| #*************************************************************************** |
| # _ _ ____ _ |
| # Project ___| | | | _ \| | |
| # / __| | | | |_) | | |
| # | (__| |_| | _ <| |___ |
| # \___|\___/|_| \_\_____| |
| # |
| # Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al. |
| # |
| # This software is licensed as described in the file COPYING, which |
| # you should have received as part of this distribution. The terms |
| # are also available at https://curl.haxx.se/docs/copyright.html. |
| # |
| # You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| # copies of the Software, and permit persons to whom the Software is |
| # furnished to do so, under the terms of the COPYING file. |
| # |
| # This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| # KIND, either express or implied. |
| # |
| ########################################################################### |
| |
| BEGIN { |
| # portable sleeping needs Time::HiRes |
| eval { |
| no warnings "all"; |
| require Time::HiRes; |
| }; |
| # portable sleeping falls back to native Sleep on Win32 |
| eval { |
| no warnings "all"; |
| require Win32; |
| } |
| } |
| |
| use strict; |
| use warnings; |
| |
| use serverhelp qw( |
| servername_id |
| mainsockf_pidfilename |
| datasockf_pidfilename |
| ); |
| |
| use pathhelp qw( |
| os_is_win |
| ); |
| |
| ####################################################################### |
| # portable_sleep uses Time::HiRes::sleep if available and falls back |
| # to the classic approach of using select(undef, undef, undef, ...). |
| # even though that one is not portable due to being implemented using |
| # select on Windows: https://perldoc.perl.org/perlport.html#select |
| # Therefore it uses Win32::Sleep on Windows systems instead. |
| # |
| sub portable_sleep { |
| my ($seconds) = @_; |
| |
| if($Time::HiRes::VERSION) { |
| Time::HiRes::sleep($seconds); |
| } |
| elsif (os_is_win()) { |
| Win32::Sleep($seconds*1000); |
| } |
| else { |
| select(undef, undef, undef, $seconds); |
| } |
| } |
| |
| ####################################################################### |
| # pidfromfile returns the pid stored in the given pidfile. The value |
| # of the returned pid will never be a negative value. It will be zero |
| # on any file related error or if a pid can not be extracted from the |
| # given file. |
| # |
| sub pidfromfile { |
| my $pidfile = $_[0]; |
| my $pid = 0; |
| |
| if(-f $pidfile && -s $pidfile && open(PIDFH, "<$pidfile")) { |
| $pid = 0 + <PIDFH>; |
| close(PIDFH); |
| $pid = 0 unless($pid > 0); |
| } |
| return $pid; |
| } |
| |
| ####################################################################### |
| # pidexists checks if a process with a given pid exists and is alive. |
| # This will return the positive pid if the process exists and is alive. |
| # This will return the negative pid if the process exists differently. |
| # This will return 0 if the process could not be found. |
| # |
| sub pidexists { |
| my $pid = $_[0]; |
| |
| if($pid > 0) { |
| # verify if currently existing Windows process |
| if ($pid > 65536 && os_is_win()) { |
| $pid -= 65536; |
| if($^O ne 'MSWin32') { |
| my $filter = "PID eq $pid"; |
| my $result = `tasklist -fi \"$filter\" 2>nul`; |
| if(index($result, "$pid") != -1) { |
| return -$pid; |
| } |
| return 0; |
| } |
| } |
| |
| # verify if currently existing and alive |
| if(kill(0, $pid)) { |
| return $pid; |
| } |
| } |
| |
| return 0; |
| } |
| |
| ####################################################################### |
| # pidterm asks the process with a given pid to terminate gracefully. |
| # |
| sub pidterm { |
| my $pid = $_[0]; |
| |
| if($pid > 0) { |
| # request the process to quit |
| if ($pid > 65536 && os_is_win()) { |
| $pid -= 65536; |
| if($^O ne 'MSWin32') { |
| my $filter = "PID eq $pid"; |
| my $result = `tasklist -fi \"$filter\" 2>nul`; |
| if(index($result, "$pid") != -1) { |
| system("taskkill -fi \"$filter\" >nul 2>&1"); |
| } |
| return; |
| } |
| } |
| |
| # signal the process to terminate |
| kill("TERM", $pid); |
| } |
| } |
| |
| ####################################################################### |
| # pidkill kills the process with a given pid mercilessly and forcefully. |
| # |
| sub pidkill { |
| my $pid = $_[0]; |
| |
| if($pid > 0) { |
| # request the process to quit |
| if ($pid > 65536 && os_is_win()) { |
| $pid -= 65536; |
| if($^O ne 'MSWin32') { |
| my $filter = "PID eq $pid"; |
| my $result = `tasklist -fi \"$filter\" 2>nul`; |
| if(index($result, "$pid") != -1) { |
| system("taskkill -f -fi \"$filter\" >nul 2>&1"); |
| # Windows XP Home compatibility |
| system("tskill $pid >nul 2>&1"); |
| } |
| return; |
| } |
| } |
| |
| # signal the process to terminate |
| kill("KILL", $pid); |
| } |
| } |
| |
| ####################################################################### |
| # pidwait waits for the process with a given pid to be terminated. |
| # |
| sub pidwait { |
| my $pid = $_[0]; |
| my $flags = $_[1]; |
| |
| # check if the process exists |
| if ($pid > 65536 && os_is_win()) { |
| if($flags == &WNOHANG) { |
| return pidexists($pid)?0:$pid; |
| } |
| while(pidexists($pid)) { |
| portable_sleep(0.01); |
| } |
| return $pid; |
| } |
| |
| # wait on the process to terminate |
| return waitpid($pid, $flags); |
| } |
| |
| ####################################################################### |
| # processexists checks if a process with the pid stored in the given |
| # pidfile exists and is alive. This will return 0 on any file related |
| # error or if a pid can not be extracted from the given file. When a |
| # process with the same pid as the one extracted from the given file |
| # is currently alive this returns that positive pid. Otherwise, when |
| # the process is not alive, will return the negative value of the pid. |
| # |
| sub processexists { |
| use POSIX ":sys_wait_h"; |
| my $pidfile = $_[0]; |
| |
| # fetch pid from pidfile |
| my $pid = pidfromfile($pidfile); |
| |
| if($pid > 0) { |
| # verify if currently alive |
| if(pidexists($pid)) { |
| return $pid; |
| } |
| else { |
| # get rid of the certainly invalid pidfile |
| unlink($pidfile) if($pid == pidfromfile($pidfile)); |
| # reap its dead children, if not done yet |
| pidwait($pid, &WNOHANG); |
| # negative return value means dead process |
| return -$pid; |
| } |
| } |
| return 0; |
| } |
| |
| ####################################################################### |
| # killpid attempts to gracefully stop processes in the given pid list |
| # with a SIGTERM signal and SIGKILLs those which haven't died on time. |
| # |
| sub killpid { |
| use POSIX ":sys_wait_h"; |
| my ($verbose, $pidlist) = @_; |
| my @requested; |
| my @signalled; |
| my @reapchild; |
| |
| # The 'pidlist' argument is a string of whitespace separated pids. |
| return if(not defined($pidlist)); |
| |
| # Make 'requested' hold the non-duplicate pids from 'pidlist'. |
| @requested = split(' ', $pidlist); |
| return if(not @requested); |
| if(scalar(@requested) > 2) { |
| @requested = sort({$a <=> $b} @requested); |
| } |
| for(my $i = scalar(@requested) - 2; $i >= 0; $i--) { |
| if($requested[$i] == $requested[$i+1]) { |
| splice @requested, $i+1, 1; |
| } |
| } |
| |
| # Send a SIGTERM to processes which are alive to gracefully stop them. |
| foreach my $tmp (@requested) { |
| chomp $tmp; |
| if($tmp =~ /^(\d+)$/) { |
| my $pid = $1; |
| if($pid > 0) { |
| if(pidexists($pid)) { |
| print("RUN: Process with pid $pid signalled to die\n") |
| if($verbose); |
| pidterm($pid); |
| push @signalled, $pid; |
| } |
| else { |
| print("RUN: Process with pid $pid already dead\n") |
| if($verbose); |
| # if possible reap its dead children |
| pidwait($pid, &WNOHANG); |
| push @reapchild, $pid; |
| } |
| } |
| } |
| } |
| |
| # Allow all signalled processes five seconds to gracefully die. |
| if(@signalled) { |
| my $twentieths = 5 * 20; |
| while($twentieths--) { |
| for(my $i = scalar(@signalled) - 1; $i >= 0; $i--) { |
| my $pid = $signalled[$i]; |
| if(!pidexists($pid)) { |
| print("RUN: Process with pid $pid gracefully died\n") |
| if($verbose); |
| splice @signalled, $i, 1; |
| # if possible reap its dead children |
| pidwait($pid, &WNOHANG); |
| push @reapchild, $pid; |
| } |
| } |
| last if(not scalar(@signalled)); |
| portable_sleep(0.05); |
| } |
| } |
| |
| # Mercilessly SIGKILL processes still alive. |
| if(@signalled) { |
| foreach my $pid (@signalled) { |
| if($pid > 0) { |
| print("RUN: Process with pid $pid forced to die with SIGKILL\n") |
| if($verbose); |
| pidkill($pid); |
| # if possible reap its dead children |
| pidwait($pid, &WNOHANG); |
| push @reapchild, $pid; |
| } |
| } |
| } |
| |
| # Reap processes dead children for sure. |
| if(@reapchild) { |
| foreach my $pid (@reapchild) { |
| if($pid > 0) { |
| pidwait($pid, 0); |
| } |
| } |
| } |
| } |
| |
| ####################################################################### |
| # killsockfilters kills sockfilter processes for a given server. |
| # |
| sub killsockfilters { |
| my ($proto, $ipvnum, $idnum, $verbose, $which) = @_; |
| my $server; |
| my $pidfile; |
| my $pid; |
| |
| return if($proto !~ /^(ftp|imap|pop3|smtp)$/); |
| |
| die "unsupported sockfilter: $which" |
| if($which && ($which !~ /^(main|data)$/)); |
| |
| $server = servername_id($proto, $ipvnum, $idnum) if($verbose); |
| |
| if(!$which || ($which eq 'main')) { |
| $pidfile = mainsockf_pidfilename($proto, $ipvnum, $idnum); |
| $pid = processexists($pidfile); |
| if($pid > 0) { |
| printf("* kill pid for %s-%s => %d\n", $server, |
| ($proto eq 'ftp')?'ctrl':'filt', $pid) if($verbose); |
| pidkill($pid); |
| pidwait($pid, 0); |
| } |
| unlink($pidfile) if(-f $pidfile); |
| } |
| |
| return if($proto ne 'ftp'); |
| |
| if(!$which || ($which eq 'data')) { |
| $pidfile = datasockf_pidfilename($proto, $ipvnum, $idnum); |
| $pid = processexists($pidfile); |
| if($pid > 0) { |
| printf("* kill pid for %s-data => %d\n", $server, |
| $pid) if($verbose); |
| pidkill($pid); |
| pidwait($pid, 0); |
| } |
| unlink($pidfile) if(-f $pidfile); |
| } |
| } |
| |
| ####################################################################### |
| # killallsockfilters kills sockfilter processes for all servers. |
| # |
| sub killallsockfilters { |
| my $verbose = $_[0]; |
| |
| for my $proto (('ftp', 'imap', 'pop3', 'smtp')) { |
| for my $ipvnum (('4', '6')) { |
| for my $idnum (('1', '2')) { |
| killsockfilters($proto, $ipvnum, $idnum, $verbose); |
| } |
| } |
| } |
| } |
| |
| |
| sub set_advisor_read_lock { |
| my ($filename) = @_; |
| |
| if(open(FILEH, ">$filename")) { |
| close(FILEH); |
| return; |
| } |
| printf "Error creating lock file $filename error: $!"; |
| } |
| |
| |
| sub clear_advisor_read_lock { |
| my ($filename) = @_; |
| |
| if(-f $filename) { |
| unlink($filename); |
| } |
| } |
| |
| |
| 1; |
