2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2021 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
38 #include "ed25519/sha512.h"
42 #define MSG_NOSIGNAL 0
44 __thread meshlink_errno_t meshlink_errno;
45 meshlink_log_cb_t global_log_cb;
46 meshlink_log_level_t global_log_level;
48 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
50 static int rstrip(char *value) {
51 int len = strlen(value);
53 while(len && strchr("\t\r\n ", value[len - 1])) {
60 static bool is_valid_hostname(const char *hostname) {
65 for(const char *p = hostname; *p; p++) {
66 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
74 static bool is_valid_port(const char *port) {
81 unsigned long int result = strtoul(port, &end, 10);
82 return result && result < 65536 && !*end;
85 for(const char *p = port; *p; p++) {
86 if(!(isalnum(*p) || *p == '-')) {
94 static void set_timeout(int sock, int timeout) {
99 tv.tv_sec = timeout / 1000;
100 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
102 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
103 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
106 struct socket_in_netns_params {
115 static void *socket_in_netns_thread(void *arg) {
116 struct socket_in_netns_params *params = arg;
118 if(setns(params->netns, CLONE_NEWNET) == -1) {
119 meshlink_errno = MESHLINK_EINVAL;
123 params->fd = socket(params->domain, params->type, params->protocol);
129 static int socket_in_netns(int domain, int type, int protocol, int netns) {
131 return socket(domain, type, protocol);
135 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
139 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
140 if(pthread_join(thr, NULL) != 0) {
152 // Find out what local address a socket would use if we connect to the given address.
153 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
154 // of both endpoints, but this will actually not send any UDP packet.
155 static bool getlocaladdr(const char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
156 struct addrinfo *rai = NULL;
157 const struct addrinfo hint = {
158 .ai_family = AF_UNSPEC,
159 .ai_socktype = SOCK_DGRAM,
160 .ai_protocol = IPPROTO_UDP,
161 .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
164 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
168 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
175 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
183 if(getsockname(sock, &sa->sa, salen)) {
192 static bool getlocaladdrname(const char *destaddr, char *host, socklen_t hostlen, int netns) {
194 socklen_t salen = sizeof(sa);
196 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
200 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
207 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
208 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
211 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
212 logger(mesh, MESHLINK_DEBUG, "meshlink_get_external_address_for_family(%d)", family);
213 const char *url = mesh->external_address_url;
216 url = "http://meshlink.io/host.cgi";
219 /* Find the hostname part between the slashes */
220 if(strncmp(url, "http://", 7)) {
222 meshlink_errno = MESHLINK_EINTERNAL;
226 const char *begin = url + 7;
228 const char *end = strchr(begin, '/');
231 end = begin + strlen(begin);
235 char host[end - begin + 1];
236 strncpy(host, begin, end - begin);
237 host[end - begin] = 0;
239 char *port = strchr(host, ':');
245 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
246 struct addrinfo *ai = str2addrinfo(host, port ? port : "80", SOCK_STREAM);
248 char *hostname = NULL;
250 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
251 if(family != AF_UNSPEC && aip->ai_family != family) {
255 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
259 setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
263 set_timeout(s, 5000);
265 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
272 send(s, "GET ", 4, 0);
273 send(s, url, strlen(url), 0);
274 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
275 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
280 if(line[len - 1] == '\n') {
284 char *p = strrchr(line, '\n');
287 hostname = xstrdup(p + 1);
303 // Check that the hostname is reasonable
304 if(hostname && !is_valid_hostname(hostname)) {
310 meshlink_errno = MESHLINK_ERESOLV;
316 static bool is_localaddr(sockaddr_t *sa) {
317 switch(sa->sa.sa_family) {
319 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
322 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
323 return first == 0 || (first & 0xffc0) == 0xfe80;
331 #ifdef HAVE_GETIFADDRS
332 struct getifaddrs_in_netns_params {
333 struct ifaddrs **ifa;
338 static void *getifaddrs_in_netns_thread(void *arg) {
339 struct getifaddrs_in_netns_params *params = arg;
341 if(setns(params->netns, CLONE_NEWNET) == -1) {
342 meshlink_errno = MESHLINK_EINVAL;
346 if(getifaddrs(params->ifa) != 0) {
354 static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) {
356 return getifaddrs(ifa);
360 struct getifaddrs_in_netns_params params = {ifa, netns};
363 if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) {
364 if(pthread_join(thr, NULL) != 0) {
369 return *params.ifa ? 0 : -1;
377 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
378 logger(mesh, MESHLINK_DEBUG, "meshlink_get_local_address_for_family(%d)", family);
381 meshlink_errno = MESHLINK_EINVAL;
385 // Determine address of the local interface used for outgoing connections.
386 char localaddr[NI_MAXHOST];
387 bool success = false;
389 if(family == AF_INET) {
390 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
391 } else if(family == AF_INET6) {
392 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
395 #ifdef HAVE_GETIFADDRS
398 struct ifaddrs *ifa = NULL;
399 getifaddrs_in_netns(&ifa, mesh->netns);
401 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
402 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
404 if(!sa || sa->sa.sa_family != family) {
408 if(is_localaddr(sa)) {
412 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
424 meshlink_errno = MESHLINK_ENETWORK;
428 return xstrdup(localaddr);
431 static bool write_main_config_files(meshlink_handle_t *mesh) {
432 if(!mesh->confbase) {
438 /* Write the main config file */
439 packmsg_output_t out = {buf, sizeof buf};
441 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
442 packmsg_add_str(&out, mesh->name);
443 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
444 packmsg_add_nil(&out); // Invitation keys are not supported
445 packmsg_add_uint16(&out, atoi(mesh->myport));
447 if(!packmsg_output_ok(&out)) {
451 config_t config = {buf, packmsg_output_size(&out, buf)};
453 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
457 /* Write our own host config file */
458 if(!node_write_config(mesh, mesh->self, true)) {
466 meshlink_handle_t *mesh;
468 char cookie[18 + 32];
479 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
480 meshlink_handle_t *mesh = state->mesh;
481 packmsg_input_t in = {buf, len};
482 uint32_t version = packmsg_get_uint32(&in);
484 if(version != MESHLINK_INVITATION_VERSION) {
485 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
489 char *name = packmsg_get_str_dup(&in);
490 char *submesh_name = packmsg_get_str_dup(&in);
491 dev_class_t devclass = packmsg_get_int32(&in);
492 uint32_t count = packmsg_get_array(&in);
494 if(!name || !check_id(name)) {
495 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
501 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
502 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
509 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
516 free(mesh->self->name);
518 mesh->self->name = xstrdup(name);
519 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
521 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
523 // Initialize configuration directory
524 if(!config_init(mesh, "current")) {
528 if(!write_main_config_files(mesh)) {
532 // Write host config files
533 for(uint32_t i = 0; i < count; i++) {
535 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
538 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
542 packmsg_input_t in2 = {data, data_len};
543 uint32_t version2 = packmsg_get_uint32(&in2);
544 char *name2 = packmsg_get_str_dup(&in2);
546 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
548 packmsg_input_invalidate(&in);
552 if(!check_id(name2)) {
557 if(!strcmp(name2, mesh->name)) {
558 logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n");
560 meshlink_errno = MESHLINK_EPEER;
564 node_t *n = new_node();
567 config_t config = {data, data_len};
569 if(!node_read_from_config(mesh, n, &config)) {
571 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
572 meshlink_errno = MESHLINK_EPEER;
577 /* The first host config file is of the inviter itself;
578 * remember the address we are currently using for the invitation connection.
581 socklen_t salen = sizeof(sa);
583 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
584 node_add_recent_address(mesh, n, &sa);
588 if(!node_write_config(mesh, n, true)) {
596 /* Ensure the configuration directory metadata is on disk */
597 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
601 if(!mesh->inviter_commits_first) {
602 devtool_set_inviter_commits_first(false);
605 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
607 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
612 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
614 join_state_t *state = handle;
615 const char *ptr = data;
618 int result = send(state->sock, ptr, len, 0);
620 if(result == -1 && errno == EINTR) {
622 } else if(result <= 0) {
633 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
634 join_state_t *state = handle;
635 meshlink_handle_t *mesh = state->mesh;
637 if(mesh->inviter_commits_first) {
639 case SPTPS_HANDSHAKE:
640 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
646 if(!finalize_join(state, msg, len)) {
650 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
651 shutdown(state->sock, SHUT_RDWR);
652 state->success = true;
660 case SPTPS_HANDSHAKE:
661 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
664 return finalize_join(state, msg, len);
667 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
668 shutdown(state->sock, SHUT_RDWR);
669 state->success = true;
680 static bool recvline(join_state_t *state) {
681 char *newline = NULL;
683 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
684 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
686 if(result == -1 && errno == EINTR) {
688 } else if(result <= 0) {
692 state->blen += result;
695 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
699 size_t len = newline - state->buffer;
701 memcpy(state->line, state->buffer, len);
702 state->line[len] = 0;
703 memmove(state->buffer, newline + 1, state->blen - len - 1);
704 state->blen -= len + 1;
709 static bool sendline(int fd, const char *format, ...) {
715 va_start(ap, format);
716 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
719 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
727 int result = send(fd, p, blen, MSG_NOSIGNAL);
729 if(result == -1 && errno == EINTR) {
731 } else if(result <= 0) {
742 static const char *errstr[] = {
743 [MESHLINK_OK] = "No error",
744 [MESHLINK_EINVAL] = "Invalid argument",
745 [MESHLINK_ENOMEM] = "Out of memory",
746 [MESHLINK_ENOENT] = "No such node",
747 [MESHLINK_EEXIST] = "Node already exists",
748 [MESHLINK_EINTERNAL] = "Internal error",
749 [MESHLINK_ERESOLV] = "Could not resolve hostname",
750 [MESHLINK_ESTORAGE] = "Storage error",
751 [MESHLINK_ENETWORK] = "Network error",
752 [MESHLINK_EPEER] = "Error communicating with peer",
753 [MESHLINK_ENOTSUP] = "Operation not supported",
754 [MESHLINK_EBUSY] = "MeshLink instance already in use",
755 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
758 const char *meshlink_strerror(meshlink_errno_t err) {
759 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
760 return "Invalid error code";
766 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
767 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
769 mesh->private_key = ecdsa_generate();
771 if(!mesh->private_key) {
772 logger(mesh, MESHLINK_ERROR, "Error during key generation!\n");
773 meshlink_errno = MESHLINK_EINTERNAL;
777 logger(mesh, MESHLINK_DEBUG, "Done.\n");
782 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
783 if(a->tv_sec == b->tv_sec) {
784 return a->tv_nsec < b->tv_nsec;
786 return a->tv_sec < b->tv_sec;
790 static struct timespec idle(event_loop_t *loop, void *data) {
792 meshlink_handle_t *mesh = data;
793 struct timespec t, tmin = {3600, 0};
795 for splay_each(node_t, n, mesh->nodes) {
800 t = utcp_timeout(n->utcp);
802 if(timespec_lt(&t, &tmin)) {
810 // Get our local address(es) by simulating connecting to an Internet host.
811 static void add_local_addresses(meshlink_handle_t *mesh) {
813 sa.storage.ss_family = AF_UNKNOWN;
814 socklen_t salen = sizeof(sa);
818 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
819 sa.in.sin_port = ntohs(atoi(mesh->myport));
820 node_add_recent_address(mesh, mesh->self, &sa);
827 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
828 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
829 node_add_recent_address(mesh, mesh->self, &sa);
833 static bool meshlink_setup(meshlink_handle_t *mesh) {
834 if(!config_destroy(mesh->confbase, "new")) {
835 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
836 meshlink_errno = MESHLINK_ESTORAGE;
840 if(!config_destroy(mesh->confbase, "old")) {
841 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
842 meshlink_errno = MESHLINK_ESTORAGE;
846 if(!config_init(mesh, "current")) {
847 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
848 meshlink_errno = MESHLINK_ESTORAGE;
852 if(!ecdsa_keygen(mesh)) {
853 meshlink_errno = MESHLINK_EINTERNAL;
857 mesh->myport = xstrdup("0");
859 /* Create a node for ourself */
861 mesh->self = new_node();
862 mesh->self->name = xstrdup(mesh->name);
863 mesh->self->devclass = mesh->devclass;
864 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
865 mesh->self->session_id = mesh->session_id;
867 if(!write_main_config_files(mesh)) {
868 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
869 meshlink_errno = MESHLINK_ESTORAGE;
873 /* Ensure the configuration directory metadata is on disk */
874 if(!config_sync(mesh, "current")) {
881 static bool meshlink_read_config(meshlink_handle_t *mesh) {
884 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
885 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
889 packmsg_input_t in = {config.buf, config.len};
890 const void *private_key;
892 uint32_t version = packmsg_get_uint32(&in);
893 char *name = packmsg_get_str_dup(&in);
894 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
895 packmsg_skip_element(&in); // Invitation key is not supported
896 uint16_t myport = packmsg_get_uint16(&in);
898 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96) {
899 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
901 config_free(&config);
905 if(mesh->name && strcmp(mesh->name, name)) {
906 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
907 meshlink_errno = MESHLINK_ESTORAGE;
909 config_free(&config);
915 xasprintf(&mesh->myport, "%u", myport);
916 mesh->private_key = ecdsa_set_private_key(private_key);
917 config_free(&config);
919 /* Create a node for ourself and read our host configuration file */
921 mesh->self = new_node();
922 mesh->self->name = xstrdup(name);
923 mesh->self->devclass = mesh->devclass;
924 mesh->self->session_id = mesh->session_id;
926 if(!node_read_public_key(mesh, mesh->self)) {
927 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
928 meshlink_errno = MESHLINK_ESTORAGE;
929 free_node(mesh->self);
938 static void *setup_network_in_netns_thread(void *arg) {
939 meshlink_handle_t *mesh = arg;
941 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
945 bool success = setup_network(mesh);
946 return success ? arg : NULL;
950 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
951 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass);
953 if(!confbase || !*confbase) {
954 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
955 meshlink_errno = MESHLINK_EINVAL;
959 if(!appname || !*appname) {
960 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
961 meshlink_errno = MESHLINK_EINVAL;
965 if(strchr(appname, ' ')) {
966 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
967 meshlink_errno = MESHLINK_EINVAL;
971 if(name && !check_id(name)) {
972 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
973 meshlink_errno = MESHLINK_EINVAL;
977 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
978 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
979 meshlink_errno = MESHLINK_EINVAL;
983 meshlink_open_params_t *params = xzalloc(sizeof * params);
985 params->confbase = xstrdup(confbase);
986 params->name = name ? xstrdup(name) : NULL;
987 params->appname = xstrdup(appname);
988 params->devclass = devclass;
991 xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase);
996 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
997 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns);
1000 meshlink_errno = MESHLINK_EINVAL;
1004 params->netns = netns;
1009 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1010 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen);
1013 meshlink_errno = MESHLINK_EINVAL;
1017 if((!key && keylen) || (key && !keylen)) {
1018 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1019 meshlink_errno = MESHLINK_EINVAL;
1024 params->keylen = keylen;
1029 bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) {
1030 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy);
1033 meshlink_errno = MESHLINK_EINVAL;
1037 params->storage_policy = policy;
1042 bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) {
1043 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename);
1045 if(!params || !filename) {
1046 meshlink_errno = MESHLINK_EINVAL;
1050 free(params->lock_filename);
1051 params->lock_filename = xstrdup(filename);
1056 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1057 logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen);
1059 if(!mesh || !new_key || !new_keylen) {
1060 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1061 meshlink_errno = MESHLINK_EINVAL;
1065 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1069 // Create hash for the new key
1070 void *new_config_key;
1071 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1073 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1074 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1075 meshlink_errno = MESHLINK_EINTERNAL;
1076 pthread_mutex_unlock(&mesh->mutex);
1080 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1082 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1083 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1084 meshlink_errno = MESHLINK_ESTORAGE;
1085 pthread_mutex_unlock(&mesh->mutex);
1089 devtool_keyrotate_probe(1);
1091 // Rename confbase/current/ to confbase/old
1093 if(!config_rename(mesh, "current", "old")) {
1094 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1095 meshlink_errno = MESHLINK_ESTORAGE;
1096 pthread_mutex_unlock(&mesh->mutex);
1100 devtool_keyrotate_probe(2);
1102 // Rename confbase/new/ to confbase/current
1104 if(!config_rename(mesh, "new", "current")) {
1105 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1106 meshlink_errno = MESHLINK_ESTORAGE;
1107 pthread_mutex_unlock(&mesh->mutex);
1111 devtool_keyrotate_probe(3);
1113 // Cleanup the "old" confbase sub-directory
1115 if(!config_destroy(mesh->confbase, "old")) {
1116 pthread_mutex_unlock(&mesh->mutex);
1120 // Change the mesh handle key with new key
1122 free(mesh->config_key);
1123 mesh->config_key = new_config_key;
1125 pthread_mutex_unlock(&mesh->mutex);
1130 void meshlink_open_params_free(meshlink_open_params_t *params) {
1131 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()");
1134 meshlink_errno = MESHLINK_EINVAL;
1138 free(params->confbase);
1140 free(params->appname);
1141 free(params->lock_filename);
1146 /// Device class traits
1147 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1148 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1149 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1150 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1151 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1154 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1155 logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass);
1157 if(!confbase || !*confbase) {
1158 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1159 meshlink_errno = MESHLINK_EINVAL;
1163 char lock_filename[PATH_MAX];
1164 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1166 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1167 meshlink_open_params_t params = {
1168 .confbase = (char *)confbase,
1169 .lock_filename = lock_filename,
1170 .name = (char *)name,
1171 .appname = (char *)appname,
1172 .devclass = devclass,
1176 return meshlink_open_ex(¶ms);
1179 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) {
1180 logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen);
1182 if(!confbase || !*confbase) {
1183 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1184 meshlink_errno = MESHLINK_EINVAL;
1188 char lock_filename[PATH_MAX];
1189 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1191 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1192 meshlink_open_params_t params = {
1193 .confbase = (char *)confbase,
1194 .lock_filename = lock_filename,
1195 .name = (char *)name,
1196 .appname = (char *)appname,
1197 .devclass = devclass,
1201 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1205 return meshlink_open_ex(¶ms);
1208 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1209 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass);
1212 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1213 meshlink_errno = MESHLINK_EINVAL;
1217 if(!check_id(name)) {
1218 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1219 meshlink_errno = MESHLINK_EINVAL;
1223 if(!appname || !*appname) {
1224 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1225 meshlink_errno = MESHLINK_EINVAL;
1229 if(strchr(appname, ' ')) {
1230 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1231 meshlink_errno = MESHLINK_EINVAL;
1235 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1236 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1237 meshlink_errno = MESHLINK_EINVAL;
1241 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1242 meshlink_open_params_t params = {
1243 .name = (char *)name,
1244 .appname = (char *)appname,
1245 .devclass = devclass,
1249 return meshlink_open_ex(¶ms);
1252 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1253 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()");
1255 // Validate arguments provided by the application
1256 if(!params->appname || !*params->appname) {
1257 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1258 meshlink_errno = MESHLINK_EINVAL;
1262 if(strchr(params->appname, ' ')) {
1263 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1264 meshlink_errno = MESHLINK_EINVAL;
1268 if(params->name && !check_id(params->name)) {
1269 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1270 meshlink_errno = MESHLINK_EINVAL;
1274 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1275 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1276 meshlink_errno = MESHLINK_EINVAL;
1280 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1281 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1282 meshlink_errno = MESHLINK_EINVAL;
1286 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1288 if(params->confbase) {
1289 mesh->confbase = xstrdup(params->confbase);
1292 mesh->appname = xstrdup(params->appname);
1293 mesh->devclass = params->devclass;
1294 mesh->netns = params->netns;
1295 mesh->submeshes = NULL;
1296 mesh->log_cb = global_log_cb;
1297 mesh->log_level = global_log_level;
1298 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1300 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1303 randomize(&mesh->session_id, sizeof(mesh->session_id));
1304 } while(mesh->session_id == 0);
1306 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1308 mesh->name = params->name ? xstrdup(params->name) : NULL;
1312 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1314 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1315 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1316 meshlink_close(mesh);
1317 meshlink_errno = MESHLINK_EINTERNAL;
1322 // initialize mutexes and conds
1323 pthread_mutexattr_t attr;
1324 pthread_mutexattr_init(&attr);
1326 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1330 pthread_mutex_init(&mesh->mutex, &attr);
1331 pthread_cond_init(&mesh->cond, NULL);
1333 mesh->threadstarted = false;
1334 event_loop_init(&mesh->loop);
1335 mesh->loop.data = mesh;
1337 meshlink_queue_init(&mesh->outpacketqueue);
1339 // Atomically lock the configuration directory.
1340 if(!main_config_lock(mesh, params->lock_filename)) {
1341 meshlink_close(mesh);
1345 // If no configuration exists yet, create it.
1347 bool new_configuration = false;
1349 if(!meshlink_confbase_exists(mesh)) {
1351 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1352 meshlink_close(mesh);
1353 meshlink_errno = MESHLINK_ESTORAGE;
1357 if(!meshlink_setup(mesh)) {
1358 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1359 meshlink_close(mesh);
1363 new_configuration = true;
1365 if(!meshlink_read_config(mesh)) {
1366 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1367 meshlink_close(mesh);
1372 mesh->storage_policy = params->storage_policy;
1375 struct WSAData wsa_state;
1376 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1379 // Setup up everything
1380 // TODO: we should not open listening sockets yet
1382 bool success = false;
1384 if(mesh->netns != -1) {
1388 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1389 void *retval = NULL;
1390 success = pthread_join(thr, &retval) == 0 && retval;
1394 meshlink_errno = MESHLINK_EINTERNAL;
1397 #endif // HAVE_SETNS
1399 success = setup_network(mesh);
1403 meshlink_close(mesh);
1404 meshlink_errno = MESHLINK_ENETWORK;
1408 add_local_addresses(mesh);
1410 if(!node_write_config(mesh, mesh->self, new_configuration)) {
1411 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1415 idle_set(&mesh->loop, idle, mesh);
1417 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1421 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1422 logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh);
1424 meshlink_submesh_t *s = NULL;
1427 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1428 meshlink_errno = MESHLINK_EINVAL;
1432 if(!submesh || !*submesh) {
1433 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1434 meshlink_errno = MESHLINK_EINVAL;
1439 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1443 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1445 pthread_mutex_unlock(&mesh->mutex);
1450 static void *meshlink_main_loop(void *arg) {
1451 meshlink_handle_t *mesh = arg;
1453 if(mesh->netns != -1) {
1456 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1457 pthread_cond_signal(&mesh->cond);
1462 pthread_cond_signal(&mesh->cond);
1464 #endif // HAVE_SETNS
1467 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1471 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1472 pthread_cond_broadcast(&mesh->cond);
1474 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1476 pthread_mutex_unlock(&mesh->mutex);
1481 bool meshlink_start(meshlink_handle_t *mesh) {
1483 meshlink_errno = MESHLINK_EINVAL;
1487 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1489 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1494 assert(mesh->private_key);
1495 assert(mesh->self->ecdsa);
1496 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1498 if(mesh->threadstarted) {
1499 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1500 pthread_mutex_unlock(&mesh->mutex);
1504 // Reset node connection timers
1505 for splay_each(node_t, n, mesh->nodes) {
1506 n->last_connect_try = 0;
1510 //Check that a valid name is set
1512 logger(mesh, MESHLINK_ERROR, "No name given!\n");
1513 meshlink_errno = MESHLINK_EINVAL;
1514 pthread_mutex_unlock(&mesh->mutex);
1518 init_outgoings(mesh);
1520 // Start the main thread
1522 event_loop_start(&mesh->loop);
1524 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1525 pthread_attr_t attr;
1526 pthread_attr_init(&attr);
1527 pthread_attr_setstacksize(&attr, 1024 * 1024);
1529 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1530 logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno));
1531 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1532 meshlink_errno = MESHLINK_EINTERNAL;
1533 event_loop_stop(&mesh->loop);
1534 pthread_mutex_unlock(&mesh->mutex);
1538 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1539 mesh->threadstarted = true;
1541 pthread_mutex_unlock(&mesh->mutex);
1545 void meshlink_stop(meshlink_handle_t *mesh) {
1546 logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n");
1549 meshlink_errno = MESHLINK_EINVAL;
1553 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1557 // Shut down the main thread
1558 event_loop_stop(&mesh->loop);
1560 // TODO: send something to a local socket to kick the event loop
1562 if(mesh->threadstarted) {
1563 // Wait for the main thread to finish
1564 pthread_mutex_unlock(&mesh->mutex);
1566 if(pthread_join(mesh->thread, NULL) != 0) {
1570 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1574 mesh->threadstarted = false;
1577 // Close all metaconnections
1578 if(mesh->connections) {
1579 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1581 connection_t *c = node->data;
1583 terminate_connection(mesh, c, false);
1587 exit_outgoings(mesh);
1589 // Try to write out any changed node config files, ignore errors at this point.
1591 for splay_each(node_t, n, mesh->nodes) {
1592 if(n->status.dirty) {
1593 if(!node_write_config(mesh, n, false)) {
1600 pthread_mutex_unlock(&mesh->mutex);
1603 void meshlink_close(meshlink_handle_t *mesh) {
1604 logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n");
1607 meshlink_errno = MESHLINK_EINVAL;
1611 // stop can be called even if mesh has not been started
1612 meshlink_stop(mesh);
1614 // lock is not released after this
1615 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1619 // Close and free all resources used.
1621 close_network_connections(mesh);
1623 logger(mesh, MESHLINK_INFO, "Terminating");
1625 event_loop_exit(&mesh->loop);
1629 if(mesh->confbase) {
1635 if(mesh->netns != -1) {
1639 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1643 meshlink_queue_exit(&mesh->outpacketqueue);
1646 free(mesh->appname);
1647 free(mesh->confbase);
1648 free(mesh->config_key);
1649 free(mesh->external_address_url);
1651 ecdsa_free(mesh->private_key);
1653 main_config_unlock(mesh);
1655 pthread_mutex_unlock(&mesh->mutex);
1656 pthread_mutex_destroy(&mesh->mutex);
1658 memset(mesh, 0, sizeof(*mesh));
1663 bool meshlink_destroy_ex(const meshlink_open_params_t *params) {
1664 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n");
1667 meshlink_errno = MESHLINK_EINVAL;
1671 if(!params->confbase) {
1672 /* Ephemeral instances */
1676 /* Exit early if the confbase directory itself doesn't exist */
1677 if(access(params->confbase, F_OK) && errno == ENOENT) {
1681 /* Take the lock the same way meshlink_open() would. */
1682 FILE *lockfile = fopen(params->lock_filename, "w+");
1685 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno));
1686 meshlink_errno = MESHLINK_ESTORAGE;
1691 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1695 // TODO: use _locking()?
1698 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1699 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename);
1701 meshlink_errno = MESHLINK_EBUSY;
1707 if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) {
1708 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno));
1712 if(unlink(params->lock_filename)) {
1713 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno));
1715 meshlink_errno = MESHLINK_ESTORAGE;
1721 if(!sync_path(params->confbase)) {
1722 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno));
1723 meshlink_errno = MESHLINK_ESTORAGE;
1730 bool meshlink_destroy(const char *confbase) {
1731 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase);
1733 char lock_filename[PATH_MAX];
1734 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1736 meshlink_open_params_t params = {
1737 .confbase = (char *)confbase,
1738 .lock_filename = lock_filename,
1741 return meshlink_destroy_ex(¶ms);
1744 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1745 logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb);
1748 meshlink_errno = MESHLINK_EINVAL;
1752 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1756 mesh->receive_cb = cb;
1757 pthread_mutex_unlock(&mesh->mutex);
1760 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1761 logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb);
1764 meshlink_errno = MESHLINK_EINVAL;
1768 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1772 mesh->connection_try_cb = cb;
1773 pthread_mutex_unlock(&mesh->mutex);
1776 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1777 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb);
1780 meshlink_errno = MESHLINK_EINVAL;
1784 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1788 mesh->node_status_cb = cb;
1789 pthread_mutex_unlock(&mesh->mutex);
1792 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1793 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb);
1796 meshlink_errno = MESHLINK_EINVAL;
1800 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1804 mesh->node_pmtu_cb = cb;
1805 pthread_mutex_unlock(&mesh->mutex);
1808 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1809 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb);
1812 meshlink_errno = MESHLINK_EINVAL;
1816 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1820 mesh->node_duplicate_cb = cb;
1821 pthread_mutex_unlock(&mesh->mutex);
1824 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1825 logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb);
1828 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1833 mesh->log_level = cb ? level : 0;
1834 pthread_mutex_unlock(&mesh->mutex);
1837 global_log_level = cb ? level : 0;
1841 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1842 logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb);
1845 meshlink_errno = MESHLINK_EINVAL;
1849 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1853 mesh->error_cb = cb;
1854 pthread_mutex_unlock(&mesh->mutex);
1857 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
1858 meshlink_packethdr_t *hdr;
1860 if(len > MAXSIZE - sizeof(*hdr)) {
1861 meshlink_errno = MESHLINK_EINVAL;
1865 node_t *n = (node_t *)destination;
1867 if(n->status.blacklisted) {
1868 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1869 meshlink_errno = MESHLINK_EBLACKLISTED;
1873 // Prepare the packet
1874 packet->probe = false;
1875 packet->tcp = false;
1876 packet->len = len + sizeof(*hdr);
1878 hdr = (meshlink_packethdr_t *)packet->data;
1879 memset(hdr, 0, sizeof(*hdr));
1880 // leave the last byte as 0 to make sure strings are always
1881 // null-terminated if they are longer than the buffer
1882 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
1883 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
1885 memcpy(packet->data + sizeof(*hdr), data, len);
1890 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1892 assert(destination);
1896 // Prepare the packet
1897 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
1901 // Send it immediately
1902 route(mesh, mesh->self, mesh->packet);
1907 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1908 logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len);
1910 // Validate arguments
1911 if(!mesh || !destination) {
1912 meshlink_errno = MESHLINK_EINVAL;
1921 meshlink_errno = MESHLINK_EINVAL;
1925 // Prepare the packet
1926 vpn_packet_t *packet = malloc(sizeof(*packet));
1929 meshlink_errno = MESHLINK_ENOMEM;
1933 if(!prepare_packet(mesh, destination, data, len, packet)) {
1939 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1941 meshlink_errno = MESHLINK_ENOMEM;
1945 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
1947 // Notify event loop
1948 signal_trigger(&mesh->loop, &mesh->datafromapp);
1953 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1955 meshlink_handle_t *mesh = data;
1957 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
1959 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1960 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
1961 mesh->self->in_packets++;
1962 mesh->self->in_bytes += packet->len;
1963 route(mesh, mesh->self, packet);
1968 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1969 if(!mesh || !destination) {
1970 meshlink_errno = MESHLINK_EINVAL;
1974 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1978 node_t *n = (node_t *)destination;
1980 if(!n->status.reachable) {
1981 pthread_mutex_unlock(&mesh->mutex);
1984 } else if(n->mtuprobes > 30 && n->minmtu) {
1985 pthread_mutex_unlock(&mesh->mutex);
1988 pthread_mutex_unlock(&mesh->mutex);
1993 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1994 if(!mesh || !node) {
1995 meshlink_errno = MESHLINK_EINVAL;
1999 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2003 node_t *n = (node_t *)node;
2005 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2006 meshlink_errno = MESHLINK_EINTERNAL;
2007 pthread_mutex_unlock(&mesh->mutex);
2011 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2014 meshlink_errno = MESHLINK_EINTERNAL;
2017 pthread_mutex_unlock(&mesh->mutex);
2021 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2023 meshlink_errno = MESHLINK_EINVAL;
2027 return (meshlink_node_t *)mesh->self;
2030 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2031 if(!mesh || !name) {
2032 meshlink_errno = MESHLINK_EINVAL;
2038 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2042 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2043 pthread_mutex_unlock(&mesh->mutex);
2046 meshlink_errno = MESHLINK_ENOENT;
2049 return (meshlink_node_t *)n;
2052 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2053 if(!mesh || !name) {
2054 meshlink_errno = MESHLINK_EINVAL;
2058 meshlink_submesh_t *submesh = NULL;
2060 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2064 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2065 pthread_mutex_unlock(&mesh->mutex);
2068 meshlink_errno = MESHLINK_ENOENT;
2074 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2075 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2076 meshlink_errno = MESHLINK_EINVAL;
2080 meshlink_node_t **result;
2083 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2087 *nmemb = mesh->nodes->count;
2088 result = realloc(nodes, *nmemb * sizeof(*nodes));
2091 meshlink_node_t **p = result;
2093 for splay_each(node_t, n, mesh->nodes) {
2094 *p++ = (meshlink_node_t *)n;
2099 meshlink_errno = MESHLINK_ENOMEM;
2102 pthread_mutex_unlock(&mesh->mutex);
2107 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) {
2108 meshlink_node_t **result;
2110 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2116 for splay_each(node_t, n, mesh->nodes) {
2117 if(search_node(n, condition)) {
2124 pthread_mutex_unlock(&mesh->mutex);
2128 result = realloc(nodes, *nmemb * sizeof(*nodes));
2131 meshlink_node_t **p = result;
2133 for splay_each(node_t, n, mesh->nodes) {
2134 if(search_node(n, condition)) {
2135 *p++ = (meshlink_node_t *)n;
2141 meshlink_errno = MESHLINK_ENOMEM;
2144 pthread_mutex_unlock(&mesh->mutex);
2149 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2150 dev_class_t *devclass = (dev_class_t *)condition;
2152 if(*devclass == (dev_class_t)node->devclass) {
2159 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2160 if(condition == node->submesh) {
2172 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) {
2173 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2174 meshlink_errno = MESHLINK_EINVAL;
2178 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2181 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2182 if(!mesh || !submesh || !nmemb) {
2183 meshlink_errno = MESHLINK_EINVAL;
2187 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2190 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2191 if(!mesh || !node) {
2192 meshlink_errno = MESHLINK_EINVAL;
2196 dev_class_t devclass;
2198 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2202 devclass = ((node_t *)node)->devclass;
2204 pthread_mutex_unlock(&mesh->mutex);
2209 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2210 if(!mesh || !node) {
2211 meshlink_errno = MESHLINK_EINVAL;
2215 node_t *n = (node_t *)node;
2217 meshlink_submesh_t *s;
2219 s = (meshlink_submesh_t *)n->submesh;
2224 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2225 if(!mesh || !node) {
2226 meshlink_errno = MESHLINK_EINVAL;
2230 node_t *n = (node_t *)node;
2233 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2237 reachable = n->status.reachable && !n->status.blacklisted;
2239 // TODO: handle reachable times?
2240 (void)last_reachable;
2241 (void)last_unreachable;
2243 pthread_mutex_unlock(&mesh->mutex);
2248 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2249 logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen);
2251 if(!mesh || !data || !len || !signature || !siglen) {
2252 meshlink_errno = MESHLINK_EINVAL;
2256 if(*siglen < MESHLINK_SIGLEN) {
2257 meshlink_errno = MESHLINK_EINVAL;
2261 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2265 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2266 meshlink_errno = MESHLINK_EINTERNAL;
2267 pthread_mutex_unlock(&mesh->mutex);
2271 *siglen = MESHLINK_SIGLEN;
2272 pthread_mutex_unlock(&mesh->mutex);
2276 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2277 logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen);
2279 if(!mesh || !source || !data || !len || !signature) {
2280 meshlink_errno = MESHLINK_EINVAL;
2284 if(siglen != MESHLINK_SIGLEN) {
2285 meshlink_errno = MESHLINK_EINVAL;
2289 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2295 struct node_t *n = (struct node_t *)source;
2297 if(!node_read_public_key(mesh, n)) {
2298 meshlink_errno = MESHLINK_EINTERNAL;
2301 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2304 pthread_mutex_unlock(&mesh->mutex);
2308 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2309 logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)");
2311 if(!mesh || !node || !address) {
2312 meshlink_errno = MESHLINK_EINVAL;
2316 if(!is_valid_hostname(address)) {
2317 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address);
2318 meshlink_errno = MESHLINK_EINVAL;
2322 if((node_t *)node != mesh->self && !port) {
2323 logger(mesh, MESHLINK_ERROR, "Missing port number!");
2324 meshlink_errno = MESHLINK_EINVAL;
2329 if(port && !is_valid_port(port)) {
2330 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address);
2331 meshlink_errno = MESHLINK_EINVAL;
2335 char *canonical_address;
2337 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2339 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2343 node_t *n = (node_t *)node;
2344 free(n->canonical_address);
2345 n->canonical_address = canonical_address;
2347 if(!node_write_config(mesh, n, false)) {
2348 pthread_mutex_unlock(&mesh->mutex);
2352 pthread_mutex_unlock(&mesh->mutex);
2354 return config_sync(mesh, "current");
2357 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2358 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)");
2360 if(!mesh || !node) {
2361 meshlink_errno = MESHLINK_EINVAL;
2365 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2369 node_t *n = (node_t *)node;
2370 free(n->canonical_address);
2371 n->canonical_address = NULL;
2373 if(!node_write_config(mesh, n, false)) {
2374 pthread_mutex_unlock(&mesh->mutex);
2378 pthread_mutex_unlock(&mesh->mutex);
2380 return config_sync(mesh, "current");
2383 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2384 logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)");
2386 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2389 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2390 logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()");
2393 meshlink_errno = MESHLINK_EINVAL;
2397 char *address = meshlink_get_external_address(mesh);
2403 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2409 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2410 logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)");
2412 if(!mesh || !invitation) {
2413 meshlink_errno = MESHLINK_EINVAL;
2417 if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) {
2418 meshlink_errno = MESHLINK_EINVAL;
2422 join_state_t state = {
2427 ecdsa_t *key = NULL;
2428 ecdsa_t *hiskey = NULL;
2430 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2431 char copy[strlen(invitation) + 1];
2433 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2437 //Before doing meshlink_join make sure we are not connected to another mesh
2438 if(mesh->threadstarted) {
2439 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2440 meshlink_errno = MESHLINK_EINVAL;
2444 // 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.
2445 if(mesh->nodes->count > 1) {
2446 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2447 meshlink_errno = MESHLINK_EINVAL;
2451 strcpy(copy, invitation);
2453 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2455 char *slash = strchr(copy, '/');
2463 if(strlen(slash) != 48) {
2467 char *address = copy;
2470 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2474 if(mesh->inviter_commits_first) {
2475 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2478 // Generate a throw-away key for the invitation.
2479 key = ecdsa_generate();
2482 meshlink_errno = MESHLINK_EINTERNAL;
2486 char *b64key = ecdsa_get_base64_public_key(key);
2489 while(address && *address) {
2490 // We allow commas in the address part to support multiple addresses in one invitation URL.
2491 comma = strchr(address, ',');
2497 // Split of the port
2498 port = strrchr(address, ':');
2506 // IPv6 address are enclosed in brackets, per RFC 3986
2507 if(*address == '[') {
2509 char *bracket = strchr(address, ']');
2522 // Connect to the meshlink daemon mentioned in the URL.
2523 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2526 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2527 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
2529 if(state.sock == -1) {
2530 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2531 meshlink_errno = MESHLINK_ENETWORK;
2537 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
2540 set_timeout(state.sock, 5000);
2542 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2543 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2544 meshlink_errno = MESHLINK_ENETWORK;
2545 closesocket(state.sock);
2555 meshlink_errno = MESHLINK_ERESOLV;
2558 if(state.sock != -1 || !comma) {
2565 if(state.sock == -1) {
2569 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2571 // Tell him we have an invitation, and give him our throw-away key.
2575 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2576 logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2577 meshlink_errno = MESHLINK_ENETWORK;
2583 char hisname[4096] = "";
2584 int code, hismajor, hisminor = 0;
2586 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) {
2587 logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n");
2588 meshlink_errno = MESHLINK_ENETWORK;
2592 // Check if the hash of the key he gave us matches the hash in the URL.
2593 char *fingerprint = state.line + 2;
2596 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2597 logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2);
2598 meshlink_errno = MESHLINK_EINTERNAL;
2602 if(memcmp(hishash, state.hash, 18)) {
2603 logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2);
2604 meshlink_errno = MESHLINK_EPEER;
2608 hiskey = ecdsa_set_base64_public_key(fingerprint);
2611 meshlink_errno = MESHLINK_EINTERNAL;
2615 // Start an SPTPS session
2616 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2617 meshlink_errno = MESHLINK_EINTERNAL;
2621 // Feed rest of input buffer to SPTPS
2622 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2623 meshlink_errno = MESHLINK_EPEER;
2628 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2630 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2632 if(errno == EINTR) {
2636 logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2637 meshlink_errno = MESHLINK_ENETWORK;
2641 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2642 meshlink_errno = MESHLINK_EPEER;
2647 if(!state.success) {
2648 logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n");
2649 meshlink_errno = MESHLINK_EPEER;
2653 sptps_stop(&state.sptps);
2656 closesocket(state.sock);
2658 pthread_mutex_unlock(&mesh->mutex);
2662 logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n");
2663 meshlink_errno = MESHLINK_EINVAL;
2665 sptps_stop(&state.sptps);
2669 if(state.sock != -1) {
2670 closesocket(state.sock);
2673 pthread_mutex_unlock(&mesh->mutex);
2677 char *meshlink_export(meshlink_handle_t *mesh) {
2679 meshlink_errno = MESHLINK_EINVAL;
2683 // Create a config file on the fly.
2686 packmsg_output_t out = {buf, sizeof(buf)};
2687 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2688 packmsg_add_str(&out, mesh->name);
2689 packmsg_add_str(&out, CORE_MESH);
2691 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2695 packmsg_add_int32(&out, mesh->self->devclass);
2696 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2697 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2699 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
2700 char *canonical_address = NULL;
2701 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
2702 packmsg_add_str(&out, canonical_address);
2703 free(canonical_address);
2705 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2710 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2711 if(mesh->self->recent[i].sa.sa_family) {
2718 packmsg_add_array(&out, count);
2720 for(uint32_t i = 0; i < count; i++) {
2721 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2724 packmsg_add_int64(&out, 0);
2725 packmsg_add_int64(&out, 0);
2727 pthread_mutex_unlock(&mesh->mutex);
2729 if(!packmsg_output_ok(&out)) {
2730 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2731 meshlink_errno = MESHLINK_EINTERNAL;
2735 // Prepare a base64-encoded packmsg array containing our config file
2737 uint32_t len = packmsg_output_size(&out, buf);
2738 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2739 uint8_t *buf2 = xmalloc(len2);
2740 packmsg_output_t out2 = {buf2, len2};
2741 packmsg_add_array(&out2, 1);
2742 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2744 if(!packmsg_output_ok(&out2)) {
2745 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2746 meshlink_errno = MESHLINK_EINTERNAL;
2751 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2753 return (char *)buf2;
2756 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2757 logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data);
2759 if(!mesh || !data) {
2760 meshlink_errno = MESHLINK_EINVAL;
2764 size_t datalen = strlen(data);
2765 uint8_t *buf = xmalloc(datalen);
2766 int buflen = b64decode(data, buf, datalen);
2769 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2771 meshlink_errno = MESHLINK_EPEER;
2775 packmsg_input_t in = {buf, buflen};
2776 uint32_t count = packmsg_get_array(&in);
2779 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2781 meshlink_errno = MESHLINK_EPEER;
2785 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2791 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
2797 packmsg_input_t in2 = {data2, len2};
2798 uint32_t version = packmsg_get_uint32(&in2);
2799 char *name = packmsg_get_str_dup(&in2);
2801 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2803 packmsg_input_invalidate(&in);
2807 if(!check_id(name)) {
2812 node_t *n = lookup_node(mesh, name);
2815 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2823 config_t config = {data2, len2};
2825 if(!node_read_from_config(mesh, n, &config)) {
2827 packmsg_input_invalidate(&in);
2831 if(!node_write_config(mesh, n, true)) {
2840 pthread_mutex_unlock(&mesh->mutex);
2844 if(!packmsg_done(&in)) {
2845 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2846 meshlink_errno = MESHLINK_EPEER;
2850 if(!config_sync(mesh, "current")) {
2857 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
2858 logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)");
2860 if(!mesh || !node) {
2861 meshlink_errno = MESHLINK_EINVAL;
2865 node_t *n = (node_t *)node;
2867 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2871 /* Check that the node is not reachable */
2872 if(n->status.reachable || n->connection) {
2873 pthread_mutex_unlock(&mesh->mutex);
2874 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
2878 /* Check that we don't have any active UTCP connections */
2879 if(n->utcp && utcp_is_active(n->utcp)) {
2880 pthread_mutex_unlock(&mesh->mutex);
2881 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
2885 /* Check that we have no active connections to this node */
2886 for list_each(connection_t, c, mesh->connections) {
2888 pthread_mutex_unlock(&mesh->mutex);
2889 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
2894 /* Remove any pending outgoings to this node */
2895 if(mesh->outgoings) {
2896 for list_each(outgoing_t, outgoing, mesh->outgoings) {
2897 if(outgoing->node == n) {
2898 list_delete_node(mesh->outgoings, list_node);
2903 /* Delete the config file for this node */
2904 if(!config_delete(mesh, "current", n->name)) {
2905 pthread_mutex_unlock(&mesh->mutex);
2909 /* Delete the node struct and any remaining edges referencing this node */
2912 pthread_mutex_unlock(&mesh->mutex);
2914 return config_sync(mesh, "current");
2917 /* Hint that a hostname may be found at an address
2918 * See header file for detailed comment.
2920 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2921 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr);
2923 if(!mesh || !node || !addr) {
2924 meshlink_errno = EINVAL;
2928 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2932 node_t *n = (node_t *)node;
2934 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
2935 if(!node_write_config(mesh, n, false)) {
2936 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
2940 pthread_mutex_unlock(&mesh->mutex);
2941 // @TODO do we want to fire off a connection attempt right away?
2944 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2946 node_t *n = utcp->priv;
2947 meshlink_handle_t *mesh = n->mesh;
2949 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
2950 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
2952 return mesh->channel_accept_cb;
2956 /* Finish one AIO buffer, return true if the channel is still open. */
2957 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
2958 meshlink_aio_buffer_t *aio = *head;
2962 channel->in_callback = true;
2965 if(aio->cb.buffer) {
2966 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
2970 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
2974 channel->in_callback = false;
2987 /* Finish all AIO buffers, return true if the channel is still open. */
2988 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
2990 if(!aio_finish_one(mesh, channel, head)) {
2998 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2999 meshlink_channel_t *channel = connection->priv;
3005 node_t *n = channel->node;
3006 meshlink_handle_t *mesh = n->mesh;
3008 if(n->status.destroyed) {
3009 meshlink_channel_close(mesh, channel);
3013 const char *p = data;
3016 while(channel->aio_receive) {
3018 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3019 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3026 meshlink_aio_buffer_t *aio = channel->aio_receive;
3027 size_t todo = aio->len - aio->done;
3034 memcpy((char *)aio->data + aio->done, p, todo);
3036 ssize_t result = write(aio->fd, p, todo);
3039 if(result < 0 && errno == EINTR) {
3043 /* Writing to fd failed, cancel just this AIO buffer. */
3044 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3046 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3060 if(aio->done == aio->len) {
3061 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3071 if(channel->receive_cb) {
3072 channel->receive_cb(mesh, channel, p, left);
3078 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3079 node_t *n = utcp_connection->utcp->priv;
3085 meshlink_handle_t *mesh = n->mesh;
3087 if(!mesh->channel_accept_cb) {
3091 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3093 channel->c = utcp_connection;
3095 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3096 utcp_accept(utcp_connection, channel_recv, channel);
3102 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3103 node_t *n = utcp_connection->utcp->priv;
3104 meshlink_handle_t *mesh = n->mesh;
3106 if(n->mtuprobes == 31 && n->mtutimeout.cb) {
3107 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3113 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3114 node_t *n = utcp->priv;
3116 if(n->status.destroyed) {
3120 meshlink_handle_t *mesh = n->mesh;
3121 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3124 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3125 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3127 if(!mesh || !channel) {
3128 meshlink_errno = MESHLINK_EINVAL;
3132 channel->receive_cb = cb;
3135 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3137 node_t *n = (node_t *)source;
3143 utcp_recv(n->utcp, data, len);
3146 static void channel_poll(struct utcp_connection *connection, size_t len) {
3147 meshlink_channel_t *channel = connection->priv;
3153 node_t *n = channel->node;
3154 meshlink_handle_t *mesh = n->mesh;
3156 while(channel->aio_send) {
3158 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3159 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3166 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3167 meshlink_aio_buffer_t *aio = channel->aio_send;
3168 size_t todo = aio->len - aio->done;
3176 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3178 /* Limit the amount we read at once to avoid stack overflows */
3184 ssize_t result = read(aio->fd, buf, todo);
3188 sent = utcp_send(connection, buf, todo);
3190 if(result < 0 && errno == EINTR) {
3194 /* Reading from fd failed, cancel just this AIO buffer. */
3196 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3199 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3207 if(sent != (ssize_t)todo) {
3208 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3209 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3220 /* If we didn't finish this buffer, exit early. */
3221 if(aio->done < aio->len) {
3225 /* Signal completion of this buffer, and go to the next one. */
3226 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3235 if(channel->poll_cb) {
3236 channel->poll_cb(mesh, channel, len);
3238 utcp_set_poll_cb(connection, NULL);
3242 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3243 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3245 if(!mesh || !channel) {
3246 meshlink_errno = MESHLINK_EINVAL;
3250 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3254 channel->poll_cb = cb;
3255 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3256 pthread_mutex_unlock(&mesh->mutex);
3259 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
3260 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb);
3263 meshlink_errno = MESHLINK_EINVAL;
3267 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3271 mesh->channel_listen_cb = cb;
3273 pthread_mutex_unlock(&mesh->mutex);
3276 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3277 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb);
3280 meshlink_errno = MESHLINK_EINVAL;
3284 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3288 mesh->channel_accept_cb = cb;
3289 mesh->receive_cb = channel_receive;
3291 for splay_each(node_t, n, mesh->nodes) {
3292 if(!n->utcp && n != mesh->self) {
3293 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3294 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3295 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3299 pthread_mutex_unlock(&mesh->mutex);
3302 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3303 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
3305 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
3308 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3309 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
3311 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
3314 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3315 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3317 if(!mesh || !channel) {
3318 meshlink_errno = MESHLINK_EINVAL;
3322 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3326 utcp_set_sndbuf(channel->c, buf, size);
3327 pthread_mutex_unlock(&mesh->mutex);
3330 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3331 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3333 if(!mesh || !channel) {
3334 meshlink_errno = MESHLINK_EINVAL;
3338 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3342 utcp_set_rcvbuf(channel->c, buf, size);
3343 pthread_mutex_unlock(&mesh->mutex);
3346 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
3347 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
3349 if(!mesh || !channel) {
3350 meshlink_errno = MESHLINK_EINVAL;
3354 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3358 utcp_set_flags(channel->c, flags);
3359 pthread_mutex_unlock(&mesh->mutex);
3362 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) {
3363 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu, %u)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len, flags);
3366 abort(); // TODO: handle non-NULL data
3369 if(!mesh || !node) {
3370 meshlink_errno = MESHLINK_EINVAL;
3374 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3378 node_t *n = (node_t *)node;
3381 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3382 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3383 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3384 mesh->receive_cb = channel_receive;
3387 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3388 pthread_mutex_unlock(&mesh->mutex);
3393 if(n->status.blacklisted) {
3394 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3395 meshlink_errno = MESHLINK_EBLACKLISTED;
3396 pthread_mutex_unlock(&mesh->mutex);
3400 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3402 channel->receive_cb = cb;
3405 channel->priv = (void *)data;
3408 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3410 pthread_mutex_unlock(&mesh->mutex);
3413 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3421 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) {
3422 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len);
3424 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3427 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3428 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction);
3430 if(!mesh || !channel) {
3431 meshlink_errno = MESHLINK_EINVAL;
3435 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3439 utcp_shutdown(channel->c, direction);
3440 pthread_mutex_unlock(&mesh->mutex);
3443 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3444 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel);
3446 if(!mesh || !channel) {
3447 meshlink_errno = MESHLINK_EINVAL;
3451 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3456 utcp_close(channel->c);
3459 /* Clean up any outstanding AIO buffers. */
3460 aio_abort(mesh, channel, &channel->aio_send);
3461 aio_abort(mesh, channel, &channel->aio_receive);
3464 if(!channel->in_callback) {
3468 pthread_mutex_unlock(&mesh->mutex);
3471 void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3472 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel);
3474 if(!mesh || !channel) {
3475 meshlink_errno = MESHLINK_EINVAL;
3479 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3484 utcp_abort(channel->c);
3487 /* Clean up any outstanding AIO buffers. */
3488 aio_abort(mesh, channel, &channel->aio_send);
3489 aio_abort(mesh, channel, &channel->aio_receive);
3492 if(!channel->in_callback) {
3496 pthread_mutex_unlock(&mesh->mutex);
3499 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3500 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len);
3502 if(!mesh || !channel) {
3503 meshlink_errno = MESHLINK_EINVAL;
3512 meshlink_errno = MESHLINK_EINVAL;
3516 // TODO: more finegrained locking.
3517 // Ideally we want to put the data into the UTCP connection's send buffer.
3518 // Then, preferably only if there is room in the receiver window,
3519 // kick the meshlink thread to go send packets.
3523 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3527 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3528 if(channel->aio_send) {
3531 retval = utcp_send(channel->c, data, len);
3534 pthread_mutex_unlock(&mesh->mutex);
3537 meshlink_errno = MESHLINK_ENETWORK;
3543 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) {
3544 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3546 if(!mesh || !channel) {
3547 meshlink_errno = MESHLINK_EINVAL;
3552 meshlink_errno = MESHLINK_EINVAL;
3556 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3559 aio->cb.buffer = cb;
3562 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3566 /* Append the AIO buffer descriptor to the end of the chain */
3567 meshlink_aio_buffer_t **p = &channel->aio_send;
3575 /* Ensure the poll callback is set, and call it right now to push data if possible */
3576 utcp_set_poll_cb(channel->c, channel_poll);
3577 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
3580 channel_poll(channel->c, todo);
3583 pthread_mutex_unlock(&mesh->mutex);
3588 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) {
3589 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3591 if(!mesh || !channel) {
3592 meshlink_errno = MESHLINK_EINVAL;
3596 if(!len || fd == -1) {
3597 meshlink_errno = MESHLINK_EINVAL;
3601 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3607 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3611 /* Append the AIO buffer descriptor to the end of the chain */
3612 meshlink_aio_buffer_t **p = &channel->aio_send;
3620 /* Ensure the poll callback is set, and call it right now to push data if possible */
3621 utcp_set_poll_cb(channel->c, channel_poll);
3622 size_t left = utcp_get_rcvbuf_free(channel->c);
3625 channel_poll(channel->c, left);
3628 pthread_mutex_unlock(&mesh->mutex);
3633 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) {
3634 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3636 if(!mesh || !channel) {
3637 meshlink_errno = MESHLINK_EINVAL;
3642 meshlink_errno = MESHLINK_EINVAL;
3646 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3649 aio->cb.buffer = cb;
3652 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3656 /* Append the AIO buffer descriptor to the end of the chain */
3657 meshlink_aio_buffer_t **p = &channel->aio_receive;
3665 pthread_mutex_unlock(&mesh->mutex);
3670 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) {
3671 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3673 if(!mesh || !channel) {
3674 meshlink_errno = MESHLINK_EINVAL;
3678 if(!len || fd == -1) {
3679 meshlink_errno = MESHLINK_EINVAL;
3683 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3689 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3693 /* Append the AIO buffer descriptor to the end of the chain */
3694 meshlink_aio_buffer_t **p = &channel->aio_receive;
3702 pthread_mutex_unlock(&mesh->mutex);
3707 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3708 if(!mesh || !channel) {
3709 meshlink_errno = MESHLINK_EINVAL;
3713 return channel->c->flags;
3716 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3717 if(!mesh || !channel) {
3718 meshlink_errno = MESHLINK_EINVAL;
3722 return utcp_get_sendq(channel->c);
3725 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3726 if(!mesh || !channel) {
3727 meshlink_errno = MESHLINK_EINVAL;
3731 return utcp_get_recvq(channel->c);
3734 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3735 if(!mesh || !channel) {
3736 meshlink_errno = MESHLINK_EINVAL;
3740 return utcp_get_mss(channel->node->utcp);
3743 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3744 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout);
3746 if(!mesh || !node) {
3747 meshlink_errno = MESHLINK_EINVAL;
3751 node_t *n = (node_t *)node;
3753 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3758 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3759 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3760 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3763 utcp_set_user_timeout(n->utcp, timeout);
3765 pthread_mutex_unlock(&mesh->mutex);
3768 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3769 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3770 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3771 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3772 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3775 if(mesh->node_status_cb) {
3776 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3779 if(mesh->node_pmtu_cb) {
3780 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3784 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3785 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
3787 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3788 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3792 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3793 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3797 n->status.duplicate = true;
3798 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3801 void meshlink_hint_network_change(struct meshlink_handle *mesh) {
3802 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()");
3805 meshlink_errno = MESHLINK_EINVAL;
3809 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3813 pthread_mutex_unlock(&mesh->mutex);
3816 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3817 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout);
3819 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3820 meshlink_errno = EINVAL;
3824 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3825 meshlink_errno = EINVAL;
3829 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3833 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3834 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3835 pthread_mutex_unlock(&mesh->mutex);
3838 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3839 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period);
3841 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3842 meshlink_errno = EINVAL;
3846 if(fast_retry_period < 0) {
3847 meshlink_errno = EINVAL;
3851 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3855 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
3856 pthread_mutex_unlock(&mesh->mutex);
3859 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
3860 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout);
3862 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3863 meshlink_errno = EINVAL;
3867 if(maxtimeout < 0) {
3868 meshlink_errno = EINVAL;
3872 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3876 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
3877 pthread_mutex_unlock(&mesh->mutex);
3880 void meshlink_reset_timers(struct meshlink_handle *mesh) {
3881 logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()");
3887 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3891 handle_network_change(mesh, true);
3893 pthread_mutex_unlock(&mesh->mutex);
3896 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
3897 logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first);
3900 meshlink_errno = EINVAL;
3904 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3908 mesh->inviter_commits_first = inviter_commits_first;
3909 pthread_mutex_unlock(&mesh->mutex);
3912 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
3913 logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity);
3915 if(!mesh || granularity < 0) {
3916 meshlink_errno = EINVAL;
3920 utcp_set_clock_granularity(granularity);
3923 void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) {
3924 logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy);
3927 meshlink_errno = EINVAL;
3931 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3935 mesh->storage_policy = policy;
3936 pthread_mutex_unlock(&mesh->mutex);
3939 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3942 if(!mesh->connections || !mesh->loop.running) {
3947 signal_trigger(&mesh->loop, &mesh->datafromapp);
3950 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
3951 // We should only call the callback function if we are in the background thread.
3952 if(!mesh->error_cb) {
3956 if(!mesh->threadstarted) {
3960 if(mesh->thread == pthread_self()) {
3961 mesh->error_cb(mesh, cb_errno);
3965 static void __attribute__((constructor)) meshlink_init(void) {
3967 utcp_set_clock_granularity(10000);
3970 static void __attribute__((destructor)) meshlink_exit(void) {