2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2021 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include "meshlink_internal.h"
39 #include "ed25519/sha512.h"
40 #include "discovery.h"
45 #define MSG_NOSIGNAL 0
47 __thread meshlink_errno_t meshlink_errno;
48 meshlink_log_cb_t global_log_cb;
49 meshlink_log_level_t global_log_level;
51 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
53 static int rstrip(char *value) {
54 int len = strlen(value);
56 while(len && strchr("\t\r\n ", value[len - 1])) {
63 static void get_canonical_address(node_t *n, char **hostname, char **port) {
64 if(!n->canonical_address) {
68 *hostname = xstrdup(n->canonical_address);
69 char *space = strchr(*hostname, ' ');
73 *port = xstrdup(space);
77 static bool is_valid_hostname(const char *hostname) {
82 for(const char *p = hostname; *p; p++) {
83 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
91 static bool is_valid_port(const char *port) {
98 unsigned long int result = strtoul(port, &end, 10);
99 return result && result < 65536 && !*end;
102 for(const char *p = port; *p; p++) {
103 if(!(isalnum(*p) || *p == '-')) {
111 static void set_timeout(int sock, int timeout) {
116 tv.tv_sec = timeout / 1000;
117 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
119 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
120 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
123 struct socket_in_netns_params {
132 static void *socket_in_netns_thread(void *arg) {
133 struct socket_in_netns_params *params = arg;
135 if(setns(params->netns, CLONE_NEWNET) == -1) {
136 meshlink_errno = MESHLINK_EINVAL;
140 params->fd = socket(params->domain, params->type, params->protocol);
146 static int socket_in_netns(int domain, int type, int protocol, int netns) {
148 return socket(domain, type, protocol);
152 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
156 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
157 if(pthread_join(thr, NULL) != 0) {
169 // Find out what local address a socket would use if we connect to the given address.
170 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
171 // of both endpoints, but this will actually not send any UDP packet.
172 static bool getlocaladdr(const char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
173 struct addrinfo *rai = NULL;
174 const struct addrinfo hint = {
175 .ai_family = AF_UNSPEC,
176 .ai_socktype = SOCK_DGRAM,
177 .ai_protocol = IPPROTO_UDP,
178 .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
181 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
185 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
192 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
200 if(getsockname(sock, &sa->sa, salen)) {
209 static bool getlocaladdrname(const char *destaddr, char *host, socklen_t hostlen, int netns) {
211 socklen_t salen = sizeof(sa);
213 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
217 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
224 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
225 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
228 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
229 logger(mesh, MESHLINK_DEBUG, "meshlink_get_external_address_for_family(%d)", family);
230 const char *url = mesh->external_address_url;
233 url = "http://meshlink.io/host.cgi";
236 /* Find the hostname part between the slashes */
237 if(strncmp(url, "http://", 7)) {
239 meshlink_errno = MESHLINK_EINTERNAL;
243 const char *begin = url + 7;
245 const char *end = strchr(begin, '/');
248 end = begin + strlen(begin);
252 char host[end - begin + 1];
253 strncpy(host, begin, end - begin);
254 host[end - begin] = 0;
256 char *port = strchr(host, ':');
262 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
263 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), SOCK_STREAM, 5);
265 char *hostname = NULL;
267 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
268 if(family != AF_UNSPEC && aip->ai_family != family) {
272 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
276 setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
280 set_timeout(s, 5000);
282 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
289 send(s, "GET ", 4, 0);
290 send(s, url, strlen(url), 0);
291 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
292 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
297 if(line[len - 1] == '\n') {
301 char *p = strrchr(line, '\n');
304 hostname = xstrdup(p + 1);
320 // Check that the hostname is reasonable
321 if(hostname && !is_valid_hostname(hostname)) {
327 meshlink_errno = MESHLINK_ERESOLV;
333 static bool is_localaddr(sockaddr_t *sa) {
334 switch(sa->sa.sa_family) {
336 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
339 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
340 return first == 0 || (first & 0xffc0) == 0xfe80;
348 #ifdef HAVE_GETIFADDRS
349 struct getifaddrs_in_netns_params {
350 struct ifaddrs **ifa;
355 static void *getifaddrs_in_netns_thread(void *arg) {
356 struct getifaddrs_in_netns_params *params = arg;
358 if(setns(params->netns, CLONE_NEWNET) == -1) {
359 meshlink_errno = MESHLINK_EINVAL;
363 if(getifaddrs(params->ifa) != 0) {
371 static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) {
373 return getifaddrs(ifa);
377 struct getifaddrs_in_netns_params params = {ifa, netns};
380 if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) {
381 if(pthread_join(thr, NULL) != 0) {
386 return *params.ifa ? 0 : -1;
394 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
395 logger(mesh, MESHLINK_DEBUG, "meshlink_get_local_address_for_family(%d)", family);
398 meshlink_errno = MESHLINK_EINVAL;
402 // Determine address of the local interface used for outgoing connections.
403 char localaddr[NI_MAXHOST];
404 bool success = false;
406 if(family == AF_INET) {
407 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
408 } else if(family == AF_INET6) {
409 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
412 #ifdef HAVE_GETIFADDRS
415 struct ifaddrs *ifa = NULL;
416 getifaddrs_in_netns(&ifa, mesh->netns);
418 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
419 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
421 if(!sa || sa->sa.sa_family != family) {
425 if(is_localaddr(sa)) {
429 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
441 meshlink_errno = MESHLINK_ENETWORK;
445 return xstrdup(localaddr);
448 static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
449 for(int i = 0; i < n; i++) {
454 // Ignore duplicate hostnames
457 for(int j = 0; j < i; j++) {
462 if(strcmp(host[i], host[j])) {
466 if(strcmp(port[i], port[j])) {
474 if(found || !is_valid_hostname(host[i])) {
484 // This gets the hostname part for use in invitation URLs
485 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
486 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
488 char *hostname[count];
490 char *hostport = NULL;
492 memset(hostname, 0, sizeof(hostname));
493 memset(port, 0, sizeof(port));
495 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
496 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
499 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
500 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
503 // Add all explicitly set invitation addresses
504 if(mesh->invitation_addresses) {
505 for list_each(char, combo, mesh->invitation_addresses) {
506 hostname[n] = xstrdup(combo);
507 char *slash = strrchr(hostname[n], '/');
511 port[n] = xstrdup(slash + 1);
518 // Add local addresses if requested
519 if(flags & MESHLINK_INVITE_LOCAL) {
520 if(flags & MESHLINK_INVITE_IPV4) {
521 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
524 if(flags & MESHLINK_INVITE_IPV6) {
525 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
529 // Add public/canonical addresses if requested
530 if(flags & MESHLINK_INVITE_PUBLIC) {
531 // Try the CanonicalAddress first
532 get_canonical_address(mesh->self, &hostname[n], &port[n]);
534 if(!hostname[n] && count == 4) {
535 if(flags & MESHLINK_INVITE_IPV4) {
536 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
539 if(flags & MESHLINK_INVITE_IPV6) {
540 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
547 for(int i = 0; i < n; i++) {
548 // Ensure we always have a port number
549 if(hostname[i] && !port[i]) {
550 port[i] = xstrdup(mesh->myport);
554 remove_duplicate_hostnames(hostname, port, n);
556 // Resolve the hostnames
557 for(int i = 0; i < n; i++) {
562 // Convert what we have to a sockaddr
563 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5);
569 // Remember the address(es)
570 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
571 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
578 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
579 remove_duplicate_hostnames(hostname, port, n);
581 // Concatenate all unique address to the hostport string
582 for(int i = 0; i < n; i++) {
587 // Append the address to the hostport string
589 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
591 hostport = newhostport;
600 static bool try_bind(meshlink_handle_t *mesh, int port) {
601 struct addrinfo *ai = NULL;
602 struct addrinfo hint = {
603 .ai_flags = AI_PASSIVE,
604 .ai_family = AF_UNSPEC,
605 .ai_socktype = SOCK_STREAM,
606 .ai_protocol = IPPROTO_TCP,
610 snprintf(portstr, sizeof(portstr), "%d", port);
612 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
616 bool success = false;
618 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
619 /* Try to bind to TCP. */
621 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
624 if(errno == EADDRINUSE) {
625 /* If this port is in use for any address family, avoid it. */
633 /* If TCP worked, then we require that UDP works as well. */
635 int udp_fd = setup_udp_listen_socket(mesh, aip);
652 int check_port(meshlink_handle_t *mesh) {
653 for(int i = 0; i < 1000; i++) {
654 int port = 0x1000 + prng(mesh, 0x8000);
656 if(try_bind(mesh, port)) {
658 xasprintf(&mesh->myport, "%d", port);
663 meshlink_errno = MESHLINK_ENETWORK;
664 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
668 static bool write_main_config_files(meshlink_handle_t *mesh) {
669 if(!mesh->confbase) {
675 /* Write the main config file */
676 packmsg_output_t out = {buf, sizeof buf};
678 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
679 packmsg_add_str(&out, mesh->name);
680 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
681 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
682 packmsg_add_uint16(&out, atoi(mesh->myport));
684 if(!packmsg_output_ok(&out)) {
688 config_t config = {buf, packmsg_output_size(&out, buf)};
690 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
694 /* Write our own host config file */
695 if(!node_write_config(mesh, mesh->self, true)) {
703 meshlink_handle_t *mesh;
705 char cookie[18 + 32];
716 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
717 meshlink_handle_t *mesh = state->mesh;
718 packmsg_input_t in = {buf, len};
719 uint32_t version = packmsg_get_uint32(&in);
721 if(version != MESHLINK_INVITATION_VERSION) {
722 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
726 char *name = packmsg_get_str_dup(&in);
727 char *submesh_name = packmsg_get_str_dup(&in);
728 dev_class_t devclass = packmsg_get_int32(&in);
729 uint32_t count = packmsg_get_array(&in);
731 if(!name || !check_id(name)) {
732 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
738 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
739 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
746 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
753 free(mesh->self->name);
755 mesh->self->name = xstrdup(name);
756 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
758 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
760 // Initialize configuration directory
761 if(!config_init(mesh, "current")) {
765 if(!write_main_config_files(mesh)) {
769 // Write host config files
770 for(uint32_t i = 0; i < count; i++) {
772 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
775 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
779 packmsg_input_t in2 = {data, data_len};
780 uint32_t version2 = packmsg_get_uint32(&in2);
781 char *name2 = packmsg_get_str_dup(&in2);
783 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
785 packmsg_input_invalidate(&in);
789 if(!check_id(name2)) {
794 if(!strcmp(name2, mesh->name)) {
795 logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n");
797 meshlink_errno = MESHLINK_EPEER;
801 node_t *n = new_node();
804 config_t config = {data, data_len};
806 if(!node_read_from_config(mesh, n, &config)) {
808 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
809 meshlink_errno = MESHLINK_EPEER;
814 /* The first host config file is of the inviter itself;
815 * remember the address we are currently using for the invitation connection.
818 socklen_t salen = sizeof(sa);
820 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
821 node_add_recent_address(mesh, n, &sa);
825 /* Clear the reachability times, since we ourself have never seen these nodes yet */
826 n->last_reachable = 0;
827 n->last_unreachable = 0;
829 if(!node_write_config(mesh, n, true)) {
837 /* Ensure the configuration directory metadata is on disk */
838 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
842 if(!mesh->inviter_commits_first) {
843 devtool_set_inviter_commits_first(false);
846 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
848 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
853 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
855 join_state_t *state = handle;
856 const char *ptr = data;
859 int result = send(state->sock, ptr, len, 0);
861 if(result == -1 && errno == EINTR) {
863 } else if(result <= 0) {
874 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
875 join_state_t *state = handle;
876 meshlink_handle_t *mesh = state->mesh;
878 if(mesh->inviter_commits_first) {
880 case SPTPS_HANDSHAKE:
881 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
887 if(!finalize_join(state, msg, len)) {
891 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
892 shutdown(state->sock, SHUT_RDWR);
893 state->success = true;
901 case SPTPS_HANDSHAKE:
902 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
905 return finalize_join(state, msg, len);
908 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
909 shutdown(state->sock, SHUT_RDWR);
910 state->success = true;
921 static bool recvline(join_state_t *state) {
922 char *newline = NULL;
924 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
925 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
927 if(result == -1 && errno == EINTR) {
929 } else if(result <= 0) {
933 state->blen += result;
936 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
940 size_t len = newline - state->buffer;
942 memcpy(state->line, state->buffer, len);
943 state->line[len] = 0;
944 memmove(state->buffer, newline + 1, state->blen - len - 1);
945 state->blen -= len + 1;
950 static bool sendline(int fd, const char *format, ...) {
956 va_start(ap, format);
957 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
960 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
968 int result = send(fd, p, blen, MSG_NOSIGNAL);
970 if(result == -1 && errno == EINTR) {
972 } else if(result <= 0) {
983 static const char *errstr[] = {
984 [MESHLINK_OK] = "No error",
985 [MESHLINK_EINVAL] = "Invalid argument",
986 [MESHLINK_ENOMEM] = "Out of memory",
987 [MESHLINK_ENOENT] = "No such node",
988 [MESHLINK_EEXIST] = "Node already exists",
989 [MESHLINK_EINTERNAL] = "Internal error",
990 [MESHLINK_ERESOLV] = "Could not resolve hostname",
991 [MESHLINK_ESTORAGE] = "Storage error",
992 [MESHLINK_ENETWORK] = "Network error",
993 [MESHLINK_EPEER] = "Error communicating with peer",
994 [MESHLINK_ENOTSUP] = "Operation not supported",
995 [MESHLINK_EBUSY] = "MeshLink instance already in use",
996 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
999 const char *meshlink_strerror(meshlink_errno_t err) {
1000 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
1001 return "Invalid error code";
1007 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
1008 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
1010 mesh->private_key = ecdsa_generate();
1011 mesh->invitation_key = ecdsa_generate();
1013 if(!mesh->private_key || !mesh->invitation_key) {
1014 logger(mesh, MESHLINK_ERROR, "Error during key generation!\n");
1015 meshlink_errno = MESHLINK_EINTERNAL;
1019 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1024 static struct timespec idle(event_loop_t *loop, void *data) {
1026 meshlink_handle_t *mesh = data;
1027 struct timespec t, tmin = {3600, 0};
1029 for splay_each(node_t, n, mesh->nodes) {
1034 t = utcp_timeout(n->utcp);
1036 if(timespec_lt(&t, &tmin)) {
1044 // Get our local address(es) by simulating connecting to an Internet host.
1045 static void add_local_addresses(meshlink_handle_t *mesh) {
1047 sa.storage.ss_family = AF_UNKNOWN;
1048 socklen_t salen = sizeof(sa);
1052 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1053 sa.in.sin_port = ntohs(atoi(mesh->myport));
1054 node_add_recent_address(mesh, mesh->self, &sa);
1061 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1062 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1063 node_add_recent_address(mesh, mesh->self, &sa);
1067 static bool meshlink_setup(meshlink_handle_t *mesh) {
1068 if(!config_destroy(mesh->confbase, "new")) {
1069 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1070 meshlink_errno = MESHLINK_ESTORAGE;
1074 if(!config_destroy(mesh->confbase, "old")) {
1075 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1076 meshlink_errno = MESHLINK_ESTORAGE;
1080 if(!config_init(mesh, "current")) {
1081 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1082 meshlink_errno = MESHLINK_ESTORAGE;
1086 if(!ecdsa_keygen(mesh)) {
1087 meshlink_errno = MESHLINK_EINTERNAL;
1091 if(check_port(mesh) == 0) {
1092 meshlink_errno = MESHLINK_ENETWORK;
1096 /* Create a node for ourself */
1098 mesh->self = new_node();
1099 mesh->self->name = xstrdup(mesh->name);
1100 mesh->self->devclass = mesh->devclass;
1101 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1102 mesh->self->session_id = mesh->session_id;
1104 if(!write_main_config_files(mesh)) {
1105 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1106 meshlink_errno = MESHLINK_ESTORAGE;
1110 /* Ensure the configuration directory metadata is on disk */
1111 if(!config_sync(mesh, "current")) {
1118 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1121 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1122 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1126 packmsg_input_t in = {config.buf, config.len};
1127 const void *private_key;
1128 const void *invitation_key;
1130 uint32_t version = packmsg_get_uint32(&in);
1131 char *name = packmsg_get_str_dup(&in);
1132 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1133 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1134 uint16_t myport = packmsg_get_uint16(&in);
1136 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1137 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1139 config_free(&config);
1143 if(mesh->name && strcmp(mesh->name, name)) {
1144 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1145 meshlink_errno = MESHLINK_ESTORAGE;
1147 config_free(&config);
1153 xasprintf(&mesh->myport, "%u", myport);
1154 mesh->private_key = ecdsa_set_private_key(private_key);
1155 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1156 config_free(&config);
1158 /* Create a node for ourself and read our host configuration file */
1160 mesh->self = new_node();
1161 mesh->self->name = xstrdup(name);
1162 mesh->self->devclass = mesh->devclass;
1163 mesh->self->session_id = mesh->session_id;
1165 if(!node_read_public_key(mesh, mesh->self)) {
1166 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1167 meshlink_errno = MESHLINK_ESTORAGE;
1168 free_node(mesh->self);
1177 static void *setup_network_in_netns_thread(void *arg) {
1178 meshlink_handle_t *mesh = arg;
1180 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1184 bool success = setup_network(mesh);
1185 return success ? arg : NULL;
1187 #endif // HAVE_SETNS
1189 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1190 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass);
1192 if(!confbase || !*confbase) {
1193 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 if(!appname || !*appname) {
1199 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1200 meshlink_errno = MESHLINK_EINVAL;
1204 if(strchr(appname, ' ')) {
1205 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1206 meshlink_errno = MESHLINK_EINVAL;
1210 if(name && !check_id(name)) {
1211 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1212 meshlink_errno = MESHLINK_EINVAL;
1216 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1217 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1218 meshlink_errno = MESHLINK_EINVAL;
1222 meshlink_open_params_t *params = xzalloc(sizeof * params);
1224 params->confbase = xstrdup(confbase);
1225 params->name = name ? xstrdup(name) : NULL;
1226 params->appname = xstrdup(appname);
1227 params->devclass = devclass;
1230 xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase);
1235 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1236 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns);
1239 meshlink_errno = MESHLINK_EINVAL;
1243 params->netns = netns;
1248 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1249 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen);
1252 meshlink_errno = MESHLINK_EINVAL;
1256 if((!key && keylen) || (key && !keylen)) {
1257 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1258 meshlink_errno = MESHLINK_EINVAL;
1263 params->keylen = keylen;
1268 bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) {
1269 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy);
1272 meshlink_errno = MESHLINK_EINVAL;
1276 params->storage_policy = policy;
1281 bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) {
1282 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename);
1284 if(!params || !filename) {
1285 meshlink_errno = MESHLINK_EINVAL;
1289 free(params->lock_filename);
1290 params->lock_filename = xstrdup(filename);
1295 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1296 logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen);
1298 if(!mesh || !new_key || !new_keylen) {
1299 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1300 meshlink_errno = MESHLINK_EINVAL;
1304 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1308 // Create hash for the new key
1309 void *new_config_key;
1310 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1312 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1313 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1314 meshlink_errno = MESHLINK_EINTERNAL;
1315 pthread_mutex_unlock(&mesh->mutex);
1319 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1321 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1322 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1323 meshlink_errno = MESHLINK_ESTORAGE;
1324 pthread_mutex_unlock(&mesh->mutex);
1328 devtool_keyrotate_probe(1);
1330 // Rename confbase/current/ to confbase/old
1332 if(!config_rename(mesh, "current", "old")) {
1333 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1334 meshlink_errno = MESHLINK_ESTORAGE;
1335 pthread_mutex_unlock(&mesh->mutex);
1339 devtool_keyrotate_probe(2);
1341 // Rename confbase/new/ to confbase/current
1343 if(!config_rename(mesh, "new", "current")) {
1344 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1345 meshlink_errno = MESHLINK_ESTORAGE;
1346 pthread_mutex_unlock(&mesh->mutex);
1350 devtool_keyrotate_probe(3);
1352 // Cleanup the "old" confbase sub-directory
1354 if(!config_destroy(mesh->confbase, "old")) {
1355 pthread_mutex_unlock(&mesh->mutex);
1359 // Change the mesh handle key with new key
1361 free(mesh->config_key);
1362 mesh->config_key = new_config_key;
1364 pthread_mutex_unlock(&mesh->mutex);
1369 void meshlink_open_params_free(meshlink_open_params_t *params) {
1370 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()");
1373 meshlink_errno = MESHLINK_EINVAL;
1377 free(params->confbase);
1379 free(params->appname);
1380 free(params->lock_filename);
1385 /// Device class traits
1386 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1387 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1388 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1389 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1390 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1393 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1394 logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass);
1396 if(!confbase || !*confbase) {
1397 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1398 meshlink_errno = MESHLINK_EINVAL;
1402 char lock_filename[PATH_MAX];
1403 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1405 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1406 meshlink_open_params_t params = {
1407 .confbase = (char *)confbase,
1408 .lock_filename = lock_filename,
1409 .name = (char *)name,
1410 .appname = (char *)appname,
1411 .devclass = devclass,
1415 return meshlink_open_ex(¶ms);
1418 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) {
1419 logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen);
1421 if(!confbase || !*confbase) {
1422 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1423 meshlink_errno = MESHLINK_EINVAL;
1427 char lock_filename[PATH_MAX];
1428 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1430 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1431 meshlink_open_params_t params = {
1432 .confbase = (char *)confbase,
1433 .lock_filename = lock_filename,
1434 .name = (char *)name,
1435 .appname = (char *)appname,
1436 .devclass = devclass,
1440 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1444 return meshlink_open_ex(¶ms);
1447 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1448 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass);
1451 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1452 meshlink_errno = MESHLINK_EINVAL;
1456 if(!check_id(name)) {
1457 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1458 meshlink_errno = MESHLINK_EINVAL;
1462 if(!appname || !*appname) {
1463 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1464 meshlink_errno = MESHLINK_EINVAL;
1468 if(strchr(appname, ' ')) {
1469 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1470 meshlink_errno = MESHLINK_EINVAL;
1474 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1475 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1476 meshlink_errno = MESHLINK_EINVAL;
1480 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1481 meshlink_open_params_t params = {
1482 .name = (char *)name,
1483 .appname = (char *)appname,
1484 .devclass = devclass,
1488 return meshlink_open_ex(¶ms);
1491 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1492 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()");
1494 // Validate arguments provided by the application
1495 if(!params->appname || !*params->appname) {
1496 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1497 meshlink_errno = MESHLINK_EINVAL;
1501 if(strchr(params->appname, ' ')) {
1502 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1503 meshlink_errno = MESHLINK_EINVAL;
1507 if(params->name && !check_id(params->name)) {
1508 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1509 meshlink_errno = MESHLINK_EINVAL;
1513 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1514 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1515 meshlink_errno = MESHLINK_EINVAL;
1519 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1520 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1521 meshlink_errno = MESHLINK_EINVAL;
1525 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1527 if(params->confbase) {
1528 mesh->confbase = xstrdup(params->confbase);
1531 mesh->appname = xstrdup(params->appname);
1532 mesh->devclass = params->devclass;
1533 mesh->discovery.enabled = true;
1534 mesh->invitation_timeout = 604800; // 1 week
1535 mesh->netns = params->netns;
1536 mesh->submeshes = NULL;
1537 mesh->log_cb = global_log_cb;
1538 mesh->log_level = global_log_level;
1539 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1541 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1544 randomize(&mesh->session_id, sizeof(mesh->session_id));
1545 } while(mesh->session_id == 0);
1547 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1549 mesh->name = params->name ? xstrdup(params->name) : NULL;
1553 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1555 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1556 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1557 meshlink_close(mesh);
1558 meshlink_errno = MESHLINK_EINTERNAL;
1563 // initialize mutexes and conds
1564 pthread_mutexattr_t attr;
1565 pthread_mutexattr_init(&attr);
1567 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1571 pthread_mutex_init(&mesh->mutex, &attr);
1572 pthread_cond_init(&mesh->cond, NULL);
1574 pthread_cond_init(&mesh->adns_cond, NULL);
1576 mesh->threadstarted = false;
1577 event_loop_init(&mesh->loop);
1578 mesh->loop.data = mesh;
1580 meshlink_queue_init(&mesh->outpacketqueue);
1582 // Atomically lock the configuration directory.
1583 if(!main_config_lock(mesh, params->lock_filename)) {
1584 meshlink_close(mesh);
1588 // If no configuration exists yet, create it.
1590 bool new_configuration = false;
1592 if(!meshlink_confbase_exists(mesh)) {
1594 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1595 meshlink_close(mesh);
1596 meshlink_errno = MESHLINK_ESTORAGE;
1600 if(!meshlink_setup(mesh)) {
1601 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1602 meshlink_close(mesh);
1606 new_configuration = true;
1608 if(!meshlink_read_config(mesh)) {
1609 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1610 meshlink_close(mesh);
1615 mesh->storage_policy = params->storage_policy;
1618 struct WSAData wsa_state;
1619 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1622 // Setup up everything
1623 // TODO: we should not open listening sockets yet
1625 bool success = false;
1627 if(mesh->netns != -1) {
1631 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1632 void *retval = NULL;
1633 success = pthread_join(thr, &retval) == 0 && retval;
1637 meshlink_errno = MESHLINK_EINTERNAL;
1640 #endif // HAVE_SETNS
1642 success = setup_network(mesh);
1646 meshlink_close(mesh);
1647 meshlink_errno = MESHLINK_ENETWORK;
1651 add_local_addresses(mesh);
1653 if(!node_write_config(mesh, mesh->self, new_configuration)) {
1654 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1658 idle_set(&mesh->loop, idle, mesh);
1660 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1664 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1665 logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh);
1667 meshlink_submesh_t *s = NULL;
1670 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1671 meshlink_errno = MESHLINK_EINVAL;
1675 if(!submesh || !*submesh) {
1676 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1677 meshlink_errno = MESHLINK_EINVAL;
1682 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1686 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1688 pthread_mutex_unlock(&mesh->mutex);
1693 static void *meshlink_main_loop(void *arg) {
1694 meshlink_handle_t *mesh = arg;
1696 if(mesh->netns != -1) {
1699 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1700 pthread_cond_signal(&mesh->cond);
1705 pthread_cond_signal(&mesh->cond);
1707 #endif // HAVE_SETNS
1710 if(mesh->discovery.enabled) {
1711 discovery_start(mesh);
1714 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1718 if(mesh->thread_status_cb) {
1719 mesh->thread_status_cb(mesh, true);
1722 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1723 pthread_cond_broadcast(&mesh->cond);
1725 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1727 if(mesh->thread_status_cb) {
1728 mesh->thread_status_cb(mesh, false);
1731 pthread_mutex_unlock(&mesh->mutex);
1734 if(mesh->discovery.enabled) {
1735 discovery_stop(mesh);
1741 bool meshlink_start(meshlink_handle_t *mesh) {
1743 meshlink_errno = MESHLINK_EINVAL;
1747 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1749 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1754 assert(mesh->private_key);
1755 assert(mesh->self->ecdsa);
1756 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1758 if(mesh->threadstarted) {
1759 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1760 pthread_mutex_unlock(&mesh->mutex);
1764 if(mesh->listen_socket[0].tcp.fd < 0) {
1765 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1766 meshlink_errno = MESHLINK_ENETWORK;
1770 // Reset node connection timers
1771 for splay_each(node_t, n, mesh->nodes) {
1772 n->last_connect_try = 0;
1775 // TODO: open listening sockets first
1777 //Check that a valid name is set
1779 logger(mesh, MESHLINK_ERROR, "No name given!\n");
1780 meshlink_errno = MESHLINK_EINVAL;
1781 pthread_mutex_unlock(&mesh->mutex);
1785 init_outgoings(mesh);
1788 // Start the main thread
1790 event_loop_start(&mesh->loop);
1792 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1793 pthread_attr_t attr;
1794 pthread_attr_init(&attr);
1795 pthread_attr_setstacksize(&attr, 1024 * 1024);
1797 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1798 logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno));
1799 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1800 meshlink_errno = MESHLINK_EINTERNAL;
1801 event_loop_stop(&mesh->loop);
1802 pthread_mutex_unlock(&mesh->mutex);
1806 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1807 mesh->threadstarted = true;
1809 // Ensure we are considered reachable
1812 pthread_mutex_unlock(&mesh->mutex);
1816 void meshlink_stop(meshlink_handle_t *mesh) {
1817 logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n");
1820 meshlink_errno = MESHLINK_EINVAL;
1824 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1828 // Shut down the main thread
1829 event_loop_stop(&mesh->loop);
1831 // Send ourselves a UDP packet to kick the event loop
1832 for(int i = 0; i < mesh->listen_sockets; i++) {
1834 socklen_t salen = sizeof(sa);
1836 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1837 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1841 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1842 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1846 if(mesh->threadstarted) {
1847 // Wait for the main thread to finish
1848 pthread_mutex_unlock(&mesh->mutex);
1850 if(pthread_join(mesh->thread, NULL) != 0) {
1854 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1858 mesh->threadstarted = false;
1861 // Close all metaconnections
1862 if(mesh->connections) {
1863 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1865 connection_t *c = node->data;
1867 terminate_connection(mesh, c, false);
1872 exit_outgoings(mesh);
1874 // Ensure we are considered unreachable
1879 // Try to write out any changed node config files, ignore errors at this point.
1881 for splay_each(node_t, n, mesh->nodes) {
1882 if(n->status.dirty) {
1883 if(!node_write_config(mesh, n, false)) {
1890 pthread_mutex_unlock(&mesh->mutex);
1893 void meshlink_close(meshlink_handle_t *mesh) {
1894 logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n");
1897 meshlink_errno = MESHLINK_EINVAL;
1901 // stop can be called even if mesh has not been started
1902 meshlink_stop(mesh);
1904 // lock is not released after this
1905 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1909 // Close and free all resources used.
1911 close_network_connections(mesh);
1913 logger(mesh, MESHLINK_INFO, "Terminating");
1915 event_loop_exit(&mesh->loop);
1919 if(mesh->confbase) {
1925 ecdsa_free(mesh->invitation_key);
1927 if(mesh->netns != -1) {
1931 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1935 meshlink_queue_exit(&mesh->outpacketqueue);
1938 free(mesh->appname);
1939 free(mesh->confbase);
1940 free(mesh->config_key);
1941 free(mesh->external_address_url);
1943 ecdsa_free(mesh->private_key);
1945 if(mesh->invitation_addresses) {
1946 list_delete_list(mesh->invitation_addresses);
1949 main_config_unlock(mesh);
1951 pthread_mutex_unlock(&mesh->mutex);
1952 pthread_mutex_destroy(&mesh->mutex);
1954 memset(mesh, 0, sizeof(*mesh));
1959 bool meshlink_destroy_ex(const meshlink_open_params_t *params) {
1960 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n");
1963 meshlink_errno = MESHLINK_EINVAL;
1967 if(!params->confbase) {
1968 /* Ephemeral instances */
1972 /* Exit early if the confbase directory itself doesn't exist */
1973 if(access(params->confbase, F_OK) && errno == ENOENT) {
1977 /* Take the lock the same way meshlink_open() would. */
1978 FILE *lockfile = fopen(params->lock_filename, "w+");
1981 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno));
1982 meshlink_errno = MESHLINK_ESTORAGE;
1987 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1991 // TODO: use _locking()?
1994 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1995 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename);
1997 meshlink_errno = MESHLINK_EBUSY;
2003 if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) {
2004 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno));
2008 if(unlink(params->lock_filename)) {
2009 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno));
2011 meshlink_errno = MESHLINK_ESTORAGE;
2017 if(!sync_path(params->confbase)) {
2018 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno));
2019 meshlink_errno = MESHLINK_ESTORAGE;
2026 bool meshlink_destroy(const char *confbase) {
2027 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase);
2029 char lock_filename[PATH_MAX];
2030 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
2032 meshlink_open_params_t params = {
2033 .confbase = (char *)confbase,
2034 .lock_filename = lock_filename,
2037 return meshlink_destroy_ex(¶ms);
2040 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
2041 logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb);
2044 meshlink_errno = MESHLINK_EINVAL;
2048 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2052 mesh->receive_cb = cb;
2053 pthread_mutex_unlock(&mesh->mutex);
2056 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
2057 logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb);
2060 meshlink_errno = MESHLINK_EINVAL;
2064 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2068 mesh->connection_try_cb = cb;
2069 pthread_mutex_unlock(&mesh->mutex);
2072 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
2073 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb);
2076 meshlink_errno = MESHLINK_EINVAL;
2080 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2084 mesh->node_status_cb = cb;
2085 pthread_mutex_unlock(&mesh->mutex);
2088 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
2089 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb);
2092 meshlink_errno = MESHLINK_EINVAL;
2096 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2100 mesh->node_pmtu_cb = cb;
2101 pthread_mutex_unlock(&mesh->mutex);
2104 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
2105 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb);
2108 meshlink_errno = MESHLINK_EINVAL;
2112 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2116 mesh->node_duplicate_cb = cb;
2117 pthread_mutex_unlock(&mesh->mutex);
2120 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
2121 logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb);
2124 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2129 mesh->log_level = cb ? level : 0;
2130 pthread_mutex_unlock(&mesh->mutex);
2133 global_log_level = cb ? level : 0;
2137 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2138 logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb);
2141 meshlink_errno = MESHLINK_EINVAL;
2145 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2149 mesh->error_cb = cb;
2150 pthread_mutex_unlock(&mesh->mutex);
2153 void meshlink_set_blacklisted_cb(struct meshlink_handle *mesh, meshlink_blacklisted_cb_t cb) {
2154 logger(mesh, MESHLINK_DEBUG, "meshlink_set_blacklisted_cb(%p)", (void *)(intptr_t)cb);
2157 meshlink_errno = MESHLINK_EINVAL;
2161 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2165 mesh->blacklisted_cb = cb;
2166 pthread_mutex_unlock(&mesh->mutex);
2169 void meshlink_set_thread_status_cb(struct meshlink_handle *mesh, meshlink_thread_status_cb_t cb) {
2170 logger(mesh, MESHLINK_DEBUG, "meshlink_set_thread_status_cb(%p)", (void *)(intptr_t)cb);
2173 meshlink_errno = MESHLINK_EINVAL;
2177 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2181 mesh->thread_status_cb = cb;
2182 pthread_mutex_unlock(&mesh->mutex);
2185 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2186 meshlink_packethdr_t *hdr;
2188 if(len > MAXSIZE - sizeof(*hdr)) {
2189 meshlink_errno = MESHLINK_EINVAL;
2193 node_t *n = (node_t *)destination;
2195 if(n->status.blacklisted) {
2196 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2197 meshlink_errno = MESHLINK_EBLACKLISTED;
2201 // Prepare the packet
2202 packet->probe = false;
2203 packet->len = len + sizeof(*hdr);
2205 hdr = (meshlink_packethdr_t *)packet->data;
2206 memset(hdr, 0, sizeof(*hdr));
2207 // leave the last byte as 0 to make sure strings are always
2208 // null-terminated if they are longer than the buffer
2209 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2210 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2212 memcpy(packet->data + sizeof(*hdr), data, len);
2217 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2219 assert(destination);
2223 // Prepare the packet
2224 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2228 // Send it immediately
2229 route(mesh, mesh->self, mesh->packet);
2234 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2235 logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len);
2237 // Validate arguments
2238 if(!mesh || !destination) {
2239 meshlink_errno = MESHLINK_EINVAL;
2248 meshlink_errno = MESHLINK_EINVAL;
2252 // Prepare the packet
2253 vpn_packet_t *packet = malloc(sizeof(*packet));
2256 meshlink_errno = MESHLINK_ENOMEM;
2260 if(!prepare_packet(mesh, destination, data, len, packet)) {
2266 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2268 meshlink_errno = MESHLINK_ENOMEM;
2272 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2274 // Notify event loop
2275 signal_trigger(&mesh->loop, &mesh->datafromapp);
2280 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2282 meshlink_handle_t *mesh = data;
2284 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2286 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2287 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2288 route(mesh, mesh->self, packet);
2293 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2294 if(!mesh || !destination) {
2295 meshlink_errno = MESHLINK_EINVAL;
2299 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2303 node_t *n = (node_t *)destination;
2305 if(!n->status.reachable) {
2306 pthread_mutex_unlock(&mesh->mutex);
2309 } else if(n->mtuprobes > 30 && n->minmtu) {
2310 pthread_mutex_unlock(&mesh->mutex);
2313 pthread_mutex_unlock(&mesh->mutex);
2318 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2319 if(!mesh || !node) {
2320 meshlink_errno = MESHLINK_EINVAL;
2324 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2328 node_t *n = (node_t *)node;
2330 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2331 meshlink_errno = MESHLINK_EINTERNAL;
2332 pthread_mutex_unlock(&mesh->mutex);
2336 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2339 meshlink_errno = MESHLINK_EINTERNAL;
2342 pthread_mutex_unlock(&mesh->mutex);
2346 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2348 meshlink_errno = MESHLINK_EINVAL;
2352 return (meshlink_node_t *)mesh->self;
2355 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2356 if(!mesh || !name) {
2357 meshlink_errno = MESHLINK_EINVAL;
2363 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2367 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2368 pthread_mutex_unlock(&mesh->mutex);
2371 meshlink_errno = MESHLINK_ENOENT;
2374 return (meshlink_node_t *)n;
2377 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2378 if(!mesh || !name) {
2379 meshlink_errno = MESHLINK_EINVAL;
2383 meshlink_submesh_t *submesh = NULL;
2385 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2389 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2390 pthread_mutex_unlock(&mesh->mutex);
2393 meshlink_errno = MESHLINK_ENOENT;
2399 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2400 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2401 meshlink_errno = MESHLINK_EINVAL;
2405 meshlink_node_t **result;
2408 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2412 *nmemb = mesh->nodes->count;
2413 result = realloc(nodes, *nmemb * sizeof(*nodes));
2416 meshlink_node_t **p = result;
2418 for splay_each(node_t, n, mesh->nodes) {
2419 *p++ = (meshlink_node_t *)n;
2424 meshlink_errno = MESHLINK_ENOMEM;
2427 pthread_mutex_unlock(&mesh->mutex);
2432 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) {
2433 meshlink_node_t **result;
2435 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2441 for splay_each(node_t, n, mesh->nodes) {
2442 if(search_node(n, condition)) {
2449 pthread_mutex_unlock(&mesh->mutex);
2453 result = realloc(nodes, *nmemb * sizeof(*nodes));
2456 meshlink_node_t **p = result;
2458 for splay_each(node_t, n, mesh->nodes) {
2459 if(search_node(n, condition)) {
2460 *p++ = (meshlink_node_t *)n;
2466 meshlink_errno = MESHLINK_ENOMEM;
2469 pthread_mutex_unlock(&mesh->mutex);
2474 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2475 dev_class_t *devclass = (dev_class_t *)condition;
2477 if(*devclass == (dev_class_t)node->devclass) {
2484 static bool search_node_by_blacklisted(const node_t *node, const void *condition) {
2485 return *(bool *)condition == node->status.blacklisted;
2488 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2489 if(condition == node->submesh) {
2501 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2502 const struct time_range *range = condition;
2503 time_t start = node->last_reachable;
2504 time_t end = node->last_unreachable;
2514 if(range->end >= range->start) {
2515 return start <= range->end && end >= range->start;
2517 return start > range->start || end < range->end;
2521 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) {
2522 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2523 meshlink_errno = MESHLINK_EINVAL;
2527 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2530 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2531 if(!mesh || !submesh || !nmemb) {
2532 meshlink_errno = MESHLINK_EINVAL;
2536 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2539 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) {
2540 if(!mesh || !nmemb) {
2541 meshlink_errno = MESHLINK_EINVAL;
2545 struct time_range range = {start, end};
2547 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2550 meshlink_node_t **meshlink_get_all_nodes_by_blacklisted(meshlink_handle_t *mesh, bool blacklisted, meshlink_node_t **nodes, size_t *nmemb) {
2551 if(!mesh || !nmemb) {
2552 meshlink_errno = MESHLINK_EINVAL;
2556 return meshlink_get_all_nodes_by_condition(mesh, &blacklisted, nodes, nmemb, search_node_by_blacklisted);
2559 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2560 if(!mesh || !node) {
2561 meshlink_errno = MESHLINK_EINVAL;
2565 dev_class_t devclass;
2567 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2571 devclass = ((node_t *)node)->devclass;
2573 pthread_mutex_unlock(&mesh->mutex);
2578 bool meshlink_get_node_tiny(meshlink_handle_t *mesh, meshlink_node_t *node) {
2579 if(!mesh || !node) {
2580 meshlink_errno = MESHLINK_EINVAL;
2586 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2590 tiny = ((node_t *)node)->status.tiny;
2592 pthread_mutex_unlock(&mesh->mutex);
2597 bool meshlink_get_node_blacklisted(meshlink_handle_t *mesh, meshlink_node_t *node) {
2599 meshlink_errno = MESHLINK_EINVAL;
2603 return mesh->default_blacklist;
2608 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2612 blacklisted = ((node_t *)node)->status.blacklisted;
2614 pthread_mutex_unlock(&mesh->mutex);
2619 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2620 if(!mesh || !node) {
2621 meshlink_errno = MESHLINK_EINVAL;
2625 node_t *n = (node_t *)node;
2627 meshlink_submesh_t *s;
2629 s = (meshlink_submesh_t *)n->submesh;
2634 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2635 if(!mesh || !node) {
2636 meshlink_errno = MESHLINK_EINVAL;
2640 node_t *n = (node_t *)node;
2643 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2647 reachable = n->status.reachable && !n->status.blacklisted;
2649 if(last_reachable) {
2650 *last_reachable = n->last_reachable;
2653 if(last_unreachable) {
2654 *last_unreachable = n->last_unreachable;
2657 pthread_mutex_unlock(&mesh->mutex);
2662 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2663 logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen);
2665 if(!mesh || !data || !len || !signature || !siglen) {
2666 meshlink_errno = MESHLINK_EINVAL;
2670 if(*siglen < MESHLINK_SIGLEN) {
2671 meshlink_errno = MESHLINK_EINVAL;
2675 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2679 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2680 meshlink_errno = MESHLINK_EINTERNAL;
2681 pthread_mutex_unlock(&mesh->mutex);
2685 *siglen = MESHLINK_SIGLEN;
2686 pthread_mutex_unlock(&mesh->mutex);
2690 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2691 logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen);
2693 if(!mesh || !source || !data || !len || !signature) {
2694 meshlink_errno = MESHLINK_EINVAL;
2698 if(siglen != MESHLINK_SIGLEN) {
2699 meshlink_errno = MESHLINK_EINVAL;
2703 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2709 struct node_t *n = (struct node_t *)source;
2711 if(!node_read_public_key(mesh, n)) {
2712 meshlink_errno = MESHLINK_EINTERNAL;
2715 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2718 pthread_mutex_unlock(&mesh->mutex);
2722 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2723 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2727 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2730 // TODO: Update invitation key if necessary?
2733 pthread_mutex_unlock(&mesh->mutex);
2735 return mesh->invitation_key;
2738 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2739 logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)");
2741 if(!mesh || !node || !address) {
2742 meshlink_errno = MESHLINK_EINVAL;
2746 if(!is_valid_hostname(address)) {
2747 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address);
2748 meshlink_errno = MESHLINK_EINVAL;
2752 if((node_t *)node != mesh->self && !port) {
2753 logger(mesh, MESHLINK_ERROR, "Missing port number!");
2754 meshlink_errno = MESHLINK_EINVAL;
2759 if(port && !is_valid_port(port)) {
2760 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address);
2761 meshlink_errno = MESHLINK_EINVAL;
2765 char *canonical_address;
2767 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2769 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2773 node_t *n = (node_t *)node;
2774 free(n->canonical_address);
2775 n->canonical_address = canonical_address;
2777 if(!node_write_config(mesh, n, false)) {
2778 pthread_mutex_unlock(&mesh->mutex);
2782 pthread_mutex_unlock(&mesh->mutex);
2784 return config_sync(mesh, "current");
2787 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2788 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)");
2790 if(!mesh || !node) {
2791 meshlink_errno = MESHLINK_EINVAL;
2795 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2799 node_t *n = (node_t *)node;
2800 free(n->canonical_address);
2801 n->canonical_address = NULL;
2803 if(!node_write_config(mesh, n, false)) {
2804 pthread_mutex_unlock(&mesh->mutex);
2808 pthread_mutex_unlock(&mesh->mutex);
2810 return config_sync(mesh, "current");
2813 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2814 logger(mesh, MESHLINK_DEBUG, "meshlink_add_invitation_address(%s, %s)", address ? address : "(null)", port ? port : "(null)");
2816 if(!mesh || !address) {
2817 meshlink_errno = MESHLINK_EINVAL;
2821 if(!is_valid_hostname(address)) {
2822 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s\n", address);
2823 meshlink_errno = MESHLINK_EINVAL;
2827 if(port && !is_valid_port(port)) {
2828 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s\n", address);
2829 meshlink_errno = MESHLINK_EINVAL;
2836 xasprintf(&combo, "%s/%s", address, port);
2838 combo = xstrdup(address);
2841 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2845 if(!mesh->invitation_addresses) {
2846 mesh->invitation_addresses = list_alloc((list_action_t)free);
2849 list_insert_tail(mesh->invitation_addresses, combo);
2850 pthread_mutex_unlock(&mesh->mutex);
2855 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2856 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_invitation_addresses()");
2859 meshlink_errno = MESHLINK_EINVAL;
2863 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2867 if(mesh->invitation_addresses) {
2868 list_delete_list(mesh->invitation_addresses);
2869 mesh->invitation_addresses = NULL;
2872 pthread_mutex_unlock(&mesh->mutex);
2875 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2876 logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)");
2878 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2881 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2882 logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()");
2885 meshlink_errno = MESHLINK_EINVAL;
2889 char *address = meshlink_get_external_address(mesh);
2895 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2901 int meshlink_get_port(meshlink_handle_t *mesh) {
2903 meshlink_errno = MESHLINK_EINVAL;
2908 meshlink_errno = MESHLINK_EINTERNAL;
2914 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2918 port = atoi(mesh->myport);
2919 pthread_mutex_unlock(&mesh->mutex);
2924 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2925 logger(mesh, MESHLINK_DEBUG, "meshlink_set_port(%d)", port);
2927 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2928 meshlink_errno = MESHLINK_EINVAL;
2932 if(mesh->myport && port == atoi(mesh->myport)) {
2936 if(!try_bind(mesh, port)) {
2937 meshlink_errno = MESHLINK_ENETWORK;
2941 devtool_trybind_probe();
2945 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2949 if(mesh->threadstarted) {
2950 meshlink_errno = MESHLINK_EINVAL;
2955 xasprintf(&mesh->myport, "%d", port);
2957 /* Close down the network. This also deletes mesh->self. */
2958 close_network_connections(mesh);
2960 /* Recreate mesh->self. */
2961 mesh->self = new_node();
2962 mesh->self->name = xstrdup(mesh->name);
2963 mesh->self->devclass = mesh->devclass;
2964 mesh->self->session_id = mesh->session_id;
2965 xasprintf(&mesh->myport, "%d", port);
2967 if(!node_read_public_key(mesh, mesh->self)) {
2968 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2969 meshlink_errno = MESHLINK_ESTORAGE;
2970 free_node(mesh->self);
2973 } else if(!setup_network(mesh)) {
2974 meshlink_errno = MESHLINK_ENETWORK;
2978 /* Rebuild our own list of recent addresses */
2979 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2980 add_local_addresses(mesh);
2982 /* Write meshlink.conf with the updated port number */
2983 write_main_config_files(mesh);
2985 rval = config_sync(mesh, "current");
2988 pthread_mutex_unlock(&mesh->mutex);
2990 return rval && meshlink_get_port(mesh) == port;
2993 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2994 logger(mesh, MESHLINK_DEBUG, "meshlink_invitation_timeout(%d)", timeout);
2996 mesh->invitation_timeout = timeout;
2999 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
3000 logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s, %u)", submesh ? submesh->name : "(null)", name ? name : "(null)", flags);
3002 meshlink_submesh_t *s = NULL;
3005 meshlink_errno = MESHLINK_EINVAL;
3010 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
3013 logger(mesh, MESHLINK_ERROR, "Invalid submesh handle.\n");
3014 meshlink_errno = MESHLINK_EINVAL;
3018 s = (meshlink_submesh_t *)mesh->self->submesh;
3021 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3025 // Check validity of the new node's name
3026 if(!check_id(name)) {
3027 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
3028 meshlink_errno = MESHLINK_EINVAL;
3029 pthread_mutex_unlock(&mesh->mutex);
3033 // Ensure no host configuration file with that name exists
3034 if(config_exists(mesh, "current", name)) {
3035 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
3036 meshlink_errno = MESHLINK_EEXIST;
3037 pthread_mutex_unlock(&mesh->mutex);
3041 // Ensure no other nodes know about this name
3042 if(lookup_node(mesh, name)) {
3043 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
3044 meshlink_errno = MESHLINK_EEXIST;
3045 pthread_mutex_unlock(&mesh->mutex);
3049 // Get the local address
3050 char *address = get_my_hostname(mesh, flags);
3053 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
3054 meshlink_errno = MESHLINK_ERESOLV;
3055 pthread_mutex_unlock(&mesh->mutex);
3059 if(!refresh_invitation_key(mesh)) {
3060 meshlink_errno = MESHLINK_EINTERNAL;
3061 pthread_mutex_unlock(&mesh->mutex);
3065 // If we changed our own host config file, write it out now
3066 if(mesh->self->status.dirty) {
3067 if(!node_write_config(mesh, mesh->self, false)) {
3068 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
3069 pthread_mutex_unlock(&mesh->mutex);
3076 // Create a hash of the key.
3077 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
3078 sha512(fingerprint, strlen(fingerprint), hash);
3079 b64encode_urlsafe(hash, hash, 18);
3081 // Create a random cookie for this invitation.
3083 randomize(cookie, 18);
3085 // Create a filename that doesn't reveal the cookie itself
3086 char buf[18 + strlen(fingerprint)];
3087 char cookiehash[64];
3088 memcpy(buf, cookie, 18);
3089 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
3090 sha512(buf, sizeof(buf), cookiehash);
3091 b64encode_urlsafe(cookiehash, cookiehash, 18);
3093 b64encode_urlsafe(cookie, cookie, 18);
3097 /* Construct the invitation file */
3098 uint8_t outbuf[4096];
3099 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
3101 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
3102 packmsg_add_str(&inv, name);
3103 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
3104 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
3106 /* TODO: Add several host config files to bootstrap connections.
3107 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
3108 * and are not blacklisted.
3110 config_t configs[5];
3111 memset(configs, 0, sizeof(configs));
3114 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
3118 /* Append host config files to the invitation file */
3119 packmsg_add_array(&inv, count);
3121 for(int i = 0; i < count; i++) {
3122 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
3123 config_free(&configs[i]);
3126 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
3128 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
3129 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
3130 meshlink_errno = MESHLINK_ESTORAGE;
3131 pthread_mutex_unlock(&mesh->mutex);
3135 // Create an URL from the local address, key hash and cookie
3137 xasprintf(&url, "%s/%s%s", address, hash, cookie);
3140 pthread_mutex_unlock(&mesh->mutex);
3144 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
3145 logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s)", submesh ? submesh->name : "(null)", name ? name : "(null)");
3147 return meshlink_invite_ex(mesh, submesh, name, 0);
3150 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
3151 logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)");
3153 if(!mesh || !invitation) {
3154 meshlink_errno = MESHLINK_EINVAL;
3158 if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) {
3159 meshlink_errno = MESHLINK_EINVAL;
3163 join_state_t state = {
3168 ecdsa_t *key = NULL;
3169 ecdsa_t *hiskey = NULL;
3171 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
3172 char copy[strlen(invitation) + 1];
3174 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3178 //Before doing meshlink_join make sure we are not connected to another mesh
3179 if(mesh->threadstarted) {
3180 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
3181 meshlink_errno = MESHLINK_EINVAL;
3185 // 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.
3186 if(mesh->nodes->count > 1) {
3187 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
3188 meshlink_errno = MESHLINK_EINVAL;
3192 strcpy(copy, invitation);
3194 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
3196 char *slash = strchr(copy, '/');
3204 if(strlen(slash) != 48) {
3208 char *address = copy;
3211 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
3215 if(mesh->inviter_commits_first) {
3216 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
3219 // Generate a throw-away key for the invitation.
3220 key = ecdsa_generate();
3223 meshlink_errno = MESHLINK_EINTERNAL;
3227 char *b64key = ecdsa_get_base64_public_key(key);
3230 while(address && *address) {
3231 // We allow commas in the address part to support multiple addresses in one invitation URL.
3232 comma = strchr(address, ',');
3238 // Split of the port
3239 port = strrchr(address, ':');
3247 // IPv6 address are enclosed in brackets, per RFC 3986
3248 if(*address == '[') {
3250 char *bracket = strchr(address, ']');
3263 // Connect to the meshlink daemon mentioned in the URL.
3264 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 30);
3267 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
3268 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
3270 if(state.sock == -1) {
3271 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
3272 meshlink_errno = MESHLINK_ENETWORK;
3278 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3281 set_timeout(state.sock, 5000);
3283 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3284 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3285 meshlink_errno = MESHLINK_ENETWORK;
3286 closesocket(state.sock);
3296 meshlink_errno = MESHLINK_ERESOLV;
3299 if(state.sock != -1 || !comma) {
3306 if(state.sock == -1) {
3310 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3312 // Tell him we have an invitation, and give him our throw-away key.
3316 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3317 logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3318 meshlink_errno = MESHLINK_ENETWORK;
3324 char hisname[4096] = "";
3325 int code, hismajor, hisminor = 0;
3327 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) {
3328 logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n");
3329 meshlink_errno = MESHLINK_ENETWORK;
3333 // Check if the hash of the key he gave us matches the hash in the URL.
3334 char *fingerprint = state.line + 2;
3337 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3338 logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2);
3339 meshlink_errno = MESHLINK_EINTERNAL;
3343 if(memcmp(hishash, state.hash, 18)) {
3344 logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2);
3345 meshlink_errno = MESHLINK_EPEER;
3349 hiskey = ecdsa_set_base64_public_key(fingerprint);
3352 meshlink_errno = MESHLINK_EINTERNAL;
3356 // Start an SPTPS session
3357 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3358 meshlink_errno = MESHLINK_EINTERNAL;
3362 // Feed rest of input buffer to SPTPS
3363 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3364 meshlink_errno = MESHLINK_EPEER;
3369 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3371 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3373 if(errno == EINTR) {
3377 logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3378 meshlink_errno = MESHLINK_ENETWORK;
3382 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3383 meshlink_errno = MESHLINK_EPEER;
3388 if(!state.success) {
3389 logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n");
3390 meshlink_errno = MESHLINK_EPEER;
3394 sptps_stop(&state.sptps);
3397 closesocket(state.sock);
3399 pthread_mutex_unlock(&mesh->mutex);
3403 logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n");
3404 meshlink_errno = MESHLINK_EINVAL;
3406 sptps_stop(&state.sptps);
3410 if(state.sock != -1) {
3411 closesocket(state.sock);
3414 pthread_mutex_unlock(&mesh->mutex);
3418 char *meshlink_export(meshlink_handle_t *mesh) {
3420 meshlink_errno = MESHLINK_EINVAL;
3424 // Create a config file on the fly.
3427 packmsg_output_t out = {buf, sizeof(buf)};
3428 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3429 packmsg_add_str(&out, mesh->name);
3430 packmsg_add_str(&out, CORE_MESH);
3432 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3436 packmsg_add_int32(&out, mesh->self->devclass);
3437 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3438 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3440 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3441 char *canonical_address = NULL;
3442 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3443 packmsg_add_str(&out, canonical_address);
3444 free(canonical_address);
3446 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3451 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3452 if(mesh->self->recent[i].sa.sa_family) {
3459 packmsg_add_array(&out, count);
3461 for(uint32_t i = 0; i < count; i++) {
3462 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3465 packmsg_add_int64(&out, 0);
3466 packmsg_add_int64(&out, 0);
3468 pthread_mutex_unlock(&mesh->mutex);
3470 if(!packmsg_output_ok(&out)) {
3471 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
3472 meshlink_errno = MESHLINK_EINTERNAL;
3476 // Prepare a base64-encoded packmsg array containing our config file
3478 uint32_t len = packmsg_output_size(&out, buf);
3479 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3480 uint8_t *buf2 = xmalloc(len2);
3481 packmsg_output_t out2 = {buf2, len2};
3482 packmsg_add_array(&out2, 1);
3483 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3485 if(!packmsg_output_ok(&out2)) {
3486 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
3487 meshlink_errno = MESHLINK_EINTERNAL;
3492 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3494 return (char *)buf2;
3497 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3498 logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data);
3500 if(!mesh || !data) {
3501 meshlink_errno = MESHLINK_EINVAL;
3505 size_t datalen = strlen(data);
3506 uint8_t *buf = xmalloc(datalen);
3507 int buflen = b64decode(data, buf, datalen);
3510 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3512 meshlink_errno = MESHLINK_EPEER;
3516 packmsg_input_t in = {buf, buflen};
3517 uint32_t count = packmsg_get_array(&in);
3520 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3522 meshlink_errno = MESHLINK_EPEER;
3526 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3532 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3538 packmsg_input_t in2 = {data2, len2};
3539 uint32_t version = packmsg_get_uint32(&in2);
3540 char *name = packmsg_get_str_dup(&in2);
3542 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3544 packmsg_input_invalidate(&in);
3548 if(!check_id(name)) {
3553 node_t *n = lookup_node(mesh, name);
3556 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3564 config_t config = {data2, len2};
3566 if(!node_read_from_config(mesh, n, &config)) {
3568 packmsg_input_invalidate(&in);
3572 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3573 n->last_reachable = 0;
3574 n->last_unreachable = 0;
3576 if(!node_write_config(mesh, n, true)) {
3585 pthread_mutex_unlock(&mesh->mutex);
3589 if(!packmsg_done(&in)) {
3590 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3591 meshlink_errno = MESHLINK_EPEER;
3595 if(!config_sync(mesh, "current")) {
3602 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3603 if(n == mesh->self) {
3604 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3605 meshlink_errno = MESHLINK_EINVAL;
3609 if(n->status.blacklisted) {
3610 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3614 n->status.blacklisted = true;
3616 /* Immediately shut down any connections we have with the blacklisted node.
3617 * We can't call terminate_connection(), because we might be called from a callback function.
3619 for list_each(connection_t, c, mesh->connections) {
3621 if(c->status.active) {
3622 send_error(mesh, c, BLACKLISTED, "blacklisted");
3625 shutdown(c->socket, SHUT_RDWR);
3629 utcp_reset_all_connections(n->utcp);
3635 n->status.udp_confirmed = false;
3637 if(n->status.reachable) {
3638 n->last_unreachable = time(NULL);
3641 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3642 * manually call the status callback if necessary.
3644 if(n->status.reachable && mesh->node_status_cb) {
3645 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3648 /* Remove any outstanding invitations */
3649 invitation_purge_node(mesh, n->name);
3651 return node_write_config(mesh, n, true) && config_sync(mesh, "current");
3654 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3655 logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist(%s)", node ? node->name : "(null)");
3657 if(!mesh || !node) {
3658 meshlink_errno = MESHLINK_EINVAL;
3662 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3666 if(!blacklist(mesh, (node_t *)node)) {
3667 pthread_mutex_unlock(&mesh->mutex);
3671 pthread_mutex_unlock(&mesh->mutex);
3673 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3677 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3678 logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist_by_name(%s)", name ? name : "(null)");
3680 if(!mesh || !name) {
3681 meshlink_errno = MESHLINK_EINVAL;
3685 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3689 node_t *n = lookup_node(mesh, (char *)name);
3693 n->name = xstrdup(name);
3697 if(!blacklist(mesh, (node_t *)n)) {
3698 pthread_mutex_unlock(&mesh->mutex);
3702 pthread_mutex_unlock(&mesh->mutex);
3704 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3708 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3709 if(n == mesh->self) {
3710 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3711 meshlink_errno = MESHLINK_EINVAL;
3715 if(!n->status.blacklisted) {
3716 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3720 n->status.blacklisted = false;
3722 if(n->status.reachable) {
3723 n->last_reachable = time(NULL);
3724 update_node_status(mesh, n);
3727 return node_write_config(mesh, n, true) && config_sync(mesh, "current");
3730 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3731 logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist(%s)", node ? node->name : "(null)");
3733 if(!mesh || !node) {
3734 meshlink_errno = MESHLINK_EINVAL;
3738 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3742 if(!whitelist(mesh, (node_t *)node)) {
3743 pthread_mutex_unlock(&mesh->mutex);
3747 pthread_mutex_unlock(&mesh->mutex);
3749 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3753 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3754 logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist_by_name(%s)", name ? name : "(null)");
3756 if(!mesh || !name) {
3757 meshlink_errno = MESHLINK_EINVAL;
3761 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3765 node_t *n = lookup_node(mesh, (char *)name);
3769 n->name = xstrdup(name);
3773 if(!whitelist(mesh, (node_t *)n)) {
3774 pthread_mutex_unlock(&mesh->mutex);
3778 pthread_mutex_unlock(&mesh->mutex);
3780 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3784 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3785 mesh->default_blacklist = blacklist;
3788 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3789 logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)");
3791 if(!mesh || !node) {
3792 meshlink_errno = MESHLINK_EINVAL;
3796 node_t *n = (node_t *)node;
3798 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3802 /* Check that the node is not reachable */
3803 if(n->status.reachable || n->connection) {
3804 pthread_mutex_unlock(&mesh->mutex);
3805 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3809 /* Check that we don't have any active UTCP connections */
3810 if(n->utcp && utcp_is_active(n->utcp)) {
3811 pthread_mutex_unlock(&mesh->mutex);
3812 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3816 /* Check that we have no active connections to this node */
3817 for list_each(connection_t, c, mesh->connections) {
3819 pthread_mutex_unlock(&mesh->mutex);
3820 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3825 /* Remove any pending outgoings to this node */
3826 if(mesh->outgoings) {
3827 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3828 if(outgoing->node == n) {
3829 list_delete_node(mesh->outgoings, list_node);
3834 /* Delete the config file for this node */
3835 if(!config_delete(mesh, "current", n->name)) {
3836 pthread_mutex_unlock(&mesh->mutex);
3840 /* Delete any pending invitations */
3841 invitation_purge_node(mesh, n->name);
3843 /* Delete the node struct and any remaining edges referencing this node */
3846 pthread_mutex_unlock(&mesh->mutex);
3848 return config_sync(mesh, "current");
3851 /* Hint that a hostname may be found at an address
3852 * See header file for detailed comment.
3854 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3855 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr);
3857 if(!mesh || !node || !addr) {
3858 meshlink_errno = EINVAL;
3862 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3866 node_t *n = (node_t *)node;
3868 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3869 if(!node_write_config(mesh, n, false)) {
3870 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3874 pthread_mutex_unlock(&mesh->mutex);
3875 // @TODO do we want to fire off a connection attempt right away?
3878 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3880 node_t *n = utcp->priv;
3881 meshlink_handle_t *mesh = n->mesh;
3883 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3884 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3886 return mesh->channel_accept_cb;
3890 /* Finish one AIO buffer, return true if the channel is still open. */
3891 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3892 meshlink_aio_buffer_t *aio = *head;
3896 channel->in_callback = true;
3899 if(aio->cb.buffer) {
3900 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3904 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3908 channel->in_callback = false;
3921 /* Finish all AIO buffers, return true if the channel is still open. */
3922 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3924 if(!aio_finish_one(mesh, channel, head)) {
3932 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3933 meshlink_channel_t *channel = connection->priv;
3939 node_t *n = channel->node;
3940 meshlink_handle_t *mesh = n->mesh;
3942 if(n->status.destroyed) {
3943 meshlink_channel_close(mesh, channel);
3947 const char *p = data;
3950 while(channel->aio_receive) {
3952 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3953 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3960 meshlink_aio_buffer_t *aio = channel->aio_receive;
3961 size_t todo = aio->len - aio->done;
3968 memcpy((char *)aio->data + aio->done, p, todo);
3970 ssize_t result = write(aio->fd, p, todo);
3973 if(result < 0 && errno == EINTR) {
3977 /* Writing to fd failed, cancel just this AIO buffer. */
3978 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3980 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3994 if(aio->done == aio->len) {
3995 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
4005 if(channel->receive_cb) {
4006 channel->receive_cb(mesh, channel, p, left);
4012 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
4013 node_t *n = utcp_connection->utcp->priv;
4019 meshlink_handle_t *mesh = n->mesh;
4021 if(!mesh->channel_accept_cb) {
4025 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4027 channel->c = utcp_connection;
4029 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
4030 utcp_accept(utcp_connection, channel_recv, channel);
4036 static void channel_retransmit(struct utcp_connection *utcp_connection) {
4037 node_t *n = utcp_connection->utcp->priv;
4038 meshlink_handle_t *mesh = n->mesh;
4040 if(n->mtuprobes == -1 && n->udp_ping_timeout.cb) {
4041 timeout_set(&mesh->loop, &n->udp_ping_timeout, &(struct timespec) {
4047 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
4048 node_t *n = utcp->priv;
4050 if(n->status.destroyed) {
4054 meshlink_handle_t *mesh = n->mesh;
4055 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
4058 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
4059 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
4061 if(!mesh || !channel) {
4062 meshlink_errno = MESHLINK_EINVAL;
4066 channel->receive_cb = cb;
4069 void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
4071 node_t *n = (node_t *)source;
4077 utcp_recv(n->utcp, data, len);
4080 static void channel_poll(struct utcp_connection *connection, size_t len) {
4081 meshlink_channel_t *channel = connection->priv;
4087 node_t *n = channel->node;
4088 meshlink_handle_t *mesh = n->mesh;
4090 while(channel->aio_send) {
4092 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
4093 if(!aio_abort(mesh, channel, &channel->aio_send)) {
4100 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
4101 meshlink_aio_buffer_t *aio = channel->aio_send;
4102 size_t todo = aio->len - aio->done;
4110 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
4112 /* Limit the amount we read at once to avoid stack overflows */
4118 ssize_t result = read(aio->fd, buf, todo);
4122 sent = utcp_send(connection, buf, todo);
4124 if(result < 0 && errno == EINTR) {
4128 /* Reading from fd failed, cancel just this AIO buffer. */
4130 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
4133 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
4141 if(sent != (ssize_t)todo) {
4142 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
4143 if(!aio_abort(mesh, channel, &channel->aio_send)) {
4154 /* If we didn't finish this buffer, exit early. */
4155 if(aio->done < aio->len) {
4159 /* Signal completion of this buffer, and go to the next one. */
4160 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
4169 if(channel->poll_cb) {
4170 channel->poll_cb(mesh, channel, len);
4172 utcp_set_poll_cb(connection, NULL);
4176 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
4177 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
4179 if(!mesh || !channel) {
4180 meshlink_errno = MESHLINK_EINVAL;
4184 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4188 channel->poll_cb = cb;
4189 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
4190 pthread_mutex_unlock(&mesh->mutex);
4193 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
4194 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb);
4197 meshlink_errno = MESHLINK_EINVAL;
4201 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4205 mesh->channel_listen_cb = cb;
4207 pthread_mutex_unlock(&mesh->mutex);
4210 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
4211 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb);
4214 meshlink_errno = MESHLINK_EINVAL;
4218 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4222 mesh->channel_accept_cb = cb;
4224 for splay_each(node_t, n, mesh->nodes) {
4225 if(!n->utcp && n != mesh->self) {
4226 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4227 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4228 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4232 pthread_mutex_unlock(&mesh->mutex);
4235 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4236 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
4238 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
4241 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4242 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
4244 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
4247 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4248 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
4250 if(!mesh || !channel) {
4251 meshlink_errno = MESHLINK_EINVAL;
4255 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4259 utcp_set_sndbuf(channel->c, buf, size);
4260 pthread_mutex_unlock(&mesh->mutex);
4263 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4264 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
4266 if(!mesh || !channel) {
4267 meshlink_errno = MESHLINK_EINVAL;
4271 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4275 utcp_set_rcvbuf(channel->c, buf, size);
4276 pthread_mutex_unlock(&mesh->mutex);
4279 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
4280 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
4282 if(!mesh || !channel) {
4283 meshlink_errno = MESHLINK_EINVAL;
4287 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4291 utcp_set_flags(channel->c, flags);
4292 pthread_mutex_unlock(&mesh->mutex);
4295 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) {
4296 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu, %u)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len, flags);
4299 abort(); // TODO: handle non-NULL data
4302 if(!mesh || !node) {
4303 meshlink_errno = MESHLINK_EINVAL;
4307 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4311 node_t *n = (node_t *)node;
4314 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4315 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4316 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4319 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4320 pthread_mutex_unlock(&mesh->mutex);
4325 if(n->status.blacklisted) {
4326 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
4327 meshlink_errno = MESHLINK_EBLACKLISTED;
4328 pthread_mutex_unlock(&mesh->mutex);
4332 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4334 channel->receive_cb = cb;
4337 channel->priv = (void *)data;
4340 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
4342 pthread_mutex_unlock(&mesh->mutex);
4345 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4353 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) {
4354 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len);
4356 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4359 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4360 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction);
4362 if(!mesh || !channel) {
4363 meshlink_errno = MESHLINK_EINVAL;
4367 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4371 utcp_shutdown(channel->c, direction);
4372 pthread_mutex_unlock(&mesh->mutex);
4375 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4376 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel);
4378 if(!mesh || !channel) {
4379 meshlink_errno = MESHLINK_EINVAL;
4383 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4388 utcp_close(channel->c);
4391 /* Clean up any outstanding AIO buffers. */
4392 aio_abort(mesh, channel, &channel->aio_send);
4393 aio_abort(mesh, channel, &channel->aio_receive);
4396 if(!channel->in_callback) {
4400 pthread_mutex_unlock(&mesh->mutex);
4403 void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4404 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel);
4406 if(!mesh || !channel) {
4407 meshlink_errno = MESHLINK_EINVAL;
4411 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4416 utcp_abort(channel->c);
4419 /* Clean up any outstanding AIO buffers. */
4420 aio_abort(mesh, channel, &channel->aio_send);
4421 aio_abort(mesh, channel, &channel->aio_receive);
4424 if(!channel->in_callback) {
4428 pthread_mutex_unlock(&mesh->mutex);
4431 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4432 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len);
4434 if(!mesh || !channel) {
4435 meshlink_errno = MESHLINK_EINVAL;
4444 meshlink_errno = MESHLINK_EINVAL;
4448 // TODO: more finegrained locking.
4449 // Ideally we want to put the data into the UTCP connection's send buffer.
4450 // Then, preferably only if there is room in the receiver window,
4451 // kick the meshlink thread to go send packets.
4455 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4459 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4460 if(channel->aio_send) {
4463 retval = utcp_send(channel->c, data, len);
4466 pthread_mutex_unlock(&mesh->mutex);
4469 meshlink_errno = MESHLINK_ENETWORK;
4475 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) {
4476 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
4478 if(!mesh || !channel) {
4479 meshlink_errno = MESHLINK_EINVAL;
4484 meshlink_errno = MESHLINK_EINVAL;
4488 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4491 aio->cb.buffer = cb;
4494 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4498 /* Append the AIO buffer descriptor to the end of the chain */
4499 meshlink_aio_buffer_t **p = &channel->aio_send;
4507 /* Ensure the poll callback is set, and call it right now to push data if possible */
4508 utcp_set_poll_cb(channel->c, channel_poll);
4509 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4512 channel_poll(channel->c, todo);
4515 pthread_mutex_unlock(&mesh->mutex);
4520 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) {
4521 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
4523 if(!mesh || !channel) {
4524 meshlink_errno = MESHLINK_EINVAL;
4528 if(!len || fd == -1) {
4529 meshlink_errno = MESHLINK_EINVAL;
4533 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4539 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4543 /* Append the AIO buffer descriptor to the end of the chain */
4544 meshlink_aio_buffer_t **p = &channel->aio_send;
4552 /* Ensure the poll callback is set, and call it right now to push data if possible */
4553 utcp_set_poll_cb(channel->c, channel_poll);
4554 size_t left = utcp_get_rcvbuf_free(channel->c);
4557 channel_poll(channel->c, left);
4560 pthread_mutex_unlock(&mesh->mutex);
4565 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) {
4566 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
4568 if(!mesh || !channel) {
4569 meshlink_errno = MESHLINK_EINVAL;
4574 meshlink_errno = MESHLINK_EINVAL;
4578 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4581 aio->cb.buffer = cb;
4584 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4588 /* Append the AIO buffer descriptor to the end of the chain */
4589 meshlink_aio_buffer_t **p = &channel->aio_receive;
4597 pthread_mutex_unlock(&mesh->mutex);
4602 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) {
4603 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
4605 if(!mesh || !channel) {
4606 meshlink_errno = MESHLINK_EINVAL;
4610 if(!len || fd == -1) {
4611 meshlink_errno = MESHLINK_EINVAL;
4615 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4621 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4625 /* Append the AIO buffer descriptor to the end of the chain */
4626 meshlink_aio_buffer_t **p = &channel->aio_receive;
4634 pthread_mutex_unlock(&mesh->mutex);
4639 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4640 if(!mesh || !channel) {
4641 meshlink_errno = MESHLINK_EINVAL;
4645 return channel->c->flags;
4648 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4649 if(!mesh || !channel) {
4650 meshlink_errno = MESHLINK_EINVAL;
4654 return utcp_get_sendq(channel->c);
4657 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4658 if(!mesh || !channel) {
4659 meshlink_errno = MESHLINK_EINVAL;
4663 return utcp_get_recvq(channel->c);
4666 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4667 if(!mesh || !channel) {
4668 meshlink_errno = MESHLINK_EINVAL;
4672 return utcp_get_mss(channel->node->utcp);
4675 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4676 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout);
4678 if(!mesh || !node) {
4679 meshlink_errno = MESHLINK_EINVAL;
4683 node_t *n = (node_t *)node;
4685 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4690 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4691 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4692 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4695 utcp_set_user_timeout(n->utcp, timeout);
4697 pthread_mutex_unlock(&mesh->mutex);
4700 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4701 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4702 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4703 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4704 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4707 if(mesh->node_status_cb) {
4708 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4711 if(mesh->node_pmtu_cb) {
4712 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4716 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4717 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4719 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4720 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4724 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4725 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4729 n->status.duplicate = true;
4730 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4733 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4734 logger(mesh, MESHLINK_DEBUG, "meshlink_enable_discovery(%d)", enable);
4737 meshlink_errno = MESHLINK_EINVAL;
4741 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4745 if(mesh->discovery.enabled == enable) {
4749 if(mesh->threadstarted) {
4751 discovery_start(mesh);
4753 discovery_stop(mesh);
4757 mesh->discovery.enabled = enable;
4760 pthread_mutex_unlock(&mesh->mutex);
4763 void meshlink_hint_network_change(struct meshlink_handle *mesh) {
4764 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()");
4767 meshlink_errno = MESHLINK_EINVAL;
4771 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4775 if(mesh->discovery.enabled) {
4779 if(mesh->loop.now.tv_sec > mesh->discovery.last_update + 5) {
4780 mesh->discovery.last_update = mesh->loop.now.tv_sec;
4781 handle_network_change(mesh, 1);
4784 pthread_mutex_unlock(&mesh->mutex);
4787 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4788 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout);
4790 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4791 meshlink_errno = EINVAL;
4795 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4796 meshlink_errno = EINVAL;
4800 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4804 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4805 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4806 pthread_mutex_unlock(&mesh->mutex);
4809 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4810 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period);
4812 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4813 meshlink_errno = EINVAL;
4817 if(fast_retry_period < 0) {
4818 meshlink_errno = EINVAL;
4822 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4826 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4827 pthread_mutex_unlock(&mesh->mutex);
4830 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4831 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout);
4833 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4834 meshlink_errno = EINVAL;
4838 if(maxtimeout < 0) {
4839 meshlink_errno = EINVAL;
4843 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4847 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4848 pthread_mutex_unlock(&mesh->mutex);
4851 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4852 logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()");
4858 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4862 handle_network_change(mesh, true);
4864 if(mesh->discovery.enabled) {
4865 discovery_refresh(mesh);
4868 pthread_mutex_unlock(&mesh->mutex);
4871 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4872 logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first);
4875 meshlink_errno = EINVAL;
4879 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4883 mesh->inviter_commits_first = inviter_commits_first;
4884 pthread_mutex_unlock(&mesh->mutex);
4887 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4888 logger(mesh, MESHLINK_DEBUG, "meshlink_set_external_address_discovery_url(%s)", url ? url : "(null)");
4891 meshlink_errno = EINVAL;
4895 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4896 meshlink_errno = EINVAL;
4900 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4904 free(mesh->external_address_url);
4905 mesh->external_address_url = url ? xstrdup(url) : NULL;
4906 pthread_mutex_unlock(&mesh->mutex);
4909 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4910 logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity);
4912 if(!mesh || granularity < 0) {
4913 meshlink_errno = EINVAL;
4917 utcp_set_clock_granularity(granularity);
4920 void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) {
4921 logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy);
4924 meshlink_errno = EINVAL;
4928 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4932 mesh->storage_policy = policy;
4933 pthread_mutex_unlock(&mesh->mutex);
4936 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4939 if(!mesh->connections || !mesh->loop.running) {
4944 signal_trigger(&mesh->loop, &mesh->datafromapp);
4947 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4948 // We should only call the callback function if we are in the background thread.
4949 if(!mesh->error_cb) {
4953 if(!mesh->threadstarted) {
4957 if(mesh->thread == pthread_self()) {
4958 mesh->error_cb(mesh, cb_errno);
4962 static void __attribute__((constructor)) meshlink_init(void) {
4964 utcp_set_clock_granularity(10000);
4967 static void __attribute__((destructor)) meshlink_exit(void) {