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.
27 #include "meshlink_internal.h"
39 #include "ed25519/sha512.h"
40 #include "discovery.h"
45 #define MSG_NOSIGNAL 0
47 __thread meshlink_errno_t meshlink_errno;
48 meshlink_log_cb_t global_log_cb;
49 meshlink_log_level_t global_log_level;
51 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
53 static int rstrip(char *value) {
54 int len = strlen(value);
56 while(len && strchr("\t\r\n ", value[len - 1])) {
63 static void get_canonical_address(node_t *n, char **hostname, char **port) {
64 if(!n->canonical_address) {
68 *hostname = xstrdup(n->canonical_address);
69 char *space = strchr(*hostname, ' ');
73 *port = xstrdup(space);
77 static bool is_valid_hostname(const char *hostname) {
82 for(const char *p = hostname; *p; p++) {
83 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
91 static bool is_valid_port(const char *port) {
98 unsigned long int result = strtoul(port, &end, 10);
99 return result && result < 65536 && !*end;
102 for(const char *p = port; *p; p++) {
103 if(!(isalnum(*p) || *p == '-')) {
111 static void set_timeout(int sock, int timeout) {
116 tv.tv_sec = timeout / 1000;
117 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
119 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
120 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
123 struct socket_in_netns_params {
132 static void *socket_in_netns_thread(void *arg) {
133 struct socket_in_netns_params *params = arg;
135 if(setns(params->netns, CLONE_NEWNET) == -1) {
136 meshlink_errno = MESHLINK_EINVAL;
140 params->fd = socket(params->domain, params->type, params->protocol);
146 static int socket_in_netns(int domain, int type, int protocol, int netns) {
148 return socket(domain, type, protocol);
152 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
156 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
157 pthread_join(thr, NULL);
167 // Find out what local address a socket would use if we connect to the given address.
168 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
169 // of both endpoints, but this will actually not send any UDP packet.
170 static bool getlocaladdr(char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
171 struct addrinfo *rai = NULL;
172 const struct addrinfo hint = {
173 .ai_family = AF_UNSPEC,
174 .ai_socktype = SOCK_DGRAM,
175 .ai_protocol = IPPROTO_UDP,
176 .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
179 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
183 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
190 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
198 if(getsockname(sock, &sa->sa, salen)) {
207 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
209 socklen_t salen = sizeof(sa);
211 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
215 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
222 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
223 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
226 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
227 const char *url = mesh->external_address_url;
230 url = "http://meshlink.io/host.cgi";
233 /* Find the hostname part between the slashes */
234 if(strncmp(url, "http://", 7)) {
236 meshlink_errno = MESHLINK_EINTERNAL;
240 const char *begin = url + 7;
242 const char *end = strchr(begin, '/');
245 end = begin + strlen(begin);
249 char host[end - begin + 1];
250 strncpy(host, begin, end - begin);
251 host[end - begin] = 0;
253 char *port = strchr(host, ':');
259 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
260 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), 5);
262 char *hostname = NULL;
264 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
265 if(family != AF_UNSPEC && aip->ai_family != family) {
269 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
272 set_timeout(s, 5000);
274 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
281 send(s, "GET ", 4, 0);
282 send(s, url, strlen(url), 0);
283 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
284 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
289 if(line[len - 1] == '\n') {
293 char *p = strrchr(line, '\n');
296 hostname = xstrdup(p + 1);
312 // Check that the hostname is reasonable
313 if(hostname && !is_valid_hostname(hostname)) {
319 meshlink_errno = MESHLINK_ERESOLV;
325 static bool is_localaddr(sockaddr_t *sa) {
326 switch(sa->sa.sa_family) {
328 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
331 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
332 return first == 0 || (first & 0xffc0) == 0xfe80;
340 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
343 // Determine address of the local interface used for outgoing connections.
344 char localaddr[NI_MAXHOST];
345 bool success = false;
347 if(family == AF_INET) {
348 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
349 } else if(family == AF_INET6) {
350 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
353 #ifdef HAVE_GETIFADDRS
356 struct ifaddrs *ifa = NULL;
359 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
360 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
362 if(sa->sa.sa_family != family) {
366 if(is_localaddr(sa)) {
370 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
382 meshlink_errno = MESHLINK_ENETWORK;
386 return xstrdup(localaddr);
389 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
390 for(int i = 0; i < n; i++) {
395 // Ignore duplicate hostnames
398 for(int j = 0; j < i; j++) {
403 if(strcmp(host[i], host[j])) {
407 if(strcmp(port[i], port[j])) {
415 if(found || !is_valid_hostname(host[i])) {
425 // This gets the hostname part for use in invitation URLs
426 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
427 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
429 char *hostname[count];
431 char *hostport = NULL;
433 memset(hostname, 0, sizeof(hostname));
434 memset(port, 0, sizeof(port));
436 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
437 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
440 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
441 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
444 // Add all explicitly set invitation addresses
445 if(mesh->invitation_addresses) {
446 for list_each(char, combo, mesh->invitation_addresses) {
447 hostname[n] = xstrdup(combo);
448 char *slash = strrchr(hostname[n], '/');
452 port[n] = xstrdup(slash + 1);
459 // Add local addresses if requested
460 if(flags & MESHLINK_INVITE_LOCAL) {
461 if(flags & MESHLINK_INVITE_IPV4) {
462 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
465 if(flags & MESHLINK_INVITE_IPV6) {
466 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
470 // Add public/canonical addresses if requested
471 if(flags & MESHLINK_INVITE_PUBLIC) {
472 // Try the CanonicalAddress first
473 get_canonical_address(mesh->self, &hostname[n], &port[n]);
475 if(!hostname[n] && count == 4) {
476 if(flags & MESHLINK_INVITE_IPV4) {
477 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
480 if(flags & MESHLINK_INVITE_IPV6) {
481 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
488 for(int i = 0; i < n; i++) {
489 // Ensure we always have a port number
490 if(hostname[i] && !port[i]) {
491 port[i] = xstrdup(mesh->myport);
495 remove_duplicate_hostnames(hostname, port, n);
497 // Resolve the hostnames
498 for(int i = 0; i < n; i++) {
503 // Convert what we have to a sockaddr
504 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), 5);
510 // Remember the address(es)
511 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
512 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
519 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
520 remove_duplicate_hostnames(hostname, port, n);
522 // Concatenate all unique address to the hostport string
523 for(int i = 0; i < n; i++) {
528 // Append the address to the hostport string
530 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
532 hostport = newhostport;
541 static bool try_bind(meshlink_handle_t *mesh, int port) {
542 struct addrinfo *ai = NULL;
543 struct addrinfo hint = {
544 .ai_flags = AI_PASSIVE,
545 .ai_family = AF_UNSPEC,
546 .ai_socktype = SOCK_STREAM,
547 .ai_protocol = IPPROTO_TCP,
551 snprintf(portstr, sizeof(portstr), "%d", port);
553 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
557 bool success = false;
559 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
560 /* Try to bind to TCP. */
562 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
565 if(errno == EADDRINUSE) {
566 /* If this port is in use for any address family, avoid it. */
574 /* If TCP worked, then we require that UDP works as well. */
576 int udp_fd = setup_udp_listen_socket(mesh, aip);
593 int check_port(meshlink_handle_t *mesh) {
594 for(int i = 0; i < 1000; i++) {
595 int port = 0x1000 + prng(mesh, 0x8000);
597 if(try_bind(mesh, port)) {
599 xasprintf(&mesh->myport, "%d", port);
604 meshlink_errno = MESHLINK_ENETWORK;
605 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
609 static bool write_main_config_files(meshlink_handle_t *mesh) {
610 if(!mesh->confbase) {
616 /* Write the main config file */
617 packmsg_output_t out = {buf, sizeof buf};
619 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
620 packmsg_add_str(&out, mesh->name);
621 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
622 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
623 packmsg_add_uint16(&out, atoi(mesh->myport));
625 if(!packmsg_output_ok(&out)) {
629 config_t config = {buf, packmsg_output_size(&out, buf)};
631 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
635 /* Write our own host config file */
636 if(!node_write_config(mesh, mesh->self)) {
644 meshlink_handle_t *mesh;
646 char cookie[18 + 32];
657 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
658 meshlink_handle_t *mesh = state->mesh;
659 packmsg_input_t in = {buf, len};
660 uint32_t version = packmsg_get_uint32(&in);
662 if(version != MESHLINK_INVITATION_VERSION) {
663 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
667 char *name = packmsg_get_str_dup(&in);
668 char *submesh_name = packmsg_get_str_dup(&in);
669 dev_class_t devclass = packmsg_get_int32(&in);
670 uint32_t count = packmsg_get_array(&in);
672 if(!name || !check_id(name)) {
673 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
679 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
680 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
687 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
694 free(mesh->self->name);
696 mesh->self->name = xstrdup(name);
697 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
699 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
701 // Initialize configuration directory
702 if(!config_init(mesh, "current")) {
706 if(!write_main_config_files(mesh)) {
710 // Write host config files
711 for(uint32_t i = 0; i < count; i++) {
713 uint32_t len = packmsg_get_bin_raw(&in, &data);
716 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
720 packmsg_input_t in2 = {data, len};
721 uint32_t version = packmsg_get_uint32(&in2);
722 char *name = packmsg_get_str_dup(&in2);
724 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
726 packmsg_input_invalidate(&in);
730 if(!check_id(name)) {
735 if(!strcmp(name, mesh->name)) {
736 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
738 meshlink_errno = MESHLINK_EPEER;
742 node_t *n = new_node();
745 config_t config = {data, len};
747 if(!node_read_from_config(mesh, n, &config)) {
749 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
750 meshlink_errno = MESHLINK_EPEER;
755 /* The first host config file is of the inviter itself;
756 * remember the address we are currently using for the invitation connection.
759 socklen_t salen = sizeof(sa);
761 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
762 node_add_recent_address(mesh, n, &sa);
766 /* Clear the reachability times, since we ourself have never seen these nodes yet */
767 n->last_reachable = 0;
768 n->last_unreachable = 0;
770 if(!node_write_config(mesh, n)) {
778 /* Ensure the configuration directory metadata is on disk */
779 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
783 if(!mesh->inviter_commits_first) {
784 devtool_set_inviter_commits_first(false);
787 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
789 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
794 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
796 join_state_t *state = handle;
797 const char *ptr = data;
800 int result = send(state->sock, ptr, len, 0);
802 if(result == -1 && errno == EINTR) {
804 } else if(result <= 0) {
815 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
816 join_state_t *state = handle;
817 meshlink_handle_t *mesh = state->mesh;
819 if(mesh->inviter_commits_first) {
821 case SPTPS_HANDSHAKE:
822 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
828 if(!finalize_join(state, msg, len)) {
832 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
833 shutdown(state->sock, SHUT_RDWR);
834 state->success = true;
842 case SPTPS_HANDSHAKE:
843 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
846 return finalize_join(state, msg, len);
849 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
850 shutdown(state->sock, SHUT_RDWR);
851 state->success = true;
862 static bool recvline(join_state_t *state) {
863 char *newline = NULL;
865 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
866 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
868 if(result == -1 && errno == EINTR) {
870 } else if(result <= 0) {
874 state->blen += result;
877 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
881 size_t len = newline - state->buffer;
883 memcpy(state->line, state->buffer, len);
884 state->line[len] = 0;
885 memmove(state->buffer, newline + 1, state->blen - len - 1);
886 state->blen -= len + 1;
891 static bool sendline(int fd, char *format, ...) {
897 va_start(ap, format);
898 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
901 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
909 int result = send(fd, p, blen, MSG_NOSIGNAL);
911 if(result == -1 && errno == EINTR) {
913 } else if(result <= 0) {
924 static const char *errstr[] = {
925 [MESHLINK_OK] = "No error",
926 [MESHLINK_EINVAL] = "Invalid argument",
927 [MESHLINK_ENOMEM] = "Out of memory",
928 [MESHLINK_ENOENT] = "No such node",
929 [MESHLINK_EEXIST] = "Node already exists",
930 [MESHLINK_EINTERNAL] = "Internal error",
931 [MESHLINK_ERESOLV] = "Could not resolve hostname",
932 [MESHLINK_ESTORAGE] = "Storage error",
933 [MESHLINK_ENETWORK] = "Network error",
934 [MESHLINK_EPEER] = "Error communicating with peer",
935 [MESHLINK_ENOTSUP] = "Operation not supported",
936 [MESHLINK_EBUSY] = "MeshLink instance already in use",
937 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
940 const char *meshlink_strerror(meshlink_errno_t err) {
941 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
942 return "Invalid error code";
948 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
949 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
951 mesh->private_key = ecdsa_generate();
952 mesh->invitation_key = ecdsa_generate();
954 if(!mesh->private_key || !mesh->invitation_key) {
955 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
956 meshlink_errno = MESHLINK_EINTERNAL;
960 logger(mesh, MESHLINK_DEBUG, "Done.\n");
965 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
966 if(a->tv_sec == b->tv_sec) {
967 return a->tv_nsec < b->tv_nsec;
969 return a->tv_sec < b->tv_sec;
973 static struct timespec idle(event_loop_t *loop, void *data) {
975 meshlink_handle_t *mesh = data;
976 struct timespec t, tmin = {3600, 0};
978 for splay_each(node_t, n, mesh->nodes) {
983 t = utcp_timeout(n->utcp);
985 if(timespec_lt(&t, &tmin)) {
993 // Get our local address(es) by simulating connecting to an Internet host.
994 static void add_local_addresses(meshlink_handle_t *mesh) {
996 sa.storage.ss_family = AF_UNKNOWN;
997 socklen_t salen = sizeof(sa);
1001 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1002 sa.in.sin_port = ntohs(atoi(mesh->myport));
1003 node_add_recent_address(mesh, mesh->self, &sa);
1010 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1011 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1012 node_add_recent_address(mesh, mesh->self, &sa);
1016 static bool meshlink_setup(meshlink_handle_t *mesh) {
1017 if(!config_destroy(mesh->confbase, "new")) {
1018 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1019 meshlink_errno = MESHLINK_ESTORAGE;
1023 if(!config_destroy(mesh->confbase, "old")) {
1024 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1025 meshlink_errno = MESHLINK_ESTORAGE;
1029 if(!config_init(mesh, "current")) {
1030 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1031 meshlink_errno = MESHLINK_ESTORAGE;
1035 if(!ecdsa_keygen(mesh)) {
1036 meshlink_errno = MESHLINK_EINTERNAL;
1040 if(check_port(mesh) == 0) {
1041 meshlink_errno = MESHLINK_ENETWORK;
1045 /* Create a node for ourself */
1047 mesh->self = new_node();
1048 mesh->self->name = xstrdup(mesh->name);
1049 mesh->self->devclass = mesh->devclass;
1050 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1051 mesh->self->session_id = mesh->session_id;
1053 if(!write_main_config_files(mesh)) {
1054 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1055 meshlink_errno = MESHLINK_ESTORAGE;
1059 /* Ensure the configuration directory metadata is on disk */
1060 if(!config_sync(mesh, "current")) {
1067 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1070 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1071 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1075 packmsg_input_t in = {config.buf, config.len};
1076 const void *private_key;
1077 const void *invitation_key;
1079 uint32_t version = packmsg_get_uint32(&in);
1080 char *name = packmsg_get_str_dup(&in);
1081 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1082 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1083 uint16_t myport = packmsg_get_uint16(&in);
1085 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1086 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1088 config_free(&config);
1092 if(mesh->name && strcmp(mesh->name, name)) {
1093 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1094 meshlink_errno = MESHLINK_ESTORAGE;
1096 config_free(&config);
1102 xasprintf(&mesh->myport, "%u", myport);
1103 mesh->private_key = ecdsa_set_private_key(private_key);
1104 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1105 config_free(&config);
1107 /* Create a node for ourself and read our host configuration file */
1109 mesh->self = new_node();
1110 mesh->self->name = xstrdup(name);
1111 mesh->self->devclass = mesh->devclass;
1112 mesh->self->session_id = mesh->session_id;
1114 if(!node_read_public_key(mesh, mesh->self)) {
1115 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1116 meshlink_errno = MESHLINK_ESTORAGE;
1117 free_node(mesh->self);
1126 static void *setup_network_in_netns_thread(void *arg) {
1127 meshlink_handle_t *mesh = arg;
1129 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1133 bool success = setup_network(mesh);
1134 return success ? arg : NULL;
1136 #endif // HAVE_SETNS
1138 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1139 if(!confbase || !*confbase) {
1140 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1141 meshlink_errno = MESHLINK_EINVAL;
1145 if(!appname || !*appname) {
1146 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1147 meshlink_errno = MESHLINK_EINVAL;
1151 if(strchr(appname, ' ')) {
1152 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1153 meshlink_errno = MESHLINK_EINVAL;
1157 if(name && !check_id(name)) {
1158 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1159 meshlink_errno = MESHLINK_EINVAL;
1163 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1164 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1165 meshlink_errno = MESHLINK_EINVAL;
1169 meshlink_open_params_t *params = xzalloc(sizeof * params);
1171 params->confbase = xstrdup(confbase);
1172 params->name = name ? xstrdup(name) : NULL;
1173 params->appname = xstrdup(appname);
1174 params->devclass = devclass;
1180 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1182 meshlink_errno = MESHLINK_EINVAL;
1186 params->netns = netns;
1191 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1193 meshlink_errno = MESHLINK_EINVAL;
1197 if((!key && keylen) || (key && !keylen)) {
1198 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1199 meshlink_errno = MESHLINK_EINVAL;
1204 params->keylen = keylen;
1209 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1210 if(!mesh || !new_key || !new_keylen) {
1211 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1212 meshlink_errno = MESHLINK_EINVAL;
1216 pthread_mutex_lock(&mesh->mutex);
1218 // Create hash for the new key
1219 void *new_config_key;
1220 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1222 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1223 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1224 meshlink_errno = MESHLINK_EINTERNAL;
1225 pthread_mutex_unlock(&mesh->mutex);
1229 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1231 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1232 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1233 meshlink_errno = MESHLINK_ESTORAGE;
1234 pthread_mutex_unlock(&mesh->mutex);
1238 devtool_keyrotate_probe(1);
1240 // Rename confbase/current/ to confbase/old
1242 if(!config_rename(mesh, "current", "old")) {
1243 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1244 meshlink_errno = MESHLINK_ESTORAGE;
1245 pthread_mutex_unlock(&mesh->mutex);
1249 devtool_keyrotate_probe(2);
1251 // Rename confbase/new/ to confbase/current
1253 if(!config_rename(mesh, "new", "current")) {
1254 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1255 meshlink_errno = MESHLINK_ESTORAGE;
1256 pthread_mutex_unlock(&mesh->mutex);
1260 devtool_keyrotate_probe(3);
1262 // Cleanup the "old" confbase sub-directory
1264 if(!config_destroy(mesh->confbase, "old")) {
1265 pthread_mutex_unlock(&mesh->mutex);
1269 // Change the mesh handle key with new key
1271 free(mesh->config_key);
1272 mesh->config_key = new_config_key;
1274 pthread_mutex_unlock(&mesh->mutex);
1279 void meshlink_open_params_free(meshlink_open_params_t *params) {
1281 meshlink_errno = MESHLINK_EINVAL;
1285 free(params->confbase);
1287 free(params->appname);
1292 /// Device class traits
1293 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1294 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1295 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1296 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1297 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1300 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1301 if(!confbase || !*confbase) {
1302 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1303 meshlink_errno = MESHLINK_EINVAL;
1307 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1308 meshlink_open_params_t params;
1309 memset(¶ms, 0, sizeof(params));
1311 params.confbase = (char *)confbase;
1312 params.name = (char *)name;
1313 params.appname = (char *)appname;
1314 params.devclass = devclass;
1317 return meshlink_open_ex(¶ms);
1320 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) {
1321 if(!confbase || !*confbase) {
1322 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1323 meshlink_errno = MESHLINK_EINVAL;
1327 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1328 meshlink_open_params_t params;
1329 memset(¶ms, 0, sizeof(params));
1331 params.confbase = (char *)confbase;
1332 params.name = (char *)name;
1333 params.appname = (char *)appname;
1334 params.devclass = devclass;
1337 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1341 return meshlink_open_ex(¶ms);
1344 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1346 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1347 meshlink_errno = MESHLINK_EINVAL;
1351 if(!check_id(name)) {
1352 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1353 meshlink_errno = MESHLINK_EINVAL;
1357 if(!appname || !*appname) {
1358 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1359 meshlink_errno = MESHLINK_EINVAL;
1363 if(strchr(appname, ' ')) {
1364 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1365 meshlink_errno = MESHLINK_EINVAL;
1369 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1370 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1371 meshlink_errno = MESHLINK_EINVAL;
1375 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1376 meshlink_open_params_t params;
1377 memset(¶ms, 0, sizeof(params));
1379 params.name = (char *)name;
1380 params.appname = (char *)appname;
1381 params.devclass = devclass;
1384 return meshlink_open_ex(¶ms);
1387 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1388 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1390 // Validate arguments provided by the application
1391 if(!params->appname || !*params->appname) {
1392 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1393 meshlink_errno = MESHLINK_EINVAL;
1397 if(strchr(params->appname, ' ')) {
1398 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1399 meshlink_errno = MESHLINK_EINVAL;
1403 if(params->name && !check_id(params->name)) {
1404 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1405 meshlink_errno = MESHLINK_EINVAL;
1409 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1410 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1411 meshlink_errno = MESHLINK_EINVAL;
1415 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1416 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1417 meshlink_errno = MESHLINK_EINVAL;
1421 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1423 if(params->confbase) {
1424 mesh->confbase = xstrdup(params->confbase);
1427 mesh->appname = xstrdup(params->appname);
1428 mesh->devclass = params->devclass;
1429 mesh->discovery = true;
1430 mesh->invitation_timeout = 604800; // 1 week
1431 mesh->netns = params->netns;
1432 mesh->submeshes = NULL;
1433 mesh->log_cb = global_log_cb;
1434 mesh->log_level = global_log_level;
1435 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1437 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1440 randomize(&mesh->session_id, sizeof(mesh->session_id));
1441 } while(mesh->session_id == 0);
1443 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1445 mesh->name = params->name ? xstrdup(params->name) : NULL;
1449 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1451 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1452 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1453 meshlink_close(mesh);
1454 meshlink_errno = MESHLINK_EINTERNAL;
1460 pthread_mutexattr_t attr;
1461 pthread_mutexattr_init(&attr);
1462 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1463 pthread_mutex_init(&mesh->mutex, &attr);
1465 mesh->threadstarted = false;
1466 event_loop_init(&mesh->loop);
1467 mesh->loop.data = mesh;
1469 meshlink_queue_init(&mesh->outpacketqueue);
1471 // Atomically lock the configuration directory.
1472 if(!main_config_lock(mesh)) {
1473 meshlink_close(mesh);
1477 // If no configuration exists yet, create it.
1479 if(!meshlink_confbase_exists(mesh)) {
1481 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1482 meshlink_close(mesh);
1483 meshlink_errno = MESHLINK_ESTORAGE;
1487 if(!meshlink_setup(mesh)) {
1488 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1489 meshlink_close(mesh);
1493 if(!meshlink_read_config(mesh)) {
1494 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1495 meshlink_close(mesh);
1501 struct WSAData wsa_state;
1502 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1505 // Setup up everything
1506 // TODO: we should not open listening sockets yet
1508 bool success = false;
1510 if(mesh->netns != -1) {
1514 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1515 void *retval = NULL;
1516 success = pthread_join(thr, &retval) == 0 && retval;
1520 meshlink_errno = MESHLINK_EINTERNAL;
1523 #endif // HAVE_SETNS
1525 success = setup_network(mesh);
1529 meshlink_close(mesh);
1530 meshlink_errno = MESHLINK_ENETWORK;
1534 add_local_addresses(mesh);
1536 if(!node_write_config(mesh, mesh->self)) {
1537 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1541 idle_set(&mesh->loop, idle, mesh);
1543 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1547 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1548 meshlink_submesh_t *s = NULL;
1551 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1552 meshlink_errno = MESHLINK_EINVAL;
1556 if(!submesh || !*submesh) {
1557 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1558 meshlink_errno = MESHLINK_EINVAL;
1563 pthread_mutex_lock(&mesh->mutex);
1565 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1567 pthread_mutex_unlock(&mesh->mutex);
1572 static void *meshlink_main_loop(void *arg) {
1573 meshlink_handle_t *mesh = arg;
1575 if(mesh->netns != -1) {
1578 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1579 pthread_cond_signal(&mesh->cond);
1584 pthread_cond_signal(&mesh->cond);
1586 #endif // HAVE_SETNS
1591 if(mesh->discovery) {
1592 discovery_start(mesh);
1597 pthread_mutex_lock(&mesh->mutex);
1599 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1600 pthread_cond_broadcast(&mesh->cond);
1602 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1604 pthread_mutex_unlock(&mesh->mutex);
1609 if(mesh->discovery) {
1610 discovery_stop(mesh);
1618 bool meshlink_start(meshlink_handle_t *mesh) {
1620 meshlink_errno = MESHLINK_EINVAL;
1624 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1626 pthread_mutex_lock(&mesh->mutex);
1629 assert(mesh->private_key);
1630 assert(mesh->self->ecdsa);
1631 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1633 if(mesh->threadstarted) {
1634 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1635 pthread_mutex_unlock(&mesh->mutex);
1639 if(mesh->listen_socket[0].tcp.fd < 0) {
1640 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1641 meshlink_errno = MESHLINK_ENETWORK;
1645 // TODO: open listening sockets first
1647 //Check that a valid name is set
1649 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1650 meshlink_errno = MESHLINK_EINVAL;
1651 pthread_mutex_unlock(&mesh->mutex);
1655 init_outgoings(mesh);
1658 // Start the main thread
1660 event_loop_start(&mesh->loop);
1662 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1663 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1664 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1665 meshlink_errno = MESHLINK_EINTERNAL;
1666 event_loop_stop(&mesh->loop);
1667 pthread_mutex_unlock(&mesh->mutex);
1671 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1672 mesh->threadstarted = true;
1674 // Ensure we are considered reachable
1677 pthread_mutex_unlock(&mesh->mutex);
1681 void meshlink_stop(meshlink_handle_t *mesh) {
1683 meshlink_errno = MESHLINK_EINVAL;
1687 pthread_mutex_lock(&mesh->mutex);
1688 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1690 // Shut down the main thread
1691 event_loop_stop(&mesh->loop);
1693 // Send ourselves a UDP packet to kick the event loop
1694 for(int i = 0; i < mesh->listen_sockets; i++) {
1696 socklen_t salen = sizeof(sa);
1698 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1699 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1703 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1704 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1708 if(mesh->threadstarted) {
1709 // Wait for the main thread to finish
1710 pthread_mutex_unlock(&mesh->mutex);
1711 pthread_join(mesh->thread, NULL);
1712 pthread_mutex_lock(&mesh->mutex);
1714 mesh->threadstarted = false;
1717 // Close all metaconnections
1718 if(mesh->connections) {
1719 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1721 connection_t *c = node->data;
1723 terminate_connection(mesh, c, false);
1728 exit_outgoings(mesh);
1730 // Ensure we are considered unreachable
1735 // Try to write out any changed node config files, ignore errors at this point.
1737 for splay_each(node_t, n, mesh->nodes) {
1738 if(n->status.dirty) {
1739 n->status.dirty = !node_write_config(mesh, n);
1744 pthread_mutex_unlock(&mesh->mutex);
1747 void meshlink_close(meshlink_handle_t *mesh) {
1749 meshlink_errno = MESHLINK_EINVAL;
1753 // stop can be called even if mesh has not been started
1754 meshlink_stop(mesh);
1756 // lock is not released after this
1757 pthread_mutex_lock(&mesh->mutex);
1759 // Close and free all resources used.
1761 close_network_connections(mesh);
1763 logger(mesh, MESHLINK_INFO, "Terminating");
1765 event_loop_exit(&mesh->loop);
1769 if(mesh->confbase) {
1775 ecdsa_free(mesh->invitation_key);
1777 if(mesh->netns != -1) {
1781 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1785 meshlink_queue_exit(&mesh->outpacketqueue);
1788 free(mesh->appname);
1789 free(mesh->confbase);
1790 free(mesh->config_key);
1791 free(mesh->external_address_url);
1793 ecdsa_free(mesh->private_key);
1795 if(mesh->invitation_addresses) {
1796 list_delete_list(mesh->invitation_addresses);
1799 main_config_unlock(mesh);
1801 pthread_mutex_unlock(&mesh->mutex);
1802 pthread_mutex_destroy(&mesh->mutex);
1804 memset(mesh, 0, sizeof(*mesh));
1809 bool meshlink_destroy(const char *confbase) {
1811 meshlink_errno = MESHLINK_EINVAL;
1815 /* Exit early if the confbase directory itself doesn't exist */
1816 if(access(confbase, F_OK) && errno == ENOENT) {
1820 /* Take the lock the same way meshlink_open() would. */
1821 char lockfilename[PATH_MAX];
1822 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1824 FILE *lockfile = fopen(lockfilename, "w+");
1827 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1828 meshlink_errno = MESHLINK_ESTORAGE;
1833 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1837 // TODO: use _locking()?
1840 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1841 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1843 meshlink_errno = MESHLINK_EBUSY;
1849 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1850 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1854 if(unlink(lockfilename)) {
1855 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1857 meshlink_errno = MESHLINK_ESTORAGE;
1863 if(!sync_path(confbase)) {
1864 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1865 meshlink_errno = MESHLINK_ESTORAGE;
1872 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1874 meshlink_errno = MESHLINK_EINVAL;
1878 pthread_mutex_lock(&mesh->mutex);
1879 mesh->receive_cb = cb;
1880 pthread_mutex_unlock(&mesh->mutex);
1883 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1885 meshlink_errno = MESHLINK_EINVAL;
1889 pthread_mutex_lock(&mesh->mutex);
1890 mesh->connection_try_cb = cb;
1891 pthread_mutex_unlock(&mesh->mutex);
1894 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1896 meshlink_errno = MESHLINK_EINVAL;
1900 pthread_mutex_lock(&mesh->mutex);
1901 mesh->node_status_cb = cb;
1902 pthread_mutex_unlock(&mesh->mutex);
1905 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1907 meshlink_errno = MESHLINK_EINVAL;
1911 pthread_mutex_lock(&mesh->mutex);
1912 mesh->node_pmtu_cb = cb;
1913 pthread_mutex_unlock(&mesh->mutex);
1916 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1918 meshlink_errno = MESHLINK_EINVAL;
1922 pthread_mutex_lock(&mesh->mutex);
1923 mesh->node_duplicate_cb = cb;
1924 pthread_mutex_unlock(&mesh->mutex);
1927 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1929 pthread_mutex_lock(&mesh->mutex);
1931 mesh->log_level = cb ? level : 0;
1932 pthread_mutex_unlock(&mesh->mutex);
1935 global_log_level = cb ? level : 0;
1939 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1941 meshlink_errno = MESHLINK_EINVAL;
1945 pthread_mutex_lock(&mesh->mutex);
1946 mesh->error_cb = cb;
1947 pthread_mutex_unlock(&mesh->mutex);
1950 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
1951 meshlink_packethdr_t *hdr;
1953 if(len > MAXSIZE - sizeof(*hdr)) {
1954 meshlink_errno = MESHLINK_EINVAL;
1958 node_t *n = (node_t *)destination;
1960 if(n->status.blacklisted) {
1961 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1962 meshlink_errno = MESHLINK_EBLACKLISTED;
1966 // Prepare the packet
1967 packet->probe = false;
1968 packet->tcp = false;
1969 packet->len = len + sizeof(*hdr);
1971 hdr = (meshlink_packethdr_t *)packet->data;
1972 memset(hdr, 0, sizeof(*hdr));
1973 // leave the last byte as 0 to make sure strings are always
1974 // null-terminated if they are longer than the buffer
1975 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
1976 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
1978 memcpy(packet->data + sizeof(*hdr), data, len);
1983 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1985 assert(destination);
1989 // Prepare the packet
1990 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
1994 // Send it immediately
1995 route(mesh, mesh->self, mesh->packet);
2000 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2001 // Validate arguments
2002 if(!mesh || !destination) {
2003 meshlink_errno = MESHLINK_EINVAL;
2012 meshlink_errno = MESHLINK_EINVAL;
2016 // Prepare the packet
2017 vpn_packet_t *packet = malloc(sizeof(*packet));
2020 meshlink_errno = MESHLINK_ENOMEM;
2024 if(!prepare_packet(mesh, destination, data, len, packet)) {
2030 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2032 meshlink_errno = MESHLINK_ENOMEM;
2036 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2038 // Notify event loop
2039 signal_trigger(&mesh->loop, &mesh->datafromapp);
2044 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2046 meshlink_handle_t *mesh = data;
2048 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2050 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2051 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2052 mesh->self->in_packets++;
2053 mesh->self->in_bytes += packet->len;
2054 route(mesh, mesh->self, packet);
2059 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2060 if(!mesh || !destination) {
2061 meshlink_errno = MESHLINK_EINVAL;
2065 pthread_mutex_lock(&mesh->mutex);
2067 node_t *n = (node_t *)destination;
2069 if(!n->status.reachable) {
2070 pthread_mutex_unlock(&mesh->mutex);
2073 } else if(n->mtuprobes > 30 && n->minmtu) {
2074 pthread_mutex_unlock(&mesh->mutex);
2077 pthread_mutex_unlock(&mesh->mutex);
2082 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2083 if(!mesh || !node) {
2084 meshlink_errno = MESHLINK_EINVAL;
2088 pthread_mutex_lock(&mesh->mutex);
2090 node_t *n = (node_t *)node;
2092 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2093 meshlink_errno = MESHLINK_EINTERNAL;
2094 pthread_mutex_unlock(&mesh->mutex);
2098 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2101 meshlink_errno = MESHLINK_EINTERNAL;
2104 pthread_mutex_unlock(&mesh->mutex);
2108 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2110 meshlink_errno = MESHLINK_EINVAL;
2114 return (meshlink_node_t *)mesh->self;
2117 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2118 if(!mesh || !name) {
2119 meshlink_errno = MESHLINK_EINVAL;
2125 pthread_mutex_lock(&mesh->mutex);
2126 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2127 pthread_mutex_unlock(&mesh->mutex);
2130 meshlink_errno = MESHLINK_ENOENT;
2133 return (meshlink_node_t *)n;
2136 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2137 if(!mesh || !name) {
2138 meshlink_errno = MESHLINK_EINVAL;
2142 meshlink_submesh_t *submesh = NULL;
2144 pthread_mutex_lock(&mesh->mutex);
2145 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2146 pthread_mutex_unlock(&mesh->mutex);
2149 meshlink_errno = MESHLINK_ENOENT;
2155 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2156 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2157 meshlink_errno = MESHLINK_EINVAL;
2161 meshlink_node_t **result;
2164 pthread_mutex_lock(&mesh->mutex);
2166 *nmemb = mesh->nodes->count;
2167 result = realloc(nodes, *nmemb * sizeof(*nodes));
2170 meshlink_node_t **p = result;
2172 for splay_each(node_t, n, mesh->nodes) {
2173 *p++ = (meshlink_node_t *)n;
2178 meshlink_errno = MESHLINK_ENOMEM;
2181 pthread_mutex_unlock(&mesh->mutex);
2186 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) {
2187 meshlink_node_t **result;
2189 pthread_mutex_lock(&mesh->mutex);
2193 for splay_each(node_t, n, mesh->nodes) {
2194 if(search_node(n, condition)) {
2201 pthread_mutex_unlock(&mesh->mutex);
2205 result = realloc(nodes, *nmemb * sizeof(*nodes));
2208 meshlink_node_t **p = result;
2210 for splay_each(node_t, n, mesh->nodes) {
2211 if(search_node(n, condition)) {
2212 *p++ = (meshlink_node_t *)n;
2218 meshlink_errno = MESHLINK_ENOMEM;
2221 pthread_mutex_unlock(&mesh->mutex);
2226 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2227 dev_class_t *devclass = (dev_class_t *)condition;
2229 if(*devclass == (dev_class_t)node->devclass) {
2236 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2237 if(condition == node->submesh) {
2249 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2250 const struct time_range *range = condition;
2251 time_t start = node->last_reachable;
2252 time_t end = node->last_unreachable;
2262 if(range->end >= range->start) {
2263 return start <= range->end && end >= range->start;
2265 return start > range->start || end < range->end;
2269 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) {
2270 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2271 meshlink_errno = MESHLINK_EINVAL;
2275 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2278 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2279 if(!mesh || !submesh || !nmemb) {
2280 meshlink_errno = MESHLINK_EINVAL;
2284 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2287 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) {
2288 if(!mesh || !nmemb) {
2289 meshlink_errno = MESHLINK_EINVAL;
2293 struct time_range range = {start, end};
2295 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2298 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2299 if(!mesh || !node) {
2300 meshlink_errno = MESHLINK_EINVAL;
2304 dev_class_t devclass;
2306 pthread_mutex_lock(&mesh->mutex);
2308 devclass = ((node_t *)node)->devclass;
2310 pthread_mutex_unlock(&mesh->mutex);
2315 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2316 if(!mesh || !node) {
2317 meshlink_errno = MESHLINK_EINVAL;
2321 node_t *n = (node_t *)node;
2323 meshlink_submesh_t *s;
2325 s = (meshlink_submesh_t *)n->submesh;
2330 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2331 if(!mesh || !node) {
2332 meshlink_errno = MESHLINK_EINVAL;
2336 node_t *n = (node_t *)node;
2339 pthread_mutex_lock(&mesh->mutex);
2340 reachable = n->status.reachable && !n->status.blacklisted;
2342 if(last_reachable) {
2343 *last_reachable = n->last_reachable;
2346 if(last_unreachable) {
2347 *last_unreachable = n->last_unreachable;
2350 pthread_mutex_unlock(&mesh->mutex);
2355 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2356 if(!mesh || !data || !len || !signature || !siglen) {
2357 meshlink_errno = MESHLINK_EINVAL;
2361 if(*siglen < MESHLINK_SIGLEN) {
2362 meshlink_errno = MESHLINK_EINVAL;
2366 pthread_mutex_lock(&mesh->mutex);
2368 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2369 meshlink_errno = MESHLINK_EINTERNAL;
2370 pthread_mutex_unlock(&mesh->mutex);
2374 *siglen = MESHLINK_SIGLEN;
2375 pthread_mutex_unlock(&mesh->mutex);
2379 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2380 if(!mesh || !source || !data || !len || !signature) {
2381 meshlink_errno = MESHLINK_EINVAL;
2385 if(siglen != MESHLINK_SIGLEN) {
2386 meshlink_errno = MESHLINK_EINVAL;
2390 pthread_mutex_lock(&mesh->mutex);
2394 struct node_t *n = (struct node_t *)source;
2396 if(!node_read_public_key(mesh, n)) {
2397 meshlink_errno = MESHLINK_EINTERNAL;
2400 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2403 pthread_mutex_unlock(&mesh->mutex);
2407 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2408 pthread_mutex_lock(&mesh->mutex);
2410 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2413 // TODO: Update invitation key if necessary?
2416 pthread_mutex_unlock(&mesh->mutex);
2418 return mesh->invitation_key;
2421 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2422 if(!mesh || !node || !address) {
2423 meshlink_errno = MESHLINK_EINVAL;
2427 if(!is_valid_hostname(address)) {
2428 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2429 meshlink_errno = MESHLINK_EINVAL;
2433 if((node_t *)node != mesh->self && !port) {
2434 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2435 meshlink_errno = MESHLINK_EINVAL;
2440 if(port && !is_valid_port(port)) {
2441 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2442 meshlink_errno = MESHLINK_EINVAL;
2446 char *canonical_address;
2449 xasprintf(&canonical_address, "%s %s", address, port);
2451 canonical_address = xstrdup(address);
2454 pthread_mutex_lock(&mesh->mutex);
2456 node_t *n = (node_t *)node;
2457 free(n->canonical_address);
2458 n->canonical_address = canonical_address;
2460 if(!node_write_config(mesh, n)) {
2461 pthread_mutex_unlock(&mesh->mutex);
2465 pthread_mutex_unlock(&mesh->mutex);
2467 return config_sync(mesh, "current");
2470 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2471 if(!mesh || !address) {
2472 meshlink_errno = MESHLINK_EINVAL;
2476 if(!is_valid_hostname(address)) {
2477 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2478 meshlink_errno = MESHLINK_EINVAL;
2482 if(port && !is_valid_port(port)) {
2483 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2484 meshlink_errno = MESHLINK_EINVAL;
2491 xasprintf(&combo, "%s/%s", address, port);
2493 combo = xstrdup(address);
2496 pthread_mutex_lock(&mesh->mutex);
2498 if(!mesh->invitation_addresses) {
2499 mesh->invitation_addresses = list_alloc((list_action_t)free);
2502 list_insert_tail(mesh->invitation_addresses, combo);
2503 pthread_mutex_unlock(&mesh->mutex);
2508 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2510 meshlink_errno = MESHLINK_EINVAL;
2514 pthread_mutex_lock(&mesh->mutex);
2516 if(mesh->invitation_addresses) {
2517 list_delete_list(mesh->invitation_addresses);
2518 mesh->invitation_addresses = NULL;
2521 pthread_mutex_unlock(&mesh->mutex);
2524 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2525 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2528 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2530 meshlink_errno = MESHLINK_EINVAL;
2534 char *address = meshlink_get_external_address(mesh);
2540 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2546 int meshlink_get_port(meshlink_handle_t *mesh) {
2548 meshlink_errno = MESHLINK_EINVAL;
2553 meshlink_errno = MESHLINK_EINTERNAL;
2559 pthread_mutex_lock(&mesh->mutex);
2560 port = atoi(mesh->myport);
2561 pthread_mutex_unlock(&mesh->mutex);
2566 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2567 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2568 meshlink_errno = MESHLINK_EINVAL;
2572 if(mesh->myport && port == atoi(mesh->myport)) {
2576 if(!try_bind(mesh, port)) {
2577 meshlink_errno = MESHLINK_ENETWORK;
2581 devtool_trybind_probe();
2585 pthread_mutex_lock(&mesh->mutex);
2587 if(mesh->threadstarted) {
2588 meshlink_errno = MESHLINK_EINVAL;
2593 xasprintf(&mesh->myport, "%d", port);
2595 /* Close down the network. This also deletes mesh->self. */
2596 close_network_connections(mesh);
2598 /* Recreate mesh->self. */
2599 mesh->self = new_node();
2600 mesh->self->name = xstrdup(mesh->name);
2601 mesh->self->devclass = mesh->devclass;
2602 mesh->self->session_id = mesh->session_id;
2603 xasprintf(&mesh->myport, "%d", port);
2605 if(!node_read_public_key(mesh, mesh->self)) {
2606 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2607 meshlink_errno = MESHLINK_ESTORAGE;
2608 free_node(mesh->self);
2611 } else if(!setup_network(mesh)) {
2612 meshlink_errno = MESHLINK_ENETWORK;
2616 /* Rebuild our own list of recent addresses */
2617 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2618 add_local_addresses(mesh);
2620 /* Write meshlink.conf with the updated port number */
2621 write_main_config_files(mesh);
2623 rval = config_sync(mesh, "current");
2626 pthread_mutex_unlock(&mesh->mutex);
2628 return rval && meshlink_get_port(mesh) == port;
2631 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2632 mesh->invitation_timeout = timeout;
2635 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2636 meshlink_submesh_t *s = NULL;
2639 meshlink_errno = MESHLINK_EINVAL;
2644 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2647 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2648 meshlink_errno = MESHLINK_EINVAL;
2652 s = (meshlink_submesh_t *)mesh->self->submesh;
2655 pthread_mutex_lock(&mesh->mutex);
2657 // Check validity of the new node's name
2658 if(!check_id(name)) {
2659 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2660 meshlink_errno = MESHLINK_EINVAL;
2661 pthread_mutex_unlock(&mesh->mutex);
2665 // Ensure no host configuration file with that name exists
2666 if(config_exists(mesh, "current", name)) {
2667 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2668 meshlink_errno = MESHLINK_EEXIST;
2669 pthread_mutex_unlock(&mesh->mutex);
2673 // Ensure no other nodes know about this name
2674 if(lookup_node(mesh, name)) {
2675 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2676 meshlink_errno = MESHLINK_EEXIST;
2677 pthread_mutex_unlock(&mesh->mutex);
2681 // Get the local address
2682 char *address = get_my_hostname(mesh, flags);
2685 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2686 meshlink_errno = MESHLINK_ERESOLV;
2687 pthread_mutex_unlock(&mesh->mutex);
2691 if(!refresh_invitation_key(mesh)) {
2692 meshlink_errno = MESHLINK_EINTERNAL;
2693 pthread_mutex_unlock(&mesh->mutex);
2697 // If we changed our own host config file, write it out now
2698 if(mesh->self->status.dirty) {
2699 if(!node_write_config(mesh, mesh->self)) {
2700 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2701 pthread_mutex_unlock(&mesh->mutex);
2708 // Create a hash of the key.
2709 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2710 sha512(fingerprint, strlen(fingerprint), hash);
2711 b64encode_urlsafe(hash, hash, 18);
2713 // Create a random cookie for this invitation.
2715 randomize(cookie, 18);
2717 // Create a filename that doesn't reveal the cookie itself
2718 char buf[18 + strlen(fingerprint)];
2719 char cookiehash[64];
2720 memcpy(buf, cookie, 18);
2721 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2722 sha512(buf, sizeof(buf), cookiehash);
2723 b64encode_urlsafe(cookiehash, cookiehash, 18);
2725 b64encode_urlsafe(cookie, cookie, 18);
2729 /* Construct the invitation file */
2730 uint8_t outbuf[4096];
2731 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2733 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2734 packmsg_add_str(&inv, name);
2735 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2736 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2738 /* TODO: Add several host config files to bootstrap connections.
2739 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2740 * and are not blacklisted.
2742 config_t configs[5];
2743 memset(configs, 0, sizeof(configs));
2746 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2750 /* Append host config files to the invitation file */
2751 packmsg_add_array(&inv, count);
2753 for(int i = 0; i < count; i++) {
2754 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2755 config_free(&configs[i]);
2758 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2760 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2761 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2762 meshlink_errno = MESHLINK_ESTORAGE;
2763 pthread_mutex_unlock(&mesh->mutex);
2767 // Create an URL from the local address, key hash and cookie
2769 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2772 pthread_mutex_unlock(&mesh->mutex);
2776 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2777 return meshlink_invite_ex(mesh, submesh, name, 0);
2780 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2781 if(!mesh || !invitation) {
2782 meshlink_errno = MESHLINK_EINVAL;
2786 join_state_t state = {
2791 ecdsa_t *key = NULL;
2792 ecdsa_t *hiskey = NULL;
2794 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2795 char copy[strlen(invitation) + 1];
2797 pthread_mutex_lock(&mesh->mutex);
2799 //Before doing meshlink_join make sure we are not connected to another mesh
2800 if(mesh->threadstarted) {
2801 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2802 meshlink_errno = MESHLINK_EINVAL;
2806 // 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.
2807 if(mesh->nodes->count > 1) {
2808 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2809 meshlink_errno = MESHLINK_EINVAL;
2813 strcpy(copy, invitation);
2815 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2817 char *slash = strchr(copy, '/');
2825 if(strlen(slash) != 48) {
2829 char *address = copy;
2832 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2836 if(mesh->inviter_commits_first) {
2837 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2840 // Generate a throw-away key for the invitation.
2841 key = ecdsa_generate();
2844 meshlink_errno = MESHLINK_EINTERNAL;
2848 char *b64key = ecdsa_get_base64_public_key(key);
2851 while(address && *address) {
2852 // We allow commas in the address part to support multiple addresses in one invitation URL.
2853 comma = strchr(address, ',');
2859 // Split of the port
2860 port = strrchr(address, ':');
2868 // IPv6 address are enclosed in brackets, per RFC 3986
2869 if(*address == '[') {
2871 char *bracket = strchr(address, ']');
2884 // Connect to the meshlink daemon mentioned in the URL.
2885 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), 5);
2888 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2889 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2891 if(state.sock == -1) {
2892 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2893 meshlink_errno = MESHLINK_ENETWORK;
2897 set_timeout(state.sock, 5000);
2899 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2900 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2901 meshlink_errno = MESHLINK_ENETWORK;
2902 closesocket(state.sock);
2912 meshlink_errno = MESHLINK_ERESOLV;
2915 if(state.sock != -1 || !comma) {
2922 if(state.sock == -1) {
2926 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2928 // Tell him we have an invitation, and give him our throw-away key.
2932 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2933 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2934 meshlink_errno = MESHLINK_ENETWORK;
2940 char hisname[4096] = "";
2941 int code, hismajor, hisminor = 0;
2943 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) {
2944 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2945 meshlink_errno = MESHLINK_ENETWORK;
2949 // Check if the hash of the key he gave us matches the hash in the URL.
2950 char *fingerprint = state.line + 2;
2953 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2954 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2955 meshlink_errno = MESHLINK_EINTERNAL;
2959 if(memcmp(hishash, state.hash, 18)) {
2960 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2961 meshlink_errno = MESHLINK_EPEER;
2965 hiskey = ecdsa_set_base64_public_key(fingerprint);
2968 meshlink_errno = MESHLINK_EINTERNAL;
2972 // Start an SPTPS session
2973 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2974 meshlink_errno = MESHLINK_EINTERNAL;
2978 // Feed rest of input buffer to SPTPS
2979 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2980 meshlink_errno = MESHLINK_EPEER;
2985 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2987 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2989 if(errno == EINTR) {
2993 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2994 meshlink_errno = MESHLINK_ENETWORK;
2998 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2999 meshlink_errno = MESHLINK_EPEER;
3004 if(!state.success) {
3005 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3006 meshlink_errno = MESHLINK_EPEER;
3010 sptps_stop(&state.sptps);
3013 closesocket(state.sock);
3015 pthread_mutex_unlock(&mesh->mutex);
3019 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3020 meshlink_errno = MESHLINK_EINVAL;
3022 sptps_stop(&state.sptps);
3026 if(state.sock != -1) {
3027 closesocket(state.sock);
3030 pthread_mutex_unlock(&mesh->mutex);
3034 char *meshlink_export(meshlink_handle_t *mesh) {
3036 meshlink_errno = MESHLINK_EINVAL;
3040 // Create a config file on the fly.
3043 packmsg_output_t out = {buf, sizeof(buf)};
3044 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3045 packmsg_add_str(&out, mesh->name);
3046 packmsg_add_str(&out, CORE_MESH);
3048 pthread_mutex_lock(&mesh->mutex);
3050 packmsg_add_int32(&out, mesh->self->devclass);
3051 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3052 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3054 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3055 char *canonical_address = NULL;
3056 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3057 packmsg_add_str(&out, canonical_address);
3058 free(canonical_address);
3060 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3065 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3066 if(mesh->self->recent[i].sa.sa_family) {
3073 packmsg_add_array(&out, count);
3075 for(uint32_t i = 0; i < count; i++) {
3076 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3079 packmsg_add_int64(&out, 0);
3080 packmsg_add_int64(&out, 0);
3082 pthread_mutex_unlock(&mesh->mutex);
3084 if(!packmsg_output_ok(&out)) {
3085 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3086 meshlink_errno = MESHLINK_EINTERNAL;
3090 // Prepare a base64-encoded packmsg array containing our config file
3092 uint32_t len = packmsg_output_size(&out, buf);
3093 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3094 uint8_t *buf2 = xmalloc(len2);
3095 packmsg_output_t out2 = {buf2, len2};
3096 packmsg_add_array(&out2, 1);
3097 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3099 if(!packmsg_output_ok(&out2)) {
3100 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3101 meshlink_errno = MESHLINK_EINTERNAL;
3106 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3108 return (char *)buf2;
3111 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3112 if(!mesh || !data) {
3113 meshlink_errno = MESHLINK_EINVAL;
3117 size_t datalen = strlen(data);
3118 uint8_t *buf = xmalloc(datalen);
3119 int buflen = b64decode(data, buf, datalen);
3122 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3123 meshlink_errno = MESHLINK_EPEER;
3127 packmsg_input_t in = {buf, buflen};
3128 uint32_t count = packmsg_get_array(&in);
3131 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3132 meshlink_errno = MESHLINK_EPEER;
3136 pthread_mutex_lock(&mesh->mutex);
3140 uint32_t len = packmsg_get_bin_raw(&in, &data);
3146 packmsg_input_t in2 = {data, len};
3147 uint32_t version = packmsg_get_uint32(&in2);
3148 char *name = packmsg_get_str_dup(&in2);
3150 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3152 packmsg_input_invalidate(&in);
3156 if(!check_id(name)) {
3161 node_t *n = lookup_node(mesh, name);
3164 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3172 config_t config = {data, len};
3174 if(!node_read_from_config(mesh, n, &config)) {
3176 packmsg_input_invalidate(&in);
3180 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3181 n->last_reachable = 0;
3182 n->last_unreachable = 0;
3184 if(!node_write_config(mesh, n)) {
3192 pthread_mutex_unlock(&mesh->mutex);
3196 if(!packmsg_done(&in)) {
3197 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3198 meshlink_errno = MESHLINK_EPEER;
3202 if(!config_sync(mesh, "current")) {
3209 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3210 if(n == mesh->self) {
3211 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3212 meshlink_errno = MESHLINK_EINVAL;
3216 if(n->status.blacklisted) {
3217 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3221 n->status.blacklisted = true;
3223 /* Immediately shut down any connections we have with the blacklisted node.
3224 * We can't call terminate_connection(), because we might be called from a callback function.
3226 for list_each(connection_t, c, mesh->connections) {
3228 shutdown(c->socket, SHUT_RDWR);
3232 utcp_abort_all_connections(n->utcp);
3238 n->status.udp_confirmed = false;
3240 if(n->status.reachable) {
3241 n->last_unreachable = time(NULL);
3244 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3245 * manually call the status callback if necessary.
3247 if(n->status.reachable && mesh->node_status_cb) {
3248 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3251 return node_write_config(mesh, n) && config_sync(mesh, "current");
3254 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3255 if(!mesh || !node) {
3256 meshlink_errno = MESHLINK_EINVAL;
3260 pthread_mutex_lock(&mesh->mutex);
3262 if(!blacklist(mesh, (node_t *)node)) {
3263 pthread_mutex_unlock(&mesh->mutex);
3267 pthread_mutex_unlock(&mesh->mutex);
3269 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3273 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3274 if(!mesh || !name) {
3275 meshlink_errno = MESHLINK_EINVAL;
3279 pthread_mutex_lock(&mesh->mutex);
3281 node_t *n = lookup_node(mesh, (char *)name);
3285 n->name = xstrdup(name);
3289 if(!blacklist(mesh, (node_t *)n)) {
3290 pthread_mutex_unlock(&mesh->mutex);
3294 pthread_mutex_unlock(&mesh->mutex);
3296 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3300 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3301 if(n == mesh->self) {
3302 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3303 meshlink_errno = MESHLINK_EINVAL;
3307 if(!n->status.blacklisted) {
3308 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3312 n->status.blacklisted = false;
3314 if(n->status.reachable) {
3315 n->last_reachable = time(NULL);
3316 update_node_status(mesh, n);
3319 return node_write_config(mesh, n) && config_sync(mesh, "current");
3322 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3323 if(!mesh || !node) {
3324 meshlink_errno = MESHLINK_EINVAL;
3328 pthread_mutex_lock(&mesh->mutex);
3330 if(!whitelist(mesh, (node_t *)node)) {
3331 pthread_mutex_unlock(&mesh->mutex);
3335 pthread_mutex_unlock(&mesh->mutex);
3337 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3341 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3342 if(!mesh || !name) {
3343 meshlink_errno = MESHLINK_EINVAL;
3347 pthread_mutex_lock(&mesh->mutex);
3349 node_t *n = lookup_node(mesh, (char *)name);
3353 n->name = xstrdup(name);
3357 if(!whitelist(mesh, (node_t *)n)) {
3358 pthread_mutex_unlock(&mesh->mutex);
3362 pthread_mutex_unlock(&mesh->mutex);
3364 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3368 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3369 mesh->default_blacklist = blacklist;
3372 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3373 if(!mesh || !node) {
3374 meshlink_errno = MESHLINK_EINVAL;
3378 node_t *n = (node_t *)node;
3380 pthread_mutex_lock(&mesh->mutex);
3382 /* Check that the node is not reachable */
3383 if(n->status.reachable || n->connection) {
3384 pthread_mutex_unlock(&mesh->mutex);
3385 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3389 /* Check that we don't have any active UTCP connections */
3390 if(n->utcp && utcp_is_active(n->utcp)) {
3391 pthread_mutex_unlock(&mesh->mutex);
3392 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3396 /* Check that we have no active connections to this node */
3397 for list_each(connection_t, c, mesh->connections) {
3399 pthread_mutex_unlock(&mesh->mutex);
3400 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3405 /* Remove any pending outgoings to this node */
3406 if(mesh->outgoings) {
3407 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3408 if(outgoing->node == n) {
3409 list_delete_node(mesh->outgoings, node);
3414 /* Delete the config file for this node */
3415 if(!config_delete(mesh, "current", n->name)) {
3416 pthread_mutex_unlock(&mesh->mutex);
3420 /* Delete the node struct and any remaining edges referencing this node */
3423 pthread_mutex_unlock(&mesh->mutex);
3425 return config_sync(mesh, "current");
3428 /* Hint that a hostname may be found at an address
3429 * See header file for detailed comment.
3431 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3432 if(!mesh || !node || !addr) {
3433 meshlink_errno = EINVAL;
3437 pthread_mutex_lock(&mesh->mutex);
3439 node_t *n = (node_t *)node;
3441 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3442 if(!node_write_config(mesh, n)) {
3443 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3447 pthread_mutex_unlock(&mesh->mutex);
3448 // @TODO do we want to fire off a connection attempt right away?
3451 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3453 node_t *n = utcp->priv;
3454 meshlink_handle_t *mesh = n->mesh;
3455 return mesh->channel_accept_cb;
3458 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3460 if(aio->cb.buffer) {
3461 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3465 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3470 static void aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **aio) {
3472 meshlink_aio_buffer_t *next = (*aio)->next;
3473 aio_signal(mesh, channel, *aio);
3479 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3480 meshlink_channel_t *channel = connection->priv;
3486 node_t *n = channel->node;
3487 meshlink_handle_t *mesh = n->mesh;
3489 if(n->status.destroyed) {
3490 meshlink_channel_close(mesh, channel);
3494 const char *p = data;
3497 while(channel->aio_receive) {
3499 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3500 aio_abort(mesh, channel, &channel->aio_receive);
3504 meshlink_aio_buffer_t *aio = channel->aio_receive;
3505 size_t todo = aio->len - aio->done;
3512 memcpy((char *)aio->data + aio->done, p, todo);
3514 ssize_t result = write(aio->fd, p, todo);
3517 /* Writing to fd failed, cancel just this AIO buffer. */
3518 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3519 channel->aio_receive = aio->next;
3520 aio_signal(mesh, channel, aio);
3532 if(aio->done == aio->len) {
3533 channel->aio_receive = aio->next;
3534 aio_signal(mesh, channel, aio);
3543 if(channel->receive_cb) {
3544 channel->receive_cb(mesh, channel, p, left);
3550 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3551 node_t *n = utcp_connection->utcp->priv;
3557 meshlink_handle_t *mesh = n->mesh;
3559 if(!mesh->channel_accept_cb) {
3563 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3565 channel->c = utcp_connection;
3567 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3568 utcp_accept(utcp_connection, channel_recv, channel);
3574 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3575 node_t *n = utcp_connection->utcp->priv;
3576 meshlink_handle_t *mesh = n->mesh;
3578 if(n->mtuprobes == 31) {
3579 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3585 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3586 node_t *n = utcp->priv;
3588 if(n->status.destroyed) {
3592 meshlink_handle_t *mesh = n->mesh;
3593 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3596 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3597 if(!mesh || !channel) {
3598 meshlink_errno = MESHLINK_EINVAL;
3602 channel->receive_cb = cb;
3605 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3607 node_t *n = (node_t *)source;
3613 utcp_recv(n->utcp, data, len);
3616 static void channel_poll(struct utcp_connection *connection, size_t len) {
3617 meshlink_channel_t *channel = connection->priv;
3623 node_t *n = channel->node;
3624 meshlink_handle_t *mesh = n->mesh;
3626 while(channel->aio_send) {
3628 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3629 aio_abort(mesh, channel, &channel->aio_send);
3633 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3634 meshlink_aio_buffer_t *aio = channel->aio_send;
3635 size_t todo = aio->len - aio->done;
3643 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3646 ssize_t result = read(aio->fd, buf, todo);
3650 sent = utcp_send(connection, buf, todo);
3652 /* Reading from fd failed, cancel just this AIO buffer. */
3654 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3657 channel->aio_send = aio->next;
3658 aio_signal(mesh, channel, aio);
3660 aio = channel->aio_send;
3665 if(sent != (ssize_t)todo) {
3666 /* We should never get a partial send at this point */
3669 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3670 aio_abort(mesh, channel, &channel->aio_send);
3678 /* If we didn't finish this buffer, exit early. */
3679 if(aio->done < aio->len) {
3683 /* Signal completion of this buffer, and go to the next one. */
3684 channel->aio_send = aio->next;
3685 aio_signal(mesh, channel, aio);
3693 if(channel->poll_cb) {
3694 channel->poll_cb(mesh, channel, len);
3696 utcp_set_poll_cb(connection, NULL);
3700 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3701 if(!mesh || !channel) {
3702 meshlink_errno = MESHLINK_EINVAL;
3706 pthread_mutex_lock(&mesh->mutex);
3707 channel->poll_cb = cb;
3708 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3709 pthread_mutex_unlock(&mesh->mutex);
3712 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3714 meshlink_errno = MESHLINK_EINVAL;
3718 pthread_mutex_lock(&mesh->mutex);
3719 mesh->channel_accept_cb = cb;
3720 mesh->receive_cb = channel_receive;
3722 for splay_each(node_t, n, mesh->nodes) {
3723 if(!n->utcp && n != mesh->self) {
3724 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3725 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3726 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3730 pthread_mutex_unlock(&mesh->mutex);
3733 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3737 meshlink_errno = MESHLINK_EINVAL;
3741 pthread_mutex_lock(&mesh->mutex);
3742 utcp_set_sndbuf(channel->c, size);
3743 pthread_mutex_unlock(&mesh->mutex);
3746 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3750 meshlink_errno = MESHLINK_EINVAL;
3754 pthread_mutex_lock(&mesh->mutex);
3755 utcp_set_rcvbuf(channel->c, size);
3756 pthread_mutex_unlock(&mesh->mutex);
3759 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) {
3761 abort(); // TODO: handle non-NULL data
3764 if(!mesh || !node) {
3765 meshlink_errno = MESHLINK_EINVAL;
3769 pthread_mutex_lock(&mesh->mutex);
3771 node_t *n = (node_t *)node;
3774 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3775 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3776 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3777 mesh->receive_cb = channel_receive;
3780 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3781 pthread_mutex_unlock(&mesh->mutex);
3786 if(n->status.blacklisted) {
3787 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3788 meshlink_errno = MESHLINK_EBLACKLISTED;
3789 pthread_mutex_unlock(&mesh->mutex);
3793 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3795 channel->receive_cb = cb;
3798 channel->priv = (void *)data;
3801 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3803 pthread_mutex_unlock(&mesh->mutex);
3806 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3814 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) {
3815 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3818 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3819 if(!mesh || !channel) {
3820 meshlink_errno = MESHLINK_EINVAL;
3824 pthread_mutex_lock(&mesh->mutex);
3825 utcp_shutdown(channel->c, direction);
3826 pthread_mutex_unlock(&mesh->mutex);
3829 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3830 if(!mesh || !channel) {
3831 meshlink_errno = MESHLINK_EINVAL;
3835 pthread_mutex_lock(&mesh->mutex);
3837 utcp_close(channel->c);
3839 /* Clean up any outstanding AIO buffers. */
3840 aio_abort(mesh, channel, &channel->aio_send);
3841 aio_abort(mesh, channel, &channel->aio_receive);
3843 pthread_mutex_unlock(&mesh->mutex);
3848 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3849 if(!mesh || !channel) {
3850 meshlink_errno = MESHLINK_EINVAL;
3859 meshlink_errno = MESHLINK_EINVAL;
3863 // TODO: more finegrained locking.
3864 // Ideally we want to put the data into the UTCP connection's send buffer.
3865 // Then, preferably only if there is room in the receiver window,
3866 // kick the meshlink thread to go send packets.
3870 pthread_mutex_lock(&mesh->mutex);
3872 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3873 if(channel->aio_send) {
3876 retval = utcp_send(channel->c, data, len);
3879 pthread_mutex_unlock(&mesh->mutex);
3882 meshlink_errno = MESHLINK_ENETWORK;
3888 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) {
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_send;
3916 /* Ensure the poll callback is set, and call it right now to push data if possible */
3917 utcp_set_poll_cb(channel->c, channel_poll);
3918 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
3921 channel_poll(channel->c, todo);
3924 pthread_mutex_unlock(&mesh->mutex);
3929 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) {
3930 if(!mesh || !channel) {
3931 meshlink_errno = MESHLINK_EINVAL;
3935 if(!len || fd == -1) {
3936 meshlink_errno = MESHLINK_EINVAL;
3940 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3946 pthread_mutex_lock(&mesh->mutex);
3948 /* Append the AIO buffer descriptor to the end of the chain */
3949 meshlink_aio_buffer_t **p = &channel->aio_send;
3957 /* Ensure the poll callback is set, and call it right now to push data if possible */
3958 utcp_set_poll_cb(channel->c, channel_poll);
3959 size_t left = utcp_get_rcvbuf_free(channel->c);
3962 channel_poll(channel->c, left);
3965 pthread_mutex_unlock(&mesh->mutex);
3970 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) {
3971 if(!mesh || !channel) {
3972 meshlink_errno = MESHLINK_EINVAL;
3977 meshlink_errno = MESHLINK_EINVAL;
3981 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3984 aio->cb.buffer = cb;
3987 pthread_mutex_lock(&mesh->mutex);
3989 /* Append the AIO buffer descriptor to the end of the chain */
3990 meshlink_aio_buffer_t **p = &channel->aio_receive;
3998 pthread_mutex_unlock(&mesh->mutex);
4003 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) {
4004 if(!mesh || !channel) {
4005 meshlink_errno = MESHLINK_EINVAL;
4009 if(!len || fd == -1) {
4010 meshlink_errno = MESHLINK_EINVAL;
4014 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4020 pthread_mutex_lock(&mesh->mutex);
4022 /* Append the AIO buffer descriptor to the end of the chain */
4023 meshlink_aio_buffer_t **p = &channel->aio_receive;
4031 pthread_mutex_unlock(&mesh->mutex);
4036 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4037 if(!mesh || !channel) {
4038 meshlink_errno = MESHLINK_EINVAL;
4042 return channel->c->flags;
4045 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4046 if(!mesh || !channel) {
4047 meshlink_errno = MESHLINK_EINVAL;
4051 return utcp_get_sendq(channel->c);
4054 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4055 if(!mesh || !channel) {
4056 meshlink_errno = MESHLINK_EINVAL;
4060 return utcp_get_recvq(channel->c);
4063 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4064 if(!mesh || !channel) {
4065 meshlink_errno = MESHLINK_EINVAL;
4069 return utcp_get_mss(channel->node->utcp);
4072 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4073 if(!mesh || !node) {
4074 meshlink_errno = MESHLINK_EINVAL;
4078 node_t *n = (node_t *)node;
4080 pthread_mutex_lock(&mesh->mutex);
4083 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4084 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4085 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4088 utcp_set_user_timeout(n->utcp, timeout);
4090 pthread_mutex_unlock(&mesh->mutex);
4093 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4094 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4095 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4096 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4097 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4100 if(mesh->node_status_cb) {
4101 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4104 if(mesh->node_pmtu_cb) {
4105 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4109 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4110 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4112 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4113 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4117 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4118 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4122 n->status.duplicate = true;
4123 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4126 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4130 meshlink_errno = MESHLINK_EINVAL;
4134 pthread_mutex_lock(&mesh->mutex);
4136 if(mesh->discovery == enable) {
4140 if(mesh->threadstarted) {
4142 discovery_start(mesh);
4144 discovery_stop(mesh);
4148 mesh->discovery = enable;
4151 pthread_mutex_unlock(&mesh->mutex);
4155 meshlink_errno = MESHLINK_ENOTSUP;
4159 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4160 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4161 meshlink_errno = EINVAL;
4165 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4166 meshlink_errno = EINVAL;
4170 pthread_mutex_lock(&mesh->mutex);
4171 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4172 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4173 pthread_mutex_unlock(&mesh->mutex);
4176 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4177 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4178 meshlink_errno = EINVAL;
4182 if(fast_retry_period < 0) {
4183 meshlink_errno = EINVAL;
4187 pthread_mutex_lock(&mesh->mutex);
4188 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4189 pthread_mutex_unlock(&mesh->mutex);
4192 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4194 meshlink_errno = EINVAL;
4198 pthread_mutex_lock(&mesh->mutex);
4199 mesh->inviter_commits_first = inviter_commits_first;
4200 pthread_mutex_unlock(&mesh->mutex);
4203 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4205 meshlink_errno = EINVAL;
4209 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4210 meshlink_errno = EINVAL;
4214 pthread_mutex_lock(&mesh->mutex);
4215 free(mesh->external_address_url);
4216 mesh->external_address_url = url ? xstrdup(url) : NULL;
4217 pthread_mutex_unlock(&mesh->mutex);
4220 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4221 if(!mesh || granularity < 0) {
4222 meshlink_errno = EINVAL;
4226 utcp_set_clock_granularity(granularity);
4229 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4232 if(!mesh->connections || !mesh->loop.running) {
4239 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
4240 // We should only call the callback function if we are in the background thread.
4241 if(!mesh->error_cb) {
4245 if(!mesh->threadstarted) {
4249 if(mesh->thread == pthread_self()) {
4250 mesh->error_cb(mesh, meshlink_errno);
4254 static void __attribute__((constructor)) meshlink_init(void) {
4256 utcp_set_clock_granularity(10000);
4259 static void __attribute__((destructor)) meshlink_exit(void) {