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/* $Id: icmp_dummy.c,v 1.2 1999/10/11 05:25:19 fgouget Exp $ */
/* was in */
int do_probe(handle, target, size, ttl, probe)
{
#ifdef FAKE_NET
if ((SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b1==192) &&
(SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b2==168)) {
struct sockaddr_in* itarget=SOCKADDR_IN(target);
int retcode;
/* Fake the probe results according to the target address */
if (ttl==0) {
/* Fake information concerning the local host */
probe->rtt=10*size/100;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
probe->type=ICMP_TIMXCEED;
probe->subtype=ICMP_TIMXCEED_INTRANS;
retcode=BP_RES_TTL_EXCEEDED;
} else if (ttl>=itarget->sin_addr.S_un.S_un_b.s_b4) {
/* Fake information concerning the target host */
probe->rtt=((double)itarget->sin_addr.S_un.S_un_b.s_b3)*itarget->sin_addr.S_un.S_un_b.s_b4*size/100;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_addr=itarget->sin_addr.S_un.S_addr;
probe->type=ICMP_ECHOREPLY;
probe->subtype=0;
retcode=BP_RES_HIT;
} else {
/* Do as if the ttl expired in transit */
probe->rtt=((double)itarget->sin_addr.S_un.S_un_b.s_b3)*ttl*size/100;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_addr=itarget->sin_addr.S_un.S_addr;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_un_b.s_b4=ttl;
probe->type=ICMP_TIMXCEED;
probe->subtype=ICMP_TIMXCEED_INTRANS;
retcode=BP_RES_TTL_EXCEEDED;
}
probe->src_addr.sa_family=AF_INET;
probe->size=0;
probe->contents=NULL;
return retcode;
} else if ((SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b1==208) &&
(SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b2==199) &&
(SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b3==87) &&
(SOCKADDR_IN(target)->sin_addr.S_un.S_un_b.s_b4==55)) {
/* Fake information concerning the local host */
probe->rtt=size/1000;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
probe->type=ICMP_ECHOREPLY;
probe->subtype=0;
return BP_RES_HIT;
} else {
probe->rtt=50;
probe->src_addr.sa_family=AF_INET;
SOCKADDR_IN(&probe->src_addr)->sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
probe->type=ICMP_UNREACH;
probe->subtype=ICMP_UNREACH_NET_UNKNOWN;
probe->size=0;
probe->contents=NULL;
return BP_RES_UNKNOWN;
}
#endif /* FAKE_NET */
}
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