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 1230
- compare with another revision
- download diff
- download tarball
- view history from revision 1230
- Committer: Teddy Hogeborn
- Date: 2020-12-06 12:02:04 UTC
- Revision ID: teddy@recompile.se-20201206120204-pkx839mdn2x2v2m7
Minor code cleanup
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Replace a free()/malloc()
pair with single realloc() call.
* dracut-module/password-agent.c
(test_send_password_to_socket_EMSGSIZE): Replace a free()/malloc()
pair with single realloc() call.
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
O_CLOEXEC, pipe2() */
27
28
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
30
31
#include <stdbool.h> /* bool, true, false */
31
32
#include <stdio.h> /* fileno(), fprintf(),
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() */
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() */
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
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
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() */
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
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
72
#include <errno.h> /* errno */
74
73
#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"
79
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
81
82
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
83
84
84
85
typedef struct plugin{
85
86
char *name; /* can be NULL or any plugin name */
105
106
106
107
/* Gets an existing plugin based on name,
107
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
108
110
static plugin *getplugin(char *name){
109
111
/* Check for existing plugin with that name */
110
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
173
}
172
174
173
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
174
177
static bool add_to_char_array(const char *new, char ***array,
175
178
int *len){
176
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
177
181
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
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);
181
196
/* Malloc check */
182
if(*array == NULL){
197
if(new_array == NULL){
183
198
return false;
184
199
}
200
*array = new_array;
185
201
/* Make a copy of the new string */
186
202
char *copy;
187
203
do {
199
215
}
200
216
201
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
202
219
static bool add_argument(plugin *p, const char *arg){
203
220
if(p == NULL){
204
221
return false;
207
224
}
208
225
209
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
210
228
static bool add_environment(plugin *p, const char *def, bool replace){
211
229
if(p == NULL){
212
230
return false;
214
232
/* namelen = length of name of environment variable */
215
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
234
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
219
237
/* It already exists */
220
238
if(replace){
221
char *new;
239
char *new_envdef;
222
240
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
226
244
return false;
227
245
}
228
*e = new;
229
strcpy(*e, def);
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
230
248
}
231
249
return true;
232
250
}
234
252
return add_to_char_array(def, &(p->environ), &(p->envc));
235
253
}
236
254
255
#ifndef O_CLOEXEC
237
256
/*
238
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
258
* Descriptor Flags".
240
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
260
*/
261
__attribute__((warn_unused_result))
242
262
static int set_cloexec_flag(int fd){
243
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
264
/* If reading the flags failed, return error indication now. */
249
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
270
ret | FD_CLOEXEC));
251
271
}
272
#endif /* not O_CLOEXEC */
252
273
253
274
254
275
/* Mark processes as completed when they exit, and save their exit
286
307
}
287
308
288
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
289
311
static bool print_out_password(const char *buffer, size_t length){
290
312
ssize_t ret;
291
313
for(size_t written = 0; written < length; written += (size_t)ret){
299
321
}
300
322
301
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
302
325
static void free_plugin(plugin *plugin_node){
303
326
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
305
328
free(*arg);
306
329
}
330
free(plugin_node->name);
307
331
free(plugin_node->argv);
308
332
for(char **env = plugin_node->environ; *env != NULL; env++){
309
333
free(*env);
336
360
337
361
int main(int argc, char *argv[]){
338
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
339
364
char *argfile = NULL;
340
365
FILE *conffp;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
366
struct dirent **direntries = NULL;
344
367
struct stat st;
345
368
fd_set rfds_all;
346
369
int ret, maxfd = 0;
354
377
.sa_flags = SA_NOCLDSTOP };
355
378
char **custom_argv = NULL;
356
379
int custom_argc = 0;
380
int dir_fd = -1;
357
381
358
382
/* Establish a signal handler */
359
383
sigemptyset(&sigchld_action.sa_mask);
404
428
.doc = "Group ID the plugins will run as", .group = 3 },
405
429
{ .name = "debug", .key = 132,
406
430
.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 },
407
435
/*
408
436
* These reproduce what we would get without ARGP_NO_HELP
409
437
*/
416
444
{ .name = NULL }
417
445
};
418
446
447
__attribute__((nonnull(3)))
419
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
449
errno = 0;
421
450
switch(key){
422
451
char *tmp;
423
intmax_t tmpmax;
452
intmax_t tmp_id;
424
453
case 'g': /* --global-options */
425
454
{
426
455
char *plugin_option;
429
458
break;
430
459
}
431
460
}
461
errno = 0;
432
462
}
433
463
break;
434
464
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
436
468
break;
437
469
case 'o': /* --options-for */
438
470
{
455
487
break;
456
488
}
457
489
}
490
errno = 0;
458
491
}
459
492
break;
460
493
case 'E': /* --env-for */
472
505
errno = EINVAL;
473
506
break;
474
507
}
475
add_environment(getplugin(arg), envdef, true);
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
476
511
}
477
512
break;
478
513
case 'd': /* --disable */
480
515
plugin *p = getplugin(arg);
481
516
if(p != NULL){
482
517
p->disabled = true;
518
errno = 0;
483
519
}
484
520
}
485
521
break;
488
524
plugin *p = getplugin(arg);
489
525
if(p != NULL){
490
526
p->disabled = false;
527
errno = 0;
491
528
}
492
529
}
493
530
break;
494
531
case 128: /* --plugin-dir */
495
532
free(plugindir);
496
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
497
537
break;
498
538
case 129: /* --config-file */
499
539
/* This is already done by parse_opt_config_file() */
500
540
break;
501
541
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
503
543
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
544
or tmp_id != (uid_t)tmp_id){
505
545
argp_error(state, "Bad user ID number: \"%s\", using %"
506
546
PRIdMAX, arg, (intmax_t)uid);
507
547
break;
508
548
}
509
uid = (uid_t)tmpmax;
549
uid = (uid_t)tmp_id;
550
errno = 0;
510
551
break;
511
552
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
553
tmp_id = strtoimax(arg, &tmp, 10);
513
554
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
555
or tmp_id != (gid_t)tmp_id){
515
556
argp_error(state, "Bad group ID number: \"%s\", using %"
516
557
PRIdMAX, arg, (intmax_t)gid);
517
558
break;
518
559
}
519
gid = (gid_t)tmpmax;
560
gid = (gid_t)tmp_id;
561
errno = 0;
520
562
break;
521
563
case 132: /* --debug */
522
564
debug = true;
523
565
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
524
573
/*
525
574
* These reproduce what we would get without ARGP_NO_HELP
526
575
*/
527
576
case '?': /* --help */
528
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
530
580
case -3: /* --usage */
531
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
582
argp_state_help(state, state->out_stream,
533
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
534
585
case 'V': /* --version */
535
586
fprintf(state->out_stream, "%s\n", argp_program_version);
536
587
exit(EXIT_SUCCESS);
546
597
if(arg[0] == '\0'){
547
598
break;
548
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
549
605
default:
550
606
return ARGP_ERR_UNKNOWN;
551
607
}
570
626
case 129: /* --config-file */
571
627
free(argfile);
572
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
573
632
break;
574
633
case 130: /* --userid */
575
634
case 131: /* --groupid */
576
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
577
637
case '?': /* --help */
578
638
case -3: /* --usage */
579
639
case 'V': /* --version */
658
718
}
659
719
660
720
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
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
}
668
744
}
669
745
custom_argv[custom_argc-1] = new_arg;
670
746
custom_argv[custom_argc] = NULL;
728
804
goto fallback;
729
805
}
730
806
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
731
825
if(debug){
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
733
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
734
828
p->name ? p->name : "Global", p->argc - 1);
735
829
for(char **a = p->argv; *a != NULL; a++){
742
836
}
743
837
}
744
838
745
{
839
if(getuid() == 0){
746
840
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
841
<https://bugs.debian.org/633582> */
748
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
843
if(plugindir_fd == -1){
750
error(0, errno, "open");
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
751
847
} else {
752
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
849
if(ret == -1){
760
856
}
761
857
}
762
858
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
859
close(plugindir_fd);
764
860
}
765
861
}
766
862
767
863
/* Lower permissions */
768
setgid(gid);
864
ret = setgid(gid);
769
865
if(ret == -1){
770
866
error(0, errno, "setgid");
771
867
}
776
872
777
873
/* Open plugin directory with close_on_exec flag */
778
874
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
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
);
797
882
if(dir_fd == -1){
798
883
error(0, errno, "Could not open plugin dir");
799
884
exitstatus = EX_UNAVAILABLE;
805
890
ret = set_cloexec_flag(dir_fd);
806
891
if(ret < 0){
807
892
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
893
exitstatus = EX_OSERR;
810
894
goto fallback;
811
895
}
812
896
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
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
}
820
920
}
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;
821
931
}
822
932
823
933
FD_ZERO(&rfds_all);
824
934
825
935
/* Read and execute any executable in the plugin directory*/
826
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
830
831
/* All directory entries have been processed */
832
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
836
goto fallback;
837
}
838
break;
839
}
840
841
d_name_len = strlen(dirst->d_name);
842
843
/* Ignore dotfiles, backup files and other junk */
844
{
845
bool bad_name = false;
846
847
const char const *bad_prefixes[] = { ".", "#", NULL };
848
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
850
".dpkg-old",
851
".dpkg-bak",
852
".dpkg-divert", NULL };
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
size_t pre_len = strlen(*pre);
855
if((d_name_len >= pre_len)
856
and strncmp((dirst->d_name), *pre, pre_len) == 0){
857
if(debug){
858
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
" with bad prefix %s\n", dirst->d_name, *pre);
860
}
861
bad_name = true;
862
break;
863
}
864
}
865
if(bad_name){
866
continue;
867
}
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
size_t suf_len = strlen(*suf);
870
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
872
== 0)){
873
if(debug){
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
875
" with bad suffix %s\n", dirst->d_name, *suf);
876
}
877
bad_name = true;
878
break;
879
}
880
}
881
882
if(bad_name){
883
continue;
884
}
885
}
886
887
char *filename;
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
896
if(ret < 0){
897
error(0, errno, "asprintf");
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]);
898
942
continue;
899
943
}
900
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
902
945
if(ret == -1){
903
946
error(0, errno, "stat");
904
free(filename);
947
close(plugin_fd);
948
free(direntries[i]);
905
949
continue;
906
950
}
907
951
908
952
/* Ignore non-executable files */
909
953
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
911
956
if(debug){
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
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);
914
961
}
915
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
916
964
continue;
917
965
}
918
966
919
plugin *p = getplugin(dirst->d_name);
967
plugin *p = getplugin(direntries[i]->d_name);
920
968
if(p == NULL){
921
969
error(0, errno, "getplugin");
922
free(filename);
970
close(plugin_fd);
971
free(direntries[i]);
923
972
continue;
924
973
}
925
974
if(p->disabled){
926
975
if(debug){
927
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
928
dirst->d_name);
977
direntries[i]->d_name);
929
978
}
930
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
931
981
continue;
932
982
}
933
983
{
947
997
}
948
998
}
949
999
}
950
/* If this plugin has any environment variables, we will call
951
using execve and need to duplicate the environment from this
952
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
953
1002
if(p->environ[0] != NULL){
954
1003
for(char **e = environ; *e != NULL; e++){
955
1004
if(not add_environment(p, *e, false)){
959
1008
}
960
1009
961
1010
int pipefd[2];
1011
#ifndef O_CLOEXEC
962
1012
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 */
963
1016
if(ret == -1){
964
1017
error(0, errno, "pipe");
965
1018
exitstatus = EX_OSERR;
966
goto fallback;
967
}
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
968
1032
/* Ask OS to automatic close the pipe on exec */
969
1033
ret = set_cloexec_flag(pipefd[0]);
970
1034
if(ret < 0){
971
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
972
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
973
1040
goto fallback;
974
1041
}
975
1042
ret = set_cloexec_flag(pipefd[1]);
976
1043
if(ret < 0){
977
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
978
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
979
1049
goto fallback;
980
1050
}
1051
#endif /* not O_CLOEXEC */
981
1052
/* Block SIGCHLD until process is safely in process list */
982
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
1054
&sigchld_action.sa_mask,
985
1056
if(ret < 0){
986
1057
error(0, errno, "sigprocmask");
987
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
988
1060
goto fallback;
989
1061
}
990
1062
/* Starting a new process to be watched */
994
1066
} while(pid == -1 and errno == EINTR);
995
1067
if(pid == -1){
996
1068
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]);
997
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
998
1075
goto fallback;
999
1076
}
1000
1077
if(pid == 0){
1016
1093
_exit(EX_OSERR);
1017
1094
}
1018
1095
1019
if(dirfd(dir) < 0){
1020
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1021
above and must now close it manually here. */
1022
closedir(dir);
1023
}
1024
if(p->environ[0] == NULL){
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
1028
}
1029
} else {
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
1033
}
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);
1034
1102
}
1035
1103
/* no return */
1036
1104
}
1037
1105
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
1040
free(filename);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1042
1109
if(new_plugin == NULL){
1043
1110
error(0, errno, "getplugin");
1044
1111
ret = (int)(TEMP_FAILURE_RETRY
1048
1115
error(0, errno, "sigprocmask");
1049
1116
}
1050
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1051
1119
goto fallback;
1052
1120
}
1121
free(direntries[i]);
1053
1122
1054
1123
new_plugin->pid = pid;
1055
1124
new_plugin->fd = pipefd[0];
1056
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
1057
1131
/* Unblock SIGCHLD so signal handler can be run if this process
1058
1132
has already completed */
1059
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1065
1139
goto fallback;
1066
1140
}
1067
1141
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
1142
FD_SET(new_plugin->fd, &rfds_all);
1070
1143
1071
1144
if(maxfd < new_plugin->fd){
1072
1145
maxfd = new_plugin->fd;
1073
1146
}
1074
1147
}
1075
1148
1076
TEMP_FAILURE_RETRY(closedir(dir));
1077
dir = NULL;
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1078
1153
free_plugin(getplugin(NULL));
1079
1154
1080
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1119
1194
(intmax_t) (proc->pid),
1120
1195
WTERMSIG(proc->status),
1121
1196
strsignal(WTERMSIG(proc->status)));
1122
} else if(WCOREDUMP(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
1125
1197
}
1126
1198
}
1127
1199
1128
1200
/* Remove the plugin */
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1201
FD_CLR(proc->fd, &rfds_all);
1131
1202
1132
1203
/* Block signal while modifying process_list */
1133
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
1244
}
1174
1245
1175
1246
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1248
/* This process had nothing to say at this time */
1180
1249
proc = proc->next;
1181
1250
continue;
1182
1251
}
1183
1252
/* Before reading, make the process' data buffer large enough */
1184
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1188
1257
error(0, errno, "malloc");
1189
1258
exitstatus = EX_OSERR;
1190
1259
goto fallback;
1191
1260
}
1261
proc->buffer = new_buffer;
1192
1262
proc->buffer_size += BUFFER_SIZE;
1193
1263
}
1194
1264
/* Read from the process */
1247
1317
free(custom_argv);
1248
1318
}
1249
1319
1250
if(dir != NULL){
1251
closedir(dir);
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1252
1324
}
1253
1325
1254
1326
/* Kill the processes */
1274
1346
free_plugin_list();
1275
1347
1276
1348
free(plugindir);
1349
free(pluginhelperdir);
1277
1350
free(argfile);
1278
1351
1279
1352
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0