2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.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 void get_canonical_address(node_t *n, char **hostname, char **port) {
61 if(!n->canonical_address) {
65 *hostname = xstrdup(n->canonical_address);
66 char *space = strchr(*hostname, ' ');
70 *port = xstrdup(space);
74 static bool is_valid_hostname(const char *hostname) {
79 for(const char *p = hostname; *p; p++) {
80 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
88 static bool is_valid_port(const char *port) {
95 unsigned long int result = strtoul(port, &end, 10);
96 return result && result < 65536 && !*end;
99 for(const char *p = port; *p; p++) {
100 if(!(isalnum(*p) || *p == '-')) {
108 static void set_timeout(int sock, int timeout) {
113 tv.tv_sec = timeout / 1000;
114 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
116 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
117 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
120 struct socket_in_netns_params {
129 static void *socket_in_netns_thread(void *arg) {
130 struct socket_in_netns_params *params = arg;
132 if(setns(params->netns, CLONE_NEWNET) == -1) {
133 meshlink_errno = MESHLINK_EINVAL;
137 params->fd = socket(params->domain, params->type, params->protocol);
143 static int socket_in_netns(int domain, int type, int protocol, int netns) {
145 return socket(domain, type, protocol);
149 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
153 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
154 pthread_join(thr, NULL);
164 // Find out what local address a socket would use if we connect to the given address.
165 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
166 // of both endpoints, but this will actually not send any UDP packet.
167 static bool getlocaladdr(char *destaddr, struct sockaddr *sn, socklen_t *sl, int netns) {
168 struct addrinfo *rai = NULL;
169 const struct addrinfo hint = {
170 .ai_family = AF_UNSPEC,
171 .ai_socktype = SOCK_DGRAM,
172 .ai_protocol = IPPROTO_UDP,
175 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
179 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
186 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
194 if(getsockname(sock, sn, sl)) {
203 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
204 struct sockaddr_storage sn;
205 socklen_t sl = sizeof(sn);
207 if(!getlocaladdr(destaddr, (struct sockaddr *)&sn, &sl, netns)) {
211 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
218 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
219 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
222 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
223 char *hostname = NULL;
225 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
226 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
227 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
230 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
231 if(family != AF_UNSPEC && aip->ai_family != family) {
235 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
238 set_timeout(s, 5000);
240 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
247 send(s, request, sizeof(request) - 1, 0);
248 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
253 if(line[len - 1] == '\n') {
257 char *p = strrchr(line, '\n');
260 hostname = xstrdup(p + 1);
276 // Check that the hostname is reasonable
277 if(hostname && !is_valid_hostname(hostname)) {
283 meshlink_errno = MESHLINK_ERESOLV;
289 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
292 // Determine address of the local interface used for outgoing connections.
293 char localaddr[NI_MAXHOST];
294 bool success = false;
296 if(family == AF_INET) {
297 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
298 } else if(family == AF_INET6) {
299 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
303 meshlink_errno = MESHLINK_ENETWORK;
307 return xstrdup(localaddr);
310 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
311 for(int i = 0; i < n; i++) {
316 // Ignore duplicate hostnames
319 for(int j = 0; j < i; j++) {
324 if(strcmp(host[i], host[j])) {
328 if(strcmp(port[i], port[j])) {
346 // This gets the hostname part for use in invitation URLs
347 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
348 char *hostname[4] = {NULL};
349 char *port[4] = {NULL};
350 char *hostport = NULL;
352 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
353 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
356 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
357 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
360 // Add local addresses if requested
361 if(flags & MESHLINK_INVITE_LOCAL) {
362 if(flags & MESHLINK_INVITE_IPV4) {
363 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
366 if(flags & MESHLINK_INVITE_IPV6) {
367 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
371 // Add public/canonical addresses if requested
372 if(flags & MESHLINK_INVITE_PUBLIC) {
373 // Try the CanonicalAddress first
374 get_canonical_address(mesh->self, &hostname[2], &port[2]);
377 if(flags & MESHLINK_INVITE_IPV4) {
378 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
381 if(flags & MESHLINK_INVITE_IPV6) {
382 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
387 for(int i = 0; i < 4; i++) {
388 // Ensure we always have a port number
389 if(hostname[i] && !port[i]) {
390 port[i] = xstrdup(mesh->myport);
394 remove_duplicate_hostnames(hostname, port, 4);
396 if(!(flags & MESHLINK_INVITE_NUMERIC)) {
397 for(int i = 0; i < 4; i++) {
402 // Convert what we have to a sockaddr
403 struct addrinfo *ai_in, *ai_out;
404 struct addrinfo hint = {
405 .ai_family = AF_UNSPEC,
406 .ai_flags = AI_NUMERICSERV,
407 .ai_socktype = SOCK_STREAM,
409 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
415 // Convert it to a hostname
416 char resolved_host[NI_MAXHOST];
417 char resolved_port[NI_MAXSERV];
418 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
425 // Convert the hostname back to a sockaddr
426 hint.ai_family = ai_in->ai_family;
427 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
434 // Check if it's still the same sockaddr
435 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
437 freeaddrinfo(ai_out);
441 // Yes: replace the hostname with the resolved one
443 hostname[i] = xstrdup(resolved_host);
446 freeaddrinfo(ai_out);
450 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
451 remove_duplicate_hostnames(hostname, port, 4);
453 // Concatenate all unique address to the hostport string
454 for(int i = 0; i < 4; i++) {
459 // Ensure we have the same addresses in our own host config file.
461 xasprintf(&tmphostport, "%s %s", hostname[i], port[i]);
463 //config_add_string(&mesh->config, "Address", tmphostport);
466 // Append the address to the hostport string
468 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
470 hostport = newhostport;
479 static bool try_bind(int port) {
480 struct addrinfo *ai = NULL;
481 struct addrinfo hint = {
482 .ai_flags = AI_PASSIVE,
483 .ai_family = AF_UNSPEC,
484 .ai_socktype = SOCK_STREAM,
485 .ai_protocol = IPPROTO_TCP,
489 snprintf(portstr, sizeof(portstr), "%d", port);
491 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
496 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
497 int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
504 int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
517 int check_port(meshlink_handle_t *mesh) {
518 for(int i = 0; i < 1000; i++) {
519 int port = 0x1000 + (rand() & 0x7fff);
523 xasprintf(&mesh->myport, "%d", port);
528 meshlink_errno = MESHLINK_ENETWORK;
529 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
533 static bool write_main_config_files(meshlink_handle_t *mesh) {
534 if(!mesh->confbase) {
540 /* Write the main config file */
541 packmsg_output_t out = {buf, sizeof buf};
543 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
544 packmsg_add_str(&out, mesh->name);
545 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
546 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
547 packmsg_add_uint16(&out, atoi(mesh->myport));
549 if(!packmsg_output_ok(&out)) {
553 config_t config = {buf, packmsg_output_size(&out, buf)};
555 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
559 /* Write our own host config file */
560 if(!node_write_config(mesh, mesh->self)) {
567 static bool finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
568 packmsg_input_t in = {buf, len};
569 uint32_t version = packmsg_get_uint32(&in);
571 if(version != MESHLINK_INVITATION_VERSION) {
572 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
576 char *name = packmsg_get_str_dup(&in);
577 packmsg_skip_element(&in); /* submesh */
578 int32_t devclass = packmsg_get_int32(&in);
579 uint32_t count = packmsg_get_array(&in);
582 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
586 if(!check_id(name)) {
587 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
593 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
599 free(mesh->self->name);
601 mesh->self->name = xstrdup(name);
602 mesh->self->devclass = devclass;
604 // Initialize configuration directory
605 if(!config_init(mesh, "current")) {
609 if(!write_main_config_files(mesh)) {
613 // Write host config files
616 uint32_t len = packmsg_get_bin_raw(&in, &data);
619 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
623 packmsg_input_t in2 = {data, len};
624 uint32_t version = packmsg_get_uint32(&in2);
625 char *name = packmsg_get_str_dup(&in2);
627 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
629 packmsg_input_invalidate(&in);
633 if(!check_id(name)) {
638 if(!strcmp(name, mesh->name)) {
639 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
641 meshlink_errno = MESHLINK_EPEER;
645 node_t *n = new_node();
648 config_t config = {data, len};
650 if(!node_read_from_config(mesh, n, &config)) {
652 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
653 meshlink_errno = MESHLINK_EPEER;
659 if(!config_write(mesh, "current", n->name, &config, mesh->config_key)) {
664 sptps_send_record(&(mesh->sptps), 1, ecdsa_get_public_key(mesh->private_key), 32);
666 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
671 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
673 meshlink_handle_t *mesh = handle;
674 const char *ptr = data;
677 int result = send(mesh->sock, ptr, len, 0);
679 if(result == -1 && errno == EINTR) {
681 } else if(result <= 0) {
692 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
693 meshlink_handle_t *mesh = handle;
696 case SPTPS_HANDSHAKE:
697 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
700 return finalize_join(mesh, msg, len);
703 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
704 shutdown(mesh->sock, SHUT_RDWR);
705 mesh->success = true;
715 static bool recvline(meshlink_handle_t *mesh, size_t len) {
716 char *newline = NULL;
722 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
723 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
725 if(result == -1 && errno == EINTR) {
727 } else if(result <= 0) {
731 mesh->blen += result;
734 if((size_t)(newline - mesh->buffer) >= len) {
738 len = newline - mesh->buffer;
740 memcpy(mesh->line, mesh->buffer, len);
742 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
743 mesh->blen -= len + 1;
747 static bool sendline(int fd, char *format, ...) {
748 static char buffer[4096];
753 va_start(ap, format);
754 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
757 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
765 int result = send(fd, p, blen, MSG_NOSIGNAL);
767 if(result == -1 && errno == EINTR) {
769 } else if(result <= 0) {
780 static const char *errstr[] = {
781 [MESHLINK_OK] = "No error",
782 [MESHLINK_EINVAL] = "Invalid argument",
783 [MESHLINK_ENOMEM] = "Out of memory",
784 [MESHLINK_ENOENT] = "No such node",
785 [MESHLINK_EEXIST] = "Node already exists",
786 [MESHLINK_EINTERNAL] = "Internal error",
787 [MESHLINK_ERESOLV] = "Could not resolve hostname",
788 [MESHLINK_ESTORAGE] = "Storage error",
789 [MESHLINK_ENETWORK] = "Network error",
790 [MESHLINK_EPEER] = "Error communicating with peer",
791 [MESHLINK_ENOTSUP] = "Operation not supported",
792 [MESHLINK_EBUSY] = "MeshLink instance already in use",
795 const char *meshlink_strerror(meshlink_errno_t err) {
796 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
797 return "Invalid error code";
803 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
804 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
806 mesh->private_key = ecdsa_generate();
807 mesh->invitation_key = ecdsa_generate();
809 if(!mesh->private_key || !mesh->invitation_key) {
810 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
811 meshlink_errno = MESHLINK_EINTERNAL;
815 logger(mesh, MESHLINK_DEBUG, "Done.\n");
820 static struct timeval idle(event_loop_t *loop, void *data) {
822 meshlink_handle_t *mesh = data;
823 struct timeval t, tmin = {3600, 0};
825 for splay_each(node_t, n, mesh->nodes) {
830 t = utcp_timeout(n->utcp);
832 if(timercmp(&t, &tmin, <)) {
840 // Get our local address(es) by simulating connecting to an Internet host.
841 static void add_local_addresses(meshlink_handle_t *mesh) {
842 struct sockaddr_storage sn;
843 socklen_t sl = sizeof(sn);
847 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
848 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
849 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
856 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
857 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
858 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
862 static bool meshlink_setup(meshlink_handle_t *mesh) {
863 if(!config_init(mesh, "current")) {
864 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
865 meshlink_errno = MESHLINK_ESTORAGE;
869 if(!ecdsa_keygen(mesh)) {
870 meshlink_errno = MESHLINK_EINTERNAL;
874 if(check_port(mesh) == 0) {
875 meshlink_errno = MESHLINK_ENETWORK;
879 /* Create a node for ourself */
881 mesh->self = new_node();
882 mesh->self->name = xstrdup(mesh->name);
883 mesh->self->devclass = mesh->devclass;
884 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
886 if(!write_main_config_files(mesh)) {
887 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
888 meshlink_errno = MESHLINK_ESTORAGE;
892 if(!main_config_lock(mesh)) {
893 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
894 meshlink_errno = MESHLINK_ESTORAGE;
901 static bool meshlink_read_config(meshlink_handle_t *mesh) {
902 // Open the configuration file and lock it
903 if(!main_config_lock(mesh)) {
904 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
905 meshlink_errno = MESHLINK_ESTORAGE;
911 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
912 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
916 packmsg_input_t in = {config.buf, config.len};
917 const void *private_key;
918 const void *invitation_key;
920 uint32_t version = packmsg_get_uint32(&in);
921 char *name = packmsg_get_str_dup(&in);
922 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
923 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
924 uint16_t myport = packmsg_get_uint16(&in);
926 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
927 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
929 config_free(&config);
936 if(mesh->name && strcmp(mesh->name, name)) {
937 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
938 meshlink_errno = MESHLINK_ESTORAGE;
940 config_free(&config);
948 xasprintf(&mesh->myport, "%u", myport);
949 mesh->private_key = ecdsa_set_private_key(private_key);
950 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
951 config_free(&config);
953 /* Create a node for ourself and read our host configuration file */
955 mesh->self = new_node();
956 mesh->self->name = xstrdup(name);
957 mesh->self->devclass = mesh->devclass;
959 if(!node_read_public_key(mesh, mesh->self)) {
960 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
961 meshlink_errno = MESHLINK_ESTORAGE;
962 free_node(mesh->self);
971 static void *setup_network_in_netns_thread(void *arg) {
972 meshlink_handle_t *mesh = arg;
974 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
978 bool success = setup_network(mesh);
979 add_local_addresses(mesh);
980 return success ? arg : NULL;
984 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
985 if(!confbase || !*confbase) {
986 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
987 meshlink_errno = MESHLINK_EINVAL;
991 if(!appname || !*appname) {
992 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
993 meshlink_errno = MESHLINK_EINVAL;
997 if(strchr(appname, ' ')) {
998 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
999 meshlink_errno = MESHLINK_EINVAL;
1003 if(!name || !*name) {
1004 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1006 } else { //check name only if there is a name != NULL
1007 if(!check_id(name)) {
1008 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1009 meshlink_errno = MESHLINK_EINVAL;
1014 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1015 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1016 meshlink_errno = MESHLINK_EINVAL;
1020 meshlink_open_params_t *params = xzalloc(sizeof * params);
1022 params->confbase = xstrdup(confbase);
1023 params->name = xstrdup(name);
1024 params->appname = xstrdup(appname);
1025 params->devclass = devclass;
1031 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1033 meshlink_errno = MESHLINK_EINVAL;
1037 params->netns = netns;
1042 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1044 meshlink_errno = MESHLINK_EINVAL;
1048 if((!key && keylen) || (key && !keylen)) {
1049 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1050 meshlink_errno = MESHLINK_EINVAL;
1055 params->keylen = keylen;
1060 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1062 // While copying old config files to new config files
1063 devtool_keyrotate_probe(1);
1064 // After completed creating new config files in confbase/new/
1065 devtool_keyrotate_probe(2);
1066 // Rename confbase/current to confbase/old/
1067 devtool_keyrotate_probe(3);
1068 // Rename confbase/new/ to confbase/current
1069 devtool_keyrotate_probe(4);
1070 // Before deleting old sub-directory
1071 devtool_keyrotate_probe(5);
1076 void meshlink_open_params_free(meshlink_open_params_t *params) {
1078 meshlink_errno = MESHLINK_EINVAL;
1082 free(params->confbase);
1084 free(params->appname);
1089 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1090 if(!confbase || !*confbase) {
1091 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1092 meshlink_errno = MESHLINK_EINVAL;
1096 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1097 meshlink_open_params_t params;
1098 memset(¶ms, 0, sizeof(params));
1100 params.confbase = (char *)confbase;
1101 params.name = (char *)name;
1102 params.appname = (char *)appname;
1103 params.devclass = devclass;
1106 return meshlink_open_ex(¶ms);
1109 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) {
1110 if(!confbase || !*confbase) {
1111 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1112 meshlink_errno = MESHLINK_EINVAL;
1116 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1117 meshlink_open_params_t params = {NULL};
1119 params.confbase = (char *)confbase;
1120 params.name = (char *)name;
1121 params.appname = (char *)appname;
1122 params.devclass = devclass;
1125 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1129 return meshlink_open_ex(¶ms);
1132 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1133 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1134 meshlink_open_params_t params = {NULL};
1136 params.name = (char *)name;
1137 params.appname = (char *)appname;
1138 params.devclass = devclass;
1141 return meshlink_open_ex(¶ms);
1144 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1145 // Validate arguments provided by the application
1146 bool usingname = false;
1148 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1150 if(!params->appname || !*params->appname) {
1151 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1152 meshlink_errno = MESHLINK_EINVAL;
1156 if(strchr(params->appname, ' ')) {
1157 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1158 meshlink_errno = MESHLINK_EINVAL;
1162 if(!params->name || !*params->name) {
1163 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1165 } else { //check name only if there is a name != NULL
1167 if(!check_id(params->name)) {
1168 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1169 meshlink_errno = MESHLINK_EINVAL;
1176 if((int)params->devclass < 0 || params->devclass > _DEV_CLASS_MAX) {
1177 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1178 meshlink_errno = MESHLINK_EINVAL;
1182 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1183 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1184 meshlink_errno = MESHLINK_EINVAL;
1188 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1190 if(params->confbase) {
1191 mesh->confbase = xstrdup(params->confbase);
1194 mesh->appname = xstrdup(params->appname);
1195 mesh->devclass = params->devclass;
1196 mesh->discovery = true;
1197 mesh->invitation_timeout = 604800; // 1 week
1198 mesh->netns = params->netns;
1199 mesh->submeshes = NULL;
1202 mesh->name = xstrdup(params->name);
1207 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1209 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1210 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1211 meshlink_close(mesh);
1212 meshlink_errno = MESHLINK_EINTERNAL;
1218 pthread_mutexattr_t attr;
1219 pthread_mutexattr_init(&attr);
1220 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1221 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1223 mesh->threadstarted = false;
1224 event_loop_init(&mesh->loop);
1225 mesh->loop.data = mesh;
1227 meshlink_queue_init(&mesh->outpacketqueue);
1229 // If no configuration exists yet, create it.
1231 if(!meshlink_confbase_exists(mesh)) {
1232 if(!meshlink_setup(mesh)) {
1233 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1234 meshlink_close(mesh);
1238 if(!meshlink_read_config(mesh)) {
1239 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1240 meshlink_close(mesh);
1246 struct WSAData wsa_state;
1247 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1250 // Setup up everything
1251 // TODO: we should not open listening sockets yet
1253 bool success = false;
1255 if(mesh->netns != -1) {
1259 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1260 void *retval = NULL;
1261 success = pthread_join(thr, &retval) == 0 && retval;
1265 meshlink_errno = MESHLINK_EINTERNAL;
1268 #endif // HAVE_SETNS
1270 success = setup_network(mesh);
1271 add_local_addresses(mesh);
1275 meshlink_close(mesh);
1276 meshlink_errno = MESHLINK_ENETWORK;
1280 add_local_addresses(mesh);
1281 node_write_config(mesh, mesh->self);
1283 idle_set(&mesh->loop, idle, mesh);
1285 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1289 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1290 meshlink_submesh_t *s = NULL;
1293 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1294 meshlink_errno = MESHLINK_EINVAL;
1298 if(!submesh || !*submesh) {
1299 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1300 meshlink_errno = MESHLINK_EINVAL;
1305 pthread_mutex_lock(&(mesh->mesh_mutex));
1307 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1309 pthread_mutex_unlock(&(mesh->mesh_mutex));
1314 static void *meshlink_main_loop(void *arg) {
1315 meshlink_handle_t *mesh = arg;
1317 if(mesh->netns != -1) {
1320 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1326 #endif // HAVE_SETNS
1329 pthread_mutex_lock(&(mesh->mesh_mutex));
1331 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1333 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1335 pthread_mutex_unlock(&(mesh->mesh_mutex));
1339 bool meshlink_start(meshlink_handle_t *mesh) {
1341 assert(mesh->private_key);
1344 meshlink_errno = MESHLINK_EINVAL;
1348 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1350 pthread_mutex_lock(&(mesh->mesh_mutex));
1352 if(mesh->threadstarted) {
1353 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1354 pthread_mutex_unlock(&(mesh->mesh_mutex));
1358 if(mesh->listen_socket[0].tcp.fd < 0) {
1359 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1360 meshlink_errno = MESHLINK_ENETWORK;
1364 mesh->thedatalen = 0;
1366 // TODO: open listening sockets first
1368 //Check that a valid name is set
1370 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1371 meshlink_errno = MESHLINK_EINVAL;
1372 pthread_mutex_unlock(&(mesh->mesh_mutex));
1376 init_outgoings(mesh);
1378 // Start the main thread
1380 event_loop_start(&mesh->loop);
1382 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1383 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1384 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1385 meshlink_errno = MESHLINK_EINTERNAL;
1386 event_loop_stop(&mesh->loop);
1387 pthread_mutex_unlock(&(mesh->mesh_mutex));
1391 mesh->threadstarted = true;
1395 if(mesh->discovery) {
1396 discovery_start(mesh);
1401 assert(mesh->self->ecdsa);
1402 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1405 pthread_mutex_unlock(&(mesh->mesh_mutex));
1409 void meshlink_stop(meshlink_handle_t *mesh) {
1411 meshlink_errno = MESHLINK_EINVAL;
1415 pthread_mutex_lock(&(mesh->mesh_mutex));
1416 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1421 if(mesh->discovery) {
1422 discovery_stop(mesh);
1427 // Shut down the main thread
1428 event_loop_stop(&mesh->loop);
1430 // Send ourselves a UDP packet to kick the event loop
1431 for(int i = 0; i < mesh->listen_sockets; i++) {
1433 socklen_t salen = sizeof(sa.sa);
1435 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1436 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1440 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1441 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1445 if(mesh->threadstarted) {
1446 // Wait for the main thread to finish
1447 pthread_mutex_unlock(&(mesh->mesh_mutex));
1448 pthread_join(mesh->thread, NULL);
1449 pthread_mutex_lock(&(mesh->mesh_mutex));
1451 mesh->threadstarted = false;
1454 // Close all metaconnections
1455 if(mesh->connections) {
1456 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1458 connection_t *c = node->data;
1460 terminate_connection(mesh, c, false);
1464 exit_outgoings(mesh);
1466 // Write out any changed node config files
1468 for splay_each(node_t, n, mesh->nodes) {
1469 if(n->status.dirty) {
1470 node_write_config(mesh, n);
1471 n->status.dirty = false;
1476 pthread_mutex_unlock(&(mesh->mesh_mutex));
1479 void meshlink_close(meshlink_handle_t *mesh) {
1481 meshlink_errno = MESHLINK_EINVAL;
1485 // stop can be called even if mesh has not been started
1486 meshlink_stop(mesh);
1488 // lock is not released after this
1489 pthread_mutex_lock(&(mesh->mesh_mutex));
1491 // Close and free all resources used.
1493 close_network_connections(mesh);
1495 logger(mesh, MESHLINK_INFO, "Terminating");
1497 event_loop_exit(&mesh->loop);
1501 if(mesh->confbase) {
1507 ecdsa_free(mesh->invitation_key);
1509 if(mesh->netns != -1) {
1514 free(mesh->appname);
1515 free(mesh->confbase);
1516 free(mesh->config_key);
1517 ecdsa_free(mesh->private_key);
1518 pthread_mutex_destroy(&(mesh->mesh_mutex));
1520 main_config_unlock(mesh);
1522 memset(mesh, 0, sizeof(*mesh));
1527 bool meshlink_destroy(const char *confbase) {
1529 meshlink_errno = MESHLINK_EINVAL;
1533 if(!config_destroy(confbase, "current")) {
1534 logger(NULL, MESHLINK_ERROR, "Cannot remove confbase sub-directories %s: %s\n", confbase, strerror(errno));
1538 config_destroy(confbase, "new");
1539 config_destroy(confbase, "old");
1541 if(rmdir(confbase) && errno != ENOENT) {
1542 logger(NULL, MESHLINK_ERROR, "Cannot remove directory %s: %s\n", confbase, strerror(errno));
1543 meshlink_errno = MESHLINK_ESTORAGE;
1550 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1552 meshlink_errno = MESHLINK_EINVAL;
1556 pthread_mutex_lock(&(mesh->mesh_mutex));
1557 mesh->receive_cb = cb;
1558 pthread_mutex_unlock(&(mesh->mesh_mutex));
1561 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1563 meshlink_errno = MESHLINK_EINVAL;
1567 pthread_mutex_lock(&(mesh->mesh_mutex));
1568 mesh->connection_try_cb = cb;
1569 pthread_mutex_unlock(&(mesh->mesh_mutex));
1572 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1574 meshlink_errno = MESHLINK_EINVAL;
1578 pthread_mutex_lock(&(mesh->mesh_mutex));
1579 mesh->node_status_cb = cb;
1580 pthread_mutex_unlock(&(mesh->mesh_mutex));
1583 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1585 meshlink_errno = MESHLINK_EINVAL;
1589 pthread_mutex_lock(&(mesh->mesh_mutex));
1590 mesh->node_duplicate_cb = cb;
1591 pthread_mutex_unlock(&(mesh->mesh_mutex));
1594 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1596 pthread_mutex_lock(&(mesh->mesh_mutex));
1598 mesh->log_level = cb ? level : 0;
1599 pthread_mutex_unlock(&(mesh->mesh_mutex));
1602 global_log_level = cb ? level : 0;
1606 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1607 meshlink_packethdr_t *hdr;
1609 // Validate arguments
1610 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1611 meshlink_errno = MESHLINK_EINVAL;
1620 meshlink_errno = MESHLINK_EINVAL;
1624 node_t *n = (node_t *)destination;
1626 if(n->status.blacklisted) {
1627 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1631 // Prepare the packet
1632 vpn_packet_t *packet = malloc(sizeof(*packet));
1635 meshlink_errno = MESHLINK_ENOMEM;
1639 packet->probe = false;
1640 packet->tcp = false;
1641 packet->len = len + sizeof(*hdr);
1643 hdr = (meshlink_packethdr_t *)packet->data;
1644 memset(hdr, 0, sizeof(*hdr));
1645 // leave the last byte as 0 to make sure strings are always
1646 // null-terminated if they are longer than the buffer
1647 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1648 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1650 memcpy(packet->data + sizeof(*hdr), data, len);
1653 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1655 meshlink_errno = MESHLINK_ENOMEM;
1659 // Notify event loop
1660 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1665 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1667 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1673 mesh->self->in_packets++;
1674 mesh->self->in_bytes += packet->len;
1675 route(mesh, mesh->self, packet);
1678 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1679 if(!mesh || !destination) {
1680 meshlink_errno = MESHLINK_EINVAL;
1684 pthread_mutex_lock(&(mesh->mesh_mutex));
1686 node_t *n = (node_t *)destination;
1688 if(!n->status.reachable) {
1689 pthread_mutex_unlock(&(mesh->mesh_mutex));
1692 } else if(n->mtuprobes > 30 && n->minmtu) {
1693 pthread_mutex_unlock(&(mesh->mesh_mutex));
1696 pthread_mutex_unlock(&(mesh->mesh_mutex));
1701 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1702 if(!mesh || !node) {
1703 meshlink_errno = MESHLINK_EINVAL;
1707 pthread_mutex_lock(&(mesh->mesh_mutex));
1709 node_t *n = (node_t *)node;
1711 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1712 meshlink_errno = MESHLINK_EINTERNAL;
1713 pthread_mutex_unlock(&(mesh->mesh_mutex));
1717 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1720 meshlink_errno = MESHLINK_EINTERNAL;
1723 pthread_mutex_unlock(&(mesh->mesh_mutex));
1727 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1729 meshlink_errno = MESHLINK_EINVAL;
1733 return (meshlink_node_t *)mesh->self;
1736 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1737 if(!mesh || !name) {
1738 meshlink_errno = MESHLINK_EINVAL;
1742 meshlink_node_t *node = NULL;
1744 pthread_mutex_lock(&(mesh->mesh_mutex));
1745 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1746 pthread_mutex_unlock(&(mesh->mesh_mutex));
1750 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
1751 if(!mesh || !name) {
1752 meshlink_errno = MESHLINK_EINVAL;
1756 meshlink_submesh_t *submesh = NULL;
1758 pthread_mutex_lock(&(mesh->mesh_mutex));
1759 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
1760 pthread_mutex_unlock(&(mesh->mesh_mutex));
1764 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1765 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1766 meshlink_errno = MESHLINK_EINVAL;
1770 meshlink_node_t **result;
1773 pthread_mutex_lock(&(mesh->mesh_mutex));
1775 *nmemb = mesh->nodes->count;
1776 result = realloc(nodes, *nmemb * sizeof(*nodes));
1779 meshlink_node_t **p = result;
1781 for splay_each(node_t, n, mesh->nodes) {
1782 *p++ = (meshlink_node_t *)n;
1787 meshlink_errno = MESHLINK_ENOMEM;
1790 pthread_mutex_unlock(&(mesh->mesh_mutex));
1795 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) {
1796 meshlink_node_t **result;
1798 pthread_mutex_lock(&(mesh->mesh_mutex));
1802 for splay_each(node_t, n, mesh->nodes) {
1803 if(true == search_node(n, condition)) {
1804 *nmemb = *nmemb + 1;
1810 pthread_mutex_unlock(&(mesh->mesh_mutex));
1814 result = realloc(nodes, *nmemb * sizeof(*nodes));
1817 meshlink_node_t **p = result;
1819 for splay_each(node_t, n, mesh->nodes) {
1820 if(true == search_node(n, condition)) {
1821 *p++ = (meshlink_node_t *)n;
1827 meshlink_errno = MESHLINK_ENOMEM;
1830 pthread_mutex_unlock(&(mesh->mesh_mutex));
1835 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1836 dev_class_t *devclass = (dev_class_t *)condition;
1838 if(*devclass == (dev_class_t)node->devclass) {
1845 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1846 if(condition == node->submesh) {
1853 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) {
1854 if(!mesh || ((int)devclass < 0) || (devclass > _DEV_CLASS_MAX) || !nmemb) {
1855 meshlink_errno = MESHLINK_EINVAL;
1859 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
1862 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
1863 if(!mesh || !submesh || !nmemb) {
1864 meshlink_errno = MESHLINK_EINVAL;
1868 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
1871 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
1872 if(!mesh || !node) {
1873 meshlink_errno = MESHLINK_EINVAL;
1877 dev_class_t devclass;
1879 pthread_mutex_lock(&(mesh->mesh_mutex));
1881 devclass = ((node_t *)node)->devclass;
1883 pthread_mutex_unlock(&(mesh->mesh_mutex));
1888 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
1889 if(!mesh || !node) {
1890 meshlink_errno = MESHLINK_EINVAL;
1894 node_t *n = (node_t *)node;
1896 meshlink_submesh_t *s;
1898 s = (meshlink_submesh_t *)n->submesh;
1903 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1904 if(!mesh || !data || !len || !signature || !siglen) {
1905 meshlink_errno = MESHLINK_EINVAL;
1909 if(*siglen < MESHLINK_SIGLEN) {
1910 meshlink_errno = MESHLINK_EINVAL;
1914 pthread_mutex_lock(&(mesh->mesh_mutex));
1916 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
1917 meshlink_errno = MESHLINK_EINTERNAL;
1918 pthread_mutex_unlock(&(mesh->mesh_mutex));
1922 *siglen = MESHLINK_SIGLEN;
1923 pthread_mutex_unlock(&(mesh->mesh_mutex));
1927 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1928 if(!mesh || !data || !len || !signature) {
1929 meshlink_errno = MESHLINK_EINVAL;
1933 if(siglen != MESHLINK_SIGLEN) {
1934 meshlink_errno = MESHLINK_EINVAL;
1938 pthread_mutex_lock(&(mesh->mesh_mutex));
1942 struct node_t *n = (struct node_t *)source;
1944 if(!node_read_public_key(mesh, n)) {
1945 meshlink_errno = MESHLINK_EINTERNAL;
1948 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1951 pthread_mutex_unlock(&(mesh->mesh_mutex));
1955 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1956 pthread_mutex_lock(&(mesh->mesh_mutex));
1958 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
1961 // TODO: Update invitation key if necessary?
1964 pthread_mutex_unlock(&(mesh->mesh_mutex));
1966 return mesh->invitation_key;
1969 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1970 if(!mesh || !node || !address) {
1971 meshlink_errno = MESHLINK_EINVAL;
1975 if(!is_valid_hostname(address)) {
1976 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1977 meshlink_errno = MESHLINK_EINVAL;
1981 if(port && !is_valid_port(port)) {
1982 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1983 meshlink_errno = MESHLINK_EINVAL;
1987 char *canonical_address;
1990 xasprintf(&canonical_address, "%s %s", address, port);
1992 canonical_address = xstrdup(address);
1995 pthread_mutex_lock(&(mesh->mesh_mutex));
1997 node_t *n = (node_t *)node;
1998 free(n->canonical_address);
1999 n->canonical_address = canonical_address;
2000 node_write_config(mesh, n);
2002 pthread_mutex_unlock(&(mesh->mesh_mutex));
2007 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2008 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2011 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2013 meshlink_errno = MESHLINK_EINVAL;
2017 char *address = meshlink_get_external_address(mesh);
2023 bool rval = meshlink_add_address(mesh, address);
2029 int meshlink_get_port(meshlink_handle_t *mesh) {
2031 meshlink_errno = MESHLINK_EINVAL;
2036 meshlink_errno = MESHLINK_EINTERNAL;
2040 return atoi(mesh->myport);
2043 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2044 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2045 meshlink_errno = MESHLINK_EINVAL;
2049 if(mesh->myport && port == atoi(mesh->myport)) {
2053 if(!try_bind(port)) {
2054 meshlink_errno = MESHLINK_ENETWORK;
2058 devtool_trybind_probe();
2062 pthread_mutex_lock(&(mesh->mesh_mutex));
2064 if(mesh->threadstarted) {
2065 meshlink_errno = MESHLINK_EINVAL;
2070 xasprintf(&mesh->myport, "%d", port);
2072 /* Write meshlink.conf with the updated port number */
2073 write_main_config_files(mesh);
2075 /* Close down the network. This also deletes mesh->self. */
2076 close_network_connections(mesh);
2078 /* Recreate mesh->self. */
2079 mesh->self = new_node();
2080 mesh->self->name = xstrdup(mesh->name);
2081 mesh->self->devclass = mesh->devclass;
2082 xasprintf(&mesh->myport, "%d", port);
2084 if(!node_read_public_key(mesh, mesh->self)) {
2085 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2086 meshlink_errno = MESHLINK_ESTORAGE;
2087 free_node(mesh->self);
2089 } else if(!setup_network(mesh)) {
2090 meshlink_errno = MESHLINK_ENETWORK;
2096 pthread_mutex_unlock(&(mesh->mesh_mutex));
2098 return rval && meshlink_get_port(mesh) == port;
2101 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2102 mesh->invitation_timeout = timeout;
2105 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2106 meshlink_submesh_t *s = NULL;
2109 meshlink_errno = MESHLINK_EINVAL;
2114 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2117 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2118 meshlink_errno = MESHLINK_EINVAL;
2122 s = (meshlink_submesh_t *)mesh->self->submesh;
2125 pthread_mutex_lock(&(mesh->mesh_mutex));
2127 // Check validity of the new node's name
2128 if(!check_id(name)) {
2129 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2130 meshlink_errno = MESHLINK_EINVAL;
2131 pthread_mutex_unlock(&(mesh->mesh_mutex));
2135 // Ensure no host configuration file with that name exists
2136 if(config_exists(mesh, "current", name)) {
2137 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2138 meshlink_errno = MESHLINK_EEXIST;
2139 pthread_mutex_unlock(&(mesh->mesh_mutex));
2143 // Ensure no other nodes know about this name
2144 if(meshlink_get_node(mesh, name)) {
2145 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2146 meshlink_errno = MESHLINK_EEXIST;
2147 pthread_mutex_unlock(&(mesh->mesh_mutex));
2151 // Get the local address
2152 char *address = get_my_hostname(mesh, flags);
2155 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2156 meshlink_errno = MESHLINK_ERESOLV;
2157 pthread_mutex_unlock(&(mesh->mesh_mutex));
2161 if(!refresh_invitation_key(mesh)) {
2162 meshlink_errno = MESHLINK_EINTERNAL;
2163 pthread_mutex_unlock(&(mesh->mesh_mutex));
2169 // Create a hash of the key.
2170 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2171 sha512(fingerprint, strlen(fingerprint), hash);
2172 b64encode_urlsafe(hash, hash, 18);
2174 // Create a random cookie for this invitation.
2176 randomize(cookie, 18);
2178 // Create a filename that doesn't reveal the cookie itself
2179 char buf[18 + strlen(fingerprint)];
2180 char cookiehash[64];
2181 memcpy(buf, cookie, 18);
2182 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2183 sha512(buf, sizeof(buf), cookiehash);
2184 b64encode_urlsafe(cookiehash, cookiehash, 18);
2186 b64encode_urlsafe(cookie, cookie, 18);
2190 /* Construct the invitation file */
2191 uint8_t outbuf[4096];
2192 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2194 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2195 packmsg_add_str(&inv, name);
2196 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2197 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2199 /* TODO: Add several host config files to bootstrap connections.
2200 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2201 * and are not blacklisted.
2203 config_t configs[5] = {NULL};
2206 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2210 /* Append host config files to the invitation file */
2211 packmsg_add_array(&inv, count);
2213 for(int i = 0; i < count; i++) {
2214 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2215 config_free(&configs[i]);
2218 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2220 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2221 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2222 meshlink_errno = MESHLINK_ESTORAGE;
2223 pthread_mutex_unlock(&(mesh->mesh_mutex));
2227 // Create an URL from the local address, key hash and cookie
2229 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2232 pthread_mutex_unlock(&(mesh->mesh_mutex));
2236 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2237 return meshlink_invite_ex(mesh, submesh, name, 0);
2240 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2241 if(!mesh || !invitation) {
2242 meshlink_errno = MESHLINK_EINVAL;
2246 pthread_mutex_lock(&(mesh->mesh_mutex));
2248 //Before doing meshlink_join make sure we are not connected to another mesh
2249 if(mesh->threadstarted) {
2250 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2251 meshlink_errno = MESHLINK_EINVAL;
2252 pthread_mutex_unlock(&(mesh->mesh_mutex));
2256 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2257 char copy[strlen(invitation) + 1];
2258 strcpy(copy, invitation);
2260 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2262 char *slash = strchr(copy, '/');
2270 if(strlen(slash) != 48) {
2274 char *address = copy;
2277 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2281 // Generate a throw-away key for the invitation.
2282 ecdsa_t *key = ecdsa_generate();
2285 meshlink_errno = MESHLINK_EINTERNAL;
2286 pthread_mutex_unlock(&(mesh->mesh_mutex));
2290 char *b64key = ecdsa_get_base64_public_key(key);
2294 while(address && *address) {
2295 // We allow commas in the address part to support multiple addresses in one invitation URL.
2296 comma = strchr(address, ',');
2302 // Split of the port
2303 port = strrchr(address, ':');
2311 // IPv6 address are enclosed in brackets, per RFC 3986
2312 if(*address == '[') {
2314 char *bracket = strchr(address, ']');
2327 // Connect to the meshlink daemon mentioned in the URL.
2328 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2331 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2332 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2334 if(mesh->sock == -1) {
2335 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2336 meshlink_errno = MESHLINK_ENETWORK;
2340 set_timeout(mesh->sock, 5000);
2342 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2343 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2344 meshlink_errno = MESHLINK_ENETWORK;
2345 closesocket(mesh->sock);
2353 meshlink_errno = MESHLINK_ERESOLV;
2356 if(mesh->sock != -1 || !comma) {
2363 if(mesh->sock == -1) {
2364 pthread_mutex_unlock(&mesh->mesh_mutex);
2368 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2370 // Tell him we have an invitation, and give him our throw-away key.
2374 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2375 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2376 closesocket(mesh->sock);
2377 meshlink_errno = MESHLINK_ENETWORK;
2378 pthread_mutex_unlock(&(mesh->mesh_mutex));
2384 char hisname[4096] = "";
2385 int code, hismajor, hisminor = 0;
2387 if(!recvline(mesh, sizeof(mesh)->line) || sscanf(mesh->line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(mesh, sizeof(mesh)->line) || !rstrip(mesh->line) || sscanf(mesh->line, "%d ", &code) != 1 || code != ACK || strlen(mesh->line) < 3) {
2388 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2389 closesocket(mesh->sock);
2390 meshlink_errno = MESHLINK_ENETWORK;
2391 pthread_mutex_unlock(&(mesh->mesh_mutex));
2395 // Check if the hash of the key he gave us matches the hash in the URL.
2396 char *fingerprint = mesh->line + 2;
2399 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2400 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2401 meshlink_errno = MESHLINK_EINTERNAL;
2402 pthread_mutex_unlock(&(mesh->mesh_mutex));
2406 if(memcmp(hishash, mesh->hash, 18)) {
2407 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2408 meshlink_errno = MESHLINK_EPEER;
2409 pthread_mutex_unlock(&(mesh->mesh_mutex));
2414 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2417 meshlink_errno = MESHLINK_EINTERNAL;
2418 pthread_mutex_unlock(&(mesh->mesh_mutex));
2422 // Start an SPTPS session
2423 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2424 meshlink_errno = MESHLINK_EINTERNAL;
2425 pthread_mutex_unlock(&(mesh->mesh_mutex));
2429 // Feed rest of input buffer to SPTPS
2430 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2431 meshlink_errno = MESHLINK_EPEER;
2432 pthread_mutex_unlock(&(mesh->mesh_mutex));
2438 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2440 if(errno == EINTR) {
2444 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2445 meshlink_errno = MESHLINK_ENETWORK;
2446 pthread_mutex_unlock(&(mesh->mesh_mutex));
2450 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2451 meshlink_errno = MESHLINK_EPEER;
2452 pthread_mutex_unlock(&(mesh->mesh_mutex));
2457 sptps_stop(&mesh->sptps);
2460 closesocket(mesh->sock);
2462 if(!mesh->success) {
2463 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2464 meshlink_errno = MESHLINK_EPEER;
2465 pthread_mutex_unlock(&(mesh->mesh_mutex));
2469 pthread_mutex_unlock(&(mesh->mesh_mutex));
2473 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2474 meshlink_errno = MESHLINK_EINVAL;
2475 pthread_mutex_unlock(&(mesh->mesh_mutex));
2479 char *meshlink_export(meshlink_handle_t *mesh) {
2481 meshlink_errno = MESHLINK_EINVAL;
2485 // Create a config file on the fly.
2488 packmsg_output_t out = {buf, sizeof(buf)};
2489 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2490 packmsg_add_str(&out, mesh->name);
2491 packmsg_add_str(&out, CORE_MESH);
2493 pthread_mutex_lock(&(mesh->mesh_mutex));
2495 packmsg_add_int32(&out, mesh->self->devclass);
2496 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2497 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2498 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2502 for(uint32_t i = 0; i < 5; i++) {
2503 if(mesh->self->recent[i].sa.sa_family) {
2510 packmsg_add_array(&out, count);
2512 for(uint32_t i = 0; i < count; i++) {
2513 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2516 pthread_mutex_unlock(&(mesh->mesh_mutex));
2518 if(!packmsg_output_ok(&out)) {
2519 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2520 meshlink_errno = MESHLINK_EINTERNAL;
2524 // Prepare a base64-encoded packmsg array containing our config file
2526 uint32_t len = packmsg_output_size(&out, buf);
2527 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2528 uint8_t *buf2 = xmalloc(len2);
2529 packmsg_output_t out2 = {buf2, len2};
2530 packmsg_add_array(&out2, 1);
2531 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2533 if(!packmsg_output_ok(&out2)) {
2534 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2535 meshlink_errno = MESHLINK_EINTERNAL;
2540 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2542 return (char *)buf2;
2545 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2546 if(!mesh || !data) {
2547 meshlink_errno = MESHLINK_EINVAL;
2551 size_t datalen = strlen(data);
2552 uint8_t *buf = xmalloc(datalen);
2553 int buflen = b64decode(data, buf, datalen);
2556 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2557 meshlink_errno = MESHLINK_EPEER;
2561 packmsg_input_t in = {buf, buflen};
2562 uint32_t count = packmsg_get_array(&in);
2565 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2566 meshlink_errno = MESHLINK_EPEER;
2570 pthread_mutex_lock(&(mesh->mesh_mutex));
2574 uint32_t len = packmsg_get_bin_raw(&in, &data);
2580 packmsg_input_t in2 = {data, len};
2581 uint32_t version = packmsg_get_uint32(&in2);
2582 char *name = packmsg_get_str_dup(&in2);
2584 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2586 packmsg_input_invalidate(&in);
2590 if(!check_id(name)) {
2595 node_t *n = lookup_node(mesh, name);
2598 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2606 config_t config = {data, len};
2608 if(!node_read_from_config(mesh, n, &config)) {
2610 packmsg_input_invalidate(&in);
2614 config_write(mesh, "current", n->name, &config, mesh->config_key);
2618 pthread_mutex_unlock(&(mesh->mesh_mutex));
2620 if(!packmsg_done(&in)) {
2621 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2622 meshlink_errno = MESHLINK_EPEER;
2629 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2630 if(!mesh || !node) {
2631 meshlink_errno = MESHLINK_EINVAL;
2635 pthread_mutex_lock(&(mesh->mesh_mutex));
2640 if(n == mesh->self) {
2641 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2642 meshlink_errno = MESHLINK_EINVAL;
2643 pthread_mutex_unlock(&(mesh->mesh_mutex));
2647 if(n->status.blacklisted) {
2648 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2649 pthread_mutex_unlock(&(mesh->mesh_mutex));
2653 n->status.blacklisted = true;
2654 node_write_config(mesh, n);
2655 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2657 //Immediately terminate any connections we have with the blacklisted node
2658 for list_each(connection_t, c, mesh->connections) {
2660 terminate_connection(mesh, c, c->status.active);
2664 utcp_abort_all_connections(n->utcp);
2670 n->status.udp_confirmed = false;
2672 if(n->status.reachable) {
2673 update_node_status(mesh, n);
2676 pthread_mutex_unlock(&(mesh->mesh_mutex));
2679 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2680 if(!mesh || !node) {
2681 meshlink_errno = MESHLINK_EINVAL;
2685 pthread_mutex_lock(&(mesh->mesh_mutex));
2687 node_t *n = (node_t *)node;
2689 if(!n->status.blacklisted) {
2690 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2691 meshlink_errno = MESHLINK_EINVAL;
2692 pthread_mutex_unlock(&(mesh->mesh_mutex));
2696 n->status.blacklisted = false;
2697 node_write_config(mesh, n);
2699 pthread_mutex_unlock(&(mesh->mesh_mutex));
2703 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2704 mesh->default_blacklist = blacklist;
2707 /* Hint that a hostname may be found at an address
2708 * See header file for detailed comment.
2710 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2711 if(!mesh || !node || !addr) {
2712 meshlink_errno = EINVAL;
2716 pthread_mutex_lock(&(mesh->mesh_mutex));
2718 node_t *n = (node_t *)node;
2719 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2720 memcpy(n->recent, addr, SALEN(*addr));
2721 node_write_config(mesh, n);
2723 pthread_mutex_unlock(&(mesh->mesh_mutex));
2724 // @TODO do we want to fire off a connection attempt right away?
2727 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2729 node_t *n = utcp->priv;
2730 meshlink_handle_t *mesh = n->mesh;
2731 return mesh->channel_accept_cb;
2734 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2735 meshlink_channel_t *channel = connection->priv;
2741 node_t *n = channel->node;
2742 meshlink_handle_t *mesh = n->mesh;
2744 if(n->status.destroyed) {
2745 meshlink_channel_close(mesh, channel);
2746 } else if(channel->receive_cb) {
2747 channel->receive_cb(mesh, channel, data, len);
2753 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2754 node_t *n = utcp_connection->utcp->priv;
2760 meshlink_handle_t *mesh = n->mesh;
2762 if(!mesh->channel_accept_cb) {
2766 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2768 channel->c = utcp_connection;
2770 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2771 utcp_accept(utcp_connection, channel_recv, channel);
2777 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2778 node_t *n = utcp->priv;
2780 if(n->status.destroyed) {
2784 meshlink_handle_t *mesh = n->mesh;
2785 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2788 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2789 if(!mesh || !channel) {
2790 meshlink_errno = MESHLINK_EINVAL;
2794 channel->receive_cb = cb;
2797 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2799 node_t *n = (node_t *)source;
2805 utcp_recv(n->utcp, data, len);
2808 static void channel_poll(struct utcp_connection *connection, size_t len) {
2809 meshlink_channel_t *channel = connection->priv;
2815 node_t *n = channel->node;
2816 meshlink_handle_t *mesh = n->mesh;
2818 if(channel->poll_cb) {
2819 channel->poll_cb(mesh, channel, len);
2823 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2825 channel->poll_cb = cb;
2826 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2829 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2831 meshlink_errno = MESHLINK_EINVAL;
2835 pthread_mutex_lock(&mesh->mesh_mutex);
2836 mesh->channel_accept_cb = cb;
2837 mesh->receive_cb = channel_receive;
2839 for splay_each(node_t, n, mesh->nodes) {
2840 if(!n->utcp && n != mesh->self) {
2841 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2845 pthread_mutex_unlock(&mesh->mesh_mutex);
2848 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) {
2850 abort(); // TODO: handle non-NULL data
2853 if(!mesh || !node) {
2854 meshlink_errno = MESHLINK_EINVAL;
2858 node_t *n = (node_t *)node;
2861 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2862 mesh->receive_cb = channel_receive;
2865 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2870 if(n->status.blacklisted) {
2871 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
2875 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2877 channel->receive_cb = cb;
2878 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2881 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2889 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) {
2890 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2893 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2894 if(!mesh || !channel) {
2895 meshlink_errno = MESHLINK_EINVAL;
2899 utcp_shutdown(channel->c, direction);
2902 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2903 if(!mesh || !channel) {
2904 meshlink_errno = MESHLINK_EINVAL;
2908 utcp_close(channel->c);
2912 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2913 if(!mesh || !channel) {
2914 meshlink_errno = MESHLINK_EINVAL;
2923 meshlink_errno = MESHLINK_EINVAL;
2927 // TODO: more finegrained locking.
2928 // Ideally we want to put the data into the UTCP connection's send buffer.
2929 // Then, preferably only if there is room in the receiver window,
2930 // kick the meshlink thread to go send packets.
2932 pthread_mutex_lock(&mesh->mesh_mutex);
2933 ssize_t retval = utcp_send(channel->c, data, len);
2934 pthread_mutex_unlock(&mesh->mesh_mutex);
2937 meshlink_errno = MESHLINK_ENETWORK;
2943 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2944 if(!mesh || !channel) {
2945 meshlink_errno = MESHLINK_EINVAL;
2949 return channel->c->flags;
2952 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2953 if(!mesh || !channel) {
2954 meshlink_errno = MESHLINK_EINVAL;
2958 return utcp_get_sendq(channel->c);
2961 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2962 if(!mesh || !channel) {
2963 meshlink_errno = MESHLINK_EINVAL;
2967 return utcp_get_recvq(channel->c);
2970 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2971 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2972 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2975 if(mesh->node_status_cb) {
2976 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
2980 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
2981 if(!mesh->node_duplicate_cb || n->status.duplicate) {
2985 n->status.duplicate = true;
2986 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
2989 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2993 meshlink_errno = MESHLINK_EINVAL;
2997 pthread_mutex_lock(&mesh->mesh_mutex);
2999 if(mesh->discovery == enable) {
3003 if(mesh->threadstarted) {
3005 discovery_start(mesh);
3007 discovery_stop(mesh);
3011 mesh->discovery = enable;
3014 pthread_mutex_unlock(&mesh->mesh_mutex);
3018 meshlink_errno = MESHLINK_ENOTSUP;
3022 static void __attribute__((constructor)) meshlink_init(void) {
3025 randomize(&seed, sizeof(seed));
3029 static void __attribute__((destructor)) meshlink_exit(void) {
3033 /// Device class traits
3034 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
3035 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
3036 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
3037 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
3038 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN