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# Subroutines shared by the "adduser" and "deluser" utilities. # # Copyright (C) 2000 Roland Bauerschmidt <rb@debian.org> # # Most subroutines here are adopted from Debian's original "adduser" # program. # # Copyright (C) 1997-1999 Guy Maor <maor@debian.org> # # Copyright (C) 1995 Ted Hajek <tedhajek@boombox.micro.umn.edu> # Ian A. Murdock <imurdock@gnu.ai.mit.edu> use File::Basename; use Fcntl qw(:flock SEEK_END); use constant PROGNAME => basename($0); use vars qw(@EXPORT $VAR1); my $lockfile; @EXPORT = ( 'debugf', 'dief', 'get_group_members', 'gtx', 'read_config', 'read_pool', 's_print', 's_printf', 'systemcall', 'systemcall_or_warn', 'systemcall_silent', 'warnf', 'acquire_lock', 'release_lock' ); sub gtx { return gettext( shift ); } sub dief { my ($form, @argu) = @_; printf STDERR sprintf(gtx('%s: %s'), PROGNAME, $form), @argu; exit 1; } sub warnf { my ($form, @argu) = @_; printf STDERR sprintf(gtx('%s: %s'), PROGNAME, $form), @argu; } sub debugf { my ($form, @argu) = @_; if ( $verbose == 2 ) { printf STDERR sprintf('DEBUG: %s: %s', PROGNAME, $form), @argu; } } # parse the configuration file # parameters: # -- filename of the configuration file # -- a hash for the configuration data sub read_config { my ($conf_file, $configref) = @_; my ($var, $lcvar, $val); if (! -f $conf_file) { warnf gtx("`%s' does not exist. Using defaults.\n"),$conf_file if $verbose; return; } open (CONF, $conf_file) || dief ("%s: `%s'\n",$conf_file,$!); while (<CONF>) { chomp; next if /^#/ || /^\s*$/; if ((($var, $val) = m/^\s*([_a-zA-Z0-9]+)\s*=\s*(.*)/) != 2) { warnf gtx("Couldn't parse `%s', line %d.\n"),$conf_file,$.; next; } $lcvar = lc $var; if (!exists($configref->{$lcvar})) { warnf gtx("Unknown variable `%s' at `%s', line %d.\n"),$var,$conf_file,$.; next; } $val =~ s/^"(.*)"$/$1/; $val =~ s/^'(.*)'$/$1/; $configref->{$lcvar} = $val; } close CONF || die "$!"; } # read names and IDs from a pool file # parameters: # -- filename of the pool file, or directory containing files # -- a hash for the pool data sub read_pool { my ($pool_file, $type, $poolref) = @_; my ($name, $id); my %ids = (); my %new; if (-d $pool_file) { opendir (DIR, $pool_file) or dief gtx("Cannot read directory `%s'"),$pool_file; my @files = readdir (DIR); closedir (DIR); foreach (sort @files) { next if (/^\./); next if (!/\.conf$/); my $file = "$pool_file/$_"; next if (! -f $file); read_pool ($file, $type, $poolref); } return; } if (! -f $pool_file) { warnf gtx("`%s' does not exist.\n"),$pool_file if $verbose; return; } open (POOL, $pool_file) || dief ("%s: `%s'\n",$pool_file,$!); while (<POOL>) { chomp; next if /^#/ || /^\s*$/; if ($type eq "uid") { ($name, $id, $comment, $home, $shell) = split (/:/); if (!$name || $name !~ /^([_a-zA-Z0-9-]+)$/ || !$id || $id !~ /^(\d+)$/) { warnf gtx("Couldn't parse `%s', line %d.\n"),$pool_file,$.; next; } $new = { 'id' => $id, 'comment' => $comment, 'home' => $home, 'shell' => $shell }; } elsif ($type eq "gid") { ($name, $id) = split (/:/); if (!$name || $name !~ /^([_a-zA-Z0-9-]+)$/ || !$id || $id !~ /^(\d+)$/) { warnf gtx("Couldn't parse `%s', line %d.\n"),$pool_file,$.; next; } $new = { 'id' => $id, }; } else { dief gtx("Illegal pool type `%s' reading `%s'.\n"),$type,$pool_file; } if (defined($poolref->{$name})) { dief gtx("Duplicate name `%s' at `%s', line %d.\n"),$name,$pool_file,$.; } if (defined($ids{$id})) { dief gtx("Duplicate ID `%s' at `%s', line %d.\n"),$id,$pool_file,$.; } $poolref->{$name} = $new; } close POOL || die "$!"; } sub get_group_members { my $group = shift; my @members; foreach my $member (split(/ /, (getgrnam($group))[3])) { push(@members, $member) if defined(getpwnam($member)); } return @members; } sub s_print { if($verbose) { print join(" ",@_); } } sub s_printf { if($verbose) { printf @_; } } sub d_printf { if((defined($verbose) && $verbose > 1) || (defined($debugging) && $debugging == 1)) { printf @_; } } sub systemcall { my $c = join(' ', @_); if( $verbose==2 ) { print ("$c\n"); } if (system(@_)) { if ($?>>8) { dief (gtx("`%s' returned error code %d. Exiting.\n"), $c, $?>>8) } dief (gtx("`%s' exited from signal %d. Exiting.\n"), $c, $?&127); } } sub systemcall_or_warn { my $command = join(' ', @_); if( $verbose==2 ) { print ("$c\n"); } system(@_); if ($? == -1) { warnf(gtx("`%s' failed to execute. %s. Continuing.\n"), $command, "$!"); } elsif ($? & 127) { warnf(gtx("`%s' killed by signal %d. Continuing.\n"), $command, ($? & 127)); } elsif ($? >> 8) { warnf(gtx("`%s' failed with status %d. Continuing.\n"), $command, ($? >> 8)); } return $?; } sub systemcall_silent { my $pid = fork(); if( !defined($pid) ) { return -1; } if ($pid) { wait; return $?; } open(STDOUT, '>>', '/dev/null'); open(STDERR, '>>', '/dev/null'); # TODO: report exec() failure to parent exec(@_) or exit(1); } sub systemcall_silent_error { my $command = join(' ', @_); my $output = `$command >/dev/null 2>&1`; return $?; } sub which { my ($progname, $nonfatal) = @_ ; for my $dir (split /:/, $ENV{"PATH"}) { if (-x "$dir/$progname" ) { return "$dir/$progname"; } } dief(gtx("Could not find program named `%s' in \$PATH.\n"), $progname) unless ($nonfatal); return 0; } # preseed the configuration variables # then read the config file /etc/adduser and overwrite the data hardcoded here # we cannot give defaults for users_gid and users_group here since this will # probably lead to double defined users_gid and users_group. sub preseed_config { my ($conflistref, $configref) = @_; my %config_defaults = ( system => 0, only_if_empty => 0, remove_home => 0, home => "", remove_all_files => 0, backup => 0, backup_to => ".", dshell => "/bin/bash", first_system_uid => 100, last_system_uid => 999, first_uid => 1000, last_uid => 59999, first_system_gid => 100, last_system_gid => 999, first_gid => 1000, last_gid => 59999, dhome => "/home", skel => "/etc/skel", usergroups => "yes", users_gid => undef, users_group => undef, grouphomes => "no", letterhomes => "no", quotauser => "", dir_mode => "0700", sys_dir_mode => "0755", setgid_home => "no", no_del_paths => "^/bin\$ ^/boot\$ ^/dev\$ ^/etc\$ ^/initrd ^/lib ^/lost+found\$ ^/media\$ ^/mnt\$ ^/opt\$ ^/proc\$ ^/root\$ ^/run\$ ^/sbin\$ ^/srv\$ ^/sys\$ ^/tmp\$ ^/usr\$ ^/var\$ ^/vmlinu", name_regex => "^[a-z][a-z0-9_-]*\\\$?\$", sys_name_regex => "^[a-z_][a-z0-9_-]*\\\$?\$", exclude_fstypes => "(proc|sysfs|usbfs|devpts|devtmpfs|devfs|afs)", skel_ignore_regex => "\.(dpkg|ucf)-(old|new|dist)\$", extra_groups => "users", add_extra_groups => 0, uid_pool => "", gid_pool => "", ); # Initialize to the set of known variables. foreach (keys %config_defaults) { $configref->{$_} = $config_defaults{$_}; } # Read the configuration files foreach( @$conflistref ) { debugf("read configuration file %s\n", $_); read_config($_,$configref); } } sub acquire_lock { my $lockfile_path = '/run/adduser'; my @notify_secs = (1, 3, 8, 18, 28); my ($wait_secs, $timeout_secs) = (0, 30); open($lockfile, '>>', $lockfile_path) or dief "could not open lock file %s!\n", $lockfile_path; while (!flock($lockfile, LOCK_EX | LOCK_NB)) { if ($wait_secs == $timeout_secs) { dief gtx("Could not obtain exclusive lock, please try again shortly!"); } elsif (grep @notify_secs, $wait_secs) { warnf gtx("Waiting for lock to become available...\n"); } sleep 1; $wait_secs++; } seek($lockfile, 0, SEEK_END) or dief "could not seek - %s!\n", $lockfile_path; } sub release_lock { my $nonfatal = shift || 0; return if ($nonfatal && !$lockfile); dief "could not find lock file!" unless $lockfile; flock($lockfile, LOCK_UN) or $nonfatal or die "could not unlock file $lockfile_path: $! !\n"; close($lockfile) or $nonfatal or die "could not close lock file $lockfile_path: $! !\n"; } END { release_lock(1); } # Local Variables: # mode:cperl # End: # vim: tabstop=4 shiftwidth=4 expandtab