return hostname;
}
+static bool is_localaddr(sockaddr_t *sa) {
+ switch(sa->sa.sa_family) {
+ case AF_INET:
+ return *(uint8_t *)(&sa->in.sin_addr.s_addr) == 127;
+
+ case AF_INET6: {
+ uint16_t first = sa->in6.sin6_addr.s6_addr[0] << 8 | sa->in6.sin6_addr.s6_addr[1];
+ return first == 0 || (first & 0xffc0) == 0xfe80;
+ }
+
+ default:
+ return false;
+ }
+}
+
char *meshlink_get_local_address_for_family(meshlink_handle_t *mesh, int family) {
(void)mesh;
success = getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", localaddr, sizeof(localaddr), mesh->netns);
}
+#ifdef HAVE_GETIFADDRS
+
+ if(!success) {
+ struct ifaddrs *ifa = NULL;
+ getifaddrs(&ifa);
+
+ for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
+ sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
+
+ if(sa->sa.sa_family != family) {
+ continue;
+ }
+
+ if(is_localaddr(sa)) {
+ continue;
+ }
+
+ if(!getnameinfo(&sa->sa, SALEN(sa->sa), localaddr, sizeof(localaddr), NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV)) {
+ success = true;
+ break;
+ }
+ }
+
+ freeifaddrs(ifa);
+ }
+
+#endif
+
if(!success) {
meshlink_errno = MESHLINK_ENETWORK;
return NULL;
return false;
}
- //while(ai) {
+ bool success = false;
+
for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
- int fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
+ /* Try to bind to TCP. */
- if(!fd) {
- freeaddrinfo(ai);
- return false;
+ int tcp_fd = socket(aip->ai_family, SOCK_STREAM, IPPROTO_TCP);
+
+ if(tcp_fd == -1) {
+ continue;
}
- int result = bind(fd, aip->ai_addr, aip->ai_addrlen);
- closesocket(fd);
+ int result = bind(tcp_fd, aip->ai_addr, aip->ai_addrlen);
+ closesocket(tcp_fd);
if(result) {
- freeaddrinfo(ai);
- return false;
+ if(errno == EADDRINUSE) {
+ /* If this port is in use for any address family, avoid it. */
+ success = false;
+ break;
+ } else {
+ continue;
+ }
+ }
+
+ /* If TCP worked, then we require that UDP works as well. */
+
+ int udp_fd = socket(aip->ai_family, SOCK_DGRAM, IPPROTO_UDP);
+
+ if(udp_fd == -1) {
+ success = false;
+ break;
+ }
+
+ result = bind(udp_fd, aip->ai_addr, aip->ai_addrlen);
+ closesocket(udp_fd);
+
+ if(result) {
+ success = false;
+ break;
}
+
+ success = true;
}
freeaddrinfo(ai);
- return true;
+ return success;
}
static int check_port(meshlink_handle_t *mesh) {
return true;
}
-static bool finalize_join(meshlink_handle_t *mesh, const void *buf, uint16_t len) {
+typedef struct {
+ meshlink_handle_t *mesh;
+ int sock;
+ char cookie[18 + 32];
+ char hash[18];
+ bool success;
+ sptps_t sptps;
+ char *data;
+ size_t thedatalen;
+ size_t blen;
+ char line[4096];
+ char buffer[4096];
+} join_state_t;
+
+static bool finalize_join(join_state_t *state, const void *buf, uint16_t len) {
+ meshlink_handle_t *mesh = state->mesh;
packmsg_input_t in = {buf, len};
uint32_t version = packmsg_get_uint32(&in);
sockaddr_t sa;
socklen_t salen = sizeof(sa);
- if(getpeername(mesh->sock, &sa.sa, &salen) == 0) {
+ if(getpeername(state->sock, &sa.sa, &salen) == 0) {
node_add_recent_address(mesh, n, &sa);
}
}
+ /* Clear the reachability times, since we ourself have never seen these nodes yet */
+ n->last_reachable = 0;
+ n->last_unreachable = 0;
+
if(!node_write_config(mesh, n)) {
free_node(n);
return false;
return false;
}
- sptps_send_record(&mesh->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
+ if(!mesh->inviter_commits_first) {
+ devtool_set_inviter_commits_first(false);
+ }
+
+ sptps_send_record(&state->sptps, 1, ecdsa_get_public_key(mesh->private_key), 32);
logger(mesh, MESHLINK_DEBUG, "Configuration stored in: %s\n", mesh->confbase);
static bool invitation_send(void *handle, uint8_t type, const void *data, size_t len) {
(void)type;
- meshlink_handle_t *mesh = handle;
+ join_state_t *state = handle;
const char *ptr = data;
while(len) {
- int result = send(mesh->sock, ptr, len, 0);
+ int result = send(state->sock, ptr, len, 0);
if(result == -1 && errno == EINTR) {
continue;
}
static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
- meshlink_handle_t *mesh = handle;
+ join_state_t *state = handle;
+ meshlink_handle_t *mesh = state->mesh;
- switch(type) {
- case SPTPS_HANDSHAKE:
- return sptps_send_record(&mesh->sptps, 0, mesh->cookie, sizeof(mesh)->cookie);
+ if(mesh->inviter_commits_first) {
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&state->sptps, 2, state->cookie, 18 + 32);
- case 0:
- return finalize_join(mesh, msg, len);
+ case 1:
+ break;
- case 1:
- logger(mesh, MESHLINK_DEBUG, "Invitation succesfully accepted.\n");
- shutdown(mesh->sock, SHUT_RDWR);
- mesh->success = true;
- break;
+ case 0:
+ if(!finalize_join(state, msg, len)) {
+ return false;
+ }
- default:
- return false;
+ logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
+ shutdown(state->sock, SHUT_RDWR);
+ state->success = true;
+ break;
+
+ default:
+ return false;
+ }
+ } else {
+ switch(type) {
+ case SPTPS_HANDSHAKE:
+ return sptps_send_record(&state->sptps, 0, state->cookie, 18);
+
+ case 0:
+ return finalize_join(state, msg, len);
+
+ case 1:
+ logger(mesh, MESHLINK_DEBUG, "Invitation successfully accepted.\n");
+ shutdown(state->sock, SHUT_RDWR);
+ state->success = true;
+ break;
+
+ default:
+ return false;
+ }
}
return true;
}
-static bool recvline(meshlink_handle_t *mesh, size_t len) {
+static bool recvline(join_state_t *state) {
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);
+ while(!(newline = memchr(state->buffer, '\n', state->blen))) {
+ int result = recv(state->sock, state->buffer + state->blen, sizeof(state)->buffer - state->blen, 0);
if(result == -1 && errno == EINTR) {
continue;
return false;
}
- mesh->blen += result;
+ state->blen += result;
}
- if((size_t)(newline - mesh->buffer) >= len) {
+ if((size_t)(newline - state->buffer) >= sizeof(state->line)) {
return false;
}
- len = newline - mesh->buffer;
+ size_t len = newline - state->buffer;
- memcpy(mesh->line, mesh->buffer, len);
- mesh->line[len] = 0;
- memmove(mesh->buffer, newline + 1, mesh->blen - len - 1);
- mesh->blen -= len + 1;
+ memcpy(state->line, state->buffer, len);
+ state->line[len] = 0;
+ memmove(state->buffer, newline + 1, state->blen - len - 1);
+ state->blen -= len + 1;
return true;
}
}
bool meshlink_start(meshlink_handle_t *mesh) {
- assert(mesh->self);
- assert(mesh->private_key);
-
if(!mesh) {
meshlink_errno = MESHLINK_EINVAL;
return false;
pthread_mutex_lock(&mesh->mutex);
+ assert(mesh->self);
+ assert(mesh->private_key);
assert(mesh->self->ecdsa);
assert(!memcmp((uint8_t *)mesh->self->ecdsa + 64, (uint8_t *)mesh->private_key + 64, 32));
return false;
}
- mesh->thedatalen = 0;
-
// TODO: open listening sockets first
//Check that a valid name is set
bool reachable;
pthread_mutex_lock(&mesh->mutex);
- reachable = n->status.reachable;
+ reachable = n->status.reachable && !n->status.blacklisted;
if(last_reachable) {
*last_reachable = n->last_reachable;
}
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) {
+ if(!mesh || !source || !data || !len || !signature) {
meshlink_errno = MESHLINK_EINVAL;
return false;
}
}
// Ensure no other nodes know about this name
- if(meshlink_get_node(mesh, name)) {
+ if(lookup_node(mesh, name)) {
logger(mesh, MESHLINK_ERROR, "A node with name %s is already known!\n", name);
meshlink_errno = MESHLINK_EEXIST;
pthread_mutex_unlock(&mesh->mutex);
// If we changed our own host config file, write it out now
if(mesh->self->status.dirty) {
if(!node_write_config(mesh, mesh->self)) {
- logger(mesh, MESHLINK_ERROR, "Could not write our own host conifg file!\n");
+ logger(mesh, MESHLINK_ERROR, "Could not write our own host config file!\n");
pthread_mutex_unlock(&mesh->mutex);
return NULL;
}
return false;
}
+ join_state_t state = {
+ .mesh = mesh,
+ .sock = -1,
+ };
+
+ ecdsa_t *key = NULL;
+ ecdsa_t *hiskey = NULL;
+
+ //TODO: think of a better name for this variable, or of a different way to tokenize the invitation URL.
+ char copy[strlen(invitation) + 1];
+
pthread_mutex_lock(&mesh->mutex);
//Before doing meshlink_join make sure we are not connected to another mesh
if(mesh->threadstarted) {
logger(mesh, MESHLINK_ERROR, "Cannot join while started\n");
meshlink_errno = MESHLINK_EINVAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
// Refuse to join a mesh if we are already part of one. We are part of one if we know at least one other node.
if(mesh->nodes->count > 1) {
logger(mesh, MESHLINK_ERROR, "Already part of an existing mesh\n");
meshlink_errno = MESHLINK_EINVAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
- //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 a list of hostname/port tuples, a key hash and a cookie.
char *address = copy;
char *port = NULL;
- if(!b64decode(slash, mesh->hash, 18) || !b64decode(slash + 24, mesh->cookie, 18)) {
+ if(!b64decode(slash, state.hash, 18) || !b64decode(slash + 24, state.cookie, 18)) {
goto invalid;
}
+ if(mesh->inviter_commits_first) {
+ memcpy(state.cookie + 18, ecdsa_get_public_key(mesh->private_key), 32);
+ }
+
// Generate a throw-away key for the invitation.
- ecdsa_t *key = ecdsa_generate();
+ key = ecdsa_generate();
if(!key) {
meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
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.
if(ai) {
for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
- mesh->sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
+ state.sock = socket_in_netns(aip->ai_family, aip->ai_socktype, aip->ai_protocol, mesh->netns);
- if(mesh->sock == -1) {
+ if(state.sock == -1) {
logger(mesh, MESHLINK_DEBUG, "Could not open socket: %s\n", strerror(errno));
meshlink_errno = MESHLINK_ENETWORK;
continue;
}
- set_timeout(mesh->sock, 5000);
+ set_timeout(state.sock, 5000);
- if(connect(mesh->sock, aip->ai_addr, aip->ai_addrlen)) {
+ if(connect(state.sock, aip->ai_addr, aip->ai_addrlen)) {
logger(mesh, MESHLINK_DEBUG, "Could not connect to %s port %s: %s\n", address, port, strerror(errno));
meshlink_errno = MESHLINK_ENETWORK;
- closesocket(mesh->sock);
- mesh->sock = -1;
+ closesocket(state.sock);
+ state.sock = -1;
continue;
}
+
+ break;
}
freeaddrinfo(ai);
meshlink_errno = MESHLINK_ERESOLV;
}
- if(mesh->sock != -1 || !comma) {
+ if(state.sock != -1 || !comma) {
break;
}
address = comma;
}
- if(mesh->sock == -1) {
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ if(state.sock == -1) {
+ goto exit;
}
logger(mesh, MESHLINK_DEBUG, "Connected to %s port %s...\n", address, port);
// Tell him we have an invitation, and give him our throw-away key.
- mesh->blen = 0;
+ state.blen = 0;
- if(!sendline(mesh->sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
+ if(!sendline(state.sock, "0 ?%s %d.%d %s", b64key, PROT_MAJOR, PROT_MINOR, mesh->appname)) {
logger(mesh, MESHLINK_DEBUG, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
- closesocket(mesh->sock);
meshlink_errno = MESHLINK_ENETWORK;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
free(b64key);
char hisname[4096] = "";
int code, hismajor, hisminor = 0;
- 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) {
+ if(!recvline(&state) || sscanf(state.line, "%d %s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(&state) || !rstrip(state.line) || sscanf(state.line, "%d ", &code) != 1 || code != ACK || strlen(state.line) < 3) {
logger(mesh, MESHLINK_DEBUG, "Cannot read greeting from peer\n");
- closesocket(mesh->sock);
meshlink_errno = MESHLINK_ENETWORK;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
// Check if the hash of the key he gave us matches the hash in the URL.
- char *fingerprint = mesh->line + 2;
+ char *fingerprint = state.line + 2;
char hishash[64];
if(sha512(fingerprint, strlen(fingerprint), hishash)) {
- logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", mesh->line + 2);
+ logger(mesh, MESHLINK_DEBUG, "Could not create hash\n%s\n", state.line + 2);
meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
- if(memcmp(hishash, mesh->hash, 18)) {
- logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", mesh->line + 2);
+ if(memcmp(hishash, state.hash, 18)) {
+ logger(mesh, MESHLINK_DEBUG, "Peer has an invalid key!\n%s\n", state.line + 2);
meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
-
+ goto exit;
}
- ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
+ hiskey = ecdsa_set_base64_public_key(fingerprint);
if(!hiskey) {
meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
// Start an SPTPS session
- if(!sptps_start(&mesh->sptps, mesh, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
+ if(!sptps_start(&state.sptps, &state, true, false, key, hiskey, meshlink_invitation_label, sizeof(meshlink_invitation_label), invitation_send, invitation_receive)) {
meshlink_errno = MESHLINK_EINTERNAL;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
// Feed rest of input buffer to SPTPS
- if(!sptps_receive_data(&mesh->sptps, mesh->buffer, mesh->blen)) {
+ if(!sptps_receive_data(&state.sptps, state.buffer, state.blen)) {
meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
- int len;
+ ssize_t len;
+ logger(mesh, MESHLINK_DEBUG, "Starting invitation recv loop: %d %zu\n", state.sock, sizeof(state.line));
- while((len = recv(mesh->sock, mesh->line, sizeof(mesh)->line, 0))) {
+ while((len = recv(state.sock, state.line, sizeof(state.line), 0))) {
if(len < 0) {
if(errno == EINTR) {
continue;
logger(mesh, MESHLINK_DEBUG, "Error reading data from %s port %s: %s\n", address, port, strerror(errno));
meshlink_errno = MESHLINK_ENETWORK;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
- if(!sptps_receive_data(&mesh->sptps, mesh->line, len)) {
+ if(!sptps_receive_data(&state.sptps, state.line, len)) {
meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
}
- sptps_stop(&mesh->sptps);
- ecdsa_free(hiskey);
- ecdsa_free(key);
- closesocket(mesh->sock);
-
- if(!mesh->success) {
+ if(!state.success) {
logger(mesh, MESHLINK_DEBUG, "Connection closed by peer, invitation cancelled.\n");
meshlink_errno = MESHLINK_EPEER;
- pthread_mutex_unlock(&mesh->mutex);
- return false;
+ goto exit;
}
+ sptps_stop(&state.sptps);
+ ecdsa_free(hiskey);
+ ecdsa_free(key);
+ closesocket(state.sock);
+
pthread_mutex_unlock(&mesh->mutex);
return true;
invalid:
logger(mesh, MESHLINK_DEBUG, "Invalid invitation URL\n");
meshlink_errno = MESHLINK_EINVAL;
+exit:
+ sptps_stop(&state.sptps);
+ ecdsa_free(hiskey);
+ ecdsa_free(key);
+
+ if(state.sock != -1) {
+ closesocket(state.sock);
+ }
+
pthread_mutex_unlock(&mesh->mutex);
return false;
}
break;
}
- if(!config_write(mesh, "current", n->name, &config, mesh->config_key)) {
+ /* Clear the reachability times, since we ourself have never seen these nodes yet */
+ n->last_reachable = 0;
+ n->last_unreachable = 0;
+
+ if(!node_write_config(mesh, n)) {
free_node(n);
return false;
}
n->mtuprobes = 0;
n->status.udp_confirmed = false;
+ if(n->status.reachable) {
+ n->last_unreachable = mesh->loop.now.tv_sec;
+ }
+
/* Graph updates will suppress status updates for blacklisted nodes, so we need to
* manually call the status callback if necessary.
*/
n->status.blacklisted = false;
if(n->status.reachable) {
+ n->last_reachable = mesh->loop.now.tv_sec;
update_node_status(mesh, n);
}
pthread_mutex_unlock(&mesh->mutex);
}
+extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first) {
+ if(!mesh) {
+ meshlink_errno = EINVAL;
+ return;
+ }
+
+ pthread_mutex_lock(&mesh->mutex);
+ mesh->inviter_commits_first = inviter_commits_first;
+ pthread_mutex_unlock(&mesh->mutex);
+}
+
void handle_network_change(meshlink_handle_t *mesh, bool online) {
(void)online;
}
}
-
static void __attribute__((constructor)) meshlink_init(void) {
crypto_init();
}