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- Committer: Teddy Hogeborn
- Date: 2009-11-03 00:12:35 UTC
- mto: (24.1.146 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-20091103001235-op9jfvtx6xvxch3h
* README (FAQ): Fix typo.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
42
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
45
46
readdir(), closedir(), dirfd() */
46
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
48
fcntl(), setuid(), setgid(),
52
53
close() */
53
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
55
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
65
67
SIG_UNBLOCK, kill(), sig_atomic_t
66
68
*/
67
69
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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 */
69
73
70
74
#define BUFFER_SIZE 256
71
75
82
86
char **environ;
83
87
int envc;
84
88
bool disabled;
85
89
86
90
/* Variables used for running processes*/
87
91
pid_t pid;
88
92
int fd;
100
104
/* Gets an existing plugin based on name,
101
105
or if none is found, creates a new one */
102
106
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
107
/* Check for existing plugin with that name */
104
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
109
if((p->name == name)
106
110
or (p->name and name and (strcmp(p->name, name) == 0))){
108
112
}
109
113
}
110
114
/* Create a new plugin */
111
plugin *new_plugin = malloc(sizeof(plugin));
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
112
119
if(new_plugin == NULL){
113
120
return NULL;
114
121
}
115
122
char *copy_name = NULL;
116
123
if(name != NULL){
117
copy_name = strdup(name);
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
118
127
if(copy_name == NULL){
128
int e = errno;
119
129
free(new_plugin);
130
errno = e;
120
131
return NULL;
121
132
}
122
133
}
126
137
.disabled = false,
127
138
.next = plugin_list };
128
139
129
new_plugin->argv = malloc(sizeof(char *) * 2);
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
130
143
if(new_plugin->argv == NULL){
144
int e = errno;
131
145
free(copy_name);
132
146
free(new_plugin);
147
errno = e;
133
148
return NULL;
134
149
}
135
150
new_plugin->argv[0] = copy_name;
136
151
new_plugin->argv[1] = NULL;
137
152
138
new_plugin->environ = malloc(sizeof(char *));
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
139
156
if(new_plugin->environ == NULL){
157
int e = errno;
140
158
free(copy_name);
141
159
free(new_plugin->argv);
142
160
free(new_plugin);
161
errno = e;
143
162
return NULL;
144
163
}
145
164
new_plugin->environ[0] = NULL;
153
172
static bool add_to_char_array(const char *new, char ***array,
154
173
int *len){
155
174
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
158
179
/* Malloc check */
159
180
if(*array == NULL){
160
181
return false;
161
182
}
162
183
/* Make a copy of the new string */
163
char *copy = strdup(new);
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
164
188
if(copy == NULL){
165
189
return false;
166
190
}
192
216
if(strncmp(*e, def, namelen + 1) == 0){
193
217
/* It already exists */
194
218
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
196
223
if(new == NULL){
197
224
return false;
198
225
}
208
235
/*
209
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
237
* Descriptor Flags".
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
212
239
*/
213
240
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
215
242
/* If reading the flags failed, return error indication now. */
216
243
if(ret < 0){
217
244
return ret;
218
245
}
219
246
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
221
249
}
222
250
223
251
280
308
}
281
309
free(plugin_node->environ);
282
310
free(plugin_node->buffer);
283
311
284
312
/* Removes the plugin from the singly-linked list */
285
313
if(plugin_node == plugin_list){
286
314
/* First one - simple */
313
341
struct dirent *dirst;
314
342
struct stat st;
315
343
fd_set rfds_all;
316
int ret, numchars, maxfd = 0;
344
int ret, maxfd = 0;
317
345
ssize_t sret;
318
intmax_t tmpmax;
319
346
uid_t uid = 65534;
320
347
gid_t gid = 65534;
321
348
bool debug = false;
331
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
359
if(ret == -1){
333
360
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
361
exitstatus = EX_OSERR;
335
362
goto fallback;
336
363
}
337
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
365
if(ret == -1){
339
366
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
367
exitstatus = EX_OSERR;
341
368
goto fallback;
342
369
}
343
370
375
402
.doc = "Group ID the plugins will run as", .group = 3 },
376
403
{ .name = "debug", .key = 132,
377
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
378
414
{ .name = NULL }
379
415
};
380
416
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
383
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
384
422
case 'g': /* --global-options */
385
if(arg != NULL){
423
{
386
424
char *plugin_option;
387
425
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
389
continue;
390
}
391
426
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
427
break;
394
428
}
395
429
}
396
430
}
397
431
break;
398
432
case 'G': /* --global-env */
399
if(arg == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
404
}
433
add_environment(getplugin(NULL), arg, true);
405
434
break;
406
435
case 'o': /* --options-for */
407
if(arg != NULL){
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
410
break;
411
}
412
char *plugin_option;
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
417
454
}
418
455
}
419
456
}
420
457
break;
421
458
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
425
459
{
426
460
char *envdef = strchr(arg, ':');
427
461
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
428
464
break;
429
465
}
430
466
*envdef = '\0';
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
433
472
}
473
add_environment(getplugin(arg), envdef, true);
434
474
}
435
475
break;
436
476
case 'd': /* --disable */
437
if(arg != NULL){
477
{
438
478
plugin *p = getplugin(arg);
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
479
if(p != NULL){
480
p->disabled = true;
441
481
}
442
p->disabled = true;
443
482
}
444
483
break;
445
484
case 'e': /* --enable */
446
if(arg != NULL){
485
{
447
486
plugin *p = getplugin(arg);
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
487
if(p != NULL){
488
p->disabled = false;
450
489
}
451
p->disabled = false;
452
490
}
453
491
break;
454
492
case 128: /* --plugin-dir */
455
493
free(plugindir);
456
494
plugindir = strdup(arg);
457
if(plugindir == NULL){
458
perror("strdup");
459
}
460
495
break;
461
496
case 129: /* --config-file */
462
497
/* This is already done by parse_opt_config_file() */
463
498
break;
464
499
case 130: /* --userid */
465
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
470
} else {
471
uid = (uid_t)tmpmax;
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
472
506
}
507
uid = (uid_t)tmpmax;
473
508
break;
474
509
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
480
} else {
481
gid = (gid_t)tmpmax;
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
482
516
}
517
gid = (gid_t)tmpmax;
483
518
break;
484
519
case 132: /* --debug */
485
520
debug = true;
486
521
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
487
536
/*
488
537
* When adding more options before this line, remember to also add a
489
538
* "case" to the "parse_opt_config_file" function below.
492
541
/* Cryptsetup always passes an argument, which is an empty
493
542
string if "none" was specified in /etc/crypttab. So if
494
543
argument was empty, we ignore it silently. */
495
if(arg[0] != '\0'){
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
544
if(arg[0] == '\0'){
545
break;
497
546
}
498
break;
499
case ARGP_KEY_END:
500
break;
501
547
default:
502
548
return ARGP_ERR_UNKNOWN;
503
549
}
504
return 0;
550
return errno; /* Set to 0 at start */
505
551
}
506
552
507
553
/* This option parser is the same as parse_opt() above, except it
509
555
error_t parse_opt_config_file(int key, char *arg,
510
556
__attribute__((unused))
511
557
struct argp_state *state){
558
errno = 0;
512
559
switch(key){
513
560
case 'g': /* --global-options */
514
561
case 'G': /* --global-env */
521
568
case 129: /* --config-file */
522
569
free(argfile);
523
570
argfile = strdup(arg);
524
if(argfile == NULL){
525
perror("strdup");
526
}
527
break;
571
break;
528
572
case 130: /* --userid */
529
573
case 131: /* --groupid */
530
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
531
578
case ARGP_KEY_ARG:
532
case ARGP_KEY_END:
533
579
break;
534
580
default:
535
581
return ARGP_ERR_UNKNOWN;
536
582
}
537
return 0;
583
return errno;
538
584
}
539
585
540
586
struct argp argp = { .options = options,
544
590
545
591
/* Parse using parse_opt_config_file() in order to get the custom
546
592
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
551
607
goto fallback;
552
608
}
553
609
559
615
conffp = fopen(AFILE, "r");
560
616
} else {
561
617
conffp = fopen(argfile, "r");
562
}
618
}
563
619
if(conffp != NULL){
564
620
char *org_line = NULL;
565
621
char *p, *arg, *new_arg, *line;
566
622
size_t size = 0;
567
623
const char whitespace_delims[] = " \r\t\f\v\n";
568
624
const char comment_delim[] = "#";
569
625
570
626
custom_argc = 1;
571
627
custom_argv = malloc(sizeof(char*) * 2);
572
628
if(custom_argv == NULL){
573
629
perror("malloc");
574
exitstatus = EXIT_FAILURE;
630
exitstatus = EX_OSERR;
575
631
goto fallback;
576
632
}
577
633
custom_argv[0] = argv[0];
578
634
custom_argv[1] = NULL;
579
635
580
636
/* for each line in the config file, strip whitespace and ignore
581
637
commented text */
582
638
while(true){
584
640
if(sret == -1){
585
641
break;
586
642
}
587
643
588
644
line = org_line;
589
645
arg = strsep(&line, comment_delim);
590
646
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
650
new_arg = strdup(p);
595
651
if(new_arg == NULL){
596
652
perror("strdup");
597
exitstatus = EXIT_FAILURE;
653
exitstatus = EX_OSERR;
598
654
free(org_line);
599
655
goto fallback;
600
656
}
604
660
* ((unsigned int) custom_argc + 1));
605
661
if(custom_argv == NULL){
606
662
perror("realloc");
607
exitstatus = EXIT_FAILURE;
663
exitstatus = EX_OSERR;
608
664
free(org_line);
609
665
goto fallback;
610
666
}
611
667
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
668
custom_argv[custom_argc] = NULL;
613
669
}
614
670
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
615
679
free(org_line);
616
680
} else {
617
681
/* Check for harmful errors and go to fallback. Other errors might
618
682
not affect opening plugins */
619
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
684
perror("fopen");
621
exitstatus = EXIT_FAILURE;
685
exitstatus = EX_IOERR;
622
686
goto fallback;
623
687
}
624
688
}
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
627
691
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
0, NULL);
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
633
706
goto fallback;
634
707
}
635
708
}
636
709
637
710
/* Parse actual command line arguments, to let them override the
638
711
config file */
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
643
726
goto fallback;
644
727
}
645
728
667
750
perror("setuid");
668
751
}
669
752
670
if(plugindir == NULL){
671
dir = opendir(PDIR);
672
} else {
673
dir = opendir(plugindir);
674
}
675
676
if(dir == NULL){
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
679
goto fallback;
680
}
681
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
/* Open plugin directory with close_on_exec flag */
683
754
{
684
int dir_fd = dirfd(dir);
685
if(dir_fd >= 0){
686
ret = set_cloexec_flag(dir_fd);
687
if(ret < 0){
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
690
goto fallback;
691
}
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
692
796
}
693
797
}
694
798
696
800
697
801
/* Read and execute any executable in the plugin directory*/
698
802
while(true){
699
dirst = readdir(dir);
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
700
806
701
807
/* All directory entries have been processed */
702
808
if(dirst == NULL){
703
809
if(errno == EBADF){
704
810
perror("readdir");
705
exitstatus = EXIT_FAILURE;
811
exitstatus = EX_IOERR;
706
812
goto fallback;
707
813
}
708
814
break;
753
859
continue;
754
860
}
755
861
}
756
862
757
863
char *filename;
758
864
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
760
867
} else {
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
762
871
}
763
872
if(ret < 0){
764
873
perror("asprintf");
765
874
continue;
766
875
}
767
876
768
ret = stat(filename, &st);
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
769
878
if(ret == -1){
770
879
perror("stat");
771
880
free(filename);
772
881
continue;
773
882
}
774
883
775
884
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
777
887
if(debug){
778
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
889
" with bad type or mode\n", filename);
825
935
}
826
936
827
937
int pipefd[2];
828
ret = pipe(pipefd);
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
829
939
if(ret == -1){
830
940
perror("pipe");
831
exitstatus = EXIT_FAILURE;
941
exitstatus = EX_OSERR;
832
942
goto fallback;
833
943
}
834
944
/* Ask OS to automatic close the pipe on exec */
835
945
ret = set_cloexec_flag(pipefd[0]);
836
946
if(ret < 0){
837
947
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
948
exitstatus = EX_OSERR;
839
949
goto fallback;
840
950
}
841
951
ret = set_cloexec_flag(pipefd[1]);
842
952
if(ret < 0){
843
953
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
954
exitstatus = EX_OSERR;
845
955
goto fallback;
846
956
}
847
957
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
849
961
if(ret < 0){
850
962
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
963
exitstatus = EX_OSERR;
852
964
goto fallback;
853
965
}
854
966
/* Starting a new process to be watched */
855
pid_t pid = fork();
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
856
971
if(pid == -1){
857
972
perror("fork");
858
exitstatus = EXIT_FAILURE;
973
exitstatus = EX_OSERR;
859
974
goto fallback;
860
975
}
861
976
if(pid == 0){
863
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
864
979
if(ret < 0){
865
980
perror("sigaction");
866
_exit(EXIT_FAILURE);
981
_exit(EX_OSERR);
867
982
}
868
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
984
if(ret < 0){
870
985
perror("sigprocmask");
871
_exit(EXIT_FAILURE);
986
_exit(EX_OSERR);
872
987
}
873
988
874
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
875
990
if(ret == -1){
876
991
perror("dup2");
877
_exit(EXIT_FAILURE);
992
_exit(EX_OSERR);
878
993
}
879
994
880
995
if(dirfd(dir) < 0){
885
1000
if(p->environ[0] == NULL){
886
1001
if(execv(filename, p->argv) < 0){
887
1002
perror("execv");
888
_exit(EXIT_FAILURE);
1003
_exit(EX_OSERR);
889
1004
}
890
1005
} else {
891
1006
if(execve(filename, p->argv, p->environ) < 0){
892
1007
perror("execve");
893
_exit(EXIT_FAILURE);
1008
_exit(EX_OSERR);
894
1009
}
895
1010
}
896
1011
/* no return */
897
1012
}
898
1013
/* Parent process */
899
close(pipefd[1]); /* Close unused write end of pipe */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
900
1016
free(filename);
901
1017
plugin *new_plugin = getplugin(dirst->d_name);
902
1018
if(new_plugin == NULL){
903
1019
perror("getplugin");
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
905
1023
if(ret < 0){
906
1024
perror("sigprocmask");
907
1025
}
908
exitstatus = EXIT_FAILURE;
1026
exitstatus = EX_OSERR;
909
1027
goto fallback;
910
1028
}
911
1029
914
1032
915
1033
/* Unblock SIGCHLD so signal handler can be run if this process
916
1034
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
918
1038
if(ret < 0){
919
1039
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
1040
exitstatus = EX_OSERR;
921
1041
goto fallback;
922
1042
}
923
1043
924
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
925
1046
926
1047
if(maxfd < new_plugin->fd){
927
1048
maxfd = new_plugin->fd;
928
1049
}
929
1050
}
930
1051
931
closedir(dir);
1052
TEMP_FAILURE_RETRY(closedir(dir));
932
1053
dir = NULL;
933
1054
free_plugin(getplugin(NULL));
934
1055
947
1068
while(plugin_list){
948
1069
fd_set rfds = rfds_all;
949
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
1071
if(select_ret == -1 and errno != EINTR){
951
1072
perror("select");
952
exitstatus = EXIT_FAILURE;
1073
exitstatus = EX_OSERR;
953
1074
goto fallback;
954
1075
}
955
1076
/* OK, now either a process completed, or something can be read
961
1082
if(not WIFEXITED(proc->status)
962
1083
or WEXITSTATUS(proc->status) != 0){
963
1084
/* Bad exit by plugin */
964
1085
965
1086
if(debug){
966
1087
if(WIFEXITED(proc->status)){
967
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
970
1091
WEXITSTATUS(proc->status));
971
1092
} else if(WIFSIGNALED(proc->status)){
972
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
1094
" signal %d: %s\n", proc->name,
974
1095
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
976
1098
} else if(WCOREDUMP(proc->status)){
977
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
1100
" core\n", proc->name, (intmax_t) (proc->pid));
980
1102
}
981
1103
982
1104
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
985
1108
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
987
1113
if(ret < 0){
988
1114
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1115
exitstatus = EX_OSERR;
990
1116
goto fallback;
991
1117
}
992
1118
995
1121
proc = next_plugin;
996
1122
997
1123
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
1000
1127
if(ret < 0){
1001
1128
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1129
exitstatus = EX_OSERR;
1003
1130
goto fallback;
1004
1131
}
1005
1132
1016
1143
proc->buffer_length);
1017
1144
if(not bret){
1018
1145
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1146
exitstatus = EX_IOERR;
1020
1147
}
1021
1148
goto fallback;
1022
1149
}
1023
1150
1024
1151
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1026
1155
/* This process had nothing to say at this time */
1027
1156
proc = proc->next;
1028
1157
continue;
1033
1162
+ (size_t) BUFFER_SIZE);
1034
1163
if(proc->buffer == NULL){
1035
1164
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1165
exitstatus = EX_OSERR;
1037
1166
goto fallback;
1038
1167
}
1039
1168
proc->buffer_size += BUFFER_SIZE;
1040
1169
}
1041
1170
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1044
1175
if(sret < 0){
1045
1176
/* Read error from this process; ignore the error */
1046
1177
proc = proc->next;
1054
1185
}
1055
1186
}
1056
1187
}
1057
1058
1188
1189
1059
1190
fallback:
1060
1191
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1062
1194
/* Fallback if all plugins failed, none are found or an error
1063
1195
occured */
1064
1196
bool bret;
1073
1205
bret = print_out_password(passwordbuffer, len);
1074
1206
if(not bret){
1075
1207
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1208
exitstatus = EX_IOERR;
1077
1209
}
1078
1210
}
1079
1211
1081
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1214
if(ret == -1){
1083
1215
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1216
exitstatus = EX_OSERR;
1085
1217
}
1086
1218
1087
1219
if(custom_argv != NULL){
1108
1240
}
1109
1241
1110
1242
/* Wait for any remaining child processes to terminate */
1111
do{
1243
do {
1112
1244
ret = wait(NULL);
1113
1245
} while(ret >= 0);
1114
1246
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0