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",
799 [MESHLINK_EBLACKLISTED] = "Node is blacklisted",
802 const char *meshlink_strerror(meshlink_errno_t err) {
803 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
804 return "Invalid error code";
810 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
811 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
813 mesh->private_key = ecdsa_generate();
814 mesh->invitation_key = ecdsa_generate();
816 if(!mesh->private_key || !mesh->invitation_key) {
817 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
818 meshlink_errno = MESHLINK_EINTERNAL;
822 logger(mesh, MESHLINK_DEBUG, "Done.\n");
827 static struct timeval idle(event_loop_t *loop, void *data) {
829 meshlink_handle_t *mesh = data;
830 struct timeval t, tmin = {3600, 0};
832 for splay_each(node_t, n, mesh->nodes) {
837 t = utcp_timeout(n->utcp);
839 if(timercmp(&t, &tmin, <)) {
847 // Get our local address(es) by simulating connecting to an Internet host.
848 static void add_local_addresses(meshlink_handle_t *mesh) {
849 struct sockaddr_storage sn;
850 sn.ss_family = AF_UNKNOWN;
851 socklen_t sl = sizeof(sn);
855 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
856 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
857 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
864 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
865 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
866 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
870 static bool meshlink_setup(meshlink_handle_t *mesh) {
871 if(!config_init(mesh, "current")) {
872 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
873 meshlink_errno = MESHLINK_ESTORAGE;
877 if(!ecdsa_keygen(mesh)) {
878 meshlink_errno = MESHLINK_EINTERNAL;
882 if(check_port(mesh) == 0) {
883 meshlink_errno = MESHLINK_ENETWORK;
887 /* Create a node for ourself */
889 mesh->self = new_node();
890 mesh->self->name = xstrdup(mesh->name);
891 mesh->self->devclass = mesh->devclass;
892 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
893 mesh->self->session_id = mesh->session_id;
895 if(!write_main_config_files(mesh)) {
896 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
897 meshlink_errno = MESHLINK_ESTORAGE;
901 /* Ensure the configuration directory metadata is on disk */
902 if(!config_sync(mesh, "current")) {
906 if(!main_config_lock(mesh)) {
907 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
908 meshlink_errno = MESHLINK_ESTORAGE;
915 static bool meshlink_read_config(meshlink_handle_t *mesh) {
916 // Open the configuration file and lock it
917 if(!main_config_lock(mesh)) {
918 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
919 meshlink_errno = MESHLINK_ESTORAGE;
925 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
926 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
930 packmsg_input_t in = {config.buf, config.len};
931 const void *private_key;
932 const void *invitation_key;
934 uint32_t version = packmsg_get_uint32(&in);
935 char *name = packmsg_get_str_dup(&in);
936 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
937 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
938 uint16_t myport = packmsg_get_uint16(&in);
940 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
941 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
943 config_free(&config);
950 if(mesh->name && strcmp(mesh->name, name)) {
951 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
952 meshlink_errno = MESHLINK_ESTORAGE;
954 config_free(&config);
962 xasprintf(&mesh->myport, "%u", myport);
963 mesh->private_key = ecdsa_set_private_key(private_key);
964 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
965 config_free(&config);
967 /* Create a node for ourself and read our host configuration file */
969 mesh->self = new_node();
970 mesh->self->name = xstrdup(name);
971 mesh->self->devclass = mesh->devclass;
972 mesh->self->session_id = mesh->session_id;
974 if(!node_read_public_key(mesh, mesh->self)) {
975 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
976 meshlink_errno = MESHLINK_ESTORAGE;
977 free_node(mesh->self);
986 static void *setup_network_in_netns_thread(void *arg) {
987 meshlink_handle_t *mesh = arg;
989 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
993 bool success = setup_network(mesh);
994 add_local_addresses(mesh);
995 return success ? arg : NULL;
999 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1000 if(!confbase || !*confbase) {
1001 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1002 meshlink_errno = MESHLINK_EINVAL;
1006 if(!appname || !*appname) {
1007 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1008 meshlink_errno = MESHLINK_EINVAL;
1012 if(strchr(appname, ' ')) {
1013 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1014 meshlink_errno = MESHLINK_EINVAL;
1018 if(!name || !*name) {
1019 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1020 meshlink_errno = MESHLINK_EINVAL;
1024 if(!check_id(name)) {
1025 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1026 meshlink_errno = MESHLINK_EINVAL;
1030 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1031 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1032 meshlink_errno = MESHLINK_EINVAL;
1036 meshlink_open_params_t *params = xzalloc(sizeof * params);
1038 params->confbase = xstrdup(confbase);
1039 params->name = xstrdup(name);
1040 params->appname = xstrdup(appname);
1041 params->devclass = devclass;
1047 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1049 meshlink_errno = MESHLINK_EINVAL;
1053 params->netns = netns;
1058 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1060 meshlink_errno = MESHLINK_EINVAL;
1064 if((!key && keylen) || (key && !keylen)) {
1065 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1066 meshlink_errno = MESHLINK_EINVAL;
1071 params->keylen = keylen;
1076 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1077 if(!mesh || !new_key || !new_keylen) {
1078 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1079 meshlink_errno = MESHLINK_EINVAL;
1083 pthread_mutex_lock(&mesh->mutex);
1085 // Create hash for the new key
1086 void *new_config_key;
1087 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1089 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1090 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1091 meshlink_errno = MESHLINK_EINTERNAL;
1092 pthread_mutex_unlock(&mesh->mutex);
1096 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1098 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1099 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1100 meshlink_errno = MESHLINK_ESTORAGE;
1101 pthread_mutex_unlock(&mesh->mutex);
1105 devtool_keyrotate_probe(1);
1107 main_config_unlock(mesh);
1109 // Rename confbase/current/ to confbase/old
1111 if(!config_rename(mesh, "current", "old")) {
1112 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1113 meshlink_errno = MESHLINK_ESTORAGE;
1114 main_config_lock(mesh);
1115 pthread_mutex_unlock(&mesh->mutex);
1119 devtool_keyrotate_probe(2);
1121 // Rename confbase/new/ to confbase/current
1123 if(!config_rename(mesh, "new", "current")) {
1124 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1125 meshlink_errno = MESHLINK_ESTORAGE;
1126 main_config_lock(mesh);
1127 pthread_mutex_unlock(&mesh->mutex);
1131 devtool_keyrotate_probe(3);
1133 if(!main_config_lock(mesh)) {
1134 pthread_mutex_unlock(&mesh->mutex);
1138 // Cleanup the "old" confbase sub-directory
1140 if(!config_destroy(mesh->confbase, "old")) {
1141 pthread_mutex_unlock(&mesh->mutex);
1145 // Change the mesh handle key with new key
1147 free(mesh->config_key);
1148 mesh->config_key = new_config_key;
1150 pthread_mutex_unlock(&mesh->mutex);
1155 void meshlink_open_params_free(meshlink_open_params_t *params) {
1157 meshlink_errno = MESHLINK_EINVAL;
1161 free(params->confbase);
1163 free(params->appname);
1168 /// Device class traits
1169 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1170 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1171 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1172 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1173 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1176 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1177 if(!confbase || !*confbase) {
1178 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1179 meshlink_errno = MESHLINK_EINVAL;
1183 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1184 meshlink_open_params_t params;
1185 memset(¶ms, 0, sizeof(params));
1187 params.confbase = (char *)confbase;
1188 params.name = (char *)name;
1189 params.appname = (char *)appname;
1190 params.devclass = devclass;
1193 return meshlink_open_ex(¶ms);
1196 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) {
1197 if(!confbase || !*confbase) {
1198 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1199 meshlink_errno = MESHLINK_EINVAL;
1203 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1204 meshlink_open_params_t params;
1205 memset(¶ms, 0, sizeof(params));
1207 params.confbase = (char *)confbase;
1208 params.name = (char *)name;
1209 params.appname = (char *)appname;
1210 params.devclass = devclass;
1213 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1217 return meshlink_open_ex(¶ms);
1220 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1221 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1222 meshlink_open_params_t params;
1223 memset(¶ms, 0, sizeof(params));
1225 params.name = (char *)name;
1226 params.appname = (char *)appname;
1227 params.devclass = devclass;
1230 return meshlink_open_ex(¶ms);
1233 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1234 // Validate arguments provided by the application
1235 bool usingname = false;
1237 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1239 if(!params->appname || !*params->appname) {
1240 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1241 meshlink_errno = MESHLINK_EINVAL;
1245 if(strchr(params->appname, ' ')) {
1246 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1247 meshlink_errno = MESHLINK_EINVAL;
1251 if(!params->name || !*params->name) {
1252 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1254 } else { //check name only if there is a name != NULL
1256 if(!check_id(params->name)) {
1257 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1258 meshlink_errno = MESHLINK_EINVAL;
1265 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1266 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1267 meshlink_errno = MESHLINK_EINVAL;
1271 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1272 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1273 meshlink_errno = MESHLINK_EINVAL;
1277 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1279 if(params->confbase) {
1280 mesh->confbase = xstrdup(params->confbase);
1283 mesh->appname = xstrdup(params->appname);
1284 mesh->devclass = params->devclass;
1285 mesh->discovery = true;
1286 mesh->invitation_timeout = 604800; // 1 week
1287 mesh->netns = params->netns;
1288 mesh->submeshes = NULL;
1289 mesh->log_cb = global_log_cb;
1290 mesh->log_level = global_log_level;
1292 randomize(&mesh->prng_state, sizeof(mesh->prng_state));
1295 randomize(&mesh->session_id, sizeof(mesh->session_id));
1296 } while(mesh->session_id == 0);
1298 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1301 mesh->name = xstrdup(params->name);
1306 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1308 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1309 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1310 meshlink_close(mesh);
1311 meshlink_errno = MESHLINK_EINTERNAL;
1317 pthread_mutexattr_t attr;
1318 pthread_mutexattr_init(&attr);
1319 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1320 pthread_mutex_init(&mesh->mutex, &attr);
1322 mesh->threadstarted = false;
1323 event_loop_init(&mesh->loop);
1324 mesh->loop.data = mesh;
1326 meshlink_queue_init(&mesh->outpacketqueue);
1328 // If no configuration exists yet, create it.
1330 if(!meshlink_confbase_exists(mesh)) {
1331 if(!meshlink_setup(mesh)) {
1332 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1333 meshlink_close(mesh);
1337 if(!meshlink_read_config(mesh)) {
1338 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1339 meshlink_close(mesh);
1345 struct WSAData wsa_state;
1346 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1349 // Setup up everything
1350 // TODO: we should not open listening sockets yet
1352 bool success = false;
1354 if(mesh->netns != -1) {
1358 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1359 void *retval = NULL;
1360 success = pthread_join(thr, &retval) == 0 && retval;
1364 meshlink_errno = MESHLINK_EINTERNAL;
1367 #endif // HAVE_SETNS
1369 success = setup_network(mesh);
1370 add_local_addresses(mesh);
1374 meshlink_close(mesh);
1375 meshlink_errno = MESHLINK_ENETWORK;
1379 add_local_addresses(mesh);
1380 node_write_config(mesh, mesh->self);
1382 idle_set(&mesh->loop, idle, mesh);
1384 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1388 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1389 meshlink_submesh_t *s = NULL;
1392 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1393 meshlink_errno = MESHLINK_EINVAL;
1397 if(!submesh || !*submesh) {
1398 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1399 meshlink_errno = MESHLINK_EINVAL;
1404 pthread_mutex_lock(&mesh->mutex);
1406 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1408 pthread_mutex_unlock(&mesh->mutex);
1413 static void *meshlink_main_loop(void *arg) {
1414 meshlink_handle_t *mesh = arg;
1416 if(mesh->netns != -1) {
1419 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1420 pthread_cond_signal(&mesh->cond);
1425 pthread_cond_signal(&mesh->cond);
1427 #endif // HAVE_SETNS
1432 if(mesh->discovery) {
1433 discovery_start(mesh);
1438 pthread_mutex_lock(&mesh->mutex);
1440 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1441 pthread_cond_broadcast(&mesh->cond);
1443 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1445 pthread_mutex_unlock(&mesh->mutex);
1450 if(mesh->discovery) {
1451 discovery_stop(mesh);
1459 bool meshlink_start(meshlink_handle_t *mesh) {
1461 assert(mesh->private_key);
1464 meshlink_errno = MESHLINK_EINVAL;
1468 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1470 pthread_mutex_lock(&mesh->mutex);
1472 assert(mesh->self->ecdsa);
1473 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1475 if(mesh->threadstarted) {
1476 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1477 pthread_mutex_unlock(&mesh->mutex);
1481 if(mesh->listen_socket[0].tcp.fd < 0) {
1482 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1483 meshlink_errno = MESHLINK_ENETWORK;
1487 mesh->thedatalen = 0;
1489 // TODO: open listening sockets first
1491 //Check that a valid name is set
1493 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1494 meshlink_errno = MESHLINK_EINVAL;
1495 pthread_mutex_unlock(&mesh->mutex);
1499 init_outgoings(mesh);
1501 // Start the main thread
1503 event_loop_start(&mesh->loop);
1505 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1506 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1507 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1508 meshlink_errno = MESHLINK_EINTERNAL;
1509 event_loop_stop(&mesh->loop);
1510 pthread_mutex_unlock(&mesh->mutex);
1514 pthread_cond_wait(&mesh->cond, &mesh->mutex);
1515 mesh->threadstarted = true;
1517 pthread_mutex_unlock(&mesh->mutex);
1521 void meshlink_stop(meshlink_handle_t *mesh) {
1523 meshlink_errno = MESHLINK_EINVAL;
1527 pthread_mutex_lock(&mesh->mutex);
1528 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1530 // Shut down the main thread
1531 event_loop_stop(&mesh->loop);
1533 // Send ourselves a UDP packet to kick the event loop
1534 for(int i = 0; i < mesh->listen_sockets; i++) {
1536 socklen_t salen = sizeof(sa.sa);
1538 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1539 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1543 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1544 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1548 if(mesh->threadstarted) {
1549 // Wait for the main thread to finish
1550 pthread_mutex_unlock(&mesh->mutex);
1551 pthread_join(mesh->thread, NULL);
1552 pthread_mutex_lock(&mesh->mutex);
1554 mesh->threadstarted = false;
1557 // Close all metaconnections
1558 if(mesh->connections) {
1559 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1561 connection_t *c = node->data;
1563 terminate_connection(mesh, c, false);
1567 exit_outgoings(mesh);
1569 // Write out any changed node config files
1571 for splay_each(node_t, n, mesh->nodes) {
1572 if(n->status.dirty) {
1573 node_write_config(mesh, n);
1574 n->status.dirty = false;
1579 pthread_mutex_unlock(&mesh->mutex);
1582 void meshlink_close(meshlink_handle_t *mesh) {
1584 meshlink_errno = MESHLINK_EINVAL;
1588 // stop can be called even if mesh has not been started
1589 meshlink_stop(mesh);
1591 // lock is not released after this
1592 pthread_mutex_lock(&mesh->mutex);
1594 // Close and free all resources used.
1596 close_network_connections(mesh);
1598 logger(mesh, MESHLINK_INFO, "Terminating");
1600 event_loop_exit(&mesh->loop);
1604 if(mesh->confbase) {
1610 ecdsa_free(mesh->invitation_key);
1612 if(mesh->netns != -1) {
1616 for(vpn_packet_t *packet; (packet = meshlink_queue_pop(&mesh->outpacketqueue));) {
1620 meshlink_queue_exit(&mesh->outpacketqueue);
1623 free(mesh->appname);
1624 free(mesh->confbase);
1625 free(mesh->config_key);
1626 ecdsa_free(mesh->private_key);
1628 main_config_unlock(mesh);
1630 pthread_mutex_unlock(&mesh->mutex);
1631 pthread_mutex_destroy(&mesh->mutex);
1633 memset(mesh, 0, sizeof(*mesh));
1638 bool meshlink_destroy(const char *confbase) {
1640 meshlink_errno = MESHLINK_EINVAL;
1644 if(!config_destroy(confbase, "current")) {
1645 logger(NULL, MESHLINK_ERROR, "Cannot remove confbase sub-directories %s: %s\n", confbase, strerror(errno));
1649 config_destroy(confbase, "new");
1650 config_destroy(confbase, "old");
1652 if(rmdir(confbase) && errno != ENOENT) {
1653 logger(NULL, MESHLINK_ERROR, "Cannot remove directory %s: %s\n", confbase, strerror(errno));
1654 meshlink_errno = MESHLINK_ESTORAGE;
1661 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1663 meshlink_errno = MESHLINK_EINVAL;
1667 pthread_mutex_lock(&mesh->mutex);
1668 mesh->receive_cb = cb;
1669 pthread_mutex_unlock(&mesh->mutex);
1672 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1674 meshlink_errno = MESHLINK_EINVAL;
1678 pthread_mutex_lock(&mesh->mutex);
1679 mesh->connection_try_cb = cb;
1680 pthread_mutex_unlock(&mesh->mutex);
1683 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1685 meshlink_errno = MESHLINK_EINVAL;
1689 pthread_mutex_lock(&mesh->mutex);
1690 mesh->node_status_cb = cb;
1691 pthread_mutex_unlock(&mesh->mutex);
1694 void meshlink_set_node_pmtu_cb(meshlink_handle_t *mesh, meshlink_node_pmtu_cb_t cb) {
1696 meshlink_errno = MESHLINK_EINVAL;
1700 pthread_mutex_lock(&mesh->mutex);
1701 mesh->node_pmtu_cb = cb;
1702 pthread_mutex_unlock(&mesh->mutex);
1705 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1707 meshlink_errno = MESHLINK_EINVAL;
1711 pthread_mutex_lock(&mesh->mutex);
1712 mesh->node_duplicate_cb = cb;
1713 pthread_mutex_unlock(&mesh->mutex);
1716 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1718 pthread_mutex_lock(&mesh->mutex);
1720 mesh->log_level = cb ? level : 0;
1721 pthread_mutex_unlock(&mesh->mutex);
1724 global_log_level = cb ? level : 0;
1728 void meshlink_set_error_cb(struct meshlink_handle *mesh, meshlink_error_cb_t cb) {
1730 meshlink_errno = MESHLINK_EINVAL;
1734 pthread_mutex_lock(&mesh->mutex);
1735 mesh->error_cb = cb;
1736 pthread_mutex_unlock(&mesh->mutex);
1739 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1740 meshlink_packethdr_t *hdr;
1742 // Validate arguments
1743 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1744 meshlink_errno = MESHLINK_EINVAL;
1753 meshlink_errno = MESHLINK_EINVAL;
1757 node_t *n = (node_t *)destination;
1759 if(n->status.blacklisted) {
1760 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1761 meshlink_errno = MESHLINK_EBLACKLISTED;
1765 // Prepare the packet
1766 vpn_packet_t *packet = malloc(sizeof(*packet));
1769 meshlink_errno = MESHLINK_ENOMEM;
1773 packet->probe = false;
1774 packet->tcp = false;
1775 packet->len = len + sizeof(*hdr);
1777 hdr = (meshlink_packethdr_t *)packet->data;
1778 memset(hdr, 0, sizeof(*hdr));
1779 // leave the last byte as 0 to make sure strings are always
1780 // null-terminated if they are longer than the buffer
1781 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1782 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1784 memcpy(packet->data + sizeof(*hdr), data, len);
1787 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1789 meshlink_errno = MESHLINK_ENOMEM;
1793 // Notify event loop
1794 signal_trigger(&mesh->loop, &mesh->datafromapp);
1799 void meshlink_send_from_queue(event_loop_t *loop, void *data) {
1801 meshlink_handle_t *mesh = data;
1802 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1808 mesh->self->in_packets++;
1809 mesh->self->in_bytes += packet->len;
1810 route(mesh, mesh->self, packet);
1815 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1816 if(!mesh || !destination) {
1817 meshlink_errno = MESHLINK_EINVAL;
1821 pthread_mutex_lock(&mesh->mutex);
1823 node_t *n = (node_t *)destination;
1825 if(!n->status.reachable) {
1826 pthread_mutex_unlock(&mesh->mutex);
1829 } else if(n->mtuprobes > 30 && n->minmtu) {
1830 pthread_mutex_unlock(&mesh->mutex);
1833 pthread_mutex_unlock(&mesh->mutex);
1838 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1839 if(!mesh || !node) {
1840 meshlink_errno = MESHLINK_EINVAL;
1844 pthread_mutex_lock(&mesh->mutex);
1846 node_t *n = (node_t *)node;
1848 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1849 meshlink_errno = MESHLINK_EINTERNAL;
1850 pthread_mutex_unlock(&mesh->mutex);
1854 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1857 meshlink_errno = MESHLINK_EINTERNAL;
1860 pthread_mutex_unlock(&mesh->mutex);
1864 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1866 meshlink_errno = MESHLINK_EINVAL;
1870 return (meshlink_node_t *)mesh->self;
1873 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1874 if(!mesh || !name) {
1875 meshlink_errno = MESHLINK_EINVAL;
1879 meshlink_node_t *node = NULL;
1881 pthread_mutex_lock(&mesh->mutex);
1882 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1883 pthread_mutex_unlock(&mesh->mutex);
1886 meshlink_errno = MESHLINK_ENOENT;
1892 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
1893 if(!mesh || !name) {
1894 meshlink_errno = MESHLINK_EINVAL;
1898 meshlink_submesh_t *submesh = NULL;
1900 pthread_mutex_lock(&mesh->mutex);
1901 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
1902 pthread_mutex_unlock(&mesh->mutex);
1905 meshlink_errno = MESHLINK_ENOENT;
1911 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1912 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1913 meshlink_errno = MESHLINK_EINVAL;
1917 meshlink_node_t **result;
1920 pthread_mutex_lock(&mesh->mutex);
1922 *nmemb = mesh->nodes->count;
1923 result = realloc(nodes, *nmemb * sizeof(*nodes));
1926 meshlink_node_t **p = result;
1928 for splay_each(node_t, n, mesh->nodes) {
1929 *p++ = (meshlink_node_t *)n;
1934 meshlink_errno = MESHLINK_ENOMEM;
1937 pthread_mutex_unlock(&mesh->mutex);
1942 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) {
1943 meshlink_node_t **result;
1945 pthread_mutex_lock(&mesh->mutex);
1949 for splay_each(node_t, n, mesh->nodes) {
1950 if(true == search_node(n, condition)) {
1951 *nmemb = *nmemb + 1;
1957 pthread_mutex_unlock(&mesh->mutex);
1961 result = realloc(nodes, *nmemb * sizeof(*nodes));
1964 meshlink_node_t **p = result;
1966 for splay_each(node_t, n, mesh->nodes) {
1967 if(true == search_node(n, condition)) {
1968 *p++ = (meshlink_node_t *)n;
1974 meshlink_errno = MESHLINK_ENOMEM;
1977 pthread_mutex_unlock(&mesh->mutex);
1982 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1983 dev_class_t *devclass = (dev_class_t *)condition;
1985 if(*devclass == (dev_class_t)node->devclass) {
1992 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1993 if(condition == node->submesh) {
2000 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) {
2001 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
2002 meshlink_errno = MESHLINK_EINVAL;
2006 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
2009 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
2010 if(!mesh || !submesh || !nmemb) {
2011 meshlink_errno = MESHLINK_EINVAL;
2015 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
2018 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
2019 if(!mesh || !node) {
2020 meshlink_errno = MESHLINK_EINVAL;
2024 dev_class_t devclass;
2026 pthread_mutex_lock(&mesh->mutex);
2028 devclass = ((node_t *)node)->devclass;
2030 pthread_mutex_unlock(&mesh->mutex);
2035 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
2036 if(!mesh || !node) {
2037 meshlink_errno = MESHLINK_EINVAL;
2041 node_t *n = (node_t *)node;
2043 meshlink_submesh_t *s;
2045 s = (meshlink_submesh_t *)n->submesh;
2050 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
2051 if(!mesh || !data || !len || !signature || !siglen) {
2052 meshlink_errno = MESHLINK_EINVAL;
2056 if(*siglen < MESHLINK_SIGLEN) {
2057 meshlink_errno = MESHLINK_EINVAL;
2061 pthread_mutex_lock(&mesh->mutex);
2063 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2064 meshlink_errno = MESHLINK_EINTERNAL;
2065 pthread_mutex_unlock(&mesh->mutex);
2069 *siglen = MESHLINK_SIGLEN;
2070 pthread_mutex_unlock(&mesh->mutex);
2074 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2075 if(!mesh || !data || !len || !signature) {
2076 meshlink_errno = MESHLINK_EINVAL;
2080 if(siglen != MESHLINK_SIGLEN) {
2081 meshlink_errno = MESHLINK_EINVAL;
2085 pthread_mutex_lock(&mesh->mutex);
2089 struct node_t *n = (struct node_t *)source;
2091 if(!node_read_public_key(mesh, n)) {
2092 meshlink_errno = MESHLINK_EINTERNAL;
2095 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2098 pthread_mutex_unlock(&mesh->mutex);
2102 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2103 pthread_mutex_lock(&mesh->mutex);
2105 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2108 // TODO: Update invitation key if necessary?
2111 pthread_mutex_unlock(&mesh->mutex);
2113 return mesh->invitation_key;
2116 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2117 if(!mesh || !node || !address) {
2118 meshlink_errno = MESHLINK_EINVAL;
2122 if(!is_valid_hostname(address)) {
2123 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2124 meshlink_errno = MESHLINK_EINVAL;
2128 if(port && !is_valid_port(port)) {
2129 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2130 meshlink_errno = MESHLINK_EINVAL;
2134 char *canonical_address;
2137 xasprintf(&canonical_address, "%s %s", address, port);
2139 canonical_address = xstrdup(address);
2142 pthread_mutex_lock(&mesh->mutex);
2144 node_t *n = (node_t *)node;
2145 free(n->canonical_address);
2146 n->canonical_address = canonical_address;
2147 node_write_config(mesh, n);
2149 pthread_mutex_unlock(&mesh->mutex);
2154 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2155 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2158 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2160 meshlink_errno = MESHLINK_EINVAL;
2164 char *address = meshlink_get_external_address(mesh);
2170 bool rval = meshlink_add_address(mesh, address);
2176 int meshlink_get_port(meshlink_handle_t *mesh) {
2178 meshlink_errno = MESHLINK_EINVAL;
2183 meshlink_errno = MESHLINK_EINTERNAL;
2189 pthread_mutex_lock(&mesh->mutex);
2190 port = atoi(mesh->myport);
2191 pthread_mutex_unlock(&mesh->mutex);
2196 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2197 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2198 meshlink_errno = MESHLINK_EINVAL;
2202 if(mesh->myport && port == atoi(mesh->myport)) {
2206 if(!try_bind(port)) {
2207 meshlink_errno = MESHLINK_ENETWORK;
2211 devtool_trybind_probe();
2215 pthread_mutex_lock(&mesh->mutex);
2217 if(mesh->threadstarted) {
2218 meshlink_errno = MESHLINK_EINVAL;
2223 xasprintf(&mesh->myport, "%d", port);
2225 /* Close down the network. This also deletes mesh->self. */
2226 close_network_connections(mesh);
2228 /* Recreate mesh->self. */
2229 mesh->self = new_node();
2230 mesh->self->name = xstrdup(mesh->name);
2231 mesh->self->devclass = mesh->devclass;
2232 mesh->self->session_id = mesh->session_id;
2233 xasprintf(&mesh->myport, "%d", port);
2235 if(!node_read_public_key(mesh, mesh->self)) {
2236 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2237 meshlink_errno = MESHLINK_ESTORAGE;
2238 free_node(mesh->self);
2241 } else if(!setup_network(mesh)) {
2242 meshlink_errno = MESHLINK_ENETWORK;
2246 /* Rebuild our own list of recent addresses */
2247 memset(mesh->self->recent, 0, sizeof(mesh->self->recent));
2248 add_local_addresses(mesh);
2250 /* Write meshlink.conf with the updated port number */
2251 write_main_config_files(mesh);
2253 rval = config_sync(mesh, "current");
2256 pthread_mutex_unlock(&mesh->mutex);
2258 return rval && meshlink_get_port(mesh) == port;
2261 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2262 mesh->invitation_timeout = timeout;
2265 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2266 meshlink_submesh_t *s = NULL;
2269 meshlink_errno = MESHLINK_EINVAL;
2274 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2277 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2278 meshlink_errno = MESHLINK_EINVAL;
2282 s = (meshlink_submesh_t *)mesh->self->submesh;
2285 pthread_mutex_lock(&mesh->mutex);
2287 // Check validity of the new node's name
2288 if(!check_id(name)) {
2289 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2290 meshlink_errno = MESHLINK_EINVAL;
2291 pthread_mutex_unlock(&mesh->mutex);
2295 // Ensure no host configuration file with that name exists
2296 if(config_exists(mesh, "current", name)) {
2297 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2298 meshlink_errno = MESHLINK_EEXIST;
2299 pthread_mutex_unlock(&mesh->mutex);
2303 // Ensure no other nodes know about this name
2304 if(meshlink_get_node(mesh, name)) {
2305 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2306 meshlink_errno = MESHLINK_EEXIST;
2307 pthread_mutex_unlock(&mesh->mutex);
2311 // Get the local address
2312 char *address = get_my_hostname(mesh, flags);
2315 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2316 meshlink_errno = MESHLINK_ERESOLV;
2317 pthread_mutex_unlock(&mesh->mutex);
2321 if(!refresh_invitation_key(mesh)) {
2322 meshlink_errno = MESHLINK_EINTERNAL;
2323 pthread_mutex_unlock(&mesh->mutex);
2329 // Create a hash of the key.
2330 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2331 sha512(fingerprint, strlen(fingerprint), hash);
2332 b64encode_urlsafe(hash, hash, 18);
2334 // Create a random cookie for this invitation.
2336 randomize(cookie, 18);
2338 // Create a filename that doesn't reveal the cookie itself
2339 char buf[18 + strlen(fingerprint)];
2340 char cookiehash[64];
2341 memcpy(buf, cookie, 18);
2342 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2343 sha512(buf, sizeof(buf), cookiehash);
2344 b64encode_urlsafe(cookiehash, cookiehash, 18);
2346 b64encode_urlsafe(cookie, cookie, 18);
2350 /* Construct the invitation file */
2351 uint8_t outbuf[4096];
2352 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2354 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2355 packmsg_add_str(&inv, name);
2356 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2357 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2359 /* TODO: Add several host config files to bootstrap connections.
2360 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2361 * and are not blacklisted.
2363 config_t configs[5];
2364 memset(configs, 0, sizeof(configs));
2367 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2371 /* Append host config files to the invitation file */
2372 packmsg_add_array(&inv, count);
2374 for(int i = 0; i < count; i++) {
2375 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2376 config_free(&configs[i]);
2379 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2381 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2382 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2383 meshlink_errno = MESHLINK_ESTORAGE;
2384 pthread_mutex_unlock(&mesh->mutex);
2388 // Create an URL from the local address, key hash and cookie
2390 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2393 pthread_mutex_unlock(&mesh->mutex);
2397 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2398 return meshlink_invite_ex(mesh, submesh, name, 0);
2401 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2402 if(!mesh || !invitation) {
2403 meshlink_errno = MESHLINK_EINVAL;
2407 pthread_mutex_lock(&mesh->mutex);
2409 //Before doing meshlink_join make sure we are not connected to another mesh
2410 if(mesh->threadstarted) {
2411 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2412 meshlink_errno = MESHLINK_EINVAL;
2413 pthread_mutex_unlock(&mesh->mutex);
2417 // 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.
2418 if(mesh->nodes->count > 1) {
2419 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2420 meshlink_errno = MESHLINK_EINVAL;
2421 pthread_mutex_unlock(&mesh->mutex);
2425 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2426 char copy[strlen(invitation) + 1];
2427 strcpy(copy, invitation);
2429 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2431 char *slash = strchr(copy, '/');
2439 if(strlen(slash) != 48) {
2443 char *address = copy;
2446 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2450 // Generate a throw-away key for the invitation.
2451 ecdsa_t *key = ecdsa_generate();
2454 meshlink_errno = MESHLINK_EINTERNAL;
2455 pthread_mutex_unlock(&mesh->mutex);
2459 char *b64key = ecdsa_get_base64_public_key(key);
2463 while(address && *address) {
2464 // We allow commas in the address part to support multiple addresses in one invitation URL.
2465 comma = strchr(address, ',');
2471 // Split of the port
2472 port = strrchr(address, ':');
2480 // IPv6 address are enclosed in brackets, per RFC 3986
2481 if(*address == '[') {
2483 char *bracket = strchr(address, ']');
2496 // Connect to the meshlink daemon mentioned in the URL.
2497 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2500 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2501 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2503 if(mesh->sock == -1) {
2504 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2505 meshlink_errno = MESHLINK_ENETWORK;
2509 set_timeout(mesh->sock, 5000);
2511 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2512 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2513 meshlink_errno = MESHLINK_ENETWORK;
2514 closesocket(mesh->sock);
2522 meshlink_errno = MESHLINK_ERESOLV;
2525 if(mesh->sock != -1 || !comma) {
2532 if(mesh->sock == -1) {
2533 pthread_mutex_unlock(&mesh->mutex);
2537 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2539 // Tell him we have an invitation, and give him our throw-away key.
2543 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2544 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2545 closesocket(mesh->sock);
2546 meshlink_errno = MESHLINK_ENETWORK;
2547 pthread_mutex_unlock(&mesh->mutex);
2553 char hisname[4096] = "";
2554 int code, hismajor, hisminor = 0;
2556 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) {
2557 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2558 closesocket(mesh->sock);
2559 meshlink_errno = MESHLINK_ENETWORK;
2560 pthread_mutex_unlock(&mesh->mutex);
2564 // Check if the hash of the key he gave us matches the hash in the URL.
2565 char *fingerprint = mesh->line + 2;
2568 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2569 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2570 meshlink_errno = MESHLINK_EINTERNAL;
2571 pthread_mutex_unlock(&mesh->mutex);
2575 if(memcmp(hishash, mesh->hash, 18)) {
2576 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2577 meshlink_errno = MESHLINK_EPEER;
2578 pthread_mutex_unlock(&mesh->mutex);
2583 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2586 meshlink_errno = MESHLINK_EINTERNAL;
2587 pthread_mutex_unlock(&mesh->mutex);
2591 // Start an SPTPS session
2592 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2593 meshlink_errno = MESHLINK_EINTERNAL;
2594 pthread_mutex_unlock(&mesh->mutex);
2598 // Feed rest of input buffer to SPTPS
2599 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2600 meshlink_errno = MESHLINK_EPEER;
2601 pthread_mutex_unlock(&mesh->mutex);
2607 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2609 if(errno == EINTR) {
2613 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2614 meshlink_errno = MESHLINK_ENETWORK;
2615 pthread_mutex_unlock(&mesh->mutex);
2619 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2620 meshlink_errno = MESHLINK_EPEER;
2621 pthread_mutex_unlock(&mesh->mutex);
2626 sptps_stop(&mesh->sptps);
2629 closesocket(mesh->sock);
2631 if(!mesh->success) {
2632 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2633 meshlink_errno = MESHLINK_EPEER;
2634 pthread_mutex_unlock(&mesh->mutex);
2638 pthread_mutex_unlock(&mesh->mutex);
2642 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2643 meshlink_errno = MESHLINK_EINVAL;
2644 pthread_mutex_unlock(&mesh->mutex);
2648 char *meshlink_export(meshlink_handle_t *mesh) {
2650 meshlink_errno = MESHLINK_EINVAL;
2654 // Create a config file on the fly.
2657 packmsg_output_t out = {buf, sizeof(buf)};
2658 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2659 packmsg_add_str(&out, mesh->name);
2660 packmsg_add_str(&out, CORE_MESH);
2662 pthread_mutex_lock(&mesh->mutex);
2664 packmsg_add_int32(&out, mesh->self->devclass);
2665 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2666 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2667 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2671 for(uint32_t i = 0; i < 5; i++) {
2672 if(mesh->self->recent[i].sa.sa_family) {
2679 packmsg_add_array(&out, count);
2681 for(uint32_t i = 0; i < count; i++) {
2682 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2685 pthread_mutex_unlock(&mesh->mutex);
2687 if(!packmsg_output_ok(&out)) {
2688 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2689 meshlink_errno = MESHLINK_EINTERNAL;
2693 // Prepare a base64-encoded packmsg array containing our config file
2695 uint32_t len = packmsg_output_size(&out, buf);
2696 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2697 uint8_t *buf2 = xmalloc(len2);
2698 packmsg_output_t out2 = {buf2, len2};
2699 packmsg_add_array(&out2, 1);
2700 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2702 if(!packmsg_output_ok(&out2)) {
2703 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2704 meshlink_errno = MESHLINK_EINTERNAL;
2709 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2711 return (char *)buf2;
2714 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2715 if(!mesh || !data) {
2716 meshlink_errno = MESHLINK_EINVAL;
2720 size_t datalen = strlen(data);
2721 uint8_t *buf = xmalloc(datalen);
2722 int buflen = b64decode(data, buf, datalen);
2725 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2726 meshlink_errno = MESHLINK_EPEER;
2730 packmsg_input_t in = {buf, buflen};
2731 uint32_t count = packmsg_get_array(&in);
2734 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2735 meshlink_errno = MESHLINK_EPEER;
2739 pthread_mutex_lock(&mesh->mutex);
2743 uint32_t len = packmsg_get_bin_raw(&in, &data);
2749 packmsg_input_t in2 = {data, len};
2750 uint32_t version = packmsg_get_uint32(&in2);
2751 char *name = packmsg_get_str_dup(&in2);
2753 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2755 packmsg_input_invalidate(&in);
2759 if(!check_id(name)) {
2764 node_t *n = lookup_node(mesh, name);
2767 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2775 config_t config = {data, len};
2777 if(!node_read_from_config(mesh, n, &config)) {
2779 packmsg_input_invalidate(&in);
2783 config_write(mesh, "current", n->name, &config, mesh->config_key);
2787 pthread_mutex_unlock(&mesh->mutex);
2791 if(!packmsg_done(&in)) {
2792 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2793 meshlink_errno = MESHLINK_EPEER;
2797 if(!config_sync(mesh, "current")) {
2804 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2805 if(!mesh || !node) {
2806 meshlink_errno = MESHLINK_EINVAL;
2810 pthread_mutex_lock(&mesh->mutex);
2815 if(n == mesh->self) {
2816 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2817 meshlink_errno = MESHLINK_EINVAL;
2818 pthread_mutex_unlock(&mesh->mutex);
2822 if(n->status.blacklisted) {
2823 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2824 pthread_mutex_unlock(&mesh->mutex);
2828 n->status.blacklisted = true;
2829 node_write_config(mesh, n);
2830 config_sync(mesh, "current");
2832 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2834 //Immediately terminate any connections we have with the blacklisted node
2835 for list_each(connection_t, c, mesh->connections) {
2837 terminate_connection(mesh, c, c->status.active);
2841 utcp_abort_all_connections(n->utcp);
2847 n->status.udp_confirmed = false;
2849 if(n->status.reachable) {
2850 update_node_status(mesh, n);
2853 pthread_mutex_unlock(&mesh->mutex);
2856 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2857 if(!mesh || !node) {
2858 meshlink_errno = MESHLINK_EINVAL;
2862 pthread_mutex_lock(&mesh->mutex);
2864 node_t *n = (node_t *)node;
2866 if(n == mesh->self) {
2867 logger(mesh, MESHLINK_ERROR, "%s whitelisting itself?\n", node->name);
2868 meshlink_errno = MESHLINK_EINVAL;
2869 pthread_mutex_unlock(&mesh->mutex);
2873 if(!n->status.blacklisted) {
2874 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2875 pthread_mutex_unlock(&mesh->mutex);
2879 n->status.blacklisted = false;
2880 node_write_config(mesh, n);
2881 config_sync(mesh, "current");
2883 if(n->status.reachable) {
2884 update_node_status(mesh, n);
2887 logger(mesh, MESHLINK_DEBUG, "Whitelisted %s.\n", node->name);
2889 pthread_mutex_unlock(&mesh->mutex);
2893 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2894 mesh->default_blacklist = blacklist;
2897 /* Hint that a hostname may be found at an address
2898 * See header file for detailed comment.
2900 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2901 if(!mesh || !node || !addr) {
2902 meshlink_errno = EINVAL;
2906 pthread_mutex_lock(&mesh->mutex);
2908 node_t *n = (node_t *)node;
2909 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2910 memcpy(n->recent, addr, SALEN(*addr));
2911 node_write_config(mesh, n);
2913 pthread_mutex_unlock(&mesh->mutex);
2914 // @TODO do we want to fire off a connection attempt right away?
2917 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2919 node_t *n = utcp->priv;
2920 meshlink_handle_t *mesh = n->mesh;
2921 return mesh->channel_accept_cb;
2924 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
2926 if(aio->cb.buffer) {
2927 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
2931 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
2936 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2937 meshlink_channel_t *channel = connection->priv;
2943 node_t *n = channel->node;
2944 meshlink_handle_t *mesh = n->mesh;
2946 if(n->status.destroyed) {
2947 meshlink_channel_close(mesh, channel);
2951 const char *p = data;
2954 while(channel->aio_receive) {
2955 meshlink_aio_buffer_t *aio = channel->aio_receive;
2956 size_t todo = aio->len - aio->done;
2963 memcpy((char *)aio->data + aio->done, p, todo);
2965 ssize_t result = write(aio->fd, p, todo);
2974 if(aio->done == aio->len) {
2975 channel->aio_receive = aio->next;
2976 aio_signal(mesh, channel, aio);
2988 if(channel->receive_cb) {
2989 channel->receive_cb(mesh, channel, p, left);
2995 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2996 node_t *n = utcp_connection->utcp->priv;
3002 meshlink_handle_t *mesh = n->mesh;
3004 if(!mesh->channel_accept_cb) {
3008 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3010 channel->c = utcp_connection;
3012 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
3013 utcp_accept(utcp_connection, channel_recv, channel);
3019 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
3020 node_t *n = utcp->priv;
3022 if(n->status.destroyed) {
3026 meshlink_handle_t *mesh = n->mesh;
3027 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
3030 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
3031 if(!mesh || !channel) {
3032 meshlink_errno = MESHLINK_EINVAL;
3036 channel->receive_cb = cb;
3039 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
3041 node_t *n = (node_t *)source;
3047 utcp_recv(n->utcp, data, len);
3050 static void channel_poll(struct utcp_connection *connection, size_t len) {
3051 meshlink_channel_t *channel = connection->priv;
3057 node_t *n = channel->node;
3058 meshlink_handle_t *mesh = n->mesh;
3059 meshlink_aio_buffer_t *aio = channel->aio_send;
3062 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
3063 size_t left = aio->len - aio->done;
3071 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
3074 size_t todo = utcp_get_sndbuf_free(connection);
3080 if(todo > sizeof(buf)) {
3084 ssize_t result = read(aio->fd, buf, todo);
3087 sent = utcp_send(connection, buf, result);
3097 /* If the buffer is now completely sent, call the callback and dispose of it. */
3098 if(aio->done >= aio->len) {
3099 channel->aio_send = aio->next;
3100 aio_signal(mesh, channel, aio);
3104 if(channel->poll_cb) {
3105 channel->poll_cb(mesh, channel, len);
3107 utcp_set_poll_cb(connection, NULL);
3112 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3113 if(!mesh || !channel) {
3114 meshlink_errno = MESHLINK_EINVAL;
3118 pthread_mutex_lock(&mesh->mutex);
3119 channel->poll_cb = cb;
3120 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3121 pthread_mutex_unlock(&mesh->mutex);
3124 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3126 meshlink_errno = MESHLINK_EINVAL;
3130 pthread_mutex_lock(&mesh->mutex);
3131 mesh->channel_accept_cb = cb;
3132 mesh->receive_cb = channel_receive;
3134 for splay_each(node_t, n, mesh->nodes) {
3135 if(!n->utcp && n != mesh->self) {
3136 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3140 pthread_mutex_unlock(&mesh->mutex);
3143 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3147 meshlink_errno = MESHLINK_EINVAL;
3151 pthread_mutex_lock(&mesh->mutex);
3152 utcp_set_sndbuf(channel->c, size);
3153 pthread_mutex_unlock(&mesh->mutex);
3156 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3160 meshlink_errno = MESHLINK_EINVAL;
3164 pthread_mutex_lock(&mesh->mutex);
3165 utcp_set_rcvbuf(channel->c, size);
3166 pthread_mutex_unlock(&mesh->mutex);
3169 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) {
3171 abort(); // TODO: handle non-NULL data
3174 if(!mesh || !node) {
3175 meshlink_errno = MESHLINK_EINVAL;
3179 pthread_mutex_lock(&mesh->mutex);
3181 node_t *n = (node_t *)node;
3184 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3185 mesh->receive_cb = channel_receive;
3188 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3189 pthread_mutex_unlock(&mesh->mutex);
3194 if(n->status.blacklisted) {
3195 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3196 meshlink_errno = MESHLINK_EBLACKLISTED;
3197 pthread_mutex_unlock(&mesh->mutex);
3201 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3203 channel->receive_cb = cb;
3206 channel->priv = (void *)data;
3209 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3211 pthread_mutex_unlock(&mesh->mutex);
3214 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3222 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) {
3223 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3226 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3227 if(!mesh || !channel) {
3228 meshlink_errno = MESHLINK_EINVAL;
3232 pthread_mutex_lock(&mesh->mutex);
3233 utcp_shutdown(channel->c, direction);
3234 pthread_mutex_unlock(&mesh->mutex);
3237 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3238 if(!mesh || !channel) {
3239 meshlink_errno = MESHLINK_EINVAL;
3243 pthread_mutex_lock(&mesh->mutex);
3245 utcp_close(channel->c);
3247 /* Clean up any outstanding AIO buffers. */
3248 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3250 aio_signal(mesh, channel, aio);
3254 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3256 aio_signal(mesh, channel, aio);
3260 pthread_mutex_unlock(&mesh->mutex);
3265 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3266 if(!mesh || !channel) {
3267 meshlink_errno = MESHLINK_EINVAL;
3276 meshlink_errno = MESHLINK_EINVAL;
3280 // TODO: more finegrained locking.
3281 // Ideally we want to put the data into the UTCP connection's send buffer.
3282 // Then, preferably only if there is room in the receiver window,
3283 // kick the meshlink thread to go send packets.
3287 pthread_mutex_lock(&mesh->mutex);
3289 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3290 if(channel->aio_send) {
3293 retval = utcp_send(channel->c, data, len);
3296 pthread_mutex_unlock(&mesh->mutex);
3299 meshlink_errno = MESHLINK_ENETWORK;
3305 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) {
3306 if(!mesh || !channel) {
3307 meshlink_errno = MESHLINK_EINVAL;
3312 meshlink_errno = MESHLINK_EINVAL;
3316 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3319 aio->cb.buffer = cb;
3322 pthread_mutex_lock(&mesh->mutex);
3324 /* Append the AIO buffer descriptor to the end of the chain */
3325 meshlink_aio_buffer_t **p = &channel->aio_send;
3333 /* Ensure the poll callback is set, and call it right now to push data if possible */
3334 utcp_set_poll_cb(channel->c, channel_poll);
3335 channel_poll(channel->c, len);
3337 pthread_mutex_unlock(&mesh->mutex);
3342 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) {
3343 if(!mesh || !channel) {
3344 meshlink_errno = MESHLINK_EINVAL;
3348 if(!len || fd == -1) {
3349 meshlink_errno = MESHLINK_EINVAL;
3353 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3359 pthread_mutex_lock(&mesh->mutex);
3361 /* Append the AIO buffer descriptor to the end of the chain */
3362 meshlink_aio_buffer_t **p = &channel->aio_send;
3370 /* Ensure the poll callback is set, and call it right now to push data if possible */
3371 utcp_set_poll_cb(channel->c, channel_poll);
3372 channel_poll(channel->c, len);
3374 pthread_mutex_unlock(&mesh->mutex);
3379 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) {
3380 if(!mesh || !channel) {
3381 meshlink_errno = MESHLINK_EINVAL;
3386 meshlink_errno = MESHLINK_EINVAL;
3390 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3393 aio->cb.buffer = cb;
3396 pthread_mutex_lock(&mesh->mutex);
3398 /* Append the AIO buffer descriptor to the end of the chain */
3399 meshlink_aio_buffer_t **p = &channel->aio_receive;
3407 pthread_mutex_unlock(&mesh->mutex);
3412 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) {
3413 if(!mesh || !channel) {
3414 meshlink_errno = MESHLINK_EINVAL;
3418 if(!len || fd == -1) {
3419 meshlink_errno = MESHLINK_EINVAL;
3423 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3429 pthread_mutex_lock(&mesh->mutex);
3431 /* Append the AIO buffer descriptor to the end of the chain */
3432 meshlink_aio_buffer_t **p = &channel->aio_receive;
3440 pthread_mutex_unlock(&mesh->mutex);
3445 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3446 if(!mesh || !channel) {
3447 meshlink_errno = MESHLINK_EINVAL;
3451 return channel->c->flags;
3454 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3455 if(!mesh || !channel) {
3456 meshlink_errno = MESHLINK_EINVAL;
3460 return utcp_get_sendq(channel->c);
3463 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3464 if(!mesh || !channel) {
3465 meshlink_errno = MESHLINK_EINVAL;
3469 return utcp_get_recvq(channel->c);
3472 void meshlink_set_node_channel_timeout(meshlink_handle_t *mesh, meshlink_node_t *node, int timeout) {
3473 if(!mesh || !node) {
3474 meshlink_errno = MESHLINK_EINVAL;
3478 node_t *n = (node_t *)node;
3480 pthread_mutex_lock(&mesh->mutex);
3483 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3486 utcp_set_user_timeout(n->utcp, timeout);
3488 pthread_mutex_unlock(&mesh->mutex);
3491 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3492 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3493 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3496 if(mesh->node_status_cb) {
3497 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3500 if(mesh->node_pmtu_cb) {
3501 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3505 void update_node_pmtu(meshlink_handle_t *mesh, node_t *n) {
3506 if(mesh->node_pmtu_cb && !n->status.blacklisted) {
3507 mesh->node_pmtu_cb(mesh, (meshlink_node_t *)n, n->minmtu);
3511 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3512 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3516 n->status.duplicate = true;
3517 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3520 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3524 meshlink_errno = MESHLINK_EINVAL;
3528 pthread_mutex_lock(&mesh->mutex);
3530 if(mesh->discovery == enable) {
3534 if(mesh->threadstarted) {
3536 discovery_start(mesh);
3538 discovery_stop(mesh);
3542 mesh->discovery = enable;
3545 pthread_mutex_unlock(&mesh->mutex);
3549 meshlink_errno = MESHLINK_ENOTSUP;
3553 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3554 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3555 meshlink_errno = EINVAL;
3559 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3560 meshlink_errno = EINVAL;
3564 pthread_mutex_lock(&mesh->mutex);
3565 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3566 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3567 pthread_mutex_unlock(&mesh->mutex);
3570 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3573 if(!mesh->connections || !mesh->loop.running) {
3580 void call_error_cb(meshlink_handle_t *mesh, meshlink_errno_t meshlink_errno) {
3581 // We should only call the callback function if we are in the background thread.
3582 if(!mesh->error_cb) {
3586 if(!mesh->threadstarted) {
3590 if(mesh->thread == pthread_self()) {
3591 mesh->error_cb(mesh, meshlink_errno);
3596 static void __attribute__((constructor)) meshlink_init(void) {
3600 static void __attribute__((destructor)) meshlink_exit(void) {