From 796c14b75c9e8066b4f68f6ce7cdaddd97c46a87 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Mon, 2 Sep 2013 00:11:04 +0200 Subject: [PATCH] Slightly relax the connection rate limit for a single address. The restriction of accepting only 1 connection per second from a single address is a bit too much, especially if one wants to join a VPN using an invitation, which requires two connections. --- src/net_socket.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/src/net_socket.c b/src/net_socket.c index d0beb19f..ab3c17e0 100644 --- a/src/net_socket.c +++ b/src/net_socket.c @@ -602,10 +602,22 @@ void handle_new_meta_connection(void *data, int flags) { tarpit = -1; } - if(prev_time == now.tv_sec && !sockaddrcmp_noport(&sa, &prev_sa)) { - // if so, keep the connection open but ignore it completely. - tarpit = fd; - return; + if(!sockaddrcmp_noport(&sa, &prev_sa)) { + static int samehost_burst; + static int samehost_burst_time; + + if(now.tv_sec - samehost_burst_time > samehost_burst) + samehost_burst = 0; + else + samehost_burst -= now.tv_sec - samehost_burst_time; + + samehost_burst_time = now.tv_sec; + samehost_burst++; + + if(samehost_burst > max_connection_burst) { + tarpit = fd; + return; + } } memcpy(&prev_sa, &sa, sizeof sa); -- 2.20.1