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") || (mesh->confbase && !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 // Reset node connection timers
1717 for splay_each(node_t, n, mesh->nodes) {
1718 n->last_connect_try = 0;
1721 // TODO: open listening sockets first
1723 //Check that a valid name is set
1725 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1726 meshlink_errno = MESHLINK_EINVAL;
1727 pthread_mutex_unlock(&mesh->mutex);
1731 init_outgoings(mesh);
1734 // Start the main thread
1736 event_loop_start(&mesh->loop);
1738 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1739 pthread_attr_t attr;
1740 pthread_attr_init(&attr);
1741 pthread_attr_setstacksize(&attr, 1024 * 1024);
1743 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1744 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1745 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1746 meshlink_errno = MESHLINK_EINTERNAL;
1747 event_loop_stop(&mesh->loop);
1748 pthread_mutex_unlock(&mesh->mutex);
1752 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1753 mesh->threadstarted = true;
1755 // Ensure we are considered reachable
1758 pthread_mutex_unlock(&mesh->mutex);
1762 void meshlink_stop(meshlink_handle_t *mesh) {
1764 meshlink_errno = MESHLINK_EINVAL;
1768 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1772 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1774 // Shut down the main thread
1775 event_loop_stop(&mesh->loop);
1777 // Send ourselves a UDP packet to kick the event loop
1778 for(int i = 0; i < mesh->listen_sockets; i++) {
1780 socklen_t salen = sizeof(sa);
1782 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1783 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1787 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1788 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1792 if(mesh->threadstarted) {
1793 // Wait for the main thread to finish
1794 pthread_mutex_unlock(&mesh->mutex);
1796 if(pthread_join(mesh->thread, NULL) != 0) {
1800 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1804 mesh->threadstarted = false;
1807 // Close all metaconnections
1808 if(mesh->connections) {
1809 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1811 connection_t *c = node->data;
1813 terminate_connection(mesh, c, false);
1818 exit_outgoings(mesh);
1820 // Ensure we are considered unreachable
1825 // Try to write out any changed node config files, ignore errors at this point.
1827 for splay_each(node_t, n, mesh->nodes) {
1828 if(n->status.dirty) {
1829 n->status.dirty = !node_write_config(mesh, n);
1834 pthread_mutex_unlock(&mesh->mutex);
1837 void meshlink_close(meshlink_handle_t *mesh) {
1839 meshlink_errno = MESHLINK_EINVAL;
1843 // stop can be called even if mesh has not been started
1844 meshlink_stop(mesh);
1846 // lock is not released after this
1847 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1851 // Close and free all resources used.
1853 close_network_connections(mesh);
1855 logger(mesh, MESHLINK_INFO, "Terminating");
1857 event_loop_exit(&mesh->loop);
1861 if(mesh->confbase) {
1867 ecdsa_free(mesh->invitation_key);
1869 if(mesh->netns != -1) {
1873 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1877 meshlink_queue_exit(&mesh->outpacketqueue);
1880 free(mesh->appname);
1881 free(mesh->confbase);
1882 free(mesh->config_key);
1883 free(mesh->external_address_url);
1885 ecdsa_free(mesh->private_key);
1887 if(mesh->invitation_addresses) {
1888 list_delete_list(mesh->invitation_addresses);
1891 main_config_unlock(mesh);
1893 pthread_mutex_unlock(&mesh->mutex);
1894 pthread_mutex_destroy(&mesh->mutex);
1896 memset(mesh, 0, sizeof(*mesh));
1901 bool meshlink_destroy(const char *confbase) {
1903 meshlink_errno = MESHLINK_EINVAL;
1907 /* Exit early if the confbase directory itself doesn't exist */
1908 if(access(confbase, F_OK) && errno == ENOENT) {
1912 /* Take the lock the same way meshlink_open() would. */
1913 char lockfilename[PATH_MAX];
1914 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1916 FILE *lockfile = fopen(lockfilename, "w+");
1919 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1920 meshlink_errno = MESHLINK_ESTORAGE;
1925 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1929 // TODO: use _locking()?
1932 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1933 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1935 meshlink_errno = MESHLINK_EBUSY;
1941 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1942 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1946 if(unlink(lockfilename)) {
1947 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1949 meshlink_errno = MESHLINK_ESTORAGE;
1955 if(!sync_path(confbase)) {
1956 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1957 meshlink_errno = MESHLINK_ESTORAGE;
1964 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1966 meshlink_errno = MESHLINK_EINVAL;
1970 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1974 mesh->receive_cb = cb;
1975 pthread_mutex_unlock(&mesh->mutex);
1978 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1980 meshlink_errno = MESHLINK_EINVAL;
1984 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1988 mesh->connection_try_cb = cb;
1989 pthread_mutex_unlock(&mesh->mutex);
1992 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1994 meshlink_errno = MESHLINK_EINVAL;
1998 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2002 mesh->node_status_cb = cb;
2003 pthread_mutex_unlock(&mesh->mutex);
2006 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
2008 meshlink_errno = MESHLINK_EINVAL;
2012 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2016 mesh->node_pmtu_cb = cb;
2017 pthread_mutex_unlock(&mesh->mutex);
2020 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
2022 meshlink_errno = MESHLINK_EINVAL;
2026 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2030 mesh->node_duplicate_cb = cb;
2031 pthread_mutex_unlock(&mesh->mutex);
2034 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
2036 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2041 mesh->log_level = cb ? level : 0;
2042 pthread_mutex_unlock(&mesh->mutex);
2045 global_log_level = cb ? level : 0;
2049 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2051 meshlink_errno = MESHLINK_EINVAL;
2055 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2059 mesh->error_cb = cb;
2060 pthread_mutex_unlock(&mesh->mutex);
2063 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2064 meshlink_packethdr_t *hdr;
2066 if(len > MAXSIZE - sizeof(*hdr)) {
2067 meshlink_errno = MESHLINK_EINVAL;
2071 node_t *n = (node_t *)destination;
2073 if(n->status.blacklisted) {
2074 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2075 meshlink_errno = MESHLINK_EBLACKLISTED;
2079 // Prepare the packet
2080 packet->probe = false;
2081 packet->tcp = false;
2082 packet->len = len + sizeof(*hdr);
2084 hdr = (meshlink_packethdr_t *)packet->data;
2085 memset(hdr, 0, sizeof(*hdr));
2086 // leave the last byte as 0 to make sure strings are always
2087 // null-terminated if they are longer than the buffer
2088 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2089 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2091 memcpy(packet->data + sizeof(*hdr), data, len);
2096 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2098 assert(destination);
2102 // Prepare the packet
2103 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2107 // Send it immediately
2108 route(mesh, mesh->self, mesh->packet);
2113 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2114 // Validate arguments
2115 if(!mesh || !destination) {
2116 meshlink_errno = MESHLINK_EINVAL;
2125 meshlink_errno = MESHLINK_EINVAL;
2129 // Prepare the packet
2130 vpn_packet_t *packet = malloc(sizeof(*packet));
2133 meshlink_errno = MESHLINK_ENOMEM;
2137 if(!prepare_packet(mesh, destination, data, len, packet)) {
2143 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2145 meshlink_errno = MESHLINK_ENOMEM;
2149 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2151 // Notify event loop
2152 signal_trigger(&mesh->loop, &mesh->datafromapp);
2157 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2159 meshlink_handle_t *mesh = data;
2161 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2163 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2164 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2165 mesh->self->in_packets++;
2166 mesh->self->in_bytes += packet->len;
2167 route(mesh, mesh->self, packet);
2172 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2173 if(!mesh || !destination) {
2174 meshlink_errno = MESHLINK_EINVAL;
2178 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2182 node_t *n = (node_t *)destination;
2184 if(!n->status.reachable) {
2185 pthread_mutex_unlock(&mesh->mutex);
2188 } else if(n->mtuprobes > 30 && n->minmtu) {
2189 pthread_mutex_unlock(&mesh->mutex);
2192 pthread_mutex_unlock(&mesh->mutex);
2197 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2198 if(!mesh || !node) {
2199 meshlink_errno = MESHLINK_EINVAL;
2203 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2207 node_t *n = (node_t *)node;
2209 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2210 meshlink_errno = MESHLINK_EINTERNAL;
2211 pthread_mutex_unlock(&mesh->mutex);
2215 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2218 meshlink_errno = MESHLINK_EINTERNAL;
2221 pthread_mutex_unlock(&mesh->mutex);
2225 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2227 meshlink_errno = MESHLINK_EINVAL;
2231 return (meshlink_node_t *)mesh->self;
2234 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2235 if(!mesh || !name) {
2236 meshlink_errno = MESHLINK_EINVAL;
2242 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2246 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2247 pthread_mutex_unlock(&mesh->mutex);
2250 meshlink_errno = MESHLINK_ENOENT;
2253 return (meshlink_node_t *)n;
2256 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2257 if(!mesh || !name) {
2258 meshlink_errno = MESHLINK_EINVAL;
2262 meshlink_submesh_t *submesh = NULL;
2264 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2268 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2269 pthread_mutex_unlock(&mesh->mutex);
2272 meshlink_errno = MESHLINK_ENOENT;
2278 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2279 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2280 meshlink_errno = MESHLINK_EINVAL;
2284 meshlink_node_t **result;
2287 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2291 *nmemb = mesh->nodes->count;
2292 result = realloc(nodes, *nmemb * sizeof(*nodes));
2295 meshlink_node_t **p = result;
2297 for splay_each(node_t, n, mesh->nodes) {
2298 *p++ = (meshlink_node_t *)n;
2303 meshlink_errno = MESHLINK_ENOMEM;
2306 pthread_mutex_unlock(&mesh->mutex);
2311 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) {
2312 meshlink_node_t **result;
2314 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2320 for splay_each(node_t, n, mesh->nodes) {
2321 if(search_node(n, condition)) {
2328 pthread_mutex_unlock(&mesh->mutex);
2332 result = realloc(nodes, *nmemb * sizeof(*nodes));
2335 meshlink_node_t **p = result;
2337 for splay_each(node_t, n, mesh->nodes) {
2338 if(search_node(n, condition)) {
2339 *p++ = (meshlink_node_t *)n;
2345 meshlink_errno = MESHLINK_ENOMEM;
2348 pthread_mutex_unlock(&mesh->mutex);
2353 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2354 dev_class_t *devclass = (dev_class_t *)condition;
2356 if(*devclass == (dev_class_t)node->devclass) {
2363 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2364 if(condition == node->submesh) {
2376 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2377 const struct time_range *range = condition;
2378 time_t start = node->last_reachable;
2379 time_t end = node->last_unreachable;
2389 if(range->end >= range->start) {
2390 return start <= range->end && end >= range->start;
2392 return start > range->start || end < range->end;
2396 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) {
2397 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2398 meshlink_errno = MESHLINK_EINVAL;
2402 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2405 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2406 if(!mesh || !submesh || !nmemb) {
2407 meshlink_errno = MESHLINK_EINVAL;
2411 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2414 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) {
2415 if(!mesh || !nmemb) {
2416 meshlink_errno = MESHLINK_EINVAL;
2420 struct time_range range = {start, end};
2422 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2425 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2426 if(!mesh || !node) {
2427 meshlink_errno = MESHLINK_EINVAL;
2431 dev_class_t devclass;
2433 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2437 devclass = ((node_t *)node)->devclass;
2439 pthread_mutex_unlock(&mesh->mutex);
2444 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2445 if(!mesh || !node) {
2446 meshlink_errno = MESHLINK_EINVAL;
2450 node_t *n = (node_t *)node;
2452 meshlink_submesh_t *s;
2454 s = (meshlink_submesh_t *)n->submesh;
2459 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2460 if(!mesh || !node) {
2461 meshlink_errno = MESHLINK_EINVAL;
2465 node_t *n = (node_t *)node;
2468 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2472 reachable = n->status.reachable && !n->status.blacklisted;
2474 if(last_reachable) {
2475 *last_reachable = n->last_reachable;
2478 if(last_unreachable) {
2479 *last_unreachable = n->last_unreachable;
2482 pthread_mutex_unlock(&mesh->mutex);
2487 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2488 if(!mesh || !data || !len || !signature || !siglen) {
2489 meshlink_errno = MESHLINK_EINVAL;
2493 if(*siglen < MESHLINK_SIGLEN) {
2494 meshlink_errno = MESHLINK_EINVAL;
2498 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2502 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2503 meshlink_errno = MESHLINK_EINTERNAL;
2504 pthread_mutex_unlock(&mesh->mutex);
2508 *siglen = MESHLINK_SIGLEN;
2509 pthread_mutex_unlock(&mesh->mutex);
2513 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2514 if(!mesh || !source || !data || !len || !signature) {
2515 meshlink_errno = MESHLINK_EINVAL;
2519 if(siglen != MESHLINK_SIGLEN) {
2520 meshlink_errno = MESHLINK_EINVAL;
2524 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2530 struct node_t *n = (struct node_t *)source;
2532 if(!node_read_public_key(mesh, n)) {
2533 meshlink_errno = MESHLINK_EINTERNAL;
2536 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2539 pthread_mutex_unlock(&mesh->mutex);
2543 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2544 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2548 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2551 // TODO: Update invitation key if necessary?
2554 pthread_mutex_unlock(&mesh->mutex);
2556 return mesh->invitation_key;
2559 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2560 if(!mesh || !node || !address) {
2561 meshlink_errno = MESHLINK_EINVAL;
2565 if(!is_valid_hostname(address)) {
2566 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2567 meshlink_errno = MESHLINK_EINVAL;
2571 if((node_t *)node != mesh->self && !port) {
2572 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2573 meshlink_errno = MESHLINK_EINVAL;
2578 if(port && !is_valid_port(port)) {
2579 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2580 meshlink_errno = MESHLINK_EINVAL;
2584 char *canonical_address;
2586 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2588 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2592 node_t *n = (node_t *)node;
2593 free(n->canonical_address);
2594 n->canonical_address = canonical_address;
2596 if(!node_write_config(mesh, n)) {
2597 pthread_mutex_unlock(&mesh->mutex);
2601 pthread_mutex_unlock(&mesh->mutex);
2603 return config_sync(mesh, "current");
2606 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2607 if(!mesh || !address) {
2608 meshlink_errno = MESHLINK_EINVAL;
2612 if(!is_valid_hostname(address)) {
2613 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2614 meshlink_errno = MESHLINK_EINVAL;
2618 if(port && !is_valid_port(port)) {
2619 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2620 meshlink_errno = MESHLINK_EINVAL;
2627 xasprintf(&combo, "%s/%s", address, port);
2629 combo = xstrdup(address);
2632 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2636 if(!mesh->invitation_addresses) {
2637 mesh->invitation_addresses = list_alloc((list_action_t)free);
2640 list_insert_tail(mesh->invitation_addresses, combo);
2641 pthread_mutex_unlock(&mesh->mutex);
2646 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2648 meshlink_errno = MESHLINK_EINVAL;
2652 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2656 if(mesh->invitation_addresses) {
2657 list_delete_list(mesh->invitation_addresses);
2658 mesh->invitation_addresses = NULL;
2661 pthread_mutex_unlock(&mesh->mutex);
2664 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2665 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2668 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2670 meshlink_errno = MESHLINK_EINVAL;
2674 char *address = meshlink_get_external_address(mesh);
2680 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2686 int meshlink_get_port(meshlink_handle_t *mesh) {
2688 meshlink_errno = MESHLINK_EINVAL;
2693 meshlink_errno = MESHLINK_EINTERNAL;
2699 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2703 port = atoi(mesh->myport);
2704 pthread_mutex_unlock(&mesh->mutex);
2709 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2710 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2711 meshlink_errno = MESHLINK_EINVAL;
2715 if(mesh->myport && port == atoi(mesh->myport)) {
2719 if(!try_bind(mesh, port)) {
2720 meshlink_errno = MESHLINK_ENETWORK;
2724 devtool_trybind_probe();
2728 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2732 if(mesh->threadstarted) {
2733 meshlink_errno = MESHLINK_EINVAL;
2738 xasprintf(&mesh->myport, "%d", port);
2740 /* Close down the network. This also deletes mesh->self. */
2741 close_network_connections(mesh);
2743 /* Recreate mesh->self. */
2744 mesh->self = new_node();
2745 mesh->self->name = xstrdup(mesh->name);
2746 mesh->self->devclass = mesh->devclass;
2747 mesh->self->session_id = mesh->session_id;
2748 xasprintf(&mesh->myport, "%d", port);
2750 if(!node_read_public_key(mesh, mesh->self)) {
2751 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2752 meshlink_errno = MESHLINK_ESTORAGE;
2753 free_node(mesh->self);
2756 } else if(!setup_network(mesh)) {
2757 meshlink_errno = MESHLINK_ENETWORK;
2761 /* Rebuild our own list of recent addresses */
2762 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2763 add_local_addresses(mesh);
2765 /* Write meshlink.conf with the updated port number */
2766 write_main_config_files(mesh);
2768 rval = config_sync(mesh, "current");
2771 pthread_mutex_unlock(&mesh->mutex);
2773 return rval && meshlink_get_port(mesh) == port;
2776 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2777 mesh->invitation_timeout = timeout;
2780 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2781 meshlink_submesh_t *s = NULL;
2784 meshlink_errno = MESHLINK_EINVAL;
2789 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2792 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2793 meshlink_errno = MESHLINK_EINVAL;
2797 s = (meshlink_submesh_t *)mesh->self->submesh;
2800 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2804 // Check validity of the new node's name
2805 if(!check_id(name)) {
2806 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2807 meshlink_errno = MESHLINK_EINVAL;
2808 pthread_mutex_unlock(&mesh->mutex);
2812 // Ensure no host configuration file with that name exists
2813 if(config_exists(mesh, "current", name)) {
2814 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2815 meshlink_errno = MESHLINK_EEXIST;
2816 pthread_mutex_unlock(&mesh->mutex);
2820 // Ensure no other nodes know about this name
2821 if(lookup_node(mesh, name)) {
2822 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2823 meshlink_errno = MESHLINK_EEXIST;
2824 pthread_mutex_unlock(&mesh->mutex);
2828 // Get the local address
2829 char *address = get_my_hostname(mesh, flags);
2832 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2833 meshlink_errno = MESHLINK_ERESOLV;
2834 pthread_mutex_unlock(&mesh->mutex);
2838 if(!refresh_invitation_key(mesh)) {
2839 meshlink_errno = MESHLINK_EINTERNAL;
2840 pthread_mutex_unlock(&mesh->mutex);
2844 // If we changed our own host config file, write it out now
2845 if(mesh->self->status.dirty) {
2846 if(!node_write_config(mesh, mesh->self)) {
2847 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2848 pthread_mutex_unlock(&mesh->mutex);
2855 // Create a hash of the key.
2856 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2857 sha512(fingerprint, strlen(fingerprint), hash);
2858 b64encode_urlsafe(hash, hash, 18);
2860 // Create a random cookie for this invitation.
2862 randomize(cookie, 18);
2864 // Create a filename that doesn't reveal the cookie itself
2865 char buf[18 + strlen(fingerprint)];
2866 char cookiehash[64];
2867 memcpy(buf, cookie, 18);
2868 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2869 sha512(buf, sizeof(buf), cookiehash);
2870 b64encode_urlsafe(cookiehash, cookiehash, 18);
2872 b64encode_urlsafe(cookie, cookie, 18);
2876 /* Construct the invitation file */
2877 uint8_t outbuf[4096];
2878 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2880 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2881 packmsg_add_str(&inv, name);
2882 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2883 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2885 /* TODO: Add several host config files to bootstrap connections.
2886 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2887 * and are not blacklisted.
2889 config_t configs[5];
2890 memset(configs, 0, sizeof(configs));
2893 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2897 /* Append host config files to the invitation file */
2898 packmsg_add_array(&inv, count);
2900 for(int i = 0; i < count; i++) {
2901 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2902 config_free(&configs[i]);
2905 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2907 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2908 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2909 meshlink_errno = MESHLINK_ESTORAGE;
2910 pthread_mutex_unlock(&mesh->mutex);
2914 // Create an URL from the local address, key hash and cookie
2916 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2919 pthread_mutex_unlock(&mesh->mutex);
2923 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2924 return meshlink_invite_ex(mesh, submesh, name, 0);
2927 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2928 if(!mesh || !invitation) {
2929 meshlink_errno = MESHLINK_EINVAL;
2933 join_state_t state = {
2938 ecdsa_t *key = NULL;
2939 ecdsa_t *hiskey = NULL;
2941 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2942 char copy[strlen(invitation) + 1];
2944 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2948 //Before doing meshlink_join make sure we are not connected to another mesh
2949 if(mesh->threadstarted) {
2950 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2951 meshlink_errno = MESHLINK_EINVAL;
2955 // 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.
2956 if(mesh->nodes->count > 1) {
2957 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2958 meshlink_errno = MESHLINK_EINVAL;
2962 strcpy(copy, invitation);
2964 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2966 char *slash = strchr(copy, '/');
2974 if(strlen(slash) != 48) {
2978 char *address = copy;
2981 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2985 if(mesh->inviter_commits_first) {
2986 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2989 // Generate a throw-away key for the invitation.
2990 key = ecdsa_generate();
2993 meshlink_errno = MESHLINK_EINTERNAL;
2997 char *b64key = ecdsa_get_base64_public_key(key);
3000 while(address && *address) {
3001 // We allow commas in the address part to support multiple addresses in one invitation URL.
3002 comma = strchr(address, ',');
3008 // Split of the port
3009 port = strrchr(address, ':');
3017 // IPv6 address are enclosed in brackets, per RFC 3986
3018 if(*address == '[') {
3020 char *bracket = strchr(address, ']');
3033 // Connect to the meshlink daemon mentioned in the URL.
3034 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 5);
3037 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
3038 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
3040 if(state.sock == -1) {
3041 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
3042 meshlink_errno = MESHLINK_ENETWORK;
3048 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3051 set_timeout(state.sock, 5000);
3053 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3054 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3055 meshlink_errno = MESHLINK_ENETWORK;
3056 closesocket(state.sock);
3066 meshlink_errno = MESHLINK_ERESOLV;
3069 if(state.sock != -1 || !comma) {
3076 if(state.sock == -1) {
3080 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3082 // Tell him we have an invitation, and give him our throw-away key.
3086 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3087 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3088 meshlink_errno = MESHLINK_ENETWORK;
3094 char hisname[4096] = "";
3095 int code, hismajor, hisminor = 0;
3097 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) {
3098 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
3099 meshlink_errno = MESHLINK_ENETWORK;
3103 // Check if the hash of the key he gave us matches the hash in the URL.
3104 char *fingerprint = state.line + 2;
3107 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3108 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
3109 meshlink_errno = MESHLINK_EINTERNAL;
3113 if(memcmp(hishash, state.hash, 18)) {
3114 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
3115 meshlink_errno = MESHLINK_EPEER;
3119 hiskey = ecdsa_set_base64_public_key(fingerprint);
3122 meshlink_errno = MESHLINK_EINTERNAL;
3126 // Start an SPTPS session
3127 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3128 meshlink_errno = MESHLINK_EINTERNAL;
3132 // Feed rest of input buffer to SPTPS
3133 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3134 meshlink_errno = MESHLINK_EPEER;
3139 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3141 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3143 if(errno == EINTR) {
3147 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3148 meshlink_errno = MESHLINK_ENETWORK;
3152 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3153 meshlink_errno = MESHLINK_EPEER;
3158 if(!state.success) {
3159 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3160 meshlink_errno = MESHLINK_EPEER;
3164 sptps_stop(&state.sptps);
3167 closesocket(state.sock);
3169 pthread_mutex_unlock(&mesh->mutex);
3173 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3174 meshlink_errno = MESHLINK_EINVAL;
3176 sptps_stop(&state.sptps);
3180 if(state.sock != -1) {
3181 closesocket(state.sock);
3184 pthread_mutex_unlock(&mesh->mutex);
3188 char *meshlink_export(meshlink_handle_t *mesh) {
3190 meshlink_errno = MESHLINK_EINVAL;
3194 // Create a config file on the fly.
3197 packmsg_output_t out = {buf, sizeof(buf)};
3198 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3199 packmsg_add_str(&out, mesh->name);
3200 packmsg_add_str(&out, CORE_MESH);
3202 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3206 packmsg_add_int32(&out, mesh->self->devclass);
3207 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3208 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3210 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3211 char *canonical_address = NULL;
3212 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3213 packmsg_add_str(&out, canonical_address);
3214 free(canonical_address);
3216 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3221 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3222 if(mesh->self->recent[i].sa.sa_family) {
3229 packmsg_add_array(&out, count);
3231 for(uint32_t i = 0; i < count; i++) {
3232 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3235 packmsg_add_int64(&out, 0);
3236 packmsg_add_int64(&out, 0);
3238 pthread_mutex_unlock(&mesh->mutex);
3240 if(!packmsg_output_ok(&out)) {
3241 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3242 meshlink_errno = MESHLINK_EINTERNAL;
3246 // Prepare a base64-encoded packmsg array containing our config file
3248 uint32_t len = packmsg_output_size(&out, buf);
3249 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3250 uint8_t *buf2 = xmalloc(len2);
3251 packmsg_output_t out2 = {buf2, len2};
3252 packmsg_add_array(&out2, 1);
3253 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3255 if(!packmsg_output_ok(&out2)) {
3256 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3257 meshlink_errno = MESHLINK_EINTERNAL;
3262 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3264 return (char *)buf2;
3267 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3268 if(!mesh || !data) {
3269 meshlink_errno = MESHLINK_EINVAL;
3273 size_t datalen = strlen(data);
3274 uint8_t *buf = xmalloc(datalen);
3275 int buflen = b64decode(data, buf, datalen);
3278 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3279 meshlink_errno = MESHLINK_EPEER;
3283 packmsg_input_t in = {buf, buflen};
3284 uint32_t count = packmsg_get_array(&in);
3287 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3288 meshlink_errno = MESHLINK_EPEER;
3292 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3298 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3304 packmsg_input_t in2 = {data2, len2};
3305 uint32_t version = packmsg_get_uint32(&in2);
3306 char *name = packmsg_get_str_dup(&in2);
3308 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3310 packmsg_input_invalidate(&in);
3314 if(!check_id(name)) {
3319 node_t *n = lookup_node(mesh, name);
3322 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3330 config_t config = {data2, len2};
3332 if(!node_read_from_config(mesh, n, &config)) {
3334 packmsg_input_invalidate(&in);
3338 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3339 n->last_reachable = 0;
3340 n->last_unreachable = 0;
3342 if(!node_write_config(mesh, n)) {
3350 pthread_mutex_unlock(&mesh->mutex);
3354 if(!packmsg_done(&in)) {
3355 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3356 meshlink_errno = MESHLINK_EPEER;
3360 if(!config_sync(mesh, "current")) {
3367 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3368 if(n == mesh->self) {
3369 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3370 meshlink_errno = MESHLINK_EINVAL;
3374 if(n->status.blacklisted) {
3375 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3379 n->status.blacklisted = true;
3381 /* Immediately shut down any connections we have with the blacklisted node.
3382 * We can't call terminate_connection(), because we might be called from a callback function.
3384 for list_each(connection_t, c, mesh->connections) {
3386 shutdown(c->socket, SHUT_RDWR);
3390 utcp_abort_all_connections(n->utcp);
3396 n->status.udp_confirmed = false;
3398 if(n->status.reachable) {
3399 n->last_unreachable = time(NULL);
3402 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3403 * manually call the status callback if necessary.
3405 if(n->status.reachable && mesh->node_status_cb) {
3406 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3409 return node_write_config(mesh, n) && config_sync(mesh, "current");
3412 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3413 if(!mesh || !node) {
3414 meshlink_errno = MESHLINK_EINVAL;
3418 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3422 if(!blacklist(mesh, (node_t *)node)) {
3423 pthread_mutex_unlock(&mesh->mutex);
3427 pthread_mutex_unlock(&mesh->mutex);
3429 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3433 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3434 if(!mesh || !name) {
3435 meshlink_errno = MESHLINK_EINVAL;
3439 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3443 node_t *n = lookup_node(mesh, (char *)name);
3447 n->name = xstrdup(name);
3451 if(!blacklist(mesh, (node_t *)n)) {
3452 pthread_mutex_unlock(&mesh->mutex);
3456 pthread_mutex_unlock(&mesh->mutex);
3458 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3462 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3463 if(n == mesh->self) {
3464 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3465 meshlink_errno = MESHLINK_EINVAL;
3469 if(!n->status.blacklisted) {
3470 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3474 n->status.blacklisted = false;
3476 if(n->status.reachable) {
3477 n->last_reachable = time(NULL);
3478 update_node_status(mesh, n);
3481 return node_write_config(mesh, n) && config_sync(mesh, "current");
3484 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3485 if(!mesh || !node) {
3486 meshlink_errno = MESHLINK_EINVAL;
3490 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3494 if(!whitelist(mesh, (node_t *)node)) {
3495 pthread_mutex_unlock(&mesh->mutex);
3499 pthread_mutex_unlock(&mesh->mutex);
3501 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3505 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3506 if(!mesh || !name) {
3507 meshlink_errno = MESHLINK_EINVAL;
3511 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3515 node_t *n = lookup_node(mesh, (char *)name);
3519 n->name = xstrdup(name);
3523 if(!whitelist(mesh, (node_t *)n)) {
3524 pthread_mutex_unlock(&mesh->mutex);
3528 pthread_mutex_unlock(&mesh->mutex);
3530 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3534 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3535 mesh->default_blacklist = blacklist;
3538 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3539 if(!mesh || !node) {
3540 meshlink_errno = MESHLINK_EINVAL;
3544 node_t *n = (node_t *)node;
3546 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3550 /* Check that the node is not reachable */
3551 if(n->status.reachable || n->connection) {
3552 pthread_mutex_unlock(&mesh->mutex);
3553 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3557 /* Check that we don't have any active UTCP connections */
3558 if(n->utcp && utcp_is_active(n->utcp)) {
3559 pthread_mutex_unlock(&mesh->mutex);
3560 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3564 /* Check that we have no active connections to this node */
3565 for list_each(connection_t, c, mesh->connections) {
3567 pthread_mutex_unlock(&mesh->mutex);
3568 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3573 /* Remove any pending outgoings to this node */
3574 if(mesh->outgoings) {
3575 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3576 if(outgoing->node == n) {
3577 list_delete_node(mesh->outgoings, list_node);
3582 /* Delete the config file for this node */
3583 if(!config_delete(mesh, "current", n->name)) {
3584 pthread_mutex_unlock(&mesh->mutex);
3588 /* Delete the node struct and any remaining edges referencing this node */
3591 pthread_mutex_unlock(&mesh->mutex);
3593 return config_sync(mesh, "current");
3596 /* Hint that a hostname may be found at an address
3597 * See header file for detailed comment.
3599 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3600 if(!mesh || !node || !addr) {
3601 meshlink_errno = EINVAL;
3605 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3609 node_t *n = (node_t *)node;
3611 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3612 if(!node_write_config(mesh, n)) {
3613 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3617 pthread_mutex_unlock(&mesh->mutex);
3618 // @TODO do we want to fire off a connection attempt right away?
3621 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3623 node_t *n = utcp->priv;
3624 meshlink_handle_t *mesh = n->mesh;
3626 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3627 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3629 return mesh->channel_accept_cb;
3633 /* Finish one AIO buffer, return true if the channel is still open. */
3634 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3635 meshlink_aio_buffer_t *aio = *head;
3639 channel->in_callback = true;
3642 if(aio->cb.buffer) {
3643 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3647 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3651 channel->in_callback = false;
3664 /* Finish all AIO buffers, return true if the channel is still open. */
3665 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3667 if(!aio_finish_one(mesh, channel, head)) {
3675 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3676 meshlink_channel_t *channel = connection->priv;
3682 node_t *n = channel->node;
3683 meshlink_handle_t *mesh = n->mesh;
3685 if(n->status.destroyed) {
3686 meshlink_channel_close(mesh, channel);
3690 const char *p = data;
3693 while(channel->aio_receive) {
3695 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3696 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3703 meshlink_aio_buffer_t *aio = channel->aio_receive;
3704 size_t todo = aio->len - aio->done;
3711 memcpy((char *)aio->data + aio->done, p, todo);
3713 ssize_t result = write(aio->fd, p, todo);
3716 if(result < 0 && errno == EINTR) {
3720 /* Writing to fd failed, cancel just this AIO buffer. */
3721 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3723 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3737 if(aio->done == aio->len) {
3738 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3748 if(channel->receive_cb) {
3749 channel->receive_cb(mesh, channel, p, left);
3755 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3756 node_t *n = utcp_connection->utcp->priv;
3762 meshlink_handle_t *mesh = n->mesh;
3764 if(!mesh->channel_accept_cb) {
3768 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3770 channel->c = utcp_connection;
3772 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3773 utcp_accept(utcp_connection, channel_recv, channel);
3779 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3780 node_t *n = utcp_connection->utcp->priv;
3781 meshlink_handle_t *mesh = n->mesh;
3783 if(n->mtuprobes == 31) {
3784 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3790 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3791 node_t *n = utcp->priv;
3793 if(n->status.destroyed) {
3797 meshlink_handle_t *mesh = n->mesh;
3798 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3801 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3802 if(!mesh || !channel) {
3803 meshlink_errno = MESHLINK_EINVAL;
3807 channel->receive_cb = cb;
3810 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3812 node_t *n = (node_t *)source;
3818 utcp_recv(n->utcp, data, len);
3821 static void channel_poll(struct utcp_connection *connection, size_t len) {
3822 meshlink_channel_t *channel = connection->priv;
3828 node_t *n = channel->node;
3829 meshlink_handle_t *mesh = n->mesh;
3831 while(channel->aio_send) {
3833 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3834 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3841 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3842 meshlink_aio_buffer_t *aio = channel->aio_send;
3843 size_t todo = aio->len - aio->done;
3851 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3853 /* Limit the amount we read at once to avoid stack overflows */
3859 ssize_t result = read(aio->fd, buf, todo);
3863 sent = utcp_send(connection, buf, todo);
3865 if(result < 0 && errno == EINTR) {
3869 /* Reading from fd failed, cancel just this AIO buffer. */
3871 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3874 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3882 if(sent != (ssize_t)todo) {
3883 /* We should never get a partial send at this point */
3886 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3887 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3898 /* If we didn't finish this buffer, exit early. */
3899 if(aio->done < aio->len) {
3903 /* Signal completion of this buffer, and go to the next one. */
3904 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3913 if(channel->poll_cb) {
3914 channel->poll_cb(mesh, channel, len);
3916 utcp_set_poll_cb(connection, NULL);
3920 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3921 if(!mesh || !channel) {
3922 meshlink_errno = MESHLINK_EINVAL;
3926 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3930 channel->poll_cb = cb;
3931 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3932 pthread_mutex_unlock(&mesh->mutex);
3935 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
3937 meshlink_errno = MESHLINK_EINVAL;
3941 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3945 mesh->channel_listen_cb = cb;
3947 pthread_mutex_unlock(&mesh->mutex);
3950 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3952 meshlink_errno = MESHLINK_EINVAL;
3956 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3960 mesh->channel_accept_cb = cb;
3961 mesh->receive_cb = channel_receive;
3963 for splay_each(node_t, n, mesh->nodes) {
3964 if(!n->utcp && n != mesh->self) {
3965 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3966 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3967 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3971 pthread_mutex_unlock(&mesh->mutex);
3974 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3978 meshlink_errno = MESHLINK_EINVAL;
3982 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3986 utcp_set_sndbuf(channel->c, size);
3987 pthread_mutex_unlock(&mesh->mutex);
3990 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3994 meshlink_errno = MESHLINK_EINVAL;
3998 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4002 utcp_set_rcvbuf(channel->c, size);
4003 pthread_mutex_unlock(&mesh->mutex);
4006 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) {
4008 abort(); // TODO: handle non-NULL data
4011 if(!mesh || !node) {
4012 meshlink_errno = MESHLINK_EINVAL;
4016 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4020 node_t *n = (node_t *)node;
4023 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4024 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4025 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4026 mesh->receive_cb = channel_receive;
4029 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4030 pthread_mutex_unlock(&mesh->mutex);
4035 if(n->status.blacklisted) {
4036 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
4037 meshlink_errno = MESHLINK_EBLACKLISTED;
4038 pthread_mutex_unlock(&mesh->mutex);
4042 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
4044 channel->receive_cb = cb;
4047 channel->priv = (void *)data;
4050 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
4052 pthread_mutex_unlock(&mesh->mutex);
4055 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
4063 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) {
4064 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4067 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4068 if(!mesh || !channel) {
4069 meshlink_errno = MESHLINK_EINVAL;
4073 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4077 utcp_shutdown(channel->c, direction);
4078 pthread_mutex_unlock(&mesh->mutex);
4081 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4082 if(!mesh || !channel) {
4083 meshlink_errno = MESHLINK_EINVAL;
4087 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4092 utcp_close(channel->c);
4095 /* Clean up any outstanding AIO buffers. */
4096 aio_abort(mesh, channel, &channel->aio_send);
4097 aio_abort(mesh, channel, &channel->aio_receive);
4100 if(!channel->in_callback) {
4104 pthread_mutex_unlock(&mesh->mutex);
4107 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4108 if(!mesh || !channel) {
4109 meshlink_errno = MESHLINK_EINVAL;
4118 meshlink_errno = MESHLINK_EINVAL;
4122 // TODO: more finegrained locking.
4123 // Ideally we want to put the data into the UTCP connection's send buffer.
4124 // Then, preferably only if there is room in the receiver window,
4125 // kick the meshlink thread to go send packets.
4129 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4133 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4134 if(channel->aio_send) {
4137 retval = utcp_send(channel->c, data, len);
4140 pthread_mutex_unlock(&mesh->mutex);
4143 meshlink_errno = MESHLINK_ENETWORK;
4149 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) {
4150 if(!mesh || !channel) {
4151 meshlink_errno = MESHLINK_EINVAL;
4156 meshlink_errno = MESHLINK_EINVAL;
4160 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4163 aio->cb.buffer = cb;
4166 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4170 /* Append the AIO buffer descriptor to the end of the chain */
4171 meshlink_aio_buffer_t **p = &channel->aio_send;
4179 /* Ensure the poll callback is set, and call it right now to push data if possible */
4180 utcp_set_poll_cb(channel->c, channel_poll);
4181 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4184 channel_poll(channel->c, todo);
4187 pthread_mutex_unlock(&mesh->mutex);
4192 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) {
4193 if(!mesh || !channel) {
4194 meshlink_errno = MESHLINK_EINVAL;
4198 if(!len || fd == -1) {
4199 meshlink_errno = MESHLINK_EINVAL;
4203 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4209 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4213 /* Append the AIO buffer descriptor to the end of the chain */
4214 meshlink_aio_buffer_t **p = &channel->aio_send;
4222 /* Ensure the poll callback is set, and call it right now to push data if possible */
4223 utcp_set_poll_cb(channel->c, channel_poll);
4224 size_t left = utcp_get_rcvbuf_free(channel->c);
4227 channel_poll(channel->c, left);
4230 pthread_mutex_unlock(&mesh->mutex);
4235 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) {
4236 if(!mesh || !channel) {
4237 meshlink_errno = MESHLINK_EINVAL;
4242 meshlink_errno = MESHLINK_EINVAL;
4246 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4249 aio->cb.buffer = cb;
4252 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4256 /* Append the AIO buffer descriptor to the end of the chain */
4257 meshlink_aio_buffer_t **p = &channel->aio_receive;
4265 pthread_mutex_unlock(&mesh->mutex);
4270 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) {
4271 if(!mesh || !channel) {
4272 meshlink_errno = MESHLINK_EINVAL;
4276 if(!len || fd == -1) {
4277 meshlink_errno = MESHLINK_EINVAL;
4281 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4287 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4291 /* Append the AIO buffer descriptor to the end of the chain */
4292 meshlink_aio_buffer_t **p = &channel->aio_receive;
4300 pthread_mutex_unlock(&mesh->mutex);
4305 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4306 if(!mesh || !channel) {
4307 meshlink_errno = MESHLINK_EINVAL;
4311 return channel->c->flags;
4314 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4315 if(!mesh || !channel) {
4316 meshlink_errno = MESHLINK_EINVAL;
4320 return utcp_get_sendq(channel->c);
4323 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4324 if(!mesh || !channel) {
4325 meshlink_errno = MESHLINK_EINVAL;
4329 return utcp_get_recvq(channel->c);
4332 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4333 if(!mesh || !channel) {
4334 meshlink_errno = MESHLINK_EINVAL;
4338 return utcp_get_mss(channel->node->utcp);
4341 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4342 if(!mesh || !node) {
4343 meshlink_errno = MESHLINK_EINVAL;
4347 node_t *n = (node_t *)node;
4349 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4354 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4355 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4356 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4359 utcp_set_user_timeout(n->utcp, timeout);
4361 pthread_mutex_unlock(&mesh->mutex);
4364 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4365 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4366 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4367 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4368 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4371 if(mesh->node_status_cb) {
4372 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4375 if(mesh->node_pmtu_cb) {
4376 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4380 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4381 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4383 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4384 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4388 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4389 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4393 n->status.duplicate = true;
4394 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4397 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4401 meshlink_errno = MESHLINK_EINVAL;
4405 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4409 if(mesh->discovery == enable) {
4413 if(mesh->threadstarted) {
4415 discovery_start(mesh);
4417 discovery_stop(mesh);
4421 mesh->discovery = enable;
4424 pthread_mutex_unlock(&mesh->mutex);
4428 meshlink_errno = MESHLINK_ENOTSUP;
4432 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4433 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4434 meshlink_errno = EINVAL;
4438 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4439 meshlink_errno = EINVAL;
4443 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4447 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4448 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4449 pthread_mutex_unlock(&mesh->mutex);
4452 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4453 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4454 meshlink_errno = EINVAL;
4458 if(fast_retry_period < 0) {
4459 meshlink_errno = EINVAL;
4463 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4467 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4468 pthread_mutex_unlock(&mesh->mutex);
4471 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4472 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4473 meshlink_errno = EINVAL;
4477 if(maxtimeout < 0) {
4478 meshlink_errno = EINVAL;
4482 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4486 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4487 pthread_mutex_unlock(&mesh->mutex);
4490 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4495 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4499 handle_network_change(mesh, true);
4500 pthread_mutex_unlock(&mesh->mutex);
4503 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4505 meshlink_errno = EINVAL;
4509 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4513 mesh->inviter_commits_first = inviter_commits_first;
4514 pthread_mutex_unlock(&mesh->mutex);
4517 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4519 meshlink_errno = EINVAL;
4523 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4524 meshlink_errno = EINVAL;
4528 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4532 free(mesh->external_address_url);
4533 mesh->external_address_url = url ? xstrdup(url) : NULL;
4534 pthread_mutex_unlock(&mesh->mutex);
4537 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4538 if(!mesh || granularity < 0) {
4539 meshlink_errno = EINVAL;
4543 utcp_set_clock_granularity(granularity);
4546 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4549 if(!mesh->connections || !mesh->loop.running) {
4554 signal_trigger(&mesh->loop, &mesh->datafromapp);
4557 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4558 // We should only call the callback function if we are in the background thread.
4559 if(!mesh->error_cb) {
4563 if(!mesh->threadstarted) {
4567 if(mesh->thread == pthread_self()) {
4568 mesh->error_cb(mesh, cb_errno);
4572 static void __attribute__((constructor)) meshlink_init(void) {
4574 utcp_set_clock_granularity(10000);
4577 static void __attribute__((destructor)) meshlink_exit(void) {