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 finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
534 packmsg_input_t in = {buf, len};
535 uint32_t version = packmsg_get_uint32(&in);
537 if(version != MESHLINK_INVITATION_VERSION) {
538 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
542 char *name = packmsg_get_str_dup(&in);
543 packmsg_skip_element(&in); /* submesh */
544 int32_t devclass = packmsg_get_int32(&in);
545 uint32_t count = packmsg_get_array(&in);
548 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
552 if(!check_id(name)) {
553 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
558 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
562 // Initialize configuration directory
563 if(!config_init(mesh)) {
567 // Write main config file
568 uint8_t outbuf[4096];
569 packmsg_output_t out = {outbuf, sizeof(outbuf)};
570 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
571 packmsg_add_str(&out, name);
572 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
573 packmsg_add_uint16(&out, atoi(mesh->myport));
575 config_t config = {outbuf, packmsg_output_size(&out, outbuf)};
577 if(!main_config_write(mesh, &config)) {
581 // Write our own host config file
583 out.len = sizeof(outbuf);
584 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
585 packmsg_add_str(&out, name);
586 packmsg_add_str(&out, CORE_MESH);
587 packmsg_add_int32(&out, devclass);
588 packmsg_add_bool(&out, false);
589 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
590 packmsg_add_str(&out, ""); // TODO: copy existing canonical address, in case it was added before meshlink_join().
591 packmsg_add_array(&out, 0);
593 config.len = packmsg_output_size(&out, outbuf);
595 if(!config_write(mesh, name, &config)) {
599 // Write host config files
602 uint32_t len = packmsg_get_bin_raw(&in, &data);
605 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
609 packmsg_input_t in2 = {data, len};
610 uint32_t version = packmsg_get_uint32(&in2);
612 if(version != MESHLINK_CONFIG_VERSION) {
613 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
617 char *host = packmsg_get_str_dup(&in2);
619 if(!check_id(host)) {
620 logger(mesh, MESHLINK_ERROR, "Invalid node name in invitation file!\n");
625 if(!strcmp(host, name)) {
626 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
631 config_t config = {data, len};
632 config_write(mesh, host, &config);
634 node_t *n = new_node();
636 node_read_full(mesh, n);
637 n->devclass = mesh->devclass;
641 sptps_send_record(&(mesh->sptps), 1, ecdsa_get_public_key(mesh->private_key), 32);
644 free(mesh->self->name);
645 mesh->name = xstrdup(name);
646 mesh->self->name = xstrdup(name);
648 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
650 load_all_nodes(mesh);
655 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
657 meshlink_handle_t *mesh = handle;
658 const char *ptr = data;
661 int result = send(mesh->sock, ptr, len, 0);
663 if(result == -1 && errno == EINTR) {
665 } else if(result <= 0) {
676 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
677 meshlink_handle_t *mesh = handle;
680 case SPTPS_HANDSHAKE:
681 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
684 return finalize_join(mesh, msg, len);
687 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
688 shutdown(mesh->sock, SHUT_RDWR);
689 mesh->success = true;
699 static bool recvline(meshlink_handle_t *mesh, size_t len) {
700 char *newline = NULL;
706 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
707 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
709 if(result == -1 && errno == EINTR) {
711 } else if(result <= 0) {
715 mesh->blen += result;
718 if((size_t)(newline - mesh->buffer) >= len) {
722 len = newline - mesh->buffer;
724 memcpy(mesh->line, mesh->buffer, len);
726 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
727 mesh->blen -= len + 1;
731 static bool sendline(int fd, char *format, ...) {
732 static char buffer[4096];
737 va_start(ap, format);
738 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
741 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
749 int result = send(fd, p, blen, MSG_NOSIGNAL);
751 if(result == -1 && errno == EINTR) {
753 } else if(result <= 0) {
764 static const char *errstr[] = {
765 [MESHLINK_OK] = "No error",
766 [MESHLINK_EINVAL] = "Invalid argument",
767 [MESHLINK_ENOMEM] = "Out of memory",
768 [MESHLINK_ENOENT] = "No such node",
769 [MESHLINK_EEXIST] = "Node already exists",
770 [MESHLINK_EINTERNAL] = "Internal error",
771 [MESHLINK_ERESOLV] = "Could not resolve hostname",
772 [MESHLINK_ESTORAGE] = "Storage error",
773 [MESHLINK_ENETWORK] = "Network error",
774 [MESHLINK_EPEER] = "Error communicating with peer",
775 [MESHLINK_ENOTSUP] = "Operation not supported",
776 [MESHLINK_EBUSY] = "MeshLink instance already in use",
779 const char *meshlink_strerror(meshlink_errno_t err) {
780 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
781 return "Invalid error code";
787 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
788 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
790 mesh->private_key = ecdsa_generate();
791 mesh->invitation_key = ecdsa_generate();
793 if(!mesh->private_key || !mesh->invitation_key) {
794 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
795 meshlink_errno = MESHLINK_EINTERNAL;
799 logger(mesh, MESHLINK_DEBUG, "Done.\n");
804 static struct timeval idle(event_loop_t *loop, void *data) {
806 meshlink_handle_t *mesh = data;
807 struct timeval t, tmin = {3600, 0};
809 for splay_each(node_t, n, mesh->nodes) {
814 t = utcp_timeout(n->utcp);
816 if(timercmp(&t, &tmin, <)) {
824 // Get our local address(es) by simulating connecting to an Internet host.
825 static void add_local_addresses(meshlink_handle_t *mesh) {
826 struct sockaddr_storage sn;
827 socklen_t sl = sizeof(sn);
831 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
832 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
833 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
840 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
841 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
842 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
847 static bool meshlink_write_config(meshlink_handle_t *mesh) {
849 packmsg_output_t out = {buf, sizeof buf};
850 packmsg_add_str(&out, mesh->name);
851 packmsg_add_uint32(&out, mesh->devclass);
852 packmsg_add_uint16(&out, mesh->port);
853 packmsg_add_bin(&out, ecdsa, sizeof(ecdsa));
854 uint32_t len = packmsg_output_size(&out, buf);
857 logger(mesh, MESHLINK_DEBUG, "Could not create configuration data\n",);
858 meshlink_errno = MESHLINK_EINTERNAL;
864 static bool meshlink_setup(meshlink_handle_t *mesh) {
865 if(!config_init(mesh)) {
866 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s: %s\n", mesh->confbase, strerror(errno));
867 meshlink_errno = MESHLINK_ESTORAGE;
871 if(!ecdsa_keygen(mesh)) {
872 meshlink_errno = MESHLINK_EINTERNAL;
876 if(check_port(mesh) == 0) {
877 meshlink_errno = MESHLINK_ENETWORK;
881 /* Create a node for ourself */
883 mesh->self = new_node();
884 mesh->self->name = xstrdup(mesh->name);
885 mesh->self->devclass = mesh->devclass;
886 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
888 // Write the main config file
890 packmsg_output_t out = {buf, sizeof(buf)};
892 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
893 packmsg_add_str(&out, mesh->name);
894 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
895 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
896 packmsg_add_uint16(&out, atoi(mesh->myport));
898 config_t config = {buf, packmsg_output_size(&out, buf)};
900 if(!main_config_write(mesh, &config)) {
904 // Write our own host config file
906 out.len = sizeof(buf);
907 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
908 packmsg_add_str(&out, mesh->name);
909 packmsg_add_int32(&out, mesh->devclass);
910 packmsg_add_bool(&out, false);
911 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
912 packmsg_add_str(&out, ""); // TODO: copy existing canonical address, in case it was added before meshlink_join().
913 packmsg_add_array(&out, 0);
915 config.len = packmsg_output_size(&out, buf);
917 if(!config_write(mesh, mesh->name, &config)) {
924 static bool meshlink_read_config(meshlink_handle_t *mesh) {
925 // Open the configuration file and lock it
926 if(!main_config_lock(mesh)) {
927 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
928 meshlink_errno = MESHLINK_ESTORAGE;
934 if(!main_config_read(mesh, &config)) {
935 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
939 packmsg_input_t in = {config.buf, config.len};
940 const void *private_key;
941 const void *invitation_key;
943 uint32_t version = packmsg_get_uint32(&in);
944 char *name = packmsg_get_str_dup(&in);
945 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
946 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
947 uint16_t myport = packmsg_get_uint16(&in);
949 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
950 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
952 config_free(&config);
959 if(mesh->name && strcmp(mesh->name, name)) {
960 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
961 meshlink_errno = MESHLINK_ESTORAGE;
963 config_free(&config);
971 xasprintf(&mesh->myport, "%u", myport);
972 mesh->private_key = ecdsa_set_private_key(private_key);
973 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
974 config_free(&config);
976 /* Create a node for ourself and read our host configuration file */
978 mesh->self = new_node();
979 mesh->self->name = xstrdup(name);
980 mesh->self->devclass = mesh->devclass;
982 if(!node_read_public_key(mesh, mesh->self)) {
983 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
984 free_node(mesh->self);
993 static void *setup_network_in_netns_thread(void *arg) {
994 meshlink_handle_t *mesh = arg;
996 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1000 bool success = setup_network(mesh);
1001 add_local_addresses(mesh);
1002 return success ? arg : NULL;
1004 #endif // HAVE_SETNS
1006 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1007 if(!confbase || !*confbase) {
1008 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1009 meshlink_errno = MESHLINK_EINVAL;
1013 if(!appname || !*appname) {
1014 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1015 meshlink_errno = MESHLINK_EINVAL;
1019 if(strchr(appname, ' ')) {
1020 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1021 meshlink_errno = MESHLINK_EINVAL;
1025 if(!name || !*name) {
1026 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1028 } else { //check name only if there is a name != NULL
1029 if(!check_id(name)) {
1030 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1031 meshlink_errno = MESHLINK_EINVAL;
1036 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1037 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1038 meshlink_errno = MESHLINK_EINVAL;
1042 meshlink_open_params_t *params = xzalloc(sizeof * params);
1044 params->confbase = xstrdup(confbase);
1045 params->name = xstrdup(name);
1046 params->appname = xstrdup(appname);
1047 params->devclass = devclass;
1053 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1055 meshlink_errno = MESHLINK_EINVAL;
1059 params->netns = netns;
1064 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1066 meshlink_errno = MESHLINK_EINVAL;
1070 if((!key && keylen) || (key && !keylen)) {
1071 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1072 meshlink_errno = MESHLINK_EINVAL;
1077 params->keylen = keylen;
1082 void meshlink_open_params_free(meshlink_open_params_t *params) {
1084 meshlink_errno = MESHLINK_EINVAL;
1088 free(params->confbase);
1090 free(params->appname);
1095 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1096 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1097 meshlink_open_params_t params;
1098 memset(¶ms, 0, sizeof(params));
1100 params.confbase = (char *)confbase;
1101 params.name = (char *)name;
1102 params.appname = (char *)appname;
1103 params.devclass = devclass;
1106 return meshlink_open_ex(¶ms);
1109 meshlink_handle_t *meshlink_open_encrypted(const char *confbase, const char *name, const char *appname, dev_class_t devclass, const void *key, size_t keylen) {
1110 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1111 meshlink_open_params_t params = {NULL};
1113 params.confbase = (char *)confbase;
1114 params.name = (char *)name;
1115 params.appname = (char *)appname;
1116 params.devclass = devclass;
1119 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1123 return meshlink_open_ex(¶ms);
1126 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1127 // Validate arguments provided by the application
1128 bool usingname = false;
1130 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1132 if(!params->confbase || !*params->confbase) {
1133 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1134 meshlink_errno = MESHLINK_EINVAL;
1138 if(!params->appname || !*params->appname) {
1139 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1140 meshlink_errno = MESHLINK_EINVAL;
1144 if(strchr(params->appname, ' ')) {
1145 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1146 meshlink_errno = MESHLINK_EINVAL;
1150 if(!params->name || !*params->name) {
1151 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1153 } else { //check name only if there is a name != NULL
1155 if(!check_id(params->name)) {
1156 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1157 meshlink_errno = MESHLINK_EINVAL;
1164 if((int)params->devclass < 0 || params->devclass > _DEV_CLASS_MAX) {
1165 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1166 meshlink_errno = MESHLINK_EINVAL;
1170 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1171 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1172 meshlink_errno = MESHLINK_EINVAL;
1176 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1177 mesh->confbase = xstrdup(params->confbase);
1178 mesh->appname = xstrdup(params->appname);
1179 mesh->devclass = params->devclass;
1180 mesh->discovery = true;
1181 mesh->invitation_timeout = 604800; // 1 week
1182 mesh->netns = params->netns;
1183 mesh->submeshes = NULL;
1186 mesh->name = xstrdup(params->name);
1191 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1193 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1194 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1195 meshlink_errno = MESHLINK_EINTERNAL;
1201 pthread_mutexattr_t attr;
1202 pthread_mutexattr_init(&attr);
1203 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1204 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1206 mesh->threadstarted = false;
1207 event_loop_init(&mesh->loop);
1208 mesh->loop.data = mesh;
1210 meshlink_queue_init(&mesh->outpacketqueue);
1212 // If no configuration exists yet, create it.
1214 if(!main_config_exists(mesh)) {
1215 if(!meshlink_setup(mesh)) {
1216 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1217 meshlink_close(mesh);
1221 if(!meshlink_read_config(mesh)) {
1222 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1223 meshlink_close(mesh);
1229 struct WSAData wsa_state;
1230 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1233 // Setup up everything
1234 // TODO: we should not open listening sockets yet
1236 bool success = false;
1238 if(mesh->netns != -1) {
1242 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1243 void *retval = NULL;
1244 success = pthread_join(thr, &retval) == 0 && retval;
1248 meshlink_errno = MESHLINK_EINTERNAL;
1251 #endif // HAVE_SETNS
1253 success = setup_network(mesh);
1254 add_local_addresses(mesh);
1258 meshlink_close(mesh);
1259 meshlink_errno = MESHLINK_ENETWORK;
1263 add_local_addresses(mesh);
1264 node_write_config(mesh, mesh->self);
1266 idle_set(&mesh->loop, idle, mesh);
1268 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1272 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1273 meshlink_submesh_t *s = NULL;
1276 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1277 meshlink_errno = MESHLINK_EINVAL;
1281 if(!submesh || !*submesh) {
1282 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1283 meshlink_errno = MESHLINK_EINVAL;
1288 pthread_mutex_lock(&(mesh->mesh_mutex));
1290 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1292 pthread_mutex_unlock(&(mesh->mesh_mutex));
1297 static void *meshlink_main_loop(void *arg) {
1298 meshlink_handle_t *mesh = arg;
1300 if(mesh->netns != -1) {
1303 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1309 #endif // HAVE_SETNS
1312 pthread_mutex_lock(&(mesh->mesh_mutex));
1314 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1316 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1318 pthread_mutex_unlock(&(mesh->mesh_mutex));
1322 bool meshlink_start(meshlink_handle_t *mesh) {
1324 assert(mesh->private_key);
1327 meshlink_errno = MESHLINK_EINVAL;
1331 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1333 pthread_mutex_lock(&(mesh->mesh_mutex));
1335 if(mesh->threadstarted) {
1336 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1337 pthread_mutex_unlock(&(mesh->mesh_mutex));
1341 if(mesh->listen_socket[0].tcp.fd < 0) {
1342 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1343 meshlink_errno = MESHLINK_ENETWORK;
1347 mesh->thedatalen = 0;
1349 // TODO: open listening sockets first
1351 //Check that a valid name is set
1353 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1354 meshlink_errno = MESHLINK_EINVAL;
1355 pthread_mutex_unlock(&(mesh->mesh_mutex));
1359 init_outgoings(mesh);
1361 // Start the main thread
1363 event_loop_start(&mesh->loop);
1365 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1366 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1367 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1368 meshlink_errno = MESHLINK_EINTERNAL;
1369 event_loop_stop(&mesh->loop);
1370 pthread_mutex_unlock(&(mesh->mesh_mutex));
1374 mesh->threadstarted = true;
1378 if(mesh->discovery) {
1379 discovery_start(mesh);
1384 assert(mesh->self->ecdsa);
1385 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1388 pthread_mutex_unlock(&(mesh->mesh_mutex));
1392 void meshlink_stop(meshlink_handle_t *mesh) {
1394 meshlink_errno = MESHLINK_EINVAL;
1398 pthread_mutex_lock(&(mesh->mesh_mutex));
1399 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1404 if(mesh->discovery) {
1405 discovery_stop(mesh);
1410 // Shut down the main thread
1411 event_loop_stop(&mesh->loop);
1413 // Send ourselves a UDP packet to kick the event loop
1414 for(int i = 0; i < mesh->listen_sockets; i++) {
1416 socklen_t salen = sizeof(sa.sa);
1418 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1419 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1423 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1424 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1428 if(mesh->threadstarted) {
1429 // Wait for the main thread to finish
1430 pthread_mutex_unlock(&(mesh->mesh_mutex));
1431 pthread_join(mesh->thread, NULL);
1432 pthread_mutex_lock(&(mesh->mesh_mutex));
1434 mesh->threadstarted = false;
1437 // Close all metaconnections
1438 if(mesh->connections) {
1439 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1441 connection_t *c = node->data;
1443 terminate_connection(mesh, c, false);
1447 exit_outgoings(mesh);
1449 pthread_mutex_unlock(&(mesh->mesh_mutex));
1452 void meshlink_close(meshlink_handle_t *mesh) {
1453 if(!mesh || !mesh->confbase) {
1454 meshlink_errno = MESHLINK_EINVAL;
1458 // stop can be called even if mesh has not been started
1459 meshlink_stop(mesh);
1461 // lock is not released after this
1462 pthread_mutex_lock(&(mesh->mesh_mutex));
1464 // Close and free all resources used.
1466 close_network_connections(mesh);
1468 logger(mesh, MESHLINK_INFO, "Terminating");
1470 event_loop_exit(&mesh->loop);
1474 if(mesh->confbase) {
1480 ecdsa_free(mesh->invitation_key);
1482 if(mesh->netns != -1) {
1487 free(mesh->appname);
1488 free(mesh->confbase);
1489 pthread_mutex_destroy(&(mesh->mesh_mutex));
1491 main_config_unlock(mesh);
1493 memset(mesh, 0, sizeof(*mesh));
1498 bool meshlink_destroy(const char *confbase) {
1500 meshlink_errno = MESHLINK_EINVAL;
1504 return config_destroy(confbase);
1507 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1509 meshlink_errno = MESHLINK_EINVAL;
1513 pthread_mutex_lock(&(mesh->mesh_mutex));
1514 mesh->receive_cb = cb;
1515 pthread_mutex_unlock(&(mesh->mesh_mutex));
1518 void meshlink_set_connection_try_cb(meshlink_handle_t *mesh, meshlink_connection_try_cb_t cb) {
1520 meshlink_errno = MESHLINK_EINVAL;
1524 pthread_mutex_lock(&(mesh->mesh_mutex));
1525 mesh->connection_try_cb = cb;
1526 pthread_mutex_unlock(&(mesh->mesh_mutex));
1529 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1531 meshlink_errno = MESHLINK_EINVAL;
1535 pthread_mutex_lock(&(mesh->mesh_mutex));
1536 mesh->node_status_cb = cb;
1537 pthread_mutex_unlock(&(mesh->mesh_mutex));
1540 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1542 meshlink_errno = MESHLINK_EINVAL;
1546 pthread_mutex_lock(&(mesh->mesh_mutex));
1547 mesh->node_duplicate_cb = cb;
1548 pthread_mutex_unlock(&(mesh->mesh_mutex));
1551 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1553 pthread_mutex_lock(&(mesh->mesh_mutex));
1555 mesh->log_level = cb ? level : 0;
1556 pthread_mutex_unlock(&(mesh->mesh_mutex));
1559 global_log_level = cb ? level : 0;
1563 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1564 meshlink_packethdr_t *hdr;
1566 // Validate arguments
1567 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1568 meshlink_errno = MESHLINK_EINVAL;
1577 meshlink_errno = MESHLINK_EINVAL;
1581 node_t *n = (node_t *)destination;
1583 if(n->status.blacklisted) {
1584 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1588 // Prepare the packet
1589 vpn_packet_t *packet = malloc(sizeof(*packet));
1592 meshlink_errno = MESHLINK_ENOMEM;
1596 packet->probe = false;
1597 packet->tcp = false;
1598 packet->len = len + sizeof(*hdr);
1600 hdr = (meshlink_packethdr_t *)packet->data;
1601 memset(hdr, 0, sizeof(*hdr));
1602 // leave the last byte as 0 to make sure strings are always
1603 // null-terminated if they are longer than the buffer
1604 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1605 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1607 memcpy(packet->data + sizeof(*hdr), data, len);
1610 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1612 meshlink_errno = MESHLINK_ENOMEM;
1616 // Notify event loop
1617 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1622 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1624 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1630 mesh->self->in_packets++;
1631 mesh->self->in_bytes += packet->len;
1632 route(mesh, mesh->self, packet);
1635 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1636 if(!mesh || !destination) {
1637 meshlink_errno = MESHLINK_EINVAL;
1641 pthread_mutex_lock(&(mesh->mesh_mutex));
1643 node_t *n = (node_t *)destination;
1645 if(!n->status.reachable) {
1646 pthread_mutex_unlock(&(mesh->mesh_mutex));
1649 } else if(n->mtuprobes > 30 && n->minmtu) {
1650 pthread_mutex_unlock(&(mesh->mesh_mutex));
1653 pthread_mutex_unlock(&(mesh->mesh_mutex));
1658 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1659 if(!mesh || !node) {
1660 meshlink_errno = MESHLINK_EINVAL;
1664 pthread_mutex_lock(&(mesh->mesh_mutex));
1666 node_t *n = (node_t *)node;
1668 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1669 meshlink_errno = MESHLINK_EINTERNAL;
1670 pthread_mutex_unlock(&(mesh->mesh_mutex));
1674 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1677 meshlink_errno = MESHLINK_EINTERNAL;
1680 pthread_mutex_unlock(&(mesh->mesh_mutex));
1684 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1686 meshlink_errno = MESHLINK_EINVAL;
1690 return (meshlink_node_t *)mesh->self;
1693 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1694 if(!mesh || !name) {
1695 meshlink_errno = MESHLINK_EINVAL;
1699 meshlink_node_t *node = NULL;
1701 pthread_mutex_lock(&(mesh->mesh_mutex));
1702 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1703 pthread_mutex_unlock(&(mesh->mesh_mutex));
1707 meshlink_submesh_t *meshlink_get_submesh(meshlink_handle_t *mesh, const char *name) {
1708 if(!mesh || !name) {
1709 meshlink_errno = MESHLINK_EINVAL;
1713 meshlink_submesh_t *submesh = NULL;
1715 pthread_mutex_lock(&(mesh->mesh_mutex));
1716 submesh = (meshlink_submesh_t *)lookup_submesh(mesh, name);
1717 pthread_mutex_unlock(&(mesh->mesh_mutex));
1721 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1722 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1723 meshlink_errno = MESHLINK_EINVAL;
1727 meshlink_node_t **result;
1730 pthread_mutex_lock(&(mesh->mesh_mutex));
1732 *nmemb = mesh->nodes->count;
1733 result = realloc(nodes, *nmemb * sizeof(*nodes));
1736 meshlink_node_t **p = result;
1738 for splay_each(node_t, n, mesh->nodes) {
1739 *p++ = (meshlink_node_t *)n;
1744 meshlink_errno = MESHLINK_ENOMEM;
1747 pthread_mutex_unlock(&(mesh->mesh_mutex));
1752 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) {
1753 meshlink_node_t **result;
1755 pthread_mutex_lock(&(mesh->mesh_mutex));
1759 for splay_each(node_t, n, mesh->nodes) {
1760 if(true == search_node(n, condition)) {
1761 *nmemb = *nmemb + 1;
1767 pthread_mutex_unlock(&(mesh->mesh_mutex));
1771 result = realloc(nodes, *nmemb * sizeof(*nodes));
1774 meshlink_node_t **p = result;
1776 for splay_each(node_t, n, mesh->nodes) {
1777 if(true == search_node(n, condition)) {
1778 *p++ = (meshlink_node_t *)n;
1784 meshlink_errno = MESHLINK_ENOMEM;
1787 pthread_mutex_unlock(&(mesh->mesh_mutex));
1792 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1793 dev_class_t *devclass = (dev_class_t *)condition;
1795 if(*devclass == node->devclass) {
1802 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1803 if(condition == node->submesh) {
1810 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) {
1811 if(!mesh || ((int)devclass < 0) || (devclass > _DEV_CLASS_MAX) || !nmemb) {
1812 meshlink_errno = MESHLINK_EINVAL;
1816 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
1819 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
1820 if(!mesh || !submesh || !nmemb) {
1821 meshlink_errno = MESHLINK_EINVAL;
1825 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
1828 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
1829 if(!mesh || !node) {
1830 meshlink_errno = MESHLINK_EINVAL;
1834 dev_class_t devclass;
1836 pthread_mutex_lock(&(mesh->mesh_mutex));
1838 devclass = ((node_t *)node)->devclass;
1840 pthread_mutex_unlock(&(mesh->mesh_mutex));
1845 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
1846 if(!mesh || !node) {
1847 meshlink_errno = MESHLINK_EINVAL;
1851 node_t *n = (node_t *)node;
1853 meshlink_submesh_t *s;
1855 s = (meshlink_submesh_t *)n->submesh;
1860 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1861 if(!mesh || !data || !len || !signature || !siglen) {
1862 meshlink_errno = MESHLINK_EINVAL;
1866 if(*siglen < MESHLINK_SIGLEN) {
1867 meshlink_errno = MESHLINK_EINVAL;
1871 pthread_mutex_lock(&(mesh->mesh_mutex));
1873 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
1874 meshlink_errno = MESHLINK_EINTERNAL;
1875 pthread_mutex_unlock(&(mesh->mesh_mutex));
1879 *siglen = MESHLINK_SIGLEN;
1880 pthread_mutex_unlock(&(mesh->mesh_mutex));
1884 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1885 if(!mesh || !data || !len || !signature) {
1886 meshlink_errno = MESHLINK_EINVAL;
1890 if(siglen != MESHLINK_SIGLEN) {
1891 meshlink_errno = MESHLINK_EINVAL;
1895 pthread_mutex_lock(&(mesh->mesh_mutex));
1899 struct node_t *n = (struct node_t *)source;
1901 if(!node_read_public_key(mesh, n)) {
1902 meshlink_errno = MESHLINK_EINTERNAL;
1905 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1908 pthread_mutex_unlock(&(mesh->mesh_mutex));
1912 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1913 pthread_mutex_lock(&(mesh->mesh_mutex));
1915 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
1918 // TODO: Update invitation key if necessary?
1921 pthread_mutex_unlock(&(mesh->mesh_mutex));
1923 return mesh->invitation_key;
1926 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1927 if(!mesh || !node || !address) {
1928 meshlink_errno = MESHLINK_EINVAL;
1932 if(!is_valid_hostname(address)) {
1933 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1934 meshlink_errno = MESHLINK_EINVAL;
1938 if(port && !is_valid_port(port)) {
1939 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1940 meshlink_errno = MESHLINK_EINVAL;
1944 char *canonical_address;
1947 xasprintf(&canonical_address, "%s %s", address, port);
1949 canonical_address = xstrdup(address);
1952 pthread_mutex_lock(&(mesh->mesh_mutex));
1954 node_t *n = (node_t *)node;
1955 free(n->canonical_address);
1956 n->canonical_address = canonical_address;
1957 n->status.dirty = true;
1959 pthread_mutex_unlock(&(mesh->mesh_mutex));
1964 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1965 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
1968 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1970 meshlink_errno = MESHLINK_EINVAL;
1974 char *address = meshlink_get_external_address(mesh);
1980 bool rval = meshlink_add_address(mesh, address);
1986 int meshlink_get_port(meshlink_handle_t *mesh) {
1988 meshlink_errno = MESHLINK_EINVAL;
1993 meshlink_errno = MESHLINK_EINTERNAL;
1997 return atoi(mesh->myport);
2000 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
2001 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
2002 meshlink_errno = MESHLINK_EINVAL;
2006 if(mesh->myport && port == atoi(mesh->myport)) {
2010 if(!try_bind(port)) {
2011 meshlink_errno = MESHLINK_ENETWORK;
2015 devtool_trybind_probe();
2019 pthread_mutex_lock(&(mesh->mesh_mutex));
2021 if(mesh->threadstarted) {
2022 meshlink_errno = MESHLINK_EINVAL;
2026 close_network_connections(mesh);
2028 // TODO: write meshlink.conf again
2030 if(!setup_network(mesh)) {
2031 meshlink_errno = MESHLINK_ENETWORK;
2037 pthread_mutex_unlock(&(mesh->mesh_mutex));
2039 return rval && meshlink_get_port(mesh) == port;
2042 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2043 mesh->invitation_timeout = timeout;
2046 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
2047 meshlink_submesh_t *s = NULL;
2050 meshlink_errno = MESHLINK_EINVAL;
2055 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2058 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2059 meshlink_errno = MESHLINK_EINVAL;
2063 s = (meshlink_submesh_t *)mesh->self->submesh;
2066 pthread_mutex_lock(&(mesh->mesh_mutex));
2068 // Check validity of the new node's name
2069 if(!check_id(name)) {
2070 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2071 meshlink_errno = MESHLINK_EINVAL;
2072 pthread_mutex_unlock(&(mesh->mesh_mutex));
2076 // Ensure no host configuration file with that name exists
2077 if(config_exists(mesh, name)) {
2078 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2079 meshlink_errno = MESHLINK_EEXIST;
2080 pthread_mutex_unlock(&(mesh->mesh_mutex));
2084 // Ensure no other nodes know about this name
2085 if(meshlink_get_node(mesh, name)) {
2086 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2087 meshlink_errno = MESHLINK_EEXIST;
2088 pthread_mutex_unlock(&(mesh->mesh_mutex));
2092 // Get the local address
2093 char *address = get_my_hostname(mesh, flags);
2096 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2097 meshlink_errno = MESHLINK_ERESOLV;
2098 pthread_mutex_unlock(&(mesh->mesh_mutex));
2102 if(!refresh_invitation_key(mesh)) {
2103 meshlink_errno = MESHLINK_EINTERNAL;
2104 pthread_mutex_unlock(&(mesh->mesh_mutex));
2110 // Create a hash of the key.
2111 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2112 sha512(fingerprint, strlen(fingerprint), hash);
2113 b64encode_urlsafe(hash, hash, 18);
2115 // Create a random cookie for this invitation.
2117 randomize(cookie, 18);
2119 // Create a filename that doesn't reveal the cookie itself
2120 char buf[18 + strlen(fingerprint)];
2121 char cookiehash[64];
2122 memcpy(buf, cookie, 18);
2123 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2124 sha512(buf, sizeof(buf), cookiehash);
2125 b64encode_urlsafe(cookiehash, cookiehash, 18);
2127 b64encode_urlsafe(cookie, cookie, 18);
2131 /* Construct the invitation file */
2132 uint8_t outbuf[4096];
2133 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2135 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2136 packmsg_add_str(&inv, name);
2137 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2138 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2140 /* TODO: Add several host config files to bootstrap connections */
2141 config_t configs[5] = {NULL};
2144 if(config_read(mesh, mesh->self->name, &configs[count])) {
2148 /* Append host config files to the invitation file */
2149 packmsg_add_array(&inv, count);
2151 for(int i = 0; i < count; i++) {
2152 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2153 config_free(&configs[i]);
2156 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2158 if(!invitation_write(mesh, cookiehash, &config)) {
2159 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2160 meshlink_errno = MESHLINK_ESTORAGE;
2161 pthread_mutex_unlock(&(mesh->mesh_mutex));
2165 // Create an URL from the local address, key hash and cookie
2167 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2170 pthread_mutex_unlock(&(mesh->mesh_mutex));
2174 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2175 return meshlink_invite_ex(mesh, submesh, name, 0);
2178 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2179 if(!mesh || !invitation) {
2180 meshlink_errno = MESHLINK_EINVAL;
2184 pthread_mutex_lock(&(mesh->mesh_mutex));
2186 //Before doing meshlink_join make sure we are not connected to another mesh
2187 if(mesh->threadstarted) {
2188 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2189 meshlink_errno = MESHLINK_EINVAL;
2190 pthread_mutex_unlock(&(mesh->mesh_mutex));
2194 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2195 char copy[strlen(invitation) + 1];
2196 strcpy(copy, invitation);
2198 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2200 char *slash = strchr(copy, '/');
2208 if(strlen(slash) != 48) {
2212 char *address = copy;
2215 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2219 // Generate a throw-away key for the invitation.
2220 ecdsa_t *key = ecdsa_generate();
2223 meshlink_errno = MESHLINK_EINTERNAL;
2224 pthread_mutex_unlock(&(mesh->mesh_mutex));
2228 char *b64key = ecdsa_get_base64_public_key(key);
2232 while(address && *address) {
2233 // We allow commas in the address part to support multiple addresses in one invitation URL.
2234 comma = strchr(address, ',');
2240 // Split of the port
2241 port = strrchr(address, ':');
2249 // IPv6 address are enclosed in brackets, per RFC 3986
2250 if(*address == '[') {
2252 char *bracket = strchr(address, ']');
2265 // Connect to the meshlink daemon mentioned in the URL.
2266 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2269 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2270 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2272 if(mesh->sock == -1) {
2273 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2274 meshlink_errno = MESHLINK_ENETWORK;
2278 set_timeout(mesh->sock, 5000);
2280 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2281 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2282 meshlink_errno = MESHLINK_ENETWORK;
2283 closesocket(mesh->sock);
2291 meshlink_errno = MESHLINK_ERESOLV;
2294 if(mesh->sock != -1 || !comma) {
2301 if(mesh->sock == -1) {
2302 pthread_mutex_unlock(&mesh->mesh_mutex);
2306 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2308 // Tell him we have an invitation, and give him our throw-away key.
2312 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, 1, mesh->appname)) {
2313 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2314 closesocket(mesh->sock);
2315 meshlink_errno = MESHLINK_ENETWORK;
2316 pthread_mutex_unlock(&(mesh->mesh_mutex));
2322 char hisname[4096] = "";
2323 int code, hismajor, hisminor = 0;
2325 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) {
2326 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2327 closesocket(mesh->sock);
2328 meshlink_errno = MESHLINK_ENETWORK;
2329 pthread_mutex_unlock(&(mesh->mesh_mutex));
2333 // Check if the hash of the key he gave us matches the hash in the URL.
2334 char *fingerprint = mesh->line + 2;
2337 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2338 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2339 meshlink_errno = MESHLINK_EINTERNAL;
2340 pthread_mutex_unlock(&(mesh->mesh_mutex));
2344 if(memcmp(hishash, mesh->hash, 18)) {
2345 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2346 meshlink_errno = MESHLINK_EPEER;
2347 pthread_mutex_unlock(&(mesh->mesh_mutex));
2352 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2355 meshlink_errno = MESHLINK_EINTERNAL;
2356 pthread_mutex_unlock(&(mesh->mesh_mutex));
2360 // Start an SPTPS session
2361 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2362 meshlink_errno = MESHLINK_EINTERNAL;
2363 pthread_mutex_unlock(&(mesh->mesh_mutex));
2367 // Feed rest of input buffer to SPTPS
2368 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2369 meshlink_errno = MESHLINK_EPEER;
2370 pthread_mutex_unlock(&(mesh->mesh_mutex));
2376 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2378 if(errno == EINTR) {
2382 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2383 meshlink_errno = MESHLINK_ENETWORK;
2384 pthread_mutex_unlock(&(mesh->mesh_mutex));
2388 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2389 meshlink_errno = MESHLINK_EPEER;
2390 pthread_mutex_unlock(&(mesh->mesh_mutex));
2395 sptps_stop(&mesh->sptps);
2398 closesocket(mesh->sock);
2400 if(!mesh->success) {
2401 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2402 meshlink_errno = MESHLINK_EPEER;
2403 pthread_mutex_unlock(&(mesh->mesh_mutex));
2407 pthread_mutex_unlock(&(mesh->mesh_mutex));
2411 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2412 meshlink_errno = MESHLINK_EINVAL;
2413 pthread_mutex_unlock(&(mesh->mesh_mutex));
2417 char *meshlink_export(meshlink_handle_t *mesh) {
2419 meshlink_errno = MESHLINK_EINVAL;
2425 // Get our config file
2427 pthread_mutex_lock(&(mesh->mesh_mutex));
2429 if(!config_read(mesh, mesh->self->name, &config)) {
2430 meshlink_errno = MESHLINK_ESTORAGE;
2431 pthread_mutex_unlock(&mesh->mesh_mutex);
2435 pthread_mutex_unlock(&(mesh->mesh_mutex));
2437 // Prepare a base64-encoded packmsg array containing our config file
2439 uint8_t *buf = xmalloc(((config.len + 4) * 4) / 3 + 4);
2440 packmsg_output_t out = {buf, config.len + 4};
2441 packmsg_add_array(&out, 1);
2442 packmsg_add_bin(&out, config.buf, config.len);
2443 config_free(&config);
2445 if(!packmsg_output_ok(&out)) {
2446 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2447 meshlink_errno = MESHLINK_EINTERNAL;
2452 b64encode_urlsafe(buf, (char *)buf, packmsg_output_size(&out, buf));
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(&in2);
2502 if(!check_id(name)) {
2507 node_t *n = lookup_node(mesh, name);
2511 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2517 char *submesh_name = packmsg_get_str_dup(&in2);
2520 if(!strcmp(submesh_name, CORE_MESH)) {
2523 n->submesh = lookup_or_create_submesh(mesh, submesh_name);
2526 packmsg_input_invalidate(&in2);
2533 n->devclass = packmsg_get_int32(&in2);
2534 n->status.blacklisted = packmsg_get_bool(&in2);
2536 uint32_t keylen = packmsg_get_bin_raw(&in2, &key);
2539 n->ecdsa = ecdsa_set_public_key(key);
2542 n->canonical_address = packmsg_get_str_dup(&in2);
2543 uint32_t count = packmsg_get_array(&in2);
2549 for(uint32_t i = 0; i < count; i++) {
2550 n->recent[i] = packmsg_get_sockaddr(&in2);
2553 if(!packmsg_done(&in2) || keylen != 32) {
2554 packmsg_input_invalidate(&in2);
2557 config_t config = {data, len};
2558 config_write(mesh, n->name, &config);
2563 pthread_mutex_unlock(&(mesh->mesh_mutex));
2565 if(!packmsg_done(&in)) {
2566 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2567 meshlink_errno = MESHLINK_EPEER;
2574 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2575 if(!mesh || !node) {
2576 meshlink_errno = MESHLINK_EINVAL;
2580 pthread_mutex_lock(&(mesh->mesh_mutex));
2585 if(n == mesh->self) {
2586 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2587 meshlink_errno = MESHLINK_EINVAL;
2588 pthread_mutex_unlock(&(mesh->mesh_mutex));
2592 if(n->status.blacklisted) {
2593 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2594 pthread_mutex_unlock(&(mesh->mesh_mutex));
2598 n->status.blacklisted = true;
2599 n->status.dirty = true;
2600 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2602 //Immediately terminate any connections we have with the blacklisted node
2603 for list_each(connection_t, c, mesh->connections) {
2605 terminate_connection(mesh, c, c->status.active);
2609 utcp_abort_all_connections(n->utcp);
2615 n->status.udp_confirmed = false;
2617 if(n->status.reachable) {
2618 update_node_status(mesh, n);
2621 pthread_mutex_unlock(&(mesh->mesh_mutex));
2624 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2625 if(!mesh || !node) {
2626 meshlink_errno = MESHLINK_EINVAL;
2630 pthread_mutex_lock(&(mesh->mesh_mutex));
2632 node_t *n = (node_t *)node;
2634 if(!n->status.blacklisted) {
2635 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2636 meshlink_errno = MESHLINK_EINVAL;
2637 pthread_mutex_unlock(&(mesh->mesh_mutex));
2641 n->status.blacklisted = false;
2642 n->status.dirty = true;
2644 pthread_mutex_unlock(&(mesh->mesh_mutex));
2648 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2649 mesh->default_blacklist = blacklist;
2652 /* Hint that a hostname may be found at an address
2653 * See header file for detailed comment.
2655 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2656 if(!mesh || !node || !addr) {
2657 meshlink_errno = EINVAL;
2661 pthread_mutex_lock(&(mesh->mesh_mutex));
2663 node_t *n = (node_t *)node;
2664 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2665 memcpy(n->recent, addr, SALEN(*addr));
2666 n->status.dirty = true;
2668 pthread_mutex_unlock(&(mesh->mesh_mutex));
2669 // @TODO do we want to fire off a connection attempt right away?
2672 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2674 node_t *n = utcp->priv;
2675 meshlink_handle_t *mesh = n->mesh;
2676 return mesh->channel_accept_cb;
2679 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2680 meshlink_channel_t *channel = connection->priv;
2686 node_t *n = channel->node;
2687 meshlink_handle_t *mesh = n->mesh;
2689 if(n->status.destroyed) {
2690 meshlink_channel_close(mesh, channel);
2691 } else if(channel->receive_cb) {
2692 channel->receive_cb(mesh, channel, data, len);
2698 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2699 node_t *n = utcp_connection->utcp->priv;
2705 meshlink_handle_t *mesh = n->mesh;
2707 if(!mesh->channel_accept_cb) {
2711 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2713 channel->c = utcp_connection;
2715 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2716 utcp_accept(utcp_connection, channel_recv, channel);
2722 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2723 node_t *n = utcp->priv;
2725 if(n->status.destroyed) {
2729 meshlink_handle_t *mesh = n->mesh;
2730 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2733 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2734 if(!mesh || !channel) {
2735 meshlink_errno = MESHLINK_EINVAL;
2739 channel->receive_cb = cb;
2742 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2744 node_t *n = (node_t *)source;
2750 utcp_recv(n->utcp, data, len);
2753 static void channel_poll(struct utcp_connection *connection, size_t len) {
2754 meshlink_channel_t *channel = connection->priv;
2760 node_t *n = channel->node;
2761 meshlink_handle_t *mesh = n->mesh;
2763 if(channel->poll_cb) {
2764 channel->poll_cb(mesh, channel, len);
2768 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2770 channel->poll_cb = cb;
2771 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2774 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2776 meshlink_errno = MESHLINK_EINVAL;
2780 pthread_mutex_lock(&mesh->mesh_mutex);
2781 mesh->channel_accept_cb = cb;
2782 mesh->receive_cb = channel_receive;
2784 for splay_each(node_t, n, mesh->nodes) {
2785 if(!n->utcp && n != mesh->self) {
2786 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2790 pthread_mutex_unlock(&mesh->mesh_mutex);
2793 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) {
2795 abort(); // TODO: handle non-NULL data
2798 if(!mesh || !node) {
2799 meshlink_errno = MESHLINK_EINVAL;
2803 node_t *n = (node_t *)node;
2806 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2807 mesh->receive_cb = channel_receive;
2810 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2815 if(n->status.blacklisted) {
2816 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
2820 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2822 channel->receive_cb = cb;
2823 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2826 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2834 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) {
2835 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2838 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2839 if(!mesh || !channel) {
2840 meshlink_errno = MESHLINK_EINVAL;
2844 utcp_shutdown(channel->c, direction);
2847 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2848 if(!mesh || !channel) {
2849 meshlink_errno = MESHLINK_EINVAL;
2853 utcp_close(channel->c);
2857 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2858 if(!mesh || !channel) {
2859 meshlink_errno = MESHLINK_EINVAL;
2868 meshlink_errno = MESHLINK_EINVAL;
2872 // TODO: more finegrained locking.
2873 // Ideally we want to put the data into the UTCP connection's send buffer.
2874 // Then, preferably only if there is room in the receiver window,
2875 // kick the meshlink thread to go send packets.
2877 pthread_mutex_lock(&mesh->mesh_mutex);
2878 ssize_t retval = utcp_send(channel->c, data, len);
2879 pthread_mutex_unlock(&mesh->mesh_mutex);
2882 meshlink_errno = MESHLINK_ENETWORK;
2888 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2889 if(!mesh || !channel) {
2890 meshlink_errno = MESHLINK_EINVAL;
2894 return channel->c->flags;
2897 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2898 if(!mesh || !channel) {
2899 meshlink_errno = MESHLINK_EINVAL;
2903 return utcp_get_sendq(channel->c);
2906 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2907 if(!mesh || !channel) {
2908 meshlink_errno = MESHLINK_EINVAL;
2912 return utcp_get_recvq(channel->c);
2915 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2916 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2917 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2920 if(mesh->node_status_cb) {
2921 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
2925 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
2926 if(!mesh->node_duplicate_cb || n->status.duplicate) {
2930 n->status.duplicate = true;
2931 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
2934 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2938 meshlink_errno = MESHLINK_EINVAL;
2942 pthread_mutex_lock(&mesh->mesh_mutex);
2944 if(mesh->discovery == enable) {
2948 if(mesh->threadstarted) {
2950 discovery_start(mesh);
2952 discovery_stop(mesh);
2956 mesh->discovery = enable;
2959 pthread_mutex_unlock(&mesh->mesh_mutex);
2963 meshlink_errno = MESHLINK_ENOTSUP;
2967 static void __attribute__((constructor)) meshlink_init(void) {
2970 randomize(&seed, sizeof(seed));
2974 static void __attribute__((destructor)) meshlink_exit(void) {
2978 /// Device class traits
2979 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2980 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2981 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2982 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2983 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN