2 meshlink.c -- Implementation of the MeshLink API.
3 Copyright (C) 2014, 2017 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 #define VAR_SERVER 1 /* Should be in meshlink.conf */
20 #define VAR_HOST 2 /* Can be in host config file */
21 #define VAR_MULTIPLE 4 /* Multiple statements allowed */
22 #define VAR_OBSOLETE 8 /* Should not be used anymore */
23 #define VAR_SAFE 16 /* Variable is safe when accepting invitations */
24 #define MAX_ADDRESS_LENGTH 45 /* Max length of an (IPv6) address */
25 #define MAX_PORT_LENGTH 5 /* 0-65535 */
37 #include "meshlink_internal.h"
45 #include "ed25519/sha512.h"
46 #include "discovery.h"
49 #define MSG_NOSIGNAL 0
52 __thread meshlink_errno_t meshlink_errno;
53 meshlink_log_cb_t global_log_cb;
54 meshlink_log_level_t global_log_level;
56 //TODO: this can go away completely
57 const var_t variables[] = {
58 /* Server configuration */
59 {"AddressFamily", VAR_SERVER},
60 {"AutoConnect", VAR_SERVER | VAR_SAFE},
61 {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
62 {"BindToInterface", VAR_SERVER},
63 {"Broadcast", VAR_SERVER | VAR_SAFE},
64 {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
65 {"DecrementTTL", VAR_SERVER},
66 {"Device", VAR_SERVER},
67 {"DeviceType", VAR_SERVER},
68 {"DirectOnly", VAR_SERVER},
69 {"ECDSAPrivateKeyFile", VAR_SERVER},
70 {"ExperimentalProtocol", VAR_SERVER},
71 {"Forwarding", VAR_SERVER},
72 {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
73 {"Hostnames", VAR_SERVER},
74 {"IffOneQueue", VAR_SERVER},
75 {"Interface", VAR_SERVER},
76 {"KeyExpire", VAR_SERVER},
77 {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
78 {"LocalDiscovery", VAR_SERVER},
79 {"MACExpire", VAR_SERVER},
80 {"MaxConnectionBurst", VAR_SERVER},
81 {"MaxOutputBufferSize", VAR_SERVER},
82 {"MaxTimeout", VAR_SERVER},
83 {"Mode", VAR_SERVER | VAR_SAFE},
85 {"PingInterval", VAR_SERVER},
86 {"PingTimeout", VAR_SERVER},
87 {"PriorityInheritance", VAR_SERVER},
88 {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
89 {"PrivateKeyFile", VAR_SERVER},
90 {"ProcessPriority", VAR_SERVER},
91 {"Proxy", VAR_SERVER},
92 {"ReplayWindow", VAR_SERVER},
93 {"ScriptsExtension", VAR_SERVER},
94 {"ScriptsInterpreter", VAR_SERVER},
95 {"StrictSubnets", VAR_SERVER},
96 {"TunnelServer", VAR_SERVER},
97 {"VDEGroup", VAR_SERVER},
98 {"VDEPort", VAR_SERVER},
99 /* Host configuration */
100 {"Address", VAR_HOST | VAR_MULTIPLE},
101 {"Cipher", VAR_SERVER | VAR_HOST},
102 {"ClampMSS", VAR_SERVER | VAR_HOST},
103 {"Compression", VAR_SERVER | VAR_HOST},
104 {"Digest", VAR_SERVER | VAR_HOST},
105 {"ECDSAPublicKey", VAR_HOST},
106 {"ECDSAPublicKeyFile", VAR_SERVER | VAR_HOST},
107 {"IndirectData", VAR_SERVER | VAR_HOST},
108 {"MACLength", VAR_SERVER | VAR_HOST},
109 {"PMTU", VAR_SERVER | VAR_HOST},
110 {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
112 {"PublicKey", VAR_HOST | VAR_OBSOLETE},
113 {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
114 {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
115 {"TCPOnly", VAR_SERVER | VAR_HOST},
116 {"Weight", VAR_HOST | VAR_SAFE},
120 static bool fcopy(FILE *out, const char *filename) {
121 FILE *in = fopen(filename, "r");
123 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
129 while((len = fread(buf, 1, sizeof buf, in)))
130 fwrite(buf, len, 1, out);
135 static int rstrip(char *value) {
136 int len = strlen(value);
137 while(len && strchr("\t\r\n ", value[len - 1]))
142 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
144 if(!filename || (*hostname && *port))
147 FILE *f = fopen(filename, "r");
151 while(fgets(line, sizeof line, f)) {
155 p += strcspn(p, "\t =");
158 q = p + strspn(p, "\t ");
160 q += 1 + strspn(q + 1, "\t ");
162 p = q + strcspn(q, "\t ");
165 p += strspn(p, "\t ");
166 p[strcspn(p, "\t ")] = 0;
168 if(!*port && !strcasecmp(line, "Port")) {
170 } else if(!*hostname && !strcasecmp(line, "Address")) {
171 *hostname = xstrdup(q);
178 if(*hostname && *port)
185 static bool is_valid_hostname(const char *hostname) {
186 for(const char *p = hostname; *p; p++) {
187 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':'))
194 static void set_timeout(int sock, int timeout) {
199 tv.tv_sec = timeout / 1000;
200 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
202 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);
203 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof tv);
206 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
207 char *hostname = NULL;
209 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
210 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
211 struct addrinfo *aip = ai;
212 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
216 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
218 set_timeout(s, 5000);
219 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
225 send(s, request, sizeof request - 1, 0);
226 int len = recv(s, line, sizeof line - 1, MSG_WAITALL);
229 if(line[len - 1] == '\n')
231 char *p = strrchr(line, '\n');
233 hostname = xstrdup(p + 1);
246 // Check that the hostname is reasonable
247 if(hostname && !is_valid_hostname(hostname)) {
253 meshlink_errno = MESHLINK_ERESOLV;
258 static char *get_my_hostname(meshlink_handle_t* mesh) {
259 char *hostname = NULL;
261 char *hostport = NULL;
262 char *name = mesh->self->name;
263 char filename[PATH_MAX] = "";
266 // Use first Address statement in own host config file
267 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
268 scan_for_hostname(filename, &hostname, &port);
273 hostname = meshlink_get_external_address(mesh);
277 f = fopen(filename, "a");
279 fprintf(f, "\nAddress = %s\n", hostname);
282 logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
287 if(strchr(hostname, ':'))
288 xasprintf(&hostport, "[%s]:%s", hostname, port);
290 xasprintf(&hostport, "%s:%s", hostname, port);
292 if(strchr(hostname, ':'))
293 xasprintf(&hostport, "[%s]", hostname);
295 hostport = xstrdup(hostname);
303 static char *get_line(const char **data) {
312 static char line[1024];
313 const char *end = strchr(*data, '\n');
314 size_t len = end ? end - *data : strlen(*data);
315 if(len >= sizeof line) {
316 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
319 if(len && !isprint(**data))
322 memcpy(line, *data, len);
333 static char *get_value(const char *data, const char *var) {
334 char *line = get_line(&data);
338 char *sep = line + strcspn(line, " \t=");
339 char *val = sep + strspn(sep, " \t");
341 val += 1 + strspn(val + 1, " \t");
343 if(strcasecmp(line, var))
348 static bool try_bind(int port) {
349 struct addrinfo *ai = NULL;
350 struct addrinfo hint = {
351 .ai_flags = AI_PASSIVE,
352 .ai_family = AF_UNSPEC,
353 .ai_socktype = SOCK_STREAM,
354 .ai_protocol = IPPROTO_TCP,
358 snprintf(portstr, sizeof portstr, "%d", port);
360 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
364 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
369 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
382 static int check_port(meshlink_handle_t *mesh) {
383 for(int i = 0; i < 1000; i++) {
384 int port = 0x1000 + (rand() & 0x7fff);
386 char filename[PATH_MAX];
387 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
388 FILE *f = fopen(filename, "a");
390 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
394 fprintf(f, "Port = %d\n", port);
400 logger(mesh, MESHLINK_DEBUG, "Please change MeshLink's Port manually.\n");
404 static bool finalize_join(meshlink_handle_t *mesh) {
405 char *name = xstrdup(get_value(mesh->data, "Name"));
407 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
411 if(!check_id(name)) {
412 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
416 char filename[PATH_MAX];
417 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
419 FILE *f = fopen(filename, "w");
421 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
425 fprintf(f, "Name = %s\n", name);
427 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
428 FILE *fh = fopen(filename, "w");
430 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
435 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
436 // Other chunks go unfiltered to their respective host config files
437 const char *p = mesh->data;
440 while((l = get_line(&p))) {
445 // Split line into variable and value
446 int len = strcspn(l, "\t =");
448 value += strspn(value, "\t ");
451 value += strspn(value, "\t ");
456 if(!strcasecmp(l, "Name"))
457 if(strcmp(value, name))
461 else if(!strcasecmp(l, "NetName"))
464 // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
467 for(i = 0; variables[i].name; i++) {
468 if(strcasecmp(l, variables[i].name))
474 // Ignore unknown and unsafe variables
476 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
478 } else if(!(variables[i].type & VAR_SAFE)) {
479 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
483 // Copy the safe variable to the right config file
484 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
489 while(l && !strcasecmp(l, "Name")) {
490 if(!check_id(value)) {
491 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
495 if(!strcmp(value, name)) {
496 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
500 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
501 f = fopen(filename, "w");
504 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
508 while((l = get_line(&p))) {
509 if(!strcmp(l, "#---------------------------------------------------------------#"))
511 int len = strcspn(l, "\t =");
512 if(len == 4 && !strncasecmp(l, "Name", 4)) {
514 value += strspn(value, "\t ");
517 value += strspn(value, "\t ");
530 char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
536 fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
537 fprintf(fh, "Port = %s\n", mesh->myport);
541 sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
544 free(mesh->self->name);
545 free(mesh->self->connection->name);
546 mesh->self->name = xstrdup(name);
547 mesh->self->connection->name = name;
549 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
551 load_all_nodes(mesh);
556 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
557 meshlink_handle_t* mesh = handle;
559 int result = send(mesh->sock, data, len, 0);
560 if(result == -1 && errno == EINTR)
570 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
571 meshlink_handle_t* mesh = handle;
573 case SPTPS_HANDSHAKE:
574 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof mesh->cookie);
577 mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
578 memcpy(mesh->data + mesh->thedatalen, msg, len);
579 mesh->thedatalen += len;
580 mesh->data[mesh->thedatalen] = 0;
584 mesh->thedatalen = 0;
585 return finalize_join(mesh);
588 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
589 shutdown(mesh->sock, SHUT_RDWR);
590 mesh->success = true;
600 static bool recvline(meshlink_handle_t* mesh, size_t len) {
601 char *newline = NULL;
606 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
607 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof mesh->buffer - mesh->blen, 0);
608 if(result == -1 && errno == EINTR)
612 mesh->blen += result;
615 if(newline - mesh->buffer >= len)
618 len = newline - mesh->buffer;
620 memcpy(mesh->line, mesh->buffer, len);
622 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
623 mesh->blen -= len + 1;
627 static bool sendline(int fd, char *format, ...) {
628 static char buffer[4096];
633 va_start(ap, format);
634 blen = vsnprintf(buffer, sizeof buffer, format, ap);
637 if(blen < 1 || blen >= sizeof buffer)
644 int result = send(fd, p, blen, MSG_NOSIGNAL);
645 if(result == -1 && errno == EINTR)
656 static const char *errstr[] = {
657 [MESHLINK_OK] = "No error",
658 [MESHLINK_EINVAL] = "Invalid argument",
659 [MESHLINK_ENOMEM] = "Out of memory",
660 [MESHLINK_ENOENT] = "No such node",
661 [MESHLINK_EEXIST] = "Node already exists",
662 [MESHLINK_EINTERNAL] = "Internal error",
663 [MESHLINK_ERESOLV] = "Could not resolve hostname",
664 [MESHLINK_ESTORAGE] = "Storage error",
665 [MESHLINK_ENETWORK] = "Network error",
666 [MESHLINK_EPEER] = "Error communicating with peer",
669 const char *meshlink_strerror(meshlink_errno_t err) {
670 if(err < 0 || err >= sizeof errstr / sizeof *errstr)
671 return "Invalid error code";
675 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
678 char pubname[PATH_MAX], privname[PATH_MAX];
680 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
682 if(!(key = ecdsa_generate())) {
683 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
684 meshlink_errno = MESHLINK_EINTERNAL;
687 logger(mesh, MESHLINK_DEBUG, "Done.\n");
689 snprintf(privname, sizeof privname, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
690 f = fopen(privname, "wb");
693 meshlink_errno = MESHLINK_ESTORAGE;
698 fchmod(fileno(f), 0600);
701 if(!ecdsa_write_pem_private_key(key, f)) {
702 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
705 meshlink_errno = MESHLINK_EINTERNAL;
711 snprintf(pubname, sizeof pubname, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
712 f = fopen(pubname, "a");
715 meshlink_errno = MESHLINK_ESTORAGE;
719 char *pubkey = ecdsa_get_base64_public_key(key);
720 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
729 static struct timeval idle(event_loop_t *loop, void *data) {
730 meshlink_handle_t *mesh = data;
731 struct timeval t, tmin = {3600, 0};
732 for splay_each(node_t, n, mesh->nodes) {
735 t = utcp_timeout(n->utcp);
736 if(timercmp(&t, &tmin, <))
742 // Find out what local address a socket would use if we connect to the given address.
743 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
744 // of both endpoints, but this will actually not send any UDP packet.
745 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
746 struct addrinfo *rai = NULL;
747 const struct addrinfo hint = {
748 .ai_family = AF_UNSPEC,
749 .ai_socktype = SOCK_DGRAM,
750 .ai_protocol = IPPROTO_UDP,
753 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai)
756 int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
762 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
769 struct sockaddr_storage sn;
770 socklen_t sl = sizeof sn;
772 if(getsockname(sock, (struct sockaddr *)&sn, &sl))
775 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV))
781 // Get our local address(es) by simulating connecting to an Internet host.
782 static void add_local_addresses(meshlink_handle_t *mesh) {
783 char host[NI_MAXHOST];
784 char entry[MAX_STRING_SIZE];
788 if(getlocaladdrname("93.184.216.34", host, sizeof host)) {
789 snprintf(entry, sizeof entry, "%s %s", host, mesh->myport);
790 append_config_file(mesh, mesh->name, "Address", entry);
795 if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof host)) {
796 snprintf(entry, sizeof entry, "%s %s", host, mesh->myport);
797 append_config_file(mesh, mesh->name, "Address", entry);
801 static bool meshlink_setup(meshlink_handle_t *mesh) {
802 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
803 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
804 meshlink_errno = MESHLINK_ESTORAGE;
808 char filename[PATH_MAX];
809 snprintf(filename, sizeof filename, "%s" SLASH "hosts", mesh->confbase);
811 if(mkdir(filename, 0777) && errno != EEXIST) {
812 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
813 meshlink_errno = MESHLINK_ESTORAGE;
817 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
819 if(!access(filename, F_OK)) {
820 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
821 meshlink_errno = MESHLINK_EEXIST;
825 FILE *f = fopen(filename, "w");
827 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
828 meshlink_errno = MESHLINK_ESTORAGE;
832 fprintf(f, "Name = %s\n", mesh->name);
835 if(!ecdsa_keygen(mesh)) {
836 meshlink_errno = MESHLINK_EINTERNAL;
845 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char* appname, dev_class_t devclass) {
846 // Validate arguments provided by the application
847 bool usingname = false;
849 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
851 if(!confbase || !*confbase) {
852 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
853 meshlink_errno = MESHLINK_EINVAL;
857 if(!appname || !*appname) {
858 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
859 meshlink_errno = MESHLINK_EINVAL;
863 if(!name || !*name) {
864 logger(NULL, MESHLINK_ERROR, "No name given!\n");
867 else { //check name only if there is a name != NULL
869 if(!check_id(name)) {
870 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
871 meshlink_errno = MESHLINK_EINVAL;
873 } else { usingname = true;}
876 if(devclass < 0 || devclass > _DEV_CLASS_MAX) {
877 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
878 meshlink_errno = MESHLINK_EINVAL;
882 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
883 mesh->confbase = xstrdup(confbase);
884 mesh->appname = xstrdup(appname);
885 mesh->devclass = devclass;
886 if (usingname) mesh->name = xstrdup(name);
889 pthread_mutexattr_t attr;
890 pthread_mutexattr_init(&attr);
891 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
892 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
894 mesh->threadstarted = false;
895 event_loop_init(&mesh->loop);
896 mesh->loop.data = mesh;
898 // Check whether meshlink.conf already exists
900 char filename[PATH_MAX];
901 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
903 if(access(filename, R_OK)) {
904 if(errno == ENOENT) {
906 if(!meshlink_setup(mesh)) {
907 // meshlink_errno is set by meshlink_setup()
911 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
912 meshlink_close(mesh);
913 meshlink_errno = MESHLINK_ESTORAGE;
918 // Read the configuration
920 init_configuration(&mesh->config);
922 if(!read_server_config(mesh)) {
923 meshlink_close(mesh);
924 meshlink_errno = MESHLINK_ESTORAGE;
929 struct WSAData wsa_state;
930 WSAStartup(MAKEWORD(2, 2), &wsa_state);
933 // Setup up everything
934 // TODO: we should not open listening sockets yet
936 if(!setup_network(mesh)) {
937 meshlink_close(mesh);
938 meshlink_errno = MESHLINK_ENETWORK;
942 add_local_addresses(mesh);
944 idle_set(&mesh->loop, idle, mesh);
946 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
950 static void *meshlink_main_loop(void *arg) {
951 meshlink_handle_t *mesh = arg;
953 pthread_mutex_lock(&(mesh->mesh_mutex));
955 try_outgoing_connections(mesh);
957 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
959 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
961 pthread_mutex_unlock(&(mesh->mesh_mutex));
965 bool meshlink_start(meshlink_handle_t *mesh) {
967 meshlink_errno = MESHLINK_EINVAL;
971 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
973 pthread_mutex_lock(&(mesh->mesh_mutex));
975 if(mesh->threadstarted) {
976 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
977 pthread_mutex_unlock(&(mesh->mesh_mutex));
981 if(mesh->listen_socket[0].tcp.fd < 0) {
982 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
983 meshlink_errno = MESHLINK_ENETWORK;
987 mesh->thedatalen = 0;
989 // TODO: open listening sockets first
991 //Check that a valid name is set
993 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
994 meshlink_errno = MESHLINK_EINVAL;
995 pthread_mutex_unlock(&(mesh->mesh_mutex));
999 // Start the main thread
1001 event_loop_start(&mesh->loop);
1003 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1004 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1005 memset(&mesh->thread, 0, sizeof mesh->thread);
1006 meshlink_errno = MESHLINK_EINTERNAL;
1007 pthread_mutex_unlock(&(mesh->mesh_mutex));
1011 mesh->threadstarted=true;
1013 discovery_start(mesh);
1015 pthread_mutex_unlock(&(mesh->mesh_mutex));
1019 void meshlink_stop(meshlink_handle_t *mesh) {
1021 meshlink_errno = MESHLINK_EINVAL;
1025 pthread_mutex_lock(&(mesh->mesh_mutex));
1026 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1029 discovery_stop(mesh);
1031 // Shut down the main thread
1032 event_loop_stop(&mesh->loop);
1034 // Send ourselves a UDP packet to kick the event loop
1035 listen_socket_t *s = &mesh->listen_socket[0];
1036 if(sendto(s->udp.fd, "", 1, MSG_NOSIGNAL, &s->sa.sa, SALEN(s->sa.sa)) == -1)
1037 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself");
1039 // Wait for the main thread to finish
1040 pthread_mutex_unlock(&(mesh->mesh_mutex));
1041 pthread_join(mesh->thread, NULL);
1042 pthread_mutex_lock(&(mesh->mesh_mutex));
1044 mesh->threadstarted = false;
1046 pthread_mutex_unlock(&(mesh->mesh_mutex));
1049 void meshlink_close(meshlink_handle_t *mesh) {
1050 if(!mesh || !mesh->confbase) {
1051 meshlink_errno = MESHLINK_EINVAL;
1055 // stop can be called even if mesh has not been started
1056 meshlink_stop(mesh);
1058 // lock is not released after this
1059 pthread_mutex_lock(&(mesh->mesh_mutex));
1061 // Close and free all resources used.
1063 close_network_connections(mesh);
1065 logger(mesh, MESHLINK_INFO, "Terminating");
1067 exit_configuration(&mesh->config);
1068 event_loop_exit(&mesh->loop);
1075 ecdsa_free(mesh->invitation_key);
1078 free(mesh->appname);
1079 free(mesh->confbase);
1080 pthread_mutex_destroy(&(mesh->mesh_mutex));
1082 memset(mesh, 0, sizeof *mesh);
1087 static void deltree(const char *dirname) {
1088 DIR *d = opendir(dirname);
1091 while((ent = readdir(d))) {
1092 if(ent->d_name[0] == '.')
1094 char filename[PATH_MAX];
1095 snprintf(filename, sizeof filename, "%s" SLASH "%s", dirname, ent->d_name);
1096 if(unlink(filename))
1105 bool meshlink_destroy(const char *confbase) {
1107 meshlink_errno = MESHLINK_EINVAL;
1111 char filename[PATH_MAX];
1112 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", confbase);
1114 if(unlink(filename)) {
1115 if(errno == ENOENT) {
1116 meshlink_errno = MESHLINK_ENOENT;
1119 logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
1120 meshlink_errno = MESHLINK_ESTORAGE;
1130 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1132 meshlink_errno = MESHLINK_EINVAL;
1136 pthread_mutex_lock(&(mesh->mesh_mutex));
1137 mesh->receive_cb = cb;
1138 pthread_mutex_unlock(&(mesh->mesh_mutex));
1141 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1143 meshlink_errno = MESHLINK_EINVAL;
1147 pthread_mutex_lock(&(mesh->mesh_mutex));
1148 mesh->node_status_cb = cb;
1149 pthread_mutex_unlock(&(mesh->mesh_mutex));
1152 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1154 pthread_mutex_lock(&(mesh->mesh_mutex));
1156 mesh->log_level = cb ? level : 0;
1157 pthread_mutex_unlock(&(mesh->mesh_mutex));
1160 global_log_level = cb ? level : 0;
1164 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1165 meshlink_packethdr_t *hdr;
1167 // Validate arguments
1168 if(!mesh || !destination || len >= MAXSIZE - sizeof *hdr) {
1169 meshlink_errno = MESHLINK_EINVAL;
1177 meshlink_errno = MESHLINK_EINVAL;
1181 // Prepare the packet
1182 vpn_packet_t *packet = malloc(sizeof *packet);
1184 meshlink_errno = MESHLINK_ENOMEM;
1188 packet->probe = false;
1189 packet->tcp = false;
1190 packet->len = len + sizeof *hdr;
1192 hdr = (meshlink_packethdr_t *)packet->data;
1193 memset(hdr, 0, sizeof *hdr);
1194 // leave the last byte as 0 to make sure strings are always
1195 // null-terminated if they are longer than the buffer
1196 strncpy(hdr->destination, destination->name, (sizeof hdr->destination) - 1);
1197 strncpy(hdr->source, mesh->self->name, (sizeof hdr->source) -1 );
1199 memcpy(packet->data + sizeof *hdr, data, len);
1202 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1204 meshlink_errno = MESHLINK_ENOMEM;
1208 // Notify event loop
1209 signal_trigger(&(mesh->loop),&(mesh->datafromapp));
1214 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1215 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1219 mesh->self->in_packets++;
1220 mesh->self->in_bytes += packet->len;
1221 route(mesh, mesh->self, packet);
1224 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1225 if(!mesh || !destination) {
1226 meshlink_errno = MESHLINK_EINVAL;
1229 pthread_mutex_lock(&(mesh->mesh_mutex));
1231 node_t *n = (node_t *)destination;
1232 if(!n->status.reachable) {
1233 pthread_mutex_unlock(&(mesh->mesh_mutex));
1237 else if(n->mtuprobes > 30 && n->minmtu) {
1238 pthread_mutex_unlock(&(mesh->mesh_mutex));
1242 pthread_mutex_unlock(&(mesh->mesh_mutex));
1247 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1248 if(!mesh || !node) {
1249 meshlink_errno = MESHLINK_EINVAL;
1252 pthread_mutex_lock(&(mesh->mesh_mutex));
1254 node_t *n = (node_t *)node;
1256 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1257 meshlink_errno = MESHLINK_EINTERNAL;
1258 pthread_mutex_unlock(&(mesh->mesh_mutex));
1262 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1265 meshlink_errno = MESHLINK_EINTERNAL;
1267 pthread_mutex_unlock(&(mesh->mesh_mutex));
1271 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1273 meshlink_errno = MESHLINK_EINVAL;
1277 return (meshlink_node_t *)mesh->self;
1280 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1281 if(!mesh || !name) {
1282 meshlink_errno = MESHLINK_EINVAL;
1286 meshlink_node_t *node = NULL;
1288 pthread_mutex_lock(&(mesh->mesh_mutex));
1289 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1290 pthread_mutex_unlock(&(mesh->mesh_mutex));
1294 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1295 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1296 meshlink_errno = MESHLINK_EINVAL;
1300 meshlink_node_t **result;
1303 pthread_mutex_lock(&(mesh->mesh_mutex));
1305 *nmemb = mesh->nodes->count;
1306 result = realloc(nodes, *nmemb * sizeof *nodes);
1309 meshlink_node_t **p = result;
1310 for splay_each(node_t, n, mesh->nodes)
1311 *p++ = (meshlink_node_t *)n;
1315 meshlink_errno = MESHLINK_ENOMEM;
1318 pthread_mutex_unlock(&(mesh->mesh_mutex));
1323 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1324 if(!mesh || !data || !len || !signature || !siglen) {
1325 meshlink_errno = MESHLINK_EINVAL;
1329 if(*siglen < MESHLINK_SIGLEN) {
1330 meshlink_errno = MESHLINK_EINVAL;
1334 pthread_mutex_lock(&(mesh->mesh_mutex));
1336 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1337 meshlink_errno = MESHLINK_EINTERNAL;
1338 pthread_mutex_unlock(&(mesh->mesh_mutex));
1342 *siglen = MESHLINK_SIGLEN;
1343 pthread_mutex_unlock(&(mesh->mesh_mutex));
1347 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1348 if(!mesh || !data || !len || !signature) {
1349 meshlink_errno = MESHLINK_EINVAL;
1353 if(siglen != MESHLINK_SIGLEN) {
1354 meshlink_errno = MESHLINK_EINVAL;
1358 pthread_mutex_lock(&(mesh->mesh_mutex));
1362 struct node_t *n = (struct node_t *)source;
1363 node_read_ecdsa_public_key(mesh, n);
1365 meshlink_errno = MESHLINK_EINTERNAL;
1368 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1370 pthread_mutex_unlock(&(mesh->mesh_mutex));
1374 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1375 char filename[PATH_MAX];
1377 pthread_mutex_lock(&(mesh->mesh_mutex));
1379 snprintf(filename, sizeof filename, "%s" SLASH "invitations", mesh->confbase);
1380 if(mkdir(filename, 0700) && errno != EEXIST) {
1381 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1382 meshlink_errno = MESHLINK_ESTORAGE;
1383 pthread_mutex_unlock(&(mesh->mesh_mutex));
1387 // Count the number of valid invitations, clean up old ones
1388 DIR *dir = opendir(filename);
1390 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1391 meshlink_errno = MESHLINK_ESTORAGE;
1392 pthread_mutex_unlock(&(mesh->mesh_mutex));
1399 time_t deadline = time(NULL) - 604800; // 1 week in the past
1401 while((ent = readdir(dir))) {
1402 if(strlen(ent->d_name) != 24)
1404 char invname[PATH_MAX];
1406 snprintf(invname, sizeof invname, "%s" SLASH "%s", filename, ent->d_name);
1407 if(!stat(invname, &st)) {
1408 if(mesh->invitation_key && deadline < st.st_mtime)
1413 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1419 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1421 meshlink_errno = MESHLINK_ESTORAGE;
1422 pthread_mutex_unlock(&(mesh->mesh_mutex));
1428 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1430 // Remove the key if there are no outstanding invitations.
1433 if(mesh->invitation_key) {
1434 ecdsa_free(mesh->invitation_key);
1435 mesh->invitation_key = NULL;
1439 if(mesh->invitation_key) {
1440 pthread_mutex_unlock(&(mesh->mesh_mutex));
1444 // Create a new key if necessary.
1445 FILE *f = fopen(filename, "rb");
1447 if(errno != ENOENT) {
1448 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1449 meshlink_errno = MESHLINK_ESTORAGE;
1450 pthread_mutex_unlock(&(mesh->mesh_mutex));
1454 mesh->invitation_key = ecdsa_generate();
1455 if(!mesh->invitation_key) {
1456 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1457 meshlink_errno = MESHLINK_EINTERNAL;
1458 pthread_mutex_unlock(&(mesh->mesh_mutex));
1461 f = fopen(filename, "wb");
1463 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1464 meshlink_errno = MESHLINK_ESTORAGE;
1465 pthread_mutex_unlock(&(mesh->mesh_mutex));
1468 chmod(filename, 0600);
1469 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1472 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1474 if(!mesh->invitation_key) {
1475 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1476 meshlink_errno = MESHLINK_ESTORAGE;
1480 pthread_mutex_unlock(&(mesh->mesh_mutex));
1481 return mesh->invitation_key;
1484 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1485 if(!mesh || !address) {
1486 meshlink_errno = MESHLINK_EINVAL;
1490 if(!is_valid_hostname(address)) {
1491 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1492 meshlink_errno = MESHLINK_EINVAL;
1498 pthread_mutex_lock(&(mesh->mesh_mutex));
1499 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1500 pthread_mutex_unlock(&(mesh->mesh_mutex));
1505 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1507 meshlink_errno = MESHLINK_EINVAL;
1511 char *address = meshlink_get_external_address(mesh);
1517 pthread_mutex_lock(&(mesh->mesh_mutex));
1518 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1519 pthread_mutex_unlock(&(mesh->mesh_mutex));
1525 int meshlink_get_port(meshlink_handle_t *mesh) {
1527 meshlink_errno = MESHLINK_EINVAL;
1532 meshlink_errno = MESHLINK_EINTERNAL;
1536 return atoi(mesh->myport);
1539 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1540 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1541 meshlink_errno = MESHLINK_EINVAL;
1545 if(mesh->myport && port == atoi(mesh->myport))
1548 if(!try_bind(port)) {
1549 meshlink_errno = MESHLINK_ENETWORK;
1555 pthread_mutex_lock(&(mesh->mesh_mutex));
1556 if(mesh->threadstarted) {
1557 meshlink_errno = MESHLINK_EINVAL;
1561 close_network_connections(mesh);
1562 exit_configuration(&mesh->config);
1565 snprintf(portstr, sizeof portstr, "%d", port);
1566 portstr[sizeof portstr - 1] = 0;
1568 modify_config_file(mesh, mesh->name, "Port", portstr, true);
1570 init_configuration(&mesh->config);
1572 if(!read_server_config(mesh))
1573 meshlink_errno = MESHLINK_ESTORAGE;
1574 else if(!setup_network(mesh))
1575 meshlink_errno = MESHLINK_ENETWORK;
1580 pthread_mutex_unlock(&(mesh->mesh_mutex));
1585 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1587 meshlink_errno = MESHLINK_EINVAL;
1591 pthread_mutex_lock(&(mesh->mesh_mutex));
1593 // Check validity of the new node's name
1594 if(!check_id(name)) {
1595 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1596 meshlink_errno = MESHLINK_EINVAL;
1597 pthread_mutex_unlock(&(mesh->mesh_mutex));
1601 // Ensure no host configuration file with that name exists
1602 char filename[PATH_MAX];
1603 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1604 if(!access(filename, F_OK)) {
1605 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1606 meshlink_errno = MESHLINK_EEXIST;
1607 pthread_mutex_unlock(&(mesh->mesh_mutex));
1611 // Ensure no other nodes know about this name
1612 if(meshlink_get_node(mesh, name)) {
1613 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1614 meshlink_errno = MESHLINK_EEXIST;
1615 pthread_mutex_unlock(&(mesh->mesh_mutex));
1619 // Get the local address
1620 char *address = get_my_hostname(mesh);
1622 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1623 meshlink_errno = MESHLINK_ERESOLV;
1624 pthread_mutex_unlock(&(mesh->mesh_mutex));
1628 if(!refresh_invitation_key(mesh)) {
1629 meshlink_errno = MESHLINK_EINTERNAL;
1630 pthread_mutex_unlock(&(mesh->mesh_mutex));
1636 // Create a hash of the key.
1637 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1638 sha512(fingerprint, strlen(fingerprint), hash);
1639 b64encode_urlsafe(hash, hash, 18);
1641 // Create a random cookie for this invitation.
1643 randomize(cookie, 18);
1645 // Create a filename that doesn't reveal the cookie itself
1646 char buf[18 + strlen(fingerprint)];
1647 char cookiehash[64];
1648 memcpy(buf, cookie, 18);
1649 memcpy(buf + 18, fingerprint, sizeof buf - 18);
1650 sha512(buf, sizeof buf, cookiehash);
1651 b64encode_urlsafe(cookiehash, cookiehash, 18);
1653 b64encode_urlsafe(cookie, cookie, 18);
1657 // Create a file containing the details of the invitation.
1658 snprintf(filename, sizeof filename, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1659 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1661 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1662 meshlink_errno = MESHLINK_ESTORAGE;
1663 pthread_mutex_unlock(&(mesh->mesh_mutex));
1666 FILE *f = fdopen(ifd, "w");
1670 // Fill in the details.
1671 fprintf(f, "Name = %s\n", name);
1673 // fprintf(f, "NetName = %s\n", netname);
1674 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1676 // Copy Broadcast and Mode
1677 snprintf(filename, sizeof filename, "%s" SLASH "meshlink.conf", mesh->confbase);
1678 FILE *tc = fopen(filename, "r");
1681 while(fgets(buf, sizeof buf, tc)) {
1682 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1683 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1685 // Make sure there is a newline character.
1686 if(!strchr(buf, '\n'))
1692 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1693 meshlink_errno = MESHLINK_ESTORAGE;
1694 pthread_mutex_unlock(&(mesh->mesh_mutex));
1698 fprintf(f, "#---------------------------------------------------------------#\n");
1699 fprintf(f, "Name = %s\n", mesh->self->name);
1701 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1705 // Create an URL from the local address, key hash and cookie
1707 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1710 pthread_mutex_unlock(&(mesh->mesh_mutex));
1714 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1715 if(!mesh || !invitation) {
1716 meshlink_errno = MESHLINK_EINVAL;
1720 pthread_mutex_lock(&(mesh->mesh_mutex));
1722 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
1723 char copy[strlen(invitation) + 1];
1724 strcpy(copy, invitation);
1726 // Split the invitation URL into hostname, port, key hash and cookie.
1728 char *slash = strchr(copy, '/');
1734 if(strlen(slash) != 48)
1737 char *address = copy;
1739 if(*address == '[') {
1741 char *bracket = strchr(address, ']');
1745 if(bracket[1] == ':')
1748 port = strchr(address, ':');
1756 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18))
1759 // Generate a throw-away key for the invitation.
1760 ecdsa_t *key = ecdsa_generate();
1762 meshlink_errno = MESHLINK_EINTERNAL;
1763 pthread_mutex_unlock(&(mesh->mesh_mutex));
1767 char *b64key = ecdsa_get_base64_public_key(key);
1769 //Before doing meshlink_join make sure we are not connected to another mesh
1770 if ( mesh->threadstarted ){
1774 // Connect to the meshlink daemon mentioned in the URL.
1775 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
1777 meshlink_errno = MESHLINK_ERESOLV;
1778 pthread_mutex_unlock(&(mesh->mesh_mutex));
1782 mesh->sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
1783 if(mesh->sock <= 0) {
1784 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
1786 meshlink_errno = MESHLINK_ENETWORK;
1787 pthread_mutex_unlock(&(mesh->mesh_mutex));
1791 set_timeout(mesh->sock, 5000);
1793 if(connect(mesh->sock, ai->ai_addr, ai->ai_addrlen)) {
1794 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
1795 closesocket(mesh->sock);
1797 meshlink_errno = MESHLINK_ENETWORK;
1798 pthread_mutex_unlock(&(mesh->mesh_mutex));
1804 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
1806 // Tell him we have an invitation, and give him our throw-away key.
1810 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
1811 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
1812 closesocket(mesh->sock);
1813 meshlink_errno = MESHLINK_ENETWORK;
1814 pthread_mutex_unlock(&(mesh->mesh_mutex));
1820 char hisname[4096] = "";
1821 int code, hismajor, hisminor = 0;
1823 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) {
1824 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
1825 closesocket(mesh->sock);
1826 meshlink_errno = MESHLINK_ENETWORK;
1827 pthread_mutex_unlock(&(mesh->mesh_mutex));
1831 // Check if the hash of the key he gave us matches the hash in the URL.
1832 char *fingerprint = mesh->line + 2;
1834 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
1835 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
1836 meshlink_errno = MESHLINK_EINTERNAL;
1837 pthread_mutex_unlock(&(mesh->mesh_mutex));
1840 if(memcmp(hishash, mesh->hash, 18)) {
1841 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
1842 meshlink_errno = MESHLINK_EPEER;
1843 pthread_mutex_unlock(&(mesh->mesh_mutex));
1848 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
1850 meshlink_errno = MESHLINK_EINTERNAL;
1851 pthread_mutex_unlock(&(mesh->mesh_mutex));
1855 // Start an SPTPS session
1856 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof meshlink_invitation_label, invitation_send, invitation_receive)) {
1857 meshlink_errno = MESHLINK_EINTERNAL;
1858 pthread_mutex_unlock(&(mesh->mesh_mutex));
1862 // Feed rest of input buffer to SPTPS
1863 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
1864 meshlink_errno = MESHLINK_EPEER;
1865 pthread_mutex_unlock(&(mesh->mesh_mutex));
1871 while((len = recv(mesh->sock, mesh->line, sizeof mesh->line, 0))) {
1875 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
1876 meshlink_errno = MESHLINK_ENETWORK;
1877 pthread_mutex_unlock(&(mesh->mesh_mutex));
1881 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
1882 meshlink_errno = MESHLINK_EPEER;
1883 pthread_mutex_unlock(&(mesh->mesh_mutex));
1888 sptps_stop(&mesh->sptps);
1891 closesocket(mesh->sock);
1893 if(!mesh->success) {
1894 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
1895 meshlink_errno = MESHLINK_EPEER;
1896 pthread_mutex_unlock(&(mesh->mesh_mutex));
1900 pthread_mutex_unlock(&(mesh->mesh_mutex));
1904 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL or you are already connected to a Mesh ?\n");
1905 meshlink_errno = MESHLINK_EINVAL;
1906 pthread_mutex_unlock(&(mesh->mesh_mutex));
1910 char *meshlink_export(meshlink_handle_t *mesh) {
1912 meshlink_errno = MESHLINK_EINVAL;
1916 pthread_mutex_lock(&(mesh->mesh_mutex));
1918 char filename[PATH_MAX];
1919 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1920 FILE *f = fopen(filename, "r");
1922 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
1923 meshlink_errno = MESHLINK_ESTORAGE;
1924 pthread_mutex_unlock(&(mesh->mesh_mutex));
1928 fseek(f, 0, SEEK_END);
1929 int fsize = ftell(f);
1932 size_t len = fsize + 9 + strlen(mesh->self->name);
1933 char *buf = xmalloc(len);
1934 snprintf(buf, len, "Name = %s\n", mesh->self->name);
1935 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
1936 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
1938 meshlink_errno = MESHLINK_ESTORAGE;
1939 pthread_mutex_unlock(&(mesh->mesh_mutex));
1946 pthread_mutex_unlock(&(mesh->mesh_mutex));
1950 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
1951 if(!mesh || !data) {
1952 meshlink_errno = MESHLINK_EINVAL;
1956 pthread_mutex_lock(&(mesh->mesh_mutex));
1958 if(strncmp(data, "Name = ", 7)) {
1959 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1960 meshlink_errno = MESHLINK_EPEER;
1961 pthread_mutex_unlock(&(mesh->mesh_mutex));
1965 char *end = strchr(data + 7, '\n');
1967 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
1968 meshlink_errno = MESHLINK_EPEER;
1969 pthread_mutex_unlock(&(mesh->mesh_mutex));
1973 int len = end - (data + 7);
1975 memcpy(name, data + 7, len);
1977 if(!check_id(name)) {
1978 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
1979 meshlink_errno = MESHLINK_EPEER;
1980 pthread_mutex_unlock(&(mesh->mesh_mutex));
1984 char filename[PATH_MAX];
1985 snprintf(filename, sizeof filename, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1986 if(!access(filename, F_OK)) {
1987 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
1988 meshlink_errno = MESHLINK_EEXIST;
1989 pthread_mutex_unlock(&(mesh->mesh_mutex));
1993 if(errno != ENOENT) {
1994 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
1995 meshlink_errno = MESHLINK_ESTORAGE;
1996 pthread_mutex_unlock(&(mesh->mesh_mutex));
2000 FILE *f = fopen(filename, "w");
2002 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
2003 meshlink_errno = MESHLINK_ESTORAGE;
2004 pthread_mutex_unlock(&(mesh->mesh_mutex));
2008 fwrite(end + 1, strlen(end + 1), 1, f);
2011 load_all_nodes(mesh);
2013 pthread_mutex_unlock(&(mesh->mesh_mutex));
2017 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2018 if(!mesh || !node) {
2019 meshlink_errno = MESHLINK_EINVAL;
2023 pthread_mutex_lock(&(mesh->mesh_mutex));
2027 n->status.blacklisted=true;
2028 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n",node->name);
2030 //Make blacklisting persistent in the config file
2031 append_config_file(mesh, n->name, "blacklisted", "yes");
2033 pthread_mutex_unlock(&(mesh->mesh_mutex));
2037 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2038 if(!mesh || !node) {
2039 meshlink_errno = MESHLINK_EINVAL;
2043 pthread_mutex_lock(&(mesh->mesh_mutex));
2045 node_t *n = (node_t *)node;
2046 n->status.blacklisted = false;
2048 //TODO: remove blacklisted = yes from the config file
2050 pthread_mutex_unlock(&(mesh->mesh_mutex));
2054 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2055 mesh->default_blacklist = blacklist;
2058 /* Hint that a hostname may be found at an address
2059 * See header file for detailed comment.
2061 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2062 if(!mesh || !node || !addr)
2065 // Ignore hints about ourself.
2066 if((node_t *)node == mesh->self)
2069 pthread_mutex_lock(&(mesh->mesh_mutex));
2071 char *host = NULL, *port = NULL, *str = NULL;
2072 sockaddr2str((const sockaddr_t *)addr, &host, &port);
2075 xasprintf(&str, "%s %s", host, port);
2076 if ( (strncmp ("fe80",host,4) != 0) && ( strncmp("127.",host,4) != 0 ) && ( strcmp("localhost",host) !=0 ) )
2077 append_config_file(mesh, node->name, "Address", str);
2079 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
2086 pthread_mutex_unlock(&(mesh->mesh_mutex));
2087 // @TODO do we want to fire off a connection attempt right away?
2090 /* Return an array of edges in the current network graph.
2091 * Data captures the current state and will not be updated.
2092 * Caller must deallocate data when done.
2094 meshlink_edge_t **meshlink_get_all_edges_state(meshlink_handle_t *mesh, meshlink_edge_t **edges, size_t *nmemb) {
2095 if(!mesh || !nmemb || (*nmemb && !edges)) {
2096 meshlink_errno = MESHLINK_EINVAL;
2100 pthread_mutex_lock(&(mesh->mesh_mutex));
2102 meshlink_edge_t **result = NULL;
2103 meshlink_edge_t *copy = NULL;
2104 int result_size = 0;
2106 result_size = mesh->edges->count;
2108 // if result is smaller than edges, we have to dealloc all the excess meshlink_edge_t
2109 if(result_size > *nmemb) {
2110 result = realloc(edges, result_size * sizeof (meshlink_edge_t*));
2116 meshlink_edge_t **p = result;
2118 for splay_each(edge_t, e, mesh->edges) {
2119 // skip edges that do not represent a two-directional connection
2120 if((!e->reverse) || (e->reverse->to != e->from)) {
2125 // the first *nmemb members of result can be re-used
2127 copy = xzalloc(sizeof *copy);
2132 copy->from = (meshlink_node_t*)e->from;
2133 copy->to = (meshlink_node_t*)e->to;
2134 copy->address = e->address.storage;
2135 copy->options = e->options;
2136 copy->weight = e->weight;
2139 // shrink result to the actual amount of memory used
2140 for(int i = *nmemb; i > result_size; i--) {
2141 free(result[i - 1]);
2143 result = realloc(result, result_size * sizeof (meshlink_edge_t*));
2144 *nmemb = result_size;
2147 meshlink_errno = MESHLINK_ENOMEM;
2150 pthread_mutex_unlock(&(mesh->mesh_mutex));
2155 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2160 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2161 meshlink_channel_t *channel = connection->priv;
2164 node_t *n = channel->node;
2165 meshlink_handle_t *mesh = n->mesh;
2166 if(channel->receive_cb)
2167 channel->receive_cb(mesh, channel, data, len);
2171 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2172 node_t *n = utcp_connection->utcp->priv;
2175 meshlink_handle_t *mesh = n->mesh;
2176 if(!mesh->channel_accept_cb)
2178 meshlink_channel_t *channel = xzalloc(sizeof *channel);
2180 channel->c = utcp_connection;
2181 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0))
2182 utcp_accept(utcp_connection, channel_recv, channel);
2187 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2188 node_t *n = utcp->priv;
2189 meshlink_handle_t *mesh = n->mesh;
2190 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? len : -1;
2193 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2194 if(!mesh || !channel) {
2195 meshlink_errno = MESHLINK_EINVAL;
2199 channel->receive_cb = cb;
2202 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2203 node_t *n = (node_t *)source;
2206 utcp_recv(n->utcp, data, len);
2209 static void channel_poll(struct utcp_connection *connection, size_t len) {
2210 meshlink_channel_t *channel = connection->priv;
2213 node_t *n = channel->node;
2214 meshlink_handle_t *mesh = n->mesh;
2215 if(channel->poll_cb)
2216 channel->poll_cb(mesh, channel, len);
2219 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2220 channel->poll_cb = cb;
2221 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2224 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2226 meshlink_errno = MESHLINK_EINVAL;
2230 pthread_mutex_lock(&mesh->mesh_mutex);
2231 mesh->channel_accept_cb = cb;
2232 mesh->receive_cb = channel_receive;
2233 for splay_each(node_t, n, mesh->nodes) {
2234 if(!n->utcp && n != mesh->self) {
2235 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2238 pthread_mutex_unlock(&mesh->mesh_mutex);
2241 meshlink_channel_t *meshlink_channel_open_ex(meshlink_handle_t *mesh, meshlink_node_t *node, uint16_t port, meshlink_channel_receive_cb_t cb, const void *data, size_t len, uint32_t flags) {
2242 if(!mesh || !node) {
2243 meshlink_errno = MESHLINK_EINVAL;
2247 node_t *n = (node_t *)node;
2249 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2250 mesh->receive_cb = channel_receive;
2252 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2256 meshlink_channel_t *channel = xzalloc(sizeof *channel);
2258 channel->receive_cb = cb;
2259 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2261 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2268 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) {
2269 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2272 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2273 if(!mesh || !channel) {
2274 meshlink_errno = MESHLINK_EINVAL;
2278 utcp_shutdown(channel->c, direction);
2281 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2282 if(!mesh || !channel) {
2283 meshlink_errno = MESHLINK_EINVAL;
2287 utcp_close(channel->c);
2291 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2292 if(!mesh || !channel) {
2293 meshlink_errno = MESHLINK_EINVAL;
2301 meshlink_errno = MESHLINK_EINVAL;
2305 // TODO: more finegrained locking.
2306 // Ideally we want to put the data into the UTCP connection's send buffer.
2307 // Then, preferrably only if there is room in the receiver window,
2308 // kick the meshlink thread to go send packets.
2310 pthread_mutex_lock(&mesh->mesh_mutex);
2311 ssize_t retval = utcp_send(channel->c, data, len);
2312 pthread_mutex_unlock(&mesh->mesh_mutex);
2315 meshlink_errno = MESHLINK_ENETWORK;
2319 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2320 if(!mesh || !channel) {
2321 meshlink_errno = MESHLINK_EINVAL;
2325 return channel->c->flags;
2328 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2329 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp)
2330 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2331 if(mesh->node_status_cb)
2332 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2335 static void __attribute__((constructor)) meshlink_init(void) {
2338 randomize(&seed, sizeof seed);
2342 static void __attribute__((destructor)) meshlink_exit(void) {
2346 /// Device class traits
2347 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX +1] = {
2348 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2349 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2350 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2351 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN