2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "meshlink_internal.h"
37 #include "ed25519/sha512.h"
38 #include "discovery.h"
42 #define MSG_NOSIGNAL 0
44 __thread meshlink_errno_t meshlink_errno;
45 meshlink_log_cb_t global_log_cb;
46 meshlink_log_level_t global_log_level;
48 typedef bool (*search_node_by_condition_t)(const node_t *, const void *);
50 static int rstrip(char *value) {
51 int len = strlen(value);
53 while(len && strchr("\t\r\n ", value[len - 1])) {
60 static void get_canonical_address(node_t *n, char **hostname, char **port) {
61 if(!n->canonical_address) {
65 *hostname = xstrdup(n->canonical_address);
66 char *space = strchr(*hostname, ' ');
70 *port = xstrdup(space);
74 static bool is_valid_hostname(const char *hostname) {
79 for(const char *p = hostname; *p; p++) {
80 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
88 static bool is_valid_port(const char *port) {
95 unsigned long int result = strtoul(port, &end, 10);
96 return result && result < 65536 && !*end;
99 for(const char *p = port; *p; p++) {
100 if(!(isalnum(*p) || *p == '-')) {
108 static void set_timeout(int sock, int timeout) {
113 tv.tv_sec = timeout / 1000;
114 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
116 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
117 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
120 struct socket_in_netns_params {
129 static void *socket_in_netns_thread(void *arg) {
130 struct socket_in_netns_params *params = arg;
132 if(setns(params->netns, CLONE_NEWNET) == -1) {
133 meshlink_errno = MESHLINK_EINVAL;
137 params->fd = socket(params->domain, params->type, params->protocol);
143 static int socket_in_netns(int domain, int type, int protocol, int netns) {
145 return socket(domain, type, protocol);
149 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
153 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
154 pthread_join(thr, NULL);
164 // Find out what local address a socket would use if we connect to the given address.
165 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
166 // of both endpoints, but this will actually not send any UDP packet.
167 static bool getlocaladdr(char *destaddr, struct sockaddr *sn, socklen_t *sl, int netns) {
168 struct addrinfo *rai = NULL;
169 const struct addrinfo hint = {
170 .ai_family = AF_UNSPEC,
171 .ai_socktype = SOCK_DGRAM,
172 .ai_protocol = IPPROTO_UDP,
175 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
179 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
186 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
194 if(getsockname(sock, sn, sl)) {
203 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
204 struct sockaddr_storage sn;
205 socklen_t sl = sizeof(sn);
207 if(!getlocaladdr(destaddr, (struct sockaddr *)&sn, &sl, netns)) {
211 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
218 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
219 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
222 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
223 char *hostname = NULL;
225 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
226 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
227 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
230 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
231 if(family != AF_UNSPEC && aip->ai_family != family) {
235 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
238 set_timeout(s, 5000);
240 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
247 send(s, request, sizeof(request) - 1, 0);
248 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
253 if(line[len - 1] == '\n') {
257 char *p = strrchr(line, '\n');
260 hostname = xstrdup(p + 1);
276 // Check that the hostname is reasonable
277 if(hostname && !is_valid_hostname(hostname)) {
283 meshlink_errno = MESHLINK_ERESOLV;
289 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
292 // Determine address of the local interface used for outgoing connections.
293 char localaddr[NI_MAXHOST];
294 bool success = false;
296 if(family == AF_INET) {
297 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
298 } else if(family == AF_INET6) {
299 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
303 meshlink_errno = MESHLINK_ENETWORK;
307 return xstrdup(localaddr);
310 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
311 for(int i = 0; i < n; i++) {
316 // Ignore duplicate hostnames
319 for(int j = 0; j < i; j++) {
324 if(strcmp(host[i], host[j])) {
328 if(strcmp(port[i], port[j])) {
346 // This gets the hostname part for use in invitation URLs
347 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
348 char *hostname[4] = {NULL};
349 char *port[4] = {NULL};
350 char *hostport = NULL;
352 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
353 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
356 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
357 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
360 // Add local addresses if requested
361 if(flags & MESHLINK_INVITE_LOCAL) {
362 if(flags & MESHLINK_INVITE_IPV4) {
363 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
366 if(flags & MESHLINK_INVITE_IPV6) {
367 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
371 // Add public/canonical addresses if requested
372 if(flags & MESHLINK_INVITE_PUBLIC) {
373 // Try the CanonicalAddress first
374 get_canonical_address(mesh->self, &hostname[2], &port[2]);
377 if(flags & MESHLINK_INVITE_IPV4) {
378 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
381 if(flags & MESHLINK_INVITE_IPV6) {
382 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
387 for(int i = 0; i < 4; i++) {
388 // Ensure we always have a port number
389 if(hostname[i] && !port[i]) {
390 port[i] = xstrdup(mesh->myport);
394 remove_duplicate_hostnames(hostname, port, 4);
396 if(!(flags & MESHLINK_INVITE_NUMERIC)) {
397 for(int i = 0; i < 4; i++) {
402 // Convert what we have to a sockaddr
403 struct addrinfo *ai_in, *ai_out;
404 struct addrinfo hint = {
405 .ai_family = AF_UNSPEC,
406 .ai_flags = AI_NUMERICSERV,
407 .ai_socktype = SOCK_STREAM,
409 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
415 // Convert it to a hostname
416 char resolved_host[NI_MAXHOST];
417 char resolved_port[NI_MAXSERV];
418 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
425 // Convert the hostname back to a sockaddr
426 hint.ai_family = ai_in->ai_family;
427 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
434 // Check if it's still the same sockaddr
435 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
437 freeaddrinfo(ai_out);
441 // Yes: replace the hostname with the resolved one
443 hostname[i] = xstrdup(resolved_host);
446 freeaddrinfo(ai_out);
450 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
451 remove_duplicate_hostnames(hostname, port, 4);
453 // Concatenate all unique address to the hostport string
454 for(int i = 0; i < 4; i++) {
459 // Ensure we have the same addresses in our own host config file.
461 xasprintf(&tmphostport, "%s %s", hostname[i], port[i]);
463 //config_add_string(&mesh->config, "Address", tmphostport);
466 // Append the address to the hostport string
468 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
470 hostport = newhostport;
479 static bool try_bind(int port) {
480 struct addrinfo *ai = NULL;
481 struct addrinfo hint = {
482 .ai_flags = AI_PASSIVE,
483 .ai_family = AF_UNSPEC,
484 .ai_socktype = SOCK_STREAM,
485 .ai_protocol = IPPROTO_TCP,
489 snprintf(portstr, sizeof(portstr), "%d", port);
491 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
496 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
497 int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
504 int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
517 int check_port(meshlink_handle_t *mesh) {
518 for(int i = 0; i < 1000; i++) {
519 int port = 0x1000 + (rand() & 0x7fff);
523 xasprintf(&mesh->myport, "%d", port);
528 meshlink_errno = MESHLINK_ENETWORK;
529 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
533 static bool write_main_config_files(meshlink_handle_t *mesh) {
534 if(!mesh->confbase) {
540 /* Write the main config file */
541 packmsg_output_t out = {buf, sizeof buf};
543 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
544 packmsg_add_str(&out, mesh->name);
545 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
546 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
547 packmsg_add_uint16(&out, atoi(mesh->myport));
549 if(!packmsg_output_ok(&out)) {
553 config_t config = {buf, packmsg_output_size(&out, buf)};
555 if(!main_config_write(mesh, "current", &config, mesh->config_key)) {
559 /* Write our own host config file */
560 if(!node_write_config(mesh, mesh->self)) {
567 static bool finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
568 packmsg_input_t in = {buf, len};
569 uint32_t version = packmsg_get_uint32(&in);
571 if(version != MESHLINK_INVITATION_VERSION) {
572 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
576 char *name = packmsg_get_str_dup(&in);
577 packmsg_skip_element(&in); /* submesh */
578 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 socklen_t sl = sizeof(sn);
853 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
854 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
855 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
862 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
863 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
864 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
868 static bool meshlink_setup(meshlink_handle_t *mesh) {
869 if(!config_init(mesh, "current")) {
870 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/current: %s\n", mesh->confbase, strerror(errno));
871 meshlink_errno = MESHLINK_ESTORAGE;
875 if(!ecdsa_keygen(mesh)) {
876 meshlink_errno = MESHLINK_EINTERNAL;
880 if(check_port(mesh) == 0) {
881 meshlink_errno = MESHLINK_ENETWORK;
885 /* Create a node for ourself */
887 mesh->self = new_node();
888 mesh->self->name = xstrdup(mesh->name);
889 mesh->self->devclass = mesh->devclass;
890 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
892 if(!write_main_config_files(mesh)) {
893 logger(mesh, MESHLINK_ERROR, "Could not write main config files into %s/current: %s\n", mesh->confbase, strerror(errno));
894 meshlink_errno = MESHLINK_ESTORAGE;
898 /* Ensure the configuration directory metadata is on disk */
899 if(!config_sync(mesh, "current")) {
903 if(!main_config_lock(mesh)) {
904 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
905 meshlink_errno = MESHLINK_ESTORAGE;
912 static bool meshlink_read_config(meshlink_handle_t *mesh) {
913 // Open the configuration file and lock it
914 if(!main_config_lock(mesh)) {
915 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
916 meshlink_errno = MESHLINK_ESTORAGE;
922 if(!main_config_read(mesh, "current", &config, mesh->config_key)) {
923 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
927 packmsg_input_t in = {config.buf, config.len};
928 const void *private_key;
929 const void *invitation_key;
931 uint32_t version = packmsg_get_uint32(&in);
932 char *name = packmsg_get_str_dup(&in);
933 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
934 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
935 uint16_t myport = packmsg_get_uint16(&in);
937 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
938 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
940 config_free(&config);
947 if(mesh->name && strcmp(mesh->name, name)) {
948 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
949 meshlink_errno = MESHLINK_ESTORAGE;
951 config_free(&config);
959 xasprintf(&mesh->myport, "%u", myport);
960 mesh->private_key = ecdsa_set_private_key(private_key);
961 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
962 config_free(&config);
964 /* Create a node for ourself and read our host configuration file */
966 mesh->self = new_node();
967 mesh->self->name = xstrdup(name);
968 mesh->self->devclass = mesh->devclass;
970 if(!node_read_public_key(mesh, mesh->self)) {
971 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
972 meshlink_errno = MESHLINK_ESTORAGE;
973 free_node(mesh->self);
982 static void *setup_network_in_netns_thread(void *arg) {
983 meshlink_handle_t *mesh = arg;
985 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
989 bool success = setup_network(mesh);
990 add_local_addresses(mesh);
991 return success ? arg : NULL;
995 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
996 if(!confbase || !*confbase) {
997 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
998 meshlink_errno = MESHLINK_EINVAL;
1002 if(!appname || !*appname) {
1003 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1004 meshlink_errno = MESHLINK_EINVAL;
1008 if(strchr(appname, ' ')) {
1009 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1010 meshlink_errno = MESHLINK_EINVAL;
1014 if(!name || !*name) {
1015 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1017 } else { //check name only if there is a name != NULL
1018 if(!check_id(name)) {
1019 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1020 meshlink_errno = MESHLINK_EINVAL;
1025 if(devclass < 0 || devclass >= DEV_CLASS_COUNT) {
1026 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1027 meshlink_errno = MESHLINK_EINVAL;
1031 meshlink_open_params_t *params = xzalloc(sizeof * params);
1033 params->confbase = xstrdup(confbase);
1034 params->name = xstrdup(name);
1035 params->appname = xstrdup(appname);
1036 params->devclass = devclass;
1042 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1044 meshlink_errno = MESHLINK_EINVAL;
1048 params->netns = netns;
1053 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1055 meshlink_errno = MESHLINK_EINVAL;
1059 if((!key && keylen) || (key && !keylen)) {
1060 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1061 meshlink_errno = MESHLINK_EINVAL;
1066 params->keylen = keylen;
1071 bool meshlink_encrypted_key_rotate(meshlink_handle_t *mesh, const void *new_key, size_t new_keylen) {
1072 if(!mesh || !new_key || !new_keylen) {
1073 logger(mesh, MESHLINK_ERROR, "Invalid arguments given!\n");
1074 meshlink_errno = MESHLINK_EINVAL;
1078 pthread_mutex_lock(&(mesh->mesh_mutex));
1080 // Create hash for the new key
1081 void *new_config_key;
1082 new_config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1084 if(!prf(new_key, new_keylen, "MeshLink configuration key", 26, new_config_key, CHACHA_POLY1305_KEYLEN)) {
1085 logger(mesh, MESHLINK_ERROR, "Error creating new configuration key!\n");
1086 meshlink_errno = MESHLINK_EINTERNAL;
1087 pthread_mutex_unlock(&(mesh->mesh_mutex));
1091 // Copy contents of the "current" confbase sub-directory to "new" confbase sub-directory with the new key
1093 if(!config_copy(mesh, "current", mesh->config_key, "new", new_config_key)) {
1094 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s/old: %s\n", mesh->confbase, strerror(errno));
1095 meshlink_errno = MESHLINK_ESTORAGE;
1096 pthread_mutex_unlock(&(mesh->mesh_mutex));
1100 devtool_keyrotate_probe(1);
1102 main_config_unlock(mesh);
1104 // Rename confbase/current/ to confbase/old
1106 if(!config_rename(mesh, "current", "old")) {
1107 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/current to %s/old\n", mesh->confbase, mesh->confbase);
1108 meshlink_errno = MESHLINK_ESTORAGE;
1109 main_config_lock(mesh);
1110 pthread_mutex_unlock(&(mesh->mesh_mutex));
1114 devtool_keyrotate_probe(2);
1116 // Rename confbase/new/ to confbase/current
1118 if(!config_rename(mesh, "new", "current")) {
1119 logger(mesh, MESHLINK_ERROR, "Cannot rename %s/new to %s/current\n", mesh->confbase, mesh->confbase);
1120 meshlink_errno = MESHLINK_ESTORAGE;
1121 main_config_lock(mesh);
1122 pthread_mutex_unlock(&(mesh->mesh_mutex));
1126 devtool_keyrotate_probe(3);
1128 if(!main_config_lock(mesh)) {
1129 pthread_mutex_unlock(&(mesh->mesh_mutex));
1133 // Cleanup the "old" confbase sub-directory
1135 if(!config_destroy(mesh->confbase, "old")) {
1136 pthread_mutex_unlock(&(mesh->mesh_mutex));
1140 // Change the mesh handle key with new key
1142 free(mesh->config_key);
1143 mesh->config_key = new_config_key;
1145 pthread_mutex_unlock(&(mesh->mesh_mutex));
1150 void meshlink_open_params_free(meshlink_open_params_t *params) {
1152 meshlink_errno = MESHLINK_EINVAL;
1156 free(params->confbase);
1158 free(params->appname);
1163 /// Device class traits
1164 static const dev_class_traits_t default_class_traits[DEV_CLASS_COUNT] = {
1165 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1166 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1167 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1168 { .pingtimeout = 5, .pinginterval = 60, .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN
1171 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1172 if(!confbase || !*confbase) {
1173 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1174 meshlink_errno = MESHLINK_EINVAL;
1178 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1179 meshlink_open_params_t params;
1180 memset(¶ms, 0, sizeof(params));
1182 params.confbase = (char *)confbase;
1183 params.name = (char *)name;
1184 params.appname = (char *)appname;
1185 params.devclass = devclass;
1188 return meshlink_open_ex(¶ms);
1191 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) {
1192 if(!confbase || !*confbase) {
1193 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1194 meshlink_errno = MESHLINK_EINVAL;
1198 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1199 meshlink_open_params_t params = {NULL};
1201 params.confbase = (char *)confbase;
1202 params.name = (char *)name;
1203 params.appname = (char *)appname;
1204 params.devclass = devclass;
1207 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1211 return meshlink_open_ex(¶ms);
1214 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1215 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1216 meshlink_open_params_t params = {NULL};
1218 params.name = (char *)name;
1219 params.appname = (char *)appname;
1220 params.devclass = devclass;
1223 return meshlink_open_ex(¶ms);
1226 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1227 // Validate arguments provided by the application
1228 bool usingname = false;
1230 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1232 if(!params->appname || !*params->appname) {
1233 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1234 meshlink_errno = MESHLINK_EINVAL;
1238 if(strchr(params->appname, ' ')) {
1239 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1240 meshlink_errno = MESHLINK_EINVAL;
1244 if(!params->name || !*params->name) {
1245 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1247 } else { //check name only if there is a name != NULL
1249 if(!check_id(params->name)) {
1250 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1251 meshlink_errno = MESHLINK_EINVAL;
1258 if(params->devclass < 0 || params->devclass >= DEV_CLASS_COUNT) {
1259 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1260 meshlink_errno = MESHLINK_EINVAL;
1264 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1265 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1266 meshlink_errno = MESHLINK_EINVAL;
1270 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1272 if(params->confbase) {
1273 mesh->confbase = xstrdup(params->confbase);
1276 mesh->appname = xstrdup(params->appname);
1277 mesh->devclass = params->devclass;
1278 mesh->discovery = true;
1279 mesh->invitation_timeout = 604800; // 1 week
1280 mesh->netns = params->netns;
1281 mesh->submeshes = NULL;
1282 mesh->log_cb = global_log_cb;
1283 mesh->log_level = global_log_level;
1285 memcpy(mesh->dev_class_traits, default_class_traits, sizeof(default_class_traits));
1288 mesh->name = xstrdup(params->name);
1293 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1295 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1296 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1297 meshlink_close(mesh);
1298 meshlink_errno = MESHLINK_EINTERNAL;
1304 pthread_mutexattr_t attr;
1305 pthread_mutexattr_init(&attr);
1306 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1307 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1309 mesh->threadstarted = false;
1310 event_loop_init(&mesh->loop);
1311 mesh->loop.data = mesh;
1313 meshlink_queue_init(&mesh->outpacketqueue);
1315 // If no configuration exists yet, create it.
1317 if(!meshlink_confbase_exists(mesh)) {
1318 if(!meshlink_setup(mesh)) {
1319 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1320 meshlink_close(mesh);
1324 if(!meshlink_read_config(mesh)) {
1325 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1326 meshlink_close(mesh);
1332 struct WSAData wsa_state;
1333 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1336 // Setup up everything
1337 // TODO: we should not open listening sockets yet
1339 bool success = false;
1341 if(mesh->netns != -1) {
1345 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1346 void *retval = NULL;
1347 success = pthread_join(thr, &retval) == 0 && retval;
1351 meshlink_errno = MESHLINK_EINTERNAL;
1354 #endif // HAVE_SETNS
1356 success = setup_network(mesh);
1357 add_local_addresses(mesh);
1361 meshlink_close(mesh);
1362 meshlink_errno = MESHLINK_ENETWORK;
1366 add_local_addresses(mesh);
1367 node_write_config(mesh, mesh->self);
1369 idle_set(&mesh->loop, idle, mesh);
1371 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1375 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1376 meshlink_submesh_t *s = NULL;
1379 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1380 meshlink_errno = MESHLINK_EINVAL;
1384 if(!submesh || !*submesh) {
1385 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1386 meshlink_errno = MESHLINK_EINVAL;
1391 pthread_mutex_lock(&(mesh->mesh_mutex));
1393 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1395 pthread_mutex_unlock(&(mesh->mesh_mutex));
1400 static void *meshlink_main_loop(void *arg) {
1401 meshlink_handle_t *mesh = arg;
1403 if(mesh->netns != -1) {
1406 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1407 pthread_cond_signal(&mesh->cond);
1412 pthread_cond_signal(&mesh->cond);
1414 #endif // HAVE_SETNS
1419 if(mesh->discovery) {
1420 discovery_start(mesh);
1425 pthread_mutex_lock(&(mesh->mesh_mutex));
1427 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1428 pthread_cond_broadcast(&mesh->cond);
1430 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1432 pthread_mutex_unlock(&(mesh->mesh_mutex));
1437 if(mesh->discovery) {
1438 discovery_stop(mesh);
1446 bool meshlink_start(meshlink_handle_t *mesh) {
1448 assert(mesh->private_key);
1451 meshlink_errno = MESHLINK_EINVAL;
1455 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1457 pthread_mutex_lock(&(mesh->mesh_mutex));
1459 assert(mesh->self->ecdsa);
1460 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1462 if(mesh->threadstarted) {
1463 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1464 pthread_mutex_unlock(&(mesh->mesh_mutex));
1468 if(mesh->listen_socket[0].tcp.fd < 0) {
1469 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1470 meshlink_errno = MESHLINK_ENETWORK;
1474 mesh->thedatalen = 0;
1476 // TODO: open listening sockets first
1478 //Check that a valid name is set
1480 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1481 meshlink_errno = MESHLINK_EINVAL;
1482 pthread_mutex_unlock(&(mesh->mesh_mutex));
1486 init_outgoings(mesh);
1488 // Start the main thread
1490 event_loop_start(&mesh->loop);
1492 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1493 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1494 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1495 meshlink_errno = MESHLINK_EINTERNAL;
1496 event_loop_stop(&mesh->loop);
1497 pthread_mutex_unlock(&(mesh->mesh_mutex));
1501 pthread_cond_wait(&mesh->cond, &mesh->mesh_mutex);
1502 mesh->threadstarted = true;
1504 pthread_mutex_unlock(&(mesh->mesh_mutex));
1508 void meshlink_stop(meshlink_handle_t *mesh) {
1510 meshlink_errno = MESHLINK_EINVAL;
1514 pthread_mutex_lock(&(mesh->mesh_mutex));
1515 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1517 // Shut down the main thread
1518 event_loop_stop(&mesh->loop);
1520 // Send ourselves a UDP packet to kick the event loop
1521 for(int i = 0; i < mesh->listen_sockets; i++) {
1523 socklen_t salen = sizeof(sa.sa);
1525 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1526 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1530 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1531 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1535 if(mesh->threadstarted) {
1536 // Wait for the main thread to finish
1537 pthread_mutex_unlock(&(mesh->mesh_mutex));
1538 pthread_join(mesh->thread, NULL);
1539 pthread_mutex_lock(&(mesh->mesh_mutex));
1541 mesh->threadstarted = false;
1544 // Close all metaconnections
1545 if(mesh->connections) {
1546 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1548 connection_t *c = node->data;
1550 terminate_connection(mesh, c, false);
1554 exit_outgoings(mesh);
1556 // Write out any changed node config files
1558 for splay_each(node_t, n, mesh->nodes) {
1559 if(n->status.dirty) {
1560 node_write_config(mesh, n);
1561 n->status.dirty = false;
1566 pthread_mutex_unlock(&(mesh->mesh_mutex));
1569 void meshlink_close(meshlink_handle_t *mesh) {
1571 meshlink_errno = MESHLINK_EINVAL;
1575 // stop can be called even if mesh has not been started
1576 meshlink_stop(mesh);
1578 // lock is not released after this
1579 pthread_mutex_lock(&(mesh->mesh_mutex));
1581 // Close and free all resources used.
1583 close_network_connections(mesh);
1585 logger(mesh, MESHLINK_INFO, "Terminating");
1587 event_loop_exit(&mesh->loop);
1591 if(mesh->confbase) {
1597 ecdsa_free(mesh->invitation_key);
1599 if(mesh->netns != -1) {
1604 free(mesh->appname);
1605 free(mesh->confbase);
1606 free(mesh->config_key);
1607 ecdsa_free(mesh->private_key);
1608 pthread_mutex_destroy(&(mesh->mesh_mutex));
1610 main_config_unlock(mesh);
1612 memset(mesh, 0, sizeof(*mesh));
1617 bool meshlink_destroy(const char *confbase) {
1619 meshlink_errno = MESHLINK_EINVAL;
1623 if(!config_destroy(confbase, "current")) {
1624 logger(NULL, MESHLINK_ERROR, "Cannot remove confbase sub-directories %s: %s\n", confbase, strerror(errno));
1628 config_destroy(confbase, "new");
1629 config_destroy(confbase, "old");
1631 if(rmdir(confbase) && errno != ENOENT) {
1632 logger(NULL, MESHLINK_ERROR, "Cannot remove directory %s: %s\n", confbase, strerror(errno));
1633 meshlink_errno = MESHLINK_ESTORAGE;
1640 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1642 meshlink_errno = MESHLINK_EINVAL;
1646 pthread_mutex_lock(&(mesh->mesh_mutex));
1647 mesh->receive_cb = cb;
1648 pthread_mutex_unlock(&(mesh->mesh_mutex));
1651 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1653 meshlink_errno = MESHLINK_EINVAL;
1657 pthread_mutex_lock(&(mesh->mesh_mutex));
1658 mesh->connection_try_cb = cb;
1659 pthread_mutex_unlock(&(mesh->mesh_mutex));
1662 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1664 meshlink_errno = MESHLINK_EINVAL;
1668 pthread_mutex_lock(&(mesh->mesh_mutex));
1669 mesh->node_status_cb = cb;
1670 pthread_mutex_unlock(&(mesh->mesh_mutex));
1673 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1675 meshlink_errno = MESHLINK_EINVAL;
1679 pthread_mutex_lock(&(mesh->mesh_mutex));
1680 mesh->node_duplicate_cb = cb;
1681 pthread_mutex_unlock(&(mesh->mesh_mutex));
1684 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1686 pthread_mutex_lock(&(mesh->mesh_mutex));
1688 mesh->log_level = cb ? level : 0;
1689 pthread_mutex_unlock(&(mesh->mesh_mutex));
1692 global_log_level = cb ? level : 0;
1696 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1697 meshlink_packethdr_t *hdr;
1699 // Validate arguments
1700 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1701 meshlink_errno = MESHLINK_EINVAL;
1710 meshlink_errno = MESHLINK_EINVAL;
1714 node_t *n = (node_t *)destination;
1716 if(n->status.blacklisted) {
1717 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1721 // Prepare the packet
1722 vpn_packet_t *packet = malloc(sizeof(*packet));
1725 meshlink_errno = MESHLINK_ENOMEM;
1729 packet->probe = false;
1730 packet->tcp = false;
1731 packet->len = len + sizeof(*hdr);
1733 hdr = (meshlink_packethdr_t *)packet->data;
1734 memset(hdr, 0, sizeof(*hdr));
1735 // leave the last byte as 0 to make sure strings are always
1736 // null-terminated if they are longer than the buffer
1737 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1738 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1740 memcpy(packet->data + sizeof(*hdr), data, len);
1743 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1745 meshlink_errno = MESHLINK_ENOMEM;
1749 // Notify event loop
1750 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1755 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1757 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1763 mesh->self->in_packets++;
1764 mesh->self->in_bytes += packet->len;
1765 route(mesh, mesh->self, packet);
1768 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1769 if(!mesh || !destination) {
1770 meshlink_errno = MESHLINK_EINVAL;
1774 pthread_mutex_lock(&(mesh->mesh_mutex));
1776 node_t *n = (node_t *)destination;
1778 if(!n->status.reachable) {
1779 pthread_mutex_unlock(&(mesh->mesh_mutex));
1782 } else if(n->mtuprobes > 30 && n->minmtu) {
1783 pthread_mutex_unlock(&(mesh->mesh_mutex));
1786 pthread_mutex_unlock(&(mesh->mesh_mutex));
1791 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1792 if(!mesh || !node) {
1793 meshlink_errno = MESHLINK_EINVAL;
1797 pthread_mutex_lock(&(mesh->mesh_mutex));
1799 node_t *n = (node_t *)node;
1801 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1802 meshlink_errno = MESHLINK_EINTERNAL;
1803 pthread_mutex_unlock(&(mesh->mesh_mutex));
1807 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1810 meshlink_errno = MESHLINK_EINTERNAL;
1813 pthread_mutex_unlock(&(mesh->mesh_mutex));
1817 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1819 meshlink_errno = MESHLINK_EINVAL;
1823 return (meshlink_node_t *)mesh->self;
1826 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1827 if(!mesh || !name) {
1828 meshlink_errno = MESHLINK_EINVAL;
1832 meshlink_node_t *node = NULL;
1834 pthread_mutex_lock(&(mesh->mesh_mutex));
1835 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1836 pthread_mutex_unlock(&(mesh->mesh_mutex));
1840 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
1841 if(!mesh || !name) {
1842 meshlink_errno = MESHLINK_EINVAL;
1846 meshlink_submesh_t *submesh = NULL;
1848 pthread_mutex_lock(&(mesh->mesh_mutex));
1849 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
1850 pthread_mutex_unlock(&(mesh->mesh_mutex));
1854 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1855 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1856 meshlink_errno = MESHLINK_EINVAL;
1860 meshlink_node_t **result;
1863 pthread_mutex_lock(&(mesh->mesh_mutex));
1865 *nmemb = mesh->nodes->count;
1866 result = realloc(nodes, *nmemb * sizeof(*nodes));
1869 meshlink_node_t **p = result;
1871 for splay_each(node_t, n, mesh->nodes) {
1872 *p++ = (meshlink_node_t *)n;
1877 meshlink_errno = MESHLINK_ENOMEM;
1880 pthread_mutex_unlock(&(mesh->mesh_mutex));
1885 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) {
1886 meshlink_node_t **result;
1888 pthread_mutex_lock(&(mesh->mesh_mutex));
1892 for splay_each(node_t, n, mesh->nodes) {
1893 if(true == search_node(n, condition)) {
1894 *nmemb = *nmemb + 1;
1900 pthread_mutex_unlock(&(mesh->mesh_mutex));
1904 result = realloc(nodes, *nmemb * sizeof(*nodes));
1907 meshlink_node_t **p = result;
1909 for splay_each(node_t, n, mesh->nodes) {
1910 if(true == search_node(n, condition)) {
1911 *p++ = (meshlink_node_t *)n;
1917 meshlink_errno = MESHLINK_ENOMEM;
1920 pthread_mutex_unlock(&(mesh->mesh_mutex));
1925 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1926 dev_class_t *devclass = (dev_class_t *)condition;
1928 if(*devclass == (dev_class_t)node->devclass) {
1935 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1936 if(condition == node->submesh) {
1943 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) {
1944 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT || !nmemb) {
1945 meshlink_errno = MESHLINK_EINVAL;
1949 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
1952 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
1953 if(!mesh || !submesh || !nmemb) {
1954 meshlink_errno = MESHLINK_EINVAL;
1958 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
1961 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
1962 if(!mesh || !node) {
1963 meshlink_errno = MESHLINK_EINVAL;
1967 dev_class_t devclass;
1969 pthread_mutex_lock(&(mesh->mesh_mutex));
1971 devclass = ((node_t *)node)->devclass;
1973 pthread_mutex_unlock(&(mesh->mesh_mutex));
1978 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
1979 if(!mesh || !node) {
1980 meshlink_errno = MESHLINK_EINVAL;
1984 node_t *n = (node_t *)node;
1986 meshlink_submesh_t *s;
1988 s = (meshlink_submesh_t *)n->submesh;
1993 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1994 if(!mesh || !data || !len || !signature || !siglen) {
1995 meshlink_errno = MESHLINK_EINVAL;
1999 if(*siglen < MESHLINK_SIGLEN) {
2000 meshlink_errno = MESHLINK_EINVAL;
2004 pthread_mutex_lock(&(mesh->mesh_mutex));
2006 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
2007 meshlink_errno = MESHLINK_EINTERNAL;
2008 pthread_mutex_unlock(&(mesh->mesh_mutex));
2012 *siglen = MESHLINK_SIGLEN;
2013 pthread_mutex_unlock(&(mesh->mesh_mutex));
2017 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
2018 if(!mesh || !data || !len || !signature) {
2019 meshlink_errno = MESHLINK_EINVAL;
2023 if(siglen != MESHLINK_SIGLEN) {
2024 meshlink_errno = MESHLINK_EINVAL;
2028 pthread_mutex_lock(&(mesh->mesh_mutex));
2032 struct node_t *n = (struct node_t *)source;
2034 if(!node_read_public_key(mesh, n)) {
2035 meshlink_errno = MESHLINK_EINTERNAL;
2038 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
2041 pthread_mutex_unlock(&(mesh->mesh_mutex));
2045 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
2046 pthread_mutex_lock(&(mesh->mesh_mutex));
2048 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
2051 // TODO: Update invitation key if necessary?
2054 pthread_mutex_unlock(&(mesh->mesh_mutex));
2056 return mesh->invitation_key;
2059 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
2060 if(!mesh || !node || !address) {
2061 meshlink_errno = MESHLINK_EINVAL;
2065 if(!is_valid_hostname(address)) {
2066 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
2067 meshlink_errno = MESHLINK_EINVAL;
2071 if(port && !is_valid_port(port)) {
2072 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
2073 meshlink_errno = MESHLINK_EINVAL;
2077 char *canonical_address;
2080 xasprintf(&canonical_address, "%s %s", address, port);
2082 canonical_address = xstrdup(address);
2085 pthread_mutex_lock(&(mesh->mesh_mutex));
2087 node_t *n = (node_t *)node;
2088 free(n->canonical_address);
2089 n->canonical_address = canonical_address;
2090 node_write_config(mesh, n);
2092 pthread_mutex_unlock(&(mesh->mesh_mutex));
2097 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
2098 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
2101 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
2103 meshlink_errno = MESHLINK_EINVAL;
2107 char *address = meshlink_get_external_address(mesh);
2113 bool rval = meshlink_add_address(mesh, address);
2119 int meshlink_get_port(meshlink_handle_t *mesh) {
2121 meshlink_errno = MESHLINK_EINVAL;
2126 meshlink_errno = MESHLINK_EINTERNAL;
2130 return atoi(mesh->myport);
2133 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2134 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2135 meshlink_errno = MESHLINK_EINVAL;
2139 if(mesh->myport && port == atoi(mesh->myport)) {
2143 if(!try_bind(port)) {
2144 meshlink_errno = MESHLINK_ENETWORK;
2148 devtool_trybind_probe();
2152 pthread_mutex_lock(&(mesh->mesh_mutex));
2154 if(mesh->threadstarted) {
2155 meshlink_errno = MESHLINK_EINVAL;
2160 xasprintf(&mesh->myport, "%d", port);
2162 /* Write meshlink.conf with the updated port number */
2163 write_main_config_files(mesh);
2165 /* Close down the network. This also deletes mesh->self. */
2166 close_network_connections(mesh);
2168 /* Recreate mesh->self. */
2169 mesh->self = new_node();
2170 mesh->self->name = xstrdup(mesh->name);
2171 mesh->self->devclass = mesh->devclass;
2172 xasprintf(&mesh->myport, "%d", port);
2174 if(!node_read_public_key(mesh, mesh->self)) {
2175 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
2176 meshlink_errno = MESHLINK_ESTORAGE;
2177 free_node(mesh->self);
2179 } else if(!setup_network(mesh)) {
2180 meshlink_errno = MESHLINK_ENETWORK;
2186 pthread_mutex_unlock(&(mesh->mesh_mutex));
2188 return rval && meshlink_get_port(mesh) == port;
2191 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2192 mesh->invitation_timeout = timeout;
2195 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2196 meshlink_submesh_t *s = NULL;
2199 meshlink_errno = MESHLINK_EINVAL;
2204 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2207 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2208 meshlink_errno = MESHLINK_EINVAL;
2212 s = (meshlink_submesh_t *)mesh->self->submesh;
2215 pthread_mutex_lock(&(mesh->mesh_mutex));
2217 // Check validity of the new node's name
2218 if(!check_id(name)) {
2219 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2220 meshlink_errno = MESHLINK_EINVAL;
2221 pthread_mutex_unlock(&(mesh->mesh_mutex));
2225 // Ensure no host configuration file with that name exists
2226 if(config_exists(mesh, "current", name)) {
2227 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2228 meshlink_errno = MESHLINK_EEXIST;
2229 pthread_mutex_unlock(&(mesh->mesh_mutex));
2233 // Ensure no other nodes know about this name
2234 if(meshlink_get_node(mesh, name)) {
2235 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2236 meshlink_errno = MESHLINK_EEXIST;
2237 pthread_mutex_unlock(&(mesh->mesh_mutex));
2241 // Get the local address
2242 char *address = get_my_hostname(mesh, flags);
2245 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2246 meshlink_errno = MESHLINK_ERESOLV;
2247 pthread_mutex_unlock(&(mesh->mesh_mutex));
2251 if(!refresh_invitation_key(mesh)) {
2252 meshlink_errno = MESHLINK_EINTERNAL;
2253 pthread_mutex_unlock(&(mesh->mesh_mutex));
2259 // Create a hash of the key.
2260 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2261 sha512(fingerprint, strlen(fingerprint), hash);
2262 b64encode_urlsafe(hash, hash, 18);
2264 // Create a random cookie for this invitation.
2266 randomize(cookie, 18);
2268 // Create a filename that doesn't reveal the cookie itself
2269 char buf[18 + strlen(fingerprint)];
2270 char cookiehash[64];
2271 memcpy(buf, cookie, 18);
2272 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2273 sha512(buf, sizeof(buf), cookiehash);
2274 b64encode_urlsafe(cookiehash, cookiehash, 18);
2276 b64encode_urlsafe(cookie, cookie, 18);
2280 /* Construct the invitation file */
2281 uint8_t outbuf[4096];
2282 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2284 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2285 packmsg_add_str(&inv, name);
2286 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2287 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2289 /* TODO: Add several host config files to bootstrap connections.
2290 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2291 * and are not blacklisted.
2293 config_t configs[5] = {NULL};
2296 if(config_read(mesh, "current", mesh->self->name, &configs[count], mesh->config_key)) {
2300 /* Append host config files to the invitation file */
2301 packmsg_add_array(&inv, count);
2303 for(int i = 0; i < count; i++) {
2304 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2305 config_free(&configs[i]);
2308 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2310 if(!invitation_write(mesh, "current", cookiehash, &config, mesh->config_key)) {
2311 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2312 meshlink_errno = MESHLINK_ESTORAGE;
2313 pthread_mutex_unlock(&(mesh->mesh_mutex));
2317 // Create an URL from the local address, key hash and cookie
2319 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2322 pthread_mutex_unlock(&(mesh->mesh_mutex));
2326 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2327 return meshlink_invite_ex(mesh, submesh, name, 0);
2330 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2331 if(!mesh || !invitation) {
2332 meshlink_errno = MESHLINK_EINVAL;
2336 pthread_mutex_lock(&(mesh->mesh_mutex));
2338 //Before doing meshlink_join make sure we are not connected to another mesh
2339 if(mesh->threadstarted) {
2340 logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
2341 meshlink_errno = MESHLINK_EINVAL;
2342 pthread_mutex_unlock(&(mesh->mesh_mutex));
2346 // 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.
2347 if(mesh->nodes->count > 1) {
2348 logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
2349 meshlink_errno = MESHLINK_EINVAL;
2350 pthread_mutex_unlock(&(mesh->mesh_mutex));
2354 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2355 char copy[strlen(invitation) + 1];
2356 strcpy(copy, invitation);
2358 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2360 char *slash = strchr(copy, '/');
2368 if(strlen(slash) != 48) {
2372 char *address = copy;
2375 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2379 // Generate a throw-away key for the invitation.
2380 ecdsa_t *key = ecdsa_generate();
2383 meshlink_errno = MESHLINK_EINTERNAL;
2384 pthread_mutex_unlock(&(mesh->mesh_mutex));
2388 char *b64key = ecdsa_get_base64_public_key(key);
2392 while(address && *address) {
2393 // We allow commas in the address part to support multiple addresses in one invitation URL.
2394 comma = strchr(address, ',');
2400 // Split of the port
2401 port = strrchr(address, ':');
2409 // IPv6 address are enclosed in brackets, per RFC 3986
2410 if(*address == '[') {
2412 char *bracket = strchr(address, ']');
2425 // Connect to the meshlink daemon mentioned in the URL.
2426 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2429 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2430 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2432 if(mesh->sock == -1) {
2433 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2434 meshlink_errno = MESHLINK_ENETWORK;
2438 set_timeout(mesh->sock, 5000);
2440 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2441 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2442 meshlink_errno = MESHLINK_ENETWORK;
2443 closesocket(mesh->sock);
2451 meshlink_errno = MESHLINK_ERESOLV;
2454 if(mesh->sock != -1 || !comma) {
2461 if(mesh->sock == -1) {
2462 pthread_mutex_unlock(&mesh->mesh_mutex);
2466 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2468 // Tell him we have an invitation, and give him our throw-away key.
2472 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2473 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2474 closesocket(mesh->sock);
2475 meshlink_errno = MESHLINK_ENETWORK;
2476 pthread_mutex_unlock(&(mesh->mesh_mutex));
2482 char hisname[4096] = "";
2483 int code, hismajor, hisminor = 0;
2485 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) {
2486 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2487 closesocket(mesh->sock);
2488 meshlink_errno = MESHLINK_ENETWORK;
2489 pthread_mutex_unlock(&(mesh->mesh_mutex));
2493 // Check if the hash of the key he gave us matches the hash in the URL.
2494 char *fingerprint = mesh->line + 2;
2497 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2498 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2499 meshlink_errno = MESHLINK_EINTERNAL;
2500 pthread_mutex_unlock(&(mesh->mesh_mutex));
2504 if(memcmp(hishash, mesh->hash, 18)) {
2505 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2506 meshlink_errno = MESHLINK_EPEER;
2507 pthread_mutex_unlock(&(mesh->mesh_mutex));
2512 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2515 meshlink_errno = MESHLINK_EINTERNAL;
2516 pthread_mutex_unlock(&(mesh->mesh_mutex));
2520 // Start an SPTPS session
2521 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2522 meshlink_errno = MESHLINK_EINTERNAL;
2523 pthread_mutex_unlock(&(mesh->mesh_mutex));
2527 // Feed rest of input buffer to SPTPS
2528 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2529 meshlink_errno = MESHLINK_EPEER;
2530 pthread_mutex_unlock(&(mesh->mesh_mutex));
2536 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2538 if(errno == EINTR) {
2542 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2543 meshlink_errno = MESHLINK_ENETWORK;
2544 pthread_mutex_unlock(&(mesh->mesh_mutex));
2548 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2549 meshlink_errno = MESHLINK_EPEER;
2550 pthread_mutex_unlock(&(mesh->mesh_mutex));
2555 sptps_stop(&mesh->sptps);
2558 closesocket(mesh->sock);
2560 if(!mesh->success) {
2561 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2562 meshlink_errno = MESHLINK_EPEER;
2563 pthread_mutex_unlock(&(mesh->mesh_mutex));
2567 pthread_mutex_unlock(&(mesh->mesh_mutex));
2571 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2572 meshlink_errno = MESHLINK_EINVAL;
2573 pthread_mutex_unlock(&(mesh->mesh_mutex));
2577 char *meshlink_export(meshlink_handle_t *mesh) {
2579 meshlink_errno = MESHLINK_EINVAL;
2583 // Create a config file on the fly.
2586 packmsg_output_t out = {buf, sizeof(buf)};
2587 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2588 packmsg_add_str(&out, mesh->name);
2589 packmsg_add_str(&out, CORE_MESH);
2591 pthread_mutex_lock(&(mesh->mesh_mutex));
2593 packmsg_add_int32(&out, mesh->self->devclass);
2594 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2595 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2596 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2600 for(uint32_t i = 0; i < 5; i++) {
2601 if(mesh->self->recent[i].sa.sa_family) {
2608 packmsg_add_array(&out, count);
2610 for(uint32_t i = 0; i < count; i++) {
2611 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2614 pthread_mutex_unlock(&(mesh->mesh_mutex));
2616 if(!packmsg_output_ok(&out)) {
2617 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2618 meshlink_errno = MESHLINK_EINTERNAL;
2622 // Prepare a base64-encoded packmsg array containing our config file
2624 uint32_t len = packmsg_output_size(&out, buf);
2625 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2626 uint8_t *buf2 = xmalloc(len2);
2627 packmsg_output_t out2 = {buf2, len2};
2628 packmsg_add_array(&out2, 1);
2629 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2631 if(!packmsg_output_ok(&out2)) {
2632 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2633 meshlink_errno = MESHLINK_EINTERNAL;
2638 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2640 return (char *)buf2;
2643 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2644 if(!mesh || !data) {
2645 meshlink_errno = MESHLINK_EINVAL;
2649 size_t datalen = strlen(data);
2650 uint8_t *buf = xmalloc(datalen);
2651 int buflen = b64decode(data, buf, datalen);
2654 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2655 meshlink_errno = MESHLINK_EPEER;
2659 packmsg_input_t in = {buf, buflen};
2660 uint32_t count = packmsg_get_array(&in);
2663 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2664 meshlink_errno = MESHLINK_EPEER;
2668 pthread_mutex_lock(&(mesh->mesh_mutex));
2672 uint32_t len = packmsg_get_bin_raw(&in, &data);
2678 packmsg_input_t in2 = {data, len};
2679 uint32_t version = packmsg_get_uint32(&in2);
2680 char *name = packmsg_get_str_dup(&in2);
2682 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2684 packmsg_input_invalidate(&in);
2688 if(!check_id(name)) {
2693 node_t *n = lookup_node(mesh, name);
2696 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2704 config_t config = {data, len};
2706 if(!node_read_from_config(mesh, n, &config)) {
2708 packmsg_input_invalidate(&in);
2712 config_write(mesh, "current", n->name, &config, mesh->config_key);
2716 pthread_mutex_unlock(&(mesh->mesh_mutex));
2718 if(!packmsg_done(&in)) {
2719 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2720 meshlink_errno = MESHLINK_EPEER;
2724 if(!config_sync(mesh, "current")) {
2731 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2732 if(!mesh || !node) {
2733 meshlink_errno = MESHLINK_EINVAL;
2737 pthread_mutex_lock(&(mesh->mesh_mutex));
2742 if(n == mesh->self) {
2743 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2744 meshlink_errno = MESHLINK_EINVAL;
2745 pthread_mutex_unlock(&(mesh->mesh_mutex));
2749 if(n->status.blacklisted) {
2750 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2751 pthread_mutex_unlock(&(mesh->mesh_mutex));
2755 n->status.blacklisted = true;
2756 node_write_config(mesh, n);
2757 config_sync(mesh, "current");
2759 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2761 //Immediately terminate any connections we have with the blacklisted node
2762 for list_each(connection_t, c, mesh->connections) {
2764 terminate_connection(mesh, c, c->status.active);
2768 utcp_abort_all_connections(n->utcp);
2774 n->status.udp_confirmed = false;
2776 if(n->status.reachable) {
2777 update_node_status(mesh, n);
2780 pthread_mutex_unlock(&(mesh->mesh_mutex));
2783 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2784 if(!mesh || !node) {
2785 meshlink_errno = MESHLINK_EINVAL;
2789 pthread_mutex_lock(&(mesh->mesh_mutex));
2791 node_t *n = (node_t *)node;
2793 if(!n->status.blacklisted) {
2794 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2795 meshlink_errno = MESHLINK_EINVAL;
2796 pthread_mutex_unlock(&(mesh->mesh_mutex));
2800 n->status.blacklisted = false;
2801 node_write_config(mesh, n);
2802 config_sync(mesh, "current");
2804 pthread_mutex_unlock(&(mesh->mesh_mutex));
2808 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2809 mesh->default_blacklist = blacklist;
2812 /* Hint that a hostname may be found at an address
2813 * See header file for detailed comment.
2815 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2816 if(!mesh || !node || !addr) {
2817 meshlink_errno = EINVAL;
2821 pthread_mutex_lock(&(mesh->mesh_mutex));
2823 node_t *n = (node_t *)node;
2824 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2825 memcpy(n->recent, addr, SALEN(*addr));
2826 node_write_config(mesh, n);
2828 pthread_mutex_unlock(&(mesh->mesh_mutex));
2829 // @TODO do we want to fire off a connection attempt right away?
2832 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2834 node_t *n = utcp->priv;
2835 meshlink_handle_t *mesh = n->mesh;
2836 return mesh->channel_accept_cb;
2839 static void aio_signal(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_aio_buffer_t *aio) {
2841 if(aio->cb.buffer) {
2842 aio->cb.buffer(mesh, channel, aio->data, aio->len, aio->priv);
2846 aio->cb.fd(mesh, channel, aio->fd, aio->done, aio->priv);
2851 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2852 meshlink_channel_t *channel = connection->priv;
2858 node_t *n = channel->node;
2859 meshlink_handle_t *mesh = n->mesh;
2861 if(n->status.destroyed) {
2862 meshlink_channel_close(mesh, channel);
2866 const char *p = data;
2869 while(channel->aio_receive) {
2870 meshlink_aio_buffer_t *aio = channel->aio_receive;
2871 size_t todo = aio->len - aio->done;
2878 memcpy((char *)aio->data + aio->done, p, todo);
2880 ssize_t result = write(aio->fd, p, todo);
2889 if(aio->done == aio->len) {
2890 channel->aio_receive = aio->next;
2891 aio_signal(mesh, channel, aio);
2903 if(channel->receive_cb) {
2904 channel->receive_cb(mesh, channel, p, left);
2910 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2911 node_t *n = utcp_connection->utcp->priv;
2917 meshlink_handle_t *mesh = n->mesh;
2919 if(!mesh->channel_accept_cb) {
2923 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2925 channel->c = utcp_connection;
2927 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2928 utcp_accept(utcp_connection, channel_recv, channel);
2934 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2935 node_t *n = utcp->priv;
2937 if(n->status.destroyed) {
2941 meshlink_handle_t *mesh = n->mesh;
2942 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2945 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2946 if(!mesh || !channel) {
2947 meshlink_errno = MESHLINK_EINVAL;
2951 channel->receive_cb = cb;
2954 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2956 node_t *n = (node_t *)source;
2962 utcp_recv(n->utcp, data, len);
2965 static void channel_poll(struct utcp_connection *connection, size_t len) {
2966 meshlink_channel_t *channel = connection->priv;
2972 node_t *n = channel->node;
2973 meshlink_handle_t *mesh = n->mesh;
2974 meshlink_aio_buffer_t *aio = channel->aio_send;
2977 /* We at least one AIO buffer. Send as much as possible form the first buffer. */
2978 size_t left = aio->len - aio->done;
2986 sent = utcp_send(connection, (char *)aio->data + aio->done, len);
2989 size_t todo = utcp_get_sndbuf_free(connection);
2995 if(todo > sizeof(buf)) {
2999 ssize_t result = read(aio->fd, buf, todo);
3002 sent = utcp_send(connection, buf, result);
3012 /* If the buffer is now completely sent, call the callback and dispose of it. */
3013 if(aio->done >= aio->len) {
3014 channel->aio_send = aio->next;
3015 aio_signal(mesh, channel, aio);
3019 if(channel->poll_cb) {
3020 channel->poll_cb(mesh, channel, len);
3022 utcp_set_poll_cb(connection, NULL);
3027 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
3029 channel->poll_cb = cb;
3030 utcp_set_poll_cb(channel->c, (cb || channel->aio_send) ? channel_poll : NULL);
3033 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
3035 meshlink_errno = MESHLINK_EINVAL;
3039 pthread_mutex_lock(&mesh->mesh_mutex);
3040 mesh->channel_accept_cb = cb;
3041 mesh->receive_cb = channel_receive;
3043 for splay_each(node_t, n, mesh->nodes) {
3044 if(!n->utcp && n != mesh->self) {
3045 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3049 pthread_mutex_unlock(&mesh->mesh_mutex);
3052 void meshlink_set_channel_sndbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3056 meshlink_errno = MESHLINK_EINVAL;
3060 pthread_mutex_lock(&mesh->mesh_mutex);
3061 utcp_set_sndbuf(channel->c, size);
3062 pthread_mutex_unlock(&mesh->mesh_mutex);
3065 void meshlink_set_channel_rcvbuf(meshlink_handle_t *mesh, meshlink_channel_t *channel, size_t size) {
3069 meshlink_errno = MESHLINK_EINVAL;
3073 pthread_mutex_lock(&mesh->mesh_mutex);
3074 utcp_set_rcvbuf(channel->c, size);
3075 pthread_mutex_unlock(&mesh->mesh_mutex);
3078 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) {
3080 abort(); // TODO: handle non-NULL data
3083 if(!mesh || !node) {
3084 meshlink_errno = MESHLINK_EINVAL;
3088 node_t *n = (node_t *)node;
3091 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3092 mesh->receive_cb = channel_receive;
3095 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3100 if(n->status.blacklisted) {
3101 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
3105 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
3107 channel->receive_cb = cb;
3108 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
3111 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
3119 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) {
3120 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
3123 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
3124 if(!mesh || !channel) {
3125 meshlink_errno = MESHLINK_EINVAL;
3129 utcp_shutdown(channel->c, direction);
3132 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3133 if(!mesh || !channel) {
3134 meshlink_errno = MESHLINK_EINVAL;
3138 utcp_close(channel->c);
3140 /* Clean up any outstanding AIO buffers. */
3141 for(meshlink_aio_buffer_t *aio = channel->aio_send, *next; aio; aio = next) {
3143 aio_signal(mesh, channel, aio);
3147 for(meshlink_aio_buffer_t *aio = channel->aio_receive, *next; aio; aio = next) {
3149 aio_signal(mesh, channel, aio);
3156 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
3157 if(!mesh || !channel) {
3158 meshlink_errno = MESHLINK_EINVAL;
3167 meshlink_errno = MESHLINK_EINVAL;
3171 // TODO: more finegrained locking.
3172 // Ideally we want to put the data into the UTCP connection's send buffer.
3173 // Then, preferably only if there is room in the receiver window,
3174 // kick the meshlink thread to go send packets.
3178 pthread_mutex_lock(&mesh->mesh_mutex);
3180 /* Disallow direct calls to utcp_send() while we still have AIO active. */
3181 if(channel->aio_send) {
3184 retval = utcp_send(channel->c, data, len);
3187 pthread_mutex_unlock(&mesh->mesh_mutex);
3190 meshlink_errno = MESHLINK_ENETWORK;
3196 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) {
3197 if(!mesh || !channel) {
3198 meshlink_errno = MESHLINK_EINVAL;
3203 meshlink_errno = MESHLINK_EINVAL;
3207 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3210 aio->cb.buffer = cb;
3213 pthread_mutex_lock(&mesh->mesh_mutex);
3215 /* Append the AIO buffer descriptor to the end of the chain */
3216 meshlink_aio_buffer_t **p = &channel->aio_send;
3224 /* Ensure the poll callback is set, and call it right now to push data if possible */
3225 utcp_set_poll_cb(channel->c, channel_poll);
3226 channel_poll(channel->c, len);
3228 pthread_mutex_unlock(&mesh->mesh_mutex);
3233 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) {
3234 if(!mesh || !channel) {
3235 meshlink_errno = MESHLINK_EINVAL;
3239 if(!len || fd == -1) {
3240 meshlink_errno = MESHLINK_EINVAL;
3244 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3250 pthread_mutex_lock(&mesh->mesh_mutex);
3252 /* Append the AIO buffer descriptor to the end of the chain */
3253 meshlink_aio_buffer_t **p = &channel->aio_send;
3261 /* Ensure the poll callback is set, and call it right now to push data if possible */
3262 utcp_set_poll_cb(channel->c, channel_poll);
3263 channel_poll(channel->c, len);
3265 pthread_mutex_unlock(&mesh->mesh_mutex);
3270 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) {
3271 if(!mesh || !channel) {
3272 meshlink_errno = MESHLINK_EINVAL;
3277 meshlink_errno = MESHLINK_EINVAL;
3281 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3284 aio->cb.buffer = cb;
3287 pthread_mutex_lock(&mesh->mesh_mutex);
3289 /* Append the AIO buffer descriptor to the end of the chain */
3290 meshlink_aio_buffer_t **p = &channel->aio_receive;
3298 pthread_mutex_unlock(&mesh->mesh_mutex);
3303 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) {
3304 if(!mesh || !channel) {
3305 meshlink_errno = MESHLINK_EINVAL;
3309 if(!len || fd == -1) {
3310 meshlink_errno = MESHLINK_EINVAL;
3314 meshlink_aio_buffer_t *aio = xzalloc(sizeof(*aio));
3320 pthread_mutex_lock(&mesh->mesh_mutex);
3322 /* Append the AIO buffer descriptor to the end of the chain */
3323 meshlink_aio_buffer_t **p = &channel->aio_receive;
3331 pthread_mutex_unlock(&mesh->mesh_mutex);
3336 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3337 if(!mesh || !channel) {
3338 meshlink_errno = MESHLINK_EINVAL;
3342 return channel->c->flags;
3345 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3346 if(!mesh || !channel) {
3347 meshlink_errno = MESHLINK_EINVAL;
3351 return utcp_get_sendq(channel->c);
3354 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
3355 if(!mesh || !channel) {
3356 meshlink_errno = MESHLINK_EINVAL;
3360 return utcp_get_recvq(channel->c);
3363 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
3364 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
3365 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
3368 if(mesh->node_status_cb) {
3369 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
3373 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
3374 if(!mesh->node_duplicate_cb || n->status.duplicate) {
3378 n->status.duplicate = true;
3379 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
3382 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
3386 meshlink_errno = MESHLINK_EINVAL;
3390 pthread_mutex_lock(&mesh->mesh_mutex);
3392 if(mesh->discovery == enable) {
3396 if(mesh->threadstarted) {
3398 discovery_start(mesh);
3400 discovery_stop(mesh);
3404 mesh->discovery = enable;
3407 pthread_mutex_unlock(&mesh->mesh_mutex);
3411 meshlink_errno = MESHLINK_ENOTSUP;
3415 void meshlink_set_dev_class_timeouts(meshlink_handle_t *mesh, dev_class_t devclass, int pinginterval, int pingtimeout) {
3416 if(!mesh || devclass < 0 || devclass >= DEV_CLASS_COUNT) {
3417 meshlink_errno = EINVAL;
3421 if(pinginterval < 1 || pingtimeout < 1 || pingtimeout > pinginterval) {
3422 meshlink_errno = EINVAL;
3426 pthread_mutex_lock(&mesh->mesh_mutex);
3427 mesh->dev_class_traits[devclass].pinginterval = pinginterval;
3428 mesh->dev_class_traits[devclass].pingtimeout = pingtimeout;
3429 pthread_mutex_unlock(&mesh->mesh_mutex);
3432 void handle_network_change(meshlink_handle_t *mesh, bool online) {
3435 if(!mesh->connections) {
3442 static void __attribute__((constructor)) meshlink_init(void) {
3445 randomize(&seed, sizeof(seed));
3449 static void __attribute__((destructor)) meshlink_exit(void) {