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 finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
526 packmsg_input_t in = {buf, len};
527 uint32_t version = packmsg_get_uint32(&in);
529 if(version != MESHLINK_INVITATION_VERSION) {
530 logger(mesh, MESHLINK_ERROR, "Invalid invitation version!\n");
534 char *name = packmsg_get_str_dup(&in);
535 packmsg_skip_element(&in); /* submesh */
536 int32_t devclass = packmsg_get_int32(&in);
537 uint32_t count = packmsg_get_array(&in);
540 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
544 if(!check_id(name)) {
545 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
550 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
554 // Initialize configuration directory
555 if(!config_init(mesh)) {
559 // Write main config file
560 uint8_t outbuf[4096];
561 packmsg_output_t out = {outbuf, sizeof(outbuf)};
562 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
563 packmsg_add_str(&out, name);
564 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
565 packmsg_add_uint16(&out, atoi(mesh->myport));
567 config_t config = {outbuf, packmsg_output_size(&out, outbuf)};
569 if(!main_config_write(mesh, &config)) {
573 // Write our own host config file
575 out.len = sizeof(outbuf);
576 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
577 packmsg_add_str(&out, name);
578 packmsg_add_str(&out, CORE_MESH);
579 packmsg_add_int32(&out, devclass);
580 packmsg_add_bool(&out, false);
581 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
582 packmsg_add_str(&out, ""); // TODO: copy existing canonical address, in case it was added before meshlink_join().
583 packmsg_add_array(&out, 0);
585 config.len = packmsg_output_size(&out, outbuf);
587 if(!config_write(mesh, name, &config)) {
591 // Write host config files
594 uint32_t len = packmsg_get_bin_raw(&in, &data);
597 logger(mesh, MESHLINK_ERROR, "Incomplete invitation file!\n");
601 packmsg_input_t in2 = {data, len};
602 uint32_t version = packmsg_get_uint32(&in2);
604 if(version != MESHLINK_CONFIG_VERSION) {
605 logger(mesh, MESHLINK_ERROR, "Invalid host config file in invitation file!\n");
609 char *host = packmsg_get_str_dup(&in2);
611 if(!check_id(host)) {
612 logger(mesh, MESHLINK_ERROR, "Invalid node name in invitation file!\n");
617 if(!strcmp(host, name)) {
618 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
623 config_t config = {data, len};
624 config_write(mesh, host, &config);
626 node_t *n = new_node();
628 node_read_full(mesh, n);
629 n->devclass = mesh->devclass;
633 sptps_send_record(&(mesh->sptps), 1, ecdsa_get_public_key(mesh->private_key), 32);
636 free(mesh->self->name);
637 mesh->name = xstrdup(name);
638 mesh->self->name = xstrdup(name);
640 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
642 load_all_nodes(mesh);
647 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
649 meshlink_handle_t *mesh = handle;
650 const char *ptr = data;
653 int result = send(mesh->sock, ptr, len, 0);
655 if(result == -1 && errno == EINTR) {
657 } else if(result <= 0) {
668 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
669 meshlink_handle_t *mesh = handle;
672 case SPTPS_HANDSHAKE:
673 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
676 return finalize_join(mesh, msg, len);
679 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
680 shutdown(mesh->sock, SHUT_RDWR);
681 mesh->success = true;
691 static bool recvline(meshlink_handle_t *mesh, size_t len) {
692 char *newline = NULL;
698 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
699 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
701 if(result == -1 && errno == EINTR) {
703 } else if(result <= 0) {
707 mesh->blen += result;
710 if((size_t)(newline - mesh->buffer) >= len) {
714 len = newline - mesh->buffer;
716 memcpy(mesh->line, mesh->buffer, len);
718 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
719 mesh->blen -= len + 1;
723 static bool sendline(int fd, char *format, ...) {
724 static char buffer[4096];
729 va_start(ap, format);
730 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
733 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
741 int result = send(fd, p, blen, MSG_NOSIGNAL);
743 if(result == -1 && errno == EINTR) {
745 } else if(result <= 0) {
756 static const char *errstr[] = {
757 [MESHLINK_OK] = "No error",
758 [MESHLINK_EINVAL] = "Invalid argument",
759 [MESHLINK_ENOMEM] = "Out of memory",
760 [MESHLINK_ENOENT] = "No such node",
761 [MESHLINK_EEXIST] = "Node already exists",
762 [MESHLINK_EINTERNAL] = "Internal error",
763 [MESHLINK_ERESOLV] = "Could not resolve hostname",
764 [MESHLINK_ESTORAGE] = "Storage error",
765 [MESHLINK_ENETWORK] = "Network error",
766 [MESHLINK_EPEER] = "Error communicating with peer",
767 [MESHLINK_ENOTSUP] = "Operation not supported",
768 [MESHLINK_EBUSY] = "MeshLink instance already in use",
771 const char *meshlink_strerror(meshlink_errno_t err) {
772 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
773 return "Invalid error code";
779 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
780 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypairs:\n");
782 mesh->private_key = ecdsa_generate();
783 mesh->invitation_key = ecdsa_generate();
785 if(!mesh->private_key || !mesh->invitation_key) {
786 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
787 meshlink_errno = MESHLINK_EINTERNAL;
791 logger(mesh, MESHLINK_DEBUG, "Done.\n");
796 static struct timeval idle(event_loop_t *loop, void *data) {
798 meshlink_handle_t *mesh = data;
799 struct timeval t, tmin = {3600, 0};
801 for splay_each(node_t, n, mesh->nodes) {
806 t = utcp_timeout(n->utcp);
808 if(timercmp(&t, &tmin, <)) {
816 // Get our local address(es) by simulating connecting to an Internet host.
817 static void add_local_addresses(meshlink_handle_t *mesh) {
818 struct sockaddr_storage sn;
819 socklen_t sl = sizeof(sn);
823 if(getlocaladdr("93.184.216.34", (struct sockaddr *)&sn, &sl, mesh->netns)) {
824 ((struct sockaddr_in *)&sn)->sin_port = ntohs(atoi(mesh->myport));
825 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
832 if(getlocaladdr("2606:2800:220:1:248:1893:25c8:1946", (struct sockaddr *)&sn, &sl, mesh->netns)) {
833 ((struct sockaddr_in6 *)&sn)->sin6_port = ntohs(atoi(mesh->myport));
834 meshlink_hint_address(mesh, (meshlink_node_t *)mesh->self, (struct sockaddr *)&sn);
839 static bool meshlink_write_config(meshlink_handle_t *mesh) {
841 packmsg_output_t out = {buf, sizeof buf};
842 packmsg_add_str(&out, mesh->name);
843 packmsg_add_uint32(&out, mesh->devclass);
844 packmsg_add_uint16(&out, mesh->port);
845 packmsg_add_bin(&out, ecdsa, sizeof(ecdsa));
846 uint32_t len = packmsg_output_size(&out, buf);
849 logger(mesh, MESHLINK_DEBUG, "Could not create configuration data\n",);
850 meshlink_errno = MESHLINK_EINTERNAL;
856 static bool meshlink_setup(meshlink_handle_t *mesh) {
857 if(!config_init(mesh)) {
858 logger(mesh, MESHLINK_ERROR, "Could not set up configuration in %s: %s\n", mesh->confbase, strerror(errno));
859 meshlink_errno = MESHLINK_ESTORAGE;
863 if(!ecdsa_keygen(mesh)) {
864 meshlink_errno = MESHLINK_EINTERNAL;
868 if(check_port(mesh) == 0) {
869 meshlink_errno = MESHLINK_ENETWORK;
873 /* Create a node for ourself */
875 mesh->self = new_node();
876 mesh->self->name = xstrdup(mesh->name);
877 mesh->self->devclass = mesh->devclass;
878 mesh->self->ecdsa = ecdsa_set_public_key(ecdsa_get_public_key(mesh->private_key));
880 // Write the main config file
882 packmsg_output_t out = {buf, sizeof(buf)};
884 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
885 packmsg_add_str(&out, mesh->name);
886 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->private_key), 96);
887 packmsg_add_bin(&out, ecdsa_get_private_key(mesh->invitation_key), 96);
888 packmsg_add_uint16(&out, atoi(mesh->myport));
890 config_t config = {buf, packmsg_output_size(&out, buf)};
892 if(!main_config_write(mesh, &config)) {
896 // Write our own host config file
898 out.len = sizeof(buf);
899 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
900 packmsg_add_str(&out, mesh->name);
901 packmsg_add_int32(&out, mesh->devclass);
902 packmsg_add_bool(&out, false);
903 packmsg_add_bin(&out, ecdsa_get_public_key(mesh->private_key), 32);
904 packmsg_add_str(&out, ""); // TODO: copy existing canonical address, in case it was added before meshlink_join().
905 packmsg_add_array(&out, 0);
907 config.len = packmsg_output_size(&out, buf);
909 if(!config_write(mesh, mesh->name, &config)) {
916 static bool meshlink_read_config(meshlink_handle_t *mesh) {
917 // Open the configuration file and lock it
918 if(!main_config_lock(mesh)) {
919 logger(NULL, MESHLINK_ERROR, "Cannot lock main config file\n");
920 meshlink_errno = MESHLINK_ESTORAGE;
926 if(!main_config_read(mesh, &config)) {
927 logger(NULL, MESHLINK_ERROR, "Could not read main configuration file!");
931 packmsg_input_t in = {config.buf, config.len};
932 const void *private_key;
933 const void *invitation_key;
935 uint32_t version = packmsg_get_uint32(&in);
936 char *name = packmsg_get_str_dup(&in);
937 uint32_t private_key_len = packmsg_get_bin_raw(&in, &private_key);
938 uint32_t invitation_key_len = packmsg_get_bin_raw(&in, &invitation_key);
939 uint16_t myport = packmsg_get_uint16(&in);
941 if(!packmsg_done(&in) || version != MESHLINK_CONFIG_VERSION || private_key_len != 96 || invitation_key_len != 96) {
942 logger(NULL, MESHLINK_ERROR, "Error parsing main configuration file!");
944 config_free(&config);
951 if(mesh->name && strcmp(mesh->name, name)) {
952 logger(NULL, MESHLINK_ERROR, "Configuration is for a different name (%s)!", name);
953 meshlink_errno = MESHLINK_ESTORAGE;
955 config_free(&config);
963 xasprintf(&mesh->myport, "%u", myport);
964 mesh->private_key = ecdsa_set_private_key(private_key);
965 mesh->invitation_key = ecdsa_set_private_key(invitation_key);
966 config_free(&config);
968 /* Create a node for ourself and read our host configuration file */
970 mesh->self = new_node();
971 mesh->self->name = xstrdup(name);
972 mesh->self->devclass = mesh->devclass;
974 if(!node_read_public_key(mesh, mesh->self)) {
975 logger(NULL, MESHLINK_ERROR, "Could not read our host configuration file!");
976 free_node(mesh->self);
984 static void *setup_network_in_netns_thread(void *arg) {
985 meshlink_handle_t *mesh = arg;
987 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
991 bool success = setup_network(mesh);
992 add_local_addresses(mesh);
993 return success ? arg : NULL;
996 meshlink_open_params_t *meshlink_open_params_init(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
997 if(!confbase || !*confbase) {
998 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
999 meshlink_errno = MESHLINK_EINVAL;
1003 if(!appname || !*appname) {
1004 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1005 meshlink_errno = MESHLINK_EINVAL;
1009 if(strchr(appname, ' ')) {
1010 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1011 meshlink_errno = MESHLINK_EINVAL;
1015 if(!name || !*name) {
1016 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1018 } else { //check name only if there is a name != NULL
1019 if(!check_id(name)) {
1020 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1021 meshlink_errno = MESHLINK_EINVAL;
1026 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1027 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1028 meshlink_errno = MESHLINK_EINVAL;
1032 meshlink_open_params_t *params = xzalloc(sizeof * params);
1034 params->confbase = xstrdup(confbase);
1035 params->name = xstrdup(name);
1036 params->appname = xstrdup(appname);
1037 params->devclass = devclass;
1043 bool meshlink_open_params_set_netns(meshlink_open_params_t *params, int netns) {
1045 meshlink_errno = MESHLINK_EINVAL;
1049 params->netns = netns;
1054 bool meshlink_open_params_set_storage_key(meshlink_open_params_t *params, const void *key, size_t keylen) {
1056 meshlink_errno = MESHLINK_EINVAL;
1060 if((!key && keylen) || (key && !keylen)) {
1061 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1062 meshlink_errno = MESHLINK_EINVAL;
1067 params->keylen = keylen;
1072 void meshlink_open_params_free(meshlink_open_params_t *params) {
1074 meshlink_errno = MESHLINK_EINVAL;
1078 free(params->confbase);
1080 free(params->appname);
1085 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1086 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1087 meshlink_open_params_t params = {NULL};
1089 params.confbase = (char *)confbase;
1090 params.name = (char *)name;
1091 params.appname = (char *)appname;
1092 params.devclass = devclass;
1095 return meshlink_open_ex(¶ms);
1098 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) {
1099 /* Create a temporary struct on the stack, to avoid allocating and freeing one. */
1100 meshlink_open_params_t params = {NULL};
1102 params.confbase = (char *)confbase;
1103 params.name = (char *)name;
1104 params.appname = (char *)appname;
1105 params.devclass = devclass;
1108 if(!meshlink_open_params_set_storage_key(¶ms, key, keylen)) {
1112 return meshlink_open_ex(¶ms);
1115 meshlink_handle_t *meshlink_open_ex(const meshlink_open_params_t *params) {
1116 // Validate arguments provided by the application
1117 bool usingname = false;
1119 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1121 if(!params->confbase || !*params->confbase) {
1122 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1123 meshlink_errno = MESHLINK_EINVAL;
1127 if(!params->appname || !*params->appname) {
1128 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1129 meshlink_errno = MESHLINK_EINVAL;
1133 if(strchr(params->appname, ' ')) {
1134 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1135 meshlink_errno = MESHLINK_EINVAL;
1139 if(!params->name || !*params->name) {
1140 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1142 } else { //check name only if there is a name != NULL
1144 if(!check_id(params->name)) {
1145 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1146 meshlink_errno = MESHLINK_EINVAL;
1153 if((int)params->devclass < 0 || params->devclass > _DEV_CLASS_MAX) {
1154 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1155 meshlink_errno = MESHLINK_EINVAL;
1159 if((params->key && !params->keylen) || (!params->key && params->keylen)) {
1160 logger(NULL, MESHLINK_ERROR, "Invalid key length!\n");
1161 meshlink_errno = MESHLINK_EINVAL;
1165 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1166 mesh->confbase = xstrdup(params->confbase);
1167 mesh->appname = xstrdup(params->appname);
1168 mesh->devclass = params->devclass;
1169 mesh->discovery = true;
1170 mesh->invitation_timeout = 604800; // 1 week
1171 mesh->netns = params->netns;
1172 mesh->submeshes = NULL;
1175 mesh->name = xstrdup(params->name);
1180 mesh->config_key = xmalloc(CHACHA_POLY1305_KEYLEN);
1182 if(!prf(params->key, params->keylen, "MeshLink configuration key", 26, mesh->config_key, CHACHA_POLY1305_KEYLEN)) {
1183 logger(NULL, MESHLINK_ERROR, "Error creating configuration key!\n");
1184 meshlink_errno = MESHLINK_EINTERNAL;
1190 pthread_mutexattr_t attr;
1191 pthread_mutexattr_init(&attr);
1192 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1193 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1195 mesh->threadstarted = false;
1196 event_loop_init(&mesh->loop);
1197 mesh->loop.data = mesh;
1199 meshlink_queue_init(&mesh->outpacketqueue);
1201 // If no configuration exists yet, create it.
1203 if(!main_config_exists(mesh)) {
1204 if(!meshlink_setup(mesh)) {
1205 logger(NULL, MESHLINK_ERROR, "Cannot create initial configuration\n");
1206 meshlink_close(mesh);
1210 if(!meshlink_read_config(mesh)) {
1211 logger(NULL, MESHLINK_ERROR, "Cannot read main configuration\n");
1212 meshlink_close(mesh);
1218 struct WSAData wsa_state;
1219 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1222 // Setup up everything
1223 // TODO: we should not open listening sockets yet
1225 bool success = false;
1227 if(mesh->netns != -1) {
1230 if(pthread_create(&thr, NULL, setup_network_in_netns_thread, mesh) == 0) {
1231 void *retval = NULL;
1232 success = pthread_join(thr, &retval) == 0 && retval;
1235 success = setup_network(mesh);
1236 add_local_addresses(mesh);
1240 meshlink_close(mesh);
1241 meshlink_errno = MESHLINK_ENETWORK;
1245 add_local_addresses(mesh);
1246 node_write_config(mesh, mesh->self);
1248 idle_set(&mesh->loop, idle, mesh);
1250 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1254 meshlink_submesh_t *meshlink_submesh_open(meshlink_handle_t *mesh, const char *submesh) {
1255 meshlink_submesh_t *s = NULL;
1258 logger(NULL, MESHLINK_ERROR, "No mesh handle given!\n");
1259 meshlink_errno = MESHLINK_EINVAL;
1263 if(!submesh || !*submesh) {
1264 logger(NULL, MESHLINK_ERROR, "No submesh name given!\n");
1265 meshlink_errno = MESHLINK_EINVAL;
1270 pthread_mutex_lock(&(mesh->mesh_mutex));
1272 s = (meshlink_submesh_t *)create_submesh(mesh, submesh);
1274 pthread_mutex_unlock(&(mesh->mesh_mutex));
1279 static void *meshlink_main_loop(void *arg) {
1280 meshlink_handle_t *mesh = arg;
1282 if(mesh->netns != -1) {
1283 if(setns(mesh->netns, CLONE_NEWNET) != 0) {
1288 pthread_mutex_lock(&(mesh->mesh_mutex));
1290 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1292 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1294 pthread_mutex_unlock(&(mesh->mesh_mutex));
1298 bool meshlink_start(meshlink_handle_t *mesh) {
1300 assert(mesh->private_key);
1303 meshlink_errno = MESHLINK_EINVAL;
1307 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1309 pthread_mutex_lock(&(mesh->mesh_mutex));
1311 if(mesh->threadstarted) {
1312 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1313 pthread_mutex_unlock(&(mesh->mesh_mutex));
1317 if(mesh->listen_socket[0].tcp.fd < 0) {
1318 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1319 meshlink_errno = MESHLINK_ENETWORK;
1323 mesh->thedatalen = 0;
1325 // TODO: open listening sockets first
1327 //Check that a valid name is set
1329 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1330 meshlink_errno = MESHLINK_EINVAL;
1331 pthread_mutex_unlock(&(mesh->mesh_mutex));
1335 init_outgoings(mesh);
1337 // Start the main thread
1339 event_loop_start(&mesh->loop);
1341 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1342 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1343 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1344 meshlink_errno = MESHLINK_EINTERNAL;
1345 event_loop_stop(&mesh->loop);
1346 pthread_mutex_unlock(&(mesh->mesh_mutex));
1350 mesh->threadstarted = true;
1354 if(mesh->discovery) {
1355 discovery_start(mesh);
1360 assert(mesh->self->ecdsa);
1361 assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
1364 pthread_mutex_unlock(&(mesh->mesh_mutex));
1368 void meshlink_stop(meshlink_handle_t *mesh) {
1370 meshlink_errno = MESHLINK_EINVAL;
1374 pthread_mutex_lock(&(mesh->mesh_mutex));
1375 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1380 if(mesh->discovery) {
1381 discovery_stop(mesh);
1386 // Shut down the main thread
1387 event_loop_stop(&mesh->loop);
1389 // Send ourselves a UDP packet to kick the event loop
1390 for(int i = 0; i < mesh->listen_sockets; i++) {
1392 socklen_t salen = sizeof(sa.sa);
1394 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1395 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1399 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1400 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1404 if(mesh->threadstarted) {
1405 // Wait for the main thread to finish
1406 pthread_mutex_unlock(&(mesh->mesh_mutex));
1407 pthread_join(mesh->thread, NULL);
1408 pthread_mutex_lock(&(mesh->mesh_mutex));
1410 mesh->threadstarted = false;
1413 // Close all metaconnections
1414 if(mesh->connections) {
1415 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1417 connection_t *c = node->data;
1419 terminate_connection(mesh, c, false);
1423 exit_outgoings(mesh);
1425 pthread_mutex_unlock(&(mesh->mesh_mutex));
1428 void meshlink_close(meshlink_handle_t *mesh) {
1429 if(!mesh || !mesh->confbase) {
1430 meshlink_errno = MESHLINK_EINVAL;
1434 // stop can be called even if mesh has not been started
1435 meshlink_stop(mesh);
1437 // lock is not released after this
1438 pthread_mutex_lock(&(mesh->mesh_mutex));
1440 // Close and free all resources used.
1442 close_network_connections(mesh);
1444 logger(mesh, MESHLINK_INFO, "Terminating");
1446 event_loop_exit(&mesh->loop);
1450 if(mesh->confbase) {
1456 ecdsa_free(mesh->invitation_key);
1458 if(mesh->netns != -1) {
1463 free(mesh->appname);
1464 free(mesh->confbase);
1465 pthread_mutex_destroy(&(mesh->mesh_mutex));
1467 main_config_unlock(mesh);
1469 memset(mesh, 0, sizeof(*mesh));
1474 bool meshlink_destroy(const char *confbase) {
1476 meshlink_errno = MESHLINK_EINVAL;
1480 return config_destroy(confbase);
1483 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1485 meshlink_errno = MESHLINK_EINVAL;
1489 pthread_mutex_lock(&(mesh->mesh_mutex));
1490 mesh->receive_cb = cb;
1491 pthread_mutex_unlock(&(mesh->mesh_mutex));
1494 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1496 meshlink_errno = MESHLINK_EINVAL;
1500 pthread_mutex_lock(&(mesh->mesh_mutex));
1501 mesh->node_status_cb = cb;
1502 pthread_mutex_unlock(&(mesh->mesh_mutex));
1505 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1507 meshlink_errno = MESHLINK_EINVAL;
1511 pthread_mutex_lock(&(mesh->mesh_mutex));
1512 mesh->node_duplicate_cb = cb;
1513 pthread_mutex_unlock(&(mesh->mesh_mutex));
1516 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1518 pthread_mutex_lock(&(mesh->mesh_mutex));
1520 mesh->log_level = cb ? level : 0;
1521 pthread_mutex_unlock(&(mesh->mesh_mutex));
1524 global_log_level = cb ? level : 0;
1528 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1529 meshlink_packethdr_t *hdr;
1531 // Validate arguments
1532 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1533 meshlink_errno = MESHLINK_EINVAL;
1542 meshlink_errno = MESHLINK_EINVAL;
1546 node_t *n = (node_t *)destination;
1548 if(n->status.blacklisted) {
1549 logger(mesh, MESHLINK_ERROR, "Node %s blacklisted, dropping packet\n", n->name);
1553 // Prepare the packet
1554 vpn_packet_t *packet = malloc(sizeof(*packet));
1557 meshlink_errno = MESHLINK_ENOMEM;
1561 packet->probe = false;
1562 packet->tcp = false;
1563 packet->len = len + sizeof(*hdr);
1565 hdr = (meshlink_packethdr_t *)packet->data;
1566 memset(hdr, 0, sizeof(*hdr));
1567 // leave the last byte as 0 to make sure strings are always
1568 // null-terminated if they are longer than the buffer
1569 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1570 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1572 memcpy(packet->data + sizeof(*hdr), data, len);
1575 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1577 meshlink_errno = MESHLINK_ENOMEM;
1581 // Notify event loop
1582 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1587 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1589 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1595 mesh->self->in_packets++;
1596 mesh->self->in_bytes += packet->len;
1597 route(mesh, mesh->self, packet);
1600 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1601 if(!mesh || !destination) {
1602 meshlink_errno = MESHLINK_EINVAL;
1606 pthread_mutex_lock(&(mesh->mesh_mutex));
1608 node_t *n = (node_t *)destination;
1610 if(!n->status.reachable) {
1611 pthread_mutex_unlock(&(mesh->mesh_mutex));
1614 } else if(n->mtuprobes > 30 && n->minmtu) {
1615 pthread_mutex_unlock(&(mesh->mesh_mutex));
1618 pthread_mutex_unlock(&(mesh->mesh_mutex));
1623 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1624 if(!mesh || !node) {
1625 meshlink_errno = MESHLINK_EINVAL;
1629 pthread_mutex_lock(&(mesh->mesh_mutex));
1631 node_t *n = (node_t *)node;
1633 if(!node_read_public_key(mesh, n) || !n->ecdsa) {
1634 meshlink_errno = MESHLINK_EINTERNAL;
1635 pthread_mutex_unlock(&(mesh->mesh_mutex));
1639 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1642 meshlink_errno = MESHLINK_EINTERNAL;
1645 pthread_mutex_unlock(&(mesh->mesh_mutex));
1649 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1651 meshlink_errno = MESHLINK_EINVAL;
1655 return (meshlink_node_t *)mesh->self;
1658 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1659 if(!mesh || !name) {
1660 meshlink_errno = MESHLINK_EINVAL;
1664 meshlink_node_t *node = NULL;
1666 pthread_mutex_lock(&(mesh->mesh_mutex));
1667 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1668 pthread_mutex_unlock(&(mesh->mesh_mutex));
1672 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1673 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1674 meshlink_errno = MESHLINK_EINVAL;
1678 meshlink_node_t **result;
1681 pthread_mutex_lock(&(mesh->mesh_mutex));
1683 *nmemb = mesh->nodes->count;
1684 result = realloc(nodes, *nmemb * sizeof(*nodes));
1687 meshlink_node_t **p = result;
1689 for splay_each(node_t, n, mesh->nodes) {
1690 *p++ = (meshlink_node_t *)n;
1695 meshlink_errno = MESHLINK_ENOMEM;
1698 pthread_mutex_unlock(&(mesh->mesh_mutex));
1703 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) {
1704 meshlink_node_t **result;
1706 pthread_mutex_lock(&(mesh->mesh_mutex));
1710 for splay_each(node_t, n, mesh->nodes) {
1711 if(true == search_node(n, condition)) {
1712 *nmemb = *nmemb + 1;
1718 pthread_mutex_unlock(&(mesh->mesh_mutex));
1722 result = realloc(nodes, *nmemb * sizeof(*nodes));
1725 meshlink_node_t **p = result;
1727 for splay_each(node_t, n, mesh->nodes) {
1728 if(true == search_node(n, condition)) {
1729 *p++ = (meshlink_node_t *)n;
1735 meshlink_errno = MESHLINK_ENOMEM;
1738 pthread_mutex_unlock(&(mesh->mesh_mutex));
1743 static bool search_node_by_dev_class(const node_t *node, const void *condition) {
1744 dev_class_t *devclass = (dev_class_t *)condition;
1746 if(*devclass == node->devclass) {
1753 static bool search_node_by_submesh(const node_t *node, const void *condition) {
1754 if(condition == node->submesh) {
1761 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) {
1762 if(!mesh || ((int)devclass < 0) || (devclass > _DEV_CLASS_MAX) || !nmemb) {
1763 meshlink_errno = MESHLINK_EINVAL;
1767 return meshlink_get_all_nodes_by_condition(mesh, &devclass, nodes, nmemb, search_node_by_dev_class);
1770 meshlink_node_t **meshlink_get_all_nodes_by_submesh(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, meshlink_node_t **nodes, size_t *nmemb) {
1771 if(!mesh || !submesh || !nmemb) {
1772 meshlink_errno = MESHLINK_EINVAL;
1776 return meshlink_get_all_nodes_by_condition(mesh, submesh, nodes, nmemb, search_node_by_submesh);
1779 dev_class_t meshlink_get_node_dev_class(meshlink_handle_t *mesh, meshlink_node_t *node) {
1780 if(!mesh || !node) {
1781 meshlink_errno = MESHLINK_EINVAL;
1785 dev_class_t devclass;
1787 pthread_mutex_lock(&(mesh->mesh_mutex));
1789 devclass = ((node_t *)node)->devclass;
1791 pthread_mutex_unlock(&(mesh->mesh_mutex));
1796 meshlink_submesh_t *meshlink_get_node_submesh(meshlink_handle_t *mesh, meshlink_node_t *node) {
1797 if(!mesh || !node) {
1798 meshlink_errno = MESHLINK_EINVAL;
1802 node_t *n = (node_t *)node;
1804 meshlink_submesh_t *s;
1806 s = (meshlink_submesh_t *)n->submesh;
1811 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1812 if(!mesh || !data || !len || !signature || !siglen) {
1813 meshlink_errno = MESHLINK_EINVAL;
1817 if(*siglen < MESHLINK_SIGLEN) {
1818 meshlink_errno = MESHLINK_EINVAL;
1822 pthread_mutex_lock(&(mesh->mesh_mutex));
1824 if(!ecdsa_sign(mesh->private_key, data, len, signature)) {
1825 meshlink_errno = MESHLINK_EINTERNAL;
1826 pthread_mutex_unlock(&(mesh->mesh_mutex));
1830 *siglen = MESHLINK_SIGLEN;
1831 pthread_mutex_unlock(&(mesh->mesh_mutex));
1835 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1836 if(!mesh || !data || !len || !signature) {
1837 meshlink_errno = MESHLINK_EINVAL;
1841 if(siglen != MESHLINK_SIGLEN) {
1842 meshlink_errno = MESHLINK_EINVAL;
1846 pthread_mutex_lock(&(mesh->mesh_mutex));
1850 struct node_t *n = (struct node_t *)source;
1852 if(!node_read_public_key(mesh, n)) {
1853 meshlink_errno = MESHLINK_EINTERNAL;
1856 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1859 pthread_mutex_unlock(&(mesh->mesh_mutex));
1863 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1864 pthread_mutex_lock(&(mesh->mesh_mutex));
1866 size_t count = invitation_purge_old(mesh, time(NULL) - mesh->invitation_timeout);
1869 // TODO: Update invitation key if necessary?
1872 pthread_mutex_unlock(&(mesh->mesh_mutex));
1874 return mesh->invitation_key;
1877 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1878 if(!mesh || !node || !address) {
1879 meshlink_errno = MESHLINK_EINVAL;
1883 if(!is_valid_hostname(address)) {
1884 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1885 meshlink_errno = MESHLINK_EINVAL;
1889 if(port && !is_valid_port(port)) {
1890 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1891 meshlink_errno = MESHLINK_EINVAL;
1895 char *canonical_address;
1898 xasprintf(&canonical_address, "%s %s", address, port);
1900 canonical_address = xstrdup(address);
1903 pthread_mutex_lock(&(mesh->mesh_mutex));
1905 node_t *n = (node_t *)node;
1906 free(n->canonical_address);
1907 n->canonical_address = canonical_address;
1908 n->status.dirty = true;
1910 pthread_mutex_unlock(&(mesh->mesh_mutex));
1915 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1916 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
1919 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1921 meshlink_errno = MESHLINK_EINVAL;
1925 char *address = meshlink_get_external_address(mesh);
1931 bool rval = meshlink_add_address(mesh, address);
1937 int meshlink_get_port(meshlink_handle_t *mesh) {
1939 meshlink_errno = MESHLINK_EINVAL;
1944 meshlink_errno = MESHLINK_EINTERNAL;
1948 return atoi(mesh->myport);
1951 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1952 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1953 meshlink_errno = MESHLINK_EINVAL;
1957 if(mesh->myport && port == atoi(mesh->myport)) {
1961 if(!try_bind(port)) {
1962 meshlink_errno = MESHLINK_ENETWORK;
1968 pthread_mutex_lock(&(mesh->mesh_mutex));
1970 if(mesh->threadstarted) {
1971 meshlink_errno = MESHLINK_EINVAL;
1975 close_network_connections(mesh);
1977 // TODO: write meshlink.conf again
1979 if(!setup_network(mesh)) {
1980 meshlink_errno = MESHLINK_ENETWORK;
1986 pthread_mutex_unlock(&(mesh->mesh_mutex));
1991 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
1992 mesh->invitation_timeout = timeout;
1995 char *meshlink_invite_ex(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name, uint32_t flags) {
1996 meshlink_submesh_t *s = NULL;
1999 meshlink_errno = MESHLINK_EINVAL;
2004 s = (meshlink_submesh_t *)lookup_submesh(mesh, submesh->name);
2007 logger(mesh, MESHLINK_DEBUG, "Invalid SubMesh Handle.\n");
2008 meshlink_errno = MESHLINK_EINVAL;
2012 s = (meshlink_submesh_t *)mesh->self->submesh;
2015 pthread_mutex_lock(&(mesh->mesh_mutex));
2017 // Check validity of the new node's name
2018 if(!check_id(name)) {
2019 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2020 meshlink_errno = MESHLINK_EINVAL;
2021 pthread_mutex_unlock(&(mesh->mesh_mutex));
2025 // Ensure no host configuration file with that name exists
2026 if(config_exists(mesh, name)) {
2027 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2028 meshlink_errno = MESHLINK_EEXIST;
2029 pthread_mutex_unlock(&(mesh->mesh_mutex));
2033 // Ensure no other nodes know about this name
2034 if(meshlink_get_node(mesh, name)) {
2035 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2036 meshlink_errno = MESHLINK_EEXIST;
2037 pthread_mutex_unlock(&(mesh->mesh_mutex));
2041 // Get the local address
2042 char *address = get_my_hostname(mesh, flags);
2045 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2046 meshlink_errno = MESHLINK_ERESOLV;
2047 pthread_mutex_unlock(&(mesh->mesh_mutex));
2051 if(!refresh_invitation_key(mesh)) {
2052 meshlink_errno = MESHLINK_EINTERNAL;
2053 pthread_mutex_unlock(&(mesh->mesh_mutex));
2059 // Create a hash of the key.
2060 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2061 sha512(fingerprint, strlen(fingerprint), hash);
2062 b64encode_urlsafe(hash, hash, 18);
2064 // Create a random cookie for this invitation.
2066 randomize(cookie, 18);
2068 // Create a filename that doesn't reveal the cookie itself
2069 char buf[18 + strlen(fingerprint)];
2070 char cookiehash[64];
2071 memcpy(buf, cookie, 18);
2072 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2073 sha512(buf, sizeof(buf), cookiehash);
2074 b64encode_urlsafe(cookiehash, cookiehash, 18);
2076 b64encode_urlsafe(cookie, cookie, 18);
2080 /* Construct the invitation file */
2081 uint8_t outbuf[4096];
2082 packmsg_output_t inv = {outbuf, sizeof(outbuf)};
2084 packmsg_add_uint32(&inv, MESHLINK_INVITATION_VERSION);
2085 packmsg_add_str(&inv, name);
2086 packmsg_add_str(&inv, s ? s->name : CORE_MESH);
2087 packmsg_add_int32(&inv, DEV_CLASS_UNKNOWN); /* TODO: allow this to be set by inviter? */
2089 /* TODO: Add several host config files to bootstrap connections */
2090 config_t configs[5] = {NULL};
2093 if(config_read(mesh, mesh->self->name, &configs[count])) {
2097 /* Append host config files to the invitation file */
2098 packmsg_add_array(&inv, count);
2100 for(int i = 0; i < count; i++) {
2101 packmsg_add_bin(&inv, configs[i].buf, configs[i].len);
2102 config_free(&configs[i]);
2105 config_t config = {outbuf, packmsg_output_size(&inv, outbuf)};
2107 if(!invitation_write(mesh, cookiehash, &config)) {
2108 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", cookiehash, strerror(errno));
2109 meshlink_errno = MESHLINK_ESTORAGE;
2110 pthread_mutex_unlock(&(mesh->mesh_mutex));
2114 // Create an URL from the local address, key hash and cookie
2116 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2119 pthread_mutex_unlock(&(mesh->mesh_mutex));
2123 char *meshlink_invite(meshlink_handle_t *mesh, meshlink_submesh_t *submesh, const char *name) {
2124 return meshlink_invite_ex(mesh, submesh, name, 0);
2127 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2128 if(!mesh || !invitation) {
2129 meshlink_errno = MESHLINK_EINVAL;
2133 pthread_mutex_lock(&(mesh->mesh_mutex));
2135 //Before doing meshlink_join make sure we are not connected to another mesh
2136 if(mesh->threadstarted) {
2137 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2138 meshlink_errno = MESHLINK_EINVAL;
2139 pthread_mutex_unlock(&(mesh->mesh_mutex));
2143 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2144 char copy[strlen(invitation) + 1];
2145 strcpy(copy, invitation);
2147 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2149 char *slash = strchr(copy, '/');
2157 if(strlen(slash) != 48) {
2161 char *address = copy;
2164 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2168 // Generate a throw-away key for the invitation.
2169 ecdsa_t *key = ecdsa_generate();
2172 meshlink_errno = MESHLINK_EINTERNAL;
2173 pthread_mutex_unlock(&(mesh->mesh_mutex));
2177 char *b64key = ecdsa_get_base64_public_key(key);
2181 while(address && *address) {
2182 // We allow commas in the address part to support multiple addresses in one invitation URL.
2183 comma = strchr(address, ',');
2189 // Split of the port
2190 port = strrchr(address, ':');
2198 // IPv6 address are enclosed in brackets, per RFC 3986
2199 if(*address == '[') {
2201 char *bracket = strchr(address, ']');
2214 // Connect to the meshlink daemon mentioned in the URL.
2215 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2218 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2219 mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
2221 if(mesh->sock == -1) {
2222 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2223 meshlink_errno = MESHLINK_ENETWORK;
2227 set_timeout(mesh->sock, 5000);
2229 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2230 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2231 meshlink_errno = MESHLINK_ENETWORK;
2232 closesocket(mesh->sock);
2240 meshlink_errno = MESHLINK_ERESOLV;
2243 if(mesh->sock != -1 || !comma) {
2250 if(mesh->sock == -1) {
2251 pthread_mutex_unlock(&mesh->mesh_mutex);
2255 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2257 // Tell him we have an invitation, and give him our throw-away key.
2261 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, 1, mesh->appname)) {
2262 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2263 closesocket(mesh->sock);
2264 meshlink_errno = MESHLINK_ENETWORK;
2265 pthread_mutex_unlock(&(mesh->mesh_mutex));
2271 char hisname[4096] = "";
2272 int code, hismajor, hisminor = 0;
2274 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) {
2275 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2276 closesocket(mesh->sock);
2277 meshlink_errno = MESHLINK_ENETWORK;
2278 pthread_mutex_unlock(&(mesh->mesh_mutex));
2282 // Check if the hash of the key he gave us matches the hash in the URL.
2283 char *fingerprint = mesh->line + 2;
2286 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2287 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2288 meshlink_errno = MESHLINK_EINTERNAL;
2289 pthread_mutex_unlock(&(mesh->mesh_mutex));
2293 if(memcmp(hishash, mesh->hash, 18)) {
2294 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2295 meshlink_errno = MESHLINK_EPEER;
2296 pthread_mutex_unlock(&(mesh->mesh_mutex));
2301 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2304 meshlink_errno = MESHLINK_EINTERNAL;
2305 pthread_mutex_unlock(&(mesh->mesh_mutex));
2309 // Start an SPTPS session
2310 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2311 meshlink_errno = MESHLINK_EINTERNAL;
2312 pthread_mutex_unlock(&(mesh->mesh_mutex));
2316 // Feed rest of input buffer to SPTPS
2317 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2318 meshlink_errno = MESHLINK_EPEER;
2319 pthread_mutex_unlock(&(mesh->mesh_mutex));
2325 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2327 if(errno == EINTR) {
2331 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2332 meshlink_errno = MESHLINK_ENETWORK;
2333 pthread_mutex_unlock(&(mesh->mesh_mutex));
2337 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2338 meshlink_errno = MESHLINK_EPEER;
2339 pthread_mutex_unlock(&(mesh->mesh_mutex));
2344 sptps_stop(&mesh->sptps);
2347 closesocket(mesh->sock);
2349 if(!mesh->success) {
2350 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2351 meshlink_errno = MESHLINK_EPEER;
2352 pthread_mutex_unlock(&(mesh->mesh_mutex));
2356 pthread_mutex_unlock(&(mesh->mesh_mutex));
2360 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2361 meshlink_errno = MESHLINK_EINVAL;
2362 pthread_mutex_unlock(&(mesh->mesh_mutex));
2366 char *meshlink_export(meshlink_handle_t *mesh) {
2368 meshlink_errno = MESHLINK_EINVAL;
2374 // Get our config file
2376 pthread_mutex_lock(&(mesh->mesh_mutex));
2378 if(!config_read(mesh, mesh->self->name, &config)) {
2379 meshlink_errno = MESHLINK_ESTORAGE;
2380 pthread_mutex_unlock(&mesh->mesh_mutex);
2384 pthread_mutex_unlock(&(mesh->mesh_mutex));
2386 // Prepare a base64-encoded packmsg array containing our config file
2388 uint8_t *buf = xmalloc(((config.len + 4) * 4) / 3 + 4);
2389 packmsg_output_t out = {buf, config.len + 4};
2390 packmsg_add_array(&out, 1);
2391 packmsg_add_bin(&out, config.buf, config.len);
2392 config_free(&config);
2394 if(!packmsg_output_ok(&out)) {
2395 logger(mesh, MESHLINK_DEBUG, "Error creating export data\n");
2396 meshlink_errno = MESHLINK_EINTERNAL;
2401 b64encode_urlsafe(buf, (char *)buf, packmsg_output_size(&out, buf));
2406 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2407 if(!mesh || !data) {
2408 meshlink_errno = MESHLINK_EINVAL;
2412 size_t datalen = strlen(data);
2413 uint8_t *buf = xmalloc(datalen);
2414 int buflen = b64decode(data, buf, datalen);
2417 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2418 meshlink_errno = MESHLINK_EPEER;
2422 packmsg_input_t in = {buf, buflen};
2423 uint32_t count = packmsg_get_array(&in);
2426 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2427 meshlink_errno = MESHLINK_EPEER;
2431 pthread_mutex_lock(&(mesh->mesh_mutex));
2435 uint32_t len = packmsg_get_bin_raw(&in, &data);
2441 packmsg_input_t in2 = {data, len};
2442 uint32_t version = packmsg_get_uint32(&in2);
2443 char *name = packmsg_get_str_dup(&in2);
2445 if(!packmsg_input_ok(&in2) || version != MESHLINK_CONFIG_VERSION || !check_id(name)) {
2447 packmsg_input_invalidate(&in2);
2451 if(!check_id(name)) {
2456 node_t *n = lookup_node(mesh, name);
2460 logger(mesh, MESHLINK_DEBUG, "Node %s already exists, not importing\n", name);
2466 char *submesh_name = packmsg_get_str_dup(&in2);
2469 if(!strcmp(submesh_name, CORE_MESH)) {
2472 n->submesh = lookup_or_create_submesh(mesh, submesh_name);
2475 packmsg_input_invalidate(&in2);
2482 n->devclass = packmsg_get_int32(&in2);
2483 n->status.blacklisted = packmsg_get_bool(&in2);
2485 uint32_t keylen = packmsg_get_bin_raw(&in2, &key);
2488 n->ecdsa = ecdsa_set_public_key(key);
2491 n->canonical_address = packmsg_get_str_dup(&in2);
2492 uint32_t count = packmsg_get_array(&in2);
2498 for(uint32_t i = 0; i < count; i++) {
2499 n->recent[i] = packmsg_get_sockaddr(&in2);
2502 if(!packmsg_done(&in2) || keylen != 32) {
2503 packmsg_input_invalidate(&in2);
2506 config_t config = {data, len};
2507 config_write(mesh, n->name, &config);
2512 pthread_mutex_unlock(&(mesh->mesh_mutex));
2514 if(!packmsg_done(&in)) {
2515 logger(mesh, MESHLINK_ERROR, "Invalid data\n");
2516 meshlink_errno = MESHLINK_EPEER;
2523 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2524 if(!mesh || !node) {
2525 meshlink_errno = MESHLINK_EINVAL;
2529 pthread_mutex_lock(&(mesh->mesh_mutex));
2534 if(n == mesh->self) {
2535 logger(mesh, MESHLINK_ERROR, "%s blacklisting itself?\n", node->name);
2536 meshlink_errno = MESHLINK_EINVAL;
2537 pthread_mutex_unlock(&(mesh->mesh_mutex));
2541 if(n->status.blacklisted) {
2542 logger(mesh, MESHLINK_DEBUG, "Node %s already blacklisted\n", node->name);
2543 pthread_mutex_unlock(&(mesh->mesh_mutex));
2547 n->status.blacklisted = true;
2548 n->status.dirty = true;
2549 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2551 //Immediately terminate any connections we have with the blacklisted node
2552 for list_each(connection_t, c, mesh->connections) {
2554 terminate_connection(mesh, c, c->status.active);
2558 utcp_abort_all_connections(n->utcp);
2564 n->status.udp_confirmed = false;
2566 if(n->status.reachable) {
2567 update_node_status(mesh, n);
2570 pthread_mutex_unlock(&(mesh->mesh_mutex));
2573 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2574 if(!mesh || !node) {
2575 meshlink_errno = MESHLINK_EINVAL;
2579 pthread_mutex_lock(&(mesh->mesh_mutex));
2581 node_t *n = (node_t *)node;
2583 if(!n->status.blacklisted) {
2584 logger(mesh, MESHLINK_DEBUG, "Node %s was already whitelisted\n", node->name);
2585 meshlink_errno = MESHLINK_EINVAL;
2586 pthread_mutex_unlock(&(mesh->mesh_mutex));
2590 n->status.blacklisted = false;
2591 n->status.dirty = true;
2593 pthread_mutex_unlock(&(mesh->mesh_mutex));
2597 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2598 mesh->default_blacklist = blacklist;
2601 /* Hint that a hostname may be found at an address
2602 * See header file for detailed comment.
2604 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2605 if(!mesh || !node || !addr) {
2606 meshlink_errno = EINVAL;
2610 pthread_mutex_lock(&(mesh->mesh_mutex));
2612 node_t *n = (node_t *)node;
2613 memmove(n->recent + 1, n->recent, 4 * sizeof(*n->recent));
2614 memcpy(n->recent, addr, SALEN(*addr));
2615 n->status.dirty = true;
2617 pthread_mutex_unlock(&(mesh->mesh_mutex));
2618 // @TODO do we want to fire off a connection attempt right away?
2621 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2623 node_t *n = utcp->priv;
2624 meshlink_handle_t *mesh = n->mesh;
2625 return mesh->channel_accept_cb;
2628 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2629 meshlink_channel_t *channel = connection->priv;
2635 node_t *n = channel->node;
2636 meshlink_handle_t *mesh = n->mesh;
2638 if(n->status.destroyed) {
2639 meshlink_channel_close(mesh, channel);
2640 } else if(channel->receive_cb) {
2641 channel->receive_cb(mesh, channel, data, len);
2647 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2648 node_t *n = utcp_connection->utcp->priv;
2654 meshlink_handle_t *mesh = n->mesh;
2656 if(!mesh->channel_accept_cb) {
2660 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2662 channel->c = utcp_connection;
2664 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2665 utcp_accept(utcp_connection, channel_recv, channel);
2671 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2672 node_t *n = utcp->priv;
2674 if(n->status.destroyed) {
2678 meshlink_handle_t *mesh = n->mesh;
2679 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2682 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2683 if(!mesh || !channel) {
2684 meshlink_errno = MESHLINK_EINVAL;
2688 channel->receive_cb = cb;
2691 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2693 node_t *n = (node_t *)source;
2699 utcp_recv(n->utcp, data, len);
2702 static void channel_poll(struct utcp_connection *connection, size_t len) {
2703 meshlink_channel_t *channel = connection->priv;
2709 node_t *n = channel->node;
2710 meshlink_handle_t *mesh = n->mesh;
2712 if(channel->poll_cb) {
2713 channel->poll_cb(mesh, channel, len);
2717 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2719 channel->poll_cb = cb;
2720 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2723 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2725 meshlink_errno = MESHLINK_EINVAL;
2729 pthread_mutex_lock(&mesh->mesh_mutex);
2730 mesh->channel_accept_cb = cb;
2731 mesh->receive_cb = channel_receive;
2733 for splay_each(node_t, n, mesh->nodes) {
2734 if(!n->utcp && n != mesh->self) {
2735 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2739 pthread_mutex_unlock(&mesh->mesh_mutex);
2742 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) {
2744 abort(); // TODO: handle non-NULL data
2747 if(!mesh || !node) {
2748 meshlink_errno = MESHLINK_EINVAL;
2752 node_t *n = (node_t *)node;
2755 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2756 mesh->receive_cb = channel_receive;
2759 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2764 if(n->status.blacklisted) {
2765 logger(mesh, MESHLINK_ERROR, "Cannot open a channel with blacklisted node\n");
2769 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2771 channel->receive_cb = cb;
2772 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2775 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2783 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) {
2784 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2787 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2788 if(!mesh || !channel) {
2789 meshlink_errno = MESHLINK_EINVAL;
2793 utcp_shutdown(channel->c, direction);
2796 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2797 if(!mesh || !channel) {
2798 meshlink_errno = MESHLINK_EINVAL;
2802 utcp_close(channel->c);
2806 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2807 if(!mesh || !channel) {
2808 meshlink_errno = MESHLINK_EINVAL;
2817 meshlink_errno = MESHLINK_EINVAL;
2821 // TODO: more finegrained locking.
2822 // Ideally we want to put the data into the UTCP connection's send buffer.
2823 // Then, preferably only if there is room in the receiver window,
2824 // kick the meshlink thread to go send packets.
2826 pthread_mutex_lock(&mesh->mesh_mutex);
2827 ssize_t retval = utcp_send(channel->c, data, len);
2828 pthread_mutex_unlock(&mesh->mesh_mutex);
2831 meshlink_errno = MESHLINK_ENETWORK;
2837 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2838 if(!mesh || !channel) {
2839 meshlink_errno = MESHLINK_EINVAL;
2843 return channel->c->flags;
2846 size_t meshlink_channel_get_sendq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2847 if(!mesh || !channel) {
2848 meshlink_errno = MESHLINK_EINVAL;
2852 return utcp_get_sendq(channel->c);
2855 size_t meshlink_channel_get_recvq(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2856 if(!mesh || !channel) {
2857 meshlink_errno = MESHLINK_EINVAL;
2861 return utcp_get_recvq(channel->c);
2864 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2865 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2866 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2869 if(mesh->node_status_cb) {
2870 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable && !n->status.blacklisted);
2874 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
2875 if(!mesh->node_duplicate_cb || n->status.duplicate) {
2879 n->status.duplicate = true;
2880 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
2883 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2887 meshlink_errno = MESHLINK_EINVAL;
2891 pthread_mutex_lock(&mesh->mesh_mutex);
2893 if(mesh->discovery == enable) {
2897 if(mesh->threadstarted) {
2899 discovery_start(mesh);
2901 discovery_stop(mesh);
2905 mesh->discovery = enable;
2908 pthread_mutex_unlock(&mesh->mesh_mutex);
2912 meshlink_errno = MESHLINK_ENOTSUP;
2916 static void __attribute__((constructor)) meshlink_init(void) {
2919 randomize(&seed, sizeof(seed));
2923 static void __attribute__((destructor)) meshlink_exit(void) {
2927 /// Device class traits
2928 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2929 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2930 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2931 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2932 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN