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 assert(pthread_join(thr, NULL) == 0);
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(const 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(const 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"), SOCK_STREAM, 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 static 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]), SOCK_STREAM, 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 data_len = packmsg_get_bin_raw(&in, &data);
716 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
720 packmsg_input_t in2 = {data, data_len};
721 uint32_t version2 = packmsg_get_uint32(&in2);
722 char *name2 = packmsg_get_str_dup(&in2);
724 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
726 packmsg_input_invalidate(&in);
730 if(!check_id(name2)) {
735 if(!strcmp(name2, 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, 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, const 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 assert(pthread_mutex_lock(&mesh->mutex) == 0);
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 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
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 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
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 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
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 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1260 devtool_keyrotate_probe(3);
1262 // Cleanup the "old" confbase sub-directory
1264 if(!config_destroy(mesh->confbase, "old")) {
1265 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1269 // Change the mesh handle key with new key
1271 free(mesh->config_key);
1272 mesh->config_key = new_config_key;
1274 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
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;
1459 // initialize mutexes and conds
1460 pthread_mutexattr_t attr;
1461 assert(pthread_mutexattr_init(&attr) == 0);
1462 assert(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0);
1463 assert(pthread_mutex_init(&mesh->mutex, &attr) == 0);
1464 assert(pthread_cond_init(&mesh->cond, NULL) == 0);
1466 assert(pthread_mutex_init(&mesh->discovery_mutex, NULL) == 0);
1467 assert(pthread_cond_init(&mesh->discovery_cond, NULL) == 0);
1469 assert(pthread_cond_init(&mesh->adns_cond, NULL) == 0);
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)) {
1487 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1488 meshlink_close(mesh);
1489 meshlink_errno = MESHLINK_ESTORAGE;
1493 if(!meshlink_setup(mesh)) {
1494 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1495 meshlink_close(mesh);
1499 if(!meshlink_read_config(mesh)) {
1500 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1501 meshlink_close(mesh);
1507 struct WSAData wsa_state;
1508 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1511 // Setup up everything
1512 // TODO: we should not open listening sockets yet
1514 bool success = false;
1516 if(mesh->netns != -1) {
1520 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1521 void *retval = NULL;
1522 success = pthread_join(thr, &retval) == 0 && retval;
1526 meshlink_errno = MESHLINK_EINTERNAL;
1529 #endif // HAVE_SETNS
1531 success = setup_network(mesh);
1535 meshlink_close(mesh);
1536 meshlink_errno = MESHLINK_ENETWORK;
1540 add_local_addresses(mesh);
1542 if(!node_write_config(mesh, mesh->self)) {
1543 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1547 idle_set(&mesh->loop, idle, mesh);
1549 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1553 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1554 meshlink_submesh_t *s = NULL;
1557 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1558 meshlink_errno = MESHLINK_EINVAL;
1562 if(!submesh || !*submesh) {
1563 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1564 meshlink_errno = MESHLINK_EINVAL;
1569 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1571 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1573 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1578 static void *meshlink_main_loop(void *arg) {
1579 meshlink_handle_t *mesh = arg;
1581 if(mesh->netns != -1) {
1584 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1585 assert(pthread_cond_signal(&mesh->cond) == 0);
1590 assert(pthread_cond_signal(&mesh->cond) == 0);
1592 #endif // HAVE_SETNS
1597 if(mesh->discovery) {
1598 discovery_start(mesh);
1603 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1605 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1606 assert(pthread_cond_broadcast(&mesh->cond) == 0);
1608 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1610 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1615 if(mesh->discovery) {
1616 discovery_stop(mesh);
1624 bool meshlink_start(meshlink_handle_t *mesh) {
1626 meshlink_errno = MESHLINK_EINVAL;
1630 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1632 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1635 assert(mesh->private_key);
1636 assert(mesh->self->ecdsa);
1637 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1639 if(mesh->threadstarted) {
1640 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1641 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1645 if(mesh->listen_socket[0].tcp.fd < 0) {
1646 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1647 meshlink_errno = MESHLINK_ENETWORK;
1651 // TODO: open listening sockets first
1653 //Check that a valid name is set
1655 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1656 meshlink_errno = MESHLINK_EINVAL;
1657 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1661 init_outgoings(mesh);
1664 // Start the main thread
1666 event_loop_start(&mesh->loop);
1668 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1669 pthread_attr_t attr;
1670 assert(pthread_attr_init(&attr) == 0);
1671 assert(pthread_attr_setstacksize(&attr, 1024 * 1024) == 0);
1673 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1674 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1675 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1676 meshlink_errno = MESHLINK_EINTERNAL;
1677 event_loop_stop(&mesh->loop);
1678 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1682 assert(pthread_cond_wait(&mesh->cond, &mesh->mutex) == 0);
1683 mesh->threadstarted = true;
1685 // Ensure we are considered reachable
1688 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1692 void meshlink_stop(meshlink_handle_t *mesh) {
1694 meshlink_errno = MESHLINK_EINVAL;
1698 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1699 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1701 // Shut down the main thread
1702 event_loop_stop(&mesh->loop);
1704 // Send ourselves a UDP packet to kick the event loop
1705 for(int i = 0; i < mesh->listen_sockets; i++) {
1707 socklen_t salen = sizeof(sa);
1709 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1710 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1714 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1715 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1719 if(mesh->threadstarted) {
1720 // Wait for the main thread to finish
1721 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1722 assert(pthread_join(mesh->thread, NULL) == 0);
1723 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1725 mesh->threadstarted = false;
1728 // Close all metaconnections
1729 if(mesh->connections) {
1730 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1732 connection_t *c = node->data;
1734 terminate_connection(mesh, c, false);
1739 exit_outgoings(mesh);
1741 // Ensure we are considered unreachable
1746 // Try to write out any changed node config files, ignore errors at this point.
1748 for splay_each(node_t, n, mesh->nodes) {
1749 if(n->status.dirty) {
1750 n->status.dirty = !node_write_config(mesh, n);
1755 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1758 void meshlink_close(meshlink_handle_t *mesh) {
1760 meshlink_errno = MESHLINK_EINVAL;
1764 // stop can be called even if mesh has not been started
1765 meshlink_stop(mesh);
1767 // lock is not released after this
1768 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1770 // Close and free all resources used.
1772 close_network_connections(mesh);
1774 logger(mesh, MESHLINK_INFO, "Terminating");
1776 event_loop_exit(&mesh->loop);
1780 if(mesh->confbase) {
1786 ecdsa_free(mesh->invitation_key);
1788 if(mesh->netns != -1) {
1792 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1796 meshlink_queue_exit(&mesh->outpacketqueue);
1799 free(mesh->appname);
1800 free(mesh->confbase);
1801 free(mesh->config_key);
1802 free(mesh->external_address_url);
1804 ecdsa_free(mesh->private_key);
1806 if(mesh->invitation_addresses) {
1807 list_delete_list(mesh->invitation_addresses);
1810 main_config_unlock(mesh);
1812 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1813 assert(pthread_mutex_destroy(&mesh->mutex) == 0);
1815 memset(mesh, 0, sizeof(*mesh));
1820 bool meshlink_destroy(const char *confbase) {
1822 meshlink_errno = MESHLINK_EINVAL;
1826 /* Exit early if the confbase directory itself doesn't exist */
1827 if(access(confbase, F_OK) && errno == ENOENT) {
1831 /* Take the lock the same way meshlink_open() would. */
1832 char lockfilename[PATH_MAX];
1833 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1835 FILE *lockfile = fopen(lockfilename, "w+");
1838 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1839 meshlink_errno = MESHLINK_ESTORAGE;
1844 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1848 // TODO: use _locking()?
1851 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1852 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1854 meshlink_errno = MESHLINK_EBUSY;
1860 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1861 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1865 if(unlink(lockfilename)) {
1866 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1868 meshlink_errno = MESHLINK_ESTORAGE;
1874 if(!sync_path(confbase)) {
1875 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1876 meshlink_errno = MESHLINK_ESTORAGE;
1883 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1885 meshlink_errno = MESHLINK_EINVAL;
1889 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1890 mesh->receive_cb = cb;
1891 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1894 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1896 meshlink_errno = MESHLINK_EINVAL;
1900 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1901 mesh->connection_try_cb = cb;
1902 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1905 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1907 meshlink_errno = MESHLINK_EINVAL;
1911 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1912 mesh->node_status_cb = cb;
1913 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1916 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1918 meshlink_errno = MESHLINK_EINVAL;
1922 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1923 mesh->node_pmtu_cb = cb;
1924 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1927 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1929 meshlink_errno = MESHLINK_EINVAL;
1933 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1934 mesh->node_duplicate_cb = cb;
1935 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1938 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1940 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1942 mesh->log_level = cb ? level : 0;
1943 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1946 global_log_level = cb ? level : 0;
1950 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1952 meshlink_errno = MESHLINK_EINVAL;
1956 assert(pthread_mutex_lock(&mesh->mutex) == 0);
1957 mesh->error_cb = cb;
1958 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
1961 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
1962 meshlink_packethdr_t *hdr;
1964 if(len > MAXSIZE - sizeof(*hdr)) {
1965 meshlink_errno = MESHLINK_EINVAL;
1969 node_t *n = (node_t *)destination;
1971 if(n->status.blacklisted) {
1972 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1973 meshlink_errno = MESHLINK_EBLACKLISTED;
1977 // Prepare the packet
1978 packet->probe = false;
1979 packet->tcp = false;
1980 packet->len = len + sizeof(*hdr);
1982 hdr = (meshlink_packethdr_t *)packet->data;
1983 memset(hdr, 0, sizeof(*hdr));
1984 // leave the last byte as 0 to make sure strings are always
1985 // null-terminated if they are longer than the buffer
1986 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
1987 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
1989 memcpy(packet->data + sizeof(*hdr), data, len);
1994 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1996 assert(destination);
2000 // Prepare the packet
2001 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2005 // Send it immediately
2006 route(mesh, mesh->self, mesh->packet);
2011 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2012 // Validate arguments
2013 if(!mesh || !destination) {
2014 meshlink_errno = MESHLINK_EINVAL;
2023 meshlink_errno = MESHLINK_EINVAL;
2027 // Prepare the packet
2028 vpn_packet_t *packet = malloc(sizeof(*packet));
2031 meshlink_errno = MESHLINK_ENOMEM;
2035 if(!prepare_packet(mesh, destination, data, len, packet)) {
2041 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2043 meshlink_errno = MESHLINK_ENOMEM;
2047 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2049 // Notify event loop
2050 signal_trigger(&mesh->loop, &mesh->datafromapp);
2055 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2057 meshlink_handle_t *mesh = data;
2059 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2061 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2062 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2063 mesh->self->in_packets++;
2064 mesh->self->in_bytes += packet->len;
2065 route(mesh, mesh->self, packet);
2070 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2071 if(!mesh || !destination) {
2072 meshlink_errno = MESHLINK_EINVAL;
2076 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2078 node_t *n = (node_t *)destination;
2080 if(!n->status.reachable) {
2081 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2084 } else if(n->mtuprobes > 30 && n->minmtu) {
2085 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2088 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2093 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2094 if(!mesh || !node) {
2095 meshlink_errno = MESHLINK_EINVAL;
2099 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2101 node_t *n = (node_t *)node;
2103 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2104 meshlink_errno = MESHLINK_EINTERNAL;
2105 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2109 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2112 meshlink_errno = MESHLINK_EINTERNAL;
2115 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2119 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2121 meshlink_errno = MESHLINK_EINVAL;
2125 return (meshlink_node_t *)mesh->self;
2128 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2129 if(!mesh || !name) {
2130 meshlink_errno = MESHLINK_EINVAL;
2136 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2137 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2138 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2141 meshlink_errno = MESHLINK_ENOENT;
2144 return (meshlink_node_t *)n;
2147 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2148 if(!mesh || !name) {
2149 meshlink_errno = MESHLINK_EINVAL;
2153 meshlink_submesh_t *submesh = NULL;
2155 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2156 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2157 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2160 meshlink_errno = MESHLINK_ENOENT;
2166 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2167 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2168 meshlink_errno = MESHLINK_EINVAL;
2172 meshlink_node_t **result;
2175 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2177 *nmemb = mesh->nodes->count;
2178 result = realloc(nodes, *nmemb * sizeof(*nodes));
2181 meshlink_node_t **p = result;
2183 for splay_each(node_t, n, mesh->nodes) {
2184 *p++ = (meshlink_node_t *)n;
2189 meshlink_errno = MESHLINK_ENOMEM;
2192 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2197 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) {
2198 meshlink_node_t **result;
2200 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2204 for splay_each(node_t, n, mesh->nodes) {
2205 if(search_node(n, condition)) {
2212 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2216 result = realloc(nodes, *nmemb * sizeof(*nodes));
2219 meshlink_node_t **p = result;
2221 for splay_each(node_t, n, mesh->nodes) {
2222 if(search_node(n, condition)) {
2223 *p++ = (meshlink_node_t *)n;
2229 meshlink_errno = MESHLINK_ENOMEM;
2232 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2237 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2238 dev_class_t *devclass = (dev_class_t *)condition;
2240 if(*devclass == (dev_class_t)node->devclass) {
2247 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2248 if(condition == node->submesh) {
2260 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2261 const struct time_range *range = condition;
2262 time_t start = node->last_reachable;
2263 time_t end = node->last_unreachable;
2273 if(range->end >= range->start) {
2274 return start <= range->end && end >= range->start;
2276 return start > range->start || end < range->end;
2280 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) {
2281 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2282 meshlink_errno = MESHLINK_EINVAL;
2286 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2289 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2290 if(!mesh || !submesh || !nmemb) {
2291 meshlink_errno = MESHLINK_EINVAL;
2295 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2298 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) {
2299 if(!mesh || !nmemb) {
2300 meshlink_errno = MESHLINK_EINVAL;
2304 struct time_range range = {start, end};
2306 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2309 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2310 if(!mesh || !node) {
2311 meshlink_errno = MESHLINK_EINVAL;
2315 dev_class_t devclass;
2317 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2319 devclass = ((node_t *)node)->devclass;
2321 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2326 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2327 if(!mesh || !node) {
2328 meshlink_errno = MESHLINK_EINVAL;
2332 node_t *n = (node_t *)node;
2334 meshlink_submesh_t *s;
2336 s = (meshlink_submesh_t *)n->submesh;
2341 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2342 if(!mesh || !node) {
2343 meshlink_errno = MESHLINK_EINVAL;
2347 node_t *n = (node_t *)node;
2350 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2351 reachable = n->status.reachable && !n->status.blacklisted;
2353 if(last_reachable) {
2354 *last_reachable = n->last_reachable;
2357 if(last_unreachable) {
2358 *last_unreachable = n->last_unreachable;
2361 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2366 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2367 if(!mesh || !data || !len || !signature || !siglen) {
2368 meshlink_errno = MESHLINK_EINVAL;
2372 if(*siglen < MESHLINK_SIGLEN) {
2373 meshlink_errno = MESHLINK_EINVAL;
2377 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2379 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2380 meshlink_errno = MESHLINK_EINTERNAL;
2381 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2385 *siglen = MESHLINK_SIGLEN;
2386 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2390 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2391 if(!mesh || !source || !data || !len || !signature) {
2392 meshlink_errno = MESHLINK_EINVAL;
2396 if(siglen != MESHLINK_SIGLEN) {
2397 meshlink_errno = MESHLINK_EINVAL;
2401 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2405 struct node_t *n = (struct node_t *)source;
2407 if(!node_read_public_key(mesh, n)) {
2408 meshlink_errno = MESHLINK_EINTERNAL;
2411 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2414 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2418 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2419 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2421 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2424 // TODO: Update invitation key if necessary?
2427 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2429 return mesh->invitation_key;
2432 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2433 if(!mesh || !node || !address) {
2434 meshlink_errno = MESHLINK_EINVAL;
2438 if(!is_valid_hostname(address)) {
2439 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2440 meshlink_errno = MESHLINK_EINVAL;
2444 if((node_t *)node != mesh->self && !port) {
2445 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2446 meshlink_errno = MESHLINK_EINVAL;
2451 if(port && !is_valid_port(port)) {
2452 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2453 meshlink_errno = MESHLINK_EINVAL;
2457 char *canonical_address;
2460 xasprintf(&canonical_address, "%s %s", address, port);
2462 canonical_address = xstrdup(address);
2465 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2467 node_t *n = (node_t *)node;
2468 free(n->canonical_address);
2469 n->canonical_address = canonical_address;
2471 if(!node_write_config(mesh, n)) {
2472 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2476 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2478 return config_sync(mesh, "current");
2481 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2482 if(!mesh || !address) {
2483 meshlink_errno = MESHLINK_EINVAL;
2487 if(!is_valid_hostname(address)) {
2488 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2489 meshlink_errno = MESHLINK_EINVAL;
2493 if(port && !is_valid_port(port)) {
2494 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2495 meshlink_errno = MESHLINK_EINVAL;
2502 xasprintf(&combo, "%s/%s", address, port);
2504 combo = xstrdup(address);
2507 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2509 if(!mesh->invitation_addresses) {
2510 mesh->invitation_addresses = list_alloc((list_action_t)free);
2513 list_insert_tail(mesh->invitation_addresses, combo);
2514 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2519 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2521 meshlink_errno = MESHLINK_EINVAL;
2525 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2527 if(mesh->invitation_addresses) {
2528 list_delete_list(mesh->invitation_addresses);
2529 mesh->invitation_addresses = NULL;
2532 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2535 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2536 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2539 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2541 meshlink_errno = MESHLINK_EINVAL;
2545 char *address = meshlink_get_external_address(mesh);
2551 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2557 int meshlink_get_port(meshlink_handle_t *mesh) {
2559 meshlink_errno = MESHLINK_EINVAL;
2564 meshlink_errno = MESHLINK_EINTERNAL;
2570 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2571 port = atoi(mesh->myport);
2572 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2577 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2578 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2579 meshlink_errno = MESHLINK_EINVAL;
2583 if(mesh->myport && port == atoi(mesh->myport)) {
2587 if(!try_bind(mesh, port)) {
2588 meshlink_errno = MESHLINK_ENETWORK;
2592 devtool_trybind_probe();
2596 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2598 if(mesh->threadstarted) {
2599 meshlink_errno = MESHLINK_EINVAL;
2604 xasprintf(&mesh->myport, "%d", port);
2606 /* Close down the network. This also deletes mesh->self. */
2607 close_network_connections(mesh);
2609 /* Recreate mesh->self. */
2610 mesh->self = new_node();
2611 mesh->self->name = xstrdup(mesh->name);
2612 mesh->self->devclass = mesh->devclass;
2613 mesh->self->session_id = mesh->session_id;
2614 xasprintf(&mesh->myport, "%d", port);
2616 if(!node_read_public_key(mesh, mesh->self)) {
2617 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2618 meshlink_errno = MESHLINK_ESTORAGE;
2619 free_node(mesh->self);
2622 } else if(!setup_network(mesh)) {
2623 meshlink_errno = MESHLINK_ENETWORK;
2627 /* Rebuild our own list of recent addresses */
2628 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2629 add_local_addresses(mesh);
2631 /* Write meshlink.conf with the updated port number */
2632 write_main_config_files(mesh);
2634 rval = config_sync(mesh, "current");
2637 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2639 return rval && meshlink_get_port(mesh) == port;
2642 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2643 mesh->invitation_timeout = timeout;
2646 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2647 meshlink_submesh_t *s = NULL;
2650 meshlink_errno = MESHLINK_EINVAL;
2655 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2658 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2659 meshlink_errno = MESHLINK_EINVAL;
2663 s = (meshlink_submesh_t *)mesh->self->submesh;
2666 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2668 // Check validity of the new node's name
2669 if(!check_id(name)) {
2670 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2671 meshlink_errno = MESHLINK_EINVAL;
2672 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2676 // Ensure no host configuration file with that name exists
2677 if(config_exists(mesh, "current", name)) {
2678 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2679 meshlink_errno = MESHLINK_EEXIST;
2680 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2684 // Ensure no other nodes know about this name
2685 if(lookup_node(mesh, name)) {
2686 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2687 meshlink_errno = MESHLINK_EEXIST;
2688 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2692 // Get the local address
2693 char *address = get_my_hostname(mesh, flags);
2696 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2697 meshlink_errno = MESHLINK_ERESOLV;
2698 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2702 if(!refresh_invitation_key(mesh)) {
2703 meshlink_errno = MESHLINK_EINTERNAL;
2704 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2708 // If we changed our own host config file, write it out now
2709 if(mesh->self->status.dirty) {
2710 if(!node_write_config(mesh, mesh->self)) {
2711 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2712 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2719 // Create a hash of the key.
2720 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2721 sha512(fingerprint, strlen(fingerprint), hash);
2722 b64encode_urlsafe(hash, hash, 18);
2724 // Create a random cookie for this invitation.
2726 randomize(cookie, 18);
2728 // Create a filename that doesn't reveal the cookie itself
2729 char buf[18 + strlen(fingerprint)];
2730 char cookiehash[64];
2731 memcpy(buf, cookie, 18);
2732 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2733 sha512(buf, sizeof(buf), cookiehash);
2734 b64encode_urlsafe(cookiehash, cookiehash, 18);
2736 b64encode_urlsafe(cookie, cookie, 18);
2740 /* Construct the invitation file */
2741 uint8_t outbuf[4096];
2742 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2744 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2745 packmsg_add_str(&inv, name);
2746 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2747 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2749 /* TODO: Add several host config files to bootstrap connections.
2750 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2751 * and are not blacklisted.
2753 config_t configs[5];
2754 memset(configs, 0, sizeof(configs));
2757 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2761 /* Append host config files to the invitation file */
2762 packmsg_add_array(&inv, count);
2764 for(int i = 0; i < count; i++) {
2765 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2766 config_free(&configs[i]);
2769 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2771 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2772 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2773 meshlink_errno = MESHLINK_ESTORAGE;
2774 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2778 // Create an URL from the local address, key hash and cookie
2780 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2783 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
2787 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2788 return meshlink_invite_ex(mesh, submesh, name, 0);
2791 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2792 if(!mesh || !invitation) {
2793 meshlink_errno = MESHLINK_EINVAL;
2797 join_state_t state = {
2802 ecdsa_t *key = NULL;
2803 ecdsa_t *hiskey = NULL;
2805 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2806 char copy[strlen(invitation) + 1];
2808 assert(pthread_mutex_lock(&mesh->mutex) == 0);
2810 //Before doing meshlink_join make sure we are not connected to another mesh
2811 if(mesh->threadstarted) {
2812 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2813 meshlink_errno = MESHLINK_EINVAL;
2817 // 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.
2818 if(mesh->nodes->count > 1) {
2819 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2820 meshlink_errno = MESHLINK_EINVAL;
2824 strcpy(copy, invitation);
2826 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2828 char *slash = strchr(copy, '/');
2836 if(strlen(slash) != 48) {
2840 char *address = copy;
2843 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2847 if(mesh->inviter_commits_first) {
2848 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2851 // Generate a throw-away key for the invitation.
2852 key = ecdsa_generate();
2855 meshlink_errno = MESHLINK_EINTERNAL;
2859 char *b64key = ecdsa_get_base64_public_key(key);
2862 while(address && *address) {
2863 // We allow commas in the address part to support multiple addresses in one invitation URL.
2864 comma = strchr(address, ',');
2870 // Split of the port
2871 port = strrchr(address, ':');
2879 // IPv6 address are enclosed in brackets, per RFC 3986
2880 if(*address == '[') {
2882 char *bracket = strchr(address, ']');
2895 // Connect to the meshlink daemon mentioned in the URL.
2896 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 5);
2899 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2900 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
2902 if(state.sock == -1) {
2903 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2904 meshlink_errno = MESHLINK_ENETWORK;
2908 set_timeout(state.sock, 5000);
2910 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2911 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2912 meshlink_errno = MESHLINK_ENETWORK;
2913 closesocket(state.sock);
2923 meshlink_errno = MESHLINK_ERESOLV;
2926 if(state.sock != -1 || !comma) {
2933 if(state.sock == -1) {
2937 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2939 // Tell him we have an invitation, and give him our throw-away key.
2943 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2944 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2945 meshlink_errno = MESHLINK_ENETWORK;
2951 char hisname[4096] = "";
2952 int code, hismajor, hisminor = 0;
2954 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) {
2955 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2956 meshlink_errno = MESHLINK_ENETWORK;
2960 // Check if the hash of the key he gave us matches the hash in the URL.
2961 char *fingerprint = state.line + 2;
2964 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2965 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2966 meshlink_errno = MESHLINK_EINTERNAL;
2970 if(memcmp(hishash, state.hash, 18)) {
2971 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2972 meshlink_errno = MESHLINK_EPEER;
2976 hiskey = ecdsa_set_base64_public_key(fingerprint);
2979 meshlink_errno = MESHLINK_EINTERNAL;
2983 // Start an SPTPS session
2984 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2985 meshlink_errno = MESHLINK_EINTERNAL;
2989 // Feed rest of input buffer to SPTPS
2990 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2991 meshlink_errno = MESHLINK_EPEER;
2996 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2998 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3000 if(errno == EINTR) {
3004 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3005 meshlink_errno = MESHLINK_ENETWORK;
3009 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3010 meshlink_errno = MESHLINK_EPEER;
3015 if(!state.success) {
3016 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3017 meshlink_errno = MESHLINK_EPEER;
3021 sptps_stop(&state.sptps);
3024 closesocket(state.sock);
3026 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3030 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3031 meshlink_errno = MESHLINK_EINVAL;
3033 sptps_stop(&state.sptps);
3037 if(state.sock != -1) {
3038 closesocket(state.sock);
3041 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3045 char *meshlink_export(meshlink_handle_t *mesh) {
3047 meshlink_errno = MESHLINK_EINVAL;
3051 // Create a config file on the fly.
3054 packmsg_output_t out = {buf, sizeof(buf)};
3055 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3056 packmsg_add_str(&out, mesh->name);
3057 packmsg_add_str(&out, CORE_MESH);
3059 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3061 packmsg_add_int32(&out, mesh->self->devclass);
3062 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3063 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3065 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3066 char *canonical_address = NULL;
3067 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3068 packmsg_add_str(&out, canonical_address);
3069 free(canonical_address);
3071 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3076 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3077 if(mesh->self->recent[i].sa.sa_family) {
3084 packmsg_add_array(&out, count);
3086 for(uint32_t i = 0; i < count; i++) {
3087 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3090 packmsg_add_int64(&out, 0);
3091 packmsg_add_int64(&out, 0);
3093 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3095 if(!packmsg_output_ok(&out)) {
3096 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3097 meshlink_errno = MESHLINK_EINTERNAL;
3101 // Prepare a base64-encoded packmsg array containing our config file
3103 uint32_t len = packmsg_output_size(&out, buf);
3104 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3105 uint8_t *buf2 = xmalloc(len2);
3106 packmsg_output_t out2 = {buf2, len2};
3107 packmsg_add_array(&out2, 1);
3108 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3110 if(!packmsg_output_ok(&out2)) {
3111 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3112 meshlink_errno = MESHLINK_EINTERNAL;
3117 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3119 return (char *)buf2;
3122 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3123 if(!mesh || !data) {
3124 meshlink_errno = MESHLINK_EINVAL;
3128 size_t datalen = strlen(data);
3129 uint8_t *buf = xmalloc(datalen);
3130 int buflen = b64decode(data, buf, datalen);
3133 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3134 meshlink_errno = MESHLINK_EPEER;
3138 packmsg_input_t in = {buf, buflen};
3139 uint32_t count = packmsg_get_array(&in);
3142 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3143 meshlink_errno = MESHLINK_EPEER;
3147 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3151 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3157 packmsg_input_t in2 = {data2, len2};
3158 uint32_t version = packmsg_get_uint32(&in2);
3159 char *name = packmsg_get_str_dup(&in2);
3161 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3163 packmsg_input_invalidate(&in);
3167 if(!check_id(name)) {
3172 node_t *n = lookup_node(mesh, name);
3175 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3183 config_t config = {data2, len2};
3185 if(!node_read_from_config(mesh, n, &config)) {
3187 packmsg_input_invalidate(&in);
3191 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3192 n->last_reachable = 0;
3193 n->last_unreachable = 0;
3195 if(!node_write_config(mesh, n)) {
3203 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3207 if(!packmsg_done(&in)) {
3208 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3209 meshlink_errno = MESHLINK_EPEER;
3213 if(!config_sync(mesh, "current")) {
3220 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3221 if(n == mesh->self) {
3222 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3223 meshlink_errno = MESHLINK_EINVAL;
3227 if(n->status.blacklisted) {
3228 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3232 n->status.blacklisted = true;
3234 /* Immediately shut down any connections we have with the blacklisted node.
3235 * We can't call terminate_connection(), because we might be called from a callback function.
3237 for list_each(connection_t, c, mesh->connections) {
3239 shutdown(c->socket, SHUT_RDWR);
3243 utcp_abort_all_connections(n->utcp);
3249 n->status.udp_confirmed = false;
3251 if(n->status.reachable) {
3252 n->last_unreachable = time(NULL);
3255 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3256 * manually call the status callback if necessary.
3258 if(n->status.reachable && mesh->node_status_cb) {
3259 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3262 return node_write_config(mesh, n) && config_sync(mesh, "current");
3265 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3266 if(!mesh || !node) {
3267 meshlink_errno = MESHLINK_EINVAL;
3271 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3273 if(!blacklist(mesh, (node_t *)node)) {
3274 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3278 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3280 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3284 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3285 if(!mesh || !name) {
3286 meshlink_errno = MESHLINK_EINVAL;
3290 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3292 node_t *n = lookup_node(mesh, (char *)name);
3296 n->name = xstrdup(name);
3300 if(!blacklist(mesh, (node_t *)n)) {
3301 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3305 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3307 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3311 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3312 if(n == mesh->self) {
3313 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3314 meshlink_errno = MESHLINK_EINVAL;
3318 if(!n->status.blacklisted) {
3319 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3323 n->status.blacklisted = false;
3325 if(n->status.reachable) {
3326 n->last_reachable = time(NULL);
3327 update_node_status(mesh, n);
3330 return node_write_config(mesh, n) && config_sync(mesh, "current");
3333 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3334 if(!mesh || !node) {
3335 meshlink_errno = MESHLINK_EINVAL;
3339 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3341 if(!whitelist(mesh, (node_t *)node)) {
3342 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3346 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3348 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3352 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3353 if(!mesh || !name) {
3354 meshlink_errno = MESHLINK_EINVAL;
3358 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3360 node_t *n = lookup_node(mesh, (char *)name);
3364 n->name = xstrdup(name);
3368 if(!whitelist(mesh, (node_t *)n)) {
3369 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3373 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3375 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3379 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3380 mesh->default_blacklist = blacklist;
3383 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3384 if(!mesh || !node) {
3385 meshlink_errno = MESHLINK_EINVAL;
3389 node_t *n = (node_t *)node;
3391 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3393 /* Check that the node is not reachable */
3394 if(n->status.reachable || n->connection) {
3395 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3396 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3400 /* Check that we don't have any active UTCP connections */
3401 if(n->utcp && utcp_is_active(n->utcp)) {
3402 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3403 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3407 /* Check that we have no active connections to this node */
3408 for list_each(connection_t, c, mesh->connections) {
3410 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3411 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3416 /* Remove any pending outgoings to this node */
3417 if(mesh->outgoings) {
3418 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3419 if(outgoing->node == n) {
3420 list_delete_node(mesh->outgoings, list_node);
3425 /* Delete the config file for this node */
3426 if(!config_delete(mesh, "current", n->name)) {
3427 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3431 /* Delete the node struct and any remaining edges referencing this node */
3434 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3436 return config_sync(mesh, "current");
3439 /* Hint that a hostname may be found at an address
3440 * See header file for detailed comment.
3442 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3443 if(!mesh || !node || !addr) {
3444 meshlink_errno = EINVAL;
3448 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3450 node_t *n = (node_t *)node;
3452 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3453 if(!node_write_config(mesh, n)) {
3454 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3458 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3459 // @TODO do we want to fire off a connection attempt right away?
3462 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3464 node_t *n = utcp->priv;
3465 meshlink_handle_t *mesh = n->mesh;
3466 return mesh->channel_accept_cb;
3469 /* Finish one AIO buffer, return true if the channel is still open. */
3470 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3471 meshlink_aio_buffer_t *aio = *head;
3475 channel->in_callback = true;
3478 if(aio->cb.buffer) {
3479 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3483 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3487 channel->in_callback = false;
3500 /* Finish all AIO buffers, return true if the channel is still open. */
3501 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3503 if(!aio_finish_one(mesh, channel, head)) {
3511 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3512 meshlink_channel_t *channel = connection->priv;
3518 node_t *n = channel->node;
3519 meshlink_handle_t *mesh = n->mesh;
3521 if(n->status.destroyed) {
3522 meshlink_channel_close(mesh, channel);
3526 const char *p = data;
3529 while(channel->aio_receive) {
3531 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3532 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3539 meshlink_aio_buffer_t *aio = channel->aio_receive;
3540 size_t todo = aio->len - aio->done;
3547 memcpy((char *)aio->data + aio->done, p, todo);
3549 ssize_t result = write(aio->fd, p, todo);
3552 if(result < 0 && errno == EINTR) {
3556 /* Writing to fd failed, cancel just this AIO buffer. */
3557 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3559 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3573 if(aio->done == aio->len) {
3574 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3584 if(channel->receive_cb) {
3585 channel->receive_cb(mesh, channel, p, left);
3591 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3592 node_t *n = utcp_connection->utcp->priv;
3598 meshlink_handle_t *mesh = n->mesh;
3600 if(!mesh->channel_accept_cb) {
3604 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3606 channel->c = utcp_connection;
3608 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3609 utcp_accept(utcp_connection, channel_recv, channel);
3615 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3616 node_t *n = utcp_connection->utcp->priv;
3617 meshlink_handle_t *mesh = n->mesh;
3619 if(n->mtuprobes == 31) {
3620 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3626 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3627 node_t *n = utcp->priv;
3629 if(n->status.destroyed) {
3633 meshlink_handle_t *mesh = n->mesh;
3634 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3637 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3638 if(!mesh || !channel) {
3639 meshlink_errno = MESHLINK_EINVAL;
3643 channel->receive_cb = cb;
3646 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3648 node_t *n = (node_t *)source;
3654 utcp_recv(n->utcp, data, len);
3657 static void channel_poll(struct utcp_connection *connection, size_t len) {
3658 meshlink_channel_t *channel = connection->priv;
3664 node_t *n = channel->node;
3665 meshlink_handle_t *mesh = n->mesh;
3667 while(channel->aio_send) {
3669 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3670 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3677 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3678 meshlink_aio_buffer_t *aio = channel->aio_send;
3679 size_t todo = aio->len - aio->done;
3687 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3689 /* Limit the amount we read at once to avoid stack overflows */
3695 ssize_t result = read(aio->fd, buf, todo);
3699 sent = utcp_send(connection, buf, todo);
3701 if(result < 0 && errno == EINTR) {
3705 /* Reading from fd failed, cancel just this AIO buffer. */
3707 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3710 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3718 if(sent != (ssize_t)todo) {
3719 /* We should never get a partial send at this point */
3722 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3723 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3734 /* If we didn't finish this buffer, exit early. */
3735 if(aio->done < aio->len) {
3739 /* Signal completion of this buffer, and go to the next one. */
3740 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3749 if(channel->poll_cb) {
3750 channel->poll_cb(mesh, channel, len);
3752 utcp_set_poll_cb(connection, NULL);
3756 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3757 if(!mesh || !channel) {
3758 meshlink_errno = MESHLINK_EINVAL;
3762 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3763 channel->poll_cb = cb;
3764 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3765 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3768 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3770 meshlink_errno = MESHLINK_EINVAL;
3774 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3775 mesh->channel_accept_cb = cb;
3776 mesh->receive_cb = channel_receive;
3778 for splay_each(node_t, n, mesh->nodes) {
3779 if(!n->utcp && n != mesh->self) {
3780 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3781 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3782 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3786 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3789 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3793 meshlink_errno = MESHLINK_EINVAL;
3797 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3798 utcp_set_sndbuf(channel->c, size);
3799 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3802 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3806 meshlink_errno = MESHLINK_EINVAL;
3810 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3811 utcp_set_rcvbuf(channel->c, size);
3812 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3815 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) {
3817 abort(); // TODO: handle non-NULL data
3820 if(!mesh || !node) {
3821 meshlink_errno = MESHLINK_EINVAL;
3825 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3827 node_t *n = (node_t *)node;
3830 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3831 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3832 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3833 mesh->receive_cb = channel_receive;
3836 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3837 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3842 if(n->status.blacklisted) {
3843 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3844 meshlink_errno = MESHLINK_EBLACKLISTED;
3845 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3849 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3851 channel->receive_cb = cb;
3854 channel->priv = (void *)data;
3857 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3859 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3862 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3870 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) {
3871 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3874 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3875 if(!mesh || !channel) {
3876 meshlink_errno = MESHLINK_EINVAL;
3880 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3881 utcp_shutdown(channel->c, direction);
3882 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3885 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3886 if(!mesh || !channel) {
3887 meshlink_errno = MESHLINK_EINVAL;
3891 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3894 utcp_close(channel->c);
3897 /* Clean up any outstanding AIO buffers. */
3898 aio_abort(mesh, channel, &channel->aio_send);
3899 aio_abort(mesh, channel, &channel->aio_receive);
3902 if(!channel->in_callback) {
3906 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3909 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3910 if(!mesh || !channel) {
3911 meshlink_errno = MESHLINK_EINVAL;
3920 meshlink_errno = MESHLINK_EINVAL;
3924 // TODO: more finegrained locking.
3925 // Ideally we want to put the data into the UTCP connection's send buffer.
3926 // Then, preferably only if there is room in the receiver window,
3927 // kick the meshlink thread to go send packets.
3931 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3933 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3934 if(channel->aio_send) {
3937 retval = utcp_send(channel->c, data, len);
3940 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3943 meshlink_errno = MESHLINK_ENETWORK;
3949 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) {
3950 if(!mesh || !channel) {
3951 meshlink_errno = MESHLINK_EINVAL;
3956 meshlink_errno = MESHLINK_EINVAL;
3960 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3963 aio->cb.buffer = cb;
3966 assert(pthread_mutex_lock(&mesh->mutex) == 0);
3968 /* Append the AIO buffer descriptor to the end of the chain */
3969 meshlink_aio_buffer_t **p = &channel->aio_send;
3977 /* Ensure the poll callback is set, and call it right now to push data if possible */
3978 utcp_set_poll_cb(channel->c, channel_poll);
3979 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
3982 channel_poll(channel->c, todo);
3985 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
3990 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) {
3991 if(!mesh || !channel) {
3992 meshlink_errno = MESHLINK_EINVAL;
3996 if(!len || fd == -1) {
3997 meshlink_errno = MESHLINK_EINVAL;
4001 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4007 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4009 /* Append the AIO buffer descriptor to the end of the chain */
4010 meshlink_aio_buffer_t **p = &channel->aio_send;
4018 /* Ensure the poll callback is set, and call it right now to push data if possible */
4019 utcp_set_poll_cb(channel->c, channel_poll);
4020 size_t left = utcp_get_rcvbuf_free(channel->c);
4023 channel_poll(channel->c, left);
4026 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4031 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) {
4032 if(!mesh || !channel) {
4033 meshlink_errno = MESHLINK_EINVAL;
4038 meshlink_errno = MESHLINK_EINVAL;
4042 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4045 aio->cb.buffer = cb;
4048 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4050 /* Append the AIO buffer descriptor to the end of the chain */
4051 meshlink_aio_buffer_t **p = &channel->aio_receive;
4059 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4064 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) {
4065 if(!mesh || !channel) {
4066 meshlink_errno = MESHLINK_EINVAL;
4070 if(!len || fd == -1) {
4071 meshlink_errno = MESHLINK_EINVAL;
4075 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4081 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4083 /* Append the AIO buffer descriptor to the end of the chain */
4084 meshlink_aio_buffer_t **p = &channel->aio_receive;
4092 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4097 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4098 if(!mesh || !channel) {
4099 meshlink_errno = MESHLINK_EINVAL;
4103 return channel->c->flags;
4106 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4107 if(!mesh || !channel) {
4108 meshlink_errno = MESHLINK_EINVAL;
4112 return utcp_get_sendq(channel->c);
4115 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4116 if(!mesh || !channel) {
4117 meshlink_errno = MESHLINK_EINVAL;
4121 return utcp_get_recvq(channel->c);
4124 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4125 if(!mesh || !channel) {
4126 meshlink_errno = MESHLINK_EINVAL;
4130 return utcp_get_mss(channel->node->utcp);
4133 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4134 if(!mesh || !node) {
4135 meshlink_errno = MESHLINK_EINVAL;
4139 node_t *n = (node_t *)node;
4141 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4144 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4145 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4146 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4149 utcp_set_user_timeout(n->utcp, timeout);
4151 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4154 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4155 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4156 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4157 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4158 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4161 if(mesh->node_status_cb) {
4162 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4165 if(mesh->node_pmtu_cb) {
4166 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4170 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4171 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4173 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4174 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4178 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4179 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4183 n->status.duplicate = true;
4184 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4187 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4191 meshlink_errno = MESHLINK_EINVAL;
4195 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4197 if(mesh->discovery == enable) {
4201 if(mesh->threadstarted) {
4203 discovery_start(mesh);
4205 discovery_stop(mesh);
4209 mesh->discovery = enable;
4212 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4216 meshlink_errno = MESHLINK_ENOTSUP;
4220 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4221 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4222 meshlink_errno = EINVAL;
4226 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4227 meshlink_errno = EINVAL;
4231 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4232 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4233 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4234 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4237 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4238 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4239 meshlink_errno = EINVAL;
4243 if(fast_retry_period < 0) {
4244 meshlink_errno = EINVAL;
4248 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4249 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4250 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4253 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4255 meshlink_errno = EINVAL;
4259 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4260 mesh->inviter_commits_first = inviter_commits_first;
4261 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4264 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4266 meshlink_errno = EINVAL;
4270 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4271 meshlink_errno = EINVAL;
4275 assert(pthread_mutex_lock(&mesh->mutex) == 0);
4276 free(mesh->external_address_url);
4277 mesh->external_address_url = url ? xstrdup(url) : NULL;
4278 assert(pthread_mutex_unlock(&mesh->mutex) == 0);
4281 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4282 if(!mesh || granularity < 0) {
4283 meshlink_errno = EINVAL;
4287 utcp_set_clock_granularity(granularity);
4290 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4293 if(!mesh->connections || !mesh->loop.running) {
4300 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4301 // We should only call the callback function if we are in the background thread.
4302 if(!mesh->error_cb) {
4306 if(!mesh->threadstarted) {
4310 if(mesh->thread == pthread_self()) {
4311 mesh->error_cb(mesh, cb_errno);
4315 static void __attribute__((constructor)) meshlink_init(void) {
4317 utcp_set_clock_granularity(10000);
4320 static void __attribute__((destructor)) meshlink_exit(void) {