GitLab

network.c:pending_socks_cb():

...
    /* Figure out where we actually connected to, and tell the socks client */
    if (getpeername(bufferevent_getfd(bev), sa, &slen) == 0) {
      socks_state_set_address(socks, sa);
      if (!down->peername)
        down->peername = printable_address(sa, slen);
    }
    socks_send_reply(socks, bufferevent_get_output(up->buffer), 0);
...

If getpeername() fails, we shouldn't proceed with sending a positive SOCKS reply.

socks_send_reply also messes around with socks_state_t.parsereq which is not filled if socks_state_set_address was not called.