8.2.2P5 Bugfix for Win2K long interface names

[Michael Beyer]

Version babble:
   BIND 8.2.2-P5 (also applies up to at least 8.2.3-T6B)
   Windows2000 5.00.2195SP1 (may apply to other WinNT versions as well)

Bugfix:

Just a simple buffer overrun in src\port\winnt\libbind\snmpmib.c which can
prevent BIND from using some interfaces.  In Windows2000 interface names may be
longer than IFNAMSIZ (=64).  For example, my "Linksys LNE100TX Fast Ethernet
Adapter (LNE100TX v4) NDIS5 Driver" is 65 characters long.  Limit the data
memcpy'ed into ifd->if_name to make sure that any extra characters won't
overrun into the family field:

	/* Get the interface name */
	len = 0;
	/* Why do we do this?
	 * Because there are often nonprintable chars in this string for some reason.
	 * So we scan the string to get only the printable portion.
	 */
-->	while((len < ifInfoBind[IF_NAME].value.asnValue.string.length) && (len < (IFNAMSIZ-1)))
	{
		c = ifInfoBind[IF_NAME].value.asnValue.string.stream[len];
		if(c < 0x20 || c > 0x7E)
			break;
		len++;
	}
	memcpy(ifd->if_name, ifInfoBind[IF_NAME].value.asnValue.string.stream, len);


-- Michael Beyer
   Darkstreak Consulting