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.
27 #include "meshlink_internal.h"
39 #include "ed25519/sha512.h"
43 #define MSG_NOSIGNAL 0
45 __thread meshlink_errno_t meshlink_errno;
46 meshlink_log_cb_t global_log_cb;
47 meshlink_log_level_t global_log_level;
49 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
51 static int rstrip(char *value) {
52 int len = strlen(value);
54 while(len && strchr("\t\r\n ", value[len - 1])) {
61 static bool is_valid_hostname(const char *hostname) {
66 for(const char *p = hostname; *p; p++) {
67 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
75 static bool is_valid_port(const char *port) {
82 unsigned long int result = strtoul(port, &end, 10);
83 return result && result < 65536 && !*end;
86 for(const char *p = port; *p; p++) {
87 if(!(isalnum(*p) || *p == '-')) {
95 static void set_timeout(int sock, int timeout) {
100 tv.tv_sec = timeout / 1000;
101 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
103 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
104 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
107 struct socket_in_netns_params {
116 static void *socket_in_netns_thread(void *arg) {
117 struct socket_in_netns_params *params = arg;
119 if(setns(params->netns, CLONE_NEWNET) == -1) {
120 meshlink_errno = MESHLINK_EINVAL;
124 params->fd = socket(params->domain, params->type, params->protocol);
130 static int socket_in_netns(int domain, int type, int protocol, int netns) {
132 return socket(domain, type, protocol);
136 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
140 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
141 if(pthread_join(thr, NULL) != 0) {
153 // Find out what local address a socket would use if we connect to the given address.
154 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
155 // of both endpoints, but this will actually not send any UDP packet.
156 static bool getlocaladdr(const char *destaddr, sockaddr_t *sa, socklen_t *salen, int netns) {
157 struct addrinfo *rai = NULL;
158 const struct addrinfo hint = {
159 .ai_family = AF_UNSPEC,
160 .ai_socktype = SOCK_DGRAM,
161 .ai_protocol = IPPROTO_UDP,
162 .ai_flags = AI_NUMERICHOST | AI_NUMERICSERV,
165 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
169 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
176 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
184 if(getsockname(sock, &sa->sa, salen)) {
193 static bool getlocaladdrname(const char *destaddr, char *host, socklen_t hostlen, int netns) {
195 socklen_t salen = sizeof(sa);
197 if(!getlocaladdr(destaddr, &sa, &salen, netns)) {
201 if(getnameinfo(&sa.sa, salen, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
208 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
209 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
212 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
213 logger(mesh, MESHLINK_DEBUG, "meshlink_get_external_address_for_family(%d)", family);
214 const char *url = mesh->external_address_url;
217 url = "http://meshlink.io/host.cgi";
220 /* Find the hostname part between the slashes */
221 if(strncmp(url, "http://", 7)) {
223 meshlink_errno = MESHLINK_EINTERNAL;
227 const char *begin = url + 7;
229 const char *end = strchr(begin, '/');
232 end = begin + strlen(begin);
236 char host[end - begin + 1];
237 strncpy(host, begin, end - begin);
238 host[end - begin] = 0;
240 char *port = strchr(host, ':');
246 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
247 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(host), xstrdup(port ? port : "80"), SOCK_STREAM, 5);
249 char *hostname = NULL;
251 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
252 if(family != AF_UNSPEC && aip->ai_family != family) {
256 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
260 setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
264 set_timeout(s, 5000);
266 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
273 send(s, "GET ", 4, 0);
274 send(s, url, strlen(url), 0);
275 send(s, " HTTP/1.0\r\n\r\n", 13, 0);
276 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
281 if(line[len - 1] == '\n') {
285 char *p = strrchr(line, '\n');
288 hostname = xstrdup(p + 1);
304 // Check that the hostname is reasonable
305 if(hostname && !is_valid_hostname(hostname)) {
311 meshlink_errno = MESHLINK_ERESOLV;
317 static bool is_localaddr(sockaddr_t *sa) {
318 switch(sa->sa.sa_family) {
320 return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
323 uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
324 return first == 0 || (first & 0xffc0) == 0xfe80;
332 #ifdef HAVE_GETIFADDRS
333 struct getifaddrs_in_netns_params {
334 struct ifaddrs **ifa;
339 static void *getifaddrs_in_netns_thread(void *arg) {
340 struct getifaddrs_in_netns_params *params = arg;
342 if(setns(params->netns, CLONE_NEWNET) == -1) {
343 meshlink_errno = MESHLINK_EINVAL;
347 if(getifaddrs(params->ifa) != 0) {
355 static int getifaddrs_in_netns(struct ifaddrs **ifa, int netns) {
357 return getifaddrs(ifa);
361 struct getifaddrs_in_netns_params params = {ifa, netns};
364 if(pthread_create(&thr, NULL, getifaddrs_in_netns_thread, ¶ms) == 0) {
365 if(pthread_join(thr, NULL) != 0) {
370 return *params.ifa ? 0 : -1;
378 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
379 logger(mesh, MESHLINK_DEBUG, "meshlink_get_local_address_for_family(%d)", family);
382 meshlink_errno = MESHLINK_EINVAL;
386 // Determine address of the local interface used for outgoing connections.
387 char localaddr[NI_MAXHOST];
388 bool success = false;
390 if(family == AF_INET) {
391 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
392 } else if(family == AF_INET6) {
393 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
396 #ifdef HAVE_GETIFADDRS
399 struct ifaddrs *ifa = NULL;
400 getifaddrs_in_netns(&ifa, mesh->netns);
402 for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
403 sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
405 if(!sa || sa->sa.sa_family != family) {
409 if(is_localaddr(sa)) {
413 if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
425 meshlink_errno = MESHLINK_ENETWORK;
429 return xstrdup(localaddr);
432 static bool try_bind(meshlink_handle_t *mesh, int port) {
433 struct addrinfo *ai = NULL;
434 struct addrinfo hint = {
435 .ai_flags = AI_PASSIVE,
436 .ai_family = AF_UNSPEC,
437 .ai_socktype = SOCK_STREAM,
438 .ai_protocol = IPPROTO_TCP,
442 snprintf(portstr, sizeof(portstr), "%d", port);
444 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
448 bool success = false;
450 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
451 /* Try to bind to TCP. */
453 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
456 if(errno == EADDRINUSE) {
457 /* If this port is in use for any address family, avoid it. */
473 int check_port(meshlink_handle_t *mesh) {
474 for(int i = 0; i < 1000; i++) {
475 int port = 0x1000 + prng(mesh, 0x8000);
477 if(try_bind(mesh, port)) {
479 xasprintf(&mesh->myport, "%d", port);
484 meshlink_errno = MESHLINK_ENETWORK;
485 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
489 static bool write_main_config_files(meshlink_handle_t *mesh) {
490 if(!mesh->confbase) {
496 /* Write the main config file */
497 packmsg_output_t out = {buf, sizeof buf};
499 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
500 packmsg_add_str(&out, mesh->name);
501 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
502 packmsg_add_nil(&out); // Invitation keys are not supported
503 packmsg_add_uint16(&out, atoi(mesh->myport));
505 if(!packmsg_output_ok(&out)) {
509 config_t config = {buf, packmsg_output_size(&out, buf)};
511 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
515 /* Write our own host config file */
516 if(!node_write_config(mesh, mesh->self, true)) {
524 meshlink_handle_t *mesh;
526 char cookie[18 + 32];
537 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
538 meshlink_handle_t *mesh = state->mesh;
539 packmsg_input_t in = {buf, len};
540 uint32_t version = packmsg_get_uint32(&in);
542 if(version != MESHLINK_INVITATION_VERSION) {
543 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
547 char *name = packmsg_get_str_dup(&in);
548 char *submesh_name = packmsg_get_str_dup(&in);
549 dev_class_t devclass = packmsg_get_int32(&in);
550 uint32_t count = packmsg_get_array(&in);
552 if(!name || !check_id(name)) {
553 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
559 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
560 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
567 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
574 free(mesh->self->name);
576 mesh->self->name = xstrdup(name);
577 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
579 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
581 // Initialize configuration directory
582 if(!config_init(mesh, "current")) {
586 if(!write_main_config_files(mesh)) {
590 // Write host config files
591 for(uint32_t i = 0; i < count; i++) {
593 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
596 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
600 packmsg_input_t in2 = {data, data_len};
601 uint32_t version2 = packmsg_get_uint32(&in2);
602 char *name2 = packmsg_get_str_dup(&in2);
604 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
606 packmsg_input_invalidate(&in);
610 if(!check_id(name2)) {
615 if(!strcmp(name2, mesh->name)) {
616 logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n");
618 meshlink_errno = MESHLINK_EPEER;
622 node_t *n = new_node();
625 config_t config = {data, data_len};
627 if(!node_read_from_config(mesh, n, &config)) {
629 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
630 meshlink_errno = MESHLINK_EPEER;
635 /* The first host config file is of the inviter itself;
636 * remember the address we are currently using for the invitation connection.
639 socklen_t salen = sizeof(sa);
641 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
642 node_add_recent_address(mesh, n, &sa);
646 if(!node_write_config(mesh, n, true)) {
654 /* Ensure the configuration directory metadata is on disk */
655 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
659 if(!mesh->inviter_commits_first) {
660 devtool_set_inviter_commits_first(false);
663 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
665 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
670 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
672 join_state_t *state = handle;
673 const char *ptr = data;
676 int result = send(state->sock, ptr, len, 0);
678 if(result == -1 && errno == EINTR) {
680 } else if(result <= 0) {
691 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
692 join_state_t *state = handle;
693 meshlink_handle_t *mesh = state->mesh;
695 if(mesh->inviter_commits_first) {
697 case SPTPS_HANDSHAKE:
698 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
704 if(!finalize_join(state, msg, len)) {
708 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
709 shutdown(state->sock, SHUT_RDWR);
710 state->success = true;
718 case SPTPS_HANDSHAKE:
719 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
722 return finalize_join(state, msg, len);
725 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
726 shutdown(state->sock, SHUT_RDWR);
727 state->success = true;
738 static bool recvline(join_state_t *state) {
739 char *newline = NULL;
741 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
742 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
744 if(result == -1 && errno == EINTR) {
746 } else if(result <= 0) {
750 state->blen += result;
753 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
757 size_t len = newline - state->buffer;
759 memcpy(state->line, state->buffer, len);
760 state->line[len] = 0;
761 memmove(state->buffer, newline + 1, state->blen - len - 1);
762 state->blen -= len + 1;
767 static bool sendline(int fd, const char *format, ...) {
773 va_start(ap, format);
774 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
777 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
785 int result = send(fd, p, blen, MSG_NOSIGNAL);
787 if(result == -1 && errno == EINTR) {
789 } else if(result <= 0) {
800 static const char *errstr[] = {
801 [MESHLINK_OK] = "No error",
802 [MESHLINK_EINVAL] = "Invalid argument",
803 [MESHLINK_ENOMEM] = "Out of memory",
804 [MESHLINK_ENOENT] = "No such node",
805 [MESHLINK_EEXIST] = "Node already exists",
806 [MESHLINK_EINTERNAL] = "Internal error",
807 [MESHLINK_ERESOLV] = "Could not resolve hostname",
808 [MESHLINK_ESTORAGE] = "Storage error",
809 [MESHLINK_ENETWORK] = "Network error",
810 [MESHLINK_EPEER] = "Error communicating with peer",
811 [MESHLINK_ENOTSUP] = "Operation not supported",
812 [MESHLINK_EBUSY] = "MeshLink instance already in use",
813 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
816 const char *meshlink_strerror(meshlink_errno_t err) {
817 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
818 return "Invalid error code";
824 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
825 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
827 mesh->private_key = ecdsa_generate();
829 if(!mesh->private_key) {
830 logger(mesh, MESHLINK_ERROR, "Error during key generation!\n");
831 meshlink_errno = MESHLINK_EINTERNAL;
835 logger(mesh, MESHLINK_DEBUG, "Done.\n");
840 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
841 if(a->tv_sec == b->tv_sec) {
842 return a->tv_nsec < b->tv_nsec;
844 return a->tv_sec < b->tv_sec;
848 static struct timespec idle(event_loop_t *loop, void *data) {
850 meshlink_handle_t *mesh = data;
851 struct timespec t, tmin = {3600, 0};
853 for splay_each(node_t, n, mesh->nodes) {
858 t = utcp_timeout(n->utcp);
860 if(timespec_lt(&t, &tmin)) {
868 // Get our local address(es) by simulating connecting to an Internet host.
869 static void add_local_addresses(meshlink_handle_t *mesh) {
871 sa.storage.ss_family = AF_UNKNOWN;
872 socklen_t salen = sizeof(sa);
876 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
877 sa.in.sin_port = ntohs(atoi(mesh->myport));
878 node_add_recent_address(mesh, mesh->self, &sa);
885 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
886 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
887 node_add_recent_address(mesh, mesh->self, &sa);
891 static bool meshlink_setup(meshlink_handle_t *mesh) {
892 if(!config_destroy(mesh->confbase, "new")) {
893 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
894 meshlink_errno = MESHLINK_ESTORAGE;
898 if(!config_destroy(mesh->confbase, "old")) {
899 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
900 meshlink_errno = MESHLINK_ESTORAGE;
904 if(!config_init(mesh, "current")) {
905 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
906 meshlink_errno = MESHLINK_ESTORAGE;
910 if(!ecdsa_keygen(mesh)) {
911 meshlink_errno = MESHLINK_EINTERNAL;
915 if(check_port(mesh) == 0) {
916 meshlink_errno = MESHLINK_ENETWORK;
920 /* Create a node for ourself */
922 mesh->self = new_node();
923 mesh->self->name = xstrdup(mesh->name);
924 mesh->self->devclass = mesh->devclass;
925 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
926 mesh->self->session_id = mesh->session_id;
928 if(!write_main_config_files(mesh)) {
929 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
930 meshlink_errno = MESHLINK_ESTORAGE;
934 /* Ensure the configuration directory metadata is on disk */
935 if(!config_sync(mesh, "current")) {
942 static bool meshlink_read_config(meshlink_handle_t *mesh) {
945 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
946 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
950 packmsg_input_t in = {config.buf, config.len};
951 const void *private_key;
953 uint32_t version = packmsg_get_uint32(&in);
954 char *name = packmsg_get_str_dup(&in);
955 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
956 packmsg_skip_element(&in); // Invitation key is not supported
957 uint16_t myport = packmsg_get_uint16(&in);
959 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96) {
960 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
962 config_free(&config);
966 if(mesh->name && strcmp(mesh->name, name)) {
967 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
968 meshlink_errno = MESHLINK_ESTORAGE;
970 config_free(&config);
976 xasprintf(&mesh->myport, "%u", myport);
977 mesh->private_key = ecdsa_set_private_key(private_key);
978 config_free(&config);
980 /* Create a node for ourself and read our host configuration file */
982 mesh->self = new_node();
983 mesh->self->name = xstrdup(name);
984 mesh->self->devclass = mesh->devclass;
985 mesh->self->session_id = mesh->session_id;
987 if(!node_read_public_key(mesh, mesh->self)) {
988 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
989 meshlink_errno = MESHLINK_ESTORAGE;
990 free_node(mesh->self);
999 static void *setup_network_in_netns_thread(void *arg) {
1000 meshlink_handle_t *mesh = arg;
1002 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1006 bool success = setup_network(mesh);
1007 return success ? arg : NULL;
1009 #endif // HAVE_SETNS
1011 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1012 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass);
1014 if(!confbase || !*confbase) {
1015 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1016 meshlink_errno = MESHLINK_EINVAL;
1020 if(!appname || !*appname) {
1021 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1022 meshlink_errno = MESHLINK_EINVAL;
1026 if(strchr(appname, ' ')) {
1027 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1028 meshlink_errno = MESHLINK_EINVAL;
1032 if(name && !check_id(name)) {
1033 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1034 meshlink_errno = MESHLINK_EINVAL;
1038 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1039 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1040 meshlink_errno = MESHLINK_EINVAL;
1044 meshlink_open_params_t *params = xzalloc(sizeof * params);
1046 params->confbase = xstrdup(confbase);
1047 params->name = name ? xstrdup(name) : NULL;
1048 params->appname = xstrdup(appname);
1049 params->devclass = devclass;
1052 xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase);
1057 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1058 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns);
1061 meshlink_errno = MESHLINK_EINVAL;
1065 params->netns = netns;
1070 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1071 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen);
1074 meshlink_errno = MESHLINK_EINVAL;
1078 if((!key && keylen) || (key && !keylen)) {
1079 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1080 meshlink_errno = MESHLINK_EINVAL;
1085 params->keylen = keylen;
1090 bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) {
1091 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy);
1094 meshlink_errno = MESHLINK_EINVAL;
1098 params->storage_policy = policy;
1103 bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) {
1104 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename);
1106 if(!params || !filename) {
1107 meshlink_errno = MESHLINK_EINVAL;
1111 free(params->lock_filename);
1112 params->lock_filename = xstrdup(filename);
1117 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1118 logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen);
1120 if(!mesh || !new_key || !new_keylen) {
1121 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1122 meshlink_errno = MESHLINK_EINVAL;
1126 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1130 // Create hash for the new key
1131 void *new_config_key;
1132 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1134 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1135 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1136 meshlink_errno = MESHLINK_EINTERNAL;
1137 pthread_mutex_unlock(&mesh->mutex);
1141 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1143 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1144 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1145 meshlink_errno = MESHLINK_ESTORAGE;
1146 pthread_mutex_unlock(&mesh->mutex);
1150 devtool_keyrotate_probe(1);
1152 // Rename confbase/current/ to confbase/old
1154 if(!config_rename(mesh, "current", "old")) {
1155 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1156 meshlink_errno = MESHLINK_ESTORAGE;
1157 pthread_mutex_unlock(&mesh->mutex);
1161 devtool_keyrotate_probe(2);
1163 // Rename confbase/new/ to confbase/current
1165 if(!config_rename(mesh, "new", "current")) {
1166 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1167 meshlink_errno = MESHLINK_ESTORAGE;
1168 pthread_mutex_unlock(&mesh->mutex);
1172 devtool_keyrotate_probe(3);
1174 // Cleanup the "old" confbase sub-directory
1176 if(!config_destroy(mesh->confbase, "old")) {
1177 pthread_mutex_unlock(&mesh->mutex);
1181 // Change the mesh handle key with new key
1183 free(mesh->config_key);
1184 mesh->config_key = new_config_key;
1186 pthread_mutex_unlock(&mesh->mutex);
1191 void meshlink_open_params_free(meshlink_open_params_t *params) {
1192 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()");
1195 meshlink_errno = MESHLINK_EINVAL;
1199 free(params->confbase);
1201 free(params->appname);
1202 free(params->lock_filename);
1207 /// Device class traits
1208 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1209 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1210 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1211 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1212 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1215 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1216 logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass);
1218 if(!confbase || !*confbase) {
1219 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1220 meshlink_errno = MESHLINK_EINVAL;
1224 char lock_filename[PATH_MAX];
1225 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1227 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1228 meshlink_open_params_t params = {
1229 .confbase = (char *)confbase,
1230 .lock_filename = lock_filename,
1231 .name = (char *)name,
1232 .appname = (char *)appname,
1233 .devclass = devclass,
1237 return meshlink_open_ex(¶ms);
1240 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) {
1241 logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen);
1243 if(!confbase || !*confbase) {
1244 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1245 meshlink_errno = MESHLINK_EINVAL;
1249 char lock_filename[PATH_MAX];
1250 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1252 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1253 meshlink_open_params_t params = {
1254 .confbase = (char *)confbase,
1255 .lock_filename = lock_filename,
1256 .name = (char *)name,
1257 .appname = (char *)appname,
1258 .devclass = devclass,
1262 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1266 return meshlink_open_ex(¶ms);
1269 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1270 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass);
1273 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1274 meshlink_errno = MESHLINK_EINVAL;
1278 if(!check_id(name)) {
1279 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1280 meshlink_errno = MESHLINK_EINVAL;
1284 if(!appname || !*appname) {
1285 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1286 meshlink_errno = MESHLINK_EINVAL;
1290 if(strchr(appname, ' ')) {
1291 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1292 meshlink_errno = MESHLINK_EINVAL;
1296 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1297 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1298 meshlink_errno = MESHLINK_EINVAL;
1302 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1303 meshlink_open_params_t params = {
1304 .name = (char *)name,
1305 .appname = (char *)appname,
1306 .devclass = devclass,
1310 return meshlink_open_ex(¶ms);
1313 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1314 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()");
1316 // Validate arguments provided by the application
1317 if(!params->appname || !*params->appname) {
1318 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1319 meshlink_errno = MESHLINK_EINVAL;
1323 if(strchr(params->appname, ' ')) {
1324 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1325 meshlink_errno = MESHLINK_EINVAL;
1329 if(params->name && !check_id(params->name)) {
1330 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1331 meshlink_errno = MESHLINK_EINVAL;
1335 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1336 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1337 meshlink_errno = MESHLINK_EINVAL;
1341 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1342 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1343 meshlink_errno = MESHLINK_EINVAL;
1347 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1349 if(params->confbase) {
1350 mesh->confbase = xstrdup(params->confbase);
1353 mesh->appname = xstrdup(params->appname);
1354 mesh->devclass = params->devclass;
1355 mesh->netns = params->netns;
1356 mesh->submeshes = NULL;
1357 mesh->log_cb = global_log_cb;
1358 mesh->log_level = global_log_level;
1359 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1361 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1364 randomize(&mesh->session_id, sizeof(mesh->session_id));
1365 } while(mesh->session_id == 0);
1367 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1369 mesh->name = params->name ? xstrdup(params->name) : NULL;
1373 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1375 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1376 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1377 meshlink_close(mesh);
1378 meshlink_errno = MESHLINK_EINTERNAL;
1383 // initialize mutexes and conds
1384 pthread_mutexattr_t attr;
1385 pthread_mutexattr_init(&attr);
1387 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1391 pthread_mutex_init(&mesh->mutex, &attr);
1392 pthread_cond_init(&mesh->cond, NULL);
1394 pthread_cond_init(&mesh->adns_cond, NULL);
1396 mesh->threadstarted = false;
1397 event_loop_init(&mesh->loop);
1398 mesh->loop.data = mesh;
1400 meshlink_queue_init(&mesh->outpacketqueue);
1402 // Atomically lock the configuration directory.
1403 if(!main_config_lock(mesh, params->lock_filename)) {
1404 meshlink_close(mesh);
1408 // If no configuration exists yet, create it.
1410 bool new_configuration = false;
1412 if(!meshlink_confbase_exists(mesh)) {
1414 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1415 meshlink_close(mesh);
1416 meshlink_errno = MESHLINK_ESTORAGE;
1420 if(!meshlink_setup(mesh)) {
1421 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1422 meshlink_close(mesh);
1426 new_configuration = true;
1428 if(!meshlink_read_config(mesh)) {
1429 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1430 meshlink_close(mesh);
1435 mesh->storage_policy = params->storage_policy;
1438 struct WSAData wsa_state;
1439 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1442 // Setup up everything
1443 // TODO: we should not open listening sockets yet
1445 bool success = false;
1447 if(mesh->netns != -1) {
1451 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1452 void *retval = NULL;
1453 success = pthread_join(thr, &retval) == 0 && retval;
1457 meshlink_errno = MESHLINK_EINTERNAL;
1460 #endif // HAVE_SETNS
1462 success = setup_network(mesh);
1466 meshlink_close(mesh);
1467 meshlink_errno = MESHLINK_ENETWORK;
1471 add_local_addresses(mesh);
1473 if(!node_write_config(mesh, mesh->self, new_configuration)) {
1474 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1478 idle_set(&mesh->loop, idle, mesh);
1480 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1484 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1485 logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh);
1487 meshlink_submesh_t *s = NULL;
1490 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1491 meshlink_errno = MESHLINK_EINVAL;
1495 if(!submesh || !*submesh) {
1496 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1497 meshlink_errno = MESHLINK_EINVAL;
1502 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1506 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1508 pthread_mutex_unlock(&mesh->mutex);
1513 static void *meshlink_main_loop(void *arg) {
1514 meshlink_handle_t *mesh = arg;
1516 if(mesh->netns != -1) {
1519 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1520 pthread_cond_signal(&mesh->cond);
1525 pthread_cond_signal(&mesh->cond);
1527 #endif // HAVE_SETNS
1530 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1534 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1535 pthread_cond_broadcast(&mesh->cond);
1537 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1539 pthread_mutex_unlock(&mesh->mutex);
1544 bool meshlink_start(meshlink_handle_t *mesh) {
1546 meshlink_errno = MESHLINK_EINVAL;
1550 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1552 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1557 assert(mesh->private_key);
1558 assert(mesh->self->ecdsa);
1559 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1561 if(mesh->threadstarted) {
1562 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1563 pthread_mutex_unlock(&mesh->mutex);
1567 if(mesh->listen_socket[0].tcp.fd < 0) {
1568 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1569 meshlink_errno = MESHLINK_ENETWORK;
1573 // Reset node connection timers
1574 for splay_each(node_t, n, mesh->nodes) {
1575 n->last_connect_try = 0;
1578 // TODO: open listening sockets first
1580 //Check that a valid name is set
1582 logger(mesh, MESHLINK_ERROR, "No name given!\n");
1583 meshlink_errno = MESHLINK_EINVAL;
1584 pthread_mutex_unlock(&mesh->mutex);
1588 init_outgoings(mesh);
1591 // Start the main thread
1593 event_loop_start(&mesh->loop);
1595 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1596 pthread_attr_t attr;
1597 pthread_attr_init(&attr);
1598 pthread_attr_setstacksize(&attr, 1024 * 1024);
1600 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1601 logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno));
1602 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1603 meshlink_errno = MESHLINK_EINTERNAL;
1604 event_loop_stop(&mesh->loop);
1605 pthread_mutex_unlock(&mesh->mutex);
1609 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1610 mesh->threadstarted = true;
1612 pthread_mutex_unlock(&mesh->mutex);
1616 void meshlink_stop(meshlink_handle_t *mesh) {
1617 logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n");
1620 meshlink_errno = MESHLINK_EINVAL;
1624 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1628 // Shut down the main thread
1629 event_loop_stop(&mesh->loop);
1631 // TODO: send something to a local socket to kick the event loop
1633 if(mesh->threadstarted) {
1634 // Wait for the main thread to finish
1635 pthread_mutex_unlock(&mesh->mutex);
1637 if(pthread_join(mesh->thread, NULL) != 0) {
1641 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1645 mesh->threadstarted = false;
1648 // Close all metaconnections
1649 if(mesh->connections) {
1650 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1652 connection_t *c = node->data;
1654 terminate_connection(mesh, c, false);
1659 exit_outgoings(mesh);
1661 // Try to write out any changed node config files, ignore errors at this point.
1663 for splay_each(node_t, n, mesh->nodes) {
1664 if(n->status.dirty) {
1665 if(!node_write_config(mesh, n, false)) {
1672 pthread_mutex_unlock(&mesh->mutex);
1675 void meshlink_close(meshlink_handle_t *mesh) {
1676 logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n");
1679 meshlink_errno = MESHLINK_EINVAL;
1683 // stop can be called even if mesh has not been started
1684 meshlink_stop(mesh);
1686 // lock is not released after this
1687 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1691 // Close and free all resources used.
1693 close_network_connections(mesh);
1695 logger(mesh, MESHLINK_INFO, "Terminating");
1697 event_loop_exit(&mesh->loop);
1701 if(mesh->confbase) {
1707 if(mesh->netns != -1) {
1711 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1715 meshlink_queue_exit(&mesh->outpacketqueue);
1718 free(mesh->appname);
1719 free(mesh->confbase);
1720 free(mesh->config_key);
1721 free(mesh->external_address_url);
1723 ecdsa_free(mesh->private_key);
1725 main_config_unlock(mesh);
1727 pthread_mutex_unlock(&mesh->mutex);
1728 pthread_mutex_destroy(&mesh->mutex);
1730 memset(mesh, 0, sizeof(*mesh));
1735 bool meshlink_destroy_ex(const meshlink_open_params_t *params) {
1736 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n");
1739 meshlink_errno = MESHLINK_EINVAL;
1743 if(!params->confbase) {
1744 /* Ephemeral instances */
1748 /* Exit early if the confbase directory itself doesn't exist */
1749 if(access(params->confbase, F_OK) && errno == ENOENT) {
1753 /* Take the lock the same way meshlink_open() would. */
1754 FILE *lockfile = fopen(params->lock_filename, "w+");
1757 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno));
1758 meshlink_errno = MESHLINK_ESTORAGE;
1763 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1767 // TODO: use _locking()?
1770 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1771 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename);
1773 meshlink_errno = MESHLINK_EBUSY;
1779 if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) {
1780 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno));
1784 if(unlink(params->lock_filename)) {
1785 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno));
1787 meshlink_errno = MESHLINK_ESTORAGE;
1793 if(!sync_path(params->confbase)) {
1794 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno));
1795 meshlink_errno = MESHLINK_ESTORAGE;
1802 bool meshlink_destroy(const char *confbase) {
1803 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase);
1805 char lock_filename[PATH_MAX];
1806 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1808 meshlink_open_params_t params = {
1809 .confbase = (char *)confbase,
1810 .lock_filename = lock_filename,
1813 return meshlink_destroy_ex(¶ms);
1816 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1817 logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb);
1820 meshlink_errno = MESHLINK_EINVAL;
1824 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1828 mesh->receive_cb = cb;
1829 pthread_mutex_unlock(&mesh->mutex);
1832 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1833 logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb);
1836 meshlink_errno = MESHLINK_EINVAL;
1840 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1844 mesh->connection_try_cb = cb;
1845 pthread_mutex_unlock(&mesh->mutex);
1848 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1849 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb);
1852 meshlink_errno = MESHLINK_EINVAL;
1856 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1860 mesh->node_status_cb = cb;
1861 pthread_mutex_unlock(&mesh->mutex);
1864 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1865 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb);
1868 meshlink_errno = MESHLINK_EINVAL;
1872 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1876 mesh->node_pmtu_cb = cb;
1877 pthread_mutex_unlock(&mesh->mutex);
1880 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1881 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb);
1884 meshlink_errno = MESHLINK_EINVAL;
1888 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1892 mesh->node_duplicate_cb = cb;
1893 pthread_mutex_unlock(&mesh->mutex);
1896 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1897 logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb);
1900 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1905 mesh->log_level = cb ? level : 0;
1906 pthread_mutex_unlock(&mesh->mutex);
1909 global_log_level = cb ? level : 0;
1913 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1914 logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb);
1917 meshlink_errno = MESHLINK_EINVAL;
1921 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1925 mesh->error_cb = cb;
1926 pthread_mutex_unlock(&mesh->mutex);
1929 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
1930 meshlink_packethdr_t *hdr;
1932 if(len > MAXSIZE - sizeof(*hdr)) {
1933 meshlink_errno = MESHLINK_EINVAL;
1937 node_t *n = (node_t *)destination;
1939 if(n->status.blacklisted) {
1940 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1941 meshlink_errno = MESHLINK_EBLACKLISTED;
1945 // Prepare the packet
1946 packet->probe = false;
1947 packet->tcp = false;
1948 packet->len = len + sizeof(*hdr);
1950 hdr = (meshlink_packethdr_t *)packet->data;
1951 memset(hdr, 0, sizeof(*hdr));
1952 // leave the last byte as 0 to make sure strings are always
1953 // null-terminated if they are longer than the buffer
1954 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
1955 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
1957 memcpy(packet->data + sizeof(*hdr), data, len);
1962 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1964 assert(destination);
1968 // Prepare the packet
1969 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
1973 // Send it immediately
1974 route(mesh, mesh->self, mesh->packet);
1979 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1980 logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len);
1982 // Validate arguments
1983 if(!mesh || !destination) {
1984 meshlink_errno = MESHLINK_EINVAL;
1993 meshlink_errno = MESHLINK_EINVAL;
1997 // Prepare the packet
1998 vpn_packet_t *packet = malloc(sizeof(*packet));
2001 meshlink_errno = MESHLINK_ENOMEM;
2005 if(!prepare_packet(mesh, destination, data, len, packet)) {
2011 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2013 meshlink_errno = MESHLINK_ENOMEM;
2017 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2019 // Notify event loop
2020 signal_trigger(&mesh->loop, &mesh->datafromapp);
2025 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2027 meshlink_handle_t *mesh = data;
2029 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2031 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2032 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2033 mesh->self->in_packets++;
2034 mesh->self->in_bytes += packet->len;
2035 route(mesh, mesh->self, packet);
2040 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2041 if(!mesh || !destination) {
2042 meshlink_errno = MESHLINK_EINVAL;
2046 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2050 node_t *n = (node_t *)destination;
2052 if(!n->status.reachable) {
2053 pthread_mutex_unlock(&mesh->mutex);
2056 } else if(n->mtuprobes > 30 && n->minmtu) {
2057 pthread_mutex_unlock(&mesh->mutex);
2060 pthread_mutex_unlock(&mesh->mutex);
2065 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2066 if(!mesh || !node) {
2067 meshlink_errno = MESHLINK_EINVAL;
2071 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2075 node_t *n = (node_t *)node;
2077 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2078 meshlink_errno = MESHLINK_EINTERNAL;
2079 pthread_mutex_unlock(&mesh->mutex);
2083 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2086 meshlink_errno = MESHLINK_EINTERNAL;
2089 pthread_mutex_unlock(&mesh->mutex);
2093 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2095 meshlink_errno = MESHLINK_EINVAL;
2099 return (meshlink_node_t *)mesh->self;
2102 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2103 if(!mesh || !name) {
2104 meshlink_errno = MESHLINK_EINVAL;
2110 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2114 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2115 pthread_mutex_unlock(&mesh->mutex);
2118 meshlink_errno = MESHLINK_ENOENT;
2121 return (meshlink_node_t *)n;
2124 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2125 if(!mesh || !name) {
2126 meshlink_errno = MESHLINK_EINVAL;
2130 meshlink_submesh_t *submesh = NULL;
2132 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2136 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2137 pthread_mutex_unlock(&mesh->mutex);
2140 meshlink_errno = MESHLINK_ENOENT;
2146 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2147 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2148 meshlink_errno = MESHLINK_EINVAL;
2152 meshlink_node_t **result;
2155 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2159 *nmemb = mesh->nodes->count;
2160 result = realloc(nodes, *nmemb * sizeof(*nodes));
2163 meshlink_node_t **p = result;
2165 for splay_each(node_t, n, mesh->nodes) {
2166 *p++ = (meshlink_node_t *)n;
2171 meshlink_errno = MESHLINK_ENOMEM;
2174 pthread_mutex_unlock(&mesh->mutex);
2179 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) {
2180 meshlink_node_t **result;
2182 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2188 for splay_each(node_t, n, mesh->nodes) {
2189 if(search_node(n, condition)) {
2196 pthread_mutex_unlock(&mesh->mutex);
2200 result = realloc(nodes, *nmemb * sizeof(*nodes));
2203 meshlink_node_t **p = result;
2205 for splay_each(node_t, n, mesh->nodes) {
2206 if(search_node(n, condition)) {
2207 *p++ = (meshlink_node_t *)n;
2213 meshlink_errno = MESHLINK_ENOMEM;
2216 pthread_mutex_unlock(&mesh->mutex);
2221 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2222 dev_class_t *devclass = (dev_class_t *)condition;
2224 if(*devclass == (dev_class_t)node->devclass) {
2231 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2232 if(condition == node->submesh) {
2244 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) {
2245 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2246 meshlink_errno = MESHLINK_EINVAL;
2250 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2253 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2254 if(!mesh || !submesh || !nmemb) {
2255 meshlink_errno = MESHLINK_EINVAL;
2259 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2262 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2263 if(!mesh || !node) {
2264 meshlink_errno = MESHLINK_EINVAL;
2268 dev_class_t devclass;
2270 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2274 devclass = ((node_t *)node)->devclass;
2276 pthread_mutex_unlock(&mesh->mutex);
2281 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2282 if(!mesh || !node) {
2283 meshlink_errno = MESHLINK_EINVAL;
2287 node_t *n = (node_t *)node;
2289 meshlink_submesh_t *s;
2291 s = (meshlink_submesh_t *)n->submesh;
2296 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2297 if(!mesh || !node) {
2298 meshlink_errno = MESHLINK_EINVAL;
2302 node_t *n = (node_t *)node;
2305 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2309 reachable = n->status.reachable && !n->status.blacklisted;
2311 // TODO: handle reachable times?
2312 (void)last_reachable;
2313 (void)last_unreachable;
2315 pthread_mutex_unlock(&mesh->mutex);
2320 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2321 logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen);
2323 if(!mesh || !data || !len || !signature || !siglen) {
2324 meshlink_errno = MESHLINK_EINVAL;
2328 if(*siglen < MESHLINK_SIGLEN) {
2329 meshlink_errno = MESHLINK_EINVAL;
2333 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2337 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2338 meshlink_errno = MESHLINK_EINTERNAL;
2339 pthread_mutex_unlock(&mesh->mutex);
2343 *siglen = MESHLINK_SIGLEN;
2344 pthread_mutex_unlock(&mesh->mutex);
2348 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2349 logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen);
2351 if(!mesh || !source || !data || !len || !signature) {
2352 meshlink_errno = MESHLINK_EINVAL;
2356 if(siglen != MESHLINK_SIGLEN) {
2357 meshlink_errno = MESHLINK_EINVAL;
2361 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2367 struct node_t *n = (struct node_t *)source;
2369 if(!node_read_public_key(mesh, n)) {
2370 meshlink_errno = MESHLINK_EINTERNAL;
2373 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2376 pthread_mutex_unlock(&mesh->mutex);
2380 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2381 logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)");
2383 if(!mesh || !node || !address) {
2384 meshlink_errno = MESHLINK_EINVAL;
2388 if(!is_valid_hostname(address)) {
2389 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address);
2390 meshlink_errno = MESHLINK_EINVAL;
2394 if((node_t *)node != mesh->self && !port) {
2395 logger(mesh, MESHLINK_ERROR, "Missing port number!");
2396 meshlink_errno = MESHLINK_EINVAL;
2401 if(port && !is_valid_port(port)) {
2402 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address);
2403 meshlink_errno = MESHLINK_EINVAL;
2407 char *canonical_address;
2409 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2411 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2415 node_t *n = (node_t *)node;
2416 free(n->canonical_address);
2417 n->canonical_address = canonical_address;
2419 if(!node_write_config(mesh, n, false)) {
2420 pthread_mutex_unlock(&mesh->mutex);
2424 pthread_mutex_unlock(&mesh->mutex);
2426 return config_sync(mesh, "current");
2429 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2430 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)");
2432 if(!mesh || !node) {
2433 meshlink_errno = MESHLINK_EINVAL;
2437 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2441 node_t *n = (node_t *)node;
2442 free(n->canonical_address);
2443 n->canonical_address = NULL;
2445 if(!node_write_config(mesh, n, false)) {
2446 pthread_mutex_unlock(&mesh->mutex);
2450 pthread_mutex_unlock(&mesh->mutex);
2452 return config_sync(mesh, "current");
2455 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2456 logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)");
2458 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2461 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2462 logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()");
2465 meshlink_errno = MESHLINK_EINVAL;
2469 char *address = meshlink_get_external_address(mesh);
2475 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2481 int meshlink_get_port(meshlink_handle_t *mesh) {
2483 meshlink_errno = MESHLINK_EINVAL;
2488 meshlink_errno = MESHLINK_EINTERNAL;
2494 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2498 port = atoi(mesh->myport);
2499 pthread_mutex_unlock(&mesh->mutex);
2504 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2505 logger(mesh, MESHLINK_DEBUG, "meshlink_set_port(%d)", port);
2507 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2508 meshlink_errno = MESHLINK_EINVAL;
2512 if(mesh->myport && port == atoi(mesh->myport)) {
2516 if(!try_bind(mesh, port)) {
2517 meshlink_errno = MESHLINK_ENETWORK;
2521 devtool_trybind_probe();
2525 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2529 if(mesh->threadstarted) {
2530 meshlink_errno = MESHLINK_EINVAL;
2535 xasprintf(&mesh->myport, "%d", port);
2537 /* Close down the network. This also deletes mesh->self. */
2538 close_network_connections(mesh);
2540 /* Recreate mesh->self. */
2541 mesh->self = new_node();
2542 mesh->self->name = xstrdup(mesh->name);
2543 mesh->self->devclass = mesh->devclass;
2544 mesh->self->session_id = mesh->session_id;
2545 xasprintf(&mesh->myport, "%d", port);
2547 if(!node_read_public_key(mesh, mesh->self)) {
2548 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2549 meshlink_errno = MESHLINK_ESTORAGE;
2550 free_node(mesh->self);
2553 } else if(!setup_network(mesh)) {
2554 meshlink_errno = MESHLINK_ENETWORK;
2558 /* Rebuild our own list of recent addresses */
2559 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2560 add_local_addresses(mesh);
2562 /* Write meshlink.conf with the updated port number */
2563 write_main_config_files(mesh);
2565 rval = config_sync(mesh, "current");
2568 pthread_mutex_unlock(&mesh->mutex);
2570 return rval && meshlink_get_port(mesh) == port;
2573 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2574 logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)");
2576 if(!mesh || !invitation) {
2577 meshlink_errno = MESHLINK_EINVAL;
2581 if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) {
2582 meshlink_errno = MESHLINK_EINVAL;
2586 join_state_t state = {
2591 ecdsa_t *key = NULL;
2592 ecdsa_t *hiskey = NULL;
2594 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2595 char copy[strlen(invitation) + 1];
2597 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2601 //Before doing meshlink_join make sure we are not connected to another mesh
2602 if(mesh->threadstarted) {
2603 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2604 meshlink_errno = MESHLINK_EINVAL;
2608 // 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.
2609 if(mesh->nodes->count > 1) {
2610 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2611 meshlink_errno = MESHLINK_EINVAL;
2615 strcpy(copy, invitation);
2617 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2619 char *slash = strchr(copy, '/');
2627 if(strlen(slash) != 48) {
2631 char *address = copy;
2634 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2638 if(mesh->inviter_commits_first) {
2639 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2642 // Generate a throw-away key for the invitation.
2643 key = ecdsa_generate();
2646 meshlink_errno = MESHLINK_EINTERNAL;
2650 char *b64key = ecdsa_get_base64_public_key(key);
2653 while(address && *address) {
2654 // We allow commas in the address part to support multiple addresses in one invitation URL.
2655 comma = strchr(address, ',');
2661 // Split of the port
2662 port = strrchr(address, ':');
2670 // IPv6 address are enclosed in brackets, per RFC 3986
2671 if(*address == '[') {
2673 char *bracket = strchr(address, ']');
2686 // Connect to the meshlink daemon mentioned in the URL.
2687 struct addrinfo *ai = adns_blocking_request(mesh, xstrdup(address), xstrdup(port), SOCK_STREAM, 30);
2690 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2691 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
2693 if(state.sock == -1) {
2694 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2695 meshlink_errno = MESHLINK_ENETWORK;
2701 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
2704 set_timeout(state.sock, 5000);
2706 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2707 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2708 meshlink_errno = MESHLINK_ENETWORK;
2709 closesocket(state.sock);
2719 meshlink_errno = MESHLINK_ERESOLV;
2722 if(state.sock != -1 || !comma) {
2729 if(state.sock == -1) {
2733 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2735 // Tell him we have an invitation, and give him our throw-away key.
2739 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2740 logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2741 meshlink_errno = MESHLINK_ENETWORK;
2747 char hisname[4096] = "";
2748 int code, hismajor, hisminor = 0;
2750 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) {
2751 logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n");
2752 meshlink_errno = MESHLINK_ENETWORK;
2756 // Check if the hash of the key he gave us matches the hash in the URL.
2757 char *fingerprint = state.line + 2;
2760 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2761 logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2);
2762 meshlink_errno = MESHLINK_EINTERNAL;
2766 if(memcmp(hishash, state.hash, 18)) {
2767 logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2);
2768 meshlink_errno = MESHLINK_EPEER;
2772 hiskey = ecdsa_set_base64_public_key(fingerprint);
2775 meshlink_errno = MESHLINK_EINTERNAL;
2779 // Start an SPTPS session
2780 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2781 meshlink_errno = MESHLINK_EINTERNAL;
2785 // Feed rest of input buffer to SPTPS
2786 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2787 meshlink_errno = MESHLINK_EPEER;
2792 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2794 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2796 if(errno == EINTR) {
2800 logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2801 meshlink_errno = MESHLINK_ENETWORK;
2805 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2806 meshlink_errno = MESHLINK_EPEER;
2811 if(!state.success) {
2812 logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n");
2813 meshlink_errno = MESHLINK_EPEER;
2817 sptps_stop(&state.sptps);
2820 closesocket(state.sock);
2822 pthread_mutex_unlock(&mesh->mutex);
2826 logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n");
2827 meshlink_errno = MESHLINK_EINVAL;
2829 sptps_stop(&state.sptps);
2833 if(state.sock != -1) {
2834 closesocket(state.sock);
2837 pthread_mutex_unlock(&mesh->mutex);
2841 char *meshlink_export(meshlink_handle_t *mesh) {
2843 meshlink_errno = MESHLINK_EINVAL;
2847 // Create a config file on the fly.
2850 packmsg_output_t out = {buf, sizeof(buf)};
2851 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2852 packmsg_add_str(&out, mesh->name);
2853 packmsg_add_str(&out, CORE_MESH);
2855 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2859 packmsg_add_int32(&out, mesh->self->devclass);
2860 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2861 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2863 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
2864 char *canonical_address = NULL;
2865 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
2866 packmsg_add_str(&out, canonical_address);
2867 free(canonical_address);
2869 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2874 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2875 if(mesh->self->recent[i].sa.sa_family) {
2882 packmsg_add_array(&out, count);
2884 for(uint32_t i = 0; i < count; i++) {
2885 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2888 packmsg_add_int64(&out, 0);
2889 packmsg_add_int64(&out, 0);
2891 pthread_mutex_unlock(&mesh->mutex);
2893 if(!packmsg_output_ok(&out)) {
2894 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2895 meshlink_errno = MESHLINK_EINTERNAL;
2899 // Prepare a base64-encoded packmsg array containing our config file
2901 uint32_t len = packmsg_output_size(&out, buf);
2902 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2903 uint8_t *buf2 = xmalloc(len2);
2904 packmsg_output_t out2 = {buf2, len2};
2905 packmsg_add_array(&out2, 1);
2906 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2908 if(!packmsg_output_ok(&out2)) {
2909 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2910 meshlink_errno = MESHLINK_EINTERNAL;
2915 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2917 return (char *)buf2;
2920 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2921 logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data);
2923 if(!mesh || !data) {
2924 meshlink_errno = MESHLINK_EINVAL;
2928 size_t datalen = strlen(data);
2929 uint8_t *buf = xmalloc(datalen);
2930 int buflen = b64decode(data, buf, datalen);
2933 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2935 meshlink_errno = MESHLINK_EPEER;
2939 packmsg_input_t in = {buf, buflen};
2940 uint32_t count = packmsg_get_array(&in);
2943 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2945 meshlink_errno = MESHLINK_EPEER;
2949 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2955 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
2961 packmsg_input_t in2 = {data2, len2};
2962 uint32_t version = packmsg_get_uint32(&in2);
2963 char *name = packmsg_get_str_dup(&in2);
2965 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2967 packmsg_input_invalidate(&in);
2971 if(!check_id(name)) {
2976 node_t *n = lookup_node(mesh, name);
2979 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2987 config_t config = {data2, len2};
2989 if(!node_read_from_config(mesh, n, &config)) {
2991 packmsg_input_invalidate(&in);
2995 if(!node_write_config(mesh, n, true)) {
3004 pthread_mutex_unlock(&mesh->mutex);
3008 if(!packmsg_done(&in)) {
3009 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3010 meshlink_errno = MESHLINK_EPEER;
3014 if(!config_sync(mesh, "current")) {
3021 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3022 logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)");
3024 if(!mesh || !node) {
3025 meshlink_errno = MESHLINK_EINVAL;
3029 node_t *n = (node_t *)node;
3031 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3035 /* Check that the node is not reachable */
3036 if(n->status.reachable || n->connection) {
3037 pthread_mutex_unlock(&mesh->mutex);
3038 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3042 /* Check that we don't have any active UTCP connections */
3043 if(n->utcp && utcp_is_active(n->utcp)) {
3044 pthread_mutex_unlock(&mesh->mutex);
3045 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3049 /* Check that we have no active connections to this node */
3050 for list_each(connection_t, c, mesh->connections) {
3052 pthread_mutex_unlock(&mesh->mutex);
3053 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3058 /* Remove any pending outgoings to this node */
3059 if(mesh->outgoings) {
3060 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3061 if(outgoing->node == n) {
3062 list_delete_node(mesh->outgoings, list_node);
3067 /* Delete the config file for this node */
3068 if(!config_delete(mesh, "current", n->name)) {
3069 pthread_mutex_unlock(&mesh->mutex);
3073 /* Delete the node struct and any remaining edges referencing this node */
3076 pthread_mutex_unlock(&mesh->mutex);
3078 return config_sync(mesh, "current");
3081 /* Hint that a hostname may be found at an address
3082 * See header file for detailed comment.
3084 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3085 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr);
3087 if(!mesh || !node || !addr) {
3088 meshlink_errno = EINVAL;
3092 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3096 node_t *n = (node_t *)node;
3098 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3099 if(!node_write_config(mesh, n, false)) {
3100 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3104 pthread_mutex_unlock(&mesh->mutex);
3105 // @TODO do we want to fire off a connection attempt right away?
3108 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3110 node_t *n = utcp->priv;
3111 meshlink_handle_t *mesh = n->mesh;
3113 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3114 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3116 return mesh->channel_accept_cb;
3120 /* Finish one AIO buffer, return true if the channel is still open. */
3121 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3122 meshlink_aio_buffer_t *aio = *head;
3126 channel->in_callback = true;
3129 if(aio->cb.buffer) {
3130 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3134 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3138 channel->in_callback = false;
3151 /* Finish all AIO buffers, return true if the channel is still open. */
3152 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3154 if(!aio_finish_one(mesh, channel, head)) {
3162 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3163 meshlink_channel_t *channel = connection->priv;
3169 node_t *n = channel->node;
3170 meshlink_handle_t *mesh = n->mesh;
3172 if(n->status.destroyed) {
3173 meshlink_channel_close(mesh, channel);
3177 const char *p = data;
3180 while(channel->aio_receive) {
3182 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3183 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3190 meshlink_aio_buffer_t *aio = channel->aio_receive;
3191 size_t todo = aio->len - aio->done;
3198 memcpy((char *)aio->data + aio->done, p, todo);
3200 ssize_t result = write(aio->fd, p, todo);
3203 if(result < 0 && errno == EINTR) {
3207 /* Writing to fd failed, cancel just this AIO buffer. */
3208 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3210 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3224 if(aio->done == aio->len) {
3225 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3235 if(channel->receive_cb) {
3236 channel->receive_cb(mesh, channel, p, left);
3242 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3243 node_t *n = utcp_connection->utcp->priv;
3249 meshlink_handle_t *mesh = n->mesh;
3251 if(!mesh->channel_accept_cb) {
3255 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3257 channel->c = utcp_connection;
3259 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3260 utcp_accept(utcp_connection, channel_recv, channel);
3266 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3267 node_t *n = utcp_connection->utcp->priv;
3268 meshlink_handle_t *mesh = n->mesh;
3270 if(n->mtuprobes == 31 && n->mtutimeout.cb) {
3271 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3277 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3278 node_t *n = utcp->priv;
3280 if(n->status.destroyed) {
3284 meshlink_handle_t *mesh = n->mesh;
3285 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3288 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3289 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3291 if(!mesh || !channel) {
3292 meshlink_errno = MESHLINK_EINVAL;
3296 channel->receive_cb = cb;
3299 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3301 node_t *n = (node_t *)source;
3307 utcp_recv(n->utcp, data, len);
3310 static void channel_poll(struct utcp_connection *connection, size_t len) {
3311 meshlink_channel_t *channel = connection->priv;
3317 node_t *n = channel->node;
3318 meshlink_handle_t *mesh = n->mesh;
3320 while(channel->aio_send) {
3322 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3323 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3330 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3331 meshlink_aio_buffer_t *aio = channel->aio_send;
3332 size_t todo = aio->len - aio->done;
3340 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3342 /* Limit the amount we read at once to avoid stack overflows */
3348 ssize_t result = read(aio->fd, buf, todo);
3352 sent = utcp_send(connection, buf, todo);
3354 if(result < 0 && errno == EINTR) {
3358 /* Reading from fd failed, cancel just this AIO buffer. */
3360 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3363 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3371 if(sent != (ssize_t)todo) {
3372 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3373 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3384 /* If we didn't finish this buffer, exit early. */
3385 if(aio->done < aio->len) {
3389 /* Signal completion of this buffer, and go to the next one. */
3390 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3399 if(channel->poll_cb) {
3400 channel->poll_cb(mesh, channel, len);
3402 utcp_set_poll_cb(connection, NULL);
3406 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3407 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3409 if(!mesh || !channel) {
3410 meshlink_errno = MESHLINK_EINVAL;
3414 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3418 channel->poll_cb = cb;
3419 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3420 pthread_mutex_unlock(&mesh->mutex);
3423 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
3424 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb);
3427 meshlink_errno = MESHLINK_EINVAL;
3431 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3435 mesh->channel_listen_cb = cb;
3437 pthread_mutex_unlock(&mesh->mutex);
3440 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3441 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb);
3444 meshlink_errno = MESHLINK_EINVAL;
3448 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3452 mesh->channel_accept_cb = cb;
3453 mesh->receive_cb = channel_receive;
3455 for splay_each(node_t, n, mesh->nodes) {
3456 if(!n->utcp && n != mesh->self) {
3457 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3458 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3459 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3463 pthread_mutex_unlock(&mesh->mutex);
3466 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3467 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
3469 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
3472 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3473 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
3475 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
3478 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3479 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3481 if(!mesh || !channel) {
3482 meshlink_errno = MESHLINK_EINVAL;
3486 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3490 utcp_set_sndbuf(channel->c, buf, size);
3491 pthread_mutex_unlock(&mesh->mutex);
3494 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3495 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3497 if(!mesh || !channel) {
3498 meshlink_errno = MESHLINK_EINVAL;
3502 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3506 utcp_set_rcvbuf(channel->c, buf, size);
3507 pthread_mutex_unlock(&mesh->mutex);
3510 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
3511 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
3513 if(!mesh || !channel) {
3514 meshlink_errno = MESHLINK_EINVAL;
3518 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3522 utcp_set_flags(channel->c, flags);
3523 pthread_mutex_unlock(&mesh->mutex);
3526 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) {
3527 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);
3530 abort(); // TODO: handle non-NULL data
3533 if(!mesh || !node) {
3534 meshlink_errno = MESHLINK_EINVAL;
3538 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3542 node_t *n = (node_t *)node;
3545 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3546 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3547 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3548 mesh->receive_cb = channel_receive;
3551 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3552 pthread_mutex_unlock(&mesh->mutex);
3557 if(n->status.blacklisted) {
3558 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3559 meshlink_errno = MESHLINK_EBLACKLISTED;
3560 pthread_mutex_unlock(&mesh->mutex);
3564 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3566 channel->receive_cb = cb;
3569 channel->priv = (void *)data;
3572 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3574 pthread_mutex_unlock(&mesh->mutex);
3577 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3585 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) {
3586 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len);
3588 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3591 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3592 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction);
3594 if(!mesh || !channel) {
3595 meshlink_errno = MESHLINK_EINVAL;
3599 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3603 utcp_shutdown(channel->c, direction);
3604 pthread_mutex_unlock(&mesh->mutex);
3607 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3608 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel);
3610 if(!mesh || !channel) {
3611 meshlink_errno = MESHLINK_EINVAL;
3615 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3620 utcp_close(channel->c);
3623 /* Clean up any outstanding AIO buffers. */
3624 aio_abort(mesh, channel, &channel->aio_send);
3625 aio_abort(mesh, channel, &channel->aio_receive);
3628 if(!channel->in_callback) {
3632 pthread_mutex_unlock(&mesh->mutex);
3635 void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3636 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel);
3638 if(!mesh || !channel) {
3639 meshlink_errno = MESHLINK_EINVAL;
3643 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3648 utcp_abort(channel->c);
3651 /* Clean up any outstanding AIO buffers. */
3652 aio_abort(mesh, channel, &channel->aio_send);
3653 aio_abort(mesh, channel, &channel->aio_receive);
3656 if(!channel->in_callback) {
3660 pthread_mutex_unlock(&mesh->mutex);
3663 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3664 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len);
3666 if(!mesh || !channel) {
3667 meshlink_errno = MESHLINK_EINVAL;
3676 meshlink_errno = MESHLINK_EINVAL;
3680 // TODO: more finegrained locking.
3681 // Ideally we want to put the data into the UTCP connection's send buffer.
3682 // Then, preferably only if there is room in the receiver window,
3683 // kick the meshlink thread to go send packets.
3687 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3691 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3692 if(channel->aio_send) {
3695 retval = utcp_send(channel->c, data, len);
3698 pthread_mutex_unlock(&mesh->mutex);
3701 meshlink_errno = MESHLINK_ENETWORK;
3707 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) {
3708 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3710 if(!mesh || !channel) {
3711 meshlink_errno = MESHLINK_EINVAL;
3716 meshlink_errno = MESHLINK_EINVAL;
3720 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3723 aio->cb.buffer = cb;
3726 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3730 /* Append the AIO buffer descriptor to the end of the chain */
3731 meshlink_aio_buffer_t **p = &channel->aio_send;
3739 /* Ensure the poll callback is set, and call it right now to push data if possible */
3740 utcp_set_poll_cb(channel->c, channel_poll);
3741 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
3744 channel_poll(channel->c, todo);
3747 pthread_mutex_unlock(&mesh->mutex);
3752 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) {
3753 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3755 if(!mesh || !channel) {
3756 meshlink_errno = MESHLINK_EINVAL;
3760 if(!len || fd == -1) {
3761 meshlink_errno = MESHLINK_EINVAL;
3765 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3771 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3775 /* Append the AIO buffer descriptor to the end of the chain */
3776 meshlink_aio_buffer_t **p = &channel->aio_send;
3784 /* Ensure the poll callback is set, and call it right now to push data if possible */
3785 utcp_set_poll_cb(channel->c, channel_poll);
3786 size_t left = utcp_get_rcvbuf_free(channel->c);
3789 channel_poll(channel->c, left);
3792 pthread_mutex_unlock(&mesh->mutex);
3797 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) {
3798 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3800 if(!mesh || !channel) {
3801 meshlink_errno = MESHLINK_EINVAL;
3806 meshlink_errno = MESHLINK_EINVAL;
3810 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3813 aio->cb.buffer = cb;
3816 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3820 /* Append the AIO buffer descriptor to the end of the chain */
3821 meshlink_aio_buffer_t **p = &channel->aio_receive;
3829 pthread_mutex_unlock(&mesh->mutex);
3834 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) {
3835 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3837 if(!mesh || !channel) {
3838 meshlink_errno = MESHLINK_EINVAL;
3842 if(!len || fd == -1) {
3843 meshlink_errno = MESHLINK_EINVAL;
3847 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3853 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3857 /* Append the AIO buffer descriptor to the end of the chain */
3858 meshlink_aio_buffer_t **p = &channel->aio_receive;
3866 pthread_mutex_unlock(&mesh->mutex);
3871 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3872 if(!mesh || !channel) {
3873 meshlink_errno = MESHLINK_EINVAL;
3877 return channel->c->flags;
3880 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3881 if(!mesh || !channel) {
3882 meshlink_errno = MESHLINK_EINVAL;
3886 return utcp_get_sendq(channel->c);
3889 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3890 if(!mesh || !channel) {
3891 meshlink_errno = MESHLINK_EINVAL;
3895 return utcp_get_recvq(channel->c);
3898 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3899 if(!mesh || !channel) {
3900 meshlink_errno = MESHLINK_EINVAL;
3904 return utcp_get_mss(channel->node->utcp);
3907 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3908 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout);
3910 if(!mesh || !node) {
3911 meshlink_errno = MESHLINK_EINVAL;
3915 node_t *n = (node_t *)node;
3917 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3922 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3923 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3924 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3927 utcp_set_user_timeout(n->utcp, timeout);
3929 pthread_mutex_unlock(&mesh->mutex);
3932 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3933 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3934 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3935 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3936 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3939 if(mesh->node_status_cb) {
3940 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3943 if(mesh->node_pmtu_cb) {
3944 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3948 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3949 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
3951 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3952 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3956 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3957 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3961 n->status.duplicate = true;
3962 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3965 void meshlink_hint_network_change(struct meshlink_handle *mesh) {
3966 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()");
3969 meshlink_errno = MESHLINK_EINVAL;
3973 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3977 pthread_mutex_unlock(&mesh->mutex);
3980 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3981 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout);
3983 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3984 meshlink_errno = EINVAL;
3988 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3989 meshlink_errno = EINVAL;
3993 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3997 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3998 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3999 pthread_mutex_unlock(&mesh->mutex);
4002 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
4003 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period);
4005 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4006 meshlink_errno = EINVAL;
4010 if(fast_retry_period < 0) {
4011 meshlink_errno = EINVAL;
4015 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4019 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4020 pthread_mutex_unlock(&mesh->mutex);
4023 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4024 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout);
4026 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4027 meshlink_errno = EINVAL;
4031 if(maxtimeout < 0) {
4032 meshlink_errno = EINVAL;
4036 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4040 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4041 pthread_mutex_unlock(&mesh->mutex);
4044 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4045 logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()");
4051 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4055 handle_network_change(mesh, true);
4057 pthread_mutex_unlock(&mesh->mutex);
4060 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4061 logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first);
4064 meshlink_errno = EINVAL;
4068 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4072 mesh->inviter_commits_first = inviter_commits_first;
4073 pthread_mutex_unlock(&mesh->mutex);
4076 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4077 logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity);
4079 if(!mesh || granularity < 0) {
4080 meshlink_errno = EINVAL;
4084 utcp_set_clock_granularity(granularity);
4087 void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) {
4088 logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy);
4091 meshlink_errno = EINVAL;
4095 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4099 mesh->storage_policy = policy;
4100 pthread_mutex_unlock(&mesh->mutex);
4103 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4106 if(!mesh->connections || !mesh->loop.running) {
4111 signal_trigger(&mesh->loop, &mesh->datafromapp);
4114 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4115 // We should only call the callback function if we are in the background thread.
4116 if(!mesh->error_cb) {
4120 if(!mesh->threadstarted) {
4124 if(mesh->thread == pthread_self()) {
4125 mesh->error_cb(mesh, cb_errno);
4129 static void __attribute__((constructor)) meshlink_init(void) {
4131 utcp_set_clock_granularity(10000);
4134 static void __attribute__((destructor)) meshlink_exit(void) {