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kamailio/modules_s/rr/loose.c

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/*
* Route & Record-Route module, loose routing support
*
* $Id$
*
* Copyright (C) 2001-2004 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:
* info@iptel.org
*
* 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:
* ---------
* 2003-02-28 scratchpad compatibility abandoned (jiri)
* 2003-01-27 next baby-step to removing ZT - PRESERVE_ZT (jiri)
* 2006-01-09 store user part of Route URI in AVP (if required) (mma)
* 2009-05-26 Force the send socket if two RR headers were added (Miklos)
*/
#include <string.h>
#include "../../ut.h"
#include "../../str.h"
#include "../../dprint.h"
#include "../../forward.h"
#include "../../data_lump.h"
#include "../../parser/parse_rr.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_from.h"
#include "../../mem/mem.h"
#include "../../dset.h"
#include "../../socket_info.h"
#include "loose.h"
#include "rr_mod.h"
#include "avp_cookie.h"
#define RR_ERROR -1 /* An error occured while processing route set */
#define RR_DRIVEN 1 /* The next hop is determined from the route set */
#define NOT_RR_DRIVEN -1 /* The next hop is not determined from the route set */
#define MY_RT_PREFIX ROUTE_PREFIX "<"
#define MY_RT_PREFIX_LEN (sizeof(MY_RT_PREFIX)-1)
#define MY_RT_SUFFIX ">\r\n"
#define MY_RT_SUFFIX_LEN (sizeof(MY_RT_SUFFIX)-1)
/*
* Check if the To-tag is set in the message
*/
static int has_to_tag(struct sip_msg* msg)
{
str tag;
if (!msg->to && parse_headers(msg, HDR_TO_F, 0) == -1) {
LOG(L_ERR, "has_to_tag: Cannot parse To header field\n");
return -1;
}
if (!msg->to) {
LOG(L_ERR, "has_to_tag: To header field not found\n");
return -1;
}
tag = get_to(msg)->tag_value;
if (tag.s == 0 || tag.len == 0) {
DBG("has_to_tag: No\n");
return 0;
}
DBG("has_to_tag: Yes\n");
return 1;
}
/*
* Parse the message and find first occurrence of
* Route header field. The function returns -1 or -2
* on a parser error, 0 if there is a Route HF and
* 1 if there is no Route HF.
*/
static inline int find_first_route(struct sip_msg* _m)
{
if (parse_headers(_m, HDR_ROUTE_F, 0) == -1) {
LOG(L_ERR, "find_first_route: Error while parsing headers\n");
return -1;
} else {
if (_m->route) {
if (parse_rr(_m->route) < 0) {
LOG(L_ERR, "find_first_route: Error while parsing Route HF\n");
return -2;
}
return 0;
} else {
DBG("find_first_route: No Route headers found\n");
return 1;
}
}
}
/*
* Check if URI is myself
*/
static inline int is_myself(str* _host, unsigned short _port)
{
str did;
int ret;
ret = check_self(_host, _port ? _port : SIP_PORT, 0);/* match all protos*/
if (ret < 0) return 0;
if (ret == 0 && dm_get_did) {
ret = dm_get_did(&did, _host);
if (ret < 0) return 0;
else if (ret > 0) {
/* as the domain module does not know anything about ports
lets check if the port matches any of our listening ports */
ret = check_self_port(_port ? _port : SIP_PORT, 0);
}
}
return ret;
}
static inline void store_user_in_avps(str* user)
{
avp_value_t val;
if (user_part_avp_ident.name.s.s && user_part_avp_ident.name.s.len && user && user->s && user->len) {
val.s = *user;
add_avp(user_part_avp_ident.flags | AVP_NAME_STR | AVP_VAL_STR, user_part_avp_ident.name, val);
}
}
static inline void store_next_route_in_avps(str* uri)
{
avp_value_t val;
if (next_route_avp_ident.name.s.s && next_route_avp_ident.name.s.len && uri && uri->s && uri->len) {
val.s = *uri;
add_avp(next_route_avp_ident.flags | AVP_NAME_STR | AVP_VAL_STR, next_route_avp_ident.name, val);
}
}
/*
* Find and parse next Route header field
*/
static inline int find_next_route(struct sip_msg* _m, struct hdr_field** _hdr)
{
struct hdr_field* ptr;
ptr = (*_hdr)->next;
/* Try to find already parsed Route headers */
while(ptr) {
if (ptr->type == HDR_ROUTE_T) goto found;
ptr = ptr->next;
}
/* There are no already parsed Route headers, try to find next
* occurrence of Route header
*/
if (parse_headers(_m, HDR_ROUTE_F, 1) == -1) {
LOG(L_ERR, "find_next_route: Error while parsing headers\n");
return -1;
}
if ((_m->last_header->type != HDR_ROUTE_T) || (_m->last_header == *_hdr)) {
DBG("find_next_route: No next Route HF found\n");
return 1;
}
ptr = _m->last_header;
found:
if (parse_rr(ptr) < 0) {
LOG(L_ERR, "find_next_route: Error while parsing Route body\n");
return -2;
}
*_hdr = ptr;
return 0;
}
/*
* Check if the given uri contains lr parameter which marks loose routers
*/
static inline int is_strict(str* _params)
{
str s;
int i, state = 0;
if (_params->len == 0) return 1;
s.s = _params->s;
s.len = _params->len;
for(i = 0; i < s.len; i++) {
switch(state) {
case 0:
switch(s.s[i]) {
case ' ':
case '\r':
case '\n':
case '\t': break;
case 'l':
case 'L': state = 1; break;
default: state = 4; break;
}
break;
case 1:
switch(s.s[i]) {
case 'r':
case 'R': state = 2; break;
default: state = 4; break;
}
break;
case 2:
switch(s.s[i]) {
case ';': return 0;
case '=': return 0;
case ' ':
case '\r':
case '\n':
case '\t': state = 3; break;
default: state = 4; break;
}
break;
case 3:
switch(s.s[i]) {
case ';': return 0;
case '=': return 0;
case ' ':
case '\r':
case '\n':
case '\t': break;
default: state = 4; break;
}
break;
case 4:
switch(s.s[i]) {
case '\"': state = 5; break;
case ';': state = 0; break;
default: break;
}
break;
case 5:
switch(s.s[i]) {
case '\\': state = 6; break;
case '\"': state = 4; break;
default: break;
}
break;
case 6: state = 5; break;
}
}
if ((state == 2) || (state == 3)) return 0;
else return 1;
}
/* check direction using ftag */
static int get_direction(struct sip_msg* _m, str* _params) {
str s, ftag;
int i, state = 0;
if (_params->len == 0) return 0;
ftag.len = 0;
ftag.s = 0;
s.s = _params->s;
s.len = _params->len;
for(i = 0; i < s.len; i++) {
switch(state) {
case 0:
switch(s.s[i]) {
case ' ':
case '\r':
case '\n':
case '\t': break;
case 'f':
case 'F': state = 1; break;
default: state = 8; break;
}
break;
case 1:
switch(s.s[i]) {
case 't':
case 'T': state = 2; break;
default: state = 8; break;
}
break;
case 2:
switch(s.s[i]) {
case 'a':
case 'A': state = 3; break;
default: state = 8; break;
}
break;
case 3:
switch(s.s[i]) {
case 'g':
case 'G': state = 4; break;
default: state = 8; break;
}
break;
case 4:
switch(s.s[i]) {
case ';': return 0;
case '=': state = 6; break;
case ' ':
case '\r':
case '\n':
case '\t': state = 5; break;
default: state = 8; break;
}
break;
case 5:
switch(s.s[i]) {
case ';': return 0;
case '=': state = 6; break;
case ' ':
case '\r':
case '\n':
case '\t': break;
default: state = 8; break;
}
break;
case 6:
switch(s.s[i]) {
case '\"': state=101; break;
case ';': return 0;
case ' ':
case '\r':
case '\n':
case '\t': break;
default: state = 100; ftag.s = s.s+i; break;
}
break;
case 8:
switch(s.s[i]) {
case '\"': state = 9; break;
case ';': state = 0; break;
default: break;
}
break;
case 9:
switch(s.s[i]) {
case '\\': state = 10; break;
case '\"': state = 8; break;
default: break;
}
break;
case 10: state = 9;
break;
case 100:
switch(s.s[i]) {
case '\"': return 0;
case ';':
case ' ':
case '\r':
case '\n':
case '\t': ftag.len = s.s+i - ftag.s;
i = s.len;
state = 0;
break;
}
break;
case 101: /* no escape chars supported in base64 algorithm */
switch(s.s[i]) {
case '\"': ftag.len = s.s+i - ftag.s; break;
case '\\': state = 102; break;
default: break;
}
break;
case 102:
state = 101;
break;
}
}
if (state == 100)
ftag.len = s.s+i - ftag.s;
if (ftag.len) {
if ((parse_from_header(_m)==0) && get_from(_m)) {
/* compare if from.tag == ftag */
if (ftag.len!=get_from(_m)->tag_value.len || strncmp(ftag.s, get_from(_m)->tag_value.s, ftag.len)) return 1;
}
}
return 0;
}
static void get_avp_cookie_from_uri(str* _params, str *_avp_cookie) {
str s;
int i, state = 0;
_avp_cookie->len = 0;
_avp_cookie->s = 0;
if (_params->len == 0) return;
s.s = _params->s;
s.len = _params->len;
for(i = 0; i < s.len; i++) {
switch(state) {
case 0:
switch(s.s[i]) {
case ' ':
case '\r':
case '\n':
case '\t': break;
case 'a':
case 'A': state = 1; break;
default: state = 7; break;
}
break;
case 1:
switch(s.s[i]) {
case 'v':
case 'V': state = 2; break;
default: state = 7; break;
}
break;
case 2:
switch(s.s[i]) {
case 'p':
case 'P': state = 3; break;
default: state = 7; break;
}
break;
case 3:
switch(s.s[i]) {
case ';': return;
case '=': state = 5; break;
case ' ':
case '\r':
case '\n':
case '\t': state = 4; break;
default: state = 7; break;
}
break;
case 4:
switch(s.s[i]) {
case ';': return;
case '=': state = 5; break;
case ' ':
case '\r':
case '\n':
case '\t': break;
default: state = 7; break;
}
break;
case 5:
switch(s.s[i]) {
case '\"': state=101; break;
case ';': return;
case ' ':
case '\r':
case '\n':
case '\t': break;
default: state = 100; _avp_cookie->s = s.s+i; break;
}
break;
case 7:
switch(s.s[i]) {
case '\"': state = 8; break;
case ';': state = 0; break;
default: break;
}
break;
case 8:
switch(s.s[i]) {
case '\\': state = 9; break;
case '\"': state = 7; break;
default: break;
}
break;
case 9: state = 8;
break;
case 100:
switch(s.s[i]) {
case '\"': return;
case ';':
case ' ':
case '\r':
case '\n':
case '\t': _avp_cookie->len = s.s+i - _avp_cookie->s;
i = s.len;
state = 0;
break;
}
break;
case 101: /* no escape chars supported in base64 algorithm */
switch(s.s[i]) {
case '\"': _avp_cookie->len = s.s+i - _avp_cookie->s; break;
case '\\': state = 102; break;
default: break;
}
break;
case 102:
state = 101;
break;
}
}
if (state == 100)
_avp_cookie->len = s.s+i - _avp_cookie->s;
}
/*
* Put Request-URI as last Route header of a SIP
* message, this is necessary when forwarding to
* a strict router
*/
static inline int save_ruri(struct sip_msg* _m)
{
struct lump* anchor;
char *s;
int len;
/* We must parse the whole message header here,
* because Request-URI must be saved in last
* Route HF in the message
*/
if (parse_headers(_m, HDR_EOH_F, 0) == -1) {
LOG(L_ERR, "save_ruri: Error while parsing message\n");
return -1;
}
/* Create an anchor */
anchor = anchor_lump(_m, _m->unparsed - _m->buf, 0, 0);
if (anchor == 0) {
LOG(L_ERR, "save_ruri: Can't get anchor\n");
return -2;
}
/* Create buffer for new lump */
len = MY_RT_PREFIX_LEN + _m->first_line.u.request.uri.len + MY_RT_SUFFIX_LEN;
s = (char*)pkg_malloc(len);
if (!s) {
LOG(L_ERR, "save_ruri: No memory left\n");
return -3;
}
/* Create new header field */
memcpy(s, MY_RT_PREFIX, MY_RT_PREFIX_LEN);
memcpy(s + MY_RT_PREFIX_LEN, _m->first_line.u.request.uri.s, _m->first_line.u.request.uri.len);
memcpy(s + MY_RT_PREFIX_LEN + _m->first_line.u.request.uri.len, MY_RT_SUFFIX, MY_RT_SUFFIX_LEN);
DBG("save_ruri: New header: '%.*s'\n", len, ZSW(s));
/* Insert it */
if (insert_new_lump_before(anchor, s, len, 0) == 0) {
pkg_free(s);
LOG(L_ERR, "save_ruri: Cannot insert lump\n");
return -4;
}
return 0;
}
/*
* Logic necessary to forward request to strict routers
*
* Returns 0 on success, negative number on an error
*/
static inline int handle_sr(struct sip_msg* _m, struct hdr_field* _hdr, rr_t* _r)
{
str* uri;
char* rem_off;
int rem_len;
uri = &_r->nameaddr.uri;
/* Next hop is strict router, save R-URI here */
if (save_ruri(_m) < 0) {
LOG(L_ERR, "handle_sr: Error while saving Request-URI\n");
return -1;
}
/* Put the first Route in Request-URI */
if (rewrite_uri(_m, uri) < 0) {
LOG(L_ERR, "handle_sr: Error while rewriting request URI\n");
return -2;
}
if (!_r->next) {
rem_off = _hdr->name.s;
rem_len = _hdr->len;
} else {
rem_off = _hdr->body.s;
rem_len = _r->next->nameaddr.name.s - _hdr->body.s;
}
if (!del_lump(_m, rem_off - _m->buf, rem_len, 0)) {
LOG(L_ERR, "handle_sr: Can't remove Route HF\n");
return -9;
}
return 0;
}
/*
* Find last route in the last Route header field,
* if there was a previous route in the last Route header
* field, it will be saved in _p parameter
*/
static inline int find_rem_target(struct sip_msg* _m, struct hdr_field** _h, rr_t** _l, rr_t** _p)
{
struct hdr_field* ptr, *last;
if (parse_headers(_m, HDR_EOH_F, 0) == -1) {
LOG(L_ERR, "find_rem_target: Error while parsing message header\n");
return -1;
}
ptr = _m->route;
last = 0;
while(ptr) {
if (ptr->type == HDR_ROUTE_T) last = ptr;
ptr = ptr->next;
}
if (last) {
if (parse_rr(last) < 0) {
LOG(L_ERR, "find_rem_target: Error while parsing last Route HF\n");
return -2;
}
*_h = last;
*_p = 0;
*_l = (rr_t*)last->parsed;
while ((*_l)->next) {
*_p = *_l;
*_l = (*_l)->next;
}
return 0;
} else {
LOG(L_ERR, "find_rem_target: Can't find last Route HF\n");
return 1;
}
}
/*
* Previous hop was a strict router, handle this case
*/
static inline int after_strict(struct sip_msg* _m, struct sip_uri* _pru, int _route_myself)
{
int res, rem_len;
struct hdr_field* hdr;
rr_t* rt, *prev;
char* rem_off;
str* uri;
str avp_cookie;
get_avp_cookie_from_uri(&_m->parsed_uri.params, &avp_cookie);
if (avp_cookie.len > 0)
rr_set_avp_cookies(&avp_cookie, get_direction(_m, &_m->parsed_uri.params));
hdr = _m->route;
rt = (rr_t*)hdr->parsed;
if (_route_myself == 1) {
store_user_in_avps(&(_pru->user));
if (!rt->next) {
/* No next route in the same header, remove the whole header
* field immediately
*/
if (!del_lump(_m, hdr->name.s - _m->buf, hdr->len, 0)) {
LOG(L_ERR, "after_strict: Cannot remove Route HF\n");
return RR_ERROR;
}
res = find_next_route(_m, &hdr);
if (res < 0) {
LOG(L_ERR, "after_strict: Error while searching next route\n");
return RR_ERROR;
}
if (res > 0) { /* No next route found */
DBG("after_strict: No next URI found\n");
return NOT_RR_DRIVEN;
}
rt = (rr_t*)hdr->parsed;
} else rt = rt->next;
}
if (rt != _m->route->parsed) {
uri = &rt->nameaddr.uri;
if (parse_uri(uri->s, uri->len, _pru) == -1) {
LOG(L_ERR, "after_strict: Error while parsing URI\n");
return RR_ERROR;
}
} else {
uri = &rt->nameaddr.uri;
}
store_next_route_in_avps(uri);
if (is_strict(&(_pru->params))) {
DBG("after_strict: Next hop: '%.*s' is strict router\n", uri->len, ZSW(uri->s));
/* Previous hop was a strict router and the next hop is strict
* router too. There is no need to save R-URI again because it
* is saved already. In fact, in this case we will behave exactly
* like a strict router.
*/
/* Note: when there is only one Route URI left (endpoint), it will
* always be a strict router because endpoints don't use ;lr parameter
* In this case we will simply put the URI in R-URI and forward it, which
* will work perfectly
*/
if (rewrite_uri(_m, uri) < 0) {
LOG(L_ERR, "after_strict: Error while rewriting request URI\n");
return RR_ERROR;
}
if (rt->next) {
rem_off = hdr->body.s;
rem_len = rt->next->nameaddr.name.s - hdr->body.s;
} else {
rem_off = hdr->name.s;
rem_len = hdr->len;
}
if (!del_lump(_m, rem_off - _m->buf, rem_len, 0)) {
LOG(L_ERR, "after_strict: Cannot remove Route HF\n");
return RR_ERROR;
}
} else {
DBG("after_strict: Next hop: '%.*s' is loose router\n", uri->len, ZSW(uri->s));
if (set_dst_uri(_m, uri) < 0) {
LOG(L_ERR, "after_strict: Error while setting dst_uri\n");
return RR_ERROR;
}
/* Next hop is a loose router - Which means that is is not endpoint yet
* In This case we have to recover from previous strict routing, that
* means we have to find the last Route URI and put in in R-URI and
* remove the last Route URI.
*/
if (rt != hdr->parsed) {
/* There is a previous route uri which was 2nd uri of mine
* and must be removed here
*/
rem_off = hdr->body.s;
rem_len = rt->nameaddr.name.s - hdr->body.s;
if (!del_lump(_m, rem_off - _m->buf, rem_len, 0)) {
LOG(L_ERR, "after_strict: Can't remove Route HF\n");
return RR_ERROR;
}
}
res = find_rem_target(_m, &hdr, &rt, &prev);
if (res < 0) {
LOG(L_ERR, "after_strict: Error while looking for last Route URI\n");
return RR_ERROR;
} else if (res > 0) {
/* No remote target is an error */
return RR_ERROR;
}
uri = &rt->nameaddr.uri;
if (rewrite_uri(_m, uri) < 0) {
LOG(L_ERR, "after_strict: Can't rewrite R-URI\n");
return RR_ERROR;
}
/* The first character if uri will be either '<' when it is the only URI in a
* Route header field or ',' if there is more than one URI in the header field
*/
DBG("after_strict: The last route URI: '%.*s'\n",
rt->nameaddr.uri.len, ZSW(rt->nameaddr.uri.s));
if (prev) {
rem_off = prev->nameaddr.name.s + prev->len;
rem_len = rt->nameaddr.name.s + rt->len - rem_off;
} else {
rem_off = hdr->name.s;
rem_len = hdr->len;
}
if (!del_lump(_m, rem_off - _m->buf, rem_len, 0)) {
LOG(L_ERR, "after_strict: Can't remove Route HF\n");
return RR_ERROR;
}
}
return RR_DRIVEN;
}
static inline int after_loose(struct sip_msg* _m, struct sip_uri* _pru, int _route_myself, int _ruri_myself)
{
struct hdr_field* hdr;
rr_t* rt;
int res;
#ifdef ENABLE_USER_CHECK
int ret;
#endif
str* uri;
str avp_cookie;
struct sip_uri parsed_uri;
hdr = _m->route;
rt = (rr_t*)hdr->parsed;
uri = &rt->nameaddr.uri;
/* IF the URI was added by me, remove it */
if (_route_myself == 1) {
store_user_in_avps(&(_pru->user));
DBG("after_loose: Topmost route URI: '%.*s' is me\n", uri->len, ZSW(uri->s));
get_avp_cookie_from_uri(&(_pru->params), &avp_cookie);
if (avp_cookie.len > 0)
rr_set_avp_cookies(&avp_cookie, get_direction(_m, &(_pru->params)));
if (!rt->next) {
/* No next route in the same header, remove the whole header
* field immediately
*/
if (!del_lump(_m, hdr->name.s - _m->buf, hdr->len, 0)) {
LOG(L_ERR, "after_loose: Can't remove Route HF\n");
return RR_ERROR;
}
res = find_next_route(_m, &hdr);
if (res < 0) {
LOG(L_ERR, "after_loose: Error while finding next route\n");
return RR_ERROR;
}
if (res > 0) { /* No next route found */
DBG("after_loose: No next URI found\n");
if (_ruri_myself == 1) {
/* this a preloaded request. we do not check for the To-tag
* because the ACK for a negative reply will contain such
* a tag but the original INVITE not */
return NOT_RR_DRIVEN;
} else {
return RR_DRIVEN;
}
}
rt = (rr_t*)hdr->parsed;
} else rt = rt->next;
if (enable_double_rr && is_2rr(&(_pru->params))) {
if (rr_force_send_socket) {
if (parse_uri(rt->nameaddr.uri.s, rt->nameaddr.uri.len,
&parsed_uri) < 0
) {
LOG(L_ERR, "after_loose: Error while parsing the second route header\n");
return RR_ERROR;
}
set_force_socket(_m, grep_sock_info(&parsed_uri.host,
parsed_uri.port_no,
parsed_uri.proto) );
if (_m->force_send_socket == 0)
LOG(L_WARN, "after_loose: send socket cannot be set"
" based on the second route header\n");
/* Do not return error because there is still a chance
* that the outgoing socket will be correct, especially
* if mhomed is turned on. It can happen that the Route HF
* contains a domain name as opposed to ip address therefore
* the outgoing socket cannot be determined (easily) from the URI.
* (Miklos)
*/
}
if (!rt->next) {
/* No next route in the same header, remove the whole header
* field immediately
*/
if (!del_lump(_m, hdr->name.s - _m->buf, hdr->len, 0)) {
LOG(L_ERR, "after_loose: Can't remove Route HF\n");
return RR_ERROR;
}
res = find_next_route(_m, &hdr);
if (res < 0) {
LOG(L_ERR, "after_loose: Error while finding next route\n");
return RR_ERROR;
}
if (res > 0) { /* No next route found */
DBG("after_loose: No next URI found\n");
/* preloaded routes can not happen with double_rr, so
* we were just the last hop with double_rr */
return RR_DRIVEN;
}
rt = (rr_t*)hdr->parsed;
} else rt = rt->next;
}
if(rt != _m->route->parsed) {
uri = &rt->nameaddr.uri;
if (parse_uri(uri->s, uri->len, _pru) < 0) {
LOG(L_ERR, "after_loose: Error while parsing the next route URI\n");
return RR_ERROR;
}
}
} else {
#ifdef ENABLE_USER_CHECK
/* check if it the ignored user */
if(ret < 0)
return NOT_RR_DRIVEN;
#endif
DBG("after_loose: Topmost URI is NOT myself\n");
}
store_next_route_in_avps(uri);
DBG("after_loose: URI to be processed: '%.*s'\n", uri->len, ZSW(uri->s));
if (is_strict(&(_pru->params))) {
DBG("after_loose: Next URI is a strict router\n");
if (handle_sr(_m, hdr, rt) < 0) {
LOG(L_ERR, "after_loose: Error while handling strict router\n");
return RR_ERROR;
}
} else {
/* Next hop is loose router */
DBG("after_loose: Next URI is a loose router\n");
if (set_dst_uri(_m, uri) < 0) {
LOG(L_ERR, "after_loose: Error while setting dst_uri\n");
return RR_ERROR;
}
/* dst_uri changed, so it makes sense to re-use the current uri for
forking */
ruri_mark_new(); /* re-use uri for serial forking */
/* There is a previous route uri which was 2nd uri of mine
* and must be removed here
*/
if (rt != hdr->parsed) {
if (!del_lump(_m, hdr->body.s - _m->buf, rt->nameaddr.name.s - hdr->body.s, 0)) {
LOG(L_ERR, "after_loose: Can't remove Route HF\n");
return RR_ERROR;
}
}
}
return RR_DRIVEN;
}
/*
* Do loose routing as defined in RFC3621
*/
int loose_route(struct sip_msg* _m, char* _s1, char* _s2)
{
struct hdr_field* hdr;
struct sip_uri puri;
rr_t* rt;
int ret;
str* uri;
if (find_first_route(_m) != 0) {
DBG("loose_route: There is no Route HF\n");
return -1;
}
if (parse_sip_msg_uri(_m) == -1) {
LOG(L_ERR, "loose_route: Error while parsing Request URI\n");
return -1;
}
hdr = _m->route;
rt = (rr_t*)hdr->parsed;
uri = &rt->nameaddr.uri;
if (parse_uri(uri->s, uri->len, &puri) < 0) {
LOG(L_ERR, "loose_route: Error while parsing the first route URI\n");
return -1;
}
if (is_myself(&_m->parsed_uri.host, _m->parsed_uri.port_no)) {
DBG("loose_route: RURI is myself\n");
if ((ret = is_myself(&puri.host, puri.port_no)) == 1 &&
!(enable_double_rr && is_2rr(&puri.params))) {
DBG("loose_route: found preloaded loose route\n");
return after_loose(_m, &puri, ret, 1);
} else {
if (has_to_tag(_m) == 1) {
return after_strict(_m, &puri, ret);
} else {
LOG(L_WARN, "loose_route: pre-loaded strict routing?!\n");
return -1;
}
}
} else {
DBG("loose_route: RURI is NOT myself\n");
if (is_myself(&puri.host, puri.port_no)) {
return after_loose(_m, &puri, 1, 0);
} else {
store_next_route_in_avps(uri);
LOG(L_WARN, "loose_route: no routing target is local\n");
return -1;
}
}
}
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