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");
124 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
131 while((len = fread(buf, 1, sizeof(buf), in))) {
132 fwrite(buf, len, 1, out);
139 static int rstrip(char *value) {
140 int len = strlen(value);
142 while(len && strchr("\t\r\n ", value[len - 1])) {
149 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
152 if(!filename || (*hostname && *port)) {
156 FILE *f = fopen(filename, "r");
162 while(fgets(line, sizeof(line), f)) {
168 p += strcspn(p, "\t =");
174 q = p + strspn(p, "\t ");
177 q += 1 + strspn(q + 1, "\t ");
181 p = q + strcspn(q, "\t ");
187 p += strspn(p, "\t ");
188 p[strcspn(p, "\t ")] = 0;
190 if(!*port && !strcasecmp(line, "Port")) {
192 } else if(!*hostname && !strcasecmp(line, "Address")) {
193 *hostname = xstrdup(q);
201 if(*hostname && *port) {
209 static bool is_valid_hostname(const char *hostname) {
210 for(const char *p = hostname; *p; p++) {
211 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
219 static void set_timeout(int sock, int timeout) {
224 tv.tv_sec = timeout / 1000;
225 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
227 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
228 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
231 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
232 char *hostname = NULL;
234 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
235 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
236 struct addrinfo *aip = ai;
237 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
241 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
244 set_timeout(s, 5000);
246 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
253 send(s, request, sizeof(request) - 1, 0);
254 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
259 if(line[len - 1] == '\n') {
263 char *p = strrchr(line, '\n');
266 hostname = xstrdup(p + 1);
285 // Check that the hostname is reasonable
286 if(hostname && !is_valid_hostname(hostname)) {
292 meshlink_errno = MESHLINK_ERESOLV;
298 static char *get_my_hostname(meshlink_handle_t *mesh) {
299 char *hostname = NULL;
301 char *hostport = NULL;
302 char *name = mesh->self->name;
303 char filename[PATH_MAX] = "";
306 // Use first Address statement in own host config file
307 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
308 scan_for_hostname(filename, &hostname, &port);
314 hostname = meshlink_get_external_address(mesh);
320 f = fopen(filename, "a");
323 fprintf(f, "\nAddress = %s\n", hostname);
326 logger(mesh, MESHLINK_DEBUG, "Could not append Address to %s: %s\n", filename, strerror(errno));
332 if(strchr(hostname, ':')) {
333 xasprintf(&hostport, "[%s]:%s", hostname, port);
335 xasprintf(&hostport, "%s:%s", hostname, port);
338 if(strchr(hostname, ':')) {
339 xasprintf(&hostport, "[%s]", hostname);
341 hostport = xstrdup(hostname);
350 static char *get_line(const char **data) {
351 if(!data || !*data) {
360 static char line[1024];
361 const char *end = strchr(*data, '\n');
362 size_t len = end ? (size_t)(end - *data) : strlen(*data);
364 if(len >= sizeof(line)) {
365 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
369 if(len && !isprint(**data)) {
373 memcpy(line, *data, len);
385 static char *get_value(const char *data, const char *var) {
386 char *line = get_line(&data);
392 char *sep = line + strcspn(line, " \t=");
393 char *val = sep + strspn(sep, " \t");
396 val += 1 + strspn(val + 1, " \t");
401 if(strcasecmp(line, var)) {
408 static bool try_bind(int port) {
409 struct addrinfo *ai = NULL;
410 struct addrinfo hint = {
411 .ai_flags = AI_PASSIVE,
412 .ai_family = AF_UNSPEC,
413 .ai_socktype = SOCK_STREAM,
414 .ai_protocol = IPPROTO_TCP,
418 snprintf(portstr, sizeof(portstr), "%d", port);
420 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
425 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
432 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
447 int check_port(meshlink_handle_t *mesh) {
448 for(int i = 0; i < 1000; i++) {
449 int port = 0x1000 + (rand() & 0x7fff);
452 char filename[PATH_MAX];
453 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
454 FILE *f = fopen(filename, "a");
457 meshlink_errno = MESHLINK_ESTORAGE;
458 logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n");
462 fprintf(f, "Port = %d\n", port);
468 meshlink_errno = MESHLINK_ENETWORK;
469 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
473 static bool finalize_join(meshlink_handle_t *mesh) {
474 char *name = xstrdup(get_value(mesh->data, "Name"));
477 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
481 if(!check_id(name)) {
482 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
486 char filename[PATH_MAX];
487 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
489 FILE *f = fopen(filename, "w");
492 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
496 fprintf(f, "Name = %s\n", name);
498 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
499 FILE *fh = fopen(filename, "w");
502 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
507 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
508 // Other chunks go unfiltered to their respective host config files
509 const char *p = mesh->data;
512 while((l = get_line(&p))) {
518 // Split line into variable and value
519 int len = strcspn(l, "\t =");
521 value += strspn(value, "\t ");
525 value += strspn(value, "\t ");
531 if(!strcasecmp(l, "Name"))
532 if(strcmp(value, name)) {
536 } else if(!strcasecmp(l, "NetName")) {
540 // Check the list of known variables //TODO: most variables will not be available in meshlink, only name and key will be absolutely necessary
544 for(i = 0; variables[i].name; i++) {
545 if(strcasecmp(l, variables[i].name)) {
553 // Ignore unknown and unsafe variables
555 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
557 } else if(!(variables[i].type & VAR_SAFE)) {
558 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
562 // Copy the safe variable to the right config file
563 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
568 while(l && !strcasecmp(l, "Name")) {
569 if(!check_id(value)) {
570 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
574 if(!strcmp(value, name)) {
575 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
579 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
580 f = fopen(filename, "w");
583 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
587 while((l = get_line(&p))) {
588 if(!strcmp(l, "#---------------------------------------------------------------#")) {
592 int len = strcspn(l, "\t =");
594 if(len == 4 && !strncasecmp(l, "Name", 4)) {
596 value += strspn(value, "\t ");
600 value += strspn(value, "\t ");
614 char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
621 fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
622 fprintf(fh, "Port = %s\n", mesh->myport);
626 sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
629 free(mesh->self->name);
630 free(mesh->self->connection->name);
631 mesh->self->name = xstrdup(name);
632 mesh->self->connection->name = name;
634 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
636 load_all_nodes(mesh);
641 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
643 meshlink_handle_t *mesh = handle;
644 const char *ptr = data;
647 int result = send(mesh->sock, ptr, len, 0);
649 if(result == -1 && errno == EINTR) {
651 } else if(result <= 0) {
662 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
663 meshlink_handle_t *mesh = handle;
666 case SPTPS_HANDSHAKE:
667 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
670 mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
671 memcpy(mesh->data + mesh->thedatalen, msg, len);
672 mesh->thedatalen += len;
673 mesh->data[mesh->thedatalen] = 0;
677 mesh->thedatalen = 0;
678 return finalize_join(mesh);
681 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
682 shutdown(mesh->sock, SHUT_RDWR);
683 mesh->success = true;
693 static bool recvline(meshlink_handle_t *mesh, size_t len) {
694 char *newline = NULL;
700 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
701 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
703 if(result == -1 && errno == EINTR) {
705 } else if(result <= 0) {
709 mesh->blen += result;
712 if((size_t)(newline - mesh->buffer) >= len) {
716 len = newline - mesh->buffer;
718 memcpy(mesh->line, mesh->buffer, len);
720 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
721 mesh->blen -= len + 1;
725 static bool sendline(int fd, char *format, ...) {
726 static char buffer[4096];
731 va_start(ap, format);
732 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
735 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
743 int result = send(fd, p, blen, MSG_NOSIGNAL);
745 if(result == -1 && errno == EINTR) {
747 } else if(result <= 0) {
758 static const char *errstr[] = {
759 [MESHLINK_OK] = "No error",
760 [MESHLINK_EINVAL] = "Invalid argument",
761 [MESHLINK_ENOMEM] = "Out of memory",
762 [MESHLINK_ENOENT] = "No such node",
763 [MESHLINK_EEXIST] = "Node already exists",
764 [MESHLINK_EINTERNAL] = "Internal error",
765 [MESHLINK_ERESOLV] = "Could not resolve hostname",
766 [MESHLINK_ESTORAGE] = "Storage error",
767 [MESHLINK_ENETWORK] = "Network error",
768 [MESHLINK_EPEER] = "Error communicating with peer",
771 const char *meshlink_strerror(meshlink_errno_t err) {
772 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
773 return "Invalid error code";
779 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
782 char pubname[PATH_MAX], privname[PATH_MAX];
784 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
786 if(!(key = ecdsa_generate())) {
787 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
788 meshlink_errno = MESHLINK_EINTERNAL;
791 logger(mesh, MESHLINK_DEBUG, "Done.\n");
794 if (snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) {
795 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase);
796 meshlink_errno = MESHLINK_ESTORAGE;
800 f = fopen(privname, "wb");
803 meshlink_errno = MESHLINK_ESTORAGE;
808 fchmod(fileno(f), 0600);
811 if(!ecdsa_write_pem_private_key(key, f)) {
812 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
815 meshlink_errno = MESHLINK_EINTERNAL;
821 snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
822 f = fopen(pubname, "a");
825 meshlink_errno = MESHLINK_ESTORAGE;
829 char *pubkey = ecdsa_get_base64_public_key(key);
830 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
839 static struct timeval idle(event_loop_t *loop, void *data) {
841 meshlink_handle_t *mesh = data;
842 struct timeval t, tmin = {3600, 0};
844 for splay_each(node_t, n, mesh->nodes) {
849 t = utcp_timeout(n->utcp);
851 if(timercmp(&t, &tmin, <)) {
859 // Find out what local address a socket would use if we connect to the given address.
860 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
861 // of both endpoints, but this will actually not send any UDP packet.
862 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
863 struct addrinfo *rai = NULL;
864 const struct addrinfo hint = {
865 .ai_family = AF_UNSPEC,
866 .ai_socktype = SOCK_DGRAM,
867 .ai_protocol = IPPROTO_UDP,
870 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
874 int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
881 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
888 struct sockaddr_storage sn;
889 socklen_t sl = sizeof(sn);
891 if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
895 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
902 // Get our local address(es) by simulating connecting to an Internet host.
903 static void add_local_addresses(meshlink_handle_t *mesh) {
904 char host[NI_MAXHOST];
905 char entry[MAX_STRING_SIZE];
909 if(getlocaladdrname("93.184.216.34", host, sizeof(host))) {
910 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
911 append_config_file(mesh, mesh->name, "Address", entry);
916 if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) {
917 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
918 append_config_file(mesh, mesh->name, "Address", entry);
922 static bool meshlink_setup(meshlink_handle_t *mesh) {
923 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
924 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
925 meshlink_errno = MESHLINK_ESTORAGE;
929 char filename[PATH_MAX];
930 snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
932 if(mkdir(filename, 0777) && errno != EEXIST) {
933 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
934 meshlink_errno = MESHLINK_ESTORAGE;
938 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
940 if(!access(filename, F_OK)) {
941 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
942 meshlink_errno = MESHLINK_EEXIST;
946 FILE *f = fopen(filename, "w");
949 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
950 meshlink_errno = MESHLINK_ESTORAGE;
954 fprintf(f, "Name = %s\n", mesh->name);
957 if(!ecdsa_keygen(mesh)) {
958 meshlink_errno = MESHLINK_EINTERNAL;
963 if (check_port(mesh) == 0) {
964 meshlink_errno = MESHLINK_ENETWORK;
972 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
973 // Validate arguments provided by the application
974 bool usingname = false;
976 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
978 if(!confbase || !*confbase) {
979 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
980 meshlink_errno = MESHLINK_EINVAL;
984 if(!appname || !*appname) {
985 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
986 meshlink_errno = MESHLINK_EINVAL;
990 if(!name || !*name) {
991 logger(NULL, MESHLINK_ERROR, "No name given!\n");
993 } else { //check name only if there is a name != NULL
995 if(!check_id(name)) {
996 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
997 meshlink_errno = MESHLINK_EINVAL;
1004 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1005 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1006 meshlink_errno = MESHLINK_EINVAL;
1010 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1011 mesh->confbase = xstrdup(confbase);
1012 mesh->appname = xstrdup(appname);
1013 mesh->devclass = devclass;
1016 mesh->name = xstrdup(name);
1020 pthread_mutexattr_t attr;
1021 pthread_mutexattr_init(&attr);
1022 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1023 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1025 mesh->threadstarted = false;
1026 event_loop_init(&mesh->loop);
1027 mesh->loop.data = mesh;
1029 meshlink_queue_init(&mesh->outpacketqueue);
1031 // Check whether meshlink.conf already exists
1033 char filename[PATH_MAX];
1034 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1036 if(access(filename, R_OK)) {
1037 if(errno == ENOENT) {
1038 // If not, create it
1039 if(!meshlink_setup(mesh)) {
1040 // meshlink_errno is set by meshlink_setup()
1044 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
1045 meshlink_close(mesh);
1046 meshlink_errno = MESHLINK_ESTORAGE;
1051 // Read the configuration
1053 init_configuration(&mesh->config);
1055 if(!read_server_config(mesh)) {
1056 meshlink_close(mesh);
1057 meshlink_errno = MESHLINK_ESTORAGE;
1062 struct WSAData wsa_state;
1064 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1068 // Setup up everything
1069 // TODO: we should not open listening sockets yet
1071 if(!setup_network(mesh)) {
1072 meshlink_close(mesh);
1073 meshlink_errno = MESHLINK_ENETWORK;
1077 add_local_addresses(mesh);
1079 idle_set(&mesh->loop, idle, mesh);
1081 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1085 static void *meshlink_main_loop(void *arg) {
1086 meshlink_handle_t *mesh = arg;
1088 pthread_mutex_lock(&(mesh->mesh_mutex));
1090 try_outgoing_connections(mesh);
1092 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1094 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1096 pthread_mutex_unlock(&(mesh->mesh_mutex));
1100 bool meshlink_start(meshlink_handle_t *mesh) {
1102 meshlink_errno = MESHLINK_EINVAL;
1106 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1108 pthread_mutex_lock(&(mesh->mesh_mutex));
1110 if(mesh->threadstarted) {
1111 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1112 pthread_mutex_unlock(&(mesh->mesh_mutex));
1116 if(mesh->listen_socket[0].tcp.fd < 0) {
1117 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1118 meshlink_errno = MESHLINK_ENETWORK;
1122 mesh->thedatalen = 0;
1124 // TODO: open listening sockets first
1126 //Check that a valid name is set
1128 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1129 meshlink_errno = MESHLINK_EINVAL;
1130 pthread_mutex_unlock(&(mesh->mesh_mutex));
1134 // Start the main thread
1136 event_loop_start(&mesh->loop);
1138 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1139 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1140 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1141 meshlink_errno = MESHLINK_EINTERNAL;
1142 pthread_mutex_unlock(&(mesh->mesh_mutex));
1146 mesh->threadstarted = true;
1148 if(mesh->discovery) {
1149 discovery_start(mesh);
1152 pthread_mutex_unlock(&(mesh->mesh_mutex));
1156 void meshlink_stop(meshlink_handle_t *mesh) {
1158 meshlink_errno = MESHLINK_EINVAL;
1162 pthread_mutex_lock(&(mesh->mesh_mutex));
1163 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1166 if(mesh->discovery) {
1167 discovery_stop(mesh);
1170 // Shut down the main thread
1171 event_loop_stop(&mesh->loop);
1173 // Send ourselves a UDP packet to kick the event loop
1174 listen_socket_t *s = &mesh->listen_socket[0];
1176 if(sendto(s->udp.fd, "", 1, MSG_NOSIGNAL, &s->sa.sa, SALEN(s->sa.sa)) == -1) {
1177 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself");
1180 // Wait for the main thread to finish
1181 pthread_mutex_unlock(&(mesh->mesh_mutex));
1182 pthread_join(mesh->thread, NULL);
1183 pthread_mutex_lock(&(mesh->mesh_mutex));
1185 mesh->threadstarted = false;
1187 // Close all metaconnections
1188 if(mesh->connections) {
1189 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1191 connection_t *c = node->data;
1193 terminate_connection(mesh, c, false);
1197 if(mesh->outgoings) {
1198 list_delete_list(mesh->outgoings);
1201 mesh->outgoings = NULL;
1203 pthread_mutex_unlock(&(mesh->mesh_mutex));
1206 void meshlink_close(meshlink_handle_t *mesh) {
1207 if(!mesh || !mesh->confbase) {
1208 meshlink_errno = MESHLINK_EINVAL;
1212 // stop can be called even if mesh has not been started
1213 meshlink_stop(mesh);
1215 // lock is not released after this
1216 pthread_mutex_lock(&(mesh->mesh_mutex));
1218 // Close and free all resources used.
1220 close_network_connections(mesh);
1222 logger(mesh, MESHLINK_INFO, "Terminating");
1224 exit_configuration(&mesh->config);
1225 event_loop_exit(&mesh->loop);
1229 if(mesh->confbase) {
1235 ecdsa_free(mesh->invitation_key);
1238 free(mesh->appname);
1239 free(mesh->confbase);
1240 pthread_mutex_destroy(&(mesh->mesh_mutex));
1242 memset(mesh, 0, sizeof(*mesh));
1247 static void deltree(const char *dirname) {
1248 DIR *d = opendir(dirname);
1253 while((ent = readdir(d))) {
1254 if(ent->d_name[0] == '.') {
1258 char filename[PATH_MAX];
1259 snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
1261 if(unlink(filename)) {
1273 bool meshlink_destroy(const char *confbase) {
1275 meshlink_errno = MESHLINK_EINVAL;
1279 char filename[PATH_MAX];
1280 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1282 if(unlink(filename)) {
1283 if(errno == ENOENT) {
1284 meshlink_errno = MESHLINK_ENOENT;
1287 logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
1288 meshlink_errno = MESHLINK_ESTORAGE;
1298 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1300 meshlink_errno = MESHLINK_EINVAL;
1304 pthread_mutex_lock(&(mesh->mesh_mutex));
1305 mesh->receive_cb = cb;
1306 pthread_mutex_unlock(&(mesh->mesh_mutex));
1309 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1311 meshlink_errno = MESHLINK_EINVAL;
1315 pthread_mutex_lock(&(mesh->mesh_mutex));
1316 mesh->node_status_cb = cb;
1317 pthread_mutex_unlock(&(mesh->mesh_mutex));
1320 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1322 pthread_mutex_lock(&(mesh->mesh_mutex));
1324 mesh->log_level = cb ? level : 0;
1325 pthread_mutex_unlock(&(mesh->mesh_mutex));
1328 global_log_level = cb ? level : 0;
1332 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1333 meshlink_packethdr_t *hdr;
1335 // Validate arguments
1336 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1337 meshlink_errno = MESHLINK_EINVAL;
1346 meshlink_errno = MESHLINK_EINVAL;
1350 // Prepare the packet
1351 vpn_packet_t *packet = malloc(sizeof(*packet));
1354 meshlink_errno = MESHLINK_ENOMEM;
1358 packet->probe = false;
1359 packet->tcp = false;
1360 packet->len = len + sizeof(*hdr);
1362 hdr = (meshlink_packethdr_t *)packet->data;
1363 memset(hdr, 0, sizeof(*hdr));
1364 // leave the last byte as 0 to make sure strings are always
1365 // null-terminated if they are longer than the buffer
1366 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1367 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1369 memcpy(packet->data + sizeof(*hdr), data, len);
1372 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1374 meshlink_errno = MESHLINK_ENOMEM;
1378 // Notify event loop
1379 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1384 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1386 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1392 mesh->self->in_packets++;
1393 mesh->self->in_bytes += packet->len;
1394 route(mesh, mesh->self, packet);
1397 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1398 if(!mesh || !destination) {
1399 meshlink_errno = MESHLINK_EINVAL;
1403 pthread_mutex_lock(&(mesh->mesh_mutex));
1405 node_t *n = (node_t *)destination;
1407 if(!n->status.reachable) {
1408 pthread_mutex_unlock(&(mesh->mesh_mutex));
1411 } else if(n->mtuprobes > 30 && n->minmtu) {
1412 pthread_mutex_unlock(&(mesh->mesh_mutex));
1415 pthread_mutex_unlock(&(mesh->mesh_mutex));
1420 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1421 if(!mesh || !node) {
1422 meshlink_errno = MESHLINK_EINVAL;
1426 pthread_mutex_lock(&(mesh->mesh_mutex));
1428 node_t *n = (node_t *)node;
1430 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1431 meshlink_errno = MESHLINK_EINTERNAL;
1432 pthread_mutex_unlock(&(mesh->mesh_mutex));
1436 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1439 meshlink_errno = MESHLINK_EINTERNAL;
1442 pthread_mutex_unlock(&(mesh->mesh_mutex));
1446 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1448 meshlink_errno = MESHLINK_EINVAL;
1452 return (meshlink_node_t *)mesh->self;
1455 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1456 if(!mesh || !name) {
1457 meshlink_errno = MESHLINK_EINVAL;
1461 meshlink_node_t *node = NULL;
1463 pthread_mutex_lock(&(mesh->mesh_mutex));
1464 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1465 pthread_mutex_unlock(&(mesh->mesh_mutex));
1469 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1470 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1471 meshlink_errno = MESHLINK_EINVAL;
1475 meshlink_node_t **result;
1478 pthread_mutex_lock(&(mesh->mesh_mutex));
1480 *nmemb = mesh->nodes->count;
1481 result = realloc(nodes, *nmemb * sizeof(*nodes));
1484 meshlink_node_t **p = result;
1486 for splay_each(node_t, n, mesh->nodes) {
1487 *p++ = (meshlink_node_t *)n;
1492 meshlink_errno = MESHLINK_ENOMEM;
1495 pthread_mutex_unlock(&(mesh->mesh_mutex));
1500 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1501 if(!mesh || !data || !len || !signature || !siglen) {
1502 meshlink_errno = MESHLINK_EINVAL;
1506 if(*siglen < MESHLINK_SIGLEN) {
1507 meshlink_errno = MESHLINK_EINVAL;
1511 pthread_mutex_lock(&(mesh->mesh_mutex));
1513 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1514 meshlink_errno = MESHLINK_EINTERNAL;
1515 pthread_mutex_unlock(&(mesh->mesh_mutex));
1519 *siglen = MESHLINK_SIGLEN;
1520 pthread_mutex_unlock(&(mesh->mesh_mutex));
1524 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1525 if(!mesh || !data || !len || !signature) {
1526 meshlink_errno = MESHLINK_EINVAL;
1530 if(siglen != MESHLINK_SIGLEN) {
1531 meshlink_errno = MESHLINK_EINVAL;
1535 pthread_mutex_lock(&(mesh->mesh_mutex));
1539 struct node_t *n = (struct node_t *)source;
1540 node_read_ecdsa_public_key(mesh, n);
1543 meshlink_errno = MESHLINK_EINTERNAL;
1546 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1549 pthread_mutex_unlock(&(mesh->mesh_mutex));
1553 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1554 char filename[PATH_MAX];
1556 pthread_mutex_lock(&(mesh->mesh_mutex));
1558 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
1560 if(mkdir(filename, 0700) && errno != EEXIST) {
1561 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1562 meshlink_errno = MESHLINK_ESTORAGE;
1563 pthread_mutex_unlock(&(mesh->mesh_mutex));
1567 // Count the number of valid invitations, clean up old ones
1568 DIR *dir = opendir(filename);
1571 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1572 meshlink_errno = MESHLINK_ESTORAGE;
1573 pthread_mutex_unlock(&(mesh->mesh_mutex));
1580 time_t deadline = time(NULL) - 604800; // 1 week in the past
1582 while((ent = readdir(dir))) {
1583 if(strlen(ent->d_name) != 24) {
1587 char invname[PATH_MAX];
1589 if (snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) {
1590 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name);
1594 if(!stat(invname, &st)) {
1595 if(mesh->invitation_key && deadline < st.st_mtime) {
1601 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1607 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1609 meshlink_errno = MESHLINK_ESTORAGE;
1610 pthread_mutex_unlock(&(mesh->mesh_mutex));
1616 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1618 // Remove the key if there are no outstanding invitations.
1622 if(mesh->invitation_key) {
1623 ecdsa_free(mesh->invitation_key);
1624 mesh->invitation_key = NULL;
1628 if(mesh->invitation_key) {
1629 pthread_mutex_unlock(&(mesh->mesh_mutex));
1633 // Create a new key if necessary.
1634 FILE *f = fopen(filename, "rb");
1637 if(errno != ENOENT) {
1638 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1639 meshlink_errno = MESHLINK_ESTORAGE;
1640 pthread_mutex_unlock(&(mesh->mesh_mutex));
1644 mesh->invitation_key = ecdsa_generate();
1646 if(!mesh->invitation_key) {
1647 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1648 meshlink_errno = MESHLINK_EINTERNAL;
1649 pthread_mutex_unlock(&(mesh->mesh_mutex));
1653 f = fopen(filename, "wb");
1656 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1657 meshlink_errno = MESHLINK_ESTORAGE;
1658 pthread_mutex_unlock(&(mesh->mesh_mutex));
1662 chmod(filename, 0600);
1663 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1666 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1669 if(!mesh->invitation_key) {
1670 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1671 meshlink_errno = MESHLINK_ESTORAGE;
1675 pthread_mutex_unlock(&(mesh->mesh_mutex));
1676 return mesh->invitation_key;
1679 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1680 if(!mesh || !address) {
1681 meshlink_errno = MESHLINK_EINVAL;
1685 if(!is_valid_hostname(address)) {
1686 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1687 meshlink_errno = MESHLINK_EINVAL;
1693 pthread_mutex_lock(&(mesh->mesh_mutex));
1694 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1695 pthread_mutex_unlock(&(mesh->mesh_mutex));
1700 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1702 meshlink_errno = MESHLINK_EINVAL;
1706 char *address = meshlink_get_external_address(mesh);
1714 pthread_mutex_lock(&(mesh->mesh_mutex));
1715 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1716 pthread_mutex_unlock(&(mesh->mesh_mutex));
1722 int meshlink_get_port(meshlink_handle_t *mesh) {
1724 meshlink_errno = MESHLINK_EINVAL;
1729 meshlink_errno = MESHLINK_EINTERNAL;
1733 return atoi(mesh->myport);
1736 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1737 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1738 meshlink_errno = MESHLINK_EINVAL;
1742 if(mesh->myport && port == atoi(mesh->myport)) {
1746 if(!try_bind(port)) {
1747 meshlink_errno = MESHLINK_ENETWORK;
1753 pthread_mutex_lock(&(mesh->mesh_mutex));
1755 if(mesh->threadstarted) {
1756 meshlink_errno = MESHLINK_EINVAL;
1760 close_network_connections(mesh);
1761 exit_configuration(&mesh->config);
1764 snprintf(portstr, sizeof(portstr), "%d", port);
1765 portstr[sizeof(portstr) - 1] = 0;
1767 modify_config_file(mesh, mesh->name, "Port", portstr, true);
1769 init_configuration(&mesh->config);
1771 if(!read_server_config(mesh)) {
1772 meshlink_errno = MESHLINK_ESTORAGE;
1773 } else if(!setup_network(mesh)) {
1774 meshlink_errno = MESHLINK_ENETWORK;
1780 pthread_mutex_unlock(&(mesh->mesh_mutex));
1785 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1787 meshlink_errno = MESHLINK_EINVAL;
1791 pthread_mutex_lock(&(mesh->mesh_mutex));
1793 // Check validity of the new node's name
1794 if(!check_id(name)) {
1795 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1796 meshlink_errno = MESHLINK_EINVAL;
1797 pthread_mutex_unlock(&(mesh->mesh_mutex));
1801 // Ensure no host configuration file with that name exists
1802 char filename[PATH_MAX];
1803 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1805 if(!access(filename, F_OK)) {
1806 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1807 meshlink_errno = MESHLINK_EEXIST;
1808 pthread_mutex_unlock(&(mesh->mesh_mutex));
1812 // Ensure no other nodes know about this name
1813 if(meshlink_get_node(mesh, name)) {
1814 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1815 meshlink_errno = MESHLINK_EEXIST;
1816 pthread_mutex_unlock(&(mesh->mesh_mutex));
1820 // Get the local address
1821 char *address = get_my_hostname(mesh);
1824 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1825 meshlink_errno = MESHLINK_ERESOLV;
1826 pthread_mutex_unlock(&(mesh->mesh_mutex));
1830 if(!refresh_invitation_key(mesh)) {
1831 meshlink_errno = MESHLINK_EINTERNAL;
1832 pthread_mutex_unlock(&(mesh->mesh_mutex));
1838 // Create a hash of the key.
1839 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1840 sha512(fingerprint, strlen(fingerprint), hash);
1841 b64encode_urlsafe(hash, hash, 18);
1843 // Create a random cookie for this invitation.
1845 randomize(cookie, 18);
1847 // Create a filename that doesn't reveal the cookie itself
1848 char buf[18 + strlen(fingerprint)];
1849 char cookiehash[64];
1850 memcpy(buf, cookie, 18);
1851 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
1852 sha512(buf, sizeof(buf), cookiehash);
1853 b64encode_urlsafe(cookiehash, cookiehash, 18);
1855 b64encode_urlsafe(cookie, cookie, 18);
1859 // Create a file containing the details of the invitation.
1860 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1861 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1864 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1865 meshlink_errno = MESHLINK_ESTORAGE;
1866 pthread_mutex_unlock(&(mesh->mesh_mutex));
1870 FILE *f = fdopen(ifd, "w");
1876 // Fill in the details.
1877 fprintf(f, "Name = %s\n", name);
1879 // fprintf(f, "NetName = %s\n", netname);
1880 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1882 // Copy Broadcast and Mode
1883 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
1884 FILE *tc = fopen(filename, "r");
1889 while(fgets(buf, sizeof(buf), tc)) {
1890 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1891 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1894 // Make sure there is a newline character.
1895 if(!strchr(buf, '\n')) {
1903 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1904 meshlink_errno = MESHLINK_ESTORAGE;
1905 pthread_mutex_unlock(&(mesh->mesh_mutex));
1909 fprintf(f, "#---------------------------------------------------------------#\n");
1910 fprintf(f, "Name = %s\n", mesh->self->name);
1912 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1916 // Create an URL from the local address, key hash and cookie
1918 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1921 pthread_mutex_unlock(&(mesh->mesh_mutex));
1925 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1926 if(!mesh || !invitation) {
1927 meshlink_errno = MESHLINK_EINVAL;
1931 pthread_mutex_lock(&(mesh->mesh_mutex));
1933 //Before doing meshlink_join make sure we are not connected to another mesh
1934 if(mesh->threadstarted) {
1935 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
1936 meshlink_errno = MESHLINK_EINVAL;
1937 pthread_mutex_unlock(&(mesh->mesh_mutex));
1941 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
1942 char copy[strlen(invitation) + 1];
1943 strcpy(copy, invitation);
1945 // Split the invitation URL into hostname, port, key hash and cookie.
1947 char *slash = strchr(copy, '/');
1955 if(strlen(slash) != 48) {
1959 char *address = copy;
1960 char *port = strrchr(address, ':');
1968 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
1972 // Generate a throw-away key for the invitation.
1973 ecdsa_t *key = ecdsa_generate();
1976 meshlink_errno = MESHLINK_EINTERNAL;
1977 pthread_mutex_unlock(&(mesh->mesh_mutex));
1981 char *b64key = ecdsa_get_base64_public_key(key);
1985 while (address && *address) {
1986 // We allow commas in the address part to support multiple addresses in one invitation URL.
1987 comma = strchr(address, ',');
1991 // IPv6 address are enclosed in brackets, per RFC 3986
1992 if (*address == '[') {
1994 char *bracket = strchr(address, ']');
1998 if (comma && bracket != comma)
2002 // Connect to the meshlink daemon mentioned in the URL.
2003 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2005 for (struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2006 mesh->sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
2008 if(mesh->sock == -1) {
2009 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2010 meshlink_errno = MESHLINK_ENETWORK;
2014 set_timeout(mesh->sock, 5000);
2016 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2017 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2018 meshlink_errno = MESHLINK_ENETWORK;
2019 closesocket(mesh->sock);
2027 meshlink_errno = MESHLINK_ERESOLV;
2030 if (mesh->sock != -1 || !comma)
2036 if (mesh->sock == -1) {
2037 pthread_mutex_unlock(&mesh->mesh_mutex);
2041 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2043 // Tell him we have an invitation, and give him our throw-away key.
2047 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
2048 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2049 closesocket(mesh->sock);
2050 meshlink_errno = MESHLINK_ENETWORK;
2051 pthread_mutex_unlock(&(mesh->mesh_mutex));
2057 char hisname[4096] = "";
2058 int code, hismajor, hisminor = 0;
2060 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) {
2061 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2062 closesocket(mesh->sock);
2063 meshlink_errno = MESHLINK_ENETWORK;
2064 pthread_mutex_unlock(&(mesh->mesh_mutex));
2068 // Check if the hash of the key he gave us matches the hash in the URL.
2069 char *fingerprint = mesh->line + 2;
2072 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2073 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2074 meshlink_errno = MESHLINK_EINTERNAL;
2075 pthread_mutex_unlock(&(mesh->mesh_mutex));
2079 if(memcmp(hishash, mesh->hash, 18)) {
2080 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2081 meshlink_errno = MESHLINK_EPEER;
2082 pthread_mutex_unlock(&(mesh->mesh_mutex));
2087 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2090 meshlink_errno = MESHLINK_EINTERNAL;
2091 pthread_mutex_unlock(&(mesh->mesh_mutex));
2095 // Start an SPTPS session
2096 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2097 meshlink_errno = MESHLINK_EINTERNAL;
2098 pthread_mutex_unlock(&(mesh->mesh_mutex));
2102 // Feed rest of input buffer to SPTPS
2103 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2104 meshlink_errno = MESHLINK_EPEER;
2105 pthread_mutex_unlock(&(mesh->mesh_mutex));
2111 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2113 if(errno == EINTR) {
2117 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2118 meshlink_errno = MESHLINK_ENETWORK;
2119 pthread_mutex_unlock(&(mesh->mesh_mutex));
2123 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2124 meshlink_errno = MESHLINK_EPEER;
2125 pthread_mutex_unlock(&(mesh->mesh_mutex));
2130 sptps_stop(&mesh->sptps);
2133 closesocket(mesh->sock);
2135 if(!mesh->success) {
2136 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2137 meshlink_errno = MESHLINK_EPEER;
2138 pthread_mutex_unlock(&(mesh->mesh_mutex));
2142 pthread_mutex_unlock(&(mesh->mesh_mutex));
2146 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2147 meshlink_errno = MESHLINK_EINVAL;
2148 pthread_mutex_unlock(&(mesh->mesh_mutex));
2152 char *meshlink_export(meshlink_handle_t *mesh) {
2154 meshlink_errno = MESHLINK_EINVAL;
2158 pthread_mutex_lock(&(mesh->mesh_mutex));
2160 char filename[PATH_MAX];
2161 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
2162 FILE *f = fopen(filename, "r");
2165 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
2166 meshlink_errno = MESHLINK_ESTORAGE;
2167 pthread_mutex_unlock(&(mesh->mesh_mutex));
2171 fseek(f, 0, SEEK_END);
2172 int fsize = ftell(f);
2175 size_t len = fsize + 9 + strlen(mesh->self->name);
2176 char *buf = xmalloc(len);
2177 snprintf(buf, len, "Name = %s\n", mesh->self->name);
2179 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
2180 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
2183 meshlink_errno = MESHLINK_ESTORAGE;
2184 pthread_mutex_unlock(&(mesh->mesh_mutex));
2191 pthread_mutex_unlock(&(mesh->mesh_mutex));
2195 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2196 if(!mesh || !data) {
2197 meshlink_errno = MESHLINK_EINVAL;
2201 pthread_mutex_lock(&(mesh->mesh_mutex));
2203 if(strncmp(data, "Name = ", 7)) {
2204 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2205 meshlink_errno = MESHLINK_EPEER;
2206 pthread_mutex_unlock(&(mesh->mesh_mutex));
2210 char *end = strchr(data + 7, '\n');
2213 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2214 meshlink_errno = MESHLINK_EPEER;
2215 pthread_mutex_unlock(&(mesh->mesh_mutex));
2219 int len = end - (data + 7);
2221 memcpy(name, data + 7, len);
2224 if(!check_id(name)) {
2225 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
2226 meshlink_errno = MESHLINK_EPEER;
2227 pthread_mutex_unlock(&(mesh->mesh_mutex));
2231 char filename[PATH_MAX];
2232 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
2234 if(!access(filename, F_OK)) {
2235 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
2236 meshlink_errno = MESHLINK_EEXIST;
2237 pthread_mutex_unlock(&(mesh->mesh_mutex));
2241 if(errno != ENOENT) {
2242 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
2243 meshlink_errno = MESHLINK_ESTORAGE;
2244 pthread_mutex_unlock(&(mesh->mesh_mutex));
2248 FILE *f = fopen(filename, "w");
2251 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
2252 meshlink_errno = MESHLINK_ESTORAGE;
2253 pthread_mutex_unlock(&(mesh->mesh_mutex));
2257 fwrite(end + 1, strlen(end + 1), 1, f);
2260 load_all_nodes(mesh);
2262 pthread_mutex_unlock(&(mesh->mesh_mutex));
2266 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2267 if(!mesh || !node) {
2268 meshlink_errno = MESHLINK_EINVAL;
2272 pthread_mutex_lock(&(mesh->mesh_mutex));
2276 n->status.blacklisted = true;
2277 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2279 //Make blacklisting persistent in the config file
2280 append_config_file(mesh, n->name, "blacklisted", "yes");
2282 pthread_mutex_unlock(&(mesh->mesh_mutex));
2286 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2287 if(!mesh || !node) {
2288 meshlink_errno = MESHLINK_EINVAL;
2292 pthread_mutex_lock(&(mesh->mesh_mutex));
2294 node_t *n = (node_t *)node;
2295 n->status.blacklisted = false;
2297 //TODO: remove blacklisted = yes from the config file
2299 pthread_mutex_unlock(&(mesh->mesh_mutex));
2303 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2304 mesh->default_blacklist = blacklist;
2307 /* Hint that a hostname may be found at an address
2308 * See header file for detailed comment.
2310 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2311 if(!mesh || !node || !addr) {
2315 // Ignore hints about ourself.
2316 if((node_t *)node == mesh->self) {
2320 pthread_mutex_lock(&(mesh->mesh_mutex));
2322 char *host = NULL, *port = NULL, *str = NULL;
2323 sockaddr2str((const sockaddr_t *)addr, &host, &port);
2326 xasprintf(&str, "%s %s", host, port);
2328 if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0)) {
2329 modify_config_file(mesh, node->name, "Address", str, 5);
2331 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
2339 pthread_mutex_unlock(&(mesh->mesh_mutex));
2340 // @TODO do we want to fire off a connection attempt right away?
2343 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2345 node_t *n = utcp->priv;
2346 meshlink_handle_t *mesh = n->mesh;
2347 return mesh->channel_accept_cb;
2350 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2351 meshlink_channel_t *channel = connection->priv;
2357 node_t *n = channel->node;
2358 meshlink_handle_t *mesh = n->mesh;
2360 if(n->status.destroyed) {
2361 meshlink_channel_close(mesh, channel);
2362 } else if(channel->receive_cb) {
2363 channel->receive_cb(mesh, channel, data, len);
2369 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2370 node_t *n = utcp_connection->utcp->priv;
2376 meshlink_handle_t *mesh = n->mesh;
2378 if(!mesh->channel_accept_cb) {
2382 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2384 channel->c = utcp_connection;
2386 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2387 utcp_accept(utcp_connection, channel_recv, channel);
2393 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2394 node_t *n = utcp->priv;
2395 meshlink_handle_t *mesh = n->mesh;
2396 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2399 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2400 if(!mesh || !channel) {
2401 meshlink_errno = MESHLINK_EINVAL;
2405 channel->receive_cb = cb;
2408 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2410 node_t *n = (node_t *)source;
2416 utcp_recv(n->utcp, data, len);
2419 static void channel_poll(struct utcp_connection *connection, size_t len) {
2420 meshlink_channel_t *channel = connection->priv;
2426 node_t *n = channel->node;
2427 meshlink_handle_t *mesh = n->mesh;
2429 if(channel->poll_cb) {
2430 channel->poll_cb(mesh, channel, len);
2434 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2436 channel->poll_cb = cb;
2437 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2440 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2442 meshlink_errno = MESHLINK_EINVAL;
2446 pthread_mutex_lock(&mesh->mesh_mutex);
2447 mesh->channel_accept_cb = cb;
2448 mesh->receive_cb = channel_receive;
2450 for splay_each(node_t, n, mesh->nodes) {
2451 if(!n->utcp && n != mesh->self) {
2452 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2456 pthread_mutex_unlock(&mesh->mesh_mutex);
2459 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) {
2461 abort(); // TODO: handle non-NULL data
2464 if(!mesh || !node) {
2465 meshlink_errno = MESHLINK_EINVAL;
2469 node_t *n = (node_t *)node;
2472 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2473 mesh->receive_cb = channel_receive;
2476 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2481 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2483 channel->receive_cb = cb;
2484 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2487 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2495 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) {
2496 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2499 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2500 if(!mesh || !channel) {
2501 meshlink_errno = MESHLINK_EINVAL;
2505 utcp_shutdown(channel->c, direction);
2508 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2509 if(!mesh || !channel) {
2510 meshlink_errno = MESHLINK_EINVAL;
2514 utcp_close(channel->c);
2518 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2519 if(!mesh || !channel) {
2520 meshlink_errno = MESHLINK_EINVAL;
2529 meshlink_errno = MESHLINK_EINVAL;
2533 // TODO: more finegrained locking.
2534 // Ideally we want to put the data into the UTCP connection's send buffer.
2535 // Then, preferrably only if there is room in the receiver window,
2536 // kick the meshlink thread to go send packets.
2538 pthread_mutex_lock(&mesh->mesh_mutex);
2539 ssize_t retval = utcp_send(channel->c, data, len);
2540 pthread_mutex_unlock(&mesh->mesh_mutex);
2543 meshlink_errno = MESHLINK_ENETWORK;
2549 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2550 if(!mesh || !channel) {
2551 meshlink_errno = MESHLINK_EINVAL;
2555 return channel->c->flags;
2558 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2559 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2560 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2563 if(mesh->node_status_cb) {
2564 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2568 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2570 meshlink_errno = MESHLINK_EINVAL;
2574 pthread_mutex_lock(&mesh->mesh_mutex);
2576 if(mesh->discovery == enable) {
2580 if(mesh->threadstarted) {
2582 discovery_start(mesh);
2584 discovery_stop(mesh);
2588 mesh->discovery = enable;
2591 pthread_mutex_unlock(&mesh->mesh_mutex);
2594 static void __attribute__((constructor)) meshlink_init(void) {
2597 randomize(&seed, sizeof(seed));
2601 static void __attribute__((destructor)) meshlink_exit(void) {
2605 /// Device class traits
2606 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2607 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2608 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2609 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2610 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN