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- preliminary (and reduced) support for Route Headers

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This commit is contained in:
Thomas Ries
2004-08-27 19:48:06 +00:00
parent 5bc5221a19
commit 3931143157
5 changed files with 408 additions and 174 deletions
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ChangeLog
+1
View File
@@ -1,5 +1,6 @@
0.5.8
=====
27-Aug-2004: - preliminary (and reduced) support for Route Headers
26-Aug-2004: - more DEBUG output
22-Aug-2004: - fix: secure_enviroment - set proper EGID (by Daniel Mueller)
19-Aug-2004: - fix: don't crash on missing Contact header during registration
src/Makefile.am
+1 -1
View File
@@ -27,7 +27,7 @@ AM_CFLAGS = -Wall -DBUILDSTR=\"`cat .buildno`\" -D_GNU_SOURCE
sbin_PROGRAMS = siproxd
siproxd_SOURCES = siproxd.c proxy.c register.c sock.c utils.c \
sip_utils.c log.c readconf.c rtpproxy.c \
rtpproxy_relay.c accessctl.c \
rtpproxy_relay.c accessctl.c route_processing.c \
security.c auth.c fwapi.c
#
src/proxy.c
+74 -172
View File
@@ -84,9 +84,6 @@ int proxy_request (sip_ticket_t *ticket) {
osip_message_t *request;
struct sockaddr_in *from;
#define REQTYP_INCOMING 1
#define REQTYP_OUTGOING 2
DEBUGC(DBCLASS_PROXY,"proxy_request");
if (ticket==NULL) {
@@ -102,55 +99,7 @@ int proxy_request (sip_ticket_t *ticket) {
* Proxy Behavior - Route Information Preprocessing
* (process Route header)
*/
/*
The proxy MUST inspect the Request-URI of the request. If the
Request-URI of the request contains a value this proxy previously
placed into a Record-Route header field (see Section 16.6 item 4),
the proxy MUST replace the Request-URI in the request with the last
value from the Route header field, and remove that value from the
Route header field. The proxy MUST then proceed as if it received
this modified request.
NOT IMPLEMENTED*/
/*
* Check if I am listed at the topmost Route header (if any Route
* header is existing at all). If so, remove it from the list and
* rewrite the request URI to point to the now topmost Route.
*/
if (request->routes && !osip_list_eol(request->routes, 0)) {
struct in_addr addr1, addr2, addr3;
osip_route_t *route;
route = (osip_route_t *) osip_list_get(request->routes, 0);
sts = get_ip_by_host(route->url->host, &addr1);
if (get_ip_by_ifname(configuration.inbound_if, &addr2) != STS_SUCCESS) {
ERROR("can't find inbound interface %s - configuration error?",
configuration.inbound_if);
return STS_FAILURE;
}
if (get_ip_by_ifname(configuration.outbound_if, &addr3)!= STS_SUCCESS) {
ERROR("can't find outbound interface %s - configuration error?",
configuration.outbound_if);
return STS_FAILURE;
}
/* my own route header? */
if ((sts == STS_SUCCESS) &&
((memcmp(&addr1, &addr2, sizeof(addr1)) == 0) ||
(memcmp(&addr1, &addr3, sizeof(addr1)) == 0)) &&
(route->url->port ?
configuration.sip_listen_port == atoi(route->url->port):
configuration.sip_listen_port == SIP_PORT)) {
osip_list_remove(request->routes, 0);
osip_route_free(route);
/* request->routes will be freed by osip_message_free() */
DEBUGC(DBCLASS_PROXY, "removed Route header pointing to myself");
}
}
route_preprocess(ticket);
/*
* figure out whether this is an incoming or outgoing request
@@ -240,7 +189,7 @@ int proxy_request (sip_ticket_t *ticket) {
}
}
#endif
ticket->direction=type;
/*
* logging of passing calls
@@ -446,63 +395,19 @@ int proxy_request (sip_ticket_t *ticket) {
#if 0
/* NOT IMPLEMENTED - this requires proper implementation of
the Route headers first. */
{
struct in_addr addr;
osip_record_route_t *r_route;
osip_uri_t *uri_of_proxy;
/*
* get the IP address of the interface where I'm going to
* send out this request
*/
switch (type) {
case REQTYP_INCOMING:
if (get_ip_by_ifname(configuration.inbound_if, &addr) != STS_SUCCESS) {
ERROR("can't find inbound interface %s - configuration error?",
configuration.inbound_if);
return STS_FAILURE;
}
break;
case REQTYP_OUTGOING:
if (get_ip_by_ifname(configuration.outbound_if, &addr) != STS_SUCCESS) {
ERROR("can't find outbound interface %s - configuration error?",
configuration.outbound_if);
return STS_FAILURE;
}
break;
default:
ERROR("Oops, never should end up here (type=%i)", type);
return STS_FAILURE;
}
sts = osip_record_route_init(&r_route);
if (sts == 0) {
sts = osip_uri_init(&uri_of_proxy);
if (sts == 0) {
char tmp[8];
/* host name / IP */
osip_uri_set_host(uri_of_proxy, osip_strdup(utils_inet_ntoa(addr)));
/* port number */
sprintf(tmp, "%i", configuration.sip_listen_port);
osip_uri_set_port(uri_of_proxy, osip_strdup(tmp));
/* 'lr' parameter */
osip_uri_uparam_add(uri_of_proxy, "lr", NULL);
osip_record_route_set_url(r_route, uri_of_proxy);
/* insert before all other record-route */
osip_list_add (request->record_routes, r_route, 0);
} else {
osip_record_route_free (r_route);
osip_free (r_route);
} /* if url_init */
} /* if record route init */
}
route_add_recordroute(ticket);
#endif
/*
* for incoming requests that DO include a Record-Route header,
* include my own as well. The local UA will probably send its answer
* to the topmost Route Header (8.1.2 of RFC3261)
*/
if ((type == REQTYP_INCOMING) &&
(request->record_routes) &&
(!osip_list_eol(request->record_routes, 0))) {
DEBUGC(DBCLASS_PROXY,"Adding my Record-Route");
route_add_recordroute(ticket);
}
/*
* RFC 3261, Section 16.6 step 5
@@ -528,46 +433,16 @@ int proxy_request (sip_ticket_t *ticket) {
* header field.
*/
#if 0
/* we are not a real proxy - and from the outside we look like an UA.
So we should not fiddle around with the Route headers.
We should use the first Route header to send the packet to
(RFC3261, section 8.1.2) */
if (request->routes && !osip_list_eol(request->routes, 0)) {
osip_route_t *route=NULL;
osip_uri_param_t *param=NULL;
route = (osip_route_t *) osip_list_get(request->routes, 0);
if (route->url) {
/* check for non existing lr parameter */
if (osip_uri_uparam_get_byname(route->url, "lr", &param) != 0) {
osip_route_t *new_route=NULL;
url=osip_message_get_uri(request);
/* push Request URI into Route header list at the last position */
osip_route_init(&new_route);
osip_uri_clone(url, &new_route->url);
osip_list_add(request->routes, new_route, -1);
/* rewrite request URI to now topmost Route header */
DEBUGC(DBCLASS_PROXY, "Route header w/o 'lr': rewriting request "
"URI from %s to %s", url->host, route->url->host);
osip_uri_free(url);
url=NULL;
osip_uri_clone(route->url, &url);
/* remove first Route header from list & free */
osip_list_remove(request->routes, 0);
osip_route_free(route);
route = NULL;
}
}
}
route_postprocess(ticket);
#endif
/*
* RFC 3261, Section 16.6 step 7
* Proxy Behavior - Determine Next-Hop Address
*/
/*
* fixed outbound proxy defined ?
*/
if ((type == REQTYP_OUTGOING) && (configuration.outbound_proxy_host)) {
/* I have an outbound proxy configured */
sts = get_ip_by_host(configuration.outbound_proxy_host, &sendto_addr);
@@ -584,31 +459,22 @@ We should use the first Route header to send the packet to
}
DEBUGC(DBCLASS_PROXY, "proxy_request: have outbound proxy %s:%i",
configuration.outbound_proxy_host, port);
/*
* Route present?
* If so, fetch address from topmost Route: header and remove it.
*/
} else if ((type == REQTYP_OUTGOING) &&
(request->routes && !osip_list_eol(request->routes, 0))) {
/* get the destination from the Route Header */
osip_route_t *route=NULL;
route = (osip_route_t *) osip_list_get(request->routes, 0);
if (route==NULL || route->url==NULL || route->url->host==NULL) {
DEBUGC(DBCLASS_PROXY, "proxy_request: got broken Route header "
"- discarding packet");
return STS_FAILURE;
}
sts = get_ip_by_host(route->url->host, &sendto_addr);
sts=route_determine_nexthop(ticket, &sendto_addr, &port);
if (sts == STS_FAILURE) {
DEBUGC(DBCLASS_PROXY, "proxy_request: cannot resolve Route URI [%s]",
route->url->host);
DEBUGC(DBCLASS_PROXY, "proxy_request: route_determine_nexthop failed");
return STS_FAILURE;
}
if (route->url->port) {
port=atoi(route->url->port);
} else {
port=SIP_PORT;
}
DEBUGC(DBCLASS_PROXY, "proxy_request: have Route header to %s:%i",
route->url->host, port);
utils_inet_ntoa(sendto_addr), port);
/*
* destination from SIP URI
*/
} else {
/* get the destination from the SIP URI */
sts = get_ip_by_host(url->host, &sendto_addr);
@@ -680,6 +546,20 @@ We should use the first Route header to send the packet to
* RETURNS
* STS_SUCCESS on success
* STS_FAILURE on error
* RFC3261
* Section 16.7: Proxy Behavior - Response Processing
* 1. Find the appropriate response context
* 2. Update timer C for provisional responses
* 3. Remove the topmost Via
* 4. Add the response to the response context
* 5. Check to see if this response should be forwarded immediately
* 6. When necessary, choose the best final response from the
* response context
* 7. Aggregate authorization header field values if necessary
* 8. Optionally rewrite Record-Route header field values
* 9. Forward the response
* 10. Generate any necessary CANCEL requests
*
*/
int proxy_response (sip_ticket_t *ticket) {
int i;
@@ -692,9 +572,6 @@ int proxy_response (sip_ticket_t *ticket) {
osip_message_t *response;
struct sockaddr_in *from;
#define RESTYP_INCOMING 1
#define RESTYP_OUTGOING 2
DEBUGC(DBCLASS_PROXY,"proxy_response");
if (ticket==NULL) {
@@ -706,8 +583,8 @@ int proxy_response (sip_ticket_t *ticket) {
from=&ticket->from;
/*
* RFC 3261, Section 16.11
* Proxy Behavior - Remove my Via header field value
* RFC 3261, Section 16.7 step 3
* Proxy Behavior - Response Processing - Remove my Via header field value
*/
/* remove my Via header line */
sts = sip_del_myvia(ticket);
@@ -765,10 +642,10 @@ int proxy_response (sip_ticket_t *ticket) {
if (urlmap[i].active == 0) continue;
if (get_ip_by_host(urlmap[i].true_url->host, &tmp_addr) == STS_FAILURE) {
DEBUGC(DBCLASS_PROXY, "proxy_request: cannot resolve host [%s]",
DEBUGC(DBCLASS_PROXY, "proxy_response: cannot resolve host [%s]",
urlmap[i].true_url);
} else {
DEBUGC(DBCLASS_PROXY, "proxy_request: reghost:%s ip:%s",
DEBUGC(DBCLASS_PROXY, "proxy_response: reghost:%s ip:%s",
urlmap[i].true_url->host, utils_inet_ntoa(from->sin_addr));
if (memcmp(&tmp_addr, &from->sin_addr, sizeof(tmp_addr)) == 0) {
type=RESTYP_OUTGOING;
@@ -790,7 +667,7 @@ int proxy_response (sip_ticket_t *ticket) {
}
}
#endif
ticket->direction=type;
/*
* ok, we got a response that we are allowed to process.
@@ -854,7 +731,7 @@ int proxy_response (sip_ticket_t *ticket) {
(osip_strncasecmp(ua_hdr->hvalue,"grandstream", 11)==0) &&
(MSG_IS_RESPONSE_FOR(response,"SUBSCRIBE")) &&
(MSG_TEST_CODE(response, 202))) {
DEBUGC(DBCLASS_PROXY, "proxy_request: Grandstream hack 202->404");
DEBUGC(DBCLASS_PROXY, "proxy_response: Grandstream hack 202->404");
response->status_code=404;
}
}
@@ -891,6 +768,18 @@ int proxy_response (sip_ticket_t *ticket) {
return STS_FAILURE;
}
/*
* for incoming requests that DO include a Record-Route header,
* include my own as well. The local UA will probably send its answer
* to the topmost Route Header (8.1.2 of RFC3261)
*/
if ((type == RESTYP_INCOMING) &&
(response->record_routes) &&
(!osip_list_eol(response->record_routes, 0))) {
DEBUGC(DBCLASS_PROXY,"Adding my Record-Route");
route_add_recordroute(ticket);
}
/*
* check if we need to send to an outbound proxy
*/
@@ -898,7 +787,7 @@ int proxy_response (sip_ticket_t *ticket) {
/* have an outbound proxy - use it to send the packet */
sts = get_ip_by_host(configuration.outbound_proxy_host, &sendto_addr);
if (sts == STS_FAILURE) {
DEBUGC(DBCLASS_PROXY, "proxy_request: cannot resolve outbound "
DEBUGC(DBCLASS_PROXY, "proxy_response: cannot resolve outbound "
" proxy host [%s]", configuration.outbound_proxy_host);
return STS_FAILURE;
}
@@ -908,6 +797,19 @@ int proxy_response (sip_ticket_t *ticket) {
} else {
port = SIP_PORT;
}
/*
* Route present?
* If so, fetch address from topmost Route: header and remove it.
*/
} else if ((type == RESTYP_OUTGOING) &&
(response->routes && !osip_list_eol(response->routes, 0))) {
sts=route_determine_nexthop(ticket, &sendto_addr, &port);
if (sts == STS_FAILURE) {
DEBUGC(DBCLASS_PROXY, "proxy_response: route_determine_nexthop failed");
return STS_FAILURE;
}
DEBUGC(DBCLASS_PROXY, "proxy_response: have Route header to %s:%i",
utils_inet_ntoa(sendto_addr), port);
} else {
/* get target address and port from VIA header */
via = (osip_via_t *) osip_list_get (response->vias, 0);
src/route_processing.c
+319
View File
@@ -0,0 +1,319 @@
/* -*- Mode: C; c-basic-offset: 3 -*-
Copyright (C) 2002 Thomas Ries <tries@gmx.net>
This file is part of Siproxd.
Siproxd 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.
Siproxd 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 Siproxd; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <osipparser2/osip_parser.h>
#include <osipparser2/sdp_message.h>
#include "siproxd.h"
#include "log.h"
static char const ident[]="$Id$";
/* configuration storage */
extern struct siproxd_config configuration; /* defined in siproxd.c */
/*
* PROXY_PREPROCESS_ROUTE
*
* Route Information Preprocessing
*
* RETURNS
* STS_SUCCESS on success
*/
int route_preprocess(sip_ticket_t *ticket){
osip_message_t *mymsg=ticket->sipmsg;
int sts;
struct in_addr addr1, addr2, addr3;
osip_route_t *route;
int last;
int i, j;
/*
The proxy MUST inspect the Request-URI of the request. If the
Request-URI of the request contains a value this proxy previously
placed into a Record-Route header field (see Section 16.6 item 4),
the proxy MUST replace the Request-URI in the request with the last
value from the Route header field, and remove that value from the
Route header field. The proxy MUST then proceed as if it received
this modified request.
*/
/*
* Check if I am listed at the topmost Route header (if any Route
* header is existing at all). If so, remove it from the list and
* rewrite the request URI to point to the now topmost Route.
*/
if (mymsg->routes && !osip_list_eol(mymsg->routes, 0)) {
last=osip_list_size(mymsg->routes)-1;
/*
* I have seen that some (all?) UAs do set a Route: header
* pointing to myself AT THE END OF THE LIST!
* I don't really understand why, reading the Routing parts
* of the RFC3261 did not help. All I know is, this last Route
* header must be removed, otherwise any remote Proxy/Server
* in the path will try to forward the packet to our private net.
*
* so the quick and dirty HACK is to check the topmost and
* the last Route entry if it belongs to me...
*
* Any proper explanation to this is heavily welcome
*/
for (j=0,i=last; j<2; j++, i=0) {
DEBUGC(DBCLASS_PROXY, "route_preprocess: checking Route "
"header[%i]", i);
route = (osip_route_t *) osip_list_get(mymsg->routes, i);
sts = get_ip_by_host(route->url->host, &addr1);
if (get_ip_by_ifname(configuration.inbound_if, &addr2) != STS_SUCCESS) {
ERROR("can't find inbound interface %s - configuration error?",
configuration.inbound_if);
return STS_FAILURE;
}
if (get_ip_by_ifname(configuration.outbound_if, &addr3)!= STS_SUCCESS) {
ERROR("can't find outbound interface %s - configuration error?",
configuration.outbound_if);
return STS_FAILURE;
}
/* my own route header? */
if ((sts == STS_SUCCESS) &&
((memcmp(&addr1, &addr2, sizeof(addr1)) == 0) ||
(memcmp(&addr1, &addr3, sizeof(addr1)) == 0)) &&
(route->url->port ?
configuration.sip_listen_port == atoi(route->url->port):
configuration.sip_listen_port == SIP_PORT)) {
osip_list_remove(mymsg->routes, i);
osip_route_free(route);
/* request->routes will be freed by osip_message_free() */
DEBUGC(DBCLASS_PROXY, "removed Route header pointing to myself");
}
}
}
return STS_SUCCESS;
}
/*
* PROXY_POSTPROCESS_ROUTE
*
* Route Information Postprocessing
*
* RETURNS
* STS_SUCCESS on success
*/
int route_postprocess(sip_ticket_t *ticket){
osip_message_t *mymsg=ticket->sipmsg;
osip_uri_t *url;
osip_route_t *route=NULL;
osip_uri_param_t *param=NULL;
/*
* RFC 3261, Section 16.6 step 6
* Proxy Behavior - Request Forwarding - Postprocess routing information
*
* If the copy contains a Route header field, the proxy MUST
* inspect the URI in its first value. If that URI does not
* contain an lr parameter, the proxy MUST modify the copy as
* follows:
*
* - The proxy MUST place the Request-URI into the Route header
* field as the last value.
*
* - The proxy MUST then place the first Route header field value
* into the Request-URI and remove that value from the Route
* header field.
*/
/* we are not a real proxy - and from the outside we look like an UA.
So we should not fiddle around with the Route headers.
We should use the first Route header to send the packet to
(RFC3261, section 8.1.2) */
if (mymsg->routes && !osip_list_eol(mymsg->routes, 0)) {
route = (osip_route_t *) osip_list_get(mymsg->routes, 0);
if (route->url) {
/* check for non existing lr parameter */
if (osip_uri_uparam_get_byname(route->url, "lr", &param) != 0) {
osip_route_t *new_route=NULL;
url=osip_message_get_uri(mymsg);
/* push Request URI into Route header list at the last position */
osip_route_init(&new_route);
osip_uri_clone(url, &new_route->url);
osip_list_add(mymsg->routes, new_route, -1);
/* rewrite request URI to now topmost Route header */
DEBUGC(DBCLASS_PROXY, "Route header w/o 'lr': rewriting request "
"URI from %s to %s", url->host, route->url->host);
osip_uri_free(url);
url=NULL;
osip_uri_clone(route->url, &url);
/* remove first Route header from list & free */
osip_list_remove(mymsg->routes, 0);
osip_route_free(route);
route = NULL;
}
}
}
return STS_SUCCESS;
}
/*
* PROXY_ADD_RECORDROUTE
*
* Add a Record-route header
*
* RETURNS
* STS_SUCCESS on success
*/
int route_add_recordroute(sip_ticket_t *ticket){
osip_message_t *mymsg=ticket->sipmsg;
int sts;
struct in_addr addr;
osip_record_route_t *r_route;
osip_uri_t *uri_of_proxy;
/*
* RFC 3261, Section 16.6 step 4
* Proxy Behavior - Request Forwarding - Add a Record-route header
*/
/*
* get the IP address of the interface where I'm going to
* send out this request
*/
switch (ticket->direction) {
case REQTYP_INCOMING:
case RESTYP_INCOMING:
if (get_ip_by_ifname(configuration.inbound_if, &addr) != STS_SUCCESS) {
ERROR("can't find inbound interface %s - configuration error?",
configuration.inbound_if);
return STS_FAILURE;
}
break;
case REQTYP_OUTGOING:
case RESTYP_OUTGOING:
if (get_ip_by_ifname(configuration.outbound_if, &addr) != STS_SUCCESS) {
ERROR("can't find outbound interface %s - configuration error?",
configuration.outbound_if);
return STS_FAILURE;
}
break;
default:
ERROR("Oops, never should end up here (direction=%i)", ticket->direction);
return STS_FAILURE;
}
sts = osip_record_route_init(&r_route);
if (sts == 0) {
sts = osip_uri_init(&uri_of_proxy);
if (sts == 0) {
char tmp[8];
/* host name / IP */
osip_uri_set_host(uri_of_proxy, osip_strdup(utils_inet_ntoa(addr)));
osip_uri_set_username(uri_of_proxy, osip_strdup("siproxd"));
/* port number */
sprintf(tmp, "%i", configuration.sip_listen_port);
osip_uri_set_port(uri_of_proxy, osip_strdup(tmp));
/* 'lr' parameter */
osip_uri_uparam_add(uri_of_proxy, "lr", NULL);
osip_record_route_set_url(r_route, uri_of_proxy);
/* insert before all other record-route */
osip_list_add (mymsg->record_routes, r_route, 0);
} else {
osip_record_route_free (r_route);
osip_free (r_route);
} /* if url_init */
} /* if record route init */
return STS_SUCCESS;
}
/*
* PROXY_DETERMINE_NEXT_HOP
*
* check if a route-header exists and give back the next hop
*
* RETURNS
* STS_SUCCESS on success
*/
int route_determine_nexthop(sip_ticket_t *ticket,
struct in_addr *dest, int *port){
int sts;
osip_message_t *mymsg=ticket->sipmsg;
osip_route_t *route=NULL;
/*
* Check for existing route header. If so, the topmost will be
* the next hop.
*
* If this route header does NOT have a lr parameter set, rewrite
* the SIP URI to point to the destination of the route (NOT IMPLEMENTED)
*/
if (mymsg->routes && !osip_list_eol(mymsg->routes, 0)) {
route = (osip_route_t *) osip_list_get(mymsg->routes, 0);
/* get the destination from the Route Header */
route = (osip_route_t *) osip_list_get(mymsg->routes, 0);
if (route==NULL || route->url==NULL || route->url->host==NULL) {
DEBUGC(DBCLASS_PROXY, "route_determine_nexthop: got broken Route "
"header - discarding packet");
return STS_FAILURE;
}
sts = get_ip_by_host(route->url->host, dest);
if (sts == STS_FAILURE) {
DEBUGC(DBCLASS_PROXY, "route_determine_nexthop: cannot resolve "
"Route URI [%s]", route->url->host);
return STS_FAILURE;
}
if (route->url->port) {
*port=atoi(route->url->port);
} else {
*port=SIP_PORT;
}
osip_list_remove(mymsg->routes, 0);
osip_route_free(route);
/* request->routes will be freed by osip_message_free() */
}
return STS_SUCCESS;
}
src/siproxd.h
+13 -1
View File
@@ -93,6 +93,11 @@ typedef struct {
#define PROTO_UDP 1
#define PROTO_TCP 2
int protocol; /* received by protocol */
#define REQTYP_INCOMING 1
#define REQTYP_OUTGOING 2
#define RESTYP_INCOMING 3
#define RESTYP_OUTGOING 4
int direction; /* direction as determined by proxy */
} sip_ticket_t;
@@ -123,7 +128,14 @@ int register_response(sip_ticket_t *ticket, int flag); /*X*/
int proxy_request (sip_ticket_t *ticket); /*X*/
int proxy_response (sip_ticket_t *ticket); /*X*/
int proxy_rewrite_invitation_body(osip_message_t *m, int direction); /*X*/
int proxy_rewrite_request_uri(osip_message_t *mymsg, int idx); /*X*/
int proxy_rewrite_request_uri(osip_message_t *mymsg, int idx); /*X*/
/* route_preprocessing.c */
int route_preprocess(sip_ticket_t *ticket); /*X*/
int route_add_recordroute(sip_ticket_t *ticket); /*X*/
int route_postprocess(sip_ticket_t *ticket); /*X*/
int route_determine_nexthop(sip_ticket_t *ticket,
struct in_addr *dest, int *port); /*X*/
/* utils.c */
int get_ip_by_host(char *hostname, struct in_addr *addr); /*X*/