Osmocom Mobile Switching Centre
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#!/usr/bin/env python
# Simple server for mgcp... send audit, receive response..
import socket, time
rsip_resp = """200 321321332\r\n"""
audit_packet = """AUEP %d 13@mgw MGCP 1.0\r\n"""
crcx_packet = """CRCX %d 14@mgw MGCP 1.0\r\nC: 4a84ad5d25f\r\nL: p:20, a:GSM-EFR, nt:IN\r\nM: recvonly\r\n"""
dlcx_packet = """DLCX %d 14@mgw MGCP 1.0\r\nC: 4a84ad5d25f\r\nI: %d\r\n"""
mdcx_packet = """MDCX %d 14@mgw MGCP 1.0\r\nC: 4a84ad5d25f\r\nI: %d\r\nL: p:20, a:GSM-EFR, nt:IN\r\nM: recvonly\r\n\r\nv=0\r\no=- 258696477 0 IN IP4\r\ns=-\r\nc=IN IP4\r\nt=0 0\r\nm=audio 6666 RTP/AVP 127\r\na=rtpmap:127 GSM-EFR/8000/1\r\na=ptime:20\r\na=recvonly\r\nm=image 4402 udptl t38\r\na=T38FaxVersion:0\r\na=T38MaxBitRate:14400\r\n"""
def hexdump(src, length=8):
"""Recipe is from http://code.activestate.com/recipes/142812/"""
result = []
digits = 4 if isinstance(src, unicode) else 2
for i in xrange(0, len(src), length):
s = src[i:i+length]
hexa = b' '.join(["%0*X" % (digits, ord(x)) for x in s])
text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s])
result.append( b"%04X %-*s %s" % (i, length*(digits + 1), hexa, text) )
return b'\n'.join(result)
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_socket.bind(("", MGCP_CALLAGENT_PORT))
last_ci = 1
def send_and_receive(packet):
global last_ci
server_socket.sendto(packet, ("", MGCP_GATEWAY_PORT))
data, addr = server_socket.recvfrom(4096)
# attempt to store the CI of the response
list = data.split("\n")
for item in list:
if item.startswith("I: "):
last_ci = int(item[3:])
print hexdump(data), addr
except socket.error, e:
print e
def generate_tid():
import random
return random.randint(0, 65123)
while True:
send_and_receive(audit_packet % generate_tid())
send_and_receive(crcx_packet % generate_tid() )
send_and_receive(mdcx_packet % (generate_tid(), last_ci))
send_and_receive(dlcx_packet % (generate_tid(), last_ci))