new post: fast and simple proxy server

_posts/2011-10-02-fast-and-simple-proxy-server.markdown

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+---
+layout: post
+title: fast and simple proxy server
+date: 02.10.2011 01:27
+---
+
+So you have this friend sitting somewhere else in the world and want to give him a simple proxy to access a geoip-protected site or something similar.  But what tool to use?
+
+When searching for a proxy I found [dante](http://www.inet.no/dante/), but found it just to hard to just configure in a few minutes.
+
+I'm a ruby programmer and I knew [Github](https://github) once released a small open-source proxy programm.
+It's called [proxymachine](https://github.com/mojombo/proxymachine), made by [@mojombo](https://github.com/mojombo/), one of the founders of github.
+
+Get it with:
+
+    gem install proxymachine
+{:lang="text"}
+
+and you're nearly done.
+
+Pipe the following into a text file:
+
+    proxy do |data|
+      next  if data.size < 9
+      v, c, port, o1, o2, o3, o4, user = data.unpack("CCnC4a*")
+      return { :close => "\x0\x5b\x0\x0\x0\x0\x0\x0" }  if v != 4 or c != 1
+      next  if ! idx = user.index("\x0")
+      {
+        :remote => "#{[o1,o2,o3,o4]*'.'}:#{port}",
+        :reply => "\x0\x5a\x0\x0\x0\x0\x0\x0",
+        :data => data[idx+9..-1]
+      }
+    end
+{:lang="ruby"}
+
+and start it with
+
+    proxymachine -h 0.0.0.0 -p 1234 -c your_socks_config.rb
+{:lang="text"}
+
+Tada! You got your own [SOCKS4](http://en.wikipedia.org/wiki/SOCKS#SOCKS4) Proxy up and running.
+
+[@nerdsein](https://twitter.com/#!/nerdsein/status/120258441041297409) got another solution: [Mocks](http://sourceforge.net/projects/mocks/), "**M**y **O**wn so**CK**s **S**erver."
+Download it over at Sourceforge, unpack it and compile the code with:
+
+    gcc -lnsl -o mocks child.c error.c misc.c socksd.c up_proxy.c
+{:lang="text"}
+
+You can configure a little bit more than with proxymachine, but you can stick with the default config for now:
+
+
+    PORT                    = 10080
+    MOCKS_ADDR              = 0.0.0.0
+    LOG_FILE                = mocks.log
+    PID_FILE                = mocks.pid
+    BUFFER_SIZE             = 65536
+    BACKLOG                 = 5
+    NEGOTIATION_TIMEOUT     = 5
+    CONNECTION_IDLE_TIMEOUT = 300
+    BIND_TIMEOUT            = 30
+    SHUTDOWN_TIMEOUT        = 3
+    MAX_CONNECTIONS         = 50
+
+    FILTER_POLICY    = ALLOW
+{:lang="text"}
+
+See the README and the config file in the archive for comments on it. Then start it with:
+
+    src/mocks -c mocks.config start
+{:lang="text"}
+
+and kill it with:
+
+    src/mocks -c mocks.config shutdown
+{:lang="text"}
+
+Oh, and in case you have the possibility to just ssh to the server, you can start up a SOCKS proxy on this connection, too:
+
+    ssh -D1234 example.com
+{:lang="text"}