#!/usr/bin/awk -f
# resolv.awk - create Windows resolv.conf from ipconfig /all output

				{ sub( /\r/, "", $NF) }	# trim \r

# collect DNS domain suffixes
/D[Nn][Ss]\sSuffix[^:]*:\s\S/	{ domain[$NF] = $NF }

# collect DNS search suffixes
/Search\sList[^:]*:\s\S/	{ search[$NF] = $NF }

# collect DNS server IP addresses
/DNS\sServers[^:]*:\s\S/	{ dns = 1 }			# enable

dns && $NF ~ /^[0-9.]+$/	{ nameserver[++ns] = $NF }	# collect

dns && $NF !~ /^[0-9.]+$/	{ dns = 0 }			# disable

# output unique resolv.conf entries
END {
    for (n = 1; n <= ns; ++n)	{ print "nameserver", nameserver[n] }

    for (d in domain)		{ print "domain", domain[d] }

    p = "search"

    for (s in search)		{
	printf "%s %s", p, search[s]
	p = ""
    }

    if (!p)			{ print p }
}