2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014 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"
44 #include "ed25519/sha512.h"
45 #include "discovery.h"
48 #define MSG_NOSIGNAL 0
51 static pthread_mutex_t global_mutex;
53 __thread meshlink_errno_t meshlink_errno;
54 meshlink_log_cb_t global_log_cb;
55 meshlink_log_level_t global_log_level;
57 //TODO: this can go away completely
58 const var_t variables[] = {
59 /* Server configuration */
60 {"AddressFamily", VAR_SERVER},
61 {"AutoConnect", VAR_SERVER | VAR_SAFE},
62 {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
63 {"BindToInterface", VAR_SERVER},
64 {"Broadcast", VAR_SERVER | VAR_SAFE},
65 {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
66 {"DecrementTTL", VAR_SERVER},
67 {"Device", VAR_SERVER},
68 {"DeviceType", VAR_SERVER},
69 {"DirectOnly", VAR_SERVER},
70 {"ECDSAPrivateKeyFile", VAR_SERVER},
71 {"ExperimentalProtocol", VAR_SERVER},
72 {"Forwarding", VAR_SERVER},
73 {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
74 {"Hostnames", VAR_SERVER},
75 {"IffOneQueue", VAR_SERVER},
76 {"Interface", VAR_SERVER},
77 {"KeyExpire", VAR_SERVER},
78 {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
79 {"LocalDiscovery", VAR_SERVER},
80 {"MACExpire", VAR_SERVER},
81 {"MaxConnectionBurst", VAR_SERVER},
82 {"MaxOutputBufferSize", VAR_SERVER},
83 {"MaxTimeout", VAR_SERVER},
84 {"Mode", VAR_SERVER | VAR_SAFE},
86 {"PingInterval", VAR_SERVER},
87 {"PingTimeout", VAR_SERVER},
88 {"PriorityInheritance", VAR_SERVER},
89 {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
90 {"PrivateKeyFile", VAR_SERVER},
91 {"ProcessPriority", VAR_SERVER},
92 {"Proxy", VAR_SERVER},
93 {"ReplayWindow", VAR_SERVER},
94 {"ScriptsExtension", VAR_SERVER},
95 {"ScriptsInterpreter", VAR_SERVER},
96 {"StrictSubnets", VAR_SERVER},
97 {"TunnelServer", VAR_SERVER},
98 {"VDEGroup", VAR_SERVER},
99 {"VDEPort", VAR_SERVER},
100 /* Host configuration */
101 {"Address", VAR_HOST | VAR_MULTIPLE},
102 {"Cipher", VAR_SERVER | VAR_HOST},
103 {"ClampMSS", VAR_SERVER | VAR_HOST},
104 {"Compression", VAR_SERVER | VAR_HOST},
105 {"Digest", VAR_SERVER | VAR_HOST},
106 {"ECDSAPublicKey", VAR_HOST},
107 {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
108 {"IndirectData", VAR_SERVER | VAR_HOST},
109 {"MACLength", VAR_SERVER | VAR_HOST},
110 {"PMTU", VAR_SERVER | VAR_HOST},
111 {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
113 {"PublicKey", VAR_HOST | VAR_OBSOLETE},
114 {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
115 {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
116 {"TCPOnly", VAR_SERVER | VAR_HOST},
117 {"Weight", VAR_HOST | VAR_SAFE},
121 static bool fcopy(FILE *out, const char *filename) {
122 FILE *in = fopen(filename, "r");
124 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
130 while((len = fread(buf, 1, sizeof buf, in)))
131 fwrite(buf, len, 1, out);
136 static int rstrip(char *value) {
137 int len = strlen(value);
138 while(len && strchr("\t\r\n ", value[len - 1]))
143 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
145 if(!filename || (*hostname && *port))
148 FILE *f = fopen(filename, "r");
152 while(fgets(line, sizeof line, f)) {
156 p += strcspn(p, "\t =");
159 q = p + strspn(p, "\t ");
161 q += 1 + strspn(q + 1, "\t ");
163 p = q + strcspn(q, "\t ");
166 p += strspn(p, "\t ");
167 p[strcspn(p, "\t ")] = 0;
169 if(!*port && !strcasecmp(line, "Port")) {
171 } else if(!*hostname && !strcasecmp(line, "Address")) {
172 *hostname = xstrdup(q);
179 if(*hostname && *port)
185 static char *get_my_hostname(meshlink_handle_t* mesh) {
186 char *hostname = NULL;
188 char *hostport = NULL;
189 char *name = mesh->self->name;
190 char filename[PATH_MAX] = "";
194 // Use first Address statement in own host config file
195 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
196 scan_for_hostname(filename, &hostname, &port);
201 // If that doesn't work, guess externally visible hostname
202 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
203 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
204 struct addrinfo *aip = ai;
205 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
208 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
210 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
216 send(s, request, sizeof request - 1, 0);
217 int len = recv(s, line, sizeof line - 1, MSG_WAITALL);
220 if(line[len - 1] == '\n')
222 char *p = strrchr(line, '\n');
224 hostname = xstrdup(p + 1);
237 // Check that the hostname is reasonable
239 for(char *p = hostname; *p; p++) {
240 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
242 // If not, forget it.
252 f = fopen(filename, "a");
254 fprintf(f, "\nAddress = %s\n", hostname);
257 logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
262 if(strchr(hostname, ':'))
263 xasprintf(&hostport, "[%s]:%s", hostname, port);
265 xasprintf(&hostport, "%s:%s", hostname, port);
267 if(strchr(hostname, ':'))
268 xasprintf(&hostport, "[%s]", hostname);
270 hostport = xstrdup(hostname);
278 static char *get_line(const char **data) {
287 static char line[1024];
288 const char *end = strchr(*data, '\n');
289 size_t len = end ? end - *data : strlen(*data);
290 if(len >= sizeof line) {
291 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
294 if(len && !isprint(**data))
297 memcpy(line, *data, len);
308 static char *get_value(const char *data, const char *var) {
309 char *line = get_line(&data);
313 char *sep = line + strcspn(line, " \t=");
314 char *val = sep + strspn(sep, " \t");
316 val += 1 + strspn(val + 1, " \t");
318 if(strcasecmp(line, var))
323 static bool try_bind(int port) {
324 struct addrinfo *ai = NULL;
325 struct addrinfo hint = {
326 .ai_flags = AI_PASSIVE,
327 .ai_family = AF_UNSPEC,
328 .ai_socktype = SOCK_STREAM,
329 .ai_protocol = IPPROTO_TCP,
333 snprintf(portstr, sizeof portstr, "%d", port);
335 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
339 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
344 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
357 static int check_port(meshlink_handle_t *mesh) {
358 for(int i = 0; i < 1000; i++) {
359 int port = 0x1000 + (rand() & 0x7fff);
361 char filename[PATH_MAX];
362 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
363 FILE *f = fopen(filename, "a");
365 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
369 fprintf(f, "Port = %d\n", port);
375 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
379 static bool finalize_join(meshlink_handle_t *mesh) {
380 char *name = xstrdup(get_value(mesh->data, "Name"));
382 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
386 if(!check_id(name)) {
387 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
391 char filename[PATH_MAX];
392 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
394 FILE *f = fopen(filename, "w");
396 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
400 fprintf(f, "Name = %s\n", name);
402 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
403 FILE *fh = fopen(filename, "w");
405 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
410 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
411 // Other chunks go unfiltered to their respective host config files
412 const char *p = mesh->data;
415 while((l = get_line(&p))) {
420 // Split line into variable and value
421 int len = strcspn(l, "\t =");
423 value += strspn(value, "\t ");
426 value += strspn(value, "\t ");
431 if(!strcasecmp(l, "Name"))
432 if(strcmp(value, name))
436 else if(!strcasecmp(l, "NetName"))
439 // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
442 for(i = 0; variables[i].name; i++) {
443 if(strcasecmp(l, variables[i].name))
449 // Ignore unknown and unsafe variables
451 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
453 } else if(!(variables[i].type & VAR_SAFE)) {
454 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
458 // Copy the safe variable to the right config file
459 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
464 while(l && !strcasecmp(l, "Name")) {
465 if(!check_id(value)) {
466 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
470 if(!strcmp(value, name)) {
471 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
475 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
476 f = fopen(filename, "w");
479 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
483 while((l = get_line(&p))) {
484 if(!strcmp(l, "#---------------------------------------------------------------#"))
486 int len = strcspn(l, "\t =");
487 if(len == 4 && !strncasecmp(l, "Name", 4)) {
489 value += strspn(value, "\t ");
492 value += strspn(value, "\t ");
505 char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
509 fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
510 fprintf(fh, "Port = %s\n", mesh->myport);
514 sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
517 free(mesh->self->name);
518 free(mesh->self->connection->name);
519 mesh->self->name = xstrdup(name);
520 mesh->self->connection->name = name;
522 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
524 load_all_nodes(mesh);
529 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
530 meshlink_handle_t* mesh = handle;
532 int result = send(mesh->sock, data, len, 0);
533 if(result == -1 && errno == EINTR)
543 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
544 meshlink_handle_t* mesh = handle;
546 case SPTPS_HANDSHAKE:
547 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof mesh->cookie);
550 mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
551 memcpy(mesh->data + mesh->thedatalen, msg, len);
552 mesh->thedatalen += len;
553 mesh->data[mesh->thedatalen] = 0;
557 return finalize_join(mesh);
560 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
561 shutdown(mesh->sock, SHUT_RDWR);
562 mesh->success = true;
572 static bool recvline(meshlink_handle_t* mesh, size_t len) {
573 char *newline = NULL;
578 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
579 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof mesh->buffer - mesh->blen, 0);
580 if(result == -1 && errno == EINTR)
584 mesh->blen += result;
587 if(newline - mesh->buffer >= len)
590 len = newline - mesh->buffer;
592 memcpy(mesh->line, mesh->buffer, len);
594 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
595 mesh->blen -= len + 1;
599 static bool sendline(int fd, char *format, ...) {
600 static char buffer[4096];
605 va_start(ap, format);
606 blen = vsnprintf(buffer, sizeof buffer, format, ap);
609 if(blen < 1 || blen >= sizeof buffer)
616 int result = send(fd, p, blen, MSG_NOSIGNAL);
617 if(result == -1 && errno == EINTR)
628 static const char *errstr[] = {
629 [MESHLINK_OK] = "No error",
630 [MESHLINK_EINVAL] = "Invalid argument",
631 [MESHLINK_ENOMEM] = "Out of memory",
632 [MESHLINK_ENOENT] = "No such node",
633 [MESHLINK_EEXIST] = "Node already exists",
634 [MESHLINK_EINTERNAL] = "Internal error",
635 [MESHLINK_ERESOLV] = "Could not resolve hostname",
636 [MESHLINK_ESTORAGE] = "Storage error",
637 [MESHLINK_ENETWORK] = "Network error",
638 [MESHLINK_EPEER] = "Error communicating with peer",
641 const char *meshlink_strerror(meshlink_errno_t err) {
642 if(err < 0 || err >= sizeof errstr / sizeof *errstr)
643 return "Invalid error code";
647 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
650 char pubname[PATH_MAX], privname[PATH_MAX];
652 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
654 if(!(key = ecdsa_generate())) {
655 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
656 meshlink_errno = MESHLINK_EINTERNAL;
659 logger(mesh, MESHLINK_DEBUG, "Done.\n");
661 snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
662 f = fopen(privname, "w");
665 meshlink_errno = MESHLINK_ESTORAGE;
670 fchmod(fileno(f), 0600);
673 if(!ecdsa_write_pem_private_key(key, f)) {
674 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
677 meshlink_errno = MESHLINK_EINTERNAL;
683 snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
684 f = fopen(pubname, "a");
687 meshlink_errno = MESHLINK_ESTORAGE;
691 char *pubkey = ecdsa_get_base64_public_key(key);
692 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
701 static bool meshlink_setup(meshlink_handle_t *mesh) {
702 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
703 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
704 meshlink_errno = MESHLINK_ESTORAGE;
708 char filename[PATH_MAX];
709 snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
711 if(mkdir(filename, 0777) && errno != EEXIST) {
712 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
713 meshlink_errno = MESHLINK_ESTORAGE;
717 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
719 if(!access(filename, F_OK)) {
720 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
721 meshlink_errno = MESHLINK_EEXIST;
725 FILE *f = fopen(filename, "w");
727 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
728 meshlink_errno = MESHLINK_ESTORAGE;
732 fprintf(f, "Name = %s\n", mesh->name);
735 if(!ecdsa_keygen(mesh)) {
736 meshlink_errno = MESHLINK_EINTERNAL;
745 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char* appname, dev_class_t devclass) {
746 return meshlink_open_with_size(confbase, name, appname, devclass, sizeof(meshlink_handle_t));
749 meshlink_handle_t *meshlink_open_with_size(const char *confbase, const char *name, const char* appname, dev_class_t devclass, size_t size) {
751 // Validate arguments provided by the application
752 bool usingname = false;
754 if(!confbase || !*confbase) {
755 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
756 meshlink_errno = MESHLINK_EINVAL;
760 if(!appname || !*appname) {
761 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
762 meshlink_errno = MESHLINK_EINVAL;
766 if(!name || !*name) {
767 logger(NULL, MESHLINK_ERROR, "No name given!\n");
770 else { //check name only if there is a name != NULL
772 if(!check_id(name)) {
773 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
774 meshlink_errno = MESHLINK_EINVAL;
776 } else { usingname = true;}
779 if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
780 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
781 meshlink_errno = MESHLINK_EINVAL;
785 meshlink_handle_t *mesh = xzalloc(size);
786 mesh->confbase = xstrdup(confbase);
787 mesh->appname = xstrdup(appname);
788 mesh->devclass = devclass;
789 if (usingname) mesh->name = xstrdup(name);
790 pthread_mutex_init ( &(mesh->nodes_mutex), NULL);
791 mesh->threadstarted = false;
792 event_loop_init(&mesh->loop);
793 mesh->loop.data = mesh;
795 // Check whether meshlink.conf already exists
797 char filename[PATH_MAX];
798 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
800 if(access(filename, R_OK)) {
801 if(errno == ENOENT) {
803 if(!meshlink_setup(mesh)) {
804 // meshlink_errno is set by meshlink_setup()
808 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
809 meshlink_close(mesh);
810 meshlink_errno = MESHLINK_ESTORAGE;
815 // Read the configuration
817 init_configuration(&mesh->config);
819 if(!read_server_config(mesh)) {
820 meshlink_close(mesh);
821 meshlink_errno = MESHLINK_ESTORAGE;
826 struct WSAData wsa_state;
827 WSAStartup(MAKEWORD(2, 2), &wsa_state);
830 // Setup up everything
831 // TODO: we should not open listening sockets yet
833 if(!setup_network(mesh)) {
834 meshlink_close(mesh);
835 meshlink_errno = MESHLINK_ENETWORK;
842 static void *meshlink_main_loop(void *arg) {
843 meshlink_handle_t *mesh = arg;
845 try_outgoing_connections(mesh);
847 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
849 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
854 bool meshlink_start(meshlink_handle_t *mesh) {
856 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
859 meshlink_errno = MESHLINK_EINVAL;
863 // TODO: open listening sockets first
865 //Check that a valid name is set
867 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
868 meshlink_errno = MESHLINK_EINVAL;
872 // Start the main thread
874 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
875 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
876 memset(&mesh->thread, 0, sizeof mesh->thread);
877 meshlink_errno = MESHLINK_EINTERNAL;
881 mesh->threadstarted=true;
883 discovery_start(mesh);
888 void meshlink_stop(meshlink_handle_t *mesh) {
890 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
893 meshlink_errno = MESHLINK_EINVAL;
898 discovery_stop(mesh);
900 // Shut down a listening socket to signal the main thread to shut down
902 listen_socket_t *s = &mesh->listen_socket[0];
903 shutdown(s->tcp.fd, SHUT_RDWR);
905 // Wait for the main thread to finish
907 pthread_join(mesh->thread, NULL);
908 mesh->threadstarted = false;
912 closesocket(s->tcp.fd);
913 io_del(&mesh->loop, &s->tcp);
914 s->tcp.fd = setup_listen_socket(&s->sa);
916 logger(mesh, MESHLINK_ERROR, "Could not repair listenen socket!");
918 io_add(&mesh->loop, &s->tcp, handle_new_meta_connection, s, s->tcp.fd, IO_READ);
921 void meshlink_close(meshlink_handle_t *mesh) {
922 if(!mesh || !mesh->confbase) {
923 meshlink_errno = MESHLINK_EINVAL;
927 // Close and free all resources used.
929 close_network_connections(mesh);
931 logger(mesh, MESHLINK_INFO, "Terminating");
933 exit_configuration(&mesh->config);
934 event_loop_exit(&mesh->loop);
941 ecdsa_free(mesh->invitation_key);
945 free(mesh->confbase);
947 memset(mesh, 0, sizeof *mesh);
952 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
954 meshlink_errno = MESHLINK_EINVAL;
958 mesh->receive_cb = cb;
961 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
963 meshlink_errno = MESHLINK_EINVAL;
967 mesh->node_status_cb = cb;
970 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
973 mesh->log_level = cb ? level : 0;
976 global_log_level = cb ? level : 0;
980 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
981 if(!mesh || !destination) {
982 meshlink_errno = MESHLINK_EINVAL;
990 meshlink_errno = MESHLINK_EINVAL;
994 //add packet to the queue
995 outpacketqueue_t *packet_in_queue = xzalloc(sizeof *packet_in_queue);
996 packet_in_queue->destination=destination;
997 packet_in_queue->data=data;
998 packet_in_queue->len=len;
999 if(!meshlink_queue_push(&mesh->outpacketqueue, packet_in_queue)) {
1000 free(packet_in_queue);
1005 signal_trigger(&(mesh->loop),&(mesh->datafromapp));
1009 void meshlink_send_from_queue(event_loop_t* el,meshlink_handle_t *mesh) {
1010 vpn_packet_t packet;
1011 meshlink_packethdr_t *hdr = (meshlink_packethdr_t *)packet.data;
1013 outpacketqueue_t* p = meshlink_queue_pop(&mesh->outpacketqueue);
1017 if (sizeof(meshlink_packethdr_t) + p->len > MAXSIZE) {
1022 packet.probe = false;
1023 memset(hdr, 0, sizeof *hdr);
1024 memcpy(hdr->destination, p->destination->name, sizeof hdr->destination);
1025 memcpy(hdr->source, mesh->self->name, sizeof hdr->source);
1027 packet.len = sizeof *hdr + p->len;
1028 memcpy(packet.data + sizeof *hdr, p->data, p->len);
1030 mesh->self->in_packets++;
1031 mesh->self->in_bytes += packet.len;
1032 route(mesh, mesh->self, &packet);
1036 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1037 if(!mesh || !destination) {
1038 meshlink_errno = MESHLINK_EINVAL;
1042 node_t *n = (node_t *)destination;
1043 if(!n->status.reachable)
1045 else if(n->mtuprobes > 30 && n->minmtu)
1051 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1052 if(!mesh || !node) {
1053 meshlink_errno = MESHLINK_EINVAL;
1057 node_t *n = (node_t *)node;
1059 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1060 meshlink_errno = MESHLINK_EINTERNAL;
1064 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1067 meshlink_errno = MESHLINK_EINTERNAL;
1072 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1073 if(!mesh || !name) {
1074 meshlink_errno = MESHLINK_EINVAL;
1078 return (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1081 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1082 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1083 meshlink_errno = MESHLINK_EINVAL;
1087 meshlink_node_t **result;
1090 pthread_mutex_lock(&(mesh->nodes_mutex));
1092 *nmemb = mesh->nodes->count;
1093 result = realloc(nodes, *nmemb * sizeof *nodes);
1096 meshlink_node_t **p = result;
1097 for splay_each(node_t, n, mesh->nodes)
1098 *p++ = (meshlink_node_t *)n;
1102 meshlink_errno = MESHLINK_ENOMEM;
1105 pthread_mutex_unlock(&(mesh->nodes_mutex));
1110 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1111 if(!mesh || !data || !len || !signature || !siglen) {
1112 meshlink_errno = MESHLINK_EINVAL;
1116 if(*siglen < MESHLINK_SIGLEN) {
1117 meshlink_errno = MESHLINK_EINVAL;
1121 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1122 meshlink_errno = MESHLINK_EINTERNAL;
1126 *siglen = MESHLINK_SIGLEN;
1130 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1131 if(!mesh || !data || !len || !signature) {
1132 meshlink_errno = MESHLINK_EINVAL;
1136 if(siglen != MESHLINK_SIGLEN) {
1137 meshlink_errno = MESHLINK_EINVAL;
1141 struct node_t *n = (struct node_t *)source;
1142 node_read_ecdsa_public_key(mesh, n);
1144 meshlink_errno = MESHLINK_EINTERNAL;
1148 return ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1151 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1152 char filename[PATH_MAX];
1154 snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
1155 if(mkdir(filename, 0700) && errno != EEXIST) {
1156 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1157 meshlink_errno = MESHLINK_ESTORAGE;
1161 // Count the number of valid invitations, clean up old ones
1162 DIR *dir = opendir(filename);
1164 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1165 meshlink_errno = MESHLINK_ESTORAGE;
1172 time_t deadline = time(NULL) - 604800; // 1 week in the past
1174 while((ent = readdir(dir))) {
1175 if(strlen(ent->d_name) != 24)
1177 char invname[PATH_MAX];
1179 snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
1180 if(!stat(invname, &st)) {
1181 if(mesh->invitation_key && deadline < st.st_mtime)
1186 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1192 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1194 meshlink_errno = MESHLINK_ESTORAGE;
1200 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1202 // Remove the key if there are no outstanding invitations.
1205 if(mesh->invitation_key) {
1206 ecdsa_free(mesh->invitation_key);
1207 mesh->invitation_key = NULL;
1211 if(mesh->invitation_key)
1214 // Create a new key if necessary.
1215 FILE *f = fopen(filename, "r");
1217 if(errno != ENOENT) {
1218 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1219 meshlink_errno = MESHLINK_ESTORAGE;
1223 mesh->invitation_key = ecdsa_generate();
1224 if(!mesh->invitation_key) {
1225 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1226 meshlink_errno = MESHLINK_EINTERNAL;
1229 f = fopen(filename, "w");
1231 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1232 meshlink_errno = MESHLINK_ESTORAGE;
1235 chmod(filename, 0600);
1236 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1239 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1241 if(!mesh->invitation_key) {
1242 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1243 meshlink_errno = MESHLINK_ESTORAGE;
1247 return mesh->invitation_key;
1250 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1251 if(!mesh || !address) {
1252 meshlink_errno = MESHLINK_EINVAL;
1256 for(const char *p = address; *p; p++) {
1257 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
1259 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1260 meshlink_errno = MESHLINK_EINVAL;
1264 return append_config_file(mesh, mesh->self->name, "Address", address);
1267 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1269 meshlink_errno = MESHLINK_EINVAL;
1273 // Check validity of the new node's name
1274 if(!check_id(name)) {
1275 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1276 meshlink_errno = MESHLINK_EINVAL;
1280 // Ensure no host configuration file with that name exists
1281 char filename[PATH_MAX];
1282 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1283 if(!access(filename, F_OK)) {
1284 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1285 meshlink_errno = MESHLINK_EEXIST;
1289 // Ensure no other nodes know about this name
1290 if(meshlink_get_node(mesh, name)) {
1291 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1292 meshlink_errno = MESHLINK_EEXIST;
1296 // Get the local address
1297 char *address = get_my_hostname(mesh);
1299 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1300 meshlink_errno = MESHLINK_ERESOLV;
1304 if(!refresh_invitation_key(mesh)) {
1305 meshlink_errno = MESHLINK_EINTERNAL;
1311 // Create a hash of the key.
1312 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1313 sha512(fingerprint, strlen(fingerprint), hash);
1314 b64encode_urlsafe(hash, hash, 18);
1316 // Create a random cookie for this invitation.
1318 randomize(cookie, 18);
1320 // Create a filename that doesn't reveal the cookie itself
1321 char buf[18 + strlen(fingerprint)];
1322 char cookiehash[64];
1323 memcpy(buf, cookie, 18);
1324 memcpy(buf + 18, fingerprint, sizeof buf - 18);
1325 sha512(buf, sizeof buf, cookiehash);
1326 b64encode_urlsafe(cookiehash, cookiehash, 18);
1328 b64encode_urlsafe(cookie, cookie, 18);
1332 // Create a file containing the details of the invitation.
1333 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1334 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1336 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1337 meshlink_errno = MESHLINK_ESTORAGE;
1340 FILE *f = fdopen(ifd, "w");
1344 // Fill in the details.
1345 fprintf(f, "Name = %s\n", name);
1347 // fprintf(f, "NetName = %s\n", netname);
1348 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1350 // Copy Broadcast and Mode
1351 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
1352 FILE *tc = fopen(filename, "r");
1355 while(fgets(buf, sizeof buf, tc)) {
1356 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1357 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1359 // Make sure there is a newline character.
1360 if(!strchr(buf, '\n'))
1366 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1367 meshlink_errno = MESHLINK_ESTORAGE;
1371 fprintf(f, "#---------------------------------------------------------------#\n");
1372 fprintf(f, "Name = %s\n", mesh->self->name);
1374 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1378 // Create an URL from the local address, key hash and cookie
1380 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1386 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1387 if(!mesh || !invitation) {
1388 meshlink_errno = MESHLINK_EINVAL;
1392 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
1393 char copy[strlen(invitation) + 1];
1394 strcpy(copy, invitation);
1396 // Split the invitation URL into hostname, port, key hash and cookie.
1398 char *slash = strchr(copy, '/');
1404 if(strlen(slash) != 48)
1407 char *address = copy;
1409 if(*address == '[') {
1411 char *bracket = strchr(address, ']');
1415 if(bracket[1] == ':')
1418 port = strchr(address, ':');
1426 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
1429 // Generate a throw-away key for the invitation.
1430 ecdsa_t *key = ecdsa_generate();
1432 meshlink_errno = MESHLINK_EINTERNAL;
1436 char *b64key = ecdsa_get_base64_public_key(key);
1438 //Before doing meshlink_join make sure we are not connected to another mesh
1439 if ( mesh->threadstarted ){
1443 // Connect to the meshlink daemon mentioned in the URL.
1444 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
1446 meshlink_errno = MESHLINK_ERESOLV;
1450 mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1451 if(mesh->sock <= 0) {
1452 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
1454 meshlink_errno = MESHLINK_ENETWORK;
1458 if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
1459 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
1460 closesocket(mesh->sock);
1462 meshlink_errno = MESHLINK_ENETWORK;
1468 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
1470 // Tell him we have an invitation, and give him our throw-away key.
1474 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
1475 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
1476 closesocket(mesh->sock);
1477 meshlink_errno = MESHLINK_ENETWORK;
1483 char hisname[4096] = "";
1484 int code, hismajor, hisminor = 0;
1486 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) {
1487 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
1488 closesocket(mesh->sock);
1489 meshlink_errno = MESHLINK_ENETWORK;
1493 // Check if the hash of the key he gave us matches the hash in the URL.
1494 char *fingerprint = mesh->line + 2;
1496 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
1497 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
1498 meshlink_errno = MESHLINK_EINTERNAL;
1501 if(memcmp(hishash, mesh->hash, 18)) {
1502 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
1503 meshlink_errno = MESHLINK_EPEER;
1508 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
1510 meshlink_errno = MESHLINK_EINTERNAL;
1514 // Start an SPTPS session
1515 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) {
1516 meshlink_errno = MESHLINK_EINTERNAL;
1520 // Feed rest of input buffer to SPTPS
1521 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
1522 meshlink_errno = MESHLINK_EPEER;
1528 while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
1532 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
1533 meshlink_errno = MESHLINK_ENETWORK;
1537 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
1538 meshlink_errno = MESHLINK_EPEER;
1543 sptps_stop(&mesh->sptps);
1546 closesocket(mesh->sock);
1548 if(!mesh->success) {
1549 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
1550 meshlink_errno = MESHLINK_EPEER;
1557 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL or you are already connected to a Mesh ?\n");
1558 meshlink_errno = MESHLINK_EINVAL;
1562 char *meshlink_export(meshlink_handle_t *mesh) {
1564 meshlink_errno = MESHLINK_EINVAL;
1568 char filename[PATH_MAX];
1569 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1570 FILE *f = fopen(filename, "r");
1572 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
1573 meshlink_errno = MESHLINK_ESTORAGE;
1577 fseek(f, 0, SEEK_END);
1578 int fsize = ftell(f);
1581 size_t len = fsize + 9 + strlen(mesh->self->name);
1582 char *buf = xmalloc(len);
1583 snprintf(buf, len, "Name = %s\n", mesh->self->name);
1584 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
1585 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
1587 meshlink_errno = MESHLINK_ESTORAGE;
1596 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
1597 if(!mesh || !data) {
1598 meshlink_errno = MESHLINK_EINVAL;
1602 if(strncmp(data, "Name = ", 7)) {
1603 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1604 meshlink_errno = MESHLINK_EPEER;
1608 char *end = strchr(data + 7, '\n');
1610 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1611 meshlink_errno = MESHLINK_EPEER;
1615 int len = end - (data + 7);
1617 memcpy(name, data + 7, len);
1619 if(!check_id(name)) {
1620 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
1621 meshlink_errno = MESHLINK_EPEER;
1625 char filename[PATH_MAX];
1626 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1627 if(!access(filename, F_OK)) {
1628 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
1629 meshlink_errno = MESHLINK_EEXIST;
1633 if(errno != ENOENT) {
1634 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
1635 meshlink_errno = MESHLINK_ESTORAGE;
1639 FILE *f = fopen(filename, "w");
1641 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1642 meshlink_errno = MESHLINK_ESTORAGE;
1646 fwrite(end + 1, strlen(end + 1), 1, f);
1649 load_all_nodes(mesh);
1654 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1655 if(!mesh || !node) {
1656 meshlink_errno = MESHLINK_EINVAL;
1662 n->status.blacklisted=true;
1663 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name);
1665 //Make blacklisting persistent in the config file
1666 append_config_file(mesh, n->name, "blacklisted", "yes");
1671 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1672 if(!mesh || !node) {
1673 meshlink_errno = MESHLINK_EINVAL;
1677 node_t *n = (node_t *)node;
1678 n->status.blacklisted = false;
1680 //TODO: remove blacklisted = yes from the config file
1685 /* Hint that a hostname may be found at an address
1686 * See header file for detailed comment.
1688 extern void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
1689 if(!mesh || !node || !addr)
1692 char *host = NULL, *port = NULL, *str = NULL;
1693 sockaddr2str((const sockaddr_t *)addr, &host, &port);
1696 xasprintf(&str, "%s %s", host, port);
1697 append_config_file(mesh, node->name, "Address", str);
1704 // @TODO do we want to fire off a connection attempt right away?
1707 static void __attribute__((constructor)) meshlink_init(void) {
1711 static void __attribute__((destructor)) meshlink_exit(void) {
1716 /// Device class traits
1717 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX +1] = {
1718 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
1719 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
1720 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
1721 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN