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|
#! /usr/bin/perl
# -*- Mode: Perl -*-
# This script created automatically from scripts/check_root_fs.in
# $Header: /var/cvsroot/gentoo-x86/sys-apps/yard/files/yard-2.0/sbin/check_root_fs,v 1.1 2001/04/09 03:01:00 achim Exp $
##############################################################################
##
## CHECK_ROOT_FS
## Copyright (C) 1996,1997,1998 Tom Fawcett (fawcett@croftj.net)
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## 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.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
##
##
##############################################################################
use strict;
use File::Basename;
use File::Path;
use FileHandle;
use English;
use lib "/etc/yard", "/usr/lib/yard";
use yardconfig;
use File::Find;
BEGIN { require "yard_utils.pl" }
require "Config.pl";
### GLOBAL VARIABLES
my(%Termcap); # Defs from /etc/termcap
my($checked_for_getty_files); # Scalar -- have we checked getty files yet?
my(%checked); # Hash table of files we've already checked
# This is a little crude. Technically we should read /etc/conf.getty
# to make sure we're not supposed to be using a different login binary.
my($login_binary) = "$CFG::mount_point/bin/login";
STDOUT->autoflush(1);
start_logging_output();
info 0, "check_root_fs 2.0\n";
mount_device_if_necessary();
# This goes first so we define %Termcap for use in children
check_termcap();
##### Here are the tests.
fork_chroot_and(\&check_fstab);
fork_chroot_and(\&check_inittab);
fork_chroot_and(\&check_scripts);
check_links();
check_passwd();
check_pam();
check_nss();
info 0, "All done.\n";
info 0, "If this is acceptable, continue with write_rescue_disk\n";
exit;
##############################################################################
sub warning {
info 0, "\n", @_;
# $::Warnings++;
}
# This takes a procedure call, forks off a subprocess, chroots to
# $CFG::mount_point and runs the procedure.
sub fork_chroot_and {
my($call) = @_;
my($Godot) = fork;
die "Can't fork: $!" unless defined $Godot;
if (!$Godot) {
# Child process
chdir($CFG::mount_point);
chroot($CFG::mount_point); ##### chroot to the root filesystem
&$call;
exit;
} else {
# Parent here
waitpid($Godot, 0);
}
}
sub check_fstab {
my($FSTAB) = "/etc/fstab";
my($proc_seen);
open(FSTAB, "<$FSTAB") or error "$FSTAB: $!";
info 0, "\nChecking $FSTAB\n";
while (<FSTAB>) {
chomp;
next if /^\#/ or /^\s*$/;
my($dev, $mp, $type, $opts) = split;
next if $mp eq 'none' or $type eq 'swap';
next if $dev eq 'none';
if (!-e $mp) {
info 0, "$FSTAB($.): $_\n\tCreating $mp on root filesystem\n";
mkpath($mp);
}
if ($dev !~ /:/ and !-e $dev) {
warning "$FSTAB($.): $_\n\tDevice $dev does not exist "
. "on root filesystem\n";
}
##### If you use the file created by create_fstab, these tests
##### are superfluous.
if ($dev =~ m|^/dev/hd| and $opts !~ /noauto/) {
warning "\t($.): You probably should include \"noauto\" option\n",
"\tin the fstab entry of a hard disk. When the rescue floppy\n",
"\tboots, the \"mount -a\" will try to mount $dev\n";
} elsif ($dev eq $CFG::floppy and $type ne 'ext2' and $type ne 'auto') {
warning "\t($.): You've declared your floppy drive $CFG::floppy",
" to hold\n",
"\ta $type filesystem, which is not ext2. The rescue floppy\n",
"\tis ext2, which may confuse 'mount -a' during boot.\n";
} elsif ($type eq 'proc') {
$proc_seen = 1;
}
}
close(FSTAB);
warning "\tNo /proc filesystem defined.\n" unless $proc_seen;
info 0, "Done with $FSTAB\n";
}
sub check_inittab {
my($INITTAB) = "/etc/inittab";
info 0, "\nChecking $INITTAB\n";
if (!open(INITTAB, "<$INITTAB")) {
warning "$INITTAB: $!\n";
return
}
my($default_rl, $saw_line_for_default_rl);
while (<INITTAB>) {
chomp;
my($line) = $_; # Copy for errors
s/\#.*$//; # Delete comments
next if /^\s*$/; # Skip empty lines
my($code, $runlevels, $action, $command) = split(':');
if ($action eq 'initdefault') { ##### The initdefault runlevel
$default_rl = $runlevels;
next;
}
if ($runlevels =~ /$default_rl/) {
$saw_line_for_default_rl = 1;
}
if ($command) {
my($exec, @args) = split(' ', $command);
if (!-f $exec) {
warning "$INITTAB($.): $line\n",
"\t$exec: non-existent or non-executable\n";
} elsif (!-x $exec) {
info 0, "$INITTAB($.): $line\n",
info 0, "\tMaking $exec executable\n";
chmod(0777, $exec) or error "chmod failed: $!";
} else {
##### executable but not binary ==> script
scan_command_file($exec, @args) if !-B $exec;
}
if ($exec =~ m|getty|) { # matches *getty* call
check_getty_type_call($exec, @args);
}
}
}
close(INITTAB) or error "close(INITTAB): $!";
if (!$saw_line_for_default_rl) {
warning "\tDefault runlevel is $default_rl, but no entry for it.\n";
}
info 0, "Done with $INITTAB\n";
}
##### This could be made much more complete, but for typical rc type
##### files it seems to catch the common problems.
sub scan_command_file {
my($cmdfile, @args) = @_;
my(%warned, $line);
return if $checked{$cmdfile};
info 0, "\nScanning $cmdfile\n";
open(CMDFILE, "<$cmdfile") or error "$cmdfile: $!";
while ($line = <CMDFILE>) {
chomp($line);
next if $line =~ /^\#/ or /^\s*$/;
next if $line =~ /^\w+=/;
while ($line =~ m!(/(usr|var|bin|sbin|etc|dev)/\S+)(\s|$)!g) {
my($abs_file) = $1;
# next if $abs_file =~ m/[*?]/; # Skip meta chars - we don't trust glob
next if $warned{$abs_file}; # Only warn once per file
if (!-e $abs_file) {
warning "$cmdfile($.): $line\n\t$1: missing on root filesystem\n";
$warned{$abs_file} = 1;
}
}
}
close(CMDFILE) or error "close($cmdfile): $!";
$checked{$cmdfile} = 1;
info 0, "Done scanning $cmdfile\n";
}
##### Check_passwd is NOT run under chroot.
sub check_passwd {
my($passwd_file) = "$CFG::mount_point/etc/passwd";
open(PASSWD, "<$passwd_file") or error "Can't read passwd file: $!\n";
info 0, "\nChecking passwd file $passwd_file\n";
while (<PASSWD>) {
chomp;
next if /^\s*$/; # Skip blank/empty lines
my($line) = $_;
my($login_name, $passwd, $UID, $GID, $user_name, $home, $shell) =
split(':');
next if $passwd eq "*"; # Skip warnings if user can't login
-d ($CFG::mount_point . $home) or
warning "$passwd_file($.): $line\n",
"\tHome directory of $login_name ($CFG::mount_point$home) is missing\n";
-e ($CFG::mount_point . $shell) or
warning "$passwd_file($.): $line\n",
"\tShell of $login_name ($CFG::mount_point$shell) doesn't exist\n";
check_init_files($login_name, $home, $shell);
}
close(PASSWD);
info 0, "Done checking $passwd_file\n";
}
##### Simple PAM configuration checks.
##### Tests whether PAM is needed, and whether the configuration libraries exist.
##### Check_pam is NOT run under chroot.
sub check_pam {
my($pam_configured) = 0; # Have we seen some pam config file yet?
info 0, "Checking for PAM\n";
my($pamd_dir) = "$CFG::mount_point/etc/pam.d";
my($pam_conf) = "$CFG::mount_point/etc/pam.conf";
if (-e $pam_conf) {
info 0, "Checking $pam_conf\n";
$pam_configured = 1;
open(PAM, $pam_conf) or error "Can't open pam.conf: $!\n";
while (<PAM>) {
chomp;
next if /^\#/ or /^\s*$/; # Skip comments and empty lines
my($file) = (split)[3]; # Get fourth field
if (!-e "$CFG::mount_point/$file") {
warning "$pam_conf($.): $_\n",
"\tLibrary $file does not exist on root fs\n";
}
# That's all we check for now
}
close(PAM) or die "Closing PAM: $!";
info 0, "Done with $pam_conf\n";
}
if (-e $pamd_dir) {
info 0, "Checking files in $pamd_dir\n";
opendir(PAMD, $pamd_dir) or error "Can't open $pamd_dir: $!";
my($file);
while (defined($file = readdir(PAMD))) {
my($file2) = "$pamd_dir/$file";
next unless -f $file2; # Skip directories, etc.
open(PF, $file2) or error "$file2: $!";
while (<PF>) {
chomp;
next if /^\#/ or /^\s*$/; # Skip comments and empty lines
my($file) = (split)[3]; # Get fourth field
$pam_configured = 1;
if (!-e "$CFG::mount_point/$file") {
warning "$file2($.): $_\n",
"\tLibrary $file does not exist on root fs\n";
}
}
close(PF);
}
closedir(PAMD);
}
# Finally, see whether PAM configuration is needed
if (!$pam_configured and -e $login_binary) {
my($dependencies) = scalar(`ldd $login_binary`);
if (defined($dependencies) and $dependencies =~ /libpam/) {
warning "Warning: login ($login_binary) needs PAM, but you haven't\n",
"\tconfigured it (in /etc/pam.conf or /etc/pam.d/)\n",
"\tYou probably won't be able to login.\n";
}
}
info 0, "Done with PAM\n";
}
##### Basic checks for nsswitch.conf.
##### check_nss is NOT run under chroot.
##### From the nsswitch.conf(5) manpage:
##### For glibc, you must have a file called /lib/libnss_SERVICE.so.X for
##### every SERVICE you are using. On a standard installation, you could
##### use `files', `db', `nis' and `nisplus'. For hosts, you could specify
##### `dns' as extra service, for passwd, group and shadow `compat'. These
##### services will not be used by libc5 with NYS. The version number X
##### is 1 for glibc 2.0 and 2 for glibc 2.1.
sub check_nss {
my($nss_conf) = "$CFG::mount_point/etc/nsswitch.conf";
info 0, "Checking for NSS\n";
my($libc) = yard_glob("$CFG::mount_point/lib/libc-2*");
my($libc_version) = $libc =~ m|/lib/libc-2.(\d)|;
if (!defined($libc_version)) {
warning "Can't determine your libc version\n";
} else {
info 0, "You're using $libc\n";
}
my($X) = $libc_version;
if (-e $nss_conf) {
open(NSS, "<$nss_conf") or die "open($nss_conf): $!";
my($line);
while (defined($line = <NSS>)) {
chomp $line;
next if $line =~ /^\#/;
next if $line =~ /^\s*$/;
my($db, $entries) = $line =~ m/^(\w+):\s*(.+)$/;
# Remove bracketed expressions (action specifiers)
$entries =~ s/\[[^\]]*\]//g;
my(@entries) = split(' ', $entries);
my($entry);
for $entry (@entries) {
next if $entry =~ /^\[/; # ignore action specifiers
my($lib) = "$CFG::mount_point/lib/libnss_${entry}.so.${X}";
if (!-e $lib) {
warning "$nss_conf($.):\n$line\n",
"\tRoot filesystem needs $lib to support $entry\n";
}
}
}
} else {
# No nsswitch.conf is present, figure out if maybe there should be one.
if (-e $login_binary) {
my($dependencies) = scalar(`ldd $login_binary`);
my($libc_version) = ($dependencies =~ /libc\.so\.(\d+)/m);
if ($libc_version > 5) {
# Needs libc 6 or greater
warning "Warning: $login_binary on rescue disk needs libc.so.$libc_version,\n"
. "\tbut there is no NSS configuration file ($nss_conf)\n"
. "\ton root filesystem.\n";
}
}
}
info 0, "Done with NSS\n";
}
sub check_links {
info 0, "\nChecking links relative to $CFG::mount_point\n";
sub wanted {
if (-l $File::Find::name) {
local($::raw_link) = readlink($File::Find::name);
local($::target) = make_link_absolute($File::Find::name, $::raw_link);
# I added this next test for /dev/stdout link hair.
# This really should be more complicated to handle link chains,
# but as a hack this works for three.
if (onto_proc_filesystem($File::Find::name)) {
} elsif (-l $::target) {
chase_link($::target, 16);
} elsif (!-e $::target) {
warning "Warning: Unresolved link: $File::Find::name -> $::raw_link\n";
}
}
};
finddepth(\&wanted, $CFG::mount_point);
}
sub chase_link {
my($file, $link_depth) = @_;
if ($link_depth == 0) {
warning "Warning: Probable link circularity involving $file\n";
} elsif (-l $file) {
chase_link(make_link_absolute($file, readlink($file)),
$link_depth-1);
}
}
sub check_scripts {
info 0, "\nChecking script interpreters\n";
local($::prog);
sub check_interpreter {
if (-x $File::Find::name and -f _ and -T _) {
open(SCRIPT, $File::Find::name) or error "$File::Find::name: $!";
my($prog, $firstline);
chomp($firstline = <SCRIPT>);
if (($prog) = $firstline =~ /^\#!\s*(\S+)/) {
if (!-e $prog) {
warning "Warning: $File::Find::name needs $prog, which is missing\n";
} elsif (!-x $prog) {
warning "Warning: $File::Find::name needs $prog, " .
"which is not executable.\n";
}
}
close(SCRIPT);
}
}; # End of sub check_interpreter
find(\&check_interpreter, "/");
}
sub check_getty_type_call {
my($prog, @args) = @_;
if ($prog eq 'getty') {
my($tty, $speed, $type) = @args;
if (!-e "$CFG::mount_point/dev/$tty") {
warning "\tLine $.: $prog for $tty, but /dev/$tty doesn't exist.\n";
}
if (!defined($Termcap{$type})) {
warning "\tLine $.: Type $type not defined in termcap\n";
}
}
## If getty or getty_ps, look for /etc/gettydefs, /etc/issue
## Check that term type matches one in termcap db.
if ($prog =~ /^getty/) {
if (!$checked_for_getty_files) {
warning "\tLine $.: $prog expects /etc/gettydefs, which is missing.\n"
unless -e "$CFG::mount_point/etc/gettydefs";
warning "\tLine $.: $prog expects /etc/issue, which is missing.\n"
unless -e "$CFG::mount_point/etc/issue";
$checked_for_getty_files = 1;
}
}
}
###
### NB. This is *not* run under chroot
###
sub check_init_files {
my($user, $home, $shell) = @_;
info 0, "Checking init files of $user (homedir= $home)\n";
my($shellname) = basename($shell);
my @init_files;
##### Try to infer the list of init files to be run for the shell
##### of this user. Order is somewhat important here because of
##### the search path.
if ($shellname =~ /^(bash|sh)$/) {
@init_files = ("/etc/profile", "/etc/bashrc",
"$home/.profile", "$home/.bash_login", "$home/.bashrc",
"$home/.shrc");
} elsif ($shellname eq "ash") {
@init_files = ("/etc/profile", "$home/.profile");
} elsif ($shellname =~ /^(tcsh|csh)$/) {
@init_files = ("/etc/csh.cshrc", "/etc/.cshrc", "/etc/csh.login",
"$home/.cshrc", "$home/.tcshrc", "$home/.login");
}
##### The path to be searched. This may be error prone.
my(@path) = ();
my($init_file);
foreach $init_file (@init_files) {
$init_file = $CFG::mount_point . $init_file;
next if $checked{$init_file} or !-r $init_file;
info 0, "Checking $init_file\n";
open(INITF, "<$init_file") or die "$init_file: $!";
while (<INITF>) {
chomp;
next if /^\#/ or /^\s*$/; # Skip comments, whitespace
my($var, $val);
if (($var, $val) = /^\s*(\w+)\s*=\s*(.*)\s*$/) { # Variable assignment
##### Look for PATH assignment
if ($var eq "PATH") {
$val =~ s/^[\"\'](.*)[\"\']$/$1/; # Strip quotes
@path = split(':', $val);
info 1, "Using PATH: ", join(':', @path), "\n";
} else {
next; # Skip other assignments
}
}
my($cmd, $hd_abs);
##### Check for commands that aren't present
($cmd) = /^(\w+)\b/; # Pick up cmd name
if ($cmd and ($hd_abs = find_file_in_path($cmd, @path))) {
# If it's here, see if it's on the rescue disk
if (!(-e "$CFG::mount_point/$hd_abs" and -x _)) {
warning "$init_file($.): $_\n\t\t$cmd looks like a command but\n",
"\t\tdoes not exist on the root filesystem.\n";
}
}
# Check for commands in backticks that aren't present
($cmd) = /\`(\w+)\b/;
if ($cmd and ($hd_abs=find_file_in_path($cmd))) {
# If it's here, see if it's on the rescue disk
# Note that this could mislead if the user moved it to a different
# dir on the root fs.
if (!-e "$CFG::mount_point/$hd_abs") {
warning "${init_file}($.): $_\n\t$cmd: missing from root fs.\n";
} elsif (!-x _) {
warning "$init_file($.): $_\n\t$cmd: not executable on root fs.\n";
}
}
}
close(INITF);
info 0, "Done with $init_file\n";
$checked{$init_file} = 1;
} # end of foreach
}
sub check_termcap {
open(TERMCAP, "<$CFG::mount_point/etc/termcap") or
warning "No file $CFG::mount_point/etc/termcap";
while (<TERMCAP>) {
chomp;
next unless $_;
next if /^\#/; # Skip comments
next if /^\s+/; # Skip non-head lines
##### Get complete logical line
my($def) = $_;
while (/\\$/) { # Trailing backslash => continued
chomp($def); # Discard backslash
chomp($_ = <TERMCAP>); # Get a line, w/o newline char
$def .= $_;
}
##### Extract terminal names from line
my($names) = $def =~ /^([^:]+):/;
my(@terms) = split(/\|/, $names);
@Termcap{@terms} = (1) x ($#terms + 1);
}
close(TERMCAP);
}
##### END OF CHECK_ROOT_FS
|