1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
|
#***************************************************************************
# _ _ ____ _
# 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;
|