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include/dual_rootfs/usr/sbin/pam_getenv

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+#!/usr/bin/perl -w
+
+=head1 NAME
+
+pam_getenv - get environment variables from /etc/environment
+
+=head1 SYNOPSIS
+
+pam_getenv B<[-l] [-s]> I<env_var>
+
+=head1 DESCRIPTION
+
+This tool  will print out the value of I<env_var> from F</etc/environment>.  It will attempt to expand environment variable references in the definition of I<env_var> but will fail if PAM items are expanded.
+
+The B<-l> option indicates the script should return an environment variable related to default locale information.
+
+The B<-s> option indicates that the script should return an
+system default environment variable.
+
+Currently neither the B<-l> or B<-s> options do anything.  They are
+included because future versions of Debian may have a separate
+repository for the initial environment used by init scripts and for
+system locale information.  These options will allow this script to be
+a stable interface even in that environment.
+
+=cut
+
+# Copyright 2004 by Sam Hartman
+# This script may be copied under the terms of the GNU GPL
+# version 2, or at your option any later version.
+
+use strict;
+use vars qw(*CONFIGFILE *ENVFILE);
+
+sub read_line($) {
+  my $fh = shift;
+  my $line;
+  local $_;
+  line: while (<$fh>) {
+    chomp;
+    s/^\s+//;
+s/\#.*$//;
+    next if $_ eq "";
+    if (s/\\\s*$//) {
+      $line .= $_;
+      next line;
+    }
+
+    $line .= $_;
+    last;
+  }
+  $line;
+  
+}
+
+
+sub parse_line($) {
+  my $var;
+  my (%x, @x);
+  local $_ = shift;
+  return undef unless defined $_ and s/(\S+)\s//;
+  $var->{Name} = $1;
+  s/^\s*//;
+  @x = split(/=([^"\s]\S*|"[^"]*")\s*/, $_);
+  unless (scalar(@x)%2 == 0) {
+    push @x, undef;
+  }
+  %x = @x;
+  @{$var}{"Default", "Override"} =
+    @x{"DEFAULT", "OVERRIDE"};
+  $var;
+}
+
+sub expand_val($) {
+  my ($val) = @_;
+return undef unless $val;
+	die "Cannot handle PAM items\n" if /(?<!\\)\@/;
+  $val =~ s/(?<!\\)\$\{([^}]+)\}/$ENV{$1}||""/eg;
+  return $val;
+}
+
+my $lookup;
+
+while ($_ = shift) {
+  next if $_ eq "-s";
+  next if $_ eq "-l";
+  $lookup = $_;
+  last;
+}
+unless (defined $lookup) {
+  die "Usage: pam_getenv [-l] [-s] env_var\n";
+}
+
+my %allvars;
+
+open (CONFIGFILE, "/etc/security/pam_env.conf")
+  or die "Cannot open environment file: $!\n";
+
+while (my $var = parse_line(read_line(\*CONFIGFILE))) {
+  my $val;
+  unless ($val = expand_val($var->{Override})) {
+    $val = expand_val($var->{Default});
+  }
+  $allvars{$var->{Name}} = $val;
+}
+
+if (open (ENVFILE, "/etc/environment")) {
+  while (my $line = read_line(\*ENVFILE)) {
+    $line =~ s/^export //;
+    $line =~ /(.*?)=(.+)/ or next;
+    my ($var, $val) = ($1, $2);
+    # This is bizarre logic (" and ' match each other, quotes are only
+    # significant at the start and end of the string, and the trailing quote
+    # may be omitted), but it's what pam_env does.
+    $val =~ s/^["'](.*?)["']?$/$1/;
+    $allvars{$var} = $val;
+  }
+}
+
+if (exists $allvars{$lookup}) {
+  print $allvars{$lookup}, "\n";
+  exit(0);
+}