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 __thread meshlink_errno_t meshlink_errno;
52 meshlink_log_cb_t global_log_cb;
53 meshlink_log_level_t global_log_level;
55 //TODO: this can go away completely
56 const var_t variables[] = {
57 /* Server configuration */
58 {"AddressFamily", VAR_SERVER},
59 {"AutoConnect", VAR_SERVER | VAR_SAFE},
60 {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
61 {"BindToInterface", VAR_SERVER},
62 {"Broadcast", VAR_SERVER | VAR_SAFE},
63 {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
64 {"DecrementTTL", VAR_SERVER},
65 {"Device", VAR_SERVER},
66 {"DeviceType", VAR_SERVER},
67 {"DirectOnly", VAR_SERVER},
68 {"ECDSAPrivateKeyFile", VAR_SERVER},
69 {"ExperimentalProtocol", VAR_SERVER},
70 {"Forwarding", VAR_SERVER},
71 {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
72 {"Hostnames", VAR_SERVER},
73 {"IffOneQueue", VAR_SERVER},
74 {"Interface", VAR_SERVER},
75 {"KeyExpire", VAR_SERVER},
76 {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
77 {"LocalDiscovery", VAR_SERVER},
78 {"MACExpire", VAR_SERVER},
79 {"MaxConnectionBurst", VAR_SERVER},
80 {"MaxOutputBufferSize", VAR_SERVER},
81 {"MaxTimeout", VAR_SERVER},
82 {"Mode", VAR_SERVER | VAR_SAFE},
84 {"PingInterval", VAR_SERVER},
85 {"PingTimeout", VAR_SERVER},
86 {"PriorityInheritance", VAR_SERVER},
87 {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
88 {"PrivateKeyFile", VAR_SERVER},
89 {"ProcessPriority", VAR_SERVER},
90 {"Proxy", VAR_SERVER},
91 {"ReplayWindow", VAR_SERVER},
92 {"ScriptsExtension", VAR_SERVER},
93 {"ScriptsInterpreter", VAR_SERVER},
94 {"StrictSubnets", VAR_SERVER},
95 {"TunnelServer", VAR_SERVER},
96 {"VDEGroup", VAR_SERVER},
97 {"VDEPort", VAR_SERVER},
98 /* Host configuration */
99 {"Address", VAR_HOST | VAR_MULTIPLE},
100 {"Cipher", VAR_SERVER | VAR_HOST},
101 {"ClampMSS", VAR_SERVER | VAR_HOST},
102 {"Compression", VAR_SERVER | VAR_HOST},
103 {"Digest", VAR_SERVER | VAR_HOST},
104 {"ECDSAPublicKey", VAR_HOST},
105 {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
106 {"IndirectData", VAR_SERVER | VAR_HOST},
107 {"MACLength", VAR_SERVER | VAR_HOST},
108 {"PMTU", VAR_SERVER | VAR_HOST},
109 {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
111 {"PublicKey", VAR_HOST | VAR_OBSOLETE},
112 {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
113 {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
114 {"TCPOnly", VAR_SERVER | VAR_HOST},
115 {"Weight", VAR_HOST | VAR_SAFE},
119 static bool fcopy(FILE *out, const char *filename) {
120 FILE *in = fopen(filename, "r");
122 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
128 while((len = fread(buf, 1, sizeof buf, in)))
129 fwrite(buf, len, 1, out);
134 static int rstrip(char *value) {
135 int len = strlen(value);
136 while(len && strchr("\t\r\n ", value[len - 1]))
141 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
143 if(!filename || (*hostname && *port))
146 FILE *f = fopen(filename, "r");
150 while(fgets(line, sizeof line, f)) {
154 p += strcspn(p, "\t =");
157 q = p + strspn(p, "\t ");
159 q += 1 + strspn(q + 1, "\t ");
161 p = q + strcspn(q, "\t ");
164 p += strspn(p, "\t ");
165 p[strcspn(p, "\t ")] = 0;
167 if(!*port && !strcasecmp(line, "Port")) {
169 } else if(!*hostname && !strcasecmp(line, "Address")) {
170 *hostname = xstrdup(q);
177 if(*hostname && *port)
183 static char *get_my_hostname(meshlink_handle_t* mesh) {
184 char *hostname = NULL;
186 char *hostport = NULL;
187 char *name = mesh->self->name;
188 char filename[PATH_MAX] = "";
192 // Use first Address statement in own host config file
193 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
194 scan_for_hostname(filename, &hostname, &port);
199 // If that doesn't work, guess externally visible hostname
200 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
201 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
202 struct addrinfo *aip = ai;
203 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
206 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
208 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
214 send(s, request, sizeof request - 1, 0);
215 int len = recv(s, line, sizeof line - 1, MSG_WAITALL);
218 if(line[len - 1] == '\n')
220 char *p = strrchr(line, '\n');
222 hostname = xstrdup(p + 1);
235 // Check that the hostname is reasonable
237 for(char *p = hostname; *p; p++) {
238 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
240 // If not, forget it.
250 f = fopen(filename, "a");
252 fprintf(f, "\nAddress = %s\n", hostname);
255 logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
260 if(strchr(hostname, ':'))
261 xasprintf(&hostport, "[%s]:%s", hostname, port);
263 xasprintf(&hostport, "%s:%s", hostname, port);
265 if(strchr(hostname, ':'))
266 xasprintf(&hostport, "[%s]", hostname);
268 hostport = xstrdup(hostname);
276 static char *get_line(const char **data) {
285 static char line[1024];
286 const char *end = strchr(*data, '\n');
287 size_t len = end ? end - *data : strlen(*data);
288 if(len >= sizeof line) {
289 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
292 if(len && !isprint(**data))
295 memcpy(line, *data, len);
306 static char *get_value(const char *data, const char *var) {
307 char *line = get_line(&data);
311 char *sep = line + strcspn(line, " \t=");
312 char *val = sep + strspn(sep, " \t");
314 val += 1 + strspn(val + 1, " \t");
316 if(strcasecmp(line, var))
321 static bool try_bind(int port) {
322 struct addrinfo *ai = NULL;
323 struct addrinfo hint = {
324 .ai_flags = AI_PASSIVE,
325 .ai_family = AF_UNSPEC,
326 .ai_socktype = SOCK_STREAM,
327 .ai_protocol = IPPROTO_TCP,
331 snprintf(portstr, sizeof portstr, "%d", port);
333 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
337 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
342 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
355 static int check_port(meshlink_handle_t *mesh) {
356 for(int i = 0; i < 1000; i++) {
357 int port = 0x1000 + (rand() & 0x7fff);
359 char filename[PATH_MAX];
360 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
361 FILE *f = fopen(filename, "a");
363 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
367 fprintf(f, "Port = %d\n", port);
373 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
377 static bool finalize_join(meshlink_handle_t *mesh) {
378 char *name = xstrdup(get_value(mesh->data, "Name"));
380 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
384 if(!check_id(name)) {
385 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
389 char filename[PATH_MAX];
390 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
392 FILE *f = fopen(filename, "w");
394 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
398 fprintf(f, "Name = %s\n", name);
400 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
401 FILE *fh = fopen(filename, "w");
403 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
408 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
409 // Other chunks go unfiltered to their respective host config files
410 const char *p = mesh->data;
413 while((l = get_line(&p))) {
418 // Split line into variable and value
419 int len = strcspn(l, "\t =");
421 value += strspn(value, "\t ");
424 value += strspn(value, "\t ");
429 if(!strcasecmp(l, "Name"))
430 if(strcmp(value, name))
434 else if(!strcasecmp(l, "NetName"))
437 // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
440 for(i = 0; variables[i].name; i++) {
441 if(strcasecmp(l, variables[i].name))
447 // Ignore unknown and unsafe variables
449 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
451 } else if(!(variables[i].type & VAR_SAFE)) {
452 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
456 // Copy the safe variable to the right config file
457 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
462 while(l && !strcasecmp(l, "Name")) {
463 if(!check_id(value)) {
464 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
468 if(!strcmp(value, name)) {
469 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
473 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
474 f = fopen(filename, "w");
477 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
481 while((l = get_line(&p))) {
482 if(!strcmp(l, "#---------------------------------------------------------------#"))
484 int len = strcspn(l, "\t =");
485 if(len == 4 && !strncasecmp(l, "Name", 4)) {
487 value += strspn(value, "\t ");
490 value += strspn(value, "\t ");
503 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 mesh->thedatalen = 0;
558 return finalize_join(mesh);
561 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
562 shutdown(mesh->sock, SHUT_RDWR);
563 mesh->success = true;
573 static bool recvline(meshlink_handle_t* mesh, size_t len) {
574 char *newline = NULL;
579 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
580 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof mesh->buffer - mesh->blen, 0);
581 if(result == -1 && errno == EINTR)
585 mesh->blen += result;
588 if(newline - mesh->buffer >= len)
591 len = newline - mesh->buffer;
593 memcpy(mesh->line, mesh->buffer, len);
595 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
596 mesh->blen -= len + 1;
600 static bool sendline(int fd, char *format, ...) {
601 static char buffer[4096];
606 va_start(ap, format);
607 blen = vsnprintf(buffer, sizeof buffer, format, ap);
610 if(blen < 1 || blen >= sizeof buffer)
617 int result = send(fd, p, blen, MSG_NOSIGNAL);
618 if(result == -1 && errno == EINTR)
629 static const char *errstr[] = {
630 [MESHLINK_OK] = "No error",
631 [MESHLINK_EINVAL] = "Invalid argument",
632 [MESHLINK_ENOMEM] = "Out of memory",
633 [MESHLINK_ENOENT] = "No such node",
634 [MESHLINK_EEXIST] = "Node already exists",
635 [MESHLINK_EINTERNAL] = "Internal error",
636 [MESHLINK_ERESOLV] = "Could not resolve hostname",
637 [MESHLINK_ESTORAGE] = "Storage error",
638 [MESHLINK_ENETWORK] = "Network error",
639 [MESHLINK_EPEER] = "Error communicating with peer",
642 const char *meshlink_strerror(meshlink_errno_t err) {
643 if(err < 0 || err >= sizeof errstr / sizeof *errstr)
644 return "Invalid error code";
648 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
651 char pubname[PATH_MAX], privname[PATH_MAX];
653 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
655 if(!(key = ecdsa_generate())) {
656 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
657 meshlink_errno = MESHLINK_EINTERNAL;
660 logger(mesh, MESHLINK_DEBUG, "Done.\n");
662 snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
663 f = fopen(privname, "wb");
666 meshlink_errno = MESHLINK_ESTORAGE;
671 fchmod(fileno(f), 0600);
674 if(!ecdsa_write_pem_private_key(key, f)) {
675 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
678 meshlink_errno = MESHLINK_EINTERNAL;
684 snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
685 f = fopen(pubname, "a");
688 meshlink_errno = MESHLINK_ESTORAGE;
692 char *pubkey = ecdsa_get_base64_public_key(key);
693 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
702 static struct timeval idle(event_loop_t *loop, void *data) {
703 meshlink_handle_t *mesh = data;
704 struct timeval t, tmin = {3600, 0};
705 for splay_each(node_t, n, mesh->nodes) {
708 t = utcp_timeout(n->utcp);
709 if(timercmp(&t, &tmin, <))
715 static bool meshlink_setup(meshlink_handle_t *mesh) {
716 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
717 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
718 meshlink_errno = MESHLINK_ESTORAGE;
722 char filename[PATH_MAX];
723 snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
725 if(mkdir(filename, 0777) && errno != EEXIST) {
726 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
727 meshlink_errno = MESHLINK_ESTORAGE;
731 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
733 if(!access(filename, F_OK)) {
734 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
735 meshlink_errno = MESHLINK_EEXIST;
739 FILE *f = fopen(filename, "w");
741 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
742 meshlink_errno = MESHLINK_ESTORAGE;
746 fprintf(f, "Name = %s\n", mesh->name);
749 if(!ecdsa_keygen(mesh)) {
750 meshlink_errno = MESHLINK_EINTERNAL;
759 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char* appname, dev_class_t devclass) {
760 // Validate arguments provided by the application
761 bool usingname = false;
763 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
765 if(!confbase || !*confbase) {
766 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
767 meshlink_errno = MESHLINK_EINVAL;
771 if(!appname || !*appname) {
772 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
773 meshlink_errno = MESHLINK_EINVAL;
777 if(!name || !*name) {
778 logger(NULL, MESHLINK_ERROR, "No name given!\n");
781 else { //check name only if there is a name != NULL
783 if(!check_id(name)) {
784 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
785 meshlink_errno = MESHLINK_EINVAL;
787 } else { usingname = true;}
790 if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
791 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
792 meshlink_errno = MESHLINK_EINVAL;
796 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
797 mesh->confbase = xstrdup(confbase);
798 mesh->appname = xstrdup(appname);
799 mesh->devclass = devclass;
800 if (usingname) mesh->name = xstrdup(name);
803 pthread_mutexattr_t attr;
804 pthread_mutexattr_init(&attr);
805 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
806 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
808 mesh->threadstarted = false;
809 event_loop_init(&mesh->loop);
810 mesh->loop.data = mesh;
812 // Check whether meshlink.conf already exists
814 char filename[PATH_MAX];
815 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
817 if(access(filename, R_OK)) {
818 if(errno == ENOENT) {
820 if(!meshlink_setup(mesh)) {
821 // meshlink_errno is set by meshlink_setup()
825 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
826 meshlink_close(mesh);
827 meshlink_errno = MESHLINK_ESTORAGE;
832 // Read the configuration
834 init_configuration(&mesh->config);
836 if(!read_server_config(mesh)) {
837 meshlink_close(mesh);
838 meshlink_errno = MESHLINK_ESTORAGE;
843 struct WSAData wsa_state;
844 WSAStartup(MAKEWORD(2, 2), &wsa_state);
847 // Setup up everything
848 // TODO: we should not open listening sockets yet
850 if(!setup_network(mesh)) {
851 meshlink_close(mesh);
852 meshlink_errno = MESHLINK_ENETWORK;
856 idle_set(&mesh->loop, idle, mesh);
858 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
862 static void *meshlink_main_loop(void *arg) {
863 meshlink_handle_t *mesh = arg;
865 pthread_mutex_lock(&(mesh->mesh_mutex));
867 try_outgoing_connections(mesh);
869 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
871 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
873 pthread_mutex_unlock(&(mesh->mesh_mutex));
877 bool meshlink_start(meshlink_handle_t *mesh) {
879 meshlink_errno = MESHLINK_EINVAL;
882 pthread_mutex_lock(&(mesh->mesh_mutex));
884 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
886 mesh->thedatalen = 0;
888 // TODO: open listening sockets first
890 //Check that a valid name is set
892 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
893 meshlink_errno = MESHLINK_EINVAL;
894 pthread_mutex_unlock(&(mesh->mesh_mutex));
898 // Start the main thread
900 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
901 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
902 memset(&mesh->thread, 0, sizeof mesh->thread);
903 meshlink_errno = MESHLINK_EINTERNAL;
904 pthread_mutex_unlock(&(mesh->mesh_mutex));
908 mesh->threadstarted=true;
910 discovery_start(mesh);
912 pthread_mutex_unlock(&(mesh->mesh_mutex));
916 void meshlink_stop(meshlink_handle_t *mesh) {
918 meshlink_errno = MESHLINK_EINVAL;
922 pthread_mutex_lock(&(mesh->mesh_mutex));
923 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
926 discovery_stop(mesh);
928 // Shut down a listening socket to signal the main thread to shut down
930 listen_socket_t *s = &mesh->listen_socket[0];
931 shutdown(s->tcp.fd, SHUT_RDWR);
933 // Wait for the main thread to finish
934 pthread_mutex_unlock(&(mesh->mesh_mutex));
935 pthread_join(mesh->thread, NULL);
936 pthread_mutex_lock(&(mesh->mesh_mutex));
938 mesh->threadstarted = false;
942 closesocket(s->tcp.fd);
943 io_del(&mesh->loop, &s->tcp);
944 s->tcp.fd = setup_listen_socket(&s->sa);
946 logger(mesh, MESHLINK_ERROR, "Could not repair listenen socket!");
948 io_add(&mesh->loop, &s->tcp, handle_new_meta_connection, s, s->tcp.fd, IO_READ);
950 pthread_mutex_unlock(&(mesh->mesh_mutex));
953 void meshlink_close(meshlink_handle_t *mesh) {
954 if(!mesh || !mesh->confbase) {
955 meshlink_errno = MESHLINK_EINVAL;
959 // stop can be called even if mesh has not been started
962 // lock is not released after this
963 pthread_mutex_lock(&(mesh->mesh_mutex));
965 // Close and free all resources used.
967 close_network_connections(mesh);
969 logger(mesh, MESHLINK_INFO, "Terminating");
971 exit_configuration(&mesh->config);
972 event_loop_exit(&mesh->loop);
979 ecdsa_free(mesh->invitation_key);
983 free(mesh->confbase);
984 pthread_mutex_destroy(&(mesh->mesh_mutex));
986 memset(mesh, 0, sizeof *mesh);
991 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
993 meshlink_errno = MESHLINK_EINVAL;
997 pthread_mutex_lock(&(mesh->mesh_mutex));
998 mesh->receive_cb = cb;
999 pthread_mutex_unlock(&(mesh->mesh_mutex));
1002 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1004 meshlink_errno = MESHLINK_EINVAL;
1008 pthread_mutex_lock(&(mesh->mesh_mutex));
1009 mesh->node_status_cb = cb;
1010 pthread_mutex_unlock(&(mesh->mesh_mutex));
1013 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1015 pthread_mutex_lock(&(mesh->mesh_mutex));
1017 mesh->log_level = cb ? level : 0;
1018 pthread_mutex_unlock(&(mesh->mesh_mutex));
1021 global_log_level = cb ? level : 0;
1025 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1026 meshlink_packethdr_t *hdr;
1028 // Validate arguments
1029 if(!mesh || !destination || len >= MAXSIZE - sizeof *hdr) {
1030 meshlink_errno = MESHLINK_EINVAL;
1038 meshlink_errno = MESHLINK_EINVAL;
1042 // Prepare the packet
1043 vpn_packet_t *packet = malloc(sizeof *packet);
1045 meshlink_errno = MESHLINK_ENOMEM;
1049 packet->probe = false;
1050 packet->tcp = false;
1051 packet->len = len + sizeof *hdr;
1053 hdr = (meshlink_packethdr_t *)packet->data;
1054 memset(hdr, 0, sizeof *hdr);
1055 // leave the last byte as 0 to make sure strings are always
1056 // null-terminated if they are longer than the buffer
1057 strncpy(hdr->destination, destination->name, (sizeof hdr->destination) - 1);
1058 strncpy(hdr->source, mesh->self->name, (sizeof hdr->source) -1 );
1060 memcpy(packet->data + sizeof *hdr, data, len);
1063 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1065 meshlink_errno = MESHLINK_ENOMEM;
1069 // Notify event loop
1070 signal_trigger(&(mesh->loop),&(mesh->datafromapp));
1075 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1076 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1080 mesh->self->in_packets++;
1081 mesh->self->in_bytes += packet->len;
1082 route(mesh, mesh->self, packet);
1085 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1086 if(!mesh || !destination) {
1087 meshlink_errno = MESHLINK_EINVAL;
1090 pthread_mutex_lock(&(mesh->mesh_mutex));
1092 node_t *n = (node_t *)destination;
1093 if(!n->status.reachable) {
1094 pthread_mutex_unlock(&(mesh->mesh_mutex));
1098 else if(n->mtuprobes > 30 && n->minmtu) {
1099 pthread_mutex_unlock(&(mesh->mesh_mutex));
1103 pthread_mutex_unlock(&(mesh->mesh_mutex));
1108 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1109 if(!mesh || !node) {
1110 meshlink_errno = MESHLINK_EINVAL;
1113 pthread_mutex_lock(&(mesh->mesh_mutex));
1115 node_t *n = (node_t *)node;
1117 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1118 meshlink_errno = MESHLINK_EINTERNAL;
1119 pthread_mutex_unlock(&(mesh->mesh_mutex));
1123 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1126 meshlink_errno = MESHLINK_EINTERNAL;
1128 pthread_mutex_unlock(&(mesh->mesh_mutex));
1132 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1133 if(!mesh || !name) {
1134 meshlink_errno = MESHLINK_EINVAL;
1138 meshlink_node_t *node = NULL;
1140 pthread_mutex_lock(&(mesh->mesh_mutex));
1141 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1142 pthread_mutex_unlock(&(mesh->mesh_mutex));
1146 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1147 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1148 meshlink_errno = MESHLINK_EINVAL;
1152 meshlink_node_t **result;
1155 pthread_mutex_lock(&(mesh->mesh_mutex));
1157 *nmemb = mesh->nodes->count;
1158 result = realloc(nodes, *nmemb * sizeof *nodes);
1161 meshlink_node_t **p = result;
1162 for splay_each(node_t, n, mesh->nodes)
1163 *p++ = (meshlink_node_t *)n;
1167 meshlink_errno = MESHLINK_ENOMEM;
1170 pthread_mutex_unlock(&(mesh->mesh_mutex));
1175 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1176 if(!mesh || !data || !len || !signature || !siglen) {
1177 meshlink_errno = MESHLINK_EINVAL;
1181 if(*siglen < MESHLINK_SIGLEN) {
1182 meshlink_errno = MESHLINK_EINVAL;
1186 pthread_mutex_lock(&(mesh->mesh_mutex));
1188 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1189 meshlink_errno = MESHLINK_EINTERNAL;
1190 pthread_mutex_unlock(&(mesh->mesh_mutex));
1194 *siglen = MESHLINK_SIGLEN;
1195 pthread_mutex_unlock(&(mesh->mesh_mutex));
1199 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1200 if(!mesh || !data || !len || !signature) {
1201 meshlink_errno = MESHLINK_EINVAL;
1205 if(siglen != MESHLINK_SIGLEN) {
1206 meshlink_errno = MESHLINK_EINVAL;
1210 pthread_mutex_lock(&(mesh->mesh_mutex));
1214 struct node_t *n = (struct node_t *)source;
1215 node_read_ecdsa_public_key(mesh, n);
1217 meshlink_errno = MESHLINK_EINTERNAL;
1220 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1222 pthread_mutex_unlock(&(mesh->mesh_mutex));
1226 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1227 char filename[PATH_MAX];
1229 pthread_mutex_lock(&(mesh->mesh_mutex));
1231 snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
1232 if(mkdir(filename, 0700) && errno != EEXIST) {
1233 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1234 meshlink_errno = MESHLINK_ESTORAGE;
1235 pthread_mutex_unlock(&(mesh->mesh_mutex));
1239 // Count the number of valid invitations, clean up old ones
1240 DIR *dir = opendir(filename);
1242 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1243 meshlink_errno = MESHLINK_ESTORAGE;
1244 pthread_mutex_unlock(&(mesh->mesh_mutex));
1251 time_t deadline = time(NULL) - 604800; // 1 week in the past
1253 while((ent = readdir(dir))) {
1254 if(strlen(ent->d_name) != 24)
1256 char invname[PATH_MAX];
1258 snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
1259 if(!stat(invname, &st)) {
1260 if(mesh->invitation_key && deadline < st.st_mtime)
1265 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1271 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1273 meshlink_errno = MESHLINK_ESTORAGE;
1274 pthread_mutex_unlock(&(mesh->mesh_mutex));
1280 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1282 // Remove the key if there are no outstanding invitations.
1285 if(mesh->invitation_key) {
1286 ecdsa_free(mesh->invitation_key);
1287 mesh->invitation_key = NULL;
1291 if(mesh->invitation_key) {
1292 pthread_mutex_unlock(&(mesh->mesh_mutex));
1296 // Create a new key if necessary.
1297 FILE *f = fopen(filename, "rb");
1299 if(errno != ENOENT) {
1300 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1301 meshlink_errno = MESHLINK_ESTORAGE;
1302 pthread_mutex_unlock(&(mesh->mesh_mutex));
1306 mesh->invitation_key = ecdsa_generate();
1307 if(!mesh->invitation_key) {
1308 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1309 meshlink_errno = MESHLINK_EINTERNAL;
1310 pthread_mutex_unlock(&(mesh->mesh_mutex));
1313 f = fopen(filename, "wb");
1315 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1316 meshlink_errno = MESHLINK_ESTORAGE;
1317 pthread_mutex_unlock(&(mesh->mesh_mutex));
1320 chmod(filename, 0600);
1321 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1324 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1326 if(!mesh->invitation_key) {
1327 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1328 meshlink_errno = MESHLINK_ESTORAGE;
1332 pthread_mutex_unlock(&(mesh->mesh_mutex));
1333 return mesh->invitation_key;
1336 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1337 if(!mesh || !address) {
1338 meshlink_errno = MESHLINK_EINVAL;
1344 pthread_mutex_lock(&(mesh->mesh_mutex));
1346 for(const char *p = address; *p; p++) {
1347 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
1349 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1350 meshlink_errno = MESHLINK_EINVAL;
1351 pthread_mutex_unlock(&(mesh->mesh_mutex));
1355 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1356 pthread_mutex_unlock(&(mesh->mesh_mutex));
1360 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1362 meshlink_errno = MESHLINK_EINVAL;
1366 pthread_mutex_lock(&(mesh->mesh_mutex));
1368 // Check validity of the new node's name
1369 if(!check_id(name)) {
1370 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1371 meshlink_errno = MESHLINK_EINVAL;
1372 pthread_mutex_unlock(&(mesh->mesh_mutex));
1376 // Ensure no host configuration file with that name exists
1377 char filename[PATH_MAX];
1378 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1379 if(!access(filename, F_OK)) {
1380 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1381 meshlink_errno = MESHLINK_EEXIST;
1382 pthread_mutex_unlock(&(mesh->mesh_mutex));
1386 // Ensure no other nodes know about this name
1387 if(meshlink_get_node(mesh, name)) {
1388 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1389 meshlink_errno = MESHLINK_EEXIST;
1390 pthread_mutex_unlock(&(mesh->mesh_mutex));
1394 // Get the local address
1395 char *address = get_my_hostname(mesh);
1397 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1398 meshlink_errno = MESHLINK_ERESOLV;
1399 pthread_mutex_unlock(&(mesh->mesh_mutex));
1403 if(!refresh_invitation_key(mesh)) {
1404 meshlink_errno = MESHLINK_EINTERNAL;
1405 pthread_mutex_unlock(&(mesh->mesh_mutex));
1411 // Create a hash of the key.
1412 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1413 sha512(fingerprint, strlen(fingerprint), hash);
1414 b64encode_urlsafe(hash, hash, 18);
1416 // Create a random cookie for this invitation.
1418 randomize(cookie, 18);
1420 // Create a filename that doesn't reveal the cookie itself
1421 char buf[18 + strlen(fingerprint)];
1422 char cookiehash[64];
1423 memcpy(buf, cookie, 18);
1424 memcpy(buf + 18, fingerprint, sizeof buf - 18);
1425 sha512(buf, sizeof buf, cookiehash);
1426 b64encode_urlsafe(cookiehash, cookiehash, 18);
1428 b64encode_urlsafe(cookie, cookie, 18);
1432 // Create a file containing the details of the invitation.
1433 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1434 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1436 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1437 meshlink_errno = MESHLINK_ESTORAGE;
1438 pthread_mutex_unlock(&(mesh->mesh_mutex));
1441 FILE *f = fdopen(ifd, "w");
1445 // Fill in the details.
1446 fprintf(f, "Name = %s\n", name);
1448 // fprintf(f, "NetName = %s\n", netname);
1449 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1451 // Copy Broadcast and Mode
1452 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
1453 FILE *tc = fopen(filename, "r");
1456 while(fgets(buf, sizeof buf, tc)) {
1457 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1458 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1460 // Make sure there is a newline character.
1461 if(!strchr(buf, '\n'))
1467 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1468 meshlink_errno = MESHLINK_ESTORAGE;
1469 pthread_mutex_unlock(&(mesh->mesh_mutex));
1473 fprintf(f, "#---------------------------------------------------------------#\n");
1474 fprintf(f, "Name = %s\n", mesh->self->name);
1476 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1480 // Create an URL from the local address, key hash and cookie
1482 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1485 pthread_mutex_unlock(&(mesh->mesh_mutex));
1489 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1490 if(!mesh || !invitation) {
1491 meshlink_errno = MESHLINK_EINVAL;
1495 pthread_mutex_lock(&(mesh->mesh_mutex));
1497 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
1498 char copy[strlen(invitation) + 1];
1499 strcpy(copy, invitation);
1501 // Split the invitation URL into hostname, port, key hash and cookie.
1503 char *slash = strchr(copy, '/');
1509 if(strlen(slash) != 48)
1512 char *address = copy;
1514 if(*address == '[') {
1516 char *bracket = strchr(address, ']');
1520 if(bracket[1] == ':')
1523 port = strchr(address, ':');
1531 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
1534 // Generate a throw-away key for the invitation.
1535 ecdsa_t *key = ecdsa_generate();
1537 meshlink_errno = MESHLINK_EINTERNAL;
1538 pthread_mutex_unlock(&(mesh->mesh_mutex));
1542 char *b64key = ecdsa_get_base64_public_key(key);
1544 //Before doing meshlink_join make sure we are not connected to another mesh
1545 if ( mesh->threadstarted ){
1549 // Connect to the meshlink daemon mentioned in the URL.
1550 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
1552 meshlink_errno = MESHLINK_ERESOLV;
1553 pthread_mutex_unlock(&(mesh->mesh_mutex));
1557 mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1558 if(mesh->sock <= 0) {
1559 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
1561 meshlink_errno = MESHLINK_ENETWORK;
1562 pthread_mutex_unlock(&(mesh->mesh_mutex));
1566 if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
1567 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
1568 closesocket(mesh->sock);
1570 meshlink_errno = MESHLINK_ENETWORK;
1571 pthread_mutex_unlock(&(mesh->mesh_mutex));
1577 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
1579 // Tell him we have an invitation, and give him our throw-away key.
1583 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
1584 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
1585 closesocket(mesh->sock);
1586 meshlink_errno = MESHLINK_ENETWORK;
1587 pthread_mutex_unlock(&(mesh->mesh_mutex));
1593 char hisname[4096] = "";
1594 int code, hismajor, hisminor = 0;
1596 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) {
1597 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
1598 closesocket(mesh->sock);
1599 meshlink_errno = MESHLINK_ENETWORK;
1600 pthread_mutex_unlock(&(mesh->mesh_mutex));
1604 // Check if the hash of the key he gave us matches the hash in the URL.
1605 char *fingerprint = mesh->line + 2;
1607 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
1608 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
1609 meshlink_errno = MESHLINK_EINTERNAL;
1610 pthread_mutex_unlock(&(mesh->mesh_mutex));
1613 if(memcmp(hishash, mesh->hash, 18)) {
1614 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
1615 meshlink_errno = MESHLINK_EPEER;
1616 pthread_mutex_unlock(&(mesh->mesh_mutex));
1621 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
1623 meshlink_errno = MESHLINK_EINTERNAL;
1624 pthread_mutex_unlock(&(mesh->mesh_mutex));
1628 // Start an SPTPS session
1629 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) {
1630 meshlink_errno = MESHLINK_EINTERNAL;
1631 pthread_mutex_unlock(&(mesh->mesh_mutex));
1635 // Feed rest of input buffer to SPTPS
1636 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
1637 meshlink_errno = MESHLINK_EPEER;
1638 pthread_mutex_unlock(&(mesh->mesh_mutex));
1644 while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
1648 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
1649 meshlink_errno = MESHLINK_ENETWORK;
1650 pthread_mutex_unlock(&(mesh->mesh_mutex));
1654 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
1655 meshlink_errno = MESHLINK_EPEER;
1656 pthread_mutex_unlock(&(mesh->mesh_mutex));
1661 sptps_stop(&mesh->sptps);
1664 closesocket(mesh->sock);
1666 if(!mesh->success) {
1667 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
1668 meshlink_errno = MESHLINK_EPEER;
1669 pthread_mutex_unlock(&(mesh->mesh_mutex));
1673 pthread_mutex_unlock(&(mesh->mesh_mutex));
1677 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL or you are already connected to a Mesh ?\n");
1678 meshlink_errno = MESHLINK_EINVAL;
1679 pthread_mutex_unlock(&(mesh->mesh_mutex));
1683 char *meshlink_export(meshlink_handle_t *mesh) {
1685 meshlink_errno = MESHLINK_EINVAL;
1689 pthread_mutex_lock(&(mesh->mesh_mutex));
1691 char filename[PATH_MAX];
1692 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1693 FILE *f = fopen(filename, "r");
1695 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
1696 meshlink_errno = MESHLINK_ESTORAGE;
1697 pthread_mutex_unlock(&(mesh->mesh_mutex));
1701 fseek(f, 0, SEEK_END);
1702 int fsize = ftell(f);
1705 size_t len = fsize + 9 + strlen(mesh->self->name);
1706 char *buf = xmalloc(len);
1707 snprintf(buf, len, "Name = %s\n", mesh->self->name);
1708 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
1709 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
1711 meshlink_errno = MESHLINK_ESTORAGE;
1712 pthread_mutex_unlock(&(mesh->mesh_mutex));
1719 pthread_mutex_unlock(&(mesh->mesh_mutex));
1723 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
1724 if(!mesh || !data) {
1725 meshlink_errno = MESHLINK_EINVAL;
1729 pthread_mutex_lock(&(mesh->mesh_mutex));
1731 if(strncmp(data, "Name = ", 7)) {
1732 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1733 meshlink_errno = MESHLINK_EPEER;
1734 pthread_mutex_unlock(&(mesh->mesh_mutex));
1738 char *end = strchr(data + 7, '\n');
1740 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1741 meshlink_errno = MESHLINK_EPEER;
1742 pthread_mutex_unlock(&(mesh->mesh_mutex));
1746 int len = end - (data + 7);
1748 memcpy(name, data + 7, len);
1750 if(!check_id(name)) {
1751 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
1752 meshlink_errno = MESHLINK_EPEER;
1753 pthread_mutex_unlock(&(mesh->mesh_mutex));
1757 char filename[PATH_MAX];
1758 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1759 if(!access(filename, F_OK)) {
1760 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
1761 meshlink_errno = MESHLINK_EEXIST;
1762 pthread_mutex_unlock(&(mesh->mesh_mutex));
1766 if(errno != ENOENT) {
1767 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
1768 meshlink_errno = MESHLINK_ESTORAGE;
1769 pthread_mutex_unlock(&(mesh->mesh_mutex));
1773 FILE *f = fopen(filename, "w");
1775 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1776 meshlink_errno = MESHLINK_ESTORAGE;
1777 pthread_mutex_unlock(&(mesh->mesh_mutex));
1781 fwrite(end + 1, strlen(end + 1), 1, f);
1784 load_all_nodes(mesh);
1786 pthread_mutex_unlock(&(mesh->mesh_mutex));
1790 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1791 if(!mesh || !node) {
1792 meshlink_errno = MESHLINK_EINVAL;
1796 pthread_mutex_lock(&(mesh->mesh_mutex));
1800 n->status.blacklisted=true;
1801 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name);
1803 //Make blacklisting persistent in the config file
1804 append_config_file(mesh, n->name, "blacklisted", "yes");
1806 pthread_mutex_unlock(&(mesh->mesh_mutex));
1810 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1811 if(!mesh || !node) {
1812 meshlink_errno = MESHLINK_EINVAL;
1816 pthread_mutex_lock(&(mesh->mesh_mutex));
1818 node_t *n = (node_t *)node;
1819 n->status.blacklisted = false;
1821 //TODO: remove blacklisted = yes from the config file
1823 pthread_mutex_unlock(&(mesh->mesh_mutex));
1827 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
1828 mesh->default_blacklist = blacklist;
1831 /* Hint that a hostname may be found at an address
1832 * See header file for detailed comment.
1834 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
1835 if(!mesh || !node || !addr)
1838 pthread_mutex_lock(&(mesh->mesh_mutex));
1840 char *host = NULL, *port = NULL, *str = NULL;
1841 sockaddr2str((const sockaddr_t *)addr, &host, &port);
1844 xasprintf(&str, "%s %s", host, port);
1845 if ( (strncmp ("fe80",host,4) != 0) && ( strncmp("127.",host,4) != 0 ) && ( strcmp("localhost",host) !=0 ) )
1846 append_config_file(mesh, node->name, "Address", str);
1848 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
1855 pthread_mutex_unlock(&(mesh->mesh_mutex));
1856 // @TODO do we want to fire off a connection attempt right away?
1859 /* Return an array of edges in the current network graph.
1860 * Data captures the current state and will not be updated.
1861 * Caller must deallocate data when done.
1863 meshlink_edge_t **meshlink_get_all_edges_state(meshlink_handle_t *mesh, meshlink_edge_t **edges, size_t *nmemb) {
1864 if(!mesh || !nmemb || (*nmemb && !edges)) {
1865 meshlink_errno = MESHLINK_EINVAL;
1869 pthread_mutex_lock(&(mesh->mesh_mutex));
1871 meshlink_edge_t **result = NULL;
1872 meshlink_edge_t *copy = NULL;
1873 int result_size = 0;
1875 result_size = mesh->edges->count;
1877 // if result is smaller than edges, we have to dealloc all the excess meshlink_edge_t
1878 if(result_size > *nmemb) {
1879 result = realloc(edges, result_size * sizeof (meshlink_edge_t*));
1885 meshlink_edge_t **p = result;
1887 for splay_each(edge_t, e, mesh->edges) {
1888 // skip edges that do not represent a two-directional connection
1889 if((!e->reverse) || (e->reverse->to != e->from)) {
1894 // the first *nmemb members of result can be re-used
1896 copy = xzalloc(sizeof *copy);
1901 copy->from = (meshlink_node_t*)e->from;
1902 copy->to = (meshlink_node_t*)e->to;
1903 copy->address = e->address.storage;
1904 copy->options = e->options;
1905 copy->weight = e->weight;
1908 // shrink result to the actual amount of memory used
1909 for(int i = *nmemb; i > result_size; i--) {
1910 free(result[i - 1]);
1912 result = realloc(result, result_size * sizeof (meshlink_edge_t*));
1913 *nmemb = result_size;
1917 meshlink_errno = MESHLINK_ENOMEM;
1920 pthread_mutex_unlock(&(mesh->mesh_mutex));
1925 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
1930 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
1931 meshlink_channel_t *channel = connection->priv;
1934 node_t *n = channel->node;
1935 meshlink_handle_t *mesh = n->mesh;
1936 if(!channel->receive_cb)
1939 channel->receive_cb(mesh, channel, data, len);
1944 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
1945 node_t *n = utcp_connection->utcp->priv;
1948 meshlink_handle_t *mesh = n->mesh;
1949 if(!mesh->channel_accept_cb)
1951 meshlink_channel_t *channel = xzalloc(sizeof *channel);
1953 channel->c = utcp_connection;
1954 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0))
1955 utcp_accept(utcp_connection, channel_recv, channel);
1960 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
1961 node_t *n = utcp->priv;
1962 meshlink_handle_t *mesh = n->mesh;
1963 char hex[len * 2 + 1];
1964 bin2hex(data, hex, len);
1965 logger(mesh, MESHLINK_WARNING, "channel_send(%p, %p, %zu): %s\n", utcp, data, len, hex);
1966 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? len : -1;
1969 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
1970 if(!mesh || !channel) {
1971 meshlink_errno = MESHLINK_EINVAL;
1975 channel->receive_cb = cb;
1978 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
1979 node_t *n = (node_t *)source;
1982 char hex[len * 2 + 1];
1983 bin2hex(data, hex, len);
1984 logger(mesh, MESHLINK_WARNING, "channel_receive(%p, %p, %zu): %s\n", n->utcp, data, len, hex);
1985 utcp_recv(n->utcp, data, len);
1988 static void channel_poll(struct utcp_connection *connection, size_t len) {
1989 meshlink_channel_t *channel = connection->priv;
1992 node_t *n = channel->node;
1993 meshlink_handle_t *mesh = n->mesh;
1994 if(channel->poll_cb)
1995 channel->poll_cb(mesh, channel, len);
1998 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
1999 channel->poll_cb = cb;
2000 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2003 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2005 meshlink_errno = MESHLINK_EINVAL;
2009 pthread_mutex_lock(&mesh->mesh_mutex);
2010 mesh->channel_accept_cb = cb;
2011 mesh->receive_cb = channel_receive;
2012 for splay_each(node_t, n, mesh->nodes) {
2013 if(!n->utcp && n != mesh->self) {
2014 logger(mesh, MESHLINK_WARNING, "utcp_init on node %s", n->name);
2015 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2018 pthread_mutex_unlock(&mesh->mesh_mutex);
2021 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) {
2022 if(!mesh || !node) {
2023 meshlink_errno = MESHLINK_EINVAL;
2027 logger(mesh, MESHLINK_WARNING, "meshlink_channel_open(%p, %s, %u, %p, %p, %zu)\n", mesh, node->name, port, cb, data, len);
2028 node_t *n = (node_t *)node;
2030 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2031 mesh->receive_cb = channel_receive;
2033 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2037 meshlink_channel_t *channel = xzalloc(sizeof *channel);
2039 channel->receive_cb = cb;
2040 channel->c = utcp_connect(n->utcp, port, channel_recv, channel);
2042 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2049 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2050 if(!mesh || !channel) {
2051 meshlink_errno = MESHLINK_EINVAL;
2055 utcp_shutdown(channel->c, direction);
2058 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2059 if(!mesh || !channel) {
2060 meshlink_errno = MESHLINK_EINVAL;
2064 utcp_close(channel->c);
2068 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2069 if(!mesh || !channel) {
2070 meshlink_errno = MESHLINK_EINVAL;
2078 meshlink_errno = MESHLINK_EINVAL;
2082 // TODO: more finegrained locking.
2083 // Ideally we want to put the data into the UTCP connection's send buffer.
2084 // Then, preferrably only if there is room in the receiver window,
2085 // kick the meshlink thread to go send packets.
2087 pthread_mutex_lock(&mesh->mesh_mutex);
2088 ssize_t retval = utcp_send(channel->c, data, len);
2089 pthread_mutex_unlock(&mesh->mesh_mutex);
2092 meshlink_errno = MESHLINK_ENETWORK;
2096 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2097 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp)
2098 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2099 if(mesh->node_status_cb)
2100 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2103 static void __attribute__((constructor)) meshlink_init(void) {
2107 static void __attribute__((destructor)) meshlink_exit(void) {
2111 /// Device class traits
2112 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX +1] = {
2113 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2114 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2115 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2116 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN