To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.2.210
- compare with another revision
- download diff
- download tarball
- view history from revision 237.2.210
- Committer: teddy at bsnet
- Date: 2010-09-27 17:39:03 UTC
- mto: (24.1.168 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20100927173903-9s5e6a3hl5iswmp7
* mandos: Fixed "--help" output.
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
* mandos.xml (SYNOPSIS, OPTIONS): Document new option "--debuglevel".
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2021 Teddy Hogeborn
6
* Copyright © 2008-2021 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 © 2008-2010 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
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
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.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;
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
98
83
99
84
typedef struct plugin{
100
85
char *name; /* can be NULL or any plugin name */
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))
191
174
static bool add_to_char_array(const char *new, char ***array,
192
175
int *len){
193
176
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
195
177
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);
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
210
181
/* Malloc check */
211
if(new_array == NULL){
182
if(*array == NULL){
212
183
return false;
213
184
}
214
*array = new_array;
215
185
/* Make a copy of the new string */
216
186
char *copy;
217
187
do {
229
199
}
230
200
231
201
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
233
202
static bool add_argument(plugin *p, const char *arg){
234
203
if(p == NULL){
235
204
return false;
238
207
}
239
208
240
209
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
242
210
static bool add_environment(plugin *p, const char *def, bool replace){
243
211
if(p == NULL){
244
212
return false;
246
214
/* namelen = length of name of environment variable */
247
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
248
216
/* Search for this environment variable */
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
251
219
/* It already exists */
252
220
if(replace){
253
char *new_envdef;
221
char *new;
254
222
do {
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
258
226
return false;
259
227
}
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
228
*e = new;
229
strcpy(*e, def);
262
230
}
263
231
return true;
264
232
}
266
234
return add_to_char_array(def, &(p->environ), &(p->envc));
267
235
}
268
236
269
#ifndef O_CLOEXEC
270
237
/*
271
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
272
239
* Descriptor Flags".
273
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
274
241
*/
275
__attribute__((warn_unused_result))
276
242
static int set_cloexec_flag(int fd){
277
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
278
244
/* If reading the flags failed, return error indication now. */
283
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
284
250
ret | FD_CLOEXEC));
285
251
}
286
#endif /* not O_CLOEXEC */
287
252
288
253
289
254
/* Mark processes as completed when they exit, and save their exit
321
286
}
322
287
323
288
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
325
289
static bool print_out_password(const char *buffer, size_t length){
326
290
ssize_t ret;
327
291
for(size_t written = 0; written < length; written += (size_t)ret){
335
299
}
336
300
337
301
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
339
302
static void free_plugin(plugin *plugin_node){
340
303
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
342
305
free(*arg);
343
306
}
344
free(plugin_node->name);
345
307
free(plugin_node->argv);
346
308
for(char **env = plugin_node->environ; *env != NULL; env++){
347
309
free(*env);
374
336
375
337
int main(int argc, char *argv[]){
376
338
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
378
339
char *argfile = NULL;
379
340
FILE *conffp;
380
struct dirent **direntries = NULL;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
381
344
struct stat st;
382
345
fd_set rfds_all;
383
346
int ret, maxfd = 0;
391
354
.sa_flags = SA_NOCLDSTOP };
392
355
char **custom_argv = NULL;
393
356
int custom_argc = 0;
394
int dir_fd = -1;
395
357
396
358
/* Establish a signal handler */
397
359
sigemptyset(&sigchld_action.sa_mask);
442
404
.doc = "Group ID the plugins will run as", .group = 3 },
443
405
{ .name = "debug", .key = 132,
444
406
.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
407
/*
450
408
* These reproduce what we would get without ARGP_NO_HELP
451
409
*/
458
416
{ .name = NULL }
459
417
};
460
418
461
__attribute__((nonnull(3)))
462
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
463
420
errno = 0;
464
421
switch(key){
465
422
char *tmp;
466
intmax_t tmp_id;
423
intmax_t tmpmax;
467
424
case 'g': /* --global-options */
468
425
{
469
426
char *plugin_option;
472
429
break;
473
430
}
474
431
}
475
errno = 0;
476
432
}
477
433
break;
478
434
case 'G': /* --global-env */
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
435
add_environment(getplugin(NULL), arg, true);
482
436
break;
483
437
case 'o': /* --options-for */
484
438
{
501
455
break;
502
456
}
503
457
}
504
errno = 0;
505
458
}
506
459
break;
507
460
case 'E': /* --env-for */
519
472
errno = EINVAL;
520
473
break;
521
474
}
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
475
add_environment(getplugin(arg), envdef, true);
525
476
}
526
477
break;
527
478
case 'd': /* --disable */
529
480
plugin *p = getplugin(arg);
530
481
if(p != NULL){
531
482
p->disabled = true;
532
errno = 0;
533
483
}
534
484
}
535
485
break;
538
488
plugin *p = getplugin(arg);
539
489
if(p != NULL){
540
490
p->disabled = false;
541
errno = 0;
542
491
}
543
492
}
544
493
break;
545
494
case 128: /* --plugin-dir */
546
495
free(plugindir);
547
496
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
551
497
break;
552
498
case 129: /* --config-file */
553
499
/* This is already done by parse_opt_config_file() */
554
500
break;
555
501
case 130: /* --userid */
556
tmp_id = strtoimax(arg, &tmp, 10);
502
tmpmax = strtoimax(arg, &tmp, 10);
557
503
if(errno != 0 or tmp == arg or *tmp != '\0'
558
or tmp_id != (uid_t)tmp_id){
504
or tmpmax != (uid_t)tmpmax){
559
505
argp_error(state, "Bad user ID number: \"%s\", using %"
560
506
PRIdMAX, arg, (intmax_t)uid);
561
507
break;
562
508
}
563
uid = (uid_t)tmp_id;
564
errno = 0;
509
uid = (uid_t)tmpmax;
565
510
break;
566
511
case 131: /* --groupid */
567
tmp_id = strtoimax(arg, &tmp, 10);
512
tmpmax = strtoimax(arg, &tmp, 10);
568
513
if(errno != 0 or tmp == arg or *tmp != '\0'
569
or tmp_id != (gid_t)tmp_id){
514
or tmpmax != (gid_t)tmpmax){
570
515
argp_error(state, "Bad group ID number: \"%s\", using %"
571
516
PRIdMAX, arg, (intmax_t)gid);
572
517
break;
573
518
}
574
gid = (gid_t)tmp_id;
575
errno = 0;
519
gid = (gid_t)tmpmax;
576
520
break;
577
521
case 132: /* --debug */
578
522
debug = true;
579
523
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
524
/*
588
525
* These reproduce what we would get without ARGP_NO_HELP
589
526
*/
590
527
case '?': /* --help */
591
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
592
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
594
530
case -3: /* --usage */
595
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
596
532
argp_state_help(state, state->out_stream,
597
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
599
534
case 'V': /* --version */
600
535
fprintf(state->out_stream, "%s\n", argp_program_version);
601
536
exit(EXIT_SUCCESS);
611
546
if(arg[0] == '\0'){
612
547
break;
613
548
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
619
549
default:
620
550
return ARGP_ERR_UNKNOWN;
621
551
}
640
570
case 129: /* --config-file */
641
571
free(argfile);
642
572
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
646
573
break;
647
574
case 130: /* --userid */
648
575
case 131: /* --groupid */
649
576
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
651
577
case '?': /* --help */
652
578
case -3: /* --usage */
653
579
case 'V': /* --version */
732
658
}
733
659
734
660
custom_argc += 1;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
738
sizeof(char *));
739
#else
740
char **new_argv = NULL;
741
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
742
/* overflow */
743
errno = ENOMEM;
744
} else {
745
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
746
* sizeof(char *));
747
}
748
#endif
749
if(new_argv == NULL){
750
error(0, errno, "reallocarray");
751
exitstatus = EX_OSERR;
752
free(new_arg);
753
free(org_line);
754
goto fallback;
755
} else {
756
custom_argv = new_argv;
757
}
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;
758
668
}
759
669
custom_argv[custom_argc-1] = new_arg;
760
670
custom_argv[custom_argc] = NULL;
818
728
goto fallback;
819
729
}
820
730
821
{
822
char *pluginhelperenv;
823
bool bret = true;
824
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
825
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
826
if(ret != -1){
827
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
828
}
829
if(ret == -1 or not bret){
830
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
831
" environment variable to \"%s\" for all plugins\n",
832
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
833
}
834
if(ret != -1){
835
free(pluginhelperenv);
836
}
837
}
838
839
731
if(debug){
840
for(plugin *p = plugin_list; p != NULL; p = p->next){
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
842
734
p->name ? p->name : "Global", p->argc - 1);
843
735
for(char **a = p->argv; *a != NULL; a++){
850
742
}
851
743
}
852
744
853
if(getuid() == 0){
854
/* Work around Debian bug #633582:
855
<https://bugs.debian.org/633582> */
856
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
857
if(plugindir_fd == -1){
858
if(errno != ENOENT){
859
error(0, errno, "open(\"" PDIR "\")");
860
}
861
} else {
862
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
863
if(ret == -1){
864
error(0, errno, "fstat");
865
} else {
866
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
867
ret = fchown(plugindir_fd, uid, gid);
868
if(ret == -1){
869
error(0, errno, "fchown");
870
}
871
}
872
}
873
close(plugindir_fd);
874
}
875
876
/* Work around Debian bug #981302
877
<https://bugs.debian.org/981302> */
878
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
879
ret = symlink("/proc/self/fd", "/dev/fd");
880
if(ret == -1){
881
error(0, errno, "Failed to create /dev/fd symlink");
882
}
883
}
884
}
885
886
/* Lower permissions */
887
ret = setgid(gid);
745
/* Strip permissions down to nobody */
746
setgid(gid);
888
747
if(ret == -1){
889
748
error(0, errno, "setgid");
890
749
}
895
754
896
755
/* Open plugin directory with close_on_exec flag */
897
756
{
898
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
899
#ifdef O_CLOEXEC
900
O_CLOEXEC
901
#else /* not O_CLOEXEC */
902
0
903
#endif /* not O_CLOEXEC */
904
);
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
905
775
if(dir_fd == -1){
906
776
error(0, errno, "Could not open plugin dir");
907
777
exitstatus = EX_UNAVAILABLE;
913
783
ret = set_cloexec_flag(dir_fd);
914
784
if(ret < 0){
915
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
916
787
exitstatus = EX_OSERR;
917
788
goto fallback;
918
789
}
919
790
#endif /* O_CLOEXEC */
920
}
921
922
int good_name(const struct dirent * const dirent){
923
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
924
"*.dpkg-old", "*.dpkg-bak",
925
"*.dpkg-divert", NULL };
926
#ifdef __GNUC__
927
#pragma GCC diagnostic push
928
#pragma GCC diagnostic ignored "-Wcast-qual"
929
#endif
930
for(const char **pat = (const char **)patterns;
931
*pat != NULL; pat++){
932
#ifdef __GNUC__
933
#pragma GCC diagnostic pop
934
#endif
935
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
936
!= FNM_NOMATCH){
937
if(debug){
938
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
939
" matching pattern %s\n", dirent->d_name, *pat);
940
}
941
return 0;
942
}
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
943
798
}
944
return 1;
945
}
946
947
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
948
alphasort);
949
if(numplugins == -1){
950
error(0, errno, "Could not scan plugin dir");
951
direntries = NULL;
952
exitstatus = EX_OSERR;
953
goto fallback;
954
799
}
955
800
956
801
FD_ZERO(&rfds_all);
957
802
958
803
/* Read and execute any executable in the plugin directory*/
959
for(int i = 0; i < numplugins; i++){
960
961
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
962
if(plugin_fd == -1){
963
error(0, errno, "Could not open plugin");
964
free(direntries[i]);
804
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
808
809
/* All directory entries have been processed */
810
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
814
goto fallback;
815
}
816
break;
817
}
818
819
d_name_len = strlen(dirst->d_name);
820
821
/* Ignore dotfiles, backup files and other junk */
822
{
823
bool bad_name = false;
824
825
const char const *bad_prefixes[] = { ".", "#", NULL };
826
827
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
".dpkg-old",
829
".dpkg-bak",
830
".dpkg-divert", NULL };
831
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
832
size_t pre_len = strlen(*pre);
833
if((d_name_len >= pre_len)
834
and strncmp((dirst->d_name), *pre, pre_len) == 0){
835
if(debug){
836
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
" with bad prefix %s\n", dirst->d_name, *pre);
838
}
839
bad_name = true;
840
break;
841
}
842
}
843
if(bad_name){
844
continue;
845
}
846
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
size_t suf_len = strlen(*suf);
848
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
850
== 0)){
851
if(debug){
852
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
853
" with bad suffix %s\n", dirst->d_name, *suf);
854
}
855
bad_name = true;
856
break;
857
}
858
}
859
860
if(bad_name){
861
continue;
862
}
863
}
864
865
char *filename;
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
874
if(ret < 0){
875
error(0, errno, "asprintf");
965
876
continue;
966
877
}
967
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
968
880
if(ret == -1){
969
881
error(0, errno, "stat");
970
close(plugin_fd);
971
free(direntries[i]);
882
free(filename);
972
883
continue;
973
884
}
974
885
975
886
/* Ignore non-executable files */
976
887
if(not S_ISREG(st.st_mode)
977
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
978
X_OK, 0)) != 0)){
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
979
889
if(debug){
980
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
981
" with bad type or mode\n",
982
plugindir != NULL ? plugindir : PDIR,
983
direntries[i]->d_name);
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
" with bad type or mode\n", filename);
984
892
}
985
close(plugin_fd);
986
free(direntries[i]);
893
free(filename);
987
894
continue;
988
895
}
989
896
990
plugin *p = getplugin(direntries[i]->d_name);
897
plugin *p = getplugin(dirst->d_name);
991
898
if(p == NULL){
992
899
error(0, errno, "getplugin");
993
close(plugin_fd);
994
free(direntries[i]);
900
free(filename);
995
901
continue;
996
902
}
997
903
if(p->disabled){
998
904
if(debug){
999
905
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
1000
direntries[i]->d_name);
906
dirst->d_name);
1001
907
}
1002
close(plugin_fd);
1003
free(direntries[i]);
908
free(filename);
1004
909
continue;
1005
910
}
1006
911
{
1020
925
}
1021
926
}
1022
927
}
1023
/* If this plugin has any environment variables, we need to
1024
duplicate the environment from this process, too. */
928
/* If this plugin has any environment variables, we will call
929
using execve and need to duplicate the environment from this
930
process, too. */
1025
931
if(p->environ[0] != NULL){
1026
932
for(char **e = environ; *e != NULL; e++){
1027
933
if(not add_environment(p, *e, false)){
1031
937
}
1032
938
1033
939
int pipefd[2];
1034
#ifndef O_CLOEXEC
1035
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1036
#else /* O_CLOEXEC */
1037
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1038
#endif /* O_CLOEXEC */
1039
941
if(ret == -1){
1040
942
error(0, errno, "pipe");
1041
943
exitstatus = EX_OSERR;
1042
free(direntries[i]);
1043
goto fallback;
1044
}
1045
if(pipefd[0] >= FD_SETSIZE){
1046
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1047
FD_SETSIZE);
1048
close(pipefd[0]);
1049
close(pipefd[1]);
1050
exitstatus = EX_OSERR;
1051
free(direntries[i]);
1052
goto fallback;
1053
}
1054
#ifndef O_CLOEXEC
944
goto fallback;
945
}
1055
946
/* Ask OS to automatic close the pipe on exec */
1056
947
ret = set_cloexec_flag(pipefd[0]);
1057
948
if(ret < 0){
1058
949
error(0, errno, "set_cloexec_flag");
1059
close(pipefd[0]);
1060
close(pipefd[1]);
1061
950
exitstatus = EX_OSERR;
1062
free(direntries[i]);
1063
951
goto fallback;
1064
952
}
1065
953
ret = set_cloexec_flag(pipefd[1]);
1066
954
if(ret < 0){
1067
955
error(0, errno, "set_cloexec_flag");
1068
close(pipefd[0]);
1069
close(pipefd[1]);
1070
956
exitstatus = EX_OSERR;
1071
free(direntries[i]);
1072
957
goto fallback;
1073
958
}
1074
#endif /* not O_CLOEXEC */
1075
959
/* Block SIGCHLD until process is safely in process list */
1076
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1077
961
&sigchld_action.sa_mask,
1079
963
if(ret < 0){
1080
964
error(0, errno, "sigprocmask");
1081
965
exitstatus = EX_OSERR;
1082
free(direntries[i]);
1083
966
goto fallback;
1084
967
}
1085
968
/* Starting a new process to be watched */
1089
972
} while(pid == -1 and errno == EINTR);
1090
973
if(pid == -1){
1091
974
error(0, errno, "fork");
1092
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1093
&sigchld_action.sa_mask, NULL));
1094
close(pipefd[0]);
1095
close(pipefd[1]);
1096
975
exitstatus = EX_OSERR;
1097
free(direntries[i]);
1098
976
goto fallback;
1099
977
}
1100
978
if(pid == 0){
1116
994
_exit(EX_OSERR);
1117
995
}
1118
996
1119
if(fexecve(plugin_fd, p->argv,
1120
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1121
error(0, errno, "fexecve for %s/%s",
1122
plugindir != NULL ? plugindir : PDIR,
1123
direntries[i]->d_name);
1124
_exit(EX_OSERR);
997
if(dirfd(dir) < 0){
998
/* If dir has no file descriptor, we could not set FD_CLOEXEC
999
above and must now close it manually here. */
1000
closedir(dir);
1001
}
1002
if(p->environ[0] == NULL){
1003
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
1006
}
1007
} else {
1008
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
1011
}
1125
1012
}
1126
1013
/* no return */
1127
1014
}
1128
1015
/* Parent process */
1129
close(pipefd[1]); /* Close unused write end of pipe */
1130
close(plugin_fd);
1131
plugin *new_plugin = getplugin(direntries[i]->d_name);
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
1018
free(filename);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1132
1020
if(new_plugin == NULL){
1133
1021
error(0, errno, "getplugin");
1134
1022
ret = (int)(TEMP_FAILURE_RETRY
1138
1026
error(0, errno, "sigprocmask");
1139
1027
}
1140
1028
exitstatus = EX_OSERR;
1141
free(direntries[i]);
1142
1029
goto fallback;
1143
1030
}
1144
free(direntries[i]);
1145
1031
1146
1032
new_plugin->pid = pid;
1147
1033
new_plugin->fd = pipefd[0];
1148
1149
if(debug){
1150
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1151
new_plugin->name, (intmax_t) (new_plugin->pid));
1152
}
1153
1034
1154
1035
/* Unblock SIGCHLD so signal handler can be run if this process
1155
1036
has already completed */
1156
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1162
1043
goto fallback;
1163
1044
}
1164
1045
1165
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1166
1048
1167
1049
if(maxfd < new_plugin->fd){
1168
1050
maxfd = new_plugin->fd;
1169
1051
}
1170
1052
}
1171
1053
1172
free(direntries);
1173
direntries = NULL;
1174
close(dir_fd);
1175
dir_fd = -1;
1054
TEMP_FAILURE_RETRY(closedir(dir));
1055
dir = NULL;
1176
1056
free_plugin(getplugin(NULL));
1177
1057
1178
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
1217
1097
(intmax_t) (proc->pid),
1218
1098
WTERMSIG(proc->status),
1219
1099
strsignal(WTERMSIG(proc->status)));
1100
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
1220
1103
}
1221
1104
}
1222
1105
1223
1106
/* Remove the plugin */
1224
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1225
1109
1226
1110
/* Block signal while modifying process_list */
1227
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1267
1151
}
1268
1152
1269
1153
/* This process has not completed. Does it have any output? */
1270
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1271
1157
/* This process had nothing to say at this time */
1272
1158
proc = proc->next;
1273
1159
continue;
1274
1160
}
1275
1161
/* Before reading, make the process' data buffer large enough */
1276
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1277
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1278
+ (size_t) BUFFER_SIZE);
1279
if(new_buffer == NULL){
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1280
1166
error(0, errno, "malloc");
1281
1167
exitstatus = EX_OSERR;
1282
1168
goto fallback;
1283
1169
}
1284
proc->buffer = new_buffer;
1285
1170
proc->buffer_size += BUFFER_SIZE;
1286
1171
}
1287
1172
/* Read from the process */
1340
1225
free(custom_argv);
1341
1226
}
1342
1227
1343
free(direntries);
1344
1345
if(dir_fd != -1){
1346
close(dir_fd);
1228
if(dir != NULL){
1229
closedir(dir);
1347
1230
}
1348
1231
1349
1232
/* Kill the processes */
1369
1252
free_plugin_list();
1370
1253
1371
1254
free(plugindir);
1372
free(pluginhelperdir);
1373
1255
free(argfile);
1374
1256
1375
1257
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0