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 char *hostname[4] = {NULL};
425 char *port[4] = {NULL};
426 char *hostport = NULL;
428 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
429 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
432 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
433 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
436 // Add local addresses if requested
437 if(flags & MESHLINK_INVITE_LOCAL) {
438 if(flags & MESHLINK_INVITE_IPV4) {
439 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
442 if(flags & MESHLINK_INVITE_IPV6) {
443 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
447 // Add public/canonical addresses if requested
448 if(flags & MESHLINK_INVITE_PUBLIC) {
449 // Try the CanonicalAddress first
450 get_canonical_address(mesh->self, &hostname[2], &port[2]);
453 if(flags & MESHLINK_INVITE_IPV4) {
454 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
457 if(flags & MESHLINK_INVITE_IPV6) {
458 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
463 for(int i = 0; i < 4; i++) {
464 // Ensure we always have a port number
465 if(hostname[i] && !port[i]) {
466 port[i] = xstrdup(mesh->myport);
470 remove_duplicate_hostnames(hostname, port, 4);
472 // Resolve the hostnames
473 for(int i = 0; i < 4; i++) {
478 // Convert what we have to a sockaddr
479 struct addrinfo *ai_in, *ai_out;
480 struct addrinfo hint = {
481 .ai_family = AF_UNSPEC,
482 .ai_flags = AI_NUMERICSERV,
483 .ai_socktype = SOCK_STREAM,
485 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
491 // Remember the address
492 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)ai_in->ai_addr);
494 if(flags & MESHLINK_INVITE_NUMERIC) {
495 // We don't need to do any further conversion
500 // Convert it to a hostname
501 char resolved_host[NI_MAXHOST];
502 char resolved_port[NI_MAXSERV];
503 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
505 if(err || !is_valid_hostname(resolved_host)) {
510 // Convert the hostname back to a sockaddr
511 hint.ai_family = ai_in->ai_family;
512 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
519 // Check if it's still the same sockaddr
520 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
522 freeaddrinfo(ai_out);
526 // Yes: replace the hostname with the resolved one
528 hostname[i] = xstrdup(resolved_host);
531 freeaddrinfo(ai_out);
534 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
535 remove_duplicate_hostnames(hostname, port, 4);
537 // Concatenate all unique address to the hostport string
538 for(int i = 0; i < 4; i++) {
543 // Append the address to the hostport string
545 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
547 hostport = newhostport;
556 static bool try_bind(int port) {
557 struct addrinfo *ai = NULL;
558 struct addrinfo hint = {
559 .ai_flags = AI_PASSIVE,
560 .ai_family = AF_UNSPEC,
561 .ai_socktype = SOCK_STREAM,
562 .ai_protocol = IPPROTO_TCP,
566 snprintf(portstr, sizeof(portstr), "%d", port);
568 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
572 bool success = false;
574 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
575 /* Try to bind to TCP. */
577 int tcp_fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
583 int result = bind(tcp_fd, aip->ai_addr, aip->ai_addrlen);
587 if(errno == EADDRINUSE) {
588 /* If this port is in use for any address family, avoid it. */
596 /* If TCP worked, then we require that UDP works as well. */
598 int udp_fd = socket(aip->ai_family, SOCK_DGRAM, IPPROTO_UDP);
605 result = bind(udp_fd, aip->ai_addr, aip->ai_addrlen);
620 static int check_port(meshlink_handle_t *mesh) {
621 for(int i = 0; i < 1000; i++) {
622 int port = 0x1000 + prng(mesh, 0x8000);
626 xasprintf(&mesh->myport, "%d", port);
631 meshlink_errno = MESHLINK_ENETWORK;
632 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
636 static bool write_main_config_files(meshlink_handle_t *mesh) {
637 if(!mesh->confbase) {
643 /* Write the main config file */
644 packmsg_output_t out = {buf, sizeof buf};
646 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
647 packmsg_add_str(&out, mesh->name);
648 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
649 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
650 packmsg_add_uint16(&out, atoi(mesh->myport));
652 if(!packmsg_output_ok(&out)) {
656 config_t config = {buf, packmsg_output_size(&out, buf)};
658 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
662 /* Write our own host config file */
663 if(!node_write_config(mesh, mesh->self)) {
671 meshlink_handle_t *mesh;
673 char cookie[18 + 32];
684 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
685 meshlink_handle_t *mesh = state->mesh;
686 packmsg_input_t in = {buf, len};
687 uint32_t version = packmsg_get_uint32(&in);
689 if(version != MESHLINK_INVITATION_VERSION) {
690 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
694 char *name = packmsg_get_str_dup(&in);
695 packmsg_skip_element(&in); /* submesh */
696 dev_class_t devclass = packmsg_get_int32(&in);
697 uint32_t count = packmsg_get_array(&in);
700 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
704 if(!check_id(name)) {
705 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
711 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
717 free(mesh->self->name);
719 mesh->self->name = xstrdup(name);
720 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
722 // Initialize configuration directory
723 if(!config_init(mesh, "current")) {
727 if(!write_main_config_files(mesh)) {
731 // Write host config files
732 for(uint32_t i = 0; i < count; i++) {
734 uint32_t len = packmsg_get_bin_raw(&in, &data);
737 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
741 packmsg_input_t in2 = {data, len};
742 uint32_t version = packmsg_get_uint32(&in2);
743 char *name = packmsg_get_str_dup(&in2);
745 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
747 packmsg_input_invalidate(&in);
751 if(!check_id(name)) {
756 if(!strcmp(name, mesh->name)) {
757 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
759 meshlink_errno = MESHLINK_EPEER;
763 node_t *n = new_node();
766 config_t config = {data, len};
768 if(!node_read_from_config(mesh, n, &config)) {
770 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
771 meshlink_errno = MESHLINK_EPEER;
776 /* The first host config file is of the inviter itself;
777 * remember the address we are currently using for the invitation connection.
780 socklen_t salen = sizeof(sa);
782 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
783 node_add_recent_address(mesh, n, &sa);
787 /* Clear the reachability times, since we ourself have never seen these nodes yet */
788 n->last_reachable = 0;
789 n->last_unreachable = 0;
791 if(!node_write_config(mesh, n)) {
799 /* Ensure the configuration directory metadata is on disk */
800 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
804 if(!mesh->inviter_commits_first) {
805 devtool_set_inviter_commits_first(false);
808 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
810 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
815 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
817 join_state_t *state = handle;
818 const char *ptr = data;
821 int result = send(state->sock, ptr, len, 0);
823 if(result == -1 && errno == EINTR) {
825 } else if(result <= 0) {
836 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
837 join_state_t *state = handle;
838 meshlink_handle_t *mesh = state->mesh;
840 if(mesh->inviter_commits_first) {
842 case SPTPS_HANDSHAKE:
843 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
849 if(!finalize_join(state, msg, len)) {
853 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
854 shutdown(state->sock, SHUT_RDWR);
855 state->success = true;
863 case SPTPS_HANDSHAKE:
864 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
867 return finalize_join(state, msg, len);
870 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
871 shutdown(state->sock, SHUT_RDWR);
872 state->success = true;
883 static bool recvline(join_state_t *state) {
884 char *newline = NULL;
886 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
887 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
889 if(result == -1 && errno == EINTR) {
891 } else if(result <= 0) {
895 state->blen += result;
898 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
902 size_t len = newline - state->buffer;
904 memcpy(state->line, state->buffer, len);
905 state->line[len] = 0;
906 memmove(state->buffer, newline + 1, state->blen - len - 1);
907 state->blen -= len + 1;
912 static bool sendline(int fd, char *format, ...) {
918 va_start(ap, format);
919 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
922 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
930 int result = send(fd, p, blen, MSG_NOSIGNAL);
932 if(result == -1 && errno == EINTR) {
934 } else if(result <= 0) {
945 static const char *errstr[] = {
946 [MESHLINK_OK] = "No error",
947 [MESHLINK_EINVAL] = "Invalid argument",
948 [MESHLINK_ENOMEM] = "Out of memory",
949 [MESHLINK_ENOENT] = "No such node",
950 [MESHLINK_EEXIST] = "Node already exists",
951 [MESHLINK_EINTERNAL] = "Internal error",
952 [MESHLINK_ERESOLV] = "Could not resolve hostname",
953 [MESHLINK_ESTORAGE] = "Storage error",
954 [MESHLINK_ENETWORK] = "Network error",
955 [MESHLINK_EPEER] = "Error communicating with peer",
956 [MESHLINK_ENOTSUP] = "Operation not supported",
957 [MESHLINK_EBUSY] = "MeshLink instance already in use",
958 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
961 const char *meshlink_strerror(meshlink_errno_t err) {
962 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
963 return "Invalid error code";
969 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
970 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
972 mesh->private_key = ecdsa_generate();
973 mesh->invitation_key = ecdsa_generate();
975 if(!mesh->private_key || !mesh->invitation_key) {
976 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
977 meshlink_errno = MESHLINK_EINTERNAL;
981 logger(mesh, MESHLINK_DEBUG, "Done.\n");
986 static struct timeval idle(event_loop_t *loop, void *data) {
988 meshlink_handle_t *mesh = data;
989 struct timeval t, tmin = {3600, 0};
991 for splay_each(node_t, n, mesh->nodes) {
996 t = utcp_timeout(n->utcp);
998 if(timercmp(&t, &tmin, <)) {
1006 // Get our local address(es) by simulating connecting to an Internet host.
1007 static void add_local_addresses(meshlink_handle_t *mesh) {
1009 sa.storage.ss_family = AF_UNKNOWN;
1010 socklen_t salen = sizeof(sa);
1014 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1015 sa.in.sin_port = ntohs(atoi(mesh->myport));
1016 node_add_recent_address(mesh, mesh->self, &sa);
1023 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1024 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1025 node_add_recent_address(mesh, mesh->self, &sa);
1029 static bool meshlink_setup(meshlink_handle_t *mesh) {
1030 if(!config_destroy(mesh->confbase, "new")) {
1031 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1032 meshlink_errno = MESHLINK_ESTORAGE;
1036 if(!config_destroy(mesh->confbase, "old")) {
1037 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1038 meshlink_errno = MESHLINK_ESTORAGE;
1042 if(!config_init(mesh, "current")) {
1043 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1044 meshlink_errno = MESHLINK_ESTORAGE;
1048 if(!ecdsa_keygen(mesh)) {
1049 meshlink_errno = MESHLINK_EINTERNAL;
1053 if(check_port(mesh) == 0) {
1054 meshlink_errno = MESHLINK_ENETWORK;
1058 /* Create a node for ourself */
1060 mesh->self = new_node();
1061 mesh->self->name = xstrdup(mesh->name);
1062 mesh->self->devclass = mesh->devclass;
1063 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1064 mesh->self->session_id = mesh->session_id;
1066 if(!write_main_config_files(mesh)) {
1067 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1068 meshlink_errno = MESHLINK_ESTORAGE;
1072 /* Ensure the configuration directory metadata is on disk */
1073 if(!config_sync(mesh, "current")) {
1080 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1083 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1084 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1088 packmsg_input_t in = {config.buf, config.len};
1089 const void *private_key;
1090 const void *invitation_key;
1092 uint32_t version = packmsg_get_uint32(&in);
1093 char *name = packmsg_get_str_dup(&in);
1094 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1095 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1096 uint16_t myport = packmsg_get_uint16(&in);
1098 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1099 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1101 config_free(&config);
1107 // TODO: check this?
1108 if(mesh->name && strcmp(mesh->name, name)) {
1109 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1110 meshlink_errno = MESHLINK_ESTORAGE;
1112 config_free(&config);
1120 xasprintf(&mesh->myport, "%u", myport);
1121 mesh->private_key = ecdsa_set_private_key(private_key);
1122 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1123 config_free(&config);
1125 /* Create a node for ourself and read our host configuration file */
1127 mesh->self = new_node();
1128 mesh->self->name = xstrdup(name);
1129 mesh->self->devclass = mesh->devclass;
1130 mesh->self->session_id = mesh->session_id;
1132 if(!node_read_public_key(mesh, mesh->self)) {
1133 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1134 meshlink_errno = MESHLINK_ESTORAGE;
1135 free_node(mesh->self);
1144 static void *setup_network_in_netns_thread(void *arg) {
1145 meshlink_handle_t *mesh = arg;
1147 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1151 bool success = setup_network(mesh);
1152 add_local_addresses(mesh);
1153 return success ? arg : NULL;
1155 #endif // HAVE_SETNS
1157 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1158 if(!confbase || !*confbase) {
1159 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1160 meshlink_errno = MESHLINK_EINVAL;
1164 if(!appname || !*appname) {
1165 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1166 meshlink_errno = MESHLINK_EINVAL;
1170 if(strchr(appname, ' ')) {
1171 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1172 meshlink_errno = MESHLINK_EINVAL;
1176 if(!name || !*name) {
1177 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1178 meshlink_errno = MESHLINK_EINVAL;
1182 if(!check_id(name)) {
1183 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1184 meshlink_errno = MESHLINK_EINVAL;
1188 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1189 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1190 meshlink_errno = MESHLINK_EINVAL;
1194 meshlink_open_params_t *params = xzalloc(sizeof * params);
1196 params->confbase = xstrdup(confbase);
1197 params->name = xstrdup(name);
1198 params->appname = xstrdup(appname);
1199 params->devclass = devclass;
1205 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1207 meshlink_errno = MESHLINK_EINVAL;
1211 params->netns = netns;
1216 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1218 meshlink_errno = MESHLINK_EINVAL;
1222 if((!key && keylen) || (key && !keylen)) {
1223 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1224 meshlink_errno = MESHLINK_EINVAL;
1229 params->keylen = keylen;
1234 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1235 if(!mesh || !new_key || !new_keylen) {
1236 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1237 meshlink_errno = MESHLINK_EINVAL;
1241 pthread_mutex_lock(&mesh->mutex);
1243 // Create hash for the new key
1244 void *new_config_key;
1245 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1247 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1248 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1249 meshlink_errno = MESHLINK_EINTERNAL;
1250 pthread_mutex_unlock(&mesh->mutex);
1254 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1256 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1257 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1258 meshlink_errno = MESHLINK_ESTORAGE;
1259 pthread_mutex_unlock(&mesh->mutex);
1263 devtool_keyrotate_probe(1);
1265 // Rename confbase/current/ to confbase/old
1267 if(!config_rename(mesh, "current", "old")) {
1268 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1269 meshlink_errno = MESHLINK_ESTORAGE;
1270 pthread_mutex_unlock(&mesh->mutex);
1274 devtool_keyrotate_probe(2);
1276 // Rename confbase/new/ to confbase/current
1278 if(!config_rename(mesh, "new", "current")) {
1279 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1280 meshlink_errno = MESHLINK_ESTORAGE;
1281 pthread_mutex_unlock(&mesh->mutex);
1285 devtool_keyrotate_probe(3);
1287 // Cleanup the "old" confbase sub-directory
1289 if(!config_destroy(mesh->confbase, "old")) {
1290 pthread_mutex_unlock(&mesh->mutex);
1294 // Change the mesh handle key with new key
1296 free(mesh->config_key);
1297 mesh->config_key = new_config_key;
1299 pthread_mutex_unlock(&mesh->mutex);
1304 void meshlink_open_params_free(meshlink_open_params_t *params) {
1306 meshlink_errno = MESHLINK_EINVAL;
1310 free(params->confbase);
1312 free(params->appname);
1317 /// Device class traits
1318 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1319 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1320 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1321 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1322 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1325 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1326 if(!confbase || !*confbase) {
1327 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1328 meshlink_errno = MESHLINK_EINVAL;
1332 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1333 meshlink_open_params_t params;
1334 memset(¶ms, 0, sizeof(params));
1336 params.confbase = (char *)confbase;
1337 params.name = (char *)name;
1338 params.appname = (char *)appname;
1339 params.devclass = devclass;
1342 return meshlink_open_ex(¶ms);
1345 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) {
1346 if(!confbase || !*confbase) {
1347 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1348 meshlink_errno = MESHLINK_EINVAL;
1352 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1353 meshlink_open_params_t params;
1354 memset(¶ms, 0, sizeof(params));
1356 params.confbase = (char *)confbase;
1357 params.name = (char *)name;
1358 params.appname = (char *)appname;
1359 params.devclass = devclass;
1362 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1366 return meshlink_open_ex(¶ms);
1369 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1370 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1371 meshlink_open_params_t params;
1372 memset(¶ms, 0, sizeof(params));
1374 params.name = (char *)name;
1375 params.appname = (char *)appname;
1376 params.devclass = devclass;
1379 return meshlink_open_ex(¶ms);
1382 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1383 // Validate arguments provided by the application
1384 bool usingname = false;
1386 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1388 if(!params->appname || !*params->appname) {
1389 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1390 meshlink_errno = MESHLINK_EINVAL;
1394 if(strchr(params->appname, ' ')) {
1395 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1396 meshlink_errno = MESHLINK_EINVAL;
1400 if(!params->name || !*params->name) {
1401 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1403 } else { //check name only if there is a name != NULL
1405 if(!check_id(params->name)) {
1406 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1407 meshlink_errno = MESHLINK_EINVAL;
1414 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1415 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1416 meshlink_errno = MESHLINK_EINVAL;
1420 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1421 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1422 meshlink_errno = MESHLINK_EINVAL;
1426 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1428 if(params->confbase) {
1429 mesh->confbase = xstrdup(params->confbase);
1432 mesh->appname = xstrdup(params->appname);
1433 mesh->devclass = params->devclass;
1434 mesh->discovery = true;
1435 mesh->invitation_timeout = 604800; // 1 week
1436 mesh->netns = params->netns;
1437 mesh->submeshes = NULL;
1438 mesh->log_cb = global_log_cb;
1439 mesh->log_level = global_log_level;
1441 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1444 randomize(&mesh->session_id, sizeof(mesh->session_id));
1445 } while(mesh->session_id == 0);
1447 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1450 mesh->name = xstrdup(params->name);
1455 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1457 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1458 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1459 meshlink_close(mesh);
1460 meshlink_errno = MESHLINK_EINTERNAL;
1466 pthread_mutexattr_t attr;
1467 pthread_mutexattr_init(&attr);
1468 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1469 pthread_mutex_init(&mesh->mutex, &attr);
1471 mesh->threadstarted = false;
1472 event_loop_init(&mesh->loop);
1473 mesh->loop.data = mesh;
1475 meshlink_queue_init(&mesh->outpacketqueue);
1477 // Atomically lock the configuration directory.
1478 if(!main_config_lock(mesh)) {
1479 meshlink_close(mesh);
1483 // If no configuration exists yet, create it.
1485 if(!meshlink_confbase_exists(mesh)) {
1486 if(!meshlink_setup(mesh)) {
1487 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1488 meshlink_close(mesh);
1492 if(!meshlink_read_config(mesh)) {
1493 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1494 meshlink_close(mesh);
1500 struct WSAData wsa_state;
1501 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1504 // Setup up everything
1505 // TODO: we should not open listening sockets yet
1507 bool success = false;
1509 if(mesh->netns != -1) {
1513 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1514 void *retval = NULL;
1515 success = pthread_join(thr, &retval) == 0 && retval;
1519 meshlink_errno = MESHLINK_EINTERNAL;
1522 #endif // HAVE_SETNS
1524 success = setup_network(mesh);
1525 add_local_addresses(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);
1657 // Start the main thread
1659 event_loop_start(&mesh->loop);
1661 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1662 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1663 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1664 meshlink_errno = MESHLINK_EINTERNAL;
1665 event_loop_stop(&mesh->loop);
1666 pthread_mutex_unlock(&mesh->mutex);
1670 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1671 mesh->threadstarted = true;
1673 // Ensure we are considered reachable
1676 pthread_mutex_unlock(&mesh->mutex);
1680 void meshlink_stop(meshlink_handle_t *mesh) {
1682 meshlink_errno = MESHLINK_EINVAL;
1686 pthread_mutex_lock(&mesh->mutex);
1687 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1689 // Shut down the main thread
1690 event_loop_stop(&mesh->loop);
1692 // Send ourselves a UDP packet to kick the event loop
1693 for(int i = 0; i < mesh->listen_sockets; i++) {
1695 socklen_t salen = sizeof(sa);
1697 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1698 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1702 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1703 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1707 if(mesh->threadstarted) {
1708 // Wait for the main thread to finish
1709 pthread_mutex_unlock(&mesh->mutex);
1710 pthread_join(mesh->thread, NULL);
1711 pthread_mutex_lock(&mesh->mutex);
1713 mesh->threadstarted = false;
1716 // Close all metaconnections
1717 if(mesh->connections) {
1718 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1720 connection_t *c = node->data;
1722 terminate_connection(mesh, c, false);
1726 exit_outgoings(mesh);
1728 // Ensure we are considered unreachable
1733 // Try to write out any changed node config files, ignore errors at this point.
1735 for splay_each(node_t, n, mesh->nodes) {
1736 if(n->status.dirty) {
1737 n->status.dirty = !node_write_config(mesh, n);
1742 pthread_mutex_unlock(&mesh->mutex);
1745 void meshlink_close(meshlink_handle_t *mesh) {
1747 meshlink_errno = MESHLINK_EINVAL;
1751 // stop can be called even if mesh has not been started
1752 meshlink_stop(mesh);
1754 // lock is not released after this
1755 pthread_mutex_lock(&mesh->mutex);
1757 // Close and free all resources used.
1759 close_network_connections(mesh);
1761 logger(mesh, MESHLINK_INFO, "Terminating");
1763 event_loop_exit(&mesh->loop);
1767 if(mesh->confbase) {
1773 ecdsa_free(mesh->invitation_key);
1775 if(mesh->netns != -1) {
1779 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1783 meshlink_queue_exit(&mesh->outpacketqueue);
1786 free(mesh->appname);
1787 free(mesh->confbase);
1788 free(mesh->config_key);
1789 free(mesh->external_address_url);
1790 ecdsa_free(mesh->private_key);
1792 main_config_unlock(mesh);
1794 pthread_mutex_unlock(&mesh->mutex);
1795 pthread_mutex_destroy(&mesh->mutex);
1797 memset(mesh, 0, sizeof(*mesh));
1802 bool meshlink_destroy(const char *confbase) {
1804 meshlink_errno = MESHLINK_EINVAL;
1808 /* Exit early if the confbase directory itself doesn't exist */
1809 if(access(confbase, F_OK) && errno == ENOENT) {
1813 /* Take the lock the same way meshlink_open() would. */
1814 char lockfilename[PATH_MAX];
1815 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1817 FILE *lockfile = fopen(lockfilename, "w+");
1820 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1821 meshlink_errno = MESHLINK_ESTORAGE;
1826 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1830 // TODO: use _locking()?
1833 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1834 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1836 meshlink_errno = MESHLINK_EBUSY;
1842 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1843 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1847 if(unlink(lockfilename)) {
1848 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1850 meshlink_errno = MESHLINK_ESTORAGE;
1856 if(!sync_path(confbase)) {
1857 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1858 meshlink_errno = MESHLINK_ESTORAGE;
1865 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1867 meshlink_errno = MESHLINK_EINVAL;
1871 pthread_mutex_lock(&mesh->mutex);
1872 mesh->receive_cb = cb;
1873 pthread_mutex_unlock(&mesh->mutex);
1876 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1878 meshlink_errno = MESHLINK_EINVAL;
1882 pthread_mutex_lock(&mesh->mutex);
1883 mesh->connection_try_cb = cb;
1884 pthread_mutex_unlock(&mesh->mutex);
1887 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1889 meshlink_errno = MESHLINK_EINVAL;
1893 pthread_mutex_lock(&mesh->mutex);
1894 mesh->node_status_cb = cb;
1895 pthread_mutex_unlock(&mesh->mutex);
1898 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1900 meshlink_errno = MESHLINK_EINVAL;
1904 pthread_mutex_lock(&mesh->mutex);
1905 mesh->node_pmtu_cb = cb;
1906 pthread_mutex_unlock(&mesh->mutex);
1909 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1911 meshlink_errno = MESHLINK_EINVAL;
1915 pthread_mutex_lock(&mesh->mutex);
1916 mesh->node_duplicate_cb = cb;
1917 pthread_mutex_unlock(&mesh->mutex);
1920 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1922 pthread_mutex_lock(&mesh->mutex);
1924 mesh->log_level = cb ? level : 0;
1925 pthread_mutex_unlock(&mesh->mutex);
1928 global_log_level = cb ? level : 0;
1932 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1934 meshlink_errno = MESHLINK_EINVAL;
1938 pthread_mutex_lock(&mesh->mutex);
1939 mesh->error_cb = cb;
1940 pthread_mutex_unlock(&mesh->mutex);
1943 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1944 meshlink_packethdr_t *hdr;
1946 // Validate arguments
1947 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1948 meshlink_errno = MESHLINK_EINVAL;
1957 meshlink_errno = MESHLINK_EINVAL;
1961 node_t *n = (node_t *)destination;
1963 if(n->status.blacklisted) {
1964 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1965 meshlink_errno = MESHLINK_EBLACKLISTED;
1969 // Prepare the packet
1970 vpn_packet_t *packet = malloc(sizeof(*packet));
1973 meshlink_errno = MESHLINK_ENOMEM;
1977 packet->probe = false;
1978 packet->tcp = false;
1979 packet->len = len + sizeof(*hdr);
1981 hdr = (meshlink_packethdr_t *)packet->data;
1982 memset(hdr, 0, sizeof(*hdr));
1983 // leave the last byte as 0 to make sure strings are always
1984 // null-terminated if they are longer than the buffer
1985 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1986 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1988 memcpy(packet->data + sizeof(*hdr), data, len);
1991 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1993 meshlink_errno = MESHLINK_ENOMEM;
1997 // Notify event loop
1998 signal_trigger(&mesh->loop, &mesh->datafromapp);
2003 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2005 meshlink_handle_t *mesh = data;
2006 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
2012 mesh->self->in_packets++;
2013 mesh->self->in_bytes += packet->len;
2014 route(mesh, mesh->self, packet);
2019 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2020 if(!mesh || !destination) {
2021 meshlink_errno = MESHLINK_EINVAL;
2025 pthread_mutex_lock(&mesh->mutex);
2027 node_t *n = (node_t *)destination;
2029 if(!n->status.reachable) {
2030 pthread_mutex_unlock(&mesh->mutex);
2033 } else if(n->mtuprobes > 30 && n->minmtu) {
2034 pthread_mutex_unlock(&mesh->mutex);
2037 pthread_mutex_unlock(&mesh->mutex);
2042 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2043 if(!mesh || !node) {
2044 meshlink_errno = MESHLINK_EINVAL;
2048 pthread_mutex_lock(&mesh->mutex);
2050 node_t *n = (node_t *)node;
2052 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2053 meshlink_errno = MESHLINK_EINTERNAL;
2054 pthread_mutex_unlock(&mesh->mutex);
2058 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2061 meshlink_errno = MESHLINK_EINTERNAL;
2064 pthread_mutex_unlock(&mesh->mutex);
2068 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2070 meshlink_errno = MESHLINK_EINVAL;
2074 return (meshlink_node_t *)mesh->self;
2077 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2078 if(!mesh || !name) {
2079 meshlink_errno = MESHLINK_EINVAL;
2085 pthread_mutex_lock(&mesh->mutex);
2086 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2087 pthread_mutex_unlock(&mesh->mutex);
2090 meshlink_errno = MESHLINK_ENOENT;
2093 return (meshlink_node_t *)n;
2096 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2097 if(!mesh || !name) {
2098 meshlink_errno = MESHLINK_EINVAL;
2102 meshlink_submesh_t *submesh = NULL;
2104 pthread_mutex_lock(&mesh->mutex);
2105 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2106 pthread_mutex_unlock(&mesh->mutex);
2109 meshlink_errno = MESHLINK_ENOENT;
2115 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2116 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2117 meshlink_errno = MESHLINK_EINVAL;
2121 meshlink_node_t **result;
2124 pthread_mutex_lock(&mesh->mutex);
2126 *nmemb = mesh->nodes->count;
2127 result = realloc(nodes, *nmemb * sizeof(*nodes));
2130 meshlink_node_t **p = result;
2132 for splay_each(node_t, n, mesh->nodes) {
2133 *p++ = (meshlink_node_t *)n;
2138 meshlink_errno = MESHLINK_ENOMEM;
2141 pthread_mutex_unlock(&mesh->mutex);
2146 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) {
2147 meshlink_node_t **result;
2149 pthread_mutex_lock(&mesh->mutex);
2153 for splay_each(node_t, n, mesh->nodes) {
2154 if(search_node(n, condition)) {
2161 pthread_mutex_unlock(&mesh->mutex);
2165 result = realloc(nodes, *nmemb * sizeof(*nodes));
2168 meshlink_node_t **p = result;
2170 for splay_each(node_t, n, mesh->nodes) {
2171 if(search_node(n, condition)) {
2172 *p++ = (meshlink_node_t *)n;
2178 meshlink_errno = MESHLINK_ENOMEM;
2181 pthread_mutex_unlock(&mesh->mutex);
2186 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2187 dev_class_t *devclass = (dev_class_t *)condition;
2189 if(*devclass == (dev_class_t)node->devclass) {
2196 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2197 if(condition == node->submesh) {
2209 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2210 const struct time_range *range = condition;
2211 time_t start = node->last_reachable;
2212 time_t end = node->last_unreachable;
2222 if(range->end >= range->start) {
2223 return start <= range->end && end >= range->start;
2225 return start > range->start || end < range->end;
2229 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) {
2230 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2231 meshlink_errno = MESHLINK_EINVAL;
2235 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2238 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2239 if(!mesh || !submesh || !nmemb) {
2240 meshlink_errno = MESHLINK_EINVAL;
2244 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2247 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) {
2248 if(!mesh || !nmemb) {
2249 meshlink_errno = MESHLINK_EINVAL;
2253 struct time_range range = {start, end};
2255 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2258 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2259 if(!mesh || !node) {
2260 meshlink_errno = MESHLINK_EINVAL;
2264 dev_class_t devclass;
2266 pthread_mutex_lock(&mesh->mutex);
2268 devclass = ((node_t *)node)->devclass;
2270 pthread_mutex_unlock(&mesh->mutex);
2275 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2276 if(!mesh || !node) {
2277 meshlink_errno = MESHLINK_EINVAL;
2281 node_t *n = (node_t *)node;
2283 meshlink_submesh_t *s;
2285 s = (meshlink_submesh_t *)n->submesh;
2290 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2291 if(!mesh || !node) {
2292 meshlink_errno = MESHLINK_EINVAL;
2296 node_t *n = (node_t *)node;
2299 pthread_mutex_lock(&mesh->mutex);
2300 reachable = n->status.reachable && !n->status.blacklisted;
2302 if(last_reachable) {
2303 *last_reachable = n->last_reachable;
2306 if(last_unreachable) {
2307 *last_unreachable = n->last_unreachable;
2310 pthread_mutex_unlock(&mesh->mutex);
2315 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2316 if(!mesh || !data || !len || !signature || !siglen) {
2317 meshlink_errno = MESHLINK_EINVAL;
2321 if(*siglen < MESHLINK_SIGLEN) {
2322 meshlink_errno = MESHLINK_EINVAL;
2326 pthread_mutex_lock(&mesh->mutex);
2328 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2329 meshlink_errno = MESHLINK_EINTERNAL;
2330 pthread_mutex_unlock(&mesh->mutex);
2334 *siglen = MESHLINK_SIGLEN;
2335 pthread_mutex_unlock(&mesh->mutex);
2339 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2340 if(!mesh || !source || !data || !len || !signature) {
2341 meshlink_errno = MESHLINK_EINVAL;
2345 if(siglen != MESHLINK_SIGLEN) {
2346 meshlink_errno = MESHLINK_EINVAL;
2350 pthread_mutex_lock(&mesh->mutex);
2354 struct node_t *n = (struct node_t *)source;
2356 if(!node_read_public_key(mesh, n)) {
2357 meshlink_errno = MESHLINK_EINTERNAL;
2360 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2363 pthread_mutex_unlock(&mesh->mutex);
2367 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2368 pthread_mutex_lock(&mesh->mutex);
2370 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2373 // TODO: Update invitation key if necessary?
2376 pthread_mutex_unlock(&mesh->mutex);
2378 return mesh->invitation_key;
2381 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2382 if(!mesh || !node || !address) {
2383 meshlink_errno = MESHLINK_EINVAL;
2387 if(!is_valid_hostname(address)) {
2388 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2389 meshlink_errno = MESHLINK_EINVAL;
2393 if(port && !is_valid_port(port)) {
2394 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2395 meshlink_errno = MESHLINK_EINVAL;
2399 char *canonical_address;
2402 xasprintf(&canonical_address, "%s %s", address, port);
2404 canonical_address = xstrdup(address);
2407 pthread_mutex_lock(&mesh->mutex);
2409 node_t *n = (node_t *)node;
2410 free(n->canonical_address);
2411 n->canonical_address = canonical_address;
2413 if(!node_write_config(mesh, n)) {
2414 pthread_mutex_unlock(&mesh->mutex);
2418 pthread_mutex_unlock(&mesh->mutex);
2420 return config_sync(mesh, "current");
2423 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2424 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2427 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2429 meshlink_errno = MESHLINK_EINVAL;
2433 char *address = meshlink_get_external_address(mesh);
2439 bool rval = meshlink_add_address(mesh, address);
2445 int meshlink_get_port(meshlink_handle_t *mesh) {
2447 meshlink_errno = MESHLINK_EINVAL;
2452 meshlink_errno = MESHLINK_EINTERNAL;
2458 pthread_mutex_lock(&mesh->mutex);
2459 port = atoi(mesh->myport);
2460 pthread_mutex_unlock(&mesh->mutex);
2465 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2466 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2467 meshlink_errno = MESHLINK_EINVAL;
2471 if(mesh->myport && port == atoi(mesh->myport)) {
2475 if(!try_bind(port)) {
2476 meshlink_errno = MESHLINK_ENETWORK;
2480 devtool_trybind_probe();
2484 pthread_mutex_lock(&mesh->mutex);
2486 if(mesh->threadstarted) {
2487 meshlink_errno = MESHLINK_EINVAL;
2492 xasprintf(&mesh->myport, "%d", port);
2494 /* Close down the network. This also deletes mesh->self. */
2495 close_network_connections(mesh);
2497 /* Recreate mesh->self. */
2498 mesh->self = new_node();
2499 mesh->self->name = xstrdup(mesh->name);
2500 mesh->self->devclass = mesh->devclass;
2501 mesh->self->session_id = mesh->session_id;
2502 xasprintf(&mesh->myport, "%d", port);
2504 if(!node_read_public_key(mesh, mesh->self)) {
2505 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2506 meshlink_errno = MESHLINK_ESTORAGE;
2507 free_node(mesh->self);
2510 } else if(!setup_network(mesh)) {
2511 meshlink_errno = MESHLINK_ENETWORK;
2515 /* Rebuild our own list of recent addresses */
2516 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2517 add_local_addresses(mesh);
2519 /* Write meshlink.conf with the updated port number */
2520 write_main_config_files(mesh);
2522 rval = config_sync(mesh, "current");
2525 pthread_mutex_unlock(&mesh->mutex);
2527 return rval && meshlink_get_port(mesh) == port;
2530 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2531 mesh->invitation_timeout = timeout;
2534 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2535 meshlink_submesh_t *s = NULL;
2538 meshlink_errno = MESHLINK_EINVAL;
2543 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2546 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2547 meshlink_errno = MESHLINK_EINVAL;
2551 s = (meshlink_submesh_t *)mesh->self->submesh;
2554 pthread_mutex_lock(&mesh->mutex);
2556 // Check validity of the new node's name
2557 if(!check_id(name)) {
2558 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2559 meshlink_errno = MESHLINK_EINVAL;
2560 pthread_mutex_unlock(&mesh->mutex);
2564 // Ensure no host configuration file with that name exists
2565 if(config_exists(mesh, "current", name)) {
2566 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2567 meshlink_errno = MESHLINK_EEXIST;
2568 pthread_mutex_unlock(&mesh->mutex);
2572 // Ensure no other nodes know about this name
2573 if(lookup_node(mesh, name)) {
2574 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2575 meshlink_errno = MESHLINK_EEXIST;
2576 pthread_mutex_unlock(&mesh->mutex);
2580 // Get the local address
2581 char *address = get_my_hostname(mesh, flags);
2584 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2585 meshlink_errno = MESHLINK_ERESOLV;
2586 pthread_mutex_unlock(&mesh->mutex);
2590 if(!refresh_invitation_key(mesh)) {
2591 meshlink_errno = MESHLINK_EINTERNAL;
2592 pthread_mutex_unlock(&mesh->mutex);
2596 // If we changed our own host config file, write it out now
2597 if(mesh->self->status.dirty) {
2598 if(!node_write_config(mesh, mesh->self)) {
2599 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2600 pthread_mutex_unlock(&mesh->mutex);
2607 // Create a hash of the key.
2608 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2609 sha512(fingerprint, strlen(fingerprint), hash);
2610 b64encode_urlsafe(hash, hash, 18);
2612 // Create a random cookie for this invitation.
2614 randomize(cookie, 18);
2616 // Create a filename that doesn't reveal the cookie itself
2617 char buf[18 + strlen(fingerprint)];
2618 char cookiehash[64];
2619 memcpy(buf, cookie, 18);
2620 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2621 sha512(buf, sizeof(buf), cookiehash);
2622 b64encode_urlsafe(cookiehash, cookiehash, 18);
2624 b64encode_urlsafe(cookie, cookie, 18);
2628 /* Construct the invitation file */
2629 uint8_t outbuf[4096];
2630 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2632 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2633 packmsg_add_str(&inv, name);
2634 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2635 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2637 /* TODO: Add several host config files to bootstrap connections.
2638 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2639 * and are not blacklisted.
2641 config_t configs[5];
2642 memset(configs, 0, sizeof(configs));
2645 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2649 /* Append host config files to the invitation file */
2650 packmsg_add_array(&inv, count);
2652 for(int i = 0; i < count; i++) {
2653 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2654 config_free(&configs[i]);
2657 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2659 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2660 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2661 meshlink_errno = MESHLINK_ESTORAGE;
2662 pthread_mutex_unlock(&mesh->mutex);
2666 // Create an URL from the local address, key hash and cookie
2668 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2671 pthread_mutex_unlock(&mesh->mutex);
2675 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2676 return meshlink_invite_ex(mesh, submesh, name, 0);
2679 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2680 if(!mesh || !invitation) {
2681 meshlink_errno = MESHLINK_EINVAL;
2685 join_state_t state = {
2690 ecdsa_t *key = NULL;
2691 ecdsa_t *hiskey = NULL;
2693 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2694 char copy[strlen(invitation) + 1];
2696 pthread_mutex_lock(&mesh->mutex);
2698 //Before doing meshlink_join make sure we are not connected to another mesh
2699 if(mesh->threadstarted) {
2700 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2701 meshlink_errno = MESHLINK_EINVAL;
2705 // 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.
2706 if(mesh->nodes->count > 1) {
2707 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2708 meshlink_errno = MESHLINK_EINVAL;
2712 strcpy(copy, invitation);
2714 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2716 char *slash = strchr(copy, '/');
2724 if(strlen(slash) != 48) {
2728 char *address = copy;
2731 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2735 if(mesh->inviter_commits_first) {
2736 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2739 // Generate a throw-away key for the invitation.
2740 key = ecdsa_generate();
2743 meshlink_errno = MESHLINK_EINTERNAL;
2747 char *b64key = ecdsa_get_base64_public_key(key);
2750 while(address && *address) {
2751 // We allow commas in the address part to support multiple addresses in one invitation URL.
2752 comma = strchr(address, ',');
2758 // Split of the port
2759 port = strrchr(address, ':');
2767 // IPv6 address are enclosed in brackets, per RFC 3986
2768 if(*address == '[') {
2770 char *bracket = strchr(address, ']');
2783 // Connect to the meshlink daemon mentioned in the URL.
2784 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2787 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2788 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2790 if(state.sock == -1) {
2791 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2792 meshlink_errno = MESHLINK_ENETWORK;
2796 set_timeout(state.sock, 5000);
2798 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2799 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2800 meshlink_errno = MESHLINK_ENETWORK;
2801 closesocket(state.sock);
2811 meshlink_errno = MESHLINK_ERESOLV;
2814 if(state.sock != -1 || !comma) {
2821 if(state.sock == -1) {
2825 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2827 // Tell him we have an invitation, and give him our throw-away key.
2831 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2832 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2833 meshlink_errno = MESHLINK_ENETWORK;
2839 char hisname[4096] = "";
2840 int code, hismajor, hisminor = 0;
2842 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) {
2843 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2844 meshlink_errno = MESHLINK_ENETWORK;
2848 // Check if the hash of the key he gave us matches the hash in the URL.
2849 char *fingerprint = state.line + 2;
2852 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2853 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2854 meshlink_errno = MESHLINK_EINTERNAL;
2858 if(memcmp(hishash, state.hash, 18)) {
2859 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2860 meshlink_errno = MESHLINK_EPEER;
2864 hiskey = ecdsa_set_base64_public_key(fingerprint);
2867 meshlink_errno = MESHLINK_EINTERNAL;
2871 // Start an SPTPS session
2872 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2873 meshlink_errno = MESHLINK_EINTERNAL;
2877 // Feed rest of input buffer to SPTPS
2878 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2879 meshlink_errno = MESHLINK_EPEER;
2884 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2886 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2888 if(errno == EINTR) {
2892 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2893 meshlink_errno = MESHLINK_ENETWORK;
2897 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2898 meshlink_errno = MESHLINK_EPEER;
2903 if(!state.success) {
2904 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2905 meshlink_errno = MESHLINK_EPEER;
2909 sptps_stop(&state.sptps);
2912 closesocket(state.sock);
2914 pthread_mutex_unlock(&mesh->mutex);
2918 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2919 meshlink_errno = MESHLINK_EINVAL;
2921 sptps_stop(&state.sptps);
2925 if(state.sock != -1) {
2926 closesocket(state.sock);
2929 pthread_mutex_unlock(&mesh->mutex);
2933 char *meshlink_export(meshlink_handle_t *mesh) {
2935 meshlink_errno = MESHLINK_EINVAL;
2939 // Create a config file on the fly.
2942 packmsg_output_t out = {buf, sizeof(buf)};
2943 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2944 packmsg_add_str(&out, mesh->name);
2945 packmsg_add_str(&out, CORE_MESH);
2947 pthread_mutex_lock(&mesh->mutex);
2949 packmsg_add_int32(&out, mesh->self->devclass);
2950 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2951 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2952 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2956 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2957 if(mesh->self->recent[i].sa.sa_family) {
2964 packmsg_add_array(&out, count);
2966 for(uint32_t i = 0; i < count; i++) {
2967 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2970 packmsg_add_int64(&out, 0);
2971 packmsg_add_int64(&out, 0);
2973 pthread_mutex_unlock(&mesh->mutex);
2975 if(!packmsg_output_ok(&out)) {
2976 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2977 meshlink_errno = MESHLINK_EINTERNAL;
2981 // Prepare a base64-encoded packmsg array containing our config file
2983 uint32_t len = packmsg_output_size(&out, buf);
2984 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2985 uint8_t *buf2 = xmalloc(len2);
2986 packmsg_output_t out2 = {buf2, len2};
2987 packmsg_add_array(&out2, 1);
2988 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2990 if(!packmsg_output_ok(&out2)) {
2991 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2992 meshlink_errno = MESHLINK_EINTERNAL;
2997 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2999 return (char *)buf2;
3002 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3003 if(!mesh || !data) {
3004 meshlink_errno = MESHLINK_EINVAL;
3008 size_t datalen = strlen(data);
3009 uint8_t *buf = xmalloc(datalen);
3010 int buflen = b64decode(data, buf, datalen);
3013 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3014 meshlink_errno = MESHLINK_EPEER;
3018 packmsg_input_t in = {buf, buflen};
3019 uint32_t count = packmsg_get_array(&in);
3022 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3023 meshlink_errno = MESHLINK_EPEER;
3027 pthread_mutex_lock(&mesh->mutex);
3031 uint32_t len = packmsg_get_bin_raw(&in, &data);
3037 packmsg_input_t in2 = {data, len};
3038 uint32_t version = packmsg_get_uint32(&in2);
3039 char *name = packmsg_get_str_dup(&in2);
3041 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3043 packmsg_input_invalidate(&in);
3047 if(!check_id(name)) {
3052 node_t *n = lookup_node(mesh, name);
3055 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3063 config_t config = {data, len};
3065 if(!node_read_from_config(mesh, n, &config)) {
3067 packmsg_input_invalidate(&in);
3071 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3072 n->last_reachable = 0;
3073 n->last_unreachable = 0;
3075 if(!node_write_config(mesh, n)) {
3083 pthread_mutex_unlock(&mesh->mutex);
3087 if(!packmsg_done(&in)) {
3088 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3089 meshlink_errno = MESHLINK_EPEER;
3093 if(!config_sync(mesh, "current")) {
3100 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3101 if(n == mesh->self) {
3102 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3103 meshlink_errno = MESHLINK_EINVAL;
3107 if(n->status.blacklisted) {
3108 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3112 n->status.blacklisted = true;
3114 /* Immediately shut down any connections we have with the blacklisted node.
3115 * We can't call terminate_connection(), because we might be called from a callback function.
3117 for list_each(connection_t, c, mesh->connections) {
3119 shutdown(c->socket, SHUT_RDWR);
3123 utcp_abort_all_connections(n->utcp);
3129 n->status.udp_confirmed = false;
3131 if(n->status.reachable) {
3132 n->last_unreachable = mesh->loop.now.tv_sec;
3135 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3136 * manually call the status callback if necessary.
3138 if(n->status.reachable && mesh->node_status_cb) {
3139 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3142 return node_write_config(mesh, n) && config_sync(mesh, "current");
3145 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3146 if(!mesh || !node) {
3147 meshlink_errno = MESHLINK_EINVAL;
3151 pthread_mutex_lock(&mesh->mutex);
3153 if(!blacklist(mesh, (node_t *)node)) {
3154 pthread_mutex_unlock(&mesh->mutex);
3158 pthread_mutex_unlock(&mesh->mutex);
3160 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3164 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3165 if(!mesh || !name) {
3166 meshlink_errno = MESHLINK_EINVAL;
3170 pthread_mutex_lock(&mesh->mutex);
3172 node_t *n = lookup_node(mesh, (char *)name);
3176 n->name = xstrdup(name);
3180 if(!blacklist(mesh, (node_t *)n)) {
3181 pthread_mutex_unlock(&mesh->mutex);
3185 pthread_mutex_unlock(&mesh->mutex);
3187 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3191 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3192 if(n == mesh->self) {
3193 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3194 meshlink_errno = MESHLINK_EINVAL;
3198 if(!n->status.blacklisted) {
3199 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3203 n->status.blacklisted = false;
3205 if(n->status.reachable) {
3206 n->last_reachable = mesh->loop.now.tv_sec;
3207 update_node_status(mesh, n);
3210 return node_write_config(mesh, n) && config_sync(mesh, "current");
3213 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3214 if(!mesh || !node) {
3215 meshlink_errno = MESHLINK_EINVAL;
3219 pthread_mutex_lock(&mesh->mutex);
3221 if(!whitelist(mesh, (node_t *)node)) {
3222 pthread_mutex_unlock(&mesh->mutex);
3226 pthread_mutex_unlock(&mesh->mutex);
3228 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3232 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3233 if(!mesh || !name) {
3234 meshlink_errno = MESHLINK_EINVAL;
3238 pthread_mutex_lock(&mesh->mutex);
3240 node_t *n = lookup_node(mesh, (char *)name);
3244 n->name = xstrdup(name);
3248 if(!whitelist(mesh, (node_t *)n)) {
3249 pthread_mutex_unlock(&mesh->mutex);
3253 pthread_mutex_unlock(&mesh->mutex);
3255 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3259 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3260 mesh->default_blacklist = blacklist;
3263 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3264 if(!mesh || !node) {
3265 meshlink_errno = MESHLINK_EINVAL;
3269 node_t *n = (node_t *)node;
3271 pthread_mutex_lock(&mesh->mutex);
3273 /* Check that the node is not reachable */
3274 if(n->status.reachable || n->connection) {
3275 pthread_mutex_unlock(&mesh->mutex);
3276 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3280 /* Check that we don't have any active UTCP connections */
3281 if(n->utcp && utcp_is_active(n->utcp)) {
3282 pthread_mutex_unlock(&mesh->mutex);
3283 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3287 /* Check that we have no active connections to this node */
3288 for list_each(connection_t, c, mesh->connections) {
3290 pthread_mutex_unlock(&mesh->mutex);
3291 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3296 /* Remove any pending outgoings to this node */
3297 if(mesh->outgoings) {
3298 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3299 if(outgoing->node == n) {
3300 list_delete_node(mesh->outgoings, node);
3305 /* Delete the config file for this node */
3306 if(!config_delete(mesh, "current", n->name)) {
3307 pthread_mutex_unlock(&mesh->mutex);
3311 /* Delete the node struct and any remaining edges referencing this node */
3314 pthread_mutex_unlock(&mesh->mutex);
3316 return config_sync(mesh, "current");
3319 /* Hint that a hostname may be found at an address
3320 * See header file for detailed comment.
3322 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3323 if(!mesh || !node || !addr) {
3324 meshlink_errno = EINVAL;
3328 pthread_mutex_lock(&mesh->mutex);
3330 node_t *n = (node_t *)node;
3332 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3333 if(!node_write_config(mesh, n)) {
3334 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3338 pthread_mutex_unlock(&mesh->mutex);
3339 // @TODO do we want to fire off a connection attempt right away?
3342 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3344 node_t *n = utcp->priv;
3345 meshlink_handle_t *mesh = n->mesh;
3346 return mesh->channel_accept_cb;
3349 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3351 if(aio->cb.buffer) {
3352 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3356 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3361 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3362 meshlink_channel_t *channel = connection->priv;
3368 node_t *n = channel->node;
3369 meshlink_handle_t *mesh = n->mesh;
3371 if(n->status.destroyed) {
3372 meshlink_channel_close(mesh, channel);
3376 const char *p = data;
3379 while(channel->aio_receive) {
3380 meshlink_aio_buffer_t *aio = channel->aio_receive;
3381 size_t todo = aio->len - aio->done;
3388 memcpy((char *)aio->data + aio->done, p, todo);
3390 ssize_t result = write(aio->fd, p, todo);
3399 if(aio->done == aio->len) {
3400 channel->aio_receive = aio->next;
3401 aio_signal(mesh, channel, aio);
3413 if(channel->receive_cb) {
3414 channel->receive_cb(mesh, channel, p, left);
3420 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3421 node_t *n = utcp_connection->utcp->priv;
3427 meshlink_handle_t *mesh = n->mesh;
3429 if(!mesh->channel_accept_cb) {
3433 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3435 channel->c = utcp_connection;
3437 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3438 utcp_accept(utcp_connection, channel_recv, channel);
3444 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3445 node_t *n = utcp->priv;
3447 if(n->status.destroyed) {
3451 meshlink_handle_t *mesh = n->mesh;
3452 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3455 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3456 if(!mesh || !channel) {
3457 meshlink_errno = MESHLINK_EINVAL;
3461 channel->receive_cb = cb;
3464 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3466 node_t *n = (node_t *)source;
3472 utcp_recv(n->utcp, data, len);
3475 static void channel_poll(struct utcp_connection *connection, size_t len) {
3476 meshlink_channel_t *channel = connection->priv;
3482 node_t *n = channel->node;
3483 meshlink_handle_t *mesh = n->mesh;
3484 meshlink_aio_buffer_t *aio = channel->aio_send;
3487 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3488 size_t left = aio->len - aio->done;
3496 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3499 size_t todo = utcp_get_sndbuf_free(connection);
3505 if(todo > sizeof(buf)) {
3509 ssize_t result = read(aio->fd, buf, todo);
3512 sent = utcp_send(connection, buf, result);
3522 /* If the buffer is now completely sent, call the callback and dispose of it. */
3523 if(aio->done >= aio->len) {
3524 channel->aio_send = aio->next;
3525 aio_signal(mesh, channel, aio);
3529 if(channel->poll_cb) {
3530 channel->poll_cb(mesh, channel, len);
3532 utcp_set_poll_cb(connection, NULL);
3537 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3538 if(!mesh || !channel) {
3539 meshlink_errno = MESHLINK_EINVAL;
3543 pthread_mutex_lock(&mesh->mutex);
3544 channel->poll_cb = cb;
3545 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3546 pthread_mutex_unlock(&mesh->mutex);
3549 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3551 meshlink_errno = MESHLINK_EINVAL;
3555 pthread_mutex_lock(&mesh->mutex);
3556 mesh->channel_accept_cb = cb;
3557 mesh->receive_cb = channel_receive;
3559 for splay_each(node_t, n, mesh->nodes) {
3560 if(!n->utcp && n != mesh->self) {
3561 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3565 pthread_mutex_unlock(&mesh->mutex);
3568 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3572 meshlink_errno = MESHLINK_EINVAL;
3576 pthread_mutex_lock(&mesh->mutex);
3577 utcp_set_sndbuf(channel->c, size);
3578 pthread_mutex_unlock(&mesh->mutex);
3581 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3585 meshlink_errno = MESHLINK_EINVAL;
3589 pthread_mutex_lock(&mesh->mutex);
3590 utcp_set_rcvbuf(channel->c, size);
3591 pthread_mutex_unlock(&mesh->mutex);
3594 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) {
3596 abort(); // TODO: handle non-NULL data
3599 if(!mesh || !node) {
3600 meshlink_errno = MESHLINK_EINVAL;
3604 pthread_mutex_lock(&mesh->mutex);
3606 node_t *n = (node_t *)node;
3609 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3610 mesh->receive_cb = channel_receive;
3613 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3614 pthread_mutex_unlock(&mesh->mutex);
3619 if(n->status.blacklisted) {
3620 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3621 meshlink_errno = MESHLINK_EBLACKLISTED;
3622 pthread_mutex_unlock(&mesh->mutex);
3626 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3628 channel->receive_cb = cb;
3631 channel->priv = (void *)data;
3634 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3636 pthread_mutex_unlock(&mesh->mutex);
3639 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3647 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) {
3648 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3651 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3652 if(!mesh || !channel) {
3653 meshlink_errno = MESHLINK_EINVAL;
3657 pthread_mutex_lock(&mesh->mutex);
3658 utcp_shutdown(channel->c, direction);
3659 pthread_mutex_unlock(&mesh->mutex);
3662 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3663 if(!mesh || !channel) {
3664 meshlink_errno = MESHLINK_EINVAL;
3668 pthread_mutex_lock(&mesh->mutex);
3670 utcp_close(channel->c);
3672 /* Clean up any outstanding AIO buffers. */
3673 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3675 aio_signal(mesh, channel, aio);
3679 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3681 aio_signal(mesh, channel, aio);
3685 pthread_mutex_unlock(&mesh->mutex);
3690 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3691 if(!mesh || !channel) {
3692 meshlink_errno = MESHLINK_EINVAL;
3701 meshlink_errno = MESHLINK_EINVAL;
3705 // TODO: more finegrained locking.
3706 // Ideally we want to put the data into the UTCP connection's send buffer.
3707 // Then, preferably only if there is room in the receiver window,
3708 // kick the meshlink thread to go send packets.
3712 pthread_mutex_lock(&mesh->mutex);
3714 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3715 if(channel->aio_send) {
3718 retval = utcp_send(channel->c, data, len);
3721 pthread_mutex_unlock(&mesh->mutex);
3724 meshlink_errno = MESHLINK_ENETWORK;
3730 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) {
3731 if(!mesh || !channel) {
3732 meshlink_errno = MESHLINK_EINVAL;
3737 meshlink_errno = MESHLINK_EINVAL;
3741 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3744 aio->cb.buffer = cb;
3747 pthread_mutex_lock(&mesh->mutex);
3749 /* Append the AIO buffer descriptor to the end of the chain */
3750 meshlink_aio_buffer_t **p = &channel->aio_send;
3758 /* Ensure the poll callback is set, and call it right now to push data if possible */
3759 utcp_set_poll_cb(channel->c, channel_poll);
3760 channel_poll(channel->c, len);
3762 pthread_mutex_unlock(&mesh->mutex);
3767 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) {
3768 if(!mesh || !channel) {
3769 meshlink_errno = MESHLINK_EINVAL;
3773 if(!len || fd == -1) {
3774 meshlink_errno = MESHLINK_EINVAL;
3778 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3784 pthread_mutex_lock(&mesh->mutex);
3786 /* Append the AIO buffer descriptor to the end of the chain */
3787 meshlink_aio_buffer_t **p = &channel->aio_send;
3795 /* Ensure the poll callback is set, and call it right now to push data if possible */
3796 utcp_set_poll_cb(channel->c, channel_poll);
3797 channel_poll(channel->c, len);
3799 pthread_mutex_unlock(&mesh->mutex);
3804 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) {
3805 if(!mesh || !channel) {
3806 meshlink_errno = MESHLINK_EINVAL;
3811 meshlink_errno = MESHLINK_EINVAL;
3815 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3818 aio->cb.buffer = cb;
3821 pthread_mutex_lock(&mesh->mutex);
3823 /* Append the AIO buffer descriptor to the end of the chain */
3824 meshlink_aio_buffer_t **p = &channel->aio_receive;
3832 pthread_mutex_unlock(&mesh->mutex);
3837 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) {
3838 if(!mesh || !channel) {
3839 meshlink_errno = MESHLINK_EINVAL;
3843 if(!len || fd == -1) {
3844 meshlink_errno = MESHLINK_EINVAL;
3848 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3854 pthread_mutex_lock(&mesh->mutex);
3856 /* Append the AIO buffer descriptor to the end of the chain */
3857 meshlink_aio_buffer_t **p = &channel->aio_receive;
3865 pthread_mutex_unlock(&mesh->mutex);
3870 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3871 if(!mesh || !channel) {
3872 meshlink_errno = MESHLINK_EINVAL;
3876 return channel->c->flags;
3879 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3880 if(!mesh || !channel) {
3881 meshlink_errno = MESHLINK_EINVAL;
3885 return utcp_get_sendq(channel->c);
3888 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3889 if(!mesh || !channel) {
3890 meshlink_errno = MESHLINK_EINVAL;
3894 return utcp_get_recvq(channel->c);
3897 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3898 if(!mesh || !node) {
3899 meshlink_errno = MESHLINK_EINVAL;
3903 node_t *n = (node_t *)node;
3905 pthread_mutex_lock(&mesh->mutex);
3908 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3911 utcp_set_user_timeout(n->utcp, timeout);
3913 pthread_mutex_unlock(&mesh->mutex);
3916 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3917 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3918 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3921 if(mesh->node_status_cb) {
3922 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3925 if(mesh->node_pmtu_cb) {
3926 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3930 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3931 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3932 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3936 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3937 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3941 n->status.duplicate = true;
3942 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3945 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3949 meshlink_errno = MESHLINK_EINVAL;
3953 pthread_mutex_lock(&mesh->mutex);
3955 if(mesh->discovery == enable) {
3959 if(mesh->threadstarted) {
3961 discovery_start(mesh);
3963 discovery_stop(mesh);
3967 mesh->discovery = enable;
3970 pthread_mutex_unlock(&mesh->mutex);
3974 meshlink_errno = MESHLINK_ENOTSUP;
3978 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3979 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3980 meshlink_errno = EINVAL;
3984 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3985 meshlink_errno = EINVAL;
3989 pthread_mutex_lock(&mesh->mutex);
3990 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3991 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3992 pthread_mutex_unlock(&mesh->mutex);
3995 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3996 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3997 meshlink_errno = EINVAL;
4001 if(fast_retry_period < 0) {
4002 meshlink_errno = EINVAL;
4006 pthread_mutex_lock(&mesh->mutex);
4007 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4008 pthread_mutex_unlock(&mesh->mutex);
4011 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4013 meshlink_errno = EINVAL;
4017 pthread_mutex_lock(&mesh->mutex);
4018 mesh->inviter_commits_first = inviter_commits_first;
4019 pthread_mutex_unlock(&mesh->mutex);
4022 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4024 meshlink_errno = EINVAL;
4028 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4029 meshlink_errno = EINVAL;
4033 pthread_mutex_lock(&mesh->mutex);
4034 free(mesh->external_address_url);
4035 mesh->external_address_url = url ? xstrdup(url) : NULL;
4036 pthread_mutex_unlock(&mesh->mutex);
4039 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4042 if(!mesh->connections || !mesh->loop.running) {
4049 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
4050 // We should only call the callback function if we are in the background thread.
4051 if(!mesh->error_cb) {
4055 if(!mesh->threadstarted) {
4059 if(mesh->thread == pthread_self()) {
4060 mesh->error_cb(mesh, meshlink_errno);
4064 static void __attribute__((constructor)) meshlink_init(void) {
4068 static void __attribute__((destructor)) meshlink_exit(void) {