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# proc-lib.pl
# Functions for managing processes
BEGIN { push(@INC, ".."); };
use WebminCore;
use POSIX;
use Config;
&init_config();
if ($module_info{'usermin'} && !$ENV{'FOREIGN_MODULE_NAME'}) {
&switch_to_remote_user();
}
do "$config{ps_style}-lib.pl";
if ($module_info{'usermin'}) {
%access = ( 'edit' => 1,
'run' => 1,
'users' => 'x' );
$no_module_config = 1;
$user_processes_only = 1;
$index_file = "$user_module_config_directory/index";
}
else {
%access = &get_module_acl();
map { $hide{$_}++ } split(/\s+/, $access{'hide'});
$index_file = "$module_config_directory/index";
$user_processes_only = $access{'only'};
if (!defined($access{'users'})) {
$access{'users'} = $access{'uid'} < 0 ? "x" :
$access{'uid'} == 0 ? "*" :
getpwuid($access{'uid'});
}
}
if ($access{'run'}) {
if ($access{'users'} eq "*") {
$default_run_user = "root";
}
elsif (&can_edit_process($remote_user)) {
$default_run_user = $remote_user;
}
else {
local @canu = split(/\s+/, $access{'users'});
if ($canu[0] =~ /^\@(.*)$/) {
$default_run_user = undef;
}
elsif ($can[0] =~ /^(\d+)\-(\d+)$/) {
$default_run_user = getpwuid($1);
}
else {
$default_run_user = $canu[0];
}
}
}
sub process_info
{
local @plist = &list_processes($_[0]);
return @plist ? %{$plist[0]} : ();
}
# index_links(current)
sub index_links
{
local(%linkname, $l);
print "<b>$text{'index_display'} : </b>\n";
local @links;
foreach $l ("tree", "user", "size", "cpu", ($has_zone ? ("zone") : ()),
"search", "run") {
next if ($l eq "run" && !$access{'run'});
local $link;
if ($l ne $_[0]) { $link .= "<a href=index_$l.cgi>"; }
else { $link .= "<b>"; }
$link .= $text{"index_$l"};
if ($l ne $_[0]) { $link .= "</a>"; }
else { $link .= "</b>"; }
push(@links, $link);
}
print &ui_links_row(\@links);
print "<p>\n";
&create_user_config_dirs();
open(INDEX, ">$index_file");
$0 =~ /([^\/]+)$/;
print INDEX "$1?$in\n";
close(INDEX);
}
# cut_string(string, [length])
sub cut_string
{
local $len = $_[1] || $config{'cut_length'};
if ($len && length($_[0]) > $len) {
return substr($_[0], 0, $len)." ...";
}
return $_[0];
}
# switch_acl_uid()
sub switch_acl_uid
{
return if ($module_info{'usermin'}); # already switched!
if ($access{'uid'} < 0) {
local @u = getpwnam($remote_user);
@u || &error("Failed to find user $remote_user");
&switch_to_unix_user(\@u);
}
elsif ($access{'uid'}) {
local @u = getpwuid($access{'uid'});
&switch_to_unix_user(\@u);
}
}
# safe_process_exec(command, uid, gid, handle, [input], [fixtags], [bsmode],
# [timeout], [safe])
# Executes the given command as the given user/group and writes all output
# to the given file handle. Finishes when there is no more output or the
# process stops running. Returns the number of bytes read.
sub safe_process_exec
{
if (&is_readonly_mode() && !$_[8]) {
# Veto command in readonly mode
return 0;
}
&webmin_debug_log('CMD', "cmd=$_[0] uid=$_[1] gid=$_[2]")
if ($gconfig{'debug_what_cmd'});
if ($gconfig{'os_type'} eq 'windows') {
# For Windows, just run the command and read output
local $temp = &transname();
open(TEMP, ">$temp");
print TEMP $_[4];
close(TEMP);
&open_execute_command(OUT, "$_[0] <$temp 2>&1", 1);
local $fh = $_[3];
while(<OUT>) {
if ($_[5]) {
print $fh &html_escape($_);
}
else {
print $fh $_;
}
}
close(OUT);
return $got;
}
else {
# setup pipes and fork the process
local $chld = $SIG{'CHLD'};
$SIG{'CHLD'} = \&safe_exec_reaper;
pipe(OUTr, OUTw);
pipe(INr, INw);
local $pid = fork();
if (!$pid) {
#setsid();
untie(*STDIN);
untie(*STDOUT);
untie(*STDERR);
open(STDIN, "<&INr");
open(STDOUT, ">&OUTw");
open(STDERR, ">&OUTw");
$| = 1;
close(OUTr); close(INw);
if ($_[1]) {
if (defined($_[2])) {
# switch to given UID and GID
&switch_to_unix_user(
[ undef, undef, $_[1], $_[2] ]);
}
else {
# switch to UID and all GIDs
local @u = getpwuid($_[1]);
&switch_to_unix_user(\@u);
}
}
# run the command
delete($ENV{'FOREIGN_MODULE_NAME'});
delete($ENV{'SCRIPT_NAME'});
exec("/bin/sh", "-c", $_[0]);
print "Exec failed : $!\n";
exit 1;
}
close(OUTw); close(INr);
# Feed input (if any)
print INw $_[4];
close(INw);
# Read and show output
local $fn = fileno(OUTr);
local $got = 0;
local $out = $_[3];
local $line;
local $start = time();
$safe_process_exec_timeout = 0;
while(1) {
local ($rmask, $buf);
vec($rmask, $fn, 1) = 1;
local $sel = select($rmask, undef, undef, 1);
if ($sel > 0 && vec($rmask, $fn, 1)) {
# got something to read.. print it
sysread(OUTr, $buf, 1024) || last;
$got += length($buf);
if ($_[5]) {
$buf = &html_escape($buf);
}
if ($_[6]) {
# Convert backspaces and returns and escapes
$line .= $buf;
while($line =~ s/^([^\n]*\n)//) {
local $one = $1;
while($one =~ s/.\010//) { }
$one =~ s/\033[^m]+m//g;
print $out $one;
}
}
else {
print $out $buf;
}
}
elsif ($sel == 0) {
# nothing to read. maybe the process is done, and a
# subprocess is hanging things up
last if (!kill(0, $pid));
}
if ($_[7] && time() - $start > $_[7]) {
# Timeout exceeded - kill the process
kill(KILL, $pid);
$safe_process_exec_timeout = 1;
}
}
close(OUTr);
print $out $line;
$SIG{'CHLD'} = $chld;
return $got;
}
}
# safe_process_exec_logged(..)
# Like safe_process_exec, but also logs the command
sub safe_process_exec_logged
{
&additional_log('exec', undef, $_[0]);
return &safe_process_exec(@_);
}
sub safe_exec_reaper
{
local $xp;
do { local $oldexit = $?;
$xp = waitpid(-1, WNOHANG);
$? = $oldexit if ($? < 0);
} while($xp > 0);
}
# pty_process_exec(command, [uid, gid])
# Starts the given command in a new pty and returns the pty filehandle and PID
sub pty_process_exec
{
local ($cmd, $uid, $gid) = @_;
if (&is_readonly_mode()) {
# When in readonly mode, don't run the command
$cmd = "/bin/true";
}
&webmin_debug_log('CMD', "cmd=$cmd uid=$uid gid=$gid")
if ($gconfig{'debug_what_cmd'});
eval "use IO::Pty";
if (!$@) {
# Use the IO::Pty perl module if installed
local $ptyfh = new IO::Pty;
if (!$ptyfh) {
&error("Failed to create new PTY with IO::Pty");
}
local $pid = fork();
if (!$pid) {
local $ttyfh = $ptyfh->slave();
local $tty = $ptyfh->ttyname();
if (defined(&close_controlling_pty)) {
&close_controlling_pty();
}
setsid(); # create a new session group
$ptyfh->make_slave_controlling_terminal();
# Turn off echoing, if we can
eval "use IO::Stty";
if (!$@) {
IO::Stty::stty($ttyfh, 'raw', '-echo');
}
close(STDIN); close(STDOUT); close(STDERR);
untie(*STDIN); untie(*STDOUT); untie(*STDERR);
if ($_[1]) {
&switch_to_unix_user([ undef, undef, $_[1], $_[2] ]);
}
close($ptyfh); # Used by other side only
open(STDIN, "<&".fileno($ttyfh));
open(STDOUT, ">&".fileno($ttyfh));
open(STDERR, ">&".fileno($ttyfh));
close($ttyfh); # Already dup'd
exec($cmd);
print "Exec failed : $!\n";
exit 1;
}
$ptyfh->close_slave();
return ($ptyfh, $pid);
}
else {
# Need to create a PTY using built-in Webmin code
local ($ptyfh, $ttyfh, $pty, $tty) = &get_new_pty();
$tty || &error("Failed to create new PTY - try installing the IO::Tty Perl module");
local $pid = fork();
if (!$pid) {
if (defined(&close_controlling_pty)) {
&close_controlling_pty();
}
setsid(); # create a new session group
if (!$ttyfh) {
# Needs to be opened, as get_new_pty on linux cannot do
# this so soon
$ttyfh = "TTY";
if ($_[1]) {
chown($_[1], $_[2], $tty);
}
open($ttyfh, "+<$tty") || &error("Failed to open $tty : $!");
}
# Turn off echoing, if we can
eval "use IO::Stty";
if (!$@) {
IO::Stty::stty($ttyfh, 'raw', '-echo');
}
if (defined(&open_controlling_pty)) {
&open_controlling_pty($ptyfh, $ttyfh, $pty, $tty);
}
close(STDIN); close(STDOUT); close(STDERR);
untie(*STDIN); untie(*STDOUT); untie(*STDERR);
#setpgrp(0, $$);
if ($_[1]) {
&switch_to_unix_user([ undef, undef, $_[1], $_[2] ]);
}
open(STDIN, "<$tty");
open(STDOUT, ">&$ttyfh");
open(STDERR, ">&STDOUT");
close($ptyfh);
exec($cmd);
print "Exec failed : $!\n";
exit 1;
}
close($ttyfh);
return ($ptyfh, $pid);
}
}
# pty_process_exec_logged(..)
# Like pty_process_exec, but logs the command as well
sub pty_process_exec_logged
{
&additional_log('exec', undef, $_[0]);
return &pty_process_exec(@_);
}
# find_process(name)
# Returns an array of all processes matching some name
sub find_process
{
local $name = $_[0];
local @rv = grep { $_->{'args'} =~ /$name/ } &list_processes();
return wantarray ? @rv : $rv[0];
}
$has_lsof_command = &has_command("lsof");
# find_socket_processes(protocol, port)
# Returns all processes using some port and protocol
sub find_socket_processes
{
local @rv;
open(LSOF, "lsof -i '$_[0]:$_[1]' |");
while(<LSOF>) {
if (/^(\S+)\s+(\d+)/) {
push(@rv, $2);
}
}
close(LSOF);
return @rv;
}
# find_ip_processes(ip)
# Returns all processes using some IP address
sub find_ip_processes
{
local @rv;
open(LSOF, "lsof -i '\@$_[0]' |");
while(<LSOF>) {
if (/^(\S+)\s+(\d+)/) {
push(@rv, $2);
}
}
close(LSOF);
return @rv;
}
# find_process_sockets(pid)
# Returns all network connections made by some process
sub find_process_sockets
{
local @rv;
open(LSOF, "lsof -i tcp -i udp -n |");
while(<LSOF>) {
if (/^(\S+)\s+(\d+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+).*(TCP|UDP)\s+(.*)/
&& $2 eq $_[0]) {
local $n = { 'fd' => $4,
'type' => $5,
'proto' => $7 };
local $m = $8;
if ($m =~ /^([^:\s]+):([^:\s]+)\s+\(listen\)/i) {
$n->{'lhost'} = $1;
$n->{'lport'} = $2;
$n->{'listen'} = 1;
}
elsif ($m =~ /^([^:\s]+):([^:\s]+)->([^:\s]+):([^:\s]+)\s+\((\S+)\)/) {
$n->{'lhost'} = $1;
$n->{'lport'} = $2;
$n->{'rhost'} = $3;
$n->{'rport'} = $4;
$n->{'state'} = $5;
}
elsif ($m =~ /^([^:\s]+):([^:\s]+)/) {
$n->{'lhost'} = $1;
$n->{'lport'} = $2;
}
push(@rv, $n);
}
}
close(LSOF);
return @rv;
}
# find_process_files(pid)
# Returns all files currently held open by some process
sub find_process_files
{
local @rv;
open(LSOF, "lsof -p '$_[0]' |");
while(<LSOF>) {
if (/^(\S+)\s+(\d+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\d+),(\d+)\s+(\d+)\s+(\d+)\s+(.*)/) {
push(@rv, { 'fd' => lc($4),
'type' => lc($5),
'device' => [ $6, $7 ],
'size' => $8,
'inode' => $9,
'file' => $10 });
}
elsif (/^(\S+)\s+(\d+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\d+),(\d+)\s+(\d+)\s+(.*)/) {
push(@rv, { 'fd' => lc($4),
'type' => lc($5),
'device' => [ $6, $7 ],
'inode' => $8,
'file' => $9 });
}
}
close(LSOF);
return @rv;
}
# pty_backquote(cmd, uid, gid)
# Like the normal Perl backquote operator, but executes the command in a PTY
sub pty_backquote
{
local $rv;
local ($fh, $pid) = &pty_process_exec(@_);
while(<$fh>) {
$rv .= $_;
}
close($fh);
waitpid($pid, WNOHANG);
return $rv;
}
# pty_backquote_logged(cmd, uid, gid)
# Like pty_backquote, but logs the command as well
sub pty_backquote_logged
{
&additional_log('exec', undef, $_[0]);
return &pty_backquote(@_);
}
# get_cpu_info()
# Returns a list containing the 5, 10 and 15 minute load averages, and possibly
# the CPU mhz, model, vendor, cache and count
sub get_cpu_info
{
if (defined(&os_get_cpu_info)) {
return &os_get_cpu_info();
}
&clean_language();
local $out = &backquote_command("uptime 2>&1");
&reset_environment();
return $out =~ /average(s)?:\s+([0-9\.]+),?\s+([0-9\.]+),?\s+([0-9\.]+)/i ?
( $2, $3, $4 ) : ( );
}
# find_subprocesses(&proc, [&plist])
# Returns a list of all processes under the one given
sub find_subprocesses
{
local $proc = $_[0];
local @plist = $_[1] ? @{$_[1]} : &list_processes();
local @sp = grep { $_->{'ppid'} &&
$_->{'ppid'} == $proc->{'pid'} } @plist;
local (@rv, $sp);
foreach $sp (@sp) {
push(@rv, $sp, &find_subprocesses($sp, \@plist));
}
return @rv;
}
# supported_signals()
# Returns signal names known to Perl for the kill function
sub supported_signals
{
if (defined(&os_supported_signals)) {
return &os_supported_signals();
}
else {
return split(/\s+/, $Config{'sig_name'});
}
}
# can_view_process(user)
# Returns 1 if processes belong to this user can be seen
sub can_view_process
{
local ($user) = @_;
if ($hide{$user}) {
return 0;
}
elsif ($user_processes_only) {
return &can_edit_process($user);
}
else {
return 1;
}
}
# can_edit_process(user)
# Returns 1 if processes belong to this user can be edited. The 'manage as'
# user will still apply though.
sub can_edit_process
{
local ($user) = @_;
if (!$access{'edit'}) {
return 0;
}
elsif ($hide{$user}) {
return 0;
}
elsif ($access{'users'} eq '*') {
return 1;
}
elsif ($access{'users'} eq 'x') {
return $user eq $remote_user;
}
else {
local @uinfo = getpwnam($user);
foreach my $u (split(/\s+/, $access{'users'})) {
if ($u =~ /^\@(.*)$/) {
# Is he in this group?
local @ginfo = getgrnam($1);
return 1 if ($uinfo[3] == $ginfo[2]);
return 1 if (&indexof($ginfo[0],
&other_groups($user)) >= 0);
}
elsif ($u =~ /^(\d+)\-(\d+)$/) {
# Check UID
return 1 if ($uinfo[2] >= $1 && $uinfo[2] <= $2);
}
else {
return 1 if ($u eq $user);
}
}
return 0;
}
}
# nice_selector(name, value)
# Returns a menu for selecting a nice level
sub nice_selector
{
local ($name, $value) = @_;
local $l = scalar(@nice_range);
return &ui_select($name, $value,
[ map { [ $_, $_.($_ == $nice_range[0] ? " ($text{'edit_prihigh'})" :
$_ == 0 ? " ($text{'edit_pridef'})" :
$_ == $nice_range[$l-1] ? " ($text{'edit_prilow'})" :
"") ] } @nice_range ]);
}
# get_kernel_info()
# Returns the system's kernel version, architecture and OS
sub get_kernel_info
{
if (defined(&os_get_kernel_info)) {
return &os_get_kernel_info();
}
else {
my $uname = &has_command("uptrack-uname") || &has_command("uname");
my $out = &backquote_command("$uname -r 2>/dev/null ; ".
"$uname -m 2>/dev/null ; ".
"$uname -s 2>/dev/null");
return split(/\r?\n/, $out);
}
}
# get_system_uptime()
# Returns uptime in days, minutes and hours
sub get_system_uptime
{
my $out = &backquote_command("LC_ALL='' LANG='' uptime");
if ($out =~ /up\s+(\d+)\s+(day|days),?\s+(\d+):(\d+)/) {
# up 198 days, 2:06
return ( $1, $3, $4 );
}
elsif ($out =~ /up\s+(\d+)\s+(day|days),?\s+(\d+)\s+min/) {
# up 198 days, 10 mins
return ( $1, 0, $3 );
}
elsif ($out =~ /up\s+(\d+):(\d+)/) {
# up 3:10
return ( 0, $1, $2 );
}
elsif ($out =~ /up\s+(\d+)\s+min/) {
# up 45 mins
return ( 0, 0, $1 );
}
else {
return ( );
}
}
1;
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