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 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
350 // Determine address of the local interface used for outgoing connections.
351 char localaddr[NI_MAXHOST];
352 bool success = false;
354 if(family == AF_INET) {
355 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
356 } else if(family == AF_INET6) {
357 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
360 #ifdef HAVE_GETIFADDRS
363 struct ifaddrs *ifa = NULL;
366 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
367 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
369 if(sa->sa.sa_family != family) {
373 if(is_localaddr(sa)) {
377 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
389 meshlink_errno = MESHLINK_ENETWORK;
393 return xstrdup(localaddr);
396 static void remove_duplicate_hostnames(char *host[], char *port[], int n) {
397 for(int i = 0; i < n; i++) {
402 // Ignore duplicate hostnames
405 for(int j = 0; j < i; j++) {
410 if(strcmp(host[i], host[j])) {
414 if(strcmp(port[i], port[j])) {
422 if(found || !is_valid_hostname(host[i])) {
432 // This gets the hostname part for use in invitation URLs
433 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
434 int count = 4 + (mesh->invitation_addresses ? mesh->invitation_addresses->count : 0);
436 char *hostname[count];
438 char *hostport = NULL;
440 memset(hostname, 0, sizeof(hostname));
441 memset(port, 0, sizeof(port));
443 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
444 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
447 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
448 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
451 // Add all explicitly set invitation addresses
452 if(mesh->invitation_addresses) {
453 for list_each(char, combo, mesh->invitation_addresses) {
454 hostname[n] = xstrdup(combo);
455 char *slash = strrchr(hostname[n], '/');
459 port[n] = xstrdup(slash + 1);
466 // Add local addresses if requested
467 if(flags & MESHLINK_INVITE_LOCAL) {
468 if(flags & MESHLINK_INVITE_IPV4) {
469 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET);
472 if(flags & MESHLINK_INVITE_IPV6) {
473 hostname[n++] = meshlink_get_local_address_for_family(mesh, AF_INET6);
477 // Add public/canonical addresses if requested
478 if(flags & MESHLINK_INVITE_PUBLIC) {
479 // Try the CanonicalAddress first
480 get_canonical_address(mesh->self, &hostname[n], &port[n]);
482 if(!hostname[n] && count == 4) {
483 if(flags & MESHLINK_INVITE_IPV4) {
484 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET);
487 if(flags & MESHLINK_INVITE_IPV6) {
488 hostname[n++] = meshlink_get_external_address_for_family(mesh, AF_INET6);
495 for(int i = 0; i < n; i++) {
496 // Ensure we always have a port number
497 if(hostname[i] && !port[i]) {
498 port[i] = xstrdup(mesh->myport);
502 remove_duplicate_hostnames(hostname, port, n);
504 // Resolve the hostnames
505 for(int i = 0; i < n; i++) {
510 // Convert what we have to a sockaddr
511 struct addrinfo *ai_in = adns_blocking_request(mesh, xstrdup(hostname[i]), xstrdup(port[i]), SOCK_STREAM, 5);
517 // Remember the address(es)
518 for(struct addrinfo *aip = ai_in; aip; aip = aip->ai_next) {
519 node_add_recent_address(mesh, mesh->self, (sockaddr_t *)aip->ai_addr);
526 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
527 remove_duplicate_hostnames(hostname, port, n);
529 // Concatenate all unique address to the hostport string
530 for(int i = 0; i < n; i++) {
535 // Append the address to the hostport string
537 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
539 hostport = newhostport;
548 static bool try_bind(meshlink_handle_t *mesh, int port) {
549 struct addrinfo *ai = NULL;
550 struct addrinfo hint = {
551 .ai_flags = AI_PASSIVE,
552 .ai_family = AF_UNSPEC,
553 .ai_socktype = SOCK_STREAM,
554 .ai_protocol = IPPROTO_TCP,
558 snprintf(portstr, sizeof(portstr), "%d", port);
560 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
564 bool success = false;
566 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
567 /* Try to bind to TCP. */
569 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
572 if(errno == EADDRINUSE) {
573 /* If this port is in use for any address family, avoid it. */
581 /* If TCP worked, then we require that UDP works as well. */
583 int udp_fd = setup_udp_listen_socket(mesh, aip);
600 int check_port(meshlink_handle_t *mesh) {
601 for(int i = 0; i < 1000; i++) {
602 int port = 0x1000 + prng(mesh, 0x8000);
604 if(try_bind(mesh, port)) {
606 xasprintf(&mesh->myport, "%d", port);
611 meshlink_errno = MESHLINK_ENETWORK;
612 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
616 static bool write_main_config_files(meshlink_handle_t *mesh) {
617 if(!mesh->confbase) {
623 /* Write the main config file */
624 packmsg_output_t out = {buf, sizeof buf};
626 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
627 packmsg_add_str(&out, mesh->name);
628 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
629 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
630 packmsg_add_uint16(&out, atoi(mesh->myport));
632 if(!packmsg_output_ok(&out)) {
636 config_t config = {buf, packmsg_output_size(&out, buf)};
638 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
642 /* Write our own host config file */
643 if(!node_write_config(mesh, mesh->self)) {
651 meshlink_handle_t *mesh;
653 char cookie[18 + 32];
664 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
665 meshlink_handle_t *mesh = state->mesh;
666 packmsg_input_t in = {buf, len};
667 uint32_t version = packmsg_get_uint32(&in);
669 if(version != MESHLINK_INVITATION_VERSION) {
670 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
674 char *name = packmsg_get_str_dup(&in);
675 char *submesh_name = packmsg_get_str_dup(&in);
676 dev_class_t devclass = packmsg_get_int32(&in);
677 uint32_t count = packmsg_get_array(&in);
679 if(!name || !check_id(name)) {
680 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
686 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
687 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
694 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
701 free(mesh->self->name);
703 mesh->self->name = xstrdup(name);
704 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
706 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
708 // Initialize configuration directory
709 if(!config_init(mesh, "current")) {
713 if(!write_main_config_files(mesh)) {
717 // Write host config files
718 for(uint32_t i = 0; i < count; i++) {
720 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
723 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
727 packmsg_input_t in2 = {data, data_len};
728 uint32_t version2 = packmsg_get_uint32(&in2);
729 char *name2 = packmsg_get_str_dup(&in2);
731 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
733 packmsg_input_invalidate(&in);
737 if(!check_id(name2)) {
742 if(!strcmp(name2, mesh->name)) {
743 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
745 meshlink_errno = MESHLINK_EPEER;
749 node_t *n = new_node();
752 config_t config = {data, data_len};
754 if(!node_read_from_config(mesh, n, &config)) {
756 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
757 meshlink_errno = MESHLINK_EPEER;
762 /* The first host config file is of the inviter itself;
763 * remember the address we are currently using for the invitation connection.
766 socklen_t salen = sizeof(sa);
768 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
769 node_add_recent_address(mesh, n, &sa);
773 /* Clear the reachability times, since we ourself have never seen these nodes yet */
774 n->last_reachable = 0;
775 n->last_unreachable = 0;
777 if(!node_write_config(mesh, n)) {
785 /* Ensure the configuration directory metadata is on disk */
786 if(!config_sync(mesh, "current") || !sync_path(mesh->confbase)) {
790 if(!mesh->inviter_commits_first) {
791 devtool_set_inviter_commits_first(false);
794 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
796 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
801 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
803 join_state_t *state = handle;
804 const char *ptr = data;
807 int result = send(state->sock, ptr, len, 0);
809 if(result == -1 && errno == EINTR) {
811 } else if(result <= 0) {
822 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
823 join_state_t *state = handle;
824 meshlink_handle_t *mesh = state->mesh;
826 if(mesh->inviter_commits_first) {
828 case SPTPS_HANDSHAKE:
829 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
835 if(!finalize_join(state, msg, len)) {
839 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
840 shutdown(state->sock, SHUT_RDWR);
841 state->success = true;
849 case SPTPS_HANDSHAKE:
850 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
853 return finalize_join(state, msg, len);
856 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
857 shutdown(state->sock, SHUT_RDWR);
858 state->success = true;
869 static bool recvline(join_state_t *state) {
870 char *newline = NULL;
872 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
873 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
875 if(result == -1 && errno == EINTR) {
877 } else if(result <= 0) {
881 state->blen += result;
884 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
888 size_t len = newline - state->buffer;
890 memcpy(state->line, state->buffer, len);
891 state->line[len] = 0;
892 memmove(state->buffer, newline + 1, state->blen - len - 1);
893 state->blen -= len + 1;
898 static bool sendline(int fd, const char *format, ...) {
904 va_start(ap, format);
905 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
908 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
916 int result = send(fd, p, blen, MSG_NOSIGNAL);
918 if(result == -1 && errno == EINTR) {
920 } else if(result <= 0) {
931 static const char *errstr[] = {
932 [MESHLINK_OK] = "No error",
933 [MESHLINK_EINVAL] = "Invalid argument",
934 [MESHLINK_ENOMEM] = "Out of memory",
935 [MESHLINK_ENOENT] = "No such node",
936 [MESHLINK_EEXIST] = "Node already exists",
937 [MESHLINK_EINTERNAL] = "Internal error",
938 [MESHLINK_ERESOLV] = "Could not resolve hostname",
939 [MESHLINK_ESTORAGE] = "Storage error",
940 [MESHLINK_ENETWORK] = "Network error",
941 [MESHLINK_EPEER] = "Error communicating with peer",
942 [MESHLINK_ENOTSUP] = "Operation not supported",
943 [MESHLINK_EBUSY] = "MeshLink instance already in use",
944 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
947 const char *meshlink_strerror(meshlink_errno_t err) {
948 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
949 return "Invalid error code";
955 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
956 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
958 mesh->private_key = ecdsa_generate();
959 mesh->invitation_key = ecdsa_generate();
961 if(!mesh->private_key || !mesh->invitation_key) {
962 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
963 meshlink_errno = MESHLINK_EINTERNAL;
967 logger(mesh, MESHLINK_DEBUG, "Done.\n");
972 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
973 if(a->tv_sec == b->tv_sec) {
974 return a->tv_nsec < b->tv_nsec;
976 return a->tv_sec < b->tv_sec;
980 static struct timespec idle(event_loop_t *loop, void *data) {
982 meshlink_handle_t *mesh = data;
983 struct timespec t, tmin = {3600, 0};
985 for splay_each(node_t, n, mesh->nodes) {
990 t = utcp_timeout(n->utcp);
992 if(timespec_lt(&t, &tmin)) {
1000 // Get our local address(es) by simulating connecting to an Internet host.
1001 static void add_local_addresses(meshlink_handle_t *mesh) {
1003 sa.storage.ss_family = AF_UNKNOWN;
1004 socklen_t salen = sizeof(sa);
1008 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
1009 sa.in.sin_port = ntohs(atoi(mesh->myport));
1010 node_add_recent_address(mesh, mesh->self, &sa);
1017 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
1018 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
1019 node_add_recent_address(mesh, mesh->self, &sa);
1023 static bool meshlink_setup(meshlink_handle_t *mesh) {
1024 if(!config_destroy(mesh->confbase, "new")) {
1025 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
1026 meshlink_errno = MESHLINK_ESTORAGE;
1030 if(!config_destroy(mesh->confbase, "old")) {
1031 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1032 meshlink_errno = MESHLINK_ESTORAGE;
1036 if(!config_init(mesh, "current")) {
1037 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
1038 meshlink_errno = MESHLINK_ESTORAGE;
1042 if(!ecdsa_keygen(mesh)) {
1043 meshlink_errno = MESHLINK_EINTERNAL;
1047 if(check_port(mesh) == 0) {
1048 meshlink_errno = MESHLINK_ENETWORK;
1052 /* Create a node for ourself */
1054 mesh->self = new_node();
1055 mesh->self->name = xstrdup(mesh->name);
1056 mesh->self->devclass = mesh->devclass;
1057 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
1058 mesh->self->session_id = mesh->session_id;
1060 if(!write_main_config_files(mesh)) {
1061 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
1062 meshlink_errno = MESHLINK_ESTORAGE;
1066 /* Ensure the configuration directory metadata is on disk */
1067 if(!config_sync(mesh, "current")) {
1074 static bool meshlink_read_config(meshlink_handle_t *mesh) {
1077 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
1078 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
1082 packmsg_input_t in = {config.buf, config.len};
1083 const void *private_key;
1084 const void *invitation_key;
1086 uint32_t version = packmsg_get_uint32(&in);
1087 char *name = packmsg_get_str_dup(&in);
1088 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
1089 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
1090 uint16_t myport = packmsg_get_uint16(&in);
1092 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
1093 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
1095 config_free(&config);
1099 if(mesh->name && strcmp(mesh->name, name)) {
1100 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
1101 meshlink_errno = MESHLINK_ESTORAGE;
1103 config_free(&config);
1109 xasprintf(&mesh->myport, "%u", myport);
1110 mesh->private_key = ecdsa_set_private_key(private_key);
1111 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
1112 config_free(&config);
1114 /* Create a node for ourself and read our host configuration file */
1116 mesh->self = new_node();
1117 mesh->self->name = xstrdup(name);
1118 mesh->self->devclass = mesh->devclass;
1119 mesh->self->session_id = mesh->session_id;
1121 if(!node_read_public_key(mesh, mesh->self)) {
1122 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1123 meshlink_errno = MESHLINK_ESTORAGE;
1124 free_node(mesh->self);
1133 static void *setup_network_in_netns_thread(void *arg) {
1134 meshlink_handle_t *mesh = arg;
1136 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1140 bool success = setup_network(mesh);
1141 return success ? arg : NULL;
1143 #endif // HAVE_SETNS
1145 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1146 if(!confbase || !*confbase) {
1147 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1148 meshlink_errno = MESHLINK_EINVAL;
1152 if(!appname || !*appname) {
1153 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1154 meshlink_errno = MESHLINK_EINVAL;
1158 if(strchr(appname, ' ')) {
1159 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1160 meshlink_errno = MESHLINK_EINVAL;
1164 if(name && !check_id(name)) {
1165 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1166 meshlink_errno = MESHLINK_EINVAL;
1170 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1171 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1172 meshlink_errno = MESHLINK_EINVAL;
1176 meshlink_open_params_t *params = xzalloc(sizeof * params);
1178 params->confbase = xstrdup(confbase);
1179 params->name = name ? xstrdup(name) : NULL;
1180 params->appname = xstrdup(appname);
1181 params->devclass = devclass;
1187 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1189 meshlink_errno = MESHLINK_EINVAL;
1193 params->netns = netns;
1198 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1200 meshlink_errno = MESHLINK_EINVAL;
1204 if((!key && keylen) || (key && !keylen)) {
1205 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1206 meshlink_errno = MESHLINK_EINVAL;
1211 params->keylen = keylen;
1216 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1217 if(!mesh || !new_key || !new_keylen) {
1218 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1219 meshlink_errno = MESHLINK_EINVAL;
1223 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1227 // Create hash for the new key
1228 void *new_config_key;
1229 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1231 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1232 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1233 meshlink_errno = MESHLINK_EINTERNAL;
1234 pthread_mutex_unlock(&mesh->mutex);
1238 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1240 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1241 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1242 meshlink_errno = MESHLINK_ESTORAGE;
1243 pthread_mutex_unlock(&mesh->mutex);
1247 devtool_keyrotate_probe(1);
1249 // Rename confbase/current/ to confbase/old
1251 if(!config_rename(mesh, "current", "old")) {
1252 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1253 meshlink_errno = MESHLINK_ESTORAGE;
1254 pthread_mutex_unlock(&mesh->mutex);
1258 devtool_keyrotate_probe(2);
1260 // Rename confbase/new/ to confbase/current
1262 if(!config_rename(mesh, "new", "current")) {
1263 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1264 meshlink_errno = MESHLINK_ESTORAGE;
1265 pthread_mutex_unlock(&mesh->mutex);
1269 devtool_keyrotate_probe(3);
1271 // Cleanup the "old" confbase sub-directory
1273 if(!config_destroy(mesh->confbase, "old")) {
1274 pthread_mutex_unlock(&mesh->mutex);
1278 // Change the mesh handle key with new key
1280 free(mesh->config_key);
1281 mesh->config_key = new_config_key;
1283 pthread_mutex_unlock(&mesh->mutex);
1288 void meshlink_open_params_free(meshlink_open_params_t *params) {
1290 meshlink_errno = MESHLINK_EINVAL;
1294 free(params->confbase);
1296 free(params->appname);
1301 /// Device class traits
1302 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1303 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1304 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1305 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1306 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1309 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1310 if(!confbase || !*confbase) {
1311 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1312 meshlink_errno = MESHLINK_EINVAL;
1316 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1317 meshlink_open_params_t params;
1318 memset(¶ms, 0, sizeof(params));
1320 params.confbase = (char *)confbase;
1321 params.name = (char *)name;
1322 params.appname = (char *)appname;
1323 params.devclass = devclass;
1326 return meshlink_open_ex(¶ms);
1329 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) {
1330 if(!confbase || !*confbase) {
1331 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1332 meshlink_errno = MESHLINK_EINVAL;
1336 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1337 meshlink_open_params_t params;
1338 memset(¶ms, 0, sizeof(params));
1340 params.confbase = (char *)confbase;
1341 params.name = (char *)name;
1342 params.appname = (char *)appname;
1343 params.devclass = devclass;
1346 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1350 return meshlink_open_ex(¶ms);
1353 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1355 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1356 meshlink_errno = MESHLINK_EINVAL;
1360 if(!check_id(name)) {
1361 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1362 meshlink_errno = MESHLINK_EINVAL;
1366 if(!appname || !*appname) {
1367 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1368 meshlink_errno = MESHLINK_EINVAL;
1372 if(strchr(appname, ' ')) {
1373 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1374 meshlink_errno = MESHLINK_EINVAL;
1378 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1379 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1380 meshlink_errno = MESHLINK_EINVAL;
1384 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1385 meshlink_open_params_t params;
1386 memset(¶ms, 0, sizeof(params));
1388 params.name = (char *)name;
1389 params.appname = (char *)appname;
1390 params.devclass = devclass;
1393 return meshlink_open_ex(¶ms);
1396 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1397 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1399 // Validate arguments provided by the application
1400 if(!params->appname || !*params->appname) {
1401 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1402 meshlink_errno = MESHLINK_EINVAL;
1406 if(strchr(params->appname, ' ')) {
1407 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1408 meshlink_errno = MESHLINK_EINVAL;
1412 if(params->name && !check_id(params->name)) {
1413 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1414 meshlink_errno = MESHLINK_EINVAL;
1418 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1419 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1420 meshlink_errno = MESHLINK_EINVAL;
1424 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1425 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1426 meshlink_errno = MESHLINK_EINVAL;
1430 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1432 if(params->confbase) {
1433 mesh->confbase = xstrdup(params->confbase);
1436 mesh->appname = xstrdup(params->appname);
1437 mesh->devclass = params->devclass;
1438 mesh->discovery = true;
1439 mesh->invitation_timeout = 604800; // 1 week
1440 mesh->netns = params->netns;
1441 mesh->submeshes = NULL;
1442 mesh->log_cb = global_log_cb;
1443 mesh->log_level = global_log_level;
1444 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1446 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1449 randomize(&mesh->session_id, sizeof(mesh->session_id));
1450 } while(mesh->session_id == 0);
1452 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1454 mesh->name = params->name ? xstrdup(params->name) : NULL;
1458 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1460 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1461 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1462 meshlink_close(mesh);
1463 meshlink_errno = MESHLINK_EINTERNAL;
1468 // initialize mutexes and conds
1469 pthread_mutexattr_t attr;
1470 pthread_mutexattr_init(&attr);
1472 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1476 pthread_mutex_init(&mesh->mutex, &attr);
1477 pthread_cond_init(&mesh->cond, NULL);
1479 pthread_mutex_init(&mesh->discovery_mutex, NULL);
1480 pthread_cond_init(&mesh->discovery_cond, NULL);
1482 pthread_cond_init(&mesh->adns_cond, NULL);
1484 mesh->threadstarted = false;
1485 event_loop_init(&mesh->loop);
1486 mesh->loop.data = mesh;
1488 meshlink_queue_init(&mesh->outpacketqueue);
1490 // Atomically lock the configuration directory.
1491 if(!main_config_lock(mesh)) {
1492 meshlink_close(mesh);
1496 // If no configuration exists yet, create it.
1498 if(!meshlink_confbase_exists(mesh)) {
1500 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1501 meshlink_close(mesh);
1502 meshlink_errno = MESHLINK_ESTORAGE;
1506 if(!meshlink_setup(mesh)) {
1507 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1508 meshlink_close(mesh);
1512 if(!meshlink_read_config(mesh)) {
1513 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1514 meshlink_close(mesh);
1520 struct WSAData wsa_state;
1521 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1524 // Setup up everything
1525 // TODO: we should not open listening sockets yet
1527 bool success = false;
1529 if(mesh->netns != -1) {
1533 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1534 void *retval = NULL;
1535 success = pthread_join(thr, &retval) == 0 && retval;
1539 meshlink_errno = MESHLINK_EINTERNAL;
1542 #endif // HAVE_SETNS
1544 success = setup_network(mesh);
1548 meshlink_close(mesh);
1549 meshlink_errno = MESHLINK_ENETWORK;
1553 add_local_addresses(mesh);
1555 if(!node_write_config(mesh, mesh->self)) {
1556 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1560 idle_set(&mesh->loop, idle, mesh);
1562 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1566 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1567 meshlink_submesh_t *s = NULL;
1570 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1571 meshlink_errno = MESHLINK_EINVAL;
1575 if(!submesh || !*submesh) {
1576 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1577 meshlink_errno = MESHLINK_EINVAL;
1582 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1586 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1588 pthread_mutex_unlock(&mesh->mutex);
1593 static void *meshlink_main_loop(void *arg) {
1594 meshlink_handle_t *mesh = arg;
1596 if(mesh->netns != -1) {
1599 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1600 pthread_cond_signal(&mesh->cond);
1605 pthread_cond_signal(&mesh->cond);
1607 #endif // HAVE_SETNS
1612 if(mesh->discovery) {
1613 discovery_start(mesh);
1618 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1622 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1623 pthread_cond_broadcast(&mesh->cond);
1625 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1627 pthread_mutex_unlock(&mesh->mutex);
1632 if(mesh->discovery) {
1633 discovery_stop(mesh);
1641 bool meshlink_start(meshlink_handle_t *mesh) {
1643 meshlink_errno = MESHLINK_EINVAL;
1647 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1649 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1654 assert(mesh->private_key);
1655 assert(mesh->self->ecdsa);
1656 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1658 if(mesh->threadstarted) {
1659 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1660 pthread_mutex_unlock(&mesh->mutex);
1664 if(mesh->listen_socket[0].tcp.fd < 0) {
1665 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1666 meshlink_errno = MESHLINK_ENETWORK;
1670 // TODO: open listening sockets first
1672 //Check that a valid name is set
1674 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1675 meshlink_errno = MESHLINK_EINVAL;
1676 pthread_mutex_unlock(&mesh->mutex);
1680 init_outgoings(mesh);
1683 // Start the main thread
1685 event_loop_start(&mesh->loop);
1687 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1688 pthread_attr_t attr;
1689 pthread_attr_init(&attr);
1690 pthread_attr_setstacksize(&attr, 1024 * 1024);
1692 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1693 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1694 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1695 meshlink_errno = MESHLINK_EINTERNAL;
1696 event_loop_stop(&mesh->loop);
1697 pthread_mutex_unlock(&mesh->mutex);
1701 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1702 mesh->threadstarted = true;
1704 // Ensure we are considered reachable
1707 pthread_mutex_unlock(&mesh->mutex);
1711 void meshlink_stop(meshlink_handle_t *mesh) {
1713 meshlink_errno = MESHLINK_EINVAL;
1717 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1721 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1723 // Shut down the main thread
1724 event_loop_stop(&mesh->loop);
1726 // Send ourselves a UDP packet to kick the event loop
1727 for(int i = 0; i < mesh->listen_sockets; i++) {
1729 socklen_t salen = sizeof(sa);
1731 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1732 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1736 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1737 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1741 if(mesh->threadstarted) {
1742 // Wait for the main thread to finish
1743 pthread_mutex_unlock(&mesh->mutex);
1745 if(pthread_join(mesh->thread, NULL) != 0) {
1749 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1753 mesh->threadstarted = false;
1756 // Close all metaconnections
1757 if(mesh->connections) {
1758 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1760 connection_t *c = node->data;
1762 terminate_connection(mesh, c, false);
1767 exit_outgoings(mesh);
1769 // Ensure we are considered unreachable
1774 // Try to write out any changed node config files, ignore errors at this point.
1776 for splay_each(node_t, n, mesh->nodes) {
1777 if(n->status.dirty) {
1778 n->status.dirty = !node_write_config(mesh, n);
1783 pthread_mutex_unlock(&mesh->mutex);
1786 void meshlink_close(meshlink_handle_t *mesh) {
1788 meshlink_errno = MESHLINK_EINVAL;
1792 // stop can be called even if mesh has not been started
1793 meshlink_stop(mesh);
1795 // lock is not released after this
1796 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1800 // Close and free all resources used.
1802 close_network_connections(mesh);
1804 logger(mesh, MESHLINK_INFO, "Terminating");
1806 event_loop_exit(&mesh->loop);
1810 if(mesh->confbase) {
1816 ecdsa_free(mesh->invitation_key);
1818 if(mesh->netns != -1) {
1822 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1826 meshlink_queue_exit(&mesh->outpacketqueue);
1829 free(mesh->appname);
1830 free(mesh->confbase);
1831 free(mesh->config_key);
1832 free(mesh->external_address_url);
1834 ecdsa_free(mesh->private_key);
1836 if(mesh->invitation_addresses) {
1837 list_delete_list(mesh->invitation_addresses);
1840 main_config_unlock(mesh);
1842 pthread_mutex_unlock(&mesh->mutex);
1843 pthread_mutex_destroy(&mesh->mutex);
1845 memset(mesh, 0, sizeof(*mesh));
1850 bool meshlink_destroy(const char *confbase) {
1852 meshlink_errno = MESHLINK_EINVAL;
1856 /* Exit early if the confbase directory itself doesn't exist */
1857 if(access(confbase, F_OK) && errno == ENOENT) {
1861 /* Take the lock the same way meshlink_open() would. */
1862 char lockfilename[PATH_MAX];
1863 snprintf(lockfilename, sizeof(lockfilename), "%s" SLASH "meshlink.lock", confbase);
1865 FILE *lockfile = fopen(lockfilename, "w+");
1868 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", lockfilename, strerror(errno));
1869 meshlink_errno = MESHLINK_ESTORAGE;
1874 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1878 // TODO: use _locking()?
1881 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1882 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", lockfilename);
1884 meshlink_errno = MESHLINK_EBUSY;
1890 if(!config_destroy(confbase, "current") || !config_destroy(confbase, "new") || !config_destroy(confbase, "old")) {
1891 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", confbase, strerror(errno));
1895 if(unlink(lockfilename)) {
1896 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", lockfilename, strerror(errno));
1898 meshlink_errno = MESHLINK_ESTORAGE;
1904 if(!sync_path(confbase)) {
1905 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", confbase, strerror(errno));
1906 meshlink_errno = MESHLINK_ESTORAGE;
1913 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1915 meshlink_errno = MESHLINK_EINVAL;
1919 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1923 mesh->receive_cb = cb;
1924 pthread_mutex_unlock(&mesh->mutex);
1927 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1929 meshlink_errno = MESHLINK_EINVAL;
1933 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1937 mesh->connection_try_cb = cb;
1938 pthread_mutex_unlock(&mesh->mutex);
1941 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1943 meshlink_errno = MESHLINK_EINVAL;
1947 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1951 mesh->node_status_cb = cb;
1952 pthread_mutex_unlock(&mesh->mutex);
1955 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1957 meshlink_errno = MESHLINK_EINVAL;
1961 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1965 mesh->node_pmtu_cb = cb;
1966 pthread_mutex_unlock(&mesh->mutex);
1969 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1971 meshlink_errno = MESHLINK_EINVAL;
1975 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1979 mesh->node_duplicate_cb = cb;
1980 pthread_mutex_unlock(&mesh->mutex);
1983 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1985 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1990 mesh->log_level = cb ? level : 0;
1991 pthread_mutex_unlock(&mesh->mutex);
1994 global_log_level = cb ? level : 0;
1998 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
2000 meshlink_errno = MESHLINK_EINVAL;
2004 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2008 mesh->error_cb = cb;
2009 pthread_mutex_unlock(&mesh->mutex);
2012 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
2013 meshlink_packethdr_t *hdr;
2015 if(len > MAXSIZE - sizeof(*hdr)) {
2016 meshlink_errno = MESHLINK_EINVAL;
2020 node_t *n = (node_t *)destination;
2022 if(n->status.blacklisted) {
2023 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
2024 meshlink_errno = MESHLINK_EBLACKLISTED;
2028 // Prepare the packet
2029 packet->probe = false;
2030 packet->tcp = false;
2031 packet->len = len + sizeof(*hdr);
2033 hdr = (meshlink_packethdr_t *)packet->data;
2034 memset(hdr, 0, sizeof(*hdr));
2035 // leave the last byte as 0 to make sure strings are always
2036 // null-terminated if they are longer than the buffer
2037 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
2038 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
2040 memcpy(packet->data + sizeof(*hdr), data, len);
2045 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2047 assert(destination);
2051 // Prepare the packet
2052 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
2056 // Send it immediately
2057 route(mesh, mesh->self, mesh->packet);
2062 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
2063 // Validate arguments
2064 if(!mesh || !destination) {
2065 meshlink_errno = MESHLINK_EINVAL;
2074 meshlink_errno = MESHLINK_EINVAL;
2078 // Prepare the packet
2079 vpn_packet_t *packet = malloc(sizeof(*packet));
2082 meshlink_errno = MESHLINK_ENOMEM;
2086 if(!prepare_packet(mesh, destination, data, len, packet)) {
2092 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2094 meshlink_errno = MESHLINK_ENOMEM;
2098 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2100 // Notify event loop
2101 signal_trigger(&mesh->loop, &mesh->datafromapp);
2106 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2108 meshlink_handle_t *mesh = data;
2110 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2112 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2113 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2114 mesh->self->in_packets++;
2115 mesh->self->in_bytes += packet->len;
2116 route(mesh, mesh->self, packet);
2121 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2122 if(!mesh || !destination) {
2123 meshlink_errno = MESHLINK_EINVAL;
2127 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2131 node_t *n = (node_t *)destination;
2133 if(!n->status.reachable) {
2134 pthread_mutex_unlock(&mesh->mutex);
2137 } else if(n->mtuprobes > 30 && n->minmtu) {
2138 pthread_mutex_unlock(&mesh->mutex);
2141 pthread_mutex_unlock(&mesh->mutex);
2146 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2147 if(!mesh || !node) {
2148 meshlink_errno = MESHLINK_EINVAL;
2152 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2156 node_t *n = (node_t *)node;
2158 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2159 meshlink_errno = MESHLINK_EINTERNAL;
2160 pthread_mutex_unlock(&mesh->mutex);
2164 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2167 meshlink_errno = MESHLINK_EINTERNAL;
2170 pthread_mutex_unlock(&mesh->mutex);
2174 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2176 meshlink_errno = MESHLINK_EINVAL;
2180 return (meshlink_node_t *)mesh->self;
2183 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2184 if(!mesh || !name) {
2185 meshlink_errno = MESHLINK_EINVAL;
2191 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2195 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2196 pthread_mutex_unlock(&mesh->mutex);
2199 meshlink_errno = MESHLINK_ENOENT;
2202 return (meshlink_node_t *)n;
2205 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2206 if(!mesh || !name) {
2207 meshlink_errno = MESHLINK_EINVAL;
2211 meshlink_submesh_t *submesh = NULL;
2213 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2217 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2218 pthread_mutex_unlock(&mesh->mutex);
2221 meshlink_errno = MESHLINK_ENOENT;
2227 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2228 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2229 meshlink_errno = MESHLINK_EINVAL;
2233 meshlink_node_t **result;
2236 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2240 *nmemb = mesh->nodes->count;
2241 result = realloc(nodes, *nmemb * sizeof(*nodes));
2244 meshlink_node_t **p = result;
2246 for splay_each(node_t, n, mesh->nodes) {
2247 *p++ = (meshlink_node_t *)n;
2252 meshlink_errno = MESHLINK_ENOMEM;
2255 pthread_mutex_unlock(&mesh->mutex);
2260 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) {
2261 meshlink_node_t **result;
2263 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2269 for splay_each(node_t, n, mesh->nodes) {
2270 if(search_node(n, condition)) {
2277 pthread_mutex_unlock(&mesh->mutex);
2281 result = realloc(nodes, *nmemb * sizeof(*nodes));
2284 meshlink_node_t **p = result;
2286 for splay_each(node_t, n, mesh->nodes) {
2287 if(search_node(n, condition)) {
2288 *p++ = (meshlink_node_t *)n;
2294 meshlink_errno = MESHLINK_ENOMEM;
2297 pthread_mutex_unlock(&mesh->mutex);
2302 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2303 dev_class_t *devclass = (dev_class_t *)condition;
2305 if(*devclass == (dev_class_t)node->devclass) {
2312 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2313 if(condition == node->submesh) {
2325 static bool search_node_by_last_reachable(const node_t *node, const void *condition) {
2326 const struct time_range *range = condition;
2327 time_t start = node->last_reachable;
2328 time_t end = node->last_unreachable;
2338 if(range->end >= range->start) {
2339 return start <= range->end && end >= range->start;
2341 return start > range->start || end < range->end;
2345 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) {
2346 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2347 meshlink_errno = MESHLINK_EINVAL;
2351 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2354 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2355 if(!mesh || !submesh || !nmemb) {
2356 meshlink_errno = MESHLINK_EINVAL;
2360 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2363 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) {
2364 if(!mesh || !nmemb) {
2365 meshlink_errno = MESHLINK_EINVAL;
2369 struct time_range range = {start, end};
2371 return meshlink_get_all_nodes_by_condition(mesh, &range, nodes, nmemb, search_node_by_last_reachable);
2374 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2375 if(!mesh || !node) {
2376 meshlink_errno = MESHLINK_EINVAL;
2380 dev_class_t devclass;
2382 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2386 devclass = ((node_t *)node)->devclass;
2388 pthread_mutex_unlock(&mesh->mutex);
2393 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2394 if(!mesh || !node) {
2395 meshlink_errno = MESHLINK_EINVAL;
2399 node_t *n = (node_t *)node;
2401 meshlink_submesh_t *s;
2403 s = (meshlink_submesh_t *)n->submesh;
2408 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2409 if(!mesh || !node) {
2410 meshlink_errno = MESHLINK_EINVAL;
2414 node_t *n = (node_t *)node;
2417 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2421 reachable = n->status.reachable && !n->status.blacklisted;
2423 if(last_reachable) {
2424 *last_reachable = n->last_reachable;
2427 if(last_unreachable) {
2428 *last_unreachable = n->last_unreachable;
2431 pthread_mutex_unlock(&mesh->mutex);
2436 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2437 if(!mesh || !data || !len || !signature || !siglen) {
2438 meshlink_errno = MESHLINK_EINVAL;
2442 if(*siglen < MESHLINK_SIGLEN) {
2443 meshlink_errno = MESHLINK_EINVAL;
2447 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2451 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2452 meshlink_errno = MESHLINK_EINTERNAL;
2453 pthread_mutex_unlock(&mesh->mutex);
2457 *siglen = MESHLINK_SIGLEN;
2458 pthread_mutex_unlock(&mesh->mutex);
2462 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2463 if(!mesh || !source || !data || !len || !signature) {
2464 meshlink_errno = MESHLINK_EINVAL;
2468 if(siglen != MESHLINK_SIGLEN) {
2469 meshlink_errno = MESHLINK_EINVAL;
2473 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2479 struct node_t *n = (struct node_t *)source;
2481 if(!node_read_public_key(mesh, n)) {
2482 meshlink_errno = MESHLINK_EINTERNAL;
2485 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2488 pthread_mutex_unlock(&mesh->mutex);
2492 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2493 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2497 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2500 // TODO: Update invitation key if necessary?
2503 pthread_mutex_unlock(&mesh->mutex);
2505 return mesh->invitation_key;
2508 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2509 if(!mesh || !node || !address) {
2510 meshlink_errno = MESHLINK_EINVAL;
2514 if(!is_valid_hostname(address)) {
2515 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s", address);
2516 meshlink_errno = MESHLINK_EINVAL;
2520 if((node_t *)node != mesh->self && !port) {
2521 logger(mesh, MESHLINK_DEBUG, "Missing port number!");
2522 meshlink_errno = MESHLINK_EINVAL;
2527 if(port && !is_valid_port(port)) {
2528 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s", address);
2529 meshlink_errno = MESHLINK_EINVAL;
2533 char *canonical_address;
2536 xasprintf(&canonical_address, "%s %s", address, port);
2538 canonical_address = xstrdup(address);
2541 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2545 node_t *n = (node_t *)node;
2546 free(n->canonical_address);
2547 n->canonical_address = canonical_address;
2549 if(!node_write_config(mesh, n)) {
2550 pthread_mutex_unlock(&mesh->mutex);
2554 pthread_mutex_unlock(&mesh->mutex);
2556 return config_sync(mesh, "current");
2559 bool meshlink_add_invitation_address(struct meshlink_handle *mesh, const char *address, const char *port) {
2560 if(!mesh || !address) {
2561 meshlink_errno = MESHLINK_EINVAL;
2565 if(!is_valid_hostname(address)) {
2566 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2567 meshlink_errno = MESHLINK_EINVAL;
2571 if(port && !is_valid_port(port)) {
2572 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2573 meshlink_errno = MESHLINK_EINVAL;
2580 xasprintf(&combo, "%s/%s", address, port);
2582 combo = xstrdup(address);
2585 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2589 if(!mesh->invitation_addresses) {
2590 mesh->invitation_addresses = list_alloc((list_action_t)free);
2593 list_insert_tail(mesh->invitation_addresses, combo);
2594 pthread_mutex_unlock(&mesh->mutex);
2599 void meshlink_clear_invitation_addresses(struct meshlink_handle *mesh) {
2601 meshlink_errno = MESHLINK_EINVAL;
2605 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2609 if(mesh->invitation_addresses) {
2610 list_delete_list(mesh->invitation_addresses);
2611 mesh->invitation_addresses = NULL;
2614 pthread_mutex_unlock(&mesh->mutex);
2617 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2618 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2621 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2623 meshlink_errno = MESHLINK_EINVAL;
2627 char *address = meshlink_get_external_address(mesh);
2633 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2639 int meshlink_get_port(meshlink_handle_t *mesh) {
2641 meshlink_errno = MESHLINK_EINVAL;
2646 meshlink_errno = MESHLINK_EINTERNAL;
2652 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2656 port = atoi(mesh->myport);
2657 pthread_mutex_unlock(&mesh->mutex);
2662 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2663 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2664 meshlink_errno = MESHLINK_EINVAL;
2668 if(mesh->myport && port == atoi(mesh->myport)) {
2672 if(!try_bind(mesh, port)) {
2673 meshlink_errno = MESHLINK_ENETWORK;
2677 devtool_trybind_probe();
2681 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2685 if(mesh->threadstarted) {
2686 meshlink_errno = MESHLINK_EINVAL;
2691 xasprintf(&mesh->myport, "%d", port);
2693 /* Close down the network. This also deletes mesh->self. */
2694 close_network_connections(mesh);
2696 /* Recreate mesh->self. */
2697 mesh->self = new_node();
2698 mesh->self->name = xstrdup(mesh->name);
2699 mesh->self->devclass = mesh->devclass;
2700 mesh->self->session_id = mesh->session_id;
2701 xasprintf(&mesh->myport, "%d", port);
2703 if(!node_read_public_key(mesh, mesh->self)) {
2704 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2705 meshlink_errno = MESHLINK_ESTORAGE;
2706 free_node(mesh->self);
2709 } else if(!setup_network(mesh)) {
2710 meshlink_errno = MESHLINK_ENETWORK;
2714 /* Rebuild our own list of recent addresses */
2715 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2716 add_local_addresses(mesh);
2718 /* Write meshlink.conf with the updated port number */
2719 write_main_config_files(mesh);
2721 rval = config_sync(mesh, "current");
2724 pthread_mutex_unlock(&mesh->mutex);
2726 return rval && meshlink_get_port(mesh) == port;
2729 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2730 mesh->invitation_timeout = timeout;
2733 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2734 meshlink_submesh_t *s = NULL;
2737 meshlink_errno = MESHLINK_EINVAL;
2742 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2745 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2746 meshlink_errno = MESHLINK_EINVAL;
2750 s = (meshlink_submesh_t *)mesh->self->submesh;
2753 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2757 // Check validity of the new node's name
2758 if(!check_id(name)) {
2759 logger(mesh, MESHLINK_ERROR, "Invalid name for node.\n");
2760 meshlink_errno = MESHLINK_EINVAL;
2761 pthread_mutex_unlock(&mesh->mutex);
2765 // Ensure no host configuration file with that name exists
2766 if(config_exists(mesh, "current", name)) {
2767 logger(mesh, MESHLINK_ERROR, "A host config file for %s already exists!\n", name);
2768 meshlink_errno = MESHLINK_EEXIST;
2769 pthread_mutex_unlock(&mesh->mutex);
2773 // Ensure no other nodes know about this name
2774 if(lookup_node(mesh, name)) {
2775 logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
2776 meshlink_errno = MESHLINK_EEXIST;
2777 pthread_mutex_unlock(&mesh->mutex);
2781 // Get the local address
2782 char *address = get_my_hostname(mesh, flags);
2785 logger(mesh, MESHLINK_ERROR, "No Address known for ourselves!\n");
2786 meshlink_errno = MESHLINK_ERESOLV;
2787 pthread_mutex_unlock(&mesh->mutex);
2791 if(!refresh_invitation_key(mesh)) {
2792 meshlink_errno = MESHLINK_EINTERNAL;
2793 pthread_mutex_unlock(&mesh->mutex);
2797 // If we changed our own host config file, write it out now
2798 if(mesh->self->status.dirty) {
2799 if(!node_write_config(mesh, mesh->self)) {
2800 logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
2801 pthread_mutex_unlock(&mesh->mutex);
2808 // Create a hash of the key.
2809 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2810 sha512(fingerprint, strlen(fingerprint), hash);
2811 b64encode_urlsafe(hash, hash, 18);
2813 // Create a random cookie for this invitation.
2815 randomize(cookie, 18);
2817 // Create a filename that doesn't reveal the cookie itself
2818 char buf[18 + strlen(fingerprint)];
2819 char cookiehash[64];
2820 memcpy(buf, cookie, 18);
2821 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2822 sha512(buf, sizeof(buf), cookiehash);
2823 b64encode_urlsafe(cookiehash, cookiehash, 18);
2825 b64encode_urlsafe(cookie, cookie, 18);
2829 /* Construct the invitation file */
2830 uint8_t outbuf[4096];
2831 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2833 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2834 packmsg_add_str(&inv, name);
2835 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2836 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2838 /* TODO: Add several host config files to bootstrap connections.
2839 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2840 * and are not blacklisted.
2842 config_t configs[5];
2843 memset(configs, 0, sizeof(configs));
2846 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2850 /* Append host config files to the invitation file */
2851 packmsg_add_array(&inv, count);
2853 for(int i = 0; i < count; i++) {
2854 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2855 config_free(&configs[i]);
2858 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2860 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2861 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2862 meshlink_errno = MESHLINK_ESTORAGE;
2863 pthread_mutex_unlock(&mesh->mutex);
2867 // Create an URL from the local address, key hash and cookie
2869 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2872 pthread_mutex_unlock(&mesh->mutex);
2876 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2877 return meshlink_invite_ex(mesh, submesh, name, 0);
2880 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2881 if(!mesh || !invitation) {
2882 meshlink_errno = MESHLINK_EINVAL;
2886 join_state_t state = {
2891 ecdsa_t *key = NULL;
2892 ecdsa_t *hiskey = NULL;
2894 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2895 char copy[strlen(invitation) + 1];
2897 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2901 //Before doing meshlink_join make sure we are not connected to another mesh
2902 if(mesh->threadstarted) {
2903 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2904 meshlink_errno = MESHLINK_EINVAL;
2908 // 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.
2909 if(mesh->nodes->count > 1) {
2910 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2911 meshlink_errno = MESHLINK_EINVAL;
2915 strcpy(copy, invitation);
2917 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2919 char *slash = strchr(copy, '/');
2927 if(strlen(slash) != 48) {
2931 char *address = copy;
2934 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2938 if(mesh->inviter_commits_first) {
2939 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2942 // Generate a throw-away key for the invitation.
2943 key = ecdsa_generate();
2946 meshlink_errno = MESHLINK_EINTERNAL;
2950 char *b64key = ecdsa_get_base64_public_key(key);
2953 while(address && *address) {
2954 // We allow commas in the address part to support multiple addresses in one invitation URL.
2955 comma = strchr(address, ',');
2961 // Split of the port
2962 port = strrchr(address, ':');
2970 // IPv6 address are enclosed in brackets, per RFC 3986
2971 if(*address == '[') {
2973 char *bracket = strchr(address, ']');
2986 // Connect to the meshlink daemon mentioned in the URL.
2987 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 5);
2990 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2991 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
2993 if(state.sock == -1) {
2994 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2995 meshlink_errno = MESHLINK_ENETWORK;
3001 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
3004 set_timeout(state.sock, 5000);
3006 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
3007 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
3008 meshlink_errno = MESHLINK_ENETWORK;
3009 closesocket(state.sock);
3019 meshlink_errno = MESHLINK_ERESOLV;
3022 if(state.sock != -1 || !comma) {
3029 if(state.sock == -1) {
3033 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
3035 // Tell him we have an invitation, and give him our throw-away key.
3039 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
3040 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
3041 meshlink_errno = MESHLINK_ENETWORK;
3047 char hisname[4096] = "";
3048 int code, hismajor, hisminor = 0;
3050 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) {
3051 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
3052 meshlink_errno = MESHLINK_ENETWORK;
3056 // Check if the hash of the key he gave us matches the hash in the URL.
3057 char *fingerprint = state.line + 2;
3060 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
3061 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
3062 meshlink_errno = MESHLINK_EINTERNAL;
3066 if(memcmp(hishash, state.hash, 18)) {
3067 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
3068 meshlink_errno = MESHLINK_EPEER;
3072 hiskey = ecdsa_set_base64_public_key(fingerprint);
3075 meshlink_errno = MESHLINK_EINTERNAL;
3079 // Start an SPTPS session
3080 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
3081 meshlink_errno = MESHLINK_EINTERNAL;
3085 // Feed rest of input buffer to SPTPS
3086 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
3087 meshlink_errno = MESHLINK_EPEER;
3092 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
3094 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
3096 if(errno == EINTR) {
3100 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
3101 meshlink_errno = MESHLINK_ENETWORK;
3105 if(!sptps_receive_data(&state.sptps, state.line, len)) {
3106 meshlink_errno = MESHLINK_EPEER;
3111 if(!state.success) {
3112 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
3113 meshlink_errno = MESHLINK_EPEER;
3117 sptps_stop(&state.sptps);
3120 closesocket(state.sock);
3122 pthread_mutex_unlock(&mesh->mutex);
3126 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
3127 meshlink_errno = MESHLINK_EINVAL;
3129 sptps_stop(&state.sptps);
3133 if(state.sock != -1) {
3134 closesocket(state.sock);
3137 pthread_mutex_unlock(&mesh->mutex);
3141 char *meshlink_export(meshlink_handle_t *mesh) {
3143 meshlink_errno = MESHLINK_EINVAL;
3147 // Create a config file on the fly.
3150 packmsg_output_t out = {buf, sizeof(buf)};
3151 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
3152 packmsg_add_str(&out, mesh->name);
3153 packmsg_add_str(&out, CORE_MESH);
3155 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3159 packmsg_add_int32(&out, mesh->self->devclass);
3160 packmsg_add_bool(&out, mesh->self->status.blacklisted);
3161 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
3163 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
3164 char *canonical_address = NULL;
3165 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
3166 packmsg_add_str(&out, canonical_address);
3167 free(canonical_address);
3169 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
3174 for(uint32_t i = 0; i < MAX_RECENT; i++) {
3175 if(mesh->self->recent[i].sa.sa_family) {
3182 packmsg_add_array(&out, count);
3184 for(uint32_t i = 0; i < count; i++) {
3185 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
3188 packmsg_add_int64(&out, 0);
3189 packmsg_add_int64(&out, 0);
3191 pthread_mutex_unlock(&mesh->mutex);
3193 if(!packmsg_output_ok(&out)) {
3194 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3195 meshlink_errno = MESHLINK_EINTERNAL;
3199 // Prepare a base64-encoded packmsg array containing our config file
3201 uint32_t len = packmsg_output_size(&out, buf);
3202 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
3203 uint8_t *buf2 = xmalloc(len2);
3204 packmsg_output_t out2 = {buf2, len2};
3205 packmsg_add_array(&out2, 1);
3206 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
3208 if(!packmsg_output_ok(&out2)) {
3209 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
3210 meshlink_errno = MESHLINK_EINTERNAL;
3215 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
3217 return (char *)buf2;
3220 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
3221 if(!mesh || !data) {
3222 meshlink_errno = MESHLINK_EINVAL;
3226 size_t datalen = strlen(data);
3227 uint8_t *buf = xmalloc(datalen);
3228 int buflen = b64decode(data, buf, datalen);
3231 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3232 meshlink_errno = MESHLINK_EPEER;
3236 packmsg_input_t in = {buf, buflen};
3237 uint32_t count = packmsg_get_array(&in);
3240 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
3241 meshlink_errno = MESHLINK_EPEER;
3245 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3251 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
3257 packmsg_input_t in2 = {data2, len2};
3258 uint32_t version = packmsg_get_uint32(&in2);
3259 char *name = packmsg_get_str_dup(&in2);
3261 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
3263 packmsg_input_invalidate(&in);
3267 if(!check_id(name)) {
3272 node_t *n = lookup_node(mesh, name);
3275 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
3283 config_t config = {data2, len2};
3285 if(!node_read_from_config(mesh, n, &config)) {
3287 packmsg_input_invalidate(&in);
3291 /* Clear the reachability times, since we ourself have never seen these nodes yet */
3292 n->last_reachable = 0;
3293 n->last_unreachable = 0;
3295 if(!node_write_config(mesh, n)) {
3303 pthread_mutex_unlock(&mesh->mutex);
3307 if(!packmsg_done(&in)) {
3308 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3309 meshlink_errno = MESHLINK_EPEER;
3313 if(!config_sync(mesh, "current")) {
3320 static bool blacklist(meshlink_handle_t *mesh, node_t *n) {
3321 if(n == mesh->self) {
3322 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", n->name);
3323 meshlink_errno = MESHLINK_EINVAL;
3327 if(n->status.blacklisted) {
3328 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", n->name);
3332 n->status.blacklisted = true;
3334 /* Immediately shut down any connections we have with the blacklisted node.
3335 * We can't call terminate_connection(), because we might be called from a callback function.
3337 for list_each(connection_t, c, mesh->connections) {
3339 shutdown(c->socket, SHUT_RDWR);
3343 utcp_abort_all_connections(n->utcp);
3349 n->status.udp_confirmed = false;
3351 if(n->status.reachable) {
3352 n->last_unreachable = time(NULL);
3355 /* Graph updates will suppress status updates for blacklisted nodes, so we need to
3356 * manually call the status callback if necessary.
3358 if(n->status.reachable && mesh->node_status_cb) {
3359 mesh->node_status_cb(mesh, (meshlink_node_t *)n, false);
3362 return node_write_config(mesh, n) && config_sync(mesh, "current");
3365 bool meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3366 if(!mesh || !node) {
3367 meshlink_errno = MESHLINK_EINVAL;
3371 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3375 if(!blacklist(mesh, (node_t *)node)) {
3376 pthread_mutex_unlock(&mesh->mutex);
3380 pthread_mutex_unlock(&mesh->mutex);
3382 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
3386 bool meshlink_blacklist_by_name(meshlink_handle_t *mesh, const char *name) {
3387 if(!mesh || !name) {
3388 meshlink_errno = MESHLINK_EINVAL;
3392 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3396 node_t *n = lookup_node(mesh, (char *)name);
3400 n->name = xstrdup(name);
3404 if(!blacklist(mesh, (node_t *)n)) {
3405 pthread_mutex_unlock(&mesh->mutex);
3409 pthread_mutex_unlock(&mesh->mutex);
3411 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", name);
3415 static bool whitelist(meshlink_handle_t *mesh, node_t *n) {
3416 if(n == mesh->self) {
3417 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", n->name);
3418 meshlink_errno = MESHLINK_EINVAL;
3422 if(!n->status.blacklisted) {
3423 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", n->name);
3427 n->status.blacklisted = false;
3429 if(n->status.reachable) {
3430 n->last_reachable = time(NULL);
3431 update_node_status(mesh, n);
3434 return node_write_config(mesh, n) && config_sync(mesh, "current");
3437 bool meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
3438 if(!mesh || !node) {
3439 meshlink_errno = MESHLINK_EINVAL;
3443 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3447 if(!whitelist(mesh, (node_t *)node)) {
3448 pthread_mutex_unlock(&mesh->mutex);
3452 pthread_mutex_unlock(&mesh->mutex);
3454 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
3458 bool meshlink_whitelist_by_name(meshlink_handle_t *mesh, const char *name) {
3459 if(!mesh || !name) {
3460 meshlink_errno = MESHLINK_EINVAL;
3464 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3468 node_t *n = lookup_node(mesh, (char *)name);
3472 n->name = xstrdup(name);
3476 if(!whitelist(mesh, (node_t *)n)) {
3477 pthread_mutex_unlock(&mesh->mutex);
3481 pthread_mutex_unlock(&mesh->mutex);
3483 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", name);
3487 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
3488 mesh->default_blacklist = blacklist;
3491 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3492 if(!mesh || !node) {
3493 meshlink_errno = MESHLINK_EINVAL;
3497 node_t *n = (node_t *)node;
3499 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3503 /* Check that the node is not reachable */
3504 if(n->status.reachable || n->connection) {
3505 pthread_mutex_unlock(&mesh->mutex);
3506 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3510 /* Check that we don't have any active UTCP connections */
3511 if(n->utcp && utcp_is_active(n->utcp)) {
3512 pthread_mutex_unlock(&mesh->mutex);
3513 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3517 /* Check that we have no active connections to this node */
3518 for list_each(connection_t, c, mesh->connections) {
3520 pthread_mutex_unlock(&mesh->mutex);
3521 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3526 /* Remove any pending outgoings to this node */
3527 if(mesh->outgoings) {
3528 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3529 if(outgoing->node == n) {
3530 list_delete_node(mesh->outgoings, list_node);
3535 /* Delete the config file for this node */
3536 if(!config_delete(mesh, "current", n->name)) {
3537 pthread_mutex_unlock(&mesh->mutex);
3541 /* Delete the node struct and any remaining edges referencing this node */
3544 pthread_mutex_unlock(&mesh->mutex);
3546 return config_sync(mesh, "current");
3549 /* Hint that a hostname may be found at an address
3550 * See header file for detailed comment.
3552 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3553 if(!mesh || !node || !addr) {
3554 meshlink_errno = EINVAL;
3558 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3562 node_t *n = (node_t *)node;
3564 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3565 if(!node_write_config(mesh, n)) {
3566 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3570 pthread_mutex_unlock(&mesh->mutex);
3571 // @TODO do we want to fire off a connection attempt right away?
3574 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3576 node_t *n = utcp->priv;
3577 meshlink_handle_t *mesh = n->mesh;
3578 return mesh->channel_accept_cb;
3581 /* Finish one AIO buffer, return true if the channel is still open. */
3582 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3583 meshlink_aio_buffer_t *aio = *head;
3587 channel->in_callback = true;
3590 if(aio->cb.buffer) {
3591 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3595 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3599 channel->in_callback = false;
3612 /* Finish all AIO buffers, return true if the channel is still open. */
3613 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3615 if(!aio_finish_one(mesh, channel, head)) {
3623 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3624 meshlink_channel_t *channel = connection->priv;
3630 node_t *n = channel->node;
3631 meshlink_handle_t *mesh = n->mesh;
3633 if(n->status.destroyed) {
3634 meshlink_channel_close(mesh, channel);
3638 const char *p = data;
3641 while(channel->aio_receive) {
3643 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3644 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3651 meshlink_aio_buffer_t *aio = channel->aio_receive;
3652 size_t todo = aio->len - aio->done;
3659 memcpy((char *)aio->data + aio->done, p, todo);
3661 ssize_t result = write(aio->fd, p, todo);
3664 if(result < 0 && errno == EINTR) {
3668 /* Writing to fd failed, cancel just this AIO buffer. */
3669 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3671 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3685 if(aio->done == aio->len) {
3686 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3696 if(channel->receive_cb) {
3697 channel->receive_cb(mesh, channel, p, left);
3703 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3704 node_t *n = utcp_connection->utcp->priv;
3710 meshlink_handle_t *mesh = n->mesh;
3712 if(!mesh->channel_accept_cb) {
3716 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3718 channel->c = utcp_connection;
3720 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3721 utcp_accept(utcp_connection, channel_recv, channel);
3727 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3728 node_t *n = utcp_connection->utcp->priv;
3729 meshlink_handle_t *mesh = n->mesh;
3731 if(n->mtuprobes == 31) {
3732 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3738 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3739 node_t *n = utcp->priv;
3741 if(n->status.destroyed) {
3745 meshlink_handle_t *mesh = n->mesh;
3746 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3749 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3750 if(!mesh || !channel) {
3751 meshlink_errno = MESHLINK_EINVAL;
3755 channel->receive_cb = cb;
3758 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3760 node_t *n = (node_t *)source;
3766 utcp_recv(n->utcp, data, len);
3769 static void channel_poll(struct utcp_connection *connection, size_t len) {
3770 meshlink_channel_t *channel = connection->priv;
3776 node_t *n = channel->node;
3777 meshlink_handle_t *mesh = n->mesh;
3779 while(channel->aio_send) {
3781 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3782 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3789 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3790 meshlink_aio_buffer_t *aio = channel->aio_send;
3791 size_t todo = aio->len - aio->done;
3799 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3801 /* Limit the amount we read at once to avoid stack overflows */
3807 ssize_t result = read(aio->fd, buf, todo);
3811 sent = utcp_send(connection, buf, todo);
3813 if(result < 0 && errno == EINTR) {
3817 /* Reading from fd failed, cancel just this AIO buffer. */
3819 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3822 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3830 if(sent != (ssize_t)todo) {
3831 /* We should never get a partial send at this point */
3834 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3835 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3846 /* If we didn't finish this buffer, exit early. */
3847 if(aio->done < aio->len) {
3851 /* Signal completion of this buffer, and go to the next one. */
3852 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3861 if(channel->poll_cb) {
3862 channel->poll_cb(mesh, channel, len);
3864 utcp_set_poll_cb(connection, NULL);
3868 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3869 if(!mesh || !channel) {
3870 meshlink_errno = MESHLINK_EINVAL;
3874 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3878 channel->poll_cb = cb;
3879 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3880 pthread_mutex_unlock(&mesh->mutex);
3883 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3885 meshlink_errno = MESHLINK_EINVAL;
3889 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3893 mesh->channel_accept_cb = cb;
3894 mesh->receive_cb = channel_receive;
3896 for splay_each(node_t, n, mesh->nodes) {
3897 if(!n->utcp && n != mesh->self) {
3898 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3899 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3900 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3904 pthread_mutex_unlock(&mesh->mutex);
3907 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3911 meshlink_errno = MESHLINK_EINVAL;
3915 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3919 utcp_set_sndbuf(channel->c, size);
3920 pthread_mutex_unlock(&mesh->mutex);
3923 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3927 meshlink_errno = MESHLINK_EINVAL;
3931 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3935 utcp_set_rcvbuf(channel->c, size);
3936 pthread_mutex_unlock(&mesh->mutex);
3939 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) {
3941 abort(); // TODO: handle non-NULL data
3944 if(!mesh || !node) {
3945 meshlink_errno = MESHLINK_EINVAL;
3949 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3953 node_t *n = (node_t *)node;
3956 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3957 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3958 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3959 mesh->receive_cb = channel_receive;
3962 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3963 pthread_mutex_unlock(&mesh->mutex);
3968 if(n->status.blacklisted) {
3969 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3970 meshlink_errno = MESHLINK_EBLACKLISTED;
3971 pthread_mutex_unlock(&mesh->mutex);
3975 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3977 channel->receive_cb = cb;
3980 channel->priv = (void *)data;
3983 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3985 pthread_mutex_unlock(&mesh->mutex);
3988 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3996 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) {
3997 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
4000 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
4001 if(!mesh || !channel) {
4002 meshlink_errno = MESHLINK_EINVAL;
4006 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4010 utcp_shutdown(channel->c, direction);
4011 pthread_mutex_unlock(&mesh->mutex);
4014 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4015 if(!mesh || !channel) {
4016 meshlink_errno = MESHLINK_EINVAL;
4020 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4025 utcp_close(channel->c);
4028 /* Clean up any outstanding AIO buffers. */
4029 aio_abort(mesh, channel, &channel->aio_send);
4030 aio_abort(mesh, channel, &channel->aio_receive);
4033 if(!channel->in_callback) {
4037 pthread_mutex_unlock(&mesh->mutex);
4040 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
4041 if(!mesh || !channel) {
4042 meshlink_errno = MESHLINK_EINVAL;
4051 meshlink_errno = MESHLINK_EINVAL;
4055 // TODO: more finegrained locking.
4056 // Ideally we want to put the data into the UTCP connection's send buffer.
4057 // Then, preferably only if there is room in the receiver window,
4058 // kick the meshlink thread to go send packets.
4062 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4066 /* Disallow direct calls to utcp_send() while we still have AIO active. */
4067 if(channel->aio_send) {
4070 retval = utcp_send(channel->c, data, len);
4073 pthread_mutex_unlock(&mesh->mutex);
4076 meshlink_errno = MESHLINK_ENETWORK;
4082 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) {
4083 if(!mesh || !channel) {
4084 meshlink_errno = MESHLINK_EINVAL;
4089 meshlink_errno = MESHLINK_EINVAL;
4093 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4096 aio->cb.buffer = cb;
4099 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4103 /* Append the AIO buffer descriptor to the end of the chain */
4104 meshlink_aio_buffer_t **p = &channel->aio_send;
4112 /* Ensure the poll callback is set, and call it right now to push data if possible */
4113 utcp_set_poll_cb(channel->c, channel_poll);
4114 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
4117 channel_poll(channel->c, todo);
4120 pthread_mutex_unlock(&mesh->mutex);
4125 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) {
4126 if(!mesh || !channel) {
4127 meshlink_errno = MESHLINK_EINVAL;
4131 if(!len || fd == -1) {
4132 meshlink_errno = MESHLINK_EINVAL;
4136 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4142 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4146 /* Append the AIO buffer descriptor to the end of the chain */
4147 meshlink_aio_buffer_t **p = &channel->aio_send;
4155 /* Ensure the poll callback is set, and call it right now to push data if possible */
4156 utcp_set_poll_cb(channel->c, channel_poll);
4157 size_t left = utcp_get_rcvbuf_free(channel->c);
4160 channel_poll(channel->c, left);
4163 pthread_mutex_unlock(&mesh->mutex);
4168 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) {
4169 if(!mesh || !channel) {
4170 meshlink_errno = MESHLINK_EINVAL;
4175 meshlink_errno = MESHLINK_EINVAL;
4179 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4182 aio->cb.buffer = cb;
4185 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4189 /* Append the AIO buffer descriptor to the end of the chain */
4190 meshlink_aio_buffer_t **p = &channel->aio_receive;
4198 pthread_mutex_unlock(&mesh->mutex);
4203 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) {
4204 if(!mesh || !channel) {
4205 meshlink_errno = MESHLINK_EINVAL;
4209 if(!len || fd == -1) {
4210 meshlink_errno = MESHLINK_EINVAL;
4214 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
4220 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4224 /* Append the AIO buffer descriptor to the end of the chain */
4225 meshlink_aio_buffer_t **p = &channel->aio_receive;
4233 pthread_mutex_unlock(&mesh->mutex);
4238 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4239 if(!mesh || !channel) {
4240 meshlink_errno = MESHLINK_EINVAL;
4244 return channel->c->flags;
4247 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4248 if(!mesh || !channel) {
4249 meshlink_errno = MESHLINK_EINVAL;
4253 return utcp_get_sendq(channel->c);
4256 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4257 if(!mesh || !channel) {
4258 meshlink_errno = MESHLINK_EINVAL;
4262 return utcp_get_recvq(channel->c);
4265 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
4266 if(!mesh || !channel) {
4267 meshlink_errno = MESHLINK_EINVAL;
4271 return utcp_get_mss(channel->node->utcp);
4274 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
4275 if(!mesh || !node) {
4276 meshlink_errno = MESHLINK_EINVAL;
4280 node_t *n = (node_t *)node;
4282 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4287 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4288 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4289 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4292 utcp_set_user_timeout(n->utcp, timeout);
4294 pthread_mutex_unlock(&mesh->mutex);
4297 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
4298 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
4299 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
4300 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
4301 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
4304 if(mesh->node_status_cb) {
4305 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
4308 if(mesh->node_pmtu_cb) {
4309 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4313 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
4314 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
4316 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
4317 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
4321 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
4322 if(!mesh->node_duplicate_cb || n->status.duplicate) {
4326 n->status.duplicate = true;
4327 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
4330 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
4334 meshlink_errno = MESHLINK_EINVAL;
4338 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4342 if(mesh->discovery == enable) {
4346 if(mesh->threadstarted) {
4348 discovery_start(mesh);
4350 discovery_stop(mesh);
4354 mesh->discovery = enable;
4357 pthread_mutex_unlock(&mesh->mutex);
4361 meshlink_errno = MESHLINK_ENOTSUP;
4365 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
4366 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4367 meshlink_errno = EINVAL;
4371 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
4372 meshlink_errno = EINVAL;
4376 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4380 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
4381 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
4382 pthread_mutex_unlock(&mesh->mutex);
4385 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4386 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4387 meshlink_errno = EINVAL;
4391 if(fast_retry_period < 0) {
4392 meshlink_errno = EINVAL;
4396 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4400 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4401 pthread_mutex_unlock(&mesh->mutex);
4404 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4405 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4406 meshlink_errno = EINVAL;
4410 if(maxtimeout < 0) {
4411 meshlink_errno = EINVAL;
4415 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4419 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4420 pthread_mutex_unlock(&mesh->mutex);
4423 extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4425 meshlink_errno = EINVAL;
4429 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4433 mesh->inviter_commits_first = inviter_commits_first;
4434 pthread_mutex_unlock(&mesh->mutex);
4437 void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url) {
4439 meshlink_errno = EINVAL;
4443 if(url && (strncmp(url, "http://", 7) || strchr(url, ' '))) {
4444 meshlink_errno = EINVAL;
4448 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4452 free(mesh->external_address_url);
4453 mesh->external_address_url = url ? xstrdup(url) : NULL;
4454 pthread_mutex_unlock(&mesh->mutex);
4457 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4458 if(!mesh || granularity < 0) {
4459 meshlink_errno = EINVAL;
4463 utcp_set_clock_granularity(granularity);
4466 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4469 if(!mesh->connections || !mesh->loop.running) {
4474 signal_trigger(&mesh->loop, &mesh->datafromapp);
4477 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4478 // We should only call the callback function if we are in the background thread.
4479 if(!mesh->error_cb) {
4483 if(!mesh->threadstarted) {
4487 if(mesh->thread == pthread_self()) {
4488 mesh->error_cb(mesh, cb_errno);
4492 static void __attribute__((constructor)) meshlink_init(void) {
4494 utcp_set_clock_granularity(10000);
4497 static void __attribute__((destructor)) meshlink_exit(void) {