From 4e53f1ee908949c0dcafd822bf05f9523e00d189 Mon Sep 17 00:00:00 2001
From: Aldo Cortesi <aldo@nullcube.com>
Date: Sat, 16 Jun 2012 13:38:10 +1200
Subject: Rename our tcpserver to netlib, expand to include client network
 functions.

---
 libmproxy/netlib.py | 173 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 libmproxy/netlib.py

(limited to 'libmproxy/netlib.py')

diff --git a/libmproxy/netlib.py b/libmproxy/netlib.py
new file mode 100644
index 00000000..65dbee63
--- /dev/null
+++ b/libmproxy/netlib.py
@@ -0,0 +1,173 @@
+import select, socket, threading
+from OpenSSL import SSL
+
+
+class NetLibError(Exception): pass
+
+
+class FileLike:
+    def __init__(self, o):
+        self.o = o
+
+    def __getattr__(self, attr):
+        return getattr(self.o, attr)
+
+    def flush(self):
+        pass
+
+    def read(self, length):
+        result = ''
+        while len(result) < length:
+            try:
+                data = self.o.read(length)
+            except AttributeError:
+                break
+            except SSL.ZeroReturnError:
+                break
+            if not data:
+                break
+            result += data
+        return result
+
+    def write(self, v):
+        self.o.sendall(v)
+
+    def readline(self, size = None):
+        result = ''
+        bytes_read = 0
+        while True:
+            if size is not None and bytes_read >= size:
+                break
+            ch = self.read(1)
+            bytes_read += 1
+            if not ch:
+                break
+            else:
+                result += ch
+                if ch == '\n':
+                    break
+        return result
+
+
+class TCPClient:
+    def __init__(self, ssl, host, port, clientcert):
+        self.ssl, self.host, self.port, self.clientcert = ssl, host, port, clientcert
+        self.sock, self.rfile, self.wfile = None, None, None
+        self.cert = None
+        self.connect()
+
+    def connect(self):
+        try:
+            addr = socket.gethostbyname(self.host)
+            server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            if self.ssl:
+                context = SSL.Context(SSL.SSLv23_METHOD)
+                if self.clientcert:
+                    context.use_certificate_file(self.clientcert)
+                server = SSL.Connection(context, server)
+            server.connect((addr, self.port))
+            if self.ssl:
+                self.cert = server.get_peer_certificate()
+                self.rfile, self.wfile = FileLike(server), FileLike(server)
+            else:
+                self.rfile, self.wfile = server.makefile('rb'), server.makefile('wb')
+        except socket.error, err:
+            raise NetLibError('Error connecting to "%s": %s' % (self.host, err))
+        self.sock = server
+
+
+class BaseHandler:
+    rbufsize = -1
+    wbufsize = 0
+    def __init__(self, connection, client_address, server):
+        self.connection = connection
+        self.rfile = self.connection.makefile('rb', self.rbufsize)
+        self.wfile = self.connection.makefile('wb', self.wbufsize)
+
+        self.client_address = client_address
+        self.server = server
+        self.handle()
+        self.finish()
+
+    def convert_to_ssl(self, cert, key):
+        ctx = SSL.Context(SSL.SSLv23_METHOD)
+        ctx.use_privatekey_file(key)
+        ctx.use_certificate_file(cert)
+        self.connection = SSL.Connection(ctx, self.connection)
+        self.connection.set_accept_state()
+        self.rfile = FileLike(self.connection)
+        self.wfile = FileLike(self.connection)
+
+    def finish(self):
+        try:
+            if not getattr(self.wfile, "closed", False):
+                self.wfile.flush()
+            self.connection.close()
+            self.wfile.close()
+            self.rfile.close()
+        except IOError:
+            pass
+
+    def handle(self):
+        raise NotImplementedError
+
+
+class TCPServer:
+    request_queue_size = 20
+    def __init__(self, server_address):
+        self.server_address = server_address
+        self.__is_shut_down = threading.Event()
+        self.__shutdown_request = False
+        self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        self.socket.bind(self.server_address)
+        self.server_address = self.socket.getsockname()
+        self.socket.listen(self.request_queue_size)
+
+    def fileno(self):
+        return self.socket.fileno()
+
+    def request_thread(self, request, client_address):
+        try:
+            self.handle_connection(request, client_address)
+            request.close()
+        except:
+            self.handle_error(request, client_address)
+            request.close()
+
+    def serve_forever(self, poll_interval=0.5):
+        self.__is_shut_down.clear()
+        try:
+            while not self.__shutdown_request:
+                r, w, e = select.select([self], [], [], poll_interval)
+                if self in r:
+                    try:
+                        request, client_address = self.socket.accept()
+                    except socket.error:
+                        return
+                    try:
+                        t = threading.Thread(target = self.request_thread,
+                                             args = (request, client_address))
+                        t.setDaemon (1)
+                        t.start()
+                    except:
+                        self.handle_error(request, client_address)
+                        request.close()
+        finally:
+            self.__shutdown_request = False
+            self.__is_shut_down.set()
+
+    def shutdown(self):
+        self.__shutdown_request = True
+        self.__is_shut_down.wait()
+
+    def handle_error(self, request, client_address):
+        print '-'*40
+        print 'Exception happened during processing of request from',
+        print client_address
+        import traceback
+        traceback.print_exc() # XXX But this goes to stderr!
+        print '-'*40
+
+    def handle_connection(self, request, client_address):
+        raise NotImplementedError
-- 
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