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#!/usr/bin/perl
#
# digparse
#
# Perl code that converts DiG output (version 2.x, 8.x, 9.x) into
# the easily parsable form:
#
# HOST RR RR-ARGS
# i.e.
# fire.domtools.com. A 10.0.0.10
# fire.domtools.com. MX 10 flame.domtools.com.
#
# It understands $ORIGIN and @ and can expand @, blank LHS's, and non-dot-terminated
# LHS and RHSs. No comments or blank lines are printed.
#
# Usage with Dig 2 thru 8: dig @server.dom.ain. AXFR dom.ain. +ret=2 +noauthor +noaddit \
# +noques +noHeader +noheader +cl +noqr +nostats +nocmd | \
# digparse > file
#
# Usage with Dig 9: dig @server.dom.ain. AXFR dom.ain. +ret=2 +noauthority \
# +noadditional +noquestion +nostats +nocmd | digparse > file
#
# There are many differences in output between DiG 2.x, 8.x, and 9.x.
# 2.x doesn't display the class ("IN").
# 8.x abbreviates time fields with letters like "h"=hours, "m"=minutes, "s"=seconds,
# and uses "@" for default origin and sometimes leaves domain off entirely so you
# have to carry forward the current domain name from lines above.
# 9.x output is perfect in every way.
#
# Example inputs that Digparse can parse (using options above) --
#
# Dig 9.x: domtools.com. 86400 IN SOA fire.domtools.com. hostmaster.domtools.com. ( 2000111600 28815 3615 2073600 86400 )
# domtools.com. 86400 IN NS ns0.domtools.com.
#
# Dig 8.x: $ORIGIN domtools.com.
# @ 1D IN SOA fire hostmaster (
# 2000111600 ; serial
# 8h15s ; refresh
# 1h15s ; retry
# 3w3d ; expiry
# 1D ) ; minimum
#
# 1D IN NS ns0
#
# Dig 2.x: domtools.com. 86400 SOA fire.domtools.com. hostmaster.domtools.com. (
# 2000111600 ; serial
# 28815 ; refresh (8 hours 15 secs)
# 3615 ; retry (1 hour 15 secs)
# 2073600 ; expire (24 days)
# 86400 ) ; minimum (1 day)
# domtools.com. 86400 NS ns0.domtools.com.
#
# Output from digparse for all above inputs:
#
# domtools.com. SOA fire.domtools.com. hostmaster.domtools.com. 2000111600 28815 3615 2073600 86400
# domtools.com. NS ns0.domtools.com.
#
# However the seconds are left as-is, so they'll contain h,m,s abbreviations
# when using BIND 8 (but not 2, or 9!) We don't care because Dlint doesn't use them.
#
# Paul Balyoz <pab@domtools.com>
#
# RRs that have a domain name for their rightmost field
# (we tack the default domain onto domains that don't end in ".")
%rhs_is_domain = (
"NS"=>1,
"PTR"=>1,
"MX"=>1,
"CNAME"=>1,
);
# DNS Class Table
%classes = (
"IN"=>1, # Internet
"CH"=>1, # Chaos
);
# Main Loop - input lines from stdin, handle them.
while (<>) {
chop;
next if /^\s*;/; # skip blank & comment lines
next if /^\s*$/;
@f = split;
if ($f[0] eq '$ORIGIN') { # literally the string '$ORIGIN'
$origin = $f[1];
$origin .= "." if $origin !~ /\.$/; # append "." if missing
$origin = "" if $origin eq "."; # use "" for root domain
next;
}
elsif ($f[0] !~ /\.$/) { # record name is missing its ending period!
if ($f[0] eq "@") {
$f[0] = "$origin"; # expand "@" into domain name
} else {
$f[0] .= ".$origin"; # append domain name onto name
}
}
if (/^\s/) { # empty LHS, use curr. domain name
unshift @f, $domain;
}
else {
$domain = $f[0]; # memorize this LHS for future lines
}
splice(@f,2,1) if $classes{uc($f[2])}; # Get rid of Class if exists (DiG 8 & newer)
# By this point the records have been standardized like this --
# $f[0] = LHS (canonical domain name)
# $f[1] = TTL
# $f[2] = RRTYPE
# $f[3]..$f[$#f] = data (1 or more fields)
$rr = uc($f[2]);
if ($rhs_is_domain{$rr} && $f[$#f] !~ /\.$/) { # empty RHS domain name
if ($f[$#f] eq "@") {
$f[$#f] = "$origin"; # "@" is just the origin
} else {
$f[$#f] .= ".$origin"; # otherwise append origin
}
}
# By this point any domain names in the data fields have been canonicalized.
# (we expanded Dig 2.x's "@" symbols and unqualified names to fqdn's)
#
# If we see a RR continuation marker (left-paren)
# then read and parse the rest of the continuation lines.
# The line looked like this:
# @ 4H IN SOA pallas hostmaster.pallas (
#
if (/\(\s*$/) {
undef($f[$#f]); # remove the "(" thing
while (<STDIN>) {
chop;
# Remove comments from the line. DiG 2.1 puts parentheses in the comments!
s/;.*//;
# Next, handle all other data lines in the continuation,
# including the right-paren line. Expect no comments.
# Those lines look like this:
# 712120828 ; serial
# 1H ; refresh
# 5M ; retry
# 1W ; expiry
# 4H ) ; minimum
# if (/\s*([^\);\s]+)\s*\)?\s*;?.*/) {
#} ugh
if (/\s*([^\)\s]+)\s*\)?.*/) {
$f[$#f+1] = $1;
}
last if /\)/; # end continuation line
}
}
if ($rr eq "SOA") {
if ($f[3] !~ /\.$/) { # record name is missing its ending period!
if ($f[3] eq "@") {
$f[3] = "$origin"; # expand "@" into domain name
} else {
$f[3] .= ".$origin"; # append domain name onto name
}
}
if ($f[4] !~ /\.$/) { # record name is missing its ending period!
if ($f[4] eq "@") {
$f[4] = "$origin"; # expand "@" into domain name
} else {
$f[4] .= ".$origin"; # append domain name onto name
}
}
if ($f[5] eq "(") {
splice(@f,5,1); # remove grouping symbols (BIND 9)
}
if ($f[$#f] eq ")") {
splice(@f,$#f,1); # remove grouping symbols (BIND 9)
}
}
# Print resulting data line
$nspaces = 32 - length($f[0]);
$nspaces = 1 if $nspaces < 1;
print $f[0], " " x $nspaces;
#$str = "$f[1] $f[2]";
$str = "$f[2]"; # don't bother printing TTL
$nspaces = 8 - length($str);
$nspaces = 1 if $nspaces < 1;
print "$str", " " x $nspaces;
for ($i=3; $i<=$#f; $i++) {
print " ",$f[$i];
}
print "\n";
}
exit 0;
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