redsocks: add new package

Redsocks is a daemon running on the local system, that will transparently
tunnel any TCP connection via a remote SOCKS4, SOCKS5 or HTTP proxy server. It
uses the system firewall's redirection facility to intercept TCP connections,
thus the redirection is system-wide, with fine-grained control, and does
not depend on LD_PRELOAD libraries.

Signed-off-by: Johannes Morgenroth <jm@m-network.de>

net/redsocks/files/redsocks.conf

@@ -0,0 +1,108 @@
+base {
+	// debug: connection progress & client list on SIGUSR1
+	log_debug = off;
+
+	// info: start and end of client session
+	log_info = on;
+
+	/* possible `log' values are:
+	 *   stderr
+	 *   "file:/path/to/file"
+	 *   syslog:FACILITY  facility is any of "daemon", "local0"..."local7"
+	 */
+	// log = stderr;
+	// log = "file:/path/to/file";
+	log = "syslog:local7";
+
+	// detach from console
+	daemon = on;
+
+	/* Change uid, gid and root directory, these options require root
+	 * privilegies on startup.
+	 * Note, your chroot may requre /etc/localtime if you write log to syslog.
+	 * Log is opened before chroot & uid changing.
+	 */
+	// user = nobody;
+	// group = nobody;
+	// chroot = "/var/chroot";
+
+	/* possible `redirector' values are:
+	 *   iptables   - for Linux
+	 *   ipf        - for FreeBSD
+	 *   pf         - for OpenBSD
+	 *   generic    - some generic redirector that MAY work
+	 */
+	redirector = iptables;
+}
+
+redsocks {
+	/* `local_ip' defaults to 127.0.0.1 for security reasons,
+	 * use 0.0.0.0 if you want to listen on every interface.
+	 * `local_*' are used as port to redirect to.
+	 */
+	local_ip = 127.0.0.1;
+	local_port = 12345;
+
+	// listen() queue length. Default value is SOMAXCONN and it should be
+	// good enough for most of us.
+	// listenq = 128; // SOMAXCONN equals 128 on my Linux box.
+
+	// `max_accept_backoff` is a delay to retry `accept()` after accept
+	// failure (e.g. due to lack of file descriptors). It's measured in
+	// milliseconds and maximal value is 65535. `min_accept_backoff` is
+	// used as initial backoff value and as a damper for `accept() after
+	// close()` logic.
+	// min_accept_backoff = 100;
+	// max_accept_backoff = 60000;
+
+	// `ip' and `port' are IP and tcp-port of proxy-server
+	// You can also use hostname instead of IP, only one (random)
+	// address of multihomed host will be used.
+	ip = example.org;
+	port = 1080;
+
+
+	// known types: socks4, socks5, http-connect, http-relay
+	type = socks5;
+
+	// login = "foobar";
+	// password = "baz";
+}
+
+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;
+
+	// redsocks knows about two options while redirecting UDP packets at
+	// linux: TPROXY and REDIRECT.  TPROXY requires more complex routing
+	// configuration and fresh kernel (>= 2.6.37 according to squid
+	// developers[1]) but has hack-free way to get original destination
+	// address, REDIRECT is easier to configure, but requires `dest_ip` and
+	// `dest_port` to be set, limiting packet redirection to single
+	// destination.
+	// [1] http://wiki.squid-cache.org/Features/Tproxy4
+	dest_ip = 8.8.8.8;
+	dest_port = 53;
+
+	udp_timeout = 30;
+	udp_timeout_stream = 180;
+}
+
+dnstc {
+	// fake and really dumb DNS server that returns "truncated answer" to
+	// every query via UDP, RFC-compliant resolver should repeat same query
+	// via TCP in this case.
+	local_ip = 127.0.0.1;
+	local_port = 5300;
+}
+
+// you can add more `redsocks' and `redudp' sections if you need.

net/redsocks/files/redsocks.init

@@ -0,0 +1,36 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2007 OpenWrt.org
+
+START=90
+
+# check if configuration exists
+[ -e "/etc/redsocks.conf" ] || exit 0
+
+start() {
+	if [ -e "/var/run/redsocks.pid" ]; then
+		echo "redsocks is already running"
+		exit 0
+	fi
+
+	/bin/echo -n "running redsocks ..."
+	
+	# startup the safety-wrapper for the daemon
+	/usr/sbin/redsocks -p /var/run/redsocks.pid
+	
+	/bin/echo " done"
+}
+
+stop() {
+	if [ ! -e "/var/run/redsocks.pid" ]; then
+		echo "redsocks is not running"
+		exit 0
+	fi
+
+	/bin/echo -n "stopping redsocks ..."
+	
+	# kill the process
+	/bin/kill $(cat /var/run/redsocks.pid)
+	rm /var/run/redsocks.pid
+	
+	echo " done"
+}