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) {
396 // Determine address of the local interface used for outgoing connections.
397 char localaddr[NI_MAXHOST];
398 bool success = false;
400 if(family == AF_INET) {
401 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
402 } else if(family == AF_INET6) {
403 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
406 #ifdef HAVE_GETIFADDRS
409 struct ifaddrs *ifa = NULL;
410 getifaddrs_in_netns(&ifa, mesh->netns);
412 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
413 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
415 if(!sa || sa->sa.sa_family != family) {
419 if(is_localaddr(sa)) {
423 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
435 meshlink_errno = MESHLINK_ENETWORK;
439 return xstrdup(localaddr);
442 static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
443 for(int i = 0; i < n; i++) {
448 // Ignore duplicate hostnames
451 for(int j = 0; j < i; j++) {
456 if(strcmp(host[i], host[j])) {
460 if(strcmp(port[i], port[j])) {
468 if(found || !is_valid_hostname(host[i])) {
478 // This gets the hostname part for use in invitation URLs
479 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
480 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
482 char *hostname[count];
484 char *hostport = NULL;
486 memset(hostname, 0, sizeof(hostname));
487 memset(port, 0, sizeof(port));
489 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
490 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
493 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
494 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
497 // Add all explicitly set invitation addresses
498 if(mesh->invitation_addresses) {
499 for list_each(char, combo, mesh->invitation_addresses) {
500 hostname[n] = xstrdup(combo);
501 char *slash = strrchr(hostname[n], '/');
505 port[n] = xstrdup(slash + 1);
512 // Add local addresses if requested
513 if(flags & MESHLINK_INVITE_LOCAL) {
514 if(flags & MESHLINK_INVITE_IPV4) {
515 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
518 if(flags & MESHLINK_INVITE_IPV6) {
519 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
523 // Add public/canonical addresses if requested
524 if(flags & MESHLINK_INVITE_PUBLIC) {
525 // Try the CanonicalAddress first
526 get_canonical_address(mesh->self, &hostname[n], &port[n]);
528 if(!hostname[n] && count == 4) {
529 if(flags & MESHLINK_INVITE_IPV4) {
530 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
533 if(flags & MESHLINK_INVITE_IPV6) {
534 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
541 for(int i = 0; i < n; i++) {
542 // Ensure we always have a port number
543 if(hostname[i] && !port[i]) {
544 port[i] = xstrdup(mesh->myport);
548 remove_duplicate_hostnames(hostname, port, n);
550 // Resolve the hostnames
551 for(int i = 0; i < n; i++) {
556 // Convert what we have to a sockaddr
557 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5);
563 // Remember the address(es)
564 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
565 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
572 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
573 remove_duplicate_hostnames(hostname, port, n);
575 // Concatenate all unique address to the hostport string
576 for(int i = 0; i < n; i++) {
581 // Append the address to the hostport string
583 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
585 hostport = newhostport;
594 static bool try_bind(meshlink_handle_t *mesh, int port) {
595 struct addrinfo *ai = NULL;
596 struct addrinfo hint = {
597 .ai_flags = AI_PASSIVE,
598 .ai_family = AF_UNSPEC,
599 .ai_socktype = SOCK_STREAM,
600 .ai_protocol = IPPROTO_TCP,
604 snprintf(portstr, sizeof(portstr), "%d", port);
606 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
610 bool success = false;
612 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
613 /* Try to bind to TCP. */
615 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
618 if(errno == EADDRINUSE) {
619 /* If this port is in use for any address family, avoid it. */
627 /* If TCP worked, then we require that UDP works as well. */
629 int udp_fd = setup_udp_listen_socket(mesh, aip);
646 int check_port(meshlink_handle_t *mesh) {
647 for(int i = 0; i < 1000; i++) {
648 int port = 0x1000 + prng(mesh, 0x8000);
650 if(try_bind(mesh, port)) {
652 xasprintf(&mesh->myport, "%d", port);
657 meshlink_errno = MESHLINK_ENETWORK;
658 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
662 static bool write_main_config_files(meshlink_handle_t *mesh) {
663 if(!mesh->confbase) {
669 /* Write the main config file */
670 packmsg_output_t out = {buf, sizeof buf};
672 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
673 packmsg_add_str(&out, mesh->name);
674 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
675 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
676 packmsg_add_uint16(&out, atoi(mesh->myport));
678 if(!packmsg_output_ok(&out)) {
682 config_t config = {buf, packmsg_output_size(&out, buf)};
684 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
688 /* Write our own host config file */
689 if(!node_write_config(mesh, mesh->self)) {
697 meshlink_handle_t *mesh;
699 char cookie[18 + 32];
710 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
711 meshlink_handle_t *mesh = state->mesh;
712 packmsg_input_t in = {buf, len};
713 uint32_t version = packmsg_get_uint32(&in);
715 if(version != MESHLINK_INVITATION_VERSION) {
716 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
720 char *name = packmsg_get_str_dup(&in);
721 char *submesh_name = packmsg_get_str_dup(&in);
722 dev_class_t devclass = packmsg_get_int32(&in);
723 uint32_t count = packmsg_get_array(&in);
725 if(!name || !check_id(name)) {
726 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
732 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
733 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
740 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
747 free(mesh->self->name);
749 mesh->self->name = xstrdup(name);
750 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
752 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
754 // Initialize configuration directory
755 if(!config_init(mesh, "current")) {
759 if(!write_main_config_files(mesh)) {
763 // Write host config files
764 for(uint32_t i = 0; i < count; i++) {
766 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
769 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
773 packmsg_input_t in2 = {data, data_len};
774 uint32_t version2 = packmsg_get_uint32(&in2);
775 char *name2 = packmsg_get_str_dup(&in2);
777 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
779 packmsg_input_invalidate(&in);
783 if(!check_id(name2)) {
788 if(!strcmp(name2, mesh->name)) {
789 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
791 meshlink_errno = MESHLINK_EPEER;
795 node_t *n = new_node();
798 config_t config = {data, data_len};
800 if(!node_read_from_config(mesh, n, &config)) {
802 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
803 meshlink_errno = MESHLINK_EPEER;
808 /* The first host config file is of the inviter itself;
809 * remember the address we are currently using for the invitation connection.
812 socklen_t salen = sizeof(sa);
814 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
815 node_add_recent_address(mesh, n, &sa);
819 /* Clear the reachability times, since we ourself have never seen these nodes yet */
820 n->last_reachable = 0;
821 n->last_unreachable = 0;
823 if(!node_write_config(mesh, n)) {
831 /* Ensure the configuration directory metadata is on disk */
832 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
836 if(!mesh->inviter_commits_first) {
837 devtool_set_inviter_commits_first(false);
840 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
842 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
847 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
849 join_state_t *state = handle;
850 const char *ptr = data;
853 int result = send(state->sock, ptr, len, 0);
855 if(result == -1 && errno == EINTR) {
857 } else if(result <= 0) {
868 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
869 join_state_t *state = handle;
870 meshlink_handle_t *mesh = state->mesh;
872 if(mesh->inviter_commits_first) {
874 case SPTPS_HANDSHAKE:
875 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
881 if(!finalize_join(state, msg, len)) {
885 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
886 shutdown(state->sock, SHUT_RDWR);
887 state->success = true;
895 case SPTPS_HANDSHAKE:
896 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
899 return finalize_join(state, msg, len);
902 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
903 shutdown(state->sock, SHUT_RDWR);
904 state->success = true;
915 static bool recvline(join_state_t *state) {
916 char *newline = NULL;
918 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
919 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
921 if(result == -1 && errno == EINTR) {
923 } else if(result <= 0) {
927 state->blen += result;
930 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
934 size_t len = newline - state->buffer;
936 memcpy(state->line, state->buffer, len);
937 state->line[len] = 0;
938 memmove(state->buffer, newline + 1, state->blen - len - 1);
939 state->blen -= len + 1;
944 static bool sendline(int fd, const char *format, ...) {
950 va_start(ap, format);
951 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
954 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
962 int result = send(fd, p, blen, MSG_NOSIGNAL);
964 if(result == -1 && errno == EINTR) {
966 } else if(result <= 0) {
977 static const char *errstr[] = {
978 [MESHLINK_OK] = "No error",
979 [MESHLINK_EINVAL] = "Invalid argument",
980 [MESHLINK_ENOMEM] = "Out of memory",
981 [MESHLINK_ENOENT] = "No such node",
982 [MESHLINK_EEXIST] = "Node already exists",
983 [MESHLINK_EINTERNAL] = "Internal error",
984 [MESHLINK_ERESOLV] = "Could not resolve hostname",
985 [MESHLINK_ESTORAGE] = "Storage error",
986 [MESHLINK_ENETWORK] = "Network error",
987 [MESHLINK_EPEER] = "Error communicating with peer",
988 [MESHLINK_ENOTSUP] = "Operation not supported",
989 [MESHLINK_EBUSY] = "MeshLink instance already in use",
990 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
993 const char *meshlink_strerror(meshlink_errno_t err) {
994 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
995 return "Invalid error code";
1001 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
1002 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
1004 mesh->private_key = ecdsa_generate();
1005 mesh->invitation_key = ecdsa_generate();
1007 if(!mesh->private_key || !mesh->invitation_key) {
1008 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
1009 meshlink_errno = MESHLINK_EINTERNAL;
1013 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1018 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
1019 if(a->tv_sec == b->tv_sec) {
1020 return a->tv_nsec < b->tv_nsec;
1022 return a->tv_sec < b->tv_sec;
1026 static struct timespec idle(event_loop_t *loop, void *data) {
1028 meshlink_handle_t *mesh = data;
1029 struct timespec t, tmin = {3600, 0};
1031 for splay_each(node_t, n, mesh->nodes) {
1036 t = utcp_timeout(n->utcp);
1038 if(timespec_lt(&t, &tmin)) {
1046 // Get our local address(es) by simulating connecting to an Internet host.
1047 static void add_local_addresses(meshlink_handle_t *mesh) {
1049 sa.storage.ss_family = AF_UNKNOWN;
1050 socklen_t salen = sizeof(sa);
1054 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1055 sa.in.sin_port = ntohs(atoi(mesh->myport));
1056 node_add_recent_address(mesh, mesh->self, &sa);
1063 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1064 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1065 node_add_recent_address(mesh, mesh->self, &sa);
1069 static bool meshlink_setup(meshlink_handle_t *mesh) {
1070 if(!config_destroy(mesh->confbase, "new")) {
1071 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1072 meshlink_errno = MESHLINK_ESTORAGE;
1076 if(!config_destroy(mesh->confbase, "old")) {
1077 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1078 meshlink_errno = MESHLINK_ESTORAGE;
1082 if(!config_init(mesh, "current")) {
1083 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1084 meshlink_errno = MESHLINK_ESTORAGE;
1088 if(!ecdsa_keygen(mesh)) {
1089 meshlink_errno = MESHLINK_EINTERNAL;
1093 if(check_port(mesh) == 0) {
1094 meshlink_errno = MESHLINK_ENETWORK;
1098 /* Create a node for ourself */
1100 mesh->self = new_node();
1101 mesh->self->name = xstrdup(mesh->name);
1102 mesh->self->devclass = mesh->devclass;
1103 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1104 mesh->self->session_id = mesh->session_id;
1106 if(!write_main_config_files(mesh)) {
1107 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1108 meshlink_errno = MESHLINK_ESTORAGE;
1112 /* Ensure the configuration directory metadata is on disk */
1113 if(!config_sync(mesh, "current")) {
1120 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1123 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1124 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1128 packmsg_input_t in = {config.buf, config.len};
1129 const void *private_key;
1130 const void *invitation_key;
1132 uint32_t version = packmsg_get_uint32(&in);
1133 char *name = packmsg_get_str_dup(&in);
1134 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1135 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1136 uint16_t myport = packmsg_get_uint16(&in);
1138 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1139 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1141 config_free(&config);
1145 if(mesh->name && strcmp(mesh->name, name)) {
1146 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1147 meshlink_errno = MESHLINK_ESTORAGE;
1149 config_free(&config);
1155 xasprintf(&mesh->myport, "%u", myport);
1156 mesh->private_key = ecdsa_set_private_key(private_key);
1157 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1158 config_free(&config);
1160 /* Create a node for ourself and read our host configuration file */
1162 mesh->self = new_node();
1163 mesh->self->name = xstrdup(name);
1164 mesh->self->devclass = mesh->devclass;
1165 mesh->self->session_id = mesh->session_id;
1167 if(!node_read_public_key(mesh, mesh->self)) {
1168 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1169 meshlink_errno = MESHLINK_ESTORAGE;
1170 free_node(mesh->self);
1179 static void *setup_network_in_netns_thread(void *arg) {
1180 meshlink_handle_t *mesh = arg;
1182 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1186 bool success = setup_network(mesh);
1187 return success ? arg : NULL;
1189 #endif // HAVE_SETNS
1191 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1192 if(!confbase || !*confbase) {
1193 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 if(!appname || !*appname) {
1199 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1200 meshlink_errno = MESHLINK_EINVAL;
1204 if(strchr(appname, ' ')) {
1205 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1206 meshlink_errno = MESHLINK_EINVAL;
1210 if(name && !check_id(name)) {
1211 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1212 meshlink_errno = MESHLINK_EINVAL;
1216 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1217 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1218 meshlink_errno = MESHLINK_EINVAL;
1222 meshlink_open_params_t *params = xzalloc(sizeof * params);
1224 params->confbase = xstrdup(confbase);
1225 params->name = name ? xstrdup(name) : NULL;
1226 params->appname = xstrdup(appname);
1227 params->devclass = devclass;
1233 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1235 meshlink_errno = MESHLINK_EINVAL;
1239 params->netns = netns;
1244 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1246 meshlink_errno = MESHLINK_EINVAL;
1250 if((!key && keylen) || (key && !keylen)) {
1251 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1252 meshlink_errno = MESHLINK_EINVAL;
1257 params->keylen = keylen;
1262 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1263 if(!mesh || !new_key || !new_keylen) {
1264 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1265 meshlink_errno = MESHLINK_EINVAL;
1269 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1273 // Create hash for the new key
1274 void *new_config_key;
1275 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1277 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1278 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1279 meshlink_errno = MESHLINK_EINTERNAL;
1280 pthread_mutex_unlock(&mesh->mutex);
1284 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1286 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1287 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1288 meshlink_errno = MESHLINK_ESTORAGE;
1289 pthread_mutex_unlock(&mesh->mutex);
1293 devtool_keyrotate_probe(1);
1295 // Rename confbase/current/ to confbase/old
1297 if(!config_rename(mesh, "current", "old")) {
1298 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1299 meshlink_errno = MESHLINK_ESTORAGE;
1300 pthread_mutex_unlock(&mesh->mutex);
1304 devtool_keyrotate_probe(2);
1306 // Rename confbase/new/ to confbase/current
1308 if(!config_rename(mesh, "new", "current")) {
1309 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1310 meshlink_errno = MESHLINK_ESTORAGE;
1311 pthread_mutex_unlock(&mesh->mutex);
1315 devtool_keyrotate_probe(3);
1317 // Cleanup the "old" confbase sub-directory
1319 if(!config_destroy(mesh->confbase, "old")) {
1320 pthread_mutex_unlock(&mesh->mutex);
1324 // Change the mesh handle key with new key
1326 free(mesh->config_key);
1327 mesh->config_key = new_config_key;
1329 pthread_mutex_unlock(&mesh->mutex);
1334 void meshlink_open_params_free(meshlink_open_params_t *params) {
1336 meshlink_errno = MESHLINK_EINVAL;
1340 free(params->confbase);
1342 free(params->appname);
1347 /// Device class traits
1348 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1349 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1350 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1351 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1352 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1355 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1356 if(!confbase || !*confbase) {
1357 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1358 meshlink_errno = MESHLINK_EINVAL;
1362 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1363 meshlink_open_params_t params;
1364 memset(¶ms, 0, sizeof(params));
1366 params.confbase = (char *)confbase;
1367 params.name = (char *)name;
1368 params.appname = (char *)appname;
1369 params.devclass = devclass;
1372 return meshlink_open_ex(¶ms);
1375 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) {
1376 if(!confbase || !*confbase) {
1377 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1378 meshlink_errno = MESHLINK_EINVAL;
1382 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1383 meshlink_open_params_t params;
1384 memset(¶ms, 0, sizeof(params));
1386 params.confbase = (char *)confbase;
1387 params.name = (char *)name;
1388 params.appname = (char *)appname;
1389 params.devclass = devclass;
1392 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1396 return meshlink_open_ex(¶ms);
1399 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1401 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1402 meshlink_errno = MESHLINK_EINVAL;
1406 if(!check_id(name)) {
1407 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1408 meshlink_errno = MESHLINK_EINVAL;
1412 if(!appname || !*appname) {
1413 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1414 meshlink_errno = MESHLINK_EINVAL;
1418 if(strchr(appname, ' ')) {
1419 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1420 meshlink_errno = MESHLINK_EINVAL;
1424 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1425 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1426 meshlink_errno = MESHLINK_EINVAL;
1430 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1431 meshlink_open_params_t params;
1432 memset(¶ms, 0, sizeof(params));
1434 params.name = (char *)name;
1435 params.appname = (char *)appname;
1436 params.devclass = devclass;
1439 return meshlink_open_ex(¶ms);
1442 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1443 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1445 // Validate arguments provided by the application
1446 if(!params->appname || !*params->appname) {
1447 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1448 meshlink_errno = MESHLINK_EINVAL;
1452 if(strchr(params->appname, ' ')) {
1453 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1454 meshlink_errno = MESHLINK_EINVAL;
1458 if(params->name && !check_id(params->name)) {
1459 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1460 meshlink_errno = MESHLINK_EINVAL;
1464 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1465 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1466 meshlink_errno = MESHLINK_EINVAL;
1470 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1471 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1472 meshlink_errno = MESHLINK_EINVAL;
1476 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1478 if(params->confbase) {
1479 mesh->confbase = xstrdup(params->confbase);
1482 mesh->appname = xstrdup(params->appname);
1483 mesh->devclass = params->devclass;
1484 mesh->discovery = true;
1485 mesh->invitation_timeout = 604800; // 1 week
1486 mesh->netns = params->netns;
1487 mesh->submeshes = NULL;
1488 mesh->log_cb = global_log_cb;
1489 mesh->log_level = global_log_level;
1490 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1492 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1495 randomize(&mesh->session_id, sizeof(mesh->session_id));
1496 } while(mesh->session_id == 0);
1498 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1500 mesh->name = params->name ? xstrdup(params->name) : NULL;
1504 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1506 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1507 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1508 meshlink_close(mesh);
1509 meshlink_errno = MESHLINK_EINTERNAL;
1514 // initialize mutexes and conds
1515 pthread_mutexattr_t attr;
1516 pthread_mutexattr_init(&attr);
1518 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1522 pthread_mutex_init(&mesh->mutex, &attr);
1523 pthread_cond_init(&mesh->cond, NULL);
1525 pthread_mutex_init(&mesh->discovery_mutex, NULL);
1526 pthread_cond_init(&mesh->discovery_cond, NULL);
1528 pthread_cond_init(&mesh->adns_cond, NULL);
1530 mesh->threadstarted = false;
1531 event_loop_init(&mesh->loop);
1532 mesh->loop.data = mesh;
1534 meshlink_queue_init(&mesh->outpacketqueue);
1536 // Atomically lock the configuration directory.
1537 if(!main_config_lock(mesh)) {
1538 meshlink_close(mesh);
1542 // If no configuration exists yet, create it.
1544 if(!meshlink_confbase_exists(mesh)) {
1546 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1547 meshlink_close(mesh);
1548 meshlink_errno = MESHLINK_ESTORAGE;
1552 if(!meshlink_setup(mesh)) {
1553 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1554 meshlink_close(mesh);
1558 if(!meshlink_read_config(mesh)) {
1559 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1560 meshlink_close(mesh);
1566 struct WSAData wsa_state;
1567 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1570 // Setup up everything
1571 // TODO: we should not open listening sockets yet
1573 bool success = false;
1575 if(mesh->netns != -1) {
1579 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1580 void *retval = NULL;
1581 success = pthread_join(thr, &retval) == 0 && retval;
1585 meshlink_errno = MESHLINK_EINTERNAL;
1588 #endif // HAVE_SETNS
1590 success = setup_network(mesh);
1594 meshlink_close(mesh);
1595 meshlink_errno = MESHLINK_ENETWORK;
1599 add_local_addresses(mesh);
1601 if(!node_write_config(mesh, mesh->self)) {
1602 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1606 idle_set(&mesh->loop, idle, mesh);
1608 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1612 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1613 meshlink_submesh_t *s = NULL;
1616 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1617 meshlink_errno = MESHLINK_EINVAL;
1621 if(!submesh || !*submesh) {
1622 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1623 meshlink_errno = MESHLINK_EINVAL;
1628 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1632 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1634 pthread_mutex_unlock(&mesh->mutex);
1639 static void *meshlink_main_loop(void *arg) {
1640 meshlink_handle_t *mesh = arg;
1642 if(mesh->netns != -1) {
1645 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1646 pthread_cond_signal(&mesh->cond);
1651 pthread_cond_signal(&mesh->cond);
1653 #endif // HAVE_SETNS
1658 if(mesh->discovery) {
1659 discovery_start(mesh);
1664 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1668 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1669 pthread_cond_broadcast(&mesh->cond);
1671 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1673 pthread_mutex_unlock(&mesh->mutex);
1678 if(mesh->discovery) {
1679 discovery_stop(mesh);
1687 bool meshlink_start(meshlink_handle_t *mesh) {
1689 meshlink_errno = MESHLINK_EINVAL;
1693 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1695 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1700 assert(mesh->private_key);
1701 assert(mesh->self->ecdsa);
1702 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1704 if(mesh->threadstarted) {
1705 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1706 pthread_mutex_unlock(&mesh->mutex);
1710 if(mesh->listen_socket[0].tcp.fd < 0) {
1711 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1712 meshlink_errno = MESHLINK_ENETWORK;
1716 // TODO: open listening sockets first
1718 //Check that a valid name is set
1720 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1721 meshlink_errno = MESHLINK_EINVAL;
1722 pthread_mutex_unlock(&mesh->mutex);
1726 init_outgoings(mesh);
1729 // Start the main thread
1731 event_loop_start(&mesh->loop);
1733 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1734 pthread_attr_t attr;
1735 pthread_attr_init(&attr);
1736 pthread_attr_setstacksize(&attr, 1024 * 1024);
1738 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1739 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1740 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1741 meshlink_errno = MESHLINK_EINTERNAL;
1742 event_loop_stop(&mesh->loop);
1743 pthread_mutex_unlock(&mesh->mutex);
1747 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1748 mesh->threadstarted = true;
1750 // Ensure we are considered reachable
1753 pthread_mutex_unlock(&mesh->mutex);
1757 void meshlink_stop(meshlink_handle_t *mesh) {
1759 meshlink_errno = MESHLINK_EINVAL;
1763 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1767 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1769 // Shut down the main thread
1770 event_loop_stop(&mesh->loop);
1772 // Send ourselves a UDP packet to kick the event loop
1773 for(int i = 0; i < mesh->listen_sockets; i++) {
1775 socklen_t salen = sizeof(sa);
1777 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1778 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1782 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1783 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1787 if(mesh->threadstarted) {
1788 // Wait for the main thread to finish
1789 pthread_mutex_unlock(&mesh->mutex);
1791 if(pthread_join(mesh->thread, NULL) != 0) {
1795 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1799 mesh->threadstarted = false;
1802 // Close all metaconnections
1803 if(mesh->connections) {
1804 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1806 connection_t *c = node->data;
1808 terminate_connection(mesh, c, false);
1813 exit_outgoings(mesh);
1815 // Ensure we are considered unreachable
1820 // Try to write out any changed node config files, ignore errors at this point.
1822 for splay_each(node_t, n, mesh->nodes) {
1823 if(n->status.dirty) {
1824 n->status.dirty = !node_write_config(mesh, n);
1829 pthread_mutex_unlock(&mesh->mutex);
1832 void meshlink_close(meshlink_handle_t *mesh) {
1834 meshlink_errno = MESHLINK_EINVAL;
1838 // stop can be called even if mesh has not been started
1839 meshlink_stop(mesh);
1841 // lock is not released after this
1842 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1846 // Close and free all resources used.
1848 close_network_connections(mesh);
1850 logger(mesh, MESHLINK_INFO, "Terminating");
1852 event_loop_exit(&mesh->loop);
1856 if(mesh->confbase) {
1862 ecdsa_free(mesh->invitation_key);
1864 if(mesh->netns != -1) {
1868 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1872 meshlink_queue_exit(&mesh->outpacketqueue);
1875 free(mesh->appname);
1876 free(mesh->confbase);
1877 free(mesh->config_key);
1878 free(mesh->external_address_url);
1880 ecdsa_free(mesh->private_key);
1882 if(mesh->invitation_addresses) {
1883 list_delete_list(mesh->invitation_addresses);
1886 main_config_unlock(mesh);
1888 pthread_mutex_unlock(&mesh->mutex);
1889 pthread_mutex_destroy(&mesh->mutex);
1891 memset(mesh, 0, sizeof(*mesh));
1896 bool meshlink_destroy(const char *confbase) {
1898 meshlink_errno = MESHLINK_EINVAL;
1902 /* Exit early if the confbase directory itself doesn't exist */
1903 if(access(confbase, F_OK) && errno == ENOENT) {
1907 /* Take the lock the same way meshlink_open() would. */
1908 char lockfilename[PATH_MAX];
1909 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1911 FILE *lockfile = fopen(lockfilename, "w+");
1914 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1915 meshlink_errno = MESHLINK_ESTORAGE;
1920 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1924 // TODO: use _locking()?
1927 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1928 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1930 meshlink_errno = MESHLINK_EBUSY;
1936 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1937 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1941 if(unlink(lockfilename)) {
1942 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1944 meshlink_errno = MESHLINK_ESTORAGE;
1950 if(!sync_path(confbase)) {
1951 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1952 meshlink_errno = MESHLINK_ESTORAGE;
1959 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1961 meshlink_errno = MESHLINK_EINVAL;
1965 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1969 mesh->receive_cb = cb;
1970 pthread_mutex_unlock(&mesh->mutex);
1973 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1975 meshlink_errno = MESHLINK_EINVAL;
1979 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1983 mesh->connection_try_cb = cb;
1984 pthread_mutex_unlock(&mesh->mutex);
1987 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1989 meshlink_errno = MESHLINK_EINVAL;
1993 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1997 mesh->node_status_cb = cb;
1998 pthread_mutex_unlock(&mesh->mutex);
2001 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
2003 meshlink_errno = MESHLINK_EINVAL;
2007 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2011 mesh->node_pmtu_cb = cb;
2012 pthread_mutex_unlock(&mesh->mutex);
2015 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
2017 meshlink_errno = MESHLINK_EINVAL;
2021 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2025 mesh->node_duplicate_cb = cb;
2026 pthread_mutex_unlock(&mesh->mutex);
2029 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
2031 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2036 mesh->log_level = cb ? level : 0;
2037 pthread_mutex_unlock(&mesh->mutex);
2040 global_log_level = cb ? level : 0;
2044 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2046 meshlink_errno = MESHLINK_EINVAL;
2050 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2054 mesh->error_cb = cb;
2055 pthread_mutex_unlock(&mesh->mutex);
2058 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2059 meshlink_packethdr_t *hdr;
2061 if(len > MAXSIZE - sizeof(*hdr)) {
2062 meshlink_errno = MESHLINK_EINVAL;
2066 node_t *n = (node_t *)destination;
2068 if(n->status.blacklisted) {
2069 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2070 meshlink_errno = MESHLINK_EBLACKLISTED;
2074 // Prepare the packet
2075 packet->probe = false;
2076 packet->tcp = false;
2077 packet->len = len + sizeof(*hdr);
2079 hdr = (meshlink_packethdr_t *)packet->data;
2080 memset(hdr, 0, sizeof(*hdr));
2081 // leave the last byte as 0 to make sure strings are always
2082 // null-terminated if they are longer than the buffer
2083 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2084 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2086 memcpy(packet->data + sizeof(*hdr), data, len);
2091 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2093 assert(destination);
2097 // Prepare the packet
2098 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2102 // Send it immediately
2103 route(mesh, mesh->self, mesh->packet);
2108 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2109 // Validate arguments
2110 if(!mesh || !destination) {
2111 meshlink_errno = MESHLINK_EINVAL;
2120 meshlink_errno = MESHLINK_EINVAL;
2124 // Prepare the packet
2125 vpn_packet_t *packet = malloc(sizeof(*packet));
2128 meshlink_errno = MESHLINK_ENOMEM;
2132 if(!prepare_packet(mesh, destination, data, len, packet)) {
2138 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2140 meshlink_errno = MESHLINK_ENOMEM;
2144 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2146 // Notify event loop
2147 signal_trigger(&mesh->loop, &mesh->datafromapp);
2152 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2154 meshlink_handle_t *mesh = data;
2156 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2158 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2159 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2160 mesh->self->in_packets++;
2161 mesh->self->in_bytes += packet->len;
2162 route(mesh, mesh->self, packet);
2167 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2168 if(!mesh || !destination) {
2169 meshlink_errno = MESHLINK_EINVAL;
2173 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2177 node_t *n = (node_t *)destination;
2179 if(!n->status.reachable) {
2180 pthread_mutex_unlock(&mesh->mutex);
2183 } else if(n->mtuprobes > 30 && n->minmtu) {
2184 pthread_mutex_unlock(&mesh->mutex);
2187 pthread_mutex_unlock(&mesh->mutex);
2192 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2193 if(!mesh || !node) {
2194 meshlink_errno = MESHLINK_EINVAL;
2198 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2202 node_t *n = (node_t *)node;
2204 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2205 meshlink_errno = MESHLINK_EINTERNAL;
2206 pthread_mutex_unlock(&mesh->mutex);
2210 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2213 meshlink_errno = MESHLINK_EINTERNAL;
2216 pthread_mutex_unlock(&mesh->mutex);
2220 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2222 meshlink_errno = MESHLINK_EINVAL;
2226 return (meshlink_node_t *)mesh->self;
2229 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2230 if(!mesh || !name) {
2231 meshlink_errno = MESHLINK_EINVAL;
2237 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2241 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2242 pthread_mutex_unlock(&mesh->mutex);
2245 meshlink_errno = MESHLINK_ENOENT;
2248 return (meshlink_node_t *)n;
2251 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2252 if(!mesh || !name) {
2253 meshlink_errno = MESHLINK_EINVAL;
2257 meshlink_submesh_t *submesh = NULL;
2259 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2263 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2264 pthread_mutex_unlock(&mesh->mutex);
2267 meshlink_errno = MESHLINK_ENOENT;
2273 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2274 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2275 meshlink_errno = MESHLINK_EINVAL;
2279 meshlink_node_t **result;
2282 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2286 *nmemb = mesh->nodes->count;
2287 result = realloc(nodes, *nmemb * sizeof(*nodes));
2290 meshlink_node_t **p = result;
2292 for splay_each(node_t, n, mesh->nodes) {
2293 *p++ = (meshlink_node_t *)n;
2298 meshlink_errno = MESHLINK_ENOMEM;
2301 pthread_mutex_unlock(&mesh->mutex);
2306 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) {
2307 meshlink_node_t **result;
2309 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2315 for splay_each(node_t, n, mesh->nodes) {
2316 if(search_node(n, condition)) {
2323 pthread_mutex_unlock(&mesh->mutex);
2327 result = realloc(nodes, *nmemb * sizeof(*nodes));
2330 meshlink_node_t **p = result;
2332 for splay_each(node_t, n, mesh->nodes) {
2333 if(search_node(n, condition)) {
2334 *p++ = (meshlink_node_t *)n;
2340 meshlink_errno = MESHLINK_ENOMEM;
2343 pthread_mutex_unlock(&mesh->mutex);
2348 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2349 dev_class_t *devclass = (dev_class_t *)condition;
2351 if(*devclass == (dev_class_t)node->devclass) {
2358 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2359 if(condition == node->submesh) {
2371 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2372 const struct time_range *range = condition;
2373 time_t start = node->last_reachable;
2374 time_t end = node->last_unreachable;
2384 if(range->end >= range->start) {
2385 return start <= range->end && end >= range->start;
2387 return start > range->start || end < range->end;
2391 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) {
2392 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2393 meshlink_errno = MESHLINK_EINVAL;
2397 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2400 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2401 if(!mesh || !submesh || !nmemb) {
2402 meshlink_errno = MESHLINK_EINVAL;
2406 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2409 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) {
2410 if(!mesh || !nmemb) {
2411 meshlink_errno = MESHLINK_EINVAL;
2415 struct time_range range = {start, end};
2417 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2420 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2421 if(!mesh || !node) {
2422 meshlink_errno = MESHLINK_EINVAL;
2426 dev_class_t devclass;
2428 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2432 devclass = ((node_t *)node)->devclass;
2434 pthread_mutex_unlock(&mesh->mutex);
2439 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2440 if(!mesh || !node) {
2441 meshlink_errno = MESHLINK_EINVAL;
2445 node_t *n = (node_t *)node;
2447 meshlink_submesh_t *s;
2449 s = (meshlink_submesh_t *)n->submesh;
2454 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2455 if(!mesh || !node) {
2456 meshlink_errno = MESHLINK_EINVAL;
2460 node_t *n = (node_t *)node;
2463 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2467 reachable = n->status.reachable && !n->status.blacklisted;
2469 if(last_reachable) {
2470 *last_reachable = n->last_reachable;
2473 if(last_unreachable) {
2474 *last_unreachable = n->last_unreachable;
2477 pthread_mutex_unlock(&mesh->mutex);
2482 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2483 if(!mesh || !data || !len || !signature || !siglen) {
2484 meshlink_errno = MESHLINK_EINVAL;
2488 if(*siglen < MESHLINK_SIGLEN) {
2489 meshlink_errno = MESHLINK_EINVAL;
2493 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2497 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2498 meshlink_errno = MESHLINK_EINTERNAL;
2499 pthread_mutex_unlock(&mesh->mutex);
2503 *siglen = MESHLINK_SIGLEN;
2504 pthread_mutex_unlock(&mesh->mutex);
2508 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2509 if(!mesh || !source || !data || !len || !signature) {
2510 meshlink_errno = MESHLINK_EINVAL;
2514 if(siglen != MESHLINK_SIGLEN) {
2515 meshlink_errno = MESHLINK_EINVAL;
2519 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2525 struct node_t *n = (struct node_t *)source;
2527 if(!node_read_public_key(mesh, n)) {
2528 meshlink_errno = MESHLINK_EINTERNAL;
2531 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2534 pthread_mutex_unlock(&mesh->mutex);
2538 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2539 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2543 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2546 // TODO: Update invitation key if necessary?
2549 pthread_mutex_unlock(&mesh->mutex);
2551 return mesh->invitation_key;
2554 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2555 if(!mesh || !node || !address) {
2556 meshlink_errno = MESHLINK_EINVAL;
2560 if(!is_valid_hostname(address)) {
2561 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2562 meshlink_errno = MESHLINK_EINVAL;
2566 if((node_t *)node != mesh->self && !port) {
2567 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2568 meshlink_errno = MESHLINK_EINVAL;
2573 if(port && !is_valid_port(port)) {
2574 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2575 meshlink_errno = MESHLINK_EINVAL;
2579 char *canonical_address;
2582 xasprintf(&canonical_address, "%s %s", address, port);
2584 canonical_address = xstrdup(address);
2587 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2591 node_t *n = (node_t *)node;
2592 free(n->canonical_address);
2593 n->canonical_address = canonical_address;
2595 if(!node_write_config(mesh, n)) {
2596 pthread_mutex_unlock(&mesh->mutex);
2600 pthread_mutex_unlock(&mesh->mutex);
2602 return config_sync(mesh, "current");
2605 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2606 if(!mesh || !address) {
2607 meshlink_errno = MESHLINK_EINVAL;
2611 if(!is_valid_hostname(address)) {
2612 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2613 meshlink_errno = MESHLINK_EINVAL;
2617 if(port && !is_valid_port(port)) {
2618 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2619 meshlink_errno = MESHLINK_EINVAL;
2626 xasprintf(&combo, "%s/%s", address, port);
2628 combo = xstrdup(address);
2631 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2635 if(!mesh->invitation_addresses) {
2636 mesh->invitation_addresses = list_alloc((list_action_t)free);
2639 list_insert_tail(mesh->invitation_addresses, combo);
2640 pthread_mutex_unlock(&mesh->mutex);
2645 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2647 meshlink_errno = MESHLINK_EINVAL;
2651 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2655 if(mesh->invitation_addresses) {
2656 list_delete_list(mesh->invitation_addresses);
2657 mesh->invitation_addresses = NULL;
2660 pthread_mutex_unlock(&mesh->mutex);
2663 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2664 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2667 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2669 meshlink_errno = MESHLINK_EINVAL;
2673 char *address = meshlink_get_external_address(mesh);
2679 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2685 int meshlink_get_port(meshlink_handle_t *mesh) {
2687 meshlink_errno = MESHLINK_EINVAL;
2692 meshlink_errno = MESHLINK_EINTERNAL;
2698 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2702 port = atoi(mesh->myport);
2703 pthread_mutex_unlock(&mesh->mutex);
2708 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2709 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2710 meshlink_errno = MESHLINK_EINVAL;
2714 if(mesh->myport && port == atoi(mesh->myport)) {
2718 if(!try_bind(mesh, port)) {
2719 meshlink_errno = MESHLINK_ENETWORK;
2723 devtool_trybind_probe();
2727 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2731 if(mesh->threadstarted) {
2732 meshlink_errno = MESHLINK_EINVAL;
2737 xasprintf(&mesh->myport, "%d", port);
2739 /* Close down the network. This also deletes mesh->self. */
2740 close_network_connections(mesh);
2742 /* Recreate mesh->self. */
2743 mesh->self = new_node();
2744 mesh->self->name = xstrdup(mesh->name);
2745 mesh->self->devclass = mesh->devclass;
2746 mesh->self->session_id = mesh->session_id;
2747 xasprintf(&mesh->myport, "%d", port);
2749 if(!node_read_public_key(mesh, mesh->self)) {
2750 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2751 meshlink_errno = MESHLINK_ESTORAGE;
2752 free_node(mesh->self);
2755 } else if(!setup_network(mesh)) {
2756 meshlink_errno = MESHLINK_ENETWORK;
2760 /* Rebuild our own list of recent addresses */
2761 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2762 add_local_addresses(mesh);
2764 /* Write meshlink.conf with the updated port number */
2765 write_main_config_files(mesh);
2767 rval = config_sync(mesh, "current");
2770 pthread_mutex_unlock(&mesh->mutex);
2772 return rval && meshlink_get_port(mesh) == port;
2775 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2776 mesh->invitation_timeout = timeout;
2779 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2780 meshlink_submesh_t *s = NULL;
2783 meshlink_errno = MESHLINK_EINVAL;
2788 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2791 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2792 meshlink_errno = MESHLINK_EINVAL;
2796 s = (meshlink_submesh_t *)mesh->self->submesh;
2799 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2803 // Check validity of the new node's name
2804 if(!check_id(name)) {
2805 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2806 meshlink_errno = MESHLINK_EINVAL;
2807 pthread_mutex_unlock(&mesh->mutex);
2811 // Ensure no host configuration file with that name exists
2812 if(config_exists(mesh, "current", name)) {
2813 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2814 meshlink_errno = MESHLINK_EEXIST;
2815 pthread_mutex_unlock(&mesh->mutex);
2819 // Ensure no other nodes know about this name
2820 if(lookup_node(mesh, name)) {
2821 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2822 meshlink_errno = MESHLINK_EEXIST;
2823 pthread_mutex_unlock(&mesh->mutex);
2827 // Get the local address
2828 char *address = get_my_hostname(mesh, flags);
2831 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2832 meshlink_errno = MESHLINK_ERESOLV;
2833 pthread_mutex_unlock(&mesh->mutex);
2837 if(!refresh_invitation_key(mesh)) {
2838 meshlink_errno = MESHLINK_EINTERNAL;
2839 pthread_mutex_unlock(&mesh->mutex);
2843 // If we changed our own host config file, write it out now
2844 if(mesh->self->status.dirty) {
2845 if(!node_write_config(mesh, mesh->self)) {
2846 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2847 pthread_mutex_unlock(&mesh->mutex);
2854 // Create a hash of the key.
2855 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2856 sha512(fingerprint, strlen(fingerprint), hash);
2857 b64encode_urlsafe(hash, hash, 18);
2859 // Create a random cookie for this invitation.
2861 randomize(cookie, 18);
2863 // Create a filename that doesn't reveal the cookie itself
2864 char buf[18 + strlen(fingerprint)];
2865 char cookiehash[64];
2866 memcpy(buf, cookie, 18);
2867 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2868 sha512(buf, sizeof(buf), cookiehash);
2869 b64encode_urlsafe(cookiehash, cookiehash, 18);
2871 b64encode_urlsafe(cookie, cookie, 18);
2875 /* Construct the invitation file */
2876 uint8_t outbuf[4096];
2877 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2879 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2880 packmsg_add_str(&inv, name);
2881 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2882 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2884 /* TODO: Add several host config files to bootstrap connections.
2885 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2886 * and are not blacklisted.
2888 config_t configs[5];
2889 memset(configs, 0, sizeof(configs));
2892 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2896 /* Append host config files to the invitation file */
2897 packmsg_add_array(&inv, count);
2899 for(int i = 0; i < count; i++) {
2900 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2901 config_free(&configs[i]);
2904 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2906 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2907 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2908 meshlink_errno = MESHLINK_ESTORAGE;
2909 pthread_mutex_unlock(&mesh->mutex);
2913 // Create an URL from the local address, key hash and cookie
2915 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2918 pthread_mutex_unlock(&mesh->mutex);
2922 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2923 return meshlink_invite_ex(mesh, submesh, name, 0);
2926 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2927 if(!mesh || !invitation) {
2928 meshlink_errno = MESHLINK_EINVAL;
2932 join_state_t state = {
2937 ecdsa_t *key = NULL;
2938 ecdsa_t *hiskey = NULL;
2940 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2941 char copy[strlen(invitation) + 1];
2943 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2947 //Before doing meshlink_join make sure we are not connected to another mesh
2948 if(mesh->threadstarted) {
2949 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2950 meshlink_errno = MESHLINK_EINVAL;
2954 // 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.
2955 if(mesh->nodes->count > 1) {
2956 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2957 meshlink_errno = MESHLINK_EINVAL;
2961 strcpy(copy, invitation);
2963 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2965 char *slash = strchr(copy, '/');
2973 if(strlen(slash) != 48) {
2977 char *address = copy;
2980 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2984 if(mesh->inviter_commits_first) {
2985 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2988 // Generate a throw-away key for the invitation.
2989 key = ecdsa_generate();
2992 meshlink_errno = MESHLINK_EINTERNAL;
2996 char *b64key = ecdsa_get_base64_public_key(key);
2999 while(address && *address) {
3000 // We allow commas in the address part to support multiple addresses in one invitation URL.
3001 comma = strchr(address, ',');
3007 // Split of the port
3008 port = strrchr(address, ':');
3016 // IPv6 address are enclosed in brackets, per RFC 3986
3017 if(*address == '[') {
3019 char *bracket = strchr(address, ']');
3032 // Connect to the meshlink daemon mentioned in the URL.
3033 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 5);
3036 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
3037 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
3039 if(state.sock == -1) {
3040 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
3041 meshlink_errno = MESHLINK_ENETWORK;
3047 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3050 set_timeout(state.sock, 5000);
3052 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3053 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3054 meshlink_errno = MESHLINK_ENETWORK;
3055 closesocket(state.sock);
3065 meshlink_errno = MESHLINK_ERESOLV;
3068 if(state.sock != -1 || !comma) {
3075 if(state.sock == -1) {
3079 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3081 // Tell him we have an invitation, and give him our throw-away key.
3085 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3086 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3087 meshlink_errno = MESHLINK_ENETWORK;
3093 char hisname[4096] = "";
3094 int code, hismajor, hisminor = 0;
3096 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) {
3097 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
3098 meshlink_errno = MESHLINK_ENETWORK;
3102 // Check if the hash of the key he gave us matches the hash in the URL.
3103 char *fingerprint = state.line + 2;
3106 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3107 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
3108 meshlink_errno = MESHLINK_EINTERNAL;
3112 if(memcmp(hishash, state.hash, 18)) {
3113 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
3114 meshlink_errno = MESHLINK_EPEER;
3118 hiskey = ecdsa_set_base64_public_key(fingerprint);
3121 meshlink_errno = MESHLINK_EINTERNAL;
3125 // Start an SPTPS session
3126 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3127 meshlink_errno = MESHLINK_EINTERNAL;
3131 // Feed rest of input buffer to SPTPS
3132 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3133 meshlink_errno = MESHLINK_EPEER;
3138 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3140 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3142 if(errno == EINTR) {
3146 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3147 meshlink_errno = MESHLINK_ENETWORK;
3151 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3152 meshlink_errno = MESHLINK_EPEER;
3157 if(!state.success) {
3158 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3159 meshlink_errno = MESHLINK_EPEER;
3163 sptps_stop(&state.sptps);
3166 closesocket(state.sock);
3168 pthread_mutex_unlock(&mesh->mutex);
3172 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3173 meshlink_errno = MESHLINK_EINVAL;
3175 sptps_stop(&state.sptps);
3179 if(state.sock != -1) {
3180 closesocket(state.sock);
3183 pthread_mutex_unlock(&mesh->mutex);
3187 char *meshlink_export(meshlink_handle_t *mesh) {
3189 meshlink_errno = MESHLINK_EINVAL;
3193 // Create a config file on the fly.
3196 packmsg_output_t out = {buf, sizeof(buf)};
3197 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3198 packmsg_add_str(&out, mesh->name);
3199 packmsg_add_str(&out, CORE_MESH);
3201 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3205 packmsg_add_int32(&out, mesh->self->devclass);
3206 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3207 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3209 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3210 char *canonical_address = NULL;
3211 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3212 packmsg_add_str(&out, canonical_address);
3213 free(canonical_address);
3215 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3220 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3221 if(mesh->self->recent[i].sa.sa_family) {
3228 packmsg_add_array(&out, count);
3230 for(uint32_t i = 0; i < count; i++) {
3231 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3234 packmsg_add_int64(&out, 0);
3235 packmsg_add_int64(&out, 0);
3237 pthread_mutex_unlock(&mesh->mutex);
3239 if(!packmsg_output_ok(&out)) {
3240 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3241 meshlink_errno = MESHLINK_EINTERNAL;
3245 // Prepare a base64-encoded packmsg array containing our config file
3247 uint32_t len = packmsg_output_size(&out, buf);
3248 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3249 uint8_t *buf2 = xmalloc(len2);
3250 packmsg_output_t out2 = {buf2, len2};
3251 packmsg_add_array(&out2, 1);
3252 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3254 if(!packmsg_output_ok(&out2)) {
3255 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3256 meshlink_errno = MESHLINK_EINTERNAL;
3261 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3263 return (char *)buf2;
3266 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3267 if(!mesh || !data) {
3268 meshlink_errno = MESHLINK_EINVAL;
3272 size_t datalen = strlen(data);
3273 uint8_t *buf = xmalloc(datalen);
3274 int buflen = b64decode(data, buf, datalen);
3277 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3278 meshlink_errno = MESHLINK_EPEER;
3282 packmsg_input_t in = {buf, buflen};
3283 uint32_t count = packmsg_get_array(&in);
3286 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3287 meshlink_errno = MESHLINK_EPEER;
3291 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3297 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3303 packmsg_input_t in2 = {data2, len2};
3304 uint32_t version = packmsg_get_uint32(&in2);
3305 char *name = packmsg_get_str_dup(&in2);
3307 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3309 packmsg_input_invalidate(&in);
3313 if(!check_id(name)) {
3318 node_t *n = lookup_node(mesh, name);
3321 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3329 config_t config = {data2, len2};
3331 if(!node_read_from_config(mesh, n, &config)) {
3333 packmsg_input_invalidate(&in);
3337 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3338 n->last_reachable = 0;
3339 n->last_unreachable = 0;
3341 if(!node_write_config(mesh, n)) {
3349 pthread_mutex_unlock(&mesh->mutex);
3353 if(!packmsg_done(&in)) {
3354 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3355 meshlink_errno = MESHLINK_EPEER;
3359 if(!config_sync(mesh, "current")) {
3366 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3367 if(n == mesh->self) {
3368 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3369 meshlink_errno = MESHLINK_EINVAL;
3373 if(n->status.blacklisted) {
3374 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3378 n->status.blacklisted = true;
3380 /* Immediately shut down any connections we have with the blacklisted node.
3381 * We can't call terminate_connection(), because we might be called from a callback function.
3383 for list_each(connection_t, c, mesh->connections) {
3385 shutdown(c->socket, SHUT_RDWR);
3389 utcp_abort_all_connections(n->utcp);
3395 n->status.udp_confirmed = false;
3397 if(n->status.reachable) {
3398 n->last_unreachable = time(NULL);
3401 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3402 * manually call the status callback if necessary.
3404 if(n->status.reachable && mesh->node_status_cb) {
3405 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3408 return node_write_config(mesh, n) && config_sync(mesh, "current");
3411 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3412 if(!mesh || !node) {
3413 meshlink_errno = MESHLINK_EINVAL;
3417 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3421 if(!blacklist(mesh, (node_t *)node)) {
3422 pthread_mutex_unlock(&mesh->mutex);
3426 pthread_mutex_unlock(&mesh->mutex);
3428 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3432 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3433 if(!mesh || !name) {
3434 meshlink_errno = MESHLINK_EINVAL;
3438 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3442 node_t *n = lookup_node(mesh, (char *)name);
3446 n->name = xstrdup(name);
3450 if(!blacklist(mesh, (node_t *)n)) {
3451 pthread_mutex_unlock(&mesh->mutex);
3455 pthread_mutex_unlock(&mesh->mutex);
3457 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3461 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3462 if(n == mesh->self) {
3463 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3464 meshlink_errno = MESHLINK_EINVAL;
3468 if(!n->status.blacklisted) {
3469 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3473 n->status.blacklisted = false;
3475 if(n->status.reachable) {
3476 n->last_reachable = time(NULL);
3477 update_node_status(mesh, n);
3480 return node_write_config(mesh, n) && config_sync(mesh, "current");
3483 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3484 if(!mesh || !node) {
3485 meshlink_errno = MESHLINK_EINVAL;
3489 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3493 if(!whitelist(mesh, (node_t *)node)) {
3494 pthread_mutex_unlock(&mesh->mutex);
3498 pthread_mutex_unlock(&mesh->mutex);
3500 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3504 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3505 if(!mesh || !name) {
3506 meshlink_errno = MESHLINK_EINVAL;
3510 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3514 node_t *n = lookup_node(mesh, (char *)name);
3518 n->name = xstrdup(name);
3522 if(!whitelist(mesh, (node_t *)n)) {
3523 pthread_mutex_unlock(&mesh->mutex);
3527 pthread_mutex_unlock(&mesh->mutex);
3529 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3533 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3534 mesh->default_blacklist = blacklist;
3537 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3538 if(!mesh || !node) {
3539 meshlink_errno = MESHLINK_EINVAL;
3543 node_t *n = (node_t *)node;
3545 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3549 /* Check that the node is not reachable */
3550 if(n->status.reachable || n->connection) {
3551 pthread_mutex_unlock(&mesh->mutex);
3552 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3556 /* Check that we don't have any active UTCP connections */
3557 if(n->utcp && utcp_is_active(n->utcp)) {
3558 pthread_mutex_unlock(&mesh->mutex);
3559 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3563 /* Check that we have no active connections to this node */
3564 for list_each(connection_t, c, mesh->connections) {
3566 pthread_mutex_unlock(&mesh->mutex);
3567 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3572 /* Remove any pending outgoings to this node */
3573 if(mesh->outgoings) {
3574 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3575 if(outgoing->node == n) {
3576 list_delete_node(mesh->outgoings, list_node);
3581 /* Delete the config file for this node */
3582 if(!config_delete(mesh, "current", n->name)) {
3583 pthread_mutex_unlock(&mesh->mutex);
3587 /* Delete the node struct and any remaining edges referencing this node */
3590 pthread_mutex_unlock(&mesh->mutex);
3592 return config_sync(mesh, "current");
3595 /* Hint that a hostname may be found at an address
3596 * See header file for detailed comment.
3598 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3599 if(!mesh || !node || !addr) {
3600 meshlink_errno = EINVAL;
3604 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3608 node_t *n = (node_t *)node;
3610 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3611 if(!node_write_config(mesh, n)) {
3612 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3616 pthread_mutex_unlock(&mesh->mutex);
3617 // @TODO do we want to fire off a connection attempt right away?
3620 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3622 node_t *n = utcp->priv;
3623 meshlink_handle_t *mesh = n->mesh;
3624 return mesh->channel_accept_cb;
3627 /* Finish one AIO buffer, return true if the channel is still open. */
3628 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3629 meshlink_aio_buffer_t *aio = *head;
3633 channel->in_callback = true;
3636 if(aio->cb.buffer) {
3637 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3641 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3645 channel->in_callback = false;
3658 /* Finish all AIO buffers, return true if the channel is still open. */
3659 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3661 if(!aio_finish_one(mesh, channel, head)) {
3669 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3670 meshlink_channel_t *channel = connection->priv;
3676 node_t *n = channel->node;
3677 meshlink_handle_t *mesh = n->mesh;
3679 if(n->status.destroyed) {
3680 meshlink_channel_close(mesh, channel);
3684 const char *p = data;
3687 while(channel->aio_receive) {
3689 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3690 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3697 meshlink_aio_buffer_t *aio = channel->aio_receive;
3698 size_t todo = aio->len - aio->done;
3705 memcpy((char *)aio->data + aio->done, p, todo);
3707 ssize_t result = write(aio->fd, p, todo);
3710 if(result < 0 && errno == EINTR) {
3714 /* Writing to fd failed, cancel just this AIO buffer. */
3715 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3717 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3731 if(aio->done == aio->len) {
3732 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3742 if(channel->receive_cb) {
3743 channel->receive_cb(mesh, channel, p, left);
3749 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3750 node_t *n = utcp_connection->utcp->priv;
3756 meshlink_handle_t *mesh = n->mesh;
3758 if(!mesh->channel_accept_cb) {
3762 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3764 channel->c = utcp_connection;
3766 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3767 utcp_accept(utcp_connection, channel_recv, channel);
3773 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3774 node_t *n = utcp_connection->utcp->priv;
3775 meshlink_handle_t *mesh = n->mesh;
3777 if(n->mtuprobes == 31) {
3778 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3784 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3785 node_t *n = utcp->priv;
3787 if(n->status.destroyed) {
3791 meshlink_handle_t *mesh = n->mesh;
3792 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3795 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3796 if(!mesh || !channel) {
3797 meshlink_errno = MESHLINK_EINVAL;
3801 channel->receive_cb = cb;
3804 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3806 node_t *n = (node_t *)source;
3812 utcp_recv(n->utcp, data, len);
3815 static void channel_poll(struct utcp_connection *connection, size_t len) {
3816 meshlink_channel_t *channel = connection->priv;
3822 node_t *n = channel->node;
3823 meshlink_handle_t *mesh = n->mesh;
3825 while(channel->aio_send) {
3827 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3828 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3835 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3836 meshlink_aio_buffer_t *aio = channel->aio_send;
3837 size_t todo = aio->len - aio->done;
3845 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3847 /* Limit the amount we read at once to avoid stack overflows */
3853 ssize_t result = read(aio->fd, buf, todo);
3857 sent = utcp_send(connection, buf, todo);
3859 if(result < 0 && errno == EINTR) {
3863 /* Reading from fd failed, cancel just this AIO buffer. */
3865 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3868 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3876 if(sent != (ssize_t)todo) {
3877 /* We should never get a partial send at this point */
3880 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3881 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3892 /* If we didn't finish this buffer, exit early. */
3893 if(aio->done < aio->len) {
3897 /* Signal completion of this buffer, and go to the next one. */
3898 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3907 if(channel->poll_cb) {
3908 channel->poll_cb(mesh, channel, len);
3910 utcp_set_poll_cb(connection, NULL);
3914 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3915 if(!mesh || !channel) {
3916 meshlink_errno = MESHLINK_EINVAL;
3920 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3924 channel->poll_cb = cb;
3925 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3926 pthread_mutex_unlock(&mesh->mutex);
3929 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3931 meshlink_errno = MESHLINK_EINVAL;
3935 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3939 mesh->channel_accept_cb = cb;
3940 mesh->receive_cb = channel_receive;
3942 for splay_each(node_t, n, mesh->nodes) {
3943 if(!n->utcp && n != mesh->self) {
3944 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3945 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3946 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3950 pthread_mutex_unlock(&mesh->mutex);
3953 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3957 meshlink_errno = MESHLINK_EINVAL;
3961 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3965 utcp_set_sndbuf(channel->c, size);
3966 pthread_mutex_unlock(&mesh->mutex);
3969 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3973 meshlink_errno = MESHLINK_EINVAL;
3977 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3981 utcp_set_rcvbuf(channel->c, size);
3982 pthread_mutex_unlock(&mesh->mutex);
3985 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) {
3987 abort(); // TODO: handle non-NULL data
3990 if(!mesh || !node) {
3991 meshlink_errno = MESHLINK_EINVAL;
3995 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3999 node_t *n = (node_t *)node;
4002 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4003 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4004 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4005 mesh->receive_cb = channel_receive;
4008 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4009 pthread_mutex_unlock(&mesh->mutex);
4014 if(n->status.blacklisted) {
4015 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
4016 meshlink_errno = MESHLINK_EBLACKLISTED;
4017 pthread_mutex_unlock(&mesh->mutex);
4021 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4023 channel->receive_cb = cb;
4026 channel->priv = (void *)data;
4029 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
4031 pthread_mutex_unlock(&mesh->mutex);
4034 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4042 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) {
4043 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4046 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4047 if(!mesh || !channel) {
4048 meshlink_errno = MESHLINK_EINVAL;
4052 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4056 utcp_shutdown(channel->c, direction);
4057 pthread_mutex_unlock(&mesh->mutex);
4060 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4061 if(!mesh || !channel) {
4062 meshlink_errno = MESHLINK_EINVAL;
4066 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4071 utcp_close(channel->c);
4074 /* Clean up any outstanding AIO buffers. */
4075 aio_abort(mesh, channel, &channel->aio_send);
4076 aio_abort(mesh, channel, &channel->aio_receive);
4079 if(!channel->in_callback) {
4083 pthread_mutex_unlock(&mesh->mutex);
4086 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4087 if(!mesh || !channel) {
4088 meshlink_errno = MESHLINK_EINVAL;
4097 meshlink_errno = MESHLINK_EINVAL;
4101 // TODO: more finegrained locking.
4102 // Ideally we want to put the data into the UTCP connection's send buffer.
4103 // Then, preferably only if there is room in the receiver window,
4104 // kick the meshlink thread to go send packets.
4108 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4112 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4113 if(channel->aio_send) {
4116 retval = utcp_send(channel->c, data, len);
4119 pthread_mutex_unlock(&mesh->mutex);
4122 meshlink_errno = MESHLINK_ENETWORK;
4128 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) {
4129 if(!mesh || !channel) {
4130 meshlink_errno = MESHLINK_EINVAL;
4135 meshlink_errno = MESHLINK_EINVAL;
4139 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4142 aio->cb.buffer = cb;
4145 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4149 /* Append the AIO buffer descriptor to the end of the chain */
4150 meshlink_aio_buffer_t **p = &channel->aio_send;
4158 /* Ensure the poll callback is set, and call it right now to push data if possible */
4159 utcp_set_poll_cb(channel->c, channel_poll);
4160 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4163 channel_poll(channel->c, todo);
4166 pthread_mutex_unlock(&mesh->mutex);
4171 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) {
4172 if(!mesh || !channel) {
4173 meshlink_errno = MESHLINK_EINVAL;
4177 if(!len || fd == -1) {
4178 meshlink_errno = MESHLINK_EINVAL;
4182 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4188 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4192 /* Append the AIO buffer descriptor to the end of the chain */
4193 meshlink_aio_buffer_t **p = &channel->aio_send;
4201 /* Ensure the poll callback is set, and call it right now to push data if possible */
4202 utcp_set_poll_cb(channel->c, channel_poll);
4203 size_t left = utcp_get_rcvbuf_free(channel->c);
4206 channel_poll(channel->c, left);
4209 pthread_mutex_unlock(&mesh->mutex);
4214 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) {
4215 if(!mesh || !channel) {
4216 meshlink_errno = MESHLINK_EINVAL;
4221 meshlink_errno = MESHLINK_EINVAL;
4225 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4228 aio->cb.buffer = cb;
4231 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4235 /* Append the AIO buffer descriptor to the end of the chain */
4236 meshlink_aio_buffer_t **p = &channel->aio_receive;
4244 pthread_mutex_unlock(&mesh->mutex);
4249 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) {
4250 if(!mesh || !channel) {
4251 meshlink_errno = MESHLINK_EINVAL;
4255 if(!len || fd == -1) {
4256 meshlink_errno = MESHLINK_EINVAL;
4260 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4266 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4270 /* Append the AIO buffer descriptor to the end of the chain */
4271 meshlink_aio_buffer_t **p = &channel->aio_receive;
4279 pthread_mutex_unlock(&mesh->mutex);
4284 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4285 if(!mesh || !channel) {
4286 meshlink_errno = MESHLINK_EINVAL;
4290 return channel->c->flags;
4293 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4294 if(!mesh || !channel) {
4295 meshlink_errno = MESHLINK_EINVAL;
4299 return utcp_get_sendq(channel->c);
4302 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4303 if(!mesh || !channel) {
4304 meshlink_errno = MESHLINK_EINVAL;
4308 return utcp_get_recvq(channel->c);
4311 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4312 if(!mesh || !channel) {
4313 meshlink_errno = MESHLINK_EINVAL;
4317 return utcp_get_mss(channel->node->utcp);
4320 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4321 if(!mesh || !node) {
4322 meshlink_errno = MESHLINK_EINVAL;
4326 node_t *n = (node_t *)node;
4328 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4333 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4334 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4335 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4338 utcp_set_user_timeout(n->utcp, timeout);
4340 pthread_mutex_unlock(&mesh->mutex);
4343 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4344 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4345 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4346 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4347 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4350 if(mesh->node_status_cb) {
4351 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4354 if(mesh->node_pmtu_cb) {
4355 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4359 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4360 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4362 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4363 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4367 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4368 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4372 n->status.duplicate = true;
4373 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4376 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4380 meshlink_errno = MESHLINK_EINVAL;
4384 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4388 if(mesh->discovery == enable) {
4392 if(mesh->threadstarted) {
4394 discovery_start(mesh);
4396 discovery_stop(mesh);
4400 mesh->discovery = enable;
4403 pthread_mutex_unlock(&mesh->mutex);
4407 meshlink_errno = MESHLINK_ENOTSUP;
4411 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4412 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4413 meshlink_errno = EINVAL;
4417 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4418 meshlink_errno = EINVAL;
4422 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4426 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4427 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4428 pthread_mutex_unlock(&mesh->mutex);
4431 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4432 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4433 meshlink_errno = EINVAL;
4437 if(fast_retry_period < 0) {
4438 meshlink_errno = EINVAL;
4442 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4446 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4447 pthread_mutex_unlock(&mesh->mutex);
4450 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4451 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4452 meshlink_errno = EINVAL;
4456 if(maxtimeout < 0) {
4457 meshlink_errno = EINVAL;
4461 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4465 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4466 pthread_mutex_unlock(&mesh->mutex);
4469 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4474 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4478 handle_network_change(mesh, true);
4479 pthread_mutex_unlock(&mesh->mutex);
4482 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4484 meshlink_errno = EINVAL;
4488 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4492 mesh->inviter_commits_first = inviter_commits_first;
4493 pthread_mutex_unlock(&mesh->mutex);
4496 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4498 meshlink_errno = EINVAL;
4502 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4503 meshlink_errno = EINVAL;
4507 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4511 free(mesh->external_address_url);
4512 mesh->external_address_url = url ? xstrdup(url) : NULL;
4513 pthread_mutex_unlock(&mesh->mutex);
4516 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4517 if(!mesh || granularity < 0) {
4518 meshlink_errno = EINVAL;
4522 utcp_set_clock_granularity(granularity);
4525 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4528 if(!mesh->connections || !mesh->loop.running) {
4533 signal_trigger(&mesh->loop, &mesh->datafromapp);
4536 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4537 // We should only call the callback function if we are in the background thread.
4538 if(!mesh->error_cb) {
4542 if(!mesh->threadstarted) {
4546 if(mesh->thread == pthread_self()) {
4547 mesh->error_cb(mesh, cb_errno);
4551 static void __attribute__((constructor)) meshlink_init(void) {
4553 utcp_set_clock_granularity(10000);
4556 static void __attribute__((destructor)) meshlink_exit(void) {