Function websocket_connection_in

connectd/connectd.c:473–562

~ I speak web socket . * * Actually that's dumb, websocket (aka rfc6455) looks nothing like that. */

 *
 * Actually that's dumb, websocket (aka rfc6455) looks nothing like that. */
static struct io_plan *websocket_connection_in(struct io_conn *conn,
					       struct daemon *daemon)
{
	int childmsg[2], execfail[2];
	pid_t childpid;
	int err;
	struct conn_in conn_in_arg;

	if (!get_remote_address(conn, &conn_in_arg.addr))
		return io_close(conn);

	status_debug("Websocket connection in from %s",
		     type_to_string(tmpctx, struct wireaddr_internal,
				    &conn_in_arg.addr));

	if (socketpair(AF_LOCAL, SOCK_STREAM, 0, childmsg) != 0)
		goto fail;

	if (pipe(execfail) != 0)
		goto close_msgfd_fail;

	if (fcntl(execfail[1], F_SETFD, fcntl(execfail[1], F_GETFD)
		  | FD_CLOEXEC) < 0)
		goto close_execfail_fail;

	childpid = fork();
	if (childpid < 0)
		goto close_execfail_fail;

	if (childpid == 0) {
		close(childmsg[0]);
		close(execfail[0]);

		/* Attach remote socket to stdin. */
		if (dup2(io_conn_fd(conn), STDIN_FILENO) == -1)
			goto child_errno_fail;

		/* Attach our socket to stdout. */
		if (dup2(childmsg[1], STDOUT_FILENO) == -1)
			goto child_errno_fail;

		/* Make (fairly!) sure all other fds are closed. */
		closefrom(STDERR_FILENO + 1);

		/* Tell websocket helper what we read so far. */
		execlp(daemon->websocket_helper, daemon->websocket_helper,
		       NULL);

	child_errno_fail:
		err = errno;
		/* Gcc's warn-unused-result fail. */
		if (write(execfail[1], &err, sizeof(err))) {
			;
		}
		exit(127);
	}

	close(childmsg[1]);