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 550
- compare with another revision
- download diff
- download tarball
- view history from revision 550
- Committer: Teddy Hogeborn
- Date: 2012-01-01 20:45:53 UTC
- Revision ID: teddy@recompile.se-20120101204553-f1zlty873gswtf5n
* README: Hint that the intro(8mandos) manual page is in the server
package.
package.
- 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 © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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 © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 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
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
42
27
#include <stddef.h> /* size_t, NULL */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#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() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#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() */
63
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
84
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
85
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
89
75
90
76
#define BUFFER_SIZE 256
91
77
92
78
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
94
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
95
80
96
81
const char *argp_program_version = "plugin-runner " VERSION;
120
105
121
106
/* Gets an existing plugin based on name,
122
107
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
124
108
static plugin *getplugin(char *name){
125
109
/* Check for existing plugin with that name */
126
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
187
171
}
188
172
189
173
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
174
__attribute__((nonnull))
191
175
static bool add_to_char_array(const char *new, char ***array,
192
176
int *len){
193
177
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
178
do {
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} 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);
210
182
/* Malloc check */
211
if(new_array == NULL){
183
if(*array == NULL){
212
184
return false;
213
185
}
214
*array = new_array;
215
186
/* Make a copy of the new string */
216
187
char *copy;
217
188
do {
229
200
}
230
201
231
202
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
203
__attribute__((nonnull(2)))
233
204
static bool add_argument(plugin *p, const char *arg){
234
205
if(p == NULL){
235
206
return false;
238
209
}
239
210
240
211
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
212
__attribute__((nonnull(2)))
242
213
static bool add_environment(plugin *p, const char *def, bool replace){
243
214
if(p == NULL){
244
215
return false;
246
217
/* namelen = length of name of environment variable */
247
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
219
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
251
222
/* It already exists */
252
223
if(replace){
253
char *new_envdef;
224
char *new;
254
225
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
258
229
return false;
259
230
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
231
*e = new;
232
strcpy(*e, def);
262
233
}
263
234
return true;
264
235
}
266
237
return add_to_char_array(def, &(p->environ), &(p->envc));
267
238
}
268
239
269
#ifndef O_CLOEXEC
270
240
/*
271
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
242
* Descriptor Flags".
273
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
274
244
*/
275
__attribute__((warn_unused_result))
276
245
static int set_cloexec_flag(int fd){
277
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
278
247
/* If reading the flags failed, return error indication now. */
283
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
253
ret | FD_CLOEXEC));
285
254
}
286
#endif /* not O_CLOEXEC */
287
255
288
256
289
257
/* Mark processes as completed when they exit, and save their exit
321
289
}
322
290
323
291
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
292
__attribute__((nonnull))
325
293
static bool print_out_password(const char *buffer, size_t length){
326
294
ssize_t ret;
327
295
for(size_t written = 0; written < length; written += (size_t)ret){
338
306
__attribute__((nonnull))
339
307
static void free_plugin(plugin *plugin_node){
340
308
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
310
free(*arg);
343
311
}
344
free(plugin_node->name);
345
312
free(plugin_node->argv);
346
313
for(char **env = plugin_node->environ; *env != NULL; env++){
347
314
free(*env);
374
341
375
342
int main(int argc, char *argv[]){
376
343
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
344
char *argfile = NULL;
379
345
FILE *conffp;
380
struct dirent **direntries = NULL;
346
size_t d_name_len;
347
DIR *dir = NULL;
348
struct dirent *dirst;
381
349
struct stat st;
382
350
fd_set rfds_all;
383
351
int ret, maxfd = 0;
391
359
.sa_flags = SA_NOCLDSTOP };
392
360
char **custom_argv = NULL;
393
361
int custom_argc = 0;
394
int dir_fd = -1;
395
362
396
363
/* Establish a signal handler */
397
364
sigemptyset(&sigchld_action.sa_mask);
442
409
.doc = "Group ID the plugins will run as", .group = 3 },
443
410
{ .name = "debug", .key = 132,
444
411
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
449
412
/*
450
413
* These reproduce what we would get without ARGP_NO_HELP
451
414
*/
472
435
break;
473
436
}
474
437
}
475
errno = 0;
476
438
}
477
439
break;
478
440
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
441
add_environment(getplugin(NULL), arg, true);
482
442
break;
483
443
case 'o': /* --options-for */
484
444
{
501
461
break;
502
462
}
503
463
}
504
errno = 0;
505
464
}
506
465
break;
507
466
case 'E': /* --env-for */
519
478
errno = EINVAL;
520
479
break;
521
480
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
481
add_environment(getplugin(arg), envdef, true);
525
482
}
526
483
break;
527
484
case 'd': /* --disable */
529
486
plugin *p = getplugin(arg);
530
487
if(p != NULL){
531
488
p->disabled = true;
532
errno = 0;
533
489
}
534
490
}
535
491
break;
538
494
plugin *p = getplugin(arg);
539
495
if(p != NULL){
540
496
p->disabled = false;
541
errno = 0;
542
497
}
543
498
}
544
499
break;
545
500
case 128: /* --plugin-dir */
546
501
free(plugindir);
547
502
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
503
break;
552
504
case 129: /* --config-file */
553
505
/* This is already done by parse_opt_config_file() */
561
513
break;
562
514
}
563
515
uid = (uid_t)tmp_id;
564
errno = 0;
565
516
break;
566
517
case 131: /* --groupid */
567
518
tmp_id = strtoimax(arg, &tmp, 10);
572
523
break;
573
524
}
574
525
gid = (gid_t)tmp_id;
575
errno = 0;
576
526
break;
577
527
case 132: /* --debug */
578
528
debug = true;
579
529
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
587
530
/*
588
531
* These reproduce what we would get without ARGP_NO_HELP
589
532
*/
590
533
case '?': /* --help */
591
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
536
case -3: /* --usage */
595
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
538
argp_state_help(state, state->out_stream,
597
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
540
case 'V': /* --version */
600
541
fprintf(state->out_stream, "%s\n", argp_program_version);
601
542
exit(EXIT_SUCCESS);
611
552
if(arg[0] == '\0'){
612
553
break;
613
554
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
555
default:
620
556
return ARGP_ERR_UNKNOWN;
621
557
}
640
576
case 129: /* --config-file */
641
577
free(argfile);
642
578
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
579
break;
647
580
case 130: /* --userid */
648
581
case 131: /* --groupid */
649
582
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
583
case '?': /* --help */
652
584
case -3: /* --usage */
653
585
case 'V': /* --version */
732
664
}
733
665
734
666
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
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;
759
674
}
760
675
custom_argv[custom_argc-1] = new_arg;
761
676
custom_argv[custom_argc] = NULL;
819
734
goto fallback;
820
735
}
821
736
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
838
}
839
840
737
if(debug){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
842
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
843
740
p->name ? p->name : "Global", p->argc - 1);
844
741
for(char **a = p->argv; *a != NULL; a++){
853
750
854
751
if(getuid() == 0){
855
752
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
753
<http://bugs.debian.org/633582> */
857
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
755
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
756
error(0, errno, "open");
862
757
} else {
863
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
759
if(ret == -1){
871
766
}
872
767
}
873
768
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
884
770
}
885
771
}
886
772
887
773
/* Lower permissions */
888
ret = setgid(gid);
774
setgid(gid);
889
775
if(ret == -1){
890
776
error(0, errno, "setgid");
891
777
}
896
782
897
783
/* Open plugin directory with close_on_exec flag */
898
784
{
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
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
}
906
803
if(dir_fd == -1){
907
804
error(0, errno, "Could not open plugin dir");
908
805
exitstatus = EX_UNAVAILABLE;
914
811
ret = set_cloexec_flag(dir_fd);
915
812
if(ret < 0){
916
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
917
815
exitstatus = EX_OSERR;
918
816
goto fallback;
919
817
}
920
818
#endif /* O_CLOEXEC */
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
943
}
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;
944
826
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
955
827
}
956
828
957
829
FD_ZERO(&rfds_all);
958
830
959
831
/* Read and execute any executable in the plugin directory*/
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
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");
966
904
continue;
967
905
}
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
906
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
969
908
if(ret == -1){
970
909
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
910
free(filename);
973
911
continue;
974
912
}
975
913
976
914
/* Ignore non-executable files */
977
915
if(not S_ISREG(st.st_mode)
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
980
917
if(debug){
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
" with bad type or mode\n", filename);
985
920
}
986
close(plugin_fd);
987
free(direntries[i]);
921
free(filename);
988
922
continue;
989
923
}
990
924
991
plugin *p = getplugin(direntries[i]->d_name);
925
plugin *p = getplugin(dirst->d_name);
992
926
if(p == NULL){
993
927
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
928
free(filename);
996
929
continue;
997
930
}
998
931
if(p->disabled){
999
932
if(debug){
1000
933
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1001
direntries[i]->d_name);
934
dirst->d_name);
1002
935
}
1003
close(plugin_fd);
1004
free(direntries[i]);
936
free(filename);
1005
937
continue;
1006
938
}
1007
939
{
1021
953
}
1022
954
}
1023
955
}
1024
/* If this plugin has any environment variables, we need to
1025
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. */
1026
959
if(p->environ[0] != NULL){
1027
960
for(char **e = environ; *e != NULL; e++){
1028
961
if(not add_environment(p, *e, false)){
1032
965
}
1033
966
1034
967
int pipefd[2];
1035
#ifndef O_CLOEXEC
1036
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
1040
969
if(ret == -1){
1041
970
error(0, errno, "pipe");
1042
971
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
972
goto fallback;
973
}
1056
974
/* Ask OS to automatic close the pipe on exec */
1057
975
ret = set_cloexec_flag(pipefd[0]);
1058
976
if(ret < 0){
1059
977
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
1062
978
exitstatus = EX_OSERR;
1063
free(direntries[i]);
1064
979
goto fallback;
1065
980
}
1066
981
ret = set_cloexec_flag(pipefd[1]);
1067
982
if(ret < 0){
1068
983
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
1071
984
exitstatus = EX_OSERR;
1072
free(direntries[i]);
1073
985
goto fallback;
1074
986
}
1075
#endif /* not O_CLOEXEC */
1076
987
/* Block SIGCHLD until process is safely in process list */
1077
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1078
989
&sigchld_action.sa_mask,
1080
991
if(ret < 0){
1081
992
error(0, errno, "sigprocmask");
1082
993
exitstatus = EX_OSERR;
1083
free(direntries[i]);
1084
994
goto fallback;
1085
995
}
1086
996
/* Starting a new process to be watched */
1090
1000
} while(pid == -1 and errno == EINTR);
1091
1001
if(pid == -1){
1092
1002
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
1097
1003
exitstatus = EX_OSERR;
1098
free(direntries[i]);
1099
1004
goto fallback;
1100
1005
}
1101
1006
if(pid == 0){
1117
1022
_exit(EX_OSERR);
1118
1023
}
1119
1024
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_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
}
1126
1040
}
1127
1041
/* no return */
1128
1042
}
1129
1043
/* Parent process */
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
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);
1133
1048
if(new_plugin == NULL){
1134
1049
error(0, errno, "getplugin");
1135
1050
ret = (int)(TEMP_FAILURE_RETRY
1139
1054
error(0, errno, "sigprocmask");
1140
1055
}
1141
1056
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1143
1057
goto fallback;
1144
1058
}
1145
free(direntries[i]);
1146
1059
1147
1060
new_plugin->pid = pid;
1148
1061
new_plugin->fd = pipefd[0];
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
1062
1155
1063
/* Unblock SIGCHLD so signal handler can be run if this process
1156
1064
has already completed */
1157
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1163
1071
goto fallback;
1164
1072
}
1165
1073
1166
FD_SET(new_plugin->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
1167
1076
1168
1077
if(maxfd < new_plugin->fd){
1169
1078
maxfd = new_plugin->fd;
1170
1079
}
1171
1080
}
1172
1081
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1082
TEMP_FAILURE_RETRY(closedir(dir));
1083
dir = NULL;
1177
1084
free_plugin(getplugin(NULL));
1178
1085
1179
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1218
1125
(intmax_t) (proc->pid),
1219
1126
WTERMSIG(proc->status),
1220
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));
1221
1131
}
1222
1132
}
1223
1133
1224
1134
/* Remove the plugin */
1225
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1226
1137
1227
1138
/* Block signal while modifying process_list */
1228
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1268
1179
}
1269
1180
1270
1181
/* This process has not completed. Does it have any output? */
1271
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 */
1272
1185
/* This process had nothing to say at this time */
1273
1186
proc = proc->next;
1274
1187
continue;
1275
1188
}
1276
1189
/* Before reading, make the process' data buffer large enough */
1277
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1281
1194
error(0, errno, "malloc");
1282
1195
exitstatus = EX_OSERR;
1283
1196
goto fallback;
1284
1197
}
1285
proc->buffer = new_buffer;
1286
1198
proc->buffer_size += BUFFER_SIZE;
1287
1199
}
1288
1200
/* Read from the process */
1341
1253
free(custom_argv);
1342
1254
}
1343
1255
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1256
if(dir != NULL){
1257
closedir(dir);
1348
1258
}
1349
1259
1350
1260
/* Kill the processes */
1370
1280
free_plugin_list();
1371
1281
1372
1282
free(plugindir);
1373
free(pluginhelperdir);
1374
1283
free(argfile);
1375
1284
1376
1285
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0