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Fix network prefix length on Windows. http://seclists.org/nmap-dev/2016/q2/101

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This commit is contained in:
dmiller 2016-05-11 02:23:21 +00:00
parent 0b28350628
commit 423c8380ef
3 changed files with 50 additions and 0 deletions
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11
libdnet-stripped/src/intf-win32.c
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@ -177,12 +177,23 @@ _adapter_address_to_entry(intf_t *intf, IP_ADAPTER_ADDRESSES *a,
OnLinkPrefixLength member that is stored right with the
unicast address. */
bits = 0;
if (addr->Length >= 48) {
/* "The size of the IP_ADAPTER_UNICAST_ADDRESS structure changed on
* Windows Vista and later. The Length member should be used to determine
* which version of the IP_ADAPTER_UNICAST_ADDRESS structure is being
* used."
* Empirically, 48 is the value on Windows 8.1, so should include the
* OnLinkPrefixLength member.*/
bits = addr->OnLinkPrefixLength;
}
else {
for (prefix = a->FirstPrefix; prefix != NULL; prefix = prefix->Next) {
if (prefix->Address.lpSockaddr->sa_family == addr->Address.lpSockaddr->sa_family) {
bits = (unsigned short) prefix->PrefixLength;
break;
}
}
}
if (entry->intf_addr.addr_type == ADDR_TYPE_NONE) {
/* Set primary address if unset. */