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"
41 #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 {
128 static void *socket_in_netns_thread(void *arg) {
129 struct socket_in_netns_params *params = arg;
131 if(setns(params->netns, CLONE_NEWNET) == -1) {
132 meshlink_errno = MESHLINK_EINVAL;
134 params->fd = socket(params->domain, params->type, params->protocol);
140 static int socket_in_netns(int domain, int type, int protocol, int netns) {
142 return socket(domain, type, protocol);
145 struct socket_in_netns_params params = {domain, type, protocol, netns, -1};
149 if(pthread_create(&thr, NULL, socket_in_netns_thread, ¶ms) == 0) {
150 pthread_join(thr, NULL);
156 // Find out what local address a socket would use if we connect to the given address.
157 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
158 // of both endpoints, but this will actually not send any UDP packet.
159 static bool getlocaladdr(char *destaddr, struct sockaddr *sn, socklen_t *sl, int netns) {
160 struct addrinfo *rai = NULL;
161 const struct addrinfo hint = {
162 .ai_family = AF_UNSPEC,
163 .ai_socktype = SOCK_DGRAM,
164 .ai_protocol = IPPROTO_UDP,
167 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
171 int sock = socket_in_netns(rai->ai_family, rai->ai_socktype, rai->ai_protocol, netns);
178 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
186 if(getsockname(sock, sn, sl)) {
195 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen, int netns) {
196 struct sockaddr_storage sn;
197 socklen_t sl = sizeof(sn);
199 if(!getlocaladdr(destaddr, (struct sockaddr *)&sn, &sl, netns)) {
203 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
210 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
211 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
214 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
215 char *hostname = NULL;
217 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
218 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
219 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
222 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
223 if(family != AF_UNSPEC && aip->ai_family != family) {
227 int s = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
230 set_timeout(s, 5000);
232 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
239 send(s, request, sizeof(request) - 1, 0);
240 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
245 if(line[len - 1] == '\n') {
249 char *p = strrchr(line, '\n');
252 hostname = xstrdup(p + 1);
268 // Check that the hostname is reasonable
269 if(hostname && !is_valid_hostname(hostname)) {
275 meshlink_errno = MESHLINK_ERESOLV;
281 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
284 // Determine address of the local interface used for outgoing connections.
285 char localaddr[NI_MAXHOST];
286 bool success = false;
288 if(family == AF_INET) {
289 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr), mesh->netns);
290 } else if(family == AF_INET6) {
291 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
295 meshlink_errno = MESHLINK_ENETWORK;
299 return xstrdup(localaddr);
302 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
303 for(int i = 0; i < n; i++) {
308 // Ignore duplicate hostnames
311 for(int j = 0; j < i; j++) {
316 if(strcmp(host[i], host[j])) {
320 if(strcmp(port[i], port[j])) {
338 // This gets the hostname part for use in invitation URLs
339 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
340 char *hostname[4] = {NULL};
341 char *port[4] = {NULL};
342 char *hostport = NULL;
344 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
345 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
348 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
349 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
352 // Add local addresses if requested
353 if(flags & MESHLINK_INVITE_LOCAL) {
354 if(flags & MESHLINK_INVITE_IPV4) {
355 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
358 if(flags & MESHLINK_INVITE_IPV6) {
359 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
363 // Add public/canonical addresses if requested
364 if(flags & MESHLINK_INVITE_PUBLIC) {
365 // Try the CanonicalAddress first
366 get_canonical_address(mesh->self, &hostname[2], &port[2]);
369 if(flags & MESHLINK_INVITE_IPV4) {
370 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
373 if(flags & MESHLINK_INVITE_IPV6) {
374 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
379 for(int i = 0; i < 4; i++) {
380 // Ensure we always have a port number
381 if(hostname[i] && !port[i]) {
382 port[i] = xstrdup(mesh->myport);
386 remove_duplicate_hostnames(hostname, port, 4);
388 if(!(flags & MESHLINK_INVITE_NUMERIC)) {
389 for(int i = 0; i < 4; i++) {
394 // Convert what we have to a sockaddr
395 struct addrinfo *ai_in, *ai_out;
396 struct addrinfo hint = {
397 .ai_family = AF_UNSPEC,
398 .ai_flags = AI_NUMERICSERV,
399 .ai_socktype = SOCK_STREAM,
401 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
407 // Convert it to a hostname
408 char resolved_host[NI_MAXHOST];
409 char resolved_port[NI_MAXSERV];
410 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
417 // Convert the hostname back to a sockaddr
418 hint.ai_family = ai_in->ai_family;
419 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
426 // Check if it's still the same sockaddr
427 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
429 freeaddrinfo(ai_out);
433 // Yes: replace the hostname with the resolved one
435 hostname[i] = xstrdup(resolved_host);
438 freeaddrinfo(ai_out);
442 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
443 remove_duplicate_hostnames(hostname, port, 4);
445 // Concatenate all unique address to the hostport string
446 for(int i = 0; i < 4; i++) {
451 // Ensure we have the same addresses in our own host config file.
453 xasprintf(&tmphostport, "%s %s", hostname[i], port[i]);
455 //config_add_string(&mesh->config, "Address", tmphostport);
458 // Append the address to the hostport string
460 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
462 hostport = newhostport;
471 static bool try_bind(int port) {
472 struct addrinfo *ai = NULL;
473 struct addrinfo hint = {
474 .ai_flags = AI_PASSIVE,
475 .ai_family = AF_UNSPEC,
476 .ai_socktype = SOCK_STREAM,
477 .ai_protocol = IPPROTO_TCP,
481 snprintf(portstr, sizeof(portstr), "%d", port);
483 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
488 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
489 int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
496 int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
509 int check_port(meshlink_handle_t *mesh) {
510 for(int i = 0; i < 1000; i++) {
511 int port = 0x1000 + (rand() & 0x7fff);
515 xasprintf(&mesh->myport, "%d", port);
520 meshlink_errno = MESHLINK_ENETWORK;
521 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
525 static bool write_main_config_files(meshlink_handle_t *mesh) {
528 /* Write the main config file */
529 packmsg_output_t out = {buf, sizeof buf};
531 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
532 packmsg_add_str(&out, mesh->name);
533 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
534 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
535 packmsg_add_uint16(&out, atoi(mesh->myport));
537 if(!packmsg_output_ok(&out)) {
541 config_t config = {buf, packmsg_output_size(&out, buf)};
543 if(!main_config_write(mesh, &config)) {
547 /* Write our own host config file */
548 if(!node_write_config(mesh, mesh->self)) {
555 static bool finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
556 packmsg_input_t in = {buf, len};
557 uint32_t version = packmsg_get_uint32(&in);
559 if(version != MESHLINK_INVITATION_VERSION) {
560 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
564 char *name = packmsg_get_str_dup(&in);
565 packmsg_skip_element(&in); /* submesh */
566 int32_t devclass = packmsg_get_int32(&in);
567 uint32_t count = packmsg_get_array(&in);
570 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
574 if(!check_id(name)) {
575 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
581 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
587 free(mesh->self->name);
589 mesh->self->name = xstrdup(name);
590 mesh->self->devclass = devclass;
592 // Initialize configuration directory
593 if(!config_init(mesh)) {
597 if(!write_main_config_files(mesh)) {
601 // Write host config files
604 uint32_t len = packmsg_get_bin_raw(&in, &data);
607 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
611 packmsg_input_t in2 = {data, len};
612 uint32_t version = packmsg_get_uint32(&in2);
613 char *name = packmsg_get_str_dup(&in2);
615 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
617 packmsg_input_invalidate(&in);
621 if(!check_id(name)) {
626 if(!strcmp(name, mesh->name)) {
627 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
629 meshlink_errno = MESHLINK_EPEER;
633 node_t *n = new_node();
636 config_t config = {data, len};
638 if(!node_read_from_config(mesh, n, &config)) {
640 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
641 meshlink_errno = MESHLINK_EPEER;
647 if(!config_write(mesh, n->name, &config)) {
652 sptps_send_record(&(mesh->sptps), 1, ecdsa_get_public_key(mesh->private_key), 32);
654 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
659 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
661 meshlink_handle_t *mesh = handle;
662 const char *ptr = data;
665 int result = send(mesh->sock, ptr, len, 0);
667 if(result == -1 && errno == EINTR) {
669 } else if(result <= 0) {
680 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
681 meshlink_handle_t *mesh = handle;
684 case SPTPS_HANDSHAKE:
685 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
688 return finalize_join(mesh, msg, len);
691 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
692 shutdown(mesh->sock, SHUT_RDWR);
693 mesh->success = true;
703 static bool recvline(meshlink_handle_t *mesh, size_t len) {
704 char *newline = NULL;
710 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
711 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
713 if(result == -1 && errno == EINTR) {
715 } else if(result <= 0) {
719 mesh->blen += result;
722 if((size_t)(newline - mesh->buffer) >= len) {
726 len = newline - mesh->buffer;
728 memcpy(mesh->line, mesh->buffer, len);
730 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
731 mesh->blen -= len + 1;
735 static bool sendline(int fd, char *format, ...) {
736 static char buffer[4096];
741 va_start(ap, format);
742 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
745 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
753 int result = send(fd, p, blen, MSG_NOSIGNAL);
755 if(result == -1 && errno == EINTR) {
757 } else if(result <= 0) {
768 static const char *errstr[] = {
769 [MESHLINK_OK] = "No error",
770 [MESHLINK_EINVAL] = "Invalid argument",
771 [MESHLINK_ENOMEM] = "Out of memory",
772 [MESHLINK_ENOENT] = "No such node",
773 [MESHLINK_EEXIST] = "Node already exists",
774 [MESHLINK_EINTERNAL] = "Internal error",
775 [MESHLINK_ERESOLV] = "Could not resolve hostname",
776 [MESHLINK_ESTORAGE] = "Storage error",
777 [MESHLINK_ENETWORK] = "Network error",
778 [MESHLINK_EPEER] = "Error communicating with peer",
779 [MESHLINK_ENOTSUP] = "Operation not supported",
780 [MESHLINK_EBUSY] = "MeshLink instance already in use",
783 const char *meshlink_strerror(meshlink_errno_t err) {
784 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
785 return "Invalid error code";
791 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
792 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
794 mesh->private_key = ecdsa_generate();
795 mesh->invitation_key = ecdsa_generate();
797 if(!mesh->private_key || !mesh->invitation_key) {
798 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
799 meshlink_errno = MESHLINK_EINTERNAL;
803 logger(mesh, MESHLINK_DEBUG, "Done.\n");
808 static struct timeval idle(event_loop_t *loop, void *data) {
810 meshlink_handle_t *mesh = data;
811 struct timeval t, tmin = {3600, 0};
813 for splay_each(node_t, n, mesh->nodes) {
818 t = utcp_timeout(n->utcp);
820 if(timercmp(&t, &tmin, <)) {
828 // Get our local address(es) by simulating connecting to an Internet host.
829 static void add_local_addresses(meshlink_handle_t *mesh) {
830 struct sockaddr_storage sn;
831 socklen_t sl = sizeof(sn);
835 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
836 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
837 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
844 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
845 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
846 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
850 static bool meshlink_setup(meshlink_handle_t *mesh) {
851 if(!config_init(mesh)) {
852 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s: %s\n", mesh->confbase, strerror(errno));
853 meshlink_errno = MESHLINK_ESTORAGE;
857 if(!ecdsa_keygen(mesh)) {
858 meshlink_errno = MESHLINK_EINTERNAL;
862 if(check_port(mesh) == 0) {
863 meshlink_errno = MESHLINK_ENETWORK;
867 /* Create a node for ourself */
869 mesh->self = new_node();
870 mesh->self->name = xstrdup(mesh->name);
871 mesh->self->devclass = mesh->devclass;
872 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
874 if(!write_main_config_files(mesh)) {
878 if(!main_config_lock(mesh)) {
879 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
880 meshlink_errno = MESHLINK_ESTORAGE;
887 static bool meshlink_read_config(meshlink_handle_t *mesh) {
888 // Open the configuration file and lock it
889 if(!main_config_lock(mesh)) {
890 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
891 meshlink_errno = MESHLINK_ESTORAGE;
897 if(!main_config_read(mesh, &config)) {
898 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
902 packmsg_input_t in = {config.buf, config.len};
903 const void *private_key;
904 const void *invitation_key;
906 uint32_t version = packmsg_get_uint32(&in);
907 char *name = packmsg_get_str_dup(&in);
908 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
909 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
910 uint16_t myport = packmsg_get_uint16(&in);
912 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
913 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
915 config_free(&config);
922 if(mesh->name && strcmp(mesh->name, name)) {
923 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
924 meshlink_errno = MESHLINK_ESTORAGE;
926 config_free(&config);
934 xasprintf(&mesh->myport, "%u", myport);
935 mesh->private_key = ecdsa_set_private_key(private_key);
936 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
937 config_free(&config);
939 /* Create a node for ourself and read our host configuration file */
941 mesh->self = new_node();
942 mesh->self->name = xstrdup(name);
943 mesh->self->devclass = mesh->devclass;
945 if(!node_read_public_key(mesh, mesh->self)) {
946 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
947 meshlink_errno = MESHLINK_ESTORAGE;
948 free_node(mesh->self);
956 static void *setup_network_in_netns_thread(void *arg) {
957 meshlink_handle_t *mesh = arg;
959 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
963 bool success = setup_network(mesh);
964 add_local_addresses(mesh);
965 return success ? arg : NULL;
968 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
969 if(!confbase || !*confbase) {
970 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
971 meshlink_errno = MESHLINK_EINVAL;
975 if(!appname || !*appname) {
976 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
977 meshlink_errno = MESHLINK_EINVAL;
981 if(strchr(appname, ' ')) {
982 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
983 meshlink_errno = MESHLINK_EINVAL;
987 if(!name || !*name) {
988 logger(NULL, MESHLINK_ERROR, "No name given!\n");
990 } else { //check name only if there is a name != NULL
991 if(!check_id(name)) {
992 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
993 meshlink_errno = MESHLINK_EINVAL;
998 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
999 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1000 meshlink_errno = MESHLINK_EINVAL;
1004 meshlink_open_params_t *params = xzalloc(sizeof * params);
1006 params->confbase = xstrdup(confbase);
1007 params->name = xstrdup(name);
1008 params->appname = xstrdup(appname);
1009 params->devclass = devclass;
1015 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1017 meshlink_errno = MESHLINK_EINVAL;
1021 params->netns = netns;
1026 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1028 meshlink_errno = MESHLINK_EINVAL;
1032 if((!key && keylen) || (key && !keylen)) {
1033 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1034 meshlink_errno = MESHLINK_EINVAL;
1039 params->keylen = keylen;
1044 void meshlink_open_params_free(meshlink_open_params_t *params) {
1046 meshlink_errno = MESHLINK_EINVAL;
1050 free(params->confbase);
1052 free(params->appname);
1057 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1058 if(!confbase || !*confbase) {
1059 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1060 meshlink_errno = MESHLINK_EINVAL;
1064 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1065 meshlink_open_params_t params = {NULL};
1067 params.confbase = (char *)confbase;
1068 params.name = (char *)name;
1069 params.appname = (char *)appname;
1070 params.devclass = devclass;
1073 return meshlink_open_ex(¶ms);
1076 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) {
1077 if(!confbase || !*confbase) {
1078 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1079 meshlink_errno = MESHLINK_EINVAL;
1083 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1084 meshlink_open_params_t params = {NULL};
1086 params.confbase = (char *)confbase;
1087 params.name = (char *)name;
1088 params.appname = (char *)appname;
1089 params.devclass = devclass;
1092 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1096 return meshlink_open_ex(¶ms);
1099 meshlink_handle_t *meshlink_open_ephemeral(const char *name, const char *appname, dev_class_t devclass) {
1100 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1101 meshlink_open_params_t params = {NULL};
1103 params.name = (char *)name;
1104 params.appname = (char *)appname;
1105 params.devclass = devclass;
1108 return meshlink_open_ex(¶ms);
1111 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1112 // Validate arguments provided by the application
1113 bool usingname = false;
1115 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1117 if(!params->appname || !*params->appname) {
1118 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1119 meshlink_errno = MESHLINK_EINVAL;
1123 if(strchr(params->appname, ' ')) {
1124 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1125 meshlink_errno = MESHLINK_EINVAL;
1129 if(!params->name || !*params->name) {
1130 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1132 } else { //check name only if there is a name != NULL
1134 if(!check_id(params->name)) {
1135 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1136 meshlink_errno = MESHLINK_EINVAL;
1143 if((int)params->devclass < 0 || params->devclass > _DEV_CLASS_MAX) {
1144 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1145 meshlink_errno = MESHLINK_EINVAL;
1149 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1150 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1151 meshlink_errno = MESHLINK_EINVAL;
1155 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1157 if(params->confbase) {
1158 mesh->confbase = xstrdup(params->confbase);
1161 mesh->appname = xstrdup(params->appname);
1162 mesh->devclass = params->devclass;
1163 mesh->discovery = true;
1164 mesh->invitation_timeout = 604800; // 1 week
1165 mesh->netns = params->netns;
1166 mesh->submeshes = NULL;
1169 mesh->name = xstrdup(params->name);
1174 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1176 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1177 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1178 meshlink_close(mesh);
1179 meshlink_errno = MESHLINK_EINTERNAL;
1185 pthread_mutexattr_t attr;
1186 pthread_mutexattr_init(&attr);
1187 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1188 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1190 mesh->threadstarted = false;
1191 event_loop_init(&mesh->loop);
1192 mesh->loop.data = mesh;
1194 meshlink_queue_init(&mesh->outpacketqueue);
1196 // If no configuration exists yet, create it.
1198 if(!main_config_exists(mesh)) {
1199 if(!meshlink_setup(mesh)) {
1200 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1201 meshlink_close(mesh);
1205 if(!meshlink_read_config(mesh)) {
1206 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1207 meshlink_close(mesh);
1213 struct WSAData wsa_state;
1214 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1217 // Setup up everything
1218 // TODO: we should not open listening sockets yet
1220 bool success = false;
1222 if(mesh->netns != -1) {
1225 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1226 void *retval = NULL;
1227 success = pthread_join(thr, &retval) == 0 && retval;
1230 success = setup_network(mesh);
1231 add_local_addresses(mesh);
1235 meshlink_close(mesh);
1236 meshlink_errno = MESHLINK_ENETWORK;
1240 add_local_addresses(mesh);
1241 node_write_config(mesh, mesh->self);
1243 idle_set(&mesh->loop, idle, mesh);
1245 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1249 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1250 meshlink_submesh_t *s = NULL;
1253 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1254 meshlink_errno = MESHLINK_EINVAL;
1258 if(!submesh || !*submesh) {
1259 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1260 meshlink_errno = MESHLINK_EINVAL;
1265 pthread_mutex_lock(&(mesh->mesh_mutex));
1267 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1269 pthread_mutex_unlock(&(mesh->mesh_mutex));
1274 static void *meshlink_main_loop(void *arg) {
1275 meshlink_handle_t *mesh = arg;
1277 if(mesh->netns != -1) {
1278 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1283 pthread_mutex_lock(&(mesh->mesh_mutex));
1285 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1287 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1289 pthread_mutex_unlock(&(mesh->mesh_mutex));
1293 bool meshlink_start(meshlink_handle_t *mesh) {
1295 assert(mesh->private_key);
1298 meshlink_errno = MESHLINK_EINVAL;
1302 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1304 pthread_mutex_lock(&(mesh->mesh_mutex));
1306 if(mesh->threadstarted) {
1307 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1308 pthread_mutex_unlock(&(mesh->mesh_mutex));
1312 if(mesh->listen_socket[0].tcp.fd < 0) {
1313 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1314 meshlink_errno = MESHLINK_ENETWORK;
1318 mesh->thedatalen = 0;
1320 // TODO: open listening sockets first
1322 //Check that a valid name is set
1324 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1325 meshlink_errno = MESHLINK_EINVAL;
1326 pthread_mutex_unlock(&(mesh->mesh_mutex));
1330 init_outgoings(mesh);
1332 // Start the main thread
1334 event_loop_start(&mesh->loop);
1336 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1337 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1338 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1339 meshlink_errno = MESHLINK_EINTERNAL;
1340 event_loop_stop(&mesh->loop);
1341 pthread_mutex_unlock(&(mesh->mesh_mutex));
1345 mesh->threadstarted = true;
1349 if(mesh->discovery) {
1350 discovery_start(mesh);
1355 assert(mesh->self->ecdsa);
1356 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1359 pthread_mutex_unlock(&(mesh->mesh_mutex));
1363 void meshlink_stop(meshlink_handle_t *mesh) {
1365 meshlink_errno = MESHLINK_EINVAL;
1369 pthread_mutex_lock(&(mesh->mesh_mutex));
1370 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1375 if(mesh->discovery) {
1376 discovery_stop(mesh);
1381 // Shut down the main thread
1382 event_loop_stop(&mesh->loop);
1384 // Send ourselves a UDP packet to kick the event loop
1385 for(int i = 0; i < mesh->listen_sockets; i++) {
1387 socklen_t salen = sizeof(sa.sa);
1389 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1390 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1394 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1395 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1399 if(mesh->threadstarted) {
1400 // Wait for the main thread to finish
1401 pthread_mutex_unlock(&(mesh->mesh_mutex));
1402 pthread_join(mesh->thread, NULL);
1403 pthread_mutex_lock(&(mesh->mesh_mutex));
1405 mesh->threadstarted = false;
1408 // Close all metaconnections
1409 if(mesh->connections) {
1410 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1412 connection_t *c = node->data;
1414 terminate_connection(mesh, c, false);
1418 exit_outgoings(mesh);
1420 // Write out any changed node config files
1422 for splay_each(node_t, n, mesh->nodes) {
1423 if(n->status.dirty) {
1424 node_write_config(mesh, n);
1425 n->status.dirty = false;
1430 pthread_mutex_unlock(&(mesh->mesh_mutex));
1433 void meshlink_close(meshlink_handle_t *mesh) {
1435 meshlink_errno = MESHLINK_EINVAL;
1439 // stop can be called even if mesh has not been started
1440 meshlink_stop(mesh);
1442 // lock is not released after this
1443 pthread_mutex_lock(&(mesh->mesh_mutex));
1445 // Close and free all resources used.
1447 close_network_connections(mesh);
1449 logger(mesh, MESHLINK_INFO, "Terminating");
1451 event_loop_exit(&mesh->loop);
1455 if(mesh->confbase) {
1461 ecdsa_free(mesh->invitation_key);
1463 if(mesh->netns != -1) {
1468 free(mesh->appname);
1469 free(mesh->confbase);
1470 free(mesh->config_key);
1471 ecdsa_free(mesh->private_key);
1472 pthread_mutex_destroy(&(mesh->mesh_mutex));
1474 main_config_unlock(mesh);
1476 memset(mesh, 0, sizeof(*mesh));
1481 bool meshlink_destroy(const char *confbase) {
1483 meshlink_errno = MESHLINK_EINVAL;
1487 return config_destroy(confbase);
1490 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1492 meshlink_errno = MESHLINK_EINVAL;
1496 pthread_mutex_lock(&(mesh->mesh_mutex));
1497 mesh->receive_cb = cb;
1498 pthread_mutex_unlock(&(mesh->mesh_mutex));
1501 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1503 meshlink_errno = MESHLINK_EINVAL;
1507 pthread_mutex_lock(&(mesh->mesh_mutex));
1508 mesh->node_status_cb = cb;
1509 pthread_mutex_unlock(&(mesh->mesh_mutex));
1512 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1514 meshlink_errno = MESHLINK_EINVAL;
1518 pthread_mutex_lock(&(mesh->mesh_mutex));
1519 mesh->node_duplicate_cb = cb;
1520 pthread_mutex_unlock(&(mesh->mesh_mutex));
1523 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1525 pthread_mutex_lock(&(mesh->mesh_mutex));
1527 mesh->log_level = cb ? level : 0;
1528 pthread_mutex_unlock(&(mesh->mesh_mutex));
1531 global_log_level = cb ? level : 0;
1535 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1536 meshlink_packethdr_t *hdr;
1538 // Validate arguments
1539 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1540 meshlink_errno = MESHLINK_EINVAL;
1549 meshlink_errno = MESHLINK_EINVAL;
1553 node_t *n = (node_t *)destination;
1555 if(n->status.blacklisted) {
1556 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1560 // Prepare the packet
1561 vpn_packet_t *packet = malloc(sizeof(*packet));
1564 meshlink_errno = MESHLINK_ENOMEM;
1568 packet->probe = false;
1569 packet->tcp = false;
1570 packet->len = len + sizeof(*hdr);
1572 hdr = (meshlink_packethdr_t *)packet->data;
1573 memset(hdr, 0, sizeof(*hdr));
1574 // leave the last byte as 0 to make sure strings are always
1575 // null-terminated if they are longer than the buffer
1576 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1577 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1579 memcpy(packet->data + sizeof(*hdr), data, len);
1582 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1584 meshlink_errno = MESHLINK_ENOMEM;
1588 // Notify event loop
1589 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1594 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1596 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1602 mesh->self->in_packets++;
1603 mesh->self->in_bytes += packet->len;
1604 route(mesh, mesh->self, packet);
1607 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1608 if(!mesh || !destination) {
1609 meshlink_errno = MESHLINK_EINVAL;
1613 pthread_mutex_lock(&(mesh->mesh_mutex));
1615 node_t *n = (node_t *)destination;
1617 if(!n->status.reachable) {
1618 pthread_mutex_unlock(&(mesh->mesh_mutex));
1621 } else if(n->mtuprobes > 30 && n->minmtu) {
1622 pthread_mutex_unlock(&(mesh->mesh_mutex));
1625 pthread_mutex_unlock(&(mesh->mesh_mutex));
1630 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1631 if(!mesh || !node) {
1632 meshlink_errno = MESHLINK_EINVAL;
1636 pthread_mutex_lock(&(mesh->mesh_mutex));
1638 node_t *n = (node_t *)node;
1640 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1641 meshlink_errno = MESHLINK_EINTERNAL;
1642 pthread_mutex_unlock(&(mesh->mesh_mutex));
1646 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1649 meshlink_errno = MESHLINK_EINTERNAL;
1652 pthread_mutex_unlock(&(mesh->mesh_mutex));
1656 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1658 meshlink_errno = MESHLINK_EINVAL;
1662 return (meshlink_node_t *)mesh->self;
1665 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1666 if(!mesh || !name) {
1667 meshlink_errno = MESHLINK_EINVAL;
1671 meshlink_node_t *node = NULL;
1673 pthread_mutex_lock(&(mesh->mesh_mutex));
1674 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1675 pthread_mutex_unlock(&(mesh->mesh_mutex));
1679 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1680 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1681 meshlink_errno = MESHLINK_EINVAL;
1685 meshlink_node_t **result;
1688 pthread_mutex_lock(&(mesh->mesh_mutex));
1690 *nmemb = mesh->nodes->count;
1691 result = realloc(nodes, *nmemb * sizeof(*nodes));
1694 meshlink_node_t **p = result;
1696 for splay_each(node_t, n, mesh->nodes) {
1697 *p++ = (meshlink_node_t *)n;
1702 meshlink_errno = MESHLINK_ENOMEM;
1705 pthread_mutex_unlock(&(mesh->mesh_mutex));
1710 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) {
1711 meshlink_node_t **result;
1713 pthread_mutex_lock(&(mesh->mesh_mutex));
1717 for splay_each(node_t, n, mesh->nodes) {
1718 if(true == search_node(n, condition)) {
1719 *nmemb = *nmemb + 1;
1725 pthread_mutex_unlock(&(mesh->mesh_mutex));
1729 result = realloc(nodes, *nmemb * sizeof(*nodes));
1732 meshlink_node_t **p = result;
1734 for splay_each(node_t, n, mesh->nodes) {
1735 if(true == search_node(n, condition)) {
1736 *p++ = (meshlink_node_t *)n;
1742 meshlink_errno = MESHLINK_ENOMEM;
1745 pthread_mutex_unlock(&(mesh->mesh_mutex));
1750 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1751 dev_class_t *devclass = (dev_class_t *)condition;
1753 if(*devclass == node->devclass) {
1760 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1761 if(condition == node->submesh) {
1768 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) {
1769 if(!mesh || ((int)devclass < 0) || (devclass > _DEV_CLASS_MAX) || !nmemb) {
1770 meshlink_errno = MESHLINK_EINVAL;
1774 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
1777 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
1778 if(!mesh || !submesh || !nmemb) {
1779 meshlink_errno = MESHLINK_EINVAL;
1783 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
1786 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
1787 if(!mesh || !node) {
1788 meshlink_errno = MESHLINK_EINVAL;
1792 dev_class_t devclass;
1794 pthread_mutex_lock(&(mesh->mesh_mutex));
1796 devclass = ((node_t *)node)->devclass;
1798 pthread_mutex_unlock(&(mesh->mesh_mutex));
1803 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
1804 if(!mesh || !node) {
1805 meshlink_errno = MESHLINK_EINVAL;
1809 node_t *n = (node_t *)node;
1811 meshlink_submesh_t *s;
1813 s = (meshlink_submesh_t *)n->submesh;
1818 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1819 if(!mesh || !data || !len || !signature || !siglen) {
1820 meshlink_errno = MESHLINK_EINVAL;
1824 if(*siglen < MESHLINK_SIGLEN) {
1825 meshlink_errno = MESHLINK_EINVAL;
1829 pthread_mutex_lock(&(mesh->mesh_mutex));
1831 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
1832 meshlink_errno = MESHLINK_EINTERNAL;
1833 pthread_mutex_unlock(&(mesh->mesh_mutex));
1837 *siglen = MESHLINK_SIGLEN;
1838 pthread_mutex_unlock(&(mesh->mesh_mutex));
1842 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1843 if(!mesh || !data || !len || !signature) {
1844 meshlink_errno = MESHLINK_EINVAL;
1848 if(siglen != MESHLINK_SIGLEN) {
1849 meshlink_errno = MESHLINK_EINVAL;
1853 pthread_mutex_lock(&(mesh->mesh_mutex));
1857 struct node_t *n = (struct node_t *)source;
1859 if(!node_read_public_key(mesh, n)) {
1860 meshlink_errno = MESHLINK_EINTERNAL;
1863 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1866 pthread_mutex_unlock(&(mesh->mesh_mutex));
1870 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1871 pthread_mutex_lock(&(mesh->mesh_mutex));
1873 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
1876 // TODO: Update invitation key if necessary?
1879 pthread_mutex_unlock(&(mesh->mesh_mutex));
1881 return mesh->invitation_key;
1884 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1885 if(!mesh || !node || !address) {
1886 meshlink_errno = MESHLINK_EINVAL;
1890 if(!is_valid_hostname(address)) {
1891 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1892 meshlink_errno = MESHLINK_EINVAL;
1896 if(port && !is_valid_port(port)) {
1897 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1898 meshlink_errno = MESHLINK_EINVAL;
1902 char *canonical_address;
1905 xasprintf(&canonical_address, "%s %s", address, port);
1907 canonical_address = xstrdup(address);
1910 pthread_mutex_lock(&(mesh->mesh_mutex));
1912 node_t *n = (node_t *)node;
1913 free(n->canonical_address);
1914 n->canonical_address = canonical_address;
1915 node_write_config(mesh, n);
1917 pthread_mutex_unlock(&(mesh->mesh_mutex));
1922 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1923 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
1926 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1928 meshlink_errno = MESHLINK_EINVAL;
1932 char *address = meshlink_get_external_address(mesh);
1938 bool rval = meshlink_add_address(mesh, address);
1944 int meshlink_get_port(meshlink_handle_t *mesh) {
1946 meshlink_errno = MESHLINK_EINVAL;
1951 meshlink_errno = MESHLINK_EINTERNAL;
1955 return atoi(mesh->myport);
1958 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1959 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1960 meshlink_errno = MESHLINK_EINVAL;
1964 if(mesh->myport && port == atoi(mesh->myport)) {
1968 if(!try_bind(port)) {
1969 meshlink_errno = MESHLINK_ENETWORK;
1975 pthread_mutex_lock(&(mesh->mesh_mutex));
1977 if(mesh->threadstarted) {
1978 meshlink_errno = MESHLINK_EINVAL;
1983 xasprintf(&mesh->myport, "%d", port);
1985 /* Write meshlink.conf with the updated port number */
1986 write_main_config_files(mesh);
1988 /* Close down the network. This also deletes mesh->self. */
1989 close_network_connections(mesh);
1991 /* Recreate mesh->self. */
1992 mesh->self = new_node();
1993 mesh->self->name = xstrdup(mesh->name);
1994 mesh->self->devclass = mesh->devclass;
1996 if(!node_read_public_key(mesh, mesh->self)) {
1997 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
1998 meshlink_errno = MESHLINK_ESTORAGE;
1999 free_node(mesh->self);
2001 } else if(!setup_network(mesh)) {
2002 meshlink_errno = MESHLINK_ENETWORK;
2008 pthread_mutex_unlock(&(mesh->mesh_mutex));
2013 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2014 mesh->invitation_timeout = timeout;
2017 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2018 meshlink_submesh_t *s = NULL;
2021 meshlink_errno = MESHLINK_EINVAL;
2026 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2029 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2030 meshlink_errno = MESHLINK_EINVAL;
2034 s = (meshlink_submesh_t *)mesh->self->submesh;
2037 pthread_mutex_lock(&(mesh->mesh_mutex));
2039 // Check validity of the new node's name
2040 if(!check_id(name)) {
2041 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2042 meshlink_errno = MESHLINK_EINVAL;
2043 pthread_mutex_unlock(&(mesh->mesh_mutex));
2047 // Ensure no host configuration file with that name exists
2048 if(config_exists(mesh, name)) {
2049 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2050 meshlink_errno = MESHLINK_EEXIST;
2051 pthread_mutex_unlock(&(mesh->mesh_mutex));
2055 // Ensure no other nodes know about this name
2056 if(meshlink_get_node(mesh, name)) {
2057 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2058 meshlink_errno = MESHLINK_EEXIST;
2059 pthread_mutex_unlock(&(mesh->mesh_mutex));
2063 // Get the local address
2064 char *address = get_my_hostname(mesh, flags);
2067 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2068 meshlink_errno = MESHLINK_ERESOLV;
2069 pthread_mutex_unlock(&(mesh->mesh_mutex));
2073 if(!refresh_invitation_key(mesh)) {
2074 meshlink_errno = MESHLINK_EINTERNAL;
2075 pthread_mutex_unlock(&(mesh->mesh_mutex));
2081 // Create a hash of the key.
2082 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2083 sha512(fingerprint, strlen(fingerprint), hash);
2084 b64encode_urlsafe(hash, hash, 18);
2086 // Create a random cookie for this invitation.
2088 randomize(cookie, 18);
2090 // Create a filename that doesn't reveal the cookie itself
2091 char buf[18 + strlen(fingerprint)];
2092 char cookiehash[64];
2093 memcpy(buf, cookie, 18);
2094 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2095 sha512(buf, sizeof(buf), cookiehash);
2096 b64encode_urlsafe(cookiehash, cookiehash, 18);
2098 b64encode_urlsafe(cookie, cookie, 18);
2102 /* Construct the invitation file */
2103 uint8_t outbuf[4096];
2104 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2106 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2107 packmsg_add_str(&inv, name);
2108 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2109 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2111 /* TODO: Add several host config files to bootstrap connections.
2112 * Note: make sure we only add config files of nodes that are in the core mesh or the same submesh,
2113 * and are not blacklisted.
2115 config_t configs[5] = {NULL};
2118 if(config_read(mesh, mesh->self->name, &configs[count])) {
2122 /* Append host config files to the invitation file */
2123 packmsg_add_array(&inv, count);
2125 for(int i = 0; i < count; i++) {
2126 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2127 config_free(&configs[i]);
2130 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2132 if(!invitation_write(mesh, cookiehash, &config)) {
2133 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2134 meshlink_errno = MESHLINK_ESTORAGE;
2135 pthread_mutex_unlock(&(mesh->mesh_mutex));
2139 // Create an URL from the local address, key hash and cookie
2141 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2144 pthread_mutex_unlock(&(mesh->mesh_mutex));
2148 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2149 return meshlink_invite_ex(mesh, submesh, name, 0);
2152 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2153 if(!mesh || !invitation) {
2154 meshlink_errno = MESHLINK_EINVAL;
2158 pthread_mutex_lock(&(mesh->mesh_mutex));
2160 //Before doing meshlink_join make sure we are not connected to another mesh
2161 if(mesh->threadstarted) {
2162 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2163 meshlink_errno = MESHLINK_EINVAL;
2164 pthread_mutex_unlock(&(mesh->mesh_mutex));
2168 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2169 char copy[strlen(invitation) + 1];
2170 strcpy(copy, invitation);
2172 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2174 char *slash = strchr(copy, '/');
2182 if(strlen(slash) != 48) {
2186 char *address = copy;
2189 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2193 // Generate a throw-away key for the invitation.
2194 ecdsa_t *key = ecdsa_generate();
2197 meshlink_errno = MESHLINK_EINTERNAL;
2198 pthread_mutex_unlock(&(mesh->mesh_mutex));
2202 char *b64key = ecdsa_get_base64_public_key(key);
2206 while(address && *address) {
2207 // We allow commas in the address part to support multiple addresses in one invitation URL.
2208 comma = strchr(address, ',');
2214 // Split of the port
2215 port = strrchr(address, ':');
2223 // IPv6 address are enclosed in brackets, per RFC 3986
2224 if(*address == '[') {
2226 char *bracket = strchr(address, ']');
2239 // Connect to the meshlink daemon mentioned in the URL.
2240 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2243 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2244 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2246 if(mesh->sock == -1) {
2247 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2248 meshlink_errno = MESHLINK_ENETWORK;
2252 set_timeout(mesh->sock, 5000);
2254 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2255 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2256 meshlink_errno = MESHLINK_ENETWORK;
2257 closesocket(mesh->sock);
2265 meshlink_errno = MESHLINK_ERESOLV;
2268 if(mesh->sock != -1 || !comma) {
2275 if(mesh->sock == -1) {
2276 pthread_mutex_unlock(&mesh->mesh_mutex);
2280 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2282 // Tell him we have an invitation, and give him our throw-away key.
2286 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
2287 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2288 closesocket(mesh->sock);
2289 meshlink_errno = MESHLINK_ENETWORK;
2290 pthread_mutex_unlock(&(mesh->mesh_mutex));
2296 char hisname[4096] = "";
2297 int code, hismajor, hisminor = 0;
2299 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) {
2300 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2301 closesocket(mesh->sock);
2302 meshlink_errno = MESHLINK_ENETWORK;
2303 pthread_mutex_unlock(&(mesh->mesh_mutex));
2307 // Check if the hash of the key he gave us matches the hash in the URL.
2308 char *fingerprint = mesh->line + 2;
2311 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2312 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2313 meshlink_errno = MESHLINK_EINTERNAL;
2314 pthread_mutex_unlock(&(mesh->mesh_mutex));
2318 if(memcmp(hishash, mesh->hash, 18)) {
2319 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2320 meshlink_errno = MESHLINK_EPEER;
2321 pthread_mutex_unlock(&(mesh->mesh_mutex));
2326 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2329 meshlink_errno = MESHLINK_EINTERNAL;
2330 pthread_mutex_unlock(&(mesh->mesh_mutex));
2334 // Start an SPTPS session
2335 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2336 meshlink_errno = MESHLINK_EINTERNAL;
2337 pthread_mutex_unlock(&(mesh->mesh_mutex));
2341 // Feed rest of input buffer to SPTPS
2342 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2343 meshlink_errno = MESHLINK_EPEER;
2344 pthread_mutex_unlock(&(mesh->mesh_mutex));
2350 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2352 if(errno == EINTR) {
2356 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2357 meshlink_errno = MESHLINK_ENETWORK;
2358 pthread_mutex_unlock(&(mesh->mesh_mutex));
2362 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2363 meshlink_errno = MESHLINK_EPEER;
2364 pthread_mutex_unlock(&(mesh->mesh_mutex));
2369 sptps_stop(&mesh->sptps);
2372 closesocket(mesh->sock);
2374 if(!mesh->success) {
2375 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2376 meshlink_errno = MESHLINK_EPEER;
2377 pthread_mutex_unlock(&(mesh->mesh_mutex));
2381 pthread_mutex_unlock(&(mesh->mesh_mutex));
2385 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2386 meshlink_errno = MESHLINK_EINVAL;
2387 pthread_mutex_unlock(&(mesh->mesh_mutex));
2391 char *meshlink_export(meshlink_handle_t *mesh) {
2393 meshlink_errno = MESHLINK_EINVAL;
2397 // Create a config file on the fly.
2400 packmsg_output_t out = {buf, sizeof(buf)};
2401 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
2402 packmsg_add_str(&out, mesh->name);
2403 packmsg_add_str(&out, CORE_MESH);
2405 pthread_mutex_lock(&(mesh->mesh_mutex));
2407 packmsg_add_int32(&out, mesh->self->devclass);
2408 packmsg_add_bool(&out, mesh->self->status.blacklisted);
2409 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
2410 packmsg_add_str(&out, mesh->self->canonical_address ? mesh->self->canonical_address : "");
2414 for(uint32_t i = 0; i < 5; i++) {
2415 if(mesh->self->recent[i].sa.sa_family) {
2422 packmsg_add_array(&out, count);
2424 for(uint32_t i = 0; i < count; i++) {
2425 packmsg_add_sockaddr(&out, &mesh->self->recent[i]);
2428 pthread_mutex_unlock(&(mesh->mesh_mutex));
2430 if(!packmsg_output_ok(&out)) {
2431 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2432 meshlink_errno = MESHLINK_EINTERNAL;
2436 // Prepare a base64-encoded packmsg array containing our config file
2438 uint32_t len = packmsg_output_size(&out, buf);
2439 uint32_t len2 = ((len + 4) * 4) / 3 + 4;
2440 uint8_t *buf2 = xmalloc(len2);
2441 packmsg_output_t out2 = {buf2, len2};
2442 packmsg_add_array(&out2, 1);
2443 packmsg_add_bin(&out2, buf, packmsg_output_size(&out, buf));
2445 if(!packmsg_output_ok(&out2)) {
2446 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2447 meshlink_errno = MESHLINK_EINTERNAL;
2452 b64encode_urlsafe(buf2, (char *)buf2, packmsg_output_size(&out2, buf2));
2454 return (char *)buf2;
2457 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2458 if(!mesh || !data) {
2459 meshlink_errno = MESHLINK_EINVAL;
2463 size_t datalen = strlen(data);
2464 uint8_t *buf = xmalloc(datalen);
2465 int buflen = b64decode(data, buf, datalen);
2468 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2469 meshlink_errno = MESHLINK_EPEER;
2473 packmsg_input_t in = {buf, buflen};
2474 uint32_t count = packmsg_get_array(&in);
2477 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2478 meshlink_errno = MESHLINK_EPEER;
2482 pthread_mutex_lock(&(mesh->mesh_mutex));
2486 uint32_t len = packmsg_get_bin_raw(&in, &data);
2492 packmsg_input_t in2 = {data, len};
2493 uint32_t version = packmsg_get_uint32(&in2);
2494 char *name = packmsg_get_str_dup(&in2);
2496 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2498 packmsg_input_invalidate(&in);
2502 if(!check_id(name)) {
2507 node_t *n = lookup_node(mesh, name);
2510 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2518 config_t config = {data, len};
2520 if(!node_read_from_config(mesh, n, &config)) {
2522 packmsg_input_invalidate(&in);
2526 config_write(mesh, n->name, &config);
2530 pthread_mutex_unlock(&(mesh->mesh_mutex));
2532 if(!packmsg_done(&in)) {
2533 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2534 meshlink_errno = MESHLINK_EPEER;
2541 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2542 if(!mesh || !node) {
2543 meshlink_errno = MESHLINK_EINVAL;
2547 pthread_mutex_lock(&(mesh->mesh_mutex));
2552 if(n == mesh->self) {
2553 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2554 meshlink_errno = MESHLINK_EINVAL;
2555 pthread_mutex_unlock(&(mesh->mesh_mutex));
2559 if(n->status.blacklisted) {
2560 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2561 pthread_mutex_unlock(&(mesh->mesh_mutex));
2565 n->status.blacklisted = true;
2566 node_write_config(mesh, n);
2567 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2569 //Immediately terminate any connections we have with the blacklisted node
2570 for list_each(connection_t, c, mesh->connections) {
2572 terminate_connection(mesh, c, c->status.active);
2576 utcp_abort_all_connections(n->utcp);
2582 n->status.udp_confirmed = false;
2584 if(n->status.reachable) {
2585 update_node_status(mesh, n);
2588 pthread_mutex_unlock(&(mesh->mesh_mutex));
2591 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2592 if(!mesh || !node) {
2593 meshlink_errno = MESHLINK_EINVAL;
2597 pthread_mutex_lock(&(mesh->mesh_mutex));
2599 node_t *n = (node_t *)node;
2601 if(!n->status.blacklisted) {
2602 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2603 meshlink_errno = MESHLINK_EINVAL;
2604 pthread_mutex_unlock(&(mesh->mesh_mutex));
2608 n->status.blacklisted = false;
2609 node_write_config(mesh, n);
2611 pthread_mutex_unlock(&(mesh->mesh_mutex));
2615 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2616 mesh->default_blacklist = blacklist;
2619 /* Hint that a hostname may be found at an address
2620 * See header file for detailed comment.
2622 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2623 if(!mesh || !node || !addr) {
2624 meshlink_errno = EINVAL;
2628 pthread_mutex_lock(&(mesh->mesh_mutex));
2630 node_t *n = (node_t *)node;
2631 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2632 memcpy(n->recent, addr, SALEN(*addr));
2633 node_write_config(mesh, n);
2635 pthread_mutex_unlock(&(mesh->mesh_mutex));
2636 // @TODO do we want to fire off a connection attempt right away?
2639 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2641 node_t *n = utcp->priv;
2642 meshlink_handle_t *mesh = n->mesh;
2643 return mesh->channel_accept_cb;
2646 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2647 meshlink_channel_t *channel = connection->priv;
2653 node_t *n = channel->node;
2654 meshlink_handle_t *mesh = n->mesh;
2656 if(n->status.destroyed) {
2657 meshlink_channel_close(mesh, channel);
2658 } else if(channel->receive_cb) {
2659 channel->receive_cb(mesh, channel, data, len);
2665 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2666 node_t *n = utcp_connection->utcp->priv;
2672 meshlink_handle_t *mesh = n->mesh;
2674 if(!mesh->channel_accept_cb) {
2678 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2680 channel->c = utcp_connection;
2682 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2683 utcp_accept(utcp_connection, channel_recv, channel);
2689 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2690 node_t *n = utcp->priv;
2692 if(n->status.destroyed) {
2696 meshlink_handle_t *mesh = n->mesh;
2697 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2700 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2701 if(!mesh || !channel) {
2702 meshlink_errno = MESHLINK_EINVAL;
2706 channel->receive_cb = cb;
2709 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2711 node_t *n = (node_t *)source;
2717 utcp_recv(n->utcp, data, len);
2720 static void channel_poll(struct utcp_connection *connection, size_t len) {
2721 meshlink_channel_t *channel = connection->priv;
2727 node_t *n = channel->node;
2728 meshlink_handle_t *mesh = n->mesh;
2730 if(channel->poll_cb) {
2731 channel->poll_cb(mesh, channel, len);
2735 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2737 channel->poll_cb = cb;
2738 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2741 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2743 meshlink_errno = MESHLINK_EINVAL;
2747 pthread_mutex_lock(&mesh->mesh_mutex);
2748 mesh->channel_accept_cb = cb;
2749 mesh->receive_cb = channel_receive;
2751 for splay_each(node_t, n, mesh->nodes) {
2752 if(!n->utcp && n != mesh->self) {
2753 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2757 pthread_mutex_unlock(&mesh->mesh_mutex);
2760 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) {
2762 abort(); // TODO: handle non-NULL data
2765 if(!mesh || !node) {
2766 meshlink_errno = MESHLINK_EINVAL;
2770 node_t *n = (node_t *)node;
2773 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2774 mesh->receive_cb = channel_receive;
2777 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2782 if(n->status.blacklisted) {
2783 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
2787 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2789 channel->receive_cb = cb;
2790 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2793 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2801 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) {
2802 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2805 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2806 if(!mesh || !channel) {
2807 meshlink_errno = MESHLINK_EINVAL;
2811 utcp_shutdown(channel->c, direction);
2814 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2815 if(!mesh || !channel) {
2816 meshlink_errno = MESHLINK_EINVAL;
2820 utcp_close(channel->c);
2824 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2825 if(!mesh || !channel) {
2826 meshlink_errno = MESHLINK_EINVAL;
2835 meshlink_errno = MESHLINK_EINVAL;
2839 // TODO: more finegrained locking.
2840 // Ideally we want to put the data into the UTCP connection's send buffer.
2841 // Then, preferably only if there is room in the receiver window,
2842 // kick the meshlink thread to go send packets.
2844 pthread_mutex_lock(&mesh->mesh_mutex);
2845 ssize_t retval = utcp_send(channel->c, data, len);
2846 pthread_mutex_unlock(&mesh->mesh_mutex);
2849 meshlink_errno = MESHLINK_ENETWORK;
2855 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2856 if(!mesh || !channel) {
2857 meshlink_errno = MESHLINK_EINVAL;
2861 return channel->c->flags;
2864 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2865 if(!mesh || !channel) {
2866 meshlink_errno = MESHLINK_EINVAL;
2870 return utcp_get_sendq(channel->c);
2873 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2874 if(!mesh || !channel) {
2875 meshlink_errno = MESHLINK_EINVAL;
2879 return utcp_get_recvq(channel->c);
2882 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2883 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2884 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2887 if(mesh->node_status_cb) {
2888 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
2892 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
2893 if(!mesh->node_duplicate_cb || n->status.duplicate) {
2897 n->status.duplicate = true;
2898 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
2901 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2905 meshlink_errno = MESHLINK_EINVAL;
2909 pthread_mutex_lock(&mesh->mesh_mutex);
2911 if(mesh->discovery == enable) {
2915 if(mesh->threadstarted) {
2917 discovery_start(mesh);
2919 discovery_stop(mesh);
2923 mesh->discovery = enable;
2926 pthread_mutex_unlock(&mesh->mesh_mutex);
2930 meshlink_errno = MESHLINK_ENOTSUP;
2934 static void __attribute__((constructor)) meshlink_init(void) {
2937 randomize(&seed, sizeof(seed));
2941 static void __attribute__((destructor)) meshlink_exit(void) {
2945 /// Device class traits
2946 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2947 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2948 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2949 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2950 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN