1180 lines
30 KiB
C
1180 lines
30 KiB
C
/* 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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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <limits.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <openbsc/debug.h>
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#include <openbsc/msgb.h>
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#include <openbsc/talloc.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/select.h>
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#include <openbsc/mgcp.h>
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#include <openbsc/telnet_interface.h>
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#include <vty/command.h>
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#include <vty/vty.h>
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/* this is here for the vty... it will never be called */
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void subscr_put() { abort(); }
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#define _GNU_SOURCE
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#include <getopt.h>
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#warning "Make use of the rtp proxy code"
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static int source_port = 2427;
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static const char *local_ip = NULL;
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static const char *source_addr = "0.0.0.0";
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static struct bsc_fd bfd;
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static unsigned int number_endpoints = 0;
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static const char *bts_ip = NULL;
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static struct in_addr bts_in;
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static int first_request = 1;
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static const char *audio_name = "GSM-EFR/8000";
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static int audio_payload = 97;
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static int audio_loop = 0;
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static int early_bind = 0;
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static char *config_file = "mgcp.cfg";
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/* used by msgb and mgcp */
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void *tall_bsc_ctx = NULL;
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enum mgcp_connection_mode {
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MGCP_CONN_NONE = 0,
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MGCP_CONN_RECV_ONLY = 1,
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MGCP_CONN_SEND_ONLY = 2,
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MGCP_CONN_RECV_SEND = MGCP_CONN_RECV_ONLY | MGCP_CONN_SEND_ONLY,
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};
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enum {
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DEST_NETWORK = 0,
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DEST_BTS = 1,
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};
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enum {
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PROTO_RTP,
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PROTO_RTCP,
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};
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#define CI_UNUSED 0
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static unsigned int last_call_id = 0;
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struct mgcp_endpoint {
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int ci;
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char *callid;
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char *local_options;
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int conn_mode;
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/* the local rtp port */
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int rtp_port;
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/*
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* RTP mangling:
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* - we get RTP and RTCP to us and need to forward to the BTS
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* - we get RTP and RTCP from the BTS and forward to the network
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*/
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struct bsc_fd local_rtp;
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struct bsc_fd local_rtcp;
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struct in_addr remote;
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/* in network byte order */
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int rtp, rtcp;
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int bts_rtp, bts_rtcp;
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};
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static struct mgcp_endpoint *endpoints = NULL;
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#define ENDPOINT_NUMBER(endp) abs(endp - endpoints)
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/**
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* Macro for tokenizing MGCP messages and SDP in one go.
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*
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*/
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#define MSG_TOKENIZE_START \
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line_start = 0; \
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for (i = 0; i < msgb_l3len(msg); ++i) { \
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/* we have a line end */ \
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if (msg->l3h[i] == '\n') { \
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/* skip the first line */ \
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if (line_start == 0) { \
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line_start = i + 1; \
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continue; \
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} \
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\
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/* check if we have a proper param */ \
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if (i - line_start == 1 && msg->l3h[line_start] == '\r') { \
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} else if (i - line_start > 2 \
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&& islower(msg->l3h[line_start]) \
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&& msg->l3h[line_start + 1] == '=') { \
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} else if (i - line_start < 3 \
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|| msg->l3h[line_start + 1] != ':' \
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|| msg->l3h[line_start + 2] != ' ') \
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goto error; \
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\
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msg->l3h[i] = '\0'; \
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if (msg->l3h[i-1] == '\r') \
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msg->l3h[i-1] = '\0';
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#define MSG_TOKENIZE_END \
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line_start = i + 1; \
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} \
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}
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struct mgcp_msg_ptr {
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unsigned int start;
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unsigned int length;
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};
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struct mgcp_request {
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char *name;
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void (*handle_request) (struct msgb *msg, struct sockaddr_in *source);
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char *debug_name;
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};
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#define MGCP_REQUEST(NAME, REQ, DEBUG_NAME) \
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{ .name = NAME, .handle_request = REQ, .debug_name = DEBUG_NAME },
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static void handle_audit_endpoint(struct msgb *msg, struct sockaddr_in *source);
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static void handle_create_con(struct msgb *msg, struct sockaddr_in *source);
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static void handle_delete_con(struct msgb *msg, struct sockaddr_in *source);
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static void handle_modify_con(struct msgb *msg, struct sockaddr_in *source);
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static int generate_call_id()
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{
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int i;
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/* use the call id */
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++last_call_id;
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/* handle wrap around */
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if (last_call_id == CI_UNUSED)
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++last_call_id;
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/* callstack can only be of size number_of_endpoints */
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/* verify that the call id is free, e.g. in case of overrun */
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for (i = 1; i < number_endpoints; ++i)
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if (endpoints[i].ci == last_call_id)
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return generate_call_id();
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return last_call_id;
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}
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/* FIXIME/TODO: need to have a list of pending transactions and check that */
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static unsigned int generate_transaction_id()
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{
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return abs(rand());
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}
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static int _send(int fd, struct in_addr *addr, int port, char *buf, int len)
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{
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struct sockaddr_in out;
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out.sin_family = AF_INET;
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out.sin_port = port;
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memcpy(&out.sin_addr, addr, sizeof(*addr));
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return sendto(fd, buf, len, 0, (struct sockaddr *)&out, sizeof(out));
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}
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/*
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* There is data coming. We will have to figure out if it
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* came from the BTS or the MediaGateway of the MSC. On top
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* of that we need to figure out if it was RTP or RTCP.
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*
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* Currently we do not communicate with the BSC so we have
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* no idea where the BTS is listening for RTP and need to
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* do the classic routing trick. Wait for the first packet
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* from the BTS and then go ahead.
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*/
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static int rtp_data_cb(struct bsc_fd *fd, unsigned int what)
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{
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char buf[4096];
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struct sockaddr_in addr;
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socklen_t slen = sizeof(addr);
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struct mgcp_endpoint *endp;
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int rc, dest, proto;
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endp = (struct mgcp_endpoint *) fd->data;
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rc = recvfrom(fd->fd, &buf, sizeof(buf), 0,
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(struct sockaddr *) &addr, &slen);
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if (rc < 0) {
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DEBUGP(DMGCP, "Failed to receive message on: 0x%x\n",
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ENDPOINT_NUMBER(endp));
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return -1;
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}
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/* do not forward aynthing... maybe there is a packet from the bts */
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if (endp->ci == CI_UNUSED)
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return -1;
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/*
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* Figure out where to forward it to. This code assumes that we
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* have received the Connection Modify and know who is a legitimate
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* partner. According to the spec we could attempt to forward even
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* after the Create Connection but we will not as we are not really
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* able to tell if this is legitimate.
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*/
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#warning "Slight spec violation. With connection mode recvonly we should attempt to forward."
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dest = memcmp(&addr.sin_addr, &endp->remote, sizeof(addr.sin_addr)) == 0
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? DEST_BTS : DEST_NETWORK;
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proto = fd == &endp->local_rtp ? PROTO_RTP : PROTO_RTCP;
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/* We have no idea who called us, maybe it is the BTS. */
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if (dest == DEST_NETWORK && endp->bts_rtp == 0) {
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/* it was the BTS... */
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if (memcmp(&addr.sin_addr, &bts_in, sizeof(bts_in)) == 0) {
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if (fd == &endp->local_rtp) {
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endp->bts_rtp = addr.sin_port;
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} else {
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endp->bts_rtcp = addr.sin_port;
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}
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DEBUGP(DMGCP, "Found BTS for endpoint: 0x%x on port: %d/%d\n",
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ENDPOINT_NUMBER(endp), ntohs(endp->bts_rtp), ntohs(endp->bts_rtcp));
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}
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}
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/* dispatch */
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if (audio_loop)
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dest = !dest;
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if (dest == DEST_NETWORK) {
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return _send(fd->fd, &endp->remote,
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proto == PROTO_RTP ? endp->rtp : endp->rtcp,
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buf, rc);
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} else {
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return _send(fd->fd, &bts_in,
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proto == PROTO_RTP ? endp->bts_rtp : endp->bts_rtcp,
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buf, rc);
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}
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}
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static int create_bind(struct bsc_fd *fd, int port)
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{
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struct sockaddr_in addr;
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int on = 1;
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fd->fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd->fd < 0)
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return -1;
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setsockopt(fd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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inet_aton(source_addr, &addr.sin_addr);
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if (bind(fd->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
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return -1;
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return 0;
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}
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static int bind_rtp(struct mgcp_endpoint *endp)
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{
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/* set to zero until we get the info */
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memset(&endp->remote, 0, sizeof(endp->remote));
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if (create_bind(&endp->local_rtp, endp->rtp_port) != 0) {
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DEBUGP(DMGCP, "Failed to create RTP port: %d on 0x%x\n",
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endp->rtp_port, ENDPOINT_NUMBER(endp));
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goto cleanup0;
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}
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if (create_bind(&endp->local_rtcp, endp->rtp_port + 1) != 0) {
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DEBUGP(DMGCP, "Failed to create RTCP port: %d on 0x%x\n",
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endp->rtp_port + 1, ENDPOINT_NUMBER(endp));
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goto cleanup1;
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}
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endp->local_rtp.cb = rtp_data_cb;
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endp->local_rtp.data = endp;
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endp->local_rtp.when = BSC_FD_READ;
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if (bsc_register_fd(&endp->local_rtp) != 0) {
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DEBUGP(DMGCP, "Failed to register RTP port %d on 0x%x\n",
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endp->rtp_port, ENDPOINT_NUMBER(endp));
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goto cleanup2;
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}
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endp->local_rtcp.cb = rtp_data_cb;
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endp->local_rtcp.data = endp;
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endp->local_rtcp.when = BSC_FD_READ;
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if (bsc_register_fd(&endp->local_rtcp) != 0) {
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DEBUGP(DMGCP, "Failed to register RTCP port %d on 0x%x\n",
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endp->rtp_port + 1, ENDPOINT_NUMBER(endp));
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goto cleanup3;
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}
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return 0;
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cleanup3:
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bsc_unregister_fd(&endp->local_rtp);
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cleanup2:
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close(endp->local_rtcp.fd);
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endp->local_rtcp.fd = -1;
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cleanup1:
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close(endp->local_rtp.fd);
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endp->local_rtp.fd = -1;
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cleanup0:
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return -1;
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}
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/*
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* array of function pointers for handling various
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* messages. In the future this might be binary sorted
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* for performance reasons.
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*/
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static const struct mgcp_request mgcp_requests [] = {
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MGCP_REQUEST("AUEP", handle_audit_endpoint, "AuditEndpoint")
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MGCP_REQUEST("CRCX", handle_create_con, "CreateConnection")
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MGCP_REQUEST("DLCX", handle_delete_con, "DeleteConnection")
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MGCP_REQUEST("MDCX", handle_modify_con, "ModifiyConnection")
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};
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static void send_response_with_data(int code, const char *msg, const char *trans,
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const char *data, struct sockaddr_in *source)
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{
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char buf[4096];
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int len;
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if (data) {
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len = snprintf(buf, sizeof(buf), "%d %s\n%s", code, trans, data);
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} else {
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len = snprintf(buf, sizeof(buf), "%d %s\n", code, trans);
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}
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DEBUGP(DMGCP, "Sending response: code: %d for '%s'\n", code, msg);
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sendto(bfd.fd, buf, len, 0, (struct sockaddr *)source, sizeof(*source));
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}
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static void send_response(int code, const char *msg, const char *trans, struct sockaddr_in *source)
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{
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send_response_with_data(code, msg, trans, NULL, source);
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}
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static void send_with_sdp(struct mgcp_endpoint *endp, const char *msg, const char *trans_id, struct sockaddr_in *source)
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{
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const char *addr = local_ip;
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char sdp_record[4096];
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if (!addr)
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addr = source_addr;
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snprintf(sdp_record, sizeof(sdp_record) - 1,
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"I: %d\n\n"
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"v=0\r\n"
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"c=IN IP4 %s\r\n"
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"m=audio %d RTP/AVP %d\r\n"
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"a=rtpmap:%d %s\r\n",
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endp->ci, addr, endp->rtp_port,
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audio_payload, audio_payload, audio_name);
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return send_response_with_data(200, msg, trans_id, sdp_record, source);
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}
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/* send a static record */
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static void send_rsip(struct sockaddr_in *source)
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{
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char reset[4096];
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int len, rc;
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len = snprintf(reset, sizeof(reset) - 1,
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"RSIP %u *@mgw MGCP 1.0\n"
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"RM: restart\n", generate_transaction_id());
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rc = sendto(bfd.fd, reset, len, 0, (struct sockaddr *) source, sizeof(*source));
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if (rc < 0) {
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DEBUGP(DMGCP, "Failed to send RSIP: %d\n", rc);
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}
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}
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/*
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* handle incoming messages:
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* - this can be a command (four letters, space, transaction id)
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* - or a response (three numbers, space, transaction id)
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*/
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static void handle_message(struct msgb *msg, struct sockaddr_in *source)
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{
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int code;
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if (msg->len < 4) {
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DEBUGP(DMGCP, "mgs too short: %d\n", msg->len);
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return;
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}
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/* attempt to treat it as a response */
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if (sscanf((const char *)&msg->data[0], "%3d %*s", &code) == 1) {
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DEBUGP(DMGCP, "Response: Code: %d\n", code);
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} else {
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int i, handled = 0;
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msg->l3h = &msg->l2h[4];
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for (i = 0; i < ARRAY_SIZE(mgcp_requests); ++i)
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if (strncmp(mgcp_requests[i].name, (const char *) &msg->data[0], 4) == 0) {
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handled = 1;
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mgcp_requests[i].handle_request(msg, source);
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}
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if (!handled) {
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DEBUGP(DMGCP, "MSG with type: '%.4s' not handled\n", &msg->data[0]);
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}
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}
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}
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/* string tokenizer for the poor */
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static int find_msg_pointers(struct msgb *msg, struct mgcp_msg_ptr *ptrs, int ptrs_length)
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{
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int i, found = 0;
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int whitespace = 1;
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for (i = 0; i < msgb_l3len(msg) && ptrs_length > 0; ++i) {
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/* if we have a space we found an end */
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if (msg->l3h[i] == ' ' || msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
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if (!whitespace) {
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++found;
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whitespace = 1;
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ptrs->length = i - ptrs->start - 1;
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++ptrs;
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--ptrs_length;
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} else {
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/* skip any number of whitespace */
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}
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/* line end... stop */
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if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n')
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break;
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} else if (msg->l3h[i] == '\r' || msg->l3h[i] == '\n') {
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/* line end, be done */
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break;
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} else if (whitespace) {
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whitespace = 0;
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ptrs->start = i;
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}
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}
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if (ptrs_length == 0)
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return -1;
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return found;
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}
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static struct mgcp_endpoint *find_endpoint(const char *mgcp)
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{
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char *endptr = NULL;
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unsigned int gw = INT_MAX;
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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
|
|
|
|
/* initialize */
|
|
endp->rtp = endp->rtcp = endp->bts_rtp = endp->bts_rtcp = 0;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
endp->rtp = endp->rtcp = endp->bts_rtp = endp->bts_rtcp = 0;
|
|
|
|
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, " bind early %u%s", !!early_bind, VTY_NEWLINE);
|
|
vty_out(vty, " rtp base %u%s", rtp_base_port, VTY_NEWLINE);
|
|
vty_out(vty, " sdp audio payload number %u%s", audio_payload, VTY_NEWLINE);
|
|
vty_out(vty, " sdp audio payload name %s%s", audio_name, VTY_NEWLINE);
|
|
vty_out(vty, " loop %u%s", !!audio_loop, VTY_NEWLINE);
|
|
vty_out(vty, " endpoints %u%s", number_endpoints, VTY_NEWLINE);
|
|
|
|
return CMD_SUCCESS;
|
|
}
|
|
|
|
DEFUN(show_mcgp, show_mgcp_cmd, "show mgcp",
|
|
SHOW_STR "Display information about the MGCP Media Gateway")
|
|
{
|
|
int i;
|
|
|
|
vty_out(vty, "MGCP is up and running with %u endpoints:%s", number_endpoints - 1, VTY_NEWLINE);
|
|
for (i = 1; i < number_endpoints; ++i) {
|
|
struct mgcp_endpoint *endp = &endpoints[i];
|
|
vty_out(vty, " Endpoint 0x%.2x: CI: %d net: %u/%u bts: %u/%u%s",
|
|
i, endp->ci,
|
|
ntohs(endp->rtp), ntohs(endp->rtcp),
|
|
ntohs(endp->bts_rtp), ntohs(endp->bts_rtcp), 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;
|
|
}
|
|
|
|
DEFUN(cfg_mgcp_loop,
|
|
cfg_mgcp_loop_cmd,
|
|
"loop (0|1)",
|
|
"Loop the audio")
|
|
{
|
|
audio_loop = atoi(argv[0]);
|
|
return CMD_SUCCESS;
|
|
}
|
|
|
|
DEFUN(cfg_mgcp_number_endp,
|
|
cfg_mgcp_number_endp_cmd,
|
|
"number endpoints <0-65534>",
|
|
"The number of endpoints to allocate. This is not dynamic.")
|
|
{
|
|
/* + 1 as we start counting at one */
|
|
number_endpoints = atoi(argv[0]) + 1;
|
|
return CMD_SUCCESS;
|
|
}
|
|
|
|
int bsc_vty_init(struct gsm_network *dummy)
|
|
{
|
|
cmd_init(1);
|
|
vty_init();
|
|
|
|
install_element(VIEW_NODE, &show_mgcp_cmd);
|
|
|
|
|
|
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);
|
|
install_element(MGCP_NODE, &cfg_mgcp_loop_cmd);
|
|
install_element(MGCP_NODE, &cfg_mgcp_number_endp_cmd);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
struct gsm_network dummy_network;
|
|
struct sockaddr_in addr;
|
|
int on = 1, i, rc;
|
|
struct debug_target *stderr_target;
|
|
|
|
tall_bsc_ctx = talloc_named_const(NULL, 1, "mgcp-callagent");
|
|
|
|
debug_init();
|
|
stderr_target = debug_target_create_stderr();
|
|
debug_add_target(stderr_target);
|
|
debug_set_all_filter(stderr_target, 1);
|
|
|
|
handle_options(argc, argv);
|
|
|
|
telnet_init(&dummy_network, 4243);
|
|
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;
|
|
}
|