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Current File : /usr/share/insserv/check-initd-order
#!/usr/bin/perl
#
# Author: Petter Reinholdtsen
# Date:   2005-08-21
#
# Read LSM init.d headers in SysV init.d scripts, and verify correct
# start order for all runlevels.  It can also provide a graph.
#
# To generate a graph, run it like this
#
#   check-initd-order -g > initorder.dotty && dotty initorder.dotty

use strict;
use warnings;

my $rcbase = "/etc";

my $overridepath = "/usr/share/insserv/overrides";
my $hostoverridepath =  "/etc/insserv/overrides";

my $debug = 0;
my $errors = 0;

my %rcmap =
    (
     'B' => 'rc.boot',
     'S' => 'rcS.d',
     '1' => 'rc1.d',
     '2' => 'rc2.d',
     '3' => 'rc3.d',
     '4' => 'rc4.d',
     '5' => 'rc5.d',
     '6' => 'rc6.d',
     );

my %sysmap;

my %provideslist;
my %scriptorder;
my %opts;

# Used to draw graphs
my %gotrevdeps;
my %allprovides;

while($#ARGV >= 0 && ($_ = $ARGV[0]) =~ /^-/) {
        shift @ARGV;
        if (/^-([cdgko])$/) { $opts{$1}++; next }
        if (/^-b$/) { $rcbase = shift; next }
        if (/^-h|--help$/) { &usage; }
        &usage("unknown option");
}

load_sysmap("$rcbase/insserv.conf");

$debug = $opts{'d'};
my $useoverrides = $opts{'o'} ? 0 : 1;

if ($opts{'g'}) {
    graph_generate();
    exit 0;
}

check_bootorder();
exit $errors > 0 ? 1 : 0;

sub usage {
    print STDERR "check-initd-order: error: @_\n" if ($#_ >= 0);
    print STDERR <<EOF;
usage: check-initd-order [-cdgko] [-b basedir]
  -b basedir (default /etc)
  -d enable debug output
  -o do not load override files
  -k use shutdown (reboot) sequence instead of boot sequence
  -g generate graph
  -c use combined boot and shutdown sequence (only for graphs)
EOF
    exit 1;
}

# Simple basename implementatin to avoid dependin on File::Basename
# from perl-modules
sub basename {
    my $path = shift;
    $path =~ s%^.*/([^/]+)$%$1%;
    return $path;
}

sub error {
    print STDERR "error: ", @_;
    $errors++;
}

# Map packages to system metapackages.  These dependencies should
# probably be more complex
sub load_sysmap {
    my $filename = shift;
    unless (open(CONF, "<", "$filename")) {
        print STDERR "error: unable to load $filename";
        return;
    }
    while (<CONF>) {
        chomp;
        s/\#.*$//;
        next if m/^\s*$/;
        if (m/^(\$\S+)\s+(\S.*\S*)\S*$/) {
            my $virt = $1;
            for my $dep (split(/\s+/, $2)) {
                $dep =~ s/^\+//g;
                $sysmap{$dep} = $virt;
            }
        }
    }
    close(CONF);
}

sub graph_addnode {
    my ($isstopseq, $lsbinforef) = @_;
    my %lsbinfo = %{$lsbinforef};

    unless ($lsbinfo{'provides'}) {
        error "File ". $lsbinfo{'file'} . " is missing the provides header\n";
        $lsbinfo{'provides'} = $lsbinfo{'file'};
        $lsbinfo{'provides'} =~ s/^[SK]\d{2}//;
    }

    my $key = $opts{'k'} ? 'stop' : 'start';
    my $revkey = $opts{'k'} ? 'stop-after' : 'start-before';
    my @provides = split(/\s+/, $lsbinfo{'provides'});
    for my $name (@provides) {
        if (exists $sysmap{$name}) {
            graph_addnode($isstopseq,
                          {'provides'      => $sysmap{$name},
                          "required-$key" => $name});
        }
    }

    if (1 < @provides) {
        my @providescopy = @provides;
        my $lastprovide = shift @providescopy;
        for my $provide (@providescopy) {
            graph_addnode($isstopseq,
                          {'provides'      => $lastprovide,
                           "required-$key" => $provide});
            graph_addnode($isstopseq,
                          {'provides'      => $provide,
                           "required-$key" => $lastprovide});
        }
    }

    for my $provide (@provides) {
        my $provideesc = $provide; $provideesc =~ s/"/\\"/g;
        my %deps =
            (
             "required-$key" => 'blue',
             "should-$key" => 'springgreen',
             "$revkey" => 'yellow'
             );

        for $key (keys %deps) {
            if (exists $lsbinfo{$key} && $lsbinfo{$key}) {
                my @depends = split(/\s+/, $lsbinfo{$key});

                my $dependonall = 0;
                for my $pkg (@depends) {
                    $dependonall = 1 if ($pkg eq '$all');
                }

                for my $pkg (@depends) {
                    my $pkgesc = $pkg; $pkgesc =~ s/"/\\"/g;
                    my $color = $deps{$key};
                    if ($revkey eq $key) {
                        print "\"$provideesc\" -> \"$pkgesc\"[color=$color] ;\n";
                        $gotrevdeps{$pkg} = 1 unless $dependonall;
                    } else {
                        print "\"$pkgesc\" -> \"$provideesc\"[color=$color] ;\n";
                        $gotrevdeps{$provide} = 1 unless $dependonall;
                    }
                }
            }
        }

        print "\"$provideesc\" [shape=box];\n" unless $allprovides{$provide};
        $allprovides{$provide} = 1;
    }
}

sub graph_generate_mode {
    my ($isstopseq) = @_;
    my @dirs = $isstopseq ? $rcmap{6} : ($rcmap{S}, $rcmap{2});
    for my $rcdir (@dirs) {
        chdir "$rcbase/$rcdir/.";
        my @scripts = $isstopseq ? <K*> : <S*>;
        for my $script (@scripts) {
            my $lsbinforef = load_lsb_tags("$rcbase/$rcdir/$script",
                                           $useoverrides);

            unless (defined $lsbinforef) {
                error "LSB header missing in $rcbase/$rcdir/$script\n";
                $script =~ s/^[SK]\d{2}//;
                $lsbinforef = {'provides'       => $script,
                               'required-start' => '$remote_fs $syslog',
                               'required-stop'  => '$remote_fs $syslog'};
            }
            graph_addnode($isstopseq, $lsbinforef);
        }
    }
    # Mark all packages without any reverse dependencies as depending
    # on $all
    for my $provide (keys %allprovides) {
        next unless (exists $gotrevdeps{$provide});
        my $lsbinforef = {'provides'       => '$all',
                          'required-start' => "$provide",
                          'required-stop'  => "$provide"};
        graph_addnode($isstopseq, $lsbinforef);
    }
}

sub graph_generate {
    print "# Generating graph\n";
    print <<EOF;
digraph packages {
rankdir=LR;
concentrate=true;
EOF
    if ($opts{'c'}) {
        graph_generate_mode();
        graph_generate_mode(1);
    } else {
        graph_generate_mode($opts{'k'});
    }
    print <<EOF;
}
EOF
}

sub check_deps {
    my ($lsbinforef, $tag, $order, $bootorder, $headername, $required) = @_;
    my %lsbinfo = %{$lsbinforef};
    my $name = $lsbinfo{'file'};
    if ($lsbinfo{$headername}) {
        my @depends = split(/\s+/, $lsbinfo{$headername});
        for my $dep (@depends) {
            if (! $required && exists $provideslist{$dep}) {
                unless (exists $scriptorder{$tag}{$dep}
                        and ("S" eq $tag
                             ? $scriptorder{$tag}{$dep} < $bootorder
                             : $scriptorder{$tag}{$dep} > $bootorder)) {
                    my $deporder;
                    if (exists $scriptorder{$tag}{$dep}) {
                        $deporder = $scriptorder{$tag}{$dep}
                    } else {
                        $deporder = exists $provideslist{$dep} ? $provideslist{$dep} : "?";
                    }
                    error(sprintf("Incorrect order %s@%s %s %s%s\n",
                           $dep, $deporder, 'S' eq $tag ? '>' : '<',
                           $name, $order));
                }
            }
        }
    }
}

sub check_bootorder {
    my $bootorder = 0;
    my @dirs = $opts{'k'} ? $rcmap{6} : ($rcmap{S}, $rcmap{2});
    my @scripts;
    for my $rcdir (@dirs) {
        push(@scripts, $opts{'k'} ? <$rcbase/$rcdir/K*> : <$rcbase/$rcdir/S*>);
    }

    if ($opts{'k'}) {
        $scriptorder{'K'}{'$all'} = 1;
    } else {
        # Calculate script order for the script before the scripts
        # with the last boot sequence number.
        my $tmpbootorder = 0;
        my $allorder = 0;
        my $maxorder = 0;
        my $maxbootorder = 0;
        for my $scriptpath (@scripts) {
            my $script = $scriptpath;
            $script =~ s%^.*/([^/]+)$%$1%;
            $tmpbootorder++;
            my ($tag, $order, $name) = $script =~ m/^(.)(\d{2})(.+)$/;
            if ($order > $maxorder) {
                $allorder = $maxbootorder;
                $maxbootorder = $tmpbootorder;
                $maxorder = $order;
            }

            my $lsbinforef = load_lsb_tags($scriptpath,
                                           $useoverrides);

            if (exists $lsbinforef->{'provides'}
                && $lsbinforef->{'provides'}) {
                for my $provide (split(/\s+/, $lsbinforef->{'provides'})) {
                    $provideslist{$provide} = $order;
                }
            } else {
                $provideslist{$script} = $order;
            }
        }
        $scriptorder{'S'}{'$all'} = $allorder;
    }
    for my $scriptpath (@scripts) {
        my $script = $scriptpath;
        $script =~ s%^.*/([^/]+)$%$1%;
        $bootorder++;
        my ($tag, $order, $name) = $script =~ m/^(.)(\d{2})(.+)$/;

        $scriptorder{$tag}{$name} = $bootorder;
        $scriptorder{$tag}{$sysmap{$name}} = $bootorder
            if (exists $sysmap{$name});

#           print "$script\n";
#           print "T: $tag O: $order N: $name\n";
        my $lsbinforef = load_lsb_tags($scriptpath,
                                       $useoverrides);

        unless (defined $lsbinforef) {
            error "LSB header missing in $scriptpath\n";
            next;
        }
        my %lsbinfo = %{$lsbinforef};

        if (exists $lsbinfo{'provides'} && $lsbinfo{'provides'}) {
            for my $provide (split(/\s+/, $lsbinfo{'provides'})) {
                $scriptorder{$tag}{$provide} = $bootorder;
                $scriptorder{$tag}{$sysmap{$provide}} = $bootorder
                    if (exists $sysmap{$provide});
            }
        } else {
            error "no LSB header provides value in script $scriptpath\n";
        }

        if ('S' eq $tag) {
            check_deps($lsbinforef, $tag, $order, $bootorder, 'required-start', 1);
            check_deps($lsbinforef, $tag, $order, $bootorder, 'should-start', 0);
#            check_deps($lsbinforef, 'K', $order, $bootorder, 'start-before', 0);
        }
        if ('K' eq $tag) {
            check_deps($lsbinforef, $tag, $order, $bootorder, 'required-stop', 1);
            check_deps($lsbinforef, $tag, $order, $bootorder, 'should-stop', 0);
#            check_deps($lsbinforef, 'S', $order, $bootorder, 'stop-after', 0);
        }
    }
}

sub load_lsb_tags {
    my ($initfile, $useoverrides) = @_;
    my $lsbinforef = load_lsb_tags_from_file($initfile);

    if ($useoverrides) {
        # Try override file
        $initfile = readlink($initfile) if (-l $initfile);
        my $basename = basename($initfile);

        # Only read shipped override file when initscript does not
        # contain LSB tags.
        if (! defined($lsbinforef) && -f "$overridepath/$basename") {
            print STDERR "Override $overridepath/$basename\n" if $debug;
            $lsbinforef = load_lsb_tags_from_file("$overridepath/$basename");
        }

        # Always read the host override in $hostoverridepath.
        if (-f "$hostoverridepath/$basename") {
            print STDERR "Override $hostoverridepath/$basename\n" if $debug;
            $lsbinforef = load_lsb_tags_from_file("$hostoverridepath/$basename");
        }

    }
    return $lsbinforef;
}

sub load_lsb_tags_from_file {
    my ($file) = @_;
    print STDERR "Loading $file\n" if $debug;
    ### BEGIN INIT INFO
    # Provides:          xdebconfigurator
    # Required-Start:    $syslog
    # Required-Stop:     $syslog
    # Default-Start:     2 3 4 5
    # Default-Stop:      1 6
    # Short-Description: Genererate xfree86 configuration at boot time
    # Description:       Preseed X configuration and use dexconf to
    #                    genereate a new configuration file.
    ### END INIT INFO
    unless (open(FILE, "<$file")) {
        warn "error: Unable to read $file";
        return;
    }
    my $found = 0;
    my ($provides, $requiredstart, $requiredstop, $shouldstart, $shouldstop);
    my ($startbefore, $stopafter);
    while (<FILE>) {
        chomp;
        $found = 1 if (m/\#\#\# BEGIN INIT INFO/);
        next unless $found;
        last if (m/\#\#\# END INIT INFO/);

        $provides = $1      if (m/^\# provides:\s+(\S*.*\S+)\s*$/i);
        $requiredstart = $1 if (m/^\# required-start:\s+(\S*.*\S+)\s*$/i);
        $requiredstop = $1  if (m/^\# required-stop:\s+(\S*.*\S+)\s*$/i);
        $shouldstart = $1   if (m/^\# should-start:\s+(\S*.*\S+)\s*$/i);
        $shouldstop = $1    if (m/^\# should-stop:\s+(\S*.*\S+)\s*$/i);
        $startbefore = $1   if (m/^\# X-Start-Before:\s+(\S*.*\S+)\s*$/i);
        $stopafter = $1     if (m/^\# X-Stop-After:\s+(\S*.*\S+)\s*$/i);
    }
    close(FILE);

    return undef unless ($found);

#    print "Provides: $provides\n" if $provides;
    return {
            'provides'       => $provides,
            'required-start' => $requiredstart,
            'required-stop'  => $requiredstop,
            'should-start'   => $shouldstart,
            'should-stop'    => $shouldstop,
            'start-before'   => $startbefore,
            'stop-after'     => $stopafter,
            'file'           => $file,
            };
}

Youez - 2016 - github.com/yon3zu
LinuXploit