X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fmeshlink.c;h=418be9e878d636b59844356d10b6a28e05bea162;hb=82e6ef764b4f1d2c2b6c1be35452cb87aff11350;hp=9a53d67aefae1c7e4e238fe9c784436c843bd58c;hpb=ef2f0d4510168a77a6da16822b9401d1f14b69e0;p=meshlink diff --git a/src/meshlink.c b/src/meshlink.c index 9a53d67a..418be9e8 100644 --- a/src/meshlink.c +++ b/src/meshlink.c @@ -1,6 +1,6 @@ /* meshlink.c -- Implementation of the MeshLink API. - Copyright (C) 2014 Guus Sliepen + Copyright (C) 2014, 2017 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -16,11 +16,13 @@ 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 tinc.conf */ +#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; @@ -31,19 +33,26 @@ typedef struct { #include "crypto.h" #include "ecdsagen.h" +#include "logger.h" #include "meshlink_internal.h" #include "netutl.h" #include "node.h" #include "protocol.h" #include "route.h" +#include "sockaddr.h" #include "utils.h" #include "xalloc.h" #include "ed25519/sha512.h" +#include "discovery.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 */ @@ -111,7 +120,7 @@ const var_t variables[] = { static bool fcopy(FILE *out, const char *filename) { FILE *in = fopen(filename, "r"); if(!in) { - fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno)); + logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno)); return false; } @@ -172,27 +181,24 @@ static void scan_for_hostname(const char *filename, char **hostname, char **port fclose(f); } -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] = ""; - char line[4096]; - FILE *f; - // 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); +static bool is_valid_hostname(const char *hostname) { + for(const char *p = hostname; *p; p++) { + if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) + return false; + } - if(hostname) - goto done; + return true; +} + +char *meshlink_get_external_address(meshlink_handle_t *mesh) { + char *hostname = NULL; - // If that doesn't work, guess externally visible hostname - fprintf(stderr, "Trying to discover externally visible hostname...\n"); - struct addrinfo *ai = str2addrinfo("tinc-vpn.org", "80", SOCK_STREAM); + 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://tinc-vpn.org/host.cgi HTTP/1.0\r\n\r\n"; + static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n"; + char line[256]; while(aip) { int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol); @@ -225,17 +231,33 @@ static char *get_my_hostname(meshlink_handle_t* mesh) { freeaddrinfo(ai); // Check that the hostname is reasonable - if(hostname) { - for(char *p = hostname; *p; p++) { - if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':') - continue; - // If not, forget it. - free(hostname); - hostname = NULL; - break; - } + if(hostname && !is_valid_hostname(hostname)) { + free(hostname); + hostname = NULL; } + 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; + + // 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); + + if(hostname) + goto done; + + hostname = meshlink_get_external_address(mesh); if(!hostname) return NULL; @@ -244,7 +266,7 @@ static char *get_my_hostname(meshlink_handle_t* mesh) { fprintf(f, "\nAddress = %s\n", hostname); fclose(f); } else { - fprintf(stderr, "Could not append Address to %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno)); } done: @@ -278,7 +300,7 @@ static char *get_line(const char **data) { const char *end = strchr(*data, '\n'); size_t len = end ? end - *data : strlen(*data); if(len >= sizeof line) { - fprintf(stderr, "Maximum line length exceeded!\n"); + logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n"); return NULL; } if(len && !isprint(**data)) @@ -327,55 +349,54 @@ static bool try_bind(int port) { while(ai) { int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP); - if(!fd) + if(!fd) { + freeaddrinfo(ai); return false; + } int result = bind(fd, ai->ai_addr, ai->ai_addrlen); closesocket(fd); - if(result) + if(result) { + freeaddrinfo(ai); return false; + } ai = ai->ai_next; } + freeaddrinfo(ai); return true; } static int check_port(meshlink_handle_t *mesh) { - if(try_bind(655)) - return 655; - - fprintf(stderr, "Warning: could not bind to port 655.\n"); - - for(int i = 0; i < 100; i++) { + 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) { - fprintf(stderr, "Please change MeshLink's Port manually.\n"); + logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n"); return 0; } fprintf(f, "Port = %d\n", port); fclose(f); - fprintf(stderr, "MeshLink will instead listen on port %d.\n", port); return port; } } - fprintf(stderr, "Please change MeshLink's Port manually.\n"); + logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n"); return 0; } static bool finalize_join(meshlink_handle_t *mesh) { char *name = xstrdup(get_value(mesh->data, "Name")); if(!name) { - fprintf(stderr, "No Name found in invitation!\n"); + logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n"); return false; } if(!check_id(name)) { - fprintf(stderr, "Invalid Name found in invitation: %s!\n", name); + logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name); return false; } @@ -384,7 +405,7 @@ static bool finalize_join(meshlink_handle_t *mesh) { FILE *f = fopen(filename, "w"); if(!f) { - fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); return false; } @@ -393,12 +414,12 @@ static bool finalize_join(meshlink_handle_t *mesh) { snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); FILE *fh = fopen(filename, "w"); if(!fh) { - fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); fclose(f); return false; } - // Filter first chunk on approved keywords, split between tinc.conf and hosts/Name + // 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; @@ -439,10 +460,10 @@ static bool finalize_join(meshlink_handle_t *mesh) { // Ignore unknown and unsafe variables if(!found) { - fprintf(stderr, "Ignoring unknown variable '%s' in invitation.\n", l); + logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l); continue; } else if(!(variables[i].type & VAR_SAFE)) { - fprintf(stderr, "Ignoring unsafe variable '%s' in invitation.\n", l); + logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l); continue; } @@ -454,12 +475,12 @@ static bool finalize_join(meshlink_handle_t *mesh) { while(l && !strcasecmp(l, "Name")) { if(!check_id(value)) { - fprintf(stderr, "Invalid Name found in invitation.\n"); + logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n"); return false; } if(!strcmp(value, name)) { - fprintf(stderr, "Secondary chunk would overwrite our own host config file.\n"); + logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n"); return false; } @@ -467,7 +488,7 @@ static bool finalize_join(meshlink_handle_t *mesh) { f = fopen(filename, "w"); if(!f) { - fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); return false; } @@ -494,8 +515,10 @@ static bool finalize_join(meshlink_handle_t *mesh) { } char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa); - if(!b64key) + if(!b64key) { + fclose(fh); return false; + } fprintf(fh, "ECDSAPublicKey = %s\n", b64key); fprintf(fh, "Port = %s\n", mesh->myport); @@ -508,9 +531,9 @@ static bool finalize_join(meshlink_handle_t *mesh) { free(mesh->self->name); free(mesh->self->connection->name); mesh->self->name = xstrdup(name); - mesh->self->connection->name = xstrdup(name); + mesh->self->connection->name = name; - fprintf(stderr, "Configuration stored in: %s\n", mesh->confbase); + logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase); load_all_nodes(mesh); @@ -545,10 +568,11 @@ static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint break; case 1: + mesh->thedatalen = 0; return finalize_join(mesh); case 2: - fprintf(stderr, "Invitation succesfully accepted.\n"); + logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n"); shutdown(mesh->sock, SHUT_RDWR); mesh->success = true; break; @@ -618,12 +642,21 @@ static bool sendline(int fd, char *format, ...) { static const char *errstr[] = { [MESHLINK_OK] = "No error", + [MESHLINK_EINVAL] = "Invalid argument", [MESHLINK_ENOMEM] = "Out of memory", [MESHLINK_ENOENT] = "No such node", + [MESHLINK_EEXIST] = "Node already exists", + [MESHLINK_EINTERNAL] = "Internal error", + [MESHLINK_ERESOLV] = "Could not resolve hostname", + [MESHLINK_ESTORAGE] = "Storage error", + [MESHLINK_ENETWORK] = "Network error", + [MESHLINK_EPEER] = "Error communicating with peer", }; -const char *meshlink_strerror(meshlink_errno_t errno) { - return errstr[errno]; +const char *meshlink_strerror(meshlink_errno_t err) { + if(err < 0 || err >= sizeof errstr / sizeof *errstr) + return "Invalid error code"; + return errstr[err]; } static bool ecdsa_keygen(meshlink_handle_t *mesh) { @@ -631,39 +664,44 @@ static bool ecdsa_keygen(meshlink_handle_t *mesh) { FILE *f; char pubname[PATH_MAX], privname[PATH_MAX]; - fprintf(stderr, "Generating ECDSA keypair:\n"); + logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n"); if(!(key = ecdsa_generate())) { - fprintf(stderr, "Error during key generation!\n"); + logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n"); + meshlink_errno = MESHLINK_EINTERNAL; return false; } else - fprintf(stderr, "Done.\n"); + logger(mesh, MESHLINK_DEBUG, "Done.\n"); snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase); - f = fopen(privname, "w"); + f = fopen(privname, "wb"); - if(!f) + if(!f) { + meshlink_errno = MESHLINK_ESTORAGE; return false; + } #ifdef HAVE_FCHMOD fchmod(fileno(f), 0600); #endif if(!ecdsa_write_pem_private_key(key, f)) { - fprintf(stderr, "Error writing private key!\n"); + logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n"); ecdsa_free(key); fclose(f); + meshlink_errno = MESHLINK_EINTERNAL; return false; } fclose(f); - snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name); f = fopen(pubname, "a"); - if(!f) + if(!f) { + meshlink_errno = MESHLINK_ESTORAGE; return false; + } char *pubkey = ecdsa_get_base64_public_key(key); fprintf(f, "ECDSAPublicKey = %s\n", pubkey); @@ -675,9 +713,82 @@ static bool ecdsa_keygen(meshlink_handle_t *mesh) { return true; } +static struct timeval idle(event_loop_t *loop, void *data) { + meshlink_handle_t *mesh = data; + struct timeval t, tmin = {3600, 0}; + for splay_each(node_t, n, mesh->nodes) { + if(!n->utcp) + continue; + t = utcp_timeout(n->utcp); + if(timercmp(&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, + }; + + if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) + return false; + + int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol); + if(sock == -1) { + freeaddrinfo(rai); + return false; + } + + if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) { + freeaddrinfo(rai); + return false; + } + + freeaddrinfo(rai); + + struct sockaddr_storage sn; + socklen_t sl = sizeof sn; + + if(getsockname(sock, (struct sockaddr *)&sn, &sl)) + return false; + + if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) + 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]; + + // IPv4 example.org + + if(getlocaladdrname("93.184.216.34", host, sizeof host)) { + snprintf(entry, sizeof entry, "%s %s", host, mesh->myport); + append_config_file(mesh, mesh->name, "Address", entry); + } + + // IPv6 example.org + + if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof host)) { + snprintf(entry, sizeof entry, "%s %s", host, mesh->myport); + append_config_file(mesh, mesh->name, "Address", entry); + } +} + static bool meshlink_setup(meshlink_handle_t *mesh) { if(mkdir(mesh->confbase, 0777) && errno != EEXIST) { - fprintf(stderr, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; return false; } @@ -685,63 +796,92 @@ static bool meshlink_setup(meshlink_handle_t *mesh) { snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase); if(mkdir(filename, 0777) && errno != EEXIST) { - fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; return false; } snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase); if(!access(filename, F_OK)) { - fprintf(stderr, "Configuration file %s already exists!\n", filename); + logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename); + meshlink_errno = MESHLINK_EEXIST; return false; } FILE *f = fopen(filename, "w"); if(!f) { - fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno)); - return 1; + logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + return false; } fprintf(f, "Name = %s\n", mesh->name); fclose(f); - if(!ecdsa_keygen(mesh)) + if(!ecdsa_keygen(mesh)) { + meshlink_errno = MESHLINK_EINTERNAL; return false; + } check_port(mesh); return true; } -meshlink_handle_t *meshlink_open(const char *confbase, const char *name) { +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; + + logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n"); if(!confbase || !*confbase) { - fprintf(stderr, "No confbase given!\n"); + logger(NULL, MESHLINK_ERROR, "No confbase given!\n"); + meshlink_errno = MESHLINK_EINVAL; return NULL; } - if(!name || !*name) { - fprintf(stderr, "No name given!\n"); + if(!appname || !*appname) { + logger(NULL, MESHLINK_ERROR, "No appname given!\n"); + meshlink_errno = MESHLINK_EINVAL; return NULL; } - if(!check_id(name)) { - fprintf(stderr, "Invalid name given!\n"); + if(!name || !*name) { + logger(NULL, MESHLINK_ERROR, "No name given!\n"); + //return NULL; + } + else { //check name only if there is a name != NULL + + if(!check_id(name)) { + logger(NULL, MESHLINK_ERROR, "Invalid name given!\n"); + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } else { usingname = true;} + } + + if(devclass < 0 || devclass > _DEV_CLASS_MAX) { + logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n"); + meshlink_errno = MESHLINK_EINVAL; return NULL; } - meshlink_handle_t *mesh = xzalloc(sizeof *mesh); + meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t)); mesh->confbase = xstrdup(confbase); - mesh->name = xstrdup(name); - pthread_mutex_init ( &(mesh->outpacketqueue_mutex), NULL); - pthread_mutex_init ( &(mesh->nodes_mutex), NULL); + 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; - // TODO: should be set by a function. - mesh->debug_level = 5; - // Check whether meshlink.conf already exists char filename[PATH_MAX]; @@ -750,10 +890,15 @@ meshlink_handle_t *meshlink_open(const char *confbase, const char *name) { if(access(filename, R_OK)) { if(errno == ENOENT) { // If not, create it - meshlink_setup(mesh); + if(!meshlink_setup(mesh)) { + // meshlink_errno is set by meshlink_setup() + return NULL; + } } else { - fprintf(stderr, "Cannot not read from %s: %s\n", filename, strerror(errno)); - return meshlink_close(mesh), NULL; + logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno)); + meshlink_close(mesh); + meshlink_errno = MESHLINK_ESTORAGE; + return NULL; } } @@ -761,8 +906,11 @@ meshlink_handle_t *meshlink_open(const char *confbase, const char *name) { init_configuration(&mesh->config); - if(!read_server_config(mesh)) - return meshlink_close(mesh), NULL; + if(!read_server_config(mesh)) { + meshlink_close(mesh); + meshlink_errno = MESHLINK_ESTORAGE; + return NULL; + }; #ifdef HAVE_MINGW struct WSAData wsa_state; @@ -772,168 +920,466 @@ meshlink_handle_t *meshlink_open(const char *confbase, const char *name) { // Setup up everything // TODO: we should not open listening sockets yet - if(!setup_network(mesh)) - return meshlink_close(mesh), NULL; + if(!setup_network(mesh)) { + meshlink_close(mesh); + meshlink_errno = MESHLINK_ENETWORK; + return NULL; + } + + add_local_addresses(mesh); + idle_set(&mesh->loop, idle, mesh); + + logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n"); return mesh; } -void *meshlink_main_loop(void *arg) { +static void *meshlink_main_loop(void *arg) { meshlink_handle_t *mesh = arg; + pthread_mutex_lock(&(mesh->mesh_mutex)); + try_outgoing_connections(mesh); + logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n"); main_loop(mesh); + logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n"); + pthread_mutex_unlock(&(mesh->mesh_mutex)); return NULL; } bool meshlink_start(meshlink_handle_t *mesh) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n"); + + pthread_mutex_lock(&(mesh->mesh_mutex)); + + if(mesh->threadstarted) { + logger(mesh, MESHLINK_DEBUG, "thread was already running\n"); + pthread_mutex_unlock(&(mesh->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; + } + + mesh->thedatalen = 0; + // 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->mesh_mutex)); + return false; + } + // Start the main thread + event_loop_start(&mesh->loop); + if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) { - fprintf(stderr, "Could not start thread: %s\n", strerror(errno)); + 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)); return false; } + mesh->threadstarted=true; + + discovery_start(mesh); + + pthread_mutex_unlock(&(mesh->mesh_mutex)); return true; } void meshlink_stop(meshlink_handle_t *mesh) { - // Shut down the listening sockets to signal the main thread to shut down - - for(int i = 0; i < mesh->listen_sockets; i++) { - shutdown(mesh->listen_socket[i].tcp.fd, SHUT_RDWR); - shutdown(mesh->listen_socket[i].udp.fd, SHUT_RDWR); + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; } - // Wait for the main thread to finish + pthread_mutex_lock(&(mesh->mesh_mutex)); + logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n"); + + // Stop discovery + discovery_stop(mesh); + + pthread_mutex_lock(&(mesh->mesh_mutex)); + logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n"); + + // 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"); + + // Wait for the main thread to finish + pthread_mutex_unlock(&(mesh->mesh_mutex)); pthread_join(mesh->thread, NULL); + pthread_mutex_lock(&(mesh->mesh_mutex)); + + mesh->threadstarted = false; + + pthread_mutex_unlock(&(mesh->mesh_mutex)); } void meshlink_close(meshlink_handle_t *mesh) { + if(!mesh || !mesh->confbase) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + // stop can be called even if mesh has not been started + meshlink_stop(mesh); + + // lock is not released after this + pthread_mutex_lock(&(mesh->mesh_mutex)); + // Close and free all resources used. close_network_connections(mesh); - logger(DEBUG_ALWAYS, LOG_NOTICE, "Terminating"); + logger(mesh, MESHLINK_INFO, "Terminating"); exit_configuration(&mesh->config); event_loop_exit(&mesh->loop); #ifdef HAVE_MINGW - WSACleanup(); + if(mesh->confbase) + WSACleanup(); #endif + + ecdsa_free(mesh->invitation_key); + + free(mesh->name); + free(mesh->appname); + free(mesh->confbase); + pthread_mutex_destroy(&(mesh->mesh_mutex)); + + memset(mesh, 0, sizeof *mesh); + + free(mesh); +} + +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); + } + rmdir(dirname); + return; +} + +bool meshlink_destroy(const char *confbase) { + if(!confbase) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + 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; + } + } + + deltree(confbase); + + return true; } void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); mesh->receive_cb = cb; + pthread_mutex_unlock(&(mesh->mesh_mutex)); } void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); mesh->node_status_cb = cb; + pthread_mutex_unlock(&(mesh->mesh_mutex)); } void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) { - mesh->log_cb = cb; - mesh->log_level = level; + 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; + } } -bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, unsigned int len) { +bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) { + meshlink_packethdr_t *hdr; - /* If there is no outgoing list yet, create one. */ + // Validate arguments + if(!mesh || !destination || len >= MAXSIZE - sizeof *hdr) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } - if(!mesh->outpacketqueue) - mesh->outpacketqueue = list_alloc(NULL); + 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; + } + + 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(hdr->destination, destination->name, (sizeof hdr->destination) - 1); + strncpy(hdr->source, mesh->self->name, (sizeof hdr->source) -1 ); + + memcpy(packet->data + sizeof *hdr, data, len); - //add packet to the queue - outpacketqueue_t *packet_in_queue = xzalloc(sizeof *packet_in_queue); - packet_in_queue->destination=destination; - packet_in_queue->data=data; - packet_in_queue->len=len; - pthread_mutex_lock(&(mesh->outpacketqueue_mutex)); - list_insert_head(mesh->outpacketqueue,packet_in_queue); - pthread_mutex_unlock(&(mesh->outpacketqueue_mutex)); + // Queue it + if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) { + free(packet); + meshlink_errno = MESHLINK_ENOMEM; + return false; + } - //notify event loop + // Notify event loop signal_trigger(&(mesh->loop),&(mesh->datafromapp)); + return true; } -void meshlink_send_from_queue(event_loop_t* el,meshlink_handle_t *mesh) { - vpn_packet_t packet; - meshlink_packethdr_t *hdr = (meshlink_packethdr_t *)packet.data; +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; - outpacketqueue_t* p = list_get_tail(mesh->outpacketqueue); - if (p) - list_delete_tail(mesh->outpacketqueue); - else return ; + mesh->self->in_packets++; + mesh->self->in_bytes += packet->len; + route(mesh, mesh->self, packet); +} - if (sizeof(meshlink_packethdr_t) + p->len > MAXSIZE) { - //log something - return ; +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)); - packet.probe = false; - memset(hdr, 0, sizeof *hdr); - memcpy(hdr->destination, p->destination->name, sizeof hdr->destination); - memcpy(hdr->source, mesh->self->name, sizeof hdr->source); + node_t *n = (node_t *)destination; + if(!n->status.reachable) { + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return 0; + + } + 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; + } +} + +char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + pthread_mutex_lock(&(mesh->mesh_mutex)); - packet.len = sizeof *hdr + p->len; - memcpy(packet.data + sizeof *hdr, p->data, p->len); + node_t *n = (node_t *)node; - mesh->self->in_packets++; - mesh->self->in_bytes += packet.len; - route(mesh, mesh->self, &packet); - return ; + if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return false; + } + + char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa); + + if(!fingerprint) + meshlink_errno = MESHLINK_EINTERNAL; + + pthread_mutex_unlock(&(mesh->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) { - return (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const + if(!mesh || !name) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + meshlink_node_t *node = NULL; + + 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; } -size_t meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t nmemb) { - size_t i = 0; +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 - pthread_mutex_lock(&(mesh->nodes_mutex)); + pthread_mutex_lock(&(mesh->mesh_mutex)); - for splay_each(node_t, n, mesh->nodes) { - if(i < nmemb) - nodes[i] = (meshlink_node_t *)n; - i++; + *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->nodes_mutex)); + pthread_mutex_unlock(&(mesh->mesh_mutex)); - return i; + return result; } -char *meshlink_sign(meshlink_handle_t *mesh, const char *data, size_t len) { - return NULL; +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; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); + + if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return false; + } + + *siglen = MESHLINK_SIGLEN; + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return true; } -bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const char *data, size_t len, const char *signature) { - return false; +bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) { + if(!mesh || !data || !len || !signature) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + if(siglen != MESHLINK_SIGLEN) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); + + bool rval = false; + + 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; } static bool refresh_invitation_key(meshlink_handle_t *mesh) { char filename[PATH_MAX]; + + pthread_mutex_lock(&(mesh->mesh_mutex)); snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase); if(mkdir(filename, 0700) && errno != EEXIST) { - fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } // Count the number of valid invitations, clean up old ones DIR *dir = opendir(filename); if(!dir) { - fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno)); + 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; } @@ -954,14 +1400,16 @@ static bool refresh_invitation_key(meshlink_handle_t *mesh) { else unlink(invname); } else { - fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno)); errno = 0; } } if(errno) { - fprintf(stderr, "Error while reading directory %s: %s\n", filename, strerror(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; } @@ -978,25 +1426,33 @@ static bool refresh_invitation_key(meshlink_handle_t *mesh) { } } - if(mesh->invitation_key) + if(mesh->invitation_key) { + pthread_mutex_unlock(&(mesh->mesh_mutex)); return true; + } // Create a new key if necessary. - FILE *f = fopen(filename, "r"); + FILE *f = fopen(filename, "rb"); if(!f) { if(errno != ENOENT) { - fprintf(stderr, "Could not read %s: %s\n", filename, strerror(errno)); + 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; } mesh->invitation_key = ecdsa_generate(); if(!mesh->invitation_key) { - fprintf(stderr, "Could not generate a new key!\n"); + logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n"); + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } - f = fopen(filename, "w"); + f = fopen(filename, "wb"); if(!f) { - fprintf(stderr, "Could not write %s: %s\n", filename, strerror(errno)); + 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; } chmod(filename, 0600); @@ -1005,28 +1461,70 @@ static bool refresh_invitation_key(meshlink_handle_t *mesh) { } else { mesh->invitation_key = ecdsa_read_pem_private_key(f); fclose(f); - if(!mesh->invitation_key) - fprintf(stderr, "Could not read private key from %s\n", filename); + if(!mesh->invitation_key) { + logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename); + meshlink_errno = MESHLINK_ESTORAGE; + } } + pthread_mutex_unlock(&(mesh->mesh_mutex)); return mesh->invitation_key; } bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) { - for(const char *p = address; *p; p++) { - if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':') - continue; - fprintf(stderr, "Invalid character in address: %s\n", address); + if(!mesh || !address) { + meshlink_errno = MESHLINK_EINVAL; return false; } - return append_config_file(mesh, mesh->self->name, "Address", address); + if(!is_valid_hostname(address)) { + logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address); + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + 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; +} + +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 = false; + + pthread_mutex_lock(&(mesh->mesh_mutex)); + rval = append_config_file(mesh, mesh->self->name, "Address", address); + pthread_mutex_unlock(&(mesh->mesh_mutex)); + + free(address); + return rval; } char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { + if(!mesh) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); + // Check validity of the new node's name if(!check_id(name)) { - fprintf(stderr, "Invalid name for node.\n"); + logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n"); + meshlink_errno = MESHLINK_EINVAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return NULL; } @@ -1034,25 +1532,34 @@ char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { char filename[PATH_MAX]; snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); if(!access(filename, F_OK)) { - fprintf(stderr, "A host config file for %s already exists!\n", name); + 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; } // Ensure no other nodes know about this name if(meshlink_get_node(mesh, name)) { - fprintf(stderr, "A node with name %s is already known!\n", 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; } // Get the local address char *address = get_my_hostname(mesh); if(!address) { - fprintf(stderr, "No Address known for ourselves!\n"); + logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n"); + meshlink_errno = MESHLINK_ERESOLV; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return NULL; } - if(!refresh_invitation_key(mesh)) + if(!refresh_invitation_key(mesh)) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return NULL; + } char hash[64]; @@ -1075,11 +1582,15 @@ char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { b64encode_urlsafe(cookie, cookie, 18); + free(fingerprint); + // 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) { - fprintf(stderr, "Could not create invitation file %s: %s\n", filename, strerror(errno)); + 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; } FILE *f = fdopen(ifd, "w"); @@ -1108,7 +1619,9 @@ char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { } fclose(tc); } else { - fprintf(stderr, "Could not create %s: %s\n", filename, strerror(errno)); + 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; } @@ -1122,11 +1635,20 @@ char *meshlink_invite(meshlink_handle_t *mesh, const char *name) { // 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->mesh_mutex)); return url; } bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { + if(!mesh || !invitation) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + 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); @@ -1159,59 +1681,78 @@ bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { } if(!port) - port = "655"; + goto invalid; if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) goto invalid; // Generate a throw-away key for the invitation. ecdsa_t *key = ecdsa_generate(); - if(!key) + if(!key) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } char *b64key = ecdsa_get_base64_public_key(key); //Before doing meshlink_join make sure we are not connected to another mesh - if ( pthread_kill(mesh->thread,0) == 0){ - printf("HELLO\n"); + if ( mesh->threadstarted ){ goto invalid; } // Connect to the meshlink daemon mentioned in the URL. struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM); - if(!ai) + if(!ai) { + meshlink_errno = MESHLINK_ERESOLV; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); if(mesh->sock <= 0) { - fprintf(stderr, "Could not open socket: %s\n", strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno)); + freeaddrinfo(ai); + meshlink_errno = MESHLINK_ENETWORK; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) { - fprintf(stderr, "Could not connect to %s port %s: %s\n", address, port, strerror(errno)); + 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; } - fprintf(stderr, "Connected to %s port %s...\n", address, port); + freeaddrinfo(ai); + + 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. mesh->blen = 0; if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) { - fprintf(stderr, "Error sending request to %s port %s: %s\n", address, port, strerror(errno)); + 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; } + free(b64key); + char hisname[4096] = ""; int code, hismajor, hisminor = 0; 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) { - fprintf(stderr, "Cannot read greeting from peer\n"); + logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n"); closesocket(mesh->sock); + meshlink_errno = MESHLINK_ENETWORK; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } @@ -1219,26 +1760,39 @@ bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { char *fingerprint = mesh->line + 2; char hishash[64]; if(sha512(fingerprint, strlen(fingerprint), hishash)) { - fprintf(stderr, "Could not create hash\n%s\n", mesh->line + 2); + logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2); + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } if(memcmp(hishash, mesh->hash, 18)) { - fprintf(stderr, "Peer has an invalid key!\n%s\n", mesh->line + 2); + 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; } ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint); - if(!hiskey) + if(!hiskey) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } // Start an SPTPS session - if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) + if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) { + meshlink_errno = MESHLINK_EINTERNAL; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } // Feed rest of input buffer to SPTPS - if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) + if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) { + meshlink_errno = MESHLINK_EPEER; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } int len; @@ -1246,12 +1800,17 @@ bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { if(len < 0) { if(errno == EINTR) continue; - fprintf(stderr, "Error reading data from %s port %s: %s\n", address, port, strerror(errno)); + 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; } - if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) + if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) { + meshlink_errno = MESHLINK_EPEER; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; + } } sptps_stop(&mesh->sptps); @@ -1260,23 +1819,37 @@ bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) { closesocket(mesh->sock); if(!mesh->success) { - fprintf(stderr, "Connection closed by peer, invitation cancelled.\n"); + 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->mesh_mutex)); return true; invalid: - fprintf(stderr, "Invalid invitation URL or you are already connected to a Mesh ?\n"); + 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) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + 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) { - fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno)); + 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; } @@ -1288,25 +1861,40 @@ char *meshlink_export(meshlink_handle_t *mesh) { char *buf = xmalloc(len); snprintf(buf, len, "Name = %s\n", mesh->self->name); if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) { - fprintf(stderr, "Error reading from %s: %s\n", filename, strerror(errno)); + 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; } fclose(f); buf[len - 1] = 0; + + pthread_mutex_unlock(&(mesh->mesh_mutex)); return buf; } bool meshlink_import(meshlink_handle_t *mesh, const char *data) { + if(!mesh || !data) { + meshlink_errno = MESHLINK_EINVAL; + return false; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); + if(strncmp(data, "Name = ", 7)) { - fprintf(stderr, "Invalid data\n"); + logger(mesh, MESHLINK_DEBUG, "Invalid data\n"); + meshlink_errno = MESHLINK_EPEER; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } char *end = strchr(data + 7, '\n'); if(!end) { - fprintf(stderr, "Invalid data\n"); + logger(mesh, MESHLINK_DEBUG, "Invalid data\n"); + meshlink_errno = MESHLINK_EPEER; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } @@ -1315,25 +1903,33 @@ bool meshlink_import(meshlink_handle_t *mesh, const char *data) { memcpy(name, data + 7, len); name[len] = 0; if(!check_id(name)) { - fprintf(stderr, "Invalid Name\n"); + logger(mesh, MESHLINK_DEBUG, "Invalid Name\n"); + meshlink_errno = MESHLINK_EPEER; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } char filename[PATH_MAX]; snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name); if(!access(filename, F_OK)) { - fprintf(stderr, "File %s already exists, not importing\n", filename); + logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename); + meshlink_errno = MESHLINK_EEXIST; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } if(errno != ENOENT) { - fprintf(stderr, "Error accessing %s: %s\n", filename, strerror(errno)); + logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno)); + meshlink_errno = MESHLINK_ESTORAGE; + pthread_mutex_unlock(&(mesh->mesh_mutex)); return false; } FILE *f = fopen(filename, "w"); if(!f) { - fprintf(stderr, "Could not create %s: %s\n", filename, strerror(errno)); + 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; } @@ -1342,19 +1938,324 @@ bool meshlink_import(meshlink_handle_t *mesh, const char *data) { load_all_nodes(mesh); + pthread_mutex_unlock(&(mesh->mesh_mutex)); return true; } void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) { - node_t *n; - n = (node_t*)node; - n->status.blacklisted=true; - fprintf(stderr, "Blacklisted %s.\n",node->name); + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + pthread_mutex_lock(&(mesh->mesh_mutex)); + + node_t *n; + n = (node_t*)node; + n->status.blacklisted=true; + logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name); //Make blacklisting persistent in the config file append_config_file(mesh, n->name, "blacklisted", "yes"); - return; + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return; +} + +void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) { + 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 + + pthread_mutex_unlock(&(mesh->mesh_mutex)); + return; +} + +void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) { + mesh->default_blacklist = blacklist; +} + +/* 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; + + // Ignore hints about ourself. + if((node_t *)node == mesh->self) + return; + + pthread_mutex_lock(&(mesh->mesh_mutex)); + + char *host = NULL, *port = NULL, *str = NULL; + sockaddr2str((const sockaddr_t *)addr, &host, &port); + + 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"); + } + + free(str); + free(host); + free(port); + + pthread_mutex_unlock(&(mesh->mesh_mutex)); + // @TODO do we want to fire off a connection attempt right away? +} + +/* 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)) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + 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 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(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; + } + + pthread_mutex_unlock(&(mesh->mesh_mutex)); + + return result; +} + +static bool channel_pre_accept(struct utcp *utcp, uint16_t port) { + //TODO: implement + 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(!channel->receive_cb) + return -1; + else { + channel->receive_cb(mesh, channel, data, len); + 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 ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) { + node_t *n = utcp->priv; + meshlink_handle_t *mesh = n->mesh; + char hex[len * 2 + 1]; + bin2hex(data, hex, len); + logger(mesh, MESHLINK_WARNING, "channel_send(%p, %p, %zu): %s\n", utcp, data, len, hex); + return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? len : -1; +} + +void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_EINVAL; + return; + } + + channel->receive_cb = cb; +} + +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) + abort(); + char hex[len * 2 + 1]; + bin2hex(data, hex, len); + logger(mesh, MESHLINK_WARNING, "channel_receive(%p, %p, %zu): %s\n", n->utcp, data, len, hex); + 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); +} + +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_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) { + if(!mesh) { + meshlink_errno = MESHLINK_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) { + logger(mesh, MESHLINK_WARNING, "utcp_init on node %s", n->name); + n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n); + } + } + pthread_mutex_unlock(&mesh->mesh_mutex); +} + +meshlink_channel_t *meshlink_channel_open(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len) { + if(!mesh || !node) { + meshlink_errno = MESHLINK_EINVAL; + return NULL; + } + + logger(mesh, MESHLINK_WARNING, "meshlink_channel_open(%p, %s, %u, %p, %p, %zu)\n", mesh, node->name, port, cb, data, len); + 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(n->utcp, port, channel_recv, channel); + if(!channel->c) { + meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL; + free(channel); + return NULL; + } + return channel; +} + +void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) { + if(!mesh || !channel) { + meshlink_errno = MESHLINK_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; + } + + utcp_close(channel->c); + free(channel); +} + +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; + } + + if(!len) + return 0; + + if(!data) { + meshlink_errno = MESHLINK_EINVAL; + return -1; + } + + // TODO: more finegrained locking. + // Ideally we want to put the data into the UTCP connection's send buffer. + // Then, preferrably only if there is room in the receiver window, + // kick the meshlink thread to go send packets. + + pthread_mutex_lock(&mesh->mesh_mutex); + ssize_t retval = utcp_send(channel->c, data, len); + pthread_mutex_unlock(&mesh->mesh_mutex); + + if(retval < 0) + meshlink_errno = MESHLINK_ENETWORK; + return retval; +} + +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); } static void __attribute__((constructor)) meshlink_init(void) { @@ -1364,3 +2265,11 @@ static void __attribute__((constructor)) meshlink_init(void) { 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 +};