}
}
-bool do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
- char *address, *port, *space;
- struct addrinfo *proxyai = NULL;
- int result;
+static bool get_recent(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ node_t *n = lookup_node(mesh, outgoing->name);
-begin:
+ if(!n) {
+ return false;
+ }
- if(!outgoing->ai && !outgoing->nai) {
- if(!outgoing->cfg) {
- logger(mesh, MESHLINK_ERROR, "Could not set up a meta connection to %s", outgoing->name);
- retry_outgoing(mesh, outgoing);
- return false;
+ outgoing->ai = get_known_addresses(n);
+ outgoing->aip = outgoing->ai;
+ return outgoing->aip;
+}
+
+static bool get_next_ai(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ if(!outgoing->ai) {
+ char *address = NULL;
+
+ if(get_config_string(outgoing->cfg, &address)) {
+ char *port;
+ char *space = strchr(address, ' ');
+
+ if(space) {
+ port = xstrdup(space + 1);
+ *space = 0;
+ } else {
+ if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port)) {
+ logger(mesh, MESHLINK_ERROR, "No Port known for %s", outgoing->name);
+ return false;
+ }
+ }
+
+ outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
+ free(port);
+ free(address);
}
- get_config_string(outgoing->cfg, &address);
+ outgoing->aip = outgoing->ai;
+ } else {
+ outgoing->aip = outgoing->aip->ai_next;
+ }
- space = strchr(address, ' ');
+ return outgoing->aip;
+}
- if(space) {
- port = xstrdup(space + 1);
- *space = 0;
- } else {
- // TODO: Only allow Address statements?
- if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port)) {
- logger(mesh, MESHLINK_ERROR, "No Port known for %s", outgoing->name);
- retry_outgoing(mesh, outgoing);
- return false;
+static bool get_next_cfg(meshlink_handle_t *mesh, outgoing_t *outgoing, char *variable) {
+ (void)mesh;
+
+ if(!outgoing->cfg) {
+ outgoing->cfg = lookup_config(outgoing->config_tree, variable);
+ } else {
+ outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
+ }
+
+ return outgoing->cfg;
+}
+
+static bool get_next_outgoing_address(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ bool start = false;
+
+ if(outgoing->state == OUTGOING_START) {
+ start = true;
+ outgoing->state = OUTGOING_CANONICAL;
+ }
+
+ if(outgoing->state == OUTGOING_CANONICAL) {
+ while(outgoing->aip || get_next_cfg(mesh, outgoing, "CanonicalAddress")) {
+ if(get_next_ai(mesh, outgoing)) {
+ return true;
+ } else {
+ freeaddrinfo(outgoing->ai);
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
}
}
- outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
- free(address);
- free(port);
-
- outgoing->aip = outgoing->ai;
- outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
+ outgoing->state = OUTGOING_RECENT;
}
- if(!outgoing->aip) {
- if(outgoing->ai) {
- freeaddrinfo(outgoing->ai);
+ if(outgoing->state == OUTGOING_RECENT) {
+ while(outgoing->aip || get_next_cfg(mesh, outgoing, "Address")) {
+ if(get_next_ai(mesh, outgoing)) {
+ return true;
+ } else {
+ freeaddrinfo(outgoing->ai);
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
+ }
}
- outgoing->ai = NULL;
+ outgoing->state = OUTGOING_KNOWN;
+ }
+
+ if(outgoing->state == OUTGOING_KNOWN) {
+ if(!outgoing->aip) {
+ get_recent(mesh, outgoing);
+ } else {
+ outgoing->aip = outgoing->aip->ai_next;
+ }
- if(outgoing->nai) {
- free_known_addresses(outgoing->nai);
+ if(outgoing->aip) {
+ return true;
+ } else {
+ free_known_addresses(outgoing->ai);
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
}
- outgoing->nai = NULL;
+ outgoing->state = OUTGOING_END;
+ }
- goto begin;
+ if(start) {
+ outgoing->state = OUTGOING_NO_KNOWN_ADDRESSES;
+ }
+
+ return false;
+}
+
+bool do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ struct addrinfo *proxyai = NULL;
+ int result;
+
+begin:
+
+ if(!get_next_outgoing_address(mesh, outgoing)) {
+ if(outgoing->state == OUTGOING_NO_KNOWN_ADDRESSES) {
+ logger(mesh, MESHLINK_ERROR, "No known addresses for %s", outgoing->name);
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Could not set up a meta connection to %s", outgoing->name);
+ retry_outgoing(mesh, outgoing);
+ }
+
+ return false;
}
connection_t *c = new_connection();
c->outgoing = outgoing;
memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
- outgoing->aip = outgoing->aip->ai_next;
char *hostname = sockaddr2hostname(&c->address);
}
if(c->socket == -1) {
- logger(mesh, MESHLINK_ERROR, "Creating socket for %s at %s failed: %s", c->name, c->hostname, sockstrerror(sockerrno));
+ logger(mesh, MESHLINK_ERROR, "Creating socket for %s at %s failed: %s", c->name, hostname, sockstrerror(sockerrno));
free_connection(c);
free(hostname);
goto begin;
return;
}
+
+ if(outgoing->ai) {
+ if(outgoing->state == OUTGOING_KNOWN) {
+ free_known_addresses(outgoing->ai);
+ } else {
+ freeaddrinfo(outgoing->ai);
+ }
+ }
+
+ outgoing->cfg = NULL;
+
exit_configuration(&outgoing->config_tree); // discard old configuration if present
init_configuration(&outgoing->config_tree);
read_host_config(mesh, outgoing->config_tree, outgoing->name);
- outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
-
get_config_bool(lookup_config(outgoing->config_tree, "blacklisted"), &blacklisted);
+ outgoing->state = OUTGOING_START;
+
if(blacklisted) {
return;
}
- if(!outgoing->cfg) {
- if(n) {
- outgoing->aip = outgoing->nai = get_known_addresses(n);
- }
-
- if(!outgoing->nai) {
- logger(mesh, MESHLINK_ERROR, "No address known for %s", outgoing->name);
- return;
- }
+ if(mesh->connection_try_cb) {
+ node_t *n = lookup_node(mesh, outgoing->name);
+ mesh->connection_try_cb(mesh, (struct meshlink_node *)n);
}
do_outgoing_connection(mesh, outgoing);
}
+/// Delayed close of a filedescriptor.
+static void tarpit(int fd) {
+ static int pits[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
+ static int next_pit = 0;
+
+ if(pits[next_pit] != -1) {
+ closesocket(pits[next_pit]);
+ }
+
+ pits[next_pit++] = fd;
+
+ if(next_pit >= (int)(sizeof pits / sizeof pits[0])) {
+ next_pit = 0;
+ }
+}
+
/*
accept a new tcp connect and create a
new connection
meshlink_handle_t *mesh = loop->data;
listen_socket_t *l = data;
connection_t *c;
- sockaddr_t sa;
+ sockaddr_t sa = {0};
int fd;
socklen_t len = sizeof(sa);
sockaddrunmap(&sa);
- // Check if we get many connections from the same host
-
- static sockaddr_t prev_sa;
- static int tarpit = -1;
-
- if(tarpit >= 0) {
- closesocket(tarpit);
- tarpit = -1;
- }
-
- if(!sockaddrcmp_noport(&sa, &prev_sa)) {
- static int samehost_burst;
- static int samehost_burst_time;
-
- if(mesh->loop.now.tv_sec - samehost_burst_time > samehost_burst) {
- samehost_burst = 0;
- } else {
- samehost_burst -= mesh->loop.now.tv_sec - samehost_burst_time;
- }
-
- samehost_burst_time = mesh->loop.now.tv_sec;
- samehost_burst++;
-
- if(samehost_burst > max_connection_burst) {
- tarpit = fd;
- return;
- }
- }
-
- memcpy(&prev_sa, &sa, sizeof(sa));
-
- // Check if we get many connections from different hosts
+ /* Rate limit incoming connections to max_connection_burst/second. */
static int connection_burst;
static int connection_burst_time;
- if(mesh->loop.now.tv_sec - connection_burst_time > connection_burst) {
+ if(mesh->loop.now.tv_sec != connection_burst_time) {
+ connection_burst_time = mesh->loop.now.tv_sec;
connection_burst = 0;
- } else {
- connection_burst -= mesh->loop.now.tv_sec - connection_burst_time;
}
- connection_burst_time = mesh->loop.now.tv_sec;
- connection_burst++;
-
if(connection_burst >= max_connection_burst) {
- connection_burst = max_connection_burst;
- tarpit = fd;
+ tarpit(fd);
return;
}
+ connection_burst++;
+
// Accept the new connection
c = new_connection();
c->last_ping_time = mesh->loop.now.tv_sec;
char *hostname = sockaddr2hostname(&sa);
- logger(mesh, MESHLINK_INFO, "Connection from %s", c->hostname);
+ logger(mesh, MESHLINK_INFO, "Connection from %s", hostname);
free(hostname);
io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ);
timeout_del(&mesh->loop, &outgoing->ev);
if(outgoing->ai) {
- freeaddrinfo(outgoing->ai);
- }
-
- if(outgoing->nai) {
- free_known_addresses(outgoing->nai);
+ if(outgoing->state == OUTGOING_KNOWN) {
+ free_known_addresses(outgoing->ai);
+ } else {
+ freeaddrinfo(outgoing->ai);
+ }
}
if(outgoing->config_tree) {
if(!check_id(name)) {
logger(mesh, MESHLINK_ERROR,
- "Invalid name for outgoing connection in %s line %d",
- cfg->file, cfg->line);
+ "Invalid name for outgoing connection in line %d",
+ cfg->line);
free(name);
continue;
}
projects / meshlink / blobdiff