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little rDNS fix from Doug

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fyodor
2006-08-08 22:50:15 +00:00
parent 2d36c91639
commit 71ac6ae95a
3 changed files with 22 additions and 6 deletions
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7
nmap_dns.cc
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@@ -674,9 +674,10 @@ static void read_evt_handler(nsock_pool nsp, nsock_event evt, void *nothing) {
// 0xFA == 11111010 (we're not concerned with AA or RD bits)
if ((buf[2] & 0xFA) != 0x80) return;
// Check that Recursion is available, the zero field is all zeros
// and there is no error condition:
if (buf[3] != 0x80) {
// Check that the zero field is all zeros and there is no error condition.
// We don't care if recursion is available or not since we might be querying
// an authoritative DNS server.
if (buf[3] != 0x80 && buf[3] != 0) {
if ((buf[3] & 0xF) == 2) errcode = 2;
else if ((buf[3] & 0xF) == 3) errcode = 3;
else return;