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.
19 #define VAR_SERVER 1 /* Should be in meshlink.conf */
20 #define VAR_HOST 2 /* Can be in host config file */
21 #define VAR_MULTIPLE 4 /* Multiple statements allowed */
22 #define VAR_OBSOLETE 8 /* Should not be used anymore */
23 #define VAR_SAFE 16 /* Variable is safe when accepting invitations */
24 #define MAX_ADDRESS_LENGTH 45 /* Max length of an (IPv6) address */
25 #define MAX_PORT_LENGTH 5 /* 0-65535 */
37 #include "meshlink_internal.h"
45 #include "ed25519/sha512.h"
46 #include "discovery.h"
49 #define MSG_NOSIGNAL 0
52 __thread meshlink_errno_t meshlink_errno;
53 meshlink_log_cb_t global_log_cb;
54 meshlink_log_level_t global_log_level;
56 //TODO: this can go away completely
57 const var_t variables[] = {
58 /* Server configuration */
59 {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
61 /* Host configuration */
62 {"CanonicalAddress", VAR_HOST},
63 {"Address", VAR_HOST | VAR_MULTIPLE},
64 {"ECDSAPublicKey", VAR_HOST},
69 static bool fcopy(FILE *out, const char *filename) {
70 FILE *in = fopen(filename, "r");
73 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
80 while((len = fread(buf, 1, sizeof(buf), in))) {
81 fwrite(buf, len, 1, out);
88 static int rstrip(char *value) {
89 int len = strlen(value);
91 while(len && strchr("\t\r\n ", value[len - 1])) {
98 static void scan_for_canonical_address(const char *filename, char **hostname, char **port) {
101 if(!filename || (*hostname && *port)) {
105 FILE *f = fopen(filename, "r");
111 while(fgets(line, sizeof(line), f)) {
117 p += strcspn(p, "\t =");
123 q = p + strspn(p, "\t ");
126 q += 1 + strspn(q + 1, "\t ");
129 // q is now pointing to the hostname
131 p = q + strcspn(q, "\t ");
137 p += strspn(p, "\t ");
138 p[strcspn(p, "\t ")] = 0;
139 // p is now pointing to the port, if present
141 if(!*port && !strcasecmp(line, "Port")) {
143 } else if(!strcasecmp(line, "CanonicalAddress")) {
144 *hostname = xstrdup(q);
152 if(*hostname && *port) {
160 static bool is_valid_hostname(const char *hostname) {
165 for(const char *p = hostname; *p; p++) {
166 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
174 static bool is_valid_port(const char *port) {
181 unsigned long int result = strtoul(port, &end, 10);
182 return result && result < 65536 && !*end;
185 for(const char *p = port; *p; p++) {
186 if(!(isalnum(*p) || *p == '-')) {
194 static void set_timeout(int sock, int timeout) {
199 tv.tv_sec = timeout / 1000;
200 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
202 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
203 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
206 // Find out what local address a socket would use if we connect to the given address.
207 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
208 // of both endpoints, but this will actually not send any UDP packet.
209 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
210 struct addrinfo *rai = NULL;
211 const struct addrinfo hint = {
212 .ai_family = AF_UNSPEC,
213 .ai_socktype = SOCK_DGRAM,
214 .ai_protocol = IPPROTO_UDP,
217 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
221 int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
228 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
236 struct sockaddr_storage sn;
237 socklen_t sl = sizeof(sn);
239 if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
246 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
253 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
254 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
257 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
258 char *hostname = NULL;
260 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
261 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
262 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
265 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
266 if(family != AF_UNSPEC && aip->ai_family != family) {
270 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
273 set_timeout(s, 5000);
275 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
282 send(s, request, sizeof(request) - 1, 0);
283 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
288 if(line[len - 1] == '\n') {
292 char *p = strrchr(line, '\n');
295 hostname = xstrdup(p + 1);
311 // Check that the hostname is reasonable
312 if(hostname && !is_valid_hostname(hostname)) {
318 meshlink_errno = MESHLINK_ERESOLV;
324 char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
327 // Determine address of the local interface used for outgoing connections.
328 char localaddr[NI_MAXHOST];
329 bool success = false;
331 if(family == AF_INET) {
332 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr));
333 } else if(family == AF_INET6) {
334 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr));
338 meshlink_errno = MESHLINK_ENETWORK;
342 return xstrdup(localaddr);
345 void remove_duplicate_hostnames(char *host[], char *port[], int n) {
346 for(int i = 0; i < n; i++) {
351 // Ignore duplicate hostnames
354 for(int j = 0; j < i; j++) {
359 if(strcmp(host[i], host[j])) {
363 if(strcmp(port[i], port[j])) {
381 // This gets the hostname part for use in invitation URLs
382 static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
383 char *hostname[4] = {NULL};
384 char *port[4] = {NULL};
385 char *hostport = NULL;
387 if(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
388 flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
391 if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
392 flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
395 // Add local addresses if requested
396 if(flags & MESHLINK_INVITE_LOCAL) {
397 if(flags & MESHLINK_INVITE_IPV4) {
398 hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
401 if(flags & MESHLINK_INVITE_IPV6) {
402 hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
406 // Add public/canonical addresses if requested
407 if(flags & MESHLINK_INVITE_PUBLIC) {
408 // Try the CanonicalAddress first
409 char filename[PATH_MAX] = "";
410 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
411 scan_for_canonical_address(filename, &hostname[2], &port[2]);
414 if(flags & MESHLINK_INVITE_IPV4) {
415 hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
418 if(flags & MESHLINK_INVITE_IPV6) {
419 hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
424 for(int i = 0; i < 4; i++) {
425 // Ensure we always have a port number
426 if(hostname[i] && !port[i]) {
427 port[i] = xstrdup(mesh->myport);
431 remove_duplicate_hostnames(hostname, port, 4);
433 if(!(flags & MESHLINK_INVITE_NUMERIC)) {
434 for(int i = 0; i < 4; i++) {
439 // Convert what we have to a sockaddr
440 struct addrinfo *ai_in, *ai_out;
441 struct addrinfo hint = {
442 .ai_family = AF_UNSPEC,
443 .ai_flags = AI_NUMERICSERV,
444 .ai_socktype = SOCK_STREAM,
446 int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
452 // Convert it to a hostname
453 char resolved_host[NI_MAXHOST];
454 char resolved_port[NI_MAXSERV];
455 err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
462 // Convert the hostname back to a sockaddr
463 hint.ai_family = ai_in->ai_family;
464 err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
471 // Check if it's still the same sockaddr
472 if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
474 freeaddrinfo(ai_out);
478 // Yes: replace the hostname with the resolved one
480 hostname[i] = xstrdup(resolved_host);
483 freeaddrinfo(ai_out);
487 // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
488 remove_duplicate_hostnames(hostname, port, 4);
490 // Concatenate all unique address to the hostport string
491 for(int i = 0; i < 4; i++) {
496 // Ensure we have the same addresses in our own host config file.
498 xasprintf(&tmphostport, "%s %s", hostname[i], port[i]);
499 append_config_file(mesh, mesh->self->name, "Address", tmphostport);
502 // Append the address to the hostport string
504 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
506 hostport = newhostport;
515 static char *get_line(const char **data) {
516 if(!data || !*data) {
525 static char line[1024];
526 const char *end = strchr(*data, '\n');
527 size_t len = end ? (size_t)(end - *data) : strlen(*data);
529 if(len >= sizeof(line)) {
530 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
534 if(len && !isprint(**data)) {
538 memcpy(line, *data, len);
550 static char *get_value(const char *data, const char *var) {
551 char *line = get_line(&data);
557 char *sep = line + strcspn(line, " \t=");
558 char *val = sep + strspn(sep, " \t");
561 val += 1 + strspn(val + 1, " \t");
566 if(strcasecmp(line, var)) {
573 static bool try_bind(int port) {
574 struct addrinfo *ai = NULL;
575 struct addrinfo hint = {
576 .ai_flags = AI_PASSIVE,
577 .ai_family = AF_UNSPEC,
578 .ai_socktype = SOCK_STREAM,
579 .ai_protocol = IPPROTO_TCP,
583 snprintf(portstr, sizeof(portstr), "%d", port);
585 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
590 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
597 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
612 int check_port(meshlink_handle_t *mesh) {
613 for(int i = 0; i < 1000; i++) {
614 int port = 0x1000 + (rand() & 0x7fff);
617 char filename[PATH_MAX];
618 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
619 FILE *f = fopen(filename, "a");
622 meshlink_errno = MESHLINK_ESTORAGE;
623 logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n");
627 fprintf(f, "Port = %d\n", port);
633 meshlink_errno = MESHLINK_ENETWORK;
634 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
638 static void deltree(const char *dirname) {
639 DIR *d = opendir(dirname);
644 while((ent = readdir(d))) {
645 if(ent->d_name[0] == '.') {
649 char filename[PATH_MAX];
650 snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
652 if(unlink(filename)) {
663 static bool finalize_join(meshlink_handle_t *mesh) {
664 char *name = xstrdup(get_value(mesh->data, "Name"));
667 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
671 if(!check_id(name)) {
672 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
676 char filename[PATH_MAX];
677 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
679 FILE *f = fopen(filename, "w");
682 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
686 fprintf(f, "Name = %s\n", name);
688 // Wipe all old host config files and invitations
689 snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
692 if(mkdir(filename, 0777) && errno != EEXIST) {
693 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
697 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
700 // Create a new host config file for ourself
701 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
702 FILE *fh = fopen(filename, "w");
705 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
710 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
711 // Other chunks go unfiltered to their respective host config files
712 const char *p = mesh->data;
715 while((l = get_line(&p))) {
721 // Split line into variable and value
722 int len = strcspn(l, "\t =");
724 value += strspn(value, "\t ");
728 value += strspn(value, "\t ");
734 if(!strcasecmp(l, "Name"))
735 if(strcmp(value, name)) {
739 } else if(!strcasecmp(l, "NetName")) {
743 // Check the list of known variables
747 for(i = 0; variables[i].name; i++) {
748 if(strcasecmp(l, variables[i].name)) {
756 // Ignore unknown and unsafe variables
758 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
760 } else if(!(variables[i].type & VAR_SAFE)) {
761 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
765 // Copy the safe variable to the right config file
766 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
771 while(l && !strcasecmp(l, "Name")) {
772 if(!check_id(value)) {
773 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
777 if(!strcmp(value, name)) {
778 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
782 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
783 f = fopen(filename, "w");
786 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
790 while((l = get_line(&p))) {
791 if(!strcmp(l, "#---------------------------------------------------------------#")) {
795 int len = strcspn(l, "\t =");
797 if(len == 4 && !strncasecmp(l, "Name", 4)) {
799 value += strspn(value, "\t ");
803 value += strspn(value, "\t ");
817 char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
824 fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
825 fprintf(fh, "Port = %s\n", mesh->myport);
829 sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
833 free(mesh->self->name);
834 free(mesh->self->connection->name);
835 mesh->name = xstrdup(name);
836 mesh->self->name = xstrdup(name);
837 mesh->self->connection->name = name;
839 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
841 load_all_nodes(mesh);
846 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
848 meshlink_handle_t *mesh = handle;
849 const char *ptr = data;
852 int result = send(mesh->sock, ptr, len, 0);
854 if(result == -1 && errno == EINTR) {
856 } else if(result <= 0) {
867 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
868 meshlink_handle_t *mesh = handle;
871 case SPTPS_HANDSHAKE:
872 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
875 mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
876 memcpy(mesh->data + mesh->thedatalen, msg, len);
877 mesh->thedatalen += len;
878 mesh->data[mesh->thedatalen] = 0;
882 mesh->thedatalen = 0;
883 return finalize_join(mesh);
886 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
887 shutdown(mesh->sock, SHUT_RDWR);
888 mesh->success = true;
898 static bool recvline(meshlink_handle_t *mesh, size_t len) {
899 char *newline = NULL;
905 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
906 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
908 if(result == -1 && errno == EINTR) {
910 } else if(result <= 0) {
914 mesh->blen += result;
917 if((size_t)(newline - mesh->buffer) >= len) {
921 len = newline - mesh->buffer;
923 memcpy(mesh->line, mesh->buffer, len);
925 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
926 mesh->blen -= len + 1;
930 static bool sendline(int fd, char *format, ...) {
931 static char buffer[4096];
936 va_start(ap, format);
937 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
940 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
948 int result = send(fd, p, blen, MSG_NOSIGNAL);
950 if(result == -1 && errno == EINTR) {
952 } else if(result <= 0) {
963 static const char *errstr[] = {
964 [MESHLINK_OK] = "No error",
965 [MESHLINK_EINVAL] = "Invalid argument",
966 [MESHLINK_ENOMEM] = "Out of memory",
967 [MESHLINK_ENOENT] = "No such node",
968 [MESHLINK_EEXIST] = "Node already exists",
969 [MESHLINK_EINTERNAL] = "Internal error",
970 [MESHLINK_ERESOLV] = "Could not resolve hostname",
971 [MESHLINK_ESTORAGE] = "Storage error",
972 [MESHLINK_ENETWORK] = "Network error",
973 [MESHLINK_EPEER] = "Error communicating with peer",
974 [MESHLINK_ENOTSUP] = "Operation not supported",
975 [MESHLINK_EBUSY] = "MeshLink instance already in use",
978 const char *meshlink_strerror(meshlink_errno_t err) {
979 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
980 return "Invalid error code";
986 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
989 char pubname[PATH_MAX], privname[PATH_MAX];
991 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
993 if(!(key = ecdsa_generate())) {
994 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
995 meshlink_errno = MESHLINK_EINTERNAL;
998 logger(mesh, MESHLINK_DEBUG, "Done.\n");
1001 if(snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) {
1002 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase);
1003 meshlink_errno = MESHLINK_ESTORAGE;
1007 f = fopen(privname, "wb");
1010 meshlink_errno = MESHLINK_ESTORAGE;
1015 fchmod(fileno(f), 0600);
1018 if(!ecdsa_write_pem_private_key(key, f)) {
1019 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
1022 meshlink_errno = MESHLINK_EINTERNAL;
1028 snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
1029 f = fopen(pubname, "a");
1032 meshlink_errno = MESHLINK_ESTORAGE;
1036 char *pubkey = ecdsa_get_base64_public_key(key);
1037 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
1046 static struct timeval idle(event_loop_t *loop, void *data) {
1048 meshlink_handle_t *mesh = data;
1049 struct timeval t, tmin = {3600, 0};
1051 for splay_each(node_t, n, mesh->nodes) {
1056 t = utcp_timeout(n->utcp);
1058 if(timercmp(&t, &tmin, <)) {
1066 // Get our local address(es) by simulating connecting to an Internet host.
1067 static void add_local_addresses(meshlink_handle_t *mesh) {
1068 char host[NI_MAXHOST];
1069 char entry[MAX_STRING_SIZE];
1073 if(getlocaladdrname("93.184.216.34", host, sizeof(host))) {
1074 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
1075 append_config_file(mesh, mesh->name, "Address", entry);
1080 if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) {
1081 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
1082 append_config_file(mesh, mesh->name, "Address", entry);
1086 static bool meshlink_setup(meshlink_handle_t *mesh) {
1087 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
1088 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
1089 meshlink_errno = MESHLINK_ESTORAGE;
1093 char filename[PATH_MAX];
1094 snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
1096 if(mkdir(filename, 0777) && errno != EEXIST) {
1097 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1098 meshlink_errno = MESHLINK_ESTORAGE;
1102 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
1104 if(!access(filename, F_OK)) {
1105 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
1106 meshlink_errno = MESHLINK_EEXIST;
1110 FILE *f = fopen(filename, "w");
1113 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
1114 meshlink_errno = MESHLINK_ESTORAGE;
1118 fprintf(f, "Name = %s\n", mesh->name);
1121 if(!ecdsa_keygen(mesh)) {
1122 meshlink_errno = MESHLINK_EINTERNAL;
1127 if(check_port(mesh) == 0) {
1128 meshlink_errno = MESHLINK_ENETWORK;
1136 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1137 // Validate arguments provided by the application
1138 bool usingname = false;
1140 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1142 if(!confbase || !*confbase) {
1143 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1144 meshlink_errno = MESHLINK_EINVAL;
1148 if(!appname || !*appname) {
1149 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1150 meshlink_errno = MESHLINK_EINVAL;
1154 if(strchr(appname, ' ')) {
1155 logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
1156 meshlink_errno = MESHLINK_EINVAL;
1160 if(!name || !*name) {
1161 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1163 } else { //check name only if there is a name != NULL
1165 if(!check_id(name)) {
1166 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1167 meshlink_errno = MESHLINK_EINVAL;
1174 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1175 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1176 meshlink_errno = MESHLINK_EINVAL;
1180 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1181 mesh->confbase = xstrdup(confbase);
1182 mesh->appname = xstrdup(appname);
1183 mesh->devclass = devclass;
1184 mesh->discovery = true;
1185 mesh->invitation_timeout = 604800; // 1 week
1188 mesh->name = xstrdup(name);
1192 pthread_mutexattr_t attr;
1193 pthread_mutexattr_init(&attr);
1194 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1195 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1197 mesh->threadstarted = false;
1198 event_loop_init(&mesh->loop);
1199 mesh->loop.data = mesh;
1201 meshlink_queue_init(&mesh->outpacketqueue);
1203 // Check whether meshlink.conf already exists
1205 char filename[PATH_MAX];
1206 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1208 if(access(filename, R_OK)) {
1209 if(errno == ENOENT) {
1210 // If not, create it
1211 if(!meshlink_setup(mesh)) {
1212 // meshlink_errno is set by meshlink_setup()
1216 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
1217 meshlink_close(mesh);
1218 meshlink_errno = MESHLINK_ESTORAGE;
1223 // Open the configuration file and lock it
1225 mesh->conffile = fopen(filename, "r");
1227 if(!mesh->conffile) {
1228 logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", filename, strerror(errno));
1229 meshlink_close(mesh);
1230 meshlink_errno = MESHLINK_ESTORAGE;
1235 fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC);
1239 // TODO: use _locking()?
1242 if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) {
1243 logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", filename, strerror(errno));
1244 meshlink_close(mesh);
1245 meshlink_errno = MESHLINK_EBUSY;
1251 // Read the configuration
1253 init_configuration(&mesh->config);
1255 if(!read_server_config(mesh)) {
1256 meshlink_close(mesh);
1257 meshlink_errno = MESHLINK_ESTORAGE;
1262 struct WSAData wsa_state;
1264 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1268 // Setup up everything
1269 // TODO: we should not open listening sockets yet
1271 if(!setup_network(mesh)) {
1272 meshlink_close(mesh);
1273 meshlink_errno = MESHLINK_ENETWORK;
1277 add_local_addresses(mesh);
1279 idle_set(&mesh->loop, idle, mesh);
1281 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1285 static void *meshlink_main_loop(void *arg) {
1286 meshlink_handle_t *mesh = arg;
1288 pthread_mutex_lock(&(mesh->mesh_mutex));
1290 try_outgoing_connections(mesh);
1292 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1294 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1296 pthread_mutex_unlock(&(mesh->mesh_mutex));
1300 bool meshlink_start(meshlink_handle_t *mesh) {
1302 meshlink_errno = MESHLINK_EINVAL;
1306 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1308 pthread_mutex_lock(&(mesh->mesh_mutex));
1310 if(mesh->threadstarted) {
1311 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1312 pthread_mutex_unlock(&(mesh->mesh_mutex));
1316 if(mesh->listen_socket[0].tcp.fd < 0) {
1317 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1318 meshlink_errno = MESHLINK_ENETWORK;
1322 mesh->thedatalen = 0;
1324 // TODO: open listening sockets first
1326 //Check that a valid name is set
1328 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1329 meshlink_errno = MESHLINK_EINVAL;
1330 pthread_mutex_unlock(&(mesh->mesh_mutex));
1334 // Start the main thread
1336 event_loop_start(&mesh->loop);
1338 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1339 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1340 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1341 meshlink_errno = MESHLINK_EINTERNAL;
1342 event_loop_stop(&mesh->loop);
1343 pthread_mutex_unlock(&(mesh->mesh_mutex));
1347 mesh->threadstarted = true;
1351 if(mesh->discovery) {
1352 discovery_start(mesh);
1357 pthread_mutex_unlock(&(mesh->mesh_mutex));
1361 void meshlink_stop(meshlink_handle_t *mesh) {
1363 meshlink_errno = MESHLINK_EINVAL;
1367 pthread_mutex_lock(&(mesh->mesh_mutex));
1368 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1373 if(mesh->discovery) {
1374 discovery_stop(mesh);
1379 // Shut down the main thread
1380 event_loop_stop(&mesh->loop);
1382 // Send ourselves a UDP packet to kick the event loop
1383 for(int i = 0; i < mesh->listen_sockets; i++) {
1385 socklen_t salen = sizeof(sa.sa);
1387 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1388 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1392 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1393 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1397 if(mesh->threadstarted) {
1398 // Wait for the main thread to finish
1399 pthread_mutex_unlock(&(mesh->mesh_mutex));
1400 pthread_join(mesh->thread, NULL);
1401 pthread_mutex_lock(&(mesh->mesh_mutex));
1403 mesh->threadstarted = false;
1406 // Close all metaconnections
1407 if(mesh->connections) {
1408 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1410 connection_t *c = node->data;
1412 terminate_connection(mesh, c, false);
1416 if(mesh->outgoings) {
1417 list_delete_list(mesh->outgoings);
1418 mesh->outgoings = NULL;
1421 pthread_mutex_unlock(&(mesh->mesh_mutex));
1424 void meshlink_close(meshlink_handle_t *mesh) {
1425 if(!mesh || !mesh->confbase) {
1426 meshlink_errno = MESHLINK_EINVAL;
1430 // stop can be called even if mesh has not been started
1431 meshlink_stop(mesh);
1433 // lock is not released after this
1434 pthread_mutex_lock(&(mesh->mesh_mutex));
1436 // Close and free all resources used.
1438 close_network_connections(mesh);
1440 logger(mesh, MESHLINK_INFO, "Terminating");
1442 exit_configuration(&mesh->config);
1443 event_loop_exit(&mesh->loop);
1447 if(mesh->confbase) {
1453 ecdsa_free(mesh->invitation_key);
1456 free(mesh->appname);
1457 free(mesh->confbase);
1458 pthread_mutex_destroy(&(mesh->mesh_mutex));
1460 if(mesh->conffile) {
1461 fclose(mesh->conffile);
1464 memset(mesh, 0, sizeof(*mesh));
1469 bool meshlink_destroy(const char *confbase) {
1471 meshlink_errno = MESHLINK_EINVAL;
1475 char filename[PATH_MAX];
1476 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1478 if(unlink(filename)) {
1479 if(errno == ENOENT) {
1480 meshlink_errno = MESHLINK_ENOENT;
1483 logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
1484 meshlink_errno = MESHLINK_ESTORAGE;
1494 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1496 meshlink_errno = MESHLINK_EINVAL;
1500 pthread_mutex_lock(&(mesh->mesh_mutex));
1501 mesh->receive_cb = cb;
1502 pthread_mutex_unlock(&(mesh->mesh_mutex));
1505 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1507 meshlink_errno = MESHLINK_EINVAL;
1511 pthread_mutex_lock(&(mesh->mesh_mutex));
1512 mesh->node_status_cb = cb;
1513 pthread_mutex_unlock(&(mesh->mesh_mutex));
1516 void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
1518 meshlink_errno = MESHLINK_EINVAL;
1522 pthread_mutex_lock(&(mesh->mesh_mutex));
1523 mesh->node_duplicate_cb = cb;
1524 pthread_mutex_unlock(&(mesh->mesh_mutex));
1527 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1529 pthread_mutex_lock(&(mesh->mesh_mutex));
1531 mesh->log_level = cb ? level : 0;
1532 pthread_mutex_unlock(&(mesh->mesh_mutex));
1535 global_log_level = cb ? level : 0;
1539 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1540 meshlink_packethdr_t *hdr;
1542 // Validate arguments
1543 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1544 meshlink_errno = MESHLINK_EINVAL;
1553 meshlink_errno = MESHLINK_EINVAL;
1557 // Prepare the packet
1558 vpn_packet_t *packet = malloc(sizeof(*packet));
1561 meshlink_errno = MESHLINK_ENOMEM;
1565 packet->probe = false;
1566 packet->tcp = false;
1567 packet->len = len + sizeof(*hdr);
1569 hdr = (meshlink_packethdr_t *)packet->data;
1570 memset(hdr, 0, sizeof(*hdr));
1571 // leave the last byte as 0 to make sure strings are always
1572 // null-terminated if they are longer than the buffer
1573 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1574 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1576 memcpy(packet->data + sizeof(*hdr), data, len);
1579 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1581 meshlink_errno = MESHLINK_ENOMEM;
1585 // Notify event loop
1586 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1591 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1593 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1599 mesh->self->in_packets++;
1600 mesh->self->in_bytes += packet->len;
1601 route(mesh, mesh->self, packet);
1604 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1605 if(!mesh || !destination) {
1606 meshlink_errno = MESHLINK_EINVAL;
1610 pthread_mutex_lock(&(mesh->mesh_mutex));
1612 node_t *n = (node_t *)destination;
1614 if(!n->status.reachable) {
1615 pthread_mutex_unlock(&(mesh->mesh_mutex));
1618 } else if(n->mtuprobes > 30 && n->minmtu) {
1619 pthread_mutex_unlock(&(mesh->mesh_mutex));
1622 pthread_mutex_unlock(&(mesh->mesh_mutex));
1627 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1628 if(!mesh || !node) {
1629 meshlink_errno = MESHLINK_EINVAL;
1633 pthread_mutex_lock(&(mesh->mesh_mutex));
1635 node_t *n = (node_t *)node;
1637 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1638 meshlink_errno = MESHLINK_EINTERNAL;
1639 pthread_mutex_unlock(&(mesh->mesh_mutex));
1643 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1646 meshlink_errno = MESHLINK_EINTERNAL;
1649 pthread_mutex_unlock(&(mesh->mesh_mutex));
1653 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1655 meshlink_errno = MESHLINK_EINVAL;
1659 return (meshlink_node_t *)mesh->self;
1662 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1663 if(!mesh || !name) {
1664 meshlink_errno = MESHLINK_EINVAL;
1668 meshlink_node_t *node = NULL;
1670 pthread_mutex_lock(&(mesh->mesh_mutex));
1671 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1672 pthread_mutex_unlock(&(mesh->mesh_mutex));
1676 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1677 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1678 meshlink_errno = MESHLINK_EINVAL;
1682 meshlink_node_t **result;
1685 pthread_mutex_lock(&(mesh->mesh_mutex));
1687 *nmemb = mesh->nodes->count;
1688 result = realloc(nodes, *nmemb * sizeof(*nodes));
1691 meshlink_node_t **p = result;
1693 for splay_each(node_t, n, mesh->nodes) {
1694 *p++ = (meshlink_node_t *)n;
1699 meshlink_errno = MESHLINK_ENOMEM;
1702 pthread_mutex_unlock(&(mesh->mesh_mutex));
1707 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1708 if(!mesh || !data || !len || !signature || !siglen) {
1709 meshlink_errno = MESHLINK_EINVAL;
1713 if(*siglen < MESHLINK_SIGLEN) {
1714 meshlink_errno = MESHLINK_EINVAL;
1718 pthread_mutex_lock(&(mesh->mesh_mutex));
1720 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1721 meshlink_errno = MESHLINK_EINTERNAL;
1722 pthread_mutex_unlock(&(mesh->mesh_mutex));
1726 *siglen = MESHLINK_SIGLEN;
1727 pthread_mutex_unlock(&(mesh->mesh_mutex));
1731 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1732 if(!mesh || !data || !len || !signature) {
1733 meshlink_errno = MESHLINK_EINVAL;
1737 if(siglen != MESHLINK_SIGLEN) {
1738 meshlink_errno = MESHLINK_EINVAL;
1742 pthread_mutex_lock(&(mesh->mesh_mutex));
1746 struct node_t *n = (struct node_t *)source;
1747 node_read_ecdsa_public_key(mesh, n);
1750 meshlink_errno = MESHLINK_EINTERNAL;
1753 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1756 pthread_mutex_unlock(&(mesh->mesh_mutex));
1760 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1761 char filename[PATH_MAX];
1763 pthread_mutex_lock(&(mesh->mesh_mutex));
1765 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
1767 if(mkdir(filename, 0700) && errno != EEXIST) {
1768 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1769 meshlink_errno = MESHLINK_ESTORAGE;
1770 pthread_mutex_unlock(&(mesh->mesh_mutex));
1774 // Count the number of valid invitations, clean up old ones
1775 DIR *dir = opendir(filename);
1778 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1779 meshlink_errno = MESHLINK_ESTORAGE;
1780 pthread_mutex_unlock(&(mesh->mesh_mutex));
1787 time_t deadline = time(NULL) - 604800; // 1 week in the past
1789 while((ent = readdir(dir))) {
1790 if(strlen(ent->d_name) != 24) {
1794 char invname[PATH_MAX];
1797 if(snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) {
1798 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name);
1802 if(!stat(invname, &st)) {
1803 if(mesh->invitation_key && deadline < st.st_mtime) {
1809 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1815 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1817 meshlink_errno = MESHLINK_ESTORAGE;
1818 pthread_mutex_unlock(&(mesh->mesh_mutex));
1824 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1826 // Remove the key if there are no outstanding invitations.
1830 if(mesh->invitation_key) {
1831 ecdsa_free(mesh->invitation_key);
1832 mesh->invitation_key = NULL;
1836 if(mesh->invitation_key) {
1837 pthread_mutex_unlock(&(mesh->mesh_mutex));
1841 // Create a new key if necessary.
1842 FILE *f = fopen(filename, "rb");
1845 if(errno != ENOENT) {
1846 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1847 meshlink_errno = MESHLINK_ESTORAGE;
1848 pthread_mutex_unlock(&(mesh->mesh_mutex));
1852 mesh->invitation_key = ecdsa_generate();
1854 if(!mesh->invitation_key) {
1855 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1856 meshlink_errno = MESHLINK_EINTERNAL;
1857 pthread_mutex_unlock(&(mesh->mesh_mutex));
1861 f = fopen(filename, "wb");
1864 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1865 meshlink_errno = MESHLINK_ESTORAGE;
1866 pthread_mutex_unlock(&(mesh->mesh_mutex));
1870 chmod(filename, 0600);
1871 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1874 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1877 if(!mesh->invitation_key) {
1878 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1879 meshlink_errno = MESHLINK_ESTORAGE;
1883 pthread_mutex_unlock(&(mesh->mesh_mutex));
1884 return mesh->invitation_key;
1887 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1888 if(!mesh || !node || !address) {
1889 meshlink_errno = MESHLINK_EINVAL;
1893 if(!is_valid_hostname(address)) {
1894 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1895 meshlink_errno = MESHLINK_EINVAL;
1899 if(port && !is_valid_port(port)) {
1900 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1901 meshlink_errno = MESHLINK_EINVAL;
1905 char *canonical_address;
1908 xasprintf(&canonical_address, "%s %s", address, port);
1910 canonical_address = xstrdup(address);
1913 pthread_mutex_lock(&(mesh->mesh_mutex));
1914 bool rval = modify_config_file(mesh, node->name, "CanonicalAddress", canonical_address, 1);
1915 pthread_mutex_unlock(&(mesh->mesh_mutex));
1917 free(canonical_address);
1921 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1922 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
1925 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1927 meshlink_errno = MESHLINK_EINVAL;
1931 char *address = meshlink_get_external_address(mesh);
1939 pthread_mutex_lock(&(mesh->mesh_mutex));
1940 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1941 pthread_mutex_unlock(&(mesh->mesh_mutex));
1947 int meshlink_get_port(meshlink_handle_t *mesh) {
1949 meshlink_errno = MESHLINK_EINVAL;
1954 meshlink_errno = MESHLINK_EINTERNAL;
1958 return atoi(mesh->myport);
1961 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1962 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1963 meshlink_errno = MESHLINK_EINVAL;
1967 if(mesh->myport && port == atoi(mesh->myport)) {
1971 if(!try_bind(port)) {
1972 meshlink_errno = MESHLINK_ENETWORK;
1978 pthread_mutex_lock(&(mesh->mesh_mutex));
1980 if(mesh->threadstarted) {
1981 meshlink_errno = MESHLINK_EINVAL;
1985 close_network_connections(mesh);
1986 exit_configuration(&mesh->config);
1989 snprintf(portstr, sizeof(portstr), "%d", port);
1990 portstr[sizeof(portstr) - 1] = 0;
1992 modify_config_file(mesh, mesh->name, "Port", portstr, true);
1994 init_configuration(&mesh->config);
1996 if(!read_server_config(mesh)) {
1997 meshlink_errno = MESHLINK_ESTORAGE;
1998 } else if(!setup_network(mesh)) {
1999 meshlink_errno = MESHLINK_ENETWORK;
2005 pthread_mutex_unlock(&(mesh->mesh_mutex));
2010 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
2011 mesh->invitation_timeout = timeout;
2014 char *meshlink_invite_ex(meshlink_handle_t *mesh, const char *name, uint32_t flags) {
2016 meshlink_errno = MESHLINK_EINVAL;
2020 pthread_mutex_lock(&(mesh->mesh_mutex));
2022 // Check validity of the new node's name
2023 if(!check_id(name)) {
2024 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
2025 meshlink_errno = MESHLINK_EINVAL;
2026 pthread_mutex_unlock(&(mesh->mesh_mutex));
2030 // Ensure no host configuration file with that name exists
2031 char filename[PATH_MAX];
2032 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
2034 if(!access(filename, F_OK)) {
2035 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
2036 meshlink_errno = MESHLINK_EEXIST;
2037 pthread_mutex_unlock(&(mesh->mesh_mutex));
2041 // Ensure no other nodes know about this name
2042 if(meshlink_get_node(mesh, name)) {
2043 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
2044 meshlink_errno = MESHLINK_EEXIST;
2045 pthread_mutex_unlock(&(mesh->mesh_mutex));
2049 // Get the local address
2050 char *address = get_my_hostname(mesh, flags);
2053 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
2054 meshlink_errno = MESHLINK_ERESOLV;
2055 pthread_mutex_unlock(&(mesh->mesh_mutex));
2059 if(!refresh_invitation_key(mesh)) {
2060 meshlink_errno = MESHLINK_EINTERNAL;
2061 pthread_mutex_unlock(&(mesh->mesh_mutex));
2067 // Create a hash of the key.
2068 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
2069 sha512(fingerprint, strlen(fingerprint), hash);
2070 b64encode_urlsafe(hash, hash, 18);
2072 // Create a random cookie for this invitation.
2074 randomize(cookie, 18);
2076 // Create a filename that doesn't reveal the cookie itself
2077 char buf[18 + strlen(fingerprint)];
2078 char cookiehash[64];
2079 memcpy(buf, cookie, 18);
2080 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
2081 sha512(buf, sizeof(buf), cookiehash);
2082 b64encode_urlsafe(cookiehash, cookiehash, 18);
2084 b64encode_urlsafe(cookie, cookie, 18);
2088 // Create a file containing the details of the invitation.
2089 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
2090 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
2093 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
2094 meshlink_errno = MESHLINK_ESTORAGE;
2095 pthread_mutex_unlock(&(mesh->mesh_mutex));
2099 FILE *f = fdopen(ifd, "w");
2105 // Fill in the details.
2106 fprintf(f, "Name = %s\n", name);
2107 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
2109 // Copy Broadcast and Mode
2110 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
2111 FILE *tc = fopen(filename, "r");
2116 while(fgets(buf, sizeof(buf), tc)) {
2117 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
2118 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
2121 // Make sure there is a newline character.
2122 if(!strchr(buf, '\n')) {
2130 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
2131 meshlink_errno = MESHLINK_ESTORAGE;
2132 pthread_mutex_unlock(&(mesh->mesh_mutex));
2136 fprintf(f, "#---------------------------------------------------------------#\n");
2137 fprintf(f, "Name = %s\n", mesh->self->name);
2139 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
2143 // Create an URL from the local address, key hash and cookie
2145 xasprintf(&url, "%s/%s%s", address, hash, cookie);
2148 pthread_mutex_unlock(&(mesh->mesh_mutex));
2152 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
2153 return meshlink_invite_ex(mesh, name, 0);
2156 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
2157 if(!mesh || !invitation) {
2158 meshlink_errno = MESHLINK_EINVAL;
2162 pthread_mutex_lock(&(mesh->mesh_mutex));
2164 //Before doing meshlink_join make sure we are not connected to another mesh
2165 if(mesh->threadstarted) {
2166 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2167 meshlink_errno = MESHLINK_EINVAL;
2168 pthread_mutex_unlock(&(mesh->mesh_mutex));
2172 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2173 char copy[strlen(invitation) + 1];
2174 strcpy(copy, invitation);
2176 // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
2178 char *slash = strchr(copy, '/');
2186 if(strlen(slash) != 48) {
2190 char *address = copy;
2193 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2197 // Generate a throw-away key for the invitation.
2198 ecdsa_t *key = ecdsa_generate();
2201 meshlink_errno = MESHLINK_EINTERNAL;
2202 pthread_mutex_unlock(&(mesh->mesh_mutex));
2206 char *b64key = ecdsa_get_base64_public_key(key);
2210 while(address && *address) {
2211 // We allow commas in the address part to support multiple addresses in one invitation URL.
2212 comma = strchr(address, ',');
2218 // Split of the port
2219 port = strrchr(address, ':');
2227 // IPv6 address are enclosed in brackets, per RFC 3986
2228 if(*address == '[') {
2230 char *bracket = strchr(address, ']');
2243 // Connect to the meshlink daemon mentioned in the URL.
2244 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2247 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2248 mesh->sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
2250 if(mesh->sock == -1) {
2251 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2252 meshlink_errno = MESHLINK_ENETWORK;
2256 set_timeout(mesh->sock, 5000);
2258 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2259 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2260 meshlink_errno = MESHLINK_ENETWORK;
2261 closesocket(mesh->sock);
2269 meshlink_errno = MESHLINK_ERESOLV;
2272 if(mesh->sock != -1 || !comma) {
2279 if(mesh->sock == -1) {
2280 pthread_mutex_unlock(&mesh->mesh_mutex);
2284 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2286 // Tell him we have an invitation, and give him our throw-away key.
2290 if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, 1, mesh->appname)) {
2291 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2292 closesocket(mesh->sock);
2293 meshlink_errno = MESHLINK_ENETWORK;
2294 pthread_mutex_unlock(&(mesh->mesh_mutex));
2300 char hisname[4096] = "";
2301 int code, hismajor, hisminor = 0;
2303 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) {
2304 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2305 closesocket(mesh->sock);
2306 meshlink_errno = MESHLINK_ENETWORK;
2307 pthread_mutex_unlock(&(mesh->mesh_mutex));
2311 // Check if the hash of the key he gave us matches the hash in the URL.
2312 char *fingerprint = mesh->line + 2;
2315 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2316 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2317 meshlink_errno = MESHLINK_EINTERNAL;
2318 pthread_mutex_unlock(&(mesh->mesh_mutex));
2322 if(memcmp(hishash, mesh->hash, 18)) {
2323 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2324 meshlink_errno = MESHLINK_EPEER;
2325 pthread_mutex_unlock(&(mesh->mesh_mutex));
2330 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2333 meshlink_errno = MESHLINK_EINTERNAL;
2334 pthread_mutex_unlock(&(mesh->mesh_mutex));
2338 // Start an SPTPS session
2339 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2340 meshlink_errno = MESHLINK_EINTERNAL;
2341 pthread_mutex_unlock(&(mesh->mesh_mutex));
2345 // Feed rest of input buffer to SPTPS
2346 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2347 meshlink_errno = MESHLINK_EPEER;
2348 pthread_mutex_unlock(&(mesh->mesh_mutex));
2354 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2356 if(errno == EINTR) {
2360 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2361 meshlink_errno = MESHLINK_ENETWORK;
2362 pthread_mutex_unlock(&(mesh->mesh_mutex));
2366 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2367 meshlink_errno = MESHLINK_EPEER;
2368 pthread_mutex_unlock(&(mesh->mesh_mutex));
2373 sptps_stop(&mesh->sptps);
2376 closesocket(mesh->sock);
2378 if(!mesh->success) {
2379 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2380 meshlink_errno = MESHLINK_EPEER;
2381 pthread_mutex_unlock(&(mesh->mesh_mutex));
2385 pthread_mutex_unlock(&(mesh->mesh_mutex));
2389 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2390 meshlink_errno = MESHLINK_EINVAL;
2391 pthread_mutex_unlock(&(mesh->mesh_mutex));
2395 char *meshlink_export(meshlink_handle_t *mesh) {
2397 meshlink_errno = MESHLINK_EINVAL;
2401 pthread_mutex_lock(&(mesh->mesh_mutex));
2403 char filename[PATH_MAX];
2404 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
2405 FILE *f = fopen(filename, "r");
2408 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
2409 meshlink_errno = MESHLINK_ESTORAGE;
2410 pthread_mutex_unlock(&(mesh->mesh_mutex));
2414 fseek(f, 0, SEEK_END);
2415 int fsize = ftell(f);
2418 size_t len = fsize + 9 + strlen(mesh->self->name);
2419 char *buf = xmalloc(len);
2420 snprintf(buf, len, "Name = %s\n", mesh->self->name);
2422 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
2423 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
2426 meshlink_errno = MESHLINK_ESTORAGE;
2427 pthread_mutex_unlock(&(mesh->mesh_mutex));
2434 pthread_mutex_unlock(&(mesh->mesh_mutex));
2438 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2439 if(!mesh || !data) {
2440 meshlink_errno = MESHLINK_EINVAL;
2444 pthread_mutex_lock(&(mesh->mesh_mutex));
2446 if(strncmp(data, "Name = ", 7)) {
2447 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2448 meshlink_errno = MESHLINK_EPEER;
2449 pthread_mutex_unlock(&(mesh->mesh_mutex));
2453 char *end = strchr(data + 7, '\n');
2456 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2457 meshlink_errno = MESHLINK_EPEER;
2458 pthread_mutex_unlock(&(mesh->mesh_mutex));
2462 int len = end - (data + 7);
2464 memcpy(name, data + 7, len);
2467 if(!check_id(name)) {
2468 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
2469 meshlink_errno = MESHLINK_EPEER;
2470 pthread_mutex_unlock(&(mesh->mesh_mutex));
2474 char filename[PATH_MAX];
2475 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
2477 if(!access(filename, F_OK)) {
2478 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
2479 meshlink_errno = MESHLINK_EEXIST;
2480 pthread_mutex_unlock(&(mesh->mesh_mutex));
2484 if(errno != ENOENT) {
2485 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
2486 meshlink_errno = MESHLINK_ESTORAGE;
2487 pthread_mutex_unlock(&(mesh->mesh_mutex));
2491 FILE *f = fopen(filename, "w");
2494 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
2495 meshlink_errno = MESHLINK_ESTORAGE;
2496 pthread_mutex_unlock(&(mesh->mesh_mutex));
2500 fwrite(end + 1, strlen(end + 1), 1, f);
2503 load_all_nodes(mesh);
2505 pthread_mutex_unlock(&(mesh->mesh_mutex));
2509 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2510 if(!mesh || !node) {
2511 meshlink_errno = MESHLINK_EINVAL;
2515 pthread_mutex_lock(&(mesh->mesh_mutex));
2519 n->status.blacklisted = true;
2520 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2522 //Make blacklisting persistent in the config file
2523 append_config_file(mesh, n->name, "blacklisted", "yes");
2525 //Immediately terminate any connections we have with the blacklisted node
2526 for list_each(connection_t, c, mesh->connections) {
2528 terminate_connection(mesh, c, c->status.active);
2532 pthread_mutex_unlock(&(mesh->mesh_mutex));
2535 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2536 if(!mesh || !node) {
2537 meshlink_errno = MESHLINK_EINVAL;
2541 pthread_mutex_lock(&(mesh->mesh_mutex));
2543 node_t *n = (node_t *)node;
2544 n->status.blacklisted = false;
2546 //TODO: remove blacklisted = yes from the config file
2548 pthread_mutex_unlock(&(mesh->mesh_mutex));
2552 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2553 mesh->default_blacklist = blacklist;
2556 /* Hint that a hostname may be found at an address
2557 * See header file for detailed comment.
2559 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2560 if(!mesh || !node || !addr) {
2564 // Ignore hints about ourself.
2565 if((node_t *)node == mesh->self) {
2569 pthread_mutex_lock(&(mesh->mesh_mutex));
2571 char *host = NULL, *port = NULL, *str = NULL;
2572 sockaddr2str((const sockaddr_t *)addr, &host, &port);
2575 xasprintf(&str, "%s %s", host, port);
2577 if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0)) {
2578 modify_config_file(mesh, node->name, "Address", str, 5);
2580 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
2588 pthread_mutex_unlock(&(mesh->mesh_mutex));
2589 // @TODO do we want to fire off a connection attempt right away?
2592 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2594 node_t *n = utcp->priv;
2595 meshlink_handle_t *mesh = n->mesh;
2596 return mesh->channel_accept_cb;
2599 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2600 meshlink_channel_t *channel = connection->priv;
2606 node_t *n = channel->node;
2607 meshlink_handle_t *mesh = n->mesh;
2609 if(n->status.destroyed) {
2610 meshlink_channel_close(mesh, channel);
2611 } else if(channel->receive_cb) {
2612 channel->receive_cb(mesh, channel, data, len);
2618 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2619 node_t *n = utcp_connection->utcp->priv;
2625 meshlink_handle_t *mesh = n->mesh;
2627 if(!mesh->channel_accept_cb) {
2631 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2633 channel->c = utcp_connection;
2635 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2636 utcp_accept(utcp_connection, channel_recv, channel);
2642 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2643 node_t *n = utcp->priv;
2645 if(n->status.destroyed) {
2649 meshlink_handle_t *mesh = n->mesh;
2650 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2653 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2654 if(!mesh || !channel) {
2655 meshlink_errno = MESHLINK_EINVAL;
2659 channel->receive_cb = cb;
2662 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2664 node_t *n = (node_t *)source;
2670 utcp_recv(n->utcp, data, len);
2673 static void channel_poll(struct utcp_connection *connection, size_t len) {
2674 meshlink_channel_t *channel = connection->priv;
2680 node_t *n = channel->node;
2681 meshlink_handle_t *mesh = n->mesh;
2683 if(channel->poll_cb) {
2684 channel->poll_cb(mesh, channel, len);
2688 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2690 channel->poll_cb = cb;
2691 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2694 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2696 meshlink_errno = MESHLINK_EINVAL;
2700 pthread_mutex_lock(&mesh->mesh_mutex);
2701 mesh->channel_accept_cb = cb;
2702 mesh->receive_cb = channel_receive;
2704 for splay_each(node_t, n, mesh->nodes) {
2705 if(!n->utcp && n != mesh->self) {
2706 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2710 pthread_mutex_unlock(&mesh->mesh_mutex);
2713 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) {
2715 abort(); // TODO: handle non-NULL data
2718 if(!mesh || !node) {
2719 meshlink_errno = MESHLINK_EINVAL;
2723 node_t *n = (node_t *)node;
2726 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2727 mesh->receive_cb = channel_receive;
2730 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2735 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2737 channel->receive_cb = cb;
2738 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2741 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2749 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) {
2750 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2753 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2754 if(!mesh || !channel) {
2755 meshlink_errno = MESHLINK_EINVAL;
2759 utcp_shutdown(channel->c, direction);
2762 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2763 if(!mesh || !channel) {
2764 meshlink_errno = MESHLINK_EINVAL;
2768 utcp_close(channel->c);
2772 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2773 if(!mesh || !channel) {
2774 meshlink_errno = MESHLINK_EINVAL;
2783 meshlink_errno = MESHLINK_EINVAL;
2787 // TODO: more finegrained locking.
2788 // Ideally we want to put the data into the UTCP connection's send buffer.
2789 // Then, preferrably only if there is room in the receiver window,
2790 // kick the meshlink thread to go send packets.
2792 pthread_mutex_lock(&mesh->mesh_mutex);
2793 ssize_t retval = utcp_send(channel->c, data, len);
2794 pthread_mutex_unlock(&mesh->mesh_mutex);
2797 meshlink_errno = MESHLINK_ENETWORK;
2803 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2804 if(!mesh || !channel) {
2805 meshlink_errno = MESHLINK_EINVAL;
2809 return channel->c->flags;
2812 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2813 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2814 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2817 if(mesh->node_status_cb) {
2818 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2822 void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
2823 if(!mesh->node_duplicate_cb || n->status.duplicate) {
2827 n->status.duplicate = true;
2828 mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
2831 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2835 meshlink_errno = MESHLINK_EINVAL;
2839 pthread_mutex_lock(&mesh->mesh_mutex);
2841 if(mesh->discovery == enable) {
2845 if(mesh->threadstarted) {
2847 discovery_start(mesh);
2849 discovery_stop(mesh);
2853 mesh->discovery = enable;
2856 pthread_mutex_unlock(&mesh->mesh_mutex);
2860 meshlink_errno = MESHLINK_ENOTSUP;
2864 static void __attribute__((constructor)) meshlink_init(void) {
2867 randomize(&seed, sizeof(seed));
2871 static void __attribute__((destructor)) meshlink_exit(void) {
2875 /// Device class traits
2876 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2877 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2878 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2879 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2880 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN