#define MSG_NOSIGNAL 0
#endif
-static const int max_connection_burst = 100;
-
/* Setup sockets */
static void configure_tcp(connection_t *c) {
do_outgoing_connection(mesh, outgoing);
}
-/// Delayed close of a filedescriptor.
-static void tarpit(meshlink_handle_t *mesh, int fd) {
- if(!fd) {
- return;
- }
-
- if(mesh->pits[mesh->next_pit]) {
- closesocket(mesh->pits[mesh->next_pit]);
- }
-
- mesh->pits[mesh->next_pit++] = fd;
-
- if(mesh->next_pit >= (int)(sizeof mesh->pits / sizeof mesh->pits[0])) {
- mesh->next_pit = 0;
- }
-}
-
-/*
- accept a new tcp connect and create a
- new connection
-*/
-void handle_new_meta_connection(event_loop_t *loop, void *data, int flags) {
- (void)flags;
- meshlink_handle_t *mesh = loop->data;
- listen_socket_t *l = data;
- connection_t *c;
- sockaddr_t sa;
- int fd;
- socklen_t len = sizeof(sa);
-
- memset(&sa, 0, sizeof(sa));
-
- fd = accept(l->tcp.fd, &sa.sa, &len);
-
- if(fd < 0) {
- if(sockwouldblock(errno)) {
- return;
- }
-
- if(errno == EINVAL) { // TODO: check if Windows agrees
- event_loop_stop(loop);
- return;
- }
-
- logger(mesh, MESHLINK_ERROR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
- return;
- }
-
- sockaddrunmap(&sa);
-
- /* Rate limit incoming connections to max_connection_burst/second. */
-
- if(mesh->loop.now.tv_sec != mesh->connection_burst_time) {
- mesh->connection_burst_time = mesh->loop.now.tv_sec;
- mesh->connection_burst = 0;
- }
-
- if(mesh->connection_burst >= max_connection_burst) {
- tarpit(mesh, fd);
- return;
- }
-
- mesh->connection_burst++;
-
- // Accept the new connection
-
- c = new_connection();
- c->name = xstrdup("<unknown>");
-
- c->address = sa;
- c->socket = fd;
- c->last_ping_time = mesh->loop.now.tv_sec;
-
- char *hostname = sockaddr2hostname(&sa);
- logger(mesh, MESHLINK_INFO, "Connection from %s", hostname);
- free(hostname);
-
- io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ);
-
- configure_tcp(c);
-
- connection_add(mesh, c);
-
- c->allow_request = ID;
- send_id(mesh, c);
-}
-
static void free_outgoing(outgoing_t *outgoing) {
meshlink_handle_t *mesh = outgoing->node->mesh;