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 {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
61 /* Host configuration */
62 {"CanonicalAddress", VAR_HOST},
63 {"Address", VAR_HOST | VAR_MULTIPLE},
64 {"ECDSAPublicKey", VAR_HOST},
69 static bool fcopy(FILE *out, const char *filename) {
70 FILE *in = fopen(filename, "r");
73 logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
80 while((len = fread(buf, 1, sizeof(buf), in))) {
81 fwrite(buf, len, 1, out);
88 static int rstrip(char *value) {
89 int len = strlen(value);
91 while(len && strchr("\t\r\n ", value[len - 1])) {
98 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
100 bool canonical = false;
102 if(!filename || (*hostname && *port)) {
106 FILE *f = fopen(filename, "r");
112 while(fgets(line, sizeof(line), f)) {
118 p += strcspn(p, "\t =");
124 q = p + strspn(p, "\t ");
127 q += 1 + strspn(q + 1, "\t ");
130 // q is now pointing to the hostname
132 p = q + strcspn(q, "\t ");
138 p += strspn(p, "\t ");
139 p[strcspn(p, "\t ")] = 0;
140 // p is now pointing to the port, if present
142 if(!*port && !strcasecmp(line, "Port")) {
144 } else if(!canonical && !*hostname && !strcasecmp(line, "Address")) {
145 // Check that the hostname is a symbolic name (it's not a numeric IPv4 or IPv6 address)
146 if(!q[strspn(q, "0123456789.")] || strchr(q, ':')) {
150 *hostname = xstrdup(q);
156 } else if(!strcasecmp(line, "CanonicalAddress")) {
157 *hostname = xstrdup(q);
166 if(canonical && *hostname && *port) {
174 static bool is_valid_hostname(const char *hostname) {
179 for(const char *p = hostname; *p; p++) {
180 if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
188 static bool is_valid_port(const char *port) {
195 unsigned long int result = strtoul(port, &end, 10);
196 return result && result < 65536 && !*end;
199 for(const char *p = port; *p; p++) {
200 if(!(isalnum(*p) || *p == '-')) {
208 static void set_timeout(int sock, int timeout) {
213 tv.tv_sec = timeout / 1000;
214 tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
216 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
217 setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
220 // Find out what local address a socket would use if we connect to the given address.
221 // We do this using connect() on a UDP socket, so the kernel has to resolve the address
222 // of both endpoints, but this will actually not send any UDP packet.
223 static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
224 struct addrinfo *rai = NULL;
225 const struct addrinfo hint = {
226 .ai_family = AF_UNSPEC,
227 .ai_socktype = SOCK_DGRAM,
228 .ai_protocol = IPPROTO_UDP,
231 if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
235 int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
242 if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
249 struct sockaddr_storage sn;
250 socklen_t sl = sizeof(sn);
252 if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
256 if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
263 char *meshlink_get_external_address(meshlink_handle_t *mesh) {
264 return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
267 char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
268 char *hostname = NULL;
270 logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
271 struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
272 static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
275 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
276 if(family != AF_UNSPEC && aip->ai_family != family) {
280 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
283 set_timeout(s, 5000);
285 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
292 send(s, request, sizeof(request) - 1, 0);
293 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
298 if(line[len - 1] == '\n') {
302 char *p = strrchr(line, '\n');
305 hostname = xstrdup(p + 1);
321 // Check that the hostname is reasonable
322 if(hostname && !is_valid_hostname(hostname)) {
327 // If there is no hostname, determine the address used for an outgoing connection.
329 char localaddr[NI_MAXHOST];
330 bool success = false;
332 if(family == AF_INET) {
333 success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr));
334 } else if(family == AF_INET6) {
335 success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr));
339 hostname = xstrdup(localaddr);
344 meshlink_errno = MESHLINK_ERESOLV;
350 // This gets the hostname part for use in invitation URLs
351 static char *get_my_hostname(meshlink_handle_t *mesh) {
352 char *hostname[2] = {NULL};
354 char *hostport = NULL;
355 char *name = mesh->self->name;
356 char filename[PATH_MAX] = "";
358 // Use first Address statement in own host config file
359 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
360 scan_for_hostname(filename, &hostname[0], &port);
366 hostname[0] = meshlink_get_external_address_for_family(mesh, AF_INET);
367 hostname[1] = meshlink_get_external_address_for_family(mesh, AF_INET6);
369 if(!hostname[0] && !hostname[1]) {
373 if(hostname[0] && hostname[1] && !strcmp(hostname[0], hostname[1])) {
378 port = xstrdup(mesh->myport);
380 for(int i = 0; i < 2; i++) {
383 xasprintf(&tmphostport, "%s %s", hostname[i], port);
384 append_config_file(mesh, mesh->self->name, "Address", tmphostport);
391 for(int i = 0; i < 2; i++) {
397 xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]" : "%s%s%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i]);
400 hostport = newhostport;
405 xasprintf(&newhostport, "%s:%s", hostport, port);
408 hostport = newhostport;
414 static char *get_line(const char **data) {
415 if(!data || !*data) {
424 static char line[1024];
425 const char *end = strchr(*data, '\n');
426 size_t len = end ? (size_t)(end - *data) : strlen(*data);
428 if(len >= sizeof(line)) {
429 logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
433 if(len && !isprint(**data)) {
437 memcpy(line, *data, len);
449 static char *get_value(const char *data, const char *var) {
450 char *line = get_line(&data);
456 char *sep = line + strcspn(line, " \t=");
457 char *val = sep + strspn(sep, " \t");
460 val += 1 + strspn(val + 1, " \t");
465 if(strcasecmp(line, var)) {
472 static bool try_bind(int port) {
473 struct addrinfo *ai = NULL;
474 struct addrinfo hint = {
475 .ai_flags = AI_PASSIVE,
476 .ai_family = AF_UNSPEC,
477 .ai_socktype = SOCK_STREAM,
478 .ai_protocol = IPPROTO_TCP,
482 snprintf(portstr, sizeof(portstr), "%d", port);
484 if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
489 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
496 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
511 int check_port(meshlink_handle_t *mesh) {
512 for(int i = 0; i < 1000; i++) {
513 int port = 0x1000 + (rand() & 0x7fff);
516 char filename[PATH_MAX];
517 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
518 FILE *f = fopen(filename, "a");
521 meshlink_errno = MESHLINK_ESTORAGE;
522 logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n");
526 fprintf(f, "Port = %d\n", port);
532 meshlink_errno = MESHLINK_ENETWORK;
533 logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
537 static void deltree(const char *dirname) {
538 DIR *d = opendir(dirname);
543 while((ent = readdir(d))) {
544 if(ent->d_name[0] == '.') {
548 char filename[PATH_MAX];
549 snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
551 if(unlink(filename)) {
562 static bool finalize_join(meshlink_handle_t *mesh) {
563 char *name = xstrdup(get_value(mesh->data, "Name"));
566 logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
570 if(!check_id(name)) {
571 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
575 char filename[PATH_MAX];
576 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
578 FILE *f = fopen(filename, "w");
581 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
585 fprintf(f, "Name = %s\n", name);
587 // Wipe all old host config files and invitations
588 snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
591 if(mkdir(filename, 0777) && errno != EEXIST) {
592 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
596 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
599 // Create a new host config file for ourself
600 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
601 FILE *fh = fopen(filename, "w");
604 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
609 // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
610 // Other chunks go unfiltered to their respective host config files
611 const char *p = mesh->data;
614 while((l = get_line(&p))) {
620 // Split line into variable and value
621 int len = strcspn(l, "\t =");
623 value += strspn(value, "\t ");
627 value += strspn(value, "\t ");
633 if(!strcasecmp(l, "Name"))
634 if(strcmp(value, name)) {
638 } else if(!strcasecmp(l, "NetName")) {
642 // Check the list of known variables
646 for(i = 0; variables[i].name; i++) {
647 if(strcasecmp(l, variables[i].name)) {
655 // Ignore unknown and unsafe variables
657 logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
659 } else if(!(variables[i].type & VAR_SAFE)) {
660 logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
664 // Copy the safe variable to the right config file
665 fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
670 while(l && !strcasecmp(l, "Name")) {
671 if(!check_id(value)) {
672 logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
676 if(!strcmp(value, name)) {
677 logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
681 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
682 f = fopen(filename, "w");
685 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
689 while((l = get_line(&p))) {
690 if(!strcmp(l, "#---------------------------------------------------------------#")) {
694 int len = strcspn(l, "\t =");
696 if(len == 4 && !strncasecmp(l, "Name", 4)) {
698 value += strspn(value, "\t ");
702 value += strspn(value, "\t ");
716 char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
723 fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
724 fprintf(fh, "Port = %s\n", mesh->myport);
728 sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
732 free(mesh->self->name);
733 free(mesh->self->connection->name);
734 mesh->name = xstrdup(name);
735 mesh->self->name = xstrdup(name);
736 mesh->self->connection->name = name;
738 logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
740 load_all_nodes(mesh);
745 static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
747 meshlink_handle_t *mesh = handle;
748 const char *ptr = data;
751 int result = send(mesh->sock, ptr, len, 0);
753 if(result == -1 && errno == EINTR) {
755 } else if(result <= 0) {
766 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
767 meshlink_handle_t *mesh = handle;
770 case SPTPS_HANDSHAKE:
771 return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
774 mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
775 memcpy(mesh->data + mesh->thedatalen, msg, len);
776 mesh->thedatalen += len;
777 mesh->data[mesh->thedatalen] = 0;
781 mesh->thedatalen = 0;
782 return finalize_join(mesh);
785 logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
786 shutdown(mesh->sock, SHUT_RDWR);
787 mesh->success = true;
797 static bool recvline(meshlink_handle_t *mesh, size_t len) {
798 char *newline = NULL;
804 while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
805 int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
807 if(result == -1 && errno == EINTR) {
809 } else if(result <= 0) {
813 mesh->blen += result;
816 if((size_t)(newline - mesh->buffer) >= len) {
820 len = newline - mesh->buffer;
822 memcpy(mesh->line, mesh->buffer, len);
824 memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
825 mesh->blen -= len + 1;
829 static bool sendline(int fd, char *format, ...) {
830 static char buffer[4096];
835 va_start(ap, format);
836 blen = vsnprintf(buffer, sizeof(buffer), format, ap);
839 if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
847 int result = send(fd, p, blen, MSG_NOSIGNAL);
849 if(result == -1 && errno == EINTR) {
851 } else if(result <= 0) {
862 static const char *errstr[] = {
863 [MESHLINK_OK] = "No error",
864 [MESHLINK_EINVAL] = "Invalid argument",
865 [MESHLINK_ENOMEM] = "Out of memory",
866 [MESHLINK_ENOENT] = "No such node",
867 [MESHLINK_EEXIST] = "Node already exists",
868 [MESHLINK_EINTERNAL] = "Internal error",
869 [MESHLINK_ERESOLV] = "Could not resolve hostname",
870 [MESHLINK_ESTORAGE] = "Storage error",
871 [MESHLINK_ENETWORK] = "Network error",
872 [MESHLINK_EPEER] = "Error communicating with peer",
875 const char *meshlink_strerror(meshlink_errno_t err) {
876 if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
877 return "Invalid error code";
883 static bool ecdsa_keygen(meshlink_handle_t *mesh) {
886 char pubname[PATH_MAX], privname[PATH_MAX];
888 logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
890 if(!(key = ecdsa_generate())) {
891 logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
892 meshlink_errno = MESHLINK_EINTERNAL;
895 logger(mesh, MESHLINK_DEBUG, "Done.\n");
898 if(snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) {
899 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase);
900 meshlink_errno = MESHLINK_ESTORAGE;
904 f = fopen(privname, "wb");
907 meshlink_errno = MESHLINK_ESTORAGE;
912 fchmod(fileno(f), 0600);
915 if(!ecdsa_write_pem_private_key(key, f)) {
916 logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
919 meshlink_errno = MESHLINK_EINTERNAL;
925 snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
926 f = fopen(pubname, "a");
929 meshlink_errno = MESHLINK_ESTORAGE;
933 char *pubkey = ecdsa_get_base64_public_key(key);
934 fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
943 static struct timeval idle(event_loop_t *loop, void *data) {
945 meshlink_handle_t *mesh = data;
946 struct timeval t, tmin = {3600, 0};
948 for splay_each(node_t, n, mesh->nodes) {
953 t = utcp_timeout(n->utcp);
955 if(timercmp(&t, &tmin, <)) {
963 // Get our local address(es) by simulating connecting to an Internet host.
964 static void add_local_addresses(meshlink_handle_t *mesh) {
965 char host[NI_MAXHOST];
966 char entry[MAX_STRING_SIZE];
970 if(getlocaladdrname("93.184.216.34", host, sizeof(host))) {
971 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
972 append_config_file(mesh, mesh->name, "Address", entry);
977 if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) {
978 snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
979 append_config_file(mesh, mesh->name, "Address", entry);
983 static bool meshlink_setup(meshlink_handle_t *mesh) {
984 if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
985 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
986 meshlink_errno = MESHLINK_ESTORAGE;
990 char filename[PATH_MAX];
991 snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
993 if(mkdir(filename, 0777) && errno != EEXIST) {
994 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
995 meshlink_errno = MESHLINK_ESTORAGE;
999 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
1001 if(!access(filename, F_OK)) {
1002 logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
1003 meshlink_errno = MESHLINK_EEXIST;
1007 FILE *f = fopen(filename, "w");
1010 logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
1011 meshlink_errno = MESHLINK_ESTORAGE;
1015 fprintf(f, "Name = %s\n", mesh->name);
1018 if(!ecdsa_keygen(mesh)) {
1019 meshlink_errno = MESHLINK_EINTERNAL;
1024 if(check_port(mesh) == 0) {
1025 meshlink_errno = MESHLINK_ENETWORK;
1033 meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
1034 // Validate arguments provided by the application
1035 bool usingname = false;
1037 logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
1039 if(!confbase || !*confbase) {
1040 logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
1041 meshlink_errno = MESHLINK_EINVAL;
1045 if(!appname || !*appname) {
1046 logger(NULL, MESHLINK_ERROR, "No appname given!\n");
1047 meshlink_errno = MESHLINK_EINVAL;
1051 if(!name || !*name) {
1052 logger(NULL, MESHLINK_ERROR, "No name given!\n");
1054 } else { //check name only if there is a name != NULL
1056 if(!check_id(name)) {
1057 logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
1058 meshlink_errno = MESHLINK_EINVAL;
1065 if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
1066 logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
1067 meshlink_errno = MESHLINK_EINVAL;
1071 meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
1072 mesh->confbase = xstrdup(confbase);
1073 mesh->appname = xstrdup(appname);
1074 mesh->devclass = devclass;
1075 mesh->discovery = true;
1076 mesh->invitation_timeout = 604800; // 1 week
1079 mesh->name = xstrdup(name);
1083 pthread_mutexattr_t attr;
1084 pthread_mutexattr_init(&attr);
1085 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
1086 pthread_mutex_init(&(mesh->mesh_mutex), &attr);
1088 mesh->threadstarted = false;
1089 event_loop_init(&mesh->loop);
1090 mesh->loop.data = mesh;
1092 meshlink_queue_init(&mesh->outpacketqueue);
1094 // Check whether meshlink.conf already exists
1096 char filename[PATH_MAX];
1097 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1099 if(access(filename, R_OK)) {
1100 if(errno == ENOENT) {
1101 // If not, create it
1102 if(!meshlink_setup(mesh)) {
1103 // meshlink_errno is set by meshlink_setup()
1107 logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
1108 meshlink_close(mesh);
1109 meshlink_errno = MESHLINK_ESTORAGE;
1114 // Read the configuration
1116 init_configuration(&mesh->config);
1118 if(!read_server_config(mesh)) {
1119 meshlink_close(mesh);
1120 meshlink_errno = MESHLINK_ESTORAGE;
1125 struct WSAData wsa_state;
1127 WSAStartup(MAKEWORD(2, 2), &wsa_state);
1131 // Setup up everything
1132 // TODO: we should not open listening sockets yet
1134 if(!setup_network(mesh)) {
1135 meshlink_close(mesh);
1136 meshlink_errno = MESHLINK_ENETWORK;
1140 add_local_addresses(mesh);
1142 idle_set(&mesh->loop, idle, mesh);
1144 logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
1148 static void *meshlink_main_loop(void *arg) {
1149 meshlink_handle_t *mesh = arg;
1151 pthread_mutex_lock(&(mesh->mesh_mutex));
1153 try_outgoing_connections(mesh);
1155 logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
1157 logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
1159 pthread_mutex_unlock(&(mesh->mesh_mutex));
1163 bool meshlink_start(meshlink_handle_t *mesh) {
1165 meshlink_errno = MESHLINK_EINVAL;
1169 logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
1171 pthread_mutex_lock(&(mesh->mesh_mutex));
1173 if(mesh->threadstarted) {
1174 logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
1175 pthread_mutex_unlock(&(mesh->mesh_mutex));
1179 if(mesh->listen_socket[0].tcp.fd < 0) {
1180 logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
1181 meshlink_errno = MESHLINK_ENETWORK;
1185 mesh->thedatalen = 0;
1187 // TODO: open listening sockets first
1189 //Check that a valid name is set
1191 logger(mesh, MESHLINK_DEBUG, "No name given!\n");
1192 meshlink_errno = MESHLINK_EINVAL;
1193 pthread_mutex_unlock(&(mesh->mesh_mutex));
1197 // Start the main thread
1199 event_loop_start(&mesh->loop);
1201 if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
1202 logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
1203 memset(&mesh->thread, 0, sizeof(mesh)->thread);
1204 meshlink_errno = MESHLINK_EINTERNAL;
1205 event_loop_stop(&mesh->loop);
1206 pthread_mutex_unlock(&(mesh->mesh_mutex));
1210 mesh->threadstarted = true;
1212 if(mesh->discovery) {
1213 discovery_start(mesh);
1216 pthread_mutex_unlock(&(mesh->mesh_mutex));
1220 void meshlink_stop(meshlink_handle_t *mesh) {
1222 meshlink_errno = MESHLINK_EINVAL;
1226 pthread_mutex_lock(&(mesh->mesh_mutex));
1227 logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
1230 if(mesh->discovery) {
1231 discovery_stop(mesh);
1234 // Shut down the main thread
1235 event_loop_stop(&mesh->loop);
1237 // Send ourselves a UDP packet to kick the event loop
1238 for(int i = 0; i < mesh->listen_sockets; i++) {
1240 socklen_t salen = sizeof(sa.sa);
1242 if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
1243 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
1247 if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
1248 logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
1252 if(mesh->threadstarted) {
1253 // Wait for the main thread to finish
1254 pthread_mutex_unlock(&(mesh->mesh_mutex));
1255 pthread_join(mesh->thread, NULL);
1256 pthread_mutex_lock(&(mesh->mesh_mutex));
1258 mesh->threadstarted = false;
1261 // Close all metaconnections
1262 if(mesh->connections) {
1263 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
1265 connection_t *c = node->data;
1267 terminate_connection(mesh, c, false);
1271 if(mesh->outgoings) {
1272 list_delete_list(mesh->outgoings);
1273 mesh->outgoings = NULL;
1276 pthread_mutex_unlock(&(mesh->mesh_mutex));
1279 void meshlink_close(meshlink_handle_t *mesh) {
1280 if(!mesh || !mesh->confbase) {
1281 meshlink_errno = MESHLINK_EINVAL;
1285 // stop can be called even if mesh has not been started
1286 meshlink_stop(mesh);
1288 // lock is not released after this
1289 pthread_mutex_lock(&(mesh->mesh_mutex));
1291 // Close and free all resources used.
1293 close_network_connections(mesh);
1295 logger(mesh, MESHLINK_INFO, "Terminating");
1297 exit_configuration(&mesh->config);
1298 event_loop_exit(&mesh->loop);
1302 if(mesh->confbase) {
1308 ecdsa_free(mesh->invitation_key);
1311 free(mesh->appname);
1312 free(mesh->confbase);
1313 pthread_mutex_destroy(&(mesh->mesh_mutex));
1315 memset(mesh, 0, sizeof(*mesh));
1320 bool meshlink_destroy(const char *confbase) {
1322 meshlink_errno = MESHLINK_EINVAL;
1326 char filename[PATH_MAX];
1327 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
1329 if(unlink(filename)) {
1330 if(errno == ENOENT) {
1331 meshlink_errno = MESHLINK_ENOENT;
1334 logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
1335 meshlink_errno = MESHLINK_ESTORAGE;
1345 void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
1347 meshlink_errno = MESHLINK_EINVAL;
1351 pthread_mutex_lock(&(mesh->mesh_mutex));
1352 mesh->receive_cb = cb;
1353 pthread_mutex_unlock(&(mesh->mesh_mutex));
1356 void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
1358 meshlink_errno = MESHLINK_EINVAL;
1362 pthread_mutex_lock(&(mesh->mesh_mutex));
1363 mesh->node_status_cb = cb;
1364 pthread_mutex_unlock(&(mesh->mesh_mutex));
1367 void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
1369 pthread_mutex_lock(&(mesh->mesh_mutex));
1371 mesh->log_level = cb ? level : 0;
1372 pthread_mutex_unlock(&(mesh->mesh_mutex));
1375 global_log_level = cb ? level : 0;
1379 bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
1380 meshlink_packethdr_t *hdr;
1382 // Validate arguments
1383 if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
1384 meshlink_errno = MESHLINK_EINVAL;
1393 meshlink_errno = MESHLINK_EINVAL;
1397 // Prepare the packet
1398 vpn_packet_t *packet = malloc(sizeof(*packet));
1401 meshlink_errno = MESHLINK_ENOMEM;
1405 packet->probe = false;
1406 packet->tcp = false;
1407 packet->len = len + sizeof(*hdr);
1409 hdr = (meshlink_packethdr_t *)packet->data;
1410 memset(hdr, 0, sizeof(*hdr));
1411 // leave the last byte as 0 to make sure strings are always
1412 // null-terminated if they are longer than the buffer
1413 strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
1414 strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
1416 memcpy(packet->data + sizeof(*hdr), data, len);
1419 if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
1421 meshlink_errno = MESHLINK_ENOMEM;
1425 // Notify event loop
1426 signal_trigger(&(mesh->loop), &(mesh->datafromapp));
1431 void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
1433 vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
1439 mesh->self->in_packets++;
1440 mesh->self->in_bytes += packet->len;
1441 route(mesh, mesh->self, packet);
1444 ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
1445 if(!mesh || !destination) {
1446 meshlink_errno = MESHLINK_EINVAL;
1450 pthread_mutex_lock(&(mesh->mesh_mutex));
1452 node_t *n = (node_t *)destination;
1454 if(!n->status.reachable) {
1455 pthread_mutex_unlock(&(mesh->mesh_mutex));
1458 } else if(n->mtuprobes > 30 && n->minmtu) {
1459 pthread_mutex_unlock(&(mesh->mesh_mutex));
1462 pthread_mutex_unlock(&(mesh->mesh_mutex));
1467 char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
1468 if(!mesh || !node) {
1469 meshlink_errno = MESHLINK_EINVAL;
1473 pthread_mutex_lock(&(mesh->mesh_mutex));
1475 node_t *n = (node_t *)node;
1477 if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
1478 meshlink_errno = MESHLINK_EINTERNAL;
1479 pthread_mutex_unlock(&(mesh->mesh_mutex));
1483 char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
1486 meshlink_errno = MESHLINK_EINTERNAL;
1489 pthread_mutex_unlock(&(mesh->mesh_mutex));
1493 meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
1495 meshlink_errno = MESHLINK_EINVAL;
1499 return (meshlink_node_t *)mesh->self;
1502 meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
1503 if(!mesh || !name) {
1504 meshlink_errno = MESHLINK_EINVAL;
1508 meshlink_node_t *node = NULL;
1510 pthread_mutex_lock(&(mesh->mesh_mutex));
1511 node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
1512 pthread_mutex_unlock(&(mesh->mesh_mutex));
1516 meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
1517 if(!mesh || !nmemb || (*nmemb && !nodes)) {
1518 meshlink_errno = MESHLINK_EINVAL;
1522 meshlink_node_t **result;
1525 pthread_mutex_lock(&(mesh->mesh_mutex));
1527 *nmemb = mesh->nodes->count;
1528 result = realloc(nodes, *nmemb * sizeof(*nodes));
1531 meshlink_node_t **p = result;
1533 for splay_each(node_t, n, mesh->nodes) {
1534 *p++ = (meshlink_node_t *)n;
1539 meshlink_errno = MESHLINK_ENOMEM;
1542 pthread_mutex_unlock(&(mesh->mesh_mutex));
1547 bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
1548 if(!mesh || !data || !len || !signature || !siglen) {
1549 meshlink_errno = MESHLINK_EINVAL;
1553 if(*siglen < MESHLINK_SIGLEN) {
1554 meshlink_errno = MESHLINK_EINVAL;
1558 pthread_mutex_lock(&(mesh->mesh_mutex));
1560 if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
1561 meshlink_errno = MESHLINK_EINTERNAL;
1562 pthread_mutex_unlock(&(mesh->mesh_mutex));
1566 *siglen = MESHLINK_SIGLEN;
1567 pthread_mutex_unlock(&(mesh->mesh_mutex));
1571 bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
1572 if(!mesh || !data || !len || !signature) {
1573 meshlink_errno = MESHLINK_EINVAL;
1577 if(siglen != MESHLINK_SIGLEN) {
1578 meshlink_errno = MESHLINK_EINVAL;
1582 pthread_mutex_lock(&(mesh->mesh_mutex));
1586 struct node_t *n = (struct node_t *)source;
1587 node_read_ecdsa_public_key(mesh, n);
1590 meshlink_errno = MESHLINK_EINTERNAL;
1593 rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
1596 pthread_mutex_unlock(&(mesh->mesh_mutex));
1600 static bool refresh_invitation_key(meshlink_handle_t *mesh) {
1601 char filename[PATH_MAX];
1603 pthread_mutex_lock(&(mesh->mesh_mutex));
1605 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
1607 if(mkdir(filename, 0700) && errno != EEXIST) {
1608 logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
1609 meshlink_errno = MESHLINK_ESTORAGE;
1610 pthread_mutex_unlock(&(mesh->mesh_mutex));
1614 // Count the number of valid invitations, clean up old ones
1615 DIR *dir = opendir(filename);
1618 logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
1619 meshlink_errno = MESHLINK_ESTORAGE;
1620 pthread_mutex_unlock(&(mesh->mesh_mutex));
1627 time_t deadline = time(NULL) - 604800; // 1 week in the past
1629 while((ent = readdir(dir))) {
1630 if(strlen(ent->d_name) != 24) {
1634 char invname[PATH_MAX];
1637 if(snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) {
1638 logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name);
1642 if(!stat(invname, &st)) {
1643 if(mesh->invitation_key && deadline < st.st_mtime) {
1649 logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
1655 logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
1657 meshlink_errno = MESHLINK_ESTORAGE;
1658 pthread_mutex_unlock(&(mesh->mesh_mutex));
1664 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
1666 // Remove the key if there are no outstanding invitations.
1670 if(mesh->invitation_key) {
1671 ecdsa_free(mesh->invitation_key);
1672 mesh->invitation_key = NULL;
1676 if(mesh->invitation_key) {
1677 pthread_mutex_unlock(&(mesh->mesh_mutex));
1681 // Create a new key if necessary.
1682 FILE *f = fopen(filename, "rb");
1685 if(errno != ENOENT) {
1686 logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
1687 meshlink_errno = MESHLINK_ESTORAGE;
1688 pthread_mutex_unlock(&(mesh->mesh_mutex));
1692 mesh->invitation_key = ecdsa_generate();
1694 if(!mesh->invitation_key) {
1695 logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
1696 meshlink_errno = MESHLINK_EINTERNAL;
1697 pthread_mutex_unlock(&(mesh->mesh_mutex));
1701 f = fopen(filename, "wb");
1704 logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
1705 meshlink_errno = MESHLINK_ESTORAGE;
1706 pthread_mutex_unlock(&(mesh->mesh_mutex));
1710 chmod(filename, 0600);
1711 ecdsa_write_pem_private_key(mesh->invitation_key, f);
1714 mesh->invitation_key = ecdsa_read_pem_private_key(f);
1717 if(!mesh->invitation_key) {
1718 logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
1719 meshlink_errno = MESHLINK_ESTORAGE;
1723 pthread_mutex_unlock(&(mesh->mesh_mutex));
1724 return mesh->invitation_key;
1727 bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
1728 if(!mesh || !node || !address) {
1729 meshlink_errno = MESHLINK_EINVAL;
1733 if(!is_valid_hostname(address)) {
1734 logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
1735 meshlink_errno = MESHLINK_EINVAL;
1739 if(port && !is_valid_port(port)) {
1740 logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
1741 meshlink_errno = MESHLINK_EINVAL;
1745 char *canonical_address;
1748 xasprintf(&canonical_address, "%s %s", address, port);
1750 canonical_address = xstrdup(address);
1753 pthread_mutex_lock(&(mesh->mesh_mutex));
1754 bool rval = modify_config_file(mesh, node->name, "CanonicalAddress", canonical_address, 1);
1755 pthread_mutex_unlock(&(mesh->mesh_mutex));
1757 free(canonical_address);
1761 bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
1762 return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
1765 bool meshlink_add_external_address(meshlink_handle_t *mesh) {
1767 meshlink_errno = MESHLINK_EINVAL;
1771 char *address = meshlink_get_external_address(mesh);
1779 pthread_mutex_lock(&(mesh->mesh_mutex));
1780 rval = append_config_file(mesh, mesh->self->name, "Address", address);
1781 pthread_mutex_unlock(&(mesh->mesh_mutex));
1787 int meshlink_get_port(meshlink_handle_t *mesh) {
1789 meshlink_errno = MESHLINK_EINVAL;
1794 meshlink_errno = MESHLINK_EINTERNAL;
1798 return atoi(mesh->myport);
1801 bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
1802 if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
1803 meshlink_errno = MESHLINK_EINVAL;
1807 if(mesh->myport && port == atoi(mesh->myport)) {
1811 if(!try_bind(port)) {
1812 meshlink_errno = MESHLINK_ENETWORK;
1818 pthread_mutex_lock(&(mesh->mesh_mutex));
1820 if(mesh->threadstarted) {
1821 meshlink_errno = MESHLINK_EINVAL;
1825 close_network_connections(mesh);
1826 exit_configuration(&mesh->config);
1829 snprintf(portstr, sizeof(portstr), "%d", port);
1830 portstr[sizeof(portstr) - 1] = 0;
1832 modify_config_file(mesh, mesh->name, "Port", portstr, true);
1834 init_configuration(&mesh->config);
1836 if(!read_server_config(mesh)) {
1837 meshlink_errno = MESHLINK_ESTORAGE;
1838 } else if(!setup_network(mesh)) {
1839 meshlink_errno = MESHLINK_ENETWORK;
1845 pthread_mutex_unlock(&(mesh->mesh_mutex));
1850 void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
1851 mesh->invitation_timeout = timeout;
1854 char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
1856 meshlink_errno = MESHLINK_EINVAL;
1860 pthread_mutex_lock(&(mesh->mesh_mutex));
1862 // Check validity of the new node's name
1863 if(!check_id(name)) {
1864 logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
1865 meshlink_errno = MESHLINK_EINVAL;
1866 pthread_mutex_unlock(&(mesh->mesh_mutex));
1870 // Ensure no host configuration file with that name exists
1871 char filename[PATH_MAX];
1872 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
1874 if(!access(filename, F_OK)) {
1875 logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
1876 meshlink_errno = MESHLINK_EEXIST;
1877 pthread_mutex_unlock(&(mesh->mesh_mutex));
1881 // Ensure no other nodes know about this name
1882 if(meshlink_get_node(mesh, name)) {
1883 logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
1884 meshlink_errno = MESHLINK_EEXIST;
1885 pthread_mutex_unlock(&(mesh->mesh_mutex));
1889 // Get the local address
1890 char *address = get_my_hostname(mesh);
1893 logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
1894 meshlink_errno = MESHLINK_ERESOLV;
1895 pthread_mutex_unlock(&(mesh->mesh_mutex));
1899 if(!refresh_invitation_key(mesh)) {
1900 meshlink_errno = MESHLINK_EINTERNAL;
1901 pthread_mutex_unlock(&(mesh->mesh_mutex));
1907 // Create a hash of the key.
1908 char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
1909 sha512(fingerprint, strlen(fingerprint), hash);
1910 b64encode_urlsafe(hash, hash, 18);
1912 // Create a random cookie for this invitation.
1914 randomize(cookie, 18);
1916 // Create a filename that doesn't reveal the cookie itself
1917 char buf[18 + strlen(fingerprint)];
1918 char cookiehash[64];
1919 memcpy(buf, cookie, 18);
1920 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
1921 sha512(buf, sizeof(buf), cookiehash);
1922 b64encode_urlsafe(cookiehash, cookiehash, 18);
1924 b64encode_urlsafe(cookie, cookie, 18);
1928 // Create a file containing the details of the invitation.
1929 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
1930 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
1933 logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
1934 meshlink_errno = MESHLINK_ESTORAGE;
1935 pthread_mutex_unlock(&(mesh->mesh_mutex));
1939 FILE *f = fdopen(ifd, "w");
1945 // Fill in the details.
1946 fprintf(f, "Name = %s\n", name);
1947 fprintf(f, "ConnectTo = %s\n", mesh->self->name);
1949 // Copy Broadcast and Mode
1950 snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
1951 FILE *tc = fopen(filename, "r");
1956 while(fgets(buf, sizeof(buf), tc)) {
1957 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
1958 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
1961 // Make sure there is a newline character.
1962 if(!strchr(buf, '\n')) {
1970 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
1971 meshlink_errno = MESHLINK_ESTORAGE;
1972 pthread_mutex_unlock(&(mesh->mesh_mutex));
1976 fprintf(f, "#---------------------------------------------------------------#\n");
1977 fprintf(f, "Name = %s\n", mesh->self->name);
1979 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
1983 // Create an URL from the local address, key hash and cookie
1985 xasprintf(&url, "%s/%s%s", address, hash, cookie);
1988 pthread_mutex_unlock(&(mesh->mesh_mutex));
1992 bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
1993 if(!mesh || !invitation) {
1994 meshlink_errno = MESHLINK_EINVAL;
1998 pthread_mutex_lock(&(mesh->mesh_mutex));
2000 //Before doing meshlink_join make sure we are not connected to another mesh
2001 if(mesh->threadstarted) {
2002 logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
2003 meshlink_errno = MESHLINK_EINVAL;
2004 pthread_mutex_unlock(&(mesh->mesh_mutex));
2008 //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
2009 char copy[strlen(invitation) + 1];
2010 strcpy(copy, invitation);
2012 // Split the invitation URL into hostname, port, key hash and cookie.
2014 char *slash = strchr(copy, '/');
2022 if(strlen(slash) != 48) {
2026 char *address = copy;
2027 char *port = strrchr(address, ':');
2035 if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
2039 // Generate a throw-away key for the invitation.
2040 ecdsa_t *key = ecdsa_generate();
2043 meshlink_errno = MESHLINK_EINTERNAL;
2044 pthread_mutex_unlock(&(mesh->mesh_mutex));
2048 char *b64key = ecdsa_get_base64_public_key(key);
2052 while(address && *address) {
2053 // We allow commas in the address part to support multiple addresses in one invitation URL.
2054 comma = strchr(address, ',');
2060 // IPv6 address are enclosed in brackets, per RFC 3986
2061 if(*address == '[') {
2063 char *bracket = strchr(address, ']');
2071 if(comma && bracket != comma) {
2076 // Connect to the meshlink daemon mentioned in the URL.
2077 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
2080 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
2081 mesh->sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
2083 if(mesh->sock == -1) {
2084 logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
2085 meshlink_errno = MESHLINK_ENETWORK;
2089 set_timeout(mesh->sock, 5000);
2091 if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
2092 logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
2093 meshlink_errno = MESHLINK_ENETWORK;
2094 closesocket(mesh->sock);
2102 meshlink_errno = MESHLINK_ERESOLV;
2105 if(mesh->sock != -1 || !comma) {
2112 if(mesh->sock == -1) {
2113 pthread_mutex_unlock(&mesh->mesh_mutex);
2117 logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
2119 // Tell him we have an invitation, and give him our throw-away key.
2123 if(!sendline(mesh->sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
2124 logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
2125 closesocket(mesh->sock);
2126 meshlink_errno = MESHLINK_ENETWORK;
2127 pthread_mutex_unlock(&(mesh->mesh_mutex));
2133 char hisname[4096] = "";
2134 int code, hismajor, hisminor = 0;
2136 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) {
2137 logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
2138 closesocket(mesh->sock);
2139 meshlink_errno = MESHLINK_ENETWORK;
2140 pthread_mutex_unlock(&(mesh->mesh_mutex));
2144 // Check if the hash of the key he gave us matches the hash in the URL.
2145 char *fingerprint = mesh->line + 2;
2148 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
2149 logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
2150 meshlink_errno = MESHLINK_EINTERNAL;
2151 pthread_mutex_unlock(&(mesh->mesh_mutex));
2155 if(memcmp(hishash, mesh->hash, 18)) {
2156 logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
2157 meshlink_errno = MESHLINK_EPEER;
2158 pthread_mutex_unlock(&(mesh->mesh_mutex));
2163 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
2166 meshlink_errno = MESHLINK_EINTERNAL;
2167 pthread_mutex_unlock(&(mesh->mesh_mutex));
2171 // Start an SPTPS session
2172 if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
2173 meshlink_errno = MESHLINK_EINTERNAL;
2174 pthread_mutex_unlock(&(mesh->mesh_mutex));
2178 // Feed rest of input buffer to SPTPS
2179 if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
2180 meshlink_errno = MESHLINK_EPEER;
2181 pthread_mutex_unlock(&(mesh->mesh_mutex));
2187 while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
2189 if(errno == EINTR) {
2193 logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
2194 meshlink_errno = MESHLINK_ENETWORK;
2195 pthread_mutex_unlock(&(mesh->mesh_mutex));
2199 if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
2200 meshlink_errno = MESHLINK_EPEER;
2201 pthread_mutex_unlock(&(mesh->mesh_mutex));
2206 sptps_stop(&mesh->sptps);
2209 closesocket(mesh->sock);
2211 if(!mesh->success) {
2212 logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
2213 meshlink_errno = MESHLINK_EPEER;
2214 pthread_mutex_unlock(&(mesh->mesh_mutex));
2218 pthread_mutex_unlock(&(mesh->mesh_mutex));
2222 logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
2223 meshlink_errno = MESHLINK_EINVAL;
2224 pthread_mutex_unlock(&(mesh->mesh_mutex));
2228 char *meshlink_export(meshlink_handle_t *mesh) {
2230 meshlink_errno = MESHLINK_EINVAL;
2234 pthread_mutex_lock(&(mesh->mesh_mutex));
2236 char filename[PATH_MAX];
2237 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
2238 FILE *f = fopen(filename, "r");
2241 logger(mesh, MESHLINK_DEBUG, "Could not open %s: %s\n", filename, strerror(errno));
2242 meshlink_errno = MESHLINK_ESTORAGE;
2243 pthread_mutex_unlock(&(mesh->mesh_mutex));
2247 fseek(f, 0, SEEK_END);
2248 int fsize = ftell(f);
2251 size_t len = fsize + 9 + strlen(mesh->self->name);
2252 char *buf = xmalloc(len);
2253 snprintf(buf, len, "Name = %s\n", mesh->self->name);
2255 if(fread(buf + len - fsize - 1, fsize, 1, f) != 1) {
2256 logger(mesh, MESHLINK_DEBUG, "Error reading from %s: %s\n", filename, strerror(errno));
2259 meshlink_errno = MESHLINK_ESTORAGE;
2260 pthread_mutex_unlock(&(mesh->mesh_mutex));
2267 pthread_mutex_unlock(&(mesh->mesh_mutex));
2271 bool meshlink_import(meshlink_handle_t *mesh, const char *data) {
2272 if(!mesh || !data) {
2273 meshlink_errno = MESHLINK_EINVAL;
2277 pthread_mutex_lock(&(mesh->mesh_mutex));
2279 if(strncmp(data, "Name = ", 7)) {
2280 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2281 meshlink_errno = MESHLINK_EPEER;
2282 pthread_mutex_unlock(&(mesh->mesh_mutex));
2286 char *end = strchr(data + 7, '\n');
2289 logger(mesh, MESHLINK_DEBUG, "Invalid data\n");
2290 meshlink_errno = MESHLINK_EPEER;
2291 pthread_mutex_unlock(&(mesh->mesh_mutex));
2295 int len = end - (data + 7);
2297 memcpy(name, data + 7, len);
2300 if(!check_id(name)) {
2301 logger(mesh, MESHLINK_DEBUG, "Invalid Name\n");
2302 meshlink_errno = MESHLINK_EPEER;
2303 pthread_mutex_unlock(&(mesh->mesh_mutex));
2307 char filename[PATH_MAX];
2308 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
2310 if(!access(filename, F_OK)) {
2311 logger(mesh, MESHLINK_DEBUG, "File %s already exists, not importing\n", filename);
2312 meshlink_errno = MESHLINK_EEXIST;
2313 pthread_mutex_unlock(&(mesh->mesh_mutex));
2317 if(errno != ENOENT) {
2318 logger(mesh, MESHLINK_DEBUG, "Error accessing %s: %s\n", filename, strerror(errno));
2319 meshlink_errno = MESHLINK_ESTORAGE;
2320 pthread_mutex_unlock(&(mesh->mesh_mutex));
2324 FILE *f = fopen(filename, "w");
2327 logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
2328 meshlink_errno = MESHLINK_ESTORAGE;
2329 pthread_mutex_unlock(&(mesh->mesh_mutex));
2333 fwrite(end + 1, strlen(end + 1), 1, f);
2336 load_all_nodes(mesh);
2338 pthread_mutex_unlock(&(mesh->mesh_mutex));
2342 void meshlink_blacklist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2343 if(!mesh || !node) {
2344 meshlink_errno = MESHLINK_EINVAL;
2348 pthread_mutex_lock(&(mesh->mesh_mutex));
2352 n->status.blacklisted = true;
2353 logger(mesh, MESHLINK_DEBUG, "Blacklisted %s.\n", node->name);
2355 //Make blacklisting persistent in the config file
2356 append_config_file(mesh, n->name, "blacklisted", "yes");
2358 pthread_mutex_unlock(&(mesh->mesh_mutex));
2362 void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
2363 if(!mesh || !node) {
2364 meshlink_errno = MESHLINK_EINVAL;
2368 pthread_mutex_lock(&(mesh->mesh_mutex));
2370 node_t *n = (node_t *)node;
2371 n->status.blacklisted = false;
2373 //TODO: remove blacklisted = yes from the config file
2375 pthread_mutex_unlock(&(mesh->mesh_mutex));
2379 void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
2380 mesh->default_blacklist = blacklist;
2383 /* Hint that a hostname may be found at an address
2384 * See header file for detailed comment.
2386 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
2387 if(!mesh || !node || !addr) {
2391 // Ignore hints about ourself.
2392 if((node_t *)node == mesh->self) {
2396 pthread_mutex_lock(&(mesh->mesh_mutex));
2398 char *host = NULL, *port = NULL, *str = NULL;
2399 sockaddr2str((const sockaddr_t *)addr, &host, &port);
2402 xasprintf(&str, "%s %s", host, port);
2404 if((strncmp("fe80", host, 4) != 0) && (strncmp("127.", host, 4) != 0) && (strcmp("localhost", host) != 0)) {
2405 modify_config_file(mesh, node->name, "Address", str, 5);
2407 logger(mesh, MESHLINK_DEBUG, "Not adding Link Local IPv6 Address to config\n");
2415 pthread_mutex_unlock(&(mesh->mesh_mutex));
2416 // @TODO do we want to fire off a connection attempt right away?
2419 static bool channel_pre_accept(struct utcp *utcp, uint16_t port) {
2421 node_t *n = utcp->priv;
2422 meshlink_handle_t *mesh = n->mesh;
2423 return mesh->channel_accept_cb;
2426 static ssize_t channel_recv(struct utcp_connection *connection, const void *data, size_t len) {
2427 meshlink_channel_t *channel = connection->priv;
2433 node_t *n = channel->node;
2434 meshlink_handle_t *mesh = n->mesh;
2436 if(n->status.destroyed) {
2437 meshlink_channel_close(mesh, channel);
2438 } else if(channel->receive_cb) {
2439 channel->receive_cb(mesh, channel, data, len);
2445 static void channel_accept(struct utcp_connection *utcp_connection, uint16_t port) {
2446 node_t *n = utcp_connection->utcp->priv;
2452 meshlink_handle_t *mesh = n->mesh;
2454 if(!mesh->channel_accept_cb) {
2458 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2460 channel->c = utcp_connection;
2462 if(mesh->channel_accept_cb(mesh, channel, port, NULL, 0)) {
2463 utcp_accept(utcp_connection, channel_recv, channel);
2469 static ssize_t channel_send(struct utcp *utcp, const void *data, size_t len) {
2470 node_t *n = utcp->priv;
2472 if(n->status.destroyed) {
2476 meshlink_handle_t *mesh = n->mesh;
2477 return meshlink_send(mesh, (meshlink_node_t *)n, data, len) ? (ssize_t)len : -1;
2480 void meshlink_set_channel_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_receive_cb_t cb) {
2481 if(!mesh || !channel) {
2482 meshlink_errno = MESHLINK_EINVAL;
2486 channel->receive_cb = cb;
2489 static void channel_receive(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len) {
2491 node_t *n = (node_t *)source;
2497 utcp_recv(n->utcp, data, len);
2500 static void channel_poll(struct utcp_connection *connection, size_t len) {
2501 meshlink_channel_t *channel = connection->priv;
2507 node_t *n = channel->node;
2508 meshlink_handle_t *mesh = n->mesh;
2510 if(channel->poll_cb) {
2511 channel->poll_cb(mesh, channel, len);
2515 void meshlink_set_channel_poll_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, meshlink_channel_poll_cb_t cb) {
2517 channel->poll_cb = cb;
2518 utcp_set_poll_cb(channel->c, cb ? channel_poll : NULL);
2521 void meshlink_set_channel_accept_cb(meshlink_handle_t *mesh, meshlink_channel_accept_cb_t cb) {
2523 meshlink_errno = MESHLINK_EINVAL;
2527 pthread_mutex_lock(&mesh->mesh_mutex);
2528 mesh->channel_accept_cb = cb;
2529 mesh->receive_cb = channel_receive;
2531 for splay_each(node_t, n, mesh->nodes) {
2532 if(!n->utcp && n != mesh->self) {
2533 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2537 pthread_mutex_unlock(&mesh->mesh_mutex);
2540 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) {
2542 abort(); // TODO: handle non-NULL data
2545 if(!mesh || !node) {
2546 meshlink_errno = MESHLINK_EINVAL;
2550 node_t *n = (node_t *)node;
2553 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2554 mesh->receive_cb = channel_receive;
2557 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2562 meshlink_channel_t *channel = xzalloc(sizeof(*channel));
2564 channel->receive_cb = cb;
2565 channel->c = utcp_connect_ex(n->utcp, port, channel_recv, channel, flags);
2568 meshlink_errno = errno == ENOMEM ? MESHLINK_ENOMEM : MESHLINK_EINTERNAL;
2576 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) {
2577 return meshlink_channel_open_ex(mesh, node, port, cb, data, len, MESHLINK_CHANNEL_TCP);
2580 void meshlink_channel_shutdown(meshlink_handle_t *mesh, meshlink_channel_t *channel, int direction) {
2581 if(!mesh || !channel) {
2582 meshlink_errno = MESHLINK_EINVAL;
2586 utcp_shutdown(channel->c, direction);
2589 void meshlink_channel_close(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2590 if(!mesh || !channel) {
2591 meshlink_errno = MESHLINK_EINVAL;
2595 utcp_close(channel->c);
2599 ssize_t meshlink_channel_send(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
2600 if(!mesh || !channel) {
2601 meshlink_errno = MESHLINK_EINVAL;
2610 meshlink_errno = MESHLINK_EINVAL;
2614 // TODO: more finegrained locking.
2615 // Ideally we want to put the data into the UTCP connection's send buffer.
2616 // Then, preferrably only if there is room in the receiver window,
2617 // kick the meshlink thread to go send packets.
2619 pthread_mutex_lock(&mesh->mesh_mutex);
2620 ssize_t retval = utcp_send(channel->c, data, len);
2621 pthread_mutex_unlock(&mesh->mesh_mutex);
2624 meshlink_errno = MESHLINK_ENETWORK;
2630 uint32_t meshlink_channel_get_flags(meshlink_handle_t *mesh, meshlink_channel_t *channel) {
2631 if(!mesh || !channel) {
2632 meshlink_errno = MESHLINK_EINVAL;
2636 return channel->c->flags;
2639 void update_node_status(meshlink_handle_t *mesh, node_t *n) {
2640 if(n->status.reachable && mesh->channel_accept_cb && !n->utcp) {
2641 n->utcp = utcp_init(channel_accept, channel_pre_accept, channel_send, n);
2644 if(mesh->node_status_cb) {
2645 mesh->node_status_cb(mesh, (meshlink_node_t *)n, n->status.reachable);
2649 void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
2651 meshlink_errno = MESHLINK_EINVAL;
2655 pthread_mutex_lock(&mesh->mesh_mutex);
2657 if(mesh->discovery == enable) {
2661 if(mesh->threadstarted) {
2663 discovery_start(mesh);
2665 discovery_stop(mesh);
2669 mesh->discovery = enable;
2672 pthread_mutex_unlock(&mesh->mesh_mutex);
2675 static void __attribute__((constructor)) meshlink_init(void) {
2678 randomize(&seed, sizeof(seed));
2682 static void __attribute__((destructor)) meshlink_exit(void) {
2686 /// Device class traits
2687 dev_class_traits_t dev_class_traits[_DEV_CLASS_MAX + 1] = {
2688 { .min_connects = 3, .max_connects = 10000, .edge_weight = 1 }, // DEV_CLASS_BACKBONE
2689 { .min_connects = 3, .max_connects = 100, .edge_weight = 3 }, // DEV_CLASS_STATIONARY
2690 { .min_connects = 3, .max_connects = 3, .edge_weight = 6 }, // DEV_CLASS_PORTABLE
2691 { .min_connects = 1, .max_connects = 1, .edge_weight = 9 }, // DEV_CLASS_UNKNOWN