To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 537
- compare with another revision
- download diff
- download tarball
- view history from revision 537
- Committer: Björn Påhlsson
- Date: 2011-12-26 15:23:45 UTC
- Revision ID: belorn@recompile.se-20111226152345-cd9mz98e7eiqbfbx
nicer stacktrace when mandos-monitor fail during startup
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
22
* Contact the authors at <mandos@recompile.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
28
27
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
32
31
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
71
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
73
#include <errno.h> /* errno */
73
74
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
75
76
76
#define BUFFER_SIZE 256
77
77
78
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
80
82
81
const char *argp_program_version = "plugin-runner " VERSION;
106
105
107
106
/* Gets an existing plugin based on name,
108
107
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
108
static plugin *getplugin(char *name){
111
109
/* Check for existing plugin with that name */
112
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
171
}
174
172
175
173
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
174
__attribute__((nonnull))
177
175
static bool add_to_char_array(const char *new, char ***array,
178
176
int *len){
179
177
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
178
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
196
182
/* Malloc check */
197
if(new_array == NULL){
183
if(*array == NULL){
198
184
return false;
199
185
}
200
*array = new_array;
201
186
/* Make a copy of the new string */
202
187
char *copy;
203
188
do {
215
200
}
216
201
217
202
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
203
__attribute__((nonnull(2)))
219
204
static bool add_argument(plugin *p, const char *arg){
220
205
if(p == NULL){
221
206
return false;
224
209
}
225
210
226
211
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
212
__attribute__((nonnull(2)))
228
213
static bool add_environment(plugin *p, const char *def, bool replace){
229
214
if(p == NULL){
230
215
return false;
232
217
/* namelen = length of name of environment variable */
233
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
219
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
237
222
/* It already exists */
238
223
if(replace){
239
char *new_envdef;
224
char *new;
240
225
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
244
229
return false;
245
230
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
231
*e = new;
232
strcpy(*e, def);
248
233
}
249
234
return true;
250
235
}
252
237
return add_to_char_array(def, &(p->environ), &(p->envc));
253
238
}
254
239
255
#ifndef O_CLOEXEC
256
240
/*
257
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
242
* Descriptor Flags".
259
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
260
244
*/
261
__attribute__((warn_unused_result))
262
245
static int set_cloexec_flag(int fd){
263
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
264
247
/* If reading the flags failed, return error indication now. */
269
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
253
ret | FD_CLOEXEC));
271
254
}
272
#endif /* not O_CLOEXEC */
273
255
274
256
275
257
/* Mark processes as completed when they exit, and save their exit
307
289
}
308
290
309
291
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
292
__attribute__((nonnull))
311
293
static bool print_out_password(const char *buffer, size_t length){
312
294
ssize_t ret;
313
295
for(size_t written = 0; written < length; written += (size_t)ret){
324
306
__attribute__((nonnull))
325
307
static void free_plugin(plugin *plugin_node){
326
308
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
310
free(*arg);
329
311
}
330
free(plugin_node->name);
331
312
free(plugin_node->argv);
332
313
for(char **env = plugin_node->environ; *env != NULL; env++){
333
314
free(*env);
360
341
361
342
int main(int argc, char *argv[]){
362
343
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
344
char *argfile = NULL;
365
345
FILE *conffp;
366
struct dirent **direntries = NULL;
346
size_t d_name_len;
347
DIR *dir = NULL;
348
struct dirent *dirst;
367
349
struct stat st;
368
350
fd_set rfds_all;
369
351
int ret, maxfd = 0;
377
359
.sa_flags = SA_NOCLDSTOP };
378
360
char **custom_argv = NULL;
379
361
int custom_argc = 0;
380
int dir_fd = -1;
381
362
382
363
/* Establish a signal handler */
383
364
sigemptyset(&sigchld_action.sa_mask);
428
409
.doc = "Group ID the plugins will run as", .group = 3 },
429
410
{ .name = "debug", .key = 132,
430
411
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
412
/*
436
413
* These reproduce what we would get without ARGP_NO_HELP
437
414
*/
458
435
break;
459
436
}
460
437
}
461
errno = 0;
462
438
}
463
439
break;
464
440
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
441
add_environment(getplugin(NULL), arg, true);
468
442
break;
469
443
case 'o': /* --options-for */
470
444
{
487
461
break;
488
462
}
489
463
}
490
errno = 0;
491
464
}
492
465
break;
493
466
case 'E': /* --env-for */
505
478
errno = EINVAL;
506
479
break;
507
480
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
481
add_environment(getplugin(arg), envdef, true);
511
482
}
512
483
break;
513
484
case 'd': /* --disable */
515
486
plugin *p = getplugin(arg);
516
487
if(p != NULL){
517
488
p->disabled = true;
518
errno = 0;
519
489
}
520
490
}
521
491
break;
524
494
plugin *p = getplugin(arg);
525
495
if(p != NULL){
526
496
p->disabled = false;
527
errno = 0;
528
497
}
529
498
}
530
499
break;
531
500
case 128: /* --plugin-dir */
532
501
free(plugindir);
533
502
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
503
break;
538
504
case 129: /* --config-file */
539
505
/* This is already done by parse_opt_config_file() */
547
513
break;
548
514
}
549
515
uid = (uid_t)tmp_id;
550
errno = 0;
551
516
break;
552
517
case 131: /* --groupid */
553
518
tmp_id = strtoimax(arg, &tmp, 10);
558
523
break;
559
524
}
560
525
gid = (gid_t)tmp_id;
561
errno = 0;
562
526
break;
563
527
case 132: /* --debug */
564
528
debug = true;
565
529
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
530
/*
574
531
* These reproduce what we would get without ARGP_NO_HELP
575
532
*/
576
533
case '?': /* --help */
577
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
536
case -3: /* --usage */
581
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
538
argp_state_help(state, state->out_stream,
583
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
540
case 'V': /* --version */
586
541
fprintf(state->out_stream, "%s\n", argp_program_version);
587
542
exit(EXIT_SUCCESS);
597
552
if(arg[0] == '\0'){
598
553
break;
599
554
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
555
default:
606
556
return ARGP_ERR_UNKNOWN;
607
557
}
626
576
case 129: /* --config-file */
627
577
free(argfile);
628
578
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
579
break;
633
580
case 130: /* --userid */
634
581
case 131: /* --groupid */
635
582
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
583
case '?': /* --help */
638
584
case -3: /* --usage */
639
585
case 'V': /* --version */
718
664
}
719
665
720
666
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
672
free(org_line);
673
goto fallback;
744
674
}
745
675
custom_argv[custom_argc-1] = new_arg;
746
676
custom_argv[custom_argc] = NULL;
804
734
goto fallback;
805
735
}
806
736
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
823
}
824
825
737
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
740
p->name ? p->name : "Global", p->argc - 1);
829
741
for(char **a = p->argv; *a != NULL; a++){
838
750
839
751
if(getuid() == 0){
840
752
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
753
<http://bugs.debian.org/633582> */
842
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
755
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
756
error(0, errno, "open");
847
757
} else {
848
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
759
if(ret == -1){
856
766
}
857
767
}
858
768
}
859
close(plugindir_fd);
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
860
770
}
861
771
}
862
772
863
773
/* Lower permissions */
864
ret = setgid(gid);
774
setgid(gid);
865
775
if(ret == -1){
866
776
error(0, errno, "setgid");
867
777
}
872
782
873
783
/* Open plugin directory with close_on_exec flag */
874
784
{
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
882
803
if(dir_fd == -1){
883
804
error(0, errno, "Could not open plugin dir");
884
805
exitstatus = EX_UNAVAILABLE;
890
811
ret = set_cloexec_flag(dir_fd);
891
812
if(ret < 0){
892
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
893
815
exitstatus = EX_OSERR;
894
816
goto fallback;
895
817
}
896
818
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
919
}
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
920
826
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
931
827
}
932
828
933
829
FD_ZERO(&rfds_all);
934
830
935
831
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
832
while(true){
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
836
837
/* All directory entries have been processed */
838
if(dirst == NULL){
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
842
goto fallback;
843
}
844
break;
845
}
846
847
d_name_len = strlen(dirst->d_name);
848
849
/* Ignore dotfiles, backup files and other junk */
850
{
851
bool bad_name = false;
852
853
const char const *bad_prefixes[] = { ".", "#", NULL };
854
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
856
".dpkg-old",
857
".dpkg-bak",
858
".dpkg-divert", NULL };
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
860
size_t pre_len = strlen(*pre);
861
if((d_name_len >= pre_len)
862
and strncmp((dirst->d_name), *pre, pre_len) == 0){
863
if(debug){
864
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
865
" with bad prefix %s\n", dirst->d_name, *pre);
866
}
867
bad_name = true;
868
break;
869
}
870
}
871
if(bad_name){
872
continue;
873
}
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
875
size_t suf_len = strlen(*suf);
876
if((d_name_len >= suf_len)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
878
== 0)){
879
if(debug){
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
881
" with bad suffix %s\n", dirst->d_name, *suf);
882
}
883
bad_name = true;
884
break;
885
}
886
}
887
888
if(bad_name){
889
continue;
890
}
891
}
892
893
char *filename;
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
902
if(ret < 0){
903
error(0, errno, "asprintf");
942
904
continue;
943
905
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
906
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
945
908
if(ret == -1){
946
909
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
910
free(filename);
949
911
continue;
950
912
}
951
913
952
914
/* Ignore non-executable files */
953
915
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
956
917
if(debug){
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
" with bad type or mode\n", filename);
961
920
}
962
close(plugin_fd);
963
free(direntries[i]);
921
free(filename);
964
922
continue;
965
923
}
966
924
967
plugin *p = getplugin(direntries[i]->d_name);
925
plugin *p = getplugin(dirst->d_name);
968
926
if(p == NULL){
969
927
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
928
free(filename);
972
929
continue;
973
930
}
974
931
if(p->disabled){
975
932
if(debug){
976
933
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
934
dirst->d_name);
978
935
}
979
close(plugin_fd);
980
free(direntries[i]);
936
free(filename);
981
937
continue;
982
938
}
983
939
{
997
953
}
998
954
}
999
955
}
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
958
process, too. */
1002
959
if(p->environ[0] != NULL){
1003
960
for(char **e = environ; *e != NULL; e++){
1004
961
if(not add_environment(p, *e, false)){
1008
965
}
1009
966
1010
967
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
969
if(ret == -1){
1017
970
error(0, errno, "pipe");
1018
971
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
972
goto fallback;
973
}
1032
974
/* Ask OS to automatic close the pipe on exec */
1033
975
ret = set_cloexec_flag(pipefd[0]);
1034
976
if(ret < 0){
1035
977
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
978
exitstatus = EX_OSERR;
1039
free(direntries[i]);
1040
979
goto fallback;
1041
980
}
1042
981
ret = set_cloexec_flag(pipefd[1]);
1043
982
if(ret < 0){
1044
983
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
984
exitstatus = EX_OSERR;
1048
free(direntries[i]);
1049
985
goto fallback;
1050
986
}
1051
#endif /* not O_CLOEXEC */
1052
987
/* Block SIGCHLD until process is safely in process list */
1053
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
989
&sigchld_action.sa_mask,
1056
991
if(ret < 0){
1057
992
error(0, errno, "sigprocmask");
1058
993
exitstatus = EX_OSERR;
1059
free(direntries[i]);
1060
994
goto fallback;
1061
995
}
1062
996
/* Starting a new process to be watched */
1066
1000
} while(pid == -1 and errno == EINTR);
1067
1001
if(pid == -1){
1068
1002
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
1003
exitstatus = EX_OSERR;
1074
free(direntries[i]);
1075
1004
goto fallback;
1076
1005
}
1077
1006
if(pid == 0){
1093
1022
_exit(EX_OSERR);
1094
1023
}
1095
1024
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
1025
if(dirfd(dir) < 0){
1026
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1027
above and must now close it manually here. */
1028
closedir(dir);
1029
}
1030
if(p->environ[0] == NULL){
1031
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
1034
}
1035
} else {
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
1039
}
1102
1040
}
1103
1041
/* no return */
1104
1042
}
1105
1043
/* Parent process */
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
free(filename);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1109
1048
if(new_plugin == NULL){
1110
1049
error(0, errno, "getplugin");
1111
1050
ret = (int)(TEMP_FAILURE_RETRY
1115
1054
error(0, errno, "sigprocmask");
1116
1055
}
1117
1056
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1119
1057
goto fallback;
1120
1058
}
1121
free(direntries[i]);
1122
1059
1123
1060
new_plugin->pid = pid;
1124
1061
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
1062
1131
1063
/* Unblock SIGCHLD so signal handler can be run if this process
1132
1064
has already completed */
1133
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1139
1071
goto fallback;
1140
1072
}
1141
1073
1142
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
1143
1076
1144
1077
if(maxfd < new_plugin->fd){
1145
1078
maxfd = new_plugin->fd;
1146
1079
}
1147
1080
}
1148
1081
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1082
TEMP_FAILURE_RETRY(closedir(dir));
1083
dir = NULL;
1153
1084
free_plugin(getplugin(NULL));
1154
1085
1155
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1194
1125
(intmax_t) (proc->pid),
1195
1126
WTERMSIG(proc->status),
1196
1127
strsignal(WTERMSIG(proc->status)));
1128
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
1197
1131
}
1198
1132
}
1199
1133
1200
1134
/* Remove the plugin */
1201
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1202
1137
1203
1138
/* Block signal while modifying process_list */
1204
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1244
1179
}
1245
1180
1246
1181
/* This process has not completed. Does it have any output? */
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
1248
1185
/* This process had nothing to say at this time */
1249
1186
proc = proc->next;
1250
1187
continue;
1251
1188
}
1252
1189
/* Before reading, make the process' data buffer large enough */
1253
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1257
1194
error(0, errno, "malloc");
1258
1195
exitstatus = EX_OSERR;
1259
1196
goto fallback;
1260
1197
}
1261
proc->buffer = new_buffer;
1262
1198
proc->buffer_size += BUFFER_SIZE;
1263
1199
}
1264
1200
/* Read from the process */
1317
1253
free(custom_argv);
1318
1254
}
1319
1255
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1256
if(dir != NULL){
1257
closedir(dir);
1324
1258
}
1325
1259
1326
1260
/* Kill the processes */
1346
1280
free_plugin_list();
1347
1281
1348
1282
free(plugindir);
1349
free(pluginhelperdir);
1350
1283
free(argfile);
1351
1284
1352
1285
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0