Initial UDP over Socks5 support.

Makefile

@@ -3,7 +3,7 @@ CFLAGS=-std=gnu99 -Wall -g -O0
 .PHONY: all
 all: redsocks
 
-obj = parser.o main.o redsocks.o log.o http-connect.o socks4.o socks5.o http-relay.o base.o utils.o
+obj = parser.o main.o redsocks.o log.o http-connect.o socks4.o socks5.o http-relay.o base.o utils.o redudp.o
 src = $(patsubst %.o,%.c,$(obj))
 
 redsocks: $(obj)

README

@@ -28,6 +28,8 @@ Features
 Redirect any TCP connection to SOCKS4, SOCKS5 or HTTPS (HTTP/CONNECT)
 proxy server.
 
+Redirect UDP packets via SOCKS5 proxy server.
+
 Login/password authentication is supported for SOCKS5 connections.
 SOCKS4 supports only username, password is ignored.
 

main.c

@@ -29,12 +29,12 @@
 
 extern app_subsys redsocks_subsys;
 extern app_subsys base_subsys;
-// extern app_subsys reddns_subsys;
+extern app_subsys redudp_subsys;
 
 app_subsys *subsystems[] = {
 	&redsocks_subsys,
 	&base_subsys,
-//	&reddns_subsys,
+	&redudp_subsys,
 };
 
 static const char *confname = "redsocks.conf";

redsocks.conf.example

@@ -53,4 +53,29 @@ redsocks {
 	// password = "baz";
 }
 
-// you can add one more `redsocks' section if you need.
+redudp {
+	// `local_ip' should not be 0.0.0.0 as it's also used for outgoing
+	// packets that are sent as replies - and it should be fixed
+	// if we want NAT to work properly.
+	local_ip = 127.0.0.1;
+	local_port = 10053;
+
+	// `ip' and `port' of socks5 proxy server.
+	ip = 10.0.0.1;
+	port = 1080;
+	login = username;
+	password = pazzw0rd;
+
+	// kernel does not give us this information, so we have to duplicate it
+	// in both iptables rules and configuration file.  By the way, you can
+	// set `local_ip' to 127.45.67.89 if you need more than 65535 ports to
+	// forward ;-)
+	// This limitation may be relaxed in future versions using contrack-tools.
+	dest_ip = 8.8.8.8;
+	dest_port = 53;
+
+	udp_timeout = 30;
+	udp_timeout_stream = 180;
+}
+
+// you can add more `redsocks' and `redudp' sections if you need.