2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.h"
43 #define MSG_NOSIGNAL 0
45 __thread meshlink_errno_t meshlink_errno;
46 meshlink_log_cb_t global_log_cb;
47 meshlink_log_level_t global_log_level;
49 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
51 static int rstrip(char *value) {
52 int len = strlen(value);
54 while(len && strchr("\t\r\n ", value[len - 1])) {
61 static void get_canonical_address(node_t *n, char **hostname, char **port) {
62 if(!n->canonical_address) {
66 *hostname = xstrdup(n->canonical_address);
67 char *space = strchr(*hostname, ' ');
71 *port = xstrdup(space);
75 static bool is_valid_hostname(const char *hostname) {
80 for(const char *p = hostname; *p; p++) {
81 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
89 static bool is_valid_port(const char *port) {
96 unsigned long int result = strtoul(port, &end, 10);
97 return result && result < 65536 && !*end;
100 for(const char *p = port; *p; p++) {
101 if(!(isalnum(*p) || *p == '-')) {
109 static void set_timeout(int sock, int timeout) {
114 tv.tv_sec = timeout / 1000;
115 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
117 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
118 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
121 struct socket_in_netns_params {
130 static void *socket_in_netns_thread(void *arg) {
131 struct socket_in_netns_params *params = arg;
133 if(setns(params->netns, CLONE_NEWNET) == -1) {
134 meshlink_errno = MESHLINK_EINVAL;
138 params->fd = socket(params->domain, params->type, params->protocol);
144 static int socket_in_netns(int domain, int type, int protocol, int netns) {
146 return socket(domain, type, protocol);
150 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
154 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
155 pthread_join(thr, NULL);
165 // Find out what local address a socket would use if we connect to the given address.
166 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
167 // of both endpoints, but this will actually not send any UDP packet.
168 static bool getlocaladdr(char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
169 struct addrinfo *rai = NULL;
170 const struct addrinfo hint = {
171 .ai_family = AF_UNSPEC,
172 .ai_socktype = SOCK_DGRAM,
173 .ai_protocol = IPPROTO_UDP,
176 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
180 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
187 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
195 if(getsockname(sock, &sa->sa, salen)) {
204 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
206 socklen_t salen = sizeof(sa);
208 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
212 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
219 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
220 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
223 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
224 char *hostname = NULL;
226 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
227 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
228 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
231 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
232 if(family != AF_UNSPEC && aip->ai_family != family) {
236 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
239 set_timeout(s, 5000);
241 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
248 send(s, request, sizeof(request) - 1, 0);
249 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
254 if(line[len - 1] == '\n') {
258 char *p = strrchr(line, '\n');
261 hostname = xstrdup(p + 1);
277 // Check that the hostname is reasonable
278 if(hostname && !is_valid_hostname(hostname)) {
284 meshlink_errno = MESHLINK_ERESOLV;
290 static bool is_localaddr(sockaddr_t *sa) {
291 switch(sa->sa.sa_family) {
293 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
296 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
297 return first == 0 || (first & 0xffc0) == 0xfe80;
305 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
308 // Determine address of the local interface used for outgoing connections.
309 char localaddr[NI_MAXHOST];
310 bool success = false;
312 if(family == AF_INET) {
313 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
314 } else if(family == AF_INET6) {
315 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
318 #ifdef HAVE_GETIFADDRS
321 struct ifaddrs *ifa = NULL;
324 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
325 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
327 if(sa->sa.sa_family != family) {
331 if(is_localaddr(sa)) {
335 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
347 meshlink_errno = MESHLINK_ENETWORK;
351 return xstrdup(localaddr);
354 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
355 for(int i = 0; i < n; i++) {
360 // Ignore duplicate hostnames
363 for(int j = 0; j < i; j++) {
368 if(strcmp(host[i], host[j])) {
372 if(strcmp(port[i], port[j])) {
380 if(found || !is_valid_hostname(host[i])) {
390 // This gets the hostname part for use in invitation URLs
391 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
392 char *hostname[4] = {NULL};
393 char *port[4] = {NULL};
394 char *hostport = NULL;
396 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
397 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
400 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
401 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
404 // Add local addresses if requested
405 if(flags & MESHLINK_INVITE_LOCAL) {
406 if(flags & MESHLINK_INVITE_IPV4) {
407 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
410 if(flags & MESHLINK_INVITE_IPV6) {
411 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
415 // Add public/canonical addresses if requested
416 if(flags & MESHLINK_INVITE_PUBLIC) {
417 // Try the CanonicalAddress first
418 get_canonical_address(mesh->self, &hostname[2], &port[2]);
421 if(flags & MESHLINK_INVITE_IPV4) {
422 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
425 if(flags & MESHLINK_INVITE_IPV6) {
426 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
431 for(int i = 0; i < 4; i++) {
432 // Ensure we always have a port number
433 if(hostname[i] && !port[i]) {
434 port[i] = xstrdup(mesh->myport);
438 remove_duplicate_hostnames(hostname, port, 4);
440 // Resolve the hostnames
441 for(int i = 0; i < 4; i++) {
446 // Convert what we have to a sockaddr
447 struct addrinfo *ai_in, *ai_out;
448 struct addrinfo hint = {
449 .ai_family = AF_UNSPEC,
450 .ai_flags = AI_NUMERICSERV,
451 .ai_socktype = SOCK_STREAM,
453 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
459 // Remember the address
460 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)ai_in->ai_addr);
462 if(flags & MESHLINK_INVITE_NUMERIC) {
463 // We don't need to do any further conversion
468 // Convert it to a hostname
469 char resolved_host[NI_MAXHOST];
470 char resolved_port[NI_MAXSERV];
471 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
473 if(err || !is_valid_hostname(resolved_host)) {
478 // Convert the hostname back to a sockaddr
479 hint.ai_family = ai_in->ai_family;
480 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
487 // Check if it's still the same sockaddr
488 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
490 freeaddrinfo(ai_out);
494 // Yes: replace the hostname with the resolved one
496 hostname[i] = xstrdup(resolved_host);
499 freeaddrinfo(ai_out);
502 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
503 remove_duplicate_hostnames(hostname, port, 4);
505 // Concatenate all unique address to the hostport string
506 for(int i = 0; i < 4; i++) {
511 // Append the address to the hostport string
513 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
515 hostport = newhostport;
524 static bool try_bind(int port) {
525 struct addrinfo *ai = NULL;
526 struct addrinfo hint = {
527 .ai_flags = AI_PASSIVE,
528 .ai_family = AF_UNSPEC,
529 .ai_socktype = SOCK_STREAM,
530 .ai_protocol = IPPROTO_TCP,
534 snprintf(portstr, sizeof(portstr), "%d", port);
536 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
540 bool success = false;
542 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
543 int tcp_fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
549 int result = bind(tcp_fd, aip->ai_addr, aip->ai_addrlen);
556 int udp_fd = socket(aip->ai_family, SOCK_DGRAM, IPPROTO_UDP);
562 result = bind(udp_fd, aip->ai_addr, aip->ai_addrlen);
577 static int check_port(meshlink_handle_t *mesh) {
578 for(int i = 0; i < 1000; i++) {
579 int port = 0x1000 + prng(mesh, 0x8000);
583 xasprintf(&mesh->myport, "%d", port);
588 meshlink_errno = MESHLINK_ENETWORK;
589 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
593 static bool write_main_config_files(meshlink_handle_t *mesh) {
594 if(!mesh->confbase) {
600 /* Write the main config file */
601 packmsg_output_t out = {buf, sizeof buf};
603 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
604 packmsg_add_str(&out, mesh->name);
605 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
606 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
607 packmsg_add_uint16(&out, atoi(mesh->myport));
609 if(!packmsg_output_ok(&out)) {
613 config_t config = {buf, packmsg_output_size(&out, buf)};
615 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
619 /* Write our own host config file */
620 if(!node_write_config(mesh, mesh->self)) {
628 meshlink_handle_t *mesh;
630 char cookie[18 + 32];
641 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
642 meshlink_handle_t *mesh = state->mesh;
643 packmsg_input_t in = {buf, len};
644 uint32_t version = packmsg_get_uint32(&in);
646 if(version != MESHLINK_INVITATION_VERSION) {
647 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
651 char *name = packmsg_get_str_dup(&in);
652 packmsg_skip_element(&in); /* submesh */
653 dev_class_t devclass = packmsg_get_int32(&in);
654 uint32_t count = packmsg_get_array(&in);
657 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
661 if(!check_id(name)) {
662 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
668 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
674 free(mesh->self->name);
676 mesh->self->name = xstrdup(name);
677 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
679 // Initialize configuration directory
680 if(!config_init(mesh, "current")) {
684 if(!write_main_config_files(mesh)) {
688 // Write host config files
689 for(uint32_t i = 0; i < count; i++) {
691 uint32_t len = packmsg_get_bin_raw(&in, &data);
694 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
698 packmsg_input_t in2 = {data, len};
699 uint32_t version = packmsg_get_uint32(&in2);
700 char *name = packmsg_get_str_dup(&in2);
702 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
704 packmsg_input_invalidate(&in);
708 if(!check_id(name)) {
713 if(!strcmp(name, mesh->name)) {
714 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
716 meshlink_errno = MESHLINK_EPEER;
720 node_t *n = new_node();
723 config_t config = {data, len};
725 if(!node_read_from_config(mesh, n, &config)) {
727 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
728 meshlink_errno = MESHLINK_EPEER;
733 /* The first host config file is of the inviter itself;
734 * remember the address we are currently using for the invitation connection.
737 socklen_t salen = sizeof(sa);
739 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
740 node_add_recent_address(mesh, n, &sa);
744 /* Clear the reachability times, since we ourself have never seen these nodes yet */
745 n->last_reachable = 0;
746 n->last_unreachable = 0;
748 if(!node_write_config(mesh, n)) {
756 /* Ensure the configuration directory metadata is on disk */
757 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
761 if(!mesh->inviter_commits_first) {
762 devtool_set_inviter_commits_first(false);
765 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
767 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
772 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
774 join_state_t *state = handle;
775 const char *ptr = data;
778 int result = send(state->sock, ptr, len, 0);
780 if(result == -1 && errno == EINTR) {
782 } else if(result <= 0) {
793 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
794 join_state_t *state = handle;
795 meshlink_handle_t *mesh = state->mesh;
797 if(mesh->inviter_commits_first) {
799 case SPTPS_HANDSHAKE:
800 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
806 if(!finalize_join(state, msg, len)) {
810 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
811 shutdown(state->sock, SHUT_RDWR);
812 state->success = true;
820 case SPTPS_HANDSHAKE:
821 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
824 return finalize_join(state, msg, len);
827 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
828 shutdown(state->sock, SHUT_RDWR);
829 state->success = true;
840 static bool recvline(join_state_t *state) {
841 char *newline = NULL;
843 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
844 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
846 if(result == -1 && errno == EINTR) {
848 } else if(result <= 0) {
852 state->blen += result;
855 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
859 size_t len = newline - state->buffer;
861 memcpy(state->line, state->buffer, len);
862 state->line[len] = 0;
863 memmove(state->buffer, newline + 1, state->blen - len - 1);
864 state->blen -= len + 1;
869 static bool sendline(int fd, char *format, ...) {
875 va_start(ap, format);
876 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
879 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
887 int result = send(fd, p, blen, MSG_NOSIGNAL);
889 if(result == -1 && errno == EINTR) {
891 } else if(result <= 0) {
902 static const char *errstr[] = {
903 [MESHLINK_OK] = "No error",
904 [MESHLINK_EINVAL] = "Invalid argument",
905 [MESHLINK_ENOMEM] = "Out of memory",
906 [MESHLINK_ENOENT] = "No such node",
907 [MESHLINK_EEXIST] = "Node already exists",
908 [MESHLINK_EINTERNAL] = "Internal error",
909 [MESHLINK_ERESOLV] = "Could not resolve hostname",
910 [MESHLINK_ESTORAGE] = "Storage error",
911 [MESHLINK_ENETWORK] = "Network error",
912 [MESHLINK_EPEER] = "Error communicating with peer",
913 [MESHLINK_ENOTSUP] = "Operation not supported",
914 [MESHLINK_EBUSY] = "MeshLink instance already in use",
915 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
918 const char *meshlink_strerror(meshlink_errno_t err) {
919 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
920 return "Invalid error code";
926 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
927 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
929 mesh->private_key = ecdsa_generate();
930 mesh->invitation_key = ecdsa_generate();
932 if(!mesh->private_key || !mesh->invitation_key) {
933 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
934 meshlink_errno = MESHLINK_EINTERNAL;
938 logger(mesh, MESHLINK_DEBUG, "Done.\n");
943 static struct timeval idle(event_loop_t *loop, void *data) {
945 meshlink_handle_t *mesh = data;
946 struct timeval t, tmin = {3600, 0};
948 for splay_each(node_t, n, mesh->nodes) {
953 t = utcp_timeout(n->utcp);
955 if(timercmp(&t, &tmin, <)) {
963 // Get our local address(es) by simulating connecting to an Internet host.
964 static void add_local_addresses(meshlink_handle_t *mesh) {
966 sa.storage.ss_family = AF_UNKNOWN;
967 socklen_t salen = sizeof(sa);
971 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
972 sa.in.sin_port = ntohs(atoi(mesh->myport));
973 node_add_recent_address(mesh, mesh->self, &sa);
980 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
981 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
982 node_add_recent_address(mesh, mesh->self, &sa);
986 static bool meshlink_setup(meshlink_handle_t *mesh) {
987 if(!config_destroy(mesh->confbase, "new")) {
988 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
989 meshlink_errno = MESHLINK_ESTORAGE;
993 if(!config_destroy(mesh->confbase, "old")) {
994 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
995 meshlink_errno = MESHLINK_ESTORAGE;
999 if(!config_init(mesh, "current")) {
1000 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1001 meshlink_errno = MESHLINK_ESTORAGE;
1005 if(!ecdsa_keygen(mesh)) {
1006 meshlink_errno = MESHLINK_EINTERNAL;
1010 if(check_port(mesh) == 0) {
1011 meshlink_errno = MESHLINK_ENETWORK;
1015 /* Create a node for ourself */
1017 mesh->self = new_node();
1018 mesh->self->name = xstrdup(mesh->name);
1019 mesh->self->devclass = mesh->devclass;
1020 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1021 mesh->self->session_id = mesh->session_id;
1023 if(!write_main_config_files(mesh)) {
1024 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1025 meshlink_errno = MESHLINK_ESTORAGE;
1029 /* Ensure the configuration directory metadata is on disk */
1030 if(!config_sync(mesh, "current")) {
1037 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1040 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1041 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1045 packmsg_input_t in = {config.buf, config.len};
1046 const void *private_key;
1047 const void *invitation_key;
1049 uint32_t version = packmsg_get_uint32(&in);
1050 char *name = packmsg_get_str_dup(&in);
1051 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1052 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1053 uint16_t myport = packmsg_get_uint16(&in);
1055 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1056 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1058 config_free(&config);
1064 // TODO: check this?
1065 if(mesh->name && strcmp(mesh->name, name)) {
1066 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1067 meshlink_errno = MESHLINK_ESTORAGE;
1069 config_free(&config);
1077 xasprintf(&mesh->myport, "%u", myport);
1078 mesh->private_key = ecdsa_set_private_key(private_key);
1079 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1080 config_free(&config);
1082 /* Create a node for ourself and read our host configuration file */
1084 mesh->self = new_node();
1085 mesh->self->name = xstrdup(name);
1086 mesh->self->devclass = mesh->devclass;
1087 mesh->self->session_id = mesh->session_id;
1089 if(!node_read_public_key(mesh, mesh->self)) {
1090 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1091 meshlink_errno = MESHLINK_ESTORAGE;
1092 free_node(mesh->self);
1101 static void *setup_network_in_netns_thread(void *arg) {
1102 meshlink_handle_t *mesh = arg;
1104 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1108 bool success = setup_network(mesh);
1109 add_local_addresses(mesh);
1110 return success ? arg : NULL;
1112 #endif // HAVE_SETNS
1114 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1115 if(!confbase || !*confbase) {
1116 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1117 meshlink_errno = MESHLINK_EINVAL;
1121 if(!appname || !*appname) {
1122 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1123 meshlink_errno = MESHLINK_EINVAL;
1127 if(strchr(appname, ' ')) {
1128 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1129 meshlink_errno = MESHLINK_EINVAL;
1133 if(!name || !*name) {
1134 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1135 meshlink_errno = MESHLINK_EINVAL;
1139 if(!check_id(name)) {
1140 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1141 meshlink_errno = MESHLINK_EINVAL;
1145 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1146 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1147 meshlink_errno = MESHLINK_EINVAL;
1151 meshlink_open_params_t *params = xzalloc(sizeof * params);
1153 params->confbase = xstrdup(confbase);
1154 params->name = xstrdup(name);
1155 params->appname = xstrdup(appname);
1156 params->devclass = devclass;
1162 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1164 meshlink_errno = MESHLINK_EINVAL;
1168 params->netns = netns;
1173 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1175 meshlink_errno = MESHLINK_EINVAL;
1179 if((!key && keylen) || (key && !keylen)) {
1180 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1181 meshlink_errno = MESHLINK_EINVAL;
1186 params->keylen = keylen;
1191 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1192 if(!mesh || !new_key || !new_keylen) {
1193 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 pthread_mutex_lock(&mesh->mutex);
1200 // Create hash for the new key
1201 void *new_config_key;
1202 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1204 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1205 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1206 meshlink_errno = MESHLINK_EINTERNAL;
1207 pthread_mutex_unlock(&mesh->mutex);
1211 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1213 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1214 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1215 meshlink_errno = MESHLINK_ESTORAGE;
1216 pthread_mutex_unlock(&mesh->mutex);
1220 devtool_keyrotate_probe(1);
1222 // Rename confbase/current/ to confbase/old
1224 if(!config_rename(mesh, "current", "old")) {
1225 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1226 meshlink_errno = MESHLINK_ESTORAGE;
1227 pthread_mutex_unlock(&mesh->mutex);
1231 devtool_keyrotate_probe(2);
1233 // Rename confbase/new/ to confbase/current
1235 if(!config_rename(mesh, "new", "current")) {
1236 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1237 meshlink_errno = MESHLINK_ESTORAGE;
1238 pthread_mutex_unlock(&mesh->mutex);
1242 devtool_keyrotate_probe(3);
1244 // Cleanup the "old" confbase sub-directory
1246 if(!config_destroy(mesh->confbase, "old")) {
1247 pthread_mutex_unlock(&mesh->mutex);
1251 // Change the mesh handle key with new key
1253 free(mesh->config_key);
1254 mesh->config_key = new_config_key;
1256 pthread_mutex_unlock(&mesh->mutex);
1261 void meshlink_open_params_free(meshlink_open_params_t *params) {
1263 meshlink_errno = MESHLINK_EINVAL;
1267 free(params->confbase);
1269 free(params->appname);
1274 /// Device class traits
1275 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1276 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1277 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1278 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1279 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1282 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1283 if(!confbase || !*confbase) {
1284 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1285 meshlink_errno = MESHLINK_EINVAL;
1289 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1290 meshlink_open_params_t params;
1291 memset(¶ms, 0, sizeof(params));
1293 params.confbase = (char *)confbase;
1294 params.name = (char *)name;
1295 params.appname = (char *)appname;
1296 params.devclass = devclass;
1299 return meshlink_open_ex(¶ms);
1302 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) {
1303 if(!confbase || !*confbase) {
1304 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1305 meshlink_errno = MESHLINK_EINVAL;
1309 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1310 meshlink_open_params_t params;
1311 memset(¶ms, 0, sizeof(params));
1313 params.confbase = (char *)confbase;
1314 params.name = (char *)name;
1315 params.appname = (char *)appname;
1316 params.devclass = devclass;
1319 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1323 return meshlink_open_ex(¶ms);
1326 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1327 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1328 meshlink_open_params_t params;
1329 memset(¶ms, 0, sizeof(params));
1331 params.name = (char *)name;
1332 params.appname = (char *)appname;
1333 params.devclass = devclass;
1336 return meshlink_open_ex(¶ms);
1339 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1340 // Validate arguments provided by the application
1341 bool usingname = false;
1343 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1345 if(!params->appname || !*params->appname) {
1346 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1347 meshlink_errno = MESHLINK_EINVAL;
1351 if(strchr(params->appname, ' ')) {
1352 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1353 meshlink_errno = MESHLINK_EINVAL;
1357 if(!params->name || !*params->name) {
1358 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1360 } else { //check name only if there is a name != NULL
1362 if(!check_id(params->name)) {
1363 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1364 meshlink_errno = MESHLINK_EINVAL;
1371 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1372 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1373 meshlink_errno = MESHLINK_EINVAL;
1377 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1378 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1379 meshlink_errno = MESHLINK_EINVAL;
1383 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1385 if(params->confbase) {
1386 mesh->confbase = xstrdup(params->confbase);
1389 mesh->appname = xstrdup(params->appname);
1390 mesh->devclass = params->devclass;
1391 mesh->discovery = true;
1392 mesh->invitation_timeout = 604800; // 1 week
1393 mesh->netns = params->netns;
1394 mesh->submeshes = NULL;
1395 mesh->log_cb = global_log_cb;
1396 mesh->log_level = global_log_level;
1398 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1401 randomize(&mesh->session_id, sizeof(mesh->session_id));
1402 } while(mesh->session_id == 0);
1404 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1407 mesh->name = xstrdup(params->name);
1412 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1414 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1415 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1416 meshlink_close(mesh);
1417 meshlink_errno = MESHLINK_EINTERNAL;
1423 pthread_mutexattr_t attr;
1424 pthread_mutexattr_init(&attr);
1425 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1426 pthread_mutex_init(&mesh->mutex, &attr);
1428 mesh->threadstarted = false;
1429 event_loop_init(&mesh->loop);
1430 mesh->loop.data = mesh;
1432 meshlink_queue_init(&mesh->outpacketqueue);
1434 // Atomically lock the configuration directory.
1435 if(!main_config_lock(mesh)) {
1436 meshlink_close(mesh);
1440 // If no configuration exists yet, create it.
1442 if(!meshlink_confbase_exists(mesh)) {
1443 if(!meshlink_setup(mesh)) {
1444 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1445 meshlink_close(mesh);
1449 if(!meshlink_read_config(mesh)) {
1450 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1451 meshlink_close(mesh);
1457 struct WSAData wsa_state;
1458 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1461 // Setup up everything
1462 // TODO: we should not open listening sockets yet
1464 bool success = false;
1466 if(mesh->netns != -1) {
1470 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1471 void *retval = NULL;
1472 success = pthread_join(thr, &retval) == 0 && retval;
1476 meshlink_errno = MESHLINK_EINTERNAL;
1479 #endif // HAVE_SETNS
1481 success = setup_network(mesh);
1482 add_local_addresses(mesh);
1486 meshlink_close(mesh);
1487 meshlink_errno = MESHLINK_ENETWORK;
1491 add_local_addresses(mesh);
1493 if(!node_write_config(mesh, mesh->self)) {
1494 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1498 idle_set(&mesh->loop, idle, mesh);
1500 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1504 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1505 meshlink_submesh_t *s = NULL;
1508 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1509 meshlink_errno = MESHLINK_EINVAL;
1513 if(!submesh || !*submesh) {
1514 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1515 meshlink_errno = MESHLINK_EINVAL;
1520 pthread_mutex_lock(&mesh->mutex);
1522 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1524 pthread_mutex_unlock(&mesh->mutex);
1529 static void *meshlink_main_loop(void *arg) {
1530 meshlink_handle_t *mesh = arg;
1532 if(mesh->netns != -1) {
1535 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1536 pthread_cond_signal(&mesh->cond);
1541 pthread_cond_signal(&mesh->cond);
1543 #endif // HAVE_SETNS
1548 if(mesh->discovery) {
1549 discovery_start(mesh);
1554 pthread_mutex_lock(&mesh->mutex);
1556 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1557 pthread_cond_broadcast(&mesh->cond);
1559 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1561 pthread_mutex_unlock(&mesh->mutex);
1566 if(mesh->discovery) {
1567 discovery_stop(mesh);
1575 bool meshlink_start(meshlink_handle_t *mesh) {
1577 meshlink_errno = MESHLINK_EINVAL;
1581 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1583 pthread_mutex_lock(&mesh->mutex);
1586 assert(mesh->private_key);
1587 assert(mesh->self->ecdsa);
1588 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1590 if(mesh->threadstarted) {
1591 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1592 pthread_mutex_unlock(&mesh->mutex);
1596 if(mesh->listen_socket[0].tcp.fd < 0) {
1597 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1598 meshlink_errno = MESHLINK_ENETWORK;
1602 // TODO: open listening sockets first
1604 //Check that a valid name is set
1606 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1607 meshlink_errno = MESHLINK_EINVAL;
1608 pthread_mutex_unlock(&mesh->mutex);
1612 init_outgoings(mesh);
1614 // Start the main thread
1616 event_loop_start(&mesh->loop);
1618 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1619 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1620 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1621 meshlink_errno = MESHLINK_EINTERNAL;
1622 event_loop_stop(&mesh->loop);
1623 pthread_mutex_unlock(&mesh->mutex);
1627 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1628 mesh->threadstarted = true;
1630 // Ensure we are considered reachable
1633 pthread_mutex_unlock(&mesh->mutex);
1637 void meshlink_stop(meshlink_handle_t *mesh) {
1639 meshlink_errno = MESHLINK_EINVAL;
1643 pthread_mutex_lock(&mesh->mutex);
1644 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1646 // Shut down the main thread
1647 event_loop_stop(&mesh->loop);
1649 // Send ourselves a UDP packet to kick the event loop
1650 for(int i = 0; i < mesh->listen_sockets; i++) {
1652 socklen_t salen = sizeof(sa);
1654 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1655 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1659 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1660 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1664 if(mesh->threadstarted) {
1665 // Wait for the main thread to finish
1666 pthread_mutex_unlock(&mesh->mutex);
1667 pthread_join(mesh->thread, NULL);
1668 pthread_mutex_lock(&mesh->mutex);
1670 mesh->threadstarted = false;
1673 // Close all metaconnections
1674 if(mesh->connections) {
1675 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1677 connection_t *c = node->data;
1679 terminate_connection(mesh, c, false);
1683 exit_outgoings(mesh);
1685 // Ensure we are considered unreachable
1690 // Try to write out any changed node config files, ignore errors at this point.
1692 for splay_each(node_t, n, mesh->nodes) {
1693 if(n->status.dirty) {
1694 n->status.dirty = !node_write_config(mesh, n);
1699 pthread_mutex_unlock(&mesh->mutex);
1702 void meshlink_close(meshlink_handle_t *mesh) {
1704 meshlink_errno = MESHLINK_EINVAL;
1708 // stop can be called even if mesh has not been started
1709 meshlink_stop(mesh);
1711 // lock is not released after this
1712 pthread_mutex_lock(&mesh->mutex);
1714 // Close and free all resources used.
1716 close_network_connections(mesh);
1718 logger(mesh, MESHLINK_INFO, "Terminating");
1720 event_loop_exit(&mesh->loop);
1724 if(mesh->confbase) {
1730 ecdsa_free(mesh->invitation_key);
1732 if(mesh->netns != -1) {
1736 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1740 meshlink_queue_exit(&mesh->outpacketqueue);
1743 free(mesh->appname);
1744 free(mesh->confbase);
1745 free(mesh->config_key);
1746 ecdsa_free(mesh->private_key);
1748 main_config_unlock(mesh);
1750 pthread_mutex_unlock(&mesh->mutex);
1751 pthread_mutex_destroy(&mesh->mutex);
1753 memset(mesh, 0, sizeof(*mesh));
1758 bool meshlink_destroy(const char *confbase) {
1760 meshlink_errno = MESHLINK_EINVAL;
1764 /* Exit early if the confbase directory itself doesn't exist */
1765 if(access(confbase, F_OK) && errno == ENOENT) {
1769 /* Take the lock the same way meshlink_open() would. */
1770 char lockfilename[PATH_MAX];
1771 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1773 FILE *lockfile = fopen(lockfilename, "w+");
1776 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1777 meshlink_errno = MESHLINK_ESTORAGE;
1782 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1786 // TODO: use _locking()?
1789 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1790 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1792 meshlink_errno = MESHLINK_EBUSY;
1798 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1799 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1803 if(unlink(lockfilename)) {
1804 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1806 meshlink_errno = MESHLINK_ESTORAGE;
1812 if(!sync_path(confbase)) {
1813 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1814 meshlink_errno = MESHLINK_ESTORAGE;
1821 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1823 meshlink_errno = MESHLINK_EINVAL;
1827 pthread_mutex_lock(&mesh->mutex);
1828 mesh->receive_cb = cb;
1829 pthread_mutex_unlock(&mesh->mutex);
1832 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1834 meshlink_errno = MESHLINK_EINVAL;
1838 pthread_mutex_lock(&mesh->mutex);
1839 mesh->connection_try_cb = cb;
1840 pthread_mutex_unlock(&mesh->mutex);
1843 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1845 meshlink_errno = MESHLINK_EINVAL;
1849 pthread_mutex_lock(&mesh->mutex);
1850 mesh->node_status_cb = cb;
1851 pthread_mutex_unlock(&mesh->mutex);
1854 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1856 meshlink_errno = MESHLINK_EINVAL;
1860 pthread_mutex_lock(&mesh->mutex);
1861 mesh->node_pmtu_cb = cb;
1862 pthread_mutex_unlock(&mesh->mutex);
1865 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1867 meshlink_errno = MESHLINK_EINVAL;
1871 pthread_mutex_lock(&mesh->mutex);
1872 mesh->node_duplicate_cb = cb;
1873 pthread_mutex_unlock(&mesh->mutex);
1876 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1878 pthread_mutex_lock(&mesh->mutex);
1880 mesh->log_level = cb ? level : 0;
1881 pthread_mutex_unlock(&mesh->mutex);
1884 global_log_level = cb ? level : 0;
1888 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1890 meshlink_errno = MESHLINK_EINVAL;
1894 pthread_mutex_lock(&mesh->mutex);
1895 mesh->error_cb = cb;
1896 pthread_mutex_unlock(&mesh->mutex);
1899 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1900 meshlink_packethdr_t *hdr;
1902 // Validate arguments
1903 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1904 meshlink_errno = MESHLINK_EINVAL;
1913 meshlink_errno = MESHLINK_EINVAL;
1917 node_t *n = (node_t *)destination;
1919 if(n->status.blacklisted) {
1920 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1921 meshlink_errno = MESHLINK_EBLACKLISTED;
1925 // Prepare the packet
1926 vpn_packet_t *packet = malloc(sizeof(*packet));
1929 meshlink_errno = MESHLINK_ENOMEM;
1933 packet->probe = false;
1934 packet->tcp = false;
1935 packet->len = len + sizeof(*hdr);
1937 hdr = (meshlink_packethdr_t *)packet->data;
1938 memset(hdr, 0, sizeof(*hdr));
1939 // leave the last byte as 0 to make sure strings are always
1940 // null-terminated if they are longer than the buffer
1941 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1942 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1944 memcpy(packet->data + sizeof(*hdr), data, len);
1947 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1949 meshlink_errno = MESHLINK_ENOMEM;
1953 // Notify event loop
1954 signal_trigger(&mesh->loop, &mesh->datafromapp);
1959 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1961 meshlink_handle_t *mesh = data;
1962 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1968 mesh->self->in_packets++;
1969 mesh->self->in_bytes += packet->len;
1970 route(mesh, mesh->self, packet);
1975 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1976 if(!mesh || !destination) {
1977 meshlink_errno = MESHLINK_EINVAL;
1981 pthread_mutex_lock(&mesh->mutex);
1983 node_t *n = (node_t *)destination;
1985 if(!n->status.reachable) {
1986 pthread_mutex_unlock(&mesh->mutex);
1989 } else if(n->mtuprobes > 30 && n->minmtu) {
1990 pthread_mutex_unlock(&mesh->mutex);
1993 pthread_mutex_unlock(&mesh->mutex);
1998 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1999 if(!mesh || !node) {
2000 meshlink_errno = MESHLINK_EINVAL;
2004 pthread_mutex_lock(&mesh->mutex);
2006 node_t *n = (node_t *)node;
2008 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2009 meshlink_errno = MESHLINK_EINTERNAL;
2010 pthread_mutex_unlock(&mesh->mutex);
2014 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2017 meshlink_errno = MESHLINK_EINTERNAL;
2020 pthread_mutex_unlock(&mesh->mutex);
2024 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2026 meshlink_errno = MESHLINK_EINVAL;
2030 return (meshlink_node_t *)mesh->self;
2033 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2034 if(!mesh || !name) {
2035 meshlink_errno = MESHLINK_EINVAL;
2041 pthread_mutex_lock(&mesh->mutex);
2042 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2043 pthread_mutex_unlock(&mesh->mutex);
2046 meshlink_errno = MESHLINK_ENOENT;
2049 return (meshlink_node_t *)n;
2052 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2053 if(!mesh || !name) {
2054 meshlink_errno = MESHLINK_EINVAL;
2058 meshlink_submesh_t *submesh = NULL;
2060 pthread_mutex_lock(&mesh->mutex);
2061 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2062 pthread_mutex_unlock(&mesh->mutex);
2065 meshlink_errno = MESHLINK_ENOENT;
2071 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2072 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2073 meshlink_errno = MESHLINK_EINVAL;
2077 meshlink_node_t **result;
2080 pthread_mutex_lock(&mesh->mutex);
2082 *nmemb = mesh->nodes->count;
2083 result = realloc(nodes, *nmemb * sizeof(*nodes));
2086 meshlink_node_t **p = result;
2088 for splay_each(node_t, n, mesh->nodes) {
2089 *p++ = (meshlink_node_t *)n;
2094 meshlink_errno = MESHLINK_ENOMEM;
2097 pthread_mutex_unlock(&mesh->mutex);
2102 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) {
2103 meshlink_node_t **result;
2105 pthread_mutex_lock(&mesh->mutex);
2109 for splay_each(node_t, n, mesh->nodes) {
2110 if(search_node(n, condition)) {
2117 pthread_mutex_unlock(&mesh->mutex);
2121 result = realloc(nodes, *nmemb * sizeof(*nodes));
2124 meshlink_node_t **p = result;
2126 for splay_each(node_t, n, mesh->nodes) {
2127 if(search_node(n, condition)) {
2128 *p++ = (meshlink_node_t *)n;
2134 meshlink_errno = MESHLINK_ENOMEM;
2137 pthread_mutex_unlock(&mesh->mutex);
2142 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2143 dev_class_t *devclass = (dev_class_t *)condition;
2145 if(*devclass == (dev_class_t)node->devclass) {
2152 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2153 if(condition == node->submesh) {
2165 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2166 const struct time_range *range = condition;
2167 time_t start = node->last_reachable;
2168 time_t end = node->last_unreachable;
2178 if(range->end >= range->start) {
2179 return start <= range->end && end >= range->start;
2181 return start > range->start || end < range->end;
2185 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) {
2186 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2187 meshlink_errno = MESHLINK_EINVAL;
2191 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2194 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2195 if(!mesh || !submesh || !nmemb) {
2196 meshlink_errno = MESHLINK_EINVAL;
2200 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2203 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) {
2204 if(!mesh || !nmemb) {
2205 meshlink_errno = MESHLINK_EINVAL;
2209 struct time_range range = {start, end};
2211 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2214 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2215 if(!mesh || !node) {
2216 meshlink_errno = MESHLINK_EINVAL;
2220 dev_class_t devclass;
2222 pthread_mutex_lock(&mesh->mutex);
2224 devclass = ((node_t *)node)->devclass;
2226 pthread_mutex_unlock(&mesh->mutex);
2231 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2232 if(!mesh || !node) {
2233 meshlink_errno = MESHLINK_EINVAL;
2237 node_t *n = (node_t *)node;
2239 meshlink_submesh_t *s;
2241 s = (meshlink_submesh_t *)n->submesh;
2246 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2247 if(!mesh || !node) {
2248 meshlink_errno = MESHLINK_EINVAL;
2252 node_t *n = (node_t *)node;
2255 pthread_mutex_lock(&mesh->mutex);
2256 reachable = n->status.reachable && !n->status.blacklisted;
2258 if(last_reachable) {
2259 *last_reachable = n->last_reachable;
2262 if(last_unreachable) {
2263 *last_unreachable = n->last_unreachable;
2266 pthread_mutex_unlock(&mesh->mutex);
2271 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2272 if(!mesh || !data || !len || !signature || !siglen) {
2273 meshlink_errno = MESHLINK_EINVAL;
2277 if(*siglen < MESHLINK_SIGLEN) {
2278 meshlink_errno = MESHLINK_EINVAL;
2282 pthread_mutex_lock(&mesh->mutex);
2284 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2285 meshlink_errno = MESHLINK_EINTERNAL;
2286 pthread_mutex_unlock(&mesh->mutex);
2290 *siglen = MESHLINK_SIGLEN;
2291 pthread_mutex_unlock(&mesh->mutex);
2295 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2296 if(!mesh || !source || !data || !len || !signature) {
2297 meshlink_errno = MESHLINK_EINVAL;
2301 if(siglen != MESHLINK_SIGLEN) {
2302 meshlink_errno = MESHLINK_EINVAL;
2306 pthread_mutex_lock(&mesh->mutex);
2310 struct node_t *n = (struct node_t *)source;
2312 if(!node_read_public_key(mesh, n)) {
2313 meshlink_errno = MESHLINK_EINTERNAL;
2316 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2319 pthread_mutex_unlock(&mesh->mutex);
2323 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2324 pthread_mutex_lock(&mesh->mutex);
2326 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2329 // TODO: Update invitation key if necessary?
2332 pthread_mutex_unlock(&mesh->mutex);
2334 return mesh->invitation_key;
2337 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2338 if(!mesh || !node || !address) {
2339 meshlink_errno = MESHLINK_EINVAL;
2343 if(!is_valid_hostname(address)) {
2344 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2345 meshlink_errno = MESHLINK_EINVAL;
2349 if(port && !is_valid_port(port)) {
2350 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2351 meshlink_errno = MESHLINK_EINVAL;
2355 char *canonical_address;
2358 xasprintf(&canonical_address, "%s %s", address, port);
2360 canonical_address = xstrdup(address);
2363 pthread_mutex_lock(&mesh->mutex);
2365 node_t *n = (node_t *)node;
2366 free(n->canonical_address);
2367 n->canonical_address = canonical_address;
2369 if(!node_write_config(mesh, n)) {
2370 pthread_mutex_unlock(&mesh->mutex);
2374 pthread_mutex_unlock(&mesh->mutex);
2376 return config_sync(mesh, "current");
2379 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2380 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2383 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2385 meshlink_errno = MESHLINK_EINVAL;
2389 char *address = meshlink_get_external_address(mesh);
2395 bool rval = meshlink_add_address(mesh, address);
2401 int meshlink_get_port(meshlink_handle_t *mesh) {
2403 meshlink_errno = MESHLINK_EINVAL;
2408 meshlink_errno = MESHLINK_EINTERNAL;
2414 pthread_mutex_lock(&mesh->mutex);
2415 port = atoi(mesh->myport);
2416 pthread_mutex_unlock(&mesh->mutex);
2421 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2422 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2423 meshlink_errno = MESHLINK_EINVAL;
2427 if(mesh->myport && port == atoi(mesh->myport)) {
2431 if(!try_bind(port)) {
2432 meshlink_errno = MESHLINK_ENETWORK;
2436 devtool_trybind_probe();
2440 pthread_mutex_lock(&mesh->mutex);
2442 if(mesh->threadstarted) {
2443 meshlink_errno = MESHLINK_EINVAL;
2448 xasprintf(&mesh->myport, "%d", port);
2450 /* Close down the network. This also deletes mesh->self. */
2451 close_network_connections(mesh);
2453 /* Recreate mesh->self. */
2454 mesh->self = new_node();
2455 mesh->self->name = xstrdup(mesh->name);
2456 mesh->self->devclass = mesh->devclass;
2457 mesh->self->session_id = mesh->session_id;
2458 xasprintf(&mesh->myport, "%d", port);
2460 if(!node_read_public_key(mesh, mesh->self)) {
2461 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2462 meshlink_errno = MESHLINK_ESTORAGE;
2463 free_node(mesh->self);
2466 } else if(!setup_network(mesh)) {
2467 meshlink_errno = MESHLINK_ENETWORK;
2471 /* Rebuild our own list of recent addresses */
2472 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2473 add_local_addresses(mesh);
2475 /* Write meshlink.conf with the updated port number */
2476 write_main_config_files(mesh);
2478 rval = config_sync(mesh, "current");
2481 pthread_mutex_unlock(&mesh->mutex);
2483 return rval && meshlink_get_port(mesh) == port;
2486 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2487 mesh->invitation_timeout = timeout;
2490 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2491 meshlink_submesh_t *s = NULL;
2494 meshlink_errno = MESHLINK_EINVAL;
2499 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2502 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2503 meshlink_errno = MESHLINK_EINVAL;
2507 s = (meshlink_submesh_t *)mesh->self->submesh;
2510 pthread_mutex_lock(&mesh->mutex);
2512 // Check validity of the new node's name
2513 if(!check_id(name)) {
2514 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2515 meshlink_errno = MESHLINK_EINVAL;
2516 pthread_mutex_unlock(&mesh->mutex);
2520 // Ensure no host configuration file with that name exists
2521 if(config_exists(mesh, "current", name)) {
2522 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2523 meshlink_errno = MESHLINK_EEXIST;
2524 pthread_mutex_unlock(&mesh->mutex);
2528 // Ensure no other nodes know about this name
2529 if(lookup_node(mesh, name)) {
2530 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2531 meshlink_errno = MESHLINK_EEXIST;
2532 pthread_mutex_unlock(&mesh->mutex);
2536 // Get the local address
2537 char *address = get_my_hostname(mesh, flags);
2540 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2541 meshlink_errno = MESHLINK_ERESOLV;
2542 pthread_mutex_unlock(&mesh->mutex);
2546 if(!refresh_invitation_key(mesh)) {
2547 meshlink_errno = MESHLINK_EINTERNAL;
2548 pthread_mutex_unlock(&mesh->mutex);
2552 // If we changed our own host config file, write it out now
2553 if(mesh->self->status.dirty) {
2554 if(!node_write_config(mesh, mesh->self)) {
2555 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2556 pthread_mutex_unlock(&mesh->mutex);
2563 // Create a hash of the key.
2564 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2565 sha512(fingerprint, strlen(fingerprint), hash);
2566 b64encode_urlsafe(hash, hash, 18);
2568 // Create a random cookie for this invitation.
2570 randomize(cookie, 18);
2572 // Create a filename that doesn't reveal the cookie itself
2573 char buf[18 + strlen(fingerprint)];
2574 char cookiehash[64];
2575 memcpy(buf, cookie, 18);
2576 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2577 sha512(buf, sizeof(buf), cookiehash);
2578 b64encode_urlsafe(cookiehash, cookiehash, 18);
2580 b64encode_urlsafe(cookie, cookie, 18);
2584 /* Construct the invitation file */
2585 uint8_t outbuf[4096];
2586 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2588 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2589 packmsg_add_str(&inv, name);
2590 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2591 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2593 /* TODO: Add several host config files to bootstrap connections.
2594 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2595 * and are not blacklisted.
2597 config_t configs[5];
2598 memset(configs, 0, sizeof(configs));
2601 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2605 /* Append host config files to the invitation file */
2606 packmsg_add_array(&inv, count);
2608 for(int i = 0; i < count; i++) {
2609 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2610 config_free(&configs[i]);
2613 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2615 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2616 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2617 meshlink_errno = MESHLINK_ESTORAGE;
2618 pthread_mutex_unlock(&mesh->mutex);
2622 // Create an URL from the local address, key hash and cookie
2624 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2627 pthread_mutex_unlock(&mesh->mutex);
2631 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2632 return meshlink_invite_ex(mesh, submesh, name, 0);
2635 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2636 if(!mesh || !invitation) {
2637 meshlink_errno = MESHLINK_EINVAL;
2641 join_state_t state = {
2646 ecdsa_t *key = NULL;
2647 ecdsa_t *hiskey = NULL;
2649 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2650 char copy[strlen(invitation) + 1];
2652 pthread_mutex_lock(&mesh->mutex);
2654 //Before doing meshlink_join make sure we are not connected to another mesh
2655 if(mesh->threadstarted) {
2656 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2657 meshlink_errno = MESHLINK_EINVAL;
2661 // 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.
2662 if(mesh->nodes->count > 1) {
2663 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2664 meshlink_errno = MESHLINK_EINVAL;
2668 strcpy(copy, invitation);
2670 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2672 char *slash = strchr(copy, '/');
2680 if(strlen(slash) != 48) {
2684 char *address = copy;
2687 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2691 if(mesh->inviter_commits_first) {
2692 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2695 // Generate a throw-away key for the invitation.
2696 key = ecdsa_generate();
2699 meshlink_errno = MESHLINK_EINTERNAL;
2703 char *b64key = ecdsa_get_base64_public_key(key);
2706 while(address && *address) {
2707 // We allow commas in the address part to support multiple addresses in one invitation URL.
2708 comma = strchr(address, ',');
2714 // Split of the port
2715 port = strrchr(address, ':');
2723 // IPv6 address are enclosed in brackets, per RFC 3986
2724 if(*address == '[') {
2726 char *bracket = strchr(address, ']');
2739 // Connect to the meshlink daemon mentioned in the URL.
2740 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2743 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2744 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2746 if(state.sock == -1) {
2747 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2748 meshlink_errno = MESHLINK_ENETWORK;
2752 set_timeout(state.sock, 5000);
2754 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2755 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2756 meshlink_errno = MESHLINK_ENETWORK;
2757 closesocket(state.sock);
2765 meshlink_errno = MESHLINK_ERESOLV;
2768 if(state.sock != -1 || !comma) {
2775 if(state.sock == -1) {
2779 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2781 // Tell him we have an invitation, and give him our throw-away key.
2785 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2786 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2787 meshlink_errno = MESHLINK_ENETWORK;
2793 char hisname[4096] = "";
2794 int code, hismajor, hisminor = 0;
2796 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) {
2797 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2798 meshlink_errno = MESHLINK_ENETWORK;
2802 // Check if the hash of the key he gave us matches the hash in the URL.
2803 char *fingerprint = state.line + 2;
2806 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2807 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2808 meshlink_errno = MESHLINK_EINTERNAL;
2812 if(memcmp(hishash, state.hash, 18)) {
2813 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2814 meshlink_errno = MESHLINK_EPEER;
2818 hiskey = ecdsa_set_base64_public_key(fingerprint);
2821 meshlink_errno = MESHLINK_EINTERNAL;
2825 // Start an SPTPS session
2826 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2827 meshlink_errno = MESHLINK_EINTERNAL;
2831 // Feed rest of input buffer to SPTPS
2832 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2833 meshlink_errno = MESHLINK_EPEER;
2838 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2840 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2842 if(errno == EINTR) {
2846 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2847 meshlink_errno = MESHLINK_ENETWORK;
2851 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2852 meshlink_errno = MESHLINK_EPEER;
2857 if(!state.success) {
2858 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2859 meshlink_errno = MESHLINK_EPEER;
2863 sptps_stop(&state.sptps);
2866 closesocket(state.sock);
2868 pthread_mutex_unlock(&mesh->mutex);
2872 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2873 meshlink_errno = MESHLINK_EINVAL;
2875 sptps_stop(&state.sptps);
2879 if(state.sock != -1) {
2880 closesocket(state.sock);
2883 pthread_mutex_unlock(&mesh->mutex);
2887 char *meshlink_export(meshlink_handle_t *mesh) {
2889 meshlink_errno = MESHLINK_EINVAL;
2893 // Create a config file on the fly.
2896 packmsg_output_t out = {buf, sizeof(buf)};
2897 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2898 packmsg_add_str(&out, mesh->name);
2899 packmsg_add_str(&out, CORE_MESH);
2901 pthread_mutex_lock(&mesh->mutex);
2903 packmsg_add_int32(&out, mesh->self->devclass);
2904 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2905 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2906 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2910 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2911 if(mesh->self->recent[i].sa.sa_family) {
2918 packmsg_add_array(&out, count);
2920 for(uint32_t i = 0; i < count; i++) {
2921 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2924 packmsg_add_int64(&out, 0);
2925 packmsg_add_int64(&out, 0);
2927 pthread_mutex_unlock(&mesh->mutex);
2929 if(!packmsg_output_ok(&out)) {
2930 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2931 meshlink_errno = MESHLINK_EINTERNAL;
2935 // Prepare a base64-encoded packmsg array containing our config file
2937 uint32_t len = packmsg_output_size(&out, buf);
2938 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2939 uint8_t *buf2 = xmalloc(len2);
2940 packmsg_output_t out2 = {buf2, len2};
2941 packmsg_add_array(&out2, 1);
2942 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2944 if(!packmsg_output_ok(&out2)) {
2945 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2946 meshlink_errno = MESHLINK_EINTERNAL;
2951 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2953 return (char *)buf2;
2956 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2957 if(!mesh || !data) {
2958 meshlink_errno = MESHLINK_EINVAL;
2962 size_t datalen = strlen(data);
2963 uint8_t *buf = xmalloc(datalen);
2964 int buflen = b64decode(data, buf, datalen);
2967 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2968 meshlink_errno = MESHLINK_EPEER;
2972 packmsg_input_t in = {buf, buflen};
2973 uint32_t count = packmsg_get_array(&in);
2976 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2977 meshlink_errno = MESHLINK_EPEER;
2981 pthread_mutex_lock(&mesh->mutex);
2985 uint32_t len = packmsg_get_bin_raw(&in, &data);
2991 packmsg_input_t in2 = {data, len};
2992 uint32_t version = packmsg_get_uint32(&in2);
2993 char *name = packmsg_get_str_dup(&in2);
2995 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2997 packmsg_input_invalidate(&in);
3001 if(!check_id(name)) {
3006 node_t *n = lookup_node(mesh, name);
3009 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3017 config_t config = {data, len};
3019 if(!node_read_from_config(mesh, n, &config)) {
3021 packmsg_input_invalidate(&in);
3025 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3026 n->last_reachable = 0;
3027 n->last_unreachable = 0;
3029 if(!node_write_config(mesh, n)) {
3037 pthread_mutex_unlock(&mesh->mutex);
3041 if(!packmsg_done(&in)) {
3042 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3043 meshlink_errno = MESHLINK_EPEER;
3047 if(!config_sync(mesh, "current")) {
3054 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3055 if(n == mesh->self) {
3056 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3057 meshlink_errno = MESHLINK_EINVAL;
3061 if(n->status.blacklisted) {
3062 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3066 n->status.blacklisted = true;
3068 /* Immediately shut down any connections we have with the blacklisted node.
3069 * We can't call terminate_connection(), because we might be called from a callback function.
3071 for list_each(connection_t, c, mesh->connections) {
3073 shutdown(c->socket, SHUT_RDWR);
3077 utcp_abort_all_connections(n->utcp);
3083 n->status.udp_confirmed = false;
3085 if(n->status.reachable) {
3086 n->last_unreachable = mesh->loop.now.tv_sec;
3089 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3090 * manually call the status callback if necessary.
3092 if(n->status.reachable && mesh->node_status_cb) {
3093 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3096 return node_write_config(mesh, n) && config_sync(mesh, "current");
3099 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3100 if(!mesh || !node) {
3101 meshlink_errno = MESHLINK_EINVAL;
3105 pthread_mutex_lock(&mesh->mutex);
3107 if(!blacklist(mesh, (node_t *)node)) {
3108 pthread_mutex_unlock(&mesh->mutex);
3112 pthread_mutex_unlock(&mesh->mutex);
3114 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3118 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3119 if(!mesh || !name) {
3120 meshlink_errno = MESHLINK_EINVAL;
3124 pthread_mutex_lock(&mesh->mutex);
3126 node_t *n = lookup_node(mesh, (char *)name);
3130 n->name = xstrdup(name);
3134 if(!blacklist(mesh, (node_t *)n)) {
3135 pthread_mutex_unlock(&mesh->mutex);
3139 pthread_mutex_unlock(&mesh->mutex);
3141 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3145 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3146 if(n == mesh->self) {
3147 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3148 meshlink_errno = MESHLINK_EINVAL;
3152 if(!n->status.blacklisted) {
3153 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3157 n->status.blacklisted = false;
3159 if(n->status.reachable) {
3160 n->last_reachable = mesh->loop.now.tv_sec;
3161 update_node_status(mesh, n);
3164 return node_write_config(mesh, n) && config_sync(mesh, "current");
3167 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3168 if(!mesh || !node) {
3169 meshlink_errno = MESHLINK_EINVAL;
3173 pthread_mutex_lock(&mesh->mutex);
3175 if(!whitelist(mesh, (node_t *)node)) {
3176 pthread_mutex_unlock(&mesh->mutex);
3180 pthread_mutex_unlock(&mesh->mutex);
3182 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3186 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3187 if(!mesh || !name) {
3188 meshlink_errno = MESHLINK_EINVAL;
3192 pthread_mutex_lock(&mesh->mutex);
3194 node_t *n = lookup_node(mesh, (char *)name);
3198 n->name = xstrdup(name);
3202 if(!whitelist(mesh, (node_t *)n)) {
3203 pthread_mutex_unlock(&mesh->mutex);
3207 pthread_mutex_unlock(&mesh->mutex);
3209 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3213 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3214 mesh->default_blacklist = blacklist;
3217 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3218 if(!mesh || !node) {
3219 meshlink_errno = MESHLINK_EINVAL;
3223 node_t *n = (node_t *)node;
3225 pthread_mutex_lock(&mesh->mutex);
3227 /* Check that the node is not reachable */
3228 if(n->status.reachable || n->connection) {
3229 pthread_mutex_unlock(&mesh->mutex);
3230 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3234 /* Check that we don't have any active UTCP connections */
3235 if(n->utcp && utcp_is_active(n->utcp)) {
3236 pthread_mutex_unlock(&mesh->mutex);
3237 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3241 /* Check that we have no active connections to this node */
3242 for list_each(connection_t, c, mesh->connections) {
3244 pthread_mutex_unlock(&mesh->mutex);
3245 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3250 /* Remove any pending outgoings to this node */
3251 if(mesh->outgoings) {
3252 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3253 if(outgoing->node == n) {
3254 list_delete_node(mesh->outgoings, node);
3259 /* Delete the config file for this node */
3260 if(!config_delete(mesh, "current", n->name)) {
3261 pthread_mutex_unlock(&mesh->mutex);
3265 /* Delete the node struct and any remaining edges referencing this node */
3268 pthread_mutex_unlock(&mesh->mutex);
3270 return config_sync(mesh, "current");
3273 /* Hint that a hostname may be found at an address
3274 * See header file for detailed comment.
3276 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3277 if(!mesh || !node || !addr) {
3278 meshlink_errno = EINVAL;
3282 pthread_mutex_lock(&mesh->mutex);
3284 node_t *n = (node_t *)node;
3286 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3287 if(!node_write_config(mesh, n)) {
3288 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3292 pthread_mutex_unlock(&mesh->mutex);
3293 // @TODO do we want to fire off a connection attempt right away?
3296 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3298 node_t *n = utcp->priv;
3299 meshlink_handle_t *mesh = n->mesh;
3300 return mesh->channel_accept_cb;
3303 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3305 if(aio->cb.buffer) {
3306 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3310 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3315 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3316 meshlink_channel_t *channel = connection->priv;
3322 node_t *n = channel->node;
3323 meshlink_handle_t *mesh = n->mesh;
3325 if(n->status.destroyed) {
3326 meshlink_channel_close(mesh, channel);
3330 const char *p = data;
3333 while(channel->aio_receive) {
3334 meshlink_aio_buffer_t *aio = channel->aio_receive;
3335 size_t todo = aio->len - aio->done;
3342 memcpy((char *)aio->data + aio->done, p, todo);
3344 ssize_t result = write(aio->fd, p, todo);
3353 if(aio->done == aio->len) {
3354 channel->aio_receive = aio->next;
3355 aio_signal(mesh, channel, aio);
3367 if(channel->receive_cb) {
3368 channel->receive_cb(mesh, channel, p, left);
3374 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3375 node_t *n = utcp_connection->utcp->priv;
3381 meshlink_handle_t *mesh = n->mesh;
3383 if(!mesh->channel_accept_cb) {
3387 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3389 channel->c = utcp_connection;
3391 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3392 utcp_accept(utcp_connection, channel_recv, channel);
3398 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3399 node_t *n = utcp->priv;
3401 if(n->status.destroyed) {
3405 meshlink_handle_t *mesh = n->mesh;
3406 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3409 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3410 if(!mesh || !channel) {
3411 meshlink_errno = MESHLINK_EINVAL;
3415 channel->receive_cb = cb;
3418 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3420 node_t *n = (node_t *)source;
3426 utcp_recv(n->utcp, data, len);
3429 static void channel_poll(struct utcp_connection *connection, size_t len) {
3430 meshlink_channel_t *channel = connection->priv;
3436 node_t *n = channel->node;
3437 meshlink_handle_t *mesh = n->mesh;
3438 meshlink_aio_buffer_t *aio = channel->aio_send;
3441 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3442 size_t left = aio->len - aio->done;
3450 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3453 size_t todo = utcp_get_sndbuf_free(connection);
3459 if(todo > sizeof(buf)) {
3463 ssize_t result = read(aio->fd, buf, todo);
3466 sent = utcp_send(connection, buf, result);
3476 /* If the buffer is now completely sent, call the callback and dispose of it. */
3477 if(aio->done >= aio->len) {
3478 channel->aio_send = aio->next;
3479 aio_signal(mesh, channel, aio);
3483 if(channel->poll_cb) {
3484 channel->poll_cb(mesh, channel, len);
3486 utcp_set_poll_cb(connection, NULL);
3491 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3492 if(!mesh || !channel) {
3493 meshlink_errno = MESHLINK_EINVAL;
3497 pthread_mutex_lock(&mesh->mutex);
3498 channel->poll_cb = cb;
3499 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3500 pthread_mutex_unlock(&mesh->mutex);
3503 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3505 meshlink_errno = MESHLINK_EINVAL;
3509 pthread_mutex_lock(&mesh->mutex);
3510 mesh->channel_accept_cb = cb;
3511 mesh->receive_cb = channel_receive;
3513 for splay_each(node_t, n, mesh->nodes) {
3514 if(!n->utcp && n != mesh->self) {
3515 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3519 pthread_mutex_unlock(&mesh->mutex);
3522 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3526 meshlink_errno = MESHLINK_EINVAL;
3530 pthread_mutex_lock(&mesh->mutex);
3531 utcp_set_sndbuf(channel->c, size);
3532 pthread_mutex_unlock(&mesh->mutex);
3535 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3539 meshlink_errno = MESHLINK_EINVAL;
3543 pthread_mutex_lock(&mesh->mutex);
3544 utcp_set_rcvbuf(channel->c, size);
3545 pthread_mutex_unlock(&mesh->mutex);
3548 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) {
3550 abort(); // TODO: handle non-NULL data
3553 if(!mesh || !node) {
3554 meshlink_errno = MESHLINK_EINVAL;
3558 pthread_mutex_lock(&mesh->mutex);
3560 node_t *n = (node_t *)node;
3563 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3564 mesh->receive_cb = channel_receive;
3567 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3568 pthread_mutex_unlock(&mesh->mutex);
3573 if(n->status.blacklisted) {
3574 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3575 meshlink_errno = MESHLINK_EBLACKLISTED;
3576 pthread_mutex_unlock(&mesh->mutex);
3580 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3582 channel->receive_cb = cb;
3585 channel->priv = (void *)data;
3588 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3590 pthread_mutex_unlock(&mesh->mutex);
3593 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3601 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) {
3602 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3605 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3606 if(!mesh || !channel) {
3607 meshlink_errno = MESHLINK_EINVAL;
3611 pthread_mutex_lock(&mesh->mutex);
3612 utcp_shutdown(channel->c, direction);
3613 pthread_mutex_unlock(&mesh->mutex);
3616 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3617 if(!mesh || !channel) {
3618 meshlink_errno = MESHLINK_EINVAL;
3622 pthread_mutex_lock(&mesh->mutex);
3624 utcp_close(channel->c);
3626 /* Clean up any outstanding AIO buffers. */
3627 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3629 aio_signal(mesh, channel, aio);
3633 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3635 aio_signal(mesh, channel, aio);
3639 pthread_mutex_unlock(&mesh->mutex);
3644 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3645 if(!mesh || !channel) {
3646 meshlink_errno = MESHLINK_EINVAL;
3655 meshlink_errno = MESHLINK_EINVAL;
3659 // TODO: more finegrained locking.
3660 // Ideally we want to put the data into the UTCP connection's send buffer.
3661 // Then, preferably only if there is room in the receiver window,
3662 // kick the meshlink thread to go send packets.
3666 pthread_mutex_lock(&mesh->mutex);
3668 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3669 if(channel->aio_send) {
3672 retval = utcp_send(channel->c, data, len);
3675 pthread_mutex_unlock(&mesh->mutex);
3678 meshlink_errno = MESHLINK_ENETWORK;
3684 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) {
3685 if(!mesh || !channel) {
3686 meshlink_errno = MESHLINK_EINVAL;
3691 meshlink_errno = MESHLINK_EINVAL;
3695 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3698 aio->cb.buffer = cb;
3701 pthread_mutex_lock(&mesh->mutex);
3703 /* Append the AIO buffer descriptor to the end of the chain */
3704 meshlink_aio_buffer_t **p = &channel->aio_send;
3712 /* Ensure the poll callback is set, and call it right now to push data if possible */
3713 utcp_set_poll_cb(channel->c, channel_poll);
3714 channel_poll(channel->c, len);
3716 pthread_mutex_unlock(&mesh->mutex);
3721 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) {
3722 if(!mesh || !channel) {
3723 meshlink_errno = MESHLINK_EINVAL;
3727 if(!len || fd == -1) {
3728 meshlink_errno = MESHLINK_EINVAL;
3732 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3738 pthread_mutex_lock(&mesh->mutex);
3740 /* Append the AIO buffer descriptor to the end of the chain */
3741 meshlink_aio_buffer_t **p = &channel->aio_send;
3749 /* Ensure the poll callback is set, and call it right now to push data if possible */
3750 utcp_set_poll_cb(channel->c, channel_poll);
3751 channel_poll(channel->c, len);
3753 pthread_mutex_unlock(&mesh->mutex);
3758 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) {
3759 if(!mesh || !channel) {
3760 meshlink_errno = MESHLINK_EINVAL;
3765 meshlink_errno = MESHLINK_EINVAL;
3769 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3772 aio->cb.buffer = cb;
3775 pthread_mutex_lock(&mesh->mutex);
3777 /* Append the AIO buffer descriptor to the end of the chain */
3778 meshlink_aio_buffer_t **p = &channel->aio_receive;
3786 pthread_mutex_unlock(&mesh->mutex);
3791 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) {
3792 if(!mesh || !channel) {
3793 meshlink_errno = MESHLINK_EINVAL;
3797 if(!len || fd == -1) {
3798 meshlink_errno = MESHLINK_EINVAL;
3802 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3808 pthread_mutex_lock(&mesh->mutex);
3810 /* Append the AIO buffer descriptor to the end of the chain */
3811 meshlink_aio_buffer_t **p = &channel->aio_receive;
3819 pthread_mutex_unlock(&mesh->mutex);
3824 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3825 if(!mesh || !channel) {
3826 meshlink_errno = MESHLINK_EINVAL;
3830 return channel->c->flags;
3833 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3834 if(!mesh || !channel) {
3835 meshlink_errno = MESHLINK_EINVAL;
3839 return utcp_get_sendq(channel->c);
3842 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3843 if(!mesh || !channel) {
3844 meshlink_errno = MESHLINK_EINVAL;
3848 return utcp_get_recvq(channel->c);
3851 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3852 if(!mesh || !node) {
3853 meshlink_errno = MESHLINK_EINVAL;
3857 node_t *n = (node_t *)node;
3859 pthread_mutex_lock(&mesh->mutex);
3862 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3865 utcp_set_user_timeout(n->utcp, timeout);
3867 pthread_mutex_unlock(&mesh->mutex);
3870 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3871 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3872 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3875 if(mesh->node_status_cb) {
3876 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3879 if(mesh->node_pmtu_cb) {
3880 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3884 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3885 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3886 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3890 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3891 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3895 n->status.duplicate = true;
3896 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3899 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3903 meshlink_errno = MESHLINK_EINVAL;
3907 pthread_mutex_lock(&mesh->mutex);
3909 if(mesh->discovery == enable) {
3913 if(mesh->threadstarted) {
3915 discovery_start(mesh);
3917 discovery_stop(mesh);
3921 mesh->discovery = enable;
3924 pthread_mutex_unlock(&mesh->mutex);
3928 meshlink_errno = MESHLINK_ENOTSUP;
3932 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3933 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3934 meshlink_errno = EINVAL;
3938 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3939 meshlink_errno = EINVAL;
3943 pthread_mutex_lock(&mesh->mutex);
3944 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3945 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3946 pthread_mutex_unlock(&mesh->mutex);
3949 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3950 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3951 meshlink_errno = EINVAL;
3955 if(fast_retry_period < 0) {
3956 meshlink_errno = EINVAL;
3960 pthread_mutex_lock(&mesh->mutex);
3961 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
3962 pthread_mutex_unlock(&mesh->mutex);
3965 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
3967 meshlink_errno = EINVAL;
3971 pthread_mutex_lock(&mesh->mutex);
3972 mesh->inviter_commits_first = inviter_commits_first;
3973 pthread_mutex_unlock(&mesh->mutex);
3976 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3979 if(!mesh->connections || !mesh->loop.running) {
3986 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
3987 // We should only call the callback function if we are in the background thread.
3988 if(!mesh->error_cb) {
3992 if(!mesh->threadstarted) {
3996 if(mesh->thread == pthread_self()) {
3997 mesh->error_cb(mesh, meshlink_errno);
4001 static void __attribute__((constructor)) meshlink_init(void) {
4005 static void __attribute__((destructor)) meshlink_exit(void) {