2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.h"
43 #define MSG_NOSIGNAL 0
45 __thread meshlink_errno_t meshlink_errno;
46 meshlink_log_cb_t global_log_cb;
47 meshlink_log_level_t global_log_level;
49 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
51 static int rstrip(char *value) {
52 int len = strlen(value);
54 while(len && strchr("\t\r\n ", value[len - 1])) {
61 static void get_canonical_address(node_t *n, char **hostname, char **port) {
62 if(!n->canonical_address) {
66 *hostname = xstrdup(n->canonical_address);
67 char *space = strchr(*hostname, ' ');
71 *port = xstrdup(space);
75 static bool is_valid_hostname(const char *hostname) {
80 for(const char *p = hostname; *p; p++) {
81 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
89 static bool is_valid_port(const char *port) {
96 unsigned long int result = strtoul(port, &end, 10);
97 return result && result < 65536 && !*end;
100 for(const char *p = port; *p; p++) {
101 if(!(isalnum(*p) || *p == '-')) {
109 static void set_timeout(int sock, int timeout) {
114 tv.tv_sec = timeout / 1000;
115 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
117 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
118 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
121 struct socket_in_netns_params {
130 static void *socket_in_netns_thread(void *arg) {
131 struct socket_in_netns_params *params = arg;
133 if(setns(params->netns, CLONE_NEWNET) == -1) {
134 meshlink_errno = MESHLINK_EINVAL;
138 params->fd = socket(params->domain, params->type, params->protocol);
144 static int socket_in_netns(int domain, int type, int protocol, int netns) {
146 return socket(domain, type, protocol);
150 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
154 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
155 pthread_join(thr, NULL);
165 // Find out what local address a socket would use if we connect to the given address.
166 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
167 // of both endpoints, but this will actually not send any UDP packet.
168 static bool getlocaladdr(char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
169 struct addrinfo *rai = NULL;
170 const struct addrinfo hint = {
171 .ai_family = AF_UNSPEC,
172 .ai_socktype = SOCK_DGRAM,
173 .ai_protocol = IPPROTO_UDP,
176 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
180 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
187 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
195 if(getsockname(sock, &sa->sa, salen)) {
204 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
206 socklen_t salen = sizeof(sa);
208 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
212 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
219 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
220 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
223 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
224 char *hostname = NULL;
226 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
227 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
228 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
231 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
232 if(family != AF_UNSPEC && aip->ai_family != family) {
236 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
239 set_timeout(s, 5000);
241 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
248 send(s, request, sizeof(request) - 1, 0);
249 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
254 if(line[len - 1] == '\n') {
258 char *p = strrchr(line, '\n');
261 hostname = xstrdup(p + 1);
277 // Check that the hostname is reasonable
278 if(hostname && !is_valid_hostname(hostname)) {
284 meshlink_errno = MESHLINK_ERESOLV;
290 static bool is_localaddr(sockaddr_t *sa) {
291 switch(sa->sa.sa_family) {
293 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
296 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
297 return first == 0 || (first & 0xffc0) == 0xfe80;
305 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
308 // Determine address of the local interface used for outgoing connections.
309 char localaddr[NI_MAXHOST];
310 bool success = false;
312 if(family == AF_INET) {
313 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
314 } else if(family == AF_INET6) {
315 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
318 #ifdef HAVE_GETIFADDRS
321 struct ifaddrs *ifa = NULL;
324 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
325 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
327 if(sa->sa.sa_family != family) {
331 if(is_localaddr(sa)) {
335 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
347 meshlink_errno = MESHLINK_ENETWORK;
351 return xstrdup(localaddr);
354 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
355 for(int i = 0; i < n; i++) {
360 // Ignore duplicate hostnames
363 for(int j = 0; j < i; j++) {
368 if(strcmp(host[i], host[j])) {
372 if(strcmp(port[i], port[j])) {
380 if(found || !is_valid_hostname(host[i])) {
390 // This gets the hostname part for use in invitation URLs
391 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
392 char *hostname[4] = {NULL};
393 char *port[4] = {NULL};
394 char *hostport = NULL;
396 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
397 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
400 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
401 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
404 // Add local addresses if requested
405 if(flags & MESHLINK_INVITE_LOCAL) {
406 if(flags & MESHLINK_INVITE_IPV4) {
407 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
410 if(flags & MESHLINK_INVITE_IPV6) {
411 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
415 // Add public/canonical addresses if requested
416 if(flags & MESHLINK_INVITE_PUBLIC) {
417 // Try the CanonicalAddress first
418 get_canonical_address(mesh->self, &hostname[2], &port[2]);
421 if(flags & MESHLINK_INVITE_IPV4) {
422 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
425 if(flags & MESHLINK_INVITE_IPV6) {
426 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
431 for(int i = 0; i < 4; i++) {
432 // Ensure we always have a port number
433 if(hostname[i] && !port[i]) {
434 port[i] = xstrdup(mesh->myport);
438 remove_duplicate_hostnames(hostname, port, 4);
440 // Resolve the hostnames
441 for(int i = 0; i < 4; i++) {
446 // Convert what we have to a sockaddr
447 struct addrinfo *ai_in, *ai_out;
448 struct addrinfo hint = {
449 .ai_family = AF_UNSPEC,
450 .ai_flags = AI_NUMERICSERV,
451 .ai_socktype = SOCK_STREAM,
453 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
459 // Remember the address
460 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)ai_in->ai_addr);
462 if(flags & MESHLINK_INVITE_NUMERIC) {
463 // We don't need to do any further conversion
468 // Convert it to a hostname
469 char resolved_host[NI_MAXHOST];
470 char resolved_port[NI_MAXSERV];
471 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
473 if(err || !is_valid_hostname(resolved_host)) {
478 // Convert the hostname back to a sockaddr
479 hint.ai_family = ai_in->ai_family;
480 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
487 // Check if it's still the same sockaddr
488 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
490 freeaddrinfo(ai_out);
494 // Yes: replace the hostname with the resolved one
496 hostname[i] = xstrdup(resolved_host);
499 freeaddrinfo(ai_out);
502 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
503 remove_duplicate_hostnames(hostname, port, 4);
505 // Concatenate all unique address to the hostport string
506 for(int i = 0; i < 4; i++) {
511 // Append the address to the hostport string
513 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
515 hostport = newhostport;
524 static bool try_bind(int port) {
525 struct addrinfo *ai = NULL;
526 struct addrinfo hint = {
527 .ai_flags = AI_PASSIVE,
528 .ai_family = AF_UNSPEC,
529 .ai_socktype = SOCK_STREAM,
530 .ai_protocol = IPPROTO_TCP,
534 snprintf(portstr, sizeof(portstr), "%d", port);
536 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
541 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
542 int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
549 int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
562 static int check_port(meshlink_handle_t *mesh) {
563 for(int i = 0; i < 1000; i++) {
564 int port = 0x1000 + prng(mesh, 0x8000);
568 xasprintf(&mesh->myport, "%d", port);
573 meshlink_errno = MESHLINK_ENETWORK;
574 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
578 static bool write_main_config_files(meshlink_handle_t *mesh) {
579 if(!mesh->confbase) {
585 /* Write the main config file */
586 packmsg_output_t out = {buf, sizeof buf};
588 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
589 packmsg_add_str(&out, mesh->name);
590 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
591 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
592 packmsg_add_uint16(&out, atoi(mesh->myport));
594 if(!packmsg_output_ok(&out)) {
598 config_t config = {buf, packmsg_output_size(&out, buf)};
600 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
604 /* Write our own host config file */
605 if(!node_write_config(mesh, mesh->self)) {
613 meshlink_handle_t *mesh;
615 char cookie[18 + 32];
626 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
627 meshlink_handle_t *mesh = state->mesh;
628 packmsg_input_t in = {buf, len};
629 uint32_t version = packmsg_get_uint32(&in);
631 if(version != MESHLINK_INVITATION_VERSION) {
632 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
636 char *name = packmsg_get_str_dup(&in);
637 packmsg_skip_element(&in); /* submesh */
638 dev_class_t devclass = packmsg_get_int32(&in);
639 uint32_t count = packmsg_get_array(&in);
642 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
646 if(!check_id(name)) {
647 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
653 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
659 free(mesh->self->name);
661 mesh->self->name = xstrdup(name);
662 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
664 // Initialize configuration directory
665 if(!config_init(mesh, "current")) {
669 if(!write_main_config_files(mesh)) {
673 // Write host config files
674 for(uint32_t i = 0; i < count; i++) {
676 uint32_t len = packmsg_get_bin_raw(&in, &data);
679 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
683 packmsg_input_t in2 = {data, len};
684 uint32_t version = packmsg_get_uint32(&in2);
685 char *name = packmsg_get_str_dup(&in2);
687 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
689 packmsg_input_invalidate(&in);
693 if(!check_id(name)) {
698 if(!strcmp(name, mesh->name)) {
699 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
701 meshlink_errno = MESHLINK_EPEER;
705 node_t *n = new_node();
708 config_t config = {data, len};
710 if(!node_read_from_config(mesh, n, &config)) {
712 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
713 meshlink_errno = MESHLINK_EPEER;
718 /* The first host config file is of the inviter itself;
719 * remember the address we are currently using for the invitation connection.
722 socklen_t salen = sizeof(sa);
724 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
725 node_add_recent_address(mesh, n, &sa);
729 /* Clear the reachability times, since we ourself have never seen these nodes yet */
730 n->last_reachable = 0;
731 n->last_unreachable = 0;
733 if(!node_write_config(mesh, n)) {
741 /* Ensure the configuration directory metadata is on disk */
742 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
746 if(!mesh->inviter_commits_first) {
747 devtool_set_inviter_commits_first(false);
750 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
752 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
757 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
759 join_state_t *state = handle;
760 const char *ptr = data;
763 int result = send(state->sock, ptr, len, 0);
765 if(result == -1 && errno == EINTR) {
767 } else if(result <= 0) {
778 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
779 join_state_t *state = handle;
780 meshlink_handle_t *mesh = state->mesh;
782 if(mesh->inviter_commits_first) {
784 case SPTPS_HANDSHAKE:
785 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
791 if(!finalize_join(state, msg, len)) {
795 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
796 shutdown(state->sock, SHUT_RDWR);
797 state->success = true;
805 case SPTPS_HANDSHAKE:
806 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
809 return finalize_join(state, msg, len);
812 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
813 shutdown(state->sock, SHUT_RDWR);
814 state->success = true;
825 static bool recvline(join_state_t *state) {
826 char *newline = NULL;
828 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
829 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
831 if(result == -1 && errno == EINTR) {
833 } else if(result <= 0) {
837 state->blen += result;
840 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
844 size_t len = newline - state->buffer;
846 memcpy(state->line, state->buffer, len);
847 state->line[len] = 0;
848 memmove(state->buffer, newline + 1, state->blen - len - 1);
849 state->blen -= len + 1;
854 static bool sendline(int fd, char *format, ...) {
860 va_start(ap, format);
861 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
864 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
872 int result = send(fd, p, blen, MSG_NOSIGNAL);
874 if(result == -1 && errno == EINTR) {
876 } else if(result <= 0) {
887 static const char *errstr[] = {
888 [MESHLINK_OK] = "No error",
889 [MESHLINK_EINVAL] = "Invalid argument",
890 [MESHLINK_ENOMEM] = "Out of memory",
891 [MESHLINK_ENOENT] = "No such node",
892 [MESHLINK_EEXIST] = "Node already exists",
893 [MESHLINK_EINTERNAL] = "Internal error",
894 [MESHLINK_ERESOLV] = "Could not resolve hostname",
895 [MESHLINK_ESTORAGE] = "Storage error",
896 [MESHLINK_ENETWORK] = "Network error",
897 [MESHLINK_EPEER] = "Error communicating with peer",
898 [MESHLINK_ENOTSUP] = "Operation not supported",
899 [MESHLINK_EBUSY] = "MeshLink instance already in use",
900 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
903 const char *meshlink_strerror(meshlink_errno_t err) {
904 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
905 return "Invalid error code";
911 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
912 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
914 mesh->private_key = ecdsa_generate();
915 mesh->invitation_key = ecdsa_generate();
917 if(!mesh->private_key || !mesh->invitation_key) {
918 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
919 meshlink_errno = MESHLINK_EINTERNAL;
923 logger(mesh, MESHLINK_DEBUG, "Done.\n");
928 static struct timeval idle(event_loop_t *loop, void *data) {
930 meshlink_handle_t *mesh = data;
931 struct timeval t, tmin = {3600, 0};
933 for splay_each(node_t, n, mesh->nodes) {
938 t = utcp_timeout(n->utcp);
940 if(timercmp(&t, &tmin, <)) {
948 // Get our local address(es) by simulating connecting to an Internet host.
949 static void add_local_addresses(meshlink_handle_t *mesh) {
951 sa.storage.ss_family = AF_UNKNOWN;
952 socklen_t salen = sizeof(sa);
956 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
957 sa.in.sin_port = ntohs(atoi(mesh->myport));
958 node_add_recent_address(mesh, mesh->self, &sa);
965 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
966 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
967 node_add_recent_address(mesh, mesh->self, &sa);
971 static bool meshlink_setup(meshlink_handle_t *mesh) {
972 if(!config_destroy(mesh->confbase, "new")) {
973 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
974 meshlink_errno = MESHLINK_ESTORAGE;
978 if(!config_destroy(mesh->confbase, "old")) {
979 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
980 meshlink_errno = MESHLINK_ESTORAGE;
984 if(!config_init(mesh, "current")) {
985 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
986 meshlink_errno = MESHLINK_ESTORAGE;
990 if(!ecdsa_keygen(mesh)) {
991 meshlink_errno = MESHLINK_EINTERNAL;
995 if(check_port(mesh) == 0) {
996 meshlink_errno = MESHLINK_ENETWORK;
1000 /* Create a node for ourself */
1002 mesh->self = new_node();
1003 mesh->self->name = xstrdup(mesh->name);
1004 mesh->self->devclass = mesh->devclass;
1005 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1006 mesh->self->session_id = mesh->session_id;
1008 if(!write_main_config_files(mesh)) {
1009 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1010 meshlink_errno = MESHLINK_ESTORAGE;
1014 /* Ensure the configuration directory metadata is on disk */
1015 if(!config_sync(mesh, "current")) {
1022 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1025 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1026 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1030 packmsg_input_t in = {config.buf, config.len};
1031 const void *private_key;
1032 const void *invitation_key;
1034 uint32_t version = packmsg_get_uint32(&in);
1035 char *name = packmsg_get_str_dup(&in);
1036 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1037 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1038 uint16_t myport = packmsg_get_uint16(&in);
1040 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1041 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1043 config_free(&config);
1049 // TODO: check this?
1050 if(mesh->name && strcmp(mesh->name, name)) {
1051 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1052 meshlink_errno = MESHLINK_ESTORAGE;
1054 config_free(&config);
1062 xasprintf(&mesh->myport, "%u", myport);
1063 mesh->private_key = ecdsa_set_private_key(private_key);
1064 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1065 config_free(&config);
1067 /* Create a node for ourself and read our host configuration file */
1069 mesh->self = new_node();
1070 mesh->self->name = xstrdup(name);
1071 mesh->self->devclass = mesh->devclass;
1072 mesh->self->session_id = mesh->session_id;
1074 if(!node_read_public_key(mesh, mesh->self)) {
1075 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1076 meshlink_errno = MESHLINK_ESTORAGE;
1077 free_node(mesh->self);
1086 static void *setup_network_in_netns_thread(void *arg) {
1087 meshlink_handle_t *mesh = arg;
1089 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1093 bool success = setup_network(mesh);
1094 add_local_addresses(mesh);
1095 return success ? arg : NULL;
1097 #endif // HAVE_SETNS
1099 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1100 if(!confbase || !*confbase) {
1101 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1102 meshlink_errno = MESHLINK_EINVAL;
1106 if(!appname || !*appname) {
1107 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1108 meshlink_errno = MESHLINK_EINVAL;
1112 if(strchr(appname, ' ')) {
1113 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1114 meshlink_errno = MESHLINK_EINVAL;
1118 if(!name || !*name) {
1119 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1120 meshlink_errno = MESHLINK_EINVAL;
1124 if(!check_id(name)) {
1125 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1126 meshlink_errno = MESHLINK_EINVAL;
1130 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1131 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1132 meshlink_errno = MESHLINK_EINVAL;
1136 meshlink_open_params_t *params = xzalloc(sizeof * params);
1138 params->confbase = xstrdup(confbase);
1139 params->name = xstrdup(name);
1140 params->appname = xstrdup(appname);
1141 params->devclass = devclass;
1147 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1149 meshlink_errno = MESHLINK_EINVAL;
1153 params->netns = netns;
1158 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1160 meshlink_errno = MESHLINK_EINVAL;
1164 if((!key && keylen) || (key && !keylen)) {
1165 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1166 meshlink_errno = MESHLINK_EINVAL;
1171 params->keylen = keylen;
1176 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1177 if(!mesh || !new_key || !new_keylen) {
1178 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1179 meshlink_errno = MESHLINK_EINVAL;
1183 pthread_mutex_lock(&mesh->mutex);
1185 // Create hash for the new key
1186 void *new_config_key;
1187 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1189 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1190 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1191 meshlink_errno = MESHLINK_EINTERNAL;
1192 pthread_mutex_unlock(&mesh->mutex);
1196 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1198 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1199 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1200 meshlink_errno = MESHLINK_ESTORAGE;
1201 pthread_mutex_unlock(&mesh->mutex);
1205 devtool_keyrotate_probe(1);
1207 // Rename confbase/current/ to confbase/old
1209 if(!config_rename(mesh, "current", "old")) {
1210 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1211 meshlink_errno = MESHLINK_ESTORAGE;
1212 pthread_mutex_unlock(&mesh->mutex);
1216 devtool_keyrotate_probe(2);
1218 // Rename confbase/new/ to confbase/current
1220 if(!config_rename(mesh, "new", "current")) {
1221 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1222 meshlink_errno = MESHLINK_ESTORAGE;
1223 pthread_mutex_unlock(&mesh->mutex);
1227 devtool_keyrotate_probe(3);
1229 // Cleanup the "old" confbase sub-directory
1231 if(!config_destroy(mesh->confbase, "old")) {
1232 pthread_mutex_unlock(&mesh->mutex);
1236 // Change the mesh handle key with new key
1238 free(mesh->config_key);
1239 mesh->config_key = new_config_key;
1241 pthread_mutex_unlock(&mesh->mutex);
1246 void meshlink_open_params_free(meshlink_open_params_t *params) {
1248 meshlink_errno = MESHLINK_EINVAL;
1252 free(params->confbase);
1254 free(params->appname);
1259 /// Device class traits
1260 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1261 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1262 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1263 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1264 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1267 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1268 if(!confbase || !*confbase) {
1269 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1270 meshlink_errno = MESHLINK_EINVAL;
1274 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1275 meshlink_open_params_t params;
1276 memset(¶ms, 0, sizeof(params));
1278 params.confbase = (char *)confbase;
1279 params.name = (char *)name;
1280 params.appname = (char *)appname;
1281 params.devclass = devclass;
1284 return meshlink_open_ex(¶ms);
1287 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) {
1288 if(!confbase || !*confbase) {
1289 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1290 meshlink_errno = MESHLINK_EINVAL;
1294 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1295 meshlink_open_params_t params;
1296 memset(¶ms, 0, sizeof(params));
1298 params.confbase = (char *)confbase;
1299 params.name = (char *)name;
1300 params.appname = (char *)appname;
1301 params.devclass = devclass;
1304 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1308 return meshlink_open_ex(¶ms);
1311 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1312 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1313 meshlink_open_params_t params;
1314 memset(¶ms, 0, sizeof(params));
1316 params.name = (char *)name;
1317 params.appname = (char *)appname;
1318 params.devclass = devclass;
1321 return meshlink_open_ex(¶ms);
1324 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1325 // Validate arguments provided by the application
1326 bool usingname = false;
1328 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1330 if(!params->appname || !*params->appname) {
1331 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1332 meshlink_errno = MESHLINK_EINVAL;
1336 if(strchr(params->appname, ' ')) {
1337 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1338 meshlink_errno = MESHLINK_EINVAL;
1342 if(!params->name || !*params->name) {
1343 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1345 } else { //check name only if there is a name != NULL
1347 if(!check_id(params->name)) {
1348 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1349 meshlink_errno = MESHLINK_EINVAL;
1356 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1357 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1358 meshlink_errno = MESHLINK_EINVAL;
1362 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1363 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1364 meshlink_errno = MESHLINK_EINVAL;
1368 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1370 if(params->confbase) {
1371 mesh->confbase = xstrdup(params->confbase);
1374 mesh->appname = xstrdup(params->appname);
1375 mesh->devclass = params->devclass;
1376 mesh->discovery = true;
1377 mesh->invitation_timeout = 604800; // 1 week
1378 mesh->netns = params->netns;
1379 mesh->submeshes = NULL;
1380 mesh->log_cb = global_log_cb;
1381 mesh->log_level = global_log_level;
1383 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1386 randomize(&mesh->session_id, sizeof(mesh->session_id));
1387 } while(mesh->session_id == 0);
1389 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1392 mesh->name = xstrdup(params->name);
1397 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1399 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1400 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1401 meshlink_close(mesh);
1402 meshlink_errno = MESHLINK_EINTERNAL;
1408 pthread_mutexattr_t attr;
1409 pthread_mutexattr_init(&attr);
1410 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1411 pthread_mutex_init(&mesh->mutex, &attr);
1413 mesh->threadstarted = false;
1414 event_loop_init(&mesh->loop);
1415 mesh->loop.data = mesh;
1417 meshlink_queue_init(&mesh->outpacketqueue);
1419 // Atomically lock the configuration directory.
1420 if(!main_config_lock(mesh)) {
1421 meshlink_close(mesh);
1425 // If no configuration exists yet, create it.
1427 if(!meshlink_confbase_exists(mesh)) {
1428 if(!meshlink_setup(mesh)) {
1429 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1430 meshlink_close(mesh);
1434 if(!meshlink_read_config(mesh)) {
1435 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1436 meshlink_close(mesh);
1442 struct WSAData wsa_state;
1443 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1446 // Setup up everything
1447 // TODO: we should not open listening sockets yet
1449 bool success = false;
1451 if(mesh->netns != -1) {
1455 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1456 void *retval = NULL;
1457 success = pthread_join(thr, &retval) == 0 && retval;
1461 meshlink_errno = MESHLINK_EINTERNAL;
1464 #endif // HAVE_SETNS
1466 success = setup_network(mesh);
1467 add_local_addresses(mesh);
1471 meshlink_close(mesh);
1472 meshlink_errno = MESHLINK_ENETWORK;
1476 add_local_addresses(mesh);
1478 if(!node_write_config(mesh, mesh->self)) {
1479 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1483 idle_set(&mesh->loop, idle, mesh);
1485 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1489 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1490 meshlink_submesh_t *s = NULL;
1493 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1494 meshlink_errno = MESHLINK_EINVAL;
1498 if(!submesh || !*submesh) {
1499 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1500 meshlink_errno = MESHLINK_EINVAL;
1505 pthread_mutex_lock(&mesh->mutex);
1507 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1509 pthread_mutex_unlock(&mesh->mutex);
1514 static void *meshlink_main_loop(void *arg) {
1515 meshlink_handle_t *mesh = arg;
1517 if(mesh->netns != -1) {
1520 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1521 pthread_cond_signal(&mesh->cond);
1526 pthread_cond_signal(&mesh->cond);
1528 #endif // HAVE_SETNS
1533 if(mesh->discovery) {
1534 discovery_start(mesh);
1539 pthread_mutex_lock(&mesh->mutex);
1541 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1542 pthread_cond_broadcast(&mesh->cond);
1544 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1546 pthread_mutex_unlock(&mesh->mutex);
1551 if(mesh->discovery) {
1552 discovery_stop(mesh);
1560 bool meshlink_start(meshlink_handle_t *mesh) {
1562 assert(mesh->private_key);
1565 meshlink_errno = MESHLINK_EINVAL;
1569 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1571 pthread_mutex_lock(&mesh->mutex);
1573 assert(mesh->self->ecdsa);
1574 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1576 if(mesh->threadstarted) {
1577 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1578 pthread_mutex_unlock(&mesh->mutex);
1582 if(mesh->listen_socket[0].tcp.fd < 0) {
1583 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1584 meshlink_errno = MESHLINK_ENETWORK;
1588 // TODO: open listening sockets first
1590 //Check that a valid name is set
1592 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1593 meshlink_errno = MESHLINK_EINVAL;
1594 pthread_mutex_unlock(&mesh->mutex);
1598 init_outgoings(mesh);
1600 // Start the main thread
1602 event_loop_start(&mesh->loop);
1604 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1605 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1606 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1607 meshlink_errno = MESHLINK_EINTERNAL;
1608 event_loop_stop(&mesh->loop);
1609 pthread_mutex_unlock(&mesh->mutex);
1613 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1614 mesh->threadstarted = true;
1616 // Ensure we are considered reachable
1619 pthread_mutex_unlock(&mesh->mutex);
1623 void meshlink_stop(meshlink_handle_t *mesh) {
1625 meshlink_errno = MESHLINK_EINVAL;
1629 pthread_mutex_lock(&mesh->mutex);
1630 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1632 // Shut down the main thread
1633 event_loop_stop(&mesh->loop);
1635 // Send ourselves a UDP packet to kick the event loop
1636 for(int i = 0; i < mesh->listen_sockets; i++) {
1638 socklen_t salen = sizeof(sa);
1640 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1641 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1645 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1646 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1650 if(mesh->threadstarted) {
1651 // Wait for the main thread to finish
1652 pthread_mutex_unlock(&mesh->mutex);
1653 pthread_join(mesh->thread, NULL);
1654 pthread_mutex_lock(&mesh->mutex);
1656 mesh->threadstarted = false;
1659 // Close all metaconnections
1660 if(mesh->connections) {
1661 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1663 connection_t *c = node->data;
1665 terminate_connection(mesh, c, false);
1669 exit_outgoings(mesh);
1671 // Ensure we are considered unreachable
1676 // Try to write out any changed node config files, ignore errors at this point.
1678 for splay_each(node_t, n, mesh->nodes) {
1679 if(n->status.dirty) {
1680 n->status.dirty = !node_write_config(mesh, n);
1685 pthread_mutex_unlock(&mesh->mutex);
1688 void meshlink_close(meshlink_handle_t *mesh) {
1690 meshlink_errno = MESHLINK_EINVAL;
1694 // stop can be called even if mesh has not been started
1695 meshlink_stop(mesh);
1697 // lock is not released after this
1698 pthread_mutex_lock(&mesh->mutex);
1700 // Close and free all resources used.
1702 close_network_connections(mesh);
1704 logger(mesh, MESHLINK_INFO, "Terminating");
1706 event_loop_exit(&mesh->loop);
1710 if(mesh->confbase) {
1716 ecdsa_free(mesh->invitation_key);
1718 if(mesh->netns != -1) {
1722 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1726 meshlink_queue_exit(&mesh->outpacketqueue);
1729 free(mesh->appname);
1730 free(mesh->confbase);
1731 free(mesh->config_key);
1732 ecdsa_free(mesh->private_key);
1734 main_config_unlock(mesh);
1736 pthread_mutex_unlock(&mesh->mutex);
1737 pthread_mutex_destroy(&mesh->mutex);
1739 memset(mesh, 0, sizeof(*mesh));
1744 bool meshlink_destroy(const char *confbase) {
1746 meshlink_errno = MESHLINK_EINVAL;
1750 /* Exit early if the confbase directory itself doesn't exist */
1751 if(access(confbase, F_OK) && errno == ENOENT) {
1755 /* Take the lock the same way meshlink_open() would. */
1756 char lockfilename[PATH_MAX];
1757 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1759 FILE *lockfile = fopen(lockfilename, "w+");
1762 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1763 meshlink_errno = MESHLINK_ESTORAGE;
1768 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1772 // TODO: use _locking()?
1775 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1776 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1778 meshlink_errno = MESHLINK_EBUSY;
1784 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1785 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1789 if(unlink(lockfilename)) {
1790 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1792 meshlink_errno = MESHLINK_ESTORAGE;
1798 if(!sync_path(confbase)) {
1799 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1800 meshlink_errno = MESHLINK_ESTORAGE;
1807 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1809 meshlink_errno = MESHLINK_EINVAL;
1813 pthread_mutex_lock(&mesh->mutex);
1814 mesh->receive_cb = cb;
1815 pthread_mutex_unlock(&mesh->mutex);
1818 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1820 meshlink_errno = MESHLINK_EINVAL;
1824 pthread_mutex_lock(&mesh->mutex);
1825 mesh->connection_try_cb = cb;
1826 pthread_mutex_unlock(&mesh->mutex);
1829 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1831 meshlink_errno = MESHLINK_EINVAL;
1835 pthread_mutex_lock(&mesh->mutex);
1836 mesh->node_status_cb = cb;
1837 pthread_mutex_unlock(&mesh->mutex);
1840 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1842 meshlink_errno = MESHLINK_EINVAL;
1846 pthread_mutex_lock(&mesh->mutex);
1847 mesh->node_pmtu_cb = cb;
1848 pthread_mutex_unlock(&mesh->mutex);
1851 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1853 meshlink_errno = MESHLINK_EINVAL;
1857 pthread_mutex_lock(&mesh->mutex);
1858 mesh->node_duplicate_cb = cb;
1859 pthread_mutex_unlock(&mesh->mutex);
1862 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1864 pthread_mutex_lock(&mesh->mutex);
1866 mesh->log_level = cb ? level : 0;
1867 pthread_mutex_unlock(&mesh->mutex);
1870 global_log_level = cb ? level : 0;
1874 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1876 meshlink_errno = MESHLINK_EINVAL;
1880 pthread_mutex_lock(&mesh->mutex);
1881 mesh->error_cb = cb;
1882 pthread_mutex_unlock(&mesh->mutex);
1885 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1886 meshlink_packethdr_t *hdr;
1888 // Validate arguments
1889 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1890 meshlink_errno = MESHLINK_EINVAL;
1899 meshlink_errno = MESHLINK_EINVAL;
1903 node_t *n = (node_t *)destination;
1905 if(n->status.blacklisted) {
1906 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1907 meshlink_errno = MESHLINK_EBLACKLISTED;
1911 // Prepare the packet
1912 vpn_packet_t *packet = malloc(sizeof(*packet));
1915 meshlink_errno = MESHLINK_ENOMEM;
1919 packet->probe = false;
1920 packet->tcp = false;
1921 packet->len = len + sizeof(*hdr);
1923 hdr = (meshlink_packethdr_t *)packet->data;
1924 memset(hdr, 0, sizeof(*hdr));
1925 // leave the last byte as 0 to make sure strings are always
1926 // null-terminated if they are longer than the buffer
1927 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1928 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1930 memcpy(packet->data + sizeof(*hdr), data, len);
1933 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1935 meshlink_errno = MESHLINK_ENOMEM;
1939 // Notify event loop
1940 signal_trigger(&mesh->loop, &mesh->datafromapp);
1945 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1947 meshlink_handle_t *mesh = data;
1948 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1954 mesh->self->in_packets++;
1955 mesh->self->in_bytes += packet->len;
1956 route(mesh, mesh->self, packet);
1961 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1962 if(!mesh || !destination) {
1963 meshlink_errno = MESHLINK_EINVAL;
1967 pthread_mutex_lock(&mesh->mutex);
1969 node_t *n = (node_t *)destination;
1971 if(!n->status.reachable) {
1972 pthread_mutex_unlock(&mesh->mutex);
1975 } else if(n->mtuprobes > 30 && n->minmtu) {
1976 pthread_mutex_unlock(&mesh->mutex);
1979 pthread_mutex_unlock(&mesh->mutex);
1984 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1985 if(!mesh || !node) {
1986 meshlink_errno = MESHLINK_EINVAL;
1990 pthread_mutex_lock(&mesh->mutex);
1992 node_t *n = (node_t *)node;
1994 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1995 meshlink_errno = MESHLINK_EINTERNAL;
1996 pthread_mutex_unlock(&mesh->mutex);
2000 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2003 meshlink_errno = MESHLINK_EINTERNAL;
2006 pthread_mutex_unlock(&mesh->mutex);
2010 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2012 meshlink_errno = MESHLINK_EINVAL;
2016 return (meshlink_node_t *)mesh->self;
2019 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2020 if(!mesh || !name) {
2021 meshlink_errno = MESHLINK_EINVAL;
2027 pthread_mutex_lock(&mesh->mutex);
2028 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2029 pthread_mutex_unlock(&mesh->mutex);
2032 meshlink_errno = MESHLINK_ENOENT;
2035 return (meshlink_node_t *)n;
2038 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2039 if(!mesh || !name) {
2040 meshlink_errno = MESHLINK_EINVAL;
2044 meshlink_submesh_t *submesh = NULL;
2046 pthread_mutex_lock(&mesh->mutex);
2047 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2048 pthread_mutex_unlock(&mesh->mutex);
2051 meshlink_errno = MESHLINK_ENOENT;
2057 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2058 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2059 meshlink_errno = MESHLINK_EINVAL;
2063 meshlink_node_t **result;
2066 pthread_mutex_lock(&mesh->mutex);
2068 *nmemb = mesh->nodes->count;
2069 result = realloc(nodes, *nmemb * sizeof(*nodes));
2072 meshlink_node_t **p = result;
2074 for splay_each(node_t, n, mesh->nodes) {
2075 *p++ = (meshlink_node_t *)n;
2080 meshlink_errno = MESHLINK_ENOMEM;
2083 pthread_mutex_unlock(&mesh->mutex);
2088 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) {
2089 meshlink_node_t **result;
2091 pthread_mutex_lock(&mesh->mutex);
2095 for splay_each(node_t, n, mesh->nodes) {
2096 if(search_node(n, condition)) {
2103 pthread_mutex_unlock(&mesh->mutex);
2107 result = realloc(nodes, *nmemb * sizeof(*nodes));
2110 meshlink_node_t **p = result;
2112 for splay_each(node_t, n, mesh->nodes) {
2113 if(search_node(n, condition)) {
2114 *p++ = (meshlink_node_t *)n;
2120 meshlink_errno = MESHLINK_ENOMEM;
2123 pthread_mutex_unlock(&mesh->mutex);
2128 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2129 dev_class_t *devclass = (dev_class_t *)condition;
2131 if(*devclass == (dev_class_t)node->devclass) {
2138 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2139 if(condition == node->submesh) {
2151 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2152 const struct time_range *range = condition;
2153 time_t start = node->last_reachable;
2154 time_t end = node->last_unreachable;
2164 if(range->end >= range->start) {
2165 return start <= range->end && end >= range->start;
2167 return start > range->start || end < range->end;
2171 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) {
2172 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2173 meshlink_errno = MESHLINK_EINVAL;
2177 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2180 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2181 if(!mesh || !submesh || !nmemb) {
2182 meshlink_errno = MESHLINK_EINVAL;
2186 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2189 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) {
2190 if(!mesh || !nmemb) {
2191 meshlink_errno = MESHLINK_EINVAL;
2195 struct time_range range = {start, end};
2197 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2200 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2201 if(!mesh || !node) {
2202 meshlink_errno = MESHLINK_EINVAL;
2206 dev_class_t devclass;
2208 pthread_mutex_lock(&mesh->mutex);
2210 devclass = ((node_t *)node)->devclass;
2212 pthread_mutex_unlock(&mesh->mutex);
2217 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2218 if(!mesh || !node) {
2219 meshlink_errno = MESHLINK_EINVAL;
2223 node_t *n = (node_t *)node;
2225 meshlink_submesh_t *s;
2227 s = (meshlink_submesh_t *)n->submesh;
2232 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2233 if(!mesh || !node) {
2234 meshlink_errno = MESHLINK_EINVAL;
2238 node_t *n = (node_t *)node;
2241 pthread_mutex_lock(&mesh->mutex);
2242 reachable = n->status.reachable && !n->status.blacklisted;
2244 if(last_reachable) {
2245 *last_reachable = n->last_reachable;
2248 if(last_unreachable) {
2249 *last_unreachable = n->last_unreachable;
2252 pthread_mutex_unlock(&mesh->mutex);
2257 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2258 if(!mesh || !data || !len || !signature || !siglen) {
2259 meshlink_errno = MESHLINK_EINVAL;
2263 if(*siglen < MESHLINK_SIGLEN) {
2264 meshlink_errno = MESHLINK_EINVAL;
2268 pthread_mutex_lock(&mesh->mutex);
2270 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2271 meshlink_errno = MESHLINK_EINTERNAL;
2272 pthread_mutex_unlock(&mesh->mutex);
2276 *siglen = MESHLINK_SIGLEN;
2277 pthread_mutex_unlock(&mesh->mutex);
2281 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2282 if(!mesh || !data || !len || !signature) {
2283 meshlink_errno = MESHLINK_EINVAL;
2287 if(siglen != MESHLINK_SIGLEN) {
2288 meshlink_errno = MESHLINK_EINVAL;
2292 pthread_mutex_lock(&mesh->mutex);
2296 struct node_t *n = (struct node_t *)source;
2298 if(!node_read_public_key(mesh, n)) {
2299 meshlink_errno = MESHLINK_EINTERNAL;
2302 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2305 pthread_mutex_unlock(&mesh->mutex);
2309 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2310 pthread_mutex_lock(&mesh->mutex);
2312 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2315 // TODO: Update invitation key if necessary?
2318 pthread_mutex_unlock(&mesh->mutex);
2320 return mesh->invitation_key;
2323 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2324 if(!mesh || !node || !address) {
2325 meshlink_errno = MESHLINK_EINVAL;
2329 if(!is_valid_hostname(address)) {
2330 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2331 meshlink_errno = MESHLINK_EINVAL;
2335 if(port && !is_valid_port(port)) {
2336 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2337 meshlink_errno = MESHLINK_EINVAL;
2341 char *canonical_address;
2344 xasprintf(&canonical_address, "%s %s", address, port);
2346 canonical_address = xstrdup(address);
2349 pthread_mutex_lock(&mesh->mutex);
2351 node_t *n = (node_t *)node;
2352 free(n->canonical_address);
2353 n->canonical_address = canonical_address;
2355 if(!node_write_config(mesh, n)) {
2356 pthread_mutex_unlock(&mesh->mutex);
2360 pthread_mutex_unlock(&mesh->mutex);
2362 return config_sync(mesh, "current");
2365 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2366 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2369 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2371 meshlink_errno = MESHLINK_EINVAL;
2375 char *address = meshlink_get_external_address(mesh);
2381 bool rval = meshlink_add_address(mesh, address);
2387 int meshlink_get_port(meshlink_handle_t *mesh) {
2389 meshlink_errno = MESHLINK_EINVAL;
2394 meshlink_errno = MESHLINK_EINTERNAL;
2400 pthread_mutex_lock(&mesh->mutex);
2401 port = atoi(mesh->myport);
2402 pthread_mutex_unlock(&mesh->mutex);
2407 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2408 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2409 meshlink_errno = MESHLINK_EINVAL;
2413 if(mesh->myport && port == atoi(mesh->myport)) {
2417 if(!try_bind(port)) {
2418 meshlink_errno = MESHLINK_ENETWORK;
2422 devtool_trybind_probe();
2426 pthread_mutex_lock(&mesh->mutex);
2428 if(mesh->threadstarted) {
2429 meshlink_errno = MESHLINK_EINVAL;
2434 xasprintf(&mesh->myport, "%d", port);
2436 /* Close down the network. This also deletes mesh->self. */
2437 close_network_connections(mesh);
2439 /* Recreate mesh->self. */
2440 mesh->self = new_node();
2441 mesh->self->name = xstrdup(mesh->name);
2442 mesh->self->devclass = mesh->devclass;
2443 mesh->self->session_id = mesh->session_id;
2444 xasprintf(&mesh->myport, "%d", port);
2446 if(!node_read_public_key(mesh, mesh->self)) {
2447 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2448 meshlink_errno = MESHLINK_ESTORAGE;
2449 free_node(mesh->self);
2452 } else if(!setup_network(mesh)) {
2453 meshlink_errno = MESHLINK_ENETWORK;
2457 /* Rebuild our own list of recent addresses */
2458 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2459 add_local_addresses(mesh);
2461 /* Write meshlink.conf with the updated port number */
2462 write_main_config_files(mesh);
2464 rval = config_sync(mesh, "current");
2467 pthread_mutex_unlock(&mesh->mutex);
2469 return rval && meshlink_get_port(mesh) == port;
2472 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2473 mesh->invitation_timeout = timeout;
2476 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2477 meshlink_submesh_t *s = NULL;
2480 meshlink_errno = MESHLINK_EINVAL;
2485 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2488 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2489 meshlink_errno = MESHLINK_EINVAL;
2493 s = (meshlink_submesh_t *)mesh->self->submesh;
2496 pthread_mutex_lock(&mesh->mutex);
2498 // Check validity of the new node's name
2499 if(!check_id(name)) {
2500 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2501 meshlink_errno = MESHLINK_EINVAL;
2502 pthread_mutex_unlock(&mesh->mutex);
2506 // Ensure no host configuration file with that name exists
2507 if(config_exists(mesh, "current", name)) {
2508 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2509 meshlink_errno = MESHLINK_EEXIST;
2510 pthread_mutex_unlock(&mesh->mutex);
2514 // Ensure no other nodes know about this name
2515 if(lookup_node(mesh, name)) {
2516 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2517 meshlink_errno = MESHLINK_EEXIST;
2518 pthread_mutex_unlock(&mesh->mutex);
2522 // Get the local address
2523 char *address = get_my_hostname(mesh, flags);
2526 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2527 meshlink_errno = MESHLINK_ERESOLV;
2528 pthread_mutex_unlock(&mesh->mutex);
2532 if(!refresh_invitation_key(mesh)) {
2533 meshlink_errno = MESHLINK_EINTERNAL;
2534 pthread_mutex_unlock(&mesh->mutex);
2538 // If we changed our own host config file, write it out now
2539 if(mesh->self->status.dirty) {
2540 if(!node_write_config(mesh, mesh->self)) {
2541 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2542 pthread_mutex_unlock(&mesh->mutex);
2549 // Create a hash of the key.
2550 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2551 sha512(fingerprint, strlen(fingerprint), hash);
2552 b64encode_urlsafe(hash, hash, 18);
2554 // Create a random cookie for this invitation.
2556 randomize(cookie, 18);
2558 // Create a filename that doesn't reveal the cookie itself
2559 char buf[18 + strlen(fingerprint)];
2560 char cookiehash[64];
2561 memcpy(buf, cookie, 18);
2562 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2563 sha512(buf, sizeof(buf), cookiehash);
2564 b64encode_urlsafe(cookiehash, cookiehash, 18);
2566 b64encode_urlsafe(cookie, cookie, 18);
2570 /* Construct the invitation file */
2571 uint8_t outbuf[4096];
2572 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2574 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2575 packmsg_add_str(&inv, name);
2576 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2577 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2579 /* TODO: Add several host config files to bootstrap connections.
2580 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2581 * and are not blacklisted.
2583 config_t configs[5];
2584 memset(configs, 0, sizeof(configs));
2587 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2591 /* Append host config files to the invitation file */
2592 packmsg_add_array(&inv, count);
2594 for(int i = 0; i < count; i++) {
2595 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2596 config_free(&configs[i]);
2599 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2601 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2602 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2603 meshlink_errno = MESHLINK_ESTORAGE;
2604 pthread_mutex_unlock(&mesh->mutex);
2608 // Create an URL from the local address, key hash and cookie
2610 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2613 pthread_mutex_unlock(&mesh->mutex);
2617 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2618 return meshlink_invite_ex(mesh, submesh, name, 0);
2621 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2622 if(!mesh || !invitation) {
2623 meshlink_errno = MESHLINK_EINVAL;
2627 join_state_t state = {
2632 ecdsa_t *key = NULL;
2633 ecdsa_t *hiskey = NULL;
2635 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2636 char copy[strlen(invitation) + 1];
2638 pthread_mutex_lock(&mesh->mutex);
2640 //Before doing meshlink_join make sure we are not connected to another mesh
2641 if(mesh->threadstarted) {
2642 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2643 meshlink_errno = MESHLINK_EINVAL;
2647 // 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.
2648 if(mesh->nodes->count > 1) {
2649 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2650 meshlink_errno = MESHLINK_EINVAL;
2654 strcpy(copy, invitation);
2656 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2658 char *slash = strchr(copy, '/');
2666 if(strlen(slash) != 48) {
2670 char *address = copy;
2673 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2677 if(mesh->inviter_commits_first) {
2678 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2681 // Generate a throw-away key for the invitation.
2682 key = ecdsa_generate();
2685 meshlink_errno = MESHLINK_EINTERNAL;
2689 char *b64key = ecdsa_get_base64_public_key(key);
2692 while(address && *address) {
2693 // We allow commas in the address part to support multiple addresses in one invitation URL.
2694 comma = strchr(address, ',');
2700 // Split of the port
2701 port = strrchr(address, ':');
2709 // IPv6 address are enclosed in brackets, per RFC 3986
2710 if(*address == '[') {
2712 char *bracket = strchr(address, ']');
2725 // Connect to the meshlink daemon mentioned in the URL.
2726 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2729 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2730 state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2732 if(state.sock == -1) {
2733 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2734 meshlink_errno = MESHLINK_ENETWORK;
2738 set_timeout(state.sock, 5000);
2740 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2741 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2742 meshlink_errno = MESHLINK_ENETWORK;
2743 closesocket(state.sock);
2751 meshlink_errno = MESHLINK_ERESOLV;
2754 if(state.sock != -1 || !comma) {
2761 if(state.sock == -1) {
2765 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2767 // Tell him we have an invitation, and give him our throw-away key.
2771 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2772 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2773 meshlink_errno = MESHLINK_ENETWORK;
2779 char hisname[4096] = "";
2780 int code, hismajor, hisminor = 0;
2782 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) {
2783 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2784 meshlink_errno = MESHLINK_ENETWORK;
2788 // Check if the hash of the key he gave us matches the hash in the URL.
2789 char *fingerprint = state.line + 2;
2792 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2793 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
2794 meshlink_errno = MESHLINK_EINTERNAL;
2798 if(memcmp(hishash, state.hash, 18)) {
2799 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
2800 meshlink_errno = MESHLINK_EPEER;
2804 hiskey = ecdsa_set_base64_public_key(fingerprint);
2807 meshlink_errno = MESHLINK_EINTERNAL;
2811 // Start an SPTPS session
2812 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2813 meshlink_errno = MESHLINK_EINTERNAL;
2817 // Feed rest of input buffer to SPTPS
2818 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2819 meshlink_errno = MESHLINK_EPEER;
2824 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2826 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2828 if(errno == EINTR) {
2832 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2833 meshlink_errno = MESHLINK_ENETWORK;
2837 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2838 meshlink_errno = MESHLINK_EPEER;
2843 if(!state.success) {
2844 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2845 meshlink_errno = MESHLINK_EPEER;
2849 sptps_stop(&state.sptps);
2852 closesocket(state.sock);
2854 pthread_mutex_unlock(&mesh->mutex);
2858 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2859 meshlink_errno = MESHLINK_EINVAL;
2861 sptps_stop(&state.sptps);
2865 if(state.sock != -1) {
2866 closesocket(state.sock);
2869 pthread_mutex_unlock(&mesh->mutex);
2873 char *meshlink_export(meshlink_handle_t *mesh) {
2875 meshlink_errno = MESHLINK_EINVAL;
2879 // Create a config file on the fly.
2882 packmsg_output_t out = {buf, sizeof(buf)};
2883 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2884 packmsg_add_str(&out, mesh->name);
2885 packmsg_add_str(&out, CORE_MESH);
2887 pthread_mutex_lock(&mesh->mutex);
2889 packmsg_add_int32(&out, mesh->self->devclass);
2890 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2891 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2892 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2896 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2897 if(mesh->self->recent[i].sa.sa_family) {
2904 packmsg_add_array(&out, count);
2906 for(uint32_t i = 0; i < count; i++) {
2907 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2910 packmsg_add_int64(&out, 0);
2911 packmsg_add_int64(&out, 0);
2913 pthread_mutex_unlock(&mesh->mutex);
2915 if(!packmsg_output_ok(&out)) {
2916 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2917 meshlink_errno = MESHLINK_EINTERNAL;
2921 // Prepare a base64-encoded packmsg array containing our config file
2923 uint32_t len = packmsg_output_size(&out, buf);
2924 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2925 uint8_t *buf2 = xmalloc(len2);
2926 packmsg_output_t out2 = {buf2, len2};
2927 packmsg_add_array(&out2, 1);
2928 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2930 if(!packmsg_output_ok(&out2)) {
2931 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2932 meshlink_errno = MESHLINK_EINTERNAL;
2937 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2939 return (char *)buf2;
2942 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2943 if(!mesh || !data) {
2944 meshlink_errno = MESHLINK_EINVAL;
2948 size_t datalen = strlen(data);
2949 uint8_t *buf = xmalloc(datalen);
2950 int buflen = b64decode(data, buf, datalen);
2953 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2954 meshlink_errno = MESHLINK_EPEER;
2958 packmsg_input_t in = {buf, buflen};
2959 uint32_t count = packmsg_get_array(&in);
2962 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2963 meshlink_errno = MESHLINK_EPEER;
2967 pthread_mutex_lock(&mesh->mutex);
2971 uint32_t len = packmsg_get_bin_raw(&in, &data);
2977 packmsg_input_t in2 = {data, len};
2978 uint32_t version = packmsg_get_uint32(&in2);
2979 char *name = packmsg_get_str_dup(&in2);
2981 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2983 packmsg_input_invalidate(&in);
2987 if(!check_id(name)) {
2992 node_t *n = lookup_node(mesh, name);
2995 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3003 config_t config = {data, len};
3005 if(!node_read_from_config(mesh, n, &config)) {
3007 packmsg_input_invalidate(&in);
3011 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3012 n->last_reachable = 0;
3013 n->last_unreachable = 0;
3015 if(!node_write_config(mesh, n)) {
3023 pthread_mutex_unlock(&mesh->mutex);
3027 if(!packmsg_done(&in)) {
3028 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3029 meshlink_errno = MESHLINK_EPEER;
3033 if(!config_sync(mesh, "current")) {
3040 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3041 if(n == mesh->self) {
3042 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3043 meshlink_errno = MESHLINK_EINVAL;
3047 if(n->status.blacklisted) {
3048 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3052 n->status.blacklisted = true;
3054 /* Immediately shut down any connections we have with the blacklisted node.
3055 * We can't call terminate_connection(), because we might be called from a callback function.
3057 for list_each(connection_t, c, mesh->connections) {
3059 shutdown(c->socket, SHUT_RDWR);
3063 utcp_abort_all_connections(n->utcp);
3069 n->status.udp_confirmed = false;
3071 if(n->status.reachable) {
3072 n->last_unreachable = mesh->loop.now.tv_sec;
3075 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3076 * manually call the status callback if necessary.
3078 if(n->status.reachable && mesh->node_status_cb) {
3079 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3082 return node_write_config(mesh, n) && config_sync(mesh, "current");
3085 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3086 if(!mesh || !node) {
3087 meshlink_errno = MESHLINK_EINVAL;
3091 pthread_mutex_lock(&mesh->mutex);
3093 if(!blacklist(mesh, (node_t *)node)) {
3094 pthread_mutex_unlock(&mesh->mutex);
3098 pthread_mutex_unlock(&mesh->mutex);
3100 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3104 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3105 if(!mesh || !name) {
3106 meshlink_errno = MESHLINK_EINVAL;
3110 pthread_mutex_lock(&mesh->mutex);
3112 node_t *n = lookup_node(mesh, (char *)name);
3116 n->name = xstrdup(name);
3120 if(!blacklist(mesh, (node_t *)n)) {
3121 pthread_mutex_unlock(&mesh->mutex);
3125 pthread_mutex_unlock(&mesh->mutex);
3127 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3131 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3132 if(n == mesh->self) {
3133 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3134 meshlink_errno = MESHLINK_EINVAL;
3138 if(!n->status.blacklisted) {
3139 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3143 n->status.blacklisted = false;
3145 if(n->status.reachable) {
3146 n->last_reachable = mesh->loop.now.tv_sec;
3147 update_node_status(mesh, n);
3150 return node_write_config(mesh, n) && config_sync(mesh, "current");
3153 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3154 if(!mesh || !node) {
3155 meshlink_errno = MESHLINK_EINVAL;
3159 pthread_mutex_lock(&mesh->mutex);
3161 if(!whitelist(mesh, (node_t *)node)) {
3162 pthread_mutex_unlock(&mesh->mutex);
3166 pthread_mutex_unlock(&mesh->mutex);
3168 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3172 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3173 if(!mesh || !name) {
3174 meshlink_errno = MESHLINK_EINVAL;
3178 pthread_mutex_lock(&mesh->mutex);
3180 node_t *n = lookup_node(mesh, (char *)name);
3184 n->name = xstrdup(name);
3188 if(!whitelist(mesh, (node_t *)n)) {
3189 pthread_mutex_unlock(&mesh->mutex);
3193 pthread_mutex_unlock(&mesh->mutex);
3195 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3199 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3200 mesh->default_blacklist = blacklist;
3203 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3204 if(!mesh || !node) {
3205 meshlink_errno = MESHLINK_EINVAL;
3209 node_t *n = (node_t *)node;
3211 pthread_mutex_lock(&mesh->mutex);
3213 /* Check that the node is not reachable */
3214 if(n->status.reachable || n->connection) {
3215 pthread_mutex_unlock(&mesh->mutex);
3216 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3220 /* Check that we don't have any active UTCP connections */
3221 if(n->utcp && utcp_is_active(n->utcp)) {
3222 pthread_mutex_unlock(&mesh->mutex);
3223 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3227 /* Check that we have no active connections to this node */
3228 for list_each(connection_t, c, mesh->connections) {
3230 pthread_mutex_unlock(&mesh->mutex);
3231 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3236 /* Remove any pending outgoings to this node */
3237 if(mesh->outgoings) {
3238 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3239 if(outgoing->node == n) {
3240 list_delete_node(mesh->outgoings, node);
3245 /* Delete the config file for this node */
3246 if(!config_delete(mesh, "current", n->name)) {
3247 pthread_mutex_unlock(&mesh->mutex);
3251 /* Delete the node struct and any remaining edges referencing this node */
3254 pthread_mutex_unlock(&mesh->mutex);
3256 return config_sync(mesh, "current");
3259 /* Hint that a hostname may be found at an address
3260 * See header file for detailed comment.
3262 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3263 if(!mesh || !node || !addr) {
3264 meshlink_errno = EINVAL;
3268 pthread_mutex_lock(&mesh->mutex);
3270 node_t *n = (node_t *)node;
3272 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3273 if(!node_write_config(mesh, n)) {
3274 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3278 pthread_mutex_unlock(&mesh->mutex);
3279 // @TODO do we want to fire off a connection attempt right away?
3282 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3284 node_t *n = utcp->priv;
3285 meshlink_handle_t *mesh = n->mesh;
3286 return mesh->channel_accept_cb;
3289 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
3291 if(aio->cb.buffer) {
3292 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
3296 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3301 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3302 meshlink_channel_t *channel = connection->priv;
3308 node_t *n = channel->node;
3309 meshlink_handle_t *mesh = n->mesh;
3311 if(n->status.destroyed) {
3312 meshlink_channel_close(mesh, channel);
3316 const char *p = data;
3319 while(channel->aio_receive) {
3320 meshlink_aio_buffer_t *aio = channel->aio_receive;
3321 size_t todo = aio->len - aio->done;
3328 memcpy((char *)aio->data + aio->done, p, todo);
3330 ssize_t result = write(aio->fd, p, todo);
3339 if(aio->done == aio->len) {
3340 channel->aio_receive = aio->next;
3341 aio_signal(mesh, channel, aio);
3353 if(channel->receive_cb) {
3354 channel->receive_cb(mesh, channel, p, left);
3360 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3361 node_t *n = utcp_connection->utcp->priv;
3367 meshlink_handle_t *mesh = n->mesh;
3369 if(!mesh->channel_accept_cb) {
3373 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3375 channel->c = utcp_connection;
3377 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3378 utcp_accept(utcp_connection, channel_recv, channel);
3384 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3385 node_t *n = utcp->priv;
3387 if(n->status.destroyed) {
3391 meshlink_handle_t *mesh = n->mesh;
3392 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3395 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3396 if(!mesh || !channel) {
3397 meshlink_errno = MESHLINK_EINVAL;
3401 channel->receive_cb = cb;
3404 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3406 node_t *n = (node_t *)source;
3412 utcp_recv(n->utcp, data, len);
3415 static void channel_poll(struct utcp_connection *connection, size_t len) {
3416 meshlink_channel_t *channel = connection->priv;
3422 node_t *n = channel->node;
3423 meshlink_handle_t *mesh = n->mesh;
3424 meshlink_aio_buffer_t *aio = channel->aio_send;
3427 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3428 size_t left = aio->len - aio->done;
3436 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3439 size_t todo = utcp_get_sndbuf_free(connection);
3445 if(todo > sizeof(buf)) {
3449 ssize_t result = read(aio->fd, buf, todo);
3452 sent = utcp_send(connection, buf, result);
3462 /* If the buffer is now completely sent, call the callback and dispose of it. */
3463 if(aio->done >= aio->len) {
3464 channel->aio_send = aio->next;
3465 aio_signal(mesh, channel, aio);
3469 if(channel->poll_cb) {
3470 channel->poll_cb(mesh, channel, len);
3472 utcp_set_poll_cb(connection, NULL);
3477 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3478 if(!mesh || !channel) {
3479 meshlink_errno = MESHLINK_EINVAL;
3483 pthread_mutex_lock(&mesh->mutex);
3484 channel->poll_cb = cb;
3485 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3486 pthread_mutex_unlock(&mesh->mutex);
3489 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3491 meshlink_errno = MESHLINK_EINVAL;
3495 pthread_mutex_lock(&mesh->mutex);
3496 mesh->channel_accept_cb = cb;
3497 mesh->receive_cb = channel_receive;
3499 for splay_each(node_t, n, mesh->nodes) {
3500 if(!n->utcp && n != mesh->self) {
3501 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3505 pthread_mutex_unlock(&mesh->mutex);
3508 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3512 meshlink_errno = MESHLINK_EINVAL;
3516 pthread_mutex_lock(&mesh->mutex);
3517 utcp_set_sndbuf(channel->c, size);
3518 pthread_mutex_unlock(&mesh->mutex);
3521 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3525 meshlink_errno = MESHLINK_EINVAL;
3529 pthread_mutex_lock(&mesh->mutex);
3530 utcp_set_rcvbuf(channel->c, size);
3531 pthread_mutex_unlock(&mesh->mutex);
3534 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) {
3536 abort(); // TODO: handle non-NULL data
3539 if(!mesh || !node) {
3540 meshlink_errno = MESHLINK_EINVAL;
3544 pthread_mutex_lock(&mesh->mutex);
3546 node_t *n = (node_t *)node;
3549 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3550 mesh->receive_cb = channel_receive;
3553 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3554 pthread_mutex_unlock(&mesh->mutex);
3559 if(n->status.blacklisted) {
3560 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3561 meshlink_errno = MESHLINK_EBLACKLISTED;
3562 pthread_mutex_unlock(&mesh->mutex);
3566 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3568 channel->receive_cb = cb;
3571 channel->priv = (void *)data;
3574 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3576 pthread_mutex_unlock(&mesh->mutex);
3579 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3587 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) {
3588 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3591 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3592 if(!mesh || !channel) {
3593 meshlink_errno = MESHLINK_EINVAL;
3597 pthread_mutex_lock(&mesh->mutex);
3598 utcp_shutdown(channel->c, direction);
3599 pthread_mutex_unlock(&mesh->mutex);
3602 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3603 if(!mesh || !channel) {
3604 meshlink_errno = MESHLINK_EINVAL;
3608 pthread_mutex_lock(&mesh->mutex);
3610 utcp_close(channel->c);
3612 /* Clean up any outstanding AIO buffers. */
3613 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3615 aio_signal(mesh, channel, aio);
3619 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3621 aio_signal(mesh, channel, aio);
3625 pthread_mutex_unlock(&mesh->mutex);
3630 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3631 if(!mesh || !channel) {
3632 meshlink_errno = MESHLINK_EINVAL;
3641 meshlink_errno = MESHLINK_EINVAL;
3645 // TODO: more finegrained locking.
3646 // Ideally we want to put the data into the UTCP connection's send buffer.
3647 // Then, preferably only if there is room in the receiver window,
3648 // kick the meshlink thread to go send packets.
3652 pthread_mutex_lock(&mesh->mutex);
3654 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3655 if(channel->aio_send) {
3658 retval = utcp_send(channel->c, data, len);
3661 pthread_mutex_unlock(&mesh->mutex);
3664 meshlink_errno = MESHLINK_ENETWORK;
3670 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) {
3671 if(!mesh || !channel) {
3672 meshlink_errno = MESHLINK_EINVAL;
3677 meshlink_errno = MESHLINK_EINVAL;
3681 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3684 aio->cb.buffer = cb;
3687 pthread_mutex_lock(&mesh->mutex);
3689 /* Append the AIO buffer descriptor to the end of the chain */
3690 meshlink_aio_buffer_t **p = &channel->aio_send;
3698 /* Ensure the poll callback is set, and call it right now to push data if possible */
3699 utcp_set_poll_cb(channel->c, channel_poll);
3700 channel_poll(channel->c, len);
3702 pthread_mutex_unlock(&mesh->mutex);
3707 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) {
3708 if(!mesh || !channel) {
3709 meshlink_errno = MESHLINK_EINVAL;
3713 if(!len || fd == -1) {
3714 meshlink_errno = MESHLINK_EINVAL;
3718 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3724 pthread_mutex_lock(&mesh->mutex);
3726 /* Append the AIO buffer descriptor to the end of the chain */
3727 meshlink_aio_buffer_t **p = &channel->aio_send;
3735 /* Ensure the poll callback is set, and call it right now to push data if possible */
3736 utcp_set_poll_cb(channel->c, channel_poll);
3737 channel_poll(channel->c, len);
3739 pthread_mutex_unlock(&mesh->mutex);
3744 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) {
3745 if(!mesh || !channel) {
3746 meshlink_errno = MESHLINK_EINVAL;
3751 meshlink_errno = MESHLINK_EINVAL;
3755 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3758 aio->cb.buffer = cb;
3761 pthread_mutex_lock(&mesh->mutex);
3763 /* Append the AIO buffer descriptor to the end of the chain */
3764 meshlink_aio_buffer_t **p = &channel->aio_receive;
3772 pthread_mutex_unlock(&mesh->mutex);
3777 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) {
3778 if(!mesh || !channel) {
3779 meshlink_errno = MESHLINK_EINVAL;
3783 if(!len || fd == -1) {
3784 meshlink_errno = MESHLINK_EINVAL;
3788 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3794 pthread_mutex_lock(&mesh->mutex);
3796 /* Append the AIO buffer descriptor to the end of the chain */
3797 meshlink_aio_buffer_t **p = &channel->aio_receive;
3805 pthread_mutex_unlock(&mesh->mutex);
3810 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3811 if(!mesh || !channel) {
3812 meshlink_errno = MESHLINK_EINVAL;
3816 return channel->c->flags;
3819 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3820 if(!mesh || !channel) {
3821 meshlink_errno = MESHLINK_EINVAL;
3825 return utcp_get_sendq(channel->c);
3828 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3829 if(!mesh || !channel) {
3830 meshlink_errno = MESHLINK_EINVAL;
3834 return utcp_get_recvq(channel->c);
3837 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3838 if(!mesh || !node) {
3839 meshlink_errno = MESHLINK_EINVAL;
3843 node_t *n = (node_t *)node;
3845 pthread_mutex_lock(&mesh->mutex);
3848 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3851 utcp_set_user_timeout(n->utcp, timeout);
3853 pthread_mutex_unlock(&mesh->mutex);
3856 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3857 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3858 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3861 if(mesh->node_status_cb) {
3862 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3865 if(mesh->node_pmtu_cb) {
3866 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3870 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3871 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3872 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3876 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3877 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3881 n->status.duplicate = true;
3882 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3885 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3889 meshlink_errno = MESHLINK_EINVAL;
3893 pthread_mutex_lock(&mesh->mutex);
3895 if(mesh->discovery == enable) {
3899 if(mesh->threadstarted) {
3901 discovery_start(mesh);
3903 discovery_stop(mesh);
3907 mesh->discovery = enable;
3910 pthread_mutex_unlock(&mesh->mutex);
3914 meshlink_errno = MESHLINK_ENOTSUP;
3918 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3919 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3920 meshlink_errno = EINVAL;
3924 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3925 meshlink_errno = EINVAL;
3929 pthread_mutex_lock(&mesh->mutex);
3930 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3931 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3932 pthread_mutex_unlock(&mesh->mutex);
3935 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3936 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3937 meshlink_errno = EINVAL;
3941 if(fast_retry_period < 0) {
3942 meshlink_errno = EINVAL;
3946 pthread_mutex_lock(&mesh->mutex);
3947 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
3948 pthread_mutex_unlock(&mesh->mutex);
3951 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
3953 meshlink_errno = EINVAL;
3957 pthread_mutex_lock(&mesh->mutex);
3958 mesh->inviter_commits_first = inviter_commits_first;
3959 pthread_mutex_unlock(&mesh->mutex);
3962 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3965 if(!mesh->connections || !mesh->loop.running) {
3972 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
3973 // We should only call the callback function if we are in the background thread.
3974 if(!mesh->error_cb) {
3978 if(!mesh->threadstarted) {
3982 if(mesh->thread == pthread_self()) {
3983 mesh->error_cb(mesh, meshlink_errno);
3987 static void __attribute__((constructor)) meshlink_init(void) {
3991 static void __attribute__((destructor)) meshlink_exit(void) {