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Handle ICMP Time Exceeded messages in scan engine

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DiabloHorn on #nmap noticed that Nmap was ignoring ICMP Time Exceeded
messages while trying to map firewall rules using --ttl.
get_pcap_result() was handling ICMP type 3 (Destination Unreachable),
but not type 11 (Time Exceeded). Now ports that elicit this response
will be marked filtered (to be consistent with existing Connect scan
behavior) and will report time-exceeded from (IP) for the reason.

This was not a common issue, since host discovery already accounted for
it. Port scans would only be affected when skipping host discovery.
This commit is contained in:
dmiller
2013-03-28 21:11:45 +00:00
parent 97c5aa0f0c
commit 43f5db6ce4
1 changed files with 6 additions and 1 deletions
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7
scan_engine.cc
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@@ -4524,7 +4524,7 @@ static bool get_pcap_result(UltraScanInfo *USI, struct timeval *stime) {
if (datalen < 8)
continue;
if (icmp->icmp_type != 3)
if (icmp->icmp_type != 3 && icmp->icmp_type != 11)
continue;
encaps_len = datalen - 8;
@@ -4637,6 +4637,11 @@ static bool get_pcap_result(UltraScanInfo *USI, struct timeval *stime) {
break;
goodone = true;
}
else if (icmp->icmp_type == 11) { /* ICMP Time Exceeded */
newstate = PORT_FILTERED;
current_reason = icmp_to_reason(hdr.proto, icmp->icmp_type, icmp->icmp_code);
goodone = true;
}
}
} else if (hdr.proto == IPPROTO_ICMPV6) {
const void *encaps_data;