/*
meshlink.c -- Implementation of the MeshLink API.
- Copyright (C) 2014, 2017 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2018 Guus Sliepen <guus@meshlink.io>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
return len;
}
-static void scan_for_hostname(const char *filename, char **hostname, char **port) {
+static void scan_for_canonical_address(const char *filename, char **hostname, char **port) {
char line[4096];
- bool canonical = false;
if(!filename || (*hostname && *port)) {
return;
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);
}
}
- if(canonical && *hostname && *port) {
+ if(*hostname && *port) {
break;
}
}
}
if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
+ closesocket(sock);
freeaddrinfo(rai);
return false;
}
socklen_t sl = sizeof(sn);
if(getsockname(sock, (struct sockaddr *)&sn, &sl)) {
+ closesocket(sock);
return false;
}
+ closesocket(sock);
+
if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
return false;
}
hostname = NULL;
}
- // If there is no hostname, determine the address used for an outgoing connection.
if(!hostname) {
- char localaddr[NI_MAXHOST];
- bool success = false;
+ meshlink_errno = MESHLINK_ERESOLV;
+ }
- 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));
- }
+ return hostname;
+}
- if(success) {
- hostname = xstrdup(localaddr);
- }
+char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
+ (void)mesh;
+
+ // Determine address of the local interface used for outgoing connections.
+ 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(!hostname) {
- meshlink_errno = MESHLINK_ERESOLV;
+ if(!success) {
+ meshlink_errno = MESHLINK_ENETWORK;
+ return NULL;
}
- return hostname;
+ return xstrdup(localaddr);
+}
+
+void remove_duplicate_hostnames(char *host[], char *port[], int n) {
+ for(int i = 0; i < n; i++) {
+ if(!host[i]) {
+ continue;
+ }
+
+ // Ignore duplicate hostnames
+ bool found = false;
+
+ for(int j = 0; j < i; j++) {
+ if(!host[j]) {
+ continue;
+ }
+
+ if(strcmp(host[i], host[j])) {
+ continue;
+ }
+
+ if(strcmp(port[i], port[j])) {
+ continue;
+ }
+
+ found = true;
+ break;
+ }
+
+ if(found) {
+ free(host[i]);
+ free(port[i]);
+ host[i] = NULL;
+ port[i] = NULL;
+ continue;
+ }
+ }
}
// 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;
+static char *get_my_hostname(meshlink_handle_t *mesh, uint32_t flags) {
+ char *hostname[4] = {NULL};
+ char *port[4] = {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(!(flags & (MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC))) {
+ flags |= MESHLINK_INVITE_LOCAL | MESHLINK_INVITE_PUBLIC;
+ }
- if(hostname[0]) {
- goto done;
+ if(!(flags & (MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6))) {
+ flags |= MESHLINK_INVITE_IPV4 | MESHLINK_INVITE_IPV6;
}
- hostname[0] = meshlink_get_external_address_for_family(mesh, AF_INET);
- hostname[1] = meshlink_get_external_address_for_family(mesh, AF_INET6);
+ fprintf(stderr, "flags = %u\n", flags);
- if(!hostname[0] && !hostname[1]) {
- return NULL;
+ // Add local addresses if requested
+ if(flags & MESHLINK_INVITE_LOCAL) {
+ if(flags & MESHLINK_INVITE_IPV4) {
+ hostname[0] = meshlink_get_local_address_for_family(mesh, AF_INET);
+ }
+
+ if(flags & MESHLINK_INVITE_IPV6) {
+ hostname[1] = meshlink_get_local_address_for_family(mesh, AF_INET6);
+ }
+ }
+
+ // Add public/canonical addresses if requested
+ if(flags & MESHLINK_INVITE_PUBLIC) {
+ // Try the CanonicalAddress first
+ char filename[PATH_MAX] = "";
+ snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", mesh->confbase, mesh->self->name);
+ scan_for_canonical_address(filename, &hostname[2], &port[2]);
+
+ if(!hostname[2]) {
+ if(flags & MESHLINK_INVITE_IPV4) {
+ hostname[2] = meshlink_get_external_address_for_family(mesh, AF_INET);
+ }
+
+ if(flags & MESHLINK_INVITE_IPV6) {
+ hostname[3] = meshlink_get_external_address_for_family(mesh, AF_INET6);
+ }
+ }
}
- if(hostname[0] && hostname[1] && !strcmp(hostname[0], hostname[1])) {
- free(hostname[1]);
- hostname[1] = NULL;
+ for(int i = 0; i < 4; i++) {
+ // Ensure we always have a port number
+ if(hostname[i] && !port[i]) {
+ port[i] = xstrdup(mesh->myport);
+ }
}
- port = xstrdup(mesh->myport);
+ remove_duplicate_hostnames(hostname, port, 4);
+
+ if(!(flags & MESHLINK_INVITE_NUMERIC)) {
+ for(int i = 0; i < 4; i++) {
+ if(!hostname[i]) {
+ continue;
+ }
+
+ // Convert what we have to a sockaddr
+ struct addrinfo *ai_in, *ai_out;
+ struct addrinfo hint = {
+ .ai_family = AF_UNSPEC,
+ .ai_flags = AI_NUMERICSERV,
+ .ai_socktype = SOCK_STREAM,
+ };
+ int err = getaddrinfo(hostname[i], port[i], &hint, &ai_in);
- 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);
+ if(err || !ai_in) {
+ continue;
+ }
+
+ // Convert it to a hostname
+ char resolved_host[NI_MAXHOST];
+ char resolved_port[NI_MAXSERV];
+ err = getnameinfo(ai_in->ai_addr, ai_in->ai_addrlen, resolved_host, sizeof resolved_host, resolved_port, sizeof resolved_port, NI_NUMERICSERV);
+
+ if(err) {
+ freeaddrinfo(ai_in);
+ continue;
+ }
+
+ // Convert the hostname back to a sockaddr
+ hint.ai_family = ai_in->ai_family;
+ err = getaddrinfo(resolved_host, resolved_port, &hint, &ai_out);
+
+ if(err || !ai_out) {
+ freeaddrinfo(ai_in);
+ continue;
+ }
+
+ // Check if it's still the same sockaddr
+ if(ai_in->ai_addrlen != ai_out->ai_addrlen || memcmp(ai_in->ai_addr, ai_out->ai_addr, ai_in->ai_addrlen)) {
+ freeaddrinfo(ai_in);
+ freeaddrinfo(ai_out);
+ continue;
+ }
+
+ // Yes: replace the hostname with the resolved one
+ free(hostname[i]);
+ hostname[i] = xstrdup(resolved_host);
+
+ freeaddrinfo(ai_in);
+ freeaddrinfo(ai_out);
}
}
-done:
+ // Remove duplicates again, since IPv4 and IPv6 addresses might map to the same hostname
+ remove_duplicate_hostnames(hostname, port, 4);
- for(int i = 0; i < 2; i++) {
+ // Concatenate all unique address to the hostport string
+ for(int i = 0; i < 4; 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;
- }
+ // Ensure we have the same addresses in our own host config file.
+ char *tmphostport;
+ xasprintf(&tmphostport, "%s %s", hostname[i], port[i]);
+ append_config_file(mesh, mesh->self->name, "Address", tmphostport);
+ free(tmphostport);
- if(port) {
+ // Append the address to the hostport string
char *newhostport;
- xasprintf(&newhostport, "%s:%s", hostport, port);
- free(port);
+ xasprintf(&newhostport, (strchr(hostname[i], ':') ? "%s%s[%s]:%s" : "%s%s%s:%s"), hostport ? hostport : "", hostport ? "," : "", hostname[i], port[i]);
free(hostport);
hostport = newhostport;
+
+ free(hostname[i]);
+ free(port[i]);
}
return hostport;
[MESHLINK_ESTORAGE] = "Storage error",
[MESHLINK_ENETWORK] = "Network error",
[MESHLINK_EPEER] = "Error communicating with peer",
+ [MESHLINK_ENOTSUP] = "Operation not supported",
+ [MESHLINK_EBUSY] = "MeshLink instance already in use",
};
const char *meshlink_strerror(meshlink_errno_t err) {
}
}
+ // Open the configuration file and lock it
+
+ mesh->conffile = fopen(filename, "r");
+
+ if(!mesh->conffile) {
+ logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_ESTORAGE;
+ return NULL;
+ }
+
+#ifdef FD_CLOEXEC
+ fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC);
+#endif
+
+#ifdef HAVE_MINGW
+ // TODO: use _locking()?
+#else
+
+ if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) {
+ logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", filename, strerror(errno));
+ meshlink_close(mesh);
+ meshlink_errno = MESHLINK_EBUSY;
+ return NULL;
+ }
+
+#endif
+
// Read the configuration
init_configuration(&mesh->config);
mesh->threadstarted = true;
+#if HAVE_CATTA
+
if(mesh->discovery) {
discovery_start(mesh);
}
+#endif
+
pthread_mutex_unlock(&(mesh->mesh_mutex));
return true;
}
pthread_mutex_lock(&(mesh->mesh_mutex));
logger(mesh, MESHLINK_DEBUG, "meshlink_stop called\n");
+#if HAVE_CATTA
+
// Stop discovery
if(mesh->discovery) {
discovery_stop(mesh);
}
+#endif
+
// Shut down the main thread
event_loop_stop(&mesh->loop);
free(mesh->confbase);
pthread_mutex_destroy(&(mesh->mesh_mutex));
+ if(mesh->conffile) {
+ fclose(mesh->conffile);
+ }
+
memset(mesh, 0, sizeof(*mesh));
free(mesh);
pthread_mutex_unlock(&(mesh->mesh_mutex));
}
+void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb) {
+ if(!mesh) {
+ meshlink_errno = MESHLINK_EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+ mesh->node_duplicate_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->invitation_timeout = timeout;
}
-char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
+char *meshlink_invite_ex(meshlink_handle_t *mesh, const char *name, uint32_t flags) {
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return NULL;
}
// Get the local address
- char *address = get_my_hostname(mesh);
+ char *address = get_my_hostname(mesh, flags);
if(!address) {
logger(mesh, MESHLINK_DEBUG, "No Address known for ourselves!\n");
return url;
}
+char *meshlink_invite(meshlink_handle_t *mesh, const char *name) {
+ return meshlink_invite_ex(mesh, name, 0);
+}
+
bool meshlink_join(meshlink_handle_t *mesh, const char *invitation) {
if(!mesh || !invitation) {
meshlink_errno = MESHLINK_EINVAL;
char copy[strlen(invitation) + 1];
strcpy(copy, invitation);
- // Split the invitation URL into hostname, port, key hash and cookie.
+ // Split the invitation URL into a list of hostname/port tuples, a key hash and a cookie.
char *slash = strchr(copy, '/');
}
char *address = copy;
- char *port = strrchr(address, ':');
-
- if(!port) {
- goto invalid;
- }
-
- *port++ = 0;
+ char *port = NULL;
if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
goto invalid;
*comma++ = 0;
}
+ // Split of the port
+ port = strrchr(address, ':');
+
+ if(!port) {
+ goto invalid;
+ }
+
+ *port++ = 0;
+
// IPv6 address are enclosed in brackets, per RFC 3986
if(*address == '[') {
address++;
*bracket++ = 0;
- if(comma && bracket != comma) {
+ if(*bracket) {
goto invalid;
}
}
//Make blacklisting persistent in the config file
append_config_file(mesh, n->name, "blacklisted", "yes");
+ //Immediately terminate any connections we have with the blacklisted node
+ for list_each(connection_t, c, mesh->connections) {
+ if(c->node == n) {
+ terminate_connection(mesh, c, c->status.active);
+ }
+ }
+
pthread_mutex_unlock(&(mesh->mesh_mutex));
- return;
}
void meshlink_whitelist(meshlink_handle_t *mesh, meshlink_node_t *node) {
}
}
+void handle_duplicate_node(meshlink_handle_t *mesh, node_t *n) {
+ if(!mesh->node_duplicate_cb || n->status.duplicate) {
+ return;
+ }
+
+ n->status.duplicate = true;
+ mesh->node_duplicate_cb(mesh, (meshlink_node_t *)n);
+}
+
void meshlink_enable_discovery(meshlink_handle_t *mesh, bool enable) {
+#if HAVE_CATTA
+
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return;
end:
pthread_mutex_unlock(&mesh->mesh_mutex);
+#else
+ (void)mesh;
+ (void)enable;
+ meshlink_errno = MESHLINK_ENOTSUP;
+#endif
}
static void __attribute__((constructor)) meshlink_init(void) {
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