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 *colon = strchr(hostname[n], ':');
449 port[n] = xstrdup(colon + 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, 4);
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
514 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)ai_in->ai_addr);
516 if(flags & MESHLINK_INVITE_NUMERIC) {
517 // We don't need to do any further conversion
522 // Convert it to a hostname
523 char resolved_host[NI_MAXHOST];
524 char resolved_port[NI_MAXSERV];
525 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
527 if(err || !is_valid_hostname(resolved_host)) {
532 // Convert the hostname back to a sockaddr
533 hint.ai_family = ai_in->ai_family;
534 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
541 // Check if it's still the same sockaddr
542 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
544 freeaddrinfo(ai_out);
548 // Yes: replace the hostname with the resolved one
550 hostname[i] = xstrdup(resolved_host);
553 freeaddrinfo(ai_out);
556 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
557 remove_duplicate_hostnames(hostname, port, n);
559 // Concatenate all unique address to the hostport string
560 for(int i = 0; i < n; i++) {
565 // Append the address to the hostport string
567 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
569 hostport = newhostport;
578 static bool try_bind(int port) {
579 struct addrinfo *ai = NULL;
580 struct addrinfo hint = {
581 .ai_flags = AI_PASSIVE,
582 .ai_family = AF_UNSPEC,
583 .ai_socktype = SOCK_STREAM,
584 .ai_protocol = IPPROTO_TCP,
588 snprintf(portstr, sizeof(portstr), "%d", port);
590 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
594 bool success = false;
596 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
597 /* Try to bind to TCP. */
599 int tcp_fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
605 int result = bind(tcp_fd, aip->ai_addr, aip->ai_addrlen);
609 if(errno == EADDRINUSE) {
610 /* If this port is in use for any address family, avoid it. */
618 /* If TCP worked, then we require that UDP works as well. */
620 int udp_fd = socket(aip->ai_family, SOCK_DGRAM, IPPROTO_UDP);
627 result = bind(udp_fd, aip->ai_addr, aip->ai_addrlen);
642 int check_port(meshlink_handle_t *mesh) {
643 for(int i = 0; i < 1000; i++) {
644 int port = 0x1000 + prng(mesh, 0x8000);
648 xasprintf(&mesh->myport, "%d", port);
653 meshlink_errno = MESHLINK_ENETWORK;
654 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
658 static bool write_main_config_files(meshlink_handle_t *mesh) {
659 if(!mesh->confbase) {
665 /* Write the main config file */
666 packmsg_output_t out = {buf, sizeof buf};
668 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
669 packmsg_add_str(&out, mesh->name);
670 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
671 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
672 packmsg_add_uint16(&out, atoi(mesh->myport));
674 if(!packmsg_output_ok(&out)) {
678 config_t config = {buf, packmsg_output_size(&out, buf)};
680 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
684 /* Write our own host config file */
685 if(!node_write_config(mesh, mesh->self)) {
693 meshlink_handle_t *mesh;
695 char cookie[18 + 32];
706 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
707 meshlink_handle_t *mesh = state->mesh;
708 packmsg_input_t in = {buf, len};
709 uint32_t version = packmsg_get_uint32(&in);
711 if(version != MESHLINK_INVITATION_VERSION) {
712 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
716 char *name = packmsg_get_str_dup(&in);
717 packmsg_skip_element(&in); /* submesh */
718 dev_class_t devclass = packmsg_get_int32(&in);
719 uint32_t count = packmsg_get_array(&in);
722 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
726 if(!check_id(name)) {
727 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
733 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
739 free(mesh->self->name);
741 mesh->self->name = xstrdup(name);
742 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
744 // Initialize configuration directory
745 if(!config_init(mesh, "current")) {
749 if(!write_main_config_files(mesh)) {
753 // Write host config files
754 for(uint32_t i = 0; i < count; i++) {
756 uint32_t len = packmsg_get_bin_raw(&in, &data);
759 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
763 packmsg_input_t in2 = {data, len};
764 uint32_t version = packmsg_get_uint32(&in2);
765 char *name = packmsg_get_str_dup(&in2);
767 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
769 packmsg_input_invalidate(&in);
773 if(!check_id(name)) {
778 if(!strcmp(name, mesh->name)) {
779 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
781 meshlink_errno = MESHLINK_EPEER;
785 node_t *n = new_node();
788 config_t config = {data, len};
790 if(!node_read_from_config(mesh, n, &config)) {
792 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
793 meshlink_errno = MESHLINK_EPEER;
798 /* The first host config file is of the inviter itself;
799 * remember the address we are currently using for the invitation connection.
802 socklen_t salen = sizeof(sa);
804 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
805 node_add_recent_address(mesh, n, &sa);
809 /* Clear the reachability times, since we ourself have never seen these nodes yet */
810 n->last_reachable = 0;
811 n->last_unreachable = 0;
813 if(!node_write_config(mesh, n)) {
821 /* Ensure the configuration directory metadata is on disk */
822 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
826 if(!mesh->inviter_commits_first) {
827 devtool_set_inviter_commits_first(false);
830 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
832 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
837 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
839 join_state_t *state = handle;
840 const char *ptr = data;
843 int result = send(state->sock, ptr, len, 0);
845 if(result == -1 && errno == EINTR) {
847 } else if(result <= 0) {
858 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
859 join_state_t *state = handle;
860 meshlink_handle_t *mesh = state->mesh;
862 if(mesh->inviter_commits_first) {
864 case SPTPS_HANDSHAKE:
865 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
871 if(!finalize_join(state, msg, len)) {
875 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
876 shutdown(state->sock, SHUT_RDWR);
877 state->success = true;
885 case SPTPS_HANDSHAKE:
886 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
889 return finalize_join(state, msg, len);
892 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
893 shutdown(state->sock, SHUT_RDWR);
894 state->success = true;
905 static bool recvline(join_state_t *state) {
906 char *newline = NULL;
908 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
909 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
911 if(result == -1 && errno == EINTR) {
913 } else if(result <= 0) {
917 state->blen += result;
920 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
924 size_t len = newline - state->buffer;
926 memcpy(state->line, state->buffer, len);
927 state->line[len] = 0;
928 memmove(state->buffer, newline + 1, state->blen - len - 1);
929 state->blen -= len + 1;
934 static bool sendline(int fd, char *format, ...) {
940 va_start(ap, format);
941 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
944 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
952 int result = send(fd, p, blen, MSG_NOSIGNAL);
954 if(result == -1 && errno == EINTR) {
956 } else if(result <= 0) {
967 static const char *errstr[] = {
968 [MESHLINK_OK] = "No error",
969 [MESHLINK_EINVAL] = "Invalid argument",
970 [MESHLINK_ENOMEM] = "Out of memory",
971 [MESHLINK_ENOENT] = "No such node",
972 [MESHLINK_EEXIST] = "Node already exists",
973 [MESHLINK_EINTERNAL] = "Internal error",
974 [MESHLINK_ERESOLV] = "Could not resolve hostname",
975 [MESHLINK_ESTORAGE] = "Storage error",
976 [MESHLINK_ENETWORK] = "Network error",
977 [MESHLINK_EPEER] = "Error communicating with peer",
978 [MESHLINK_ENOTSUP] = "Operation not supported",
979 [MESHLINK_EBUSY] = "MeshLink instance already in use",
980 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
983 const char *meshlink_strerror(meshlink_errno_t err) {
984 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
985 return "Invalid error code";
991 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
992 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
994 mesh->private_key = ecdsa_generate();
995 mesh->invitation_key = ecdsa_generate();
997 if(!mesh->private_key || !mesh->invitation_key) {
998 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
999 meshlink_errno = MESHLINK_EINTERNAL;
1003 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1008 static struct timeval idle(event_loop_t *loop, void *data) {
1010 meshlink_handle_t *mesh = data;
1011 struct timeval t, tmin = {3600, 0};
1013 for splay_each(node_t, n, mesh->nodes) {
1018 t = utcp_timeout(n->utcp);
1020 if(timercmp(&t, &tmin, <)) {
1028 // Get our local address(es) by simulating connecting to an Internet host.
1029 static void add_local_addresses(meshlink_handle_t *mesh) {
1031 sa.storage.ss_family = AF_UNKNOWN;
1032 socklen_t salen = sizeof(sa);
1036 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1037 sa.in.sin_port = ntohs(atoi(mesh->myport));
1038 node_add_recent_address(mesh, mesh->self, &sa);
1045 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1046 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1047 node_add_recent_address(mesh, mesh->self, &sa);
1051 static bool meshlink_setup(meshlink_handle_t *mesh) {
1052 if(!config_destroy(mesh->confbase, "new")) {
1053 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1054 meshlink_errno = MESHLINK_ESTORAGE;
1058 if(!config_destroy(mesh->confbase, "old")) {
1059 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1060 meshlink_errno = MESHLINK_ESTORAGE;
1064 if(!config_init(mesh, "current")) {
1065 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1066 meshlink_errno = MESHLINK_ESTORAGE;
1070 if(!ecdsa_keygen(mesh)) {
1071 meshlink_errno = MESHLINK_EINTERNAL;
1075 if(check_port(mesh) == 0) {
1076 meshlink_errno = MESHLINK_ENETWORK;
1080 /* Create a node for ourself */
1082 mesh->self = new_node();
1083 mesh->self->name = xstrdup(mesh->name);
1084 mesh->self->devclass = mesh->devclass;
1085 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1086 mesh->self->session_id = mesh->session_id;
1088 if(!write_main_config_files(mesh)) {
1089 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1090 meshlink_errno = MESHLINK_ESTORAGE;
1094 /* Ensure the configuration directory metadata is on disk */
1095 if(!config_sync(mesh, "current")) {
1102 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1105 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1106 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1110 packmsg_input_t in = {config.buf, config.len};
1111 const void *private_key;
1112 const void *invitation_key;
1114 uint32_t version = packmsg_get_uint32(&in);
1115 char *name = packmsg_get_str_dup(&in);
1116 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1117 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1118 uint16_t myport = packmsg_get_uint16(&in);
1120 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1121 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1123 config_free(&config);
1129 // TODO: check this?
1130 if(mesh->name && strcmp(mesh->name, name)) {
1131 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1132 meshlink_errno = MESHLINK_ESTORAGE;
1134 config_free(&config);
1142 xasprintf(&mesh->myport, "%u", myport);
1143 mesh->private_key = ecdsa_set_private_key(private_key);
1144 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1145 config_free(&config);
1147 /* Create a node for ourself and read our host configuration file */
1149 mesh->self = new_node();
1150 mesh->self->name = xstrdup(name);
1151 mesh->self->devclass = mesh->devclass;
1152 mesh->self->session_id = mesh->session_id;
1154 if(!node_read_public_key(mesh, mesh->self)) {
1155 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1156 meshlink_errno = MESHLINK_ESTORAGE;
1157 free_node(mesh->self);
1166 static void *setup_network_in_netns_thread(void *arg) {
1167 meshlink_handle_t *mesh = arg;
1169 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1173 bool success = setup_network(mesh);
1174 add_local_addresses(mesh);
1175 return success ? arg : NULL;
1177 #endif // HAVE_SETNS
1179 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1180 if(!confbase || !*confbase) {
1181 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1182 meshlink_errno = MESHLINK_EINVAL;
1186 if(!appname || !*appname) {
1187 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1188 meshlink_errno = MESHLINK_EINVAL;
1192 if(strchr(appname, ' ')) {
1193 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 if(!name || !*name) {
1199 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1200 meshlink_errno = MESHLINK_EINVAL;
1204 if(!check_id(name)) {
1205 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1206 meshlink_errno = MESHLINK_EINVAL;
1210 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1211 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1212 meshlink_errno = MESHLINK_EINVAL;
1216 meshlink_open_params_t *params = xzalloc(sizeof * params);
1218 params->confbase = xstrdup(confbase);
1219 params->name = xstrdup(name);
1220 params->appname = xstrdup(appname);
1221 params->devclass = devclass;
1227 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1229 meshlink_errno = MESHLINK_EINVAL;
1233 params->netns = netns;
1238 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1240 meshlink_errno = MESHLINK_EINVAL;
1244 if((!key && keylen) || (key && !keylen)) {
1245 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1246 meshlink_errno = MESHLINK_EINVAL;
1251 params->keylen = keylen;
1256 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1257 if(!mesh || !new_key || !new_keylen) {
1258 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1259 meshlink_errno = MESHLINK_EINVAL;
1263 pthread_mutex_lock(&mesh->mutex);
1265 // Create hash for the new key
1266 void *new_config_key;
1267 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1269 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1270 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1271 meshlink_errno = MESHLINK_EINTERNAL;
1272 pthread_mutex_unlock(&mesh->mutex);
1276 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1278 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1279 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1280 meshlink_errno = MESHLINK_ESTORAGE;
1281 pthread_mutex_unlock(&mesh->mutex);
1285 devtool_keyrotate_probe(1);
1287 // Rename confbase/current/ to confbase/old
1289 if(!config_rename(mesh, "current", "old")) {
1290 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1291 meshlink_errno = MESHLINK_ESTORAGE;
1292 pthread_mutex_unlock(&mesh->mutex);
1296 devtool_keyrotate_probe(2);
1298 // Rename confbase/new/ to confbase/current
1300 if(!config_rename(mesh, "new", "current")) {
1301 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1302 meshlink_errno = MESHLINK_ESTORAGE;
1303 pthread_mutex_unlock(&mesh->mutex);
1307 devtool_keyrotate_probe(3);
1309 // Cleanup the "old" confbase sub-directory
1311 if(!config_destroy(mesh->confbase, "old")) {
1312 pthread_mutex_unlock(&mesh->mutex);
1316 // Change the mesh handle key with new key
1318 free(mesh->config_key);
1319 mesh->config_key = new_config_key;
1321 pthread_mutex_unlock(&mesh->mutex);
1326 void meshlink_open_params_free(meshlink_open_params_t *params) {
1328 meshlink_errno = MESHLINK_EINVAL;
1332 free(params->confbase);
1334 free(params->appname);
1339 /// Device class traits
1340 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1341 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1342 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1343 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1344 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1347 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1348 if(!confbase || !*confbase) {
1349 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1350 meshlink_errno = MESHLINK_EINVAL;
1354 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1355 meshlink_open_params_t params;
1356 memset(¶ms, 0, sizeof(params));
1358 params.confbase = (char *)confbase;
1359 params.name = (char *)name;
1360 params.appname = (char *)appname;
1361 params.devclass = devclass;
1364 return meshlink_open_ex(¶ms);
1367 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) {
1368 if(!confbase || !*confbase) {
1369 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1370 meshlink_errno = MESHLINK_EINVAL;
1374 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1375 meshlink_open_params_t params;
1376 memset(¶ms, 0, sizeof(params));
1378 params.confbase = (char *)confbase;
1379 params.name = (char *)name;
1380 params.appname = (char *)appname;
1381 params.devclass = devclass;
1384 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1388 return meshlink_open_ex(¶ms);
1391 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1392 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1393 meshlink_open_params_t params;
1394 memset(¶ms, 0, sizeof(params));
1396 params.name = (char *)name;
1397 params.appname = (char *)appname;
1398 params.devclass = devclass;
1401 return meshlink_open_ex(¶ms);
1404 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1405 // Validate arguments provided by the application
1406 bool usingname = false;
1408 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1410 if(!params->appname || !*params->appname) {
1411 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1412 meshlink_errno = MESHLINK_EINVAL;
1416 if(strchr(params->appname, ' ')) {
1417 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1418 meshlink_errno = MESHLINK_EINVAL;
1422 if(!params->name || !*params->name) {
1423 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1425 } else { //check name only if there is a name != NULL
1427 if(!check_id(params->name)) {
1428 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1429 meshlink_errno = MESHLINK_EINVAL;
1436 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1437 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1438 meshlink_errno = MESHLINK_EINVAL;
1442 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1443 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1444 meshlink_errno = MESHLINK_EINVAL;
1448 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1450 if(params->confbase) {
1451 mesh->confbase = xstrdup(params->confbase);
1454 mesh->appname = xstrdup(params->appname);
1455 mesh->devclass = params->devclass;
1456 mesh->discovery = true;
1457 mesh->invitation_timeout = 604800; // 1 week
1458 mesh->netns = params->netns;
1459 mesh->submeshes = NULL;
1460 mesh->log_cb = global_log_cb;
1461 mesh->log_level = global_log_level;
1463 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1466 randomize(&mesh->session_id, sizeof(mesh->session_id));
1467 } while(mesh->session_id == 0);
1469 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1472 mesh->name = xstrdup(params->name);
1477 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1479 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1480 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1481 meshlink_close(mesh);
1482 meshlink_errno = MESHLINK_EINTERNAL;
1488 pthread_mutexattr_t attr;
1489 pthread_mutexattr_init(&attr);
1490 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1491 pthread_mutex_init(&mesh->mutex, &attr);
1493 mesh->threadstarted = false;
1494 event_loop_init(&mesh->loop);
1495 mesh->loop.data = mesh;
1497 meshlink_queue_init(&mesh->outpacketqueue);
1499 // Atomically lock the configuration directory.
1500 if(!main_config_lock(mesh)) {
1501 meshlink_close(mesh);
1505 // If no configuration exists yet, create it.
1507 if(!meshlink_confbase_exists(mesh)) {
1508 if(!meshlink_setup(mesh)) {
1509 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1510 meshlink_close(mesh);
1514 if(!meshlink_read_config(mesh)) {
1515 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1516 meshlink_close(mesh);
1522 struct WSAData wsa_state;
1523 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1526 // Setup up everything
1527 // TODO: we should not open listening sockets yet
1529 bool success = false;
1531 if(mesh->netns != -1) {
1535 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1536 void *retval = NULL;
1537 success = pthread_join(thr, &retval) == 0 && retval;
1541 meshlink_errno = MESHLINK_EINTERNAL;
1544 #endif // HAVE_SETNS
1546 success = setup_network(mesh);
1547 add_local_addresses(mesh);
1551 meshlink_close(mesh);
1552 meshlink_errno = MESHLINK_ENETWORK;
1556 add_local_addresses(mesh);
1558 if(!node_write_config(mesh, mesh->self)) {
1559 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1563 idle_set(&mesh->loop, idle, mesh);
1565 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1569 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1570 meshlink_submesh_t *s = NULL;
1573 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1574 meshlink_errno = MESHLINK_EINVAL;
1578 if(!submesh || !*submesh) {
1579 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1580 meshlink_errno = MESHLINK_EINVAL;
1585 pthread_mutex_lock(&mesh->mutex);
1587 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1589 pthread_mutex_unlock(&mesh->mutex);
1594 static void *meshlink_main_loop(void *arg) {
1595 meshlink_handle_t *mesh = arg;
1597 if(mesh->netns != -1) {
1600 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1601 pthread_cond_signal(&mesh->cond);
1606 pthread_cond_signal(&mesh->cond);
1608 #endif // HAVE_SETNS
1613 if(mesh->discovery) {
1614 discovery_start(mesh);
1619 pthread_mutex_lock(&mesh->mutex);
1621 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1622 pthread_cond_broadcast(&mesh->cond);
1624 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1626 pthread_mutex_unlock(&mesh->mutex);
1631 if(mesh->discovery) {
1632 discovery_stop(mesh);
1640 bool meshlink_start(meshlink_handle_t *mesh) {
1642 meshlink_errno = MESHLINK_EINVAL;
1646 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1648 pthread_mutex_lock(&mesh->mutex);
1651 assert(mesh->private_key);
1652 assert(mesh->self->ecdsa);
1653 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1655 if(mesh->threadstarted) {
1656 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1657 pthread_mutex_unlock(&mesh->mutex);
1661 if(mesh->listen_socket[0].tcp.fd < 0) {
1662 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1663 meshlink_errno = MESHLINK_ENETWORK;
1667 // TODO: open listening sockets first
1669 //Check that a valid name is set
1671 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1672 meshlink_errno = MESHLINK_EINVAL;
1673 pthread_mutex_unlock(&mesh->mutex);
1677 init_outgoings(mesh);
1679 // Start the main thread
1681 event_loop_start(&mesh->loop);
1683 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1684 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1685 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1686 meshlink_errno = MESHLINK_EINTERNAL;
1687 event_loop_stop(&mesh->loop);
1688 pthread_mutex_unlock(&mesh->mutex);
1692 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1693 mesh->threadstarted = true;
1695 // Ensure we are considered reachable
1698 pthread_mutex_unlock(&mesh->mutex);
1702 void meshlink_stop(meshlink_handle_t *mesh) {
1704 meshlink_errno = MESHLINK_EINVAL;
1708 pthread_mutex_lock(&mesh->mutex);
1709 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1711 // Shut down the main thread
1712 event_loop_stop(&mesh->loop);
1714 // Send ourselves a UDP packet to kick the event loop
1715 for(int i = 0; i < mesh->listen_sockets; i++) {
1717 socklen_t salen = sizeof(sa);
1719 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1720 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1724 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1725 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1729 if(mesh->threadstarted) {
1730 // Wait for the main thread to finish
1731 pthread_mutex_unlock(&mesh->mutex);
1732 pthread_join(mesh->thread, NULL);
1733 pthread_mutex_lock(&mesh->mutex);
1735 mesh->threadstarted = false;
1738 // Close all metaconnections
1739 if(mesh->connections) {
1740 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1742 connection_t *c = node->data;
1744 terminate_connection(mesh, c, false);
1748 exit_outgoings(mesh);
1750 // Ensure we are considered unreachable
1755 // Try to write out any changed node config files, ignore errors at this point.
1757 for splay_each(node_t, n, mesh->nodes) {
1758 if(n->status.dirty) {
1759 n->status.dirty = !node_write_config(mesh, n);
1764 pthread_mutex_unlock(&mesh->mutex);
1767 void meshlink_close(meshlink_handle_t *mesh) {
1769 meshlink_errno = MESHLINK_EINVAL;
1773 // stop can be called even if mesh has not been started
1774 meshlink_stop(mesh);
1776 // lock is not released after this
1777 pthread_mutex_lock(&mesh->mutex);
1779 // Close and free all resources used.
1781 close_network_connections(mesh);
1783 logger(mesh, MESHLINK_INFO, "Terminating");
1785 event_loop_exit(&mesh->loop);
1789 if(mesh->confbase) {
1795 ecdsa_free(mesh->invitation_key);
1797 if(mesh->netns != -1) {
1801 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1805 meshlink_queue_exit(&mesh->outpacketqueue);
1808 free(mesh->appname);
1809 free(mesh->confbase);
1810 free(mesh->config_key);
1811 free(mesh->external_address_url);
1812 ecdsa_free(mesh->private_key);
1814 if(mesh->invitation_addresses) {
1815 list_delete_list(mesh->invitation_addresses);
1818 main_config_unlock(mesh);
1820 pthread_mutex_unlock(&mesh->mutex);
1821 pthread_mutex_destroy(&mesh->mutex);
1823 memset(mesh, 0, sizeof(*mesh));
1828 bool meshlink_destroy(const char *confbase) {
1830 meshlink_errno = MESHLINK_EINVAL;
1834 /* Exit early if the confbase directory itself doesn't exist */
1835 if(access(confbase, F_OK) && errno == ENOENT) {
1839 /* Take the lock the same way meshlink_open() would. */
1840 char lockfilename[PATH_MAX];
1841 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1843 FILE *lockfile = fopen(lockfilename, "w+");
1846 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1847 meshlink_errno = MESHLINK_ESTORAGE;
1852 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1856 // TODO: use _locking()?
1859 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1860 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1862 meshlink_errno = MESHLINK_EBUSY;
1868 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1869 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1873 if(unlink(lockfilename)) {
1874 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1876 meshlink_errno = MESHLINK_ESTORAGE;
1882 if(!sync_path(confbase)) {
1883 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1884 meshlink_errno = MESHLINK_ESTORAGE;
1891 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1893 meshlink_errno = MESHLINK_EINVAL;
1897 pthread_mutex_lock(&mesh->mutex);
1898 mesh->receive_cb = cb;
1899 pthread_mutex_unlock(&mesh->mutex);
1902 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1904 meshlink_errno = MESHLINK_EINVAL;
1908 pthread_mutex_lock(&mesh->mutex);
1909 mesh->connection_try_cb = cb;
1910 pthread_mutex_unlock(&mesh->mutex);
1913 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1915 meshlink_errno = MESHLINK_EINVAL;
1919 pthread_mutex_lock(&mesh->mutex);
1920 mesh->node_status_cb = cb;
1921 pthread_mutex_unlock(&mesh->mutex);
1924 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1926 meshlink_errno = MESHLINK_EINVAL;
1930 pthread_mutex_lock(&mesh->mutex);
1931 mesh->node_pmtu_cb = cb;
1932 pthread_mutex_unlock(&mesh->mutex);
1935 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1937 meshlink_errno = MESHLINK_EINVAL;
1941 pthread_mutex_lock(&mesh->mutex);
1942 mesh->node_duplicate_cb = cb;
1943 pthread_mutex_unlock(&mesh->mutex);
1946 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1948 pthread_mutex_lock(&mesh->mutex);
1950 mesh->log_level = cb ? level : 0;
1951 pthread_mutex_unlock(&mesh->mutex);
1954 global_log_level = cb ? level : 0;
1958 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1960 meshlink_errno = MESHLINK_EINVAL;
1964 pthread_mutex_lock(&mesh->mutex);
1965 mesh->error_cb = cb;
1966 pthread_mutex_unlock(&mesh->mutex);
1969 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1970 meshlink_packethdr_t *hdr;
1972 // Validate arguments
1973 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1974 meshlink_errno = MESHLINK_EINVAL;
1983 meshlink_errno = MESHLINK_EINVAL;
1987 node_t *n = (node_t *)destination;
1989 if(n->status.blacklisted) {
1990 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1991 meshlink_errno = MESHLINK_EBLACKLISTED;
1995 // Prepare the packet
1996 vpn_packet_t *packet = malloc(sizeof(*packet));
1999 meshlink_errno = MESHLINK_ENOMEM;
2003 packet->probe = false;
2004 packet->tcp = false;
2005 packet->len = len + sizeof(*hdr);
2007 hdr = (meshlink_packethdr_t *)packet->data;
2008 memset(hdr, 0, sizeof(*hdr));
2009 // leave the last byte as 0 to make sure strings are always
2010 // null-terminated if they are longer than the buffer
2011 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
2012 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
2014 memcpy(packet->data + sizeof(*hdr), data, len);
2017 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2019 meshlink_errno = MESHLINK_ENOMEM;
2023 // Notify event loop
2024 signal_trigger(&mesh->loop, &mesh->datafromapp);
2029 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2031 meshlink_handle_t *mesh = data;
2032 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
2038 mesh->self->in_packets++;
2039 mesh->self->in_bytes += packet->len;
2040 route(mesh, mesh->self, packet);
2045 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2046 if(!mesh || !destination) {
2047 meshlink_errno = MESHLINK_EINVAL;
2051 pthread_mutex_lock(&mesh->mutex);
2053 node_t *n = (node_t *)destination;
2055 if(!n->status.reachable) {
2056 pthread_mutex_unlock(&mesh->mutex);
2059 } else if(n->mtuprobes > 30 && n->minmtu) {
2060 pthread_mutex_unlock(&mesh->mutex);
2063 pthread_mutex_unlock(&mesh->mutex);
2068 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2069 if(!mesh || !node) {
2070 meshlink_errno = MESHLINK_EINVAL;
2074 pthread_mutex_lock(&mesh->mutex);
2076 node_t *n = (node_t *)node;
2078 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2079 meshlink_errno = MESHLINK_EINTERNAL;
2080 pthread_mutex_unlock(&mesh->mutex);
2084 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2087 meshlink_errno = MESHLINK_EINTERNAL;
2090 pthread_mutex_unlock(&mesh->mutex);
2094 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2096 meshlink_errno = MESHLINK_EINVAL;
2100 return (meshlink_node_t *)mesh->self;
2103 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2104 if(!mesh || !name) {
2105 meshlink_errno = MESHLINK_EINVAL;
2111 pthread_mutex_lock(&mesh->mutex);
2112 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2113 pthread_mutex_unlock(&mesh->mutex);
2116 meshlink_errno = MESHLINK_ENOENT;
2119 return (meshlink_node_t *)n;
2122 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2123 if(!mesh || !name) {
2124 meshlink_errno = MESHLINK_EINVAL;
2128 meshlink_submesh_t *submesh = NULL;
2130 pthread_mutex_lock(&mesh->mutex);
2131 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2132 pthread_mutex_unlock(&mesh->mutex);
2135 meshlink_errno = MESHLINK_ENOENT;
2141 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2142 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2143 meshlink_errno = MESHLINK_EINVAL;
2147 meshlink_node_t **result;
2150 pthread_mutex_lock(&mesh->mutex);
2152 *nmemb = mesh->nodes->count;
2153 result = realloc(nodes, *nmemb * sizeof(*nodes));
2156 meshlink_node_t **p = result;
2158 for splay_each(node_t, n, mesh->nodes) {
2159 *p++ = (meshlink_node_t *)n;
2164 meshlink_errno = MESHLINK_ENOMEM;
2167 pthread_mutex_unlock(&mesh->mutex);
2172 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) {
2173 meshlink_node_t **result;
2175 pthread_mutex_lock(&mesh->mutex);
2179 for splay_each(node_t, n, mesh->nodes) {
2180 if(search_node(n, condition)) {
2187 pthread_mutex_unlock(&mesh->mutex);
2191 result = realloc(nodes, *nmemb * sizeof(*nodes));
2194 meshlink_node_t **p = result;
2196 for splay_each(node_t, n, mesh->nodes) {
2197 if(search_node(n, condition)) {
2198 *p++ = (meshlink_node_t *)n;
2204 meshlink_errno = MESHLINK_ENOMEM;
2207 pthread_mutex_unlock(&mesh->mutex);
2212 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2213 dev_class_t *devclass = (dev_class_t *)condition;
2215 if(*devclass == (dev_class_t)node->devclass) {
2222 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2223 if(condition == node->submesh) {
2235 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2236 const struct time_range *range = condition;
2237 time_t start = node->last_reachable;
2238 time_t end = node->last_unreachable;
2248 if(range->end >= range->start) {
2249 return start <= range->end && end >= range->start;
2251 return start > range->start || end < range->end;
2255 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) {
2256 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2257 meshlink_errno = MESHLINK_EINVAL;
2261 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2264 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2265 if(!mesh || !submesh || !nmemb) {
2266 meshlink_errno = MESHLINK_EINVAL;
2270 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2273 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) {
2274 if(!mesh || !nmemb) {
2275 meshlink_errno = MESHLINK_EINVAL;
2279 struct time_range range = {start, end};
2281 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2284 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2285 if(!mesh || !node) {
2286 meshlink_errno = MESHLINK_EINVAL;
2290 dev_class_t devclass;
2292 pthread_mutex_lock(&mesh->mutex);
2294 devclass = ((node_t *)node)->devclass;
2296 pthread_mutex_unlock(&mesh->mutex);
2301 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2302 if(!mesh || !node) {
2303 meshlink_errno = MESHLINK_EINVAL;
2307 node_t *n = (node_t *)node;
2309 meshlink_submesh_t *s;
2311 s = (meshlink_submesh_t *)n->submesh;
2316 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2317 if(!mesh || !node) {
2318 meshlink_errno = MESHLINK_EINVAL;
2322 node_t *n = (node_t *)node;
2325 pthread_mutex_lock(&mesh->mutex);
2326 reachable = n->status.reachable && !n->status.blacklisted;
2328 if(last_reachable) {
2329 *last_reachable = n->last_reachable;
2332 if(last_unreachable) {
2333 *last_unreachable = n->last_unreachable;
2336 pthread_mutex_unlock(&mesh->mutex);
2341 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2342 if(!mesh || !data || !len || !signature || !siglen) {
2343 meshlink_errno = MESHLINK_EINVAL;
2347 if(*siglen < MESHLINK_SIGLEN) {
2348 meshlink_errno = MESHLINK_EINVAL;
2352 pthread_mutex_lock(&mesh->mutex);
2354 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2355 meshlink_errno = MESHLINK_EINTERNAL;
2356 pthread_mutex_unlock(&mesh->mutex);
2360 *siglen = MESHLINK_SIGLEN;
2361 pthread_mutex_unlock(&mesh->mutex);
2365 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2366 if(!mesh || !source || !data || !len || !signature) {
2367 meshlink_errno = MESHLINK_EINVAL;
2371 if(siglen != MESHLINK_SIGLEN) {
2372 meshlink_errno = MESHLINK_EINVAL;
2376 pthread_mutex_lock(&mesh->mutex);
2380 struct node_t *n = (struct node_t *)source;
2382 if(!node_read_public_key(mesh, n)) {
2383 meshlink_errno = MESHLINK_EINTERNAL;
2386 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2389 pthread_mutex_unlock(&mesh->mutex);
2393 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2394 pthread_mutex_lock(&mesh->mutex);
2396 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2399 // TODO: Update invitation key if necessary?
2402 pthread_mutex_unlock(&mesh->mutex);
2404 return mesh->invitation_key;
2407 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2408 if(!mesh || !node || !address) {
2409 meshlink_errno = MESHLINK_EINVAL;
2413 if(!is_valid_hostname(address)) {
2414 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2415 meshlink_errno = MESHLINK_EINVAL;
2419 if(port && !is_valid_port(port)) {
2420 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2421 meshlink_errno = MESHLINK_EINVAL;
2425 char *canonical_address;
2428 xasprintf(&canonical_address, "%s %s", address, port);
2430 canonical_address = xstrdup(address);
2433 pthread_mutex_lock(&mesh->mutex);
2435 node_t *n = (node_t *)node;
2436 free(n->canonical_address);
2437 n->canonical_address = canonical_address;
2439 if(!node_write_config(mesh, n)) {
2440 pthread_mutex_unlock(&mesh->mutex);
2444 pthread_mutex_unlock(&mesh->mutex);
2446 return config_sync(mesh, "current");
2449 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2450 if(!mesh || !address) {
2451 meshlink_errno = MESHLINK_EINVAL;
2455 if(!is_valid_hostname(address)) {
2456 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2457 meshlink_errno = MESHLINK_EINVAL;
2461 if(port && !is_valid_port(port)) {
2462 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2463 meshlink_errno = MESHLINK_EINVAL;
2470 if(strchr(address, ':')) {
2471 xasprintf(&combo, "[%s]:%s", address, port);
2473 xasprintf(&combo, "%s:%s", address, port);
2476 combo = xstrdup(address);
2479 pthread_mutex_lock(&mesh->mutex);
2481 if(!mesh->invitation_addresses) {
2482 mesh->invitation_addresses = list_alloc((list_action_t)free);
2485 list_insert_tail(mesh->invitation_addresses, combo);
2486 pthread_mutex_unlock(&mesh->mutex);
2491 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2493 meshlink_errno = MESHLINK_EINVAL;
2497 pthread_mutex_lock(&mesh->mutex);
2499 if(mesh->invitation_addresses) {
2500 list_delete_list(mesh->invitation_addresses);
2501 mesh->invitation_addresses = NULL;
2504 pthread_mutex_unlock(&mesh->mutex);
2507 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2508 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2511 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2513 meshlink_errno = MESHLINK_EINVAL;
2517 char *address = meshlink_get_external_address(mesh);
2523 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2529 int meshlink_get_port(meshlink_handle_t *mesh) {
2531 meshlink_errno = MESHLINK_EINVAL;
2536 meshlink_errno = MESHLINK_EINTERNAL;
2542 pthread_mutex_lock(&mesh->mutex);
2543 port = atoi(mesh->myport);
2544 pthread_mutex_unlock(&mesh->mutex);
2549 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2550 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2551 meshlink_errno = MESHLINK_EINVAL;
2555 if(mesh->myport && port == atoi(mesh->myport)) {
2559 if(!try_bind(port)) {
2560 meshlink_errno = MESHLINK_ENETWORK;
2564 devtool_trybind_probe();
2568 pthread_mutex_lock(&mesh->mutex);
2570 if(mesh->threadstarted) {
2571 meshlink_errno = MESHLINK_EINVAL;
2576 xasprintf(&mesh->myport, "%d", port);
2578 /* Close down the network. This also deletes mesh->self. */
2579 close_network_connections(mesh);
2581 /* Recreate mesh->self. */
2582 mesh->self = new_node();
2583 mesh->self->name = xstrdup(mesh->name);
2584 mesh->self->devclass = mesh->devclass;
2585 mesh->self->session_id = mesh->session_id;
2586 xasprintf(&mesh->myport, "%d", port);
2588 if(!node_read_public_key(mesh, mesh->self)) {
2589 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2590 meshlink_errno = MESHLINK_ESTORAGE;
2591 free_node(mesh->self);
2594 } else if(!setup_network(mesh)) {
2595 meshlink_errno = MESHLINK_ENETWORK;
2599 /* Rebuild our own list of recent addresses */
2600 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2601 add_local_addresses(mesh);
2603 /* Write meshlink.conf with the updated port number */
2604 write_main_config_files(mesh);
2606 rval = config_sync(mesh, "current");
2609 pthread_mutex_unlock(&mesh->mutex);
2611 return rval && meshlink_get_port(mesh) == port;
2614 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2615 mesh->invitation_timeout = timeout;
2618 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2619 meshlink_submesh_t *s = NULL;
2622 meshlink_errno = MESHLINK_EINVAL;
2627 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2630 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2631 meshlink_errno = MESHLINK_EINVAL;
2635 s = (meshlink_submesh_t *)mesh->self->submesh;
2638 pthread_mutex_lock(&mesh->mutex);
2640 // Check validity of the new node's name
2641 if(!check_id(name)) {
2642 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2643 meshlink_errno = MESHLINK_EINVAL;
2644 pthread_mutex_unlock(&mesh->mutex);
2648 // Ensure no host configuration file with that name exists
2649 if(config_exists(mesh, "current", name)) {
2650 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2651 meshlink_errno = MESHLINK_EEXIST;
2652 pthread_mutex_unlock(&mesh->mutex);
2656 // Ensure no other nodes know about this name
2657 if(lookup_node(mesh, name)) {
2658 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2659 meshlink_errno = MESHLINK_EEXIST;
2660 pthread_mutex_unlock(&mesh->mutex);
2664 // Get the local address
2665 char *address = get_my_hostname(mesh, flags);
2668 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2669 meshlink_errno = MESHLINK_ERESOLV;
2670 pthread_mutex_unlock(&mesh->mutex);
2674 if(!refresh_invitation_key(mesh)) {
2675 meshlink_errno = MESHLINK_EINTERNAL;
2676 pthread_mutex_unlock(&mesh->mutex);
2680 // If we changed our own host config file, write it out now
2681 if(mesh->self->status.dirty) {
2682 if(!node_write_config(mesh, mesh->self)) {
2683 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2684 pthread_mutex_unlock(&mesh->mutex);
2691 // Create a hash of the key.
2692 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2693 sha512(fingerprint, strlen(fingerprint), hash);
2694 b64encode_urlsafe(hash, hash, 18);
2696 // Create a random cookie for this invitation.
2698 randomize(cookie, 18);
2700 // Create a filename that doesn't reveal the cookie itself
2701 char buf[18 + strlen(fingerprint)];
2702 char cookiehash[64];
2703 memcpy(buf, cookie, 18);
2704 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2705 sha512(buf, sizeof(buf), cookiehash);
2706 b64encode_urlsafe(cookiehash, cookiehash, 18);
2708 b64encode_urlsafe(cookie, cookie, 18);
2712 /* Construct the invitation file */
2713 uint8_t outbuf[4096];
2714 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2716 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2717 packmsg_add_str(&inv, name);
2718 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2719 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2721 /* TODO: Add several host config files to bootstrap connections.
2722 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2723 * and are not blacklisted.
2725 config_t configs[5];
2726 memset(configs, 0, sizeof(configs));
2729 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2733 /* Append host config files to the invitation file */
2734 packmsg_add_array(&inv, count);
2736 for(int i = 0; i < count; i++) {
2737 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2738 config_free(&configs[i]);
2741 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2743 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2744 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2745 meshlink_errno = MESHLINK_ESTORAGE;
2746 pthread_mutex_unlock(&mesh->mutex);
2750 // Create an URL from the local address, key hash and cookie
2752 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2755 pthread_mutex_unlock(&mesh->mutex);
2759 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2760 return meshlink_invite_ex(mesh, submesh, name, 0);
2763 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2764 if(!mesh || !invitation) {
2765 meshlink_errno = MESHLINK_EINVAL;
2769 join_state_t state = {
2774 ecdsa_t *key = NULL;
2775 ecdsa_t *hiskey = NULL;
2777 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2778 char copy[strlen(invitation) + 1];
2780 pthread_mutex_lock(&mesh->mutex);
2782 //Before doing meshlink_join make sure we are not connected to another mesh
2783 if(mesh->threadstarted) {
2784 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2785 meshlink_errno = MESHLINK_EINVAL;
2789 // 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.
2790 if(mesh->nodes->count > 1) {
2791 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2792 meshlink_errno = MESHLINK_EINVAL;
2796 strcpy(copy, invitation);
2798 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2800 char *slash = strchr(copy, '/');
2808 if(strlen(slash) != 48) {
2812 char *address = copy;
2815 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2819 if(mesh->inviter_commits_first) {
2820 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2823 // Generate a throw-away key for the invitation.
2824 key = ecdsa_generate();
2827 meshlink_errno = MESHLINK_EINTERNAL;
2831 char *b64key = ecdsa_get_base64_public_key(key);
2834 while(address && *address) {
2835 // We allow commas in the address part to support multiple addresses in one invitation URL.
2836 comma = strchr(address, ',');
2842 // Split of the port
2843 port = strrchr(address, ':');
2851 // IPv6 address are enclosed in brackets, per RFC 3986
2852 if(*address == '[') {
2854 char *bracket = strchr(address, ']');
2867 // Connect to the meshlink daemon mentioned in the URL.
2868 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2871 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2872 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2874 if(state.sock == -1) {
2875 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2876 meshlink_errno = MESHLINK_ENETWORK;
2880 set_timeout(state.sock, 5000);
2882 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2883 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2884 meshlink_errno = MESHLINK_ENETWORK;
2885 closesocket(state.sock);
2895 meshlink_errno = MESHLINK_ERESOLV;
2898 if(state.sock != -1 || !comma) {
2905 if(state.sock == -1) {
2909 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2911 // Tell him we have an invitation, and give him our throw-away key.
2915 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2916 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2917 meshlink_errno = MESHLINK_ENETWORK;
2923 char hisname[4096] = "";
2924 int code, hismajor, hisminor = 0;
2926 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) {
2927 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2928 meshlink_errno = MESHLINK_ENETWORK;
2932 // Check if the hash of the key he gave us matches the hash in the URL.
2933 char *fingerprint = state.line + 2;
2936 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2937 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2938 meshlink_errno = MESHLINK_EINTERNAL;
2942 if(memcmp(hishash, state.hash, 18)) {
2943 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2944 meshlink_errno = MESHLINK_EPEER;
2948 hiskey = ecdsa_set_base64_public_key(fingerprint);
2951 meshlink_errno = MESHLINK_EINTERNAL;
2955 // Start an SPTPS session
2956 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2957 meshlink_errno = MESHLINK_EINTERNAL;
2961 // Feed rest of input buffer to SPTPS
2962 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2963 meshlink_errno = MESHLINK_EPEER;
2968 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2970 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2972 if(errno == EINTR) {
2976 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2977 meshlink_errno = MESHLINK_ENETWORK;
2981 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2982 meshlink_errno = MESHLINK_EPEER;
2987 if(!state.success) {
2988 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2989 meshlink_errno = MESHLINK_EPEER;
2993 sptps_stop(&state.sptps);
2996 closesocket(state.sock);
2998 pthread_mutex_unlock(&mesh->mutex);
3002 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3003 meshlink_errno = MESHLINK_EINVAL;
3005 sptps_stop(&state.sptps);
3009 if(state.sock != -1) {
3010 closesocket(state.sock);
3013 pthread_mutex_unlock(&mesh->mutex);
3017 char *meshlink_export(meshlink_handle_t *mesh) {
3019 meshlink_errno = MESHLINK_EINVAL;
3023 // Create a config file on the fly.
3026 packmsg_output_t out = {buf, sizeof(buf)};
3027 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3028 packmsg_add_str(&out, mesh->name);
3029 packmsg_add_str(&out, CORE_MESH);
3031 pthread_mutex_lock(&mesh->mutex);
3033 packmsg_add_int32(&out, mesh->self->devclass);
3034 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3035 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3036 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3040 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3041 if(mesh->self->recent[i].sa.sa_family) {
3048 packmsg_add_array(&out, count);
3050 for(uint32_t i = 0; i < count; i++) {
3051 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3054 packmsg_add_int64(&out, 0);
3055 packmsg_add_int64(&out, 0);
3057 pthread_mutex_unlock(&mesh->mutex);
3059 if(!packmsg_output_ok(&out)) {
3060 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3061 meshlink_errno = MESHLINK_EINTERNAL;
3065 // Prepare a base64-encoded packmsg array containing our config file
3067 uint32_t len = packmsg_output_size(&out, buf);
3068 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3069 uint8_t *buf2 = xmalloc(len2);
3070 packmsg_output_t out2 = {buf2, len2};
3071 packmsg_add_array(&out2, 1);
3072 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3074 if(!packmsg_output_ok(&out2)) {
3075 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3076 meshlink_errno = MESHLINK_EINTERNAL;
3081 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3083 return (char *)buf2;
3086 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3087 if(!mesh || !data) {
3088 meshlink_errno = MESHLINK_EINVAL;
3092 size_t datalen = strlen(data);
3093 uint8_t *buf = xmalloc(datalen);
3094 int buflen = b64decode(data, buf, datalen);
3097 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3098 meshlink_errno = MESHLINK_EPEER;
3102 packmsg_input_t in = {buf, buflen};
3103 uint32_t count = packmsg_get_array(&in);
3106 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3107 meshlink_errno = MESHLINK_EPEER;
3111 pthread_mutex_lock(&mesh->mutex);
3115 uint32_t len = packmsg_get_bin_raw(&in, &data);
3121 packmsg_input_t in2 = {data, len};
3122 uint32_t version = packmsg_get_uint32(&in2);
3123 char *name = packmsg_get_str_dup(&in2);
3125 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3127 packmsg_input_invalidate(&in);
3131 if(!check_id(name)) {
3136 node_t *n = lookup_node(mesh, name);
3139 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3147 config_t config = {data, len};
3149 if(!node_read_from_config(mesh, n, &config)) {
3151 packmsg_input_invalidate(&in);
3155 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3156 n->last_reachable = 0;
3157 n->last_unreachable = 0;
3159 if(!node_write_config(mesh, n)) {
3167 pthread_mutex_unlock(&mesh->mutex);
3171 if(!packmsg_done(&in)) {
3172 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3173 meshlink_errno = MESHLINK_EPEER;
3177 if(!config_sync(mesh, "current")) {
3184 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3185 if(n == mesh->self) {
3186 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3187 meshlink_errno = MESHLINK_EINVAL;
3191 if(n->status.blacklisted) {
3192 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3196 n->status.blacklisted = true;
3198 /* Immediately shut down any connections we have with the blacklisted node.
3199 * We can't call terminate_connection(), because we might be called from a callback function.
3201 for list_each(connection_t, c, mesh->connections) {
3203 shutdown(c->socket, SHUT_RDWR);
3207 utcp_abort_all_connections(n->utcp);
3213 n->status.udp_confirmed = false;
3215 if(n->status.reachable) {
3216 n->last_unreachable = mesh->loop.now.tv_sec;
3219 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3220 * manually call the status callback if necessary.
3222 if(n->status.reachable && mesh->node_status_cb) {
3223 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3226 return node_write_config(mesh, n) && config_sync(mesh, "current");
3229 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3230 if(!mesh || !node) {
3231 meshlink_errno = MESHLINK_EINVAL;
3235 pthread_mutex_lock(&mesh->mutex);
3237 if(!blacklist(mesh, (node_t *)node)) {
3238 pthread_mutex_unlock(&mesh->mutex);
3242 pthread_mutex_unlock(&mesh->mutex);
3244 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3248 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3249 if(!mesh || !name) {
3250 meshlink_errno = MESHLINK_EINVAL;
3254 pthread_mutex_lock(&mesh->mutex);
3256 node_t *n = lookup_node(mesh, (char *)name);
3260 n->name = xstrdup(name);
3264 if(!blacklist(mesh, (node_t *)n)) {
3265 pthread_mutex_unlock(&mesh->mutex);
3269 pthread_mutex_unlock(&mesh->mutex);
3271 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3275 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3276 if(n == mesh->self) {
3277 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3278 meshlink_errno = MESHLINK_EINVAL;
3282 if(!n->status.blacklisted) {
3283 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3287 n->status.blacklisted = false;
3289 if(n->status.reachable) {
3290 n->last_reachable = mesh->loop.now.tv_sec;
3291 update_node_status(mesh, n);
3294 return node_write_config(mesh, n) && config_sync(mesh, "current");
3297 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3298 if(!mesh || !node) {
3299 meshlink_errno = MESHLINK_EINVAL;
3303 pthread_mutex_lock(&mesh->mutex);
3305 if(!whitelist(mesh, (node_t *)node)) {
3306 pthread_mutex_unlock(&mesh->mutex);
3310 pthread_mutex_unlock(&mesh->mutex);
3312 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3316 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3317 if(!mesh || !name) {
3318 meshlink_errno = MESHLINK_EINVAL;
3322 pthread_mutex_lock(&mesh->mutex);
3324 node_t *n = lookup_node(mesh, (char *)name);
3328 n->name = xstrdup(name);
3332 if(!whitelist(mesh, (node_t *)n)) {
3333 pthread_mutex_unlock(&mesh->mutex);
3337 pthread_mutex_unlock(&mesh->mutex);
3339 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3343 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3344 mesh->default_blacklist = blacklist;
3347 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3348 if(!mesh || !node) {
3349 meshlink_errno = MESHLINK_EINVAL;
3353 node_t *n = (node_t *)node;
3355 pthread_mutex_lock(&mesh->mutex);
3357 /* Check that the node is not reachable */
3358 if(n->status.reachable || n->connection) {
3359 pthread_mutex_unlock(&mesh->mutex);
3360 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3364 /* Check that we don't have any active UTCP connections */
3365 if(n->utcp && utcp_is_active(n->utcp)) {
3366 pthread_mutex_unlock(&mesh->mutex);
3367 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3371 /* Check that we have no active connections to this node */
3372 for list_each(connection_t, c, mesh->connections) {
3374 pthread_mutex_unlock(&mesh->mutex);
3375 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3380 /* Remove any pending outgoings to this node */
3381 if(mesh->outgoings) {
3382 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3383 if(outgoing->node == n) {
3384 list_delete_node(mesh->outgoings, node);
3389 /* Delete the config file for this node */
3390 if(!config_delete(mesh, "current", n->name)) {
3391 pthread_mutex_unlock(&mesh->mutex);
3395 /* Delete the node struct and any remaining edges referencing this node */
3398 pthread_mutex_unlock(&mesh->mutex);
3400 return config_sync(mesh, "current");
3403 /* Hint that a hostname may be found at an address
3404 * See header file for detailed comment.
3406 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3407 if(!mesh || !node || !addr) {
3408 meshlink_errno = EINVAL;
3412 pthread_mutex_lock(&mesh->mutex);
3414 node_t *n = (node_t *)node;
3416 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3417 if(!node_write_config(mesh, n)) {
3418 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3422 pthread_mutex_unlock(&mesh->mutex);
3423 // @TODO do we want to fire off a connection attempt right away?
3426 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3428 node_t *n = utcp->priv;
3429 meshlink_handle_t *mesh = n->mesh;
3430 return mesh->channel_accept_cb;
3433 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3435 if(aio->cb.buffer) {
3436 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3440 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3445 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3446 meshlink_channel_t *channel = connection->priv;
3452 node_t *n = channel->node;
3453 meshlink_handle_t *mesh = n->mesh;
3455 if(n->status.destroyed) {
3456 meshlink_channel_close(mesh, channel);
3460 const char *p = data;
3463 while(channel->aio_receive) {
3464 meshlink_aio_buffer_t *aio = channel->aio_receive;
3465 size_t todo = aio->len - aio->done;
3472 memcpy((char *)aio->data + aio->done, p, todo);
3474 ssize_t result = write(aio->fd, p, todo);
3483 if(aio->done == aio->len) {
3484 channel->aio_receive = aio->next;
3485 aio_signal(mesh, channel, aio);
3497 if(channel->receive_cb) {
3498 channel->receive_cb(mesh, channel, p, left);
3504 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3505 node_t *n = utcp_connection->utcp->priv;
3511 meshlink_handle_t *mesh = n->mesh;
3513 if(!mesh->channel_accept_cb) {
3517 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3519 channel->c = utcp_connection;
3521 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3522 utcp_accept(utcp_connection, channel_recv, channel);
3528 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3529 node_t *n = utcp->priv;
3531 if(n->status.destroyed) {
3535 meshlink_handle_t *mesh = n->mesh;
3536 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3539 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3540 if(!mesh || !channel) {
3541 meshlink_errno = MESHLINK_EINVAL;
3545 channel->receive_cb = cb;
3548 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3550 node_t *n = (node_t *)source;
3556 utcp_recv(n->utcp, data, len);
3559 static void channel_poll(struct utcp_connection *connection, size_t len) {
3560 meshlink_channel_t *channel = connection->priv;
3566 node_t *n = channel->node;
3567 meshlink_handle_t *mesh = n->mesh;
3568 meshlink_aio_buffer_t *aio = channel->aio_send;
3571 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3572 size_t left = aio->len - aio->done;
3580 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3583 size_t todo = utcp_get_sndbuf_free(connection);
3589 if(todo > sizeof(buf)) {
3593 ssize_t result = read(aio->fd, buf, todo);
3596 sent = utcp_send(connection, buf, result);
3606 /* If the buffer is now completely sent, call the callback and dispose of it. */
3607 if(aio->done >= aio->len) {
3608 channel->aio_send = aio->next;
3609 aio_signal(mesh, channel, aio);
3613 if(channel->poll_cb) {
3614 channel->poll_cb(mesh, channel, len);
3616 utcp_set_poll_cb(connection, NULL);
3621 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3622 if(!mesh || !channel) {
3623 meshlink_errno = MESHLINK_EINVAL;
3627 pthread_mutex_lock(&mesh->mutex);
3628 channel->poll_cb = cb;
3629 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3630 pthread_mutex_unlock(&mesh->mutex);
3633 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3635 meshlink_errno = MESHLINK_EINVAL;
3639 pthread_mutex_lock(&mesh->mutex);
3640 mesh->channel_accept_cb = cb;
3641 mesh->receive_cb = channel_receive;
3643 for splay_each(node_t, n, mesh->nodes) {
3644 if(!n->utcp && n != mesh->self) {
3645 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3649 pthread_mutex_unlock(&mesh->mutex);
3652 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3656 meshlink_errno = MESHLINK_EINVAL;
3660 pthread_mutex_lock(&mesh->mutex);
3661 utcp_set_sndbuf(channel->c, size);
3662 pthread_mutex_unlock(&mesh->mutex);
3665 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3669 meshlink_errno = MESHLINK_EINVAL;
3673 pthread_mutex_lock(&mesh->mutex);
3674 utcp_set_rcvbuf(channel->c, size);
3675 pthread_mutex_unlock(&mesh->mutex);
3678 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) {
3680 abort(); // TODO: handle non-NULL data
3683 if(!mesh || !node) {
3684 meshlink_errno = MESHLINK_EINVAL;
3688 pthread_mutex_lock(&mesh->mutex);
3690 node_t *n = (node_t *)node;
3693 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3694 mesh->receive_cb = channel_receive;
3697 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3698 pthread_mutex_unlock(&mesh->mutex);
3703 if(n->status.blacklisted) {
3704 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3705 meshlink_errno = MESHLINK_EBLACKLISTED;
3706 pthread_mutex_unlock(&mesh->mutex);
3710 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3712 channel->receive_cb = cb;
3715 channel->priv = (void *)data;
3718 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3720 pthread_mutex_unlock(&mesh->mutex);
3723 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3731 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) {
3732 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3735 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3736 if(!mesh || !channel) {
3737 meshlink_errno = MESHLINK_EINVAL;
3741 pthread_mutex_lock(&mesh->mutex);
3742 utcp_shutdown(channel->c, direction);
3743 pthread_mutex_unlock(&mesh->mutex);
3746 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3747 if(!mesh || !channel) {
3748 meshlink_errno = MESHLINK_EINVAL;
3752 pthread_mutex_lock(&mesh->mutex);
3754 utcp_close(channel->c);
3756 /* Clean up any outstanding AIO buffers. */
3757 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3759 aio_signal(mesh, channel, aio);
3763 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3765 aio_signal(mesh, channel, aio);
3769 pthread_mutex_unlock(&mesh->mutex);
3774 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3775 if(!mesh || !channel) {
3776 meshlink_errno = MESHLINK_EINVAL;
3785 meshlink_errno = MESHLINK_EINVAL;
3789 // TODO: more finegrained locking.
3790 // Ideally we want to put the data into the UTCP connection's send buffer.
3791 // Then, preferably only if there is room in the receiver window,
3792 // kick the meshlink thread to go send packets.
3796 pthread_mutex_lock(&mesh->mutex);
3798 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3799 if(channel->aio_send) {
3802 retval = utcp_send(channel->c, data, len);
3805 pthread_mutex_unlock(&mesh->mutex);
3808 meshlink_errno = MESHLINK_ENETWORK;
3814 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) {
3815 if(!mesh || !channel) {
3816 meshlink_errno = MESHLINK_EINVAL;
3821 meshlink_errno = MESHLINK_EINVAL;
3825 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3828 aio->cb.buffer = cb;
3831 pthread_mutex_lock(&mesh->mutex);
3833 /* Append the AIO buffer descriptor to the end of the chain */
3834 meshlink_aio_buffer_t **p = &channel->aio_send;
3842 /* Ensure the poll callback is set, and call it right now to push data if possible */
3843 utcp_set_poll_cb(channel->c, channel_poll);
3844 channel_poll(channel->c, len);
3846 pthread_mutex_unlock(&mesh->mutex);
3851 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) {
3852 if(!mesh || !channel) {
3853 meshlink_errno = MESHLINK_EINVAL;
3857 if(!len || fd == -1) {
3858 meshlink_errno = MESHLINK_EINVAL;
3862 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3868 pthread_mutex_lock(&mesh->mutex);
3870 /* Append the AIO buffer descriptor to the end of the chain */
3871 meshlink_aio_buffer_t **p = &channel->aio_send;
3879 /* Ensure the poll callback is set, and call it right now to push data if possible */
3880 utcp_set_poll_cb(channel->c, channel_poll);
3881 channel_poll(channel->c, len);
3883 pthread_mutex_unlock(&mesh->mutex);
3888 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) {
3889 if(!mesh || !channel) {
3890 meshlink_errno = MESHLINK_EINVAL;
3895 meshlink_errno = MESHLINK_EINVAL;
3899 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3902 aio->cb.buffer = cb;
3905 pthread_mutex_lock(&mesh->mutex);
3907 /* Append the AIO buffer descriptor to the end of the chain */
3908 meshlink_aio_buffer_t **p = &channel->aio_receive;
3916 pthread_mutex_unlock(&mesh->mutex);
3921 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) {
3922 if(!mesh || !channel) {
3923 meshlink_errno = MESHLINK_EINVAL;
3927 if(!len || fd == -1) {
3928 meshlink_errno = MESHLINK_EINVAL;
3932 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3938 pthread_mutex_lock(&mesh->mutex);
3940 /* Append the AIO buffer descriptor to the end of the chain */
3941 meshlink_aio_buffer_t **p = &channel->aio_receive;
3949 pthread_mutex_unlock(&mesh->mutex);
3954 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3955 if(!mesh || !channel) {
3956 meshlink_errno = MESHLINK_EINVAL;
3960 return channel->c->flags;
3963 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3964 if(!mesh || !channel) {
3965 meshlink_errno = MESHLINK_EINVAL;
3969 return utcp_get_sendq(channel->c);
3972 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3973 if(!mesh || !channel) {
3974 meshlink_errno = MESHLINK_EINVAL;
3978 return utcp_get_recvq(channel->c);
3981 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3982 if(!mesh || !node) {
3983 meshlink_errno = MESHLINK_EINVAL;
3987 node_t *n = (node_t *)node;
3989 pthread_mutex_lock(&mesh->mutex);
3992 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3995 utcp_set_user_timeout(n->utcp, timeout);
3997 pthread_mutex_unlock(&mesh->mutex);
4000 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4001 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4002 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4005 if(mesh->node_status_cb) {
4006 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4009 if(mesh->node_pmtu_cb) {
4010 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4014 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4015 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4016 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4020 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4021 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4025 n->status.duplicate = true;
4026 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4029 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4033 meshlink_errno = MESHLINK_EINVAL;
4037 pthread_mutex_lock(&mesh->mutex);
4039 if(mesh->discovery == enable) {
4043 if(mesh->threadstarted) {
4045 discovery_start(mesh);
4047 discovery_stop(mesh);
4051 mesh->discovery = enable;
4054 pthread_mutex_unlock(&mesh->mutex);
4058 meshlink_errno = MESHLINK_ENOTSUP;
4062 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4063 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4064 meshlink_errno = EINVAL;
4068 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4069 meshlink_errno = EINVAL;
4073 pthread_mutex_lock(&mesh->mutex);
4074 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4075 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4076 pthread_mutex_unlock(&mesh->mutex);
4079 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4080 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4081 meshlink_errno = EINVAL;
4085 if(fast_retry_period < 0) {
4086 meshlink_errno = EINVAL;
4090 pthread_mutex_lock(&mesh->mutex);
4091 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4092 pthread_mutex_unlock(&mesh->mutex);
4095 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4097 meshlink_errno = EINVAL;
4101 pthread_mutex_lock(&mesh->mutex);
4102 mesh->inviter_commits_first = inviter_commits_first;
4103 pthread_mutex_unlock(&mesh->mutex);
4106 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4108 meshlink_errno = EINVAL;
4112 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4113 meshlink_errno = EINVAL;
4117 pthread_mutex_lock(&mesh->mutex);
4118 free(mesh->external_address_url);
4119 mesh->external_address_url = url ? xstrdup(url) : NULL;
4120 pthread_mutex_unlock(&mesh->mutex);
4123 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4126 if(!mesh->connections || !mesh->loop.running) {
4133 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
4134 // We should only call the callback function if we are in the background thread.
4135 if(!mesh->error_cb) {
4139 if(!mesh->threadstarted) {
4143 if(mesh->thread == pthread_self()) {
4144 mesh->error_cb(mesh, meshlink_errno);
4148 static void __attribute__((constructor)) meshlink_init(void) {
4152 static void __attribute__((destructor)) meshlink_exit(void) {