2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 const char *url = mesh->external_address_url;
232 url = "http://meshlink.io/host.cgi";
235 /* Find the hostname part between the slashes */
236 if(strncmp(url, "http://", 7)) {
238 meshlink_errno = MESHLINK_EINTERNAL;
242 const char *begin = url + 7;
244 const char *end = strchr(begin, '/');
247 end = begin + strlen(begin);
251 char host[end - begin + 1];
252 strncpy(host, begin, end - begin);
253 host[end - begin] = 0;
255 char *port = strchr(host, ':');
261 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
262 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), SOCK_STREAM, 5);
264 char *hostname = NULL;
266 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
267 if(family != AF_UNSPEC && aip->ai_family != family) {
271 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
275 setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
279 set_timeout(s, 5000);
281 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
288 send(s, "GET ", 4, 0);
289 send(s, url, strlen(url), 0);
290 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
291 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
296 if(line[len - 1] == '\n') {
300 char *p = strrchr(line, '\n');
303 hostname = xstrdup(p + 1);
319 // Check that the hostname is reasonable
320 if(hostname && !is_valid_hostname(hostname)) {
326 meshlink_errno = MESHLINK_ERESOLV;
332 static bool is_localaddr(sockaddr_t *sa) {
333 switch(sa->sa.sa_family) {
335 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
338 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
339 return first == 0 || (first & 0xffc0) == 0xfe80;
347 #ifdef HAVE_GETIFADDRS
348 struct getifaddrs_in_netns_params {
349 struct ifaddrs **ifa;
354 static void *getifaddrs_in_netns_thread(void *arg) {
355 struct getifaddrs_in_netns_params *params = arg;
357 if(setns(params->netns, CLONE_NEWNET) == -1) {
358 meshlink_errno = MESHLINK_EINVAL;
362 if(getifaddrs(params->ifa) != 0) {
370 static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) {
372 return getifaddrs(ifa);
376 struct getifaddrs_in_netns_params params = {ifa, netns};
379 if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) {
380 if(pthread_join(thr, NULL) != 0) {
385 return *params.ifa ? 0 : -1;
393 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
395 meshlink_errno = MESHLINK_EINVAL;
399 // Determine address of the local interface used for outgoing connections.
400 char localaddr[NI_MAXHOST];
401 bool success = false;
403 if(family == AF_INET) {
404 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
405 } else if(family == AF_INET6) {
406 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
409 #ifdef HAVE_GETIFADDRS
412 struct ifaddrs *ifa = NULL;
413 getifaddrs_in_netns(&ifa, mesh->netns);
415 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
416 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
418 if(!sa || sa->sa.sa_family != family) {
422 if(is_localaddr(sa)) {
426 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
438 meshlink_errno = MESHLINK_ENETWORK;
442 return xstrdup(localaddr);
445 static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
446 for(int i = 0; i < n; i++) {
451 // Ignore duplicate hostnames
454 for(int j = 0; j < i; j++) {
459 if(strcmp(host[i], host[j])) {
463 if(strcmp(port[i], port[j])) {
471 if(found || !is_valid_hostname(host[i])) {
481 // This gets the hostname part for use in invitation URLs
482 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
483 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
485 char *hostname[count];
487 char *hostport = NULL;
489 memset(hostname, 0, sizeof(hostname));
490 memset(port, 0, sizeof(port));
492 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
493 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
496 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
497 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
500 // Add all explicitly set invitation addresses
501 if(mesh->invitation_addresses) {
502 for list_each(char, combo, mesh->invitation_addresses) {
503 hostname[n] = xstrdup(combo);
504 char *slash = strrchr(hostname[n], '/');
508 port[n] = xstrdup(slash + 1);
515 // Add local addresses if requested
516 if(flags & MESHLINK_INVITE_LOCAL) {
517 if(flags & MESHLINK_INVITE_IPV4) {
518 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
521 if(flags & MESHLINK_INVITE_IPV6) {
522 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
526 // Add public/canonical addresses if requested
527 if(flags & MESHLINK_INVITE_PUBLIC) {
528 // Try the CanonicalAddress first
529 get_canonical_address(mesh->self, &hostname[n], &port[n]);
531 if(!hostname[n] && count == 4) {
532 if(flags & MESHLINK_INVITE_IPV4) {
533 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
536 if(flags & MESHLINK_INVITE_IPV6) {
537 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
544 for(int i = 0; i < n; i++) {
545 // Ensure we always have a port number
546 if(hostname[i] && !port[i]) {
547 port[i] = xstrdup(mesh->myport);
551 remove_duplicate_hostnames(hostname, port, n);
553 // Resolve the hostnames
554 for(int i = 0; i < n; i++) {
559 // Convert what we have to a sockaddr
560 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5);
566 // Remember the address(es)
567 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
568 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
575 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
576 remove_duplicate_hostnames(hostname, port, n);
578 // Concatenate all unique address to the hostport string
579 for(int i = 0; i < n; i++) {
584 // Append the address to the hostport string
586 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
588 hostport = newhostport;
597 static bool try_bind(meshlink_handle_t *mesh, int port) {
598 struct addrinfo *ai = NULL;
599 struct addrinfo hint = {
600 .ai_flags = AI_PASSIVE,
601 .ai_family = AF_UNSPEC,
602 .ai_socktype = SOCK_STREAM,
603 .ai_protocol = IPPROTO_TCP,
607 snprintf(portstr, sizeof(portstr), "%d", port);
609 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
613 bool success = false;
615 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
616 /* Try to bind to TCP. */
618 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
621 if(errno == EADDRINUSE) {
622 /* If this port is in use for any address family, avoid it. */
630 /* If TCP worked, then we require that UDP works as well. */
632 int udp_fd = setup_udp_listen_socket(mesh, aip);
649 int check_port(meshlink_handle_t *mesh) {
650 for(int i = 0; i < 1000; i++) {
651 int port = 0x1000 + prng(mesh, 0x8000);
653 if(try_bind(mesh, port)) {
655 xasprintf(&mesh->myport, "%d", port);
660 meshlink_errno = MESHLINK_ENETWORK;
661 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
665 static bool write_main_config_files(meshlink_handle_t *mesh) {
666 if(!mesh->confbase) {
672 /* Write the main config file */
673 packmsg_output_t out = {buf, sizeof buf};
675 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
676 packmsg_add_str(&out, mesh->name);
677 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
678 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
679 packmsg_add_uint16(&out, atoi(mesh->myport));
681 if(!packmsg_output_ok(&out)) {
685 config_t config = {buf, packmsg_output_size(&out, buf)};
687 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
691 /* Write our own host config file */
692 if(!node_write_config(mesh, mesh->self)) {
700 meshlink_handle_t *mesh;
702 char cookie[18 + 32];
713 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
714 meshlink_handle_t *mesh = state->mesh;
715 packmsg_input_t in = {buf, len};
716 uint32_t version = packmsg_get_uint32(&in);
718 if(version != MESHLINK_INVITATION_VERSION) {
719 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
723 char *name = packmsg_get_str_dup(&in);
724 char *submesh_name = packmsg_get_str_dup(&in);
725 dev_class_t devclass = packmsg_get_int32(&in);
726 uint32_t count = packmsg_get_array(&in);
728 if(!name || !check_id(name)) {
729 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
735 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
736 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
743 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
750 free(mesh->self->name);
752 mesh->self->name = xstrdup(name);
753 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
755 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
757 // Initialize configuration directory
758 if(!config_init(mesh, "current")) {
762 if(!write_main_config_files(mesh)) {
766 // Write host config files
767 for(uint32_t i = 0; i < count; i++) {
769 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
772 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
776 packmsg_input_t in2 = {data, data_len};
777 uint32_t version2 = packmsg_get_uint32(&in2);
778 char *name2 = packmsg_get_str_dup(&in2);
780 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
782 packmsg_input_invalidate(&in);
786 if(!check_id(name2)) {
791 if(!strcmp(name2, mesh->name)) {
792 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
794 meshlink_errno = MESHLINK_EPEER;
798 node_t *n = new_node();
801 config_t config = {data, data_len};
803 if(!node_read_from_config(mesh, n, &config)) {
805 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
806 meshlink_errno = MESHLINK_EPEER;
811 /* The first host config file is of the inviter itself;
812 * remember the address we are currently using for the invitation connection.
815 socklen_t salen = sizeof(sa);
817 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
818 node_add_recent_address(mesh, n, &sa);
822 /* Clear the reachability times, since we ourself have never seen these nodes yet */
823 n->last_reachable = 0;
824 n->last_unreachable = 0;
826 if(!node_write_config(mesh, n)) {
834 /* Ensure the configuration directory metadata is on disk */
835 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
839 if(!mesh->inviter_commits_first) {
840 devtool_set_inviter_commits_first(false);
843 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
845 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
850 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
852 join_state_t *state = handle;
853 const char *ptr = data;
856 int result = send(state->sock, ptr, len, 0);
858 if(result == -1 && errno == EINTR) {
860 } else if(result <= 0) {
871 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
872 join_state_t *state = handle;
873 meshlink_handle_t *mesh = state->mesh;
875 if(mesh->inviter_commits_first) {
877 case SPTPS_HANDSHAKE:
878 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
884 if(!finalize_join(state, msg, len)) {
888 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
889 shutdown(state->sock, SHUT_RDWR);
890 state->success = true;
898 case SPTPS_HANDSHAKE:
899 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
902 return finalize_join(state, msg, len);
905 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
906 shutdown(state->sock, SHUT_RDWR);
907 state->success = true;
918 static bool recvline(join_state_t *state) {
919 char *newline = NULL;
921 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
922 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
924 if(result == -1 && errno == EINTR) {
926 } else if(result <= 0) {
930 state->blen += result;
933 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
937 size_t len = newline - state->buffer;
939 memcpy(state->line, state->buffer, len);
940 state->line[len] = 0;
941 memmove(state->buffer, newline + 1, state->blen - len - 1);
942 state->blen -= len + 1;
947 static bool sendline(int fd, const char *format, ...) {
953 va_start(ap, format);
954 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
957 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
965 int result = send(fd, p, blen, MSG_NOSIGNAL);
967 if(result == -1 && errno == EINTR) {
969 } else if(result <= 0) {
980 static const char *errstr[] = {
981 [MESHLINK_OK] = "No error",
982 [MESHLINK_EINVAL] = "Invalid argument",
983 [MESHLINK_ENOMEM] = "Out of memory",
984 [MESHLINK_ENOENT] = "No such node",
985 [MESHLINK_EEXIST] = "Node already exists",
986 [MESHLINK_EINTERNAL] = "Internal error",
987 [MESHLINK_ERESOLV] = "Could not resolve hostname",
988 [MESHLINK_ESTORAGE] = "Storage error",
989 [MESHLINK_ENETWORK] = "Network error",
990 [MESHLINK_EPEER] = "Error communicating with peer",
991 [MESHLINK_ENOTSUP] = "Operation not supported",
992 [MESHLINK_EBUSY] = "MeshLink instance already in use",
993 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
996 const char *meshlink_strerror(meshlink_errno_t err) {
997 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
998 return "Invalid error code";
1004 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
1005 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
1007 mesh->private_key = ecdsa_generate();
1008 mesh->invitation_key = ecdsa_generate();
1010 if(!mesh->private_key || !mesh->invitation_key) {
1011 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
1012 meshlink_errno = MESHLINK_EINTERNAL;
1016 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1021 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
1022 if(a->tv_sec == b->tv_sec) {
1023 return a->tv_nsec < b->tv_nsec;
1025 return a->tv_sec < b->tv_sec;
1029 static struct timespec idle(event_loop_t *loop, void *data) {
1031 meshlink_handle_t *mesh = data;
1032 struct timespec t, tmin = {3600, 0};
1034 for splay_each(node_t, n, mesh->nodes) {
1039 t = utcp_timeout(n->utcp);
1041 if(timespec_lt(&t, &tmin)) {
1049 // Get our local address(es) by simulating connecting to an Internet host.
1050 static void add_local_addresses(meshlink_handle_t *mesh) {
1052 sa.storage.ss_family = AF_UNKNOWN;
1053 socklen_t salen = sizeof(sa);
1057 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1058 sa.in.sin_port = ntohs(atoi(mesh->myport));
1059 node_add_recent_address(mesh, mesh->self, &sa);
1066 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1067 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1068 node_add_recent_address(mesh, mesh->self, &sa);
1072 static bool meshlink_setup(meshlink_handle_t *mesh) {
1073 if(!config_destroy(mesh->confbase, "new")) {
1074 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1075 meshlink_errno = MESHLINK_ESTORAGE;
1079 if(!config_destroy(mesh->confbase, "old")) {
1080 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1081 meshlink_errno = MESHLINK_ESTORAGE;
1085 if(!config_init(mesh, "current")) {
1086 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1087 meshlink_errno = MESHLINK_ESTORAGE;
1091 if(!ecdsa_keygen(mesh)) {
1092 meshlink_errno = MESHLINK_EINTERNAL;
1096 if(check_port(mesh) == 0) {
1097 meshlink_errno = MESHLINK_ENETWORK;
1101 /* Create a node for ourself */
1103 mesh->self = new_node();
1104 mesh->self->name = xstrdup(mesh->name);
1105 mesh->self->devclass = mesh->devclass;
1106 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1107 mesh->self->session_id = mesh->session_id;
1109 if(!write_main_config_files(mesh)) {
1110 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1111 meshlink_errno = MESHLINK_ESTORAGE;
1115 /* Ensure the configuration directory metadata is on disk */
1116 if(!config_sync(mesh, "current")) {
1123 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1126 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1127 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1131 packmsg_input_t in = {config.buf, config.len};
1132 const void *private_key;
1133 const void *invitation_key;
1135 uint32_t version = packmsg_get_uint32(&in);
1136 char *name = packmsg_get_str_dup(&in);
1137 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1138 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1139 uint16_t myport = packmsg_get_uint16(&in);
1141 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1142 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1144 config_free(&config);
1148 if(mesh->name && strcmp(mesh->name, name)) {
1149 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1150 meshlink_errno = MESHLINK_ESTORAGE;
1152 config_free(&config);
1158 xasprintf(&mesh->myport, "%u", myport);
1159 mesh->private_key = ecdsa_set_private_key(private_key);
1160 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1161 config_free(&config);
1163 /* Create a node for ourself and read our host configuration file */
1165 mesh->self = new_node();
1166 mesh->self->name = xstrdup(name);
1167 mesh->self->devclass = mesh->devclass;
1168 mesh->self->session_id = mesh->session_id;
1170 if(!node_read_public_key(mesh, mesh->self)) {
1171 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1172 meshlink_errno = MESHLINK_ESTORAGE;
1173 free_node(mesh->self);
1182 static void *setup_network_in_netns_thread(void *arg) {
1183 meshlink_handle_t *mesh = arg;
1185 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1189 bool success = setup_network(mesh);
1190 return success ? arg : NULL;
1192 #endif // HAVE_SETNS
1194 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1195 if(!confbase || !*confbase) {
1196 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1197 meshlink_errno = MESHLINK_EINVAL;
1201 if(!appname || !*appname) {
1202 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1203 meshlink_errno = MESHLINK_EINVAL;
1207 if(strchr(appname, ' ')) {
1208 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1209 meshlink_errno = MESHLINK_EINVAL;
1213 if(name && !check_id(name)) {
1214 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1215 meshlink_errno = MESHLINK_EINVAL;
1219 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1220 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1221 meshlink_errno = MESHLINK_EINVAL;
1225 meshlink_open_params_t *params = xzalloc(sizeof * params);
1227 params->confbase = xstrdup(confbase);
1228 params->name = name ? xstrdup(name) : NULL;
1229 params->appname = xstrdup(appname);
1230 params->devclass = devclass;
1236 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1238 meshlink_errno = MESHLINK_EINVAL;
1242 params->netns = netns;
1247 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1249 meshlink_errno = MESHLINK_EINVAL;
1253 if((!key && keylen) || (key && !keylen)) {
1254 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1255 meshlink_errno = MESHLINK_EINVAL;
1260 params->keylen = keylen;
1265 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1266 if(!mesh || !new_key || !new_keylen) {
1267 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1268 meshlink_errno = MESHLINK_EINVAL;
1272 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1276 // Create hash for the new key
1277 void *new_config_key;
1278 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1280 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1281 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1282 meshlink_errno = MESHLINK_EINTERNAL;
1283 pthread_mutex_unlock(&mesh->mutex);
1287 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1289 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1290 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1291 meshlink_errno = MESHLINK_ESTORAGE;
1292 pthread_mutex_unlock(&mesh->mutex);
1296 devtool_keyrotate_probe(1);
1298 // Rename confbase/current/ to confbase/old
1300 if(!config_rename(mesh, "current", "old")) {
1301 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1302 meshlink_errno = MESHLINK_ESTORAGE;
1303 pthread_mutex_unlock(&mesh->mutex);
1307 devtool_keyrotate_probe(2);
1309 // Rename confbase/new/ to confbase/current
1311 if(!config_rename(mesh, "new", "current")) {
1312 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1313 meshlink_errno = MESHLINK_ESTORAGE;
1314 pthread_mutex_unlock(&mesh->mutex);
1318 devtool_keyrotate_probe(3);
1320 // Cleanup the "old" confbase sub-directory
1322 if(!config_destroy(mesh->confbase, "old")) {
1323 pthread_mutex_unlock(&mesh->mutex);
1327 // Change the mesh handle key with new key
1329 free(mesh->config_key);
1330 mesh->config_key = new_config_key;
1332 pthread_mutex_unlock(&mesh->mutex);
1337 void meshlink_open_params_free(meshlink_open_params_t *params) {
1339 meshlink_errno = MESHLINK_EINVAL;
1343 free(params->confbase);
1345 free(params->appname);
1350 /// Device class traits
1351 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1352 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1353 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1354 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1355 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1358 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1359 if(!confbase || !*confbase) {
1360 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1361 meshlink_errno = MESHLINK_EINVAL;
1365 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1366 meshlink_open_params_t params;
1367 memset(¶ms, 0, sizeof(params));
1369 params.confbase = (char *)confbase;
1370 params.name = (char *)name;
1371 params.appname = (char *)appname;
1372 params.devclass = devclass;
1375 return meshlink_open_ex(¶ms);
1378 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) {
1379 if(!confbase || !*confbase) {
1380 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1381 meshlink_errno = MESHLINK_EINVAL;
1385 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1386 meshlink_open_params_t params;
1387 memset(¶ms, 0, sizeof(params));
1389 params.confbase = (char *)confbase;
1390 params.name = (char *)name;
1391 params.appname = (char *)appname;
1392 params.devclass = devclass;
1395 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1399 return meshlink_open_ex(¶ms);
1402 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1404 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1405 meshlink_errno = MESHLINK_EINVAL;
1409 if(!check_id(name)) {
1410 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1411 meshlink_errno = MESHLINK_EINVAL;
1415 if(!appname || !*appname) {
1416 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1417 meshlink_errno = MESHLINK_EINVAL;
1421 if(strchr(appname, ' ')) {
1422 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1423 meshlink_errno = MESHLINK_EINVAL;
1427 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1428 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1429 meshlink_errno = MESHLINK_EINVAL;
1433 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1434 meshlink_open_params_t params;
1435 memset(¶ms, 0, sizeof(params));
1437 params.name = (char *)name;
1438 params.appname = (char *)appname;
1439 params.devclass = devclass;
1442 return meshlink_open_ex(¶ms);
1445 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1446 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1448 // Validate arguments provided by the application
1449 if(!params->appname || !*params->appname) {
1450 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1451 meshlink_errno = MESHLINK_EINVAL;
1455 if(strchr(params->appname, ' ')) {
1456 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1457 meshlink_errno = MESHLINK_EINVAL;
1461 if(params->name && !check_id(params->name)) {
1462 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1463 meshlink_errno = MESHLINK_EINVAL;
1467 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1468 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1469 meshlink_errno = MESHLINK_EINVAL;
1473 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1474 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1475 meshlink_errno = MESHLINK_EINVAL;
1479 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1481 if(params->confbase) {
1482 mesh->confbase = xstrdup(params->confbase);
1485 mesh->appname = xstrdup(params->appname);
1486 mesh->devclass = params->devclass;
1487 mesh->discovery = true;
1488 mesh->invitation_timeout = 604800; // 1 week
1489 mesh->netns = params->netns;
1490 mesh->submeshes = NULL;
1491 mesh->log_cb = global_log_cb;
1492 mesh->log_level = global_log_level;
1493 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1495 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1498 randomize(&mesh->session_id, sizeof(mesh->session_id));
1499 } while(mesh->session_id == 0);
1501 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1503 mesh->name = params->name ? xstrdup(params->name) : NULL;
1507 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1509 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1510 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1511 meshlink_close(mesh);
1512 meshlink_errno = MESHLINK_EINTERNAL;
1517 // initialize mutexes and conds
1518 pthread_mutexattr_t attr;
1519 pthread_mutexattr_init(&attr);
1521 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1525 pthread_mutex_init(&mesh->mutex, &attr);
1526 pthread_cond_init(&mesh->cond, NULL);
1528 pthread_mutex_init(&mesh->discovery_mutex, NULL);
1529 pthread_cond_init(&mesh->discovery_cond, NULL);
1531 pthread_cond_init(&mesh->adns_cond, NULL);
1533 mesh->threadstarted = false;
1534 event_loop_init(&mesh->loop);
1535 mesh->loop.data = mesh;
1537 meshlink_queue_init(&mesh->outpacketqueue);
1539 // Atomically lock the configuration directory.
1540 if(!main_config_lock(mesh)) {
1541 meshlink_close(mesh);
1545 // If no configuration exists yet, create it.
1547 if(!meshlink_confbase_exists(mesh)) {
1549 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1550 meshlink_close(mesh);
1551 meshlink_errno = MESHLINK_ESTORAGE;
1555 if(!meshlink_setup(mesh)) {
1556 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1557 meshlink_close(mesh);
1561 if(!meshlink_read_config(mesh)) {
1562 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1563 meshlink_close(mesh);
1569 struct WSAData wsa_state;
1570 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1573 // Setup up everything
1574 // TODO: we should not open listening sockets yet
1576 bool success = false;
1578 if(mesh->netns != -1) {
1582 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1583 void *retval = NULL;
1584 success = pthread_join(thr, &retval) == 0 && retval;
1588 meshlink_errno = MESHLINK_EINTERNAL;
1591 #endif // HAVE_SETNS
1593 success = setup_network(mesh);
1597 meshlink_close(mesh);
1598 meshlink_errno = MESHLINK_ENETWORK;
1602 add_local_addresses(mesh);
1604 if(!node_write_config(mesh, mesh->self)) {
1605 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1609 idle_set(&mesh->loop, idle, mesh);
1611 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1615 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1616 meshlink_submesh_t *s = NULL;
1619 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1620 meshlink_errno = MESHLINK_EINVAL;
1624 if(!submesh || !*submesh) {
1625 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1626 meshlink_errno = MESHLINK_EINVAL;
1631 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1635 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1637 pthread_mutex_unlock(&mesh->mutex);
1642 static void *meshlink_main_loop(void *arg) {
1643 meshlink_handle_t *mesh = arg;
1645 if(mesh->netns != -1) {
1648 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1649 pthread_cond_signal(&mesh->cond);
1654 pthread_cond_signal(&mesh->cond);
1656 #endif // HAVE_SETNS
1661 if(mesh->discovery) {
1662 discovery_start(mesh);
1667 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1671 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1672 pthread_cond_broadcast(&mesh->cond);
1674 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1676 pthread_mutex_unlock(&mesh->mutex);
1681 if(mesh->discovery) {
1682 discovery_stop(mesh);
1690 bool meshlink_start(meshlink_handle_t *mesh) {
1692 meshlink_errno = MESHLINK_EINVAL;
1696 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1698 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1703 assert(mesh->private_key);
1704 assert(mesh->self->ecdsa);
1705 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1707 if(mesh->threadstarted) {
1708 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1709 pthread_mutex_unlock(&mesh->mutex);
1713 if(mesh->listen_socket[0].tcp.fd < 0) {
1714 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1715 meshlink_errno = MESHLINK_ENETWORK;
1719 // Reset node connection timers
1720 for splay_each(node_t, n, mesh->nodes) {
1721 n->last_connect_try = 0;
1724 // TODO: open listening sockets first
1726 //Check that a valid name is set
1728 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1729 meshlink_errno = MESHLINK_EINVAL;
1730 pthread_mutex_unlock(&mesh->mutex);
1734 init_outgoings(mesh);
1737 // Start the main thread
1739 event_loop_start(&mesh->loop);
1741 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1742 pthread_attr_t attr;
1743 pthread_attr_init(&attr);
1744 pthread_attr_setstacksize(&attr, 1024 * 1024);
1746 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1747 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1748 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1749 meshlink_errno = MESHLINK_EINTERNAL;
1750 event_loop_stop(&mesh->loop);
1751 pthread_mutex_unlock(&mesh->mutex);
1755 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1756 mesh->threadstarted = true;
1758 // Ensure we are considered reachable
1761 pthread_mutex_unlock(&mesh->mutex);
1765 void meshlink_stop(meshlink_handle_t *mesh) {
1767 meshlink_errno = MESHLINK_EINVAL;
1771 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1775 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1777 // Shut down the main thread
1778 event_loop_stop(&mesh->loop);
1780 // Send ourselves a UDP packet to kick the event loop
1781 for(int i = 0; i < mesh->listen_sockets; i++) {
1783 socklen_t salen = sizeof(sa);
1785 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1786 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1790 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1791 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1795 if(mesh->threadstarted) {
1796 // Wait for the main thread to finish
1797 pthread_mutex_unlock(&mesh->mutex);
1799 if(pthread_join(mesh->thread, NULL) != 0) {
1803 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1807 mesh->threadstarted = false;
1810 // Close all metaconnections
1811 if(mesh->connections) {
1812 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1814 connection_t *c = node->data;
1816 terminate_connection(mesh, c, false);
1821 exit_outgoings(mesh);
1823 // Ensure we are considered unreachable
1828 // Try to write out any changed node config files, ignore errors at this point.
1830 for splay_each(node_t, n, mesh->nodes) {
1831 if(n->status.dirty) {
1832 n->status.dirty = !node_write_config(mesh, n);
1837 pthread_mutex_unlock(&mesh->mutex);
1840 void meshlink_close(meshlink_handle_t *mesh) {
1842 meshlink_errno = MESHLINK_EINVAL;
1846 // stop can be called even if mesh has not been started
1847 meshlink_stop(mesh);
1849 // lock is not released after this
1850 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1854 // Close and free all resources used.
1856 close_network_connections(mesh);
1858 logger(mesh, MESHLINK_INFO, "Terminating");
1860 event_loop_exit(&mesh->loop);
1864 if(mesh->confbase) {
1870 ecdsa_free(mesh->invitation_key);
1872 if(mesh->netns != -1) {
1876 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1880 meshlink_queue_exit(&mesh->outpacketqueue);
1883 free(mesh->appname);
1884 free(mesh->confbase);
1885 free(mesh->config_key);
1886 free(mesh->external_address_url);
1888 ecdsa_free(mesh->private_key);
1890 if(mesh->invitation_addresses) {
1891 list_delete_list(mesh->invitation_addresses);
1894 main_config_unlock(mesh);
1896 pthread_mutex_unlock(&mesh->mutex);
1897 pthread_mutex_destroy(&mesh->mutex);
1899 memset(mesh, 0, sizeof(*mesh));
1904 bool meshlink_destroy(const char *confbase) {
1906 meshlink_errno = MESHLINK_EINVAL;
1910 /* Exit early if the confbase directory itself doesn't exist */
1911 if(access(confbase, F_OK) && errno == ENOENT) {
1915 /* Take the lock the same way meshlink_open() would. */
1916 char lockfilename[PATH_MAX];
1917 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1919 FILE *lockfile = fopen(lockfilename, "w+");
1922 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1923 meshlink_errno = MESHLINK_ESTORAGE;
1928 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1932 // TODO: use _locking()?
1935 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1936 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1938 meshlink_errno = MESHLINK_EBUSY;
1944 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1945 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1949 if(unlink(lockfilename)) {
1950 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1952 meshlink_errno = MESHLINK_ESTORAGE;
1958 if(!sync_path(confbase)) {
1959 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1960 meshlink_errno = MESHLINK_ESTORAGE;
1967 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1969 meshlink_errno = MESHLINK_EINVAL;
1973 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1977 mesh->receive_cb = cb;
1978 pthread_mutex_unlock(&mesh->mutex);
1981 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1983 meshlink_errno = MESHLINK_EINVAL;
1987 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1991 mesh->connection_try_cb = cb;
1992 pthread_mutex_unlock(&mesh->mutex);
1995 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1997 meshlink_errno = MESHLINK_EINVAL;
2001 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2005 mesh->node_status_cb = cb;
2006 pthread_mutex_unlock(&mesh->mutex);
2009 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
2011 meshlink_errno = MESHLINK_EINVAL;
2015 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2019 mesh->node_pmtu_cb = cb;
2020 pthread_mutex_unlock(&mesh->mutex);
2023 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
2025 meshlink_errno = MESHLINK_EINVAL;
2029 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2033 mesh->node_duplicate_cb = cb;
2034 pthread_mutex_unlock(&mesh->mutex);
2037 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
2039 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2044 mesh->log_level = cb ? level : 0;
2045 pthread_mutex_unlock(&mesh->mutex);
2048 global_log_level = cb ? level : 0;
2052 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2054 meshlink_errno = MESHLINK_EINVAL;
2058 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2062 mesh->error_cb = cb;
2063 pthread_mutex_unlock(&mesh->mutex);
2066 void meshlink_set_blacklisted_cb(struct meshlink_handle *mesh, meshlink_blacklisted_cb_t cb) {
2068 meshlink_errno = MESHLINK_EINVAL;
2072 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2076 mesh->blacklisted_cb = cb;
2077 pthread_mutex_unlock(&mesh->mutex);
2080 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2081 meshlink_packethdr_t *hdr;
2083 if(len > MAXSIZE - sizeof(*hdr)) {
2084 meshlink_errno = MESHLINK_EINVAL;
2088 node_t *n = (node_t *)destination;
2090 if(n->status.blacklisted) {
2091 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2092 meshlink_errno = MESHLINK_EBLACKLISTED;
2096 // Prepare the packet
2097 packet->probe = false;
2098 packet->tcp = false;
2099 packet->len = len + sizeof(*hdr);
2101 hdr = (meshlink_packethdr_t *)packet->data;
2102 memset(hdr, 0, sizeof(*hdr));
2103 // leave the last byte as 0 to make sure strings are always
2104 // null-terminated if they are longer than the buffer
2105 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2106 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2108 memcpy(packet->data + sizeof(*hdr), data, len);
2113 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2115 assert(destination);
2119 // Prepare the packet
2120 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2124 // Send it immediately
2125 route(mesh, mesh->self, mesh->packet);
2130 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2131 // Validate arguments
2132 if(!mesh || !destination) {
2133 meshlink_errno = MESHLINK_EINVAL;
2142 meshlink_errno = MESHLINK_EINVAL;
2146 // Prepare the packet
2147 vpn_packet_t *packet = malloc(sizeof(*packet));
2150 meshlink_errno = MESHLINK_ENOMEM;
2154 if(!prepare_packet(mesh, destination, data, len, packet)) {
2160 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2162 meshlink_errno = MESHLINK_ENOMEM;
2166 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2168 // Notify event loop
2169 signal_trigger(&mesh->loop, &mesh->datafromapp);
2174 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2176 meshlink_handle_t *mesh = data;
2178 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2180 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2181 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2182 mesh->self->in_packets++;
2183 mesh->self->in_bytes += packet->len;
2184 route(mesh, mesh->self, packet);
2189 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2190 if(!mesh || !destination) {
2191 meshlink_errno = MESHLINK_EINVAL;
2195 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2199 node_t *n = (node_t *)destination;
2201 if(!n->status.reachable) {
2202 pthread_mutex_unlock(&mesh->mutex);
2205 } else if(n->mtuprobes > 30 && n->minmtu) {
2206 pthread_mutex_unlock(&mesh->mutex);
2209 pthread_mutex_unlock(&mesh->mutex);
2214 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2215 if(!mesh || !node) {
2216 meshlink_errno = MESHLINK_EINVAL;
2220 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2224 node_t *n = (node_t *)node;
2226 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2227 meshlink_errno = MESHLINK_EINTERNAL;
2228 pthread_mutex_unlock(&mesh->mutex);
2232 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2235 meshlink_errno = MESHLINK_EINTERNAL;
2238 pthread_mutex_unlock(&mesh->mutex);
2242 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2244 meshlink_errno = MESHLINK_EINVAL;
2248 return (meshlink_node_t *)mesh->self;
2251 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2252 if(!mesh || !name) {
2253 meshlink_errno = MESHLINK_EINVAL;
2259 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2263 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2264 pthread_mutex_unlock(&mesh->mutex);
2267 meshlink_errno = MESHLINK_ENOENT;
2270 return (meshlink_node_t *)n;
2273 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2274 if(!mesh || !name) {
2275 meshlink_errno = MESHLINK_EINVAL;
2279 meshlink_submesh_t *submesh = NULL;
2281 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2285 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2286 pthread_mutex_unlock(&mesh->mutex);
2289 meshlink_errno = MESHLINK_ENOENT;
2295 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2296 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2297 meshlink_errno = MESHLINK_EINVAL;
2301 meshlink_node_t **result;
2304 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2308 *nmemb = mesh->nodes->count;
2309 result = realloc(nodes, *nmemb * sizeof(*nodes));
2312 meshlink_node_t **p = result;
2314 for splay_each(node_t, n, mesh->nodes) {
2315 *p++ = (meshlink_node_t *)n;
2320 meshlink_errno = MESHLINK_ENOMEM;
2323 pthread_mutex_unlock(&mesh->mutex);
2328 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) {
2329 meshlink_node_t **result;
2331 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2337 for splay_each(node_t, n, mesh->nodes) {
2338 if(search_node(n, condition)) {
2345 pthread_mutex_unlock(&mesh->mutex);
2349 result = realloc(nodes, *nmemb * sizeof(*nodes));
2352 meshlink_node_t **p = result;
2354 for splay_each(node_t, n, mesh->nodes) {
2355 if(search_node(n, condition)) {
2356 *p++ = (meshlink_node_t *)n;
2362 meshlink_errno = MESHLINK_ENOMEM;
2365 pthread_mutex_unlock(&mesh->mutex);
2370 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2371 dev_class_t *devclass = (dev_class_t *)condition;
2373 if(*devclass == (dev_class_t)node->devclass) {
2380 static bool search_node_by_blacklisted(const node_t *node, const void *condition) {
2381 return *(bool *)condition == node->status.blacklisted;
2384 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2385 if(condition == node->submesh) {
2397 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2398 const struct time_range *range = condition;
2399 time_t start = node->last_reachable;
2400 time_t end = node->last_unreachable;
2410 if(range->end >= range->start) {
2411 return start <= range->end && end >= range->start;
2413 return start > range->start || end < range->end;
2417 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) {
2418 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2419 meshlink_errno = MESHLINK_EINVAL;
2423 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2426 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2427 if(!mesh || !submesh || !nmemb) {
2428 meshlink_errno = MESHLINK_EINVAL;
2432 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2435 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) {
2436 if(!mesh || !nmemb) {
2437 meshlink_errno = MESHLINK_EINVAL;
2441 struct time_range range = {start, end};
2443 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2446 meshlink_node_t **meshlink_get_all_nodes_by_blacklisted(meshlink_handle_t *mesh, bool blacklisted, meshlink_node_t **nodes, size_t *nmemb) {
2447 if(!mesh || !nmemb) {
2448 meshlink_errno = MESHLINK_EINVAL;
2452 return meshlink_get_all_nodes_by_condition(mesh, &blacklisted, nodes, nmemb, search_node_by_blacklisted);
2455 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2456 if(!mesh || !node) {
2457 meshlink_errno = MESHLINK_EINVAL;
2461 dev_class_t devclass;
2463 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2467 devclass = ((node_t *)node)->devclass;
2469 pthread_mutex_unlock(&mesh->mutex);
2474 bool meshlink_get_node_blacklisted(meshlink_handle_t *mesh, meshlink_node_t *node) {
2476 meshlink_errno = MESHLINK_EINVAL;
2480 return mesh->default_blacklist;
2485 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2489 blacklisted = ((node_t *)node)->status.blacklisted;
2491 pthread_mutex_unlock(&mesh->mutex);
2496 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2497 if(!mesh || !node) {
2498 meshlink_errno = MESHLINK_EINVAL;
2502 node_t *n = (node_t *)node;
2504 meshlink_submesh_t *s;
2506 s = (meshlink_submesh_t *)n->submesh;
2511 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2512 if(!mesh || !node) {
2513 meshlink_errno = MESHLINK_EINVAL;
2517 node_t *n = (node_t *)node;
2520 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2524 reachable = n->status.reachable && !n->status.blacklisted;
2526 if(last_reachable) {
2527 *last_reachable = n->last_reachable;
2530 if(last_unreachable) {
2531 *last_unreachable = n->last_unreachable;
2534 pthread_mutex_unlock(&mesh->mutex);
2539 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2540 if(!mesh || !data || !len || !signature || !siglen) {
2541 meshlink_errno = MESHLINK_EINVAL;
2545 if(*siglen < MESHLINK_SIGLEN) {
2546 meshlink_errno = MESHLINK_EINVAL;
2550 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2554 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2555 meshlink_errno = MESHLINK_EINTERNAL;
2556 pthread_mutex_unlock(&mesh->mutex);
2560 *siglen = MESHLINK_SIGLEN;
2561 pthread_mutex_unlock(&mesh->mutex);
2565 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2566 if(!mesh || !source || !data || !len || !signature) {
2567 meshlink_errno = MESHLINK_EINVAL;
2571 if(siglen != MESHLINK_SIGLEN) {
2572 meshlink_errno = MESHLINK_EINVAL;
2576 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2582 struct node_t *n = (struct node_t *)source;
2584 if(!node_read_public_key(mesh, n)) {
2585 meshlink_errno = MESHLINK_EINTERNAL;
2588 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2591 pthread_mutex_unlock(&mesh->mutex);
2595 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2596 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2600 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2603 // TODO: Update invitation key if necessary?
2606 pthread_mutex_unlock(&mesh->mutex);
2608 return mesh->invitation_key;
2611 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2612 if(!mesh || !node || !address) {
2613 meshlink_errno = MESHLINK_EINVAL;
2617 if(!is_valid_hostname(address)) {
2618 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2619 meshlink_errno = MESHLINK_EINVAL;
2623 if((node_t *)node != mesh->self && !port) {
2624 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2625 meshlink_errno = MESHLINK_EINVAL;
2630 if(port && !is_valid_port(port)) {
2631 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2632 meshlink_errno = MESHLINK_EINVAL;
2636 char *canonical_address;
2638 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2640 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2644 node_t *n = (node_t *)node;
2645 free(n->canonical_address);
2646 n->canonical_address = canonical_address;
2648 if(!node_write_config(mesh, n)) {
2649 pthread_mutex_unlock(&mesh->mutex);
2653 pthread_mutex_unlock(&mesh->mutex);
2655 return config_sync(mesh, "current");
2658 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2659 if(!mesh || !node) {
2660 meshlink_errno = MESHLINK_EINVAL;
2664 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2668 node_t *n = (node_t *)node;
2669 free(n->canonical_address);
2670 n->canonical_address = NULL;
2672 if(!node_write_config(mesh, n)) {
2673 pthread_mutex_unlock(&mesh->mutex);
2677 pthread_mutex_unlock(&mesh->mutex);
2679 return config_sync(mesh, "current");
2682 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2683 if(!mesh || !address) {
2684 meshlink_errno = MESHLINK_EINVAL;
2688 if(!is_valid_hostname(address)) {
2689 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2690 meshlink_errno = MESHLINK_EINVAL;
2694 if(port && !is_valid_port(port)) {
2695 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2696 meshlink_errno = MESHLINK_EINVAL;
2703 xasprintf(&combo, "%s/%s", address, port);
2705 combo = xstrdup(address);
2708 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2712 if(!mesh->invitation_addresses) {
2713 mesh->invitation_addresses = list_alloc((list_action_t)free);
2716 list_insert_tail(mesh->invitation_addresses, combo);
2717 pthread_mutex_unlock(&mesh->mutex);
2722 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2724 meshlink_errno = MESHLINK_EINVAL;
2728 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2732 if(mesh->invitation_addresses) {
2733 list_delete_list(mesh->invitation_addresses);
2734 mesh->invitation_addresses = NULL;
2737 pthread_mutex_unlock(&mesh->mutex);
2740 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2741 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2744 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2746 meshlink_errno = MESHLINK_EINVAL;
2750 char *address = meshlink_get_external_address(mesh);
2756 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2762 int meshlink_get_port(meshlink_handle_t *mesh) {
2764 meshlink_errno = MESHLINK_EINVAL;
2769 meshlink_errno = MESHLINK_EINTERNAL;
2775 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2779 port = atoi(mesh->myport);
2780 pthread_mutex_unlock(&mesh->mutex);
2785 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2786 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2787 meshlink_errno = MESHLINK_EINVAL;
2791 if(mesh->myport && port == atoi(mesh->myport)) {
2795 if(!try_bind(mesh, port)) {
2796 meshlink_errno = MESHLINK_ENETWORK;
2800 devtool_trybind_probe();
2804 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2808 if(mesh->threadstarted) {
2809 meshlink_errno = MESHLINK_EINVAL;
2814 xasprintf(&mesh->myport, "%d", port);
2816 /* Close down the network. This also deletes mesh->self. */
2817 close_network_connections(mesh);
2819 /* Recreate mesh->self. */
2820 mesh->self = new_node();
2821 mesh->self->name = xstrdup(mesh->name);
2822 mesh->self->devclass = mesh->devclass;
2823 mesh->self->session_id = mesh->session_id;
2824 xasprintf(&mesh->myport, "%d", port);
2826 if(!node_read_public_key(mesh, mesh->self)) {
2827 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2828 meshlink_errno = MESHLINK_ESTORAGE;
2829 free_node(mesh->self);
2832 } else if(!setup_network(mesh)) {
2833 meshlink_errno = MESHLINK_ENETWORK;
2837 /* Rebuild our own list of recent addresses */
2838 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2839 add_local_addresses(mesh);
2841 /* Write meshlink.conf with the updated port number */
2842 write_main_config_files(mesh);
2844 rval = config_sync(mesh, "current");
2847 pthread_mutex_unlock(&mesh->mutex);
2849 return rval && meshlink_get_port(mesh) == port;
2852 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2853 mesh->invitation_timeout = timeout;
2856 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2857 meshlink_submesh_t *s = NULL;
2860 meshlink_errno = MESHLINK_EINVAL;
2865 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2868 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2869 meshlink_errno = MESHLINK_EINVAL;
2873 s = (meshlink_submesh_t *)mesh->self->submesh;
2876 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2880 // Check validity of the new node's name
2881 if(!check_id(name)) {
2882 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2883 meshlink_errno = MESHLINK_EINVAL;
2884 pthread_mutex_unlock(&mesh->mutex);
2888 // Ensure no host configuration file with that name exists
2889 if(config_exists(mesh, "current", name)) {
2890 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2891 meshlink_errno = MESHLINK_EEXIST;
2892 pthread_mutex_unlock(&mesh->mutex);
2896 // Ensure no other nodes know about this name
2897 if(lookup_node(mesh, name)) {
2898 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2899 meshlink_errno = MESHLINK_EEXIST;
2900 pthread_mutex_unlock(&mesh->mutex);
2904 // Get the local address
2905 char *address = get_my_hostname(mesh, flags);
2908 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2909 meshlink_errno = MESHLINK_ERESOLV;
2910 pthread_mutex_unlock(&mesh->mutex);
2914 if(!refresh_invitation_key(mesh)) {
2915 meshlink_errno = MESHLINK_EINTERNAL;
2916 pthread_mutex_unlock(&mesh->mutex);
2920 // If we changed our own host config file, write it out now
2921 if(mesh->self->status.dirty) {
2922 if(!node_write_config(mesh, mesh->self)) {
2923 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2924 pthread_mutex_unlock(&mesh->mutex);
2931 // Create a hash of the key.
2932 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2933 sha512(fingerprint, strlen(fingerprint), hash);
2934 b64encode_urlsafe(hash, hash, 18);
2936 // Create a random cookie for this invitation.
2938 randomize(cookie, 18);
2940 // Create a filename that doesn't reveal the cookie itself
2941 char buf[18 + strlen(fingerprint)];
2942 char cookiehash[64];
2943 memcpy(buf, cookie, 18);
2944 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2945 sha512(buf, sizeof(buf), cookiehash);
2946 b64encode_urlsafe(cookiehash, cookiehash, 18);
2948 b64encode_urlsafe(cookie, cookie, 18);
2952 /* Construct the invitation file */
2953 uint8_t outbuf[4096];
2954 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2956 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2957 packmsg_add_str(&inv, name);
2958 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2959 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2961 /* TODO: Add several host config files to bootstrap connections.
2962 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2963 * and are not blacklisted.
2965 config_t configs[5];
2966 memset(configs, 0, sizeof(configs));
2969 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2973 /* Append host config files to the invitation file */
2974 packmsg_add_array(&inv, count);
2976 for(int i = 0; i < count; i++) {
2977 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2978 config_free(&configs[i]);
2981 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2983 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2984 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2985 meshlink_errno = MESHLINK_ESTORAGE;
2986 pthread_mutex_unlock(&mesh->mutex);
2990 // Create an URL from the local address, key hash and cookie
2992 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2995 pthread_mutex_unlock(&mesh->mutex);
2999 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
3000 return meshlink_invite_ex(mesh, submesh, name, 0);
3003 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
3004 if(!mesh || !invitation) {
3005 meshlink_errno = MESHLINK_EINVAL;
3009 join_state_t state = {
3014 ecdsa_t *key = NULL;
3015 ecdsa_t *hiskey = NULL;
3017 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
3018 char copy[strlen(invitation) + 1];
3020 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3024 //Before doing meshlink_join make sure we are not connected to another mesh
3025 if(mesh->threadstarted) {
3026 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
3027 meshlink_errno = MESHLINK_EINVAL;
3031 // 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.
3032 if(mesh->nodes->count > 1) {
3033 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
3034 meshlink_errno = MESHLINK_EINVAL;
3038 strcpy(copy, invitation);
3040 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
3042 char *slash = strchr(copy, '/');
3050 if(strlen(slash) != 48) {
3054 char *address = copy;
3057 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
3061 if(mesh->inviter_commits_first) {
3062 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
3065 // Generate a throw-away key for the invitation.
3066 key = ecdsa_generate();
3069 meshlink_errno = MESHLINK_EINTERNAL;
3073 char *b64key = ecdsa_get_base64_public_key(key);
3076 while(address && *address) {
3077 // We allow commas in the address part to support multiple addresses in one invitation URL.
3078 comma = strchr(address, ',');
3084 // Split of the port
3085 port = strrchr(address, ':');
3093 // IPv6 address are enclosed in brackets, per RFC 3986
3094 if(*address == '[') {
3096 char *bracket = strchr(address, ']');
3109 // Connect to the meshlink daemon mentioned in the URL.
3110 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 5);
3113 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
3114 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
3116 if(state.sock == -1) {
3117 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
3118 meshlink_errno = MESHLINK_ENETWORK;
3124 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3127 set_timeout(state.sock, 5000);
3129 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3130 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3131 meshlink_errno = MESHLINK_ENETWORK;
3132 closesocket(state.sock);
3142 meshlink_errno = MESHLINK_ERESOLV;
3145 if(state.sock != -1 || !comma) {
3152 if(state.sock == -1) {
3156 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3158 // Tell him we have an invitation, and give him our throw-away key.
3162 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3163 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3164 meshlink_errno = MESHLINK_ENETWORK;
3170 char hisname[4096] = "";
3171 int code, hismajor, hisminor = 0;
3173 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) {
3174 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
3175 meshlink_errno = MESHLINK_ENETWORK;
3179 // Check if the hash of the key he gave us matches the hash in the URL.
3180 char *fingerprint = state.line + 2;
3183 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3184 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
3185 meshlink_errno = MESHLINK_EINTERNAL;
3189 if(memcmp(hishash, state.hash, 18)) {
3190 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
3191 meshlink_errno = MESHLINK_EPEER;
3195 hiskey = ecdsa_set_base64_public_key(fingerprint);
3198 meshlink_errno = MESHLINK_EINTERNAL;
3202 // Start an SPTPS session
3203 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3204 meshlink_errno = MESHLINK_EINTERNAL;
3208 // Feed rest of input buffer to SPTPS
3209 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3210 meshlink_errno = MESHLINK_EPEER;
3215 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3217 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3219 if(errno == EINTR) {
3223 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3224 meshlink_errno = MESHLINK_ENETWORK;
3228 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3229 meshlink_errno = MESHLINK_EPEER;
3234 if(!state.success) {
3235 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3236 meshlink_errno = MESHLINK_EPEER;
3240 sptps_stop(&state.sptps);
3243 closesocket(state.sock);
3245 pthread_mutex_unlock(&mesh->mutex);
3249 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3250 meshlink_errno = MESHLINK_EINVAL;
3252 sptps_stop(&state.sptps);
3256 if(state.sock != -1) {
3257 closesocket(state.sock);
3260 pthread_mutex_unlock(&mesh->mutex);
3264 char *meshlink_export(meshlink_handle_t *mesh) {
3266 meshlink_errno = MESHLINK_EINVAL;
3270 // Create a config file on the fly.
3273 packmsg_output_t out = {buf, sizeof(buf)};
3274 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3275 packmsg_add_str(&out, mesh->name);
3276 packmsg_add_str(&out, CORE_MESH);
3278 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3282 packmsg_add_int32(&out, mesh->self->devclass);
3283 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3284 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3286 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3287 char *canonical_address = NULL;
3288 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3289 packmsg_add_str(&out, canonical_address);
3290 free(canonical_address);
3292 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3297 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3298 if(mesh->self->recent[i].sa.sa_family) {
3305 packmsg_add_array(&out, count);
3307 for(uint32_t i = 0; i < count; i++) {
3308 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3311 packmsg_add_int64(&out, 0);
3312 packmsg_add_int64(&out, 0);
3314 pthread_mutex_unlock(&mesh->mutex);
3316 if(!packmsg_output_ok(&out)) {
3317 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3318 meshlink_errno = MESHLINK_EINTERNAL;
3322 // Prepare a base64-encoded packmsg array containing our config file
3324 uint32_t len = packmsg_output_size(&out, buf);
3325 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3326 uint8_t *buf2 = xmalloc(len2);
3327 packmsg_output_t out2 = {buf2, len2};
3328 packmsg_add_array(&out2, 1);
3329 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3331 if(!packmsg_output_ok(&out2)) {
3332 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3333 meshlink_errno = MESHLINK_EINTERNAL;
3338 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3340 return (char *)buf2;
3343 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3344 if(!mesh || !data) {
3345 meshlink_errno = MESHLINK_EINVAL;
3349 size_t datalen = strlen(data);
3350 uint8_t *buf = xmalloc(datalen);
3351 int buflen = b64decode(data, buf, datalen);
3354 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3355 meshlink_errno = MESHLINK_EPEER;
3359 packmsg_input_t in = {buf, buflen};
3360 uint32_t count = packmsg_get_array(&in);
3363 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3364 meshlink_errno = MESHLINK_EPEER;
3368 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3374 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3380 packmsg_input_t in2 = {data2, len2};
3381 uint32_t version = packmsg_get_uint32(&in2);
3382 char *name = packmsg_get_str_dup(&in2);
3384 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3386 packmsg_input_invalidate(&in);
3390 if(!check_id(name)) {
3395 node_t *n = lookup_node(mesh, name);
3398 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3406 config_t config = {data2, len2};
3408 if(!node_read_from_config(mesh, n, &config)) {
3410 packmsg_input_invalidate(&in);
3414 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3415 n->last_reachable = 0;
3416 n->last_unreachable = 0;
3418 if(!node_write_config(mesh, n)) {
3426 pthread_mutex_unlock(&mesh->mutex);
3430 if(!packmsg_done(&in)) {
3431 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3432 meshlink_errno = MESHLINK_EPEER;
3436 if(!config_sync(mesh, "current")) {
3443 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3444 if(n == mesh->self) {
3445 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3446 meshlink_errno = MESHLINK_EINVAL;
3450 if(n->status.blacklisted) {
3451 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3455 n->status.blacklisted = true;
3457 /* Immediately shut down any connections we have with the blacklisted node.
3458 * We can't call terminate_connection(), because we might be called from a callback function.
3460 for list_each(connection_t, c, mesh->connections) {
3462 if(c->status.active) {
3463 send_error(mesh, c, BLACKLISTED, "blacklisted");
3466 shutdown(c->socket, SHUT_RDWR);
3470 utcp_abort_all_connections(n->utcp);
3476 n->status.udp_confirmed = false;
3478 if(n->status.reachable) {
3479 n->last_unreachable = time(NULL);
3482 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3483 * manually call the status callback if necessary.
3485 if(n->status.reachable && mesh->node_status_cb) {
3486 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3489 /* Remove any outstanding invitations */
3490 invitation_purge_node(mesh, n->name);
3492 return node_write_config(mesh, n) && config_sync(mesh, "current");
3495 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3496 if(!mesh || !node) {
3497 meshlink_errno = MESHLINK_EINVAL;
3501 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3505 if(!blacklist(mesh, (node_t *)node)) {
3506 pthread_mutex_unlock(&mesh->mutex);
3510 pthread_mutex_unlock(&mesh->mutex);
3512 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3516 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3517 if(!mesh || !name) {
3518 meshlink_errno = MESHLINK_EINVAL;
3522 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3526 node_t *n = lookup_node(mesh, (char *)name);
3530 n->name = xstrdup(name);
3534 if(!blacklist(mesh, (node_t *)n)) {
3535 pthread_mutex_unlock(&mesh->mutex);
3539 pthread_mutex_unlock(&mesh->mutex);
3541 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3545 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3546 if(n == mesh->self) {
3547 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3548 meshlink_errno = MESHLINK_EINVAL;
3552 if(!n->status.blacklisted) {
3553 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3557 n->status.blacklisted = false;
3559 if(n->status.reachable) {
3560 n->last_reachable = time(NULL);
3561 update_node_status(mesh, n);
3564 return node_write_config(mesh, n) && config_sync(mesh, "current");
3567 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3568 if(!mesh || !node) {
3569 meshlink_errno = MESHLINK_EINVAL;
3573 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3577 if(!whitelist(mesh, (node_t *)node)) {
3578 pthread_mutex_unlock(&mesh->mutex);
3582 pthread_mutex_unlock(&mesh->mutex);
3584 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3588 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3589 if(!mesh || !name) {
3590 meshlink_errno = MESHLINK_EINVAL;
3594 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3598 node_t *n = lookup_node(mesh, (char *)name);
3602 n->name = xstrdup(name);
3606 if(!whitelist(mesh, (node_t *)n)) {
3607 pthread_mutex_unlock(&mesh->mutex);
3611 pthread_mutex_unlock(&mesh->mutex);
3613 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3617 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3618 mesh->default_blacklist = blacklist;
3621 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3622 if(!mesh || !node) {
3623 meshlink_errno = MESHLINK_EINVAL;
3627 node_t *n = (node_t *)node;
3629 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3633 /* Check that the node is not reachable */
3634 if(n->status.reachable || n->connection) {
3635 pthread_mutex_unlock(&mesh->mutex);
3636 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3640 /* Check that we don't have any active UTCP connections */
3641 if(n->utcp && utcp_is_active(n->utcp)) {
3642 pthread_mutex_unlock(&mesh->mutex);
3643 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3647 /* Check that we have no active connections to this node */
3648 for list_each(connection_t, c, mesh->connections) {
3650 pthread_mutex_unlock(&mesh->mutex);
3651 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3656 /* Remove any pending outgoings to this node */
3657 if(mesh->outgoings) {
3658 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3659 if(outgoing->node == n) {
3660 list_delete_node(mesh->outgoings, list_node);
3665 /* Delete the config file for this node */
3666 if(!config_delete(mesh, "current", n->name)) {
3667 pthread_mutex_unlock(&mesh->mutex);
3671 /* Delete any pending invitations */
3672 invitation_purge_node(mesh, n->name);
3674 /* Delete the node struct and any remaining edges referencing this node */
3677 pthread_mutex_unlock(&mesh->mutex);
3679 return config_sync(mesh, "current");
3682 /* Hint that a hostname may be found at an address
3683 * See header file for detailed comment.
3685 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3686 if(!mesh || !node || !addr) {
3687 meshlink_errno = EINVAL;
3691 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3695 node_t *n = (node_t *)node;
3697 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3698 if(!node_write_config(mesh, n)) {
3699 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3703 pthread_mutex_unlock(&mesh->mutex);
3704 // @TODO do we want to fire off a connection attempt right away?
3707 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3709 node_t *n = utcp->priv;
3710 meshlink_handle_t *mesh = n->mesh;
3712 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3713 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3715 return mesh->channel_accept_cb;
3719 /* Finish one AIO buffer, return true if the channel is still open. */
3720 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3721 meshlink_aio_buffer_t *aio = *head;
3725 channel->in_callback = true;
3728 if(aio->cb.buffer) {
3729 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3733 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3737 channel->in_callback = false;
3750 /* Finish all AIO buffers, return true if the channel is still open. */
3751 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3753 if(!aio_finish_one(mesh, channel, head)) {
3761 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3762 meshlink_channel_t *channel = connection->priv;
3768 node_t *n = channel->node;
3769 meshlink_handle_t *mesh = n->mesh;
3771 if(n->status.destroyed) {
3772 meshlink_channel_close(mesh, channel);
3776 const char *p = data;
3779 while(channel->aio_receive) {
3781 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3782 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3789 meshlink_aio_buffer_t *aio = channel->aio_receive;
3790 size_t todo = aio->len - aio->done;
3797 memcpy((char *)aio->data + aio->done, p, todo);
3799 ssize_t result = write(aio->fd, p, todo);
3802 if(result < 0 && errno == EINTR) {
3806 /* Writing to fd failed, cancel just this AIO buffer. */
3807 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3809 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3823 if(aio->done == aio->len) {
3824 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3834 if(channel->receive_cb) {
3835 channel->receive_cb(mesh, channel, p, left);
3841 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3842 node_t *n = utcp_connection->utcp->priv;
3848 meshlink_handle_t *mesh = n->mesh;
3850 if(!mesh->channel_accept_cb) {
3854 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3856 channel->c = utcp_connection;
3858 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3859 utcp_accept(utcp_connection, channel_recv, channel);
3865 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3866 node_t *n = utcp_connection->utcp->priv;
3867 meshlink_handle_t *mesh = n->mesh;
3869 if(n->mtuprobes == 31 && n->mtutimeout.cb) {
3870 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3876 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3877 node_t *n = utcp->priv;
3879 if(n->status.destroyed) {
3883 meshlink_handle_t *mesh = n->mesh;
3884 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3887 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3888 if(!mesh || !channel) {
3889 meshlink_errno = MESHLINK_EINVAL;
3893 channel->receive_cb = cb;
3896 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3898 node_t *n = (node_t *)source;
3904 utcp_recv(n->utcp, data, len);
3907 static void channel_poll(struct utcp_connection *connection, size_t len) {
3908 meshlink_channel_t *channel = connection->priv;
3914 node_t *n = channel->node;
3915 meshlink_handle_t *mesh = n->mesh;
3917 while(channel->aio_send) {
3919 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3920 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3927 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3928 meshlink_aio_buffer_t *aio = channel->aio_send;
3929 size_t todo = aio->len - aio->done;
3937 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3939 /* Limit the amount we read at once to avoid stack overflows */
3945 ssize_t result = read(aio->fd, buf, todo);
3949 sent = utcp_send(connection, buf, todo);
3951 if(result < 0 && errno == EINTR) {
3955 /* Reading from fd failed, cancel just this AIO buffer. */
3957 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3960 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3968 if(sent != (ssize_t)todo) {
3969 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3970 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3981 /* If we didn't finish this buffer, exit early. */
3982 if(aio->done < aio->len) {
3986 /* Signal completion of this buffer, and go to the next one. */
3987 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3996 if(channel->poll_cb) {
3997 channel->poll_cb(mesh, channel, len);
3999 utcp_set_poll_cb(connection, NULL);
4003 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
4004 if(!mesh || !channel) {
4005 meshlink_errno = MESHLINK_EINVAL;
4009 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4013 channel->poll_cb = cb;
4014 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
4015 pthread_mutex_unlock(&mesh->mutex);
4018 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
4020 meshlink_errno = MESHLINK_EINVAL;
4024 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4028 mesh->channel_listen_cb = cb;
4030 pthread_mutex_unlock(&mesh->mutex);
4033 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
4035 meshlink_errno = MESHLINK_EINVAL;
4039 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4043 mesh->channel_accept_cb = cb;
4044 mesh->receive_cb = channel_receive;
4046 for splay_each(node_t, n, mesh->nodes) {
4047 if(!n->utcp && n != mesh->self) {
4048 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4049 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4050 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4054 pthread_mutex_unlock(&mesh->mutex);
4057 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4058 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
4061 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
4062 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
4065 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4066 if(!mesh || !channel) {
4067 meshlink_errno = MESHLINK_EINVAL;
4071 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4075 utcp_set_sndbuf(channel->c, buf, size);
4076 pthread_mutex_unlock(&mesh->mutex);
4079 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
4080 if(!mesh || !channel) {
4081 meshlink_errno = MESHLINK_EINVAL;
4085 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4089 utcp_set_rcvbuf(channel->c, buf, size);
4090 pthread_mutex_unlock(&mesh->mutex);
4093 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
4094 if(!mesh || !channel) {
4095 meshlink_errno = MESHLINK_EINVAL;
4099 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4103 utcp_set_flags(channel->c, flags);
4104 pthread_mutex_unlock(&mesh->mutex);
4107 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) {
4109 abort(); // TODO: handle non-NULL data
4112 if(!mesh || !node) {
4113 meshlink_errno = MESHLINK_EINVAL;
4117 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4121 node_t *n = (node_t *)node;
4124 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4125 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4126 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4127 mesh->receive_cb = channel_receive;
4130 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4131 pthread_mutex_unlock(&mesh->mutex);
4136 if(n->status.blacklisted) {
4137 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
4138 meshlink_errno = MESHLINK_EBLACKLISTED;
4139 pthread_mutex_unlock(&mesh->mutex);
4143 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4145 channel->receive_cb = cb;
4148 channel->priv = (void *)data;
4151 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
4153 pthread_mutex_unlock(&mesh->mutex);
4156 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4164 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) {
4165 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4168 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4169 if(!mesh || !channel) {
4170 meshlink_errno = MESHLINK_EINVAL;
4174 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4178 utcp_shutdown(channel->c, direction);
4179 pthread_mutex_unlock(&mesh->mutex);
4182 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4183 if(!mesh || !channel) {
4184 meshlink_errno = MESHLINK_EINVAL;
4188 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4193 utcp_close(channel->c);
4196 /* Clean up any outstanding AIO buffers. */
4197 aio_abort(mesh, channel, &channel->aio_send);
4198 aio_abort(mesh, channel, &channel->aio_receive);
4201 if(!channel->in_callback) {
4205 pthread_mutex_unlock(&mesh->mutex);
4208 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4209 if(!mesh || !channel) {
4210 meshlink_errno = MESHLINK_EINVAL;
4219 meshlink_errno = MESHLINK_EINVAL;
4223 // TODO: more finegrained locking.
4224 // Ideally we want to put the data into the UTCP connection's send buffer.
4225 // Then, preferably only if there is room in the receiver window,
4226 // kick the meshlink thread to go send packets.
4230 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4234 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4235 if(channel->aio_send) {
4238 retval = utcp_send(channel->c, data, len);
4241 pthread_mutex_unlock(&mesh->mutex);
4244 meshlink_errno = MESHLINK_ENETWORK;
4250 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) {
4251 if(!mesh || !channel) {
4252 meshlink_errno = MESHLINK_EINVAL;
4257 meshlink_errno = MESHLINK_EINVAL;
4261 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4264 aio->cb.buffer = cb;
4267 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4271 /* Append the AIO buffer descriptor to the end of the chain */
4272 meshlink_aio_buffer_t **p = &channel->aio_send;
4280 /* Ensure the poll callback is set, and call it right now to push data if possible */
4281 utcp_set_poll_cb(channel->c, channel_poll);
4282 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4285 channel_poll(channel->c, todo);
4288 pthread_mutex_unlock(&mesh->mutex);
4293 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) {
4294 if(!mesh || !channel) {
4295 meshlink_errno = MESHLINK_EINVAL;
4299 if(!len || fd == -1) {
4300 meshlink_errno = MESHLINK_EINVAL;
4304 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4310 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4314 /* Append the AIO buffer descriptor to the end of the chain */
4315 meshlink_aio_buffer_t **p = &channel->aio_send;
4323 /* Ensure the poll callback is set, and call it right now to push data if possible */
4324 utcp_set_poll_cb(channel->c, channel_poll);
4325 size_t left = utcp_get_rcvbuf_free(channel->c);
4328 channel_poll(channel->c, left);
4331 pthread_mutex_unlock(&mesh->mutex);
4336 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) {
4337 if(!mesh || !channel) {
4338 meshlink_errno = MESHLINK_EINVAL;
4343 meshlink_errno = MESHLINK_EINVAL;
4347 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4350 aio->cb.buffer = cb;
4353 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4357 /* Append the AIO buffer descriptor to the end of the chain */
4358 meshlink_aio_buffer_t **p = &channel->aio_receive;
4366 pthread_mutex_unlock(&mesh->mutex);
4371 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) {
4372 if(!mesh || !channel) {
4373 meshlink_errno = MESHLINK_EINVAL;
4377 if(!len || fd == -1) {
4378 meshlink_errno = MESHLINK_EINVAL;
4382 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4388 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4392 /* Append the AIO buffer descriptor to the end of the chain */
4393 meshlink_aio_buffer_t **p = &channel->aio_receive;
4401 pthread_mutex_unlock(&mesh->mutex);
4406 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4407 if(!mesh || !channel) {
4408 meshlink_errno = MESHLINK_EINVAL;
4412 return channel->c->flags;
4415 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4416 if(!mesh || !channel) {
4417 meshlink_errno = MESHLINK_EINVAL;
4421 return utcp_get_sendq(channel->c);
4424 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4425 if(!mesh || !channel) {
4426 meshlink_errno = MESHLINK_EINVAL;
4430 return utcp_get_recvq(channel->c);
4433 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4434 if(!mesh || !channel) {
4435 meshlink_errno = MESHLINK_EINVAL;
4439 return utcp_get_mss(channel->node->utcp);
4442 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4443 if(!mesh || !node) {
4444 meshlink_errno = MESHLINK_EINVAL;
4448 node_t *n = (node_t *)node;
4450 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4455 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4456 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4457 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4460 utcp_set_user_timeout(n->utcp, timeout);
4462 pthread_mutex_unlock(&mesh->mutex);
4465 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4466 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4467 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4468 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4469 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4472 if(mesh->node_status_cb) {
4473 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4476 if(mesh->node_pmtu_cb) {
4477 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4481 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4482 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4484 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4485 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4489 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4490 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4494 n->status.duplicate = true;
4495 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4498 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4502 meshlink_errno = MESHLINK_EINVAL;
4506 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4510 if(mesh->discovery == enable) {
4514 if(mesh->threadstarted) {
4516 discovery_start(mesh);
4518 discovery_stop(mesh);
4522 mesh->discovery = enable;
4525 pthread_mutex_unlock(&mesh->mutex);
4529 meshlink_errno = MESHLINK_ENOTSUP;
4533 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4534 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4535 meshlink_errno = EINVAL;
4539 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4540 meshlink_errno = EINVAL;
4544 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4548 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4549 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4550 pthread_mutex_unlock(&mesh->mutex);
4553 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4554 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4555 meshlink_errno = EINVAL;
4559 if(fast_retry_period < 0) {
4560 meshlink_errno = EINVAL;
4564 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4568 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4569 pthread_mutex_unlock(&mesh->mutex);
4572 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4573 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4574 meshlink_errno = EINVAL;
4578 if(maxtimeout < 0) {
4579 meshlink_errno = EINVAL;
4583 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4587 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4588 pthread_mutex_unlock(&mesh->mutex);
4591 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4596 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4600 handle_network_change(mesh, true);
4601 pthread_mutex_unlock(&mesh->mutex);
4604 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4606 meshlink_errno = EINVAL;
4610 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4614 mesh->inviter_commits_first = inviter_commits_first;
4615 pthread_mutex_unlock(&mesh->mutex);
4618 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4620 meshlink_errno = EINVAL;
4624 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4625 meshlink_errno = EINVAL;
4629 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4633 free(mesh->external_address_url);
4634 mesh->external_address_url = url ? xstrdup(url) : NULL;
4635 pthread_mutex_unlock(&mesh->mutex);
4638 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4639 if(!mesh || granularity < 0) {
4640 meshlink_errno = EINVAL;
4644 utcp_set_clock_granularity(granularity);
4647 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4650 if(!mesh->connections || !mesh->loop.running) {
4655 signal_trigger(&mesh->loop, &mesh->datafromapp);
4658 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4659 // We should only call the callback function if we are in the background thread.
4660 if(!mesh->error_cb) {
4664 if(!mesh->threadstarted) {
4668 if(mesh->thread == pthread_self()) {
4669 mesh->error_cb(mesh, cb_errno);
4673 static void __attribute__((constructor)) meshlink_init(void) {
4675 utcp_set_clock_granularity(10000);
4678 static void __attribute__((destructor)) meshlink_exit(void) {