PAL.C.T MINI SHELL
# parser-lib.pl
# Functions for reading and writing the squid config file
use strict;
use warnings;
no warnings 'redefine';
no warnings 'uninitialized';
our (@get_config_cache, %config);
# get_config()
# Parses squid.conf into an array of data structures
sub get_config
{
if (!@get_config_cache) {
my $fh = "CONF";
&open_readfile($fh, $config{'squid_conf'}) || return [];
my $lnum = 0;
while(my $line = <$fh>) {
$line =~ s/\r|\n//g; # strip newlines and comments
if ($line =~ /^\s*(\#?\s*|\#\s+TAG:\s+)(\S+)\s*(.*)$/) {
my %dir;
$dir{'name'} = $2;
$dir{'value'} = $3;
$dir{'enabled'} = !$1;
$dir{'comment'} = $1;
my $str = $3;
while($str =~ /^\s*("[^"]*")(.*)$/ ||
$str =~ /^\s*(\S+)(.*)$/) {
my $v = $1;
$str = $2;
if ($v !~ /^"/ && $v =~ /^(.*)#/ &&
!$dir{'comment'}) {
# A comment .. end of values
$v = $1;
$dir{'postcomment'} = $str;
$str = undef;
last if ($v eq '');
}
$dir{'values'} ||= [ ];
push(@{$dir{'values'}}, $v);
}
$dir{'line'} = $lnum;
$dir{'index'} = scalar(@get_config_cache);
if ($dir{'comment'} =~ /TAG/) {
$dir{'tag'} = 1;
}
push(@get_config_cache, \%dir);
}
$lnum++;
}
close($fh);
}
return \@get_config_cache;
}
# find_config(name, &config, [disabled-mode])
# Returns the structure(s) with some name
# disabled mode 0 = only enabled, 1 = both, 2 = only disabled,
# 3 = disabled and tags
sub find_config
{
my ($name, $conf, $mode) = @_;
$mode ||= 0;
my @rv;
foreach my $c (@$conf) {
if ($c->{'name'} eq $name) {
push(@rv, $c);
}
}
if ($mode == 0) {
@rv = grep { $_->{'enabled'} && !$_->{'tag'} } @rv;
}
elsif ($mode == 1) {
@rv = grep { !$_->{'tag'} } @rv;
}
elsif ($mode == 2) {
@rv = grep { !$_->{'enabled'} && !$_->{'tag'} } @rv;
}
elsif ($mode == 3) {
@rv = grep { !$_->{'enabled'} } @rv;
}
return @rv ? wantarray ? @rv : $rv[0]
: wantarray ? () : undef;
}
# find_value(name, &config, [disabled-mode])
# Returns the value of some directive
sub find_value
{
my ($name, $conf, $mode) = @_;
my $rv = &find_config($name, $conf, $mode);
return $rv ? $rv->{'value'} : undef;
}
# find_values(name, &config, [disabled-mode])
# Returns the value of some directive
sub find_values
{
my ($name, $conf, $mode) = @_;
my $rv = &find_config($name, $conf, $mode);
return $rv ? $rv->{'values'} : undef;
}
# save_value(&config, name, value*)
sub save_value
{
my ($conf, $name, @values) = @_;
my @v = map { { 'name' => $name,
'values' => [ $_ ] } } @values;
&save_directive($conf, $name, \@v);
}
# save_directive(&config, name, &values, [after], [before])
# Given a structure containing a directive name, type, values and members
# add, update or remove that directive in config structure and data files.
sub save_directive
{
my ($conf, $name, $values, $after, $before) = @_;
my @oldv = &find_config($name, $conf);
my @newv = map { my %n = %$_; \%n } @$values;
my $lref = &read_file_lines($config{'squid_conf'});
my $change = undef;
for(my $i=0; $i<@oldv || $i<@newv; $i++) {
if ($i >= @oldv) {
# a new directive is being added..
my $nl = &directive_line($newv[$i]);
my @afterdirs = ref($after) ? ( $after ) :
$after ? &find_config($after, $conf) : ( );
my $afterdir = @afterdirs ? $afterdirs[$#afterdirs] : undef;
my @beforedirs = ref($before) ? ( $before ) :
$before ? &find_config($before, $conf) : ( );
my $beforedir = @beforedirs ? $beforedirs[0] : undef;
my @comment = &find_config($_[1], $_[0], 3);
my $comment = @comment ? $comment[$#comment] : undef;
if ($beforedir) {
# put it before the specified type of directive
my $blnum = $beforedir->{'line'};
&renumber($conf, $beforedir->{'line'}-1, 1);
$newv[$i]->{'line'} = $blnum;
splice(@$lref, $newv[$i]->{'line'}, 0, $nl);
splice(@$conf, &indexof($beforedir, @$conf),
0, $newv[$i]);
}
elsif ($change &&
(!$afterdir || $afterdir->{'line'} < $change->{'line'})) {
# put it after any directives of the same type
$newv[$i]->{'line'} = $change->{'line'}+1;
splice(@$lref, $newv[$i]->{'line'}, 0, $nl);
&renumber($conf, $change->{'line'}, 1);
splice(@$conf, &indexof($change, @$conf),
0, $newv[$i]);
$change = $newv[$i];
}
elsif ($comment) {
# put it after commented line
$newv[$i]->{'line'} = $comment->{'line'}+1;
splice(@$lref, $newv[$i]->{'line'}, 0, $nl);
&renumber($conf, $comment->{'line'}, 1);
splice(@$conf, &indexof($comment, @$conf),
0, $newv[$i]);
}
else {
# put it at the end of the file
$newv[$i]->{'line'} = scalar(@$lref);
push(@$lref, $nl);
push(@$conf, $newv[$i]);
}
}
elsif ($i >= @newv) {
# a directive was deleted
splice(@$lref, $oldv[$i]->{'line'}, 1);
&renumber($conf, $oldv[$i]->{'line'}, -1);
splice(@$conf, &indexof($oldv[$i], @$conf), 1);
}
else {
# updating some directive
$newv[$i]->{'postcomment'} = $oldv[$i]->{'postcomment'};
my $nl = &directive_line($newv[$i]);
my @after = $change && $after ? ( $change ) :
# After last one updated
ref($after) ? ( $after ) : # After specific
$after ? &find_config($after, $conf) : ( );
my $after = @after ? $after[$#after] : undef;
if ($after && $oldv[$i]->{'line'} < $after->{'line'}) {
# Need to move it after some directive
splice(@$lref, $oldv[$i]->{'line'}, 1);
splice(@$conf, &indexof($oldv[$i], @$conf), 1);
&renumber($conf, $oldv[$i]->{'line'}, -1);
splice(@$lref, $after->{'line'}+1, 0, $nl);
$newv[$i]->{'line'} = $after->{'line'}+1;
splice(@$conf, &indexof($after, @$conf)+1, 0,
$newv[$i]);
&renumber($conf, $newv[$i]->{'line'}, 1);
$change = $newv[$i];
}
else {
# Can just update at the same line
splice(@$lref, $oldv[$i]->{'line'}, 1, $nl);
$newv[$i]->{'line'} = $oldv[$i]->{'line'};
$conf->[&indexof($oldv[$i], @$conf)] = $newv[$i];
$change = $newv[$i];
}
}
}
}
# directive_line(&details)
# Returns the line of text for some directive
sub directive_line
{
my ($d) = @_;
my @v = @{$d->{'values'}};
return $d->{'name'}.(@v ? " ".join(' ',@v) : "").
($d->{'postcomment'} ? " #".$d->{'postcomment'} : "");
}
# renumber(&directives, line, count, [end])
# Runs through the given array of directives and increases the line numbers
# of all those greater than some line by the given count
sub renumber
{
my ($conf, $line, $count, $end) = @_;
foreach my $d (@$conf) {
if ($d->{'line'} > $line && (!$end || $d->{'line'} < $end)) {
$d->{'line'} += $count;
}
}
}
1;
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