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 char *hostname = NULL;
226 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
227 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
228 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
231 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
232 if(family != AF_UNSPEC && aip->ai_family != family) {
236 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
239 set_timeout(s, 5000);
241 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
248 send(s, request, sizeof(request) - 1, 0);
249 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
254 if(line[len - 1] == '\n') {
258 char *p = strrchr(line, '\n');
261 hostname = xstrdup(p + 1);
277 // Check that the hostname is reasonable
278 if(hostname && !is_valid_hostname(hostname)) {
284 meshlink_errno = MESHLINK_ERESOLV;
290 static bool is_localaddr(sockaddr_t *sa) {
291 switch(sa->sa.sa_family) {
293 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
296 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
297 return first == 0 || (first & 0xffc0) == 0xfe80;
305 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
308 // Determine address of the local interface used for outgoing connections.
309 char localaddr[NI_MAXHOST];
310 bool success = false;
312 if(family == AF_INET) {
313 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
314 } else if(family == AF_INET6) {
315 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
318 #ifdef HAVE_GETIFADDRS
321 struct ifaddrs *ifa = NULL;
324 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
325 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
327 if(sa->sa.sa_family != family) {
331 if(is_localaddr(sa)) {
335 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
347 meshlink_errno = MESHLINK_ENETWORK;
351 return xstrdup(localaddr);
354 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
355 for(int i = 0; i < n; i++) {
360 // Ignore duplicate hostnames
363 for(int j = 0; j < i; j++) {
368 if(strcmp(host[i], host[j])) {
372 if(strcmp(port[i], port[j])) {
380 if(found || !is_valid_hostname(host[i])) {
390 // This gets the hostname part for use in invitation URLs
391 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
392 char *hostname[4] = {NULL};
393 char *port[4] = {NULL};
394 char *hostport = NULL;
396 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
397 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
400 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
401 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
404 // Add local addresses if requested
405 if(flags & MESHLINK_INVITE_LOCAL) {
406 if(flags & MESHLINK_INVITE_IPV4) {
407 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
410 if(flags & MESHLINK_INVITE_IPV6) {
411 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
415 // Add public/canonical addresses if requested
416 if(flags & MESHLINK_INVITE_PUBLIC) {
417 // Try the CanonicalAddress first
418 get_canonical_address(mesh->self, &hostname[2], &port[2]);
421 if(flags & MESHLINK_INVITE_IPV4) {
422 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
425 if(flags & MESHLINK_INVITE_IPV6) {
426 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
431 for(int i = 0; i < 4; i++) {
432 // Ensure we always have a port number
433 if(hostname[i] && !port[i]) {
434 port[i] = xstrdup(mesh->myport);
438 remove_duplicate_hostnames(hostname, port, 4);
440 // Resolve the hostnames
441 for(int i = 0; i < 4; i++) {
446 // Convert what we have to a sockaddr
447 struct addrinfo *ai_in, *ai_out;
448 struct addrinfo hint = {
449 .ai_family = AF_UNSPEC,
450 .ai_flags = AI_NUMERICSERV,
451 .ai_socktype = SOCK_STREAM,
453 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
459 // Remember the address
460 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)ai_in->ai_addr);
462 if(flags & MESHLINK_INVITE_NUMERIC) {
463 // We don't need to do any further conversion
468 // Convert it to a hostname
469 char resolved_host[NI_MAXHOST];
470 char resolved_port[NI_MAXSERV];
471 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
473 if(err || !is_valid_hostname(resolved_host)) {
478 // Convert the hostname back to a sockaddr
479 hint.ai_family = ai_in->ai_family;
480 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
487 // Check if it's still the same sockaddr
488 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
490 freeaddrinfo(ai_out);
494 // Yes: replace the hostname with the resolved one
496 hostname[i] = xstrdup(resolved_host);
499 freeaddrinfo(ai_out);
502 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
503 remove_duplicate_hostnames(hostname, port, 4);
505 // Concatenate all unique address to the hostport string
506 for(int i = 0; i < 4; i++) {
511 // Append the address to the hostport string
513 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
515 hostport = newhostport;
524 static bool try_bind(int port) {
525 struct addrinfo *ai = NULL;
526 struct addrinfo hint = {
527 .ai_flags = AI_PASSIVE,
528 .ai_family = AF_UNSPEC,
529 .ai_socktype = SOCK_STREAM,
530 .ai_protocol = IPPROTO_TCP,
534 snprintf(portstr, sizeof(portstr), "%d", port);
536 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
541 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
542 int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
549 int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
562 static int check_port(meshlink_handle_t *mesh) {
563 for(int i = 0; i < 1000; i++) {
564 int port = 0x1000 + prng(mesh, 0x8000);
568 xasprintf(&mesh->myport, "%d", port);
573 meshlink_errno = MESHLINK_ENETWORK;
574 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
578 static bool write_main_config_files(meshlink_handle_t *mesh) {
579 if(!mesh->confbase) {
585 /* Write the main config file */
586 packmsg_output_t out = {buf, sizeof buf};
588 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
589 packmsg_add_str(&out, mesh->name);
590 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
591 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
592 packmsg_add_uint16(&out, atoi(mesh->myport));
594 if(!packmsg_output_ok(&out)) {
598 config_t config = {buf, packmsg_output_size(&out, buf)};
600 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
604 /* Write our own host config file */
605 if(!node_write_config(mesh, mesh->self)) {
613 meshlink_handle_t *mesh;
615 char cookie[18 + 32];
626 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
627 meshlink_handle_t *mesh = state->mesh;
628 packmsg_input_t in = {buf, len};
629 uint32_t version = packmsg_get_uint32(&in);
631 if(version != MESHLINK_INVITATION_VERSION) {
632 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
636 char *name = packmsg_get_str_dup(&in);
637 packmsg_skip_element(&in); /* submesh */
638 dev_class_t devclass = packmsg_get_int32(&in);
639 uint32_t count = packmsg_get_array(&in);
642 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
646 if(!check_id(name)) {
647 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
653 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
659 free(mesh->self->name);
661 mesh->self->name = xstrdup(name);
662 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
664 // Initialize configuration directory
665 if(!config_init(mesh, "current")) {
669 if(!write_main_config_files(mesh)) {
673 // Write host config files
674 for(uint32_t i = 0; i < count; i++) {
676 uint32_t len = packmsg_get_bin_raw(&in, &data);
679 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
683 packmsg_input_t in2 = {data, len};
684 uint32_t version = packmsg_get_uint32(&in2);
685 char *name = packmsg_get_str_dup(&in2);
687 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
689 packmsg_input_invalidate(&in);
693 if(!check_id(name)) {
698 if(!strcmp(name, mesh->name)) {
699 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
701 meshlink_errno = MESHLINK_EPEER;
705 node_t *n = new_node();
708 config_t config = {data, len};
710 if(!node_read_from_config(mesh, n, &config)) {
712 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
713 meshlink_errno = MESHLINK_EPEER;
718 /* The first host config file is of the inviter itself;
719 * remember the address we are currently using for the invitation connection.
722 socklen_t salen = sizeof(sa);
724 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
725 node_add_recent_address(mesh, n, &sa);
729 /* Clear the reachability times, since we ourself have never seen these nodes yet */
730 n->last_reachable = 0;
731 n->last_unreachable = 0;
733 if(!node_write_config(mesh, n)) {
741 /* Ensure the configuration directory metadata is on disk */
742 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
746 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
748 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
753 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
755 join_state_t *state = handle;
756 const char *ptr = data;
759 int result = send(state->sock, ptr, len, 0);
761 if(result == -1 && errno == EINTR) {
763 } else if(result <= 0) {
774 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
775 join_state_t *state = handle;
776 meshlink_handle_t *mesh = state->mesh;
778 if(mesh->inviter_commits_first) {
780 case SPTPS_HANDSHAKE:
781 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
787 if(!finalize_join(state, msg, len)) {
791 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
792 shutdown(state->sock, SHUT_RDWR);
793 state->success = true;
801 case SPTPS_HANDSHAKE:
802 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
805 return finalize_join(state, msg, len);
808 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
809 shutdown(state->sock, SHUT_RDWR);
810 state->success = true;
821 static bool recvline(join_state_t *state) {
822 char *newline = NULL;
824 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
825 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
827 if(result == -1 && errno == EINTR) {
829 } else if(result <= 0) {
833 state->blen += result;
836 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
840 size_t len = newline - state->buffer;
842 memcpy(state->line, state->buffer, len);
843 state->line[len] = 0;
844 memmove(state->buffer, newline + 1, state->blen - len - 1);
845 state->blen -= len + 1;
850 static bool sendline(int fd, char *format, ...) {
856 va_start(ap, format);
857 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
860 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
868 int result = send(fd, p, blen, MSG_NOSIGNAL);
870 if(result == -1 && errno == EINTR) {
872 } else if(result <= 0) {
883 static const char *errstr[] = {
884 [MESHLINK_OK] = "No error",
885 [MESHLINK_EINVAL] = "Invalid argument",
886 [MESHLINK_ENOMEM] = "Out of memory",
887 [MESHLINK_ENOENT] = "No such node",
888 [MESHLINK_EEXIST] = "Node already exists",
889 [MESHLINK_EINTERNAL] = "Internal error",
890 [MESHLINK_ERESOLV] = "Could not resolve hostname",
891 [MESHLINK_ESTORAGE] = "Storage error",
892 [MESHLINK_ENETWORK] = "Network error",
893 [MESHLINK_EPEER] = "Error communicating with peer",
894 [MESHLINK_ENOTSUP] = "Operation not supported",
895 [MESHLINK_EBUSY] = "MeshLink instance already in use",
896 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
899 const char *meshlink_strerror(meshlink_errno_t err) {
900 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
901 return "Invalid error code";
907 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
908 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
910 mesh->private_key = ecdsa_generate();
911 mesh->invitation_key = ecdsa_generate();
913 if(!mesh->private_key || !mesh->invitation_key) {
914 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
915 meshlink_errno = MESHLINK_EINTERNAL;
919 logger(mesh, MESHLINK_DEBUG, "Done.\n");
924 static struct timeval idle(event_loop_t *loop, void *data) {
926 meshlink_handle_t *mesh = data;
927 struct timeval t, tmin = {3600, 0};
929 for splay_each(node_t, n, mesh->nodes) {
934 t = utcp_timeout(n->utcp);
936 if(timercmp(&t, &tmin, <)) {
944 // Get our local address(es) by simulating connecting to an Internet host.
945 static void add_local_addresses(meshlink_handle_t *mesh) {
947 sa.storage.ss_family = AF_UNKNOWN;
948 socklen_t salen = sizeof(sa);
952 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
953 sa.in.sin_port = ntohs(atoi(mesh->myport));
954 node_add_recent_address(mesh, mesh->self, &sa);
961 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
962 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
963 node_add_recent_address(mesh, mesh->self, &sa);
967 static bool meshlink_setup(meshlink_handle_t *mesh) {
968 if(!config_destroy(mesh->confbase, "new")) {
969 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
970 meshlink_errno = MESHLINK_ESTORAGE;
974 if(!config_destroy(mesh->confbase, "old")) {
975 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
976 meshlink_errno = MESHLINK_ESTORAGE;
980 if(!config_init(mesh, "current")) {
981 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
982 meshlink_errno = MESHLINK_ESTORAGE;
986 if(!ecdsa_keygen(mesh)) {
987 meshlink_errno = MESHLINK_EINTERNAL;
991 if(check_port(mesh) == 0) {
992 meshlink_errno = MESHLINK_ENETWORK;
996 /* Create a node for ourself */
998 mesh->self = new_node();
999 mesh->self->name = xstrdup(mesh->name);
1000 mesh->self->devclass = mesh->devclass;
1001 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1002 mesh->self->session_id = mesh->session_id;
1004 if(!write_main_config_files(mesh)) {
1005 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1006 meshlink_errno = MESHLINK_ESTORAGE;
1010 /* Ensure the configuration directory metadata is on disk */
1011 if(!config_sync(mesh, "current")) {
1018 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1021 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1022 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1026 packmsg_input_t in = {config.buf, config.len};
1027 const void *private_key;
1028 const void *invitation_key;
1030 uint32_t version = packmsg_get_uint32(&in);
1031 char *name = packmsg_get_str_dup(&in);
1032 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1033 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1034 uint16_t myport = packmsg_get_uint16(&in);
1036 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1037 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1039 config_free(&config);
1045 // TODO: check this?
1046 if(mesh->name && strcmp(mesh->name, name)) {
1047 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1048 meshlink_errno = MESHLINK_ESTORAGE;
1050 config_free(&config);
1058 xasprintf(&mesh->myport, "%u", myport);
1059 mesh->private_key = ecdsa_set_private_key(private_key);
1060 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1061 config_free(&config);
1063 /* Create a node for ourself and read our host configuration file */
1065 mesh->self = new_node();
1066 mesh->self->name = xstrdup(name);
1067 mesh->self->devclass = mesh->devclass;
1068 mesh->self->session_id = mesh->session_id;
1070 if(!node_read_public_key(mesh, mesh->self)) {
1071 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1072 meshlink_errno = MESHLINK_ESTORAGE;
1073 free_node(mesh->self);
1082 static void *setup_network_in_netns_thread(void *arg) {
1083 meshlink_handle_t *mesh = arg;
1085 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1089 bool success = setup_network(mesh);
1090 add_local_addresses(mesh);
1091 return success ? arg : NULL;
1093 #endif // HAVE_SETNS
1095 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1096 if(!confbase || !*confbase) {
1097 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1098 meshlink_errno = MESHLINK_EINVAL;
1102 if(!appname || !*appname) {
1103 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1104 meshlink_errno = MESHLINK_EINVAL;
1108 if(strchr(appname, ' ')) {
1109 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1110 meshlink_errno = MESHLINK_EINVAL;
1114 if(!name || !*name) {
1115 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1116 meshlink_errno = MESHLINK_EINVAL;
1120 if(!check_id(name)) {
1121 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1122 meshlink_errno = MESHLINK_EINVAL;
1126 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1127 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1128 meshlink_errno = MESHLINK_EINVAL;
1132 meshlink_open_params_t *params = xzalloc(sizeof * params);
1134 params->confbase = xstrdup(confbase);
1135 params->name = xstrdup(name);
1136 params->appname = xstrdup(appname);
1137 params->devclass = devclass;
1143 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1145 meshlink_errno = MESHLINK_EINVAL;
1149 params->netns = netns;
1154 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1156 meshlink_errno = MESHLINK_EINVAL;
1160 if((!key && keylen) || (key && !keylen)) {
1161 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1162 meshlink_errno = MESHLINK_EINVAL;
1167 params->keylen = keylen;
1172 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1173 if(!mesh || !new_key || !new_keylen) {
1174 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1175 meshlink_errno = MESHLINK_EINVAL;
1179 pthread_mutex_lock(&mesh->mutex);
1181 // Create hash for the new key
1182 void *new_config_key;
1183 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1185 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1186 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1187 meshlink_errno = MESHLINK_EINTERNAL;
1188 pthread_mutex_unlock(&mesh->mutex);
1192 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1194 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1195 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1196 meshlink_errno = MESHLINK_ESTORAGE;
1197 pthread_mutex_unlock(&mesh->mutex);
1201 devtool_keyrotate_probe(1);
1203 // Rename confbase/current/ to confbase/old
1205 if(!config_rename(mesh, "current", "old")) {
1206 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1207 meshlink_errno = MESHLINK_ESTORAGE;
1208 pthread_mutex_unlock(&mesh->mutex);
1212 devtool_keyrotate_probe(2);
1214 // Rename confbase/new/ to confbase/current
1216 if(!config_rename(mesh, "new", "current")) {
1217 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1218 meshlink_errno = MESHLINK_ESTORAGE;
1219 pthread_mutex_unlock(&mesh->mutex);
1223 devtool_keyrotate_probe(3);
1225 // Cleanup the "old" confbase sub-directory
1227 if(!config_destroy(mesh->confbase, "old")) {
1228 pthread_mutex_unlock(&mesh->mutex);
1232 // Change the mesh handle key with new key
1234 free(mesh->config_key);
1235 mesh->config_key = new_config_key;
1237 pthread_mutex_unlock(&mesh->mutex);
1242 void meshlink_open_params_free(meshlink_open_params_t *params) {
1244 meshlink_errno = MESHLINK_EINVAL;
1248 free(params->confbase);
1250 free(params->appname);
1255 /// Device class traits
1256 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1257 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1258 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1259 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1260 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1263 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1264 if(!confbase || !*confbase) {
1265 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1266 meshlink_errno = MESHLINK_EINVAL;
1270 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1271 meshlink_open_params_t params;
1272 memset(¶ms, 0, sizeof(params));
1274 params.confbase = (char *)confbase;
1275 params.name = (char *)name;
1276 params.appname = (char *)appname;
1277 params.devclass = devclass;
1280 return meshlink_open_ex(¶ms);
1283 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) {
1284 if(!confbase || !*confbase) {
1285 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1286 meshlink_errno = MESHLINK_EINVAL;
1290 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1291 meshlink_open_params_t params;
1292 memset(¶ms, 0, sizeof(params));
1294 params.confbase = (char *)confbase;
1295 params.name = (char *)name;
1296 params.appname = (char *)appname;
1297 params.devclass = devclass;
1300 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1304 return meshlink_open_ex(¶ms);
1307 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1308 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1309 meshlink_open_params_t params;
1310 memset(¶ms, 0, sizeof(params));
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_ex(const meshlink_open_params_t *params) {
1321 // Validate arguments provided by the application
1322 bool usingname = false;
1324 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1326 if(!params->appname || !*params->appname) {
1327 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1328 meshlink_errno = MESHLINK_EINVAL;
1332 if(strchr(params->appname, ' ')) {
1333 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1334 meshlink_errno = MESHLINK_EINVAL;
1338 if(!params->name || !*params->name) {
1339 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1341 } else { //check name only if there is a name != NULL
1343 if(!check_id(params->name)) {
1344 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1345 meshlink_errno = MESHLINK_EINVAL;
1352 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1353 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1354 meshlink_errno = MESHLINK_EINVAL;
1358 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1359 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1360 meshlink_errno = MESHLINK_EINVAL;
1364 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1366 if(params->confbase) {
1367 mesh->confbase = xstrdup(params->confbase);
1370 mesh->appname = xstrdup(params->appname);
1371 mesh->devclass = params->devclass;
1372 mesh->discovery = true;
1373 mesh->invitation_timeout = 604800; // 1 week
1374 mesh->netns = params->netns;
1375 mesh->submeshes = NULL;
1376 mesh->log_cb = global_log_cb;
1377 mesh->log_level = global_log_level;
1379 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1382 randomize(&mesh->session_id, sizeof(mesh->session_id));
1383 } while(mesh->session_id == 0);
1385 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1388 mesh->name = xstrdup(params->name);
1393 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1395 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1396 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1397 meshlink_close(mesh);
1398 meshlink_errno = MESHLINK_EINTERNAL;
1404 pthread_mutexattr_t attr;
1405 pthread_mutexattr_init(&attr);
1406 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1407 pthread_mutex_init(&mesh->mutex, &attr);
1409 mesh->threadstarted = false;
1410 event_loop_init(&mesh->loop);
1411 mesh->loop.data = mesh;
1413 meshlink_queue_init(&mesh->outpacketqueue);
1415 // Atomically lock the configuration directory.
1416 if(!main_config_lock(mesh)) {
1417 meshlink_close(mesh);
1421 // If no configuration exists yet, create it.
1423 if(!meshlink_confbase_exists(mesh)) {
1424 if(!meshlink_setup(mesh)) {
1425 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1426 meshlink_close(mesh);
1430 if(!meshlink_read_config(mesh)) {
1431 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1432 meshlink_close(mesh);
1438 struct WSAData wsa_state;
1439 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1442 // Setup up everything
1443 // TODO: we should not open listening sockets yet
1445 bool success = false;
1447 if(mesh->netns != -1) {
1451 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1452 void *retval = NULL;
1453 success = pthread_join(thr, &retval) == 0 && retval;
1457 meshlink_errno = MESHLINK_EINTERNAL;
1460 #endif // HAVE_SETNS
1462 success = setup_network(mesh);
1463 add_local_addresses(mesh);
1467 meshlink_close(mesh);
1468 meshlink_errno = MESHLINK_ENETWORK;
1472 add_local_addresses(mesh);
1474 if(!node_write_config(mesh, mesh->self)) {
1475 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1479 idle_set(&mesh->loop, idle, mesh);
1481 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1485 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1486 meshlink_submesh_t *s = NULL;
1489 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1490 meshlink_errno = MESHLINK_EINVAL;
1494 if(!submesh || !*submesh) {
1495 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1496 meshlink_errno = MESHLINK_EINVAL;
1501 pthread_mutex_lock(&mesh->mutex);
1503 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1505 pthread_mutex_unlock(&mesh->mutex);
1510 static void *meshlink_main_loop(void *arg) {
1511 meshlink_handle_t *mesh = arg;
1513 if(mesh->netns != -1) {
1516 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1517 pthread_cond_signal(&mesh->cond);
1522 pthread_cond_signal(&mesh->cond);
1524 #endif // HAVE_SETNS
1529 if(mesh->discovery) {
1530 discovery_start(mesh);
1535 pthread_mutex_lock(&mesh->mutex);
1537 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1538 pthread_cond_broadcast(&mesh->cond);
1540 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1542 pthread_mutex_unlock(&mesh->mutex);
1547 if(mesh->discovery) {
1548 discovery_stop(mesh);
1556 bool meshlink_start(meshlink_handle_t *mesh) {
1558 assert(mesh->private_key);
1561 meshlink_errno = MESHLINK_EINVAL;
1565 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1567 pthread_mutex_lock(&mesh->mutex);
1569 assert(mesh->self->ecdsa);
1570 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1572 if(mesh->threadstarted) {
1573 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1574 pthread_mutex_unlock(&mesh->mutex);
1578 if(mesh->listen_socket[0].tcp.fd < 0) {
1579 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1580 meshlink_errno = MESHLINK_ENETWORK;
1584 // TODO: open listening sockets first
1586 //Check that a valid name is set
1588 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1589 meshlink_errno = MESHLINK_EINVAL;
1590 pthread_mutex_unlock(&mesh->mutex);
1594 init_outgoings(mesh);
1596 // Start the main thread
1598 event_loop_start(&mesh->loop);
1600 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1601 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1602 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1603 meshlink_errno = MESHLINK_EINTERNAL;
1604 event_loop_stop(&mesh->loop);
1605 pthread_mutex_unlock(&mesh->mutex);
1609 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1610 mesh->threadstarted = true;
1612 // Ensure we are considered reachable
1615 pthread_mutex_unlock(&mesh->mutex);
1619 void meshlink_stop(meshlink_handle_t *mesh) {
1621 meshlink_errno = MESHLINK_EINVAL;
1625 pthread_mutex_lock(&mesh->mutex);
1626 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1628 // Shut down the main thread
1629 event_loop_stop(&mesh->loop);
1631 // Send ourselves a UDP packet to kick the event loop
1632 for(int i = 0; i < mesh->listen_sockets; i++) {
1634 socklen_t salen = sizeof(sa);
1636 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1637 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1641 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1642 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1646 if(mesh->threadstarted) {
1647 // Wait for the main thread to finish
1648 pthread_mutex_unlock(&mesh->mutex);
1649 pthread_join(mesh->thread, NULL);
1650 pthread_mutex_lock(&mesh->mutex);
1652 mesh->threadstarted = false;
1655 // Close all metaconnections
1656 if(mesh->connections) {
1657 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1659 connection_t *c = node->data;
1661 terminate_connection(mesh, c, false);
1665 exit_outgoings(mesh);
1667 // Ensure we are considered unreachable
1672 // Try to write out any changed node config files, ignore errors at this point.
1674 for splay_each(node_t, n, mesh->nodes) {
1675 if(n->status.dirty) {
1676 n->status.dirty = !node_write_config(mesh, n);
1681 pthread_mutex_unlock(&mesh->mutex);
1684 void meshlink_close(meshlink_handle_t *mesh) {
1686 meshlink_errno = MESHLINK_EINVAL;
1690 // stop can be called even if mesh has not been started
1691 meshlink_stop(mesh);
1693 // lock is not released after this
1694 pthread_mutex_lock(&mesh->mutex);
1696 // Close and free all resources used.
1698 close_network_connections(mesh);
1700 logger(mesh, MESHLINK_INFO, "Terminating");
1702 event_loop_exit(&mesh->loop);
1706 if(mesh->confbase) {
1712 ecdsa_free(mesh->invitation_key);
1714 if(mesh->netns != -1) {
1718 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1722 meshlink_queue_exit(&mesh->outpacketqueue);
1725 free(mesh->appname);
1726 free(mesh->confbase);
1727 free(mesh->config_key);
1728 ecdsa_free(mesh->private_key);
1730 main_config_unlock(mesh);
1732 pthread_mutex_unlock(&mesh->mutex);
1733 pthread_mutex_destroy(&mesh->mutex);
1735 memset(mesh, 0, sizeof(*mesh));
1740 bool meshlink_destroy(const char *confbase) {
1742 meshlink_errno = MESHLINK_EINVAL;
1746 /* Exit early if the confbase directory itself doesn't exist */
1747 if(access(confbase, F_OK) && errno == ENOENT) {
1751 /* Take the lock the same way meshlink_open() would. */
1752 char lockfilename[PATH_MAX];
1753 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1755 FILE *lockfile = fopen(lockfilename, "w+");
1758 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1759 meshlink_errno = MESHLINK_ESTORAGE;
1764 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1768 // TODO: use _locking()?
1771 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1772 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1774 meshlink_errno = MESHLINK_EBUSY;
1780 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1781 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1785 if(unlink(lockfilename)) {
1786 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1788 meshlink_errno = MESHLINK_ESTORAGE;
1794 if(!sync_path(confbase)) {
1795 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1796 meshlink_errno = MESHLINK_ESTORAGE;
1803 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1805 meshlink_errno = MESHLINK_EINVAL;
1809 pthread_mutex_lock(&mesh->mutex);
1810 mesh->receive_cb = cb;
1811 pthread_mutex_unlock(&mesh->mutex);
1814 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1816 meshlink_errno = MESHLINK_EINVAL;
1820 pthread_mutex_lock(&mesh->mutex);
1821 mesh->connection_try_cb = cb;
1822 pthread_mutex_unlock(&mesh->mutex);
1825 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1827 meshlink_errno = MESHLINK_EINVAL;
1831 pthread_mutex_lock(&mesh->mutex);
1832 mesh->node_status_cb = cb;
1833 pthread_mutex_unlock(&mesh->mutex);
1836 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1838 meshlink_errno = MESHLINK_EINVAL;
1842 pthread_mutex_lock(&mesh->mutex);
1843 mesh->node_pmtu_cb = cb;
1844 pthread_mutex_unlock(&mesh->mutex);
1847 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1849 meshlink_errno = MESHLINK_EINVAL;
1853 pthread_mutex_lock(&mesh->mutex);
1854 mesh->node_duplicate_cb = cb;
1855 pthread_mutex_unlock(&mesh->mutex);
1858 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1860 pthread_mutex_lock(&mesh->mutex);
1862 mesh->log_level = cb ? level : 0;
1863 pthread_mutex_unlock(&mesh->mutex);
1866 global_log_level = cb ? level : 0;
1870 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1872 meshlink_errno = MESHLINK_EINVAL;
1876 pthread_mutex_lock(&mesh->mutex);
1877 mesh->error_cb = cb;
1878 pthread_mutex_unlock(&mesh->mutex);
1881 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1882 meshlink_packethdr_t *hdr;
1884 // Validate arguments
1885 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1886 meshlink_errno = MESHLINK_EINVAL;
1895 meshlink_errno = MESHLINK_EINVAL;
1899 node_t *n = (node_t *)destination;
1901 if(n->status.blacklisted) {
1902 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1903 meshlink_errno = MESHLINK_EBLACKLISTED;
1907 // Prepare the packet
1908 vpn_packet_t *packet = malloc(sizeof(*packet));
1911 meshlink_errno = MESHLINK_ENOMEM;
1915 packet->probe = false;
1916 packet->tcp = false;
1917 packet->len = len + sizeof(*hdr);
1919 hdr = (meshlink_packethdr_t *)packet->data;
1920 memset(hdr, 0, sizeof(*hdr));
1921 // leave the last byte as 0 to make sure strings are always
1922 // null-terminated if they are longer than the buffer
1923 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1924 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1926 memcpy(packet->data + sizeof(*hdr), data, len);
1929 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1931 meshlink_errno = MESHLINK_ENOMEM;
1935 // Notify event loop
1936 signal_trigger(&mesh->loop, &mesh->datafromapp);
1941 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1943 meshlink_handle_t *mesh = data;
1944 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1950 mesh->self->in_packets++;
1951 mesh->self->in_bytes += packet->len;
1952 route(mesh, mesh->self, packet);
1957 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1958 if(!mesh || !destination) {
1959 meshlink_errno = MESHLINK_EINVAL;
1963 pthread_mutex_lock(&mesh->mutex);
1965 node_t *n = (node_t *)destination;
1967 if(!n->status.reachable) {
1968 pthread_mutex_unlock(&mesh->mutex);
1971 } else if(n->mtuprobes > 30 && n->minmtu) {
1972 pthread_mutex_unlock(&mesh->mutex);
1975 pthread_mutex_unlock(&mesh->mutex);
1980 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1981 if(!mesh || !node) {
1982 meshlink_errno = MESHLINK_EINVAL;
1986 pthread_mutex_lock(&mesh->mutex);
1988 node_t *n = (node_t *)node;
1990 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1991 meshlink_errno = MESHLINK_EINTERNAL;
1992 pthread_mutex_unlock(&mesh->mutex);
1996 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1999 meshlink_errno = MESHLINK_EINTERNAL;
2002 pthread_mutex_unlock(&mesh->mutex);
2006 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2008 meshlink_errno = MESHLINK_EINVAL;
2012 return (meshlink_node_t *)mesh->self;
2015 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2016 if(!mesh || !name) {
2017 meshlink_errno = MESHLINK_EINVAL;
2023 pthread_mutex_lock(&mesh->mutex);
2024 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2025 pthread_mutex_unlock(&mesh->mutex);
2028 meshlink_errno = MESHLINK_ENOENT;
2031 return (meshlink_node_t *)n;
2034 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2035 if(!mesh || !name) {
2036 meshlink_errno = MESHLINK_EINVAL;
2040 meshlink_submesh_t *submesh = NULL;
2042 pthread_mutex_lock(&mesh->mutex);
2043 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2044 pthread_mutex_unlock(&mesh->mutex);
2047 meshlink_errno = MESHLINK_ENOENT;
2053 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2054 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2055 meshlink_errno = MESHLINK_EINVAL;
2059 meshlink_node_t **result;
2062 pthread_mutex_lock(&mesh->mutex);
2064 *nmemb = mesh->nodes->count;
2065 result = realloc(nodes, *nmemb * sizeof(*nodes));
2068 meshlink_node_t **p = result;
2070 for splay_each(node_t, n, mesh->nodes) {
2071 *p++ = (meshlink_node_t *)n;
2076 meshlink_errno = MESHLINK_ENOMEM;
2079 pthread_mutex_unlock(&mesh->mutex);
2084 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) {
2085 meshlink_node_t **result;
2087 pthread_mutex_lock(&mesh->mutex);
2091 for splay_each(node_t, n, mesh->nodes) {
2092 if(search_node(n, condition)) {
2099 pthread_mutex_unlock(&mesh->mutex);
2103 result = realloc(nodes, *nmemb * sizeof(*nodes));
2106 meshlink_node_t **p = result;
2108 for splay_each(node_t, n, mesh->nodes) {
2109 if(search_node(n, condition)) {
2110 *p++ = (meshlink_node_t *)n;
2116 meshlink_errno = MESHLINK_ENOMEM;
2119 pthread_mutex_unlock(&mesh->mutex);
2124 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2125 dev_class_t *devclass = (dev_class_t *)condition;
2127 if(*devclass == (dev_class_t)node->devclass) {
2134 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2135 if(condition == node->submesh) {
2147 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2148 const struct time_range *range = condition;
2149 time_t start = node->last_reachable;
2150 time_t end = node->last_unreachable;
2160 if(range->end >= range->start) {
2161 return start <= range->end && end >= range->start;
2163 return start > range->start || end < range->end;
2167 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) {
2168 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2169 meshlink_errno = MESHLINK_EINVAL;
2173 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2176 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2177 if(!mesh || !submesh || !nmemb) {
2178 meshlink_errno = MESHLINK_EINVAL;
2182 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2185 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) {
2186 if(!mesh || !nmemb) {
2187 meshlink_errno = MESHLINK_EINVAL;
2191 struct time_range range = {start, end};
2193 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2196 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2197 if(!mesh || !node) {
2198 meshlink_errno = MESHLINK_EINVAL;
2202 dev_class_t devclass;
2204 pthread_mutex_lock(&mesh->mutex);
2206 devclass = ((node_t *)node)->devclass;
2208 pthread_mutex_unlock(&mesh->mutex);
2213 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2214 if(!mesh || !node) {
2215 meshlink_errno = MESHLINK_EINVAL;
2219 node_t *n = (node_t *)node;
2221 meshlink_submesh_t *s;
2223 s = (meshlink_submesh_t *)n->submesh;
2228 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2229 if(!mesh || !node) {
2230 meshlink_errno = MESHLINK_EINVAL;
2234 node_t *n = (node_t *)node;
2237 pthread_mutex_lock(&mesh->mutex);
2238 reachable = n->status.reachable && !n->status.blacklisted;
2240 if(last_reachable) {
2241 *last_reachable = n->last_reachable;
2244 if(last_unreachable) {
2245 *last_unreachable = n->last_unreachable;
2248 pthread_mutex_unlock(&mesh->mutex);
2253 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2254 if(!mesh || !data || !len || !signature || !siglen) {
2255 meshlink_errno = MESHLINK_EINVAL;
2259 if(*siglen < MESHLINK_SIGLEN) {
2260 meshlink_errno = MESHLINK_EINVAL;
2264 pthread_mutex_lock(&mesh->mutex);
2266 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2267 meshlink_errno = MESHLINK_EINTERNAL;
2268 pthread_mutex_unlock(&mesh->mutex);
2272 *siglen = MESHLINK_SIGLEN;
2273 pthread_mutex_unlock(&mesh->mutex);
2277 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2278 if(!mesh || !data || !len || !signature) {
2279 meshlink_errno = MESHLINK_EINVAL;
2283 if(siglen != MESHLINK_SIGLEN) {
2284 meshlink_errno = MESHLINK_EINVAL;
2288 pthread_mutex_lock(&mesh->mutex);
2292 struct node_t *n = (struct node_t *)source;
2294 if(!node_read_public_key(mesh, n)) {
2295 meshlink_errno = MESHLINK_EINTERNAL;
2298 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2301 pthread_mutex_unlock(&mesh->mutex);
2305 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2306 pthread_mutex_lock(&mesh->mutex);
2308 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2311 // TODO: Update invitation key if necessary?
2314 pthread_mutex_unlock(&mesh->mutex);
2316 return mesh->invitation_key;
2319 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2320 if(!mesh || !node || !address) {
2321 meshlink_errno = MESHLINK_EINVAL;
2325 if(!is_valid_hostname(address)) {
2326 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2327 meshlink_errno = MESHLINK_EINVAL;
2331 if(port && !is_valid_port(port)) {
2332 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2333 meshlink_errno = MESHLINK_EINVAL;
2337 char *canonical_address;
2340 xasprintf(&canonical_address, "%s %s", address, port);
2342 canonical_address = xstrdup(address);
2345 pthread_mutex_lock(&mesh->mutex);
2347 node_t *n = (node_t *)node;
2348 free(n->canonical_address);
2349 n->canonical_address = canonical_address;
2351 if(!node_write_config(mesh, n)) {
2352 pthread_mutex_unlock(&mesh->mutex);
2356 pthread_mutex_unlock(&mesh->mutex);
2358 return config_sync(mesh, "current");
2361 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2362 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2365 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2367 meshlink_errno = MESHLINK_EINVAL;
2371 char *address = meshlink_get_external_address(mesh);
2377 bool rval = meshlink_add_address(mesh, address);
2383 int meshlink_get_port(meshlink_handle_t *mesh) {
2385 meshlink_errno = MESHLINK_EINVAL;
2390 meshlink_errno = MESHLINK_EINTERNAL;
2396 pthread_mutex_lock(&mesh->mutex);
2397 port = atoi(mesh->myport);
2398 pthread_mutex_unlock(&mesh->mutex);
2403 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2404 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2405 meshlink_errno = MESHLINK_EINVAL;
2409 if(mesh->myport && port == atoi(mesh->myport)) {
2413 if(!try_bind(port)) {
2414 meshlink_errno = MESHLINK_ENETWORK;
2418 devtool_trybind_probe();
2422 pthread_mutex_lock(&mesh->mutex);
2424 if(mesh->threadstarted) {
2425 meshlink_errno = MESHLINK_EINVAL;
2430 xasprintf(&mesh->myport, "%d", port);
2432 /* Close down the network. This also deletes mesh->self. */
2433 close_network_connections(mesh);
2435 /* Recreate mesh->self. */
2436 mesh->self = new_node();
2437 mesh->self->name = xstrdup(mesh->name);
2438 mesh->self->devclass = mesh->devclass;
2439 mesh->self->session_id = mesh->session_id;
2440 xasprintf(&mesh->myport, "%d", port);
2442 if(!node_read_public_key(mesh, mesh->self)) {
2443 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2444 meshlink_errno = MESHLINK_ESTORAGE;
2445 free_node(mesh->self);
2448 } else if(!setup_network(mesh)) {
2449 meshlink_errno = MESHLINK_ENETWORK;
2453 /* Rebuild our own list of recent addresses */
2454 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2455 add_local_addresses(mesh);
2457 /* Write meshlink.conf with the updated port number */
2458 write_main_config_files(mesh);
2460 rval = config_sync(mesh, "current");
2463 pthread_mutex_unlock(&mesh->mutex);
2465 return rval && meshlink_get_port(mesh) == port;
2468 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2469 mesh->invitation_timeout = timeout;
2472 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2473 meshlink_submesh_t *s = NULL;
2476 meshlink_errno = MESHLINK_EINVAL;
2481 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2484 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2485 meshlink_errno = MESHLINK_EINVAL;
2489 s = (meshlink_submesh_t *)mesh->self->submesh;
2492 pthread_mutex_lock(&mesh->mutex);
2494 // Check validity of the new node's name
2495 if(!check_id(name)) {
2496 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2497 meshlink_errno = MESHLINK_EINVAL;
2498 pthread_mutex_unlock(&mesh->mutex);
2502 // Ensure no host configuration file with that name exists
2503 if(config_exists(mesh, "current", name)) {
2504 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2505 meshlink_errno = MESHLINK_EEXIST;
2506 pthread_mutex_unlock(&mesh->mutex);
2510 // Ensure no other nodes know about this name
2511 if(lookup_node(mesh, name)) {
2512 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2513 meshlink_errno = MESHLINK_EEXIST;
2514 pthread_mutex_unlock(&mesh->mutex);
2518 // Get the local address
2519 char *address = get_my_hostname(mesh, flags);
2522 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2523 meshlink_errno = MESHLINK_ERESOLV;
2524 pthread_mutex_unlock(&mesh->mutex);
2528 if(!refresh_invitation_key(mesh)) {
2529 meshlink_errno = MESHLINK_EINTERNAL;
2530 pthread_mutex_unlock(&mesh->mutex);
2534 // If we changed our own host config file, write it out now
2535 if(mesh->self->status.dirty) {
2536 if(!node_write_config(mesh, mesh->self)) {
2537 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2538 pthread_mutex_unlock(&mesh->mutex);
2545 // Create a hash of the key.
2546 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2547 sha512(fingerprint, strlen(fingerprint), hash);
2548 b64encode_urlsafe(hash, hash, 18);
2550 // Create a random cookie for this invitation.
2552 randomize(cookie, 18);
2554 // Create a filename that doesn't reveal the cookie itself
2555 char buf[18 + strlen(fingerprint)];
2556 char cookiehash[64];
2557 memcpy(buf, cookie, 18);
2558 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2559 sha512(buf, sizeof(buf), cookiehash);
2560 b64encode_urlsafe(cookiehash, cookiehash, 18);
2562 b64encode_urlsafe(cookie, cookie, 18);
2566 /* Construct the invitation file */
2567 uint8_t outbuf[4096];
2568 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2570 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2571 packmsg_add_str(&inv, name);
2572 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2573 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2575 /* TODO: Add several host config files to bootstrap connections.
2576 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2577 * and are not blacklisted.
2579 config_t configs[5];
2580 memset(configs, 0, sizeof(configs));
2583 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2587 /* Append host config files to the invitation file */
2588 packmsg_add_array(&inv, count);
2590 for(int i = 0; i < count; i++) {
2591 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2592 config_free(&configs[i]);
2595 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2597 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2598 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2599 meshlink_errno = MESHLINK_ESTORAGE;
2600 pthread_mutex_unlock(&mesh->mutex);
2604 // Create an URL from the local address, key hash and cookie
2606 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2609 pthread_mutex_unlock(&mesh->mutex);
2613 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2614 return meshlink_invite_ex(mesh, submesh, name, 0);
2617 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2618 if(!mesh || !invitation) {
2619 meshlink_errno = MESHLINK_EINVAL;
2623 join_state_t state = {
2628 ecdsa_t *key = NULL;
2629 ecdsa_t *hiskey = NULL;
2631 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2632 char copy[strlen(invitation) + 1];
2634 pthread_mutex_lock(&mesh->mutex);
2636 //Before doing meshlink_join make sure we are not connected to another mesh
2637 if(mesh->threadstarted) {
2638 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2639 meshlink_errno = MESHLINK_EINVAL;
2643 // 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.
2644 if(mesh->nodes->count > 1) {
2645 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2646 meshlink_errno = MESHLINK_EINVAL;
2650 strcpy(copy, invitation);
2652 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2654 char *slash = strchr(copy, '/');
2662 if(strlen(slash) != 48) {
2666 char *address = copy;
2669 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2673 if(mesh->inviter_commits_first) {
2674 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2677 // Generate a throw-away key for the invitation.
2678 key = ecdsa_generate();
2681 meshlink_errno = MESHLINK_EINTERNAL;
2685 char *b64key = ecdsa_get_base64_public_key(key);
2688 while(address && *address) {
2689 // We allow commas in the address part to support multiple addresses in one invitation URL.
2690 comma = strchr(address, ',');
2696 // Split of the port
2697 port = strrchr(address, ':');
2705 // IPv6 address are enclosed in brackets, per RFC 3986
2706 if(*address == '[') {
2708 char *bracket = strchr(address, ']');
2721 // Connect to the meshlink daemon mentioned in the URL.
2722 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2725 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2726 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2728 if(state.sock == -1) {
2729 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2730 meshlink_errno = MESHLINK_ENETWORK;
2734 set_timeout(state.sock, 5000);
2736 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2737 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2738 meshlink_errno = MESHLINK_ENETWORK;
2739 closesocket(state.sock);
2747 meshlink_errno = MESHLINK_ERESOLV;
2750 if(state.sock != -1 || !comma) {
2757 if(state.sock == -1) {
2761 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2763 // Tell him we have an invitation, and give him our throw-away key.
2767 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2768 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2769 meshlink_errno = MESHLINK_ENETWORK;
2775 char hisname[4096] = "";
2776 int code, hismajor, hisminor = 0;
2778 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) {
2779 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2780 meshlink_errno = MESHLINK_ENETWORK;
2784 // Check if the hash of the key he gave us matches the hash in the URL.
2785 char *fingerprint = state.line + 2;
2788 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2789 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2790 meshlink_errno = MESHLINK_EINTERNAL;
2794 if(memcmp(hishash, state.hash, 18)) {
2795 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2796 meshlink_errno = MESHLINK_EPEER;
2800 hiskey = ecdsa_set_base64_public_key(fingerprint);
2803 meshlink_errno = MESHLINK_EINTERNAL;
2807 // Start an SPTPS session
2808 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2809 meshlink_errno = MESHLINK_EINTERNAL;
2813 // Feed rest of input buffer to SPTPS
2814 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2815 meshlink_errno = MESHLINK_EPEER;
2820 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2822 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2824 if(errno == EINTR) {
2828 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2829 meshlink_errno = MESHLINK_ENETWORK;
2833 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2834 meshlink_errno = MESHLINK_EPEER;
2839 if(!state.success) {
2840 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2841 meshlink_errno = MESHLINK_EPEER;
2845 sptps_stop(&state.sptps);
2848 closesocket(state.sock);
2850 pthread_mutex_unlock(&mesh->mutex);
2854 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2855 meshlink_errno = MESHLINK_EINVAL;
2857 sptps_stop(&state.sptps);
2861 if(state.sock != -1) {
2862 closesocket(state.sock);
2865 pthread_mutex_unlock(&mesh->mutex);
2869 char *meshlink_export(meshlink_handle_t *mesh) {
2871 meshlink_errno = MESHLINK_EINVAL;
2875 // Create a config file on the fly.
2878 packmsg_output_t out = {buf, sizeof(buf)};
2879 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2880 packmsg_add_str(&out, mesh->name);
2881 packmsg_add_str(&out, CORE_MESH);
2883 pthread_mutex_lock(&mesh->mutex);
2885 packmsg_add_int32(&out, mesh->self->devclass);
2886 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2887 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2888 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2892 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2893 if(mesh->self->recent[i].sa.sa_family) {
2900 packmsg_add_array(&out, count);
2902 for(uint32_t i = 0; i < count; i++) {
2903 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2906 packmsg_add_int64(&out, 0);
2907 packmsg_add_int64(&out, 0);
2909 pthread_mutex_unlock(&mesh->mutex);
2911 if(!packmsg_output_ok(&out)) {
2912 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2913 meshlink_errno = MESHLINK_EINTERNAL;
2917 // Prepare a base64-encoded packmsg array containing our config file
2919 uint32_t len = packmsg_output_size(&out, buf);
2920 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2921 uint8_t *buf2 = xmalloc(len2);
2922 packmsg_output_t out2 = {buf2, len2};
2923 packmsg_add_array(&out2, 1);
2924 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2926 if(!packmsg_output_ok(&out2)) {
2927 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2928 meshlink_errno = MESHLINK_EINTERNAL;
2933 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2935 return (char *)buf2;
2938 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2939 if(!mesh || !data) {
2940 meshlink_errno = MESHLINK_EINVAL;
2944 size_t datalen = strlen(data);
2945 uint8_t *buf = xmalloc(datalen);
2946 int buflen = b64decode(data, buf, datalen);
2949 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2950 meshlink_errno = MESHLINK_EPEER;
2954 packmsg_input_t in = {buf, buflen};
2955 uint32_t count = packmsg_get_array(&in);
2958 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2959 meshlink_errno = MESHLINK_EPEER;
2963 pthread_mutex_lock(&mesh->mutex);
2967 uint32_t len = packmsg_get_bin_raw(&in, &data);
2973 packmsg_input_t in2 = {data, len};
2974 uint32_t version = packmsg_get_uint32(&in2);
2975 char *name = packmsg_get_str_dup(&in2);
2977 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2979 packmsg_input_invalidate(&in);
2983 if(!check_id(name)) {
2988 node_t *n = lookup_node(mesh, name);
2991 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2999 config_t config = {data, len};
3001 if(!node_read_from_config(mesh, n, &config)) {
3003 packmsg_input_invalidate(&in);
3007 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3008 n->last_reachable = 0;
3009 n->last_unreachable = 0;
3011 if(!node_write_config(mesh, n)) {
3019 pthread_mutex_unlock(&mesh->mutex);
3023 if(!packmsg_done(&in)) {
3024 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3025 meshlink_errno = MESHLINK_EPEER;
3029 if(!config_sync(mesh, "current")) {
3036 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3037 if(n == mesh->self) {
3038 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3039 meshlink_errno = MESHLINK_EINVAL;
3043 if(n->status.blacklisted) {
3044 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3048 n->status.blacklisted = true;
3050 /* Immediately shut down any connections we have with the blacklisted node.
3051 * We can't call terminate_connection(), because we might be called from a callback function.
3053 for list_each(connection_t, c, mesh->connections) {
3055 shutdown(c->socket, SHUT_RDWR);
3059 utcp_abort_all_connections(n->utcp);
3065 n->status.udp_confirmed = false;
3067 if(n->status.reachable) {
3068 n->last_unreachable = mesh->loop.now.tv_sec;
3071 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3072 * manually call the status callback if necessary.
3074 if(n->status.reachable && mesh->node_status_cb) {
3075 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3078 return node_write_config(mesh, n) && config_sync(mesh, "current");
3081 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3082 if(!mesh || !node) {
3083 meshlink_errno = MESHLINK_EINVAL;
3087 pthread_mutex_lock(&mesh->mutex);
3089 if(!blacklist(mesh, (node_t *)node)) {
3090 pthread_mutex_unlock(&mesh->mutex);
3094 pthread_mutex_unlock(&mesh->mutex);
3096 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3100 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3101 if(!mesh || !name) {
3102 meshlink_errno = MESHLINK_EINVAL;
3106 pthread_mutex_lock(&mesh->mutex);
3108 node_t *n = lookup_node(mesh, (char *)name);
3112 n->name = xstrdup(name);
3116 if(!blacklist(mesh, (node_t *)n)) {
3117 pthread_mutex_unlock(&mesh->mutex);
3121 pthread_mutex_unlock(&mesh->mutex);
3123 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3127 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3128 if(n == mesh->self) {
3129 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3130 meshlink_errno = MESHLINK_EINVAL;
3134 if(!n->status.blacklisted) {
3135 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3139 n->status.blacklisted = false;
3141 if(n->status.reachable) {
3142 n->last_reachable = mesh->loop.now.tv_sec;
3143 update_node_status(mesh, n);
3146 return node_write_config(mesh, n) && config_sync(mesh, "current");
3149 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3150 if(!mesh || !node) {
3151 meshlink_errno = MESHLINK_EINVAL;
3155 pthread_mutex_lock(&mesh->mutex);
3157 if(!whitelist(mesh, (node_t *)node)) {
3158 pthread_mutex_unlock(&mesh->mutex);
3162 pthread_mutex_unlock(&mesh->mutex);
3164 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3168 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3169 if(!mesh || !name) {
3170 meshlink_errno = MESHLINK_EINVAL;
3174 pthread_mutex_lock(&mesh->mutex);
3176 node_t *n = lookup_node(mesh, (char *)name);
3180 n->name = xstrdup(name);
3184 if(!whitelist(mesh, (node_t *)n)) {
3185 pthread_mutex_unlock(&mesh->mutex);
3189 pthread_mutex_unlock(&mesh->mutex);
3191 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3195 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3196 mesh->default_blacklist = blacklist;
3199 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3200 if(!mesh || !node) {
3201 meshlink_errno = MESHLINK_EINVAL;
3205 node_t *n = (node_t *)node;
3207 pthread_mutex_lock(&mesh->mutex);
3209 /* Check that the node is not reachable */
3210 if(n->status.reachable || n->connection) {
3211 pthread_mutex_unlock(&mesh->mutex);
3212 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3216 /* Check that we don't have any active UTCP connections */
3217 if(n->utcp && utcp_is_active(n->utcp)) {
3218 pthread_mutex_unlock(&mesh->mutex);
3219 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3223 /* Check that we have no active connections to this node */
3224 for list_each(connection_t, c, mesh->connections) {
3226 pthread_mutex_unlock(&mesh->mutex);
3227 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3232 /* Remove any pending outgoings to this node */
3233 if(mesh->outgoings) {
3234 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3235 if(outgoing->node == n) {
3236 list_delete_node(mesh->outgoings, node);
3241 /* Delete the config file for this node */
3242 if(!config_delete(mesh, "current", n->name)) {
3243 pthread_mutex_unlock(&mesh->mutex);
3247 /* Delete the node struct and any remaining edges referencing this node */
3250 pthread_mutex_unlock(&mesh->mutex);
3252 return config_sync(mesh, "current");
3255 /* Hint that a hostname may be found at an address
3256 * See header file for detailed comment.
3258 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3259 if(!mesh || !node || !addr) {
3260 meshlink_errno = EINVAL;
3264 pthread_mutex_lock(&mesh->mutex);
3266 node_t *n = (node_t *)node;
3268 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3269 if(!node_write_config(mesh, n)) {
3270 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3274 pthread_mutex_unlock(&mesh->mutex);
3275 // @TODO do we want to fire off a connection attempt right away?
3278 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3280 node_t *n = utcp->priv;
3281 meshlink_handle_t *mesh = n->mesh;
3282 return mesh->channel_accept_cb;
3285 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3287 if(aio->cb.buffer) {
3288 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3292 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3297 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3298 meshlink_channel_t *channel = connection->priv;
3304 node_t *n = channel->node;
3305 meshlink_handle_t *mesh = n->mesh;
3307 if(n->status.destroyed) {
3308 meshlink_channel_close(mesh, channel);
3312 const char *p = data;
3315 while(channel->aio_receive) {
3316 meshlink_aio_buffer_t *aio = channel->aio_receive;
3317 size_t todo = aio->len - aio->done;
3324 memcpy((char *)aio->data + aio->done, p, todo);
3326 ssize_t result = write(aio->fd, p, todo);
3335 if(aio->done == aio->len) {
3336 channel->aio_receive = aio->next;
3337 aio_signal(mesh, channel, aio);
3349 if(channel->receive_cb) {
3350 channel->receive_cb(mesh, channel, p, left);
3356 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3357 node_t *n = utcp_connection->utcp->priv;
3363 meshlink_handle_t *mesh = n->mesh;
3365 if(!mesh->channel_accept_cb) {
3369 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3371 channel->c = utcp_connection;
3373 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3374 utcp_accept(utcp_connection, channel_recv, channel);
3380 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3381 node_t *n = utcp->priv;
3383 if(n->status.destroyed) {
3387 meshlink_handle_t *mesh = n->mesh;
3388 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3391 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3392 if(!mesh || !channel) {
3393 meshlink_errno = MESHLINK_EINVAL;
3397 channel->receive_cb = cb;
3400 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3402 node_t *n = (node_t *)source;
3408 utcp_recv(n->utcp, data, len);
3411 static void channel_poll(struct utcp_connection *connection, size_t len) {
3412 meshlink_channel_t *channel = connection->priv;
3418 node_t *n = channel->node;
3419 meshlink_handle_t *mesh = n->mesh;
3420 meshlink_aio_buffer_t *aio = channel->aio_send;
3423 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3424 size_t left = aio->len - aio->done;
3432 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3435 size_t todo = utcp_get_sndbuf_free(connection);
3441 if(todo > sizeof(buf)) {
3445 ssize_t result = read(aio->fd, buf, todo);
3448 sent = utcp_send(connection, buf, result);
3458 /* If the buffer is now completely sent, call the callback and dispose of it. */
3459 if(aio->done >= aio->len) {
3460 channel->aio_send = aio->next;
3461 aio_signal(mesh, channel, aio);
3465 if(channel->poll_cb) {
3466 channel->poll_cb(mesh, channel, len);
3468 utcp_set_poll_cb(connection, NULL);
3473 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3474 if(!mesh || !channel) {
3475 meshlink_errno = MESHLINK_EINVAL;
3479 pthread_mutex_lock(&mesh->mutex);
3480 channel->poll_cb = cb;
3481 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3482 pthread_mutex_unlock(&mesh->mutex);
3485 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3487 meshlink_errno = MESHLINK_EINVAL;
3491 pthread_mutex_lock(&mesh->mutex);
3492 mesh->channel_accept_cb = cb;
3493 mesh->receive_cb = channel_receive;
3495 for splay_each(node_t, n, mesh->nodes) {
3496 if(!n->utcp && n != mesh->self) {
3497 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3501 pthread_mutex_unlock(&mesh->mutex);
3504 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3508 meshlink_errno = MESHLINK_EINVAL;
3512 pthread_mutex_lock(&mesh->mutex);
3513 utcp_set_sndbuf(channel->c, size);
3514 pthread_mutex_unlock(&mesh->mutex);
3517 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3521 meshlink_errno = MESHLINK_EINVAL;
3525 pthread_mutex_lock(&mesh->mutex);
3526 utcp_set_rcvbuf(channel->c, size);
3527 pthread_mutex_unlock(&mesh->mutex);
3530 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) {
3532 abort(); // TODO: handle non-NULL data
3535 if(!mesh || !node) {
3536 meshlink_errno = MESHLINK_EINVAL;
3540 pthread_mutex_lock(&mesh->mutex);
3542 node_t *n = (node_t *)node;
3545 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3546 mesh->receive_cb = channel_receive;
3549 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3550 pthread_mutex_unlock(&mesh->mutex);
3555 if(n->status.blacklisted) {
3556 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3557 meshlink_errno = MESHLINK_EBLACKLISTED;
3558 pthread_mutex_unlock(&mesh->mutex);
3562 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3564 channel->receive_cb = cb;
3567 channel->priv = (void *)data;
3570 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3572 pthread_mutex_unlock(&mesh->mutex);
3575 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3583 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) {
3584 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3587 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3588 if(!mesh || !channel) {
3589 meshlink_errno = MESHLINK_EINVAL;
3593 pthread_mutex_lock(&mesh->mutex);
3594 utcp_shutdown(channel->c, direction);
3595 pthread_mutex_unlock(&mesh->mutex);
3598 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3599 if(!mesh || !channel) {
3600 meshlink_errno = MESHLINK_EINVAL;
3604 pthread_mutex_lock(&mesh->mutex);
3606 utcp_close(channel->c);
3608 /* Clean up any outstanding AIO buffers. */
3609 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3611 aio_signal(mesh, channel, aio);
3615 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3617 aio_signal(mesh, channel, aio);
3621 pthread_mutex_unlock(&mesh->mutex);
3626 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3627 if(!mesh || !channel) {
3628 meshlink_errno = MESHLINK_EINVAL;
3637 meshlink_errno = MESHLINK_EINVAL;
3641 // TODO: more finegrained locking.
3642 // Ideally we want to put the data into the UTCP connection's send buffer.
3643 // Then, preferably only if there is room in the receiver window,
3644 // kick the meshlink thread to go send packets.
3648 pthread_mutex_lock(&mesh->mutex);
3650 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3651 if(channel->aio_send) {
3654 retval = utcp_send(channel->c, data, len);
3657 pthread_mutex_unlock(&mesh->mutex);
3660 meshlink_errno = MESHLINK_ENETWORK;
3666 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) {
3667 if(!mesh || !channel) {
3668 meshlink_errno = MESHLINK_EINVAL;
3673 meshlink_errno = MESHLINK_EINVAL;
3677 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3680 aio->cb.buffer = cb;
3683 pthread_mutex_lock(&mesh->mutex);
3685 /* Append the AIO buffer descriptor to the end of the chain */
3686 meshlink_aio_buffer_t **p = &channel->aio_send;
3694 /* Ensure the poll callback is set, and call it right now to push data if possible */
3695 utcp_set_poll_cb(channel->c, channel_poll);
3696 channel_poll(channel->c, len);
3698 pthread_mutex_unlock(&mesh->mutex);
3703 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) {
3704 if(!mesh || !channel) {
3705 meshlink_errno = MESHLINK_EINVAL;
3709 if(!len || fd == -1) {
3710 meshlink_errno = MESHLINK_EINVAL;
3714 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3720 pthread_mutex_lock(&mesh->mutex);
3722 /* Append the AIO buffer descriptor to the end of the chain */
3723 meshlink_aio_buffer_t **p = &channel->aio_send;
3731 /* Ensure the poll callback is set, and call it right now to push data if possible */
3732 utcp_set_poll_cb(channel->c, channel_poll);
3733 channel_poll(channel->c, len);
3735 pthread_mutex_unlock(&mesh->mutex);
3740 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) {
3741 if(!mesh || !channel) {
3742 meshlink_errno = MESHLINK_EINVAL;
3747 meshlink_errno = MESHLINK_EINVAL;
3751 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3754 aio->cb.buffer = cb;
3757 pthread_mutex_lock(&mesh->mutex);
3759 /* Append the AIO buffer descriptor to the end of the chain */
3760 meshlink_aio_buffer_t **p = &channel->aio_receive;
3768 pthread_mutex_unlock(&mesh->mutex);
3773 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) {
3774 if(!mesh || !channel) {
3775 meshlink_errno = MESHLINK_EINVAL;
3779 if(!len || fd == -1) {
3780 meshlink_errno = MESHLINK_EINVAL;
3784 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3790 pthread_mutex_lock(&mesh->mutex);
3792 /* Append the AIO buffer descriptor to the end of the chain */
3793 meshlink_aio_buffer_t **p = &channel->aio_receive;
3801 pthread_mutex_unlock(&mesh->mutex);
3806 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3807 if(!mesh || !channel) {
3808 meshlink_errno = MESHLINK_EINVAL;
3812 return channel->c->flags;
3815 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3816 if(!mesh || !channel) {
3817 meshlink_errno = MESHLINK_EINVAL;
3821 return utcp_get_sendq(channel->c);
3824 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3825 if(!mesh || !channel) {
3826 meshlink_errno = MESHLINK_EINVAL;
3830 return utcp_get_recvq(channel->c);
3833 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3834 if(!mesh || !node) {
3835 meshlink_errno = MESHLINK_EINVAL;
3839 node_t *n = (node_t *)node;
3841 pthread_mutex_lock(&mesh->mutex);
3844 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3847 utcp_set_user_timeout(n->utcp, timeout);
3849 pthread_mutex_unlock(&mesh->mutex);
3852 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3853 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3854 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3857 if(mesh->node_status_cb) {
3858 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3861 if(mesh->node_pmtu_cb) {
3862 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3866 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3867 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3868 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3872 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3873 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3877 n->status.duplicate = true;
3878 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3881 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3885 meshlink_errno = MESHLINK_EINVAL;
3889 pthread_mutex_lock(&mesh->mutex);
3891 if(mesh->discovery == enable) {
3895 if(mesh->threadstarted) {
3897 discovery_start(mesh);
3899 discovery_stop(mesh);
3903 mesh->discovery = enable;
3906 pthread_mutex_unlock(&mesh->mutex);
3910 meshlink_errno = MESHLINK_ENOTSUP;
3914 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3915 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3916 meshlink_errno = EINVAL;
3920 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3921 meshlink_errno = EINVAL;
3925 pthread_mutex_lock(&mesh->mutex);
3926 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3927 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3928 pthread_mutex_unlock(&mesh->mutex);
3931 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3932 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3933 meshlink_errno = EINVAL;
3937 if(fast_retry_period < 0) {
3938 meshlink_errno = EINVAL;
3942 pthread_mutex_lock(&mesh->mutex);
3943 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
3944 pthread_mutex_unlock(&mesh->mutex);
3947 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
3949 meshlink_errno = EINVAL;
3953 pthread_mutex_lock(&mesh->mutex);
3954 mesh->inviter_commits_first = inviter_commits_first;
3955 pthread_mutex_unlock(&mesh->mutex);
3958 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3961 if(!mesh->connections || !mesh->loop.running) {
3968 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
3969 // We should only call the callback function if we are in the background thread.
3970 if(!mesh->error_cb) {
3974 if(!mesh->threadstarted) {
3978 if(mesh->thread == pthread_self()) {
3979 mesh->error_cb(mesh, meshlink_errno);
3983 static void __attribute__((constructor)) meshlink_init(void) {
3987 static void __attribute__((destructor)) meshlink_exit(void) {