + 1]; - strcpy(copy, invitation); + utcp_shutdown(channel->c, direction); + pthread_mutex_unlock(&mesh->mutex); +} - // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie. +void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel); - char *slash = strchr(copy, '/'); + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return; + } - if(!slash) { - goto invalid; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - *slash++ = 0; + if(channel->c) { + utcp_close(channel->c); + channel->c = NULL; - if(strlen(slash) != 48) { - goto invalid; + /* Clean up any outstanding AIO buffers. */ + aio_abort(mesh, channel, &channel->aio_send); + aio_abort(mesh, channel, &channel->aio_receive); } - char *address = copy; - char *port = NULL; - - if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) { - goto invalid; + if(!channel->in_callback) { + free(channel); } - // Generate a throw-away key for the invitation. - ecdsa_t *key = ecdsa_generate(); + pthread_mutex_unlock(&mesh->mutex); +} - if(!key) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; +void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel); + + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return; } - char *b64key = ecdsa_get_base64_public_key(key); - char *comma; - mesh->sock = -1; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - while(address && *address) { - // We allow commas in the address part to support multiple addresses in one invitation URL. - comma = strchr(address, ','); + if(channel->c) { + utcp_abort(channel->c); + channel->c = NULL; - if(comma) { - *comma++ = 0; - } + /* Clean up any outstanding AIO buffers. */ + aio_abort(mesh, channel, &channel->aio_send); + aio_abort(mesh, channel, &channel->aio_receive); + } - // Split of the port - port = strrchr(address, ':'); + if(!channel->in_callback) { + free(channel); + } - if(!port) { - goto invalid; - } + pthread_mutex_unlock(&mesh->mutex); +} - *port++ = 0; +ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len); - // IPv6 address are enclosed in brackets, per RFC 3986 - if(*address == '[') { - address++; - char *bracket = strchr(address, ']'); + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } - if(!bracket) { - goto invalid; - } + if(!len) { + return 0; + } - *bracket++ = 0; + if(!data) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } - if(*bracket) { - goto invalid; - } - } + // TODO: more finegrained locking. + // Ideally we want to put the data into the UTCP connection's send buffer. + // Then, preferably only if there is room in the receiver window, + // kick the meshlink thread to go send packets. - // Connect to the meshlink daemon mentioned in the URL. - struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM); + ssize_t retval; - if(ai) { - for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) { - mesh->sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - if(mesh->sock == -1) { - logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno)); - meshlink_errno = MESHLINK_ENETWORK; - continue; - } + /* Disallow direct calls to utcp_send() while we still have AIO active. */ + if(channel->aio_send) { + retval = 0; + } else { + retval = utcp_send(channel->c, data, len); + } - set_timeout(mesh->sock, 5000); + pthread_mutex_unlock(&mesh->mutex); - if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) { - logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno)); - meshlink_errno = MESHLINK_ENETWORK; - closesocket(mesh->sock); - mesh->sock = -1; - continue; - } - } + if(retval < 0) { + meshlink_errno = MESHLINK_ENETWORK; + } - freeaddrinfo(ai); - } else { - meshlink_errno = MESHLINK_ERESOLV; - } + return retval; +} - if(mesh->sock != -1 || !comma) { - break; - } +bool meshlink_channel_aio_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len, meshlink_aio_cb_t cb, void *priv) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv); - address = comma; + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return false; } - if(mesh->sock == -1) { - pthread_mutex_unlock(&mesh->mesh_mutex); + if(!len || !data) { + meshlink_errno = MESHLINK_EINVAL; return false; } - logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port); + meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio)); + aio->data = data; + aio->len = len; + aio->cb.buffer = cb; + aio->priv = priv; - // Tell him we have an invitation, and give him our throw-away key. + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - mesh->blen = 0; + /* Append the AIO buffer descriptor to the end of the chain */ + meshlink_aio_buffer_t **p = &channel->aio_send; - if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, 1, mesh->appname)) { - logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno)); - closesocket(mesh->sock); - meshlink_errno = MESHLINK_ENETWORK; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + while(*p) { + p = &(*p)->next; } - free(b64key); + *p = aio; - char hisname[4096] = ""; - int code, hismajor, hisminor = 0; + /* Ensure the poll callback is set, and call it right now to push data if possible */ + utcp_set_poll_cb(channel->c, channel_poll); + size_t todo = MIN(len, utcp_get_sndbuf_free(channel->c)); - if(!recvline(mesh, sizeof(mesh)->line) || sscanf(mesh->line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(mesh, sizeof(mesh)->line) || !rstrip(mesh->line) || sscanf(mesh->line, "%d ", &code) != 1 || code != ACK || strlen(mesh->line) < 3) { - logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n"); - closesocket(mesh->sock); - meshlink_errno = MESHLINK_ENETWORK; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(todo) { + channel_poll(channel->c, todo); } - // Check if the hash of the key he gave us matches the hash in the URL. - char *fingerprint = mesh->line + 2; - char hishash[64]; + pthread_mutex_unlock(&mesh->mutex); - if(sha512(fingerprint, strlen(fingerprint), hishash)) { - logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2); - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + return true; +} + +bool meshlink_channel_aio_fd_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, int fd, size_t len, meshlink_aio_fd_cb_t cb, void *priv) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv); + + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; return false; } - if(memcmp(hishash, mesh->hash, 18)) { - logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2); - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!len || fd == -1) { + meshlink_errno = MESHLINK_EINVAL; return false; - } - ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint); + meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio)); + aio->fd = fd; + aio->len = len; + aio->cb.fd = cb; + aio->priv = priv; - if(!hiskey) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - // Start an SPTPS session - if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) { - meshlink_errno = MESHLINK_EINTERNAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + /* Append the AIO buffer descriptor to the end of the chain */ + meshlink_aio_buffer_t **p = &channel->aio_send; - // Feed rest of input buffer to SPTPS - if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) { - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + while(*p) { + p = &(*p)->next; } - int len; - - while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) { - if(len < 0) { - if(errno == EINTR) { - continue; - } + *p = aio; - logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno)); - meshlink_errno = MESHLINK_ENETWORK; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + /* Ensure the poll callback is set, and call it right now to push data if possible */ + utcp_set_poll_cb(channel->c, channel_poll); + size_t left = utcp_get_sndbuf_free(channel->c); - if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) { - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + if(left) { + channel_poll(channel->c, left); } - sptps_stop(&mesh->sptps); - ecdsa_free(hiskey); - ecdsa_free(key); - closesocket(mesh->sock); - - if(!mesh->success) { - logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n"); - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; - } + pthread_mutex_unlock(&mesh->mutex); - pthread_mutex_unlock(&(mesh->mesh_mutex)); return true; - -invalid: - logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n"); - meshlink_errno = MESHLINK_EINVAL; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; } -char *meshlink_export(meshlink_handle_t *mesh) { - if(!mesh) { +bool meshlink_channel_aio_receive(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len, meshlink_aio_cb_t cb, void *priv) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv); + + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; - return NULL; + return false; } - pthread_mutex_lock(&(mesh->mesh_mutex)); + if(!len || !data) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name); - FILE *f = fopen(filename, "r"); + meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio)); + aio->data = data; + aio->len = len; + aio->cb.buffer = cb; + aio->priv = priv; - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - fseek(f, 0, SEEK_END); - int fsize = ftell(f); - rewind(f); + /* Append the AIO buffer descriptor to the end of the chain */ + meshlink_aio_buffer_t **p = &channel->aio_receive; - size_t len = fsize + 9 + strlen(mesh->self->name); - char *buf = xmalloc(len); - snprintf(buf, len, "Name = %s\n", mesh->self->name); - - if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) { - logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno)); - fclose(f); - free(buf); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return NULL; + while(*p) { + p = &(*p)->next; } - fclose(f); - buf[len - 1] = 0; + *p = aio; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return buf; + pthread_mutex_unlock(&mesh->mutex); + + return true; } -bool meshlink_import(meshlink_handle_t *mesh, const char *data) { - if(!mesh || !data) { +bool meshlink_channel_aio_fd_receive(meshlink_handle_t *mesh, meshlink_channel_t *channel, int fd, size_t len, meshlink_aio_fd_cb_t cb, void *priv) { + logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv); + + if(!mesh || !channel) { meshlink_errno = MESHLINK_EINVAL; return false; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - if(strncmp(data, "Name = ", 7)) { - logger(mesh, MESHLINK_DEBUG, "Invalid data\n"); - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); + if(!len || fd == -1) { + meshlink_errno = MESHLINK_EINVAL; return false; } - char *end = strchr(data + 7, '\n'); + meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio)); + aio->fd = fd; + aio->len = len; + aio->cb.fd = cb; + aio->priv = priv; - if(!end) { - logger(mesh, MESHLINK_DEBUG, "Invalid data\n"); - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - int len = end - (data + 7); - char name[len + 1]; - memcpy(name, data + 7, len); - name[len] = 0; + /* Append the AIO buffer descriptor to the end of the chain */ + meshlink_aio_buffer_t **p = &channel->aio_receive; - if(!check_id(name)) { - logger(mesh, MESHLINK_DEBUG, "Invalid Name\n"); - meshlink_errno = MESHLINK_EPEER; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + while(*p) { + p = &(*p)->next; } - char filename[PATH_MAX]; - snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); + *p = aio; - if(!access(filename, F_OK)) { - logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename); - meshlink_errno = MESHLINK_EEXIST; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + pthread_mutex_unlock(&mesh->mutex); + + return true; +} + +uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return -1; } - if(errno != ENOENT) { - logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; + return channel->c->flags; +} + +size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + return utcp_get_sendq(channel->c); +} + +size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return -1; } - FILE *f = fopen(filename, "w"); + return utcp_get_recvq(channel->c); +} - if(!f) { - logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno)); - meshlink_errno = MESHLINK_ESTORAGE; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return false; +size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return -1; } - fwrite(end + 1, strlen(end + 1), 1, f); - fclose(f); - - load_all_nodes(mesh); - - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return true; + return utcp_get_mss(channel->node->utcp); } -void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) { +void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout); + if(!mesh || !node) { meshlink_errno = MESHLINK_EINVAL; return; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - node_t *n; - n = (node_t *)node; - n->status.blacklisted = true; - logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name); + node_t *n = (node_t *)node; - //Make blacklisting persistent in the config file - append_config_file(mesh, n->name, "blacklisted", "yes"); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - //Immediately terminate any connections we have with the blacklisted node - for list_each(connection_t, c, mesh->connections) { - if(c->node == n) { - terminate_connection(mesh, c, c->status.active); - } + if(!n->utcp) { + n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); + utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t)); + utcp_set_retransmit_cb(n->utcp, channel_retransmit); } - pthread_mutex_unlock(&(mesh->mesh_mutex)); + utcp_set_user_timeout(n->utcp, timeout); + + pthread_mutex_unlock(&mesh->mutex); } -void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) { - if(!mesh || !node) { - meshlink_errno = MESHLINK_EINVAL; - return; +void update_node_status(meshlink_handle_t *mesh, node_t *n) { + if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) { + n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); + utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t)); + utcp_set_retransmit_cb(n->utcp, channel_retransmit); } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - node_t *n = (node_t *)node; - n->status.blacklisted = false; - - //TODO: remove blacklisted = yes from the config file + if(mesh->node_status_cb) { + mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted); + } - pthread_mutex_unlock(&(mesh->mesh_mutex)); - return; + if(mesh->node_pmtu_cb) { + mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu); + } } -void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) { - mesh->default_blacklist = blacklist; +void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) { + utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t)); + + if(mesh->node_pmtu_cb && !n->status.blacklisted) { + mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu); + } } -/* Hint that a hostname may be found at an address - * See header file for detailed comment. - */ -void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) { - if(!mesh || !node || !addr) { +void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) { + if(!mesh->node_duplicate_cb || n->status.duplicate) { return; } - // Ignore hints about ourself. - if((node_t *)node == mesh->self) { + n->status.duplicate = true; + mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n); +} + +void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) { + logger(mesh, MESHLINK_DEBUG, "meshlink_enable_discovery(%d)", enable); + + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; return; } - pthread_mutex_lock(&(mesh->mesh_mutex)); - - char *host = NULL, *port = NULL, *str = NULL; - sockaddr2str((const sockaddr_t *)addr, &host, &port); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); + } - if(host && port) { - xasprintf(&str, "%s %s", host, port); + if(mesh->discovery.enabled == enable) { + goto end; + } - if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0)) { - modify_config_file(mesh, node->name, "Address", str, 5); + if(mesh->threadstarted) { + if(enable) { + discovery_start(mesh); } else { - logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n"); + discovery_stop(mesh); } } - free(str); - free(host); - free(port); + mesh->discovery.enabled = enable; - pthread_mutex_unlock(&(mesh->mesh_mutex)); - // @TODO do we want to fire off a connection attempt right away? +end: + pthread_mutex_unlock(&mesh->mutex); } -static bool channel_pre_accept(struct utcp *utcp, uint16_t port) { - (void)port; - node_t *n = utcp->priv; - meshlink_handle_t *mesh = n->mesh; - return mesh->channel_accept_cb; -} +void meshlink_hint_network_change(struct meshlink_handle *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()"); -static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) { - meshlink_channel_t *channel = connection->priv; + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } - if(!channel) { + if(pthread_mutex_lock(&mesh->mutex) != 0) { abort(); } - node_t *n = channel->node; - meshlink_handle_t *mesh = n->mesh; + if(mesh->discovery.enabled) { + scan_ifaddrs(mesh); + } - if(n->status.destroyed) { - meshlink_channel_close(mesh, channel); - } else if(channel->receive_cb) { - channel->receive_cb(mesh, channel, data, len); + if(mesh->loop.now.tv_sec > mesh->discovery.last_update + 5) { + mesh->discovery.last_update = mesh->loop.now.tv_sec; + handle_network_change(mesh, 1); } - return len; + pthread_mutex_unlock(&mesh->mutex); } -static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) { - node_t *n = utcp_connection->utcp->priv; +void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout); - if(!n) { - abort(); + if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) { + meshlink_errno = EINVAL; + return; } - meshlink_handle_t *mesh = n->mesh; - - if(!mesh->channel_accept_cb) { + if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) { + meshlink_errno = EINVAL; return; } - meshlink_channel_t *channel = xzalloc(sizeof(*channel)); - channel->node = n; - channel->c = utcp_connection; - - if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) { - utcp_accept(utcp_connection, channel_recv, channel); - } else { - free(channel); + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } + + mesh->dev_class_traits[devclass].pinginterval = pinginterval; + mesh->dev_class_traits[devclass].pingtimeout = pingtimeout; + pthread_mutex_unlock(&mesh->mutex); } -static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) { - node_t *n = utcp->priv; +void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period); - if(n->status.destroyed) { - return -1; + if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) { + meshlink_errno = EINVAL; + return; } - meshlink_handle_t *mesh = n->mesh; - return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1; -} - -void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) { - if(!mesh || !channel) { - meshlink_errno = MESHLINK_EINVAL; + if(fast_retry_period < 0) { + meshlink_errno = EINVAL; return; } - channel->receive_cb = cb; -} - -static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) { - (void)mesh; - node_t *n = (node_t *)source; - - if(!n->utcp) { + if(pthread_mutex_lock(&mesh->mutex) != 0) { abort(); } - utcp_recv(n->utcp, data, len); + mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period; + pthread_mutex_unlock(&mesh->mutex); } -static void channel_poll(struct utcp_connection *connection, size_t len) { - meshlink_channel_t *channel = connection->priv; - - if(!channel) { - abort(); - } - - node_t *n = channel->node; - meshlink_handle_t *mesh = n->mesh; +void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout); - if(channel->poll_cb) { - channel->poll_cb(mesh, channel, len); + if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) { + meshlink_errno = EINVAL; + return; } -} - -void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) { - (void)mesh; - channel->poll_cb = cb; - utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL); -} -void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) { - if(!mesh) { - meshlink_errno = MESHLINK_EINVAL; + if(maxtimeout < 0) { + meshlink_errno = EINVAL; return; } - pthread_mutex_lock(&mesh->mesh_mutex); - mesh->channel_accept_cb = cb; - mesh->receive_cb = channel_receive; - - for splay_each(node_t, n, mesh->nodes) { - if(!n->utcp && n != mesh->self) { - n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); - } + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - pthread_mutex_unlock(&mesh->mesh_mutex); + mesh->dev_class_traits[devclass].maxtimeout = maxtimeout; + pthread_mutex_unlock(&mesh->mutex); } -meshlink_channel_t *meshlink_channel_open_ex(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len, uint32_t flags) { - if(data || len) { - abort(); // TODO: handle non-NULL data - } +void meshlink_reset_timers(struct meshlink_handle *mesh) { + logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()"); - if(!mesh || !node) { - meshlink_errno = MESHLINK_EINVAL; - return NULL; + if(!mesh) { + return; } - node_t *n = (node_t *)node; - - if(!n->utcp) { - n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); - mesh->receive_cb = channel_receive; - - if(!n->utcp) { - meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL; - return NULL; - } + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - meshlink_channel_t *channel = xzalloc(sizeof(*channel)); - channel->node = n; - channel->receive_cb = cb; - channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags); + handle_network_change(mesh, true); - if(!channel->c) { - meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL; - free(channel); - return NULL; + if(mesh->discovery.enabled) { + discovery_refresh(mesh); } - return channel; + pthread_mutex_unlock(&mesh->mutex); } -meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len) { - return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP); -} +void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first); -void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) { - if(!mesh || !channel) { - meshlink_errno = MESHLINK_EINVAL; + if(!mesh) { + meshlink_errno = EINVAL; return; } - utcp_shutdown(channel->c, direction); -} - -void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) { - if(!mesh || !channel) { - meshlink_errno = MESHLINK_EINVAL; - return; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - utcp_close(channel->c); - free(channel); + mesh->inviter_commits_first = inviter_commits_first; + pthread_mutex_unlock(&mesh->mutex); } -ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) { - if(!mesh || !channel) { - meshlink_errno = MESHLINK_EINVAL; - return -1; - } +void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_external_address_discovery_url(%s)", url ? url : "(null)"); - if(!len) { - return 0; + if(!mesh) { + meshlink_errno = EINVAL; + return; } - if(!data) { - meshlink_errno = MESHLINK_EINVAL; - return -1; + if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) { + meshlink_errno = EINVAL; + return; } - // TODO: more finegrained locking. - // Ideally we want to put the data into the UTCP connection's send buffer. - // Then, preferrably only if there is room in the receiver window, - // kick the meshlink thread to go send packets. - - pthread_mutex_lock(&mesh->mesh_mutex); - ssize_t retval = utcp_send(channel->c, data, len); - pthread_mutex_unlock(&mesh->mesh_mutex); - - if(retval < 0) { - meshlink_errno = MESHLINK_ENETWORK; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - return retval; + free(mesh->external_address_url); + mesh->external_address_url = url ? xstrdup(url) : NULL; + pthread_mutex_unlock(&mesh->mutex); } -uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) { - if(!mesh || !channel) { - meshlink_errno = MESHLINK_EINVAL; - return -1; +void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity); + + if(!mesh || granularity < 0) { + meshlink_errno = EINVAL; + return; } - return channel->c->flags; + utcp_set_clock_granularity(granularity); } -void update_node_status(meshlink_handle_t *mesh, node_t *n) { - if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) { - n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); - } +void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) { + logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy); - if(mesh->node_status_cb) { - mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable); + if(!mesh) { + meshlink_errno = EINVAL; + return; } -} -void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) { - if(!mesh->node_duplicate_cb || n->status.duplicate) { - return; + if(pthread_mutex_lock(&mesh->mutex) != 0) { + abort(); } - n->status.duplicate = true; - mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n); + mesh->storage_policy = policy; + pthread_mutex_unlock(&mesh->mutex); } -void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) { -#if HAVE_CATTA +void handle_network_change(meshlink_handle_t *mesh, bool online) { + (void)online; - if(!mesh) { - meshlink_errno = MESHLINK_EINVAL; + if(!mesh->connections || !mesh->loop.running) { return; } - pthread_mutex_lock(&mesh->mesh_mutex); + retry(mesh); + signal_trigger(&mesh->loop, &mesh->datafromapp); +} - if(mesh->discovery == enable) { - goto end; +void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) { + // We should only call the callback function if we are in the background thread. + if(!mesh->error_cb) { + return; } - if(mesh->threadstarted) { - if(enable) { - discovery_start(mesh); - } else { - discovery_stop(mesh); - } + if(!mesh->threadstarted) { + return; } - mesh->discovery = enable; - -end: - pthread_mutex_unlock(&mesh->mesh_mutex); -#else - (void)mesh; - (void)enable; - meshlink_errno = MESHLINK_ENOTSUP; -#endif + if(mesh->thread == pthread_self()) { + mesh->error_cb(mesh, cb_errno); + } } static void __attribute__((constructor)) meshlink_init(void) { crypto_init(); - unsigned int seed; - randomize(&seed, sizeof(seed)); - srand(seed); + utcp_set_clock_granularity(10000); } static void __attribute__((destructor)) meshlink_exit(void) { crypto_exit(); } - -/// Device class traits -dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = { - { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE - { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY - { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE - { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN -};