uac_fifo.c

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

/*
 * $Id: uac_fifo.c,v 1.12 2004/11/09 15:15:12 andrei 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:
 * --------
 *  2003-12-03 : fifo_callback() updated for changes in tm callbacks (bogdan)
 *  2004-02-11: fix: TM callback writes to fifo changed to non-blocking (jiri)
 */

#include <string.h>
#include "../../mem/shm_mem.h"
#include "../../mem/mem.h"
#include "../../dprint.h"
#include "../../fifo_server.h"
#include "../../str.h"
#include "../../parser/msg_parser.h"
#include "../../parser/parse_from.h"
#include "../../parser/parse_uri.h"
#include "../../ip_addr.h"
#include "config.h"
#include "ut.h"
#include "uac.h"
#include "dlg.h"
#include "callid.h"
#include "h_table.h"
#include "uac_fifo.h"


/*
 * Callback data structure
 */
struct cb_data {
	dlg_t* dialog;
	char filename[1];
};


struct str_list {
	str s;
	struct str_list *next;
};


#define skip_hf(_hf) (             \
    ((_hf)->type == HDR_FROM)   || \
    ((_hf)->type == HDR_TO)     || \
    ((_hf)->type == HDR_CALLID) || \
    ((_hf)->type == HDR_CSEQ)      \
)


/*
 * Report an error to syslog and FIFO output file
 */
static inline void fifo_uac_error(char *reply_fifo, int code, char *msg)
{
	LOG(L_ERR, "ERROR: fifo_uac_error: %s\n", msg ); 
	fifo_reply(reply_fifo, "%d fifo_uac_error: %s", code, msg);
}


/*
 * Get the Request URI from the FIFO stream and parse it
 */
static inline int fifo_get_ruri(FILE* stream, char* response_file, str* ruri, struct sip_uri* puri)
{
	static char ruri_buf[MAX_URI_SIZE];

	if (!read_line(ruri_buf, MAX_URI_SIZE, stream, &ruri->len) || !ruri->len) {
		fifo_uac_error(response_file, 400, "ruri expected");
		return -1;
	}
	
	if (parse_uri(ruri_buf, ruri->len, puri) < 0 ) {
		fifo_uac_error(response_file, 400, "ruri invalid\n");
		return -2;
	}
	ruri->s = ruri_buf;
	DBG("DEBUG: fifo_get_ruri: '%.*s'\n", ruri->len, ruri->s);
	return 0;
}


/*
 * Get and parse next hop URI
 */
static inline int fifo_get_nexthop(FILE* stream, char* response_file, str* nexthop, struct sip_uri* pnexthop)
{
	static char nexthop_buf[MAX_URI_SIZE];

	if (!read_line(nexthop_buf, MAX_URI_SIZE, stream, &nexthop->len) || !nexthop->len) {
		fifo_uac_error(response_file, 400, "next hop address expected\n");
		return -1;
	}

	if (nexthop->len == 1 && nexthop_buf[0] == '.' ) {
		DBG("DEBUG: fifo_get_nexthop: next hop empty\n");
		nexthop->s = 0; 
		nexthop->len = 0;
	} else if (parse_uri(nexthop_buf, nexthop->len, pnexthop) < 0 ) {
		fifo_uac_error(response_file, 400, "next hop uri invalid\n");
		return -2;
	} else {
		nexthop->s = nexthop_buf;
		DBG("DEBUG: fifo_get_nexthop: hop: '%.*s'\n", nexthop->len, nexthop->s);
	}

	return 0;
}


/*
 * Get method name from FIFO stream
 */
static inline int fifo_get_method(FILE* stream, char* response_file, str* method)
{
	static char method_buf[MAX_METHOD];

	if (!read_line(method_buf, MAX_METHOD, stream, &method->len) || !method->len) {
		     /* line breaking must have failed -- consume the rest
			and proceed to a new request
		     */
		fifo_uac_error(response_file, 400, "method expected");
		return -1;
	}
	method->s = method_buf;
	DBG("fifo_get_method: method: '%.*s'\n", method->len, method->s);
	return 0;
}


/*
 * Get message body from FIFO stream
 */
static inline int fifo_get_body(FILE* stream, char* response_file, str* body)
{
	static char body_buf[MAX_BODY];

	if (!read_body(body_buf, MAX_BODY, stream, &body->len)) {
		fifo_uac_error(response_file, 400, "body expected");
		return -1;
	}
	body->s = body_buf;
	DBG("fifo_get_body: body: %.*s\n", body->len,  body->s);
	return 0;
}


/*
 * Get message headers from FIFO stream
 */
static inline int fifo_get_headers(FILE* stream, char* response_file, str* headers)
{
	static char headers_buf[MAX_HEADER];

	     /* now read and parse header fields */
	if (!read_line_set(headers_buf, MAX_HEADER, stream, &headers->len) || !headers->len) {
		fifo_uac_error(response_file, 400, "HFs expected");
		return -1;
	}
	headers->s = headers_buf;
	DBG("fifo_get_headers: headers: %.*s\n", headers->len, headers->s);
	return 0;
}


/*
 * Create shm_copy of filename
 */
static inline int fifo_cbp(char** shm_file, char* response_file)
{
	int fn_len;

	if (response_file) {
		fn_len = strlen(response_file) + 1;
		*shm_file = shm_malloc(fn_len);
		if (!*shm_file) {
			fifo_uac_error(response_file, 500, "no shmem");
			return -1;
		}
		memcpy(*shm_file, response_file, fn_len);
	} else {
		*shm_file = 0;
	}
	return 0;
}


static inline struct str_list *new_str(char *s, int len, struct str_list **last, int *total)
{
	struct str_list *new;
	new=pkg_malloc(sizeof(struct str_list));
	if (!new) {
		LOG(L_ERR, "ERROR: new_str: not enough mem\n");
		return 0;
	}
	new->s.s=s;
	new->s.len=len;
	new->next=0;

	(*last)->next=new;
	*last=new;
	*total+=len;

	return new;
}


static char *get_hfblock(str *uri, struct hdr_field *hf, int *l, int proto) 
{
	struct str_list sl, *last, *new, *i, *foo;
	int hf_avail, frag_len, total_len;
	char *begin, *needle, *dst, *ret, *d;
	str *sock_name, *portname;
	union sockaddr_union to_su;
	struct socket_info* send_sock;

	ret=0; /* pessimist: assume failure */
	total_len=0;
	last=&sl;
	last->next=0;
	portname=sock_name=0;

	for (; hf; hf=hf->next) {
		if (skip_hf(hf)) continue;

		begin=needle=hf->name.s; 
		hf_avail=hf->len;

		/* substitution loop */
		while(hf_avail) {
			d=memchr(needle, SUBST_CHAR, hf_avail);
			if (!d || d+1>=needle+hf_avail) { /* nothing to substitute */
				new=new_str(begin, hf_avail, &last, &total_len); 
				if (!new) goto error;
				break;
			} else {
				frag_len=d-begin;
				d++; /* d not at the second substitution char */
				switch(*d) {
					case SUBST_CHAR:	/* double SUBST_CHAR: IP */
						/* string before substitute */
						new=new_str(begin, frag_len, &last, &total_len); 
						if (!new) goto error;
						/* substitute */
						if (!sock_name) {
							send_sock=uri2sock(0, uri, &to_su, proto );
							if (!send_sock) {
								LOG(L_ERR, "ERROR: get_hfblock: send_sock failed\n");
								goto error;
							}
							sock_name=&send_sock->address_str;
							portname=&send_sock->port_no_str;
						}
						new=new_str(sock_name->s, sock_name->len,
								&last, &total_len );
						if (!new) goto error;
						/* inefficient - FIXME --andrei*/
						new=new_str(":", 1, &last, &total_len);
						if (!new) goto error;
						new=new_str(portname->s, portname->len,
								&last, &total_len );
						if (!new) goto error;
						/* keep going ... */
						begin=needle=d+1;hf_avail-=frag_len+2;
						continue;
					default:
						/* no valid substitution char -- keep going */
						hf_avail-=frag_len+1;
						needle=d;
				}
			} /* possible substitute */
		} /* substitution loop */
		/* proceed to next header */
		/* new=new_str(CRLF, CRLF_LEN, &last, &total_len );
		if (!new) goto error; */
		DBG("DEBUG: get_hfblock: one more hf processed\n");
	} /* header loop */


	/* construct a single header block now */
	ret=pkg_malloc(total_len);
	if (!ret) {
		LOG(L_ERR, "ERROR: get_hfblock no pkg mem for hf block\n");
		goto error;
	}
	i=sl.next;
	dst=ret;
	while(i) {
		foo=i;
		i=i->next;
		memcpy(dst, foo->s.s, foo->s.len);
		dst+=foo->s.len;
		pkg_free(foo);
	}
	*l=total_len;
	return ret;

error:
	i=sl.next;
	while(i) {
		foo=i;
		i=i->next;
		pkg_free(foo);
	}
	*l=0;
	return 0;
}


/* syntax:

	:t_uac:[file] EOL
	method EOL
	r-uri EOL