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- Committer: Björn Påhlsson
- Date: 2009-09-21 13:13:47 UTC
- mfrom: (237.2.127 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090921131347-mhuf1qnwavhyd6l1
fixed incorrect include comments
added
removed
plugin-runner.c
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
42
42
WCOREDUMP() */
43
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
46
readdir(), closedir(), dirfd() */
47
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
48
fcntl(), setuid(), setgid(),
68
68
*/
69
69
#include <errno.h> /* errno, EBADF */
70
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
71
76
72
#define BUFFER_SIZE 256
77
73
106
102
/* Gets an existing plugin based on name,
107
103
or if none is found, creates a new one */
108
104
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
105
/* Check for exiting plugin with that name */
110
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
107
if((p->name == name)
112
108
or (p->name and name and (strcmp(p->name, name) == 0))){
127
123
copy_name = strdup(name);
128
124
} while(copy_name == NULL and errno == EINTR);
129
125
if(copy_name == NULL){
130
int e = errno;
131
126
free(new_plugin);
132
errno = e;
133
127
return NULL;
134
128
}
135
129
}
143
137
new_plugin->argv = malloc(sizeof(char *) * 2);
144
138
} while(new_plugin->argv == NULL and errno == EINTR);
145
139
if(new_plugin->argv == NULL){
146
int e = errno;
147
140
free(copy_name);
148
141
free(new_plugin);
149
errno = e;
150
142
return NULL;
151
143
}
152
144
new_plugin->argv[0] = copy_name;
156
148
new_plugin->environ = malloc(sizeof(char *));
157
149
} while(new_plugin->environ == NULL and errno == EINTR);
158
150
if(new_plugin->environ == NULL){
159
int e = errno;
160
151
free(copy_name);
161
152
free(new_plugin->argv);
162
153
free(new_plugin);
163
errno = e;
164
154
return NULL;
165
155
}
166
156
new_plugin->environ[0] = NULL;
240
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
231
*/
242
232
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
234
/* If reading the flags failed, return error indication now. */
245
235
if(ret < 0){
246
236
return ret;
247
237
}
248
238
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
251
240
}
252
241
253
242
268
257
/* No child processes */
269
258
break;
270
259
}
271
error(0, errno, "waitpid");
260
perror("waitpid");
272
261
}
273
262
274
263
/* A child exited, find it in process_list */
359
348
sigemptyset(&sigchld_action.sa_mask);
360
349
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
350
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
351
perror("sigaddset");
352
exitstatus = EXIT_FAILURE;
364
353
goto fallback;
365
354
}
366
355
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
356
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
357
perror("sigaction");
358
exitstatus = EXIT_FAILURE;
370
359
goto fallback;
371
360
}
372
361
404
393
.doc = "Group ID the plugins will run as", .group = 3 },
405
394
{ .name = "debug", .key = 132,
406
395
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
396
{ .name = NULL }
417
397
};
418
398
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
421
401
switch(key){
422
402
char *tmp;
423
403
intmax_t tmpmax;
424
404
case 'g': /* --global-options */
425
{
405
if(arg != NULL){
426
406
char *plugin_option;
427
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
409
continue;
410
}
428
411
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
430
414
}
431
415
}
432
416
}
433
417
break;
434
418
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
419
if(arg == NULL){
420
break;
421
}
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
424
}
436
425
break;
437
426
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
427
if(arg != NULL){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
430
break;
431
}
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
456
437
}
457
438
}
458
439
}
459
440
break;
460
441
case 'E': /* --env-for */
442
if(arg == NULL){
443
break;
444
}
461
445
{
462
446
char *envdef = strchr(arg, ':');
463
447
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
448
break;
467
449
}
468
450
*envdef = '\0';
469
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
474
453
}
475
add_environment(getplugin(arg), envdef, true);
476
454
}
477
455
break;
478
456
case 'd': /* --disable */
479
{
457
if(arg != NULL){
480
458
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
459
if(p == NULL){
460
return ARGP_ERR_UNKNOWN;
483
461
}
462
p->disabled = true;
484
463
}
485
464
break;
486
465
case 'e': /* --enable */
487
{
466
if(arg != NULL){
488
467
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
468
if(p == NULL){
469
return ARGP_ERR_UNKNOWN;
491
470
}
471
p->disabled = false;
492
472
}
493
473
break;
494
474
case 128: /* --plugin-dir */
495
475
free(plugindir);
496
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
478
perror("strdup");
479
}
497
480
break;
498
481
case 129: /* --config-file */
499
482
/* This is already done by parse_opt_config_file() */
500
483
break;
501
484
case 130: /* --userid */
485
errno = 0;
502
486
tmpmax = strtoimax(arg, &tmp, 10);
503
487
if(errno != 0 or tmp == arg or *tmp != '\0'
504
488
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
491
} else {
492
uid = (uid_t)tmpmax;
508
493
}
509
uid = (uid_t)tmpmax;
510
494
break;
511
495
case 131: /* --groupid */
496
errno = 0;
512
497
tmpmax = strtoimax(arg, &tmp, 10);
513
498
if(errno != 0 or tmp == arg or *tmp != '\0'
514
499
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
502
} else {
503
gid = (gid_t)tmpmax;
518
504
}
519
gid = (gid_t)tmpmax;
520
505
break;
521
506
case 132: /* --debug */
522
507
debug = true;
523
508
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
509
/*
539
510
* When adding more options before this line, remember to also add a
540
511
* "case" to the "parse_opt_config_file" function below.
543
514
/* Cryptsetup always passes an argument, which is an empty
544
515
string if "none" was specified in /etc/crypttab. So if
545
516
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
517
if(arg[0] != '\0'){
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
548
519
}
520
break;
521
case ARGP_KEY_END:
522
break;
549
523
default:
550
524
return ARGP_ERR_UNKNOWN;
551
525
}
552
return errno; /* Set to 0 at start */
526
return 0;
553
527
}
554
528
555
529
/* This option parser is the same as parse_opt() above, except it
557
531
error_t parse_opt_config_file(int key, char *arg,
558
532
__attribute__((unused))
559
533
struct argp_state *state){
560
errno = 0;
561
534
switch(key){
562
535
case 'g': /* --global-options */
563
536
case 'G': /* --global-env */
570
543
case 129: /* --config-file */
571
544
free(argfile);
572
545
argfile = strdup(arg);
546
if(argfile == NULL){
547
perror("strdup");
548
}
573
549
break;
574
550
case 130: /* --userid */
575
551
case 131: /* --groupid */
576
552
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
553
case ARGP_KEY_ARG:
554
case ARGP_KEY_END:
581
555
break;
582
556
default:
583
557
return ARGP_ERR_UNKNOWN;
584
558
}
585
return errno;
559
return 0;
586
560
}
587
561
588
562
struct argp argp = { .options = options,
592
566
593
567
/* Parse using parse_opt_config_file() in order to get the custom
594
568
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
exitstatus = EXIT_FAILURE;
609
573
goto fallback;
610
574
}
611
575
628
592
custom_argc = 1;
629
593
custom_argv = malloc(sizeof(char*) * 2);
630
594
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
595
perror("malloc");
596
exitstatus = EXIT_FAILURE;
633
597
goto fallback;
634
598
}
635
599
custom_argv[0] = argv[0];
651
615
}
652
616
new_arg = strdup(p);
653
617
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
618
perror("strdup");
619
exitstatus = EXIT_FAILURE;
656
620
free(org_line);
657
621
goto fallback;
658
622
}
661
625
custom_argv = realloc(custom_argv, sizeof(char *)
662
626
* ((unsigned int) custom_argc + 1));
663
627
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
628
perror("realloc");
629
exitstatus = EXIT_FAILURE;
666
630
free(org_line);
667
631
goto fallback;
668
632
}
674
638
ret = fclose(conffp);
675
639
} while(ret == EOF and errno == EINTR);
676
640
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
641
perror("fclose");
642
exitstatus = EXIT_FAILURE;
679
643
goto fallback;
680
644
}
681
645
free(org_line);
683
647
/* Check for harmful errors and go to fallback. Other errors might
684
648
not affect opening plugins */
685
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
650
perror("fopen");
651
exitstatus = EXIT_FAILURE;
688
652
goto fallback;
689
653
}
690
654
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
693
657
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
659
0, NULL);
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
708
663
goto fallback;
709
664
}
710
665
}
711
666
712
667
/* Parse actual command line arguments, to let them override the
713
668
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
728
673
goto fallback;
729
674
}
730
675
745
690
/* Strip permissions down to nobody */
746
691
setgid(gid);
747
692
if(ret == -1){
748
error(0, errno, "setgid");
693
perror("setgid");
749
694
}
750
695
ret = setuid(uid);
751
696
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
697
perror("setuid");
698
}
699
700
if(plugindir == NULL){
701
dir = opendir(PDIR);
702
} else {
703
dir = opendir(plugindir);
704
}
705
706
if(dir == NULL){
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
713
{
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
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
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;
714
int dir_fd = dirfd(dir);
715
if(dir_fd >= 0){
716
ret = set_cloexec_flag(dir_fd);
717
if(ret < 0){
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
720
goto fallback;
721
}
798
722
}
799
723
}
800
724
809
733
/* All directory entries have been processed */
810
734
if(dirst == NULL){
811
735
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
736
perror("readdir");
737
exitstatus = EXIT_FAILURE;
814
738
goto fallback;
815
739
}
816
740
break;
864
788
865
789
char *filename;
866
790
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
792
dirst->d_name));
869
793
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
795
dirst->d_name));
873
796
}
874
797
if(ret < 0){
875
error(0, errno, "asprintf");
798
perror("asprintf");
876
799
continue;
877
800
}
878
801
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
880
803
if(ret == -1){
881
error(0, errno, "stat");
804
perror("stat");
882
805
free(filename);
883
806
continue;
884
807
}
896
819
897
820
plugin *p = getplugin(dirst->d_name);
898
821
if(p == NULL){
899
error(0, errno, "getplugin");
822
perror("getplugin");
900
823
free(filename);
901
824
continue;
902
825
}
914
837
if(g != NULL){
915
838
for(char **a = g->argv + 1; *a != NULL; a++){
916
839
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
840
perror("add_argument");
918
841
}
919
842
}
920
843
/* Add global environment variables */
921
844
for(char **e = g->environ; *e != NULL; e++){
922
845
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
846
perror("add_environment");
924
847
}
925
848
}
926
849
}
931
854
if(p->environ[0] != NULL){
932
855
for(char **e = environ; *e != NULL; e++){
933
856
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
857
perror("add_environment");
935
858
}
936
859
}
937
860
}
938
861
939
862
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
941
864
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
865
perror("pipe");
866
exitstatus = EXIT_FAILURE;
944
867
goto fallback;
945
868
}
946
869
/* Ask OS to automatic close the pipe on exec */
947
870
ret = set_cloexec_flag(pipefd[0]);
948
871
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
951
874
goto fallback;
952
875
}
953
876
ret = set_cloexec_flag(pipefd[1]);
954
877
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
957
880
goto fallback;
958
881
}
959
882
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
885
NULL));
963
886
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
966
889
goto fallback;
967
890
}
968
891
/* Starting a new process to be watched */
971
894
pid = fork();
972
895
} while(pid == -1 and errno == EINTR);
973
896
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
897
perror("fork");
898
exitstatus = EXIT_FAILURE;
976
899
goto fallback;
977
900
}
978
901
if(pid == 0){
979
902
/* this is the child process */
980
903
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
904
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
905
perror("sigaction");
906
_exit(EXIT_FAILURE);
984
907
}
985
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
909
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
910
perror("sigprocmask");
911
_exit(EXIT_FAILURE);
989
912
}
990
913
991
914
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
915
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
916
perror("dup2");
917
_exit(EXIT_FAILURE);
995
918
}
996
919
997
920
if(dirfd(dir) < 0){
1001
924
}
1002
925
if(p->environ[0] == NULL){
1003
926
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
927
perror("execv");
928
_exit(EXIT_FAILURE);
1006
929
}
1007
930
} else {
1008
931
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
932
perror("execve");
933
_exit(EXIT_FAILURE);
1011
934
}
1012
935
}
1013
936
/* no return */
1018
941
free(filename);
1019
942
plugin *new_plugin = getplugin(dirst->d_name);
1020
943
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
944
perror("getplugin");
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
947
NULL));
1025
948
if(ret < 0){
1026
error(0, errno, "sigprocmask");
949
perror("sigprocmask");
1027
950
}
1028
exitstatus = EX_OSERR;
951
exitstatus = EXIT_FAILURE;
1029
952
goto fallback;
1030
953
}
1031
954
1034
957
1035
958
/* Unblock SIGCHLD so signal handler can be run if this process
1036
959
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
1040
963
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
1043
966
goto fallback;
1044
967
}
1045
968
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
969
FD_SET(new_plugin->fd, &rfds_all);
1048
970
1049
971
if(maxfd < new_plugin->fd){
1050
972
maxfd = new_plugin->fd;
1071
993
fd_set rfds = rfds_all;
1072
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
995
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
996
perror("select");
997
exitstatus = EXIT_FAILURE;
1076
998
goto fallback;
1077
999
}
1078
1000
/* OK, now either a process completed, or something can be read
1104
1026
}
1105
1027
1106
1028
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1029
FD_CLR(proc->fd, &rfds_all);
1109
1030
1110
1031
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1034
NULL));
1115
1035
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1118
1038
goto fallback;
1119
1039
}
1120
1040
1123
1043
proc = next_plugin;
1124
1044
1125
1045
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1048
NULL));
1129
1049
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1132
1052
goto fallback;
1133
1053
}
1134
1054
1144
1064
bool bret = print_out_password(proc->buffer,
1145
1065
proc->buffer_length);
1146
1066
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1149
1069
}
1150
1070
goto fallback;
1151
1071
}
1152
1072
1153
1073
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
1075
/* This process had nothing to say at this time */
1158
1076
proc = proc->next;
1159
1077
continue;
1163
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
1082
+ (size_t) BUFFER_SIZE);
1165
1083
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
1084
perror("malloc");
1085
exitstatus = EXIT_FAILURE;
1168
1086
goto fallback;
1169
1087
}
1170
1088
proc->buffer_size += BUFFER_SIZE;
1191
1109
1192
1110
fallback:
1193
1111
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1196
1113
/* Fallback if all plugins failed, none are found or an error
1197
1114
occured */
1198
1115
bool bret;
1206
1123
}
1207
1124
bret = print_out_password(passwordbuffer, len);
1208
1125
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1211
1128
}
1212
1129
}
1213
1130
1214
1131
/* Restore old signal handler */
1215
1132
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
1133
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1219
1136
}
1220
1137
1221
1138
if(custom_argv != NULL){
1236
1153
ret = kill(p->pid, SIGTERM);
1237
1154
if(ret == -1 and errno != ESRCH){
1238
1155
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1156
perror("kill");
1240
1157
}
1241
1158
}
1242
1159
}
1246
1163
ret = wait(NULL);
1247
1164
} while(ret >= 0);
1248
1165
if(errno != ECHILD){
1249
error(0, errno, "wait");
1166
perror("wait");
1250
1167
}
1251
1168
1252
1169
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0