2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2021 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include "meshlink_internal.h"
39 #include "ed25519/sha512.h"
40 #include "discovery.h"
45 #define MSG_NOSIGNAL 0
47 __thread meshlink_errno_t meshlink_errno;
48 meshlink_log_cb_t global_log_cb;
49 meshlink_log_level_t global_log_level;
51 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
53 static int rstrip(char *value) {
54 int len = strlen(value);
56 while(len && strchr("\t\r\n ", value[len - 1])) {
63 static void get_canonical_address(node_t *n, char **hostname, char **port) {
64 if(!n->canonical_address) {
68 *hostname = xstrdup(n->canonical_address);
69 char *space = strchr(*hostname, ' ');
73 *port = xstrdup(space);
77 static bool is_valid_hostname(const char *hostname) {
82 for(const char *p = hostname; *p; p++) {
83 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
91 static bool is_valid_port(const char *port) {
98 unsigned long int result = strtoul(port, &end, 10);
99 return result && result < 65536 && !*end;
102 for(const char *p = port; *p; p++) {
103 if(!(isalnum(*p) || *p == '-')) {
111 static void set_timeout(int sock, int timeout) {
116 tv.tv_sec = timeout / 1000;
117 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
119 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
120 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
123 struct socket_in_netns_params {
132 static void *socket_in_netns_thread(void *arg) {
133 struct socket_in_netns_params *params = arg;
135 if(setns(params->netns, CLONE_NEWNET) == -1) {
136 meshlink_errno = MESHLINK_EINVAL;
140 params->fd = socket(params->domain, params->type, params->protocol);
146 static int socket_in_netns(int domain, int type, int protocol, int netns) {
148 return socket(domain, type, protocol);
152 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
156 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
157 if(pthread_join(thr, NULL) != 0) {
169 // Find out what local address a socket would use if we connect to the given address.
170 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
171 // of both endpoints, but this will actually not send any UDP packet.
172 static bool getlocaladdr(const char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
173 struct addrinfo *rai = NULL;
174 const struct addrinfo hint = {
175 .ai_family = AF_UNSPEC,
176 .ai_socktype = SOCK_DGRAM,
177 .ai_protocol = IPPROTO_UDP,
178 .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
181 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
185 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
192 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
200 if(getsockname(sock, &sa->sa, salen)) {
209 static bool getlocaladdrname(const char *destaddr, char *host, socklen_t hostlen, int netns) {
211 socklen_t salen = sizeof(sa);
213 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
217 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
224 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
225 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
228 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
229 logger(mesh, MESHLINK_DEBUG, "meshlink_get_external_address_for_family(%d)", family);
230 const char *url = mesh->external_address_url;
233 url = "http://meshlink.io/host.cgi";
236 /* Find the hostname part between the slashes */
237 if(strncmp(url, "http://", 7)) {
239 meshlink_errno = MESHLINK_EINTERNAL;
243 const char *begin = url + 7;
245 const char *end = strchr(begin, '/');
248 end = begin + strlen(begin);
252 char host[end - begin + 1];
253 strncpy(host, begin, end - begin);
254 host[end - begin] = 0;
256 char *port = strchr(host, ':');
262 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
263 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), SOCK_STREAM, 5);
265 char *hostname = NULL;
267 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
268 if(family != AF_UNSPEC && aip->ai_family != family) {
272 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
276 setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
280 set_timeout(s, 5000);
282 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
289 send(s, "GET ", 4, 0);
290 send(s, url, strlen(url), 0);
291 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
292 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
297 if(line[len - 1] == '\n') {
301 char *p = strrchr(line, '\n');
304 hostname = xstrdup(p + 1);
320 // Check that the hostname is reasonable
321 if(hostname && !is_valid_hostname(hostname)) {
327 meshlink_errno = MESHLINK_ERESOLV;
333 static bool is_localaddr(sockaddr_t *sa) {
334 switch(sa->sa.sa_family) {
336 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
339 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
340 return first == 0 || (first & 0xffc0) == 0xfe80;
348 #ifdef HAVE_GETIFADDRS
349 struct getifaddrs_in_netns_params {
350 struct ifaddrs **ifa;
355 static void *getifaddrs_in_netns_thread(void *arg) {
356 struct getifaddrs_in_netns_params *params = arg;
358 if(setns(params->netns, CLONE_NEWNET) == -1) {
359 meshlink_errno = MESHLINK_EINVAL;
363 if(getifaddrs(params->ifa) != 0) {
371 static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) {
373 return getifaddrs(ifa);
377 struct getifaddrs_in_netns_params params = {ifa, netns};
380 if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) {
381 if(pthread_join(thr, NULL) != 0) {
386 return *params.ifa ? 0 : -1;
394 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
395 logger(mesh, MESHLINK_DEBUG, "meshlink_get_local_address_for_family(%d)", family);
398 meshlink_errno = MESHLINK_EINVAL;
402 // Determine address of the local interface used for outgoing connections.
403 char localaddr[NI_MAXHOST];
404 bool success = false;
406 if(family == AF_INET) {
407 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
408 } else if(family == AF_INET6) {
409 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
412 #ifdef HAVE_GETIFADDRS
415 struct ifaddrs *ifa = NULL;
416 getifaddrs_in_netns(&ifa, mesh->netns);
418 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
419 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
421 if(!sa || sa->sa.sa_family != family) {
425 if(is_localaddr(sa)) {
429 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
441 meshlink_errno = MESHLINK_ENETWORK;
445 return xstrdup(localaddr);
448 static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
449 for(int i = 0; i < n; i++) {
454 // Ignore duplicate hostnames
457 for(int j = 0; j < i; j++) {
462 if(strcmp(host[i], host[j])) {
466 if(strcmp(port[i], port[j])) {
474 if(found || !is_valid_hostname(host[i])) {
484 // This gets the hostname part for use in invitation URLs
485 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
486 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
488 char *hostname[count];
490 char *hostport = NULL;
492 memset(hostname, 0, sizeof(hostname));
493 memset(port, 0, sizeof(port));
495 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
496 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
499 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
500 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
503 // Add all explicitly set invitation addresses
504 if(mesh->invitation_addresses) {
505 for list_each(char, combo, mesh->invitation_addresses) {
506 hostname[n] = xstrdup(combo);
507 char *slash = strrchr(hostname[n], '/');
511 port[n] = xstrdup(slash + 1);
518 // Add local addresses if requested
519 if(flags & MESHLINK_INVITE_LOCAL) {
520 if(flags & MESHLINK_INVITE_IPV4) {
521 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
524 if(flags & MESHLINK_INVITE_IPV6) {
525 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
529 // Add public/canonical addresses if requested
530 if(flags & MESHLINK_INVITE_PUBLIC) {
531 // Try the CanonicalAddress first
532 get_canonical_address(mesh->self, &hostname[n], &port[n]);
534 if(!hostname[n] && count == 4) {
535 if(flags & MESHLINK_INVITE_IPV4) {
536 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
539 if(flags & MESHLINK_INVITE_IPV6) {
540 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
547 for(int i = 0; i < n; i++) {
548 // Ensure we always have a port number
549 if(hostname[i] && !port[i]) {
550 port[i] = xstrdup(mesh->myport);
554 remove_duplicate_hostnames(hostname, port, n);
556 // Resolve the hostnames
557 for(int i = 0; i < n; i++) {
562 // Convert what we have to a sockaddr
563 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5);
569 // Remember the address(es)
570 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
571 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
578 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
579 remove_duplicate_hostnames(hostname, port, n);
581 // Concatenate all unique address to the hostport string
582 for(int i = 0; i < n; i++) {
587 // Append the address to the hostport string
589 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
591 hostport = newhostport;
600 static bool try_bind(meshlink_handle_t *mesh, int port) {
601 struct addrinfo *ai = NULL;
602 struct addrinfo hint = {
603 .ai_flags = AI_PASSIVE,
604 .ai_family = AF_UNSPEC,
605 .ai_socktype = SOCK_STREAM,
606 .ai_protocol = IPPROTO_TCP,
610 snprintf(portstr, sizeof(portstr), "%d", port);
612 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
616 bool success = false;
618 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
619 /* Try to bind to TCP. */
621 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
624 if(errno == EADDRINUSE) {
625 /* If this port is in use for any address family, avoid it. */
633 /* If TCP worked, then we require that UDP works as well. */
635 int udp_fd = setup_udp_listen_socket(mesh, aip);
652 int check_port(meshlink_handle_t *mesh) {
653 for(int i = 0; i < 1000; i++) {
654 int port = 0x1000 + prng(mesh, 0x8000);
656 if(try_bind(mesh, port)) {
658 xasprintf(&mesh->myport, "%d", port);
663 meshlink_errno = MESHLINK_ENETWORK;
664 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
668 static bool write_main_config_files(meshlink_handle_t *mesh) {
669 if(!mesh->confbase) {
675 /* Write the main config file */
676 packmsg_output_t out = {buf, sizeof buf};
678 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
679 packmsg_add_str(&out, mesh->name);
680 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
681 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
682 packmsg_add_uint16(&out, atoi(mesh->myport));
684 if(!packmsg_output_ok(&out)) {
688 config_t config = {buf, packmsg_output_size(&out, buf)};
690 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
694 /* Write our own host config file */
695 if(!node_write_config(mesh, mesh->self, true)) {
703 meshlink_handle_t *mesh;
705 char cookie[18 + 32];
716 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
717 meshlink_handle_t *mesh = state->mesh;
718 packmsg_input_t in = {buf, len};
719 uint32_t version = packmsg_get_uint32(&in);
721 if(version != MESHLINK_INVITATION_VERSION) {
722 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
726 char *name = packmsg_get_str_dup(&in);
727 char *submesh_name = packmsg_get_str_dup(&in);
728 dev_class_t devclass = packmsg_get_int32(&in);
729 uint32_t count = packmsg_get_array(&in);
731 if(!name || !check_id(name)) {
732 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
738 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
739 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
746 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
753 free(mesh->self->name);
755 mesh->self->name = xstrdup(name);
756 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
758 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
760 // Initialize configuration directory
761 if(!config_init(mesh, "current")) {
765 if(!write_main_config_files(mesh)) {
769 // Write host config files
770 for(uint32_t i = 0; i < count; i++) {
772 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
775 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
779 packmsg_input_t in2 = {data, data_len};
780 uint32_t version2 = packmsg_get_uint32(&in2);
781 char *name2 = packmsg_get_str_dup(&in2);
783 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
785 packmsg_input_invalidate(&in);
789 if(!check_id(name2)) {
794 if(!strcmp(name2, mesh->name)) {
795 logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n");
797 meshlink_errno = MESHLINK_EPEER;
801 node_t *n = new_node();
804 config_t config = {data, data_len};
806 if(!node_read_from_config(mesh, n, &config)) {
808 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
809 meshlink_errno = MESHLINK_EPEER;
814 /* The first host config file is of the inviter itself;
815 * remember the address we are currently using for the invitation connection.
818 socklen_t salen = sizeof(sa);
820 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
821 node_add_recent_address(mesh, n, &sa);
825 /* Clear the reachability times, since we ourself have never seen these nodes yet */
826 n->last_reachable = 0;
827 n->last_unreachable = 0;
829 if(!node_write_config(mesh, n, true)) {
837 /* Ensure the configuration directory metadata is on disk */
838 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
842 if(!mesh->inviter_commits_first) {
843 devtool_set_inviter_commits_first(false);
846 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
848 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
853 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
855 join_state_t *state = handle;
856 const char *ptr = data;
859 int result = send(state->sock, ptr, len, 0);
861 if(result == -1 && errno == EINTR) {
863 } else if(result <= 0) {
874 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
875 join_state_t *state = handle;
876 meshlink_handle_t *mesh = state->mesh;
878 if(mesh->inviter_commits_first) {
880 case SPTPS_HANDSHAKE:
881 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
887 if(!finalize_join(state, msg, len)) {
891 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
892 shutdown(state->sock, SHUT_RDWR);
893 state->success = true;
901 case SPTPS_HANDSHAKE:
902 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
905 return finalize_join(state, msg, len);
908 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
909 shutdown(state->sock, SHUT_RDWR);
910 state->success = true;
921 static bool recvline(join_state_t *state) {
922 char *newline = NULL;
924 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
925 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
927 if(result == -1 && errno == EINTR) {
929 } else if(result <= 0) {
933 state->blen += result;
936 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
940 size_t len = newline - state->buffer;
942 memcpy(state->line, state->buffer, len);
943 state->line[len] = 0;
944 memmove(state->buffer, newline + 1, state->blen - len - 1);
945 state->blen -= len + 1;
950 static bool sendline(int fd, const char *format, ...) {
956 va_start(ap, format);
957 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
960 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
968 int result = send(fd, p, blen, MSG_NOSIGNAL);
970 if(result == -1 && errno == EINTR) {
972 } else if(result <= 0) {
983 static const char *errstr[] = {
984 [MESHLINK_OK] = "No error",
985 [MESHLINK_EINVAL] = "Invalid argument",
986 [MESHLINK_ENOMEM] = "Out of memory",
987 [MESHLINK_ENOENT] = "No such node",
988 [MESHLINK_EEXIST] = "Node already exists",
989 [MESHLINK_EINTERNAL] = "Internal error",
990 [MESHLINK_ERESOLV] = "Could not resolve hostname",
991 [MESHLINK_ESTORAGE] = "Storage error",
992 [MESHLINK_ENETWORK] = "Network error",
993 [MESHLINK_EPEER] = "Error communicating with peer",
994 [MESHLINK_ENOTSUP] = "Operation not supported",
995 [MESHLINK_EBUSY] = "MeshLink instance already in use",
996 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
999 const char *meshlink_strerror(meshlink_errno_t err) {
1000 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
1001 return "Invalid error code";
1007 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
1008 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
1010 mesh->private_key = ecdsa_generate();
1011 mesh->invitation_key = ecdsa_generate();
1013 if(!mesh->private_key || !mesh->invitation_key) {
1014 logger(mesh, MESHLINK_ERROR, "Error during key generation!\n");
1015 meshlink_errno = MESHLINK_EINTERNAL;
1019 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1024 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
1025 if(a->tv_sec == b->tv_sec) {
1026 return a->tv_nsec < b->tv_nsec;
1028 return a->tv_sec < b->tv_sec;
1032 static struct timespec idle(event_loop_t *loop, void *data) {
1034 meshlink_handle_t *mesh = data;
1035 struct timespec t, tmin = {3600, 0};
1037 for splay_each(node_t, n, mesh->nodes) {
1042 t = utcp_timeout(n->utcp);
1044 if(timespec_lt(&t, &tmin)) {
1052 // Get our local address(es) by simulating connecting to an Internet host.
1053 static void add_local_addresses(meshlink_handle_t *mesh) {
1055 sa.storage.ss_family = AF_UNKNOWN;
1056 socklen_t salen = sizeof(sa);
1060 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1061 sa.in.sin_port = ntohs(atoi(mesh->myport));
1062 node_add_recent_address(mesh, mesh->self, &sa);
1069 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1070 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1071 node_add_recent_address(mesh, mesh->self, &sa);
1075 static bool meshlink_setup(meshlink_handle_t *mesh) {
1076 if(!config_destroy(mesh->confbase, "new")) {
1077 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1078 meshlink_errno = MESHLINK_ESTORAGE;
1082 if(!config_destroy(mesh->confbase, "old")) {
1083 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1084 meshlink_errno = MESHLINK_ESTORAGE;
1088 if(!config_init(mesh, "current")) {
1089 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1090 meshlink_errno = MESHLINK_ESTORAGE;
1094 if(!ecdsa_keygen(mesh)) {
1095 meshlink_errno = MESHLINK_EINTERNAL;
1099 if(check_port(mesh) == 0) {
1100 meshlink_errno = MESHLINK_ENETWORK;
1104 /* Create a node for ourself */
1106 mesh->self = new_node();
1107 mesh->self->name = xstrdup(mesh->name);
1108 mesh->self->devclass = mesh->devclass;
1109 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1110 mesh->self->session_id = mesh->session_id;
1112 if(!write_main_config_files(mesh)) {
1113 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1114 meshlink_errno = MESHLINK_ESTORAGE;
1118 /* Ensure the configuration directory metadata is on disk */
1119 if(!config_sync(mesh, "current")) {
1126 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1129 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1130 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1134 packmsg_input_t in = {config.buf, config.len};
1135 const void *private_key;
1136 const void *invitation_key;
1138 uint32_t version = packmsg_get_uint32(&in);
1139 char *name = packmsg_get_str_dup(&in);
1140 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1141 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1142 uint16_t myport = packmsg_get_uint16(&in);
1144 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1145 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1147 config_free(&config);
1151 if(mesh->name && strcmp(mesh->name, name)) {
1152 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1153 meshlink_errno = MESHLINK_ESTORAGE;
1155 config_free(&config);
1161 xasprintf(&mesh->myport, "%u", myport);
1162 mesh->private_key = ecdsa_set_private_key(private_key);
1163 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1164 config_free(&config);
1166 /* Create a node for ourself and read our host configuration file */
1168 mesh->self = new_node();
1169 mesh->self->name = xstrdup(name);
1170 mesh->self->devclass = mesh->devclass;
1171 mesh->self->session_id = mesh->session_id;
1173 if(!node_read_public_key(mesh, mesh->self)) {
1174 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1175 meshlink_errno = MESHLINK_ESTORAGE;
1176 free_node(mesh->self);
1185 static void *setup_network_in_netns_thread(void *arg) {
1186 meshlink_handle_t *mesh = arg;
1188 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1192 bool success = setup_network(mesh);
1193 return success ? arg : NULL;
1195 #endif // HAVE_SETNS
1197 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1198 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass);
1200 if(!confbase || !*confbase) {
1201 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1202 meshlink_errno = MESHLINK_EINVAL;
1206 if(!appname || !*appname) {
1207 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1208 meshlink_errno = MESHLINK_EINVAL;
1212 if(strchr(appname, ' ')) {
1213 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1214 meshlink_errno = MESHLINK_EINVAL;
1218 if(name && !check_id(name)) {
1219 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1220 meshlink_errno = MESHLINK_EINVAL;
1224 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1225 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1226 meshlink_errno = MESHLINK_EINVAL;
1230 meshlink_open_params_t *params = xzalloc(sizeof * params);
1232 params->confbase = xstrdup(confbase);
1233 params->name = name ? xstrdup(name) : NULL;
1234 params->appname = xstrdup(appname);
1235 params->devclass = devclass;
1238 xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase);
1243 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1244 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns);
1247 meshlink_errno = MESHLINK_EINVAL;
1251 params->netns = netns;
1256 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1257 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen);
1260 meshlink_errno = MESHLINK_EINVAL;
1264 if((!key && keylen) || (key && !keylen)) {
1265 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1266 meshlink_errno = MESHLINK_EINVAL;
1271 params->keylen = keylen;
1276 bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) {
1277 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy);
1280 meshlink_errno = MESHLINK_EINVAL;
1284 params->storage_policy = policy;
1289 bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) {
1290 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename);
1292 if(!params || !filename) {
1293 meshlink_errno = MESHLINK_EINVAL;
1297 free(params->lock_filename);
1298 params->lock_filename = xstrdup(filename);
1303 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1304 logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen);
1306 if(!mesh || !new_key || !new_keylen) {
1307 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1308 meshlink_errno = MESHLINK_EINVAL;
1312 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1316 // Create hash for the new key
1317 void *new_config_key;
1318 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1320 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1321 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1322 meshlink_errno = MESHLINK_EINTERNAL;
1323 pthread_mutex_unlock(&mesh->mutex);
1327 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1329 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1330 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1331 meshlink_errno = MESHLINK_ESTORAGE;
1332 pthread_mutex_unlock(&mesh->mutex);
1336 devtool_keyrotate_probe(1);
1338 // Rename confbase/current/ to confbase/old
1340 if(!config_rename(mesh, "current", "old")) {
1341 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1342 meshlink_errno = MESHLINK_ESTORAGE;
1343 pthread_mutex_unlock(&mesh->mutex);
1347 devtool_keyrotate_probe(2);
1349 // Rename confbase/new/ to confbase/current
1351 if(!config_rename(mesh, "new", "current")) {
1352 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1353 meshlink_errno = MESHLINK_ESTORAGE;
1354 pthread_mutex_unlock(&mesh->mutex);
1358 devtool_keyrotate_probe(3);
1360 // Cleanup the "old" confbase sub-directory
1362 if(!config_destroy(mesh->confbase, "old")) {
1363 pthread_mutex_unlock(&mesh->mutex);
1367 // Change the mesh handle key with new key
1369 free(mesh->config_key);
1370 mesh->config_key = new_config_key;
1372 pthread_mutex_unlock(&mesh->mutex);
1377 void meshlink_open_params_free(meshlink_open_params_t *params) {
1378 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()");
1381 meshlink_errno = MESHLINK_EINVAL;
1385 free(params->confbase);
1387 free(params->appname);
1388 free(params->lock_filename);
1393 /// Device class traits
1394 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1395 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1396 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1397 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1398 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1401 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1402 logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass);
1404 if(!confbase || !*confbase) {
1405 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1406 meshlink_errno = MESHLINK_EINVAL;
1410 char lock_filename[PATH_MAX];
1411 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1413 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1414 meshlink_open_params_t params = {
1415 .confbase = (char *)confbase,
1416 .lock_filename = lock_filename,
1417 .name = (char *)name,
1418 .appname = (char *)appname,
1419 .devclass = devclass,
1423 return meshlink_open_ex(¶ms);
1426 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) {
1427 logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen);
1429 if(!confbase || !*confbase) {
1430 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1431 meshlink_errno = MESHLINK_EINVAL;
1435 char lock_filename[PATH_MAX];
1436 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1438 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1439 meshlink_open_params_t params = {
1440 .confbase = (char *)confbase,
1441 .lock_filename = lock_filename,
1442 .name = (char *)name,
1443 .appname = (char *)appname,
1444 .devclass = devclass,
1448 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1452 return meshlink_open_ex(¶ms);
1455 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1456 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass);
1459 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1460 meshlink_errno = MESHLINK_EINVAL;
1464 if(!check_id(name)) {
1465 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1466 meshlink_errno = MESHLINK_EINVAL;
1470 if(!appname || !*appname) {
1471 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1472 meshlink_errno = MESHLINK_EINVAL;
1476 if(strchr(appname, ' ')) {
1477 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1478 meshlink_errno = MESHLINK_EINVAL;
1482 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1483 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1484 meshlink_errno = MESHLINK_EINVAL;
1488 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1489 meshlink_open_params_t params = {
1490 .name = (char *)name,
1491 .appname = (char *)appname,
1492 .devclass = devclass,
1496 return meshlink_open_ex(¶ms);
1499 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1500 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()");
1502 // Validate arguments provided by the application
1503 if(!params->appname || !*params->appname) {
1504 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1505 meshlink_errno = MESHLINK_EINVAL;
1509 if(strchr(params->appname, ' ')) {
1510 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1511 meshlink_errno = MESHLINK_EINVAL;
1515 if(params->name && !check_id(params->name)) {
1516 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1517 meshlink_errno = MESHLINK_EINVAL;
1521 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1522 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1523 meshlink_errno = MESHLINK_EINVAL;
1527 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1528 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1529 meshlink_errno = MESHLINK_EINVAL;
1533 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1535 if(params->confbase) {
1536 mesh->confbase = xstrdup(params->confbase);
1539 mesh->appname = xstrdup(params->appname);
1540 mesh->devclass = params->devclass;
1541 mesh->discovery.enabled = true;
1542 mesh->invitation_timeout = 604800; // 1 week
1543 mesh->netns = params->netns;
1544 mesh->submeshes = NULL;
1545 mesh->log_cb = global_log_cb;
1546 mesh->log_level = global_log_level;
1547 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1549 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1552 randomize(&mesh->session_id, sizeof(mesh->session_id));
1553 } while(mesh->session_id == 0);
1555 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1557 mesh->name = params->name ? xstrdup(params->name) : NULL;
1561 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1563 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1564 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1565 meshlink_close(mesh);
1566 meshlink_errno = MESHLINK_EINTERNAL;
1571 // initialize mutexes and conds
1572 pthread_mutexattr_t attr;
1573 pthread_mutexattr_init(&attr);
1575 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1579 pthread_mutex_init(&mesh->mutex, &attr);
1580 pthread_cond_init(&mesh->cond, NULL);
1582 pthread_cond_init(&mesh->adns_cond, NULL);
1584 mesh->threadstarted = false;
1585 event_loop_init(&mesh->loop);
1586 mesh->loop.data = mesh;
1588 meshlink_queue_init(&mesh->outpacketqueue);
1590 // Atomically lock the configuration directory.
1591 if(!main_config_lock(mesh, params->lock_filename)) {
1592 meshlink_close(mesh);
1596 // If no configuration exists yet, create it.
1598 bool new_configuration = false;
1600 if(!meshlink_confbase_exists(mesh)) {
1602 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1603 meshlink_close(mesh);
1604 meshlink_errno = MESHLINK_ESTORAGE;
1608 if(!meshlink_setup(mesh)) {
1609 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1610 meshlink_close(mesh);
1614 new_configuration = true;
1616 if(!meshlink_read_config(mesh)) {
1617 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1618 meshlink_close(mesh);
1623 mesh->storage_policy = params->storage_policy;
1626 struct WSAData wsa_state;
1627 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1630 // Setup up everything
1631 // TODO: we should not open listening sockets yet
1633 bool success = false;
1635 if(mesh->netns != -1) {
1639 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1640 void *retval = NULL;
1641 success = pthread_join(thr, &retval) == 0 && retval;
1645 meshlink_errno = MESHLINK_EINTERNAL;
1648 #endif // HAVE_SETNS
1650 success = setup_network(mesh);
1654 meshlink_close(mesh);
1655 meshlink_errno = MESHLINK_ENETWORK;
1659 add_local_addresses(mesh);
1661 if(!node_write_config(mesh, mesh->self, new_configuration)) {
1662 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1666 idle_set(&mesh->loop, idle, mesh);
1668 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1672 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1673 logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh);
1675 meshlink_submesh_t *s = NULL;
1678 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1679 meshlink_errno = MESHLINK_EINVAL;
1683 if(!submesh || !*submesh) {
1684 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1685 meshlink_errno = MESHLINK_EINVAL;
1690 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1694 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1696 pthread_mutex_unlock(&mesh->mutex);
1701 static void *meshlink_main_loop(void *arg) {
1702 meshlink_handle_t *mesh = arg;
1704 if(mesh->netns != -1) {
1707 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1708 pthread_cond_signal(&mesh->cond);
1713 pthread_cond_signal(&mesh->cond);
1715 #endif // HAVE_SETNS
1718 if(mesh->discovery.enabled) {
1719 discovery_start(mesh);
1722 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1726 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1727 pthread_cond_broadcast(&mesh->cond);
1729 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1731 pthread_mutex_unlock(&mesh->mutex);
1734 if(mesh->discovery.enabled) {
1735 discovery_stop(mesh);
1741 bool meshlink_start(meshlink_handle_t *mesh) {
1743 meshlink_errno = MESHLINK_EINVAL;
1747 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1749 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1754 assert(mesh->private_key);
1755 assert(mesh->self->ecdsa);
1756 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1758 if(mesh->threadstarted) {
1759 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1760 pthread_mutex_unlock(&mesh->mutex);
1764 if(mesh->listen_socket[0].tcp.fd < 0) {
1765 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1766 meshlink_errno = MESHLINK_ENETWORK;
1770 // Reset node connection timers
1771 for splay_each(node_t, n, mesh->nodes) {
1772 n->last_connect_try = 0;
1775 // TODO: open listening sockets first
1777 //Check that a valid name is set
1779 logger(mesh, MESHLINK_ERROR, "No name given!\n");
1780 meshlink_errno = MESHLINK_EINVAL;
1781 pthread_mutex_unlock(&mesh->mutex);
1785 init_outgoings(mesh);
1788 // Start the main thread
1790 event_loop_start(&mesh->loop);
1792 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1793 pthread_attr_t attr;
1794 pthread_attr_init(&attr);
1795 pthread_attr_setstacksize(&attr, 1024 * 1024);
1797 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1798 logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno));
1799 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1800 meshlink_errno = MESHLINK_EINTERNAL;
1801 event_loop_stop(&mesh->loop);
1802 pthread_mutex_unlock(&mesh->mutex);
1806 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1807 mesh->threadstarted = true;
1809 // Ensure we are considered reachable
1812 pthread_mutex_unlock(&mesh->mutex);
1816 void meshlink_stop(meshlink_handle_t *mesh) {
1817 logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n");
1820 meshlink_errno = MESHLINK_EINVAL;
1824 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1828 // Shut down the main thread
1829 event_loop_stop(&mesh->loop);
1831 // Send ourselves a UDP packet to kick the event loop
1832 for(int i = 0; i < mesh->listen_sockets; i++) {
1834 socklen_t salen = sizeof(sa);
1836 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1837 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1841 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1842 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1846 if(mesh->threadstarted) {
1847 // Wait for the main thread to finish
1848 pthread_mutex_unlock(&mesh->mutex);
1850 if(pthread_join(mesh->thread, NULL) != 0) {
1854 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1858 mesh->threadstarted = false;
1861 // Close all metaconnections
1862 if(mesh->connections) {
1863 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1865 connection_t *c = node->data;
1867 terminate_connection(mesh, c, false);
1872 exit_outgoings(mesh);
1874 // Ensure we are considered unreachable
1879 // Try to write out any changed node config files, ignore errors at this point.
1881 for splay_each(node_t, n, mesh->nodes) {
1882 if(n->status.dirty) {
1883 if(!node_write_config(mesh, n, false)) {
1890 pthread_mutex_unlock(&mesh->mutex);
1893 void meshlink_close(meshlink_handle_t *mesh) {
1894 logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n");
1897 meshlink_errno = MESHLINK_EINVAL;
1901 // stop can be called even if mesh has not been started
1902 meshlink_stop(mesh);
1904 // lock is not released after this
1905 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1909 // Close and free all resources used.
1911 close_network_connections(mesh);
1913 logger(mesh, MESHLINK_INFO, "Terminating");
1915 event_loop_exit(&mesh->loop);
1919 if(mesh->confbase) {
1925 ecdsa_free(mesh->invitation_key);
1927 if(mesh->netns != -1) {
1931 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1935 meshlink_queue_exit(&mesh->outpacketqueue);
1938 free(mesh->appname);
1939 free(mesh->confbase);
1940 free(mesh->config_key);
1941 free(mesh->external_address_url);
1943 ecdsa_free(mesh->private_key);
1945 if(mesh->invitation_addresses) {
1946 list_delete_list(mesh->invitation_addresses);
1949 main_config_unlock(mesh);
1951 pthread_mutex_unlock(&mesh->mutex);
1952 pthread_mutex_destroy(&mesh->mutex);
1954 memset(mesh, 0, sizeof(*mesh));
1959 bool meshlink_destroy_ex(const meshlink_open_params_t *params) {
1960 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n");
1963 meshlink_errno = MESHLINK_EINVAL;
1967 if(!params->confbase) {
1968 /* Ephemeral instances */
1972 /* Exit early if the confbase directory itself doesn't exist */
1973 if(access(params->confbase, F_OK) && errno == ENOENT) {
1977 /* Take the lock the same way meshlink_open() would. */
1978 FILE *lockfile = fopen(params->lock_filename, "w+");
1981 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno));
1982 meshlink_errno = MESHLINK_ESTORAGE;
1987 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1991 // TODO: use _locking()?
1994 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1995 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename);
1997 meshlink_errno = MESHLINK_EBUSY;
2003 if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) {
2004 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno));
2008 if(unlink(params->lock_filename)) {
2009 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno));
2011 meshlink_errno = MESHLINK_ESTORAGE;
2017 if(!sync_path(params->confbase)) {
2018 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno));
2019 meshlink_errno = MESHLINK_ESTORAGE;
2026 bool meshlink_destroy(const char *confbase) {
2027 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase);
2029 char lock_filename[PATH_MAX];
2030 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
2032 meshlink_open_params_t params = {
2033 .confbase = (char *)confbase,
2034 .lock_filename = lock_filename,
2037 return meshlink_destroy_ex(¶ms);
2040 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
2041 logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb);
2044 meshlink_errno = MESHLINK_EINVAL;
2048 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2052 mesh->receive_cb = cb;
2053 pthread_mutex_unlock(&mesh->mutex);
2056 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
2057 logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb);
2060 meshlink_errno = MESHLINK_EINVAL;
2064 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2068 mesh->connection_try_cb = cb;
2069 pthread_mutex_unlock(&mesh->mutex);
2072 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
2073 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb);
2076 meshlink_errno = MESHLINK_EINVAL;
2080 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2084 mesh->node_status_cb = cb;
2085 pthread_mutex_unlock(&mesh->mutex);
2088 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
2089 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb);
2092 meshlink_errno = MESHLINK_EINVAL;
2096 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2100 mesh->node_pmtu_cb = cb;
2101 pthread_mutex_unlock(&mesh->mutex);
2104 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
2105 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb);
2108 meshlink_errno = MESHLINK_EINVAL;
2112 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2116 mesh->node_duplicate_cb = cb;
2117 pthread_mutex_unlock(&mesh->mutex);
2120 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
2121 logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb);
2124 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2129 mesh->log_level = cb ? level : 0;
2130 pthread_mutex_unlock(&mesh->mutex);
2133 global_log_level = cb ? level : 0;
2137 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2138 logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb);
2141 meshlink_errno = MESHLINK_EINVAL;
2145 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2149 mesh->error_cb = cb;
2150 pthread_mutex_unlock(&mesh->mutex);
2153 void meshlink_set_blacklisted_cb(struct meshlink_handle *mesh, meshlink_blacklisted_cb_t cb) {
2154 logger(mesh, MESHLINK_DEBUG, "meshlink_set_blacklisted_cb(%p)", (void *)(intptr_t)cb);
2157 meshlink_errno = MESHLINK_EINVAL;
2161 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2165 mesh->blacklisted_cb = cb;
2166 pthread_mutex_unlock(&mesh->mutex);
2169 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2170 meshlink_packethdr_t *hdr;
2172 if(len > MAXSIZE - sizeof(*hdr)) {
2173 meshlink_errno = MESHLINK_EINVAL;
2177 node_t *n = (node_t *)destination;
2179 if(n->status.blacklisted) {
2180 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2181 meshlink_errno = MESHLINK_EBLACKLISTED;
2185 // Prepare the packet
2186 packet->probe = false;
2187 packet->tcp = false;
2188 packet->len = len + sizeof(*hdr);
2190 hdr = (meshlink_packethdr_t *)packet->data;
2191 memset(hdr, 0, sizeof(*hdr));
2192 // leave the last byte as 0 to make sure strings are always
2193 // null-terminated if they are longer than the buffer
2194 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2195 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2197 memcpy(packet->data + sizeof(*hdr), data, len);
2202 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2204 assert(destination);
2208 // Prepare the packet
2209 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2213 // Send it immediately
2214 route(mesh, mesh->self, mesh->packet);
2219 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2220 logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len);
2222 // Validate arguments
2223 if(!mesh || !destination) {
2224 meshlink_errno = MESHLINK_EINVAL;
2233 meshlink_errno = MESHLINK_EINVAL;
2237 // Prepare the packet
2238 vpn_packet_t *packet = malloc(sizeof(*packet));
2241 meshlink_errno = MESHLINK_ENOMEM;
2245 if(!prepare_packet(mesh, destination, data, len, packet)) {
2251 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2253 meshlink_errno = MESHLINK_ENOMEM;
2257 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2259 // Notify event loop
2260 signal_trigger(&mesh->loop, &mesh->datafromapp);
2265 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2267 meshlink_handle_t *mesh = data;
2269 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2271 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2272 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2273 route(mesh, mesh->self, packet);
2278 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2279 if(!mesh || !destination) {
2280 meshlink_errno = MESHLINK_EINVAL;
2284 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2288 node_t *n = (node_t *)destination;
2290 if(!n->status.reachable) {
2291 pthread_mutex_unlock(&mesh->mutex);
2294 } else if(n->mtuprobes > 30 && n->minmtu) {
2295 pthread_mutex_unlock(&mesh->mutex);
2298 pthread_mutex_unlock(&mesh->mutex);
2303 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2304 if(!mesh || !node) {
2305 meshlink_errno = MESHLINK_EINVAL;
2309 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2313 node_t *n = (node_t *)node;
2315 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2316 meshlink_errno = MESHLINK_EINTERNAL;
2317 pthread_mutex_unlock(&mesh->mutex);
2321 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2324 meshlink_errno = MESHLINK_EINTERNAL;
2327 pthread_mutex_unlock(&mesh->mutex);
2331 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2333 meshlink_errno = MESHLINK_EINVAL;
2337 return (meshlink_node_t *)mesh->self;
2340 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2341 if(!mesh || !name) {
2342 meshlink_errno = MESHLINK_EINVAL;
2348 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2352 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2353 pthread_mutex_unlock(&mesh->mutex);
2356 meshlink_errno = MESHLINK_ENOENT;
2359 return (meshlink_node_t *)n;
2362 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2363 if(!mesh || !name) {
2364 meshlink_errno = MESHLINK_EINVAL;
2368 meshlink_submesh_t *submesh = NULL;
2370 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2374 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2375 pthread_mutex_unlock(&mesh->mutex);
2378 meshlink_errno = MESHLINK_ENOENT;
2384 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2385 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2386 meshlink_errno = MESHLINK_EINVAL;
2390 meshlink_node_t **result;
2393 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2397 *nmemb = mesh->nodes->count;
2398 result = realloc(nodes, *nmemb * sizeof(*nodes));
2401 meshlink_node_t **p = result;
2403 for splay_each(node_t, n, mesh->nodes) {
2404 *p++ = (meshlink_node_t *)n;
2409 meshlink_errno = MESHLINK_ENOMEM;
2412 pthread_mutex_unlock(&mesh->mutex);
2417 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) {
2418 meshlink_node_t **result;
2420 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2426 for splay_each(node_t, n, mesh->nodes) {
2427 if(search_node(n, condition)) {
2434 pthread_mutex_unlock(&mesh->mutex);
2438 result = realloc(nodes, *nmemb * sizeof(*nodes));
2441 meshlink_node_t **p = result;
2443 for splay_each(node_t, n, mesh->nodes) {
2444 if(search_node(n, condition)) {
2445 *p++ = (meshlink_node_t *)n;
2451 meshlink_errno = MESHLINK_ENOMEM;
2454 pthread_mutex_unlock(&mesh->mutex);
2459 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2460 dev_class_t *devclass = (dev_class_t *)condition;
2462 if(*devclass == (dev_class_t)node->devclass) {
2469 static bool search_node_by_blacklisted(const node_t *node, const void *condition) {
2470 return *(bool *)condition == node->status.blacklisted;
2473 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2474 if(condition == node->submesh) {
2486 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2487 const struct time_range *range = condition;
2488 time_t start = node->last_reachable;
2489 time_t end = node->last_unreachable;
2499 if(range->end >= range->start) {
2500 return start <= range->end && end >= range->start;
2502 return start > range->start || end < range->end;
2506 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) {
2507 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2508 meshlink_errno = MESHLINK_EINVAL;
2512 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2515 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2516 if(!mesh || !submesh || !nmemb) {
2517 meshlink_errno = MESHLINK_EINVAL;
2521 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2524 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) {
2525 if(!mesh || !nmemb) {
2526 meshlink_errno = MESHLINK_EINVAL;
2530 struct time_range range = {start, end};
2532 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2535 meshlink_node_t **meshlink_get_all_nodes_by_blacklisted(meshlink_handle_t *mesh, bool blacklisted, meshlink_node_t **nodes, size_t *nmemb) {
2536 if(!mesh || !nmemb) {
2537 meshlink_errno = MESHLINK_EINVAL;
2541 return meshlink_get_all_nodes_by_condition(mesh, &blacklisted, nodes, nmemb, search_node_by_blacklisted);
2544 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2545 if(!mesh || !node) {
2546 meshlink_errno = MESHLINK_EINVAL;
2550 dev_class_t devclass;
2552 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2556 devclass = ((node_t *)node)->devclass;
2558 pthread_mutex_unlock(&mesh->mutex);
2563 bool meshlink_get_node_tiny(meshlink_handle_t *mesh, meshlink_node_t *node) {
2564 if(!mesh || !node) {
2565 meshlink_errno = MESHLINK_EINVAL;
2571 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2575 tiny = ((node_t *)node)->status.tiny;
2577 pthread_mutex_unlock(&mesh->mutex);
2582 bool meshlink_get_node_blacklisted(meshlink_handle_t *mesh, meshlink_node_t *node) {
2584 meshlink_errno = MESHLINK_EINVAL;
2588 return mesh->default_blacklist;
2593 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2597 blacklisted = ((node_t *)node)->status.blacklisted;
2599 pthread_mutex_unlock(&mesh->mutex);
2604 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2605 if(!mesh || !node) {
2606 meshlink_errno = MESHLINK_EINVAL;
2610 node_t *n = (node_t *)node;
2612 meshlink_submesh_t *s;
2614 s = (meshlink_submesh_t *)n->submesh;
2619 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2620 if(!mesh || !node) {
2621 meshlink_errno = MESHLINK_EINVAL;
2625 node_t *n = (node_t *)node;
2628 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2632 reachable = n->status.reachable && !n->status.blacklisted;
2634 if(last_reachable) {
2635 *last_reachable = n->last_reachable;
2638 if(last_unreachable) {
2639 *last_unreachable = n->last_unreachable;
2642 pthread_mutex_unlock(&mesh->mutex);
2647 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2648 logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen);
2650 if(!mesh || !data || !len || !signature || !siglen) {
2651 meshlink_errno = MESHLINK_EINVAL;
2655 if(*siglen < MESHLINK_SIGLEN) {
2656 meshlink_errno = MESHLINK_EINVAL;
2660 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2664 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2665 meshlink_errno = MESHLINK_EINTERNAL;
2666 pthread_mutex_unlock(&mesh->mutex);
2670 *siglen = MESHLINK_SIGLEN;
2671 pthread_mutex_unlock(&mesh->mutex);
2675 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2676 logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen);
2678 if(!mesh || !source || !data || !len || !signature) {
2679 meshlink_errno = MESHLINK_EINVAL;
2683 if(siglen != MESHLINK_SIGLEN) {
2684 meshlink_errno = MESHLINK_EINVAL;
2688 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2694 struct node_t *n = (struct node_t *)source;
2696 if(!node_read_public_key(mesh, n)) {
2697 meshlink_errno = MESHLINK_EINTERNAL;
2700 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2703 pthread_mutex_unlock(&mesh->mutex);
2707 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2708 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2712 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2715 // TODO: Update invitation key if necessary?
2718 pthread_mutex_unlock(&mesh->mutex);
2720 return mesh->invitation_key;
2723 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2724 logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)");
2726 if(!mesh || !node || !address) {
2727 meshlink_errno = MESHLINK_EINVAL;
2731 if(!is_valid_hostname(address)) {
2732 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address);
2733 meshlink_errno = MESHLINK_EINVAL;
2737 if((node_t *)node != mesh->self && !port) {
2738 logger(mesh, MESHLINK_ERROR, "Missing port number!");
2739 meshlink_errno = MESHLINK_EINVAL;
2744 if(port && !is_valid_port(port)) {
2745 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address);
2746 meshlink_errno = MESHLINK_EINVAL;
2750 char *canonical_address;
2752 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2754 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2758 node_t *n = (node_t *)node;
2759 free(n->canonical_address);
2760 n->canonical_address = canonical_address;
2762 if(!node_write_config(mesh, n, false)) {
2763 pthread_mutex_unlock(&mesh->mutex);
2767 pthread_mutex_unlock(&mesh->mutex);
2769 return config_sync(mesh, "current");
2772 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2773 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)");
2775 if(!mesh || !node) {
2776 meshlink_errno = MESHLINK_EINVAL;
2780 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2784 node_t *n = (node_t *)node;
2785 free(n->canonical_address);
2786 n->canonical_address = NULL;
2788 if(!node_write_config(mesh, n, false)) {
2789 pthread_mutex_unlock(&mesh->mutex);
2793 pthread_mutex_unlock(&mesh->mutex);
2795 return config_sync(mesh, "current");
2798 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2799 logger(mesh, MESHLINK_DEBUG, "meshlink_add_invitation_address(%s, %s)", address ? address : "(null)", port ? port : "(null)");
2801 if(!mesh || !address) {
2802 meshlink_errno = MESHLINK_EINVAL;
2806 if(!is_valid_hostname(address)) {
2807 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s\n", address);
2808 meshlink_errno = MESHLINK_EINVAL;
2812 if(port && !is_valid_port(port)) {
2813 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s\n", address);
2814 meshlink_errno = MESHLINK_EINVAL;
2821 xasprintf(&combo, "%s/%s", address, port);
2823 combo = xstrdup(address);
2826 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2830 if(!mesh->invitation_addresses) {
2831 mesh->invitation_addresses = list_alloc((list_action_t)free);
2834 list_insert_tail(mesh->invitation_addresses, combo);
2835 pthread_mutex_unlock(&mesh->mutex);
2840 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2841 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_invitation_addresses()");
2844 meshlink_errno = MESHLINK_EINVAL;
2848 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2852 if(mesh->invitation_addresses) {
2853 list_delete_list(mesh->invitation_addresses);
2854 mesh->invitation_addresses = NULL;
2857 pthread_mutex_unlock(&mesh->mutex);
2860 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2861 logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)");
2863 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2866 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2867 logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()");
2870 meshlink_errno = MESHLINK_EINVAL;
2874 char *address = meshlink_get_external_address(mesh);
2880 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2886 int meshlink_get_port(meshlink_handle_t *mesh) {
2888 meshlink_errno = MESHLINK_EINVAL;
2893 meshlink_errno = MESHLINK_EINTERNAL;
2899 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2903 port = atoi(mesh->myport);
2904 pthread_mutex_unlock(&mesh->mutex);
2909 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2910 logger(mesh, MESHLINK_DEBUG, "meshlink_set_port(%d)", port);
2912 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2913 meshlink_errno = MESHLINK_EINVAL;
2917 if(mesh->myport && port == atoi(mesh->myport)) {
2921 if(!try_bind(mesh, port)) {
2922 meshlink_errno = MESHLINK_ENETWORK;
2926 devtool_trybind_probe();
2930 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2934 if(mesh->threadstarted) {
2935 meshlink_errno = MESHLINK_EINVAL;
2940 xasprintf(&mesh->myport, "%d", port);
2942 /* Close down the network. This also deletes mesh->self. */
2943 close_network_connections(mesh);
2945 /* Recreate mesh->self. */
2946 mesh->self = new_node();
2947 mesh->self->name = xstrdup(mesh->name);
2948 mesh->self->devclass = mesh->devclass;
2949 mesh->self->session_id = mesh->session_id;
2950 xasprintf(&mesh->myport, "%d", port);
2952 if(!node_read_public_key(mesh, mesh->self)) {
2953 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2954 meshlink_errno = MESHLINK_ESTORAGE;
2955 free_node(mesh->self);
2958 } else if(!setup_network(mesh)) {
2959 meshlink_errno = MESHLINK_ENETWORK;
2963 /* Rebuild our own list of recent addresses */
2964 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2965 add_local_addresses(mesh);
2967 /* Write meshlink.conf with the updated port number */
2968 write_main_config_files(mesh);
2970 rval = config_sync(mesh, "current");
2973 pthread_mutex_unlock(&mesh->mutex);
2975 return rval && meshlink_get_port(mesh) == port;
2978 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2979 logger(mesh, MESHLINK_DEBUG, "meshlink_invitation_timeout(%d)", timeout);
2981 mesh->invitation_timeout = timeout;
2984 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2985 logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s, %u)", submesh ? submesh->name : "(null)", name ? name : "(null)", flags);
2987 meshlink_submesh_t *s = NULL;
2990 meshlink_errno = MESHLINK_EINVAL;
2995 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2998 logger(mesh, MESHLINK_ERROR, "Invalid submesh handle.\n");
2999 meshlink_errno = MESHLINK_EINVAL;
3003 s = (meshlink_submesh_t *)mesh->self->submesh;
3006 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3010 // Check validity of the new node's name
3011 if(!check_id(name)) {
3012 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
3013 meshlink_errno = MESHLINK_EINVAL;
3014 pthread_mutex_unlock(&mesh->mutex);
3018 // Ensure no host configuration file with that name exists
3019 if(config_exists(mesh, "current", name)) {
3020 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
3021 meshlink_errno = MESHLINK_EEXIST;
3022 pthread_mutex_unlock(&mesh->mutex);
3026 // Ensure no other nodes know about this name
3027 if(lookup_node(mesh, name)) {
3028 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
3029 meshlink_errno = MESHLINK_EEXIST;
3030 pthread_mutex_unlock(&mesh->mutex);
3034 // Get the local address
3035 char *address = get_my_hostname(mesh, flags);
3038 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
3039 meshlink_errno = MESHLINK_ERESOLV;
3040 pthread_mutex_unlock(&mesh->mutex);
3044 if(!refresh_invitation_key(mesh)) {
3045 meshlink_errno = MESHLINK_EINTERNAL;
3046 pthread_mutex_unlock(&mesh->mutex);
3050 // If we changed our own host config file, write it out now
3051 if(mesh->self->status.dirty) {
3052 if(!node_write_config(mesh, mesh->self, false)) {
3053 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
3054 pthread_mutex_unlock(&mesh->mutex);
3061 // Create a hash of the key.
3062 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
3063 sha512(fingerprint, strlen(fingerprint), hash);
3064 b64encode_urlsafe(hash, hash, 18);
3066 // Create a random cookie for this invitation.
3068 randomize(cookie, 18);
3070 // Create a filename that doesn't reveal the cookie itself
3071 char buf[18 + strlen(fingerprint)];
3072 char cookiehash[64];
3073 memcpy(buf, cookie, 18);
3074 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
3075 sha512(buf, sizeof(buf), cookiehash);
3076 b64encode_urlsafe(cookiehash, cookiehash, 18);
3078 b64encode_urlsafe(cookie, cookie, 18);
3082 /* Construct the invitation file */
3083 uint8_t outbuf[4096];
3084 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
3086 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
3087 packmsg_add_str(&inv, name);
3088 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
3089 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
3091 /* TODO: Add several host config files to bootstrap connections.
3092 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
3093 * and are not blacklisted.
3095 config_t configs[5];
3096 memset(configs, 0, sizeof(configs));
3099 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
3103 /* Append host config files to the invitation file */
3104 packmsg_add_array(&inv, count);
3106 for(int i = 0; i < count; i++) {
3107 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
3108 config_free(&configs[i]);
3111 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
3113 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
3114 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
3115 meshlink_errno = MESHLINK_ESTORAGE;
3116 pthread_mutex_unlock(&mesh->mutex);
3120 // Create an URL from the local address, key hash and cookie
3122 xasprintf(&url, "%s/%s%s", address, hash, cookie);
3125 pthread_mutex_unlock(&mesh->mutex);
3129 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
3130 logger(mesh, MESHLINK_DEBUG, "meshlink_invite_ex(%s, %s)", submesh ? submesh->name : "(null)", name ? name : "(null)");
3132 return meshlink_invite_ex(mesh, submesh, name, 0);
3135 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
3136 logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)");
3138 if(!mesh || !invitation) {
3139 meshlink_errno = MESHLINK_EINVAL;
3143 if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) {
3144 meshlink_errno = MESHLINK_EINVAL;
3148 join_state_t state = {
3153 ecdsa_t *key = NULL;
3154 ecdsa_t *hiskey = NULL;
3156 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
3157 char copy[strlen(invitation) + 1];
3159 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3163 //Before doing meshlink_join make sure we are not connected to another mesh
3164 if(mesh->threadstarted) {
3165 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
3166 meshlink_errno = MESHLINK_EINVAL;
3170 // 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.
3171 if(mesh->nodes->count > 1) {
3172 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
3173 meshlink_errno = MESHLINK_EINVAL;
3177 strcpy(copy, invitation);
3179 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
3181 char *slash = strchr(copy, '/');
3189 if(strlen(slash) != 48) {
3193 char *address = copy;
3196 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
3200 if(mesh->inviter_commits_first) {
3201 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
3204 // Generate a throw-away key for the invitation.
3205 key = ecdsa_generate();
3208 meshlink_errno = MESHLINK_EINTERNAL;
3212 char *b64key = ecdsa_get_base64_public_key(key);
3215 while(address && *address) {
3216 // We allow commas in the address part to support multiple addresses in one invitation URL.
3217 comma = strchr(address, ',');
3223 // Split of the port
3224 port = strrchr(address, ':');
3232 // IPv6 address are enclosed in brackets, per RFC 3986
3233 if(*address == '[') {
3235 char *bracket = strchr(address, ']');
3248 // Connect to the meshlink daemon mentioned in the URL.
3249 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 30);
3252 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
3253 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
3255 if(state.sock == -1) {
3256 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
3257 meshlink_errno = MESHLINK_ENETWORK;
3263 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3266 set_timeout(state.sock, 5000);
3268 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3269 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3270 meshlink_errno = MESHLINK_ENETWORK;
3271 closesocket(state.sock);
3281 meshlink_errno = MESHLINK_ERESOLV;
3284 if(state.sock != -1 || !comma) {
3291 if(state.sock == -1) {
3295 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3297 // Tell him we have an invitation, and give him our throw-away key.
3301 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3302 logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3303 meshlink_errno = MESHLINK_ENETWORK;
3309 char hisname[4096] = "";
3310 int code, hismajor, hisminor = 0;
3312 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) {
3313 logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n");
3314 meshlink_errno = MESHLINK_ENETWORK;
3318 // Check if the hash of the key he gave us matches the hash in the URL.
3319 char *fingerprint = state.line + 2;
3322 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3323 logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2);
3324 meshlink_errno = MESHLINK_EINTERNAL;
3328 if(memcmp(hishash, state.hash, 18)) {
3329 logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2);
3330 meshlink_errno = MESHLINK_EPEER;
3334 hiskey = ecdsa_set_base64_public_key(fingerprint);
3337 meshlink_errno = MESHLINK_EINTERNAL;
3341 // Start an SPTPS session
3342 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3343 meshlink_errno = MESHLINK_EINTERNAL;
3347 // Feed rest of input buffer to SPTPS
3348 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3349 meshlink_errno = MESHLINK_EPEER;
3354 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3356 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3358 if(errno == EINTR) {
3362 logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3363 meshlink_errno = MESHLINK_ENETWORK;
3367 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3368 meshlink_errno = MESHLINK_EPEER;
3373 if(!state.success) {
3374 logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n");
3375 meshlink_errno = MESHLINK_EPEER;
3379 sptps_stop(&state.sptps);
3382 closesocket(state.sock);
3384 pthread_mutex_unlock(&mesh->mutex);
3388 logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n");
3389 meshlink_errno = MESHLINK_EINVAL;
3391 sptps_stop(&state.sptps);
3395 if(state.sock != -1) {
3396 closesocket(state.sock);
3399 pthread_mutex_unlock(&mesh->mutex);
3403 char *meshlink_export(meshlink_handle_t *mesh) {
3405 meshlink_errno = MESHLINK_EINVAL;
3409 // Create a config file on the fly.
3412 packmsg_output_t out = {buf, sizeof(buf)};
3413 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3414 packmsg_add_str(&out, mesh->name);
3415 packmsg_add_str(&out, CORE_MESH);
3417 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3421 packmsg_add_int32(&out, mesh->self->devclass);
3422 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3423 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3425 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3426 char *canonical_address = NULL;
3427 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3428 packmsg_add_str(&out, canonical_address);
3429 free(canonical_address);
3431 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3436 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3437 if(mesh->self->recent[i].sa.sa_family) {
3444 packmsg_add_array(&out, count);
3446 for(uint32_t i = 0; i < count; i++) {
3447 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3450 packmsg_add_int64(&out, 0);
3451 packmsg_add_int64(&out, 0);
3453 pthread_mutex_unlock(&mesh->mutex);
3455 if(!packmsg_output_ok(&out)) {
3456 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
3457 meshlink_errno = MESHLINK_EINTERNAL;
3461 // Prepare a base64-encoded packmsg array containing our config file
3463 uint32_t len = packmsg_output_size(&out, buf);
3464 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3465 uint8_t *buf2 = xmalloc(len2);
3466 packmsg_output_t out2 = {buf2, len2};
3467 packmsg_add_array(&out2, 1);
3468 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3470 if(!packmsg_output_ok(&out2)) {
3471 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
3472 meshlink_errno = MESHLINK_EINTERNAL;
3477 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3479 return (char *)buf2;
3482 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3483 logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data);
3485 if(!mesh || !data) {
3486 meshlink_errno = MESHLINK_EINVAL;
3490 size_t datalen = strlen(data);
3491 uint8_t *buf = xmalloc(datalen);
3492 int buflen = b64decode(data, buf, datalen);
3495 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3497 meshlink_errno = MESHLINK_EPEER;
3501 packmsg_input_t in = {buf, buflen};
3502 uint32_t count = packmsg_get_array(&in);
3505 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3507 meshlink_errno = MESHLINK_EPEER;
3511 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3517 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3523 packmsg_input_t in2 = {data2, len2};
3524 uint32_t version = packmsg_get_uint32(&in2);
3525 char *name = packmsg_get_str_dup(&in2);
3527 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3529 packmsg_input_invalidate(&in);
3533 if(!check_id(name)) {
3538 node_t *n = lookup_node(mesh, name);
3541 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3549 config_t config = {data2, len2};
3551 if(!node_read_from_config(mesh, n, &config)) {
3553 packmsg_input_invalidate(&in);
3557 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3558 n->last_reachable = 0;
3559 n->last_unreachable = 0;
3561 if(!node_write_config(mesh, n, true)) {
3570 pthread_mutex_unlock(&mesh->mutex);
3574 if(!packmsg_done(&in)) {
3575 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3576 meshlink_errno = MESHLINK_EPEER;
3580 if(!config_sync(mesh, "current")) {
3587 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3588 if(n == mesh->self) {
3589 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3590 meshlink_errno = MESHLINK_EINVAL;
3594 if(n->status.blacklisted) {
3595 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3599 n->status.blacklisted = true;
3601 /* Immediately shut down any connections we have with the blacklisted node.
3602 * We can't call terminate_connection(), because we might be called from a callback function.
3604 for list_each(connection_t, c, mesh->connections) {
3606 if(c->status.active) {
3607 send_error(mesh, c, BLACKLISTED, "blacklisted");
3610 shutdown(c->socket, SHUT_RDWR);
3614 utcp_reset_all_connections(n->utcp);
3620 n->status.udp_confirmed = false;
3622 if(n->status.reachable) {
3623 n->last_unreachable = time(NULL);
3626 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3627 * manually call the status callback if necessary.
3629 if(n->status.reachable && mesh->node_status_cb) {
3630 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3633 /* Remove any outstanding invitations */
3634 invitation_purge_node(mesh, n->name);
3636 return node_write_config(mesh, n, true) && config_sync(mesh, "current");
3639 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3640 logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist(%s)", node ? node->name : "(null)");
3642 if(!mesh || !node) {
3643 meshlink_errno = MESHLINK_EINVAL;
3647 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3651 if(!blacklist(mesh, (node_t *)node)) {
3652 pthread_mutex_unlock(&mesh->mutex);
3656 pthread_mutex_unlock(&mesh->mutex);
3658 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3662 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3663 logger(mesh, MESHLINK_DEBUG, "meshlink_blacklist_by_name(%s)", name ? name : "(null)");
3665 if(!mesh || !name) {
3666 meshlink_errno = MESHLINK_EINVAL;
3670 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3674 node_t *n = lookup_node(mesh, (char *)name);
3678 n->name = xstrdup(name);
3682 if(!blacklist(mesh, (node_t *)n)) {
3683 pthread_mutex_unlock(&mesh->mutex);
3687 pthread_mutex_unlock(&mesh->mutex);
3689 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3693 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3694 if(n == mesh->self) {
3695 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3696 meshlink_errno = MESHLINK_EINVAL;
3700 if(!n->status.blacklisted) {
3701 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3705 n->status.blacklisted = false;
3707 if(n->status.reachable) {
3708 n->last_reachable = time(NULL);
3709 update_node_status(mesh, n);
3712 return node_write_config(mesh, n, true) && config_sync(mesh, "current");
3715 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3716 logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist(%s)", node ? node->name : "(null)");
3718 if(!mesh || !node) {
3719 meshlink_errno = MESHLINK_EINVAL;
3723 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3727 if(!whitelist(mesh, (node_t *)node)) {
3728 pthread_mutex_unlock(&mesh->mutex);
3732 pthread_mutex_unlock(&mesh->mutex);
3734 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3738 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3739 logger(mesh, MESHLINK_DEBUG, "meshlink_whitelist_by_name(%s)", name ? name : "(null)");
3741 if(!mesh || !name) {
3742 meshlink_errno = MESHLINK_EINVAL;
3746 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3750 node_t *n = lookup_node(mesh, (char *)name);
3754 n->name = xstrdup(name);
3758 if(!whitelist(mesh, (node_t *)n)) {
3759 pthread_mutex_unlock(&mesh->mutex);
3763 pthread_mutex_unlock(&mesh->mutex);
3765 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3769 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3770 mesh->default_blacklist = blacklist;
3773 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3774 logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)");
3776 if(!mesh || !node) {
3777 meshlink_errno = MESHLINK_EINVAL;
3781 node_t *n = (node_t *)node;
3783 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3787 /* Check that the node is not reachable */
3788 if(n->status.reachable || n->connection) {
3789 pthread_mutex_unlock(&mesh->mutex);
3790 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3794 /* Check that we don't have any active UTCP connections */
3795 if(n->utcp && utcp_is_active(n->utcp)) {
3796 pthread_mutex_unlock(&mesh->mutex);
3797 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3801 /* Check that we have no active connections to this node */
3802 for list_each(connection_t, c, mesh->connections) {
3804 pthread_mutex_unlock(&mesh->mutex);
3805 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3810 /* Remove any pending outgoings to this node */
3811 if(mesh->outgoings) {
3812 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3813 if(outgoing->node == n) {
3814 list_delete_node(mesh->outgoings, list_node);
3819 /* Delete the config file for this node */
3820 if(!config_delete(mesh, "current", n->name)) {
3821 pthread_mutex_unlock(&mesh->mutex);
3825 /* Delete any pending invitations */
3826 invitation_purge_node(mesh, n->name);
3828 /* Delete the node struct and any remaining edges referencing this node */
3831 pthread_mutex_unlock(&mesh->mutex);
3833 return config_sync(mesh, "current");
3836 /* Hint that a hostname may be found at an address
3837 * See header file for detailed comment.
3839 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3840 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr);
3842 if(!mesh || !node || !addr) {
3843 meshlink_errno = EINVAL;
3847 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3851 node_t *n = (node_t *)node;
3853 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3854 if(!node_write_config(mesh, n, false)) {
3855 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3859 pthread_mutex_unlock(&mesh->mutex);
3860 // @TODO do we want to fire off a connection attempt right away?
3863 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3865 node_t *n = utcp->priv;
3866 meshlink_handle_t *mesh = n->mesh;
3868 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3869 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3871 return mesh->channel_accept_cb;
3875 /* Finish one AIO buffer, return true if the channel is still open. */
3876 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3877 meshlink_aio_buffer_t *aio = *head;
3881 channel->in_callback = true;
3884 if(aio->cb.buffer) {
3885 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3889 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3893 channel->in_callback = false;
3906 /* Finish all AIO buffers, return true if the channel is still open. */
3907 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3909 if(!aio_finish_one(mesh, channel, head)) {
3917 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3918 meshlink_channel_t *channel = connection->priv;
3924 node_t *n = channel->node;
3925 meshlink_handle_t *mesh = n->mesh;
3927 if(n->status.destroyed) {
3928 meshlink_channel_close(mesh, channel);
3932 const char *p = data;
3935 while(channel->aio_receive) {
3937 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3938 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3945 meshlink_aio_buffer_t *aio = channel->aio_receive;
3946 size_t todo = aio->len - aio->done;
3953 memcpy((char *)aio->data + aio->done, p, todo);
3955 ssize_t result = write(aio->fd, p, todo);
3958 if(result < 0 && errno == EINTR) {
3962 /* Writing to fd failed, cancel just this AIO buffer. */
3963 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3965 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3979 if(aio->done == aio->len) {
3980 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3990 if(channel->receive_cb) {
3991 channel->receive_cb(mesh, channel, p, left);
3997 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3998 node_t *n = utcp_connection->utcp->priv;
4004 meshlink_handle_t *mesh = n->mesh;
4006 if(!mesh->channel_accept_cb) {
4010 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4012 channel->c = utcp_connection;
4014 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
4015 utcp_accept(utcp_connection, channel_recv, channel);
4021 static void channel_retransmit(struct utcp_connection *utcp_connection) {
4022 node_t *n = utcp_connection->utcp->priv;
4023 meshlink_handle_t *mesh = n->mesh;
4025 if(n->mtuprobes == 31 && n->mtutimeout.cb) {
4026 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
4032 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
4033 node_t *n = utcp->priv;
4035 if(n->status.destroyed) {
4039 meshlink_handle_t *mesh = n->mesh;
4040 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
4043 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
4044 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
4046 if(!mesh || !channel) {
4047 meshlink_errno = MESHLINK_EINVAL;
4051 channel->receive_cb = cb;
4054 void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
4056 node_t *n = (node_t *)source;
4062 utcp_recv(n->utcp, data, len);
4065 static void channel_poll(struct utcp_connection *connection, size_t len) {
4066 meshlink_channel_t *channel = connection->priv;
4072 node_t *n = channel->node;
4073 meshlink_handle_t *mesh = n->mesh;
4075 while(channel->aio_send) {
4077 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
4078 if(!aio_abort(mesh, channel, &channel->aio_send)) {
4085 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
4086 meshlink_aio_buffer_t *aio = channel->aio_send;
4087 size_t todo = aio->len - aio->done;
4095 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
4097 /* Limit the amount we read at once to avoid stack overflows */
4103 ssize_t result = read(aio->fd, buf, todo);
4107 sent = utcp_send(connection, buf, todo);
4109 if(result < 0 && errno == EINTR) {
4113 /* Reading from fd failed, cancel just this AIO buffer. */
4115 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
4118 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
4126 if(sent != (ssize_t)todo) {
4127 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
4128 if(!aio_abort(mesh, channel, &channel->aio_send)) {
4139 /* If we didn't finish this buffer, exit early. */
4140 if(aio->done < aio->len) {
4144 /* Signal completion of this buffer, and go to the next one. */
4145 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
4154 if(channel->poll_cb) {
4155 channel->poll_cb(mesh, channel, len);
4157 utcp_set_poll_cb(connection, NULL);
4161 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
4162 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
4164 if(!mesh || !channel) {
4165 meshlink_errno = MESHLINK_EINVAL;
4169 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4173 channel->poll_cb = cb;
4174 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
4175 pthread_mutex_unlock(&mesh->mutex);
4178 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
4179 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb);
4182 meshlink_errno = MESHLINK_EINVAL;
4186 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4190 mesh->channel_listen_cb = cb;
4192 pthread_mutex_unlock(&mesh->mutex);
4195 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
4196 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb);
4199 meshlink_errno = MESHLINK_EINVAL;
4203 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4207 mesh->channel_accept_cb = cb;
4209 for splay_each(node_t, n, mesh->nodes) {
4210 if(!n->utcp && n != mesh->self) {
4211 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4212 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4213 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4217 pthread_mutex_unlock(&mesh->mutex);
4220 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4221 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
4223 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
4226 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4227 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
4229 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
4232 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4233 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
4235 if(!mesh || !channel) {
4236 meshlink_errno = MESHLINK_EINVAL;
4240 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4244 utcp_set_sndbuf(channel->c, buf, size);
4245 pthread_mutex_unlock(&mesh->mutex);
4248 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4249 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
4251 if(!mesh || !channel) {
4252 meshlink_errno = MESHLINK_EINVAL;
4256 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4260 utcp_set_rcvbuf(channel->c, buf, size);
4261 pthread_mutex_unlock(&mesh->mutex);
4264 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
4265 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
4267 if(!mesh || !channel) {
4268 meshlink_errno = MESHLINK_EINVAL;
4272 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4276 utcp_set_flags(channel->c, flags);
4277 pthread_mutex_unlock(&mesh->mutex);
4280 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) {
4281 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu, %u)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len, flags);
4284 abort(); // TODO: handle non-NULL data
4287 if(!mesh || !node) {
4288 meshlink_errno = MESHLINK_EINVAL;
4292 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4296 node_t *n = (node_t *)node;
4299 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4300 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4301 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4304 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4305 pthread_mutex_unlock(&mesh->mutex);
4310 if(n->status.blacklisted) {
4311 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
4312 meshlink_errno = MESHLINK_EBLACKLISTED;
4313 pthread_mutex_unlock(&mesh->mutex);
4317 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4319 channel->receive_cb = cb;
4322 channel->priv = (void *)data;
4325 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
4327 pthread_mutex_unlock(&mesh->mutex);
4330 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4338 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) {
4339 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len);
4341 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4344 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4345 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction);
4347 if(!mesh || !channel) {
4348 meshlink_errno = MESHLINK_EINVAL;
4352 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4356 utcp_shutdown(channel->c, direction);
4357 pthread_mutex_unlock(&mesh->mutex);
4360 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4361 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel);
4363 if(!mesh || !channel) {
4364 meshlink_errno = MESHLINK_EINVAL;
4368 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4373 utcp_close(channel->c);
4376 /* Clean up any outstanding AIO buffers. */
4377 aio_abort(mesh, channel, &channel->aio_send);
4378 aio_abort(mesh, channel, &channel->aio_receive);
4381 if(!channel->in_callback) {
4385 pthread_mutex_unlock(&mesh->mutex);
4388 void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4389 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel);
4391 if(!mesh || !channel) {
4392 meshlink_errno = MESHLINK_EINVAL;
4396 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4401 utcp_abort(channel->c);
4404 /* Clean up any outstanding AIO buffers. */
4405 aio_abort(mesh, channel, &channel->aio_send);
4406 aio_abort(mesh, channel, &channel->aio_receive);
4409 if(!channel->in_callback) {
4413 pthread_mutex_unlock(&mesh->mutex);
4416 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4417 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len);
4419 if(!mesh || !channel) {
4420 meshlink_errno = MESHLINK_EINVAL;
4429 meshlink_errno = MESHLINK_EINVAL;
4433 // TODO: more finegrained locking.
4434 // Ideally we want to put the data into the UTCP connection's send buffer.
4435 // Then, preferably only if there is room in the receiver window,
4436 // kick the meshlink thread to go send packets.
4440 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4444 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4445 if(channel->aio_send) {
4448 retval = utcp_send(channel->c, data, len);
4451 pthread_mutex_unlock(&mesh->mutex);
4454 meshlink_errno = MESHLINK_ENETWORK;
4460 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) {
4461 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
4463 if(!mesh || !channel) {
4464 meshlink_errno = MESHLINK_EINVAL;
4469 meshlink_errno = MESHLINK_EINVAL;
4473 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4476 aio->cb.buffer = cb;
4479 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4483 /* Append the AIO buffer descriptor to the end of the chain */
4484 meshlink_aio_buffer_t **p = &channel->aio_send;
4492 /* Ensure the poll callback is set, and call it right now to push data if possible */
4493 utcp_set_poll_cb(channel->c, channel_poll);
4494 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4497 channel_poll(channel->c, todo);
4500 pthread_mutex_unlock(&mesh->mutex);
4505 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) {
4506 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
4508 if(!mesh || !channel) {
4509 meshlink_errno = MESHLINK_EINVAL;
4513 if(!len || fd == -1) {
4514 meshlink_errno = MESHLINK_EINVAL;
4518 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4524 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4528 /* Append the AIO buffer descriptor to the end of the chain */
4529 meshlink_aio_buffer_t **p = &channel->aio_send;
4537 /* Ensure the poll callback is set, and call it right now to push data if possible */
4538 utcp_set_poll_cb(channel->c, channel_poll);
4539 size_t left = utcp_get_rcvbuf_free(channel->c);
4542 channel_poll(channel->c, left);
4545 pthread_mutex_unlock(&mesh->mutex);
4550 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) {
4551 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
4553 if(!mesh || !channel) {
4554 meshlink_errno = MESHLINK_EINVAL;
4559 meshlink_errno = MESHLINK_EINVAL;
4563 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4566 aio->cb.buffer = cb;
4569 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4573 /* Append the AIO buffer descriptor to the end of the chain */
4574 meshlink_aio_buffer_t **p = &channel->aio_receive;
4582 pthread_mutex_unlock(&mesh->mutex);
4587 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) {
4588 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
4590 if(!mesh || !channel) {
4591 meshlink_errno = MESHLINK_EINVAL;
4595 if(!len || fd == -1) {
4596 meshlink_errno = MESHLINK_EINVAL;
4600 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4606 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4610 /* Append the AIO buffer descriptor to the end of the chain */
4611 meshlink_aio_buffer_t **p = &channel->aio_receive;
4619 pthread_mutex_unlock(&mesh->mutex);
4624 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4625 if(!mesh || !channel) {
4626 meshlink_errno = MESHLINK_EINVAL;
4630 return channel->c->flags;
4633 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4634 if(!mesh || !channel) {
4635 meshlink_errno = MESHLINK_EINVAL;
4639 return utcp_get_sendq(channel->c);
4642 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4643 if(!mesh || !channel) {
4644 meshlink_errno = MESHLINK_EINVAL;
4648 return utcp_get_recvq(channel->c);
4651 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4652 if(!mesh || !channel) {
4653 meshlink_errno = MESHLINK_EINVAL;
4657 return utcp_get_mss(channel->node->utcp);
4660 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4661 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout);
4663 if(!mesh || !node) {
4664 meshlink_errno = MESHLINK_EINVAL;
4668 node_t *n = (node_t *)node;
4670 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4675 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4676 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4677 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4680 utcp_set_user_timeout(n->utcp, timeout);
4682 pthread_mutex_unlock(&mesh->mutex);
4685 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4686 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4687 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4688 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4689 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4692 if(mesh->node_status_cb) {
4693 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4696 if(mesh->node_pmtu_cb) {
4697 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4701 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4702 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4704 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4705 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4709 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4710 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4714 n->status.duplicate = true;
4715 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4718 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4719 logger(mesh, MESHLINK_DEBUG, "meshlink_enable_discovery(%d)", enable);
4722 meshlink_errno = MESHLINK_EINVAL;
4726 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4730 if(mesh->discovery.enabled == enable) {
4734 if(mesh->threadstarted) {
4736 discovery_start(mesh);
4738 discovery_stop(mesh);
4742 mesh->discovery.enabled = enable;
4745 pthread_mutex_unlock(&mesh->mutex);
4748 void meshlink_hint_network_change(struct meshlink_handle *mesh) {
4749 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()");
4752 meshlink_errno = MESHLINK_EINVAL;
4756 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4760 if(mesh->discovery.enabled) {
4764 if(mesh->loop.now.tv_sec > mesh->discovery.last_update + 5) {
4765 mesh->discovery.last_update = mesh->loop.now.tv_sec;
4766 handle_network_change(mesh, 1);
4769 pthread_mutex_unlock(&mesh->mutex);
4772 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4773 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout);
4775 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4776 meshlink_errno = EINVAL;
4780 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4781 meshlink_errno = EINVAL;
4785 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4789 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4790 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4791 pthread_mutex_unlock(&mesh->mutex);
4794 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4795 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period);
4797 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4798 meshlink_errno = EINVAL;
4802 if(fast_retry_period < 0) {
4803 meshlink_errno = EINVAL;
4807 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4811 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4812 pthread_mutex_unlock(&mesh->mutex);
4815 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4816 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout);
4818 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4819 meshlink_errno = EINVAL;
4823 if(maxtimeout < 0) {
4824 meshlink_errno = EINVAL;
4828 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4832 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4833 pthread_mutex_unlock(&mesh->mutex);
4836 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4837 logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()");
4843 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4847 handle_network_change(mesh, true);
4849 if(mesh->discovery.enabled) {
4850 discovery_refresh(mesh);
4853 pthread_mutex_unlock(&mesh->mutex);
4856 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4857 logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first);
4860 meshlink_errno = EINVAL;
4864 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4868 mesh->inviter_commits_first = inviter_commits_first;
4869 pthread_mutex_unlock(&mesh->mutex);
4872 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4873 logger(mesh, MESHLINK_DEBUG, "meshlink_set_external_address_discovery_url(%s)", url ? url : "(null)");
4876 meshlink_errno = EINVAL;
4880 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4881 meshlink_errno = EINVAL;
4885 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4889 free(mesh->external_address_url);
4890 mesh->external_address_url = url ? xstrdup(url) : NULL;
4891 pthread_mutex_unlock(&mesh->mutex);
4894 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4895 logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity);
4897 if(!mesh || granularity < 0) {
4898 meshlink_errno = EINVAL;
4902 utcp_set_clock_granularity(granularity);
4905 void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) {
4906 logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy);
4909 meshlink_errno = EINVAL;
4913 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4917 mesh->storage_policy = policy;
4918 pthread_mutex_unlock(&mesh->mutex);
4921 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4924 if(!mesh->connections || !mesh->loop.running) {
4929 signal_trigger(&mesh->loop, &mesh->datafromapp);
4932 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4933 // We should only call the callback function if we are in the background thread.
4934 if(!mesh->error_cb) {
4938 if(!mesh->threadstarted) {
4942 if(mesh->thread == pthread_self()) {
4943 mesh->error_cb(mesh, cb_errno);
4947 static void __attribute__((constructor)) meshlink_init(void) {
4949 utcp_set_clock_granularity(10000);
4952 static void __attribute__((destructor)) meshlink_exit(void) {