extcmd.c

用来作为linux中SIP SERVER,完成VOIP网络电话中服务器的功能

/*
 * $Id: extcmd.c,v 1.9 2004/08/24 08:58:29 janakj Exp $
 *
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    [e-mail]
 *
 * ser 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * -------
 * 2003-03-11: New module interface (janakj)
 * 2003-03-16: flags export parameter added (janakj)
 */


#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <errno.h>

#include "../../resolve.h"
#include "../../sr_module.h"
#include "../../error.h"
#include "../../dprint.h"
#include "../../ut.h"
#include "../../globals.h"
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"
#include "../../parser/parse_uri.h"
#include "../../data_lump_rpl.h"
#include "../tm/tm_load.h"
#include "extcmd_funcs.h"


#define append_str(_p,_s,_l) \
	{memcpy((_p),(_s),(_l));\
	(_p) += (_l);}


static int extcmd_init(void);
static int extcmd_child_init(int rank);



/* parameters */
char *my_address = 0;
int  my_port = 7890;

/* global variables */
struct tm_binds tmb;
int    server_sock;
int    rpl_pipe[2];
int    req_pipe[2];


/*
 * Exported functions
 */

static cmd_export_t cmds[] = {
	{"extcmd_dump_req", dump_request, 0, 0, REQUEST_ROUTE},
	{0, 0, 0, 0, 0}
};


/*
 * Exported parameters
 */
static param_export_t params[] = {
	{"listen_address", STR_PARAM, &my_address},
	{"listen_port",    INT_PARAM, &my_port   },
	{0, 0, 0}
};


struct module_exports exports= {
	"extcmd",
	cmds,                    /* Exported functions */
	params,                  /* Exported parameters */
	extcmd_init,             /* module initialization function */
	0,
	0,   /* module exit function */
	0,
	(child_init_function) extcmd_child_init  /* per-child init function */
};




static int extcmd_init(void)
{
	load_tm_f  load_tm;
	struct hostent* he;
	union sockaddr_union me;

	DBG("EXTCMD - initializing\n");

	/* import the TM auto-loading function */
	if ( !(load_tm=(load_tm_f)find_export("load_tm", NO_SCRIPT, 0))) {
		LOG(L_ERR, "ERROR: extcmd: global_init: cannot import load_tm\n");
		goto error;
	}
	/* let the auto-loading function load all TM stuff */
	if (load_tm( &tmb )==-1) 
		goto error;

	/* check the parameter */
	if ( !my_address) {
		LOG(L_ERR,"ERROR:extcmd_init: no address specified for listening!!\n");
		goto error;
	}

	/* build a sockaddr_union for the listen socket */
	he = resolvehost(my_address);
	if (!he) {
		LOG(L_ERR,"ERROR:extcmd_init: cannot solve \"%s\"!!\n",my_address);
		goto error;
	}
	if (hostent2su( &me, he, 0, my_port)==-1)
		goto error;

	/* create the socket server */
	server_sock = socket( he->h_addrtype, SOCK_STREAM, 0);
	if (server_sock<0) {
		LOG(L_ERR,"ERROR:extcmd_init: cannot create server socket! %s\n",
			strerror(errno));
		goto error;
	}

	/* bind the socket! */
	if (bind( server_sock, (struct sockaddr*)&me, sizeof(me) )==-1) {
		LOG(L_ERR,"ERROR:extcmd_init: cannot bind to %s:%d! Reason=%s\n",
			my_address, my_port, strerror(errno) );
		goto error;
	}

	/* now, let's create the pipes for rpl and req */
	if ( pipe(rpl_pipe)==-1 )  {
		LOG(L_ERR,"ERROR:extcmd_init: cannot reply pipe! Reason=%s\n",
			strerror(errno) );
		goto error;
	}
	if ( pipe(req_pipe)==-1 )  {
		LOG(L_ERR,"ERROR:extcmd_init: cannot request pipe! Reason=%s\n",
			strerror(errno) );
		goto error;
	}


	return 0;
error:
	return -1;
}




int extcmd_child_init(int rank)
{
	int foo;

	/* only the child 1 will fork */
	if (rank==1) {
		/* creates a process that listen for connections */
		if ( (foo=fork())<0 ) {
			LOG(L_ERR,"ERROR: extcmd_child_init: cannot fork \n");
			goto error;
		}
		/* the child will run the listening routine ;-) */
		if (!foo) {
			close( rpl_pipe[1] );
			close( req_pipe[1] );
			extcmd_server_process( server_sock );
		}
	}

	/* close the reading ends of pipes */
	close( rpl_pipe[0] );
	close( req_pipe[0] );

	return 0;
error:
	return-1;
}