DeforaNetworks/siproxd
DeforaNetworks/siproxd
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- Route processing changes

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This commit is contained in:
Thomas Ries 2004-10-31 17:09:34 +00:00
parent e4d4e14d26
commit 5ba273191c
1 changed files with 94 additions and 72 deletions
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166
src/route_processing.c
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@ -52,83 +52,109 @@ extern struct siproxd_config configuration; /* defined in siproxd.c */
int route_preprocess(sip_ticket_t *ticket){
osip_message_t *mymsg=ticket->sipmsg;
int sts;
osip_uri_t *url;
int dest_port;
int last;
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.
*/
osip_uri_param_t *param=NULL;
if ((mymsg->routes==NULL) || (osip_list_size(mymsg->routes)<=0)) {
DEBUGC(DBCLASS_PROXY, "route_preprocess: no Route header present");
return STS_SUCCESS;
}
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;
}
/*
* 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.
* 16.4 Route Information Preprocessing:
* 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.
*/
if (mymsg->routes && (osip_list_size(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
*
* &&&&
* 23Oct2004/xar
* Of course this was a stupid error of siproxd himself
* when adding Record-Route headers...
* - Request: add Record-Route header as top element of list
* - Response: add Record-Route header as last element of list
* So this code should be cleaned up - and only examine the first
* entry in the Record-set.
*/
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);
if (route == NULL) continue;
if (route->url == NULL) continue;
if (route->url->host == NULL) continue;
url = osip_message_get_uri(mymsg);
dest_port= (url->port)?atoi(url->port):SIP_PORT;
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;
if (get_ip_by_host(url->host, &addr1) == STS_SUCCESS) {
if ((configuration.sip_listen_port == dest_port) &&
(url->username && (strcmp(url->username,"siproxd")==0)) &&
((memcmp(&addr1, &addr2, sizeof(addr1)) == 0) ||
(memcmp(&addr1, &addr3, sizeof(addr1)) == 0))) {
/* Request URI points does to myself */
DEBUGC(DBCLASS_PROXY, "request URI [%s@%s:%i] points to myself",
(url->username)?url->username:"*NULL*",
(url->host)?url->host:"*NULL*",
(url->port)?atoi(url->port):SIP_PORT);
/* get last route in list */
last=osip_list_size(mymsg->routes)-1;
route = (osip_route_t *) osip_list_get(mymsg->routes, last);
DEBUGC(DBCLASS_PROXY, "moving last Route [%s@%s:%i] to URI",
(route->url->username)?route->url->username:"*NULL*",
(route->url->host)?route->url->host:"*NULL*",
(route->url->port)?atoi(route->url->port):SIP_PORT);
/* issue warning if the Route I'm going to fetch is NOT
a strict router (lr parameter not present) - something is fishy */
if (osip_uri_uparam_get_byname(route->url, "lr", &param) == 0) {
WARN("Fixup Strict Router: Route entry [%s@%s:%i] is not "
"a strict Router!",
(route->url->username)?route->url->username:"*NULL*",
(route->url->host)?route->url->host:"*NULL*",
(route->url->port)?atoi(route->url->port):SIP_PORT);
}
/* 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");
}
/* rewrite request URI */
osip_uri_free(url);
osip_uri_clone(route->url, &(mymsg->req_uri));
/* remove from list */
osip_list_remove(mymsg->routes, last);
osip_route_free(route);
}
} else {
WARN("cannot resolve host in Request URI [%s]", url->host);
}
/*
* 16.4 Route Information Preprocessing:
* If the first value in the Route header field indicates this proxy,
* the proxy MUST remove that value from the request.
*/
DEBUGC(DBCLASS_PROXY, "route_preprocess: checking topmost "
"Route header");
route = (osip_route_t *) osip_list_get(mymsg->routes, 0);
if ((route != NULL) && (route->url != NULL) &&
(route->url->host != NULL)) {
sts = get_ip_by_host(route->url->host, &addr1);
/* 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, 0);
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;
}
@ -163,10 +189,6 @@ int route_postprocess(sip_ticket_t *ticket){
* 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)) {
@ -289,7 +311,7 @@ int route_add_recordroute(sip_ticket_t *ticket){
/*
* PROXY_PURGE_RECORDROUTE
*
* Purge all Record-route headers
* Purge Record-Route headers pointing to myself.
*
* RETURNS
* STS_SUCCESS on success