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, "w");
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;
705 for splay_each(node_t, n, mesh->nodes) {
708 t = utcp_timeout(n->utcp);
709 if(t >= 0 && t < tmin)
712 struct timeval tv = {.tv_sec = t};
716 static bool meshlink_setup(meshlink_handle_t *mesh) {
717 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
718 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
719 meshlink_errno = MESHLINK_ESTORAGE;
723 char filename[PATH_MAX];
724 snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
726 if(mkdir(filename, 0777) && errno != EEXIST) {
727 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
728 meshlink_errno = MESHLINK_ESTORAGE;
732 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
734 if(!access(filename, F_OK)) {
735 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
736 meshlink_errno = MESHLINK_EEXIST;
740 FILE *f = fopen(filename, "w");
742 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
743 meshlink_errno = MESHLINK_ESTORAGE;
747 fprintf(f, "Name = %s\n", mesh->name);
750 if(!ecdsa_keygen(mesh)) {
751 meshlink_errno = MESHLINK_EINTERNAL;
760 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char* appname, dev_class_t devclass) {
761 return meshlink_open_with_size(confbase, name, appname, devclass, sizeof(meshlink_handle_t));
764 meshlink_handle_t *meshlink_open_with_size(const char *confbase, const char *name, const char* appname, dev_class_t devclass, size_t size) {
766 // Validate arguments provided by the application
767 bool usingname = false;
769 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
771 if(!confbase || !*confbase) {
772 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
773 meshlink_errno = MESHLINK_EINVAL;
777 if(!appname || !*appname) {
778 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
779 meshlink_errno = MESHLINK_EINVAL;
783 if(!name || !*name) {
784 logger(NULL, MESHLINK_ERROR, "No name given!\n");
787 else { //check name only if there is a name != NULL
789 if(!check_id(name)) {
790 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
791 meshlink_errno = MESHLINK_EINVAL;
793 } else { usingname = true;}
796 if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
797 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
798 meshlink_errno = MESHLINK_EINVAL;
802 meshlink_handle_t *mesh = xzalloc(size);
803 mesh->confbase = xstrdup(confbase);
804 mesh->appname = xstrdup(appname);
805 mesh->devclass = devclass;
806 if (usingname) mesh->name = xstrdup(name);
809 pthread_mutexattr_t attr;
810 pthread_mutexattr_init(&attr);
811 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
812 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
814 mesh->threadstarted = false;
815 event_loop_init(&mesh->loop);
816 mesh->loop.data = mesh;
818 // Check whether meshlink.conf already exists
820 char filename[PATH_MAX];
821 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
823 if(access(filename, R_OK)) {
824 if(errno == ENOENT) {
826 if(!meshlink_setup(mesh)) {
827 // meshlink_errno is set by meshlink_setup()
831 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
832 meshlink_close(mesh);
833 meshlink_errno = MESHLINK_ESTORAGE;
838 // Read the configuration
840 init_configuration(&mesh->config);
842 if(!read_server_config(mesh)) {
843 meshlink_close(mesh);
844 meshlink_errno = MESHLINK_ESTORAGE;
849 struct WSAData wsa_state;
850 WSAStartup(MAKEWORD(2, 2), &wsa_state);
853 // Setup up everything
854 // TODO: we should not open listening sockets yet
856 if(!setup_network(mesh)) {
857 meshlink_close(mesh);
858 meshlink_errno = MESHLINK_ENETWORK;
862 idle_set(&mesh->loop, idle, mesh);
864 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
868 static void *meshlink_main_loop(void *arg) {
869 meshlink_handle_t *mesh = arg;
871 pthread_mutex_lock(&(mesh->mesh_mutex));
873 try_outgoing_connections(mesh);
875 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
877 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
879 pthread_mutex_unlock(&(mesh->mesh_mutex));
883 bool meshlink_start(meshlink_handle_t *mesh) {
885 meshlink_errno = MESHLINK_EINVAL;
888 pthread_mutex_lock(&(mesh->mesh_mutex));
890 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
892 mesh->thedatalen = 0;
894 // TODO: open listening sockets first
896 //Check that a valid name is set
898 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
899 meshlink_errno = MESHLINK_EINVAL;
900 pthread_mutex_unlock(&(mesh->mesh_mutex));
904 // Start the main thread
906 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
907 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
908 memset(&mesh->thread, 0, sizeof mesh->thread);
909 meshlink_errno = MESHLINK_EINTERNAL;
910 pthread_mutex_unlock(&(mesh->mesh_mutex));
914 mesh->threadstarted=true;
916 discovery_start(mesh);
918 pthread_mutex_unlock(&(mesh->mesh_mutex));
922 void meshlink_stop(meshlink_handle_t *mesh) {
924 meshlink_errno = MESHLINK_EINVAL;
928 pthread_mutex_lock(&(mesh->mesh_mutex));
929 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
932 discovery_stop(mesh);
934 // Shut down a listening socket to signal the main thread to shut down
936 listen_socket_t *s = &mesh->listen_socket[0];
937 shutdown(s->tcp.fd, SHUT_RDWR);
939 // Wait for the main thread to finish
940 pthread_mutex_unlock(&(mesh->mesh_mutex));
941 pthread_join(mesh->thread, NULL);
942 pthread_mutex_lock(&(mesh->mesh_mutex));
944 mesh->threadstarted = false;
948 closesocket(s->tcp.fd);
949 io_del(&mesh->loop, &s->tcp);
950 s->tcp.fd = setup_listen_socket(&s->sa);
952 logger(mesh, MESHLINK_ERROR, "Could not repair listenen socket!");
954 io_add(&mesh->loop, &s->tcp, handle_new_meta_connection, s, s->tcp.fd, IO_READ);
956 pthread_mutex_unlock(&(mesh->mesh_mutex));
959 void meshlink_close(meshlink_handle_t *mesh) {
960 if(!mesh || !mesh->confbase) {
961 meshlink_errno = MESHLINK_EINVAL;
965 // lock is not released after this
966 pthread_mutex_lock(&(mesh->mesh_mutex));
968 // Close and free all resources used.
970 close_network_connections(mesh);
972 logger(mesh, MESHLINK_INFO, "Terminating");
974 exit_configuration(&mesh->config);
975 event_loop_exit(&mesh->loop);
982 ecdsa_free(mesh->invitation_key);
986 free(mesh->confbase);
987 pthread_mutex_destroy(&(mesh->mesh_mutex));
989 memset(mesh, 0, sizeof *mesh);
994 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
996 meshlink_errno = MESHLINK_EINVAL;
1000 pthread_mutex_lock(&(mesh->mesh_mutex));
1001 mesh->receive_cb = cb;
1002 pthread_mutex_unlock(&(mesh->mesh_mutex));
1005 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1007 meshlink_errno = MESHLINK_EINVAL;
1011 pthread_mutex_lock(&(mesh->mesh_mutex));
1012 mesh->node_status_cb = cb;
1013 pthread_mutex_unlock(&(mesh->mesh_mutex));
1016 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1018 pthread_mutex_lock(&(mesh->mesh_mutex));
1020 mesh->log_level = cb ? level : 0;
1021 pthread_mutex_unlock(&(mesh->mesh_mutex));
1024 global_log_level = cb ? level : 0;
1028 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1029 meshlink_packethdr_t *hdr;
1031 // Validate arguments
1032 if(!mesh || !destination || len >= MAXSIZE - sizeof *hdr) {
1033 meshlink_errno = MESHLINK_EINVAL;
1041 meshlink_errno = MESHLINK_EINVAL;
1045 // Prepare the packet
1046 vpn_packet_t *packet = malloc(sizeof *packet);
1048 meshlink_errno = MESHLINK_ENOMEM;
1052 packet->probe = false;
1053 packet->tcp = false;
1054 packet->len = len + sizeof *hdr;
1056 hdr = (meshlink_packethdr_t *)packet->data;
1057 memset(hdr, 0, sizeof *hdr);
1058 memcpy(hdr->destination, destination->name, sizeof hdr->destination);
1059 memcpy(hdr->source, mesh->self->name, sizeof hdr->source);
1061 memcpy(packet->data + sizeof *hdr, data, len);
1064 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1066 meshlink_errno = MESHLINK_ENOMEM;
1070 // Notify event loop
1071 signal_trigger(&(mesh->loop),&(mesh->datafromapp));
1076 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1077 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1081 mesh->self->in_packets++;
1082 mesh->self->in_bytes += packet->len;
1083 route(mesh, mesh->self, packet);
1086 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1087 if(!mesh || !destination) {
1088 meshlink_errno = MESHLINK_EINVAL;
1091 pthread_mutex_lock(&(mesh->mesh_mutex));
1093 node_t *n = (node_t *)destination;
1094 if(!n->status.reachable) {
1095 pthread_mutex_unlock(&(mesh->mesh_mutex));
1099 else if(n->mtuprobes > 30 && n->minmtu) {
1100 pthread_mutex_unlock(&(mesh->mesh_mutex));
1104 pthread_mutex_unlock(&(mesh->mesh_mutex));
1109 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1110 if(!mesh || !node) {
1111 meshlink_errno = MESHLINK_EINVAL;
1114 pthread_mutex_lock(&(mesh->mesh_mutex));
1116 node_t *n = (node_t *)node;
1118 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1119 meshlink_errno = MESHLINK_EINTERNAL;
1120 pthread_mutex_unlock(&(mesh->mesh_mutex));
1124 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1127 meshlink_errno = MESHLINK_EINTERNAL;
1129 pthread_mutex_unlock(&(mesh->mesh_mutex));
1133 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1134 if(!mesh || !name) {
1135 meshlink_errno = MESHLINK_EINVAL;
1139 meshlink_node_t *node = NULL;
1141 pthread_mutex_lock(&(mesh->mesh_mutex));
1142 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1143 pthread_mutex_unlock(&(mesh->mesh_mutex));
1147 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1148 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1149 meshlink_errno = MESHLINK_EINVAL;
1153 meshlink_node_t **result;
1156 pthread_mutex_lock(&(mesh->mesh_mutex));
1158 *nmemb = mesh->nodes->count;
1159 result = realloc(nodes, *nmemb * sizeof *nodes);
1162 meshlink_node_t **p = result;
1163 for splay_each(node_t, n, mesh->nodes)
1164 *p++ = (meshlink_node_t *)n;
1168 meshlink_errno = MESHLINK_ENOMEM;
1171 pthread_mutex_unlock(&(mesh->mesh_mutex));
1176 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1177 if(!mesh || !data || !len || !signature || !siglen) {
1178 meshlink_errno = MESHLINK_EINVAL;
1182 if(*siglen < MESHLINK_SIGLEN) {
1183 meshlink_errno = MESHLINK_EINVAL;
1187 pthread_mutex_lock(&(mesh->mesh_mutex));
1189 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1190 meshlink_errno = MESHLINK_EINTERNAL;
1191 pthread_mutex_unlock(&(mesh->mesh_mutex));
1195 *siglen = MESHLINK_SIGLEN;
1196 pthread_mutex_unlock(&(mesh->mesh_mutex));
1200 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1201 if(!mesh || !data || !len || !signature) {
1202 meshlink_errno = MESHLINK_EINVAL;
1206 if(siglen != MESHLINK_SIGLEN) {
1207 meshlink_errno = MESHLINK_EINVAL;
1211 pthread_mutex_lock(&(mesh->mesh_mutex));
1215 struct node_t *n = (struct node_t *)source;
1216 node_read_ecdsa_public_key(mesh, n);
1218 meshlink_errno = MESHLINK_EINTERNAL;
1221 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1223 pthread_mutex_unlock(&(mesh->mesh_mutex));
1227 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1228 char filename[PATH_MAX];
1230 pthread_mutex_lock(&(mesh->mesh_mutex));
1232 snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
1233 if(mkdir(filename, 0700) && errno != EEXIST) {
1234 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1235 meshlink_errno = MESHLINK_ESTORAGE;
1236 pthread_mutex_unlock(&(mesh->mesh_mutex));
1240 // Count the number of valid invitations, clean up old ones
1241 DIR *dir = opendir(filename);
1243 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1244 meshlink_errno = MESHLINK_ESTORAGE;
1245 pthread_mutex_unlock(&(mesh->mesh_mutex));
1252 time_t deadline = time(NULL) - 604800; // 1 week in the past
1254 while((ent = readdir(dir))) {
1255 if(strlen(ent->d_name) != 24)
1257 char invname[PATH_MAX];
1259 snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
1260 if(!stat(invname, &st)) {
1261 if(mesh->invitation_key && deadline < st.st_mtime)
1266 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1272 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1274 meshlink_errno = MESHLINK_ESTORAGE;
1275 pthread_mutex_unlock(&(mesh->mesh_mutex));
1281 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1283 // Remove the key if there are no outstanding invitations.
1286 if(mesh->invitation_key) {
1287 ecdsa_free(mesh->invitation_key);
1288 mesh->invitation_key = NULL;
1292 if(mesh->invitation_key) {
1293 pthread_mutex_unlock(&(mesh->mesh_mutex));
1297 // Create a new key if necessary.
1298 FILE *f = fopen(filename, "r");
1300 if(errno != ENOENT) {
1301 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1302 meshlink_errno = MESHLINK_ESTORAGE;
1303 pthread_mutex_unlock(&(mesh->mesh_mutex));
1307 mesh->invitation_key = ecdsa_generate();
1308 if(!mesh->invitation_key) {
1309 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1310 meshlink_errno = MESHLINK_EINTERNAL;
1311 pthread_mutex_unlock(&(mesh->mesh_mutex));
1314 f = fopen(filename, "w");
1316 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1317 meshlink_errno = MESHLINK_ESTORAGE;
1318 pthread_mutex_unlock(&(mesh->mesh_mutex));
1321 chmod(filename, 0600);
1322 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1325 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1327 if(!mesh->invitation_key) {
1328 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1329 meshlink_errno = MESHLINK_ESTORAGE;
1333 pthread_mutex_unlock(&(mesh->mesh_mutex));
1334 return mesh->invitation_key;
1337 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1338 if(!mesh || !address) {
1339 meshlink_errno = MESHLINK_EINVAL;
1345 pthread_mutex_lock(&(mesh->mesh_mutex));
1347 for(const char *p = address; *p; p++) {
1348 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')
1350 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1351 meshlink_errno = MESHLINK_EINVAL;
1352 pthread_mutex_unlock(&(mesh->mesh_mutex));
1356 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1357 pthread_mutex_unlock(&(mesh->mesh_mutex));
1361 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1363 meshlink_errno = MESHLINK_EINVAL;
1367 pthread_mutex_lock(&(mesh->mesh_mutex));
1369 // Check validity of the new node's name
1370 if(!check_id(name)) {
1371 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1372 meshlink_errno = MESHLINK_EINVAL;
1373 pthread_mutex_unlock(&(mesh->mesh_mutex));
1377 // Ensure no host configuration file with that name exists
1378 char filename[PATH_MAX];
1379 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1380 if(!access(filename, F_OK)) {
1381 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1382 meshlink_errno = MESHLINK_EEXIST;
1383 pthread_mutex_unlock(&(mesh->mesh_mutex));
1387 // Ensure no other nodes know about this name
1388 if(meshlink_get_node(mesh, name)) {
1389 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1390 meshlink_errno = MESHLINK_EEXIST;
1391 pthread_mutex_unlock(&(mesh->mesh_mutex));
1395 // Get the local address
1396 char *address = get_my_hostname(mesh);
1398 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1399 meshlink_errno = MESHLINK_ERESOLV;
1400 pthread_mutex_unlock(&(mesh->mesh_mutex));
1404 if(!refresh_invitation_key(mesh)) {
1405 meshlink_errno = MESHLINK_EINTERNAL;
1406 pthread_mutex_unlock(&(mesh->mesh_mutex));
1412 // Create a hash of the key.
1413 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1414 sha512(fingerprint, strlen(fingerprint), hash);
1415 b64encode_urlsafe(hash, hash, 18);
1417 // Create a random cookie for this invitation.
1419 randomize(cookie, 18);
1421 // Create a filename that doesn't reveal the cookie itself
1422 char buf[18 + strlen(fingerprint)];
1423 char cookiehash[64];
1424 memcpy(buf, cookie, 18);
1425 memcpy(buf + 18, fingerprint, sizeof buf - 18);
1426 sha512(buf, sizeof buf, cookiehash);
1427 b64encode_urlsafe(cookiehash, cookiehash, 18);
1429 b64encode_urlsafe(cookie, cookie, 18);
1433 // Create a file containing the details of the invitation.
1434 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1435 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1437 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1438 meshlink_errno = MESHLINK_ESTORAGE;
1439 pthread_mutex_unlock(&(mesh->mesh_mutex));
1442 FILE *f = fdopen(ifd, "w");
1446 // Fill in the details.
1447 fprintf(f, "Name = %s\n", name);
1449 // fprintf(f, "NetName = %s\n", netname);
1450 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1452 // Copy Broadcast and Mode
1453 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
1454 FILE *tc = fopen(filename, "r");
1457 while(fgets(buf, sizeof buf, tc)) {
1458 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1459 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1461 // Make sure there is a newline character.
1462 if(!strchr(buf, '\n'))
1468 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1469 meshlink_errno = MESHLINK_ESTORAGE;
1470 pthread_mutex_unlock(&(mesh->mesh_mutex));
1474 fprintf(f, "#---------------------------------------------------------------#\n");
1475 fprintf(f, "Name = %s\n", mesh->self->name);
1477 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1481 // Create an URL from the local address, key hash and cookie
1483 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1486 pthread_mutex_unlock(&(mesh->mesh_mutex));
1490 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1491 if(!mesh || !invitation) {
1492 meshlink_errno = MESHLINK_EINVAL;
1496 pthread_mutex_lock(&(mesh->mesh_mutex));
1498 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
1499 char copy[strlen(invitation) + 1];
1500 strcpy(copy, invitation);
1502 // Split the invitation URL into hostname, port, key hash and cookie.
1504 char *slash = strchr(copy, '/');
1510 if(strlen(slash) != 48)
1513 char *address = copy;
1515 if(*address == '[') {
1517 char *bracket = strchr(address, ']');
1521 if(bracket[1] == ':')
1524 port = strchr(address, ':');
1532 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
1535 // Generate a throw-away key for the invitation.
1536 ecdsa_t *key = ecdsa_generate();
1538 meshlink_errno = MESHLINK_EINTERNAL;
1539 pthread_mutex_unlock(&(mesh->mesh_mutex));
1543 char *b64key = ecdsa_get_base64_public_key(key);
1545 //Before doing meshlink_join make sure we are not connected to another mesh
1546 if ( mesh->threadstarted ){
1550 // Connect to the meshlink daemon mentioned in the URL.
1551 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
1553 meshlink_errno = MESHLINK_ERESOLV;
1554 pthread_mutex_unlock(&(mesh->mesh_mutex));
1558 mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1559 if(mesh->sock <= 0) {
1560 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
1562 meshlink_errno = MESHLINK_ENETWORK;
1563 pthread_mutex_unlock(&(mesh->mesh_mutex));
1567 if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
1568 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
1569 closesocket(mesh->sock);
1571 meshlink_errno = MESHLINK_ENETWORK;
1572 pthread_mutex_unlock(&(mesh->mesh_mutex));
1578 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
1580 // Tell him we have an invitation, and give him our throw-away key.
1584 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
1585 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
1586 closesocket(mesh->sock);
1587 meshlink_errno = MESHLINK_ENETWORK;
1588 pthread_mutex_unlock(&(mesh->mesh_mutex));
1594 char hisname[4096] = "";
1595 int code, hismajor, hisminor = 0;
1597 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) {
1598 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
1599 closesocket(mesh->sock);
1600 meshlink_errno = MESHLINK_ENETWORK;
1601 pthread_mutex_unlock(&(mesh->mesh_mutex));
1605 // Check if the hash of the key he gave us matches the hash in the URL.
1606 char *fingerprint = mesh->line + 2;
1608 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
1609 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
1610 meshlink_errno = MESHLINK_EINTERNAL;
1611 pthread_mutex_unlock(&(mesh->mesh_mutex));
1614 if(memcmp(hishash, mesh->hash, 18)) {
1615 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
1616 meshlink_errno = MESHLINK_EPEER;
1617 pthread_mutex_unlock(&(mesh->mesh_mutex));
1622 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
1624 meshlink_errno = MESHLINK_EINTERNAL;
1625 pthread_mutex_unlock(&(mesh->mesh_mutex));
1629 // Start an SPTPS session
1630 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, "meshlink invitation", 15, invitation_send, invitation_receive)) {
1631 meshlink_errno = MESHLINK_EINTERNAL;
1632 pthread_mutex_unlock(&(mesh->mesh_mutex));
1636 // Feed rest of input buffer to SPTPS
1637 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
1638 meshlink_errno = MESHLINK_EPEER;
1639 pthread_mutex_unlock(&(mesh->mesh_mutex));
1645 while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
1649 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
1650 meshlink_errno = MESHLINK_ENETWORK;
1651 pthread_mutex_unlock(&(mesh->mesh_mutex));
1655 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
1656 meshlink_errno = MESHLINK_EPEER;
1657 pthread_mutex_unlock(&(mesh->mesh_mutex));
1662 sptps_stop(&mesh->sptps);
1665 closesocket(mesh->sock);
1667 if(!mesh->success) {
1668 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
1669 meshlink_errno = MESHLINK_EPEER;
1670 pthread_mutex_unlock(&(mesh->mesh_mutex));
1674 pthread_mutex_unlock(&(mesh->mesh_mutex));
1678 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL or you are already connected to a Mesh ?\n");
1679 meshlink_errno = MESHLINK_EINVAL;
1680 pthread_mutex_unlock(&(mesh->mesh_mutex));
1684 char *meshlink_export(meshlink_handle_t *mesh) {
1686 meshlink_errno = MESHLINK_EINVAL;
1690 pthread_mutex_lock(&(mesh->mesh_mutex));
1692 char filename[PATH_MAX];
1693 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1694 FILE *f = fopen(filename, "r");
1696 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
1697 meshlink_errno = MESHLINK_ESTORAGE;
1698 pthread_mutex_unlock(&(mesh->mesh_mutex));
1702 fseek(f, 0, SEEK_END);
1703 int fsize = ftell(f);
1706 size_t len = fsize + 9 + strlen(mesh->self->name);
1707 char *buf = xmalloc(len);
1708 snprintf(buf, len, "Name = %s\n", mesh->self->name);
1709 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
1710 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
1712 meshlink_errno = MESHLINK_ESTORAGE;
1713 pthread_mutex_unlock(&(mesh->mesh_mutex));
1720 pthread_mutex_unlock(&(mesh->mesh_mutex));
1724 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
1725 if(!mesh || !data) {
1726 meshlink_errno = MESHLINK_EINVAL;
1730 pthread_mutex_lock(&(mesh->mesh_mutex));
1732 if(strncmp(data, "Name = ", 7)) {
1733 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1734 meshlink_errno = MESHLINK_EPEER;
1735 pthread_mutex_unlock(&(mesh->mesh_mutex));
1739 char *end = strchr(data + 7, '\n');
1741 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1742 meshlink_errno = MESHLINK_EPEER;
1743 pthread_mutex_unlock(&(mesh->mesh_mutex));
1747 int len = end - (data + 7);
1749 memcpy(name, data + 7, len);
1751 if(!check_id(name)) {
1752 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
1753 meshlink_errno = MESHLINK_EPEER;
1754 pthread_mutex_unlock(&(mesh->mesh_mutex));
1758 char filename[PATH_MAX];
1759 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1760 if(!access(filename, F_OK)) {
1761 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
1762 meshlink_errno = MESHLINK_EEXIST;
1763 pthread_mutex_unlock(&(mesh->mesh_mutex));
1767 if(errno != ENOENT) {
1768 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
1769 meshlink_errno = MESHLINK_ESTORAGE;
1770 pthread_mutex_unlock(&(mesh->mesh_mutex));
1774 FILE *f = fopen(filename, "w");
1776 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1777 meshlink_errno = MESHLINK_ESTORAGE;
1778 pthread_mutex_unlock(&(mesh->mesh_mutex));
1782 fwrite(end + 1, strlen(end + 1), 1, f);
1785 load_all_nodes(mesh);
1787 pthread_mutex_unlock(&(mesh->mesh_mutex));
1791 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1792 if(!mesh || !node) {
1793 meshlink_errno = MESHLINK_EINVAL;
1797 pthread_mutex_lock(&(mesh->mesh_mutex));
1801 n->status.blacklisted=true;
1802 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name);
1804 //Make blacklisting persistent in the config file
1805 append_config_file(mesh, n->name, "blacklisted", "yes");
1807 pthread_mutex_unlock(&(mesh->mesh_mutex));
1811 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
1812 if(!mesh || !node) {
1813 meshlink_errno = MESHLINK_EINVAL;
1817 pthread_mutex_lock(&(mesh->mesh_mutex));
1819 node_t *n = (node_t *)node;
1820 n->status.blacklisted = false;
1822 //TODO: remove blacklisted = yes from the config file
1824 pthread_mutex_unlock(&(mesh->mesh_mutex));
1828 /* Hint that a hostname may be found at an address
1829 * See header file for detailed comment.
1831 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
1832 if(!mesh || !node || !addr)
1835 pthread_mutex_lock(&(mesh->mesh_mutex));
1837 char *host = NULL, *port = NULL, *str = NULL;
1838 sockaddr2str((const sockaddr_t *)addr, &host, &port);
1841 xasprintf(&str, "%s %s", host, port);
1842 if ( (strncmp ("fe80",host,4) != 0) && ( strncmp("127.",host,4) != 0 ) && ( strcmp("localhost",host) !=0 ) )
1843 append_config_file(mesh, node->name, "Address", str);
1845 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
1852 pthread_mutex_unlock(&(mesh->mesh_mutex));
1853 // @TODO do we want to fire off a connection attempt right away?
1856 /* Return an array of edges in the current network graph.
1857 * Data captures the current state and will not be updated.
1858 * Caller must deallocate data when done.
1860 meshlink_edge_t **meshlink_get_all_edges_state(meshlink_handle_t *mesh, meshlink_edge_t **edges, size_t *nmemb) {
1861 if(!mesh || !nmemb || (*nmemb && !edges)) {
1862 meshlink_errno = MESHLINK_EINVAL;
1866 pthread_mutex_lock(&(mesh->mesh_mutex));
1868 meshlink_edge_t **result = NULL;
1869 meshlink_edge_t *copy = NULL;
1870 int result_size = 0;
1872 result_size = mesh->edges->count;
1874 // if result is smaller than edges, we have to dealloc all the excess meshlink_edge_t
1875 if(result_size > *nmemb) {
1876 result = realloc(edges, result_size * sizeof (meshlink_edge_t*));
1882 meshlink_edge_t **p = result;
1884 for splay_each(edge_t, e, mesh->edges) {
1885 // skip edges that do not represent a two-directional connection
1886 if((!e->reverse) || (e->reverse->to != e->from)) {
1891 // the first *nmemb members of result can be re-used
1893 copy = xzalloc(sizeof *copy);
1898 copy->from = (meshlink_node_t*)e->from;
1899 copy->to = (meshlink_node_t*)e->to;
1900 copy->address = e->address.storage;
1901 copy->options = e->options;
1902 copy->weight = e->weight;
1905 // shrink result to the actual amount of memory used
1906 for(int i = *nmemb; i > result_size; i--) {
1907 free(result[i - 1]);
1909 result = realloc(result, result_size * sizeof (meshlink_edge_t*));
1910 *nmemb = result_size;
1914 meshlink_errno = MESHLINK_ENOMEM;
1917 pthread_mutex_unlock(&(mesh->mesh_mutex));
1922 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
1927 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
1928 meshlink_channel_t *channel = connection->priv;
1931 node_t *n = channel->node;
1932 meshlink_handle_t *mesh = n->mesh;
1933 if(!channel->receive_cb)
1936 channel->receive_cb(mesh, channel, data, len);
1941 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
1942 node_t *n = utcp_connection->utcp->priv;
1945 meshlink_handle_t *mesh = n->mesh;
1946 if(!mesh->channel_accept_cb)
1948 meshlink_channel_t *channel = xzalloc(sizeof *channel);
1950 channel->c = utcp_connection;
1951 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0))
1952 utcp_accept(utcp_connection, channel_recv, channel);
1957 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
1958 node_t *n = utcp->priv;
1959 meshlink_handle_t *mesh = n->mesh;
1960 char hex[len * 2 + 1];
1961 bin2hex(data, hex, len);
1962 logger(mesh, MESHLINK_WARNING, "channel_send(%p, %p, %zu): %s\n", utcp, data, len, hex);
1963 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? len : -1;
1966 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
1967 if(!mesh || !channel) {
1968 meshlink_errno = MESHLINK_EINVAL;
1972 channel->receive_cb = cb;
1975 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
1976 node_t *n = (node_t *)source;
1979 char hex[len * 2 + 1];
1980 bin2hex(data, hex, len);
1981 logger(mesh, MESHLINK_WARNING, "channel_receive(%p, %p, %zu): %s\n", n->utcp, data, len, hex);
1982 utcp_recv(n->utcp, data, len);
1985 static void channel_poll(struct utcp_connection *connection, size_t len) {
1986 meshlink_channel_t *channel = connection->priv;
1989 node_t *n = channel->node;
1990 meshlink_handle_t *mesh = n->mesh;
1991 if(channel->poll_cb)
1992 channel->poll_cb(mesh, channel, len);
1995 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
1996 channel->poll_cb = cb;
1997 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2000 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2002 meshlink_errno = MESHLINK_EINVAL;
2006 pthread_mutex_lock(&mesh->mesh_mutex);
2007 mesh->channel_accept_cb = cb;
2008 mesh->receive_cb = channel_receive;
2009 for splay_each(node_t, n, mesh->nodes) {
2010 if(!n->utcp && n != mesh->self) {
2011 logger(mesh, MESHLINK_WARNING, "utcp_init on node %s", n->name);
2012 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2015 pthread_mutex_unlock(&mesh->mesh_mutex);
2018 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) {
2019 if(!mesh || !node) {
2020 meshlink_errno = MESHLINK_EINVAL;
2024 logger(mesh, MESHLINK_WARNING, "meshlink_channel_open(%p, %s, %u, %p, %p, %zu)\n", mesh, node->name, port, cb, data, len);
2025 node_t *n = (node_t *)node;
2027 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2028 mesh->receive_cb = channel_receive;
2030 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2034 meshlink_channel_t *channel = xzalloc(sizeof *channel);
2036 channel->receive_cb = cb;
2037 channel->c = utcp_connect(n->utcp, port, channel_recv, channel);
2039 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2046 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2047 if(!mesh || !channel) {
2048 meshlink_errno = MESHLINK_EINVAL;
2052 utcp_shutdown(channel->c, direction);
2055 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2056 if(!mesh || !channel) {
2057 meshlink_errno = MESHLINK_EINVAL;
2061 utcp_close(channel->c);
2065 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2066 if(!mesh || !channel) {
2067 meshlink_errno = MESHLINK_EINVAL;
2075 meshlink_errno = MESHLINK_EINVAL;
2079 // TODO: more finegrained locking.
2080 // Ideally we want to put the data into the UTCP connection's send buffer.
2081 // Then, preferrably only if there is room in the receiver window,
2082 // kick the meshlink thread to go send packets.
2084 pthread_mutex_lock(&mesh->mesh_mutex);
2085 ssize_t retval = utcp_send(channel->c, data, len);
2086 pthread_mutex_unlock(&mesh->mesh_mutex);
2089 meshlink_errno = MESHLINK_ENETWORK;
2093 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2094 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp)
2095 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2096 if(mesh->node_status_cb)
2097 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2100 static void __attribute__((constructor)) meshlink_init(void) {
2104 static void __attribute__((destructor)) meshlink_exit(void) {
2108 /// Device class traits
2109 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX +1] = {
2110 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2111 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2112 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2113 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN