/*
meshlink.c -- Implementation of the MeshLink API.
- Copyright (C) 2014, 2017 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
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
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 <pthread.h>
+#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"
#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 */
- {"AddressFamily", VAR_SERVER},
- {"AutoConnect", VAR_SERVER | VAR_SAFE},
- {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
- {"BindToInterface", VAR_SERVER},
- {"Broadcast", VAR_SERVER | VAR_SAFE},
- {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
- {"DecrementTTL", VAR_SERVER},
- {"Device", VAR_SERVER},
- {"DeviceType", VAR_SERVER},
- {"DirectOnly", VAR_SERVER},
- {"ECDSAPrivateKeyFile", VAR_SERVER},
- {"ExperimentalProtocol", VAR_SERVER},
- {"Forwarding", VAR_SERVER},
- {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
- {"Hostnames", VAR_SERVER},
- {"IffOneQueue", VAR_SERVER},
- {"Interface", VAR_SERVER},
- {"KeyExpire", VAR_SERVER},
- {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
- {"LocalDiscovery", VAR_SERVER},
- {"MACExpire", VAR_SERVER},
- {"MaxConnectionBurst", VAR_SERVER},
- {"MaxOutputBufferSize", VAR_SERVER},
- {"MaxTimeout", VAR_SERVER},
- {"Mode", VAR_SERVER | VAR_SAFE},
- {"Name", VAR_SERVER},
- {"PingInterval", VAR_SERVER},
- {"PingTimeout", VAR_SERVER},
- {"PriorityInheritance", VAR_SERVER},
- {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
- {"PrivateKeyFile", VAR_SERVER},
- {"ProcessPriority", VAR_SERVER},
- {"Proxy", VAR_SERVER},
- {"ReplayWindow", VAR_SERVER},
- {"ScriptsExtension", VAR_SERVER},
- {"ScriptsInterpreter", VAR_SERVER},
- {"StrictSubnets", VAR_SERVER},
- {"TunnelServer", VAR_SERVER},
- {"VDEGroup", VAR_SERVER},
- {"VDEPort", VAR_SERVER},
- /* Host configuration */
- {"Address", VAR_HOST | VAR_MULTIPLE},
- {"Cipher", VAR_SERVER | VAR_HOST},
- {"ClampMSS", VAR_SERVER | VAR_HOST},
- {"Compression", VAR_SERVER | VAR_HOST},
- {"Digest", VAR_SERVER | VAR_HOST},
- {"ECDSAPublicKey", VAR_HOST},
- {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
- {"IndirectData", VAR_SERVER | VAR_HOST},
- {"MACLength", VAR_SERVER | VAR_HOST},
- {"PMTU", VAR_SERVER | VAR_HOST},
- {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
- {"Port", VAR_HOST},
- {"PublicKey", VAR_HOST | VAR_OBSOLETE},
- {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
- {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
- {"TCPOnly", VAR_SERVER | VAR_HOST},
- {"Weight", VAR_HOST | VAR_SAFE},
- {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);
- while(len && strchr("\t\r\n ", value[len - 1]))
+
+ while(len && strchr("\t\r\n ", value[len - 1])) {
value[--len] = 0;
+ }
+
return len;
}
-static void scan_for_hostname(const char *filename, char **hostname, char **port) {
- char line[4096];
- if(!filename || (*hostname && *port))
- return;
-
- FILE *f = fopen(filename, "r");
- if(!f)
+static void get_canonical_address(node_t *n, char **hostname, char **port) {
+ if(!n->canonical_address) {
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 ");
- *p = 0;
- p = q + strcspn(q, "\t ");
- if(*p)
- *p++ = 0;
- p += strspn(p, "\t ");
- p[strcspn(p, "\t ")] = 0;
-
- if(!*port && !strcasecmp(line, "Port"))
- *port = xstrdup(q);
- else if(!*hostname && !strcasecmp(line, "Address")) {
- *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) {
+ if(!*hostname) {
+ return false;
+ }
+
for(const char *p = hostname; *p; p++) {
- if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':'))
+ if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool is_valid_port(const char *port) {
+ if(!*port) {
+ return false;
+ }
+
+ if(isdigit(*port)) {
+ char *end;
+ unsigned long int result = strtoul(port, &end, 10);
+ return result && result < 65536 && !*end;
+ }
+
+ for(const char *p = port; *p; p++) {
+ if(!(isalnum(*p) || *p == '-')) {
return false;
+ }
}
return true;
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 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_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
+
+ if(sock == -1) {
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
+ closesocket(sock);
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ freeaddrinfo(rai);
+
+ 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(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
+ return false;
+ }
+
+ return true;
+}
+
char *meshlink_get_external_address(meshlink_handle_t *mesh) {
- char *hostname = NULL;
+ return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
+}
+
+char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int 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);
- struct addrinfo *aip = ai;
- 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_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
- while(aip) {
- int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
if(s >= 0) {
set_timeout(s, 5000);
+
if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
closesocket(s);
s = -1;
}
}
+
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) {
line[len] = 0;
- if(line[len - 1] == '\n')
+
+ if(line[len - 1] == '\n') {
line[--len] = 0;
+ }
+
char *p = strrchr(line, '\n');
- if(p && p[1])
+
+ if(p && p[1]) {
hostname = xstrdup(p + 1);
+ }
}
+
closesocket(s);
- if(hostname)
+
+ if(hostname) {
break;
+ }
}
- aip = aip->ai_next;
- continue;
}
- if(ai)
+ if(ai) {
freeaddrinfo(ai);
+ }
// Check that the hostname is reasonable
if(hostname && !is_valid_hostname(hostname)) {
hostname = NULL;
}
- if(!hostname)
+ if(!hostname) {
meshlink_errno = MESHLINK_ERESOLV;
+ }
return hostname;
}
-static char *get_my_hostname(meshlink_handle_t *mesh) {
- char *hostname = NULL;
- char *port = NULL;
- char *hostport = NULL;
- char *name = mesh->self->name;
- char filename[PATH_MAX] = "";
- FILE *f;
+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;
- // Use first Address statement in own host config file
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
- scan_for_hostname(filename, &hostname, &port);
+ 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;
+ }
- if(hostname)
- goto done;
+ default:
+ return false;
+ }
+}
- hostname = meshlink_get_external_address(mesh);
- if(!hostname)
- return NULL;
+char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
+ (void)mesh;
- f = fopen(filename, "a");
- if(f) {
- fprintf(f, "\nAddress = %s\n", hostname);
- fclose(f);
- } else
- logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
+ // Determine address of the local interface used for outgoing connections.
+ char localaddr[NI_MAXHOST];
+ bool success = false;
-done:
- if(port) {
- if(strchr(hostname, ':'))
- xasprintf(&hostport, "[%s]:%s", hostname, port);
- else
- xasprintf(&hostport, "%s:%s", hostname, port);
- } else {
- if(strchr(hostname, ':'))
- xasprintf(&hostport, "[%s]", hostname);
- else
- hostport = xstrdup(hostname);
+ if(family == AF_INET) {
+ 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), mesh->netns);
}
- free(hostname);
- free(port);
- return hostport;
-}
+#ifdef HAVE_GETIFADDRS
-static char *get_line(const char **data) {
- if(!data || !*data)
- return NULL;
+ if(!success) {
+ struct ifaddrs *ifa = NULL;
+ getifaddrs(&ifa);
- if(! **data) {
- *data = NULL;
- return NULL;
- }
+ for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
+ sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
- static char line[1024];
- const char *end = strchr(*data, '\n');
- size_t len = end ? end - *data : strlen(*data);
- if(len >= sizeof(line)) {
- logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
- return NULL;
- }
- if(len && !isprint(**data))
- abort();
+ if(!sa || sa->sa.sa_family != family) {
+ continue;
+ }
- memcpy(line, *data, len);
- line[len] = 0;
+ if(is_localaddr(sa)) {
+ continue;
+ }
- if(end)
- *data = end + 1;
- else
- *data = NULL;
+ if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
+ success = true;
+ break;
+ }
+ }
- return line;
-}
+ freeifaddrs(ifa);
+ }
-static char *get_value(const char *data, const char *var) {
- char *line = get_line(&data);
- if(!line)
- return NULL;
+#endif
- 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))
+ if(!success) {
+ meshlink_errno = MESHLINK_ENETWORK;
return NULL;
- return val;
+ }
+
+ return xstrdup(localaddr);
}
-static bool try_bind(int port) {
- struct addrinfo *ai = NULL;
- struct addrinfo hint = {
- .ai_flags = AI_PASSIVE,
- .ai_family = AF_UNSPEC,
- .ai_socktype = SOCK_STREAM,
- .ai_protocol = IPPROTO_TCP,
- };
+static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
+ for(int i = 0; i < n; i++) {
+ if(!host[i]) {
+ continue;
+ }
- char portstr[16];
- snprintf(portstr, sizeof(portstr), "%d", port);
+ // Ignore duplicate hostnames
+ bool found = false;
- if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
- return false;
+ for(int j = 0; j < i; j++) {
+ if(!host[j]) {
+ continue;
+ }
- while(ai) {
- int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
- if(!fd) {
- freeaddrinfo(ai);
- return false;
+ if(strcmp(host[i], host[j])) {
+ continue;
+ }
+
+ if(strcmp(port[i], port[j])) {
+ continue;
+ }
+
+ found = true;
+ break;
}
- int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
- closesocket(fd);
- if(result) {
- freeaddrinfo(ai);
- return false;
+
+ if(found || !is_valid_hostname(host[i])) {
+ free(host[i]);
+ free(port[i]);
+ host[i] = NULL;
+ port[i] = NULL;
+ continue;
}
- ai = ai->ai_next;
}
-
- freeaddrinfo(ai);
- return true;
}
-static int check_port(meshlink_handle_t *mesh) {
- for(int i = 0; i < 1000; i++) {
- int port = 0x1000 + (rand() & 0x7fff);
- 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) {
- logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
- return 0;
+// This gets the hostname part for use in invitation URLs
+static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
+ 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;
+ }
+
+ if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
+ 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);
}
- fprintf(f, "Port = %d\n", port);
- fclose(f);
- return port;
+ n++;
}
}
- logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
- return 0;
-}
+ // Add local addresses if requested
+ if(flags & MESHLINK_INVITE_LOCAL) {
+ if(flags & MESHLINK_INVITE_IPV4) {
+ hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
+ }
-static bool finalize_join(meshlink_handle_t *mesh) {
- char *name = xstrdup(get_value(mesh->data, "Name"));
- if(!name) {
- logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
- return false;
+ if(flags & MESHLINK_INVITE_IPV6) {
+ hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
+ }
}
- if(!check_id(name)) {
- logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
- return false;
- }
+ // Add public/canonical addresses if requested
+ if(flags & MESHLINK_INVITE_PUBLIC) {
+ // Try the CanonicalAddress first
+ get_canonical_address(mesh->self, &hostname[n], &port[n]);
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
+ if(!hostname[n] && count == 4) {
+ if(flags & MESHLINK_INVITE_IPV4) {
+ hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
+ }
- FILE *f = fopen(filename, "w");
- if(!f) {
- logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
- return false;
+ if(flags & MESHLINK_INVITE_IPV6) {
+ hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
+ }
+ } else {
+ n++;
+ }
}
- fprintf(f, "Name = %s\n", name);
-
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
- FILE *fh = fopen(filename, "w");
- if(!fh) {
- logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
- fclose(f);
- return false;
+ for(int i = 0; i < n; i++) {
+ // Ensure we always have a port number
+ if(hostname[i] && !port[i]) {
+ port[i] = xstrdup(mesh->myport);
+ }
}
- // 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;
+ remove_duplicate_hostnames(hostname, port, n);
- while((l = get_line(&p))) {
- // Ignore comments
- if(*l == '#')
+ // Resolve the hostnames
+ for(int i = 0; i < n; i++) {
+ if(!hostname[i]) {
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 ");
}
- l[len] = 0;
- // Is it a Name?
- if(!strcasecmp(l, "Name"))
- if(strcmp(value, name))
- break;
- else
- continue;
- else if(!strcasecmp(l, "NetName"))
- 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);
- // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
- bool found = false;
- int i;
- for(i = 0; variables[i].name; i++) {
- if(strcasecmp(l, variables[i].name))
- continue;
- found = true;
- break;
+ if(!ai_in) {
+ continue;
}
- // 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;
+ // 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);
}
- // Copy the safe variable to the right config file
- fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
+ freeaddrinfo(ai_in);
+ continue;
}
- fclose(f);
+ // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
+ remove_duplicate_hostnames(hostname, port, n);
- while(l && !strcasecmp(l, "Name")) {
- if(!check_id(value)) {
- logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
- return false;
+ // Concatenate all unique address to the hostport string
+ for(int i = 0; i < n; i++) {
+ if(!hostname[i]) {
+ continue;
}
- if(!strcmp(value, name)) {
- logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
- return false;
- }
+ // 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]);
+ free(hostport);
+ hostport = newhostport;
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
- f = fopen(filename, "w");
+ free(hostname[i]);
+ free(port[i]);
+ }
- if(!f) {
- logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
- return false;
- }
+ return hostport;
+}
- 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(*value == '=') {
- value++;
- value += strspn(value, "\t ");
- }
- l[len] = 0;
+static bool try_bind(meshlink_handle_t *mesh, int port) {
+ struct addrinfo *ai = NULL;
+ struct addrinfo hint = {
+ .ai_flags = AI_PASSIVE,
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ .ai_protocol = IPPROTO_TCP,
+ };
+
+ char portstr[16];
+ snprintf(portstr, sizeof(portstr), "%d", port);
+
+ if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
+ return false;
+ }
+
+ bool success = 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;
}
+ }
+
+ /* If TCP worked, then we require that UDP works as well. */
+
+ int udp_fd = setup_udp_listen_socket(mesh, aip);
+
+ if(udp_fd == -1) {
+ closesocket(tcp_fd);
+ success = false;
+ break;
+ }
+
+ closesocket(tcp_fd);
+ closesocket(udp_fd);
+ success = true;
+ }
+
+ freeaddrinfo(ai);
+ return success;
+}
+
+int check_port(meshlink_handle_t *mesh) {
+ for(int i = 0; i < 1000; i++) {
+ int port = 0x1000 + prng(mesh, 0x8000);
- fputs(l, f);
- fputc('\n', f);
+ if(try_bind(mesh, port)) {
+ free(mesh->myport);
+ xasprintf(&mesh->myport, "%d", port);
+ return port;
}
+ }
+
+ meshlink_errno = MESHLINK_ENETWORK;
+ logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
+ return 0;
+}
+
+static bool write_main_config_files(meshlink_handle_t *mesh) {
+ if(!mesh->confbase) {
+ return true;
+ }
- fclose(f);
+ uint8_t buf[4096];
+
+ /* Write the main config file */
+ packmsg_output_t out = {buf, sizeof buf};
+
+ 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));
+
+ if(!packmsg_output_ok(&out)) {
+ return false;
+ }
+
+ config_t config = {buf, packmsg_output_size(&out, buf)};
+
+ if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
+ return false;
}
- char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
- if(!b64key) {
- fclose(fh);
+ /* Write our own host config file */
+ if(!node_write_config(mesh, mesh->self)) {
return false;
}
- fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
- fprintf(fh, "Port = %s\n", mesh->myport);
+ 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;
- fclose(fh);
+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);
- sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
- free(b64key);
+ if(version != MESHLINK_INVITATION_VERSION) {
+ logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
+ return false;
+ }
+ 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);
+
+ if(!name || !check_id(name)) {
+ logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
+ free(name);
+ free(submesh_name);
+ return false;
+ }
+
+ 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;
+ }
+
+ if(!count) {
+ logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
+ free(name);
+ free(submesh_name);
+ return false;
+ }
+
+ free(mesh->name);
free(mesh->self->name);
- free(mesh->self->connection->name);
+ mesh->name = name;
mesh->self->name = xstrdup(name);
- mesh->self->connection->name = 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;
- logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
+ // Initialize configuration directory
+ if(!config_init(mesh, "current")) {
+ return false;
+ }
+
+ if(!write_main_config_files(mesh)) {
+ return false;
+ }
+
+ // 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);
+
+ if(!data_len) {
+ logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
+ return false;
+ }
+
+ packmsg_input_t in2 = {data, data_len};
+ uint32_t version2 = packmsg_get_uint32(&in2);
+ char *name2 = packmsg_get_str_dup(&in2);
+
+ if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
+ free(name2);
+ packmsg_input_invalidate(&in);
+ break;
+ }
+
+ if(!check_id(name2)) {
+ free(name2);
+ break;
+ }
+
+ if(!strcmp(name2, mesh->name)) {
+ logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
+ free(name2);
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ node_t *n = new_node();
+ n->name = name2;
+
+ config_t config = {data, data_len};
+
+ 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;
+ }
+
+ 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(getpeername(state->sock, &sa.sa, &salen) == 0) {
+ node_add_recent_address(mesh, n, &sa);
+ }
+ }
+
+ /* 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)) {
+ free_node(n);
+ return false;
+ }
- load_all_nodes(mesh);
+ node_add(mesh, n);
+ }
+
+ /* Ensure the configuration directory metadata is on disk */
+ if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
+ return false;
+ }
+
+ if(!mesh->inviter_commits_first) {
+ devtool_set_inviter_commits_first(false);
+ }
+
+ 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);
return true;
}
static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
- meshlink_handle_t *mesh = handle;
+ (void)type;
+ join_state_t *state = handle;
+ const char *ptr = data;
+
while(len) {
- int result = send(mesh->sock, data, len, 0);
- if(result == -1 && errno == EINTR)
+ int result = send(state->sock, ptr, len, 0);
+
+ if(result == -1 && errno == EINTR) {
continue;
- else if(result <= 0)
+ } else if(result <= 0) {
return false;
- data += result;
+ }
+
+ ptr += result;
len -= result;
}
+
return true;
}
static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
- meshlink_handle_t *mesh = handle;
- switch(type) {
- case SPTPS_HANDSHAKE:
- return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
-
- 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 1:
- mesh->thedatalen = 0;
- return finalize_join(mesh);
-
- case 2:
- logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
- shutdown(mesh->sock, SHUT_RDWR);
- mesh->success = true;
- break;
+ join_state_t *state = handle;
+ meshlink_handle_t *mesh = state->mesh;
- default:
- return false;
+ if(mesh->inviter_commits_first) {
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
+
+ case 1:
+ break;
+
+ case 0:
+ if(!finalize_join(state, msg, len)) {
+ return false;
+ }
+
+ logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
+ shutdown(state->sock, SHUT_RDWR);
+ state->success = true;
+ break;
+
+ default:
+ return false;
+ }
+ } else {
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&state->sptps, 0, state->cookie, 18);
+
+ 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(state->buffer, '\n', state->blen))) {
+ int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
- while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
- int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
- if(result == -1 && errno == EINTR)
+ if(result == -1 && errno == EINTR) {
continue;
- else if(result <= 0)
+ } else if(result <= 0) {
return false;
- mesh->blen += result;
+ }
+
+ state->blen += result;
}
- if(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;
blen = vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
- if(blen < 1 || blen >= sizeof(buffer))
+ if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
return false;
+ }
buffer[blen] = '\n';
blen++;
while(blen) {
int result = send(fd, p, blen, MSG_NOSIGNAL);
- if(result == -1 && errno == EINTR)
+
+ if(result == -1 && errno == EINTR) {
continue;
- else if(result <= 0)
+ } else if(result <= 0) {
return false;
+ }
+
p += result;
blen -= result;
}
[MESHLINK_ESTORAGE] = "Storage error",
[MESHLINK_ENETWORK] = "Network error",
[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) {
- if(err < 0 || err >= sizeof(errstr) / sizeof(*errstr))
+ if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
return "Invalid error code";
+ }
+
return errstr[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 keypairs:\n");
- logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
+ mesh->private_key = ecdsa_generate();
+ mesh->invitation_key = ecdsa_generate();
- if(!(key = ecdsa_generate())) {
+ if(!mesh->private_key || !mesh->invitation_key) {
logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
meshlink_errno = MESHLINK_EINTERNAL;
return false;
- } else
- logger(mesh, MESHLINK_DEBUG, "Done.\n");
-
- snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase);
- f = fopen(privname, "wb");
-
- if(!f) {
- meshlink_errno = MESHLINK_ESTORAGE;
- return false;
- }
-
-#ifdef HAVE_FCHMOD
- fchmod(fileno(f), 0600);
-#endif
-
- if(!ecdsa_write_pem_private_key(key, f)) {
- logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
- ecdsa_free(key);
- fclose(f);
- 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)
+ if(!n->utcp) {
continue;
+ }
+
t = utcp_timeout(n->utcp);
- if(timercmp(&t, &tmin, <))
+
+ if(timespec_lt(&t, &tmin)) {
tmin = t;
+ }
}
+
return tmin;
}
-// 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) {
- struct addrinfo *rai = NULL;
- const struct addrinfo hint = {
- .ai_family = AF_UNSPEC,
- .ai_socktype = SOCK_DGRAM,
- .ai_protocol = IPPROTO_UDP,
- };
+// Get our local address(es) by simulating connecting to an Internet host.
+static void add_local_addresses(meshlink_handle_t *mesh) {
+ sockaddr_t sa;
+ sa.storage.ss_family = AF_UNKNOWN;
+ socklen_t salen = sizeof(sa);
- if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai)
- return false;
+ // IPv4 example.org
- int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
- if(sock == -1) {
- freeaddrinfo(rai);
- return false;
+ 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);
}
- if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
- freeaddrinfo(rai);
- return false;
- }
+ // IPv6 example.org
- freeaddrinfo(rai);
+ salen = sizeof(sa);
- struct sockaddr_storage sn;
- socklen_t sl = sizeof(sn);
+ 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);
+ }
+}
- if(getsockname(sock, (struct sockaddr *)&sn, &sl))
+static bool meshlink_setup(meshlink_handle_t *mesh) {
+ 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;
+ }
- if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV))
+ 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;
+ }
- return true;
-}
-
-// 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];
+ 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;
+ }
- // IPv4 example.org
+ if(!ecdsa_keygen(mesh)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
- 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(check_port(mesh) == 0) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
}
- // IPv6 example.org
+ /* Create a node for ourself */
- 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);
- }
-}
+ 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;
-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(!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;
}
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
+ /* Ensure the configuration directory metadata is on disk */
+ if(!config_sync(mesh, "current")) {
+ return false;
+ }
+
+ return true;
+}
- if(mkdir(filename, 0777) && errno != EEXIST) {
- logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
- meshlink_errno = MESHLINK_ESTORAGE;
+static bool meshlink_read_config(meshlink_handle_t *mesh) {
+ config_t config;
+
+ if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
+ logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
return false;
}
- snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
+ packmsg_input_t in = {config.buf, config.len};
+ const void *private_key;
+ const void *invitation_key;
- if(!access(filename, F_OK)) {
- logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
- meshlink_errno = MESHLINK_EEXIST;
+ 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;
}
- FILE *f = fopen(filename, "w");
- if(!f) {
- logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
+ 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;
}
- fprintf(f, "Name = %s\n", mesh->name);
- fclose(f);
+ 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 */
- if(!ecdsa_keygen(mesh)) {
- meshlink_errno = MESHLINK_EINTERNAL;
+ 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;
}
- check_port(mesh);
-
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;
- logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
+ if(setns(mesh->netns, CLONE_NEWNET) != 0) {
+ return NULL;
+ }
+
+ bool success = setup_network(mesh);
+ return success ? arg : NULL;
+}
+#endif // HAVE_SETNS
+meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
if(!confbase || !*confbase) {
logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
meshlink_errno = MESHLINK_EINVAL;
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(strchr(appname, ' ')) {
+ logger(NULL, MESHLINK_ERROR, "Invalid appname 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;
- } else
- usingname = true;
+ if(name && !check_id(name)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
}
- if(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;
- 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);
-
- mesh->threadstarted = false;
- event_loop_init(&mesh->loop);
- mesh->loop.data = mesh;
+ meshlink_open_params_t *params = xzalloc(sizeof * params);
- // Check whether meshlink.conf already exists
+ params->confbase = xstrdup(confbase);
+ params->name = name ? xstrdup(name) : NULL;
+ params->appname = xstrdup(appname);
+ params->devclass = devclass;
+ params->netns = -1;
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
+ return params;
+}
- 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;
- }
+bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
+ if(!params) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
}
- // 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;
- WSAStartup(MAKEWORD(2, 2), &wsa_state);
-#endif
+ params->netns = netns;
- // Setup up everything
- // TODO: we should not open listening sockets yet
+ return true;
+}
- if(!setup_network(mesh)) {
- meshlink_close(mesh);
- meshlink_errno = MESHLINK_ENETWORK;
- return NULL;
+bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
+ if(!params) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
}
- add_local_addresses(mesh);
+ if((!key && keylen) || (key && !keylen)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
- idle_set(&mesh->loop, idle, mesh);
+ params->key = key;
+ params->keylen = keylen;
- logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
- return mesh;
+ return true;
}
-static void *meshlink_main_loop(void *arg) {
- meshlink_handle_t *mesh = arg;
+bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
+ if(!mesh || !new_key || !new_keylen) {
+ logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- try_outgoing_connections(mesh);
+ // Create hash for the new key
+ void *new_config_key;
+ new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
- logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
- main_loop(mesh);
- logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
+ 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;
+ }
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return NULL;
-}
+ // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
-bool meshlink_start(meshlink_handle_t *mesh) {
- if(!mesh) {
- meshlink_errno = MESHLINK_EINVAL;
+ 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;
}
- logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
-
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ devtool_keyrotate_probe(1);
- if(mesh->threadstarted) {
- logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return true;
- }
+ // Rename confbase/current/ to confbase/old
- if(mesh->listen_socket[0].tcp.fd < 0) {
- logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
- meshlink_errno = MESHLINK_ENETWORK;
+ 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;
}
- mesh->thedatalen = 0;
+ devtool_keyrotate_probe(2);
- // TODO: open listening sockets first
+ // Rename confbase/new/ to confbase/current
- //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, "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;
}
- // Start the main thread
+ devtool_keyrotate_probe(3);
- event_loop_start(&mesh->loop);
+ // Cleanup the "old" confbase sub-directory
- 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;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ if(!config_destroy(mesh->confbase, "old")) {
+ pthread_mutex_unlock(&mesh->mutex);
return false;
}
- mesh->threadstarted = true;
+ // Change the mesh handle key with new key
- if(mesh->discovery)
- discovery_start(mesh);
+ free(mesh->config_key);
+ mesh->config_key = new_config_key;
+
+ pthread_mutex_unlock(&mesh->mutex);
- pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
-void meshlink_stop(meshlink_handle_t *mesh) {
- if(!mesh) {
+void meshlink_open_params_free(meshlink_open_params_t *params) {
+ if(!params) {
meshlink_errno = MESHLINK_EINVAL;
return;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
- logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
-
- // Stop discovery
- if(mesh->discovery)
- discovery_stop(mesh);
-
- // Shut down the main thread
- event_loop_stop(&mesh->loop);
-
- // Send ourselves a UDP packet to kick the event loop
- listen_socket_t *s = &mesh->listen_socket[0];
- if(sendto(s->udp.fd, "", 1, MSG_NOSIGNAL, &s->sa.sa, SALEN(s->sa.sa)) == -1)
- logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself");
+ free(params->confbase);
+ free(params->name);
+ free(params->appname);
- // Wait for the main thread to finish
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- pthread_join(mesh->thread, NULL);
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ free(params);
+}
- mesh->threadstarted = false;
+/// 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
+};
- // 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);
- }
+meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
+ if(!confbase || !*confbase) {
+ logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
}
- if(mesh->outgoings)
- list_delete_list(mesh->outgoings);
- mesh->outgoings = NULL;
+ /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
+ meshlink_open_params_t params;
+ memset(¶ms, 0, sizeof(params));
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ params.confbase = (char *)confbase;
+ params.name = (char *)name;
+ params.appname = (char *)appname;
+ params.devclass = devclass;
+ params.netns = -1;
+
+ return meshlink_open_ex(¶ms);
}
-void meshlink_close(meshlink_handle_t *mesh) {
- if(!mesh || !mesh->confbase) {
+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) {
+ if(!confbase || !*confbase) {
+ logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return;
+ return NULL;
}
- // stop can be called even if mesh has not been started
- meshlink_stop(mesh);
-
- // lock is not released after this
- pthread_mutex_lock(&(mesh->mesh_mutex));
-
- // Close and free all resources used.
-
- close_network_connections(mesh);
-
- logger(mesh, MESHLINK_INFO, "Terminating");
-
- exit_configuration(&mesh->config);
- event_loop_exit(&mesh->loop);
-
-#ifdef HAVE_MINGW
- if(mesh->confbase)
- WSACleanup();
-#endif
-
- ecdsa_free(mesh->invitation_key);
+ /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
+ meshlink_open_params_t params;
+ memset(¶ms, 0, sizeof(params));
- free(mesh->name);
- free(mesh->appname);
- free(mesh->confbase);
- pthread_mutex_destroy(&(mesh->mesh_mutex));
+ params.confbase = (char *)confbase;
+ params.name = (char *)name;
+ params.appname = (char *)appname;
+ params.devclass = devclass;
+ params.netns = -1;
- memset(mesh, 0, sizeof(*mesh));
+ if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
+ return false;
+ }
- free(mesh);
+ return meshlink_open_ex(¶ms);
}
-static void deltree(const char *dirname) {
- DIR *d = opendir(dirname);
- if(d) {
- struct dirent *ent;
- while((ent = readdir(d))) {
- if(ent->d_name[0] == '.')
- continue;
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
- if(unlink(filename))
- deltree(filename);
- }
- closedir(d);
+meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
+ if(!name) {
+ logger(NULL, MESHLINK_ERROR, "No name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
}
- rmdir(dirname);
- return;
-}
-bool meshlink_destroy(const char *confbase) {
- if(!confbase) {
+ if(!check_id(name)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return false;
+ return NULL;
}
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
-
- 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(!appname || !*appname) {
+ logger(NULL, MESHLINK_ERROR, "No appname given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
}
- deltree(confbase);
-
- return true;
-}
-
-void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
- if(!mesh) {
+ if(strchr(appname, ' ')) {
+ logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return;
+ return NULL;
}
- 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) {
+ if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
+ logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return;
+ return NULL;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
- mesh->node_status_cb = cb;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
-}
+ /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
+ meshlink_open_params_t params;
+ memset(¶ms, 0, sizeof(params));
-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;
- }
+ params.name = (char *)name;
+ params.appname = (char *)appname;
+ params.devclass = devclass;
+ params.netns = -1;
+
+ return meshlink_open_ex(¶ms);
}
-bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
- meshlink_packethdr_t *hdr;
+meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
+ logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
- // Validate arguments
- if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
+ // Validate arguments provided by the application
+ if(!params->appname || !*params->appname) {
+ logger(NULL, MESHLINK_ERROR, "No appname given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return false;
+ return NULL;
}
- if(!len)
- return true;
-
- if(!data) {
+ if(strchr(params->appname, ' ')) {
+ logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
meshlink_errno = MESHLINK_EINVAL;
- return false;
+ return NULL;
}
- // Prepare the packet
- vpn_packet_t *packet = malloc(sizeof(*packet));
- if(!packet) {
- meshlink_errno = MESHLINK_ENOMEM;
- return false;
+ if(params->name && !check_id(params->name)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
}
- packet->probe = false;
- packet->tcp = false;
- packet->len = len + sizeof(*hdr);
+ if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
+ logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
- 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(hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
- strncpy(hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
+ if((params->key && !params->keylen) || (!params->key && params->keylen)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
- memcpy(packet->data + sizeof(*hdr), data, len);
+ meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
- // Queue it
- if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
- free(packet);
- meshlink_errno = MESHLINK_ENOMEM;
- return false;
+ if(params->confbase) {
+ mesh->confbase = xstrdup(params->confbase);
}
- // Notify event loop
- signal_trigger(&(mesh->loop), &(mesh->datafromapp));
+ mesh->appname = xstrdup(params->appname);
+ mesh->devclass = params->devclass;
+ mesh->discovery = 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));
- return true;
-}
+ randomize(&mesh->prng_state, sizeof(mesh->prng_state));
-void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
- vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
- if(!packet)
- return;
+ do {
+ randomize(&mesh->session_id, sizeof(mesh->session_id));
+ } while(mesh->session_id == 0);
- mesh->self->in_packets++;
- mesh->self->in_bytes += packet->len;
- route(mesh, mesh->self, packet);
-}
+ memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
-ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
- if(!mesh || !destination) {
- meshlink_errno = MESHLINK_EINVAL;
- return -1;
- }
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->name = params->name ? xstrdup(params->name) : NULL;
- node_t *n = (node_t *)destination;
- if(!n->status.reachable) {
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return 0;
+ // Hash the key
+ if(params->key) {
+ mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
- } else if(n->mtuprobes > 30 && n->minmtu) {
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return n->minmtu;
- } else {
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return MTU;
+ 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;
+ }
}
-}
-char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
- if(!mesh || !node) {
- meshlink_errno = MESHLINK_EINVAL;
+ // 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_mutex_init(&mesh->discovery_mutex, NULL);
+ pthread_cond_init(&mesh->discovery_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)) {
+ meshlink_close(mesh);
return NULL;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
- node_t *n = (node_t *)node;
+ // If no configuration exists yet, create it.
- if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
- meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return 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;
+ }
+ } else {
+ if(!meshlink_read_config(mesh)) {
+ logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
+ meshlink_close(mesh);
+ return NULL;
+ }
}
- char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
+#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;
+ }
- if(!fingerprint)
+#else
meshlink_errno = MESHLINK_EINTERNAL;
+ return NULL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return fingerprint;
+#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)) {
+ 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_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
+meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
+ meshlink_submesh_t *s = NULL;
+
if(!mesh) {
+ logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
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) {
+ if(!submesh || !*submesh) {
+ logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
meshlink_errno = MESHLINK_EINVAL;
return NULL;
}
- meshlink_node_t *node = 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);
- 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;
+ return s;
}
-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;
+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
}
- meshlink_node_t **result;
+#if HAVE_CATTA
- //lock mesh->nodes
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ if(mesh->discovery) {
+ discovery_start(mesh);
+ }
- *nmemb = mesh->nodes->count;
- result = realloc(nodes, *nmemb * sizeof(*nodes));
+#endif
- 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;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
+ pthread_cond_broadcast(&mesh->cond);
+ main_loop(mesh);
+ logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
- return result;
-}
+ pthread_mutex_unlock(&mesh->mutex);
-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;
+#if HAVE_CATTA
+
+ // Stop discovery
+ if(mesh->discovery) {
+ discovery_stop(mesh);
}
- if(*siglen < MESHLINK_SIGLEN) {
+#endif
+
+ return NULL;
+}
+
+bool meshlink_start(meshlink_handle_t *mesh) {
+ if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return false;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
- if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
- meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return false;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- *siglen = MESHLINK_SIGLEN;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return true;
-}
+ 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));
-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;
+ 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;
}
- if(siglen != MESHLINK_SIGLEN) {
+ // TODO: open listening sockets first
+
+ //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->mutex);
return false;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
-
- bool rval = false;
+ init_outgoings(mesh);
+ init_adns(mesh);
- struct node_t *n = (struct node_t *)source;
- node_read_ecdsa_public_key(mesh, n);
- if(!n->ecdsa) {
- meshlink_errno = MESHLINK_EINTERNAL;
- rval = false;
- } else
- rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return rval;
-}
+ // Start the main thread
-static bool refresh_invitation_key(meshlink_handle_t *mesh) {
- char filename[PATH_MAX];
+ event_loop_start(&mesh->loop);
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ // 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);
- snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
- 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));
+ if(pthread_create(&mesh->thread, &attr, 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->mutex);
return false;
}
- // 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;
- }
+ pthread_cond_wait(&mesh->cond, &mesh->mutex);
+ mesh->threadstarted = true;
- errno = 0;
- int count = 0;
- struct dirent *ent;
- time_t deadline = time(NULL) - 604800; // 1 week in the past
+ // Ensure we are considered reachable
+ graph(mesh);
- while((ent = readdir(dir))) {
- if(strlen(ent->d_name) != 24)
- continue;
- char invname[PATH_MAX];
- struct stat st;
- snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name);
- if(!stat(invname, &st)) {
- if(mesh->invitation_key && deadline < st.st_mtime)
- count++;
- else
- unlink(invname);
- } else {
- logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
- errno = 0;
- }
+ pthread_mutex_unlock(&mesh->mutex);
+ return true;
+}
+
+void meshlink_stop(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
}
- 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;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- closedir(dir);
+ logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
+
+ // Shut down the main thread
+ event_loop_stop(&mesh->loop);
- snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
+ // 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);
- // Remove the key if there are no outstanding invitations.
- if(!count) {
- unlink(filename);
- if(mesh->invitation_key) {
- ecdsa_free(mesh->invitation_key);
- mesh->invitation_key = NULL;
+ 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(mesh->invitation_key) {
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return true;
+ 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));
+ }
}
- // Create a new key if necessary.
- FILE *f = fopen(filename, "rb");
- 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;
- }
+ if(mesh->threadstarted) {
+ // Wait for the main thread to finish
+ pthread_mutex_unlock(&mesh->mutex);
- mesh->invitation_key = ecdsa_generate();
- 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(pthread_join(mesh->thread, NULL) != 0) {
+ abort();
}
- 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;
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- 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;
+
+ 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);
}
}
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return mesh->invitation_key;
-}
+ exit_adns(mesh);
+ exit_outgoings(mesh);
-bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
- if(!mesh || !address) {
- meshlink_errno = MESHLINK_EINVAL;
- return false;
+ // Ensure we are considered unreachable
+ if(mesh->nodes) {
+ graph(mesh);
}
- if(!is_valid_hostname(address)) {
- logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
- meshlink_errno = MESHLINK_EINVAL;
- return false;
+ // 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) {
+ n->status.dirty = !node_write_config(mesh, n);
+ }
+ }
}
- 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));
-
- return rval;
+ pthread_mutex_unlock(&mesh->mutex);
}
-bool meshlink_add_external_address(meshlink_handle_t *mesh) {
+void meshlink_close(meshlink_handle_t *mesh) {
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
- return false;
+ return;
}
- char *address = meshlink_get_external_address(mesh);
- if(!address)
- return false;
+ // stop can be called even if mesh has not been started
+ meshlink_stop(mesh);
- bool rval = false;
+ // lock is not released after this
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- pthread_mutex_lock(&(mesh->mesh_mutex));
- rval = append_config_file(mesh, mesh->self->name, "Address", address);
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ // Close and free all resources used.
- free(address);
- return rval;
-}
+ close_network_connections(mesh);
-int meshlink_get_port(meshlink_handle_t *mesh) {
- if(!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(const char *confbase) {
+ if(!confbase) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ /* Exit early if the confbase directory itself doesn't exist */
+ if(access(confbase, F_OK) && errno == ENOENT) {
+ return true;
+ }
+
+ /* Take the lock the same way meshlink_open() would. */
+ char lockfilename[PATH_MAX];
+ snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
+
+ FILE *lockfile = fopen(lockfilename, "w+");
+
+ if(!lockfile) {
+ logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, 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", lockfilename);
+ fclose(lockfile);
+ meshlink_errno = MESHLINK_EBUSY;
+ return false;
+ }
+
+#endif
+
+ if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
+ logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
+ return false;
+ }
+
+ if(unlink(lockfilename)) {
+ logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
+ fclose(lockfile);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ fclose(lockfile);
+
+ if(!sync_path(confbase)) {
+ logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ return true;
+}
+
+void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_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) {
+ 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) {
+ 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) {
+ 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) {
+ 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) {
+ 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) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ mesh->error_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) {
+ // 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);
+ mesh->self->in_packets++;
+ mesh->self->in_bytes += 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_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);
+}
+
+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;
+}
+
+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) {
+ 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) {
+ 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) {
+ if(!mesh || !node || !address) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!is_valid_hostname(address)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if((node_t *)node != mesh->self && !port) {
+ logger(mesh, MESHLINK_DEBUG, "Missing port number!");
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+
+ }
+
+ if(port && !is_valid_port(port)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ 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();
+ }
+
+ node_t *n = (node_t *)node;
+ free(n->canonical_address);
+ n->canonical_address = canonical_address;
+
+ if(!node_write_config(mesh, n)) {
+ 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) {
+ if(!mesh || !address) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!is_valid_hostname(address)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(port && !is_valid_port(port)) {
+ logger(mesh, MESHLINK_DEBUG, "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) {
+ 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) {
+ return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
+}
+
+bool meshlink_add_external_address(meshlink_handle_t *mesh) {
+ 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) {
+ 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) {
+ mesh->invitation_timeout = timeout;
+}
+
+char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t 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_DEBUG, "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)) {
+ 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) {
+ return meshlink_invite_ex(mesh, submesh, name, 0);
+}
+
+bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
+ if(!mesh || !invitation) {
+ 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, 5);
+
+ 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_DEBUG, "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_DEBUG, "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_DEBUG, "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_DEBUG, "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_DEBUG, "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_DEBUG, "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_DEBUG, "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;
+}
+
+char *meshlink_export(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ // Create a config file on the fly.
+
+ 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);
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ 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);
+
+ 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 : "");
+ }
+
+ uint32_t count = 0;
+
+ 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_DEBUG, "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_DEBUG, "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) {
+ 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_DEBUG, "Invalid data\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return false;
+ }
+
+ packmsg_input_t in = {buf, buflen};
+ uint32_t count = packmsg_get_array(&in);
+
+ if(!count) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
+ 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;
+ }
+
+ 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)) {
+ free_node(n);
+ return false;
+ }
+
+ node_add(mesh, n);
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
+
+ free(buf);
+
+ if(!packmsg_done(&in)) {
+ logger(mesh, MESHLINK_ERROR, "Invalid data\n");
+ meshlink_errno = MESHLINK_EPEER;
+ return 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) {
+ shutdown(c->socket, SHUT_RDWR);
+ }
+ }
+
+ utcp_abort_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);
+ }
+
+ return node_write_config(mesh, n) && config_sync(mesh, "current");
+}
+
+bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ if(!blacklist(mesh, (node_t *)node)) {
+ pthread_mutex_unlock(&mesh->mutex);
+ return false;
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
+
+ logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
+ return true;
+}
+
+bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
+ if(!mesh || !name) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ node_t *n = lookup_node(mesh, (char *)name);
+
+ if(!n) {
+ n = new_node();
+ n->name = xstrdup(name);
+ node_add(mesh, n);
+ }
+
+ if(!blacklist(mesh, (node_t *)n)) {
+ pthread_mutex_unlock(&mesh->mutex);
+ return false;
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
+
+ logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
+ return true;
+}
+
+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(!n->status.blacklisted) {
+ logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
+ return true;
+ }
+
+ n->status.blacklisted = false;
+
+ if(n->status.reachable) {
+ n->last_reachable = time(NULL);
+ update_node_status(mesh, n);
+ }
+
+ return node_write_config(mesh, n) && config_sync(mesh, "current");
+}
+
+bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ if(!whitelist(mesh, (node_t *)node)) {
+ pthread_mutex_unlock(&mesh->mutex);
+ return false;
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
+
+ logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
+ return true;
+}
+
+bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
+ if(!mesh || !name) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ node_t *n = lookup_node(mesh, (char *)name);
+
+ if(!n) {
+ n = new_node();
+ n->name = xstrdup(name);
+ node_add(mesh, n);
+ }
+
+ 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_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
+ mesh->default_blacklist = blacklist;
+}
+
+bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
meshlink_errno = MESHLINK_EINVAL;
- return -1;
+ return false;
}
- if(!mesh->myport) {
- meshlink_errno = MESHLINK_EINTERNAL;
+ node_t *n = (node_t *)node;
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ /* 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;
+ }
+
+ /* 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;
+ }
+
+ /* 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;
+ }
+ }
+
+ /* 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);
+ }
+ }
+ }
+
+ /* Delete the config file for this node */
+ if(!config_delete(mesh, "current", n->name)) {
+ pthread_mutex_unlock(&mesh->mutex);
+ return false;
+ }
+
+ /* 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");
+}
+
+/* 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) {
+ meshlink_errno = EINVAL;
+ return;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ node_t *n = (node_t *)node;
+
+ if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
+ if(!node_write_config(mesh, n)) {
+ logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
+ }
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
+ // @TODO do we want to fire off a connection attempt right away?
+}
+
+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;
+}
+
+/* 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;
+
+ if(channel->c) {
+ channel->in_callback = true;
+
+ 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);
+ }
+ }
+
+ channel->in_callback = false;
+
+ if(!channel->c) {
+ free(aio);
+ free(channel);
+ return false;
+ }
+ }
+
+ free(aio);
+ return true;
+}
+
+/* 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;
+ }
+ }
+
+ return true;
+}
+
+static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
+ meshlink_channel_t *channel = connection->priv;
+
+ if(!channel) {
+ abort();
+ }
+
+ node_t *n = channel->node;
+ meshlink_handle_t *mesh = n->mesh;
+
+ if(n->status.destroyed) {
+ meshlink_channel_close(mesh, channel);
+ return len;
+ }
+
+ const char *p = data;
+ size_t left = len;
+
+ 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;
+ }
+
+ break;
+ }
+
+ meshlink_aio_buffer_t *aio = channel->aio_receive;
+ size_t todo = aio->len - aio->done;
+
+ if(todo > left) {
+ todo = left;
+ }
+
+ if(aio->data) {
+ memcpy((char *)aio->data + aio->done, p, todo);
+ } else {
+ ssize_t result = write(aio->fd, p, todo);
+
+ if(result <= 0) {
+ if(result < 0 && errno == EINTR) {
+ continue;
+ }
+
+ /* 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;
+ }
+ }
+
+ if(channel->receive_cb) {
+ channel->receive_cb(mesh, channel, p, left);
+ }
+
+ return len;
+}
+
+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(n->mtuprobes == 31) {
+ timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
+ 0, 0
+ });
+ }
+}
+
+static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
+ node_t *n = utcp->priv;
+
+ if(n->status.destroyed) {
return -1;
}
- return atoi(mesh->myport);
+ meshlink_handle_t *mesh = n->mesh;
+ return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
}
-bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
- if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
+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;
+ 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) {
+ abort();
+ }
+
+ utcp_recv(n->utcp, data, len);
+}
+
+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;
+
+ 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;
+ }
+
+ break;
+ }
+
+ /* 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(todo > len) {
+ todo = len;
+ }
+
+ if(aio->data) {
+ sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
+ } else {
+ /* Limit the amount we read at once to avoid stack overflows */
+ if(todo > 65536) {
+ todo = 65536;
+ }
+
+ char buf[todo];
+ ssize_t result = read(aio->fd, buf, todo);
+
+ if(result > 0) {
+ todo = result;
+ sent = utcp_send(connection, buf, todo);
+ } else {
+ if(result < 0 && errno == EINTR) {
+ continue;
+ }
+
+ /* 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));
+ }
+
+ if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
+ return;
+ }
+
+ continue;
+ }
+ }
+
+ if(sent != (ssize_t)todo) {
+ /* We should never get a partial send at this point */
+ assert(sent <= 0);
+
+ /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
+ if(!aio_abort(mesh, channel, &channel->aio_send)) {
+ return;
+ }
+
+ len = 0;
+ break;
+ }
+
+ aio->done += sent;
+ len -= sent;
+
+ /* If we didn't finish this buffer, exit early. */
+ if(aio->done < aio->len) {
+ return;
+ }
+
+ /* Signal completion of this buffer, and go to the next one. */
+ if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
+ return;
+ }
+
+ if(!len) {
+ return;
+ }
+ }
+
+ if(channel->poll_cb) {
+ channel->poll_cb(mesh, channel, len);
+ } else {
+ utcp_set_poll_cb(connection, NULL);
+ }
+}
+
+void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
+
+ channel->poll_cb = cb;
+ utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
+ pthread_mutex_unlock(&mesh->mutex);
+}
+
+void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
+ if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
- return false;
+ return;
}
- if(mesh->myport && port == atoi(mesh->myport))
- return true;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- if(!try_bind(port)) {
- meshlink_errno = MESHLINK_ENETWORK;
- return false;
+ 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);
+ utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
+ utcp_set_retransmit_cb(n->utcp, channel_retransmit);
+ }
}
- bool rval = false;
+ pthread_mutex_unlock(&mesh->mutex);
+}
- pthread_mutex_lock(&(mesh->mesh_mutex));
- if(mesh->threadstarted) {
+void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
+ (void)mesh;
+
+ if(!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, size);
+ pthread_mutex_unlock(&mesh->mutex);
+}
- init_configuration(&mesh->config);
+void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
+ (void)mesh;
- if(!read_server_config(mesh))
- meshlink_errno = MESHLINK_ESTORAGE;
- else if(!setup_network(mesh))
- meshlink_errno = MESHLINK_ENETWORK;
- else
- rval = true;
+ if(!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, size);
+ pthread_mutex_unlock(&mesh->mutex);
}
-char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
- if(!mesh) {
- meshlink_errno = MESHLINK_EINVAL;
- 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) {
+ if(data && len) {
+ abort(); // TODO: handle non-NULL data
}
- 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");
+ if(!mesh || !node) {
meshlink_errno = MESHLINK_EINVAL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
return NULL;
}
- // 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);
- 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;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- // 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;
+ node_t *n = (node_t *)node;
+
+ 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);
+ mesh->receive_cb = channel_receive;
+
+ if(!n->utcp) {
+ meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&mesh->mutex);
+ return NULL;
+ }
}
- // Get the local address
- char *address = get_my_hostname(mesh);
- if(!address) {
- logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
- meshlink_errno = MESHLINK_ERESOLV;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ 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;
}
- if(!refresh_invitation_key(mesh)) {
- meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return NULL;
+ meshlink_channel_t *channel = xzalloc(sizeof(*channel));
+ channel->node = n;
+ channel->receive_cb = cb;
+
+ if(data && !len) {
+ channel->priv = (void *)data;
}
- char hash[64];
+ channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
- // 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);
+ pthread_mutex_unlock(&mesh->mutex);
- // Create a random cookie for this invitation.
- char cookie[25];
- randomize(cookie, 18);
+ if(!channel->c) {
+ meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
+ free(channel);
+ return NULL;
+ }
- // 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);
+ return channel;
+}
- b64encode_urlsafe(cookie, cookie, 18);
+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);
+}
- free(fingerprint);
+void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
- // 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(!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(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- FILE *f = fdopen(ifd, "w");
- if(!f)
- abort();
-
- // Fill in the details.
- fprintf(f, "Name = %s\n", name);
- //if(netname)
- // fprintf(f, "NetName = %s\n", netname);
- 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");
- if(tc) {
- char buf[1024];
- 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);
- // Make sure there is a newline character.
- if(!strchr(buf, '\n'))
- fputc('\n', f);
- }
- }
- 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));
- return NULL;
+
+ utcp_shutdown(channel->c, direction);
+ pthread_mutex_unlock(&mesh->mutex);
+}
+
+void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
}
- fprintf(f, "#---------------------------------------------------------------#\n");
- fprintf(f, "Name = %s\n", mesh->self->name);
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
- fcopy(f, filename);
- fclose(f);
+ if(channel->c) {
+ utcp_close(channel->c);
+ channel->c = NULL;
- // Create an URL from the local address, key hash and cookie
- char *url;
- xasprintf(&url, "%s/%s%s", address, hash, cookie);
- free(address);
+ /* Clean up any outstanding AIO buffers. */
+ aio_abort(mesh, channel, &channel->aio_send);
+ aio_abort(mesh, channel, &channel->aio_receive);
+ }
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return url;
+ if(!channel->in_callback) {
+ free(channel);
+ }
+
+ pthread_mutex_unlock(&mesh->mutex);
}
-bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
- if(!mesh || !invitation) {
+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 false;
+ return -1;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
-
- //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);
+ if(!len) {
+ return 0;
+ }
- // Split the invitation URL into hostname, port, key hash and cookie.
+ if(!data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
- char *slash = strchr(copy, '/');
- if(!slash)
- 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.
- *slash++ = 0;
+ ssize_t retval;
- if(strlen(slash) != 48)
- goto invalid;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- char *address = copy;
- char *port = NULL;
- if(*address == '[') {
- address++;
- char *bracket = strchr(address, ']');
- if(!bracket)
- goto invalid;
- *bracket = 0;
- if(bracket[1] == ':')
- port = bracket + 2;
+ /* Disallow direct calls to utcp_send() while we still have AIO active. */
+ if(channel->aio_send) {
+ retval = 0;
} else {
- port = strchr(address, ':');
- if(port)
- *port++ = 0;
+ retval = utcp_send(channel->c, data, len);
}
- if(!port)
- goto invalid;
-
- if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
- goto invalid;
+ pthread_mutex_unlock(&mesh->mutex);
- // Generate a throw-away key for the invitation.
- ecdsa_t *key = ecdsa_generate();
- if(!key) {
- meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return false;
+ if(retval < 0) {
+ meshlink_errno = MESHLINK_ENETWORK;
}
- char *b64key = ecdsa_get_base64_public_key(key);
-
- //Before doing meshlink_join make sure we are not connected to another mesh
- if(mesh->threadstarted)
- goto invalid;
+ return retval;
+}
- // Connect to the meshlink daemon mentioned in the URL.
- struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
- if(!ai) {
- meshlink_errno = MESHLINK_ERESOLV;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+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) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
- mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
- if(mesh->sock <= 0) {
- logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
- freeaddrinfo(ai);
- meshlink_errno = MESHLINK_ENETWORK;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ if(!len || !data) {
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
- set_timeout(mesh->sock, 5000);
+ meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
+ aio->data = data;
+ aio->len = len;
+ aio->cb.buffer = cb;
+ aio->priv = priv;
- if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
- logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
- closesocket(mesh->sock);
- freeaddrinfo(ai);
- meshlink_errno = MESHLINK_ENETWORK;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return false;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- freeaddrinfo(ai);
+ /* Append the AIO buffer descriptor to the end of the chain */
+ meshlink_aio_buffer_t **p = &channel->aio_send;
- logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
+ while(*p) {
+ p = &(*p)->next;
+ }
- // Tell him we have an invitation, and give him our throw-away key.
+ *p = aio;
- mesh->blen = 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_rcvbuf_free(channel->c));
- if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
- 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;
+ if(todo) {
+ channel_poll(channel->c, todo);
}
- free(b64key);
+ pthread_mutex_unlock(&mesh->mutex);
- char hisname[4096] = "";
- int code, hismajor, hisminor = 0;
+ return true;
+}
- 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));
+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) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
- // Check if the hash of the key he gave us matches the hash in the URL.
- char *fingerprint = mesh->line + 2;
- char hishash[64];
- 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));
+ if(!len || fd == -1) {
+ 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));
- return false;
- }
+ meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
+ aio->fd = fd;
+ aio->len = len;
+ aio->cb.fd = cb;
+ aio->priv = priv;
- ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
- 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;
+ *p = aio;
- while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
- if(len < 0) {
- if(errno == EINTR)
- continue;
- 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_rcvbuf_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 or you are already connected to a Mesh ?\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) {
+ if(!mesh || !channel) {
meshlink_errno = MESHLINK_EINVAL;
- return NULL;
+ return false;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
-
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
- FILE *f = fopen(filename, "r");
- 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(!len || !data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
}
- fseek(f, 0, SEEK_END);
- int fsize = ftell(f);
- rewind(f);
+ meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
+ aio->data = data;
+ aio->len = len;
+ aio->cb.buffer = cb;
+ aio->priv = priv;
- 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);
- meshlink_errno = MESHLINK_ESTORAGE;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return NULL;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- fclose(f);
- buf[len - 1] = 0;
-
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return buf;
-}
+ /* Append the AIO buffer descriptor to the end of the chain */
+ meshlink_aio_buffer_t **p = &channel->aio_receive;
-bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
- if(!mesh || !data) {
- meshlink_errno = MESHLINK_EINVAL;
- return false;
+ while(*p) {
+ p = &(*p)->next;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ *p = aio;
- if(strncmp(data, "Name = ", 7)) {
- logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
- meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return false;
- }
+ pthread_mutex_unlock(&mesh->mutex);
- char *end = strchr(data + 7, '\n');
- if(!end) {
- logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
- meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return false;
- }
+ return true;
+}
- int len = end - (data + 7);
- char name[len + 1];
- memcpy(name, data + 7, len);
- name[len] = 0;
- if(!check_id(name)) {
- logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
- meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+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) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
- char filename[PATH_MAX];
- snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
- 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));
+ if(!len || fd == -1) {
+ meshlink_errno = MESHLINK_EINVAL;
return false;
}
- 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;
+ meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
+ aio->fd = fd;
+ aio->len = len;
+ aio->cb.fd = cb;
+ aio->priv = priv;
+
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- FILE *f = fopen(filename, "w");
- 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;
+ /* Append the AIO buffer descriptor to the end of the chain */
+ meshlink_aio_buffer_t **p = &channel->aio_receive;
+
+ while(*p) {
+ p = &(*p)->next;
}
- fwrite(end + 1, strlen(end + 1), 1, f);
- fclose(f);
+ *p = aio;
- load_all_nodes(mesh);
+ pthread_mutex_unlock(&mesh->mutex);
- pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
-void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
- if(!mesh || !node) {
+uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+ if(!mesh || !channel) {
meshlink_errno = MESHLINK_EINVAL;
- return;
+ return -1;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ return channel->c->flags;
+}
- node_t *n;
- n = (node_t *)node;
- n->status.blacklisted = true;
- logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
+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;
+ }
- //Make blacklisting persistent in the config file
- append_config_file(mesh, n->name, "blacklisted", "yes");
+ return utcp_get_recvq(channel->c);
+}
+
+size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
+ if(!mesh || !channel) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return;
+ return utcp_get_mss(channel->node->utcp);
}
-void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
+void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
if(!mesh || !node) {
meshlink_errno = MESHLINK_EINVAL;
return;
}
- 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(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- return;
-}
+ 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);
+ }
-void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
- mesh->default_blacklist = blacklist;
+ utcp_set_user_timeout(n->utcp, timeout);
+
+ pthread_mutex_unlock(&mesh->mutex);
}
-/* 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)
- 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);
+ }
- // Ignore hints about ourself.
- if((node_t *)node == mesh->self)
- return;
+ if(mesh->node_status_cb) {
+ mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
+ }
- pthread_mutex_lock(&(mesh->mesh_mutex));
+ if(mesh->node_pmtu_cb) {
+ mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
+ }
+}
- char *host = NULL, *port = NULL, *str = NULL;
- sockaddr2str((const sockaddr_t *)addr, &host, &port);
+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(host && port) {
- xasprintf(&str, "%s %s", host, port);
- if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0))
- append_config_file(mesh, node->name, "Address", str);
- else
- logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
+ if(mesh->node_pmtu_cb && !n->status.blacklisted) {
+ mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
}
+}
- free(str);
- free(host);
- free(port);
+void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
+ if(!mesh->node_duplicate_cb || n->status.duplicate) {
+ return;
+ }
- pthread_mutex_unlock(&(mesh->mesh_mutex));
- // @TODO do we want to fire off a connection attempt right away?
+ n->status.duplicate = true;
+ mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
}
-/* Return an array of edges in the current network graph.
- * Data captures the current state and will not be updated.
- * Caller must deallocate data when done.
- */
-meshlink_edge_t **meshlink_get_all_edges_state(meshlink_handle_t *mesh, meshlink_edge_t **edges, size_t *nmemb) {
- if(!mesh || !nmemb || (*nmemb && !edges)) {
+void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
+#if HAVE_CATTA
+
+ if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
- return NULL;
+ return;
}
- pthread_mutex_lock(&(mesh->mesh_mutex));
-
- meshlink_edge_t **result = NULL;
- meshlink_edge_t *copy = NULL;
- int result_size = 0;
-
- result_size = mesh->edges->count;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- // if result is smaller than edges, we have to dealloc all the excess meshlink_edge_t
- if(result_size > *nmemb)
- result = realloc(edges, result_size * sizeof(meshlink_edge_t *));
- else
- result = edges;
+ if(mesh->discovery == enable) {
+ goto end;
+ }
- if(result) {
- meshlink_edge_t **p = result;
- int n = 0;
- for splay_each(edge_t, e, mesh->edges) {
- // skip edges that do not represent a two-directional connection
- if((!e->reverse) || (e->reverse->to != e->from)) {
- result_size--;
- continue;
- }
- n++;
- // the first *nmemb members of result can be re-used
- if(n > *nmemb)
- copy = xzalloc(sizeof(*copy));
- else
- copy = *p;
- copy->from = (meshlink_node_t *)e->from;
- copy->to = (meshlink_node_t *)e->to;
- copy->address = e->address.storage;
- copy->options = e->options;
- copy->weight = e->weight;
- *p++ = copy;
- }
- // shrink result to the actual amount of memory used
- for(int i = *nmemb; i > result_size; i--)
- free(result[i - 1]);
- result = realloc(result, result_size * sizeof(meshlink_edge_t *));
- *nmemb = result_size;
- } else {
- *nmemb = 0;
- meshlink_errno = MESHLINK_ENOMEM;
+ if(mesh->threadstarted) {
+ if(enable) {
+ discovery_start(mesh);
+ } else {
+ discovery_stop(mesh);
+ }
}
- pthread_mutex_unlock(&(mesh->mesh_mutex));
+ mesh->discovery = enable;
- return result;
+end:
+ pthread_mutex_unlock(&mesh->mutex);
+#else
+ (void)mesh;
+ (void)enable;
+ meshlink_errno = MESHLINK_ENOTSUP;
+#endif
}
-static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
- node_t *n = utcp->priv;
- meshlink_handle_t *mesh = n->mesh;
- return mesh->channel_accept_cb;
-}
+void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
+ if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
+ meshlink_errno = EINVAL;
+ return;
+ }
-static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
- meshlink_channel_t *channel = connection->priv;
- if(!channel)
- abort();
- node_t *n = channel->node;
- meshlink_handle_t *mesh = n->mesh;
- if(n->status.destroyed)
- meshlink_channel_close(mesh, channel);
- else if(channel->receive_cb)
- channel->receive_cb(mesh, channel, data, len);
- return len;
-}
+ if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
+ meshlink_errno = EINVAL;
+ return;
+ }
-static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
- node_t *n = utcp_connection->utcp->priv;
- if(!n)
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
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 ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
- node_t *n = utcp->priv;
- meshlink_handle_t *mesh = n->mesh;
- return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? len : -1;
+ mesh->dev_class_traits[devclass].pinginterval = pinginterval;
+ mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
+ pthread_mutex_unlock(&mesh->mutex);
}
-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;
+void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
+ if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
+ meshlink_errno = EINVAL;
return;
}
- channel->receive_cb = cb;
-}
+ if(fast_retry_period < 0) {
+ meshlink_errno = EINVAL;
+ return;
+ }
-static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
- node_t *n = (node_t *)source;
- if(!n->utcp)
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
abort();
- utcp_recv(n->utcp, data, len);
-}
+ }
-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;
- if(channel->poll_cb)
- channel->poll_cb(mesh, channel, len);
+ mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
+ pthread_mutex_unlock(&mesh->mutex);
}
-void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
- channel->poll_cb = cb;
- utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
-}
+void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
+ if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
+ meshlink_errno = EINVAL;
+ return;
+ }
-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(!mesh || !node) {
- meshlink_errno = MESHLINK_EINVAL;
- return NULL;
+void meshlink_reset_timers(struct meshlink_handle *mesh) {
+ 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;
- }
- }
- 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);
- if(!channel->c) {
- meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
- free(channel);
- return NULL;
+ if(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
}
- return channel;
-}
-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);
+ handle_network_change(mesh, true);
+ pthread_mutex_unlock(&mesh->mutex);
}
-void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
- if(!mesh || !channel) {
- meshlink_errno = MESHLINK_EINVAL;
+void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
+ 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) {
+ if(!mesh) {
+ meshlink_errno = EINVAL;
+ return;
}
- if(!len)
- return 0;
-
- 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(pthread_mutex_lock(&mesh->mutex) != 0) {
+ abort();
+ }
- if(retval < 0)
- meshlink_errno = MESHLINK_ENETWORK;
- 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) {
+ 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);
- if(mesh->node_status_cb)
- mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
-}
+void handle_network_change(meshlink_handle_t *mesh, bool online) {
+ (void)online;
-void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
- if(!mesh) {
- meshlink_errno = MESHLINK_EINVAL;
+ if(!mesh->connections || !mesh->loop.running) {
return;
}
- pthread_mutex_lock(&mesh->mesh_mutex);
-
- if(mesh->discovery == enable)
- goto end;
+ retry(mesh);
+ signal_trigger(&mesh->loop, &mesh->datafromapp);
+}
- if(mesh->threadstarted) {
- if(enable)
- discovery_start(mesh);
- else
- discovery_stop(mesh);
+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;
}
- mesh->discovery = enable;
+ if(!mesh->threadstarted) {
+ return;
+ }
-end:
- pthread_mutex_unlock(&mesh->mesh_mutex);
+ 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
-};