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- Committer: Teddy Hogeborn
- Date: 2010-10-07 18:21:13 UTC
- mfrom: (237.7.4 mandos)
- Revision ID: teddy@fukt.bsnet.se-20101007182113-a9n1q0dklh6q1x94
Merge from trunk.
- files added:
- initramfs-tools-hook-conf
- files removed:
- bugs.xml
- debian/tests
- debian/upstream
- 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 © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 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
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
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
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;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
82
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
83
85
84
typedef struct plugin{
86
85
char *name; /* can be NULL or any plugin name */
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))
177
174
static bool add_to_char_array(const char *new, char ***array,
178
175
int *len){
179
176
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
177
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} 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);
185
181
/* Malloc check */
186
if(new_array == NULL){
182
if(*array == NULL){
187
183
return false;
188
184
}
189
*array = new_array;
190
185
/* Make a copy of the new string */
191
186
char *copy;
192
187
do {
204
199
}
205
200
206
201
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
202
static bool add_argument(plugin *p, const char *arg){
209
203
if(p == NULL){
210
204
return false;
213
207
}
214
208
215
209
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
210
static bool add_environment(plugin *p, const char *def, bool replace){
218
211
if(p == NULL){
219
212
return false;
221
214
/* namelen = length of name of environment variable */
222
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
216
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
226
219
/* It already exists */
227
220
if(replace){
228
char *new_envdef;
221
char *new;
229
222
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
233
226
return false;
234
227
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
228
*e = new;
229
strcpy(*e, def);
237
230
}
238
231
return true;
239
232
}
241
234
return add_to_char_array(def, &(p->environ), &(p->envc));
242
235
}
243
236
244
#ifndef O_CLOEXEC
245
237
/*
246
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
239
* Descriptor Flags".
248
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
241
*/
250
__attribute__((warn_unused_result))
251
242
static int set_cloexec_flag(int fd){
252
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
253
244
/* If reading the flags failed, return error indication now. */
258
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
250
ret | FD_CLOEXEC));
260
251
}
261
#endif /* not O_CLOEXEC */
262
252
263
253
264
254
/* Mark processes as completed when they exit, and save their exit
296
286
}
297
287
298
288
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
289
static bool print_out_password(const char *buffer, size_t length){
301
290
ssize_t ret;
302
291
for(size_t written = 0; written < length; written += (size_t)ret){
310
299
}
311
300
312
301
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
302
static void free_plugin(plugin *plugin_node){
315
303
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
305
free(*arg);
318
306
}
319
free(plugin_node->name);
320
307
free(plugin_node->argv);
321
308
for(char **env = plugin_node->environ; *env != NULL; env++){
322
309
free(*env);
349
336
350
337
int main(int argc, char *argv[]){
351
338
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
339
char *argfile = NULL;
354
340
FILE *conffp;
355
struct dirent **direntries = NULL;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
356
344
struct stat st;
357
345
fd_set rfds_all;
358
346
int ret, maxfd = 0;
366
354
.sa_flags = SA_NOCLDSTOP };
367
355
char **custom_argv = NULL;
368
356
int custom_argc = 0;
369
int dir_fd = -1;
370
357
371
358
/* Establish a signal handler */
372
359
sigemptyset(&sigchld_action.sa_mask);
417
404
.doc = "Group ID the plugins will run as", .group = 3 },
418
405
{ .name = "debug", .key = 132,
419
406
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
407
/*
425
408
* These reproduce what we would get without ARGP_NO_HELP
426
409
*/
433
416
{ .name = NULL }
434
417
};
435
418
436
__attribute__((nonnull(3)))
437
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
420
errno = 0;
439
421
switch(key){
440
422
char *tmp;
441
intmax_t tmp_id;
423
intmax_t tmpmax;
442
424
case 'g': /* --global-options */
443
425
{
444
426
char *plugin_option;
447
429
break;
448
430
}
449
431
}
450
errno = 0;
451
432
}
452
433
break;
453
434
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
435
add_environment(getplugin(NULL), arg, true);
457
436
break;
458
437
case 'o': /* --options-for */
459
438
{
476
455
break;
477
456
}
478
457
}
479
errno = 0;
480
458
}
481
459
break;
482
460
case 'E': /* --env-for */
494
472
errno = EINVAL;
495
473
break;
496
474
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
475
add_environment(getplugin(arg), envdef, true);
500
476
}
501
477
break;
502
478
case 'd': /* --disable */
504
480
plugin *p = getplugin(arg);
505
481
if(p != NULL){
506
482
p->disabled = true;
507
errno = 0;
508
483
}
509
484
}
510
485
break;
513
488
plugin *p = getplugin(arg);
514
489
if(p != NULL){
515
490
p->disabled = false;
516
errno = 0;
517
491
}
518
492
}
519
493
break;
520
494
case 128: /* --plugin-dir */
521
495
free(plugindir);
522
496
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
497
break;
527
498
case 129: /* --config-file */
528
499
/* This is already done by parse_opt_config_file() */
529
500
break;
530
501
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
502
tmpmax = strtoimax(arg, &tmp, 10);
532
503
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
504
or tmpmax != (uid_t)tmpmax){
534
505
argp_error(state, "Bad user ID number: \"%s\", using %"
535
506
PRIdMAX, arg, (intmax_t)uid);
536
507
break;
537
508
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
509
uid = (uid_t)tmpmax;
540
510
break;
541
511
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
512
tmpmax = strtoimax(arg, &tmp, 10);
543
513
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
514
or tmpmax != (gid_t)tmpmax){
545
515
argp_error(state, "Bad group ID number: \"%s\", using %"
546
516
PRIdMAX, arg, (intmax_t)gid);
547
517
break;
548
518
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
519
gid = (gid_t)tmpmax;
551
520
break;
552
521
case 132: /* --debug */
553
522
debug = true;
554
523
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
524
/*
563
525
* These reproduce what we would get without ARGP_NO_HELP
564
526
*/
565
527
case '?': /* --help */
566
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
530
case -3: /* --usage */
570
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
532
argp_state_help(state, state->out_stream,
572
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
534
case 'V': /* --version */
575
535
fprintf(state->out_stream, "%s\n", argp_program_version);
576
536
exit(EXIT_SUCCESS);
586
546
if(arg[0] == '\0'){
587
547
break;
588
548
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
594
549
default:
595
550
return ARGP_ERR_UNKNOWN;
596
551
}
615
570
case 129: /* --config-file */
616
571
free(argfile);
617
572
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
620
}
621
573
break;
622
574
case 130: /* --userid */
623
575
case 131: /* --groupid */
624
576
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
577
case '?': /* --help */
627
578
case -3: /* --usage */
628
579
case 'V': /* --version */
707
658
}
708
659
709
660
custom_argc += 1;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
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;
722
668
}
723
669
custom_argv[custom_argc-1] = new_arg;
724
670
custom_argv[custom_argc] = NULL;
782
728
goto fallback;
783
729
}
784
730
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
801
}
802
803
731
if(debug){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
734
p->name ? p->name : "Global", p->argc - 1);
807
735
for(char **a = p->argv; *a != NULL; a++){
814
742
}
815
743
}
816
744
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
745
/* Strip permissions down to nobody */
746
setgid(gid);
843
747
if(ret == -1){
844
748
error(0, errno, "setgid");
845
749
}
850
754
851
755
/* Open plugin directory with close_on_exec flag */
852
756
{
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
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
}
860
775
if(dir_fd == -1){
861
776
error(0, errno, "Could not open plugin dir");
862
777
exitstatus = EX_UNAVAILABLE;
868
783
ret = set_cloexec_flag(dir_fd);
869
784
if(ret < 0){
870
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
871
787
exitstatus = EX_OSERR;
872
788
goto fallback;
873
789
}
874
790
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
897
}
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;
898
798
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
909
799
}
910
800
911
801
FD_ZERO(&rfds_all);
912
802
913
803
/* Read and execute any executable in the plugin directory*/
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
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");
920
876
continue;
921
877
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
923
880
if(ret == -1){
924
881
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
882
free(filename);
927
883
continue;
928
884
}
929
885
930
886
/* Ignore non-executable files */
931
887
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
934
889
if(debug){
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
" with bad type or mode\n", filename);
939
892
}
940
close(plugin_fd);
941
free(direntries[i]);
893
free(filename);
942
894
continue;
943
895
}
944
896
945
plugin *p = getplugin(direntries[i]->d_name);
897
plugin *p = getplugin(dirst->d_name);
946
898
if(p == NULL){
947
899
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
900
free(filename);
950
901
continue;
951
902
}
952
903
if(p->disabled){
953
904
if(debug){
954
905
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
955
direntries[i]->d_name);
906
dirst->d_name);
956
907
}
957
close(plugin_fd);
958
free(direntries[i]);
908
free(filename);
959
909
continue;
960
910
}
961
911
{
975
925
}
976
926
}
977
927
}
978
/* If this plugin has any environment variables, we need to
979
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. */
980
931
if(p->environ[0] != NULL){
981
932
for(char **e = environ; *e != NULL; e++){
982
933
if(not add_environment(p, *e, false)){
986
937
}
987
938
988
939
int pipefd[2];
989
#ifndef O_CLOEXEC
990
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
941
if(ret == -1){
995
942
error(0, errno, "pipe");
996
943
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
944
goto fallback;
945
}
1010
946
/* Ask OS to automatic close the pipe on exec */
1011
947
ret = set_cloexec_flag(pipefd[0]);
1012
948
if(ret < 0){
1013
949
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
950
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1018
951
goto fallback;
1019
952
}
1020
953
ret = set_cloexec_flag(pipefd[1]);
1021
954
if(ret < 0){
1022
955
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
956
exitstatus = EX_OSERR;
1026
free(direntries[i]);
1027
957
goto fallback;
1028
958
}
1029
#endif /* not O_CLOEXEC */
1030
959
/* Block SIGCHLD until process is safely in process list */
1031
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
961
&sigchld_action.sa_mask,
1034
963
if(ret < 0){
1035
964
error(0, errno, "sigprocmask");
1036
965
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
966
goto fallback;
1039
967
}
1040
968
/* Starting a new process to be watched */
1044
972
} while(pid == -1 and errno == EINTR);
1045
973
if(pid == -1){
1046
974
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
975
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
976
goto fallback;
1054
977
}
1055
978
if(pid == 0){
1071
994
_exit(EX_OSERR);
1072
995
}
1073
996
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_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
}
1080
1012
}
1081
1013
/* no return */
1082
1014
}
1083
1015
/* Parent process */
1084
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1086
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);
1087
1020
if(new_plugin == NULL){
1088
1021
error(0, errno, "getplugin");
1089
1022
ret = (int)(TEMP_FAILURE_RETRY
1093
1026
error(0, errno, "sigprocmask");
1094
1027
}
1095
1028
exitstatus = EX_OSERR;
1096
free(direntries[i]);
1097
1029
goto fallback;
1098
1030
}
1099
free(direntries[i]);
1100
1031
1101
1032
new_plugin->pid = pid;
1102
1033
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
1034
1109
1035
/* Unblock SIGCHLD so signal handler can be run if this process
1110
1036
has already completed */
1111
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1117
1043
goto fallback;
1118
1044
}
1119
1045
1120
FD_SET(new_plugin->fd, &rfds_all);
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
1121
1048
1122
1049
if(maxfd < new_plugin->fd){
1123
1050
maxfd = new_plugin->fd;
1124
1051
}
1125
1052
}
1126
1053
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1054
TEMP_FAILURE_RETRY(closedir(dir));
1055
dir = NULL;
1131
1056
free_plugin(getplugin(NULL));
1132
1057
1133
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
1172
1097
(intmax_t) (proc->pid),
1173
1098
WTERMSIG(proc->status),
1174
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));
1175
1103
}
1176
1104
}
1177
1105
1178
1106
/* Remove the plugin */
1179
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1180
1109
1181
1110
/* Block signal while modifying process_list */
1182
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1222
1151
}
1223
1152
1224
1153
/* This process has not completed. Does it have any output? */
1225
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 */
1226
1157
/* This process had nothing to say at this time */
1227
1158
proc = proc->next;
1228
1159
continue;
1229
1160
}
1230
1161
/* Before reading, make the process' data buffer large enough */
1231
1162
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1163
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1235
1166
error(0, errno, "malloc");
1236
1167
exitstatus = EX_OSERR;
1237
1168
goto fallback;
1238
1169
}
1239
proc->buffer = new_buffer;
1240
1170
proc->buffer_size += BUFFER_SIZE;
1241
1171
}
1242
1172
/* Read from the process */
1295
1225
free(custom_argv);
1296
1226
}
1297
1227
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1228
if(dir != NULL){
1229
closedir(dir);
1302
1230
}
1303
1231
1304
1232
/* Kill the processes */
1324
1252
free_plugin_list();
1325
1253
1326
1254
free(plugindir);
1327
free(pluginhelperdir);
1328
1255
free(argfile);
1329
1256
1330
1257
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0