Update to mt dns checker

[Dazed_75]

The output:
larry at lapdog2:~$ ./dnscheck.sh
Usage: dnscheck [target_domain] | [dnsprovider dns_ip [additional_ips ...]]

    Sun Jun 19 01:07:42 MST 2011
Resolving yahoo.com @ 8.8.8.8    Google (avg msecs)= 88.900
 95 84 88 87 89 92 95 86 87 86
Resolving yahoo.com @ 8.8.4.4    Google (avg msecs)= 69.700
 68 68 69 69 68 69 71 75 70 70
Resolving yahoo.com @ 208.67.222.222    Opendns (avg msecs)= 40.800
 44 39 40 40 39 49 40 39 40 38
Resolving yahoo.com @ 208.67.220.220    Opendns (avg msecs)= 39.800
 43 39 40 39 39 41 42 39 38 38
Resolving yahoo.com @ 205.171.3.65    Qwest (avg msecs)= 61.200
 59 62 62 59 60 60 63 67 60 60
Resolving yahoo.com @ 205.171.2.65    Qwest (avg msecs)= 67.700
 60 85 104 73 60 59 59 59 58 60
Resolving yahoo.com @ 97.64.183.164    Mediacom (avg msecs)= 77.600
 76 76 76 76 75 75 80 79 82 81
Resolving yahoo.com @ 97.64.179.250    Mediacom (avg msecs)= 81.800
 79 89 86 83 83 79 79 80 79 81
Resolving yahoo.com @ 68.105.28.11    Cox (avg msecs)= 101.000
 101 100 100 101 100 100 102 101 103 102
Resolving yahoo.com @ 68.105.29.12    Cox (avg msecs)= 95.400
 97 96 96 93 94 93 96 102 94 93

The script (it could certainly be improved):
larry at lapdog2:~$ cat dnscheck.sh
#!/bin/bash
#
## Adapted from
http://www.webupd8.org/2010/09/determine-dns-query-duration-quick.html
## by Larry Thiel 09/26/2010 No Rights Reserved
## modified by LT 10/04/2010
## modified by LT 06/18/2011 to rearrange display lines (could make 2nd line
optional)

function checkdns ()
{
    local prov=$1
    local serv=$2
    local targ=$3
        #whois ${serv} | grep NetName    # not used but don't forget idea
x=0; queries=10
declare -a mtime

echo -n "Resolving ${targ} @ ${serv}"

for i in `seq $queries`
do
  result=$( dig @${serv} $targ | grep "Query time" | cut -f 4 -d " " )
  if [ ! $result ]
    then result="9999"
  fi
  let mtime[i]=$result
  let x+=$result
  if [ $result == 9999 ]
    then echo -n "-->Apparently ${serv} is not reachable"; logger -t
dnscheck "Apparently ${serv} is not reachable";break
  fi
done && echo -n "    $prov (avg msecs)= " && echo "scale=3;($x/${i}) " | bc

x=0
echo -n " "
for i in `seq $queries`
do
  let x+=mtime[i]
  echo -n "${mtime[i]} "
done && echo
}

## Main body begins.  Until arg processing improved, always display usage
info
##
echo "Usage: dnscheck [target_domain] | [dnsprovider dns_ip [additional_ips
...]]"
echo

## If the user provides a single argument, assume it is a target to lookup
## otherwise assume it is a provider name followed by the IPs of their DNS
servers
provider=localhost; server=127.0.0.1; target=yahoo.com
#echo "---- debug: argument count=" $#
echo -n "    " && date
if [ $# == 1 ]
  then
      target=$1;
elif [ $# > 1 ]
  then
    provider=$1; shift
    while [ $1 ]
    do
      server=$1
      checkdns ${provider} ${server} ${target}
      shift
    done
fi

## In all cases check known servers for comparison purposes
## Note: it would be good to make this optional or only for specific
provider(s)
checkdns Google 8.8.8.8 ${target}
checkdns Google 8.8.4.4 ${target}
checkdns Opendns 208.67.222.222 ${target}
checkdns Opendns 208.67.220.220 ${target}
checkdns Qwest 205.171.3.65 ${target}
checkdns Qwest 205.171.2.65 ${target}
checkdns Mediacom 97.64.183.164 ${target}
checkdns Mediacom 97.64.179.250 ${target}
checkdns Cox 68.105.28.11 ${target}
checkdns Cox 68.105.29.12 ${target}

larry at lapdog2:~$

-- 
Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain occasions,
that I wish it always to be kept alive.
  - Thomas Jefferson
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