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# DebianNet.pm: a perl module to add entries to the /etc/inetd.conf file
#
# Copyright (C) 1995, 1996 Peter Tobias <tobias@et-inf.fho-emden.de>
# Ian Jackson <iwj10@cus.cam.ac.uk>
#
#
# DebianNet::add_service($newentry, $group);
# DebianNet::disable_service($service, $pattern);
# DebianNet::enable_service($service, $pattern);
# DebianNet::remove_service($entry);
#
package DebianNet;
require 5.6.1;
use Debconf::Client::ConfModule ':all';
use File::Temp qw/ tempfile /;
use File::Copy qw/ move /;
$inetdcf="/etc/inetd.conf";
$sep = "#<off># ";
$version = "1.12";
$called_wakeup_inetd = 0;
sub add_service {
local($newentry, $group) = @_;
local($service, $searchentry, @inetd, $inetdconf, $found, $success);
unless (defined($newentry)) { return(-1) };
chomp($newentry);
if (defined $group) {
chomp($group);
} else {
$group = "OTHER";
}
$group =~ tr/a-z/A-Z/;
$newentry =~ s/\\t/\t/g;
($service = $newentry) =~ s/(\W*\w+)\s+.*/$1/;
($sservice = $service) =~ s/^#([A-Za-z].*)/$1/;
($searchentry = $newentry) =~ s/^$sep//;
$searchentry =~ s/^#([A-Za-z].*)/$1/;
# strip parameter from entry (e.g. -s /tftpboot)
# example: service dgram udp wait root /tcpd /prg -s /tftpboot";
$searchentry =~ s/^(\w\S+\W+\w+\W+\w\S+\W+\w\S+\W+\w\S+\W+\S+\W+\S+).*/$1/;
$searchentry =~ s/[ \t]+/ /g;
$searchentry =~ s/ /\\s+/g;
$searchentry =~ s@\\s\+/\S+\\s\+/\S+@\\s\+\\S\+\\s\+\\S\+@g;
if (open(INETDCONF,"$inetdcf")) {
@inetd=<INETDCONF>;
close(INETDCONF);
if (grep(m/^$sep$sservice\s+/,@inetd)) {
&enable_service($sservice);
} else {
if (grep(m/^$sservice\s+/,@inetd)) {
if (grep(m/^$sservice\s+/,@inetd) > 1) {
set("update-inetd/ask-several-entries", "true");
fset("update-inetd/ask-several-entries", "seen", "false");
settitle("update-inetd/title");
subst("update-inetd/ask-several-entries", "service", "$sservice");
subst("update-inetd/ask-several-entries", "sservice", "$sservice");
subst("update-inetd/ask-several-entries", "inetdcf", "$inetdcf");
input("high", "update-inetd/ask-several-entries");
@ret = go();
if ($ret[0] == 0) {
@ret = get("update-inetd/ask-several-entries");
exit(1) if ($ret[1] !~ m/true/i);
}
} elsif (!grep(m:^#?.*$searchentry.*:, @inetd)) {
set("update-inetd/ask-entry-present", "true");
fset("update-inetd/ask-entry-present", "seen", "false");
settitle("update-inetd/title");
subst("update-inetd/ask-entry-present", "service", "$sservice");
subst("update-inetd/ask-entry-present", "newentry", "$newentry");
subst("update-inetd/ask-entry-present", "sservice", "$sservice");
subst("update-inetd/ask-entry-present", "inetdcf", "$inetdcf");
my $lookslike = (grep(m/^$sservice\s+/,@inetd))[0];
$lookslike =~ s/\n//g;
subst("update-inetd/ask-entry-present", "lookslike", "$lookslike");
input("high", "update-inetd/ask-entry-present");
@ret = go();
if ($ret[0] == 0) {
@ret = get("update-inetd/ask-entry-present");
exit(1) if ($ret[1] !~ m/true/i);
}
}
} elsif (grep(m/^#\s*$sservice\s+/, @inetd) >= 1 or
(($service =~ s/^#//) and grep(m/^$service\s+/, @inetd)>=1)) {
print STDERR "Processing service \`$service' ... not enabled"
. " (entry is commented out by user)\n";
} else {
&printv("Processing service \`$sservice' ... added\n");
$inetdconf=1;
}
}
if ($inetdconf) {
my $init_svc_count = &scan_entries();
&printv("Number of currently enabled services: $init_svc_count\n");
my ($ICWRITE, $new_inetdcf) = tempfile("/tmp/inetdcfXXXXX", UNLINK => 0);
unless (defined($ICWRITE)) { die "Error creating temporary file: $!\n" }
&printv("Using tempfile $new_inetdcf\n");
open(ICREAD, "$inetdcf");
while(<ICREAD>) {
chomp;
if (/^#:$group:/) {
$found = 1;
};
if ($found and !(/[a-zA-Z#]/)) {
print ($ICWRITE "$newentry\n")
|| die "Error writing to $new_inetdcf: $!\n";
$found = 0;
$success = 1;
}
print $ICWRITE "$_\n";
}
close(ICREAD);
unless ($success) {
print ($ICWRITE "$newentry\n")
|| die "Error writing to $new_inetdcf: $!\n";
$success = 1;
}
close($ICWRITE) || die "Error closing $new_inetdcf: $!\n";
if ($success) {
move("$new_inetdcf","$inetdcf") ||
die "Error installing $new_inetdcf to $inetdcf: $!\n";
chmod(0644, "$inetdcf");
&wakeup_inetd(0,$init_svc_count);
&printv("New service(s) added\n");
} else {
&printv("No service(s) added\n");
unlink("$new_inetdcf")
|| die "Error removing $new_inetdcf: $!\n";
}
} else {
&printv("No service(s) added\n");
}
}
return(1);
}
sub remove_service {
my($service) = @_;
unless(defined($service)) { return(-1) };
chomp($service);
my $nlines_removed = 0;
if($service eq "") {
print STDERR "DebianNet::remove_service called with empty argument\n";
return(-1);
}
if (((&scan_entries("$service") > 1) or (&scan_entries("$sep$service") > 1))
and (not defined($multi))) {
set("update-inetd/ask-remove-entries", "false");
fset("update-inetd/ask-remove-entries", "seen", "false");
settitle("update-inetd/title");
subst("update-inetd/ask-remove-entries", "service", "$service");
subst("update-inetd/ask-remove-entries", "inetdcf", "$inetdcf");
input("high", "update-inetd/ask-remove-entries");
@ret = go();
if ($ret[0] == 0) {
@ret = get("update-inetd/ask-remove-entries");
return(1) if ($ret[1] =~ /false/i);
}
}
my ($ICWRITE, $new_inetdcf) = tempfile("/tmp/inetdcfXXXXX", UNLINK => 0);
unless (defined($ICWRITE)) { die "Error creating temporary file: $!\n" }
&printv("Using tempfile $new_inetdcf\n");
open(ICREAD, "$inetdcf");
RLOOP: while(<ICREAD>) {
chomp;
unless (/^$service\s+/ or /^$sep$service\s+/) {
print $ICWRITE "$_\n";
} else {
&printv("Removing line: \`$_'\n");
$nlines_removed += 1;
}
}
close(ICREAD);
close($ICWRITE);
if ($nlines_removed > 0) {
move("$new_inetdcf", "$inetdcf") ||
die "Error installing $new_inetdcf to $inetdcf: $!\n";
chmod(0644, "$inetdcf");
wakeup_inetd(1);
&printv("Number of service entries removed: $nlines_removed\n");
} else {
&printv("No service entries were removed\n");
unlink("$new_inetdcf") || die "Error removing $new_inetdcf: $!\n";
}
return(1);
}
sub disable_service {
my($service, $pattern) = @_;
unless (defined($service)) { return(-1) };
unless (defined($pattern)) { $pattern = ''; }
chomp($service);
my $nlines_disabled = 0;
if ((&scan_entries("$service", $pattern) > 1) and (not defined($multi))) {
set("update-inetd/ask-disable-entries", "false");
fset("update-inetd/ask-disable-entries", "seen", "false");
settitle("update-inetd/title");
subst("update-inetd/ask-disable-entries", "service", "$service");
subst("update-inetd/ask-disable-entries", "inetdcf", "$inetdcf");
input("high", "update-inetd/ask-disable-entries");
@ret = go();
if ($ret[0] == 0) {
@ret = get("update-inetd/ask-disable-entries");
return(1) if ($ret[1] =~ /false/i);
}
}
my ($ICWRITE, $new_inetdcf) = tempfile("/tmp/inetdcfXXXXX", UNLINK => 0);
unless (defined($ICWRITE)) { die "Error creating temporary file: $!\n" }
&printv("Using tempfile $new_inetdcf\n");
open(ICREAD, "$inetdcf");
DLOOP: while(<ICREAD>) {
chomp;
if (/^$service\s+\w+\s+/ and /$pattern/) {
&printv("Processing service \`$service' ... disabled\n");
$_ =~ s/^(.+)$/$sep$1/;
$nlines_disabled += 1;
}
print $ICWRITE "$_\n";
}
close(ICREAD);
close($ICWRITE) || die "Error closing $new_inetdcf: $!\n";
if ($nlines_disabled > 0) {
move("$new_inetdcf","$inetdcf") ||
die "Error installing new $inetdcf: $!\n";
chmod(0644, "$inetdcf");
wakeup_inetd(1);
&printv("Number of service entries disabled: $nlines_disabled\n");
} else {
&printv("No service entries were disabled\n");
unlink("$new_inetdcf") || die "Error removing $new_inetdcf: $!\n";
}
return(1);
}
sub enable_service {
my($service, $pattern) = @_;
unless (defined($service)) { return(-1) };
unless (defined($pattern)) { $pattern = ''; }
my $init_svc_count = &scan_entries();
my $nlines_enabled = 0;
chomp($service);
my ($ICWRITE, $new_inetdcf) = tempfile("/tmp/inetdXXXXX", UNLINK => 0);
unless (defined($ICWRITE)) { die "Error creating temporary file: $!\n" }
&printv("Using tempfile $new_inetdcf\n");
open(ICREAD, "$inetdcf");
while(<ICREAD>) {
chomp;
if (/^$sep$service\s+\w+\s+/ and /$pattern/) {
&printv("Processing service \`$service' ... enabled\n");
$_ =~ s/^$sep//;
$nlines_enabled += 1;
}
print $ICWRITE "$_\n";
}
close(ICREAD);
close($ICWRITE) || die "Error closing $new_inetdcf: $!\n";
if ($nlines_enabled > 0) {
move("$new_inetdcf","$inetdcf") ||
die "Error installing $new_inetdcf to $inetdcf: $!\n";
chmod(0644, "$inetdcf");
&wakeup_inetd(0,$init_svc_count);
&printv("Number of service entries enabled: $nlines_enabled\n");
} else {
&printv("No service entries were enabled\n");
unlink("$new_inetdcf") || die "Error removing $new_inetdcf: $!\n";
}
return(1);
}
sub wakeup_inetd {
my($removal,$init_svc_count) = @_;
my($pid);
my($action);
$called_wakeup_inetd = 1;
if ($removal) {
$action = 'force-reload';
} elsif ( defined($init_svc_count) and $init_svc_count == 0 ) {
$action = 'start';
} else {
$action = 'restart';
}
$fake_invocation = defined($ENV{"UPDATE_INETD_FAKE_IT"});
if (open(P,"/var/run/inetd.pid")) {
$pid=<P>;
chomp($pid);
if (open(C,sprintf("/proc/%d/stat",$pid))) {
$_=<C>;
if (m/^\d+ \((rl|inetutils-)?inetd\)/) {
&printv("About to send SIGHUP to inetd (pid: $pid)\n");
unless ($fake_invocation) {
kill(1,$pid);
}
} else {
print STDERR "/var/run/inetd.pid does not have a valid pid!";
print STDERR "Please investigate and restart inetd manually.";
}
close(C);
}
close(P);
} else {
$_ = glob "/etc/init.d/*inetd";
if (m/\/etc\/init\.d\/(.*inetd)/ or $fake_invocation) {
&printv("About to $action inetd via invoke-rc.d\n");
my $service = $1;
unless ($fake_invocation) {
# If we were called by a shell script that also uses
# debconf, the pipe to the debconf frontend is fd 3 as
# well as fd 1 (stdout). Ensure that fd 3 is not
# inherited by invoke-rc.d and inetd, as that will
# cause debconf to hang (bug #589487). Don't let them
# confuse debconf via stdout either.
system("invoke-rc.d $service $action >/dev/null 3>&-");
}
}
}
return(1);
}
sub scan_entries {
my ($service, $pattern) = @_;
unless (defined($service)) { $service = '[^#\s]+'; }
unless (defined($pattern)) { $pattern = ''; }
my $counter = 0;
open(ICREAD, "$inetdcf");
SLOOP: while (<ICREAD>) {
$counter++ if (/^$service\s+/ and /$pattern/);
}
close(ICREAD);
return($counter);
}
sub printv {
print STDERR @_ if (defined($verbose));
}
1;