routing.h File Reference

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Detailed Description

CDiameterPeer Realm Routing.

Author:

Dragos Vingarzan vingarzan -at- fokus dot fraunhofer dot de

Definition in file routing.h.

#include "peer.h"
#include "diameter.h"
#include "utils.h"

Go to the source code of this file.

Functions
peer *	get_routing_peer (AAAMessage *m)
	Get the first connect peer that matches the routing mechanisms.

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Function Documentation

peer* get_routing_peer

(

AAAMessage *

m

)

Get the first connect peer that matches the routing mechanisms.

• First the Destination-Host AVP value is tried if connected (the peer does not have to be in the routing table at all).
• Then we look for a connected peer in the specific realm for the Destination-Realm AVP
• Then we look for the first connected peer in the default routes

  Parameters:

  m

  - the Diameter message to find the destination peer for

  Returns:

  - the connected peer or null if none connected found

Definition at line 102 of file routing.c.

References AAA_FORWARD_SEARCH, AAAFindMatchingAVP(), AAAFindMatchingAVPList(), AAAFreeAVPList(), AAAUngroupAVPS(), _message_t::applicationId, AVP_Acct_Application_Id, AVP_Auth_Application_Id, AVP_Destination_Host, AVP_Destination_Realm, AVP_Vendor_Id, AVP_Vendor_Specific_Application_Id, config, avp::data, get_4bytes, get_first_connected_route(), get_peer_by_fqdn(), _avp_list_t::head, I_Open, _routing_realm::next, peer_handles_application(), R_Open, dp_config::r_table, _routing_realm::realm, routing_table::realms, routing_table::routes, _routing_realm::routes, and _peer_t::state.

Referenced by AAASendMessage(), and AAASendRecvMessage().

{
    str destination_realm={0,0},destination_host={0,0};
    AAA_AVP *avp,*avp_vendor,*avp2;
    AAA_AVP_LIST group; 
    peer *p;
    routing_realm *rr;
    int app_id=0,vendor_id=0;
    
    app_id = m->applicationId;
    avp = AAAFindMatchingAVP(m,0,AVP_Vendor_Specific_Application_Id,0,AAA_FORWARD_SEARCH);
    if (avp){
        group = AAAUngroupAVPS(avp->data);
        avp_vendor = AAAFindMatchingAVPList(group,group.head,AVP_Vendor_Id,0,0);                
        avp2 = AAAFindMatchingAVPList(group,group.head,AVP_Auth_Application_Id,0,0);                
        if (avp_vendor&&avp2){
            vendor_id = get_4bytes(avp_vendor->data.s);
            app_id = get_4bytes(avp2->data.s);
        }
        avp2 = AAAFindMatchingAVPList(group,group.head,AVP_Acct_Application_Id,0,0);                
        if (avp_vendor&&avp2){
            vendor_id = get_4bytes(avp_vendor->data.s);
            app_id = get_4bytes(avp2->data.s);
        }
        AAAFreeAVPList(&group);
    }

    avp = AAAFindMatchingAVP(m,0,AVP_Destination_Host,0,AAA_FORWARD_SEARCH);
    if (avp) destination_host = avp->data;
    
    if (destination_host.len){
        /* There is a destination host present in the message try and route directly there */
        p = get_peer_by_fqdn(&destination_host);
        if (p && (p->state==I_Open || p->state==R_Open) && peer_handles_application(p,app_id,vendor_id)) return p;
        /* the destination host peer is not connected at the moment, try a normal route then */
    }
    
    avp = AAAFindMatchingAVP(m,0,AVP_Destination_Realm,0,AAA_FORWARD_SEARCH);
    if (avp) destination_realm = avp->data;
    
    if (!config->r_table) {
        LOG(L_ERR,"ERROR:get_routing_peer(): Empty routing table.\n");
        return 0;
    }
    
    if (destination_realm.len){
        /* first search for the destination realm */
        for(rr=config->r_table->realms;rr;rr=rr->next)
            if (rr->realm.len == destination_realm.len &&
                strncasecmp(rr->realm.s,destination_realm.s,destination_realm.len)==0)
                    break;
        if (rr) {
            p = get_first_connected_route(rr->routes,app_id,vendor_id);
            if (p) return p;
            else LOG(L_ERR,"ERROR:get_routing_peer(): No connected Route peer found for Realm <%.*s>. Trying DefaultRoutes next...\n",
                    destination_realm.len,destination_realm.s);
        }    
    }
    /* if not found in the realms or no destination_realm, 
     * get the first connected host in default routes */
    p = get_first_connected_route(config->r_table->routes,app_id,vendor_id);
    if (!p){
        LOG(L_ERR,"ERROR:get_routing_peer(): No connected DefaultRoute peer found.\n");
    }
    return p;
}

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