184 lines
4.5 KiB
Perl
184 lines
4.5 KiB
Perl
package Net::DNS::Resolver::os390;
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use strict;
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use warnings;
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our $VERSION = (qw$Id: os390.pm 1856 2021-12-02 14:36:25Z willem $)[2];
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=head1 NAME
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Net::DNS::Resolver::os390 - IBM OS/390 resolver class
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=cut
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use base qw(Net::DNS::Resolver::Base);
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use IO::File;
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local $ENV{PATH} = join ':', grep {$_} qw(/bin /usr/bin), $ENV{PATH};
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my $sysname = eval {`sysvar SYSNAME 2>/dev/null`} || '';
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chomp $sysname;
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my %RESOLVER_SETUP; ## placeholders for unimplemented search list elements
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my @dataset = ( ## plausible places to seek resolver configuration
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$RESOLVER_SETUP{GLOBALTCPIPDATA},
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$ENV{RESOLVER_CONFIG}, # MVS dataset or Unix file name
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"/etc/resolv.conf",
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$RESOLVER_SETUP{SYSTCPD},
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"//TCPIP.DATA", # <username>.TCPIP.DATA
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"//'${sysname}.TCPPARMS(TCPDATA)'",
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"//'SYS1.TCPPARMS(TCPDATA)'",
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$RESOLVER_SETUP{DEFAULTTCPIPDATA},
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"//'TCPIP.TCPIP.DATA'"
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);
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my $dotfile = '.resolv.conf';
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my @dotpath = grep {$_} $ENV{HOME}, '.';
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my @dotfile = grep { -f $_ && -o _ } map {"$_/$dotfile"} @dotpath;
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my %option = ( ## map MVS config option names
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NSPORTADDR => 'port',
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RESOLVERTIMEOUT => 'retrans',
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RESOLVERUDPRETRIES => 'retry',
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SORTLIST => 'sortlist',
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);
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sub _init {
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my $defaults = shift->_defaults;
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my %stop;
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local $ENV{PATH} = join ':', grep {$_} qw(/bin /usr/bin), $ENV{PATH};
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foreach my $dataset ( Net::DNS::Resolver::Base::_untaint( grep {$_} @dataset ) ) {
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eval {
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local $_;
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my @nameserver;
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my @searchlist;
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my $handle = IO::File->new( qq[cat "$dataset" 2>/dev/null], '-|' )
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or die "$dataset: $!"; # "cat" able to read MVS datasets
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while (<$handle>) {
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s/[;#].*$//; # strip comment
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s/^\s+//; # strip leading white space
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next unless $_; # skip empty line
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next if m/^\w+:/ && !m/^$sysname:/oi;
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s/^\w+:\s*//; # discard qualifier
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m/^(NSINTERADDR|nameserver)/i && do {
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my ( $keyword, @ip ) = grep {defined} split;
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push @nameserver, @ip;
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next;
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};
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m/^(DOMAINORIGIN|domain)/i && do {
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my ( $keyword, @domain ) = grep {defined} split;
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$defaults->domain(@domain) unless $stop{domain}++;
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next;
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};
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m/^search/i && do {
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my ( $keyword, @domain ) = grep {defined} split;
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push @searchlist, @domain;
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next;
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};
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m/^option/i && do {
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my ( $keyword, @option ) = grep {defined} split;
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foreach (@option) {
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my ( $attribute, @value ) = split m/:/;
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$defaults->_option( $attribute, @value )
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unless $stop{$attribute}++;
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}
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next;
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};
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m/^RESOLVEVIA/i && do {
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my ( $keyword, $value ) = grep {defined} split;
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$defaults->_option( 'usevc', $value eq 'TCP' )
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unless $stop{usevc}++;
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next;
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};
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m/^\w+\s*/ && do {
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my ( $keyword, @value ) = grep {defined} split;
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my $attribute = $option{uc $keyword} || next;
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$defaults->_option( $attribute, @value )
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unless $stop{$attribute}++;
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};
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}
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close($handle);
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$defaults->nameserver(@nameserver) if @nameserver && !$stop{nameserver}++;
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$defaults->searchlist(@searchlist) if @searchlist && !$stop{search}++;
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};
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warn $@ if $@;
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}
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%$defaults = Net::DNS::Resolver::Base::_untaint(%$defaults);
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$defaults->_read_config_file($_) foreach @dotfile;
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$defaults->_read_env;
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return;
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}
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1;
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__END__
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=head1 SYNOPSIS
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use Net::DNS::Resolver;
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=head1 DESCRIPTION
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This class implements the OS specific portions of C<Net::DNS::Resolver>.
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No user serviceable parts inside, see L<Net::DNS::Resolver>
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for all your resolving needs.
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=head1 COPYRIGHT
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Copyright (c)2017 Dick Franks.
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All rights reserved.
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=head1 LICENSE
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted, provided
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that the original copyright notices appear in all copies and that both
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copyright notice and this permission notice appear in supporting
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documentation, and that the name of the author not be used in advertising
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or publicity pertaining to distribution of the software without specific
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prior written permission.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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=head1 SEE ALSO
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L<perl>, L<Net::DNS>, L<Net::DNS::Resolver>
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=cut
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