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 try_bind(meshlink_handle_t *mesh, int port) {
432 struct addrinfo *ai = NULL;
433 struct addrinfo hint = {
434 .ai_flags = AI_PASSIVE,
435 .ai_family = AF_UNSPEC,
436 .ai_socktype = SOCK_STREAM,
437 .ai_protocol = IPPROTO_TCP,
441 snprintf(portstr, sizeof(portstr), "%d", port);
443 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
447 bool success = false;
449 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
450 /* Try to bind to TCP. */
452 int tcp_fd = setup_tcp_listen_socket(mesh, aip);
455 if(errno == EADDRINUSE) {
456 /* If this port is in use for any address family, avoid it. */
472 int check_port(meshlink_handle_t *mesh) {
473 for(int i = 0; i < 1000; i++) {
474 int port = 0x1000 + prng(mesh, 0x8000);
476 if(try_bind(mesh, port)) {
478 xasprintf(&mesh->myport, "%d", port);
483 meshlink_errno = MESHLINK_ENETWORK;
484 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
488 static bool write_main_config_files(meshlink_handle_t *mesh) {
489 if(!mesh->confbase) {
495 /* Write the main config file */
496 packmsg_output_t out = {buf, sizeof buf};
498 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
499 packmsg_add_str(&out, mesh->name);
500 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
501 packmsg_add_nil(&out); // Invitation keys are not supported
502 packmsg_add_uint16(&out, atoi(mesh->myport));
504 if(!packmsg_output_ok(&out)) {
508 config_t config = {buf, packmsg_output_size(&out, buf)};
510 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
514 /* Write our own host config file */
515 if(!node_write_config(mesh, mesh->self, true)) {
523 meshlink_handle_t *mesh;
525 char cookie[18 + 32];
536 static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
537 meshlink_handle_t *mesh = state->mesh;
538 packmsg_input_t in = {buf, len};
539 uint32_t version = packmsg_get_uint32(&in);
541 if(version != MESHLINK_INVITATION_VERSION) {
542 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
546 char *name = packmsg_get_str_dup(&in);
547 char *submesh_name = packmsg_get_str_dup(&in);
548 dev_class_t devclass = packmsg_get_int32(&in);
549 uint32_t count = packmsg_get_array(&in);
551 if(!name || !check_id(name)) {
552 logger(mesh, MESHLINK_DEBUG, "No valid Name found in invitation!\n");
558 if(!submesh_name || (strcmp(submesh_name, CORE_MESH) && !check_id(submesh_name))) {
559 logger(mesh, MESHLINK_DEBUG, "No valid Submesh found in invitation!\n");
566 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
573 free(mesh->self->name);
575 mesh->self->name = xstrdup(name);
576 mesh->self->submesh = strcmp(submesh_name, CORE_MESH) ? lookup_or_create_submesh(mesh, submesh_name) : NULL;
578 mesh->self->devclass = devclass == DEV_CLASS_UNKNOWN ? mesh->devclass : devclass;
580 // Initialize configuration directory
581 if(!config_init(mesh, "current")) {
585 if(!write_main_config_files(mesh)) {
589 // Write host config files
590 for(uint32_t i = 0; i < count; i++) {
592 uint32_t data_len = packmsg_get_bin_raw(&in, &data);
595 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
599 packmsg_input_t in2 = {data, data_len};
600 uint32_t version2 = packmsg_get_uint32(&in2);
601 char *name2 = packmsg_get_str_dup(&in2);
603 if(!packmsg_input_ok(&in2) || version2 != MESHLINK_CONFIG_VERSION || !check_id(name2)) {
605 packmsg_input_invalidate(&in);
609 if(!check_id(name2)) {
614 if(!strcmp(name2, mesh->name)) {
615 logger(mesh, MESHLINK_ERROR, "Secondary chunk would overwrite our own host config file.\n");
617 meshlink_errno = MESHLINK_EPEER;
621 node_t *n = new_node();
624 config_t config = {data, data_len};
626 if(!node_read_from_config(mesh, n, &config)) {
628 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
629 meshlink_errno = MESHLINK_EPEER;
634 /* The first host config file is of the inviter itself;
635 * remember the address we are currently using for the invitation connection.
638 socklen_t salen = sizeof(sa);
640 if(getpeername(state->sock, &sa.sa, &salen) == 0) {
641 node_add_recent_address(mesh, n, &sa);
645 if(!node_write_config(mesh, n, true)) {
653 /* Ensure the configuration directory metadata is on disk */
654 if(!config_sync(mesh, "current") || (mesh->confbase && !sync_path(mesh->confbase))) {
658 if(!mesh->inviter_commits_first) {
659 devtool_set_inviter_commits_first(false);
662 sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
664 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
669 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
671 join_state_t *state = handle;
672 const char *ptr = data;
675 int result = send(state->sock, ptr, len, 0);
677 if(result == -1 && errno == EINTR) {
679 } else if(result <= 0) {
690 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
691 join_state_t *state = handle;
692 meshlink_handle_t *mesh = state->mesh;
694 if(mesh->inviter_commits_first) {
696 case SPTPS_HANDSHAKE:
697 return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
703 if(!finalize_join(state, msg, len)) {
707 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
708 shutdown(state->sock, SHUT_RDWR);
709 state->success = true;
717 case SPTPS_HANDSHAKE:
718 return sptps_send_record(&state->sptps, 0, state->cookie, 18);
721 return finalize_join(state, msg, len);
724 logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
725 shutdown(state->sock, SHUT_RDWR);
726 state->success = true;
737 static bool recvline(join_state_t *state) {
738 char *newline = NULL;
740 while(!(newline = memchr(state->buffer, '\n', state->blen))) {
741 int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
743 if(result == -1 && errno == EINTR) {
745 } else if(result <= 0) {
749 state->blen += result;
752 if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
756 size_t len = newline - state->buffer;
758 memcpy(state->line, state->buffer, len);
759 state->line[len] = 0;
760 memmove(state->buffer, newline + 1, state->blen - len - 1);
761 state->blen -= len + 1;
766 static bool sendline(int fd, const char *format, ...) {
772 va_start(ap, format);
773 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
776 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
784 int result = send(fd, p, blen, MSG_NOSIGNAL);
786 if(result == -1 && errno == EINTR) {
788 } else if(result <= 0) {
799 static const char *errstr[] = {
800 [MESHLINK_OK] = "No error",
801 [MESHLINK_EINVAL] = "Invalid argument",
802 [MESHLINK_ENOMEM] = "Out of memory",
803 [MESHLINK_ENOENT] = "No such node",
804 [MESHLINK_EEXIST] = "Node already exists",
805 [MESHLINK_EINTERNAL] = "Internal error",
806 [MESHLINK_ERESOLV] = "Could not resolve hostname",
807 [MESHLINK_ESTORAGE] = "Storage error",
808 [MESHLINK_ENETWORK] = "Network error",
809 [MESHLINK_EPEER] = "Error communicating with peer",
810 [MESHLINK_ENOTSUP] = "Operation not supported",
811 [MESHLINK_EBUSY] = "MeshLink instance already in use",
812 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
815 const char *meshlink_strerror(meshlink_errno_t err) {
816 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
817 return "Invalid error code";
823 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
824 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
826 mesh->private_key = ecdsa_generate();
828 if(!mesh->private_key) {
829 logger(mesh, MESHLINK_ERROR, "Error during key generation!\n");
830 meshlink_errno = MESHLINK_EINTERNAL;
834 logger(mesh, MESHLINK_DEBUG, "Done.\n");
839 static bool timespec_lt(const struct timespec *a, const struct timespec *b) {
840 if(a->tv_sec == b->tv_sec) {
841 return a->tv_nsec < b->tv_nsec;
843 return a->tv_sec < b->tv_sec;
847 static struct timespec idle(event_loop_t *loop, void *data) {
849 meshlink_handle_t *mesh = data;
850 struct timespec t, tmin = {3600, 0};
852 for splay_each(node_t, n, mesh->nodes) {
857 t = utcp_timeout(n->utcp);
859 if(timespec_lt(&t, &tmin)) {
867 // Get our local address(es) by simulating connecting to an Internet host.
868 static void add_local_addresses(meshlink_handle_t *mesh) {
870 sa.storage.ss_family = AF_UNKNOWN;
871 socklen_t salen = sizeof(sa);
875 if(getlocaladdr("93.184.216.34", &sa, &salen, mesh->netns)) {
876 sa.in.sin_port = ntohs(atoi(mesh->myport));
877 node_add_recent_address(mesh, mesh->self, &sa);
884 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", &sa, &salen, mesh->netns)) {
885 sa.in6.sin6_port = ntohs(atoi(mesh->myport));
886 node_add_recent_address(mesh, mesh->self, &sa);
890 static bool meshlink_setup(meshlink_handle_t *mesh) {
891 if(!config_destroy(mesh->confbase, "new")) {
892 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/new: %s\n", mesh->confbase, strerror(errno));
893 meshlink_errno = MESHLINK_ESTORAGE;
897 if(!config_destroy(mesh->confbase, "old")) {
898 logger(mesh, MESHLINK_ERROR, "Could not delete configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
899 meshlink_errno = MESHLINK_ESTORAGE;
903 if(!config_init(mesh, "current")) {
904 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
905 meshlink_errno = MESHLINK_ESTORAGE;
909 if(!ecdsa_keygen(mesh)) {
910 meshlink_errno = MESHLINK_EINTERNAL;
914 if(check_port(mesh) == 0) {
915 meshlink_errno = MESHLINK_ENETWORK;
919 /* Create a node for ourself */
921 mesh->self = new_node();
922 mesh->self->name = xstrdup(mesh->name);
923 mesh->self->devclass = mesh->devclass;
924 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
925 mesh->self->session_id = mesh->session_id;
927 if(!write_main_config_files(mesh)) {
928 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
929 meshlink_errno = MESHLINK_ESTORAGE;
933 /* Ensure the configuration directory metadata is on disk */
934 if(!config_sync(mesh, "current")) {
941 static bool meshlink_read_config(meshlink_handle_t *mesh) {
944 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
945 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
949 packmsg_input_t in = {config.buf, config.len};
950 const void *private_key;
952 uint32_t version = packmsg_get_uint32(&in);
953 char *name = packmsg_get_str_dup(&in);
954 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
955 packmsg_skip_element(&in); // Invitation key is not supported
956 uint16_t myport = packmsg_get_uint16(&in);
958 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96) {
959 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
961 config_free(&config);
965 if(mesh->name && strcmp(mesh->name, name)) {
966 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
967 meshlink_errno = MESHLINK_ESTORAGE;
969 config_free(&config);
975 xasprintf(&mesh->myport, "%u", myport);
976 mesh->private_key = ecdsa_set_private_key(private_key);
977 config_free(&config);
979 /* Create a node for ourself and read our host configuration file */
981 mesh->self = new_node();
982 mesh->self->name = xstrdup(name);
983 mesh->self->devclass = mesh->devclass;
984 mesh->self->session_id = mesh->session_id;
986 if(!node_read_public_key(mesh, mesh->self)) {
987 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
988 meshlink_errno = MESHLINK_ESTORAGE;
989 free_node(mesh->self);
998 static void *setup_network_in_netns_thread(void *arg) {
999 meshlink_handle_t *mesh = arg;
1001 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1005 bool success = setup_network(mesh);
1006 return success ? arg : NULL;
1008 #endif // HAVE_SETNS
1010 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1011 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_init(%s, %s, %s, %d)", confbase, name, appname, devclass);
1013 if(!confbase || !*confbase) {
1014 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1015 meshlink_errno = MESHLINK_EINVAL;
1019 if(!appname || !*appname) {
1020 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1021 meshlink_errno = MESHLINK_EINVAL;
1025 if(strchr(appname, ' ')) {
1026 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1027 meshlink_errno = MESHLINK_EINVAL;
1031 if(name && !check_id(name)) {
1032 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1033 meshlink_errno = MESHLINK_EINVAL;
1037 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1038 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1039 meshlink_errno = MESHLINK_EINVAL;
1043 meshlink_open_params_t *params = xzalloc(sizeof * params);
1045 params->confbase = xstrdup(confbase);
1046 params->name = name ? xstrdup(name) : NULL;
1047 params->appname = xstrdup(appname);
1048 params->devclass = devclass;
1051 xasprintf(¶ms->lock_filename, "%s" SLASH "meshlink.lock", confbase);
1056 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1057 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_netnst(%d)", netns);
1060 meshlink_errno = MESHLINK_EINVAL;
1064 params->netns = netns;
1069 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1070 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_key(%p, %zu)", key, keylen);
1073 meshlink_errno = MESHLINK_EINVAL;
1077 if((!key && keylen) || (key && !keylen)) {
1078 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1079 meshlink_errno = MESHLINK_EINVAL;
1084 params->keylen = keylen;
1089 bool meshlink_open_params_set_storage_policy(meshlink_open_params_t *params, meshlink_storage_policy_t policy) {
1090 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_storage_policy(%d)", policy);
1093 meshlink_errno = MESHLINK_EINVAL;
1097 params->storage_policy = policy;
1102 bool meshlink_open_params_set_lock_filename(meshlink_open_params_t *params, const char *filename) {
1103 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_set_lock_filename(%s)", filename);
1105 if(!params || !filename) {
1106 meshlink_errno = MESHLINK_EINVAL;
1110 free(params->lock_filename);
1111 params->lock_filename = xstrdup(filename);
1116 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1117 logger(NULL, MESHLINK_DEBUG, "meshlink_encrypted_key_rotate(%p, %zu)", new_key, new_keylen);
1119 if(!mesh || !new_key || !new_keylen) {
1120 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1121 meshlink_errno = MESHLINK_EINVAL;
1125 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1129 // Create hash for the new key
1130 void *new_config_key;
1131 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1133 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1134 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1135 meshlink_errno = MESHLINK_EINTERNAL;
1136 pthread_mutex_unlock(&mesh->mutex);
1140 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1142 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1143 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1144 meshlink_errno = MESHLINK_ESTORAGE;
1145 pthread_mutex_unlock(&mesh->mutex);
1149 devtool_keyrotate_probe(1);
1151 // Rename confbase/current/ to confbase/old
1153 if(!config_rename(mesh, "current", "old")) {
1154 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1155 meshlink_errno = MESHLINK_ESTORAGE;
1156 pthread_mutex_unlock(&mesh->mutex);
1160 devtool_keyrotate_probe(2);
1162 // Rename confbase/new/ to confbase/current
1164 if(!config_rename(mesh, "new", "current")) {
1165 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1166 meshlink_errno = MESHLINK_ESTORAGE;
1167 pthread_mutex_unlock(&mesh->mutex);
1171 devtool_keyrotate_probe(3);
1173 // Cleanup the "old" confbase sub-directory
1175 if(!config_destroy(mesh->confbase, "old")) {
1176 pthread_mutex_unlock(&mesh->mutex);
1180 // Change the mesh handle key with new key
1182 free(mesh->config_key);
1183 mesh->config_key = new_config_key;
1185 pthread_mutex_unlock(&mesh->mutex);
1190 void meshlink_open_params_free(meshlink_open_params_t *params) {
1191 logger(NULL, MESHLINK_DEBUG, "meshlink_open_params_free()");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 free(params->confbase);
1200 free(params->appname);
1201 free(params->lock_filename);
1206 /// Device class traits
1207 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1208 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1209 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1210 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1211 { .pingtimeout = 5, .pinginterval = 60, .maxtimeout = 900, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1214 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1215 logger(NULL, MESHLINK_DEBUG, "meshlink_open(%s, %s, %s, %d)", confbase, name, appname, devclass);
1217 if(!confbase || !*confbase) {
1218 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1219 meshlink_errno = MESHLINK_EINVAL;
1223 char lock_filename[PATH_MAX];
1224 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1226 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1227 meshlink_open_params_t params = {
1228 .confbase = (char *)confbase,
1229 .lock_filename = lock_filename,
1230 .name = (char *)name,
1231 .appname = (char *)appname,
1232 .devclass = devclass,
1236 return meshlink_open_ex(¶ms);
1239 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) {
1240 logger(NULL, MESHLINK_DEBUG, "meshlink_open_encrypted(%s, %s, %s, %d, %p, %zu)", confbase, name, appname, devclass, key, keylen);
1242 if(!confbase || !*confbase) {
1243 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1244 meshlink_errno = MESHLINK_EINVAL;
1248 char lock_filename[PATH_MAX];
1249 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1251 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1252 meshlink_open_params_t params = {
1253 .confbase = (char *)confbase,
1254 .lock_filename = lock_filename,
1255 .name = (char *)name,
1256 .appname = (char *)appname,
1257 .devclass = devclass,
1261 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1265 return meshlink_open_ex(¶ms);
1268 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1269 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ephemeral(%s, %s, %d)", name, appname, devclass);
1272 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1273 meshlink_errno = MESHLINK_EINVAL;
1277 if(!check_id(name)) {
1278 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1279 meshlink_errno = MESHLINK_EINVAL;
1283 if(!appname || !*appname) {
1284 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1285 meshlink_errno = MESHLINK_EINVAL;
1289 if(strchr(appname, ' ')) {
1290 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1291 meshlink_errno = MESHLINK_EINVAL;
1295 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1296 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1297 meshlink_errno = MESHLINK_EINVAL;
1301 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1302 meshlink_open_params_t params = {
1303 .name = (char *)name,
1304 .appname = (char *)appname,
1305 .devclass = devclass,
1309 return meshlink_open_ex(¶ms);
1312 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1313 logger(NULL, MESHLINK_DEBUG, "meshlink_open_ex()");
1315 // Validate arguments provided by the application
1316 if(!params->appname || !*params->appname) {
1317 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1318 meshlink_errno = MESHLINK_EINVAL;
1322 if(strchr(params->appname, ' ')) {
1323 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1324 meshlink_errno = MESHLINK_EINVAL;
1328 if(params->name && !check_id(params->name)) {
1329 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1330 meshlink_errno = MESHLINK_EINVAL;
1334 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1335 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1336 meshlink_errno = MESHLINK_EINVAL;
1340 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1341 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1342 meshlink_errno = MESHLINK_EINVAL;
1346 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1348 if(params->confbase) {
1349 mesh->confbase = xstrdup(params->confbase);
1352 mesh->appname = xstrdup(params->appname);
1353 mesh->devclass = params->devclass;
1354 mesh->netns = params->netns;
1355 mesh->submeshes = NULL;
1356 mesh->log_cb = global_log_cb;
1357 mesh->log_level = global_log_level;
1358 mesh->packet = xmalloc(sizeof(vpn_packet_t));
1360 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1363 randomize(&mesh->session_id, sizeof(mesh->session_id));
1364 } while(mesh->session_id == 0);
1366 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1368 mesh->name = params->name ? xstrdup(params->name) : NULL;
1372 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1374 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1375 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1376 meshlink_close(mesh);
1377 meshlink_errno = MESHLINK_EINTERNAL;
1382 // initialize mutexes and conds
1383 pthread_mutexattr_t attr;
1384 pthread_mutexattr_init(&attr);
1386 if(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) != 0) {
1390 pthread_mutex_init(&mesh->mutex, &attr);
1391 pthread_cond_init(&mesh->cond, NULL);
1393 mesh->threadstarted = false;
1394 event_loop_init(&mesh->loop);
1395 mesh->loop.data = mesh;
1397 meshlink_queue_init(&mesh->outpacketqueue);
1399 // Atomically lock the configuration directory.
1400 if(!main_config_lock(mesh, params->lock_filename)) {
1401 meshlink_close(mesh);
1405 // If no configuration exists yet, create it.
1407 bool new_configuration = false;
1409 if(!meshlink_confbase_exists(mesh)) {
1411 logger(NULL, MESHLINK_ERROR, "No configuration files found!\n");
1412 meshlink_close(mesh);
1413 meshlink_errno = MESHLINK_ESTORAGE;
1417 if(!meshlink_setup(mesh)) {
1418 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1419 meshlink_close(mesh);
1423 new_configuration = true;
1425 if(!meshlink_read_config(mesh)) {
1426 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1427 meshlink_close(mesh);
1432 mesh->storage_policy = params->storage_policy;
1435 struct WSAData wsa_state;
1436 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1439 // Setup up everything
1440 // TODO: we should not open listening sockets yet
1442 bool success = false;
1444 if(mesh->netns != -1) {
1448 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1449 void *retval = NULL;
1450 success = pthread_join(thr, &retval) == 0 && retval;
1454 meshlink_errno = MESHLINK_EINTERNAL;
1457 #endif // HAVE_SETNS
1459 success = setup_network(mesh);
1463 meshlink_close(mesh);
1464 meshlink_errno = MESHLINK_ENETWORK;
1468 add_local_addresses(mesh);
1470 if(!node_write_config(mesh, mesh->self, new_configuration)) {
1471 logger(NULL, MESHLINK_ERROR, "Cannot update configuration\n");
1475 idle_set(&mesh->loop, idle, mesh);
1477 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1481 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1482 logger(NULL, MESHLINK_DEBUG, "meshlink_submesh_open(%s)", submesh);
1484 meshlink_submesh_t *s = NULL;
1487 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1488 meshlink_errno = MESHLINK_EINVAL;
1492 if(!submesh || !*submesh) {
1493 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1494 meshlink_errno = MESHLINK_EINVAL;
1499 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1503 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1505 pthread_mutex_unlock(&mesh->mutex);
1510 static void *meshlink_main_loop(void *arg) {
1511 meshlink_handle_t *mesh = arg;
1513 if(mesh->netns != -1) {
1516 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1517 pthread_cond_signal(&mesh->cond);
1522 pthread_cond_signal(&mesh->cond);
1524 #endif // HAVE_SETNS
1527 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1531 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1532 pthread_cond_broadcast(&mesh->cond);
1534 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1536 pthread_mutex_unlock(&mesh->mutex);
1541 bool meshlink_start(meshlink_handle_t *mesh) {
1543 meshlink_errno = MESHLINK_EINVAL;
1547 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1549 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1554 assert(mesh->private_key);
1555 assert(mesh->self->ecdsa);
1556 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1558 if(mesh->threadstarted) {
1559 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1560 pthread_mutex_unlock(&mesh->mutex);
1564 if(mesh->listen_socket[0].tcp.fd < 0) {
1565 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1566 meshlink_errno = MESHLINK_ENETWORK;
1570 // Reset node connection timers
1571 for splay_each(node_t, n, mesh->nodes) {
1572 n->last_connect_try = 0;
1575 // TODO: open listening sockets first
1577 //Check that a valid name is set
1579 logger(mesh, MESHLINK_ERROR, "No name given!\n");
1580 meshlink_errno = MESHLINK_EINVAL;
1581 pthread_mutex_unlock(&mesh->mutex);
1585 init_outgoings(mesh);
1587 // Start the main thread
1589 event_loop_start(&mesh->loop);
1591 // Ensure we have a decent amount of stack space. Musl's default of 80 kB is too small.
1592 pthread_attr_t attr;
1593 pthread_attr_init(&attr);
1594 pthread_attr_setstacksize(&attr, 1024 * 1024);
1596 if(pthread_create(&mesh->thread, &attr, meshlink_main_loop, mesh) != 0) {
1597 logger(mesh, MESHLINK_ERROR, "Could not start thread: %s\n", strerror(errno));
1598 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1599 meshlink_errno = MESHLINK_EINTERNAL;
1600 event_loop_stop(&mesh->loop);
1601 pthread_mutex_unlock(&mesh->mutex);
1605 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1606 mesh->threadstarted = true;
1608 pthread_mutex_unlock(&mesh->mutex);
1612 void meshlink_stop(meshlink_handle_t *mesh) {
1613 logger(mesh, MESHLINK_DEBUG, "meshlink_stop()\n");
1616 meshlink_errno = MESHLINK_EINVAL;
1620 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1624 // Shut down the main thread
1625 event_loop_stop(&mesh->loop);
1627 // TODO: send something to a local socket to kick the event loop
1629 if(mesh->threadstarted) {
1630 // Wait for the main thread to finish
1631 pthread_mutex_unlock(&mesh->mutex);
1633 if(pthread_join(mesh->thread, NULL) != 0) {
1637 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1641 mesh->threadstarted = false;
1644 // Close all metaconnections
1645 if(mesh->connections) {
1646 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1648 connection_t *c = node->data;
1650 terminate_connection(mesh, c, false);
1654 exit_outgoings(mesh);
1656 // Try to write out any changed node config files, ignore errors at this point.
1658 for splay_each(node_t, n, mesh->nodes) {
1659 if(n->status.dirty) {
1660 if(!node_write_config(mesh, n, false)) {
1667 pthread_mutex_unlock(&mesh->mutex);
1670 void meshlink_close(meshlink_handle_t *mesh) {
1671 logger(mesh, MESHLINK_DEBUG, "meshlink_close()\n");
1674 meshlink_errno = MESHLINK_EINVAL;
1678 // stop can be called even if mesh has not been started
1679 meshlink_stop(mesh);
1681 // lock is not released after this
1682 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1686 // Close and free all resources used.
1688 close_network_connections(mesh);
1690 logger(mesh, MESHLINK_INFO, "Terminating");
1692 event_loop_exit(&mesh->loop);
1696 if(mesh->confbase) {
1702 if(mesh->netns != -1) {
1706 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1710 meshlink_queue_exit(&mesh->outpacketqueue);
1713 free(mesh->appname);
1714 free(mesh->confbase);
1715 free(mesh->config_key);
1716 free(mesh->external_address_url);
1718 ecdsa_free(mesh->private_key);
1720 main_config_unlock(mesh);
1722 pthread_mutex_unlock(&mesh->mutex);
1723 pthread_mutex_destroy(&mesh->mutex);
1725 memset(mesh, 0, sizeof(*mesh));
1730 bool meshlink_destroy_ex(const meshlink_open_params_t *params) {
1731 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy_ex()\n");
1734 meshlink_errno = MESHLINK_EINVAL;
1738 if(!params->confbase) {
1739 /* Ephemeral instances */
1743 /* Exit early if the confbase directory itself doesn't exist */
1744 if(access(params->confbase, F_OK) && errno == ENOENT) {
1748 /* Take the lock the same way meshlink_open() would. */
1749 FILE *lockfile = fopen(params->lock_filename, "w+");
1752 logger(NULL, MESHLINK_ERROR, "Could not open lock file %s: %s", params->lock_filename, strerror(errno));
1753 meshlink_errno = MESHLINK_ESTORAGE;
1758 fcntl(fileno(lockfile), F_SETFD, FD_CLOEXEC);
1762 // TODO: use _locking()?
1765 if(flock(fileno(lockfile), LOCK_EX | LOCK_NB) != 0) {
1766 logger(NULL, MESHLINK_ERROR, "Configuration directory %s still in use\n", params->lock_filename);
1768 meshlink_errno = MESHLINK_EBUSY;
1774 if(!config_destroy(params->confbase, "current") || !config_destroy(params->confbase, "new") || !config_destroy(params->confbase, "old")) {
1775 logger(NULL, MESHLINK_ERROR, "Cannot remove sub-directories in %s: %s\n", params->confbase, strerror(errno));
1779 if(unlink(params->lock_filename)) {
1780 logger(NULL, MESHLINK_ERROR, "Cannot remove lock file %s: %s\n", params->lock_filename, strerror(errno));
1782 meshlink_errno = MESHLINK_ESTORAGE;
1788 if(!sync_path(params->confbase)) {
1789 logger(NULL, MESHLINK_ERROR, "Cannot sync directory %s: %s\n", params->confbase, strerror(errno));
1790 meshlink_errno = MESHLINK_ESTORAGE;
1797 bool meshlink_destroy(const char *confbase) {
1798 logger(NULL, MESHLINK_DEBUG, "meshlink_destroy(%s)", confbase);
1800 char lock_filename[PATH_MAX];
1801 snprintf(lock_filename, sizeof(lock_filename), "%s" SLASH "meshlink.lock", confbase);
1803 meshlink_open_params_t params = {
1804 .confbase = (char *)confbase,
1805 .lock_filename = lock_filename,
1808 return meshlink_destroy_ex(¶ms);
1811 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1812 logger(mesh, MESHLINK_DEBUG, "meshlink_set_receive_cb(%p)", (void *)(intptr_t)cb);
1815 meshlink_errno = MESHLINK_EINVAL;
1819 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1823 mesh->receive_cb = cb;
1824 pthread_mutex_unlock(&mesh->mutex);
1827 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1828 logger(mesh, MESHLINK_DEBUG, "meshlink_set_connection_try_cb(%p)", (void *)(intptr_t)cb);
1831 meshlink_errno = MESHLINK_EINVAL;
1835 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1839 mesh->connection_try_cb = cb;
1840 pthread_mutex_unlock(&mesh->mutex);
1843 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1844 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_status_cb(%p)", (void *)(intptr_t)cb);
1847 meshlink_errno = MESHLINK_EINVAL;
1851 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1855 mesh->node_status_cb = cb;
1856 pthread_mutex_unlock(&mesh->mutex);
1859 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1860 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_pmtu_cb(%p)", (void *)(intptr_t)cb);
1863 meshlink_errno = MESHLINK_EINVAL;
1867 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1871 mesh->node_pmtu_cb = cb;
1872 pthread_mutex_unlock(&mesh->mutex);
1875 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1876 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_duplicate_cb(%p)", (void *)(intptr_t)cb);
1879 meshlink_errno = MESHLINK_EINVAL;
1883 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1887 mesh->node_duplicate_cb = cb;
1888 pthread_mutex_unlock(&mesh->mutex);
1891 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1892 logger(mesh, MESHLINK_DEBUG, "meshlink_set_log_cb(%p)", (void *)(intptr_t)cb);
1895 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1900 mesh->log_level = cb ? level : 0;
1901 pthread_mutex_unlock(&mesh->mutex);
1904 global_log_level = cb ? level : 0;
1908 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1909 logger(mesh, MESHLINK_DEBUG, "meshlink_set_error_cb(%p)", (void *)(intptr_t)cb);
1912 meshlink_errno = MESHLINK_EINVAL;
1916 if(pthread_mutex_lock(&mesh->mutex) != 0) {
1920 mesh->error_cb = cb;
1921 pthread_mutex_unlock(&mesh->mutex);
1924 static bool prepare_packet(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len, vpn_packet_t *packet) {
1925 meshlink_packethdr_t *hdr;
1927 if(len > MAXSIZE - sizeof(*hdr)) {
1928 meshlink_errno = MESHLINK_EINVAL;
1932 node_t *n = (node_t *)destination;
1934 if(n->status.blacklisted) {
1935 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1936 meshlink_errno = MESHLINK_EBLACKLISTED;
1940 // Prepare the packet
1941 packet->probe = false;
1942 packet->tcp = false;
1943 packet->len = len + sizeof(*hdr);
1945 hdr = (meshlink_packethdr_t *)packet->data;
1946 memset(hdr, 0, sizeof(*hdr));
1947 // leave the last byte as 0 to make sure strings are always
1948 // null-terminated if they are longer than the buffer
1949 strncpy((char *)hdr->destination, destination->name, sizeof(hdr->destination) - 1);
1950 strncpy((char *)hdr->source, mesh->self->name, sizeof(hdr->source) - 1);
1952 memcpy(packet->data + sizeof(*hdr), data, len);
1957 static bool meshlink_send_immediate(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1959 assert(destination);
1963 // Prepare the packet
1964 if(!prepare_packet(mesh, destination, data, len, mesh->packet)) {
1968 // Send it immediately
1969 route(mesh, mesh->self, mesh->packet);
1974 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1975 logger(mesh, MESHLINK_DEBUG, "meshlink_send(%s, %p, %zu)", destination ? destination->name : "(null)", data, len);
1977 // Validate arguments
1978 if(!mesh || !destination) {
1979 meshlink_errno = MESHLINK_EINVAL;
1988 meshlink_errno = MESHLINK_EINVAL;
1992 // Prepare the packet
1993 vpn_packet_t *packet = malloc(sizeof(*packet));
1996 meshlink_errno = MESHLINK_ENOMEM;
2000 if(!prepare_packet(mesh, destination, data, len, packet)) {
2006 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
2008 meshlink_errno = MESHLINK_ENOMEM;
2012 logger(mesh, MESHLINK_DEBUG, "Adding packet of %zu bytes to packet queue", len);
2014 // Notify event loop
2015 signal_trigger(&mesh->loop, &mesh->datafromapp);
2020 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
2022 meshlink_handle_t *mesh = data;
2024 logger(mesh, MESHLINK_DEBUG, "Flushing the packet queue");
2026 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
2027 logger(mesh, MESHLINK_DEBUG, "Removing packet of %d bytes from packet queue", packet->len);
2028 mesh->self->in_packets++;
2029 mesh->self->in_bytes += packet->len;
2030 route(mesh, mesh->self, packet);
2035 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
2036 if(!mesh || !destination) {
2037 meshlink_errno = MESHLINK_EINVAL;
2041 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2045 node_t *n = (node_t *)destination;
2047 if(!n->status.reachable) {
2048 pthread_mutex_unlock(&mesh->mutex);
2051 } else if(n->mtuprobes > 30 && n->minmtu) {
2052 pthread_mutex_unlock(&mesh->mutex);
2055 pthread_mutex_unlock(&mesh->mutex);
2060 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
2061 if(!mesh || !node) {
2062 meshlink_errno = MESHLINK_EINVAL;
2066 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2070 node_t *n = (node_t *)node;
2072 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
2073 meshlink_errno = MESHLINK_EINTERNAL;
2074 pthread_mutex_unlock(&mesh->mutex);
2078 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
2081 meshlink_errno = MESHLINK_EINTERNAL;
2084 pthread_mutex_unlock(&mesh->mutex);
2088 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
2090 meshlink_errno = MESHLINK_EINVAL;
2094 return (meshlink_node_t *)mesh->self;
2097 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
2098 if(!mesh || !name) {
2099 meshlink_errno = MESHLINK_EINVAL;
2105 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2109 n = lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
2110 pthread_mutex_unlock(&mesh->mutex);
2113 meshlink_errno = MESHLINK_ENOENT;
2116 return (meshlink_node_t *)n;
2119 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
2120 if(!mesh || !name) {
2121 meshlink_errno = MESHLINK_EINVAL;
2125 meshlink_submesh_t *submesh = NULL;
2127 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2131 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
2132 pthread_mutex_unlock(&mesh->mutex);
2135 meshlink_errno = MESHLINK_ENOENT;
2141 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
2142 if(!mesh || !nmemb || (*nmemb && !nodes)) {
2143 meshlink_errno = MESHLINK_EINVAL;
2147 meshlink_node_t **result;
2150 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2154 *nmemb = mesh->nodes->count;
2155 result = realloc(nodes, *nmemb * sizeof(*nodes));
2158 meshlink_node_t **p = result;
2160 for splay_each(node_t, n, mesh->nodes) {
2161 *p++ = (meshlink_node_t *)n;
2166 meshlink_errno = MESHLINK_ENOMEM;
2169 pthread_mutex_unlock(&mesh->mutex);
2174 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) {
2175 meshlink_node_t **result;
2177 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2183 for splay_each(node_t, n, mesh->nodes) {
2184 if(search_node(n, condition)) {
2191 pthread_mutex_unlock(&mesh->mutex);
2195 result = realloc(nodes, *nmemb * sizeof(*nodes));
2198 meshlink_node_t **p = result;
2200 for splay_each(node_t, n, mesh->nodes) {
2201 if(search_node(n, condition)) {
2202 *p++ = (meshlink_node_t *)n;
2208 meshlink_errno = MESHLINK_ENOMEM;
2211 pthread_mutex_unlock(&mesh->mutex);
2216 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
2217 dev_class_t *devclass = (dev_class_t *)condition;
2219 if(*devclass == (dev_class_t)node->devclass) {
2226 static bool search_node_by_submesh(const node_t *node, const void *condition) {
2227 if(condition == node->submesh) {
2239 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) {
2240 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2241 meshlink_errno = MESHLINK_EINVAL;
2245 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2248 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2249 if(!mesh || !submesh || !nmemb) {
2250 meshlink_errno = MESHLINK_EINVAL;
2254 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2257 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2258 if(!mesh || !node) {
2259 meshlink_errno = MESHLINK_EINVAL;
2263 dev_class_t devclass;
2265 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2269 devclass = ((node_t *)node)->devclass;
2271 pthread_mutex_unlock(&mesh->mutex);
2276 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2277 if(!mesh || !node) {
2278 meshlink_errno = MESHLINK_EINVAL;
2282 node_t *n = (node_t *)node;
2284 meshlink_submesh_t *s;
2286 s = (meshlink_submesh_t *)n->submesh;
2291 bool meshlink_get_node_reachability(struct meshlink_handle *mesh, struct meshlink_node *node, time_t *last_reachable, time_t *last_unreachable) {
2292 if(!mesh || !node) {
2293 meshlink_errno = MESHLINK_EINVAL;
2297 node_t *n = (node_t *)node;
2300 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2304 reachable = n->status.reachable && !n->status.blacklisted;
2306 // TODO: handle reachable times?
2307 (void)last_reachable;
2308 (void)last_unreachable;
2310 pthread_mutex_unlock(&mesh->mutex);
2315 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2316 logger(mesh, MESHLINK_DEBUG, "meshlink_sign(%p, %zu, %p, %p)", data, len, signature, (void *)siglen);
2318 if(!mesh || !data || !len || !signature || !siglen) {
2319 meshlink_errno = MESHLINK_EINVAL;
2323 if(*siglen < MESHLINK_SIGLEN) {
2324 meshlink_errno = MESHLINK_EINVAL;
2328 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2332 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2333 meshlink_errno = MESHLINK_EINTERNAL;
2334 pthread_mutex_unlock(&mesh->mutex);
2338 *siglen = MESHLINK_SIGLEN;
2339 pthread_mutex_unlock(&mesh->mutex);
2343 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2344 logger(mesh, MESHLINK_DEBUG, "meshlink_verify(%p, %zu, %p, %zu)", data, len, signature, siglen);
2346 if(!mesh || !source || !data || !len || !signature) {
2347 meshlink_errno = MESHLINK_EINVAL;
2351 if(siglen != MESHLINK_SIGLEN) {
2352 meshlink_errno = MESHLINK_EINVAL;
2356 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2362 struct node_t *n = (struct node_t *)source;
2364 if(!node_read_public_key(mesh, n)) {
2365 meshlink_errno = MESHLINK_EINTERNAL;
2368 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2371 pthread_mutex_unlock(&mesh->mutex);
2375 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2376 logger(mesh, MESHLINK_DEBUG, "meshlink_set_canonical_address(%s, %s, %s)", node ? node->name : "(null)", address ? address : "(null)", port ? port : "(null)");
2378 if(!mesh || !node || !address) {
2379 meshlink_errno = MESHLINK_EINVAL;
2383 if(!is_valid_hostname(address)) {
2384 logger(mesh, MESHLINK_ERROR, "Invalid character in address: %s", address);
2385 meshlink_errno = MESHLINK_EINVAL;
2389 if((node_t *)node != mesh->self && !port) {
2390 logger(mesh, MESHLINK_ERROR, "Missing port number!");
2391 meshlink_errno = MESHLINK_EINVAL;
2396 if(port && !is_valid_port(port)) {
2397 logger(mesh, MESHLINK_ERROR, "Invalid character in port: %s", address);
2398 meshlink_errno = MESHLINK_EINVAL;
2402 char *canonical_address;
2404 xasprintf(&canonical_address, "%s %s", address, port ? port : mesh->myport);
2406 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2410 node_t *n = (node_t *)node;
2411 free(n->canonical_address);
2412 n->canonical_address = canonical_address;
2414 if(!node_write_config(mesh, n, false)) {
2415 pthread_mutex_unlock(&mesh->mutex);
2419 pthread_mutex_unlock(&mesh->mutex);
2421 return config_sync(mesh, "current");
2424 bool meshlink_clear_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node) {
2425 logger(mesh, MESHLINK_DEBUG, "meshlink_clear_canonical_address(%s)", node ? node->name : "(null)");
2427 if(!mesh || !node) {
2428 meshlink_errno = MESHLINK_EINVAL;
2432 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2436 node_t *n = (node_t *)node;
2437 free(n->canonical_address);
2438 n->canonical_address = NULL;
2440 if(!node_write_config(mesh, n, false)) {
2441 pthread_mutex_unlock(&mesh->mutex);
2445 pthread_mutex_unlock(&mesh->mutex);
2447 return config_sync(mesh, "current");
2450 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2451 logger(mesh, MESHLINK_DEBUG, "meshlink_add_address(%s)", address ? address : "(null)");
2453 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2456 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2457 logger(mesh, MESHLINK_DEBUG, "meshlink_add_external_address()");
2460 meshlink_errno = MESHLINK_EINVAL;
2464 char *address = meshlink_get_external_address(mesh);
2470 bool rval = meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2476 int meshlink_get_port(meshlink_handle_t *mesh) {
2478 meshlink_errno = MESHLINK_EINVAL;
2483 meshlink_errno = MESHLINK_EINTERNAL;
2489 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2493 port = atoi(mesh->myport);
2494 pthread_mutex_unlock(&mesh->mutex);
2499 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2500 logger(mesh, MESHLINK_DEBUG, "meshlink_set_port(%d)", port);
2502 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2503 meshlink_errno = MESHLINK_EINVAL;
2507 if(mesh->myport && port == atoi(mesh->myport)) {
2511 if(!try_bind(mesh, port)) {
2512 meshlink_errno = MESHLINK_ENETWORK;
2516 devtool_trybind_probe();
2520 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2524 if(mesh->threadstarted) {
2525 meshlink_errno = MESHLINK_EINVAL;
2530 xasprintf(&mesh->myport, "%d", port);
2532 /* Close down the network. This also deletes mesh->self. */
2533 close_network_connections(mesh);
2535 /* Recreate mesh->self. */
2536 mesh->self = new_node();
2537 mesh->self->name = xstrdup(mesh->name);
2538 mesh->self->devclass = mesh->devclass;
2539 mesh->self->session_id = mesh->session_id;
2540 xasprintf(&mesh->myport, "%d", port);
2542 if(!node_read_public_key(mesh, mesh->self)) {
2543 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2544 meshlink_errno = MESHLINK_ESTORAGE;
2545 free_node(mesh->self);
2548 } else if(!setup_network(mesh)) {
2549 meshlink_errno = MESHLINK_ENETWORK;
2553 /* Rebuild our own list of recent addresses */
2554 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2555 add_local_addresses(mesh);
2557 /* Write meshlink.conf with the updated port number */
2558 write_main_config_files(mesh);
2560 rval = config_sync(mesh, "current");
2563 pthread_mutex_unlock(&mesh->mutex);
2565 return rval && meshlink_get_port(mesh) == port;
2568 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2569 logger(mesh, MESHLINK_DEBUG, "meshlink_join(%s)", invitation ? invitation : "(null)");
2571 if(!mesh || !invitation) {
2572 meshlink_errno = MESHLINK_EINVAL;
2576 if(mesh->storage_policy == MESHLINK_STORAGE_DISABLED) {
2577 meshlink_errno = MESHLINK_EINVAL;
2581 join_state_t state = {
2586 ecdsa_t *key = NULL;
2587 ecdsa_t *hiskey = NULL;
2589 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2590 char copy[strlen(invitation) + 1];
2592 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2596 //Before doing meshlink_join make sure we are not connected to another mesh
2597 if(mesh->threadstarted) {
2598 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2599 meshlink_errno = MESHLINK_EINVAL;
2603 // 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.
2604 if(mesh->nodes->count > 1) {
2605 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2606 meshlink_errno = MESHLINK_EINVAL;
2610 strcpy(copy, invitation);
2612 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2614 char *slash = strchr(copy, '/');
2622 if(strlen(slash) != 48) {
2626 char *address = copy;
2629 if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
2633 if(mesh->inviter_commits_first) {
2634 memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
2637 // Generate a throw-away key for the invitation.
2638 key = ecdsa_generate();
2641 meshlink_errno = MESHLINK_EINTERNAL;
2645 char *b64key = ecdsa_get_base64_public_key(key);
2648 while(address && *address) {
2649 // We allow commas in the address part to support multiple addresses in one invitation URL.
2650 comma = strchr(address, ',');
2656 // Split of the port
2657 port = strrchr(address, ':');
2665 // IPv6 address are enclosed in brackets, per RFC 3986
2666 if(*address == '[') {
2668 char *bracket = strchr(address, ']');
2681 // Connect to the meshlink daemon mentioned in the URL.
2682 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2685 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2686 state.sock = socket_in_netns(aip->ai_family, SOCK_STREAM, IPPROTO_TCP, mesh->netns);
2688 if(state.sock == -1) {
2689 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2690 meshlink_errno = MESHLINK_ENETWORK;
2696 setsockopt(state.sock, SOL_SOCKET, SO_NOSIGPIPE, &nosigpipe, sizeof(nosigpipe));
2699 set_timeout(state.sock, 5000);
2701 if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
2702 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2703 meshlink_errno = MESHLINK_ENETWORK;
2704 closesocket(state.sock);
2714 meshlink_errno = MESHLINK_ERESOLV;
2717 if(state.sock != -1 || !comma) {
2724 if(state.sock == -1) {
2728 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2730 // Tell him we have an invitation, and give him our throw-away key.
2734 if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2735 logger(mesh, MESHLINK_ERROR, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2736 meshlink_errno = MESHLINK_ENETWORK;
2742 char hisname[4096] = "";
2743 int code, hismajor, hisminor = 0;
2745 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) {
2746 logger(mesh, MESHLINK_ERROR, "Cannot read greeting from peer\n");
2747 meshlink_errno = MESHLINK_ENETWORK;
2751 // Check if the hash of the key he gave us matches the hash in the URL.
2752 char *fingerprint = state.line + 2;
2755 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2756 logger(mesh, MESHLINK_ERROR, "Could not create hash\n%s\n", state.line + 2);
2757 meshlink_errno = MESHLINK_EINTERNAL;
2761 if(memcmp(hishash, state.hash, 18)) {
2762 logger(mesh, MESHLINK_ERROR, "Peer has an invalid key!\n%s\n", state.line + 2);
2763 meshlink_errno = MESHLINK_EPEER;
2767 hiskey = ecdsa_set_base64_public_key(fingerprint);
2770 meshlink_errno = MESHLINK_EINTERNAL;
2774 // Start an SPTPS session
2775 if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2776 meshlink_errno = MESHLINK_EINTERNAL;
2780 // Feed rest of input buffer to SPTPS
2781 if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
2782 meshlink_errno = MESHLINK_EPEER;
2787 logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
2789 while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
2791 if(errno == EINTR) {
2795 logger(mesh, MESHLINK_ERROR, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2796 meshlink_errno = MESHLINK_ENETWORK;
2800 if(!sptps_receive_data(&state.sptps, state.line, len)) {
2801 meshlink_errno = MESHLINK_EPEER;
2806 if(!state.success) {
2807 logger(mesh, MESHLINK_ERROR, "Connection closed by peer, invitation cancelled.\n");
2808 meshlink_errno = MESHLINK_EPEER;
2812 sptps_stop(&state.sptps);
2815 closesocket(state.sock);
2817 pthread_mutex_unlock(&mesh->mutex);
2821 logger(mesh, MESHLINK_ERROR, "Invalid invitation URL\n");
2822 meshlink_errno = MESHLINK_EINVAL;
2824 sptps_stop(&state.sptps);
2828 if(state.sock != -1) {
2829 closesocket(state.sock);
2832 pthread_mutex_unlock(&mesh->mutex);
2836 char *meshlink_export(meshlink_handle_t *mesh) {
2838 meshlink_errno = MESHLINK_EINVAL;
2842 // Create a config file on the fly.
2845 packmsg_output_t out = {buf, sizeof(buf)};
2846 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2847 packmsg_add_str(&out, mesh->name);
2848 packmsg_add_str(&out, CORE_MESH);
2850 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2854 packmsg_add_int32(&out, mesh->self->devclass);
2855 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2856 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2858 if(mesh->self->canonical_address && !strchr(mesh->self->canonical_address, ' ')) {
2859 char *canonical_address = NULL;
2860 xasprintf(&canonical_address, "%s %s", mesh->self->canonical_address, mesh->myport);
2861 packmsg_add_str(&out, canonical_address);
2862 free(canonical_address);
2864 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2869 for(uint32_t i = 0; i < MAX_RECENT; i++) {
2870 if(mesh->self->recent[i].sa.sa_family) {
2877 packmsg_add_array(&out, count);
2879 for(uint32_t i = 0; i < count; i++) {
2880 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2883 packmsg_add_int64(&out, 0);
2884 packmsg_add_int64(&out, 0);
2886 pthread_mutex_unlock(&mesh->mutex);
2888 if(!packmsg_output_ok(&out)) {
2889 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2890 meshlink_errno = MESHLINK_EINTERNAL;
2894 // Prepare a base64-encoded packmsg array containing our config file
2896 uint32_t len = packmsg_output_size(&out, buf);
2897 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2898 uint8_t *buf2 = xmalloc(len2);
2899 packmsg_output_t out2 = {buf2, len2};
2900 packmsg_add_array(&out2, 1);
2901 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2903 if(!packmsg_output_ok(&out2)) {
2904 logger(mesh, MESHLINK_ERROR, "Error creating export data\n");
2905 meshlink_errno = MESHLINK_EINTERNAL;
2910 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2912 return (char *)buf2;
2915 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2916 logger(mesh, MESHLINK_DEBUG, "meshlink_import(%p)", (const void *)data);
2918 if(!mesh || !data) {
2919 meshlink_errno = MESHLINK_EINVAL;
2923 size_t datalen = strlen(data);
2924 uint8_t *buf = xmalloc(datalen);
2925 int buflen = b64decode(data, buf, datalen);
2928 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2930 meshlink_errno = MESHLINK_EPEER;
2934 packmsg_input_t in = {buf, buflen};
2935 uint32_t count = packmsg_get_array(&in);
2938 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2940 meshlink_errno = MESHLINK_EPEER;
2944 if(pthread_mutex_lock(&mesh->mutex) != 0) {
2950 uint32_t len2 = packmsg_get_bin_raw(&in, &data2);
2956 packmsg_input_t in2 = {data2, len2};
2957 uint32_t version = packmsg_get_uint32(&in2);
2958 char *name = packmsg_get_str_dup(&in2);
2960 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2962 packmsg_input_invalidate(&in);
2966 if(!check_id(name)) {
2971 node_t *n = lookup_node(mesh, name);
2974 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2982 config_t config = {data2, len2};
2984 if(!node_read_from_config(mesh, n, &config)) {
2986 packmsg_input_invalidate(&in);
2990 if(!node_write_config(mesh, n, true)) {
2999 pthread_mutex_unlock(&mesh->mutex);
3003 if(!packmsg_done(&in)) {
3004 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
3005 meshlink_errno = MESHLINK_EPEER;
3009 if(!config_sync(mesh, "current")) {
3016 bool meshlink_forget_node(meshlink_handle_t *mesh, meshlink_node_t *node) {
3017 logger(mesh, MESHLINK_DEBUG, "meshlink_forget_node(%s)", node ? node->name : "(null)");
3019 if(!mesh || !node) {
3020 meshlink_errno = MESHLINK_EINVAL;
3024 node_t *n = (node_t *)node;
3026 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3030 /* Check that the node is not reachable */
3031 if(n->status.reachable || n->connection) {
3032 pthread_mutex_unlock(&mesh->mutex);
3033 logger(mesh, MESHLINK_WARNING, "Could not forget %s: still reachable", n->name);
3037 /* Check that we don't have any active UTCP connections */
3038 if(n->utcp && utcp_is_active(n->utcp)) {
3039 pthread_mutex_unlock(&mesh->mutex);
3040 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active UTCP connections", n->name);
3044 /* Check that we have no active connections to this node */
3045 for list_each(connection_t, c, mesh->connections) {
3047 pthread_mutex_unlock(&mesh->mutex);
3048 logger(mesh, MESHLINK_WARNING, "Could not forget %s: active connection", n->name);
3053 /* Remove any pending outgoings to this node */
3054 if(mesh->outgoings) {
3055 for list_each(outgoing_t, outgoing, mesh->outgoings) {
3056 if(outgoing->node == n) {
3057 list_delete_node(mesh->outgoings, list_node);
3062 /* Delete the config file for this node */
3063 if(!config_delete(mesh, "current", n->name)) {
3064 pthread_mutex_unlock(&mesh->mutex);
3068 /* Delete the node struct and any remaining edges referencing this node */
3071 pthread_mutex_unlock(&mesh->mutex);
3073 return config_sync(mesh, "current");
3076 /* Hint that a hostname may be found at an address
3077 * See header file for detailed comment.
3079 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
3080 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_address(%s, %p)", node ? node->name : "(null)", (const void *)addr);
3082 if(!mesh || !node || !addr) {
3083 meshlink_errno = EINVAL;
3087 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3091 node_t *n = (node_t *)node;
3093 if(node_add_recent_address(mesh, n, (sockaddr_t *)addr)) {
3094 if(!node_write_config(mesh, n, false)) {
3095 logger(mesh, MESHLINK_DEBUG, "Could not update %s\n", n->name);
3099 pthread_mutex_unlock(&mesh->mutex);
3100 // @TODO do we want to fire off a connection attempt right away?
3103 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
3105 node_t *n = utcp->priv;
3106 meshlink_handle_t *mesh = n->mesh;
3108 if(mesh->channel_accept_cb && mesh->channel_listen_cb) {
3109 return mesh->channel_listen_cb(mesh, (meshlink_node_t *)n, port);
3111 return mesh->channel_accept_cb;
3115 /* Finish one AIO buffer, return true if the channel is still open. */
3116 static bool aio_finish_one(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3117 meshlink_aio_buffer_t *aio = *head;
3121 channel->in_callback = true;
3124 if(aio->cb.buffer) {
3125 aio->cb.buffer(mesh, channel, aio->data, aio->done, aio->priv);
3129 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
3133 channel->in_callback = false;
3146 /* Finish all AIO buffers, return true if the channel is still open. */
3147 static bool aio_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t **head) {
3149 if(!aio_finish_one(mesh, channel, head)) {
3157 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
3158 meshlink_channel_t *channel = connection->priv;
3164 node_t *n = channel->node;
3165 meshlink_handle_t *mesh = n->mesh;
3167 if(n->status.destroyed) {
3168 meshlink_channel_close(mesh, channel);
3172 const char *p = data;
3175 while(channel->aio_receive) {
3177 /* This receive callback signalled an error, abort all outstanding AIO buffers. */
3178 if(!aio_abort(mesh, channel, &channel->aio_receive)) {
3185 meshlink_aio_buffer_t *aio = channel->aio_receive;
3186 size_t todo = aio->len - aio->done;
3193 memcpy((char *)aio->data + aio->done, p, todo);
3195 ssize_t result = write(aio->fd, p, todo);
3198 if(result < 0 && errno == EINTR) {
3202 /* Writing to fd failed, cancel just this AIO buffer. */
3203 logger(mesh, MESHLINK_ERROR, "Writing to AIO fd %d failed: %s", aio->fd, strerror(errno));
3205 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3219 if(aio->done == aio->len) {
3220 if(!aio_finish_one(mesh, channel, &channel->aio_receive)) {
3230 if(channel->receive_cb) {
3231 channel->receive_cb(mesh, channel, p, left);
3237 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
3238 node_t *n = utcp_connection->utcp->priv;
3244 meshlink_handle_t *mesh = n->mesh;
3246 if(!mesh->channel_accept_cb) {
3250 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3252 channel->c = utcp_connection;
3254 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3255 utcp_accept(utcp_connection, channel_recv, channel);
3261 static void channel_retransmit(struct utcp_connection *utcp_connection) {
3262 node_t *n = utcp_connection->utcp->priv;
3263 meshlink_handle_t *mesh = n->mesh;
3265 if(n->mtuprobes == 31 && n->mtutimeout.cb) {
3266 timeout_set(&mesh->loop, &n->mtutimeout, &(struct timespec) {
3272 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3273 node_t *n = utcp->priv;
3275 if(n->status.destroyed) {
3279 meshlink_handle_t *mesh = n->mesh;
3280 return meshlink_send_immediate(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3283 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3284 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_receive_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3286 if(!mesh || !channel) {
3287 meshlink_errno = MESHLINK_EINVAL;
3291 channel->receive_cb = cb;
3294 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3296 node_t *n = (node_t *)source;
3302 utcp_recv(n->utcp, data, len);
3305 static void channel_poll(struct utcp_connection *connection, size_t len) {
3306 meshlink_channel_t *channel = connection->priv;
3312 node_t *n = channel->node;
3313 meshlink_handle_t *mesh = n->mesh;
3315 while(channel->aio_send) {
3317 /* This poll callback signalled an error, abort all outstanding AIO buffers. */
3318 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3325 /* We have at least one AIO buffer. Send as much as possible from the buffers. */
3326 meshlink_aio_buffer_t *aio = channel->aio_send;
3327 size_t todo = aio->len - aio->done;
3335 sent = utcp_send(connection, (char *)aio->data + aio->done, todo);
3337 /* Limit the amount we read at once to avoid stack overflows */
3343 ssize_t result = read(aio->fd, buf, todo);
3347 sent = utcp_send(connection, buf, todo);
3349 if(result < 0 && errno == EINTR) {
3353 /* Reading from fd failed, cancel just this AIO buffer. */
3355 logger(mesh, MESHLINK_ERROR, "Reading from AIO fd %d failed: %s", aio->fd, strerror(errno));
3358 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3366 if(sent != (ssize_t)todo) {
3367 /* Sending failed, abort all outstanding AIO buffers and send a poll callback. */
3368 if(!aio_abort(mesh, channel, &channel->aio_send)) {
3379 /* If we didn't finish this buffer, exit early. */
3380 if(aio->done < aio->len) {
3384 /* Signal completion of this buffer, and go to the next one. */
3385 if(!aio_finish_one(mesh, channel, &channel->aio_send)) {
3394 if(channel->poll_cb) {
3395 channel->poll_cb(mesh, channel, len);
3397 utcp_set_poll_cb(connection, NULL);
3401 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3402 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_poll_cb(%p, %p)", (void *)channel, (void *)(intptr_t)cb);
3404 if(!mesh || !channel) {
3405 meshlink_errno = MESHLINK_EINVAL;
3409 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3413 channel->poll_cb = cb;
3414 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3415 pthread_mutex_unlock(&mesh->mutex);
3418 void meshlink_set_channel_listen_cb(meshlink_handle_t *mesh, meshlink_channel_listen_cb_t cb) {
3419 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_listen_cb(%p)", (void *)(intptr_t)cb);
3422 meshlink_errno = MESHLINK_EINVAL;
3426 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3430 mesh->channel_listen_cb = cb;
3432 pthread_mutex_unlock(&mesh->mutex);
3435 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3436 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_accept_cb(%p)", (void *)(intptr_t)cb);
3439 meshlink_errno = MESHLINK_EINVAL;
3443 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3447 mesh->channel_accept_cb = cb;
3448 mesh->receive_cb = channel_receive;
3450 for splay_each(node_t, n, mesh->nodes) {
3451 if(!n->utcp && n != mesh->self) {
3452 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3453 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3454 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3458 pthread_mutex_unlock(&mesh->mutex);
3461 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3462 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf(%p, %zu)", (void *)channel, size);
3464 meshlink_set_channel_sndbuf_storage(mesh, channel, NULL, size);
3467 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3468 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf(%p, %zu)", (void *)channel, size);
3470 meshlink_set_channel_rcvbuf_storage(mesh, channel, NULL, size);
3473 void meshlink_set_channel_sndbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3474 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_sndbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3476 if(!mesh || !channel) {
3477 meshlink_errno = MESHLINK_EINVAL;
3481 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3485 utcp_set_sndbuf(channel->c, buf, size);
3486 pthread_mutex_unlock(&mesh->mutex);
3489 void meshlink_set_channel_rcvbuf_storage(meshlink_handle_t *mesh, meshlink_channel_t *channel, void *buf, size_t size) {
3490 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_rcvbuf_storage(%p, %p, %zu)", (void *)channel, buf, size);
3492 if(!mesh || !channel) {
3493 meshlink_errno = MESHLINK_EINVAL;
3497 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3501 utcp_set_rcvbuf(channel->c, buf, size);
3502 pthread_mutex_unlock(&mesh->mutex);
3505 void meshlink_set_channel_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint32_t flags) {
3506 logger(mesh, MESHLINK_DEBUG, "meshlink_set_channel_flags(%p, %u)", (void *)channel, flags);
3508 if(!mesh || !channel) {
3509 meshlink_errno = MESHLINK_EINVAL;
3513 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3517 utcp_set_flags(channel->c, flags);
3518 pthread_mutex_unlock(&mesh->mutex);
3521 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) {
3522 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);
3525 abort(); // TODO: handle non-NULL data
3528 if(!mesh || !node) {
3529 meshlink_errno = MESHLINK_EINVAL;
3533 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3537 node_t *n = (node_t *)node;
3540 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3541 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3542 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3543 mesh->receive_cb = channel_receive;
3546 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3547 pthread_mutex_unlock(&mesh->mutex);
3552 if(n->status.blacklisted) {
3553 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3554 meshlink_errno = MESHLINK_EBLACKLISTED;
3555 pthread_mutex_unlock(&mesh->mutex);
3559 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3561 channel->receive_cb = cb;
3564 channel->priv = (void *)data;
3567 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3569 pthread_mutex_unlock(&mesh->mutex);
3572 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3580 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) {
3581 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_open_ex(%s, %u, %p, %p, %zu)", node ? node->name : "(null)", port, (void *)(intptr_t)cb, data, len);
3583 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3586 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3587 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_shutdown(%p, %d)", (void *)channel, direction);
3589 if(!mesh || !channel) {
3590 meshlink_errno = MESHLINK_EINVAL;
3594 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3598 utcp_shutdown(channel->c, direction);
3599 pthread_mutex_unlock(&mesh->mutex);
3602 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3603 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_close(%p)", (void *)channel);
3605 if(!mesh || !channel) {
3606 meshlink_errno = MESHLINK_EINVAL;
3610 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3615 utcp_close(channel->c);
3618 /* Clean up any outstanding AIO buffers. */
3619 aio_abort(mesh, channel, &channel->aio_send);
3620 aio_abort(mesh, channel, &channel->aio_receive);
3623 if(!channel->in_callback) {
3627 pthread_mutex_unlock(&mesh->mutex);
3630 void meshlink_channel_abort(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3631 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_abort(%p)", (void *)channel);
3633 if(!mesh || !channel) {
3634 meshlink_errno = MESHLINK_EINVAL;
3638 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3643 utcp_abort(channel->c);
3646 /* Clean up any outstanding AIO buffers. */
3647 aio_abort(mesh, channel, &channel->aio_send);
3648 aio_abort(mesh, channel, &channel->aio_receive);
3651 if(!channel->in_callback) {
3655 pthread_mutex_unlock(&mesh->mutex);
3658 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3659 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_send(%p, %p, %zu)", (void *)channel, data, len);
3661 if(!mesh || !channel) {
3662 meshlink_errno = MESHLINK_EINVAL;
3671 meshlink_errno = MESHLINK_EINVAL;
3675 // TODO: more finegrained locking.
3676 // Ideally we want to put the data into the UTCP connection's send buffer.
3677 // Then, preferably only if there is room in the receiver window,
3678 // kick the meshlink thread to go send packets.
3682 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3686 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3687 if(channel->aio_send) {
3690 retval = utcp_send(channel->c, data, len);
3693 pthread_mutex_unlock(&mesh->mutex);
3696 meshlink_errno = MESHLINK_ENETWORK;
3702 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) {
3703 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_send(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3705 if(!mesh || !channel) {
3706 meshlink_errno = MESHLINK_EINVAL;
3711 meshlink_errno = MESHLINK_EINVAL;
3715 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3718 aio->cb.buffer = cb;
3721 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3725 /* Append the AIO buffer descriptor to the end of the chain */
3726 meshlink_aio_buffer_t **p = &channel->aio_send;
3734 /* Ensure the poll callback is set, and call it right now to push data if possible */
3735 utcp_set_poll_cb(channel->c, channel_poll);
3736 size_t todo = MIN(len, utcp_get_rcvbuf_free(channel->c));
3739 channel_poll(channel->c, todo);
3742 pthread_mutex_unlock(&mesh->mutex);
3747 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) {
3748 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_send(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3750 if(!mesh || !channel) {
3751 meshlink_errno = MESHLINK_EINVAL;
3755 if(!len || fd == -1) {
3756 meshlink_errno = MESHLINK_EINVAL;
3760 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3766 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3770 /* Append the AIO buffer descriptor to the end of the chain */
3771 meshlink_aio_buffer_t **p = &channel->aio_send;
3779 /* Ensure the poll callback is set, and call it right now to push data if possible */
3780 utcp_set_poll_cb(channel->c, channel_poll);
3781 size_t left = utcp_get_rcvbuf_free(channel->c);
3784 channel_poll(channel->c, left);
3787 pthread_mutex_unlock(&mesh->mutex);
3792 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) {
3793 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_receive(%p, %p, %zu, %p, %p)", (void *)channel, data, len, (void *)(intptr_t)cb, priv);
3795 if(!mesh || !channel) {
3796 meshlink_errno = MESHLINK_EINVAL;
3801 meshlink_errno = MESHLINK_EINVAL;
3805 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3808 aio->cb.buffer = cb;
3811 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3815 /* Append the AIO buffer descriptor to the end of the chain */
3816 meshlink_aio_buffer_t **p = &channel->aio_receive;
3824 pthread_mutex_unlock(&mesh->mutex);
3829 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) {
3830 logger(mesh, MESHLINK_DEBUG, "meshlink_channel_aio_fd_receive(%p, %d, %zu, %p, %p)", (void *)channel, fd, len, (void *)(intptr_t)cb, priv);
3832 if(!mesh || !channel) {
3833 meshlink_errno = MESHLINK_EINVAL;
3837 if(!len || fd == -1) {
3838 meshlink_errno = MESHLINK_EINVAL;
3842 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3848 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3852 /* Append the AIO buffer descriptor to the end of the chain */
3853 meshlink_aio_buffer_t **p = &channel->aio_receive;
3861 pthread_mutex_unlock(&mesh->mutex);
3866 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3867 if(!mesh || !channel) {
3868 meshlink_errno = MESHLINK_EINVAL;
3872 return channel->c->flags;
3875 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3876 if(!mesh || !channel) {
3877 meshlink_errno = MESHLINK_EINVAL;
3881 return utcp_get_sendq(channel->c);
3884 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3885 if(!mesh || !channel) {
3886 meshlink_errno = MESHLINK_EINVAL;
3890 return utcp_get_recvq(channel->c);
3893 size_t meshlink_channel_get_mss(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3894 if(!mesh || !channel) {
3895 meshlink_errno = MESHLINK_EINVAL;
3899 return utcp_get_mss(channel->node->utcp);
3902 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3903 logger(mesh, MESHLINK_DEBUG, "meshlink_set_node_channel_timeout(%s, %d)", node ? node->name : "(null)", timeout);
3905 if(!mesh || !node) {
3906 meshlink_errno = MESHLINK_EINVAL;
3910 node_t *n = (node_t *)node;
3912 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3917 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3918 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3919 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3922 utcp_set_user_timeout(n->utcp, timeout);
3924 pthread_mutex_unlock(&mesh->mutex);
3927 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3928 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3929 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3930 utcp_set_mtu(n->utcp, n->mtu - sizeof(meshlink_packethdr_t));
3931 utcp_set_retransmit_cb(n->utcp, channel_retransmit);
3934 if(mesh->node_status_cb) {
3935 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3938 if(mesh->node_pmtu_cb) {
3939 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3943 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3944 utcp_set_mtu(n->utcp, (n->minmtu > MINMTU ? n->minmtu : MINMTU) - sizeof(meshlink_packethdr_t));
3946 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3947 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3951 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3952 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3956 n->status.duplicate = true;
3957 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3960 void meshlink_hint_network_change(struct meshlink_handle *mesh) {
3961 logger(mesh, MESHLINK_DEBUG, "meshlink_hint_network_change()");
3964 meshlink_errno = MESHLINK_EINVAL;
3968 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3972 pthread_mutex_unlock(&mesh->mutex);
3975 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3976 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_timeouts(%d, %d, %d)", devclass, pinginterval, pingtimeout);
3978 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3979 meshlink_errno = EINVAL;
3983 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3984 meshlink_errno = EINVAL;
3988 if(pthread_mutex_lock(&mesh->mutex) != 0) {
3992 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3993 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3994 pthread_mutex_unlock(&mesh->mutex);
3997 void meshlink_set_dev_class_fast_retry_period(meshlink_handle_t *mesh, dev_class_t devclass, int fast_retry_period) {
3998 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_retry_period(%d, %d)", devclass, fast_retry_period);
4000 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4001 meshlink_errno = EINVAL;
4005 if(fast_retry_period < 0) {
4006 meshlink_errno = EINVAL;
4010 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4014 mesh->dev_class_traits[devclass].fast_retry_period = fast_retry_period;
4015 pthread_mutex_unlock(&mesh->mutex);
4018 void meshlink_set_dev_class_maxtimeout(struct meshlink_handle *mesh, dev_class_t devclass, int maxtimeout) {
4019 logger(mesh, MESHLINK_DEBUG, "meshlink_set_dev_class_fast_maxtimeout(%d, %d)", devclass, maxtimeout);
4021 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
4022 meshlink_errno = EINVAL;
4026 if(maxtimeout < 0) {
4027 meshlink_errno = EINVAL;
4031 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4035 mesh->dev_class_traits[devclass].maxtimeout = maxtimeout;
4036 pthread_mutex_unlock(&mesh->mutex);
4039 void meshlink_reset_timers(struct meshlink_handle *mesh) {
4040 logger(mesh, MESHLINK_DEBUG, "meshlink_reset_timers()");
4046 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4050 handle_network_change(mesh, true);
4052 pthread_mutex_unlock(&mesh->mutex);
4055 void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
4056 logger(mesh, MESHLINK_DEBUG, "meshlink_set_inviter_commits_first(%d)", inviter_commits_first);
4059 meshlink_errno = EINVAL;
4063 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4067 mesh->inviter_commits_first = inviter_commits_first;
4068 pthread_mutex_unlock(&mesh->mutex);
4071 void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity) {
4072 logger(mesh, MESHLINK_DEBUG, "meshlink_set_scheduling_granularity(%ld)", granularity);
4074 if(!mesh || granularity < 0) {
4075 meshlink_errno = EINVAL;
4079 utcp_set_clock_granularity(granularity);
4082 void meshlink_set_storage_policy(struct meshlink_handle *mesh, meshlink_storage_policy_t policy) {
4083 logger(mesh, MESHLINK_DEBUG, "meshlink_set_storage_policy(%d)", policy);
4086 meshlink_errno = EINVAL;
4090 if(pthread_mutex_lock(&mesh->mutex) != 0) {
4094 mesh->storage_policy = policy;
4095 pthread_mutex_unlock(&mesh->mutex);
4098 void handle_network_change(meshlink_handle_t *mesh, bool online) {
4101 if(!mesh->connections || !mesh->loop.running) {
4106 signal_trigger(&mesh->loop, &mesh->datafromapp);
4109 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t cb_errno) {
4110 // We should only call the callback function if we are in the background thread.
4111 if(!mesh->error_cb) {
4115 if(!mesh->threadstarted) {
4119 if(mesh->thread == pthread_self()) {
4120 mesh->error_cb(mesh, cb_errno);
4124 static void __attribute__((constructor)) meshlink_init(void) {
4126 utcp_set_clock_granularity(10000);
4129 static void __attribute__((destructor)) meshlink_exit(void) {