X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet.c;h=ab4b635b0444985092db12edd69bd7b5b3912029;hb=e050753d1fc4d4465032919746c2a4db78f19932;hp=5d84741d0472aa66a99ee063f7879a719212595d;hpb=6123ed30992d671b94fc016660086be6a62a3871;p=tinc

diff --git a/src/net.c b/src/net.c
index 5d84741d..ab4b635b 100644
--- a/src/net.c
+++ b/src/net.c
@@ -1,7 +1,7 @@
 /*
     net.c -- most of the network code
     Copyright (C) 1998-2005 Ivo Timmermans,
-                  2000-2017 Guus Sliepen <guus@tinc-vpn.org>
+                  2000-2021 Guus Sliepen <guus@tinc-vpn.org>
                   2006      Scott Lamb <slamb@slamb.org>
                   2011      Loïc Grenié <loic.grenie@gmail.com>
 
@@ -92,6 +92,22 @@ void purge(void) {
 	}
 }
 
+/* Put a misbehaving connection in the tarpit */
+void tarpit(int fd) {
+	static int pits[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
+	static unsigned int next_pit = 0;
+
+	if(pits[next_pit] != -1) {
+		closesocket(pits[next_pit]);
+	}
+
+	pits[next_pit++] = fd;
+
+	if(next_pit >= sizeof pits / sizeof pits[0]) {
+		next_pit = 0;
+	}
+}
+
 /*
   Terminate a connection:
   - Mark it as inactive
@@ -218,6 +234,7 @@ static void timeout_handler(void *data) {
 				logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname);
 			} else {
 				logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname);
+				c->status.tarpit = true;
 			}
 
 			terminate_connection(c, c->edge);
@@ -285,6 +302,10 @@ static void periodic_handler(void *data) {
 
 void handle_meta_connection_data(connection_t *c) {
 	if(!receive_meta(c)) {
+		if(!c->status.control) {
+			c->status.tarpit = true;
+		}
+
 		terminate_connection(c, c->edge);
 		return;
 	}
@@ -383,20 +404,18 @@ int reload_configuration(void) {
 		while(cfg) {
 			subnet_t *subnet, *s2;
 
-			if(!get_config_subnet(cfg, &subnet)) {
-				continue;
-			}
+			if(get_config_subnet(cfg, &subnet)) {
+				if((s2 = lookup_subnet(myself, subnet))) {
+					if(s2->expires == 1) {
+						s2->expires = 0;
+					}
 
-			if((s2 = lookup_subnet(myself, subnet))) {
-				if(s2->expires == 1) {
-					s2->expires = 0;
+					free_subnet(subnet);
+				} else {
+					subnet_add(myself, subnet);
+					send_add_subnet(everyone, subnet);
+					subnet_update(myself, subnet, true);
 				}
-
-				free_subnet(subnet);
-			} else {
-				subnet_add(myself, subnet);
-				send_add_subnet(everyone, subnet);
-				subnet_update(myself, subnet, true);
 			}
 
 			cfg = lookup_config_next(config_tree, cfg);