From 72ca111da681086dc39151d88e46cac3f64e4e7c Mon Sep 17 00:00:00 2001
From: Martin Schanzenbach <mschanzenbach@posteo.de>
Date: Fri, 2 Mar 2012 11:18:26 +0000
Subject: [PATCH] -add proxy

---
 src/gns/proxy/proxy.py | 142 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 src/gns/proxy/proxy.py

diff --git a/src/gns/proxy/proxy.py b/src/gns/proxy/proxy.py
new file mode 100644
index 000000000..8fdec115e
--- /dev/null
+++ b/src/gns/proxy/proxy.py
@@ -0,0 +1,142 @@
+#!/usr/bin/python
+
+__doc__ = """Tiny HTTP Proxy.
+
+This module implements GET, HEAD, POST, PUT and DELETE methods
+on BaseHTTPServer, and behaves as an HTTP proxy.  The CONNECT
+method is also implemented experimentally, but has not been
+tested yet.
+
+Any help will be greatly appreciated.   SUZUKI Hisao
+"""
+
+__version__ = "0.2.1"
+
+import BaseHTTPServer, select, socket, SocketServer, urlparse, re
+
+class ProxyHandler (BaseHTTPServer.BaseHTTPRequestHandler):
+    __base = BaseHTTPServer.BaseHTTPRequestHandler
+    __base_handle = __base.handle
+
+    server_version = "TinyHTTPProxy/" + __version__
+    rbufsize = 0                        # self.rfile Be unbuffered
+    host_port = ()
+
+    def handle(self):
+        (ip, port) =  self.client_address
+        if hasattr(self, 'allowed_clients') and ip not in self.allowed_clients:
+            self.raw_requestline = self.rfile.readline()
+            if self.parse_request(): self.send_error(403)
+        else:
+            self.__base_handle()
+
+    def _connect_to(self, netloc, soc):
+        i = netloc.find(':')
+        if i >= 0:
+            self.host_port = netloc[:i], int(netloc[i+1:])
+        else:
+            self.host_port = netloc, 80
+        print "\t" "connect to %s:%d" % self.host_port
+        try: soc.connect(self.host_port)
+        except socket.error, arg:
+            try: msg = arg[1]
+            except: msg = arg
+            self.send_error(404, msg)
+            return 0
+        return 1
+
+    def do_CONNECT(self):
+        soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        try:
+            if self._connect_to(self.path, soc):
+                self.log_request(200)
+                self.wfile.write(self.protocol_version +
+                                 " 200 Connection established\r\n")
+                self.wfile.write("Proxy-agent: %s\r\n" % self.version_string())
+                self.wfile.write("\r\n")
+                self._read_write(soc, 300)
+        finally:
+            print "\t" "bye"
+            soc.close()
+            self.connection.close()
+
+    def do_GET(self):
+        (scm, netloc, path, params, query, fragment) = urlparse.urlparse(
+            self.path, 'http')
+        if scm != 'http' or fragment or not netloc:
+            self.send_error(400, "bad url %s" % self.path)
+            return
+        soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        try:
+            if self._connect_to(netloc, soc):
+                self.log_request()
+                soc.send("%s %s %s\r\n" % (
+                    self.command,
+                    urlparse.urlunparse(('', '', path, params, query, '')),
+                    self.request_version))
+                self.headers['Connection'] = 'close'
+                del self.headers['Proxy-Connection']
+                for key_val in self.headers.items():
+                    soc.send("%s: %s\r\n" % key_val)
+                soc.send("\r\n")
+                self._read_write(soc)
+        finally:
+            print "\t" "bye"
+            soc.close()
+            self.connection.close()
+
+    def _read_write(self, soc, max_idling=20):
+        iw = [self.connection, soc]
+        ow = []
+        count = 0
+        msg = ''
+        while 1:
+            count += 1
+            (ins, _, exs) = select.select(iw, ow, iw, 3)
+            if exs:
+              break
+            if ins:
+                for i in ins:
+                    if i is soc:
+                        out = self.connection
+                    else:
+                        out = soc
+                    data = i.recv(8192)
+                    if data:
+                        if (re.match("(\w+\.)*gnunet", self.host_port[0])):
+                            arr = self.host_port[0].split(' ')
+                            arr.pop(0)
+                            data = re.sub(r'(a href="http://(\w+\.)*)(\+)', r'\1'+self.host_port[0], data)
+                        print data
+                        out.send(data)
+                        count = 0
+            else:
+                print "\t" "idle", count
+                print msg
+            if count == max_idling: break
+
+    do_HEAD = do_GET
+    do_POST = do_GET
+    do_PUT  = do_GET
+    do_DELETE=do_GET
+
+class ThreadingHTTPServer (SocketServer.ThreadingMixIn,
+                           BaseHTTPServer.HTTPServer): pass
+
+if __name__ == '__main__':
+    from sys import argv
+    if argv[1:] and argv[1] in ('-h', '--help'):
+        print argv[0], "[port [allowed_client_name ...]]"
+    else:
+        if argv[2:]:
+            allowed = []
+            for name in argv[2:]:
+                client = socket.gethostbyname(name)
+                allowed.append(client)
+                print "Accept: %s (%s)" % (client, name)
+            ProxyHandler.allowed_clients = allowed
+            del argv[2:]
+        else:
+            print "Any clients will be served..."
+        BaseHTTPServer.test(ProxyHandler, ThreadingHTTPServer)
+
-- 
2.25.1