2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.h"
43 #define MSG_NOSIGNAL 0
45 __thread meshlink_errno_t meshlink_errno;
46 meshlink_log_cb_t global_log_cb;
47 meshlink_log_level_t global_log_level;
49 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
51 static int rstrip(char *value) {
52 int len = strlen(value);
54 while(len && strchr("\t\r\n ", value[len - 1])) {
61 static void get_canonical_address(node_t *n, char **hostname, char **port) {
62 if(!n->canonical_address) {
66 *hostname = xstrdup(n->canonical_address);
67 char *space = strchr(*hostname, ' ');
71 *port = xstrdup(space);
75 static bool is_valid_hostname(const char *hostname) {
80 for(const char *p = hostname; *p; p++) {
81 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
89 static bool is_valid_port(const char *port) {
96 unsigned long int result = strtoul(port, &end, 10);
97 return result && result < 65536 && !*end;
100 for(const char *p = port; *p; p++) {
101 if(!(isalnum(*p) || *p == '-')) {
109 static void set_timeout(int sock, int timeout) {
114 tv.tv_sec = timeout / 1000;
115 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
117 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
118 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
121 struct socket_in_netns_params {
130 static void *socket_in_netns_thread(void *arg) {
131 struct socket_in_netns_params *params = arg;
133 if(setns(params->netns, CLONE_NEWNET) == -1) {
134 meshlink_errno = MESHLINK_EINVAL;
138 params->fd = socket(params->domain, params->type, params->protocol);
144 static int socket_in_netns(int domain, int type, int protocol, int netns) {
146 return socket(domain, type, protocol);
150 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
154 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
155 pthread_join(thr, NULL);
165 // Find out what local address a socket would use if we connect to the given address.
166 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
167 // of both endpoints, but this will actually not send any UDP packet.
168 static bool getlocaladdr(char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
169 struct addrinfo *rai = NULL;
170 const struct addrinfo hint = {
171 .ai_family = AF_UNSPEC,
172 .ai_socktype = SOCK_DGRAM,
173 .ai_protocol = IPPROTO_UDP,
176 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
180 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
187 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
195 if(getsockname(sock, &sa->sa, salen)) {
204 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
206 socklen_t salen = sizeof(sa);
208 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
212 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
219 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
220 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
223 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
224 const char *url = mesh->external_address_url;
227 url = "http://meshlink.io/host.cgi";
230 /* Find the hostname part between the slashes */
231 if(strncmp(url, "http://", 7)) {
233 meshlink_errno = MESHLINK_EINTERNAL;
237 const char *begin = url + 7;
239 const char *end = strchr(begin, '/');
242 end = begin + strlen(begin);
246 char host[end - begin + 1];
247 strncpy(host, begin, end - begin);
248 host[end - begin] = 0;
250 char *port = strchr(host, ':');
256 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
257 struct addrinfo *ai = str2addrinfo(host, port ? port : "80", SOCK_STREAM);
259 char *hostname = NULL;
261 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
262 if(family != AF_UNSPEC && aip->ai_family != family) {
266 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
269 set_timeout(s, 5000);
271 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
278 send(s, "GET ", 4, 0);
279 send(s, url, strlen(url), 0);
280 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
281 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
286 if(line[len - 1] == '\n') {
290 char *p = strrchr(line, '\n');
293 hostname = xstrdup(p + 1);
309 // Check that the hostname is reasonable
310 if(hostname && !is_valid_hostname(hostname)) {
316 meshlink_errno = MESHLINK_ERESOLV;
322 static bool is_localaddr(sockaddr_t *sa) {
323 switch(sa->sa.sa_family) {
325 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
328 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
329 return first == 0 || (first & 0xffc0) == 0xfe80;
337 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
340 // Determine address of the local interface used for outgoing connections.
341 char localaddr[NI_MAXHOST];
342 bool success = false;
344 if(family == AF_INET) {
345 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
346 } else if(family == AF_INET6) {
347 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
350 #ifdef HAVE_GETIFADDRS
353 struct ifaddrs *ifa = NULL;
356 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
357 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
359 if(sa->sa.sa_family != family) {
363 if(is_localaddr(sa)) {
367 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
379 meshlink_errno = MESHLINK_ENETWORK;
383 return xstrdup(localaddr);
386 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
387 for(int i = 0; i < n; i++) {
392 // Ignore duplicate hostnames
395 for(int j = 0; j < i; j++) {
400 if(strcmp(host[i], host[j])) {
404 if(strcmp(port[i], port[j])) {
412 if(found || !is_valid_hostname(host[i])) {
422 // This gets the hostname part for use in invitation URLs
423 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
424 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
426 char *hostname[count];
428 char *hostport = NULL;
430 memset(hostname, 0, sizeof(hostname));
431 memset(port, 0, sizeof(port));
433 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
434 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
437 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
438 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
441 // Add all explicitly set invitation addresses
442 if(mesh->invitation_addresses) {
443 for list_each(char, combo, mesh->invitation_addresses) {
444 hostname[n] = xstrdup(combo);
445 char *slash = strrchr(hostname[n], '/');
449 port[n] = xstrdup(slash + 1);
456 // Add local addresses if requested
457 if(flags & MESHLINK_INVITE_LOCAL) {
458 if(flags & MESHLINK_INVITE_IPV4) {
459 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
462 if(flags & MESHLINK_INVITE_IPV6) {
463 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
467 // Add public/canonical addresses if requested
468 if(flags & MESHLINK_INVITE_PUBLIC) {
469 // Try the CanonicalAddress first
470 get_canonical_address(mesh->self, &hostname[n], &port[n]);
472 if(!hostname[n] && count == 4) {
473 if(flags & MESHLINK_INVITE_IPV4) {
474 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
477 if(flags & MESHLINK_INVITE_IPV6) {
478 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
485 for(int i = 0; i < n; i++) {
486 // Ensure we always have a port number
487 if(hostname[i] && !port[i]) {
488 port[i] = xstrdup(mesh->myport);
492 remove_duplicate_hostnames(hostname, port, n);
494 // Resolve the hostnames
495 for(int i = 0; i < n; i++) {
500 // Convert what we have to a sockaddr
501 struct addrinfo *ai_in, *ai_out;
502 struct addrinfo hint = {
503 .ai_family = AF_UNSPEC,
504 .ai_flags = AI_NUMERICSERV,
505 .ai_socktype = SOCK_STREAM,
507 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
513 // Remember the address(es)
514 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
515 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
518 if(flags & MESHLINK_INVITE_NUMERIC) {
519 // We don't need to do any further conversion
524 // Convert it to a hostname
525 char resolved_host[NI_MAXHOST];
526 char resolved_port[NI_MAXSERV];
527 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
529 if(err || !is_valid_hostname(resolved_host)) {
534 // Convert the hostname back to a sockaddr
535 hint.ai_family = ai_in->ai_family;
536 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
543 // Check if it's still the same sockaddr
544 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
546 freeaddrinfo(ai_out);
550 // Yes: replace the hostname with the resolved one
552 hostname[i] = xstrdup(resolved_host);
555 freeaddrinfo(ai_out);
558 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
559 remove_duplicate_hostnames(hostname, port, n);
561 // Concatenate all unique address to the hostport string
562 for(int i = 0; i < n; i++) {
567 // Append the address to the hostport string
569 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
571 hostport = newhostport;
580 static bool try_bind(meshlink_handle_t *mesh, int port) {
581 struct addrinfo *ai = NULL;
582 struct addrinfo hint = {
583 .ai_flags = AI_PASSIVE,
584 .ai_family = AF_UNSPEC,
585 .ai_socktype = SOCK_STREAM,
586 .ai_protocol = IPPROTO_TCP,
590 snprintf(portstr, sizeof(portstr), "%d", port);
592 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
596 bool success = false;
598 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
599 /* Try to bind to TCP. */
601 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
604 if(errno == EADDRINUSE) {
605 /* If this port is in use for any address family, avoid it. */
613 /* If TCP worked, then we require that UDP works as well. */
615 int udp_fd = setup_udp_listen_socket(mesh, aip);
632 int check_port(meshlink_handle_t *mesh) {
633 for(int i = 0; i < 1000; i++) {
634 int port = 0x1000 + prng(mesh, 0x8000);
636 if(try_bind(mesh, port)) {
638 xasprintf(&mesh->myport, "%d", port);
643 meshlink_errno = MESHLINK_ENETWORK;
644 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
648 static bool write_main_config_files(meshlink_handle_t *mesh) {
649 if(!mesh->confbase) {
655 /* Write the main config file */
656 packmsg_output_t out = {buf, sizeof buf};
658 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
659 packmsg_add_str(&out, mesh->name);
660 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
661 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
662 packmsg_add_uint16(&out, atoi(mesh->myport));
664 if(!packmsg_output_ok(&out)) {
668 config_t config = {buf, packmsg_output_size(&out, buf)};
670 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
674 /* Write our own host config file */
675 if(!node_write_config(mesh, mesh->self)) {
683 meshlink_handle_t *mesh;
685 char cookie[18 + 32];
696 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
697 meshlink_handle_t *mesh = state->mesh;
698 packmsg_input_t in = {buf, len};
699 uint32_t version = packmsg_get_uint32(&in);
701 if(version != MESHLINK_INVITATION_VERSION) {
702 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
706 char *name = packmsg_get_str_dup(&in);
707 packmsg_skip_element(&in); /* submesh */
708 dev_class_t devclass = packmsg_get_int32(&in);
709 uint32_t count = packmsg_get_array(&in);
712 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
716 if(!check_id(name)) {
717 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
723 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
729 free(mesh->self->name);
731 mesh->self->name = xstrdup(name);
732 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
734 // Initialize configuration directory
735 if(!config_init(mesh, "current")) {
739 if(!write_main_config_files(mesh)) {
743 // Write host config files
744 for(uint32_t i = 0; i < count; i++) {
746 uint32_t len = packmsg_get_bin_raw(&in, &data);
749 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
753 packmsg_input_t in2 = {data, len};
754 uint32_t version = packmsg_get_uint32(&in2);
755 char *name = packmsg_get_str_dup(&in2);
757 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
759 packmsg_input_invalidate(&in);
763 if(!check_id(name)) {
768 if(!strcmp(name, mesh->name)) {
769 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
771 meshlink_errno = MESHLINK_EPEER;
775 node_t *n = new_node();
778 config_t config = {data, len};
780 if(!node_read_from_config(mesh, n, &config)) {
782 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
783 meshlink_errno = MESHLINK_EPEER;
788 /* The first host config file is of the inviter itself;
789 * remember the address we are currently using for the invitation connection.
792 socklen_t salen = sizeof(sa);
794 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
795 node_add_recent_address(mesh, n, &sa);
799 /* Clear the reachability times, since we ourself have never seen these nodes yet */
800 n->last_reachable = 0;
801 n->last_unreachable = 0;
803 if(!node_write_config(mesh, n)) {
811 /* Ensure the configuration directory metadata is on disk */
812 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
816 if(!mesh->inviter_commits_first) {
817 devtool_set_inviter_commits_first(false);
820 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
822 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
827 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
829 join_state_t *state = handle;
830 const char *ptr = data;
833 int result = send(state->sock, ptr, len, 0);
835 if(result == -1 && errno == EINTR) {
837 } else if(result <= 0) {
848 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
849 join_state_t *state = handle;
850 meshlink_handle_t *mesh = state->mesh;
852 if(mesh->inviter_commits_first) {
854 case SPTPS_HANDSHAKE:
855 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
861 if(!finalize_join(state, msg, len)) {
865 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
866 shutdown(state->sock, SHUT_RDWR);
867 state->success = true;
875 case SPTPS_HANDSHAKE:
876 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
879 return finalize_join(state, msg, len);
882 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
883 shutdown(state->sock, SHUT_RDWR);
884 state->success = true;
895 static bool recvline(join_state_t *state) {
896 char *newline = NULL;
898 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
899 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
901 if(result == -1 && errno == EINTR) {
903 } else if(result <= 0) {
907 state->blen += result;
910 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
914 size_t len = newline - state->buffer;
916 memcpy(state->line, state->buffer, len);
917 state->line[len] = 0;
918 memmove(state->buffer, newline + 1, state->blen - len - 1);
919 state->blen -= len + 1;
924 static bool sendline(int fd, char *format, ...) {
930 va_start(ap, format);
931 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
934 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
942 int result = send(fd, p, blen, MSG_NOSIGNAL);
944 if(result == -1 && errno == EINTR) {
946 } else if(result <= 0) {
957 static const char *errstr[] = {
958 [MESHLINK_OK] = "No error",
959 [MESHLINK_EINVAL] = "Invalid argument",
960 [MESHLINK_ENOMEM] = "Out of memory",
961 [MESHLINK_ENOENT] = "No such node",
962 [MESHLINK_EEXIST] = "Node already exists",
963 [MESHLINK_EINTERNAL] = "Internal error",
964 [MESHLINK_ERESOLV] = "Could not resolve hostname",
965 [MESHLINK_ESTORAGE] = "Storage error",
966 [MESHLINK_ENETWORK] = "Network error",
967 [MESHLINK_EPEER] = "Error communicating with peer",
968 [MESHLINK_ENOTSUP] = "Operation not supported",
969 [MESHLINK_EBUSY] = "MeshLink instance already in use",
970 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
973 const char *meshlink_strerror(meshlink_errno_t err) {
974 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
975 return "Invalid error code";
981 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
982 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
984 mesh->private_key = ecdsa_generate();
985 mesh->invitation_key = ecdsa_generate();
987 if(!mesh->private_key || !mesh->invitation_key) {
988 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
989 meshlink_errno = MESHLINK_EINTERNAL;
993 logger(mesh, MESHLINK_DEBUG, "Done.\n");
998 static struct timeval idle(event_loop_t *loop, void *data) {
1000 meshlink_handle_t *mesh = data;
1001 struct timeval t, tmin = {3600, 0};
1003 for splay_each(node_t, n, mesh->nodes) {
1008 t = utcp_timeout(n->utcp);
1010 if(timercmp(&t, &tmin, <)) {
1018 // Get our local address(es) by simulating connecting to an Internet host.
1019 static void add_local_addresses(meshlink_handle_t *mesh) {
1021 sa.storage.ss_family = AF_UNKNOWN;
1022 socklen_t salen = sizeof(sa);
1026 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1027 sa.in.sin_port = ntohs(atoi(mesh->myport));
1028 node_add_recent_address(mesh, mesh->self, &sa);
1035 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1036 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1037 node_add_recent_address(mesh, mesh->self, &sa);
1041 static bool meshlink_setup(meshlink_handle_t *mesh) {
1042 if(!config_destroy(mesh->confbase, "new")) {
1043 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1044 meshlink_errno = MESHLINK_ESTORAGE;
1048 if(!config_destroy(mesh->confbase, "old")) {
1049 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1050 meshlink_errno = MESHLINK_ESTORAGE;
1054 if(!config_init(mesh, "current")) {
1055 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1056 meshlink_errno = MESHLINK_ESTORAGE;
1060 if(!ecdsa_keygen(mesh)) {
1061 meshlink_errno = MESHLINK_EINTERNAL;
1065 if(check_port(mesh) == 0) {
1066 meshlink_errno = MESHLINK_ENETWORK;
1070 /* Create a node for ourself */
1072 mesh->self = new_node();
1073 mesh->self->name = xstrdup(mesh->name);
1074 mesh->self->devclass = mesh->devclass;
1075 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1076 mesh->self->session_id = mesh->session_id;
1078 if(!write_main_config_files(mesh)) {
1079 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1080 meshlink_errno = MESHLINK_ESTORAGE;
1084 /* Ensure the configuration directory metadata is on disk */
1085 if(!config_sync(mesh, "current")) {
1092 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1095 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1096 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1100 packmsg_input_t in = {config.buf, config.len};
1101 const void *private_key;
1102 const void *invitation_key;
1104 uint32_t version = packmsg_get_uint32(&in);
1105 char *name = packmsg_get_str_dup(&in);
1106 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1107 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1108 uint16_t myport = packmsg_get_uint16(&in);
1110 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1111 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1113 config_free(&config);
1119 // TODO: check this?
1120 if(mesh->name && strcmp(mesh->name, name)) {
1121 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1122 meshlink_errno = MESHLINK_ESTORAGE;
1124 config_free(&config);
1132 xasprintf(&mesh->myport, "%u", myport);
1133 mesh->private_key = ecdsa_set_private_key(private_key);
1134 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1135 config_free(&config);
1137 /* Create a node for ourself and read our host configuration file */
1139 mesh->self = new_node();
1140 mesh->self->name = xstrdup(name);
1141 mesh->self->devclass = mesh->devclass;
1142 mesh->self->session_id = mesh->session_id;
1144 if(!node_read_public_key(mesh, mesh->self)) {
1145 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1146 meshlink_errno = MESHLINK_ESTORAGE;
1147 free_node(mesh->self);
1156 static void *setup_network_in_netns_thread(void *arg) {
1157 meshlink_handle_t *mesh = arg;
1159 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1163 bool success = setup_network(mesh);
1164 add_local_addresses(mesh);
1165 return success ? arg : NULL;
1167 #endif // HAVE_SETNS
1169 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1170 if(!confbase || !*confbase) {
1171 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1172 meshlink_errno = MESHLINK_EINVAL;
1176 if(!appname || !*appname) {
1177 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1178 meshlink_errno = MESHLINK_EINVAL;
1182 if(strchr(appname, ' ')) {
1183 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1184 meshlink_errno = MESHLINK_EINVAL;
1188 if(!name || !*name) {
1189 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1190 meshlink_errno = MESHLINK_EINVAL;
1194 if(!check_id(name)) {
1195 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1196 meshlink_errno = MESHLINK_EINVAL;
1200 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1201 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1202 meshlink_errno = MESHLINK_EINVAL;
1206 meshlink_open_params_t *params = xzalloc(sizeof * params);
1208 params->confbase = xstrdup(confbase);
1209 params->name = xstrdup(name);
1210 params->appname = xstrdup(appname);
1211 params->devclass = devclass;
1217 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1219 meshlink_errno = MESHLINK_EINVAL;
1223 params->netns = netns;
1228 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1230 meshlink_errno = MESHLINK_EINVAL;
1234 if((!key && keylen) || (key && !keylen)) {
1235 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1236 meshlink_errno = MESHLINK_EINVAL;
1241 params->keylen = keylen;
1246 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1247 if(!mesh || !new_key || !new_keylen) {
1248 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1249 meshlink_errno = MESHLINK_EINVAL;
1253 pthread_mutex_lock(&mesh->mutex);
1255 // Create hash for the new key
1256 void *new_config_key;
1257 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1259 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1260 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1261 meshlink_errno = MESHLINK_EINTERNAL;
1262 pthread_mutex_unlock(&mesh->mutex);
1266 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1268 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1269 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1270 meshlink_errno = MESHLINK_ESTORAGE;
1271 pthread_mutex_unlock(&mesh->mutex);
1275 devtool_keyrotate_probe(1);
1277 // Rename confbase/current/ to confbase/old
1279 if(!config_rename(mesh, "current", "old")) {
1280 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1281 meshlink_errno = MESHLINK_ESTORAGE;
1282 pthread_mutex_unlock(&mesh->mutex);
1286 devtool_keyrotate_probe(2);
1288 // Rename confbase/new/ to confbase/current
1290 if(!config_rename(mesh, "new", "current")) {
1291 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1292 meshlink_errno = MESHLINK_ESTORAGE;
1293 pthread_mutex_unlock(&mesh->mutex);
1297 devtool_keyrotate_probe(3);
1299 // Cleanup the "old" confbase sub-directory
1301 if(!config_destroy(mesh->confbase, "old")) {
1302 pthread_mutex_unlock(&mesh->mutex);
1306 // Change the mesh handle key with new key
1308 free(mesh->config_key);
1309 mesh->config_key = new_config_key;
1311 pthread_mutex_unlock(&mesh->mutex);
1316 void meshlink_open_params_free(meshlink_open_params_t *params) {
1318 meshlink_errno = MESHLINK_EINVAL;
1322 free(params->confbase);
1324 free(params->appname);
1329 /// Device class traits
1330 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1331 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1332 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1333 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1334 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1337 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1338 if(!confbase || !*confbase) {
1339 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1340 meshlink_errno = MESHLINK_EINVAL;
1344 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1345 meshlink_open_params_t params;
1346 memset(¶ms, 0, sizeof(params));
1348 params.confbase = (char *)confbase;
1349 params.name = (char *)name;
1350 params.appname = (char *)appname;
1351 params.devclass = devclass;
1354 return meshlink_open_ex(¶ms);
1357 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) {
1358 if(!confbase || !*confbase) {
1359 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1360 meshlink_errno = MESHLINK_EINVAL;
1364 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1365 meshlink_open_params_t params;
1366 memset(¶ms, 0, sizeof(params));
1368 params.confbase = (char *)confbase;
1369 params.name = (char *)name;
1370 params.appname = (char *)appname;
1371 params.devclass = devclass;
1374 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1378 return meshlink_open_ex(¶ms);
1381 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1382 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1383 meshlink_open_params_t params;
1384 memset(¶ms, 0, sizeof(params));
1386 params.name = (char *)name;
1387 params.appname = (char *)appname;
1388 params.devclass = devclass;
1391 return meshlink_open_ex(¶ms);
1394 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1395 // Validate arguments provided by the application
1396 bool usingname = false;
1398 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1400 if(!params->appname || !*params->appname) {
1401 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1402 meshlink_errno = MESHLINK_EINVAL;
1406 if(strchr(params->appname, ' ')) {
1407 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1408 meshlink_errno = MESHLINK_EINVAL;
1412 if(!params->name || !*params->name) {
1413 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1415 } else { //check name only if there is a name != NULL
1417 if(!check_id(params->name)) {
1418 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1419 meshlink_errno = MESHLINK_EINVAL;
1426 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1427 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1428 meshlink_errno = MESHLINK_EINVAL;
1432 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1433 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1434 meshlink_errno = MESHLINK_EINVAL;
1438 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1440 if(params->confbase) {
1441 mesh->confbase = xstrdup(params->confbase);
1444 mesh->appname = xstrdup(params->appname);
1445 mesh->devclass = params->devclass;
1446 mesh->discovery = true;
1447 mesh->invitation_timeout = 604800; // 1 week
1448 mesh->netns = params->netns;
1449 mesh->submeshes = NULL;
1450 mesh->log_cb = global_log_cb;
1451 mesh->log_level = global_log_level;
1453 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1456 randomize(&mesh->session_id, sizeof(mesh->session_id));
1457 } while(mesh->session_id == 0);
1459 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1462 mesh->name = xstrdup(params->name);
1467 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1469 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1470 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1471 meshlink_close(mesh);
1472 meshlink_errno = MESHLINK_EINTERNAL;
1478 pthread_mutexattr_t attr;
1479 pthread_mutexattr_init(&attr);
1480 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1481 pthread_mutex_init(&mesh->mutex, &attr);
1483 mesh->threadstarted = false;
1484 event_loop_init(&mesh->loop);
1485 mesh->loop.data = mesh;
1487 meshlink_queue_init(&mesh->outpacketqueue);
1489 // Atomically lock the configuration directory.
1490 if(!main_config_lock(mesh)) {
1491 meshlink_close(mesh);
1495 // If no configuration exists yet, create it.
1497 if(!meshlink_confbase_exists(mesh)) {
1498 if(!meshlink_setup(mesh)) {
1499 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1500 meshlink_close(mesh);
1504 if(!meshlink_read_config(mesh)) {
1505 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1506 meshlink_close(mesh);
1512 struct WSAData wsa_state;
1513 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1516 // Setup up everything
1517 // TODO: we should not open listening sockets yet
1519 bool success = false;
1521 if(mesh->netns != -1) {
1525 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1526 void *retval = NULL;
1527 success = pthread_join(thr, &retval) == 0 && retval;
1531 meshlink_errno = MESHLINK_EINTERNAL;
1534 #endif // HAVE_SETNS
1536 success = setup_network(mesh);
1537 add_local_addresses(mesh);
1541 meshlink_close(mesh);
1542 meshlink_errno = MESHLINK_ENETWORK;
1546 add_local_addresses(mesh);
1548 if(!node_write_config(mesh, mesh->self)) {
1549 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1553 idle_set(&mesh->loop, idle, mesh);
1555 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1559 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1560 meshlink_submesh_t *s = NULL;
1563 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1564 meshlink_errno = MESHLINK_EINVAL;
1568 if(!submesh || !*submesh) {
1569 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1570 meshlink_errno = MESHLINK_EINVAL;
1575 pthread_mutex_lock(&mesh->mutex);
1577 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1579 pthread_mutex_unlock(&mesh->mutex);
1584 static void *meshlink_main_loop(void *arg) {
1585 meshlink_handle_t *mesh = arg;
1587 if(mesh->netns != -1) {
1590 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1591 pthread_cond_signal(&mesh->cond);
1596 pthread_cond_signal(&mesh->cond);
1598 #endif // HAVE_SETNS
1603 if(mesh->discovery) {
1604 discovery_start(mesh);
1609 pthread_mutex_lock(&mesh->mutex);
1611 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1612 pthread_cond_broadcast(&mesh->cond);
1614 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1616 pthread_mutex_unlock(&mesh->mutex);
1621 if(mesh->discovery) {
1622 discovery_stop(mesh);
1630 bool meshlink_start(meshlink_handle_t *mesh) {
1632 meshlink_errno = MESHLINK_EINVAL;
1636 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1638 pthread_mutex_lock(&mesh->mutex);
1641 assert(mesh->private_key);
1642 assert(mesh->self->ecdsa);
1643 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1645 if(mesh->threadstarted) {
1646 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1647 pthread_mutex_unlock(&mesh->mutex);
1651 if(mesh->listen_socket[0].tcp.fd < 0) {
1652 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1653 meshlink_errno = MESHLINK_ENETWORK;
1657 // TODO: open listening sockets first
1659 //Check that a valid name is set
1661 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1662 meshlink_errno = MESHLINK_EINVAL;
1663 pthread_mutex_unlock(&mesh->mutex);
1667 init_outgoings(mesh);
1669 // Start the main thread
1671 event_loop_start(&mesh->loop);
1673 if(pthread_create(&mesh->thread, NULL, 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 pthread_mutex_unlock(&mesh->mutex);
1682 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1683 mesh->threadstarted = true;
1685 // Ensure we are considered reachable
1688 pthread_mutex_unlock(&mesh->mutex);
1692 void meshlink_stop(meshlink_handle_t *mesh) {
1694 meshlink_errno = MESHLINK_EINVAL;
1698 pthread_mutex_lock(&mesh->mutex);
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 pthread_mutex_unlock(&mesh->mutex);
1722 pthread_join(mesh->thread, NULL);
1723 pthread_mutex_lock(&mesh->mutex);
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);
1738 exit_outgoings(mesh);
1740 // Ensure we are considered unreachable
1745 // Try to write out any changed node config files, ignore errors at this point.
1747 for splay_each(node_t, n, mesh->nodes) {
1748 if(n->status.dirty) {
1749 n->status.dirty = !node_write_config(mesh, n);
1754 pthread_mutex_unlock(&mesh->mutex);
1757 void meshlink_close(meshlink_handle_t *mesh) {
1759 meshlink_errno = MESHLINK_EINVAL;
1763 // stop can be called even if mesh has not been started
1764 meshlink_stop(mesh);
1766 // lock is not released after this
1767 pthread_mutex_lock(&mesh->mutex);
1769 // Close and free all resources used.
1771 close_network_connections(mesh);
1773 logger(mesh, MESHLINK_INFO, "Terminating");
1775 event_loop_exit(&mesh->loop);
1779 if(mesh->confbase) {
1785 ecdsa_free(mesh->invitation_key);
1787 if(mesh->netns != -1) {
1791 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1795 meshlink_queue_exit(&mesh->outpacketqueue);
1798 free(mesh->appname);
1799 free(mesh->confbase);
1800 free(mesh->config_key);
1801 free(mesh->external_address_url);
1802 ecdsa_free(mesh->private_key);
1804 if(mesh->invitation_addresses) {
1805 list_delete_list(mesh->invitation_addresses);
1808 main_config_unlock(mesh);
1810 pthread_mutex_unlock(&mesh->mutex);
1811 pthread_mutex_destroy(&mesh->mutex);
1813 memset(mesh, 0, sizeof(*mesh));
1818 bool meshlink_destroy(const char *confbase) {
1820 meshlink_errno = MESHLINK_EINVAL;
1824 /* Exit early if the confbase directory itself doesn't exist */
1825 if(access(confbase, F_OK) && errno == ENOENT) {
1829 /* Take the lock the same way meshlink_open() would. */
1830 char lockfilename[PATH_MAX];
1831 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1833 FILE *lockfile = fopen(lockfilename, "w+");
1836 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1837 meshlink_errno = MESHLINK_ESTORAGE;
1842 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1846 // TODO: use _locking()?
1849 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1850 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1852 meshlink_errno = MESHLINK_EBUSY;
1858 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1859 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1863 if(unlink(lockfilename)) {
1864 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1866 meshlink_errno = MESHLINK_ESTORAGE;
1872 if(!sync_path(confbase)) {
1873 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1874 meshlink_errno = MESHLINK_ESTORAGE;
1881 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1883 meshlink_errno = MESHLINK_EINVAL;
1887 pthread_mutex_lock(&mesh->mutex);
1888 mesh->receive_cb = cb;
1889 pthread_mutex_unlock(&mesh->mutex);
1892 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1894 meshlink_errno = MESHLINK_EINVAL;
1898 pthread_mutex_lock(&mesh->mutex);
1899 mesh->connection_try_cb = cb;
1900 pthread_mutex_unlock(&mesh->mutex);
1903 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1905 meshlink_errno = MESHLINK_EINVAL;
1909 pthread_mutex_lock(&mesh->mutex);
1910 mesh->node_status_cb = cb;
1911 pthread_mutex_unlock(&mesh->mutex);
1914 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1916 meshlink_errno = MESHLINK_EINVAL;
1920 pthread_mutex_lock(&mesh->mutex);
1921 mesh->node_pmtu_cb = cb;
1922 pthread_mutex_unlock(&mesh->mutex);
1925 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1927 meshlink_errno = MESHLINK_EINVAL;
1931 pthread_mutex_lock(&mesh->mutex);
1932 mesh->node_duplicate_cb = cb;
1933 pthread_mutex_unlock(&mesh->mutex);
1936 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1938 pthread_mutex_lock(&mesh->mutex);
1940 mesh->log_level = cb ? level : 0;
1941 pthread_mutex_unlock(&mesh->mutex);
1944 global_log_level = cb ? level : 0;
1948 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1950 meshlink_errno = MESHLINK_EINVAL;
1954 pthread_mutex_lock(&mesh->mutex);
1955 mesh->error_cb = cb;
1956 pthread_mutex_unlock(&mesh->mutex);
1959 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1960 meshlink_packethdr_t *hdr;
1962 // Validate arguments
1963 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1964 meshlink_errno = MESHLINK_EINVAL;
1973 meshlink_errno = MESHLINK_EINVAL;
1977 node_t *n = (node_t *)destination;
1979 if(n->status.blacklisted) {
1980 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1981 meshlink_errno = MESHLINK_EBLACKLISTED;
1985 // Prepare the packet
1986 vpn_packet_t *packet = malloc(sizeof(*packet));
1989 meshlink_errno = MESHLINK_ENOMEM;
1993 packet->probe = false;
1994 packet->tcp = false;
1995 packet->len = len + sizeof(*hdr);
1997 hdr = (meshlink_packethdr_t *)packet->data;
1998 memset(hdr, 0, sizeof(*hdr));
1999 // leave the last byte as 0 to make sure strings are always
2000 // null-terminated if they are longer than the buffer
2001 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
2002 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
2004 memcpy(packet->data + sizeof(*hdr), data, len);
2007 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2009 meshlink_errno = MESHLINK_ENOMEM;
2013 // Notify event loop
2014 signal_trigger(&mesh->loop, &mesh->datafromapp);
2019 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2021 meshlink_handle_t *mesh = data;
2022 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
2028 mesh->self->in_packets++;
2029 mesh->self->in_bytes += packet->len;
2030 route(mesh, mesh->self, packet);
2035 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2036 if(!mesh || !destination) {
2037 meshlink_errno = MESHLINK_EINVAL;
2041 pthread_mutex_lock(&mesh->mutex);
2043 node_t *n = (node_t *)destination;
2045 if(!n->status.reachable) {
2046 pthread_mutex_unlock(&mesh->mutex);
2049 } else if(n->mtuprobes > 30 && n->minmtu) {
2050 pthread_mutex_unlock(&mesh->mutex);
2053 pthread_mutex_unlock(&mesh->mutex);
2058 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2059 if(!mesh || !node) {
2060 meshlink_errno = MESHLINK_EINVAL;
2064 pthread_mutex_lock(&mesh->mutex);
2066 node_t *n = (node_t *)node;
2068 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2069 meshlink_errno = MESHLINK_EINTERNAL;
2070 pthread_mutex_unlock(&mesh->mutex);
2074 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2077 meshlink_errno = MESHLINK_EINTERNAL;
2080 pthread_mutex_unlock(&mesh->mutex);
2084 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2086 meshlink_errno = MESHLINK_EINVAL;
2090 return (meshlink_node_t *)mesh->self;
2093 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2094 if(!mesh || !name) {
2095 meshlink_errno = MESHLINK_EINVAL;
2101 pthread_mutex_lock(&mesh->mutex);
2102 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2103 pthread_mutex_unlock(&mesh->mutex);
2106 meshlink_errno = MESHLINK_ENOENT;
2109 return (meshlink_node_t *)n;
2112 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2113 if(!mesh || !name) {
2114 meshlink_errno = MESHLINK_EINVAL;
2118 meshlink_submesh_t *submesh = NULL;
2120 pthread_mutex_lock(&mesh->mutex);
2121 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2122 pthread_mutex_unlock(&mesh->mutex);
2125 meshlink_errno = MESHLINK_ENOENT;
2131 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2132 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2133 meshlink_errno = MESHLINK_EINVAL;
2137 meshlink_node_t **result;
2140 pthread_mutex_lock(&mesh->mutex);
2142 *nmemb = mesh->nodes->count;
2143 result = realloc(nodes, *nmemb * sizeof(*nodes));
2146 meshlink_node_t **p = result;
2148 for splay_each(node_t, n, mesh->nodes) {
2149 *p++ = (meshlink_node_t *)n;
2154 meshlink_errno = MESHLINK_ENOMEM;
2157 pthread_mutex_unlock(&mesh->mutex);
2162 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) {
2163 meshlink_node_t **result;
2165 pthread_mutex_lock(&mesh->mutex);
2169 for splay_each(node_t, n, mesh->nodes) {
2170 if(search_node(n, condition)) {
2177 pthread_mutex_unlock(&mesh->mutex);
2181 result = realloc(nodes, *nmemb * sizeof(*nodes));
2184 meshlink_node_t **p = result;
2186 for splay_each(node_t, n, mesh->nodes) {
2187 if(search_node(n, condition)) {
2188 *p++ = (meshlink_node_t *)n;
2194 meshlink_errno = MESHLINK_ENOMEM;
2197 pthread_mutex_unlock(&mesh->mutex);
2202 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2203 dev_class_t *devclass = (dev_class_t *)condition;
2205 if(*devclass == (dev_class_t)node->devclass) {
2212 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2213 if(condition == node->submesh) {
2225 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2226 const struct time_range *range = condition;
2227 time_t start = node->last_reachable;
2228 time_t end = node->last_unreachable;
2238 if(range->end >= range->start) {
2239 return start <= range->end && end >= range->start;
2241 return start > range->start || end < range->end;
2245 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) {
2246 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2247 meshlink_errno = MESHLINK_EINVAL;
2251 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2254 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2255 if(!mesh || !submesh || !nmemb) {
2256 meshlink_errno = MESHLINK_EINVAL;
2260 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2263 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) {
2264 if(!mesh || !nmemb) {
2265 meshlink_errno = MESHLINK_EINVAL;
2269 struct time_range range = {start, end};
2271 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2274 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2275 if(!mesh || !node) {
2276 meshlink_errno = MESHLINK_EINVAL;
2280 dev_class_t devclass;
2282 pthread_mutex_lock(&mesh->mutex);
2284 devclass = ((node_t *)node)->devclass;
2286 pthread_mutex_unlock(&mesh->mutex);
2291 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2292 if(!mesh || !node) {
2293 meshlink_errno = MESHLINK_EINVAL;
2297 node_t *n = (node_t *)node;
2299 meshlink_submesh_t *s;
2301 s = (meshlink_submesh_t *)n->submesh;
2306 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2307 if(!mesh || !node) {
2308 meshlink_errno = MESHLINK_EINVAL;
2312 node_t *n = (node_t *)node;
2315 pthread_mutex_lock(&mesh->mutex);
2316 reachable = n->status.reachable && !n->status.blacklisted;
2318 if(last_reachable) {
2319 *last_reachable = n->last_reachable;
2322 if(last_unreachable) {
2323 *last_unreachable = n->last_unreachable;
2326 pthread_mutex_unlock(&mesh->mutex);
2331 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2332 if(!mesh || !data || !len || !signature || !siglen) {
2333 meshlink_errno = MESHLINK_EINVAL;
2337 if(*siglen < MESHLINK_SIGLEN) {
2338 meshlink_errno = MESHLINK_EINVAL;
2342 pthread_mutex_lock(&mesh->mutex);
2344 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2345 meshlink_errno = MESHLINK_EINTERNAL;
2346 pthread_mutex_unlock(&mesh->mutex);
2350 *siglen = MESHLINK_SIGLEN;
2351 pthread_mutex_unlock(&mesh->mutex);
2355 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2356 if(!mesh || !source || !data || !len || !signature) {
2357 meshlink_errno = MESHLINK_EINVAL;
2361 if(siglen != MESHLINK_SIGLEN) {
2362 meshlink_errno = MESHLINK_EINVAL;
2366 pthread_mutex_lock(&mesh->mutex);
2370 struct node_t *n = (struct node_t *)source;
2372 if(!node_read_public_key(mesh, n)) {
2373 meshlink_errno = MESHLINK_EINTERNAL;
2376 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2379 pthread_mutex_unlock(&mesh->mutex);
2383 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2384 pthread_mutex_lock(&mesh->mutex);
2386 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2389 // TODO: Update invitation key if necessary?
2392 pthread_mutex_unlock(&mesh->mutex);
2394 return mesh->invitation_key;
2397 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2398 if(!mesh || !node || !address) {
2399 meshlink_errno = MESHLINK_EINVAL;
2403 if(!is_valid_hostname(address)) {
2404 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2405 meshlink_errno = MESHLINK_EINVAL;
2409 if(port && !is_valid_port(port)) {
2410 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2411 meshlink_errno = MESHLINK_EINVAL;
2415 char *canonical_address;
2418 xasprintf(&canonical_address, "%s %s", address, port);
2420 canonical_address = xstrdup(address);
2423 pthread_mutex_lock(&mesh->mutex);
2425 node_t *n = (node_t *)node;
2426 free(n->canonical_address);
2427 n->canonical_address = canonical_address;
2429 if(!node_write_config(mesh, n)) {
2430 pthread_mutex_unlock(&mesh->mutex);
2434 pthread_mutex_unlock(&mesh->mutex);
2436 return config_sync(mesh, "current");
2439 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2440 if(!mesh || !address) {
2441 meshlink_errno = MESHLINK_EINVAL;
2445 if(!is_valid_hostname(address)) {
2446 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2447 meshlink_errno = MESHLINK_EINVAL;
2451 if(port && !is_valid_port(port)) {
2452 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2453 meshlink_errno = MESHLINK_EINVAL;
2460 xasprintf(&combo, "%s/%s", address, port);
2462 combo = xstrdup(address);
2465 pthread_mutex_lock(&mesh->mutex);
2467 if(!mesh->invitation_addresses) {
2468 mesh->invitation_addresses = list_alloc((list_action_t)free);
2471 list_insert_tail(mesh->invitation_addresses, combo);
2472 pthread_mutex_unlock(&mesh->mutex);
2477 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2479 meshlink_errno = MESHLINK_EINVAL;
2483 pthread_mutex_lock(&mesh->mutex);
2485 if(mesh->invitation_addresses) {
2486 list_delete_list(mesh->invitation_addresses);
2487 mesh->invitation_addresses = NULL;
2490 pthread_mutex_unlock(&mesh->mutex);
2493 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2494 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2497 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2499 meshlink_errno = MESHLINK_EINVAL;
2503 char *address = meshlink_get_external_address(mesh);
2509 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2515 int meshlink_get_port(meshlink_handle_t *mesh) {
2517 meshlink_errno = MESHLINK_EINVAL;
2522 meshlink_errno = MESHLINK_EINTERNAL;
2528 pthread_mutex_lock(&mesh->mutex);
2529 port = atoi(mesh->myport);
2530 pthread_mutex_unlock(&mesh->mutex);
2535 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2536 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2537 meshlink_errno = MESHLINK_EINVAL;
2541 if(mesh->myport && port == atoi(mesh->myport)) {
2545 if(!try_bind(mesh, port)) {
2546 meshlink_errno = MESHLINK_ENETWORK;
2550 devtool_trybind_probe();
2554 pthread_mutex_lock(&mesh->mutex);
2556 if(mesh->threadstarted) {
2557 meshlink_errno = MESHLINK_EINVAL;
2562 xasprintf(&mesh->myport, "%d", port);
2564 /* Close down the network. This also deletes mesh->self. */
2565 close_network_connections(mesh);
2567 /* Recreate mesh->self. */
2568 mesh->self = new_node();
2569 mesh->self->name = xstrdup(mesh->name);
2570 mesh->self->devclass = mesh->devclass;
2571 mesh->self->session_id = mesh->session_id;
2572 xasprintf(&mesh->myport, "%d", port);
2574 if(!node_read_public_key(mesh, mesh->self)) {
2575 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2576 meshlink_errno = MESHLINK_ESTORAGE;
2577 free_node(mesh->self);
2580 } else if(!setup_network(mesh)) {
2581 meshlink_errno = MESHLINK_ENETWORK;
2585 /* Rebuild our own list of recent addresses */
2586 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2587 add_local_addresses(mesh);
2589 /* Write meshlink.conf with the updated port number */
2590 write_main_config_files(mesh);
2592 rval = config_sync(mesh, "current");
2595 pthread_mutex_unlock(&mesh->mutex);
2597 return rval && meshlink_get_port(mesh) == port;
2600 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2601 mesh->invitation_timeout = timeout;
2604 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2605 meshlink_submesh_t *s = NULL;
2608 meshlink_errno = MESHLINK_EINVAL;
2613 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2616 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2617 meshlink_errno = MESHLINK_EINVAL;
2621 s = (meshlink_submesh_t *)mesh->self->submesh;
2624 pthread_mutex_lock(&mesh->mutex);
2626 // Check validity of the new node's name
2627 if(!check_id(name)) {
2628 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2629 meshlink_errno = MESHLINK_EINVAL;
2630 pthread_mutex_unlock(&mesh->mutex);
2634 // Ensure no host configuration file with that name exists
2635 if(config_exists(mesh, "current", name)) {
2636 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2637 meshlink_errno = MESHLINK_EEXIST;
2638 pthread_mutex_unlock(&mesh->mutex);
2642 // Ensure no other nodes know about this name
2643 if(lookup_node(mesh, name)) {
2644 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2645 meshlink_errno = MESHLINK_EEXIST;
2646 pthread_mutex_unlock(&mesh->mutex);
2650 // Get the local address
2651 char *address = get_my_hostname(mesh, flags);
2654 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2655 meshlink_errno = MESHLINK_ERESOLV;
2656 pthread_mutex_unlock(&mesh->mutex);
2660 if(!refresh_invitation_key(mesh)) {
2661 meshlink_errno = MESHLINK_EINTERNAL;
2662 pthread_mutex_unlock(&mesh->mutex);
2666 // If we changed our own host config file, write it out now
2667 if(mesh->self->status.dirty) {
2668 if(!node_write_config(mesh, mesh->self)) {
2669 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2670 pthread_mutex_unlock(&mesh->mutex);
2677 // Create a hash of the key.
2678 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2679 sha512(fingerprint, strlen(fingerprint), hash);
2680 b64encode_urlsafe(hash, hash, 18);
2682 // Create a random cookie for this invitation.
2684 randomize(cookie, 18);
2686 // Create a filename that doesn't reveal the cookie itself
2687 char buf[18 + strlen(fingerprint)];
2688 char cookiehash[64];
2689 memcpy(buf, cookie, 18);
2690 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2691 sha512(buf, sizeof(buf), cookiehash);
2692 b64encode_urlsafe(cookiehash, cookiehash, 18);
2694 b64encode_urlsafe(cookie, cookie, 18);
2698 /* Construct the invitation file */
2699 uint8_t outbuf[4096];
2700 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2702 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2703 packmsg_add_str(&inv, name);
2704 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2705 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2707 /* TODO: Add several host config files to bootstrap connections.
2708 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2709 * and are not blacklisted.
2711 config_t configs[5];
2712 memset(configs, 0, sizeof(configs));
2715 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2719 /* Append host config files to the invitation file */
2720 packmsg_add_array(&inv, count);
2722 for(int i = 0; i < count; i++) {
2723 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2724 config_free(&configs[i]);
2727 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2729 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2730 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2731 meshlink_errno = MESHLINK_ESTORAGE;
2732 pthread_mutex_unlock(&mesh->mutex);
2736 // Create an URL from the local address, key hash and cookie
2738 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2741 pthread_mutex_unlock(&mesh->mutex);
2745 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2746 return meshlink_invite_ex(mesh, submesh, name, 0);
2749 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2750 if(!mesh || !invitation) {
2751 meshlink_errno = MESHLINK_EINVAL;
2755 join_state_t state = {
2760 ecdsa_t *key = NULL;
2761 ecdsa_t *hiskey = NULL;
2763 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2764 char copy[strlen(invitation) + 1];
2766 pthread_mutex_lock(&mesh->mutex);
2768 //Before doing meshlink_join make sure we are not connected to another mesh
2769 if(mesh->threadstarted) {
2770 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2771 meshlink_errno = MESHLINK_EINVAL;
2775 // 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.
2776 if(mesh->nodes->count > 1) {
2777 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2778 meshlink_errno = MESHLINK_EINVAL;
2782 strcpy(copy, invitation);
2784 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2786 char *slash = strchr(copy, '/');
2794 if(strlen(slash) != 48) {
2798 char *address = copy;
2801 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2805 if(mesh->inviter_commits_first) {
2806 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2809 // Generate a throw-away key for the invitation.
2810 key = ecdsa_generate();
2813 meshlink_errno = MESHLINK_EINTERNAL;
2817 char *b64key = ecdsa_get_base64_public_key(key);
2820 while(address && *address) {
2821 // We allow commas in the address part to support multiple addresses in one invitation URL.
2822 comma = strchr(address, ',');
2828 // Split of the port
2829 port = strrchr(address, ':');
2837 // IPv6 address are enclosed in brackets, per RFC 3986
2838 if(*address == '[') {
2840 char *bracket = strchr(address, ']');
2853 // Connect to the meshlink daemon mentioned in the URL.
2854 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2857 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2858 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2860 if(state.sock == -1) {
2861 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2862 meshlink_errno = MESHLINK_ENETWORK;
2866 set_timeout(state.sock, 5000);
2868 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2869 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2870 meshlink_errno = MESHLINK_ENETWORK;
2871 closesocket(state.sock);
2881 meshlink_errno = MESHLINK_ERESOLV;
2884 if(state.sock != -1 || !comma) {
2891 if(state.sock == -1) {
2895 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2897 // Tell him we have an invitation, and give him our throw-away key.
2901 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2902 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2903 meshlink_errno = MESHLINK_ENETWORK;
2909 char hisname[4096] = "";
2910 int code, hismajor, hisminor = 0;
2912 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) {
2913 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2914 meshlink_errno = MESHLINK_ENETWORK;
2918 // Check if the hash of the key he gave us matches the hash in the URL.
2919 char *fingerprint = state.line + 2;
2922 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2923 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2924 meshlink_errno = MESHLINK_EINTERNAL;
2928 if(memcmp(hishash, state.hash, 18)) {
2929 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2930 meshlink_errno = MESHLINK_EPEER;
2934 hiskey = ecdsa_set_base64_public_key(fingerprint);
2937 meshlink_errno = MESHLINK_EINTERNAL;
2941 // Start an SPTPS session
2942 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2943 meshlink_errno = MESHLINK_EINTERNAL;
2947 // Feed rest of input buffer to SPTPS
2948 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2949 meshlink_errno = MESHLINK_EPEER;
2954 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2956 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2958 if(errno == EINTR) {
2962 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2963 meshlink_errno = MESHLINK_ENETWORK;
2967 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2968 meshlink_errno = MESHLINK_EPEER;
2973 if(!state.success) {
2974 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2975 meshlink_errno = MESHLINK_EPEER;
2979 sptps_stop(&state.sptps);
2982 closesocket(state.sock);
2984 pthread_mutex_unlock(&mesh->mutex);
2988 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2989 meshlink_errno = MESHLINK_EINVAL;
2991 sptps_stop(&state.sptps);
2995 if(state.sock != -1) {
2996 closesocket(state.sock);
2999 pthread_mutex_unlock(&mesh->mutex);
3003 char *meshlink_export(meshlink_handle_t *mesh) {
3005 meshlink_errno = MESHLINK_EINVAL;
3009 // Create a config file on the fly.
3012 packmsg_output_t out = {buf, sizeof(buf)};
3013 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3014 packmsg_add_str(&out, mesh->name);
3015 packmsg_add_str(&out, CORE_MESH);
3017 pthread_mutex_lock(&mesh->mutex);
3019 packmsg_add_int32(&out, mesh->self->devclass);
3020 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3021 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3022 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3026 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3027 if(mesh->self->recent[i].sa.sa_family) {
3034 packmsg_add_array(&out, count);
3036 for(uint32_t i = 0; i < count; i++) {
3037 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3040 packmsg_add_int64(&out, 0);
3041 packmsg_add_int64(&out, 0);
3043 pthread_mutex_unlock(&mesh->mutex);
3045 if(!packmsg_output_ok(&out)) {
3046 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3047 meshlink_errno = MESHLINK_EINTERNAL;
3051 // Prepare a base64-encoded packmsg array containing our config file
3053 uint32_t len = packmsg_output_size(&out, buf);
3054 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3055 uint8_t *buf2 = xmalloc(len2);
3056 packmsg_output_t out2 = {buf2, len2};
3057 packmsg_add_array(&out2, 1);
3058 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3060 if(!packmsg_output_ok(&out2)) {
3061 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3062 meshlink_errno = MESHLINK_EINTERNAL;
3067 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3069 return (char *)buf2;
3072 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3073 if(!mesh || !data) {
3074 meshlink_errno = MESHLINK_EINVAL;
3078 size_t datalen = strlen(data);
3079 uint8_t *buf = xmalloc(datalen);
3080 int buflen = b64decode(data, buf, datalen);
3083 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3084 meshlink_errno = MESHLINK_EPEER;
3088 packmsg_input_t in = {buf, buflen};
3089 uint32_t count = packmsg_get_array(&in);
3092 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3093 meshlink_errno = MESHLINK_EPEER;
3097 pthread_mutex_lock(&mesh->mutex);
3101 uint32_t len = packmsg_get_bin_raw(&in, &data);
3107 packmsg_input_t in2 = {data, len};
3108 uint32_t version = packmsg_get_uint32(&in2);
3109 char *name = packmsg_get_str_dup(&in2);
3111 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3113 packmsg_input_invalidate(&in);
3117 if(!check_id(name)) {
3122 node_t *n = lookup_node(mesh, name);
3125 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3133 config_t config = {data, len};
3135 if(!node_read_from_config(mesh, n, &config)) {
3137 packmsg_input_invalidate(&in);
3141 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3142 n->last_reachable = 0;
3143 n->last_unreachable = 0;
3145 if(!node_write_config(mesh, n)) {
3153 pthread_mutex_unlock(&mesh->mutex);
3157 if(!packmsg_done(&in)) {
3158 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3159 meshlink_errno = MESHLINK_EPEER;
3163 if(!config_sync(mesh, "current")) {
3170 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3171 if(n == mesh->self) {
3172 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3173 meshlink_errno = MESHLINK_EINVAL;
3177 if(n->status.blacklisted) {
3178 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3182 n->status.blacklisted = true;
3184 /* Immediately shut down any connections we have with the blacklisted node.
3185 * We can't call terminate_connection(), because we might be called from a callback function.
3187 for list_each(connection_t, c, mesh->connections) {
3189 shutdown(c->socket, SHUT_RDWR);
3193 utcp_abort_all_connections(n->utcp);
3199 n->status.udp_confirmed = false;
3201 if(n->status.reachable) {
3202 n->last_unreachable = mesh->loop.now.tv_sec;
3205 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3206 * manually call the status callback if necessary.
3208 if(n->status.reachable && mesh->node_status_cb) {
3209 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3212 return node_write_config(mesh, n) && config_sync(mesh, "current");
3215 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3216 if(!mesh || !node) {
3217 meshlink_errno = MESHLINK_EINVAL;
3221 pthread_mutex_lock(&mesh->mutex);
3223 if(!blacklist(mesh, (node_t *)node)) {
3224 pthread_mutex_unlock(&mesh->mutex);
3228 pthread_mutex_unlock(&mesh->mutex);
3230 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3234 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3235 if(!mesh || !name) {
3236 meshlink_errno = MESHLINK_EINVAL;
3240 pthread_mutex_lock(&mesh->mutex);
3242 node_t *n = lookup_node(mesh, (char *)name);
3246 n->name = xstrdup(name);
3250 if(!blacklist(mesh, (node_t *)n)) {
3251 pthread_mutex_unlock(&mesh->mutex);
3255 pthread_mutex_unlock(&mesh->mutex);
3257 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3261 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3262 if(n == mesh->self) {
3263 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3264 meshlink_errno = MESHLINK_EINVAL;
3268 if(!n->status.blacklisted) {
3269 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3273 n->status.blacklisted = false;
3275 if(n->status.reachable) {
3276 n->last_reachable = mesh->loop.now.tv_sec;
3277 update_node_status(mesh, n);
3280 return node_write_config(mesh, n) && config_sync(mesh, "current");
3283 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3284 if(!mesh || !node) {
3285 meshlink_errno = MESHLINK_EINVAL;
3289 pthread_mutex_lock(&mesh->mutex);
3291 if(!whitelist(mesh, (node_t *)node)) {
3292 pthread_mutex_unlock(&mesh->mutex);
3296 pthread_mutex_unlock(&mesh->mutex);
3298 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3302 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3303 if(!mesh || !name) {
3304 meshlink_errno = MESHLINK_EINVAL;
3308 pthread_mutex_lock(&mesh->mutex);
3310 node_t *n = lookup_node(mesh, (char *)name);
3314 n->name = xstrdup(name);
3318 if(!whitelist(mesh, (node_t *)n)) {
3319 pthread_mutex_unlock(&mesh->mutex);
3323 pthread_mutex_unlock(&mesh->mutex);
3325 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3329 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3330 mesh->default_blacklist = blacklist;
3333 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3334 if(!mesh || !node) {
3335 meshlink_errno = MESHLINK_EINVAL;
3339 node_t *n = (node_t *)node;
3341 pthread_mutex_lock(&mesh->mutex);
3343 /* Check that the node is not reachable */
3344 if(n->status.reachable || n->connection) {
3345 pthread_mutex_unlock(&mesh->mutex);
3346 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3350 /* Check that we don't have any active UTCP connections */
3351 if(n->utcp && utcp_is_active(n->utcp)) {
3352 pthread_mutex_unlock(&mesh->mutex);
3353 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3357 /* Check that we have no active connections to this node */
3358 for list_each(connection_t, c, mesh->connections) {
3360 pthread_mutex_unlock(&mesh->mutex);
3361 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3366 /* Remove any pending outgoings to this node */
3367 if(mesh->outgoings) {
3368 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3369 if(outgoing->node == n) {
3370 list_delete_node(mesh->outgoings, node);
3375 /* Delete the config file for this node */
3376 if(!config_delete(mesh, "current", n->name)) {
3377 pthread_mutex_unlock(&mesh->mutex);
3381 /* Delete the node struct and any remaining edges referencing this node */
3384 pthread_mutex_unlock(&mesh->mutex);
3386 return config_sync(mesh, "current");
3389 /* Hint that a hostname may be found at an address
3390 * See header file for detailed comment.
3392 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3393 if(!mesh || !node || !addr) {
3394 meshlink_errno = EINVAL;
3398 pthread_mutex_lock(&mesh->mutex);
3400 node_t *n = (node_t *)node;
3402 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3403 if(!node_write_config(mesh, n)) {
3404 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3408 pthread_mutex_unlock(&mesh->mutex);
3409 // @TODO do we want to fire off a connection attempt right away?
3412 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3414 node_t *n = utcp->priv;
3415 meshlink_handle_t *mesh = n->mesh;
3416 return mesh->channel_accept_cb;
3419 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3421 if(aio->cb.buffer) {
3422 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3426 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3431 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3432 meshlink_channel_t *channel = connection->priv;
3438 node_t *n = channel->node;
3439 meshlink_handle_t *mesh = n->mesh;
3441 if(n->status.destroyed) {
3442 meshlink_channel_close(mesh, channel);
3446 const char *p = data;
3449 while(channel->aio_receive) {
3450 meshlink_aio_buffer_t *aio = channel->aio_receive;
3451 size_t todo = aio->len - aio->done;
3458 memcpy((char *)aio->data + aio->done, p, todo);
3460 ssize_t result = write(aio->fd, p, todo);
3469 if(aio->done == aio->len) {
3470 channel->aio_receive = aio->next;
3471 aio_signal(mesh, channel, aio);
3483 if(channel->receive_cb) {
3484 channel->receive_cb(mesh, channel, p, left);
3490 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3491 node_t *n = utcp_connection->utcp->priv;
3497 meshlink_handle_t *mesh = n->mesh;
3499 if(!mesh->channel_accept_cb) {
3503 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3505 channel->c = utcp_connection;
3507 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3508 utcp_accept(utcp_connection, channel_recv, channel);
3514 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3515 node_t *n = utcp->priv;
3517 if(n->status.destroyed) {
3521 meshlink_handle_t *mesh = n->mesh;
3522 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3525 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3526 if(!mesh || !channel) {
3527 meshlink_errno = MESHLINK_EINVAL;
3531 channel->receive_cb = cb;
3534 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3536 node_t *n = (node_t *)source;
3542 utcp_recv(n->utcp, data, len);
3545 static void channel_poll(struct utcp_connection *connection, size_t len) {
3546 meshlink_channel_t *channel = connection->priv;
3552 node_t *n = channel->node;
3553 meshlink_handle_t *mesh = n->mesh;
3554 meshlink_aio_buffer_t *aio = channel->aio_send;
3557 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3558 size_t left = aio->len - aio->done;
3566 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3569 size_t todo = utcp_get_sndbuf_free(connection);
3575 if(todo > sizeof(buf)) {
3579 ssize_t result = read(aio->fd, buf, todo);
3582 sent = utcp_send(connection, buf, result);
3592 /* If the buffer is now completely sent, call the callback and dispose of it. */
3593 if(aio->done >= aio->len) {
3594 channel->aio_send = aio->next;
3595 aio_signal(mesh, channel, aio);
3599 if(channel->poll_cb) {
3600 channel->poll_cb(mesh, channel, len);
3602 utcp_set_poll_cb(connection, NULL);
3607 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3608 if(!mesh || !channel) {
3609 meshlink_errno = MESHLINK_EINVAL;
3613 pthread_mutex_lock(&mesh->mutex);
3614 channel->poll_cb = cb;
3615 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3616 pthread_mutex_unlock(&mesh->mutex);
3619 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3621 meshlink_errno = MESHLINK_EINVAL;
3625 pthread_mutex_lock(&mesh->mutex);
3626 mesh->channel_accept_cb = cb;
3627 mesh->receive_cb = channel_receive;
3629 for splay_each(node_t, n, mesh->nodes) {
3630 if(!n->utcp && n != mesh->self) {
3631 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3635 pthread_mutex_unlock(&mesh->mutex);
3638 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3642 meshlink_errno = MESHLINK_EINVAL;
3646 pthread_mutex_lock(&mesh->mutex);
3647 utcp_set_sndbuf(channel->c, size);
3648 pthread_mutex_unlock(&mesh->mutex);
3651 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3655 meshlink_errno = MESHLINK_EINVAL;
3659 pthread_mutex_lock(&mesh->mutex);
3660 utcp_set_rcvbuf(channel->c, size);
3661 pthread_mutex_unlock(&mesh->mutex);
3664 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) {
3666 abort(); // TODO: handle non-NULL data
3669 if(!mesh || !node) {
3670 meshlink_errno = MESHLINK_EINVAL;
3674 pthread_mutex_lock(&mesh->mutex);
3676 node_t *n = (node_t *)node;
3679 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3680 mesh->receive_cb = channel_receive;
3683 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3684 pthread_mutex_unlock(&mesh->mutex);
3689 if(n->status.blacklisted) {
3690 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3691 meshlink_errno = MESHLINK_EBLACKLISTED;
3692 pthread_mutex_unlock(&mesh->mutex);
3696 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3698 channel->receive_cb = cb;
3701 channel->priv = (void *)data;
3704 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3706 pthread_mutex_unlock(&mesh->mutex);
3709 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3717 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) {
3718 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3721 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3722 if(!mesh || !channel) {
3723 meshlink_errno = MESHLINK_EINVAL;
3727 pthread_mutex_lock(&mesh->mutex);
3728 utcp_shutdown(channel->c, direction);
3729 pthread_mutex_unlock(&mesh->mutex);
3732 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3733 if(!mesh || !channel) {
3734 meshlink_errno = MESHLINK_EINVAL;
3738 pthread_mutex_lock(&mesh->mutex);
3740 utcp_close(channel->c);
3742 /* Clean up any outstanding AIO buffers. */
3743 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3745 aio_signal(mesh, channel, aio);
3749 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3751 aio_signal(mesh, channel, aio);
3755 pthread_mutex_unlock(&mesh->mutex);
3760 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3761 if(!mesh || !channel) {
3762 meshlink_errno = MESHLINK_EINVAL;
3771 meshlink_errno = MESHLINK_EINVAL;
3775 // TODO: more finegrained locking.
3776 // Ideally we want to put the data into the UTCP connection's send buffer.
3777 // Then, preferably only if there is room in the receiver window,
3778 // kick the meshlink thread to go send packets.
3782 pthread_mutex_lock(&mesh->mutex);
3784 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3785 if(channel->aio_send) {
3788 retval = utcp_send(channel->c, data, len);
3791 pthread_mutex_unlock(&mesh->mutex);
3794 meshlink_errno = MESHLINK_ENETWORK;
3800 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) {
3801 if(!mesh || !channel) {
3802 meshlink_errno = MESHLINK_EINVAL;
3807 meshlink_errno = MESHLINK_EINVAL;
3811 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3814 aio->cb.buffer = cb;
3817 pthread_mutex_lock(&mesh->mutex);
3819 /* Append the AIO buffer descriptor to the end of the chain */
3820 meshlink_aio_buffer_t **p = &channel->aio_send;
3828 /* Ensure the poll callback is set, and call it right now to push data if possible */
3829 utcp_set_poll_cb(channel->c, channel_poll);
3830 channel_poll(channel->c, len);
3832 pthread_mutex_unlock(&mesh->mutex);
3837 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) {
3838 if(!mesh || !channel) {
3839 meshlink_errno = MESHLINK_EINVAL;
3843 if(!len || fd == -1) {
3844 meshlink_errno = MESHLINK_EINVAL;
3848 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3854 pthread_mutex_lock(&mesh->mutex);
3856 /* Append the AIO buffer descriptor to the end of the chain */
3857 meshlink_aio_buffer_t **p = &channel->aio_send;
3865 /* Ensure the poll callback is set, and call it right now to push data if possible */
3866 utcp_set_poll_cb(channel->c, channel_poll);
3867 channel_poll(channel->c, len);
3869 pthread_mutex_unlock(&mesh->mutex);
3874 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) {
3875 if(!mesh || !channel) {
3876 meshlink_errno = MESHLINK_EINVAL;
3881 meshlink_errno = MESHLINK_EINVAL;
3885 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3888 aio->cb.buffer = cb;
3891 pthread_mutex_lock(&mesh->mutex);
3893 /* Append the AIO buffer descriptor to the end of the chain */
3894 meshlink_aio_buffer_t **p = &channel->aio_receive;
3902 pthread_mutex_unlock(&mesh->mutex);
3907 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) {
3908 if(!mesh || !channel) {
3909 meshlink_errno = MESHLINK_EINVAL;
3913 if(!len || fd == -1) {
3914 meshlink_errno = MESHLINK_EINVAL;
3918 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3924 pthread_mutex_lock(&mesh->mutex);
3926 /* Append the AIO buffer descriptor to the end of the chain */
3927 meshlink_aio_buffer_t **p = &channel->aio_receive;
3935 pthread_mutex_unlock(&mesh->mutex);
3940 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3941 if(!mesh || !channel) {
3942 meshlink_errno = MESHLINK_EINVAL;
3946 return channel->c->flags;
3949 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3950 if(!mesh || !channel) {
3951 meshlink_errno = MESHLINK_EINVAL;
3955 return utcp_get_sendq(channel->c);
3958 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3959 if(!mesh || !channel) {
3960 meshlink_errno = MESHLINK_EINVAL;
3964 return utcp_get_recvq(channel->c);
3967 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3968 if(!mesh || !node) {
3969 meshlink_errno = MESHLINK_EINVAL;
3973 node_t *n = (node_t *)node;
3975 pthread_mutex_lock(&mesh->mutex);
3978 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3981 utcp_set_user_timeout(n->utcp, timeout);
3983 pthread_mutex_unlock(&mesh->mutex);
3986 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3987 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3988 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3991 if(mesh->node_status_cb) {
3992 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3995 if(mesh->node_pmtu_cb) {
3996 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4000 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4001 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4002 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4006 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4007 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4011 n->status.duplicate = true;
4012 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4015 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4019 meshlink_errno = MESHLINK_EINVAL;
4023 pthread_mutex_lock(&mesh->mutex);
4025 if(mesh->discovery == enable) {
4029 if(mesh->threadstarted) {
4031 discovery_start(mesh);
4033 discovery_stop(mesh);
4037 mesh->discovery = enable;
4040 pthread_mutex_unlock(&mesh->mutex);
4044 meshlink_errno = MESHLINK_ENOTSUP;
4048 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4049 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4050 meshlink_errno = EINVAL;
4054 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4055 meshlink_errno = EINVAL;
4059 pthread_mutex_lock(&mesh->mutex);
4060 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4061 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4062 pthread_mutex_unlock(&mesh->mutex);
4065 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4066 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4067 meshlink_errno = EINVAL;
4071 if(fast_retry_period < 0) {
4072 meshlink_errno = EINVAL;
4076 pthread_mutex_lock(&mesh->mutex);
4077 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4078 pthread_mutex_unlock(&mesh->mutex);
4081 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4083 meshlink_errno = EINVAL;
4087 pthread_mutex_lock(&mesh->mutex);
4088 mesh->inviter_commits_first = inviter_commits_first;
4089 pthread_mutex_unlock(&mesh->mutex);
4092 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4094 meshlink_errno = EINVAL;
4098 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4099 meshlink_errno = EINVAL;
4103 pthread_mutex_lock(&mesh->mutex);
4104 free(mesh->external_address_url);
4105 mesh->external_address_url = url ? xstrdup(url) : NULL;
4106 pthread_mutex_unlock(&mesh->mutex);
4109 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4112 if(!mesh->connections || !mesh->loop.running) {
4119 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
4120 // We should only call the callback function if we are in the background thread.
4121 if(!mesh->error_cb) {
4125 if(!mesh->threadstarted) {
4129 if(mesh->thread == pthread_self()) {
4130 mesh->error_cb(mesh, meshlink_errno);
4134 static void __attribute__((constructor)) meshlink_init(void) {
4138 static void __attribute__((destructor)) meshlink_exit(void) {