164 lines
3.4 KiB
Bash
164 lines
3.4 KiB
Bash
#!/bin/sh -
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#
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# @(#)mxlookup e07@nikhef.nl (Eric Wassenaar) 950108
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#
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# Author: E.Wassenaar, Nikhef-H
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# Version: 09-OCT-1994
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# Revision: 08-JAN-1995, Make sure servers come from NS records
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#
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# This utility looks up the MX and A records for a given domain name
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# at each of the authoritative servers for the zone it belongs to.
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# The printout shows whether or not the servers have the same notion.
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# Too often mail is bounced with a "No address or MX record" message
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# whereas the mail address is perfectly valid. Usually this happens
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# when one of the servers turns out to be misconfigured and the data
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# was retrieved unfortunately from just that server.
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#
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# With the -t option you can verify resource records of another type
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# at each of the servers. The -v option shows the SOA record and the
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# NS records of the zone to which the given domain name belongs.
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# The -r option disables nameserver recursion at the contacted servers.
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exec=echo
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exec=
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# ----------------------------------------------------------------------
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# Setup environment.
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# ----------------------------------------------------------------------
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# This is where the ``host'' executable lives.
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BINDIR=/usr/local/bin
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PATH=${BINDIR}:/bin:/usr/bin:/usr/ucb ; export PATH
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cmd=`basename $0`
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options="[-v] [-r] [-t type]"
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usage="Usage: $cmd $options name"
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# ----------------------------------------------------------------------
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# Exit codes from <sysexits.h>
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# ----------------------------------------------------------------------
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EX_OK=0
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EX_USAGE=64
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EX_UNAVAILABLE=69
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# ----------------------------------------------------------------------
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# Process options.
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# ----------------------------------------------------------------------
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type=""
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recurse=
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verbose=
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skip=
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for i
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do
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if [ $skip ]
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then
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skip=
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continue
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fi
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case "$i" in
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-t)
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case "$2" in
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""|-*) echo "$usage" 1>&2 ; exit $EX_USAGE
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esac
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type="$2"
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skip=true
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shift
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;;
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-r)
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recurse="-r"
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;;
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-d)
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exec=echo
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;;
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-v)
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verbose=true
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;;
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-*)
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echo "$cmd: Unknown option $i" 1>&2 ; exit $EX_USAGE
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;;
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*)
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break
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;;
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esac
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shift
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done
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# ----------------------------------------------------------------------
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# Process arguments.
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# ----------------------------------------------------------------------
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name="$1"
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if [ "X$name" = "X" ]
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then
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echo "$usage" 1>&2 ; exit $EX_USAGE
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fi
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# Remove trailing dots.
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name=`echo $name | sed 's/\.*$//'`
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# ----------------------------------------------------------------------
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# Main loop.
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# ----------------------------------------------------------------------
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domain="$name"
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while [ "X$domain" != "X" ]
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do
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# Make sure there is at least one dot.
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parentdomain=`echo $domain | sed 's/^[^.]*\.//'`
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if [ "X$parentdomain" = "X$domain" ]
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then
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domain=""
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continue
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fi
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# Find the servers for this domain.
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servers=`host -t NS "$domain" | awk '$2 == "NS" {print $3}'`
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if [ "X$servers" = "X" ]
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then
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# Move to parent domain and retry.
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domain="$parentdomain"
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continue
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fi
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if [ "X$domain" != "X$name" ]
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then
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echo
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fi
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if [ $verbose ]
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then
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echo "--- $domain ---"
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$exec host -T -t SOA "$domain"
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$exec host -T -t NS "$domain"
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echo
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fi
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for server in $servers
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do
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echo "--- $server ---"
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if [ "X$type" = "X" ]
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then
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$exec host $recurse -T -t MX "$name" "$server"
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$exec host $recurse -T -t A "$name" "$server"
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else
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$exec host $recurse -T -t "$type" "$name" "$server"
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fi
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echo
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done
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exit $EX_OK
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done
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exit $EX_UNAVAILABLE
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