[mgcp] Add a simple mgcp gateway used for the BSC
The python script is a simple call-agent driving the client. Currently it is sending a AuditEndpoint message and is printing the result. The bsc_mgcp.c is a standalone process that will implement a MGCP Gateway for the MSC. On call handling the Call-Agent will ask the Gateway to "CreateConnection" and then this gateway needs to communicate with OpenBSC. Currently CreateConnection,ModifiyConnection,DeleteConnection and Endpoint auditing is implemented. [mgcp] Send RSIP on start and on first receive of any message Ignore the first request and send a RSIP. We do that because we might tunnel UDP through some other things and have no direct way to connect to the call-agent. Also the transaction is not checked and we ignore the response from the call-agent, actually we print the '200 ' or any other value as unhandled... [mgcp] Print the MGCP command next to the response code This allows to see which commands were sent by the server mgcp: Terminate it with a new line [mgcp] Make number of endpoints static... For now this is fixed to the number of endpoints as of the GSM specification... [mgcp] The endpoint names seem to be base 16... use strtoul to parse Use strtoul to parse the base 16 number from the mgw string. [mgcp] Log the endpoints as hex numbers... [mgcp] Only send the RSIP on the first incoming message.. Remove call_agent option (also remove the number from the getopt call). [mgcp] Start couting at 1 for the mgcp [mgcp] Slight attempt to improve the grammar of the strings [mgcp] Share validation routines between DLCX and MDCX [mgcp] Remove help for dead config options [mgcp] Specify a different IN addr in the SDP records In case of NAT traversal be able to listen on a given interface (like 127.0.0.1) but claim to receive data at the beginning of the tunnel. [mgcp] Fix the static copy of the SDP file WIP verify out factoring broken.. [mgcp] Introduce VTY to the mgcp for config file parsing... Parse the MGCP config file via the VTY framework. [mgcp] Handle SDP parameters through VTY.. Currently the payload type, name and rate can be specified in the config file. [mgcp] Add an option to bind all rtp ports early This can be useful for testing and in deployment to make sure no runtime resource limit can be hit. [mgcp] Add some API doc comment [mgcp] Convert the packets of the example server to ascii This will allow to easily patch the call id... to run the server in a loop and make it work with the mediagateway [mgcp] Assign CI_UNUSED... to be more obvious... [mgcp] Use DEBUG and not DEBUGPC and specially not printf Improve the logging a bit in the mgcp [mgcp] Change the fake server to change the call id This assume the call-agent will just increment the id as well.... this is true for our implementation [mgcp] Generate the transaction id dynamically.. This way wireshark will be more happy about it... [mgcp] Recognize responses from the network.. This is just recognizing the response code and then is doing nothing with it. Also change the script to generate response messages... [mgcp] Improve debug messages for CRCX/MDCX.. Log on which ports the media gateway is listening and where the other (server) gateway is located
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#!/usr/bin/env python
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# Simple server for mgcp... send audit, receive response..
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import socket, time
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MGCP_GATEWAY_PORT = 2427
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MGCP_CALLAGENT_PORT = 2727
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rsip_resp = """200 321321332\r\n"""
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audit_packet = """AUEP %d 13@mgw MGCP 1.0\r\n"""
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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"""
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dlcx_packet = """DLCX %d 14@mgw MGCP 1.0\r\nC: 4a84ad5d25f\r\nI: %d\r\n"""
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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 172.16.1.107\r\ns=-\r\nc=IN IP4 172.16.1.107\r\nt=0 0\r\nm=audio 4400 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"""
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def hexdump(src, length=8):
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"""Recipe is from http://code.activestate.com/recipes/142812/"""
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result = []
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digits = 4 if isinstance(src, unicode) else 2
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for i in xrange(0, len(src), length):
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s = src[i:i+length]
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hexa = b' '.join(["%0*X" % (digits, ord(x)) for x in s])
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text = b''.join([x if 0x20 <= ord(x) < 0x7F else b'.' for x in s])
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result.append( b"%04X %-*s %s" % (i, length*(digits + 1), hexa, text) )
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return b'\n'.join(result)
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server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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server_socket.bind(("127.0.0.1", MGCP_CALLAGENT_PORT))
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server_socket.setblocking(0)
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def send_receive(packet):
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server_socket.sendto(packet, ("127.0.0.1", MGCP_GATEWAY_PORT))
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try:
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data, addr = server_socket.recvfrom(4096)
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print hexdump(data), addr
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except socket.error:
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pass
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def generate_tid():
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import random
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return random.randint(0, 65123)
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i = 1
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while True:
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send_receive(rsip_resp)
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send_receive(audit_packet)
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send_receive(crcx_packet % generate_tid() )
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send_receive(mdcx_packet % (generate_tid(), i))
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send_receive(dlcx_packet % (generate_tid(), i))
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i = i + 1
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time.sleep(3)
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/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
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/*
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009 by on-waves.com
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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unsigned int rtp_base_port = 4000;
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/**
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* Calculate the RTP audio port for the given multiplex
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* and the direction. This allows a semi static endpoint
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* to port calculation removing the need for the BSC
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* and the MediaGateway to communicate.
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*
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* Port usage explained:
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* base + (multiplex * 2) + 0 == local port to wait for network packets
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* base + (multiplex * 2) + 1 == local port for rtcp
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*
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* The above port will receive packets from the BTS that need
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* to be patched and forwarded to the network.
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* The above port will receive packets from the network that
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* need to be patched and forwarded to the BTS.
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*
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* We assume to have a static BTS IP address so we can differentiate
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* network and BTS.
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*
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*/
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int rtp_calculate_port(int multiplex, int base)
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{
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return base + (multiplex * 2);
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}
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@ -106,6 +106,7 @@ enum node_type {
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TRX_NODE,
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TS_NODE,
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SUBSCR_NODE,
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MGCP_NODE,
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};
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/* Node which has some commands and prompt string and configuration
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@ -1,7 +1,8 @@
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INCLUDES = $(all_includes) -I$(top_srcdir)/include
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AM_CFLAGS=-Wall
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sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config isdnsync
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sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config isdnsync \
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isdnsync bsc_mgcp
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noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libsccp.a
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noinst_HEADERS = vty/cardshell.h
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ipaccess_config_LDADD = libbsc.a libmsc.a libbsc.a libvty.a -ldl -ldbi $(LIBCRYPT)
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isdnsync_SOURCES = isdnsync.c
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bsc_mgcp_SOURCES = bsc_mgcp.c msgb.c talloc.c debug.c select.c timer.c
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bsc_mgcp_LDADD = libvty.a
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File diff suppressed because it is too large
Load Diff
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!
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! MGCP configuration hand edited
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! !
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password foo
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!
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line vty
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no login
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!
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mgcp
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local ip 172.23.23.23
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bts ip 192.168.100.100
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bind ip 0.0.0.0
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bind port 2427
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bind early 1
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rtp base 4000
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sdp audio payload number 97
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sdp audio payload name GSM-EFR/8000
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