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#!/bin/sh
eval 'exec perl -x $0 ${1+"$@"}'
if 0;
# This hack makes a shell script which calls Perl also a Perl script.
# We do it this way so this script will run on a system where the user
# has Perl, even if Perl is in /usr/local/bin instead of /usr/bin
#!/usr/bin/perl
# This is a tool for converting CSV1 zone files in to a CSV2 compatible format
# Cleanup: Subroutine that removes potentially dangerous stuff from a hostname
sub cleanup {
my($in) = @_;
# Security: Get rid of all ASCII except [0-9A-Za-z\.\@\%\_\-]
$in =~ s/[^0-9A-Za-z\.\@\%\x80-\xff\-\_]//g;
# Get rid of all % except trailing %
if($in =~ /\%$/) {
$in =~ s/\%//g;
$in = $in . "%";
} else { $in =~ s/\%//g; }
return nonmt($in);
}
# non-empty: Subroutine that makes sure a string is not empty
sub nonmt {
my($in) = @_;
return nonmt_r($in,"0");
}
sub nonmt_q {
my($in) = @_;
return nonmt_r($in,"\'\'");
}
sub nonmt_r {
my($in,$replace) = @_;
if($in =~ /^[\s\|]*$/) {
$in = $replace;
}
return $in;
}
while(<>) {
if(/^#/) {print;next;} # Comments are printed as-is
if(/^\s*$/) {print;next;} # Ditto with lines with just whitespace
if(/^(.)(.*)/) {$rrtype = $1; $rest=$2;
($hostname,$ttl,$rdata) = split(/\|/,$rest,3);
# Do security cleanup on hostname
$hostname = cleanup($hostname);
# Security: Get rid of anything that isn't a number in ttl
$ttl =~ s/[^0-9]//g;
$ttl = nonmt($ttl);
if($rrtype =~ /^A/) {
# Remove non numeric and dot from rdata
$rdata =~ s/[^0-9\.]//g;
$rdata = nonmt($rdata);
print "$hostname|+$ttl|A|$rdata\n";
} elsif($rrtype =~ /^N/) {
$rdata = cleanup($rdata);
print "$hostname|+$ttl|NS|$rdata\n";
} elsif($rrtype =~ /^P/) {
$rdata = cleanup($rdata);
print "$hostname|+$ttl|PTR|$rdata\n";
} elsif($rrtype =~ /^C/) {
$rdata = cleanup($rdata);
print "$hostname|+$ttl|CNAME|$rdata\n";
} elsif($rrtype =~ /^@/) {
# MX records
($priority,$h) = split(/\|/,$rdata,2);
$priority =~ s/[^0-9]//g;
$h = cleanup($h);
$priority = nonmt($priority);
print "$hostname|+$ttl|MX|$priority|$h\n";
} elsif($rrtype =~ /^S/) {
# SOA records
($o,$e,$s,$rf,$rt,$ex,$min) = split(/\|/,$rdata,7);
$o = cleanup($o);
$e = cleanup($e);
$s =~ s/[^0-9]//g;
$s = nonmt($s);
$rf =~ s/[^0-9]//g;
$rf = nonmt($rf);
$rt =~ s/[^0-9]//g;
$rt = nonmt($rt);
$ex =~ s/[^0-9]//g;
$ex = nonmt($ex);
$min =~ s/[^0-9]//g;
$min = nonmt($min);
print "$hostname|+$ttl|SOA|$o|$e|$s|$rf|$rt|$ex|$min\n";
}
# It's a little tricky converting TXT and RAW records; this
# hopefully covers all real-world examples.
elsif($rrtype =~ /^T/ || $rrtype =~ /^U/) {
if($rrtype =~ /^U/) {
($rrnum,$rdata) = split(/\|/,$rdata,2);
}
# Security: Get rid of backslashes that would cause
# a syntax error when parsed with the csv1 parser
$rdata =~ s/\\([^\\\%0-3])/$1/g;
$rdata =~ s/\'/\'\\\'\'/g; # make ' -> '\'' (ugh)
$rdata =~ s/\\\%/%/g; # make \% just %
$rdata =~ s/\\\\/\\/g; # make \\ just \
# The following line puts octal numbers outside of
# quotes, since they can not be quoted.
$rdata =~ s/(\\[0-3][0-7][0-7])/\'$1\'/g;
# get rid of ugly (but yes parsable) '' sequences
# '\001''\002''\003' -> '\001\002\003'
$rdata =~
s/(\\[0-3][0-7][0-7])\'\'(\\[0-3][0-7][0-7])/$1$2/g;
# '\'''\'''\'' -> '\'\'\'' by making ''\' simply \'
$rdata =~ s/\'\'\\\'/\\\'/g;
# Put quotes around the string
$rdata = "\'" . $rdata . "\'";
# The next two lines get rid of ugly '' at the
# beginning and end of the string
$rdata =~ s/^\'\'//;
$rdata =~ s/\'\'$//;
# Make sure the final string is not empty
$rdata = nonmt_q($rdata);
if($rrtype =~ /^T/) {
print "$hostname|+$ttl|TXT|$rdata\n";
} else {
print "$hostname|+$ttl|RAW|$rrnum|$rdata\n";
}
}
}
}
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