/
sl_funcs.c
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/
sl_funcs.c
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/*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of opensips, a free SIP server.
*
* opensips 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
*
* opensips 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
*
* History:
* -------
* 2003-02-11 modified sl_send_reply to use the transport independent
* msg_send (andrei)
* 2003-02-18 replaced TOTAG_LEN w/ TOTAG_VALUE_LEN (it was defined twice
* w/ different values!) (andrei)
* 2003-03-06 aligned to request2response use of tag bookmarks (jiri)
* 2003-04-04 modified sl_send_reply to use src_port if rport is present
* in the topmost via (andrei)
* 2003-09-11: updated to new build_lump_rpl() interface (bogdan)
* 2003-09-11: sl_tag converted to str to fit to the new
* build_res_buf_from_sip_req() interface (bogdan)
* 2003-11-11: build_lump_rpl() removed, add_lump_rpl() has flags (bogdan)
* 2004-10-10: use of mhomed disabled for replies (jiri)
* 2006-03-29: callbacks for sending replies added (bogdan)
* 2006-11-28: Moved numerical code tracking out of sl_send_reply() and into
* update_sl_reply_stat(). Also added more detail stat collection.
* (Jeffrey Magder - SOMA Networks)
*/
#include "../../globals.h"
#include "../../forward.h"
#include "../../dprint.h"
#include "../../md5utils.h"
#include "../../msg_translator.h"
#include "../../timer.h"
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"
#include "../../crc.h"
#include "../../dset.h"
#include "../../data_lump_rpl.h"
#include "../../action.h"
#include "../../config.h"
#include "../../tags.h"
#include "../../script_cb.h"
#include "../../sl_cb.h"
#include "sl.h"
#include "sl_funcs.h"
#include "../../usr_avp.h"
#include <string.h>
/* to-tag including pre-calculated and fixed part */
static char sl_tag_buf[TOTAG_VALUE_LEN];
static str sl_tag = {sl_tag_buf,TOTAG_VALUE_LEN};
/* from here, the variable prefix begins */
static char *tag_suffix;
/* if we for this time did not send any stateless reply,
we do not filter */
static unsigned int *sl_timeout = 0;
int sl_startup(void)
{
init_tags( sl_tag.s, &tag_suffix,
"OpenSIPS-stateless",
SL_TOTAG_SEPARATOR );
/*timeout*/
sl_timeout = (unsigned int*)shm_malloc(sizeof(unsigned int));
if (!sl_timeout)
{
LM_ERR("no more shm memory!\n");
return -1;
}
*(sl_timeout)=get_ticks();
return 0;
}
int sl_shutdown(void)
{
if (sl_timeout)
shm_free(sl_timeout);
return 1;
}
int sl_gen_totag(struct sip_msg *msg, str *totag)
{
calc_tag_suffix( msg, tag_suffix );
*totag = sl_tag;
return 1;
}
/* Take care of the statistics associated with numerical codes and replies */
static inline void update_sl_reply_stat(int code)
{
stat_var *numerical_stat;
/* If stats aren't enabled, just skip over this. */
if (!sl_enable_stats)
return;
/* OpenSIPS already kept track of the total number of 1xx, 2xx, replies.
* There may be setups that still expect these variables to exist, so we
* don't touch them */
if (code < 200 ) {
update_stat( tx_1xx_rpls , 1);
} else if (code<300) {
update_stat( tx_2xx_rpls , 1);
} else if (code<400) {
update_stat( tx_3xx_rpls , 1);
} else if (code<500) {
update_stat( tx_4xx_rpls , 1);
} else if (code<600) {
update_stat( tx_5xx_rpls , 1);
} else {
update_stat( tx_6xx_rpls , 1);
}
update_stat( sent_rpls , 1);
numerical_stat = get_stat_var_from_num_code(code, 1);
if (numerical_stat != NULL)
update_stat(numerical_stat, 1);
}
int sl_send_reply_helper(struct sip_msg *msg ,int code, str *text)
{
str buf;
union sockaddr_union to;
char *dset;
int dset_len;
struct bookmark dummy_bm;
int backup_mhomed;
int ret;
if ( msg->REQ_METHOD==METHOD_ACK)
return 1;
update_sock_struct_from_ip( &to, msg );
/* if that is a redirection message, dump current message set to it */
if (code>=300 && code<400) {
dset=print_dset(msg, &dset_len);
if (dset) {
add_lump_rpl(msg, dset, dset_len, LUMP_RPL_HDR);
}
}
/* add a to-tag if there is a To header field without it */
if ( code>=180 &&
(msg->to || (parse_headers(msg,HDR_TO_F, 0)!=-1 && msg->to))
&& (get_to(msg)->tag_value.s==0 || get_to(msg)->tag_value.len==0) )
{
calc_tag_suffix( msg, tag_suffix );
buf.s = build_res_buf_from_sip_req( code, text, &sl_tag, msg,
(unsigned int*)&buf.len, &dummy_bm);
} else {
buf.s = build_res_buf_from_sip_req( code, text, 0, msg,
(unsigned int*)&buf.len, &dummy_bm);
}
if (!buf.s) {
LM_ERR("response building failed\n");
goto error;
}
slcb_run_reply_out( msg, &buf, &to, code);
/* supress multhoming support when sending a reply back -- that makes sure
that replies will come from where requests came in; good for NATs
(there is no known use for mhomed for locally generated replies;
note: forwarded cross-interface replies do benefit of mhomed!
*/
backup_mhomed=mhomed;
mhomed=0;
/* use for sending the received interface -bogdan*/
ret = msg_send( msg->rcv.bind_address, msg->rcv.proto, &to,
msg->rcv.proto_reserved1, buf.s, buf.len, NULL);
mhomed=backup_mhomed;
pkg_free(buf.s);
if (ret<0)
goto error;
*(sl_timeout) = get_ticks() + SL_RPL_WAIT_TIME;
update_sl_reply_stat(code);
return 1;
error:
return -1;
}
int sl_send_reply(struct sip_msg *msg ,int code, str *text, str *totag)
{
int ret;
if ( (ret=sl_send_reply_helper(msg, code, text))<0)
return ret;
if (totag)
*totag = sl_tag;
return ret;
}
int sl_reply_error(struct sip_msg *msg )
{
char err_buf[MAX_REASON_LEN];
int sip_error;
str text;
int ret;
ret = err2reason_phrase( prev_ser_error, &sip_error,
err_buf, sizeof(err_buf), "SL");
if (ret<=0) {
LM_ERR("err2reason failed\n");
return -1;
}
text.len = ret;
text.s = err_buf;
LM_DBG("error text is %.*s\n",text.len,text.s);
ret = sl_send_reply_helper( msg, sip_error, &text);
if (ret==-1)
return -1;
if_update_stat( sl_enable_stats, sent_err_rpls , 1);
return ret;
}
/* Returns:
0 : ACK to a local reply
-1 : error
1 : is not an ACK or a non-local ACK
*/
int sl_filter_ACK(struct sip_msg *msg, void *bar )
{
str *tag_str;
if (msg->first_line.u.request.method_value!=METHOD_ACK)
goto pass_it;
/*check the timeout value*/
if ( *(sl_timeout)<= get_ticks() )
{
LM_DBG("too late to be a local ACK!\n");
goto pass_it;
}
/*force to parse to header -> we need it for tag param*/
if (parse_headers( msg, HDR_TO_F, 0 )==-1)
{
LM_ERR("unable to parse To header\n");
return SCB_RUN_ALL;
}
if (msg->to) {
tag_str = &(get_to(msg)->tag_value);
if ( tag_str->len==TOTAG_VALUE_LEN )
{
/* calculate the variable part of to-tag */
calc_tag_suffix(msg, tag_suffix);
/* test whether to-tag equal now */
if (memcmp(tag_str->s,sl_tag.s,sl_tag.len)==0) {
LM_DBG("local ACK found -> dropping it!\n");
if_update_stat( sl_enable_stats, rcv_acks, 1);
slcb_run_ack_in( msg );
return SCB_DROP_MSG;
}
}
}
pass_it:
return SCB_RUN_ALL;
}