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])) {
336 if(found || !is_valid_hostname(host[i])) {
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);
420 if(err || !is_valid_hostname(resolved_host)) {
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 static int check_port(meshlink_handle_t *mesh) {
518 for(int i = 0; i < 1000; i++) {
519 int port = 0x1000 + prng(mesh, 0x8000);
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 dev_class_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 == DEV_CLASS_UNKNOWN ? mesh->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 /* Ensure the configuration directory metadata is on disk */
665 if(!config_sync(mesh, "current")) {
669 sptps_send_record(&mesh->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
671 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
676 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
678 meshlink_handle_t *mesh = handle;
679 const char *ptr = data;
682 int result = send(mesh->sock, ptr, len, 0);
684 if(result == -1 && errno == EINTR) {
686 } else if(result <= 0) {
697 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
698 meshlink_handle_t *mesh = handle;
701 case SPTPS_HANDSHAKE:
702 return sptps_send_record(&mesh->sptps, 0, mesh->cookie, sizeof(mesh)->cookie);
705 return finalize_join(mesh, msg, len);
708 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
709 shutdown(mesh->sock, SHUT_RDWR);
710 mesh->success = true;
720 static bool recvline(meshlink_handle_t *mesh, size_t len) {
721 char *newline = NULL;
727 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
728 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
730 if(result == -1 && errno == EINTR) {
732 } else if(result <= 0) {
736 mesh->blen += result;
739 if((size_t)(newline - mesh->buffer) >= len) {
743 len = newline - mesh->buffer;
745 memcpy(mesh->line, mesh->buffer, len);
747 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
748 mesh->blen -= len + 1;
753 static bool sendline(int fd, char *format, ...) {
759 va_start(ap, format);
760 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
763 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
771 int result = send(fd, p, blen, MSG_NOSIGNAL);
773 if(result == -1 && errno == EINTR) {
775 } else if(result <= 0) {
786 static const char *errstr[] = {
787 [MESHLINK_OK] = "No error",
788 [MESHLINK_EINVAL] = "Invalid argument",
789 [MESHLINK_ENOMEM] = "Out of memory",
790 [MESHLINK_ENOENT] = "No such node",
791 [MESHLINK_EEXIST] = "Node already exists",
792 [MESHLINK_EINTERNAL] = "Internal error",
793 [MESHLINK_ERESOLV] = "Could not resolve hostname",
794 [MESHLINK_ESTORAGE] = "Storage error",
795 [MESHLINK_ENETWORK] = "Network error",
796 [MESHLINK_EPEER] = "Error communicating with peer",
797 [MESHLINK_ENOTSUP] = "Operation not supported",
798 [MESHLINK_EBUSY] = "MeshLink instance already in use",
801 const char *meshlink_strerror(meshlink_errno_t err) {
802 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
803 return "Invalid error code";
809 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
810 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
812 mesh->private_key = ecdsa_generate();
813 mesh->invitation_key = ecdsa_generate();
815 if(!mesh->private_key || !mesh->invitation_key) {
816 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
817 meshlink_errno = MESHLINK_EINTERNAL;
821 logger(mesh, MESHLINK_DEBUG, "Done.\n");
826 static struct timeval idle(event_loop_t *loop, void *data) {
828 meshlink_handle_t *mesh = data;
829 struct timeval t, tmin = {3600, 0};
831 for splay_each(node_t, n, mesh->nodes) {
836 t = utcp_timeout(n->utcp);
838 if(timercmp(&t, &tmin, <)) {
846 // Get our local address(es) by simulating connecting to an Internet host.
847 static void add_local_addresses(meshlink_handle_t *mesh) {
848 struct sockaddr_storage sn;
849 sn.ss_family = AF_UNKNOWN;
850 socklen_t sl = sizeof(sn);
854 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
855 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
856 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
863 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
864 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
865 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
869 static bool meshlink_setup(meshlink_handle_t *mesh) {
870 if(!config_init(mesh, "current")) {
871 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
872 meshlink_errno = MESHLINK_ESTORAGE;
876 if(!ecdsa_keygen(mesh)) {
877 meshlink_errno = MESHLINK_EINTERNAL;
881 if(check_port(mesh) == 0) {
882 meshlink_errno = MESHLINK_ENETWORK;
886 /* Create a node for ourself */
888 mesh->self = new_node();
889 mesh->self->name = xstrdup(mesh->name);
890 mesh->self->devclass = mesh->devclass;
891 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
892 mesh->self->session_id = mesh->session_id;
894 if(!write_main_config_files(mesh)) {
895 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
896 meshlink_errno = MESHLINK_ESTORAGE;
900 /* Ensure the configuration directory metadata is on disk */
901 if(!config_sync(mesh, "current")) {
905 if(!main_config_lock(mesh)) {
906 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
907 meshlink_errno = MESHLINK_ESTORAGE;
914 static bool meshlink_read_config(meshlink_handle_t *mesh) {
915 // Open the configuration file and lock it
916 if(!main_config_lock(mesh)) {
917 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
918 meshlink_errno = MESHLINK_ESTORAGE;
924 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
925 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
929 packmsg_input_t in = {config.buf, config.len};
930 const void *private_key;
931 const void *invitation_key;
933 uint32_t version = packmsg_get_uint32(&in);
934 char *name = packmsg_get_str_dup(&in);
935 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
936 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
937 uint16_t myport = packmsg_get_uint16(&in);
939 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
940 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
942 config_free(&config);
949 if(mesh->name && strcmp(mesh->name, name)) {
950 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
951 meshlink_errno = MESHLINK_ESTORAGE;
953 config_free(&config);
961 xasprintf(&mesh->myport, "%u", myport);
962 mesh->private_key = ecdsa_set_private_key(private_key);
963 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
964 config_free(&config);
966 /* Create a node for ourself and read our host configuration file */
968 mesh->self = new_node();
969 mesh->self->name = xstrdup(name);
970 mesh->self->devclass = mesh->devclass;
971 mesh->self->session_id = mesh->session_id;
973 if(!node_read_public_key(mesh, mesh->self)) {
974 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
975 meshlink_errno = MESHLINK_ESTORAGE;
976 free_node(mesh->self);
985 static void *setup_network_in_netns_thread(void *arg) {
986 meshlink_handle_t *mesh = arg;
988 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
992 bool success = setup_network(mesh);
993 add_local_addresses(mesh);
994 return success ? arg : NULL;
998 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
999 if(!confbase || !*confbase) {
1000 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1001 meshlink_errno = MESHLINK_EINVAL;
1005 if(!appname || !*appname) {
1006 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1007 meshlink_errno = MESHLINK_EINVAL;
1011 if(strchr(appname, ' ')) {
1012 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1013 meshlink_errno = MESHLINK_EINVAL;
1017 if(!name || !*name) {
1018 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1019 meshlink_errno = MESHLINK_EINVAL;
1023 if(!check_id(name)) {
1024 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1025 meshlink_errno = MESHLINK_EINVAL;
1029 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1030 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1031 meshlink_errno = MESHLINK_EINVAL;
1035 meshlink_open_params_t *params = xzalloc(sizeof * params);
1037 params->confbase = xstrdup(confbase);
1038 params->name = xstrdup(name);
1039 params->appname = xstrdup(appname);
1040 params->devclass = devclass;
1046 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1048 meshlink_errno = MESHLINK_EINVAL;
1052 params->netns = netns;
1057 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1059 meshlink_errno = MESHLINK_EINVAL;
1063 if((!key && keylen) || (key && !keylen)) {
1064 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1065 meshlink_errno = MESHLINK_EINVAL;
1070 params->keylen = keylen;
1075 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1076 if(!mesh || !new_key || !new_keylen) {
1077 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1078 meshlink_errno = MESHLINK_EINVAL;
1082 pthread_mutex_lock(&mesh->mutex);
1084 // Create hash for the new key
1085 void *new_config_key;
1086 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1088 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1089 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1090 meshlink_errno = MESHLINK_EINTERNAL;
1091 pthread_mutex_unlock(&mesh->mutex);
1095 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1097 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1098 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1099 meshlink_errno = MESHLINK_ESTORAGE;
1100 pthread_mutex_unlock(&mesh->mutex);
1104 devtool_keyrotate_probe(1);
1106 main_config_unlock(mesh);
1108 // Rename confbase/current/ to confbase/old
1110 if(!config_rename(mesh, "current", "old")) {
1111 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1112 meshlink_errno = MESHLINK_ESTORAGE;
1113 main_config_lock(mesh);
1114 pthread_mutex_unlock(&mesh->mutex);
1118 devtool_keyrotate_probe(2);
1120 // Rename confbase/new/ to confbase/current
1122 if(!config_rename(mesh, "new", "current")) {
1123 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1124 meshlink_errno = MESHLINK_ESTORAGE;
1125 main_config_lock(mesh);
1126 pthread_mutex_unlock(&mesh->mutex);
1130 devtool_keyrotate_probe(3);
1132 if(!main_config_lock(mesh)) {
1133 pthread_mutex_unlock(&mesh->mutex);
1137 // Cleanup the "old" confbase sub-directory
1139 if(!config_destroy(mesh->confbase, "old")) {
1140 pthread_mutex_unlock(&mesh->mutex);
1144 // Change the mesh handle key with new key
1146 free(mesh->config_key);
1147 mesh->config_key = new_config_key;
1149 pthread_mutex_unlock(&mesh->mutex);
1154 void meshlink_open_params_free(meshlink_open_params_t *params) {
1156 meshlink_errno = MESHLINK_EINVAL;
1160 free(params->confbase);
1162 free(params->appname);
1167 /// Device class traits
1168 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1169 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1170 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1171 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1172 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1175 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1176 if(!confbase || !*confbase) {
1177 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1178 meshlink_errno = MESHLINK_EINVAL;
1182 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1183 meshlink_open_params_t params;
1184 memset(¶ms, 0, sizeof(params));
1186 params.confbase = (char *)confbase;
1187 params.name = (char *)name;
1188 params.appname = (char *)appname;
1189 params.devclass = devclass;
1192 return meshlink_open_ex(¶ms);
1195 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) {
1196 if(!confbase || !*confbase) {
1197 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1198 meshlink_errno = MESHLINK_EINVAL;
1202 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1203 meshlink_open_params_t params;
1204 memset(¶ms, 0, sizeof(params));
1206 params.confbase = (char *)confbase;
1207 params.name = (char *)name;
1208 params.appname = (char *)appname;
1209 params.devclass = devclass;
1212 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1216 return meshlink_open_ex(¶ms);
1219 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1220 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1221 meshlink_open_params_t params;
1222 memset(¶ms, 0, sizeof(params));
1224 params.name = (char *)name;
1225 params.appname = (char *)appname;
1226 params.devclass = devclass;
1229 return meshlink_open_ex(¶ms);
1232 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1233 // Validate arguments provided by the application
1234 bool usingname = false;
1236 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1238 if(!params->appname || !*params->appname) {
1239 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1240 meshlink_errno = MESHLINK_EINVAL;
1244 if(strchr(params->appname, ' ')) {
1245 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1246 meshlink_errno = MESHLINK_EINVAL;
1250 if(!params->name || !*params->name) {
1251 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1253 } else { //check name only if there is a name != NULL
1255 if(!check_id(params->name)) {
1256 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1257 meshlink_errno = MESHLINK_EINVAL;
1264 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1265 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1266 meshlink_errno = MESHLINK_EINVAL;
1270 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1271 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1272 meshlink_errno = MESHLINK_EINVAL;
1276 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1278 if(params->confbase) {
1279 mesh->confbase = xstrdup(params->confbase);
1282 mesh->appname = xstrdup(params->appname);
1283 mesh->devclass = params->devclass;
1284 mesh->discovery = true;
1285 mesh->invitation_timeout = 604800; // 1 week
1286 mesh->netns = params->netns;
1287 mesh->submeshes = NULL;
1288 mesh->log_cb = global_log_cb;
1289 mesh->log_level = global_log_level;
1291 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1294 randomize(&mesh->session_id, sizeof(mesh->session_id));
1295 } while(mesh->session_id == 0);
1297 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1300 mesh->name = xstrdup(params->name);
1305 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1307 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1308 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1309 meshlink_close(mesh);
1310 meshlink_errno = MESHLINK_EINTERNAL;
1316 pthread_mutexattr_t attr;
1317 pthread_mutexattr_init(&attr);
1318 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1319 pthread_mutex_init(&mesh->mutex, &attr);
1321 mesh->threadstarted = false;
1322 event_loop_init(&mesh->loop);
1323 mesh->loop.data = mesh;
1325 meshlink_queue_init(&mesh->outpacketqueue);
1327 // If no configuration exists yet, create it.
1329 if(!meshlink_confbase_exists(mesh)) {
1330 if(!meshlink_setup(mesh)) {
1331 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1332 meshlink_close(mesh);
1336 if(!meshlink_read_config(mesh)) {
1337 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1338 meshlink_close(mesh);
1344 struct WSAData wsa_state;
1345 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1348 // Setup up everything
1349 // TODO: we should not open listening sockets yet
1351 bool success = false;
1353 if(mesh->netns != -1) {
1357 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1358 void *retval = NULL;
1359 success = pthread_join(thr, &retval) == 0 && retval;
1363 meshlink_errno = MESHLINK_EINTERNAL;
1366 #endif // HAVE_SETNS
1368 success = setup_network(mesh);
1369 add_local_addresses(mesh);
1373 meshlink_close(mesh);
1374 meshlink_errno = MESHLINK_ENETWORK;
1378 add_local_addresses(mesh);
1379 node_write_config(mesh, mesh->self);
1381 idle_set(&mesh->loop, idle, mesh);
1383 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1387 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1388 meshlink_submesh_t *s = NULL;
1391 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1392 meshlink_errno = MESHLINK_EINVAL;
1396 if(!submesh || !*submesh) {
1397 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1398 meshlink_errno = MESHLINK_EINVAL;
1403 pthread_mutex_lock(&mesh->mutex);
1405 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1407 pthread_mutex_unlock(&mesh->mutex);
1412 static void *meshlink_main_loop(void *arg) {
1413 meshlink_handle_t *mesh = arg;
1415 if(mesh->netns != -1) {
1418 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1419 pthread_cond_signal(&mesh->cond);
1424 pthread_cond_signal(&mesh->cond);
1426 #endif // HAVE_SETNS
1431 if(mesh->discovery) {
1432 discovery_start(mesh);
1437 pthread_mutex_lock(&mesh->mutex);
1439 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1440 pthread_cond_broadcast(&mesh->cond);
1442 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1444 pthread_mutex_unlock(&mesh->mutex);
1449 if(mesh->discovery) {
1450 discovery_stop(mesh);
1458 bool meshlink_start(meshlink_handle_t *mesh) {
1460 assert(mesh->private_key);
1463 meshlink_errno = MESHLINK_EINVAL;
1467 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1469 pthread_mutex_lock(&mesh->mutex);
1471 assert(mesh->self->ecdsa);
1472 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1474 if(mesh->threadstarted) {
1475 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1476 pthread_mutex_unlock(&mesh->mutex);
1480 if(mesh->listen_socket[0].tcp.fd < 0) {
1481 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1482 meshlink_errno = MESHLINK_ENETWORK;
1486 mesh->thedatalen = 0;
1488 // TODO: open listening sockets first
1490 //Check that a valid name is set
1492 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1493 meshlink_errno = MESHLINK_EINVAL;
1494 pthread_mutex_unlock(&mesh->mutex);
1498 init_outgoings(mesh);
1500 // Start the main thread
1502 event_loop_start(&mesh->loop);
1504 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1505 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1506 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1507 meshlink_errno = MESHLINK_EINTERNAL;
1508 event_loop_stop(&mesh->loop);
1509 pthread_mutex_unlock(&mesh->mutex);
1513 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1514 mesh->threadstarted = true;
1516 pthread_mutex_unlock(&mesh->mutex);
1520 void meshlink_stop(meshlink_handle_t *mesh) {
1522 meshlink_errno = MESHLINK_EINVAL;
1526 pthread_mutex_lock(&mesh->mutex);
1527 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1529 // Shut down the main thread
1530 event_loop_stop(&mesh->loop);
1532 // Send ourselves a UDP packet to kick the event loop
1533 for(int i = 0; i < mesh->listen_sockets; i++) {
1535 socklen_t salen = sizeof(sa.sa);
1537 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1538 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1542 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1543 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1547 if(mesh->threadstarted) {
1548 // Wait for the main thread to finish
1549 pthread_mutex_unlock(&mesh->mutex);
1550 pthread_join(mesh->thread, NULL);
1551 pthread_mutex_lock(&mesh->mutex);
1553 mesh->threadstarted = false;
1556 // Close all metaconnections
1557 if(mesh->connections) {
1558 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1560 connection_t *c = node->data;
1562 terminate_connection(mesh, c, false);
1566 exit_outgoings(mesh);
1568 // Write out any changed node config files
1570 for splay_each(node_t, n, mesh->nodes) {
1571 if(n->status.dirty) {
1572 node_write_config(mesh, n);
1573 n->status.dirty = false;
1578 pthread_mutex_unlock(&mesh->mutex);
1581 void meshlink_close(meshlink_handle_t *mesh) {
1583 meshlink_errno = MESHLINK_EINVAL;
1587 // stop can be called even if mesh has not been started
1588 meshlink_stop(mesh);
1590 // lock is not released after this
1591 pthread_mutex_lock(&mesh->mutex);
1593 // Close and free all resources used.
1595 close_network_connections(mesh);
1597 logger(mesh, MESHLINK_INFO, "Terminating");
1599 event_loop_exit(&mesh->loop);
1603 if(mesh->confbase) {
1609 ecdsa_free(mesh->invitation_key);
1611 if(mesh->netns != -1) {
1615 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1619 meshlink_queue_exit(&mesh->outpacketqueue);
1622 free(mesh->appname);
1623 free(mesh->confbase);
1624 free(mesh->config_key);
1625 ecdsa_free(mesh->private_key);
1627 main_config_unlock(mesh);
1629 pthread_mutex_unlock(&mesh->mutex);
1630 pthread_mutex_destroy(&mesh->mutex);
1632 memset(mesh, 0, sizeof(*mesh));
1637 bool meshlink_destroy(const char *confbase) {
1639 meshlink_errno = MESHLINK_EINVAL;
1643 if(!config_destroy(confbase, "current")) {
1644 logger(NULL, MESHLINK_ERROR, "Cannot remove confbase sub-directories %s: %s\n", confbase, strerror(errno));
1648 config_destroy(confbase, "new");
1649 config_destroy(confbase, "old");
1651 if(rmdir(confbase) && errno != ENOENT) {
1652 logger(NULL, MESHLINK_ERROR, "Cannot remove directory %s: %s\n", confbase, strerror(errno));
1653 meshlink_errno = MESHLINK_ESTORAGE;
1660 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1662 meshlink_errno = MESHLINK_EINVAL;
1666 pthread_mutex_lock(&mesh->mutex);
1667 mesh->receive_cb = cb;
1668 pthread_mutex_unlock(&mesh->mutex);
1671 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1673 meshlink_errno = MESHLINK_EINVAL;
1677 pthread_mutex_lock(&mesh->mutex);
1678 mesh->connection_try_cb = cb;
1679 pthread_mutex_unlock(&mesh->mutex);
1682 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1684 meshlink_errno = MESHLINK_EINVAL;
1688 pthread_mutex_lock(&mesh->mutex);
1689 mesh->node_status_cb = cb;
1690 pthread_mutex_unlock(&mesh->mutex);
1693 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1695 meshlink_errno = MESHLINK_EINVAL;
1699 pthread_mutex_lock(&mesh->mutex);
1700 mesh->node_pmtu_cb = cb;
1701 pthread_mutex_unlock(&mesh->mutex);
1704 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1706 meshlink_errno = MESHLINK_EINVAL;
1710 pthread_mutex_lock(&mesh->mutex);
1711 mesh->node_duplicate_cb = cb;
1712 pthread_mutex_unlock(&mesh->mutex);
1715 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1717 pthread_mutex_lock(&mesh->mutex);
1719 mesh->log_level = cb ? level : 0;
1720 pthread_mutex_unlock(&mesh->mutex);
1723 global_log_level = cb ? level : 0;
1727 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1729 meshlink_errno = MESHLINK_EINVAL;
1733 pthread_mutex_lock(&mesh->mutex);
1734 mesh->error_cb = cb;
1735 pthread_mutex_unlock(&mesh->mutex);
1738 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1739 meshlink_packethdr_t *hdr;
1741 // Validate arguments
1742 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1743 meshlink_errno = MESHLINK_EINVAL;
1752 meshlink_errno = MESHLINK_EINVAL;
1756 node_t *n = (node_t *)destination;
1758 if(n->status.blacklisted) {
1759 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1763 // Prepare the packet
1764 vpn_packet_t *packet = malloc(sizeof(*packet));
1767 meshlink_errno = MESHLINK_ENOMEM;
1771 packet->probe = false;
1772 packet->tcp = false;
1773 packet->len = len + sizeof(*hdr);
1775 hdr = (meshlink_packethdr_t *)packet->data;
1776 memset(hdr, 0, sizeof(*hdr));
1777 // leave the last byte as 0 to make sure strings are always
1778 // null-terminated if they are longer than the buffer
1779 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1780 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1782 memcpy(packet->data + sizeof(*hdr), data, len);
1785 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1787 meshlink_errno = MESHLINK_ENOMEM;
1791 // Notify event loop
1792 signal_trigger(&mesh->loop, &mesh->datafromapp);
1797 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1799 meshlink_handle_t *mesh = data;
1800 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1806 mesh->self->in_packets++;
1807 mesh->self->in_bytes += packet->len;
1808 route(mesh, mesh->self, packet);
1813 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1814 if(!mesh || !destination) {
1815 meshlink_errno = MESHLINK_EINVAL;
1819 pthread_mutex_lock(&mesh->mutex);
1821 node_t *n = (node_t *)destination;
1823 if(!n->status.reachable) {
1824 pthread_mutex_unlock(&mesh->mutex);
1827 } else if(n->mtuprobes > 30 && n->minmtu) {
1828 pthread_mutex_unlock(&mesh->mutex);
1831 pthread_mutex_unlock(&mesh->mutex);
1836 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1837 if(!mesh || !node) {
1838 meshlink_errno = MESHLINK_EINVAL;
1842 pthread_mutex_lock(&mesh->mutex);
1844 node_t *n = (node_t *)node;
1846 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1847 meshlink_errno = MESHLINK_EINTERNAL;
1848 pthread_mutex_unlock(&mesh->mutex);
1852 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1855 meshlink_errno = MESHLINK_EINTERNAL;
1858 pthread_mutex_unlock(&mesh->mutex);
1862 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1864 meshlink_errno = MESHLINK_EINVAL;
1868 return (meshlink_node_t *)mesh->self;
1871 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1872 if(!mesh || !name) {
1873 meshlink_errno = MESHLINK_EINVAL;
1877 meshlink_node_t *node = NULL;
1879 pthread_mutex_lock(&mesh->mutex);
1880 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1881 pthread_mutex_unlock(&mesh->mutex);
1884 meshlink_errno = MESHLINK_ENOENT;
1890 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
1891 if(!mesh || !name) {
1892 meshlink_errno = MESHLINK_EINVAL;
1896 meshlink_submesh_t *submesh = NULL;
1898 pthread_mutex_lock(&mesh->mutex);
1899 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
1900 pthread_mutex_unlock(&mesh->mutex);
1903 meshlink_errno = MESHLINK_ENOENT;
1909 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1910 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1911 meshlink_errno = MESHLINK_EINVAL;
1915 meshlink_node_t **result;
1918 pthread_mutex_lock(&mesh->mutex);
1920 *nmemb = mesh->nodes->count;
1921 result = realloc(nodes, *nmemb * sizeof(*nodes));
1924 meshlink_node_t **p = result;
1926 for splay_each(node_t, n, mesh->nodes) {
1927 *p++ = (meshlink_node_t *)n;
1932 meshlink_errno = MESHLINK_ENOMEM;
1935 pthread_mutex_unlock(&mesh->mutex);
1940 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) {
1941 meshlink_node_t **result;
1943 pthread_mutex_lock(&mesh->mutex);
1947 for splay_each(node_t, n, mesh->nodes) {
1948 if(true == search_node(n, condition)) {
1949 *nmemb = *nmemb + 1;
1955 pthread_mutex_unlock(&mesh->mutex);
1959 result = realloc(nodes, *nmemb * sizeof(*nodes));
1962 meshlink_node_t **p = result;
1964 for splay_each(node_t, n, mesh->nodes) {
1965 if(true == search_node(n, condition)) {
1966 *p++ = (meshlink_node_t *)n;
1972 meshlink_errno = MESHLINK_ENOMEM;
1975 pthread_mutex_unlock(&mesh->mutex);
1980 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1981 dev_class_t *devclass = (dev_class_t *)condition;
1983 if(*devclass == (dev_class_t)node->devclass) {
1990 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1991 if(condition == node->submesh) {
1998 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) {
1999 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2000 meshlink_errno = MESHLINK_EINVAL;
2004 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2007 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2008 if(!mesh || !submesh || !nmemb) {
2009 meshlink_errno = MESHLINK_EINVAL;
2013 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2016 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2017 if(!mesh || !node) {
2018 meshlink_errno = MESHLINK_EINVAL;
2022 dev_class_t devclass;
2024 pthread_mutex_lock(&mesh->mutex);
2026 devclass = ((node_t *)node)->devclass;
2028 pthread_mutex_unlock(&mesh->mutex);
2033 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2034 if(!mesh || !node) {
2035 meshlink_errno = MESHLINK_EINVAL;
2039 node_t *n = (node_t *)node;
2041 meshlink_submesh_t *s;
2043 s = (meshlink_submesh_t *)n->submesh;
2048 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2049 if(!mesh || !data || !len || !signature || !siglen) {
2050 meshlink_errno = MESHLINK_EINVAL;
2054 if(*siglen < MESHLINK_SIGLEN) {
2055 meshlink_errno = MESHLINK_EINVAL;
2059 pthread_mutex_lock(&mesh->mutex);
2061 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2062 meshlink_errno = MESHLINK_EINTERNAL;
2063 pthread_mutex_unlock(&mesh->mutex);
2067 *siglen = MESHLINK_SIGLEN;
2068 pthread_mutex_unlock(&mesh->mutex);
2072 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2073 if(!mesh || !data || !len || !signature) {
2074 meshlink_errno = MESHLINK_EINVAL;
2078 if(siglen != MESHLINK_SIGLEN) {
2079 meshlink_errno = MESHLINK_EINVAL;
2083 pthread_mutex_lock(&mesh->mutex);
2087 struct node_t *n = (struct node_t *)source;
2089 if(!node_read_public_key(mesh, n)) {
2090 meshlink_errno = MESHLINK_EINTERNAL;
2093 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2096 pthread_mutex_unlock(&mesh->mutex);
2100 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2101 pthread_mutex_lock(&mesh->mutex);
2103 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2106 // TODO: Update invitation key if necessary?
2109 pthread_mutex_unlock(&mesh->mutex);
2111 return mesh->invitation_key;
2114 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2115 if(!mesh || !node || !address) {
2116 meshlink_errno = MESHLINK_EINVAL;
2120 if(!is_valid_hostname(address)) {
2121 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2122 meshlink_errno = MESHLINK_EINVAL;
2126 if(port && !is_valid_port(port)) {
2127 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2128 meshlink_errno = MESHLINK_EINVAL;
2132 char *canonical_address;
2135 xasprintf(&canonical_address, "%s %s", address, port);
2137 canonical_address = xstrdup(address);
2140 pthread_mutex_lock(&mesh->mutex);
2142 node_t *n = (node_t *)node;
2143 free(n->canonical_address);
2144 n->canonical_address = canonical_address;
2145 node_write_config(mesh, n);
2147 pthread_mutex_unlock(&mesh->mutex);
2152 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2153 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2156 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2158 meshlink_errno = MESHLINK_EINVAL;
2162 char *address = meshlink_get_external_address(mesh);
2168 bool rval = meshlink_add_address(mesh, address);
2174 int meshlink_get_port(meshlink_handle_t *mesh) {
2176 meshlink_errno = MESHLINK_EINVAL;
2181 meshlink_errno = MESHLINK_EINTERNAL;
2187 pthread_mutex_lock(&mesh->mutex);
2188 port = atoi(mesh->myport);
2189 pthread_mutex_unlock(&mesh->mutex);
2194 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2195 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2196 meshlink_errno = MESHLINK_EINVAL;
2200 if(mesh->myport && port == atoi(mesh->myport)) {
2204 if(!try_bind(port)) {
2205 meshlink_errno = MESHLINK_ENETWORK;
2209 devtool_trybind_probe();
2213 pthread_mutex_lock(&mesh->mutex);
2215 if(mesh->threadstarted) {
2216 meshlink_errno = MESHLINK_EINVAL;
2221 xasprintf(&mesh->myport, "%d", port);
2223 /* Close down the network. This also deletes mesh->self. */
2224 close_network_connections(mesh);
2226 /* Recreate mesh->self. */
2227 mesh->self = new_node();
2228 mesh->self->name = xstrdup(mesh->name);
2229 mesh->self->devclass = mesh->devclass;
2230 mesh->self->session_id = mesh->session_id;
2231 xasprintf(&mesh->myport, "%d", port);
2233 if(!node_read_public_key(mesh, mesh->self)) {
2234 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2235 meshlink_errno = MESHLINK_ESTORAGE;
2236 free_node(mesh->self);
2239 } else if(!setup_network(mesh)) {
2240 meshlink_errno = MESHLINK_ENETWORK;
2244 /* Rebuild our own list of recent addresses */
2245 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2246 add_local_addresses(mesh);
2248 /* Write meshlink.conf with the updated port number */
2249 write_main_config_files(mesh);
2251 rval = config_sync(mesh, "current");
2254 pthread_mutex_unlock(&mesh->mutex);
2256 return rval && meshlink_get_port(mesh) == port;
2259 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2260 mesh->invitation_timeout = timeout;
2263 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2264 meshlink_submesh_t *s = NULL;
2267 meshlink_errno = MESHLINK_EINVAL;
2272 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2275 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2276 meshlink_errno = MESHLINK_EINVAL;
2280 s = (meshlink_submesh_t *)mesh->self->submesh;
2283 pthread_mutex_lock(&mesh->mutex);
2285 // Check validity of the new node's name
2286 if(!check_id(name)) {
2287 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2288 meshlink_errno = MESHLINK_EINVAL;
2289 pthread_mutex_unlock(&mesh->mutex);
2293 // Ensure no host configuration file with that name exists
2294 if(config_exists(mesh, "current", name)) {
2295 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2296 meshlink_errno = MESHLINK_EEXIST;
2297 pthread_mutex_unlock(&mesh->mutex);
2301 // Ensure no other nodes know about this name
2302 if(meshlink_get_node(mesh, name)) {
2303 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2304 meshlink_errno = MESHLINK_EEXIST;
2305 pthread_mutex_unlock(&mesh->mutex);
2309 // Get the local address
2310 char *address = get_my_hostname(mesh, flags);
2313 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2314 meshlink_errno = MESHLINK_ERESOLV;
2315 pthread_mutex_unlock(&mesh->mutex);
2319 if(!refresh_invitation_key(mesh)) {
2320 meshlink_errno = MESHLINK_EINTERNAL;
2321 pthread_mutex_unlock(&mesh->mutex);
2327 // Create a hash of the key.
2328 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2329 sha512(fingerprint, strlen(fingerprint), hash);
2330 b64encode_urlsafe(hash, hash, 18);
2332 // Create a random cookie for this invitation.
2334 randomize(cookie, 18);
2336 // Create a filename that doesn't reveal the cookie itself
2337 char buf[18 + strlen(fingerprint)];
2338 char cookiehash[64];
2339 memcpy(buf, cookie, 18);
2340 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2341 sha512(buf, sizeof(buf), cookiehash);
2342 b64encode_urlsafe(cookiehash, cookiehash, 18);
2344 b64encode_urlsafe(cookie, cookie, 18);
2348 /* Construct the invitation file */
2349 uint8_t outbuf[4096];
2350 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2352 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2353 packmsg_add_str(&inv, name);
2354 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2355 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2357 /* TODO: Add several host config files to bootstrap connections.
2358 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2359 * and are not blacklisted.
2361 config_t configs[5];
2362 memset(configs, 0, sizeof(configs));
2365 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2369 /* Append host config files to the invitation file */
2370 packmsg_add_array(&inv, count);
2372 for(int i = 0; i < count; i++) {
2373 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2374 config_free(&configs[i]);
2377 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2379 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2380 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2381 meshlink_errno = MESHLINK_ESTORAGE;
2382 pthread_mutex_unlock(&mesh->mutex);
2386 // Create an URL from the local address, key hash and cookie
2388 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2391 pthread_mutex_unlock(&mesh->mutex);
2395 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2396 return meshlink_invite_ex(mesh, submesh, name, 0);
2399 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2400 if(!mesh || !invitation) {
2401 meshlink_errno = MESHLINK_EINVAL;
2405 pthread_mutex_lock(&mesh->mutex);
2407 //Before doing meshlink_join make sure we are not connected to another mesh
2408 if(mesh->threadstarted) {
2409 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2410 meshlink_errno = MESHLINK_EINVAL;
2411 pthread_mutex_unlock(&mesh->mutex);
2415 // 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.
2416 if(mesh->nodes->count > 1) {
2417 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2418 meshlink_errno = MESHLINK_EINVAL;
2419 pthread_mutex_unlock(&mesh->mutex);
2423 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2424 char copy[strlen(invitation) + 1];
2425 strcpy(copy, invitation);
2427 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2429 char *slash = strchr(copy, '/');
2437 if(strlen(slash) != 48) {
2441 char *address = copy;
2444 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2448 // Generate a throw-away key for the invitation.
2449 ecdsa_t *key = ecdsa_generate();
2452 meshlink_errno = MESHLINK_EINTERNAL;
2453 pthread_mutex_unlock(&mesh->mutex);
2457 char *b64key = ecdsa_get_base64_public_key(key);
2461 while(address && *address) {
2462 // We allow commas in the address part to support multiple addresses in one invitation URL.
2463 comma = strchr(address, ',');
2469 // Split of the port
2470 port = strrchr(address, ':');
2478 // IPv6 address are enclosed in brackets, per RFC 3986
2479 if(*address == '[') {
2481 char *bracket = strchr(address, ']');
2494 // Connect to the meshlink daemon mentioned in the URL.
2495 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2498 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2499 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2501 if(mesh->sock == -1) {
2502 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2503 meshlink_errno = MESHLINK_ENETWORK;
2507 set_timeout(mesh->sock, 5000);
2509 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2510 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2511 meshlink_errno = MESHLINK_ENETWORK;
2512 closesocket(mesh->sock);
2520 meshlink_errno = MESHLINK_ERESOLV;
2523 if(mesh->sock != -1 || !comma) {
2530 if(mesh->sock == -1) {
2531 pthread_mutex_unlock(&mesh->mutex);
2535 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2537 // Tell him we have an invitation, and give him our throw-away key.
2541 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2542 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2543 closesocket(mesh->sock);
2544 meshlink_errno = MESHLINK_ENETWORK;
2545 pthread_mutex_unlock(&mesh->mutex);
2551 char hisname[4096] = "";
2552 int code, hismajor, hisminor = 0;
2554 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) {
2555 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2556 closesocket(mesh->sock);
2557 meshlink_errno = MESHLINK_ENETWORK;
2558 pthread_mutex_unlock(&mesh->mutex);
2562 // Check if the hash of the key he gave us matches the hash in the URL.
2563 char *fingerprint = mesh->line + 2;
2566 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2567 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2568 meshlink_errno = MESHLINK_EINTERNAL;
2569 pthread_mutex_unlock(&mesh->mutex);
2573 if(memcmp(hishash, mesh->hash, 18)) {
2574 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2575 meshlink_errno = MESHLINK_EPEER;
2576 pthread_mutex_unlock(&mesh->mutex);
2581 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2584 meshlink_errno = MESHLINK_EINTERNAL;
2585 pthread_mutex_unlock(&mesh->mutex);
2589 // Start an SPTPS session
2590 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2591 meshlink_errno = MESHLINK_EINTERNAL;
2592 pthread_mutex_unlock(&mesh->mutex);
2596 // Feed rest of input buffer to SPTPS
2597 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2598 meshlink_errno = MESHLINK_EPEER;
2599 pthread_mutex_unlock(&mesh->mutex);
2605 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2607 if(errno == EINTR) {
2611 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2612 meshlink_errno = MESHLINK_ENETWORK;
2613 pthread_mutex_unlock(&mesh->mutex);
2617 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2618 meshlink_errno = MESHLINK_EPEER;
2619 pthread_mutex_unlock(&mesh->mutex);
2624 sptps_stop(&mesh->sptps);
2627 closesocket(mesh->sock);
2629 if(!mesh->success) {
2630 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2631 meshlink_errno = MESHLINK_EPEER;
2632 pthread_mutex_unlock(&mesh->mutex);
2636 pthread_mutex_unlock(&mesh->mutex);
2640 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2641 meshlink_errno = MESHLINK_EINVAL;
2642 pthread_mutex_unlock(&mesh->mutex);
2646 char *meshlink_export(meshlink_handle_t *mesh) {
2648 meshlink_errno = MESHLINK_EINVAL;
2652 // Create a config file on the fly.
2655 packmsg_output_t out = {buf, sizeof(buf)};
2656 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2657 packmsg_add_str(&out, mesh->name);
2658 packmsg_add_str(&out, CORE_MESH);
2660 pthread_mutex_lock(&mesh->mutex);
2662 packmsg_add_int32(&out, mesh->self->devclass);
2663 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2664 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2665 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2669 for(uint32_t i = 0; i < 5; i++) {
2670 if(mesh->self->recent[i].sa.sa_family) {
2677 packmsg_add_array(&out, count);
2679 for(uint32_t i = 0; i < count; i++) {
2680 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2683 pthread_mutex_unlock(&mesh->mutex);
2685 if(!packmsg_output_ok(&out)) {
2686 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2687 meshlink_errno = MESHLINK_EINTERNAL;
2691 // Prepare a base64-encoded packmsg array containing our config file
2693 uint32_t len = packmsg_output_size(&out, buf);
2694 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2695 uint8_t *buf2 = xmalloc(len2);
2696 packmsg_output_t out2 = {buf2, len2};
2697 packmsg_add_array(&out2, 1);
2698 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2700 if(!packmsg_output_ok(&out2)) {
2701 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2702 meshlink_errno = MESHLINK_EINTERNAL;
2707 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2709 return (char *)buf2;
2712 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2713 if(!mesh || !data) {
2714 meshlink_errno = MESHLINK_EINVAL;
2718 size_t datalen = strlen(data);
2719 uint8_t *buf = xmalloc(datalen);
2720 int buflen = b64decode(data, buf, datalen);
2723 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2724 meshlink_errno = MESHLINK_EPEER;
2728 packmsg_input_t in = {buf, buflen};
2729 uint32_t count = packmsg_get_array(&in);
2732 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2733 meshlink_errno = MESHLINK_EPEER;
2737 pthread_mutex_lock(&mesh->mutex);
2741 uint32_t len = packmsg_get_bin_raw(&in, &data);
2747 packmsg_input_t in2 = {data, len};
2748 uint32_t version = packmsg_get_uint32(&in2);
2749 char *name = packmsg_get_str_dup(&in2);
2751 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2753 packmsg_input_invalidate(&in);
2757 if(!check_id(name)) {
2762 node_t *n = lookup_node(mesh, name);
2765 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2773 config_t config = {data, len};
2775 if(!node_read_from_config(mesh, n, &config)) {
2777 packmsg_input_invalidate(&in);
2781 config_write(mesh, "current", n->name, &config, mesh->config_key);
2785 pthread_mutex_unlock(&mesh->mutex);
2789 if(!packmsg_done(&in)) {
2790 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2791 meshlink_errno = MESHLINK_EPEER;
2795 if(!config_sync(mesh, "current")) {
2802 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2803 if(!mesh || !node) {
2804 meshlink_errno = MESHLINK_EINVAL;
2808 pthread_mutex_lock(&mesh->mutex);
2813 if(n == mesh->self) {
2814 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2815 meshlink_errno = MESHLINK_EINVAL;
2816 pthread_mutex_unlock(&mesh->mutex);
2820 if(n->status.blacklisted) {
2821 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2822 pthread_mutex_unlock(&mesh->mutex);
2826 n->status.blacklisted = true;
2827 node_write_config(mesh, n);
2828 config_sync(mesh, "current");
2830 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2832 //Immediately terminate any connections we have with the blacklisted node
2833 for list_each(connection_t, c, mesh->connections) {
2835 terminate_connection(mesh, c, c->status.active);
2839 utcp_abort_all_connections(n->utcp);
2845 n->status.udp_confirmed = false;
2847 if(n->status.reachable) {
2848 update_node_status(mesh, n);
2851 pthread_mutex_unlock(&mesh->mutex);
2854 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2855 if(!mesh || !node) {
2856 meshlink_errno = MESHLINK_EINVAL;
2860 pthread_mutex_lock(&mesh->mutex);
2862 node_t *n = (node_t *)node;
2864 if(!n->status.blacklisted) {
2865 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2866 meshlink_errno = MESHLINK_EINVAL;
2867 pthread_mutex_unlock(&mesh->mutex);
2871 n->status.blacklisted = false;
2872 node_write_config(mesh, n);
2873 config_sync(mesh, "current");
2875 if(n->status.reachable) {
2876 update_node_status(mesh, n);
2879 pthread_mutex_unlock(&mesh->mutex);
2883 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2884 mesh->default_blacklist = blacklist;
2887 /* Hint that a hostname may be found at an address
2888 * See header file for detailed comment.
2890 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2891 if(!mesh || !node || !addr) {
2892 meshlink_errno = EINVAL;
2896 pthread_mutex_lock(&mesh->mutex);
2898 node_t *n = (node_t *)node;
2899 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2900 memcpy(n->recent, addr, SALEN(*addr));
2901 node_write_config(mesh, n);
2903 pthread_mutex_unlock(&mesh->mutex);
2904 // @TODO do we want to fire off a connection attempt right away?
2907 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2909 node_t *n = utcp->priv;
2910 meshlink_handle_t *mesh = n->mesh;
2911 return mesh->channel_accept_cb;
2914 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
2916 if(aio->cb.buffer) {
2917 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
2921 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
2926 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2927 meshlink_channel_t *channel = connection->priv;
2933 node_t *n = channel->node;
2934 meshlink_handle_t *mesh = n->mesh;
2936 if(n->status.destroyed) {
2937 meshlink_channel_close(mesh, channel);
2941 const char *p = data;
2944 while(channel->aio_receive) {
2945 meshlink_aio_buffer_t *aio = channel->aio_receive;
2946 size_t todo = aio->len - aio->done;
2953 memcpy((char *)aio->data + aio->done, p, todo);
2955 ssize_t result = write(aio->fd, p, todo);
2964 if(aio->done == aio->len) {
2965 channel->aio_receive = aio->next;
2966 aio_signal(mesh, channel, aio);
2978 if(channel->receive_cb) {
2979 channel->receive_cb(mesh, channel, p, left);
2985 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2986 node_t *n = utcp_connection->utcp->priv;
2992 meshlink_handle_t *mesh = n->mesh;
2994 if(!mesh->channel_accept_cb) {
2998 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3000 channel->c = utcp_connection;
3002 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3003 utcp_accept(utcp_connection, channel_recv, channel);
3009 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3010 node_t *n = utcp->priv;
3012 if(n->status.destroyed) {
3016 meshlink_handle_t *mesh = n->mesh;
3017 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3020 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3021 if(!mesh || !channel) {
3022 meshlink_errno = MESHLINK_EINVAL;
3026 channel->receive_cb = cb;
3029 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3031 node_t *n = (node_t *)source;
3037 utcp_recv(n->utcp, data, len);
3040 static void channel_poll(struct utcp_connection *connection, size_t len) {
3041 meshlink_channel_t *channel = connection->priv;
3047 node_t *n = channel->node;
3048 meshlink_handle_t *mesh = n->mesh;
3049 meshlink_aio_buffer_t *aio = channel->aio_send;
3052 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3053 size_t left = aio->len - aio->done;
3061 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3064 size_t todo = utcp_get_sndbuf_free(connection);
3070 if(todo > sizeof(buf)) {
3074 ssize_t result = read(aio->fd, buf, todo);
3077 sent = utcp_send(connection, buf, result);
3087 /* If the buffer is now completely sent, call the callback and dispose of it. */
3088 if(aio->done >= aio->len) {
3089 channel->aio_send = aio->next;
3090 aio_signal(mesh, channel, aio);
3094 if(channel->poll_cb) {
3095 channel->poll_cb(mesh, channel, len);
3097 utcp_set_poll_cb(connection, NULL);
3102 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3103 if(!mesh || !channel) {
3104 meshlink_errno = MESHLINK_EINVAL;
3108 pthread_mutex_lock(&mesh->mutex);
3109 channel->poll_cb = cb;
3110 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3111 pthread_mutex_unlock(&mesh->mutex);
3114 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3116 meshlink_errno = MESHLINK_EINVAL;
3120 pthread_mutex_lock(&mesh->mutex);
3121 mesh->channel_accept_cb = cb;
3122 mesh->receive_cb = channel_receive;
3124 for splay_each(node_t, n, mesh->nodes) {
3125 if(!n->utcp && n != mesh->self) {
3126 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3130 pthread_mutex_unlock(&mesh->mutex);
3133 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3137 meshlink_errno = MESHLINK_EINVAL;
3141 pthread_mutex_lock(&mesh->mutex);
3142 utcp_set_sndbuf(channel->c, size);
3143 pthread_mutex_unlock(&mesh->mutex);
3146 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3150 meshlink_errno = MESHLINK_EINVAL;
3154 pthread_mutex_lock(&mesh->mutex);
3155 utcp_set_rcvbuf(channel->c, size);
3156 pthread_mutex_unlock(&mesh->mutex);
3159 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) {
3161 abort(); // TODO: handle non-NULL data
3164 if(!mesh || !node) {
3165 meshlink_errno = MESHLINK_EINVAL;
3169 pthread_mutex_lock(&mesh->mutex);
3171 node_t *n = (node_t *)node;
3174 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3175 mesh->receive_cb = channel_receive;
3178 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3179 pthread_mutex_unlock(&mesh->mutex);
3184 if(n->status.blacklisted) {
3185 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3186 pthread_mutex_unlock(&mesh->mutex);
3190 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3192 channel->receive_cb = cb;
3195 channel->priv = (void *)data;
3198 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3200 pthread_mutex_unlock(&mesh->mutex);
3203 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3211 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) {
3212 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3215 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3216 if(!mesh || !channel) {
3217 meshlink_errno = MESHLINK_EINVAL;
3221 pthread_mutex_lock(&mesh->mutex);
3222 utcp_shutdown(channel->c, direction);
3223 pthread_mutex_unlock(&mesh->mutex);
3226 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3227 if(!mesh || !channel) {
3228 meshlink_errno = MESHLINK_EINVAL;
3232 pthread_mutex_lock(&mesh->mutex);
3234 utcp_close(channel->c);
3236 /* Clean up any outstanding AIO buffers. */
3237 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3239 aio_signal(mesh, channel, aio);
3243 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3245 aio_signal(mesh, channel, aio);
3249 pthread_mutex_unlock(&mesh->mutex);
3254 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3255 if(!mesh || !channel) {
3256 meshlink_errno = MESHLINK_EINVAL;
3265 meshlink_errno = MESHLINK_EINVAL;
3269 // TODO: more finegrained locking.
3270 // Ideally we want to put the data into the UTCP connection's send buffer.
3271 // Then, preferably only if there is room in the receiver window,
3272 // kick the meshlink thread to go send packets.
3276 pthread_mutex_lock(&mesh->mutex);
3278 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3279 if(channel->aio_send) {
3282 retval = utcp_send(channel->c, data, len);
3285 pthread_mutex_unlock(&mesh->mutex);
3288 meshlink_errno = MESHLINK_ENETWORK;
3294 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) {
3295 if(!mesh || !channel) {
3296 meshlink_errno = MESHLINK_EINVAL;
3301 meshlink_errno = MESHLINK_EINVAL;
3305 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3308 aio->cb.buffer = cb;
3311 pthread_mutex_lock(&mesh->mutex);
3313 /* Append the AIO buffer descriptor to the end of the chain */
3314 meshlink_aio_buffer_t **p = &channel->aio_send;
3322 /* Ensure the poll callback is set, and call it right now to push data if possible */
3323 utcp_set_poll_cb(channel->c, channel_poll);
3324 channel_poll(channel->c, len);
3326 pthread_mutex_unlock(&mesh->mutex);
3331 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) {
3332 if(!mesh || !channel) {
3333 meshlink_errno = MESHLINK_EINVAL;
3337 if(!len || fd == -1) {
3338 meshlink_errno = MESHLINK_EINVAL;
3342 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3348 pthread_mutex_lock(&mesh->mutex);
3350 /* Append the AIO buffer descriptor to the end of the chain */
3351 meshlink_aio_buffer_t **p = &channel->aio_send;
3359 /* Ensure the poll callback is set, and call it right now to push data if possible */
3360 utcp_set_poll_cb(channel->c, channel_poll);
3361 channel_poll(channel->c, len);
3363 pthread_mutex_unlock(&mesh->mutex);
3368 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) {
3369 if(!mesh || !channel) {
3370 meshlink_errno = MESHLINK_EINVAL;
3375 meshlink_errno = MESHLINK_EINVAL;
3379 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3382 aio->cb.buffer = cb;
3385 pthread_mutex_lock(&mesh->mutex);
3387 /* Append the AIO buffer descriptor to the end of the chain */
3388 meshlink_aio_buffer_t **p = &channel->aio_receive;
3396 pthread_mutex_unlock(&mesh->mutex);
3401 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) {
3402 if(!mesh || !channel) {
3403 meshlink_errno = MESHLINK_EINVAL;
3407 if(!len || fd == -1) {
3408 meshlink_errno = MESHLINK_EINVAL;
3412 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3418 pthread_mutex_lock(&mesh->mutex);
3420 /* Append the AIO buffer descriptor to the end of the chain */
3421 meshlink_aio_buffer_t **p = &channel->aio_receive;
3429 pthread_mutex_unlock(&mesh->mutex);
3434 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3435 if(!mesh || !channel) {
3436 meshlink_errno = MESHLINK_EINVAL;
3440 return channel->c->flags;
3443 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3444 if(!mesh || !channel) {
3445 meshlink_errno = MESHLINK_EINVAL;
3449 return utcp_get_sendq(channel->c);
3452 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3453 if(!mesh || !channel) {
3454 meshlink_errno = MESHLINK_EINVAL;
3458 return utcp_get_recvq(channel->c);
3461 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3462 if(!mesh || !node) {
3463 meshlink_errno = MESHLINK_EINVAL;
3467 node_t *n = (node_t *)node;
3469 pthread_mutex_lock(&mesh->mutex);
3472 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3475 utcp_set_user_timeout(n->utcp, timeout);
3477 pthread_mutex_unlock(&mesh->mutex);
3480 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3481 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3482 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3485 if(mesh->node_status_cb) {
3486 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3489 if(mesh->node_pmtu_cb) {
3490 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3494 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3495 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3496 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3500 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3501 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3505 n->status.duplicate = true;
3506 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3509 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3513 meshlink_errno = MESHLINK_EINVAL;
3517 pthread_mutex_lock(&mesh->mutex);
3519 if(mesh->discovery == enable) {
3523 if(mesh->threadstarted) {
3525 discovery_start(mesh);
3527 discovery_stop(mesh);
3531 mesh->discovery = enable;
3534 pthread_mutex_unlock(&mesh->mutex);
3538 meshlink_errno = MESHLINK_ENOTSUP;
3542 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3543 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3544 meshlink_errno = EINVAL;
3548 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3549 meshlink_errno = EINVAL;
3553 pthread_mutex_lock(&mesh->mutex);
3554 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3555 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3556 pthread_mutex_unlock(&mesh->mutex);
3559 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3562 if(!mesh->connections || !mesh->loop.running) {
3569 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
3570 // We should only call the callback function if we are in the background thread.
3571 if(!mesh->error_cb) {
3575 if(!mesh->threadstarted) {
3579 if(mesh->thread == pthread_self()) {
3580 mesh->error_cb(mesh, meshlink_errno);
3585 static void __attribute__((constructor)) meshlink_init(void) {
3589 static void __attribute__((destructor)) meshlink_exit(void) {