[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
diff --git a/openbsc/contrib/mgcp_server.py b/openbsc/contrib/mgcp_server.py
new file mode 100755
index 0000000..cf3ef38
--- /dev/null
+++ b/openbsc/contrib/mgcp_server.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+# Simple server for mgcp... send audit, receive response..
+
+import socket, time
+
+MGCP_GATEWAY_PORT = 2427
+MGCP_CALLAGENT_PORT = 2727
+
+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 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"""
+
+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(("127.0.0.1", MGCP_CALLAGENT_PORT))
+server_socket.setblocking(0)
+
+
+def send_receive(packet):
+ server_socket.sendto(packet, ("127.0.0.1", MGCP_GATEWAY_PORT))
+ try:
+ data, addr = server_socket.recvfrom(4096)
+ print hexdump(data), addr
+ except socket.error:
+ pass
+
+def generate_tid():
+ import random
+ return random.randint(0, 65123)
+
+
+
+i = 1
+while True:
+ send_receive(rsip_resp)
+ send_receive(audit_packet)
+ send_receive(crcx_packet % generate_tid() )
+ send_receive(mdcx_packet % (generate_tid(), i))
+ send_receive(dlcx_packet % (generate_tid(), i))
+ i = i + 1
+
+ time.sleep(3)
diff --git a/openbsc/include/openbsc/mgcp.h b/openbsc/include/openbsc/mgcp.h
new file mode 100644
index 0000000..fa6224c
--- /dev/null
+++ b/openbsc/include/openbsc/mgcp.h
@@ -0,0 +1,48 @@
+/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
+
+/*
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009 by on-waves.com
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+unsigned int rtp_base_port = 4000;
+
+/**
+ * Calculate the RTP audio port for the given multiplex
+ * and the direction. This allows a semi static endpoint
+ * to port calculation removing the need for the BSC
+ * and the MediaGateway to communicate.
+ *
+ * Port usage explained:
+ * base + (multiplex * 2) + 0 == local port to wait for network packets
+ * base + (multiplex * 2) + 1 == local port for rtcp
+ *
+ * The above port will receive packets from the BTS that need
+ * to be patched and forwarded to the network.
+ * The above port will receive packets from the network that
+ * need to be patched and forwarded to the BTS.
+ *
+ * We assume to have a static BTS IP address so we can differentiate
+ * network and BTS.
+ *
+ */
+int rtp_calculate_port(int multiplex, int base)
+{
+ return base + (multiplex * 2);
+}
diff --git a/openbsc/include/vty/command.h b/openbsc/include/vty/command.h
index 9daa2d6..10a60ad 100644
--- a/openbsc/include/vty/command.h
+++ b/openbsc/include/vty/command.h
@@ -106,6 +106,7 @@
TRX_NODE,
TS_NODE,
SUBSCR_NODE,
+ MGCP_NODE,
};
/* Node which has some commands and prompt string and configuration
diff --git a/openbsc/src/Makefile.am b/openbsc/src/Makefile.am
index 7912008..7651132 100644
--- a/openbsc/src/Makefile.am
+++ b/openbsc/src/Makefile.am
@@ -1,7 +1,8 @@
INCLUDES = $(all_includes) -I$(top_srcdir)/include
AM_CFLAGS=-Wall
-sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config isdnsync
+sbin_PROGRAMS = bsc_hack bs11_config ipaccess-find ipaccess-config isdnsync \
+ isdnsync bsc_mgcp
noinst_LIBRARIES = libbsc.a libmsc.a libvty.a libsccp.a
noinst_HEADERS = vty/cardshell.h
@@ -32,3 +33,6 @@
ipaccess_config_LDADD = libbsc.a libmsc.a libbsc.a libvty.a -ldl -ldbi $(LIBCRYPT)
isdnsync_SOURCES = isdnsync.c
+
+bsc_mgcp_SOURCES = bsc_mgcp.c msgb.c talloc.c debug.c select.c timer.c
+bsc_mgcp_LDADD = libvty.a
diff --git a/openbsc/src/bsc_mgcp.c b/openbsc/src/bsc_mgcp.c
new file mode 100644
index 0000000..8b59b31
--- /dev/null
+++ b/openbsc/src/bsc_mgcp.c
@@ -0,0 +1,1117 @@
+/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */
+
+/*
+ * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009 by on-waves.com
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+#include <openbsc/debug.h>
+#include <openbsc/msgb.h>
+#include <openbsc/talloc.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/select.h>
+#include <openbsc/mgcp.h>
+
+#include <vty/command.h>
+#include <vty/vty.h>
+
+/* this is here for the vty... it will never be called */
+void subscr_put() { abort(); }
+void vty_event() { }
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+#warning "Make use of the rtp proxy code"
+
+static int source_port = 2427;
+static const char *local_ip = NULL;
+static const char *source_addr = "0.0.0.0";
+static struct bsc_fd bfd;
+static const unsigned int number_endpoints = 32 + 1;
+static const char *bts_ip = NULL;
+static struct in_addr bts_in;
+static int first_request = 1;
+static const char *audio_name = "GSM-EFR/8000";
+static int audio_payload = 97;
+static int early_bind = 0;
+
+static char *config_file = "mgcp.cfg";
+
+/* used by msgb and mgcp */
+void *tall_bsc_ctx = NULL;
+
+enum mgcp_connection_mode {
+ MGCP_CONN_NONE = 0,
+ MGCP_CONN_RECV_ONLY = 1,
+ MGCP_CONN_SEND_ONLY = 2,
+ MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
+};
+
+#define CI_UNUSED 0
+static unsigned int last_call_id = 0;
+
+struct mgcp_endpoint {
+ int ci;
+ char *callid;
+ char *local_options;
+ int conn_mode;
+
+ /* the local rtp port */
+ int rtp_port;
+
+ /*
+ * RTP mangling:
+ * - we get RTP and RTCP to us and need to forward to the BTS
+ * - we get RTP and RTCP from the BTS and forward to the network
+ */
+ struct bsc_fd local_rtp;
+ struct bsc_fd local_rtcp;
+
+ struct in_addr remote;
+
+ /* in network byte order */
+ int rtp, rtcp;
+ int bts_rtp, bts_rtcp;
+};
+
+static struct mgcp_endpoint *endpoints = NULL;
+#define ENDPOINT_NUMBER(endp) abs(endp - endpoints)
+
+/**
+ * Macro for tokenizing MGCP messages and SDP in one go.
+ *
+ */
+#define MSG_TOKENIZE_START \
+ line_start = 0; \
+ for (i = 0; i < msgb_l3len(msg); ++i) { \
+ /* we have a line end */ \
+ if (msg->l3h[i] == '\n') { \
+ /* skip the first line */ \
+ if (line_start == 0) { \
+ line_start = i + 1; \
+ continue; \
+ } \
+ \
+ /* check if we have a proper param */ \
+ if (i - line_start == 1 && msg->l3h[line_start] == '\r') { \
+ } else if (i - line_start > 2 \
+ && islower(msg->l3h[line_start]) \
+ && msg->l3h[line_start + 1] == '=') { \
+ } else if (i - line_start < 3 \
+ || msg->l3h[line_start + 1] != ':' \
+ || msg->l3h[line_start + 2] != ' ') \
+ goto error; \
+ \
+ msg->l3h[i] = '\0'; \
+ if (msg->l3h[i-1] == '\r') \
+ msg->l3h[i-1] = '\0';
+
+#define MSG_TOKENIZE_END \
+ line_start = i + 1; \
+ } \
+ }
+
+
+struct mgcp_msg_ptr {
+ unsigned int start;
+ unsigned int length;
+};
+
+struct mgcp_request {
+ char *name;
+ void (*handle_request) (struct msgb *msg, struct sockaddr_in *source);
+ char *debug_name;
+};
+
+#define MGCP_REQUEST(NAME, REQ, DEBUG_NAME) \
+ { .name = NAME, .handle_request = REQ, .debug_name = DEBUG_NAME },
+
+static void handle_audit_endpoint(struct msgb *msg, struct sockaddr_in *source);
+static void handle_create_con(struct msgb *msg, struct sockaddr_in *source);
+static void handle_delete_con(struct msgb *msg, struct sockaddr_in *source);
+static void handle_modify_con(struct msgb *msg, struct sockaddr_in *source);
+
+static int generate_call_id()
+{
+ int i;
+
+ /* use the call id */
+ ++last_call_id;
+
+ /* handle wrap around */
+ if (last_call_id == CI_UNUSED)
+ ++last_call_id;
+
+ /* callstack can only be of size number_of_endpoints */
+ /* verify that the call id is free, e.g. in case of overrun */
+ for (i = 1; i < number_endpoints; ++i)
+ if (endpoints[i].ci == last_call_id)
+ return generate_call_id();
+
+ return last_call_id;
+}
+
+/* FIXIME/TODO: need to have a list of pending transactions and check that */
+static unsigned int generate_transaction_id()
+{
+ return abs(rand());
+}
+
+static int _send(int fd, struct in_addr *addr, int port, char *buf, int len)
+{
+ struct sockaddr_in out;
+ out.sin_family = AF_INET;
+ out.sin_port = port;
+ memcpy(&out.sin_addr, addr, sizeof(*addr));
+
+ return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out));
+}
+
+/*
+ * There is data coming. We will have to figure out if it
+ * came from the BTS or the MediaGateway of the MSC. On top
+ * of that we need to figure out if it was RTP or RTCP.
+ *
+ * Currently we do not communicate with the BSC so we have
+ * no idea where the BTS is listening for RTP and need to
+ * do the classic routing trick. Wait for the first packet
+ * from the BTS and then go ahead.
+ */
+static int rtp_data_cb(struct bsc_fd *fd, unsigned int what)
+{
+ char buf[4096];
+ struct sockaddr_in addr;
+ socklen_t slen = sizeof(addr);
+ struct mgcp_endpoint *endp;
+ int rc, is_remote;
+
+ endp = (struct mgcp_endpoint *) fd->data;
+
+ rc = recvfrom(fd->fd, &buf, sizeof(buf), 0,
+ (struct sockaddr *) &addr, &slen);
+ if (rc < 0) {
+ DEBUGP(DMGCP, "Failed to receive message on: 0x%x\n",
+ ENDPOINT_NUMBER(endp));
+ return -1;
+ }
+
+ /*
+ * Figure out where to forward it to. This code assumes that we
+ * have received the Connection Modify and know who is a legitimate
+ * partner. According to the spec we could attempt to forward even
+ * after the Create Connection but we will not as we are not really
+ * able to tell if this is legitimate.
+ */
+ #warning "Slight spec violation. With connection mode recvonly we should attempt to forward."
+ is_remote = memcmp(&addr.sin_addr, &endp->remote, sizeof(addr.sin_addr)) == 0;
+ if (is_remote) {
+ if (endp->rtp == addr.sin_port) {
+ return _send(fd->fd, &bts_in, endp->bts_rtp, buf, rc);
+ } else if (endp->rtcp == addr.sin_port) {
+ return _send(fd->fd, &bts_in, endp->bts_rtcp, buf, rc);
+ } else {
+ DEBUGP(DMGCP, "Unknown remote port. Not able to forward on 0x%x port: %d\n",
+ ENDPOINT_NUMBER(endp), ntohs(addr.sin_port));
+ }
+
+ return -1;
+ }
+
+ /* We have no idea who called us, maybe it is the BTS. */
+ if (endp->bts_rtp == 0) {
+ /* it was the BTS... */
+ if (memcmp(&addr.sin_addr, &bts_in, sizeof(bts_in)) == 0) {
+ if (fd == &endp->local_rtp) {
+ endp->bts_rtp = addr.sin_port;
+ endp->bts_rtcp = htons(ntohs(addr.sin_port) + 1);
+ } else {
+ endp->bts_rtp = htons(ntohs(addr.sin_port) - 1);
+ endp->bts_rtcp = addr.sin_port;
+ }
+
+ DEBUGP(DMGCP, "Found BTS for endpoint: 0x%x on port: %d\n",
+ ENDPOINT_NUMBER(endp), ntohs(endp->bts_rtp));
+ }
+ }
+
+ if (endp->bts_rtp == 0 || endp->conn_mode == MGCP_CONN_RECV_ONLY) {
+ DEBUGP(DMGCP, "Not forwarding data from possible BTS conn: %d on 0x%x\n",
+ endp->conn_mode, ENDPOINT_NUMBER(endp));
+ return -1;
+ }
+
+ if (fd == &endp->local_rtp) {
+ return _send(fd->fd, &endp->remote, endp->rtp, buf, rc);
+ } else {
+ return _send(fd->fd, &endp->remote, endp->rtcp, buf, rc);
+ }
+}
+
+static int create_bind(struct bsc_fd *fd, int port)
+{
+ struct sockaddr_in addr;
+ int on = 1;
+
+ fd->fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd->fd < 0)
+ return -1;
+
+ setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(port);
+ inet_aton(source_addr, &addr.sin_addr);
+
+ if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int bind_rtp(struct mgcp_endpoint *endp)
+{
+ /* set to zero until we get the info */
+ memset(&endp->remote, 0, sizeof(endp->remote));
+ endp->bts_rtp = endp->bts_rtcp = 0;
+ endp->rtp = endp->rtcp = 0;
+
+ if (create_bind(&endp->local_rtp, endp->rtp_port) != 0) {
+ DEBUGP(DMGCP, "Failed to create RTP port: %d on 0x%x\n",
+ endp->rtp_port, ENDPOINT_NUMBER(endp));
+ goto cleanup0;
+ }
+
+ if (create_bind(&endp->local_rtcp, endp->rtp_port + 1) != 0) {
+ DEBUGP(DMGCP, "Failed to create RTCP port: %d on 0x%x\n",
+ endp->rtp_port + 1, ENDPOINT_NUMBER(endp));
+ goto cleanup1;
+ }
+
+ endp->local_rtp.cb = rtp_data_cb;
+ endp->local_rtp.data = endp;
+ endp->local_rtp.when = BSC_FD_READ;
+ if (bsc_register_fd(&endp->local_rtp) != 0) {
+ DEBUGP(DMGCP, "Failed to register RTP port %d on 0x%x\n",
+ endp->rtp_port, ENDPOINT_NUMBER(endp));
+ goto cleanup2;
+ }
+
+ endp->local_rtcp.cb = rtp_data_cb;
+ endp->local_rtcp.data = endp;
+ endp->local_rtcp.when = BSC_FD_READ;
+ if (bsc_register_fd(&endp->local_rtcp) != 0) {
+ DEBUGP(DMGCP, "Failed to register RTCP port %d on 0x%x\n",
+ endp->rtp_port + 1, ENDPOINT_NUMBER(endp));
+ goto cleanup3;
+ }
+
+ return 0;
+
+cleanup3:
+ bsc_unregister_fd(&endp->local_rtp);
+cleanup2:
+ close(endp->local_rtcp.fd);
+ endp->local_rtcp.fd = -1;
+cleanup1:
+ close(endp->local_rtp.fd);
+ endp->local_rtp.fd = -1;
+cleanup0:
+ return -1;
+}
+
+/*
+ * array of function pointers for handling various
+ * messages. In the future this might be binary sorted
+ * for performance reasons.
+ */
+static const struct mgcp_request mgcp_requests [] = {
+ MGCP_REQUEST("AUEP", handle_audit_endpoint, "AuditEndpoint")
+ MGCP_REQUEST("CRCX", handle_create_con, "CreateConnection")
+ MGCP_REQUEST("DLCX", handle_delete_con, "DeleteConnection")
+ MGCP_REQUEST("MDCX", handle_modify_con, "ModifiyConnection")
+};
+
+static void send_response_with_data(int code, const char *msg, const char *trans,
+ const char *data, struct sockaddr_in *source)
+{
+ char buf[4096];
+ int len;
+
+ if (data) {
+ len = snprintf(buf, sizeof(buf), "%d %s\n%s", code, trans, data);
+ } else {
+ len = snprintf(buf, sizeof(buf), "%d %s\n", code, trans);
+ }
+ DEBUGP(DMGCP, "Sending response: code: %d for '%s'\n", code, msg);
+
+ sendto(bfd.fd, buf, len, 0, (struct sockaddr *)source, sizeof(*source));
+}
+
+static void send_response(int code, const char *msg, const char *trans, struct sockaddr_in *source)
+{
+ send_response_with_data(code, msg, trans, NULL, source);
+}
+
+static void send_with_sdp(struct mgcp_endpoint *endp, const char *msg, const char *trans_id, struct sockaddr_in *source)
+{
+ const char *addr = local_ip;
+ char sdp_record[4096];
+
+ if (!addr)
+ addr = source_addr;
+
+ snprintf(sdp_record, sizeof(sdp_record) - 1,
+ "I: %d\n\n"
+ "v=0\r\n"
+ "c=IN IP4 %s\r\n"
+ "m=audio %d RTP/AVP %d\r\n"
+ "a=rtpmap:%d %s\r\n",
+ endp->ci, addr, endp->rtp_port,
+ audio_payload, audio_payload, audio_name);
+ return send_response_with_data(200, msg, trans_id, sdp_record, source);
+}
+
+/* send a static record */
+static void send_rsip(struct sockaddr_in *source)
+{
+ char reset[4096];
+ int len, rc;
+
+ len = snprintf(reset, sizeof(reset) - 1,
+ "RSIP %u *@mgw MGCP 1.0\n"
+ "RM: restart\n", generate_transaction_id());
+ rc = sendto(bfd.fd, reset, len, 0, (struct sockaddr *) source, sizeof(*source));
+ if (rc < 0) {
+ DEBUGP(DMGCP, "Failed to send RSIP: %d\n", rc);
+ }
+}
+
+/*
+ * handle incoming messages:
+ * - this can be a command (four letters, space, transaction id)
+ * - or a response (three numbers, space, transaction id)
+ */
+static void handle_message(struct msgb *msg, struct sockaddr_in *source)
+{
+ int code;
+
+ if (msg->len < 4) {
+ DEBUGP(DMGCP, "mgs too short: %d\n", msg->len);
+ return;
+ }
+
+ /* attempt to treat it as a response */
+ if (sscanf((const char *)&msg->data[0], "%3d %*s", &code) == 1) {
+ DEBUGP(DMGCP, "Response: Code: %d\n", code);
+ } else {
+ int i, handled = 0;
+ msg->l3h = &msg->l2h[4];
+ for (i = 0; i < ARRAY_SIZE(mgcp_requests); ++i)
+ if (strncmp(mgcp_requests[i].name, (const char *) &msg->data[0], 4) == 0) {
+ handled = 1;
+ mgcp_requests[i].handle_request(msg, source);
+ }
+ if (!handled) {
+ DEBUGP(DMGCP, "MSG with type: '%.4s' not handled\n", &msg->data[0]);
+ }
+ }
+}
+
+/* string tokenizer for the poor */
+static int find_msg_pointers(struct msgb *msg, struct mgcp_msg_ptr *ptrs, int ptrs_length)
+{
+ int i, found = 0;
+
+ int whitespace = 1;
+ for (i = 0; i < msgb_l3len(msg) && ptrs_length > 0; ++i) {
+ /* if we have a space we found an end */
+ if (msg->l3h[i] == ' ' || msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
+ if (!whitespace) {
+ ++found;
+ whitespace = 1;
+ ptrs->length = i - ptrs->start - 1;
+ ++ptrs;
+ --ptrs_length;
+ } else {
+ /* skip any number of whitespace */
+ }
+
+ /* line end... stop */
+ if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n')
+ break;
+ } else if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
+ /* line end, be done */
+ break;
+ } else if (whitespace) {
+ whitespace = 0;
+ ptrs->start = i;
+ }
+ }
+
+ if (ptrs_length == 0)
+ return -1;
+ return found;
+}
+
+static struct mgcp_endpoint *find_endpoint(const char *mgcp)
+{
+ char *endptr = NULL;
+ unsigned int gw = INT_MAX;
+
+ gw = strtoul(mgcp, &endptr, 16);
+ if (gw == 0 || gw >= number_endpoints || strcmp(endptr, "@mgw") != 0) {
+ DEBUGP(DMGCP, "Not able to find endpoint: '%s'\n", mgcp);
+ return NULL;
+ }
+
+ return &endpoints[gw];
+}
+
+static int analyze_header(struct msgb *msg, struct mgcp_msg_ptr *ptr, int size,
+ const char **transaction_id, struct mgcp_endpoint **endp)
+{
+ int found;
+
+ if (size < 3) {
+ DEBUGP(DMGCP, "Not enough space in ptr\n");
+ return -1;
+ }
+
+ found = find_msg_pointers(msg, ptr, size);
+
+ if (found < 3) {
+ DEBUGP(DMGCP, "Gateway: Not enough params. Found: %d\n", found);
+ return -1;
+ }
+
+ /*
+ * replace the space with \0. the main method gurantess that
+ * we still have + 1 for null termination
+ */
+ msg->l3h[ptr[3].start + ptr[3].length + 1] = '\0';
+ msg->l3h[ptr[2].start + ptr[2].length + 1] = '\0';
+ msg->l3h[ptr[1].start + ptr[1].length + 1] = '\0';
+ msg->l3h[ptr[0].start + ptr[0].length + 1] = '\0';
+
+ if (strncmp("1.0", (const char *)&msg->l3h[ptr[3].start], 3) != 0
+ || strncmp("MGCP", (const char *)&msg->l3h[ptr[2].start], 4) != 0) {
+ DEBUGP(DMGCP, "Wrong MGCP version. Not handling: '%s' '%s'\n",
+ (const char *)&msg->l3h[ptr[3].start],
+ (const char *)&msg->l3h[ptr[2].start]);
+ return -1;
+ }
+
+ *transaction_id = (const char *)&msg->l3h[ptr[0].start];
+ *endp = find_endpoint((const char *)&msg->l3h[ptr[1].start]);
+ return *endp == NULL;
+}
+
+static int verify_call_id(const struct mgcp_endpoint *endp,
+ const char *callid)
+{
+ if (strcmp(endp->callid, callid) != 0) {
+ DEBUGP(DMGCP, "CallIDs does not match on 0x%x. '%s' != '%s'\n",
+ ENDPOINT_NUMBER(endp), endp->callid, callid);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int verify_ci(const struct mgcp_endpoint *endp,
+ const char *ci)
+{
+ if (atoi(ci) != endp->ci) {
+ DEBUGP(DMGCP, "ConnectionIdentifiers do not match on 0x%x. %d != %s\n",
+ ENDPOINT_NUMBER(endp), endp->ci, ci);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void handle_audit_endpoint(struct msgb *msg, struct sockaddr_in *source)
+{
+ struct mgcp_msg_ptr data_ptrs[6];
+ int found, response;
+ const char *trans_id;
+ struct mgcp_endpoint *endp;
+
+ found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
+ if (found != 0)
+ response = 500;
+ else
+ response = 200;
+
+ return send_response(response, "AUEP", trans_id, source);
+}
+
+static int parse_conn_mode(const char* msg, int *conn_mode)
+{
+ int ret = 0;
+ if (strcmp(msg, "recvonly") == 0)
+ *conn_mode = MGCP_CONN_RECV_ONLY;
+ else if (strcmp(msg, "sendrecv") == 0)
+ *conn_mode = MGCP_CONN_RECV_SEND;
+ else {
+ DEBUGP(DMGCP, "Unknown connection mode: '%s'\n", msg);
+ ret = -1;
+ }
+
+ return ret;
+}
+
+static void handle_create_con(struct msgb *msg, struct sockaddr_in *source)
+{
+ struct mgcp_msg_ptr data_ptrs[6];
+ int found, i, line_start;
+ const char *trans_id;
+ struct mgcp_endpoint *endp;
+ int error_code = 500;
+
+ found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
+ if (found != 0)
+ return send_response(500, "CRCX", trans_id, source);
+
+ if (endp->ci != CI_UNUSED) {
+ DEBUGP(DMGCP, "Endpoint is already used. 0x%x\n", ENDPOINT_NUMBER(endp));
+ return send_response(500, "CRCX", trans_id, source);
+ }
+
+ /* parse CallID C: and LocalParameters L: */
+ MSG_TOKENIZE_START
+ switch (msg->l3h[line_start]) {
+ case 'L':
+ endp->local_options = talloc_strdup(endpoints,
+ (const char *)&msg->l3h[line_start + 3]);
+ break;
+ case 'C':
+ endp->callid = talloc_strdup(endpoints,
+ (const char *)&msg->l3h[line_start + 3]);
+ break;
+ case 'M':
+ if (parse_conn_mode((const char *)&msg->l3h[line_start + 3],
+ &endp->conn_mode) != 0) {
+ error_code = 517;
+ goto error2;
+ }
+ break;
+ default:
+ DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n",
+ msg->l3h[line_start], msg->l3h[line_start],
+ ENDPOINT_NUMBER(endp));
+ break;
+ }
+ MSG_TOKENIZE_END
+
+
+ /* bind to the port now */
+ endp->rtp_port = rtp_calculate_port(ENDPOINT_NUMBER(endp), rtp_base_port);
+ if (!early_bind && bind_rtp(endp) != 0)
+ goto error2;
+
+ /* assign a local call identifier or fail */
+ endp->ci = generate_call_id();
+ if (endp->ci == CI_UNUSED)
+ goto error2;
+
+ DEBUGP(DMGCP, "Creating endpoint on: 0x%x CI: %u port: %u\n",
+ ENDPOINT_NUMBER(endp), endp->ci, endp->rtp_port);
+ return send_with_sdp(endp, "CRCX", trans_id, source);
+error:
+ DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
+ hexdump(msg->l3h, msgb_l3len(msg)),
+ ENDPOINT_NUMBER(endp), line_start, i);
+ return send_response(error_code, "CRCX", trans_id, source);
+
+error2:
+ DEBUGP(DMGCP, "Resource error on 0x%x\n", ENDPOINT_NUMBER(endp));
+ return send_response(error_code, "CRCX", trans_id, source);
+}
+
+static void handle_modify_con(struct msgb *msg, struct sockaddr_in *source)
+{
+ struct mgcp_msg_ptr data_ptrs[6];
+ int found, i, line_start;
+ const char *trans_id;
+ struct mgcp_endpoint *endp;
+ int error_code = 500;
+
+ found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
+ if (found != 0)
+ return send_response(error_code, "MDCX", trans_id, source);
+
+ if (endp->ci == CI_UNUSED) {
+ DEBUGP(DMGCP, "Endpoint is not holding a connection. 0x%x\n", ENDPOINT_NUMBER(endp));
+ return send_response(error_code, "MDCX", trans_id, source);
+ }
+
+ MSG_TOKENIZE_START
+ switch (msg->l3h[line_start]) {
+ case 'C': {
+ if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
+ goto error3;
+ break;
+ }
+ case 'I': {
+ if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
+ goto error3;
+ break;
+ }
+ case 'L':
+ /* skip */
+ break;
+ case 'M':
+ if (parse_conn_mode((const char *)&msg->l3h[line_start + 3],
+ &endp->conn_mode) != 0) {
+ error_code = 517;
+ goto error3;
+ }
+ break;
+ case '\0':
+ /* SDP file begins */
+ break;
+ case 'a':
+ case 'o':
+ case 's':
+ case 't':
+ case 'v':
+ /* skip these SDP attributes */
+ break;
+ case 'm': {
+ int port;
+ const char *param = (const char *)&msg->l3h[line_start];
+
+ if (sscanf(param, "m=audio %d RTP/AVP %*d", &port) == 1) {
+ endp->rtp = htons(port);
+ endp->rtcp = htons(port + 1);
+ }
+ break;
+ }
+ case 'c': {
+ char ipv4[16];
+ const char *param = (const char *)&msg->l3h[line_start];
+
+ if (sscanf(param, "c=IN IP4 %15s", ipv4) == 1) {
+ inet_aton(ipv4, &endp->remote);
+ }
+ break;
+ }
+ default:
+ DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n",
+ msg->l3h[line_start], msg->l3h[line_start],
+ ENDPOINT_NUMBER(endp));
+ break;
+ }
+ MSG_TOKENIZE_END
+
+ /* modify */
+ DEBUGP(DMGCP, "Modified endpoint on: 0x%x Server: %s:%u\n",
+ ENDPOINT_NUMBER(endp), inet_ntoa(endp->remote), endp->rtp);
+ return send_with_sdp(endp, "MDCX", trans_id, source);
+
+error:
+ DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d %d\n",
+ hexdump(msg->l3h, msgb_l3len(msg)),
+ ENDPOINT_NUMBER(endp), line_start, i, msg->l3h[line_start]);
+ return send_response(error_code, "MDCX", trans_id, source);
+
+error3:
+ return send_response(error_code, "MDCX", trans_id, source);
+}
+
+static void handle_delete_con(struct msgb *msg, struct sockaddr_in *source)
+{
+ struct mgcp_msg_ptr data_ptrs[6];
+ int found, i, line_start;
+ const char *trans_id;
+ struct mgcp_endpoint *endp;
+ int error_code = 500;
+
+ found = analyze_header(msg, data_ptrs, ARRAY_SIZE(data_ptrs), &trans_id, &endp);
+ if (found != 0)
+ return send_response(error_code, "DLCX", trans_id, source);
+
+ if (endp->ci == CI_UNUSED) {
+ DEBUGP(DMGCP, "Endpoint is not used. 0x%x\n", ENDPOINT_NUMBER(endp));
+ return send_response(error_code, "DLCX", trans_id, source);
+ }
+
+ MSG_TOKENIZE_START
+ switch (msg->l3h[line_start]) {
+ case 'C': {
+ if (verify_call_id(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
+ goto error3;
+ break;
+ }
+ case 'I': {
+ if (verify_ci(endp, (const char *)&msg->l3h[line_start + 3]) != 0)
+ goto error3;
+ break;
+ }
+ default:
+ DEBUGP(DMGCP, "Unhandled option: '%c'/%d on 0x%x\n",
+ msg->l3h[line_start], msg->l3h[line_start],
+ ENDPOINT_NUMBER(endp));
+ break;
+ }
+ MSG_TOKENIZE_END
+
+
+ /* free the connection */
+ DEBUGP(DMGCP, "Deleting endpoint on: 0x%x\n", ENDPOINT_NUMBER(endp));
+ endp->ci= CI_UNUSED;
+ talloc_free(endp->callid);
+ talloc_free(endp->local_options);
+
+ if (!early_bind) {
+ bsc_unregister_fd(&endp->local_rtp);
+ bsc_unregister_fd(&endp->local_rtcp);
+ }
+
+ return send_response(250, "DLCX", trans_id, source);
+
+error:
+ DEBUGP(DMGCP, "Malformed line: %s on 0x%x with: line_start: %d %d\n",
+ hexdump(msg->l3h, msgb_l3len(msg)),
+ ENDPOINT_NUMBER(endp), line_start, i);
+ return send_response(error_code, "DLCX", trans_id, source);
+
+error3:
+ return send_response(error_code, "DLCX", trans_id, source);
+}
+
+static void print_help()
+{
+ printf("Some useful help...\n");
+ printf(" -h --help is printing this text.\n");
+ printf(" -c --config-file filename The config file to use.\n");
+}
+
+static void handle_options(int argc, char** argv)
+{
+ while (1) {
+ int option_index = 0, c;
+ static struct option long_options[] = {
+ {"help", 0, 0, 'h'},
+ {"config-file", 1, 0, 'c'},
+ {0, 0, 0, 0},
+ };
+
+ c = getopt_long(argc, argv, "hc:", long_options, &option_index);
+
+ if (c == -1)
+ break;
+
+ switch(c) {
+ case 'h':
+ print_help();
+ exit(0);
+ break;
+ case 'c':
+ config_file = talloc_strdup(tall_bsc_ctx, optarg);
+ break;
+ default:
+ /* ignore */
+ break;
+ };
+ }
+}
+
+static int read_call_agent(struct bsc_fd *fd, unsigned int what)
+{
+ struct sockaddr_in addr;
+ socklen_t slen = sizeof(addr);
+ struct msgb *msg;
+
+ msg = (struct msgb *) fd->data;
+
+ /* read one less so we can use it as a \0 */
+ int rc = recvfrom(bfd.fd, msg->data, msg->data_len - 1, 0,
+ (struct sockaddr *) &addr, &slen);
+ if (rc < 0) {
+ perror("Gateway failed to read");
+ return -1;
+ } else if (slen > sizeof(addr)) {
+ fprintf(stderr, "Gateway received message from outerspace: %d %d\n",
+ slen, sizeof(addr));
+ return -1;
+ }
+
+ if (first_request) {
+ first_request = 0;
+ send_rsip(&addr);
+ return 0;
+ }
+
+ /* handle message now */
+ msg->l2h = msgb_put(msg, rc);
+ handle_message(msg, &addr);
+ msgb_reset(msg);
+ return 0;
+}
+
+/*
+ * vty code for mgcp below
+ */
+struct cmd_node mgcp_node = {
+ MGCP_NODE,
+ "%s(mgcp)#",
+ 1,
+};
+
+static int config_write_mgcp(struct vty *vty)
+{
+ vty_out(vty, "mgcp%s", VTY_NEWLINE);
+ if (local_ip)
+ vty_out(vty, " local ip %s%s", local_ip, VTY_NEWLINE);
+ vty_out(vty, " bts ip %s%s", bts_ip, VTY_NEWLINE);
+ vty_out(vty, " bind ip %s%s", source_addr, VTY_NEWLINE);
+ vty_out(vty, " bind port %u%s", source_port, VTY_NEWLINE);
+ vty_out(vty, " rtp base %u%s", rtp_base_port, VTY_NEWLINE);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp,
+ cfg_mgcp_cmd,
+ "mgcp",
+ "Configure the MGCP")
+{
+ vty->node = MGCP_NODE;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_local_ip,
+ cfg_mgcp_local_ip_cmd,
+ "local ip IP",
+ "Set the IP to be used in SDP records")
+{
+ local_ip = talloc_strdup(tall_bsc_ctx, argv[0]);
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_bts_ip,
+ cfg_mgcp_bts_ip_cmd,
+ "bts ip IP",
+ "Set the IP of the BTS for RTP forwarding")
+{
+ bts_ip = talloc_strdup(tall_bsc_ctx, argv[0]);
+ inet_aton(bts_ip, &bts_in);
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_bind_ip,
+ cfg_mgcp_bind_ip_cmd,
+ "bind ip IP",
+ "Bind the MGCP to this local addr")
+{
+ source_addr = talloc_strdup(tall_bsc_ctx, argv[0]);
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_bind_port,
+ cfg_mgcp_bind_port_cmd,
+ "bind port <0-65534>",
+ "Bind the MGCP to this port")
+{
+ unsigned int port = atoi(argv[0]);
+ if (port > 65534) {
+ vty_out(vty, "%% wrong bind port '%s'%s", argv[0], VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ source_port = port;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_bind_early,
+ cfg_mgcp_bind_early_cmd,
+ "bind early (0|1)",
+ "Bind all RTP ports early")
+{
+ unsigned int bind = atoi(argv[0]);
+ if (bind != 0 && bind != 1) {
+ vty_out(vty, "%% param must be 0 or 1.%s", VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ early_bind = bind == 1;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_rtp_base_port,
+ cfg_mgcp_rtp_base_port_cmd,
+ "rtp base <0-65534>",
+ "Base port to use")
+{
+ unsigned int port = atoi(argv[0]);
+ if (port > 65534) {
+ vty_out(vty, "%% wrong base port '%s'%s", argv[0], VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ rtp_base_port = port;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_sdp_payload_number,
+ cfg_mgcp_sdp_payload_number_cmd,
+ "sdp audio payload number <1-255>",
+ "Set the audio codec to use")
+{
+ unsigned int payload = atoi(argv[0]);
+ if (payload > 255) {
+ vty_out(vty, "%% wrong payload number '%s'%s", argv[0], VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ audio_payload = payload;
+ return CMD_SUCCESS;
+}
+
+DEFUN(cfg_mgcp_sdp_payload_name,
+ cfg_mgcp_sdp_payload_name_cmd,
+ "sdp audio payload name NAME",
+ "Set the audio name to use")
+{
+ audio_name = talloc_strdup(tall_bsc_ctx, argv[0]);
+ return CMD_SUCCESS;
+}
+
+static void mgcp_vty_init()
+{
+ cmd_init(1);
+ vty_init();
+
+ install_element(CONFIG_NODE, &cfg_mgcp_cmd);
+ install_node(&mgcp_node, config_write_mgcp);
+ install_default(MGCP_NODE);
+ install_element(MGCP_NODE, &cfg_mgcp_local_ip_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_bts_ip_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_bind_ip_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_bind_port_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_bind_early_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_rtp_base_port_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_sdp_payload_number_cmd);
+ install_element(MGCP_NODE, &cfg_mgcp_sdp_payload_name_cmd);
+}
+
+int main(int argc, char** argv)
+{
+ struct sockaddr_in addr;
+ int on = 1, i, rc;
+
+ tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
+ handle_options(argc, argv);
+
+ mgcp_vty_init();
+ rc = vty_read_config_file(config_file);
+ if (rc < 0) {
+ fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file);
+ return rc;
+ }
+
+
+ if (!bts_ip) {
+ fprintf(stderr, "Need to specify the BTS ip address for RTP handling.\n");
+ return -1;
+ }
+
+ endpoints = _talloc_zero_array(tall_bsc_ctx,
+ sizeof(struct mgcp_endpoint),
+ number_endpoints, "endpoints");
+ if (!endpoints) {
+ fprintf(stderr, "Failed to allocate endpoints: %d. Quitting.\n", number_endpoints);
+ return -1;
+ }
+
+ /* Initialize all endpoints */
+ for (i = 0; i < number_endpoints; ++i) {
+ endpoints[i].local_rtp.fd = -1;
+ endpoints[i].local_rtcp.fd = -1;
+ endpoints[i].ci = CI_UNUSED;
+ }
+
+ /* initialize the socket */
+ bfd.when = BSC_FD_READ;
+ bfd.cb = read_call_agent;
+ bfd.fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (bfd.fd < 0) {
+ perror("Gateway failed to listen");
+ return -1;
+ }
+
+ setsockopt(bfd.fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_port = htons(source_port);
+ inet_aton(source_addr, &addr.sin_addr);
+
+ if (bind(bfd.fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ perror("Gateway failed to bind");
+ return -1;
+ }
+
+ bfd.data = msgb_alloc(4096, "mgcp-msg");
+ if (!bfd.data) {
+ fprintf(stderr, "Gateway memory error.\n");
+ return -1;
+ }
+
+
+ if (bsc_register_fd(&bfd) != 0) {
+ DEBUGP(DMGCP, "Failed to register the fd\n");
+ return -1;
+ }
+
+ /* initialisation */
+ srand(time(NULL));
+
+ /* early bind */
+ if (early_bind) {
+ for (i = 1; i < number_endpoints; ++i) {
+ struct mgcp_endpoint *endp = &endpoints[i];
+ endp->rtp_port = rtp_calculate_port(ENDPOINT_NUMBER(endp), rtp_base_port);
+ if (bind_rtp(endp) != 0)
+ return -1;
+ }
+ }
+
+ /* main loop */
+ while (1) {
+ bsc_select_main(0);
+ }
+
+
+ return 0;
+}
diff --git a/openbsc/src/mgcp.cfg b/openbsc/src/mgcp.cfg
new file mode 100644
index 0000000..c4da051
--- /dev/null
+++ b/openbsc/src/mgcp.cfg
@@ -0,0 +1,17 @@
+!
+! MGCP configuration hand edited
+! !
+password foo
+!
+line vty
+ no login
+!
+mgcp
+ local ip 172.23.23.23
+ bts ip 192.168.100.100
+ bind ip 0.0.0.0
+ bind port 2427
+ bind early 1
+ rtp base 4000
+ sdp audio payload number 97
+ sdp audio payload name GSM-EFR/8000