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#ifndef __FINDIFACE_H
#define __FINDIFACE_H
#include "SNMPeer.h"
#include "SNMPExtDLL.h"
#include "SNMPOIDs.h"
namespace Klever {
inline BOOL FindIFace(in_addr& target,in_addr& source)
{
DEFINE_OID(ipRouteDest, OIDipRouteDest);
DEFINE_OID(ipRouteMask, OIDipRouteMask);
DEFINE_OID(ipRouteIfIndex, OIDipRouteIfIndex);
DEFINE_OID(ipRouteMetric1, OIDipRouteMetric1);
DEFINE_OID(ipAdEntIfIndex, OIDipAdEntIfIndex);
DEFINE_OID(ipAdEntAddr, OIDipAdEntAddr);
struct _route {
int iface;
int metric;
DWORD nm;
} routes[16];
int nRoutes = 0;
CSNMPVarBindList vbl;
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipRouteDest,sizeof(ipRouteDest))));
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipRouteMask,sizeof(ipRouteMask))));
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipRouteIfIndex,sizeof(ipRouteIfIndex))));
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipRouteMetric1,sizeof(ipRouteMetric1))));
CSNMPExtDLL snmp("INETMIB1");
while(nRoutes<(sizeof(routes)/sizeof(routes[0]))){
if(
snmp.Request(CASNAny::typeASNGetNextRequest,vbl,vbl)
&& vbl.GetCount() == 4
){
POSITION p = vbl.GetHeadPosition();
_route r = {-1,-1};
in_addr d, m;
BOOL bD = FALSE, bM = FALSE;
while(p){
CSNMPVarBind& vb = vbl.GetNext(p);
if(
vb.IsName(ipRouteDest,sizeof(ipRouteDest))
&& vb.value.type==CASNAny::typeASNIP
){
d.s_addr=vb.value.value.ip.s_addr; bD = TRUE;
}else if(
vb.IsName(ipRouteMask,sizeof(ipRouteMask))
&& vb.value.type==CASNAny::typeASNIP
){
m.s_addr=vb.value.value.ip.s_addr; bM = TRUE;
}else if(
vb.IsName(ipRouteIfIndex,sizeof(ipRouteIfIndex))
&& vb.value.type==CASNAny::typeASNInteger
){
r.iface=vb.value.value.number;
}else if(
vb.IsName(ipRouteMetric1,sizeof(ipRouteMetric1))
&& vb.value.type==CASNAny::typeASNInteger
){
r.metric=vb.value.value.number;
}else
break;
}
if(r.iface<0 || r.metric<0 || (!bD) || (!bM))
break;
if((target.s_addr&m.s_addr)==(d.s_addr&m.s_addr)){
r.nm=htonl(m.s_addr);
memmove(&routes[nRoutes++],&r,sizeof(routes[0]));
}
}else
break;
}
if(!nRoutes)
return FALSE;
int rn = 0;
if(nRoutes>1){
for(int tmp=1;tmp<nRoutes;tmp++)
if(
routes[tmp].metric<routes[rn].metric
|| routes[tmp].nm>routes[rn].nm
)
rn = tmp;
}
int iface = routes[rn].iface;
vbl.RemoveAll();
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipAdEntAddr,sizeof(ipAdEntAddr))));
vbl.AddTail(CSNMPVarBind(CASNAny(CASNAny::typeASNOID,ipAdEntIfIndex,sizeof(ipAdEntIfIndex))));
for(;;){
if(
snmp.Request(CASNAny::typeASNGetNextRequest,vbl,vbl)
&& vbl.GetCount()==2
){
in_addr a; a.s_addr = INADDR_NONE;
int ifn = -1;
POSITION p = vbl.GetHeadPosition();
while(p){
CSNMPVarBind& vb = vbl.GetNext(p);
if(
vb.IsName(ipAdEntAddr,sizeof(ipAdEntAddr))
&& vb.value.type==CASNAny::typeASNIP
){
a.s_addr=vb.value.value.ip.s_addr;
}else if(
vb.IsName(ipAdEntIfIndex,sizeof(ipAdEntIfIndex))
&& vb.value.type==CASNAny::typeASNInteger
){
ifn = vb.value.value.number;
}else
break;
}
if(ifn<0)
break;
if(ifn==iface){
source.s_addr=a.s_addr;
return TRUE;
}
}else
break;
}
return FALSE;
}
};
#endif // __FINDIFACE_H
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