/usr/share/perl5/IM/Alias.pm is in im 1:152-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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################################################################
###
### Alias.pm
###
### Author: Internet Message Group <img@mew.org>
### Created: Apr 23, 1997
### Revised: Apr 23, 2007
###
my $PM_VERSION = "IM::Alias.pm version 20151220(IM152)";
package IM::Alias;
require 5.003;
require Exporter;
use IM::Config qw(expand_path aliases_file addrbook_file);
use IM::Util;
use integer;
use strict;
use vars qw(@ISA @EXPORT);
@ISA = qw(Exporter);
@EXPORT = qw(alias_read alias_lookup alias_print
hosts_read hosts_completion hosts_lookup hosts_print);
use vars qw(%MAIL_ALIAS_HASH %MAIL_ALIASES %HOST_ALIASES);
##### READ MAIL ALIAS FILES #####
#
# alias_read($mail_aliases_files, $addrbook_files)
#
# return value: none
#
sub alias_read(;$$) {
my @olds = split(',', shift || aliases_file());
my @news = split(',', shift || addrbook_file());
my $usenew = 0;
my @aliases;
my $ali;
foreach $ali (@news) {
$ali = expand_path($ali);
if (-r $ali) {
$usenew = 1;
last;
}
}
if ($usenew == 1) {
@aliases = @news;
} else {
@aliases = @olds;
}
%MAIL_ALIASES = ();
%MAIL_ALIAS_HASH = ();
ALI: foreach $ali (@aliases) {
$ali = expand_path($ali);
if ($MAIL_ALIAS_HASH{$ali}) {
im_notice("already opened mail-aliases file: $ali\n");
next;
}
unless (open(ALIAS, "<$ali")) {
im_notice("can't open mail-aliases file: $ali, ignored.\n");
next;
}
im_debug("mail alias file $ali opened\n") if &debug('alias');
$MAIL_ALIAS_HASH{$ali} = 1;
my $line;
while (defined($line = <ALIAS>)) {
next if ($line =~ /^[\#;]/);
# xxx Mew allows # in the middle of line.
# because of non-ASCII, IM can't support it
next if ($line =~ /^\s*$/);
chomp($line);
if ($line =~ /^<\s*(\S+)$/) {
push(@aliases, $1);
next;
}
$line =~ s/^\s+//;
if ($line =~ /^\S+[:=]/) {
my $cont;
while ($line =~ /\\$/) {
chop($line);
unless (defined($cont = <ALIAS>)) {
im_warn("EOF encountered on the entry: $line.\n");
next ALI;
}
chomp($cont);
$cont =~ s/^\s*/ /;
$line .= $cont;
}
my($name, $val) = split('\s*[:=]\s*', $line, 2);
$MAIL_ALIASES{$name} = $val if $val;
} else {
#personal info. Skip continuous lines.
while ($line =~ /\\$/) {
$line = <ALIAS>;
unless (defined($line)) {
next ALI;
}
}
}
}
close(ALIAS);
}
}
##### USER LEVEL ALIAS LOOKUP #####
#
# alias_lookup(alias)
# alias: an alias to be looked up
# return value: aliased address OR null
#
sub alias_lookup($) {
my $alias = shift;
return '' if ($alias =~ /[\@%!:]/o);
im_debug ("looking up alias for $alias\n") if &debug ('alias') ;
my $addr = $MAIL_ALIASES{$alias};
if ($addr) {
im_debug("found $alias -> $addr\n") if &debug('alias');
return $addr;
}
return '';
}
##### PRINT ALL MAIL ALIAES #####
#
# alias_print(alias)
# alias: an alias to be looked up
# return value: none
#
sub alias_print(;$) {
my $alias = shift;
if ($alias) {
im_debug("searching $alias.\n") if (&debug('alias'));
if ($MAIL_ALIASES{$alias}) {
print "$alias: $MAIL_ALIASES{$alias}\n";
}
} else {
my $key;
foreach $key (sort keys %MAIL_ALIASES) {
print "$key: $MAIL_ALIASES{$key}\n";
}
}
}
##### READ HOST ALIAS FILES #####
#
# hosts_read($host_aliases)
#
# return value: none
#
sub hosts_read(;$) {
my @aliases = split(',', shift || '~/.hostaliases');
my $ali;
%HOST_ALIASES = ();
foreach $ali (@aliases) {
$ali = expand_path($ali);
unless (open(ALIAS, "<$ali")) {
im_notice("can't open host-aliases file: $ali, ignored.\n");
next;
}
im_debug("host alias file $ali opened\n") if &debug('alias');
my $line;
while (defined($line = <ALIAS>)) {
$line =~ s/#.*//;
if ($line =~ /([\w.-]+)\s+([\w.-]+)/) {
$HOST_ALIASES{$1} = $2;
}
}
close(ALIAS);
}
}
##### USER LEVEL ADDRESS COMPLETION #####
#
# hosts_completion(address)
# address: an address to be tried completion
# cmpl: flag whether complete with get_host_byname() or not;
# return value: completed address OR null
#
sub hosts_completion($;$) {
my($addr, $cmpl) = @_;
if ($addr =~ /^([\w.-]+)@([\w.-]+)$/) {
my($local, $domain) = ($1, $2);
im_debug("searching $domain by host alias file.\n") if &debug('alias');
my $new = $HOST_ALIASES{$domain};
if ($new) {
im_debug("found(file): $domain -> $new\n") if (&debug('alias'));
return "$local\@$new";
}
if ($cmpl) {
im_debug("searching $domain with gethostbyname().\n")
if (&debug('alias'));
my($he_name) = gethostbyname($domain);
if (length($he_name) > length($domain)) {
im_debug("found(gethostbyname): $domain -> $he_name\n")
if (&debug('alias'));
return "$local\@$he_name";
}
}
}
return '';
}
##### USER LEVEL HOSTS LOOKUP #####
#
# hosts_lookup(alias)
# alias: an alias to be looked up
# return value: aliased hosts OR null
#
sub hosts_lookup($) {
my $alias = shift;
my $host = $HOST_ALIASES{$alias};
if ($host) {
im_debug("found $alias -> $host\n") if &debug('alias');
return $host;
}
return '';
}
##### PRINT ALL HOSTS ALIAES #####
#
# hosts_print(alias)
# alias: an alias to be looked up
# return value: none
#
sub hosts_print(;$) {
my $alias = shift;
if ($alias) {
im_debug("searching $alias.\n") if (&debug('alias'));
if ($HOST_ALIASES{$alias}) {
print "$alias\t$HOST_ALIASES{$alias}\n";
}
} else {
my $key;
foreach $key (sort keys %HOST_ALIASES) {
print "$key\t$HOST_ALIASES{$key}\n";
}
}
}
1;
__END__
=head1 NAME
IM::Alias - mail and host alias looking up package
=head1 SYNOPSIS
use IM::Alias;
alias_read(mail_alias_files, addrbook_files);
$result = alias_lookup(user_name);
alias_print(alias);
hosts_read(hosts_alias_files);
$result = hosts_completion(mail_address);
hosts_print(alias);
=head1 DESCRIPTION
The I<IM::Alias> module handles mail and host aliases.
This modules is provided by IM (Internet Message).
=head1 EXAMPLES
alias_read("$HOME/.im/Aliases", "$HOME/.im/Addrbook");
hosts_read("$HOME/.hostaliases");
$result = alias_lookup('u');
print "$result\n" if ($result);
$result = hosts_completion('u@h');
print "$result\n" if ($result);
alias_print("a") displays mail addresses whose alias is "a".
hosts_print("") displays all host aliases.
=head1 COPYRIGHT
IM (Internet Message) is copyrighted by IM developing team.
You can redistribute it and/or modify it under the modified BSD
license. See the copyright file for more details.
=cut
### Copyright (C) 1997, 1998, 1999 IM developing team
### All rights reserved.
###
### Redistribution and use in source and binary forms, with or without
### modification, are permitted provided that the following conditions
### are met:
###
### 1. Redistributions of source code must retain the above copyright
### notice, this list of conditions and the following disclaimer.
### 2. Redistributions in binary form must reproduce the above copyright
### notice, this list of conditions and the following disclaimer in the
### documentation and/or other materials provided with the distribution.
### 3. Neither the name of the team nor the names of its contributors
### may be used to endorse or promote products derived from this software
### without specific prior written permission.
###
### THIS SOFTWARE IS PROVIDED BY THE TEAM AND CONTRIBUTORS ``AS IS'' AND
### ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
### IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
### PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE TEAM OR CONTRIBUTORS BE
### LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
### CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
### SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
### BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
### WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
### OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
### IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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