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|
#!/usr/bin/perl
# Author: An-Cheng Huang <ancheng@vyatta.com>
# Date: 2007
# Description: Type checking script
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2006, 2007, 2008 Vyatta, Inc.
# All Rights Reserved.
# **** End License ****
# Perl module for type validation.
# Usage 1: validate a value of a specific type.
# use Vyatta::TypeChecker;
# ...
# if (validateType('ipv4', '1.1.1.1')) {
# # valid
# ...
# } else {
# # not valie
# ...
# }
#
# Usage 2: find the type of a value (from a list of candidates), returns
# undef if the value is not valid for any of the candidates.
# $valtype = findType('1.1.1.1', 'ipv4', 'ipv6');
# if (!defined($valtype)) {
# # neither ipv4 nor ipv6
# ...
# } else {
# if ($valtype eq 'ipv4') {
# ...
# } else {
# ...
# }
# }
package Vyatta::TypeChecker;
our @EXPORT = qw(findType validateType);
use base qw(Exporter);
use strict;
my %type_handler = (
'ipv4' => \&validate_ipv4,
'ipv4net' => \&validate_ipv4net,
'ipv4range' => \&validate_ipv4range,
'ipv4_negate' => \&validate_ipv4_negate,
'ipv4net_negate' => \&validate_ipv4net_negate,
'ipv4range_negate' => \&validate_ipv4range_negate,
'iptables4_addr' => \&validate_iptables4_addr,
'protocol' => \&validate_protocol,
'protocol_negate' => \&validate_protocol_negate,
'macaddr' => \&validate_macaddr,
'macaddr_negate' => \&validate_macaddr_negate,
'ipv6' => \&validate_ipv6,
);
sub validate_ipv4 {
$_ = shift;
return 0 if (!/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/);
return 0 if ($1 > 255 || $2 > 255 || $3 > 255 || $4 > 255);
return 1;
}
sub validate_ipv4net {
$_ = shift;
return 0 if (!/^(\d+)\.(\d+)\.(\d+)\.(\d+)\/(\d+)$/);
return 0 if ($1 > 255 || $2 > 255 || $3 > 255 || $4 > 255 || $5 > 32);
return 1;
}
sub validate_ipv4range {
$_ = shift;
return 0 if (!/^([^-]+)-([^-]+)$/);
my ($a1, $a2) = ($1, $2);
return 0 if (!validate_ipv4($a1) || !validate_ipv4($a2));
return 1;
}
sub validate_ipv4_negate {
my $value = shift;
if ($value =~ m/^\!(.*)$/) {
$value = $1;
}
return validate_ipv4($value);
}
sub validate_ipv4net_negate {
my $value = shift;
if ($value =~ m/^\!(.*)$/) {
$value = $1;
}
return validate_ipv4net($value);
}
sub validate_ipv4range_negate {
my $value = shift;
if ($value =~ m/^\!(.*)$/) {
$value = $1;
}
return validate_ipv4range($value);
}
sub validate_iptables4_addr {
my $value = shift;
return 0 if (!validate_ipv4_negate($value)
&& !validate_ipv4net_negate($value)
&& !validate_ipv4range_negate($value));
return 1;
}
sub validate_protocol {
my $value = shift;
$value = lc $value;
return 1 if ($value eq 'all');
if (!open(IN, "</etc/protocols")) {
print "can't open /etc/protocols";
return 0;
}
my $ret = 0;
while (<IN>) {
s/^([^#]*)#.*$/$1/;
if ((/^$value\s/) || (/^\S+\s+$value\s/)) {
$ret = 1;
last;
}
}
close IN;
return $ret;
}
sub validate_protocol_negate {
my $value = shift;
if ($value =~ m/^\!(.*)$/) {
$value = $1;
}
return validate_protocol($value);
}
sub validate_macaddr {
my $value = shift;
$value = lc $value;
my $byte = '[0-9a-f]{2}';
return 1 if ($value =~ /^$byte(:$byte){5}$/);
}
sub validate_macaddr_negate {
my $value = shift;
if ($value =~ m/^\!(.*)$/) {
$value = $1;
}
return validate_macaddr($value);
}
# IPv6 syntax definition
my $RE_IPV4_BYTE = '((25[0-5])|(2[0-4][0-9])|([01][0-9][0-9])|([0-9]{1,2}))';
my $RE_IPV4 = "$RE_IPV4_BYTE(\.$RE_IPV4_BYTE){3}";
my $RE_H16 = '([a-fA-F0-9]{1,4})';
my $RE_H16_COLON = "($RE_H16:)";
my $RE_LS32 = "(($RE_H16:$RE_H16)|($RE_IPV4))";
my $RE_IPV6_P1 = "($RE_H16_COLON)\{6\}$RE_LS32";
my $RE_IPV6_P2 = "::($RE_H16_COLON)\{5\}$RE_LS32";
my $RE_IPV6_P3 = "($RE_H16)?::($RE_H16_COLON)\{4\}$RE_LS32";
my $RE_IPV6_P4 = "(($RE_H16_COLON)\{0,1\}$RE_H16)?"
. "::($RE_H16_COLON)\{3\}$RE_LS32";
my $RE_IPV6_P5 = "(($RE_H16_COLON)\{0,2\}$RE_H16)?"
. "::($RE_H16_COLON)\{2\}$RE_LS32";
my $RE_IPV6_P6 = "(($RE_H16_COLON)\{0,3\}$RE_H16)?"
. "::($RE_H16_COLON)\{1\}$RE_LS32";
my $RE_IPV6_P7 = "(($RE_H16_COLON)\{0,4\}$RE_H16)?::$RE_LS32";
my $RE_IPV6_P8 = "(($RE_H16_COLON)\{0,5\}$RE_H16)?::$RE_H16";
my $RE_IPV6_P9 = "(($RE_H16_COLON)\{0,6\}$RE_H16)?::";
my $RE_IPV6 = "($RE_IPV6_P1)|($RE_IPV6_P2)|($RE_IPV6_P3)|($RE_IPV6_P4)"
. "|($RE_IPV6_P5)|($RE_IPV6_P6)|($RE_IPV6_P7)|($RE_IPV6_P8)"
. "|($RE_IPV6_P9)";
sub validate_ipv6 {
$_ = shift;
return 0 if (!/^$RE_IPV6$/);
return 1;
}
sub validateType {
my ($type, $value, $quiet) = @_;
if (!defined($type) || !defined($value)) {
return 0;
}
if (!defined($type_handler{$type})) {
print "type \"$type\" not defined\n" if (!defined($quiet));
return 0;
}
if (!&{$type_handler{$type}}($value)) {
print "\"$value\" is not a valid value of type \"$type\"\n"
if (!defined($quiet));
return 0;
}
return 1;
}
sub findType {
my ($value, @candidates) = @_;
if (!defined($value) || ((scalar @candidates) < 1)) {
return undef;
}
foreach my $type (@candidates) {
if (!defined($type_handler{$type})) {
next;
}
if (&{$type_handler{$type}}($value)) {
# the first valid type is returned
return $type;
}
}
return undef;
}
1;
|
