2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.h"
43 #define MSG_NOSIGNAL 0
45 __thread meshlink_errno_t meshlink_errno;
46 meshlink_log_cb_t global_log_cb;
47 meshlink_log_level_t global_log_level;
49 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
51 static int rstrip(char *value) {
52 int len = strlen(value);
54 while(len && strchr("\t\r\n ", value[len - 1])) {
61 static void get_canonical_address(node_t *n, char **hostname, char **port) {
62 if(!n->canonical_address) {
66 *hostname = xstrdup(n->canonical_address);
67 char *space = strchr(*hostname, ' ');
71 *port = xstrdup(space);
75 static bool is_valid_hostname(const char *hostname) {
80 for(const char *p = hostname; *p; p++) {
81 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
89 static bool is_valid_port(const char *port) {
96 unsigned long int result = strtoul(port, &end, 10);
97 return result && result < 65536 && !*end;
100 for(const char *p = port; *p; p++) {
101 if(!(isalnum(*p) || *p == '-')) {
109 static void set_timeout(int sock, int timeout) {
114 tv.tv_sec = timeout / 1000;
115 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
117 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
118 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
121 struct socket_in_netns_params {
130 static void *socket_in_netns_thread(void *arg) {
131 struct socket_in_netns_params *params = arg;
133 if(setns(params->netns, CLONE_NEWNET) == -1) {
134 meshlink_errno = MESHLINK_EINVAL;
138 params->fd = socket(params->domain, params->type, params->protocol);
144 static int socket_in_netns(int domain, int type, int protocol, int netns) {
146 return socket(domain, type, protocol);
150 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
154 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
155 pthread_join(thr, NULL);
165 // Find out what local address a socket would use if we connect to the given address.
166 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
167 // of both endpoints, but this will actually not send any UDP packet.
168 static bool getlocaladdr(char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
169 struct addrinfo *rai = NULL;
170 const struct addrinfo hint = {
171 .ai_family = AF_UNSPEC,
172 .ai_socktype = SOCK_DGRAM,
173 .ai_protocol = IPPROTO_UDP,
176 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
180 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
187 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
195 if(getsockname(sock, &sa->sa, salen)) {
204 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
206 socklen_t salen = sizeof(sa);
208 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
212 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
219 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
220 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
223 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
224 const char *url = mesh->external_address_url;
227 url = "http://meshlink.io/host.cgi";
230 /* Find the hostname part between the slashes */
231 if(strncmp(url, "http://", 7)) {
233 meshlink_errno = MESHLINK_EINTERNAL;
237 const char *begin = url + 7;
239 const char *end = strchr(begin, '/');
242 end = begin + strlen(begin);
246 char host[end - begin + 1];
247 strncpy(host, begin, end - begin);
248 host[end - begin] = 0;
250 char *port = strchr(host, ':');
256 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
257 struct addrinfo *ai = str2addrinfo(host, port ? port : "80", SOCK_STREAM);
259 char *hostname = NULL;
261 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
262 if(family != AF_UNSPEC && aip->ai_family != family) {
266 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
269 set_timeout(s, 5000);
271 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
278 send(s, "GET ", 4, 0);
279 send(s, url, strlen(url), 0);
280 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
281 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
286 if(line[len - 1] == '\n') {
290 char *p = strrchr(line, '\n');
293 hostname = xstrdup(p + 1);
309 // Check that the hostname is reasonable
310 if(hostname && !is_valid_hostname(hostname)) {
316 meshlink_errno = MESHLINK_ERESOLV;
322 static bool is_localaddr(sockaddr_t *sa) {
323 switch(sa->sa.sa_family) {
325 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
328 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
329 return first == 0 || (first & 0xffc0) == 0xfe80;
337 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
340 // Determine address of the local interface used for outgoing connections.
341 char localaddr[NI_MAXHOST];
342 bool success = false;
344 if(family == AF_INET) {
345 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
346 } else if(family == AF_INET6) {
347 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
350 #ifdef HAVE_GETIFADDRS
353 struct ifaddrs *ifa = NULL;
356 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
357 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
359 if(sa->sa.sa_family != family) {
363 if(is_localaddr(sa)) {
367 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
379 meshlink_errno = MESHLINK_ENETWORK;
383 return xstrdup(localaddr);
386 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
387 for(int i = 0; i < n; i++) {
392 // Ignore duplicate hostnames
395 for(int j = 0; j < i; j++) {
400 if(strcmp(host[i], host[j])) {
404 if(strcmp(port[i], port[j])) {
412 if(found || !is_valid_hostname(host[i])) {
422 // This gets the hostname part for use in invitation URLs
423 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
424 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
426 char *hostname[count];
428 char *hostport = NULL;
430 memset(hostname, 0, sizeof(hostname));
431 memset(port, 0, sizeof(port));
433 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
434 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
437 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
438 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
441 // Add all explicitly set invitation addresses
442 if(mesh->invitation_addresses) {
443 for list_each(char, combo, mesh->invitation_addresses) {
444 hostname[n] = xstrdup(combo);
445 char *slash = strrchr(hostname[n], '/');
449 port[n] = xstrdup(slash + 1);
456 // Add local addresses if requested
457 if(flags & MESHLINK_INVITE_LOCAL) {
458 if(flags & MESHLINK_INVITE_IPV4) {
459 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
462 if(flags & MESHLINK_INVITE_IPV6) {
463 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
467 // Add public/canonical addresses if requested
468 if(flags & MESHLINK_INVITE_PUBLIC) {
469 // Try the CanonicalAddress first
470 get_canonical_address(mesh->self, &hostname[n], &port[n]);
472 if(!hostname[n] && count == 4) {
473 if(flags & MESHLINK_INVITE_IPV4) {
474 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
477 if(flags & MESHLINK_INVITE_IPV6) {
478 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
485 for(int i = 0; i < n; i++) {
486 // Ensure we always have a port number
487 if(hostname[i] && !port[i]) {
488 port[i] = xstrdup(mesh->myport);
492 remove_duplicate_hostnames(hostname, port, n);
494 // Resolve the hostnames
495 for(int i = 0; i < n; i++) {
500 // Convert what we have to a sockaddr
501 struct addrinfo *ai_in, *ai_out;
502 struct addrinfo hint = {
503 .ai_family = AF_UNSPEC,
504 .ai_flags = AI_NUMERICSERV,
505 .ai_socktype = SOCK_STREAM,
507 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
513 // Remember the address(es)
514 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
515 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
518 if(flags & MESHLINK_INVITE_NUMERIC) {
519 // We don't need to do any further conversion
524 // Convert it to a hostname
525 char resolved_host[NI_MAXHOST];
526 char resolved_port[NI_MAXSERV];
527 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
529 if(err || !is_valid_hostname(resolved_host)) {
534 // Convert the hostname back to a sockaddr
535 hint.ai_family = ai_in->ai_family;
536 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
543 // Check if it's still the same sockaddr
544 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
546 freeaddrinfo(ai_out);
550 // Yes: replace the hostname with the resolved one
552 hostname[i] = xstrdup(resolved_host);
555 freeaddrinfo(ai_out);
558 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
559 remove_duplicate_hostnames(hostname, port, n);
561 // Concatenate all unique address to the hostport string
562 for(int i = 0; i < n; i++) {
567 // Append the address to the hostport string
569 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
571 hostport = newhostport;
580 static bool try_bind(meshlink_handle_t *mesh, int port) {
581 struct addrinfo *ai = NULL;
582 struct addrinfo hint = {
583 .ai_flags = AI_PASSIVE,
584 .ai_family = AF_UNSPEC,
585 .ai_socktype = SOCK_STREAM,
586 .ai_protocol = IPPROTO_TCP,
590 snprintf(portstr, sizeof(portstr), "%d", port);
592 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
596 bool success = false;
598 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
599 /* Try to bind to TCP. */
601 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
604 if(errno == EADDRINUSE) {
605 /* If this port is in use for any address family, avoid it. */
613 /* If TCP worked, then we require that UDP works as well. */
615 int udp_fd = setup_udp_listen_socket(mesh, aip);
632 int check_port(meshlink_handle_t *mesh) {
633 for(int i = 0; i < 1000; i++) {
634 int port = 0x1000 + prng(mesh, 0x8000);
636 if(try_bind(mesh, port)) {
638 xasprintf(&mesh->myport, "%d", port);
643 meshlink_errno = MESHLINK_ENETWORK;
644 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
648 static bool write_main_config_files(meshlink_handle_t *mesh) {
649 if(!mesh->confbase) {
655 /* Write the main config file */
656 packmsg_output_t out = {buf, sizeof buf};
658 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
659 packmsg_add_str(&out, mesh->name);
660 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
661 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
662 packmsg_add_uint16(&out, atoi(mesh->myport));
664 if(!packmsg_output_ok(&out)) {
668 config_t config = {buf, packmsg_output_size(&out, buf)};
670 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
674 /* Write our own host config file */
675 if(!node_write_config(mesh, mesh->self)) {
683 meshlink_handle_t *mesh;
685 char cookie[18 + 32];
696 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
697 meshlink_handle_t *mesh = state->mesh;
698 packmsg_input_t in = {buf, len};
699 uint32_t version = packmsg_get_uint32(&in);
701 if(version != MESHLINK_INVITATION_VERSION) {
702 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
706 char *name = packmsg_get_str_dup(&in);
707 packmsg_skip_element(&in); /* submesh */
708 dev_class_t devclass = packmsg_get_int32(&in);
709 uint32_t count = packmsg_get_array(&in);
712 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
716 if(!check_id(name)) {
717 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
723 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
729 free(mesh->self->name);
731 mesh->self->name = xstrdup(name);
732 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
734 // Initialize configuration directory
735 if(!config_init(mesh, "current")) {
739 if(!write_main_config_files(mesh)) {
743 // Write host config files
744 for(uint32_t i = 0; i < count; i++) {
746 uint32_t len = packmsg_get_bin_raw(&in, &data);
749 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
753 packmsg_input_t in2 = {data, len};
754 uint32_t version = packmsg_get_uint32(&in2);
755 char *name = packmsg_get_str_dup(&in2);
757 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
759 packmsg_input_invalidate(&in);
763 if(!check_id(name)) {
768 if(!strcmp(name, mesh->name)) {
769 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
771 meshlink_errno = MESHLINK_EPEER;
775 node_t *n = new_node();
778 config_t config = {data, len};
780 if(!node_read_from_config(mesh, n, &config)) {
782 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
783 meshlink_errno = MESHLINK_EPEER;
788 /* The first host config file is of the inviter itself;
789 * remember the address we are currently using for the invitation connection.
792 socklen_t salen = sizeof(sa);
794 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
795 node_add_recent_address(mesh, n, &sa);
799 /* Clear the reachability times, since we ourself have never seen these nodes yet */
800 n->last_reachable = 0;
801 n->last_unreachable = 0;
803 if(!node_write_config(mesh, n)) {
811 /* Ensure the configuration directory metadata is on disk */
812 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
816 if(!mesh->inviter_commits_first) {
817 devtool_set_inviter_commits_first(false);
820 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
822 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
827 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
829 join_state_t *state = handle;
830 const char *ptr = data;
833 int result = send(state->sock, ptr, len, 0);
835 if(result == -1 && errno == EINTR) {
837 } else if(result <= 0) {
848 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
849 join_state_t *state = handle;
850 meshlink_handle_t *mesh = state->mesh;
852 if(mesh->inviter_commits_first) {
854 case SPTPS_HANDSHAKE:
855 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
861 if(!finalize_join(state, msg, len)) {
865 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
866 shutdown(state->sock, SHUT_RDWR);
867 state->success = true;
875 case SPTPS_HANDSHAKE:
876 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
879 return finalize_join(state, msg, len);
882 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
883 shutdown(state->sock, SHUT_RDWR);
884 state->success = true;
895 static bool recvline(join_state_t *state) {
896 char *newline = NULL;
898 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
899 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
901 if(result == -1 && errno == EINTR) {
903 } else if(result <= 0) {
907 state->blen += result;
910 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
914 size_t len = newline - state->buffer;
916 memcpy(state->line, state->buffer, len);
917 state->line[len] = 0;
918 memmove(state->buffer, newline + 1, state->blen - len - 1);
919 state->blen -= len + 1;
924 static bool sendline(int fd, char *format, ...) {
930 va_start(ap, format);
931 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
934 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
942 int result = send(fd, p, blen, MSG_NOSIGNAL);
944 if(result == -1 && errno == EINTR) {
946 } else if(result <= 0) {
957 static const char *errstr[] = {
958 [MESHLINK_OK] = "No error",
959 [MESHLINK_EINVAL] = "Invalid argument",
960 [MESHLINK_ENOMEM] = "Out of memory",
961 [MESHLINK_ENOENT] = "No such node",
962 [MESHLINK_EEXIST] = "Node already exists",
963 [MESHLINK_EINTERNAL] = "Internal error",
964 [MESHLINK_ERESOLV] = "Could not resolve hostname",
965 [MESHLINK_ESTORAGE] = "Storage error",
966 [MESHLINK_ENETWORK] = "Network error",
967 [MESHLINK_EPEER] = "Error communicating with peer",
968 [MESHLINK_ENOTSUP] = "Operation not supported",
969 [MESHLINK_EBUSY] = "MeshLink instance already in use",
970 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
973 const char *meshlink_strerror(meshlink_errno_t err) {
974 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
975 return "Invalid error code";
981 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
982 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
984 mesh->private_key = ecdsa_generate();
985 mesh->invitation_key = ecdsa_generate();
987 if(!mesh->private_key || !mesh->invitation_key) {
988 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
989 meshlink_errno = MESHLINK_EINTERNAL;
993 logger(mesh, MESHLINK_DEBUG, "Done.\n");
998 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
999 if(a->tv_sec == b->tv_sec) {
1000 return a->tv_nsec < b->tv_nsec;
1002 return a->tv_sec < b->tv_sec;
1006 static struct timespec idle(event_loop_t *loop, void *data) {
1008 meshlink_handle_t *mesh = data;
1009 struct timespec t, tmin = {3600, 0};
1011 for splay_each(node_t, n, mesh->nodes) {
1016 t = utcp_timeout(n->utcp);
1018 if(timespec_lt(&t, &tmin)) {
1026 // Get our local address(es) by simulating connecting to an Internet host.
1027 static void add_local_addresses(meshlink_handle_t *mesh) {
1029 sa.storage.ss_family = AF_UNKNOWN;
1030 socklen_t salen = sizeof(sa);
1034 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1035 sa.in.sin_port = ntohs(atoi(mesh->myport));
1036 node_add_recent_address(mesh, mesh->self, &sa);
1043 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1044 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1045 node_add_recent_address(mesh, mesh->self, &sa);
1049 static bool meshlink_setup(meshlink_handle_t *mesh) {
1050 if(!config_destroy(mesh->confbase, "new")) {
1051 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1052 meshlink_errno = MESHLINK_ESTORAGE;
1056 if(!config_destroy(mesh->confbase, "old")) {
1057 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1058 meshlink_errno = MESHLINK_ESTORAGE;
1062 if(!config_init(mesh, "current")) {
1063 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1064 meshlink_errno = MESHLINK_ESTORAGE;
1068 if(!ecdsa_keygen(mesh)) {
1069 meshlink_errno = MESHLINK_EINTERNAL;
1073 if(check_port(mesh) == 0) {
1074 meshlink_errno = MESHLINK_ENETWORK;
1078 /* Create a node for ourself */
1080 mesh->self = new_node();
1081 mesh->self->name = xstrdup(mesh->name);
1082 mesh->self->devclass = mesh->devclass;
1083 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1084 mesh->self->session_id = mesh->session_id;
1086 if(!write_main_config_files(mesh)) {
1087 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1088 meshlink_errno = MESHLINK_ESTORAGE;
1092 /* Ensure the configuration directory metadata is on disk */
1093 if(!config_sync(mesh, "current")) {
1100 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1103 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1104 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1108 packmsg_input_t in = {config.buf, config.len};
1109 const void *private_key;
1110 const void *invitation_key;
1112 uint32_t version = packmsg_get_uint32(&in);
1113 char *name = packmsg_get_str_dup(&in);
1114 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1115 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1116 uint16_t myport = packmsg_get_uint16(&in);
1118 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1119 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1121 config_free(&config);
1127 // TODO: check this?
1128 if(mesh->name && strcmp(mesh->name, name)) {
1129 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1130 meshlink_errno = MESHLINK_ESTORAGE;
1132 config_free(&config);
1140 xasprintf(&mesh->myport, "%u", myport);
1141 mesh->private_key = ecdsa_set_private_key(private_key);
1142 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1143 config_free(&config);
1145 /* Create a node for ourself and read our host configuration file */
1147 mesh->self = new_node();
1148 mesh->self->name = xstrdup(name);
1149 mesh->self->devclass = mesh->devclass;
1150 mesh->self->session_id = mesh->session_id;
1152 if(!node_read_public_key(mesh, mesh->self)) {
1153 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1154 meshlink_errno = MESHLINK_ESTORAGE;
1155 free_node(mesh->self);
1164 static void *setup_network_in_netns_thread(void *arg) {
1165 meshlink_handle_t *mesh = arg;
1167 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1171 bool success = setup_network(mesh);
1172 return success ? arg : NULL;
1174 #endif // HAVE_SETNS
1176 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1177 if(!confbase || !*confbase) {
1178 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1179 meshlink_errno = MESHLINK_EINVAL;
1183 if(!appname || !*appname) {
1184 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1185 meshlink_errno = MESHLINK_EINVAL;
1189 if(strchr(appname, ' ')) {
1190 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1191 meshlink_errno = MESHLINK_EINVAL;
1195 if(!name || !*name) {
1196 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1197 meshlink_errno = MESHLINK_EINVAL;
1201 if(!check_id(name)) {
1202 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1203 meshlink_errno = MESHLINK_EINVAL;
1207 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1208 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1209 meshlink_errno = MESHLINK_EINVAL;
1213 meshlink_open_params_t *params = xzalloc(sizeof * params);
1215 params->confbase = xstrdup(confbase);
1216 params->name = xstrdup(name);
1217 params->appname = xstrdup(appname);
1218 params->devclass = devclass;
1224 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1226 meshlink_errno = MESHLINK_EINVAL;
1230 params->netns = netns;
1235 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1237 meshlink_errno = MESHLINK_EINVAL;
1241 if((!key && keylen) || (key && !keylen)) {
1242 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1243 meshlink_errno = MESHLINK_EINVAL;
1248 params->keylen = keylen;
1253 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1254 if(!mesh || !new_key || !new_keylen) {
1255 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1256 meshlink_errno = MESHLINK_EINVAL;
1260 pthread_mutex_lock(&mesh->mutex);
1262 // Create hash for the new key
1263 void *new_config_key;
1264 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1266 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1267 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1268 meshlink_errno = MESHLINK_EINTERNAL;
1269 pthread_mutex_unlock(&mesh->mutex);
1273 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1275 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1276 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1277 meshlink_errno = MESHLINK_ESTORAGE;
1278 pthread_mutex_unlock(&mesh->mutex);
1282 devtool_keyrotate_probe(1);
1284 // Rename confbase/current/ to confbase/old
1286 if(!config_rename(mesh, "current", "old")) {
1287 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1288 meshlink_errno = MESHLINK_ESTORAGE;
1289 pthread_mutex_unlock(&mesh->mutex);
1293 devtool_keyrotate_probe(2);
1295 // Rename confbase/new/ to confbase/current
1297 if(!config_rename(mesh, "new", "current")) {
1298 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1299 meshlink_errno = MESHLINK_ESTORAGE;
1300 pthread_mutex_unlock(&mesh->mutex);
1304 devtool_keyrotate_probe(3);
1306 // Cleanup the "old" confbase sub-directory
1308 if(!config_destroy(mesh->confbase, "old")) {
1309 pthread_mutex_unlock(&mesh->mutex);
1313 // Change the mesh handle key with new key
1315 free(mesh->config_key);
1316 mesh->config_key = new_config_key;
1318 pthread_mutex_unlock(&mesh->mutex);
1323 void meshlink_open_params_free(meshlink_open_params_t *params) {
1325 meshlink_errno = MESHLINK_EINVAL;
1329 free(params->confbase);
1331 free(params->appname);
1336 /// Device class traits
1337 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1338 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1339 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1340 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1341 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1344 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1345 if(!confbase || !*confbase) {
1346 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1347 meshlink_errno = MESHLINK_EINVAL;
1351 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1352 meshlink_open_params_t params;
1353 memset(¶ms, 0, sizeof(params));
1355 params.confbase = (char *)confbase;
1356 params.name = (char *)name;
1357 params.appname = (char *)appname;
1358 params.devclass = devclass;
1361 return meshlink_open_ex(¶ms);
1364 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) {
1365 if(!confbase || !*confbase) {
1366 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1367 meshlink_errno = MESHLINK_EINVAL;
1371 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1372 meshlink_open_params_t params;
1373 memset(¶ms, 0, sizeof(params));
1375 params.confbase = (char *)confbase;
1376 params.name = (char *)name;
1377 params.appname = (char *)appname;
1378 params.devclass = devclass;
1381 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1385 return meshlink_open_ex(¶ms);
1388 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1389 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1390 meshlink_open_params_t params;
1391 memset(¶ms, 0, sizeof(params));
1393 params.name = (char *)name;
1394 params.appname = (char *)appname;
1395 params.devclass = devclass;
1398 return meshlink_open_ex(¶ms);
1401 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1402 // Validate arguments provided by the application
1403 bool usingname = false;
1405 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1407 if(!params->appname || !*params->appname) {
1408 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1409 meshlink_errno = MESHLINK_EINVAL;
1413 if(strchr(params->appname, ' ')) {
1414 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1415 meshlink_errno = MESHLINK_EINVAL;
1419 if(!params->name || !*params->name) {
1420 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1422 } else { //check name only if there is a name != NULL
1424 if(!check_id(params->name)) {
1425 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1426 meshlink_errno = MESHLINK_EINVAL;
1433 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1434 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1435 meshlink_errno = MESHLINK_EINVAL;
1439 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1440 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1441 meshlink_errno = MESHLINK_EINVAL;
1445 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1447 if(params->confbase) {
1448 mesh->confbase = xstrdup(params->confbase);
1451 mesh->appname = xstrdup(params->appname);
1452 mesh->devclass = params->devclass;
1453 mesh->discovery = true;
1454 mesh->invitation_timeout = 604800; // 1 week
1455 mesh->netns = params->netns;
1456 mesh->submeshes = NULL;
1457 mesh->log_cb = global_log_cb;
1458 mesh->log_level = global_log_level;
1460 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1463 randomize(&mesh->session_id, sizeof(mesh->session_id));
1464 } while(mesh->session_id == 0);
1466 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1469 mesh->name = xstrdup(params->name);
1474 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1476 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1477 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1478 meshlink_close(mesh);
1479 meshlink_errno = MESHLINK_EINTERNAL;
1485 pthread_mutexattr_t attr;
1486 pthread_mutexattr_init(&attr);
1487 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1488 pthread_mutex_init(&mesh->mutex, &attr);
1490 mesh->threadstarted = false;
1491 event_loop_init(&mesh->loop);
1492 mesh->loop.data = mesh;
1494 meshlink_queue_init(&mesh->outpacketqueue);
1496 // Atomically lock the configuration directory.
1497 if(!main_config_lock(mesh)) {
1498 meshlink_close(mesh);
1502 // If no configuration exists yet, create it.
1504 if(!meshlink_confbase_exists(mesh)) {
1505 if(!meshlink_setup(mesh)) {
1506 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1507 meshlink_close(mesh);
1511 if(!meshlink_read_config(mesh)) {
1512 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1513 meshlink_close(mesh);
1519 struct WSAData wsa_state;
1520 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1523 // Setup up everything
1524 // TODO: we should not open listening sockets yet
1526 bool success = false;
1528 if(mesh->netns != -1) {
1532 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1533 void *retval = NULL;
1534 success = pthread_join(thr, &retval) == 0 && retval;
1538 meshlink_errno = MESHLINK_EINTERNAL;
1541 #endif // HAVE_SETNS
1543 success = setup_network(mesh);
1547 meshlink_close(mesh);
1548 meshlink_errno = MESHLINK_ENETWORK;
1552 add_local_addresses(mesh);
1554 if(!node_write_config(mesh, mesh->self)) {
1555 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1559 idle_set(&mesh->loop, idle, mesh);
1561 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1565 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1566 meshlink_submesh_t *s = NULL;
1569 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1570 meshlink_errno = MESHLINK_EINVAL;
1574 if(!submesh || !*submesh) {
1575 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1576 meshlink_errno = MESHLINK_EINVAL;
1581 pthread_mutex_lock(&mesh->mutex);
1583 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1585 pthread_mutex_unlock(&mesh->mutex);
1590 static void *meshlink_main_loop(void *arg) {
1591 meshlink_handle_t *mesh = arg;
1593 if(mesh->netns != -1) {
1596 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1597 pthread_cond_signal(&mesh->cond);
1602 pthread_cond_signal(&mesh->cond);
1604 #endif // HAVE_SETNS
1609 if(mesh->discovery) {
1610 discovery_start(mesh);
1615 pthread_mutex_lock(&mesh->mutex);
1617 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1618 pthread_cond_broadcast(&mesh->cond);
1620 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1622 pthread_mutex_unlock(&mesh->mutex);
1627 if(mesh->discovery) {
1628 discovery_stop(mesh);
1636 bool meshlink_start(meshlink_handle_t *mesh) {
1638 meshlink_errno = MESHLINK_EINVAL;
1642 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1644 pthread_mutex_lock(&mesh->mutex);
1647 assert(mesh->private_key);
1648 assert(mesh->self->ecdsa);
1649 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1651 if(mesh->threadstarted) {
1652 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1653 pthread_mutex_unlock(&mesh->mutex);
1657 if(mesh->listen_socket[0].tcp.fd < 0) {
1658 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1659 meshlink_errno = MESHLINK_ENETWORK;
1663 // TODO: open listening sockets first
1665 //Check that a valid name is set
1667 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1668 meshlink_errno = MESHLINK_EINVAL;
1669 pthread_mutex_unlock(&mesh->mutex);
1673 init_outgoings(mesh);
1675 // Start the main thread
1677 event_loop_start(&mesh->loop);
1679 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1680 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1681 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1682 meshlink_errno = MESHLINK_EINTERNAL;
1683 event_loop_stop(&mesh->loop);
1684 pthread_mutex_unlock(&mesh->mutex);
1688 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1689 mesh->threadstarted = true;
1691 // Ensure we are considered reachable
1694 pthread_mutex_unlock(&mesh->mutex);
1698 void meshlink_stop(meshlink_handle_t *mesh) {
1700 meshlink_errno = MESHLINK_EINVAL;
1704 pthread_mutex_lock(&mesh->mutex);
1705 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1707 // Shut down the main thread
1708 event_loop_stop(&mesh->loop);
1710 // Send ourselves a UDP packet to kick the event loop
1711 for(int i = 0; i < mesh->listen_sockets; i++) {
1713 socklen_t salen = sizeof(sa);
1715 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1716 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1720 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1721 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1725 if(mesh->threadstarted) {
1726 // Wait for the main thread to finish
1727 pthread_mutex_unlock(&mesh->mutex);
1728 pthread_join(mesh->thread, NULL);
1729 pthread_mutex_lock(&mesh->mutex);
1731 mesh->threadstarted = false;
1734 // Close all metaconnections
1735 if(mesh->connections) {
1736 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1738 connection_t *c = node->data;
1740 terminate_connection(mesh, c, false);
1744 exit_outgoings(mesh);
1746 // Ensure we are considered unreachable
1751 // Try to write out any changed node config files, ignore errors at this point.
1753 for splay_each(node_t, n, mesh->nodes) {
1754 if(n->status.dirty) {
1755 n->status.dirty = !node_write_config(mesh, n);
1760 pthread_mutex_unlock(&mesh->mutex);
1763 void meshlink_close(meshlink_handle_t *mesh) {
1765 meshlink_errno = MESHLINK_EINVAL;
1769 // stop can be called even if mesh has not been started
1770 meshlink_stop(mesh);
1772 // lock is not released after this
1773 pthread_mutex_lock(&mesh->mutex);
1775 // Close and free all resources used.
1777 close_network_connections(mesh);
1779 logger(mesh, MESHLINK_INFO, "Terminating");
1781 event_loop_exit(&mesh->loop);
1785 if(mesh->confbase) {
1791 ecdsa_free(mesh->invitation_key);
1793 if(mesh->netns != -1) {
1797 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1801 meshlink_queue_exit(&mesh->outpacketqueue);
1804 free(mesh->appname);
1805 free(mesh->confbase);
1806 free(mesh->config_key);
1807 free(mesh->external_address_url);
1808 ecdsa_free(mesh->private_key);
1810 if(mesh->invitation_addresses) {
1811 list_delete_list(mesh->invitation_addresses);
1814 main_config_unlock(mesh);
1816 pthread_mutex_unlock(&mesh->mutex);
1817 pthread_mutex_destroy(&mesh->mutex);
1819 memset(mesh, 0, sizeof(*mesh));
1824 bool meshlink_destroy(const char *confbase) {
1826 meshlink_errno = MESHLINK_EINVAL;
1830 /* Exit early if the confbase directory itself doesn't exist */
1831 if(access(confbase, F_OK) && errno == ENOENT) {
1835 /* Take the lock the same way meshlink_open() would. */
1836 char lockfilename[PATH_MAX];
1837 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1839 FILE *lockfile = fopen(lockfilename, "w+");
1842 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1843 meshlink_errno = MESHLINK_ESTORAGE;
1848 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1852 // TODO: use _locking()?
1855 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1856 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1858 meshlink_errno = MESHLINK_EBUSY;
1864 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1865 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1869 if(unlink(lockfilename)) {
1870 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1872 meshlink_errno = MESHLINK_ESTORAGE;
1878 if(!sync_path(confbase)) {
1879 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1880 meshlink_errno = MESHLINK_ESTORAGE;
1887 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1889 meshlink_errno = MESHLINK_EINVAL;
1893 pthread_mutex_lock(&mesh->mutex);
1894 mesh->receive_cb = cb;
1895 pthread_mutex_unlock(&mesh->mutex);
1898 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1900 meshlink_errno = MESHLINK_EINVAL;
1904 pthread_mutex_lock(&mesh->mutex);
1905 mesh->connection_try_cb = cb;
1906 pthread_mutex_unlock(&mesh->mutex);
1909 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1911 meshlink_errno = MESHLINK_EINVAL;
1915 pthread_mutex_lock(&mesh->mutex);
1916 mesh->node_status_cb = cb;
1917 pthread_mutex_unlock(&mesh->mutex);
1920 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1922 meshlink_errno = MESHLINK_EINVAL;
1926 pthread_mutex_lock(&mesh->mutex);
1927 mesh->node_pmtu_cb = cb;
1928 pthread_mutex_unlock(&mesh->mutex);
1931 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1933 meshlink_errno = MESHLINK_EINVAL;
1937 pthread_mutex_lock(&mesh->mutex);
1938 mesh->node_duplicate_cb = cb;
1939 pthread_mutex_unlock(&mesh->mutex);
1942 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1944 pthread_mutex_lock(&mesh->mutex);
1946 mesh->log_level = cb ? level : 0;
1947 pthread_mutex_unlock(&mesh->mutex);
1950 global_log_level = cb ? level : 0;
1954 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1956 meshlink_errno = MESHLINK_EINVAL;
1960 pthread_mutex_lock(&mesh->mutex);
1961 mesh->error_cb = cb;
1962 pthread_mutex_unlock(&mesh->mutex);
1965 static vpn_packet_t *prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1966 meshlink_packethdr_t *hdr;
1968 if(len >= MAXSIZE - sizeof(*hdr)) {
1969 meshlink_errno = MESHLINK_EINVAL;
1973 node_t *n = (node_t *)destination;
1975 if(n->status.blacklisted) {
1976 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1977 meshlink_errno = MESHLINK_EBLACKLISTED;
1981 // Prepare the packet
1982 vpn_packet_t *packet = malloc(sizeof(*packet));
1985 meshlink_errno = MESHLINK_ENOMEM;
1989 packet->probe = false;
1990 packet->tcp = false;
1991 packet->len = len + sizeof(*hdr);
1993 hdr = (meshlink_packethdr_t *)packet->data;
1994 memset(hdr, 0, sizeof(*hdr));
1995 // leave the last byte as 0 to make sure strings are always
1996 // null-terminated if they are longer than the buffer
1997 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1998 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
2000 memcpy(packet->data + sizeof(*hdr), data, len);
2005 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2007 assert(destination);
2011 // Prepare the packet
2012 vpn_packet_t *packet = prepare_packet(mesh, destination, data, len);
2018 // Send it immediately
2019 route(mesh, mesh->self, packet);
2025 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2026 // Validate arguments
2027 if(!mesh || !destination) {
2028 meshlink_errno = MESHLINK_EINVAL;
2037 meshlink_errno = MESHLINK_EINVAL;
2041 // Prepare the packet
2042 vpn_packet_t *packet = prepare_packet(mesh, destination, data, len);
2049 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2051 meshlink_errno = MESHLINK_ENOMEM;
2055 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2057 // Notify event loop
2058 signal_trigger(&mesh->loop, &mesh->datafromapp);
2063 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2065 meshlink_handle_t *mesh = data;
2067 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2069 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2070 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2071 mesh->self->in_packets++;
2072 mesh->self->in_bytes += packet->len;
2073 route(mesh, mesh->self, packet);
2078 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2079 if(!mesh || !destination) {
2080 meshlink_errno = MESHLINK_EINVAL;
2084 pthread_mutex_lock(&mesh->mutex);
2086 node_t *n = (node_t *)destination;
2088 if(!n->status.reachable) {
2089 pthread_mutex_unlock(&mesh->mutex);
2092 } else if(n->mtuprobes > 30 && n->minmtu) {
2093 pthread_mutex_unlock(&mesh->mutex);
2096 pthread_mutex_unlock(&mesh->mutex);
2101 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2102 if(!mesh || !node) {
2103 meshlink_errno = MESHLINK_EINVAL;
2107 pthread_mutex_lock(&mesh->mutex);
2109 node_t *n = (node_t *)node;
2111 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2112 meshlink_errno = MESHLINK_EINTERNAL;
2113 pthread_mutex_unlock(&mesh->mutex);
2117 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2120 meshlink_errno = MESHLINK_EINTERNAL;
2123 pthread_mutex_unlock(&mesh->mutex);
2127 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2129 meshlink_errno = MESHLINK_EINVAL;
2133 return (meshlink_node_t *)mesh->self;
2136 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2137 if(!mesh || !name) {
2138 meshlink_errno = MESHLINK_EINVAL;
2144 pthread_mutex_lock(&mesh->mutex);
2145 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2146 pthread_mutex_unlock(&mesh->mutex);
2149 meshlink_errno = MESHLINK_ENOENT;
2152 return (meshlink_node_t *)n;
2155 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2156 if(!mesh || !name) {
2157 meshlink_errno = MESHLINK_EINVAL;
2161 meshlink_submesh_t *submesh = NULL;
2163 pthread_mutex_lock(&mesh->mutex);
2164 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2165 pthread_mutex_unlock(&mesh->mutex);
2168 meshlink_errno = MESHLINK_ENOENT;
2174 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2175 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2176 meshlink_errno = MESHLINK_EINVAL;
2180 meshlink_node_t **result;
2183 pthread_mutex_lock(&mesh->mutex);
2185 *nmemb = mesh->nodes->count;
2186 result = realloc(nodes, *nmemb * sizeof(*nodes));
2189 meshlink_node_t **p = result;
2191 for splay_each(node_t, n, mesh->nodes) {
2192 *p++ = (meshlink_node_t *)n;
2197 meshlink_errno = MESHLINK_ENOMEM;
2200 pthread_mutex_unlock(&mesh->mutex);
2205 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) {
2206 meshlink_node_t **result;
2208 pthread_mutex_lock(&mesh->mutex);
2212 for splay_each(node_t, n, mesh->nodes) {
2213 if(search_node(n, condition)) {
2220 pthread_mutex_unlock(&mesh->mutex);
2224 result = realloc(nodes, *nmemb * sizeof(*nodes));
2227 meshlink_node_t **p = result;
2229 for splay_each(node_t, n, mesh->nodes) {
2230 if(search_node(n, condition)) {
2231 *p++ = (meshlink_node_t *)n;
2237 meshlink_errno = MESHLINK_ENOMEM;
2240 pthread_mutex_unlock(&mesh->mutex);
2245 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2246 dev_class_t *devclass = (dev_class_t *)condition;
2248 if(*devclass == (dev_class_t)node->devclass) {
2255 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2256 if(condition == node->submesh) {
2268 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2269 const struct time_range *range = condition;
2270 time_t start = node->last_reachable;
2271 time_t end = node->last_unreachable;
2281 if(range->end >= range->start) {
2282 return start <= range->end && end >= range->start;
2284 return start > range->start || end < range->end;
2288 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) {
2289 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2290 meshlink_errno = MESHLINK_EINVAL;
2294 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2297 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2298 if(!mesh || !submesh || !nmemb) {
2299 meshlink_errno = MESHLINK_EINVAL;
2303 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2306 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) {
2307 if(!mesh || !nmemb) {
2308 meshlink_errno = MESHLINK_EINVAL;
2312 struct time_range range = {start, end};
2314 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2317 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2318 if(!mesh || !node) {
2319 meshlink_errno = MESHLINK_EINVAL;
2323 dev_class_t devclass;
2325 pthread_mutex_lock(&mesh->mutex);
2327 devclass = ((node_t *)node)->devclass;
2329 pthread_mutex_unlock(&mesh->mutex);
2334 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2335 if(!mesh || !node) {
2336 meshlink_errno = MESHLINK_EINVAL;
2340 node_t *n = (node_t *)node;
2342 meshlink_submesh_t *s;
2344 s = (meshlink_submesh_t *)n->submesh;
2349 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2350 if(!mesh || !node) {
2351 meshlink_errno = MESHLINK_EINVAL;
2355 node_t *n = (node_t *)node;
2358 pthread_mutex_lock(&mesh->mutex);
2359 reachable = n->status.reachable && !n->status.blacklisted;
2361 if(last_reachable) {
2362 *last_reachable = n->last_reachable;
2365 if(last_unreachable) {
2366 *last_unreachable = n->last_unreachable;
2369 pthread_mutex_unlock(&mesh->mutex);
2374 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2375 if(!mesh || !data || !len || !signature || !siglen) {
2376 meshlink_errno = MESHLINK_EINVAL;
2380 if(*siglen < MESHLINK_SIGLEN) {
2381 meshlink_errno = MESHLINK_EINVAL;
2385 pthread_mutex_lock(&mesh->mutex);
2387 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2388 meshlink_errno = MESHLINK_EINTERNAL;
2389 pthread_mutex_unlock(&mesh->mutex);
2393 *siglen = MESHLINK_SIGLEN;
2394 pthread_mutex_unlock(&mesh->mutex);
2398 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2399 if(!mesh || !source || !data || !len || !signature) {
2400 meshlink_errno = MESHLINK_EINVAL;
2404 if(siglen != MESHLINK_SIGLEN) {
2405 meshlink_errno = MESHLINK_EINVAL;
2409 pthread_mutex_lock(&mesh->mutex);
2413 struct node_t *n = (struct node_t *)source;
2415 if(!node_read_public_key(mesh, n)) {
2416 meshlink_errno = MESHLINK_EINTERNAL;
2419 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2422 pthread_mutex_unlock(&mesh->mutex);
2426 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2427 pthread_mutex_lock(&mesh->mutex);
2429 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2432 // TODO: Update invitation key if necessary?
2435 pthread_mutex_unlock(&mesh->mutex);
2437 return mesh->invitation_key;
2440 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2441 if(!mesh || !node || !address) {
2442 meshlink_errno = MESHLINK_EINVAL;
2446 if(!is_valid_hostname(address)) {
2447 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2448 meshlink_errno = MESHLINK_EINVAL;
2452 if(port && !is_valid_port(port)) {
2453 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2454 meshlink_errno = MESHLINK_EINVAL;
2458 char *canonical_address;
2461 xasprintf(&canonical_address, "%s %s", address, port);
2463 canonical_address = xstrdup(address);
2466 pthread_mutex_lock(&mesh->mutex);
2468 node_t *n = (node_t *)node;
2469 free(n->canonical_address);
2470 n->canonical_address = canonical_address;
2472 if(!node_write_config(mesh, n)) {
2473 pthread_mutex_unlock(&mesh->mutex);
2477 pthread_mutex_unlock(&mesh->mutex);
2479 return config_sync(mesh, "current");
2482 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2483 if(!mesh || !address) {
2484 meshlink_errno = MESHLINK_EINVAL;
2488 if(!is_valid_hostname(address)) {
2489 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2490 meshlink_errno = MESHLINK_EINVAL;
2494 if(port && !is_valid_port(port)) {
2495 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2496 meshlink_errno = MESHLINK_EINVAL;
2503 xasprintf(&combo, "%s/%s", address, port);
2505 combo = xstrdup(address);
2508 pthread_mutex_lock(&mesh->mutex);
2510 if(!mesh->invitation_addresses) {
2511 mesh->invitation_addresses = list_alloc((list_action_t)free);
2514 list_insert_tail(mesh->invitation_addresses, combo);
2515 pthread_mutex_unlock(&mesh->mutex);
2520 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2522 meshlink_errno = MESHLINK_EINVAL;
2526 pthread_mutex_lock(&mesh->mutex);
2528 if(mesh->invitation_addresses) {
2529 list_delete_list(mesh->invitation_addresses);
2530 mesh->invitation_addresses = NULL;
2533 pthread_mutex_unlock(&mesh->mutex);
2536 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2537 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2540 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2542 meshlink_errno = MESHLINK_EINVAL;
2546 char *address = meshlink_get_external_address(mesh);
2552 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2558 int meshlink_get_port(meshlink_handle_t *mesh) {
2560 meshlink_errno = MESHLINK_EINVAL;
2565 meshlink_errno = MESHLINK_EINTERNAL;
2571 pthread_mutex_lock(&mesh->mutex);
2572 port = atoi(mesh->myport);
2573 pthread_mutex_unlock(&mesh->mutex);
2578 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2579 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2580 meshlink_errno = MESHLINK_EINVAL;
2584 if(mesh->myport && port == atoi(mesh->myport)) {
2588 if(!try_bind(mesh, port)) {
2589 meshlink_errno = MESHLINK_ENETWORK;
2593 devtool_trybind_probe();
2597 pthread_mutex_lock(&mesh->mutex);
2599 if(mesh->threadstarted) {
2600 meshlink_errno = MESHLINK_EINVAL;
2605 xasprintf(&mesh->myport, "%d", port);
2607 /* Close down the network. This also deletes mesh->self. */
2608 close_network_connections(mesh);
2610 /* Recreate mesh->self. */
2611 mesh->self = new_node();
2612 mesh->self->name = xstrdup(mesh->name);
2613 mesh->self->devclass = mesh->devclass;
2614 mesh->self->session_id = mesh->session_id;
2615 xasprintf(&mesh->myport, "%d", port);
2617 if(!node_read_public_key(mesh, mesh->self)) {
2618 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2619 meshlink_errno = MESHLINK_ESTORAGE;
2620 free_node(mesh->self);
2623 } else if(!setup_network(mesh)) {
2624 meshlink_errno = MESHLINK_ENETWORK;
2628 /* Rebuild our own list of recent addresses */
2629 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2630 add_local_addresses(mesh);
2632 /* Write meshlink.conf with the updated port number */
2633 write_main_config_files(mesh);
2635 rval = config_sync(mesh, "current");
2638 pthread_mutex_unlock(&mesh->mutex);
2640 return rval && meshlink_get_port(mesh) == port;
2643 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2644 mesh->invitation_timeout = timeout;
2647 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2648 meshlink_submesh_t *s = NULL;
2651 meshlink_errno = MESHLINK_EINVAL;
2656 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2659 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2660 meshlink_errno = MESHLINK_EINVAL;
2664 s = (meshlink_submesh_t *)mesh->self->submesh;
2667 pthread_mutex_lock(&mesh->mutex);
2669 // Check validity of the new node's name
2670 if(!check_id(name)) {
2671 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2672 meshlink_errno = MESHLINK_EINVAL;
2673 pthread_mutex_unlock(&mesh->mutex);
2677 // Ensure no host configuration file with that name exists
2678 if(config_exists(mesh, "current", name)) {
2679 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2680 meshlink_errno = MESHLINK_EEXIST;
2681 pthread_mutex_unlock(&mesh->mutex);
2685 // Ensure no other nodes know about this name
2686 if(lookup_node(mesh, name)) {
2687 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2688 meshlink_errno = MESHLINK_EEXIST;
2689 pthread_mutex_unlock(&mesh->mutex);
2693 // Get the local address
2694 char *address = get_my_hostname(mesh, flags);
2697 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2698 meshlink_errno = MESHLINK_ERESOLV;
2699 pthread_mutex_unlock(&mesh->mutex);
2703 if(!refresh_invitation_key(mesh)) {
2704 meshlink_errno = MESHLINK_EINTERNAL;
2705 pthread_mutex_unlock(&mesh->mutex);
2709 // If we changed our own host config file, write it out now
2710 if(mesh->self->status.dirty) {
2711 if(!node_write_config(mesh, mesh->self)) {
2712 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2713 pthread_mutex_unlock(&mesh->mutex);
2720 // Create a hash of the key.
2721 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2722 sha512(fingerprint, strlen(fingerprint), hash);
2723 b64encode_urlsafe(hash, hash, 18);
2725 // Create a random cookie for this invitation.
2727 randomize(cookie, 18);
2729 // Create a filename that doesn't reveal the cookie itself
2730 char buf[18 + strlen(fingerprint)];
2731 char cookiehash[64];
2732 memcpy(buf, cookie, 18);
2733 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2734 sha512(buf, sizeof(buf), cookiehash);
2735 b64encode_urlsafe(cookiehash, cookiehash, 18);
2737 b64encode_urlsafe(cookie, cookie, 18);
2741 /* Construct the invitation file */
2742 uint8_t outbuf[4096];
2743 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2745 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2746 packmsg_add_str(&inv, name);
2747 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2748 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2750 /* TODO: Add several host config files to bootstrap connections.
2751 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2752 * and are not blacklisted.
2754 config_t configs[5];
2755 memset(configs, 0, sizeof(configs));
2758 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2762 /* Append host config files to the invitation file */
2763 packmsg_add_array(&inv, count);
2765 for(int i = 0; i < count; i++) {
2766 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2767 config_free(&configs[i]);
2770 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2772 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2773 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2774 meshlink_errno = MESHLINK_ESTORAGE;
2775 pthread_mutex_unlock(&mesh->mutex);
2779 // Create an URL from the local address, key hash and cookie
2781 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2784 pthread_mutex_unlock(&mesh->mutex);
2788 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2789 return meshlink_invite_ex(mesh, submesh, name, 0);
2792 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2793 if(!mesh || !invitation) {
2794 meshlink_errno = MESHLINK_EINVAL;
2798 join_state_t state = {
2803 ecdsa_t *key = NULL;
2804 ecdsa_t *hiskey = NULL;
2806 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2807 char copy[strlen(invitation) + 1];
2809 pthread_mutex_lock(&mesh->mutex);
2811 //Before doing meshlink_join make sure we are not connected to another mesh
2812 if(mesh->threadstarted) {
2813 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2814 meshlink_errno = MESHLINK_EINVAL;
2818 // 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.
2819 if(mesh->nodes->count > 1) {
2820 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2821 meshlink_errno = MESHLINK_EINVAL;
2825 strcpy(copy, invitation);
2827 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2829 char *slash = strchr(copy, '/');
2837 if(strlen(slash) != 48) {
2841 char *address = copy;
2844 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2848 if(mesh->inviter_commits_first) {
2849 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2852 // Generate a throw-away key for the invitation.
2853 key = ecdsa_generate();
2856 meshlink_errno = MESHLINK_EINTERNAL;
2860 char *b64key = ecdsa_get_base64_public_key(key);
2863 while(address && *address) {
2864 // We allow commas in the address part to support multiple addresses in one invitation URL.
2865 comma = strchr(address, ',');
2871 // Split of the port
2872 port = strrchr(address, ':');
2880 // IPv6 address are enclosed in brackets, per RFC 3986
2881 if(*address == '[') {
2883 char *bracket = strchr(address, ']');
2896 // Connect to the meshlink daemon mentioned in the URL.
2897 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2900 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2901 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2903 if(state.sock == -1) {
2904 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2905 meshlink_errno = MESHLINK_ENETWORK;
2909 set_timeout(state.sock, 5000);
2911 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2912 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2913 meshlink_errno = MESHLINK_ENETWORK;
2914 closesocket(state.sock);
2924 meshlink_errno = MESHLINK_ERESOLV;
2927 if(state.sock != -1 || !comma) {
2934 if(state.sock == -1) {
2938 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2940 // Tell him we have an invitation, and give him our throw-away key.
2944 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2945 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2946 meshlink_errno = MESHLINK_ENETWORK;
2952 char hisname[4096] = "";
2953 int code, hismajor, hisminor = 0;
2955 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) {
2956 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2957 meshlink_errno = MESHLINK_ENETWORK;
2961 // Check if the hash of the key he gave us matches the hash in the URL.
2962 char *fingerprint = state.line + 2;
2965 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2966 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2967 meshlink_errno = MESHLINK_EINTERNAL;
2971 if(memcmp(hishash, state.hash, 18)) {
2972 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2973 meshlink_errno = MESHLINK_EPEER;
2977 hiskey = ecdsa_set_base64_public_key(fingerprint);
2980 meshlink_errno = MESHLINK_EINTERNAL;
2984 // Start an SPTPS session
2985 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2986 meshlink_errno = MESHLINK_EINTERNAL;
2990 // Feed rest of input buffer to SPTPS
2991 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2992 meshlink_errno = MESHLINK_EPEER;
2997 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2999 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3001 if(errno == EINTR) {
3005 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3006 meshlink_errno = MESHLINK_ENETWORK;
3010 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3011 meshlink_errno = MESHLINK_EPEER;
3016 if(!state.success) {
3017 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3018 meshlink_errno = MESHLINK_EPEER;
3022 sptps_stop(&state.sptps);
3025 closesocket(state.sock);
3027 pthread_mutex_unlock(&mesh->mutex);
3031 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3032 meshlink_errno = MESHLINK_EINVAL;
3034 sptps_stop(&state.sptps);
3038 if(state.sock != -1) {
3039 closesocket(state.sock);
3042 pthread_mutex_unlock(&mesh->mutex);
3046 char *meshlink_export(meshlink_handle_t *mesh) {
3048 meshlink_errno = MESHLINK_EINVAL;
3052 // Create a config file on the fly.
3055 packmsg_output_t out = {buf, sizeof(buf)};
3056 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3057 packmsg_add_str(&out, mesh->name);
3058 packmsg_add_str(&out, CORE_MESH);
3060 pthread_mutex_lock(&mesh->mutex);
3062 packmsg_add_int32(&out, mesh->self->devclass);
3063 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3064 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3065 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3069 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3070 if(mesh->self->recent[i].sa.sa_family) {
3077 packmsg_add_array(&out, count);
3079 for(uint32_t i = 0; i < count; i++) {
3080 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3083 packmsg_add_int64(&out, 0);
3084 packmsg_add_int64(&out, 0);
3086 pthread_mutex_unlock(&mesh->mutex);
3088 if(!packmsg_output_ok(&out)) {
3089 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3090 meshlink_errno = MESHLINK_EINTERNAL;
3094 // Prepare a base64-encoded packmsg array containing our config file
3096 uint32_t len = packmsg_output_size(&out, buf);
3097 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3098 uint8_t *buf2 = xmalloc(len2);
3099 packmsg_output_t out2 = {buf2, len2};
3100 packmsg_add_array(&out2, 1);
3101 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3103 if(!packmsg_output_ok(&out2)) {
3104 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3105 meshlink_errno = MESHLINK_EINTERNAL;
3110 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3112 return (char *)buf2;
3115 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3116 if(!mesh || !data) {
3117 meshlink_errno = MESHLINK_EINVAL;
3121 size_t datalen = strlen(data);
3122 uint8_t *buf = xmalloc(datalen);
3123 int buflen = b64decode(data, buf, datalen);
3126 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3127 meshlink_errno = MESHLINK_EPEER;
3131 packmsg_input_t in = {buf, buflen};
3132 uint32_t count = packmsg_get_array(&in);
3135 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3136 meshlink_errno = MESHLINK_EPEER;
3140 pthread_mutex_lock(&mesh->mutex);
3144 uint32_t len = packmsg_get_bin_raw(&in, &data);
3150 packmsg_input_t in2 = {data, len};
3151 uint32_t version = packmsg_get_uint32(&in2);
3152 char *name = packmsg_get_str_dup(&in2);
3154 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3156 packmsg_input_invalidate(&in);
3160 if(!check_id(name)) {
3165 node_t *n = lookup_node(mesh, name);
3168 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3176 config_t config = {data, len};
3178 if(!node_read_from_config(mesh, n, &config)) {
3180 packmsg_input_invalidate(&in);
3184 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3185 n->last_reachable = 0;
3186 n->last_unreachable = 0;
3188 if(!node_write_config(mesh, n)) {
3196 pthread_mutex_unlock(&mesh->mutex);
3200 if(!packmsg_done(&in)) {
3201 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3202 meshlink_errno = MESHLINK_EPEER;
3206 if(!config_sync(mesh, "current")) {
3213 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3214 if(n == mesh->self) {
3215 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3216 meshlink_errno = MESHLINK_EINVAL;
3220 if(n->status.blacklisted) {
3221 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3225 n->status.blacklisted = true;
3227 /* Immediately shut down any connections we have with the blacklisted node.
3228 * We can't call terminate_connection(), because we might be called from a callback function.
3230 for list_each(connection_t, c, mesh->connections) {
3232 shutdown(c->socket, SHUT_RDWR);
3236 utcp_abort_all_connections(n->utcp);
3242 n->status.udp_confirmed = false;
3244 if(n->status.reachable) {
3245 n->last_unreachable = time(NULL);
3248 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3249 * manually call the status callback if necessary.
3251 if(n->status.reachable && mesh->node_status_cb) {
3252 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3255 return node_write_config(mesh, n) && config_sync(mesh, "current");
3258 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3259 if(!mesh || !node) {
3260 meshlink_errno = MESHLINK_EINVAL;
3264 pthread_mutex_lock(&mesh->mutex);
3266 if(!blacklist(mesh, (node_t *)node)) {
3267 pthread_mutex_unlock(&mesh->mutex);
3271 pthread_mutex_unlock(&mesh->mutex);
3273 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3277 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3278 if(!mesh || !name) {
3279 meshlink_errno = MESHLINK_EINVAL;
3283 pthread_mutex_lock(&mesh->mutex);
3285 node_t *n = lookup_node(mesh, (char *)name);
3289 n->name = xstrdup(name);
3293 if(!blacklist(mesh, (node_t *)n)) {
3294 pthread_mutex_unlock(&mesh->mutex);
3298 pthread_mutex_unlock(&mesh->mutex);
3300 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3304 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3305 if(n == mesh->self) {
3306 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3307 meshlink_errno = MESHLINK_EINVAL;
3311 if(!n->status.blacklisted) {
3312 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3316 n->status.blacklisted = false;
3318 if(n->status.reachable) {
3319 n->last_reachable = time(NULL);
3320 update_node_status(mesh, n);
3323 return node_write_config(mesh, n) && config_sync(mesh, "current");
3326 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3327 if(!mesh || !node) {
3328 meshlink_errno = MESHLINK_EINVAL;
3332 pthread_mutex_lock(&mesh->mutex);
3334 if(!whitelist(mesh, (node_t *)node)) {
3335 pthread_mutex_unlock(&mesh->mutex);
3339 pthread_mutex_unlock(&mesh->mutex);
3341 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3345 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3346 if(!mesh || !name) {
3347 meshlink_errno = MESHLINK_EINVAL;
3351 pthread_mutex_lock(&mesh->mutex);
3353 node_t *n = lookup_node(mesh, (char *)name);
3357 n->name = xstrdup(name);
3361 if(!whitelist(mesh, (node_t *)n)) {
3362 pthread_mutex_unlock(&mesh->mutex);
3366 pthread_mutex_unlock(&mesh->mutex);
3368 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3372 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3373 mesh->default_blacklist = blacklist;
3376 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3377 if(!mesh || !node) {
3378 meshlink_errno = MESHLINK_EINVAL;
3382 node_t *n = (node_t *)node;
3384 pthread_mutex_lock(&mesh->mutex);
3386 /* Check that the node is not reachable */
3387 if(n->status.reachable || n->connection) {
3388 pthread_mutex_unlock(&mesh->mutex);
3389 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3393 /* Check that we don't have any active UTCP connections */
3394 if(n->utcp && utcp_is_active(n->utcp)) {
3395 pthread_mutex_unlock(&mesh->mutex);
3396 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3400 /* Check that we have no active connections to this node */
3401 for list_each(connection_t, c, mesh->connections) {
3403 pthread_mutex_unlock(&mesh->mutex);
3404 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3409 /* Remove any pending outgoings to this node */
3410 if(mesh->outgoings) {
3411 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3412 if(outgoing->node == n) {
3413 list_delete_node(mesh->outgoings, node);
3418 /* Delete the config file for this node */
3419 if(!config_delete(mesh, "current", n->name)) {
3420 pthread_mutex_unlock(&mesh->mutex);
3424 /* Delete the node struct and any remaining edges referencing this node */
3427 pthread_mutex_unlock(&mesh->mutex);
3429 return config_sync(mesh, "current");
3432 /* Hint that a hostname may be found at an address
3433 * See header file for detailed comment.
3435 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3436 if(!mesh || !node || !addr) {
3437 meshlink_errno = EINVAL;
3441 pthread_mutex_lock(&mesh->mutex);
3443 node_t *n = (node_t *)node;
3445 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3446 if(!node_write_config(mesh, n)) {
3447 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3451 pthread_mutex_unlock(&mesh->mutex);
3452 // @TODO do we want to fire off a connection attempt right away?
3455 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3457 node_t *n = utcp->priv;
3458 meshlink_handle_t *mesh = n->mesh;
3459 return mesh->channel_accept_cb;
3462 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3464 if(aio->cb.buffer) {
3465 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3469 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3474 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3475 meshlink_channel_t *channel = connection->priv;
3481 node_t *n = channel->node;
3482 meshlink_handle_t *mesh = n->mesh;
3484 if(n->status.destroyed) {
3485 meshlink_channel_close(mesh, channel);
3489 const char *p = data;
3492 while(channel->aio_receive) {
3493 meshlink_aio_buffer_t *aio = channel->aio_receive;
3494 size_t todo = aio->len - aio->done;
3501 memcpy((char *)aio->data + aio->done, p, todo);
3503 ssize_t result = write(aio->fd, p, todo);
3512 if(aio->done == aio->len) {
3513 channel->aio_receive = aio->next;
3514 aio_signal(mesh, channel, aio);
3526 if(channel->receive_cb) {
3527 channel->receive_cb(mesh, channel, p, left);
3533 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3534 node_t *n = utcp_connection->utcp->priv;
3540 meshlink_handle_t *mesh = n->mesh;
3542 if(!mesh->channel_accept_cb) {
3546 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3548 channel->c = utcp_connection;
3550 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3551 utcp_accept(utcp_connection, channel_recv, channel);
3557 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3558 node_t *n = utcp->priv;
3560 if(n->status.destroyed) {
3564 meshlink_handle_t *mesh = n->mesh;
3565 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3568 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3569 if(!mesh || !channel) {
3570 meshlink_errno = MESHLINK_EINVAL;
3574 channel->receive_cb = cb;
3577 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3579 node_t *n = (node_t *)source;
3585 utcp_recv(n->utcp, data, len);
3588 static void channel_poll(struct utcp_connection *connection, size_t len) {
3589 meshlink_channel_t *channel = connection->priv;
3595 node_t *n = channel->node;
3596 meshlink_handle_t *mesh = n->mesh;
3597 meshlink_aio_buffer_t *aio = channel->aio_send;
3600 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3601 size_t left = aio->len - aio->done;
3609 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3612 size_t todo = utcp_get_sndbuf_free(connection);
3618 if(todo > sizeof(buf)) {
3622 ssize_t result = read(aio->fd, buf, todo);
3625 sent = utcp_send(connection, buf, result);
3635 /* If the buffer is now completely sent, call the callback and dispose of it. */
3636 if(aio->done >= aio->len) {
3637 channel->aio_send = aio->next;
3638 aio_signal(mesh, channel, aio);
3642 if(channel->poll_cb) {
3643 channel->poll_cb(mesh, channel, len);
3645 utcp_set_poll_cb(connection, NULL);
3650 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3651 if(!mesh || !channel) {
3652 meshlink_errno = MESHLINK_EINVAL;
3656 pthread_mutex_lock(&mesh->mutex);
3657 channel->poll_cb = cb;
3658 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3659 pthread_mutex_unlock(&mesh->mutex);
3662 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3664 meshlink_errno = MESHLINK_EINVAL;
3668 pthread_mutex_lock(&mesh->mutex);
3669 mesh->channel_accept_cb = cb;
3670 mesh->receive_cb = channel_receive;
3672 for splay_each(node_t, n, mesh->nodes) {
3673 if(!n->utcp && n != mesh->self) {
3674 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3678 pthread_mutex_unlock(&mesh->mutex);
3681 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3685 meshlink_errno = MESHLINK_EINVAL;
3689 pthread_mutex_lock(&mesh->mutex);
3690 utcp_set_sndbuf(channel->c, size);
3691 pthread_mutex_unlock(&mesh->mutex);
3694 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3698 meshlink_errno = MESHLINK_EINVAL;
3702 pthread_mutex_lock(&mesh->mutex);
3703 utcp_set_rcvbuf(channel->c, size);
3704 pthread_mutex_unlock(&mesh->mutex);
3707 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) {
3709 abort(); // TODO: handle non-NULL data
3712 if(!mesh || !node) {
3713 meshlink_errno = MESHLINK_EINVAL;
3717 pthread_mutex_lock(&mesh->mutex);
3719 node_t *n = (node_t *)node;
3722 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3723 mesh->receive_cb = channel_receive;
3726 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3727 pthread_mutex_unlock(&mesh->mutex);
3732 if(n->status.blacklisted) {
3733 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3734 meshlink_errno = MESHLINK_EBLACKLISTED;
3735 pthread_mutex_unlock(&mesh->mutex);
3739 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3741 channel->receive_cb = cb;
3744 channel->priv = (void *)data;
3747 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3749 pthread_mutex_unlock(&mesh->mutex);
3752 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3760 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) {
3761 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3764 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3765 if(!mesh || !channel) {
3766 meshlink_errno = MESHLINK_EINVAL;
3770 pthread_mutex_lock(&mesh->mutex);
3771 utcp_shutdown(channel->c, direction);
3772 pthread_mutex_unlock(&mesh->mutex);
3775 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3776 if(!mesh || !channel) {
3777 meshlink_errno = MESHLINK_EINVAL;
3781 pthread_mutex_lock(&mesh->mutex);
3783 utcp_close(channel->c);
3785 /* Clean up any outstanding AIO buffers. */
3786 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3788 aio_signal(mesh, channel, aio);
3792 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3794 aio_signal(mesh, channel, aio);
3798 pthread_mutex_unlock(&mesh->mutex);
3803 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3804 if(!mesh || !channel) {
3805 meshlink_errno = MESHLINK_EINVAL;
3814 meshlink_errno = MESHLINK_EINVAL;
3818 // TODO: more finegrained locking.
3819 // Ideally we want to put the data into the UTCP connection's send buffer.
3820 // Then, preferably only if there is room in the receiver window,
3821 // kick the meshlink thread to go send packets.
3825 pthread_mutex_lock(&mesh->mutex);
3827 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3828 if(channel->aio_send) {
3831 retval = utcp_send(channel->c, data, len);
3834 pthread_mutex_unlock(&mesh->mutex);
3837 meshlink_errno = MESHLINK_ENETWORK;
3843 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) {
3844 if(!mesh || !channel) {
3845 meshlink_errno = MESHLINK_EINVAL;
3850 meshlink_errno = MESHLINK_EINVAL;
3854 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3857 aio->cb.buffer = cb;
3860 pthread_mutex_lock(&mesh->mutex);
3862 /* Append the AIO buffer descriptor to the end of the chain */
3863 meshlink_aio_buffer_t **p = &channel->aio_send;
3871 /* Ensure the poll callback is set, and call it right now to push data if possible */
3872 utcp_set_poll_cb(channel->c, channel_poll);
3873 channel_poll(channel->c, len);
3875 pthread_mutex_unlock(&mesh->mutex);
3880 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) {
3881 if(!mesh || !channel) {
3882 meshlink_errno = MESHLINK_EINVAL;
3886 if(!len || fd == -1) {
3887 meshlink_errno = MESHLINK_EINVAL;
3891 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3897 pthread_mutex_lock(&mesh->mutex);
3899 /* Append the AIO buffer descriptor to the end of the chain */
3900 meshlink_aio_buffer_t **p = &channel->aio_send;
3908 /* Ensure the poll callback is set, and call it right now to push data if possible */
3909 utcp_set_poll_cb(channel->c, channel_poll);
3910 channel_poll(channel->c, len);
3912 pthread_mutex_unlock(&mesh->mutex);
3917 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) {
3918 if(!mesh || !channel) {
3919 meshlink_errno = MESHLINK_EINVAL;
3924 meshlink_errno = MESHLINK_EINVAL;
3928 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3931 aio->cb.buffer = cb;
3934 pthread_mutex_lock(&mesh->mutex);
3936 /* Append the AIO buffer descriptor to the end of the chain */
3937 meshlink_aio_buffer_t **p = &channel->aio_receive;
3945 pthread_mutex_unlock(&mesh->mutex);
3950 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) {
3951 if(!mesh || !channel) {
3952 meshlink_errno = MESHLINK_EINVAL;
3956 if(!len || fd == -1) {
3957 meshlink_errno = MESHLINK_EINVAL;
3961 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3967 pthread_mutex_lock(&mesh->mutex);
3969 /* Append the AIO buffer descriptor to the end of the chain */
3970 meshlink_aio_buffer_t **p = &channel->aio_receive;
3978 pthread_mutex_unlock(&mesh->mutex);
3983 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3984 if(!mesh || !channel) {
3985 meshlink_errno = MESHLINK_EINVAL;
3989 return channel->c->flags;
3992 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3993 if(!mesh || !channel) {
3994 meshlink_errno = MESHLINK_EINVAL;
3998 return utcp_get_sendq(channel->c);
4001 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4002 if(!mesh || !channel) {
4003 meshlink_errno = MESHLINK_EINVAL;
4007 return utcp_get_recvq(channel->c);
4010 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4011 if(!mesh || !node) {
4012 meshlink_errno = MESHLINK_EINVAL;
4016 node_t *n = (node_t *)node;
4018 pthread_mutex_lock(&mesh->mutex);
4021 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4024 utcp_set_user_timeout(n->utcp, timeout);
4026 pthread_mutex_unlock(&mesh->mutex);
4029 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4030 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4031 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4034 if(mesh->node_status_cb) {
4035 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4038 if(mesh->node_pmtu_cb) {
4039 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4043 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4044 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4045 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4049 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4050 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4054 n->status.duplicate = true;
4055 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4058 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4062 meshlink_errno = MESHLINK_EINVAL;
4066 pthread_mutex_lock(&mesh->mutex);
4068 if(mesh->discovery == enable) {
4072 if(mesh->threadstarted) {
4074 discovery_start(mesh);
4076 discovery_stop(mesh);
4080 mesh->discovery = enable;
4083 pthread_mutex_unlock(&mesh->mutex);
4087 meshlink_errno = MESHLINK_ENOTSUP;
4091 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4092 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4093 meshlink_errno = EINVAL;
4097 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4098 meshlink_errno = EINVAL;
4102 pthread_mutex_lock(&mesh->mutex);
4103 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4104 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4105 pthread_mutex_unlock(&mesh->mutex);
4108 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4109 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4110 meshlink_errno = EINVAL;
4114 if(fast_retry_period < 0) {
4115 meshlink_errno = EINVAL;
4119 pthread_mutex_lock(&mesh->mutex);
4120 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4121 pthread_mutex_unlock(&mesh->mutex);
4124 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4126 meshlink_errno = EINVAL;
4130 pthread_mutex_lock(&mesh->mutex);
4131 mesh->inviter_commits_first = inviter_commits_first;
4132 pthread_mutex_unlock(&mesh->mutex);
4135 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4137 meshlink_errno = EINVAL;
4141 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4142 meshlink_errno = EINVAL;
4146 pthread_mutex_lock(&mesh->mutex);
4147 free(mesh->external_address_url);
4148 mesh->external_address_url = url ? xstrdup(url) : NULL;
4149 pthread_mutex_unlock(&mesh->mutex);
4152 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4155 if(!mesh->connections || !mesh->loop.running) {
4162 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
4163 // We should only call the callback function if we are in the background thread.
4164 if(!mesh->error_cb) {
4168 if(!mesh->threadstarted) {
4172 if(mesh->thread == pthread_self()) {
4173 mesh->error_cb(mesh, meshlink_errno);
4177 static void __attribute__((constructor)) meshlink_init(void) {
4181 static void __attribute__((destructor)) meshlink_exit(void) {