+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+__thread meshlink_errno_t meshlink_errno;
+meshlink_log_cb_t global_log_cb;
+meshlink_log_level_t global_log_level;
+
+//TODO: this can go away completely
+const var_t variables[] = {
+ /* Server configuration */
+ {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
+ {"Name", VAR_SERVER},
+ /* Host configuration */
+ {"CanonicalAddress", VAR_HOST},
+ {"Address", VAR_HOST | VAR_MULTIPLE},
+ {"ECDSAPublicKey", VAR_HOST},
+ {"Port", VAR_HOST},
+ {NULL, 0}
+};
+
+static bool fcopy(FILE *out, const char *filename) {
+ FILE *in = fopen(filename, "r");
+
+ if(!in) {
+ logger(NULL, MESHLINK_ERROR, "Could not open %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ char buf[1024];
+ size_t len;
+
+ while((len = fread(buf, 1, sizeof(buf), in))) {
+ fwrite(buf, len, 1, out);
+ }
+
+ fclose(in);
+ return true;
+}
+
+static int rstrip(char *value) {
+ int len = strlen(value);
+
+ while(len && strchr("\t\r\n ", value[len - 1])) {
+ value[--len] = 0;
+ }
+
+ return len;
+}
+
+static void scan_for_hostname(const char *filename, char **hostname, char **port) {
+ char line[4096];
+ bool canonical = false;
+
+ if(!filename || (*hostname && *port)) {
+ return;
+ }
+
+ FILE *f = fopen(filename, "r");
+
+ if(!f) {
+ return;
+ }
+
+ while(fgets(line, sizeof(line), f)) {
+ if(!rstrip(line)) {
+ continue;
+ }
+
+ char *p = line, *q;
+ p += strcspn(p, "\t =");
+
+ if(!*p) {
+ continue;
+ }
+
+ q = p + strspn(p, "\t ");
+
+ if(*q == '=') {
+ q += 1 + strspn(q + 1, "\t ");
+ }
+
+ // q is now pointing to the hostname
+ *p = 0;
+ p = q + strcspn(q, "\t ");
+
+ if(*p) {
+ *p++ = 0;
+ }
+
+ p += strspn(p, "\t ");
+ p[strcspn(p, "\t ")] = 0;
+ // p is now pointing to the port, if present
+
+ if(!*port && !strcasecmp(line, "Port")) {
+ *port = xstrdup(q);
+ } else if(!canonical && !*hostname && !strcasecmp(line, "Address")) {
+ // Check that the hostname is a symbolic name (it's not a numeric IPv4 or IPv6 address)
+ if(!q[strspn(q, "0123456789.")] || strchr(q, ':')) {
+ continue;
+ }
+
+ *hostname = xstrdup(q);
+
+ if(*p) {
+ free(*port);
+ *port = xstrdup(p);
+ }
+ } else if(!strcasecmp(line, "CanonicalAddress")) {
+ *hostname = xstrdup(q);
+ canonical = true;
+
+ if(*p) {
+ free(*port);
+ *port = xstrdup(p);
+ }
+ }
+
+ if(canonical && *hostname && *port) {
+ break;
+ }
+ }
+
+ fclose(f);
+}
+
+static bool is_valid_hostname(const char *hostname) {
+ if(!*hostname) {
+ return false;
+ }
+
+ for(const char *p = hostname; *p; p++) {
+ if(!(isalnum(*p) || *p == '-' || *p == '.' || *p == ':')) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static bool is_valid_port(const char *port) {
+ if(!*port) {
+ return false;
+ }
+
+ if(isdigit(*port)) {
+ char *end;
+ unsigned long int result = strtoul(port, &end, 10);
+ return result && result < 65536 && !*end;
+ }
+
+ for(const char *p = port; *p; p++) {
+ if(!(isalnum(*p) || *p == '-')) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+static void set_timeout(int sock, int timeout) {
+#ifdef _WIN32
+ DWORD tv = timeout;
+#else
+ struct timeval tv;
+ tv.tv_sec = timeout / 1000;
+ tv.tv_usec = (timeout - tv.tv_sec * 1000) * 1000;
+#endif
+ setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
+ setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
+}
+
+// Find out what local address a socket would use if we connect to the given address.
+// We do this using connect() on a UDP socket, so the kernel has to resolve the address
+// of both endpoints, but this will actually not send any UDP packet.
+static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
+ struct addrinfo *rai = NULL;
+ const struct addrinfo hint = {
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_DGRAM,
+ .ai_protocol = IPPROTO_UDP,
+ };
+
+ if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai) {
+ return false;
+ }
+
+ int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
+
+ if(sock == -1) {
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
+ freeaddrinfo(rai);
+ return false;
+ }
+
+ freeaddrinfo(rai);
+
+ struct sockaddr_storage sn;
+ socklen_t sl = sizeof(sn);
+
+ if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
+ return false;
+ }
+
+ if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
+ return false;
+ }
+
+ return true;
+}
+
+char *meshlink_get_external_address(meshlink_handle_t *mesh) {
+ return meshlink_get_external_address_for_family(mesh, AF_UNSPEC);
+}
+
+char *meshlink_get_external_address_for_family(meshlink_handle_t *mesh, int family) {
+ char *hostname = NULL;
+
+ logger(mesh, MESHLINK_DEBUG, "Trying to discover externally visible hostname...\n");
+ struct addrinfo *ai = str2addrinfo("meshlink.io", "80", SOCK_STREAM);
+ static const char request[] = "GET http://www.meshlink.io/host.cgi HTTP/1.0\r\n\r\n";
+ char line[256];
+
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ if(family != AF_UNSPEC && aip->ai_family != family) {
+ continue;
+ }
+
+ int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
+
+ if(s >= 0) {
+ set_timeout(s, 5000);
+
+ if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
+ closesocket(s);
+ s = -1;
+ }
+ }
+
+ if(s >= 0) {
+ send(s, request, sizeof(request) - 1, 0);
+ int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
+
+ if(len > 0) {
+ line[len] = 0;
+
+ if(line[len - 1] == '\n') {
+ line[--len] = 0;
+ }
+
+ char *p = strrchr(line, '\n');
+
+ if(p && p[1]) {
+ hostname = xstrdup(p + 1);
+ }
+ }
+
+ closesocket(s);
+
+ if(hostname) {
+ break;
+ }
+ }
+ }
+
+ if(ai) {
+ freeaddrinfo(ai);
+ }
+
+ // Check that the hostname is reasonable
+ if(hostname && !is_valid_hostname(hostname)) {
+ free(hostname);
+ hostname = NULL;
+ }
+
+ // If there is no hostname, determine the address used for an outgoing connection.
+ if(!hostname) {
+ char localaddr[NI_MAXHOST];
+ bool success = false;
+
+ if(family == AF_INET) {
+ success = getlocaladdrname("93.184.216.34", localaddr, sizeof(localaddr));
+ } else if(family == AF_INET6) {
+ success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr));
+ }
+
+ if(success) {
+ hostname = xstrdup(localaddr);
+ }
+ }
+
+ if(!hostname) {
+ meshlink_errno = MESHLINK_ERESOLV;
+ }
+
+ return hostname;
+}
+
+// This gets the hostname part for use in invitation URLs
+static char *get_my_hostname(meshlink_handle_t *mesh) {
+ char *hostname[2] = {NULL};
+ char *port = NULL;
+ char *hostport = NULL;
+ char *name = mesh->self->name;
+ char filename[PATH_MAX] = "";
+
+ // Use first Address statement in own host config file
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ scan_for_hostname(filename, &hostname[0], &port);
+
+ if(hostname[0]) {
+ goto done;
+ }
+
+ hostname[0] = meshlink_get_external_address_for_family(mesh, AF_INET);
+ hostname[1] = meshlink_get_external_address_for_family(mesh, AF_INET6);
+
+ if(!hostname[0] && !hostname[1]) {
+ return NULL;
+ }
+
+ if(hostname[0] && hostname[1] && !strcmp(hostname[0], hostname[1])) {
+ free(hostname[1]);
+ hostname[1] = NULL;
+ }
+
+ port = xstrdup(mesh->myport);
+
+ for(int i = 0; i < 2; i++) {
+ if(hostname[i]) {
+ char *tmphostport;
+ xasprintf(&tmphostport, "%s %s", hostname[i], port);
+ append_config_file(mesh, mesh->self->name, "Address", tmphostport);
+ free(tmphostport);
+ }
+ }
+
+done:
+
+ for(int i = 0; i < 2; i++) {
+ if(!hostname[i]) {
+ continue;
+ }
+
+ char *newhostport;
+ xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]" : "%s%s%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i]);
+ free(hostname[i]);
+ free(hostport);
+ hostport = newhostport;
+ }
+
+ if(port) {
+ char *newhostport;
+ xasprintf(&newhostport, "%s:%s", hostport, port);
+ free(port);
+ free(hostport);
+ hostport = newhostport;
+ }
+
+ return hostport;
+}
+
+static char *get_line(const char **data) {
+ if(!data || !*data) {
+ return NULL;
+ }
+
+ if(! **data) {
+ *data = NULL;
+ return NULL;
+ }
+
+ static char line[1024];
+ const char *end = strchr(*data, '\n');
+ size_t len = end ? (size_t)(end - *data) : strlen(*data);
+
+ if(len >= sizeof(line)) {
+ logger(NULL, MESHLINK_ERROR, "Maximum line length exceeded!\n");
+ return NULL;
+ }
+
+ if(len && !isprint(**data)) {
+ abort();
+ }
+
+ memcpy(line, *data, len);
+ line[len] = 0;
+
+ if(end) {
+ *data = end + 1;
+ } else {
+ *data = NULL;
+ }
+
+ return line;
+}
+
+static char *get_value(const char *data, const char *var) {
+ char *line = get_line(&data);
+
+ if(!line) {
+ return NULL;
+ }
+
+ char *sep = line + strcspn(line, " \t=");
+ char *val = sep + strspn(sep, " \t");
+
+ if(*val == '=') {
+ val += 1 + strspn(val + 1, " \t");
+ }
+
+ *sep = 0;
+
+ if(strcasecmp(line, var)) {
+ return NULL;
+ }
+
+ return val;
+}
+
+static bool try_bind(int port) {
+ struct addrinfo *ai = NULL;
+ struct addrinfo hint = {
+ .ai_flags = AI_PASSIVE,
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = SOCK_STREAM,
+ .ai_protocol = IPPROTO_TCP,
+ };
+
+ char portstr[16];
+ snprintf(portstr, sizeof(portstr), "%d", port);
+
+ if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai) {
+ return false;
+ }
+
+ while(ai) {
+ int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
+
+ if(!fd) {
+ freeaddrinfo(ai);
+ return false;
+ }
+
+ int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
+ closesocket(fd);
+
+ if(result) {
+ freeaddrinfo(ai);
+ return false;
+ }
+
+ ai = ai->ai_next;
+ }
+
+ freeaddrinfo(ai);
+ return true;
+}
+
+int check_port(meshlink_handle_t *mesh) {
+ for(int i = 0; i < 1000; i++) {
+ int port = 0x1000 + (rand() & 0x7fff);
+
+ if(try_bind(port)) {
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ FILE *f = fopen(filename, "a");
+
+ if(!f) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ logger(mesh, MESHLINK_DEBUG, "Could not store Port.\n");
+ return 0;
+ }
+
+ fprintf(f, "Port = %d\n", port);
+ fclose(f);
+ return port;
+ }
+ }
+
+ meshlink_errno = MESHLINK_ENETWORK;
+ logger(mesh, MESHLINK_DEBUG, "Could not find any available network port.\n");
+ return 0;
+}
+
+static void deltree(const char *dirname) {
+ DIR *d = opendir(dirname);
+
+ if(d) {
+ struct dirent *ent;
+
+ while((ent = readdir(d))) {
+ if(ent->d_name[0] == '.') {
+ continue;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
+
+ if(unlink(filename)) {
+ deltree(filename);
+ }
+ }
+
+ closedir(d);
+ }
+
+ rmdir(dirname);
+}
+
+static bool finalize_join(meshlink_handle_t *mesh) {
+ char *name = xstrdup(get_value(mesh->data, "Name"));
+
+ if(!name) {
+ logger(mesh, MESHLINK_DEBUG, "No Name found in invitation!\n");
+ return false;
+ }
+
+ if(!check_id(name)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation: %s!\n", name);
+ return false;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
+
+ FILE *f = fopen(filename, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ fprintf(f, "Name = %s\n", name);
+
+ // Wipe all old host config files and invitations
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
+ deltree(filename);
+
+ if(mkdir(filename, 0777) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
+ deltree(filename);
+
+ // Create a new host config file for ourself
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+ FILE *fh = fopen(filename, "w");
+
+ if(!fh) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
+ fclose(f);
+ return false;
+ }
+
+ // Filter first chunk on approved keywords, split between meshlink.conf and hosts/Name
+ // Other chunks go unfiltered to their respective host config files
+ const char *p = mesh->data;
+ char *l, *value;
+
+ while((l = get_line(&p))) {
+ // Ignore comments
+ if(*l == '#') {
+ continue;
+ }
+
+ // Split line into variable and value
+ int len = strcspn(l, "\t =");
+ value = l + len;
+ value += strspn(value, "\t ");
+
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+
+ l[len] = 0;
+
+ // Is it a Name?
+ if(!strcasecmp(l, "Name"))
+ if(strcmp(value, name)) {
+ break;
+ } else {
+ continue;
+ } else if(!strcasecmp(l, "NetName")) {
+ continue;
+ }
+
+ // Check the list of known variables
+ bool found = false;
+ int i;
+
+ for(i = 0; variables[i].name; i++) {
+ if(strcasecmp(l, variables[i].name)) {
+ continue;
+ }
+
+ found = true;
+ break;
+ }
+
+ // Ignore unknown and unsafe variables
+ if(!found) {
+ logger(mesh, MESHLINK_DEBUG, "Ignoring unknown variable '%s' in invitation.\n", l);
+ continue;
+ } else if(!(variables[i].type & VAR_SAFE)) {
+ logger(mesh, MESHLINK_DEBUG, "Ignoring unsafe variable '%s' in invitation.\n", l);
+ continue;
+ }
+
+ // Copy the safe variable to the right config file
+ fprintf(variables[i].type & VAR_HOST ? fh : f, "%s = %s\n", l, value);
+ }
+
+ fclose(f);
+
+ while(l && !strcasecmp(l, "Name")) {
+ if(!check_id(value)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid Name found in invitation.\n");
+ return false;
+ }
+
+ if(!strcmp(value, name)) {
+ logger(mesh, MESHLINK_DEBUG, "Secondary chunk would overwrite our own host config file.\n");
+ return false;
+ }
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, value);
+ f = fopen(filename, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
+ return false;
+ }
+
+ while((l = get_line(&p))) {
+ if(!strcmp(l, "#---------------------------------------------------------------#")) {
+ continue;
+ }
+
+ int len = strcspn(l, "\t =");
+
+ if(len == 4 && !strncasecmp(l, "Name", 4)) {
+ value = l + len;
+ value += strspn(value, "\t ");
+
+ if(*value == '=') {
+ value++;
+ value += strspn(value, "\t ");
+ }
+
+ l[len] = 0;
+ break;
+ }
+
+ fputs(l, f);
+ fputc('\n', f);
+ }
+
+ fclose(f);
+ }
+
+ char *b64key = ecdsa_get_base64_public_key(mesh->self->connection->ecdsa);
+
+ if(!b64key) {
+ fclose(fh);
+ return false;
+ }
+
+ fprintf(fh, "ECDSAPublicKey = %s\n", b64key);
+ fprintf(fh, "Port = %s\n", mesh->myport);
+
+ fclose(fh);
+
+ sptps_send_record(&(mesh->sptps), 1, b64key, strlen(b64key));
+ free(b64key);
+
+ free(mesh->name);
+ free(mesh->self->name);
+ free(mesh->self->connection->name);
+ mesh->name = xstrdup(name);
+ mesh->self->name = xstrdup(name);
+ mesh->self->connection->name = name;
+
+ logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
+
+ load_all_nodes(mesh);
+
+ return true;
+}
+
+static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
+ (void)type;
+ meshlink_handle_t *mesh = handle;
+ const char *ptr = data;
+
+ while(len) {
+ int result = send(mesh->sock, ptr, len, 0);
+
+ if(result == -1 && errno == EINTR) {
+ continue;
+ } else if(result <= 0) {
+ return false;
+ }
+
+ ptr += result;
+ len -= result;
+ }
+
+ return true;
+}
+
+static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
+ meshlink_handle_t *mesh = handle;
+
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&(mesh->sptps), 0, mesh->cookie, sizeof(mesh)->cookie);
+
+ case 0:
+ mesh->data = xrealloc(mesh->data, mesh->thedatalen + len + 1);
+ memcpy(mesh->data + mesh->thedatalen, msg, len);
+ mesh->thedatalen += len;
+ mesh->data[mesh->thedatalen] = 0;
+ break;
+
+ case 1:
+ mesh->thedatalen = 0;
+ return finalize_join(mesh);
+
+ case 2:
+ logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
+ shutdown(mesh->sock, SHUT_RDWR);
+ mesh->success = true;
+ break;
+
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static bool recvline(meshlink_handle_t *mesh, size_t len) {
+ char *newline = NULL;
+
+ if(!mesh->sock) {
+ abort();
+ }
+
+ while(!(newline = memchr(mesh->buffer, '\n', mesh->blen))) {
+ int result = recv(mesh->sock, mesh->buffer + mesh->blen, sizeof(mesh)->buffer - mesh->blen, 0);
+
+ if(result == -1 && errno == EINTR) {
+ continue;
+ } else if(result <= 0) {
+ return false;
+ }
+
+ mesh->blen += result;
+ }
+
+ if((size_t)(newline - mesh->buffer) >= len) {
+ return false;
+ }
+
+ len = newline - mesh->buffer;
+
+ memcpy(mesh->line, mesh->buffer, len);
+ mesh->line[len] = 0;
+ memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
+ mesh->blen -= len + 1;
+
+ return true;
+}
+static bool sendline(int fd, char *format, ...) {
+ static char buffer[4096];
+ char *p = buffer;
+ int blen = 0;
+ va_list ap;
+
+ va_start(ap, format);
+ blen = vsnprintf(buffer, sizeof(buffer), format, ap);
+ va_end(ap);
+
+ if(blen < 1 || (size_t)blen >= sizeof(buffer)) {
+ return false;
+ }
+
+ buffer[blen] = '\n';
+ blen++;
+
+ while(blen) {
+ int result = send(fd, p, blen, MSG_NOSIGNAL);
+
+ if(result == -1 && errno == EINTR) {
+ continue;
+ } else if(result <= 0) {
+ return false;
+ }
+
+ p += result;
+ blen -= result;
+ }
+
+ return true;
+}
+
+static const char *errstr[] = {
+ [MESHLINK_OK] = "No error",
+ [MESHLINK_EINVAL] = "Invalid argument",
+ [MESHLINK_ENOMEM] = "Out of memory",
+ [MESHLINK_ENOENT] = "No such node",
+ [MESHLINK_EEXIST] = "Node already exists",
+ [MESHLINK_EINTERNAL] = "Internal error",
+ [MESHLINK_ERESOLV] = "Could not resolve hostname",
+ [MESHLINK_ESTORAGE] = "Storage error",
+ [MESHLINK_ENETWORK] = "Network error",
+ [MESHLINK_EPEER] = "Error communicating with peer",
+};
+
+const char *meshlink_strerror(meshlink_errno_t err) {
+ if((int)err < 0 || err >= sizeof(errstr) / sizeof(*errstr)) {
+ return "Invalid error code";
+ }
+
+ return errstr[err];
+}
+
+static bool ecdsa_keygen(meshlink_handle_t *mesh) {
+ ecdsa_t *key;
+ FILE *f;
+ char pubname[PATH_MAX], privname[PATH_MAX];
+
+ logger(mesh, MESHLINK_DEBUG, "Generating ECDSA keypair:\n");
+
+ if(!(key = ecdsa_generate())) {
+ logger(mesh, MESHLINK_DEBUG, "Error during key generation!\n");
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Done.\n");
+ }
+
+ if(snprintf(privname, sizeof(privname), "%s" SLASH "ecdsa_key.priv", mesh->confbase) >= PATH_MAX) {
+ logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "ecdsa_key.priv\n", mesh->confbase);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ f = fopen(privname, "wb");
+
+ if(!f) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+#ifdef HAVE_FCHMOD
+ fchmod(fileno(f), 0600);
+#endif
+
+ if(!ecdsa_write_pem_private_key(key, f)) {
+ logger(mesh, MESHLINK_DEBUG, "Error writing private key!\n");
+ ecdsa_free(key);
+ fclose(f);
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return false;
+ }
+
+ fclose(f);
+
+ snprintf(pubname, sizeof(pubname), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->name);
+ f = fopen(pubname, "a");
+
+ if(!f) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ char *pubkey = ecdsa_get_base64_public_key(key);
+ fprintf(f, "ECDSAPublicKey = %s\n", pubkey);
+ free(pubkey);
+
+ fclose(f);
+ ecdsa_free(key);
+
+ return true;
+}
+
+static struct timeval idle(event_loop_t *loop, void *data) {
+ (void)loop;
+ meshlink_handle_t *mesh = data;
+ struct timeval t, tmin = {3600, 0};
+
+ for splay_each(node_t, n, mesh->nodes) {
+ if(!n->utcp) {
+ continue;
+ }
+
+ t = utcp_timeout(n->utcp);
+
+ if(timercmp(&t, &tmin, <)) {
+ tmin = t;
+ }
+ }
+
+ return tmin;
+}
+
+// Get our local address(es) by simulating connecting to an Internet host.
+static void add_local_addresses(meshlink_handle_t *mesh) {
+ char host[NI_MAXHOST];
+ char entry[MAX_STRING_SIZE];
+
+ // IPv4 example.org
+
+ if(getlocaladdrname("93.184.216.34", host, sizeof(host))) {
+ snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
+ append_config_file(mesh, mesh->name, "Address", entry);
+ }
+
+ // IPv6 example.org
+
+ if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof(host))) {
+ snprintf(entry, sizeof(entry), "%s %s", host, mesh->myport);
+ append_config_file(mesh, mesh->name, "Address", entry);
+ }
+}
+
+static bool meshlink_setup(meshlink_handle_t *mesh) {
+ if(mkdir(mesh->confbase, 0777) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts", mesh->confbase);
+
+ if(mkdir(filename, 0777) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
+
+ if(!access(filename, F_OK)) {
+ logger(mesh, MESHLINK_DEBUG, "Configuration file %s already exists!\n", filename);
+ meshlink_errno = MESHLINK_EEXIST;
+ return false;
+ }
+
+ FILE *f = fopen(filename, "w");
+
+ if(!f) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create file %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+
+ fprintf(f, "Name = %s\n", mesh->name);
+ fclose(f);
+
+ if(!ecdsa_keygen(mesh)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ unlink(filename);
+ return false;
+ }
+
+ if(check_port(mesh) == 0) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ unlink(filename);
+ return false;
+ }
+
+ return true;
+}
+
+meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const char *appname, dev_class_t devclass) {
+ // Validate arguments provided by the application
+ bool usingname = false;
+
+ logger(NULL, MESHLINK_DEBUG, "meshlink_open called\n");
+
+ if(!confbase || !*confbase) {
+ logger(NULL, MESHLINK_ERROR, "No confbase given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ if(!appname || !*appname) {
+ logger(NULL, MESHLINK_ERROR, "No appname given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ if(strchr(appname, ' ')) {
+ logger(NULL, MESHLINK_ERROR, "Invalid appname given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ if(!name || !*name) {
+ logger(NULL, MESHLINK_ERROR, "No name given!\n");
+ //return NULL;
+ } else { //check name only if there is a name != NULL
+
+ if(!check_id(name)) {
+ logger(NULL, MESHLINK_ERROR, "Invalid name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ } else {
+ usingname = true;
+ }
+ }
+
+ if((int)devclass < 0 || devclass > _DEV_CLASS_MAX) {
+ logger(NULL, MESHLINK_ERROR, "Invalid devclass given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ meshlink_handle_t *mesh = xzalloc(sizeof(meshlink_handle_t));
+ mesh->confbase = xstrdup(confbase);
+ mesh->appname = xstrdup(appname);
+ mesh->devclass = devclass;
+ mesh->discovery = true;
+ mesh->invitation_timeout = 604800; // 1 week
+
+ if(usingname) {
+ mesh->name = xstrdup(name);
+ }
+
+ // initialize mutex
+ pthread_mutexattr_t attr;
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutex_init(&(mesh->mesh_mutex), &attr);
+
+ mesh->threadstarted = false;
+ event_loop_init(&mesh->loop);
+ mesh->loop.data = mesh;
+
+ meshlink_queue_init(&mesh->outpacketqueue);
+
+ // Check whether meshlink.conf already exists
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
+
+ if(access(filename, R_OK)) {
+ if(errno == ENOENT) {
+ // If not, create it
+ if(!meshlink_setup(mesh)) {
+ // meshlink_errno is set by meshlink_setup()
+ return NULL;
+ }
+ } else {
+ logger(NULL, MESHLINK_ERROR, "Cannot not read from %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+ }
+
+ // Read the configuration
+
+ init_configuration(&mesh->config);
+
+ if(!read_server_config(mesh)) {
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ };
+
+#ifdef HAVE_MINGW
+ struct WSAData wsa_state;
+
+ WSAStartup(MAKEWORD(2, 2), &wsa_state);
+
+#endif
+
+ // Setup up everything
+ // TODO: we should not open listening sockets yet
+
+ if(!setup_network(mesh)) {
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ENETWORK;
+ return NULL;
+ }
+
+ add_local_addresses(mesh);
+
+ idle_set(&mesh->loop, idle, mesh);
+
+ logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
+ return mesh;
+}
+
+static void *meshlink_main_loop(void *arg) {
+ meshlink_handle_t *mesh = arg;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ try_outgoing_connections(mesh);
+
+ logger(mesh, MESHLINK_DEBUG, "Starting main_loop...\n");
+ main_loop(mesh);
+ logger(mesh, MESHLINK_DEBUG, "main_loop returned.\n");
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+}
+
+bool meshlink_start(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ logger(mesh, MESHLINK_DEBUG, "meshlink_start called\n");
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ if(mesh->threadstarted) {
+ logger(mesh, MESHLINK_DEBUG, "thread was already running\n");
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return true;
+ }
+
+ if(mesh->listen_socket[0].tcp.fd < 0) {
+ logger(mesh, MESHLINK_ERROR, "Listening socket not open\n");
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ mesh->thedatalen = 0;
+
+ // TODO: open listening sockets first
+
+ //Check that a valid name is set
+ if(!mesh->name) {
+ logger(mesh, MESHLINK_DEBUG, "No name given!\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ // Start the main thread
+
+ event_loop_start(&mesh->loop);
+
+ if(pthread_create(&mesh->thread, NULL, meshlink_main_loop, mesh) != 0) {
+ logger(mesh, MESHLINK_DEBUG, "Could not start thread: %s\n", strerror(errno));
+ memset(&mesh->thread, 0, sizeof(mesh)->thread);
+ meshlink_errno = MESHLINK_EINTERNAL;
+ event_loop_stop(&mesh->loop);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ mesh->threadstarted = true;
+
+ if(mesh->discovery) {
+ discovery_start(mesh);
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return true;
+}
+
+void meshlink_stop(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
+
+ // Stop discovery
+ if(mesh->discovery) {
+ discovery_stop(mesh);
+ }
+
+ // Shut down the main thread
+ event_loop_stop(&mesh->loop);
+
+ // Send ourselves a UDP packet to kick the event loop
+ for(int i = 0; i < mesh->listen_sockets; i++) {
+ sockaddr_t sa;
+ socklen_t salen = sizeof(sa.sa);
+
+ if(getsockname(mesh->listen_socket[i].udp.fd, &sa.sa, &salen) == -1) {
+ logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getsockname", sockstrerror(sockerrno));
+ continue;
+ }
+
+ if(sendto(mesh->listen_socket[i].udp.fd, "", 1, MSG_NOSIGNAL, &sa.sa, salen) == -1) {
+ logger(mesh, MESHLINK_ERROR, "Could not send a UDP packet to ourself: %s", sockstrerror(sockerrno));
+ }
+ }
+
+ if(mesh->threadstarted) {
+ // Wait for the main thread to finish
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ pthread_join(mesh->thread, NULL);
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ mesh->threadstarted = false;
+ }
+
+ // Close all metaconnections
+ if(mesh->connections) {
+ for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
+ next = node->next;
+ connection_t *c = node->data;
+ c->outgoing = NULL;
+ terminate_connection(mesh, c, false);
+ }
+ }
+
+ if(mesh->outgoings) {
+ list_delete_list(mesh->outgoings);
+ mesh->outgoings = NULL;
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
+void meshlink_close(meshlink_handle_t *mesh) {
+ if(!mesh || !mesh->confbase) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ // stop can be called even if mesh has not been started
+ meshlink_stop(mesh);
+
+ // lock is not released after this
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ // Close and free all resources used.
+
+ close_network_connections(mesh);
+
+ logger(mesh, MESHLINK_INFO, "Terminating");
+
+ exit_configuration(&mesh->config);
+ event_loop_exit(&mesh->loop);
+
+#ifdef HAVE_MINGW
+
+ if(mesh->confbase) {
+ WSACleanup();
+ }
+
+#endif
+
+ ecdsa_free(mesh->invitation_key);
+
+ free(mesh->name);
+ free(mesh->appname);
+ free(mesh->confbase);
+ pthread_mutex_destroy(&(mesh->mesh_mutex));
+
+ memset(mesh, 0, sizeof(*mesh));
+
+ free(mesh);
+}
+
+bool meshlink_destroy(const char *confbase) {
+ if(!confbase) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", confbase);
+
+ if(unlink(filename)) {
+ if(errno == ENOENT) {
+ meshlink_errno = MESHLINK_ENOENT;
+ return false;
+ } else {
+ logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return false;
+ }
+ }
+
+ deltree(confbase);
+
+ return true;
+}
+
+void meshlink_set_receive_cb(meshlink_handle_t *mesh, meshlink_receive_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->receive_cb = cb;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
+void meshlink_set_node_status_cb(meshlink_handle_t *mesh, meshlink_node_status_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->node_status_cb = cb;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
+void meshlink_set_log_cb(meshlink_handle_t *mesh, meshlink_log_level_t level, meshlink_log_cb_t cb) {
+ if(mesh) {
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->log_cb = cb;
+ mesh->log_level = cb ? level : 0;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ } else {
+ global_log_cb = cb;
+ global_log_level = cb ? level : 0;
+ }
+}
+
+bool meshlink_send(meshlink_handle_t *mesh, meshlink_node_t *destination, const void *data, size_t len) {
+ meshlink_packethdr_t *hdr;
+
+ // Validate arguments
+ if(!mesh || !destination || len >= MAXSIZE - sizeof(*hdr)) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!len) {
+ return true;
+ }
+
+ if(!data) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ // Prepare the packet
+ vpn_packet_t *packet = malloc(sizeof(*packet));
+
+ if(!packet) {
+ meshlink_errno = MESHLINK_ENOMEM;
+ return false;
+ }
+
+ packet->probe = false;
+ packet->tcp = false;
+ packet->len = len + sizeof(*hdr);
+
+ hdr = (meshlink_packethdr_t *)packet->data;
+ memset(hdr, 0, sizeof(*hdr));
+ // leave the last byte as 0 to make sure strings are always
+ // null-terminated if they are longer than the buffer
+ strncpy((char *)hdr->destination, destination->name, (sizeof(hdr)->destination) - 1);
+ strncpy((char *)hdr->source, mesh->self->name, (sizeof(hdr)->source) - 1);
+
+ memcpy(packet->data + sizeof(*hdr), data, len);
+
+ // Queue it
+ if(!meshlink_queue_push(&mesh->outpacketqueue, packet)) {
+ free(packet);
+ meshlink_errno = MESHLINK_ENOMEM;
+ return false;
+ }
+
+ // Notify event loop
+ signal_trigger(&(mesh->loop), &(mesh->datafromapp));
+
+ return true;
+}
+
+void meshlink_send_from_queue(event_loop_t *loop, meshlink_handle_t *mesh) {
+ (void)loop;
+ vpn_packet_t *packet = meshlink_queue_pop(&mesh->outpacketqueue);
+
+ if(!packet) {
+ return;
+ }
+
+ mesh->self->in_packets++;
+ mesh->self->in_bytes += packet->len;
+ route(mesh, mesh->self, packet);
+}
+
+ssize_t meshlink_get_pmtu(meshlink_handle_t *mesh, meshlink_node_t *destination) {
+ if(!mesh || !destination) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ node_t *n = (node_t *)destination;
+
+ if(!n->status.reachable) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return 0;
+
+ } else if(n->mtuprobes > 30 && n->minmtu) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return n->minmtu;
+ } else {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return MTU;
+ }
+}
+
+char *meshlink_get_fingerprint(meshlink_handle_t *mesh, meshlink_node_t *node) {
+ if(!mesh || !node) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ node_t *n = (node_t *)node;
+
+ if(!node_read_ecdsa_public_key(mesh, n) || !n->ecdsa) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ char *fingerprint = ecdsa_get_base64_public_key(n->ecdsa);
+
+ if(!fingerprint) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return fingerprint;
+}
+
+meshlink_node_t *meshlink_get_self(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ return (meshlink_node_t *)mesh->self;
+}
+
+meshlink_node_t *meshlink_get_node(meshlink_handle_t *mesh, const char *name) {
+ if(!mesh || !name) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ meshlink_node_t *node = NULL;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ node = (meshlink_node_t *)lookup_node(mesh, (char *)name); // TODO: make lookup_node() use const
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return node;
+}
+
+meshlink_node_t **meshlink_get_all_nodes(meshlink_handle_t *mesh, meshlink_node_t **nodes, size_t *nmemb) {
+ if(!mesh || !nmemb || (*nmemb && !nodes)) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ meshlink_node_t **result;
+
+ //lock mesh->nodes
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ *nmemb = mesh->nodes->count;
+ result = realloc(nodes, *nmemb * sizeof(*nodes));
+
+ if(result) {
+ meshlink_node_t **p = result;
+
+ for splay_each(node_t, n, mesh->nodes) {
+ *p++ = (meshlink_node_t *)n;
+ }
+ } else {
+ *nmemb = 0;
+ free(nodes);
+ meshlink_errno = MESHLINK_ENOMEM;
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ return result;
+}
+
+bool meshlink_sign(meshlink_handle_t *mesh, const void *data, size_t len, void *signature, size_t *siglen) {
+ if(!mesh || !data || !len || !signature || !siglen) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(*siglen < MESHLINK_SIGLEN) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ if(!ecdsa_sign(mesh->self->connection->ecdsa, data, len, signature)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ *siglen = MESHLINK_SIGLEN;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return true;
+}
+
+bool meshlink_verify(meshlink_handle_t *mesh, meshlink_node_t *source, const void *data, size_t len, const void *signature, size_t siglen) {
+ if(!mesh || !data || !len || !signature) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(siglen != MESHLINK_SIGLEN) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ bool rval = false;
+
+ struct node_t *n = (struct node_t *)source;
+ node_read_ecdsa_public_key(mesh, n);
+
+ if(!n->ecdsa) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ rval = false;
+ } else {
+ rval = ecdsa_verify(((struct node_t *)source)->ecdsa, data, len, signature);
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return rval;
+}
+
+static bool refresh_invitation_key(meshlink_handle_t *mesh) {
+ char filename[PATH_MAX];
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations", mesh->confbase);
+
+ if(mkdir(filename, 0700) && errno != EEXIST) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ // Count the number of valid invitations, clean up old ones
+ DIR *dir = opendir(filename);
+
+ if(!dir) {
+ logger(mesh, MESHLINK_DEBUG, "Could not read directory %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ errno = 0;
+ int count = 0;
+ struct dirent *ent;
+ time_t deadline = time(NULL) - 604800; // 1 week in the past
+
+ while((ent = readdir(dir))) {
+ if(strlen(ent->d_name) != 24) {
+ continue;
+ }
+
+ char invname[PATH_MAX];
+ struct stat st;
+
+ if(snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= PATH_MAX) {
+ logger(mesh, MESHLINK_DEBUG, "Filename too long: %s" SLASH "%s", filename, ent->d_name);
+ continue;
+ }
+
+ if(!stat(invname, &st)) {
+ if(mesh->invitation_key && deadline < st.st_mtime) {
+ count++;
+ } else {
+ unlink(invname);
+ }
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Could not stat %s: %s\n", invname, strerror(errno));
+ errno = 0;
+ }
+ }
+
+ if(errno) {
+ logger(mesh, MESHLINK_DEBUG, "Error while reading directory %s: %s\n", filename, strerror(errno));
+ closedir(dir);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ closedir(dir);
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
+
+ // Remove the key if there are no outstanding invitations.
+ if(!count) {
+ unlink(filename);
+
+ if(mesh->invitation_key) {
+ ecdsa_free(mesh->invitation_key);
+ mesh->invitation_key = NULL;
+ }
+ }
+
+ if(mesh->invitation_key) {
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return true;
+ }
+
+ // Create a new key if necessary.
+ FILE *f = fopen(filename, "rb");
+
+ if(!f) {
+ if(errno != ENOENT) {
+ logger(mesh, MESHLINK_DEBUG, "Could not read %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ mesh->invitation_key = ecdsa_generate();
+
+ if(!mesh->invitation_key) {
+ logger(mesh, MESHLINK_DEBUG, "Could not generate a new key!\n");
+ meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ f = fopen(filename, "wb");
+
+ if(!f) {
+ logger(mesh, MESHLINK_DEBUG, "Could not write %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ chmod(filename, 0600);
+ ecdsa_write_pem_private_key(mesh->invitation_key, f);
+ fclose(f);
+ } else {
+ mesh->invitation_key = ecdsa_read_pem_private_key(f);
+ fclose(f);
+
+ if(!mesh->invitation_key) {
+ logger(mesh, MESHLINK_DEBUG, "Could not read private key from %s\n", filename);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ }
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return mesh->invitation_key;
+}
+
+bool meshlink_set_canonical_address(meshlink_handle_t *mesh, meshlink_node_t *node, const char *address, const char *port) {
+ if(!mesh || !node || !address) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(!is_valid_hostname(address)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in address: %s\n", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(port && !is_valid_port(port)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid character in port: %s\n", address);
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char *canonical_address;
+
+ if(port) {
+ xasprintf(&canonical_address, "%s %s", address, port);
+ } else {
+ canonical_address = xstrdup(address);
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ bool rval = modify_config_file(mesh, node->name, "CanonicalAddress", canonical_address, 1);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ free(canonical_address);
+ return rval;
+}
+
+bool meshlink_add_address(meshlink_handle_t *mesh, const char *address) {
+ return meshlink_set_canonical_address(mesh, (meshlink_node_t *)mesh->self, address, NULL);
+}
+
+bool meshlink_add_external_address(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ char *address = meshlink_get_external_address(mesh);
+
+ if(!address) {
+ return false;
+ }
+
+ bool rval = false;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ rval = append_config_file(mesh, mesh->self->name, "Address", address);
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ free(address);
+ return rval;
+}
+
+int meshlink_get_port(meshlink_handle_t *mesh) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return -1;
+ }
+
+ if(!mesh->myport) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ return -1;
+ }
+
+ return atoi(mesh->myport);
+}
+
+bool meshlink_set_port(meshlink_handle_t *mesh, int port) {
+ if(!mesh || port < 0 || port >= 65536 || mesh->threadstarted) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ if(mesh->myport && port == atoi(mesh->myport)) {
+ return true;
+ }
+
+ if(!try_bind(port)) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ return false;
+ }
+
+ bool rval = false;
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ if(mesh->threadstarted) {
+ meshlink_errno = MESHLINK_EINVAL;
+ goto done;
+ }
+
+ close_network_connections(mesh);
+ exit_configuration(&mesh->config);
+
+ char portstr[10];
+ snprintf(portstr, sizeof(portstr), "%d", port);
+ portstr[sizeof(portstr) - 1] = 0;
+
+ modify_config_file(mesh, mesh->name, "Port", portstr, true);
+
+ init_configuration(&mesh->config);
+
+ if(!read_server_config(mesh)) {
+ meshlink_errno = MESHLINK_ESTORAGE;
+ } else if(!setup_network(mesh)) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ } else {
+ rval = true;
+ }
+
+done:
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+
+ return rval;
+}
+
+void meshlink_set_invitation_timeout(meshlink_handle_t *mesh, int timeout) {
+ mesh->invitation_timeout = timeout;
+}
+
+char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return NULL;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ // Check validity of the new node's name
+ if(!check_id(name)) {
+ logger(mesh, MESHLINK_DEBUG, "Invalid name for node.\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ // Ensure no host configuration file with that name exists
+ char filename[PATH_MAX];
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+
+ if(!access(filename, F_OK)) {
+ logger(mesh, MESHLINK_DEBUG, "A host config file for %s already exists!\n", name);
+ meshlink_errno = MESHLINK_EEXIST;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ // Ensure no other nodes know about this name
+ if(meshlink_get_node(mesh, name)) {
+ logger(mesh, MESHLINK_DEBUG, "A node with name %s is already known!\n", name);
+ meshlink_errno = MESHLINK_EEXIST;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ // Get the local address
+ char *address = get_my_hostname(mesh);
+
+ if(!address) {
+ logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
+ meshlink_errno = MESHLINK_ERESOLV;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ if(!refresh_invitation_key(mesh)) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ char hash[64];
+
+ // Create a hash of the key.
+ char *fingerprint = ecdsa_get_base64_public_key(mesh->invitation_key);
+ sha512(fingerprint, strlen(fingerprint), hash);
+ b64encode_urlsafe(hash, hash, 18);
+
+ // Create a random cookie for this invitation.
+ char cookie[25];
+ randomize(cookie, 18);
+
+ // Create a filename that doesn't reveal the cookie itself
+ char buf[18 + strlen(fingerprint)];
+ char cookiehash[64];
+ memcpy(buf, cookie, 18);
+ memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
+ sha512(buf, sizeof(buf), cookiehash);
+ b64encode_urlsafe(cookiehash, cookiehash, 18);
+
+ b64encode_urlsafe(cookie, cookie, 18);
+
+ free(fingerprint);
+
+ // Create a file containing the details of the invitation.
+ snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", mesh->confbase, cookiehash);
+ int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
+
+ if(!ifd) {
+ logger(mesh, MESHLINK_DEBUG, "Could not create invitation file %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ FILE *f = fdopen(ifd, "w");
+
+ if(!f) {
+ abort();
+ }
+
+ // Fill in the details.
+ fprintf(f, "Name = %s\n", name);
+ fprintf(f, "ConnectTo = %s\n", mesh->self->name);
+
+ // Copy Broadcast and Mode
+ snprintf(filename, sizeof(filename), "%s" SLASH "meshlink.conf", mesh->confbase);
+ FILE *tc = fopen(filename, "r");
+
+ if(tc) {
+ char buf[1024];
+
+ while(fgets(buf, sizeof(buf), tc)) {
+ if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
+ || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
+ fputs(buf, f);
+
+ // Make sure there is a newline character.
+ if(!strchr(buf, '\n')) {
+ fputc('\n', f);
+ }
+ }
+ }
+
+ fclose(tc);
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Could not create %s: %s\n", filename, strerror(errno));
+ meshlink_errno = MESHLINK_ESTORAGE;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return NULL;
+ }
+
+ fprintf(f, "#---------------------------------------------------------------#\n");
+ fprintf(f, "Name = %s\n", mesh->self->name);
+
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ fcopy(f, filename);
+ fclose(f);
+
+ // Create an URL from the local address, key hash and cookie
+ char *url;
+ xasprintf(&url, "%s/%s%s", address, hash, cookie);
+ free(address);
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return url;
+}
+
+bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
+ if(!mesh || !invitation) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return false;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ //Before doing meshlink_join make sure we are not connected to another mesh
+ if(mesh->threadstarted) {
+ logger(mesh, MESHLINK_DEBUG, "Already connected to a mesh\n");
+ meshlink_errno = MESHLINK_EINVAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
+ char copy[strlen(invitation) + 1];
+ strcpy(copy, invitation);
+
+ // Split the invitation URL into hostname, port, key hash and cookie.
+
+ char *slash = strchr(copy, '/');
+
+ if(!slash) {
+ goto invalid;
+ }
+
+ *slash++ = 0;
+
+ if(strlen(slash) != 48) {
+ goto invalid;
+ }
+
+ char *address = copy;
+ char *port = strrchr(address, ':');
+
+ if(!port) {
+ goto invalid;
+ }
+
+ *port++ = 0;
+
+ if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
+ goto invalid;
+ }
+
+ // Generate a throw-away key for the invitation.
+ ecdsa_t *key = ecdsa_generate();
+
+ if(!key) {
+ meshlink_errno = MESHLINK_EINTERNAL;
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+ return false;
+ }
+
+ char *b64key = ecdsa_get_base64_public_key(key);
+ char *comma;
+ mesh->sock = -1;
+
+ while(address && *address) {
+ // We allow commas in the address part to support multiple addresses in one invitation URL.
+ comma = strchr(address, ',');
+
+ if(comma) {
+ *comma++ = 0;
+ }
+
+ // IPv6 address are enclosed in brackets, per RFC 3986
+ if(*address == '[') {
+ address++;
+ char *bracket = strchr(address, ']');
+
+ if(!bracket) {
+ goto invalid;
+ }
+
+ *bracket++ = 0;
+
+ if(comma && bracket != comma) {
+ goto invalid;
+ }
+ }