To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 24.1.135
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.135
- Committer: Björn Påhlsson
- Date: 2009-02-09 18:15:18 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 309.
- Revision ID: belorn@braxen-20090209181518-powtql91qv3wu51d
Earlier signal handling
- files modified:
- INSTALL
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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(), 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
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(),
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
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
73
68
74
69
#define BUFFER_SIZE 256
75
70
86
81
char **environ;
87
82
int envc;
88
83
bool disabled;
89
84
90
85
/* Variables used for running processes*/
91
86
pid_t pid;
92
87
int fd;
104
99
/* Gets an existing plugin based on name,
105
100
or if none is found, creates a new one */
106
101
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
108
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
104
if((p->name == name)
110
105
or (p->name and name and (strcmp(p->name, name) == 0))){
112
107
}
113
108
}
114
109
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
119
111
if(new_plugin == NULL){
120
112
return NULL;
121
113
}
122
114
char *copy_name = NULL;
123
115
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
127
117
if(copy_name == NULL){
128
int e = errno;
129
118
free(new_plugin);
130
errno = e;
131
119
return NULL;
132
120
}
133
121
}
137
125
.disabled = false,
138
126
.next = plugin_list };
139
127
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
143
129
if(new_plugin->argv == NULL){
144
int e = errno;
145
130
free(copy_name);
146
131
free(new_plugin);
147
errno = e;
148
132
return NULL;
149
133
}
150
134
new_plugin->argv[0] = copy_name;
151
135
new_plugin->argv[1] = NULL;
152
136
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
156
138
if(new_plugin->environ == NULL){
157
int e = errno;
158
139
free(copy_name);
159
140
free(new_plugin->argv);
160
141
free(new_plugin);
161
errno = e;
162
142
return NULL;
163
143
}
164
144
new_plugin->environ[0] = NULL;
172
152
static bool add_to_char_array(const char *new, char ***array,
173
153
int *len){
174
154
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
179
157
/* Malloc check */
180
158
if(*array == NULL){
181
159
return false;
182
160
}
183
161
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
188
163
if(copy == NULL){
189
164
return false;
190
165
}
216
191
if(strncmp(*e, def, namelen + 1) == 0){
217
192
/* It already exists */
218
193
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
223
195
if(new == NULL){
224
196
return false;
225
197
}
235
207
/*
236
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
209
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
211
*/
240
212
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
242
214
/* If reading the flags failed, return error indication now. */
243
215
if(ret < 0){
244
216
return ret;
245
217
}
246
218
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
220
}
250
221
251
222
308
279
}
309
280
free(plugin_node->environ);
310
281
free(plugin_node->buffer);
311
282
312
283
/* Removes the plugin from the singly-linked list */
313
284
if(plugin_node == plugin_list){
314
285
/* First one - simple */
341
312
struct dirent *dirst;
342
313
struct stat st;
343
314
fd_set rfds_all;
344
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
345
316
ssize_t sret;
317
intmax_t tmpmax;
346
318
uid_t uid = 65534;
347
319
gid_t gid = 65534;
348
320
bool debug = false;
358
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
331
if(ret == -1){
360
332
perror("sigaddset");
361
exitstatus = EX_OSERR;
333
exitstatus = EXIT_FAILURE;
362
334
goto fallback;
363
335
}
364
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
337
if(ret == -1){
366
338
perror("sigaction");
367
exitstatus = EX_OSERR;
339
exitstatus = EXIT_FAILURE;
368
340
goto fallback;
369
341
}
370
342
402
374
.doc = "Group ID the plugins will run as", .group = 3 },
403
375
{ .name = "debug", .key = 132,
404
376
.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 },
414
377
{ .name = NULL }
415
378
};
416
379
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
419
382
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
383
case 'g': /* --global-options */
423
{
384
if(arg != NULL){
424
385
char *plugin_option;
425
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
388
continue;
389
}
426
390
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
428
393
}
429
394
}
430
395
}
431
396
break;
432
397
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
434
404
break;
435
405
case 'o': /* --options-for */
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;
406
if(arg != NULL){
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
409
break;
410
}
411
char *plugin_option;
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
454
416
}
455
417
}
456
418
}
457
419
break;
458
420
case 'E': /* --env-for */
421
if(arg == NULL){
422
break;
423
}
459
424
{
460
425
char *envdef = strchr(arg, ':');
461
426
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
427
break;
465
428
}
466
429
*envdef = '\0';
467
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
472
432
}
473
add_environment(getplugin(arg), envdef, true);
474
433
}
475
434
break;
476
435
case 'd': /* --disable */
477
{
436
if(arg != NULL){
478
437
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
481
440
}
441
p->disabled = true;
482
442
}
483
443
break;
484
444
case 'e': /* --enable */
485
{
445
if(arg != NULL){
486
446
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
489
449
}
450
p->disabled = false;
490
451
}
491
452
break;
492
453
case 128: /* --plugin-dir */
493
454
free(plugindir);
494
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
495
459
break;
496
460
case 129: /* --config-file */
497
461
/* This is already done by parse_opt_config_file() */
498
462
break;
499
463
case 130: /* --userid */
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;
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
469
} else {
470
uid = (uid_t)tmpmax;
506
471
}
507
uid = (uid_t)tmpmax;
508
472
break;
509
473
case 131: /* --groupid */
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;
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
479
} else {
480
gid = (gid_t)tmpmax;
516
481
}
517
gid = (gid_t)tmpmax;
518
482
break;
519
483
case 132: /* --debug */
520
484
debug = true;
521
485
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;
536
486
/*
537
487
* When adding more options before this line, remember to also add a
538
488
* "case" to the "parse_opt_config_file" function below.
541
491
/* Cryptsetup always passes an argument, which is an empty
542
492
string if "none" was specified in /etc/crypttab. So if
543
493
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
494
if(arg[0] != '\0'){
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
546
496
}
497
break;
498
case ARGP_KEY_END:
499
break;
547
500
default:
548
501
return ARGP_ERR_UNKNOWN;
549
502
}
550
return errno; /* Set to 0 at start */
503
return 0;
551
504
}
552
505
553
506
/* This option parser is the same as parse_opt() above, except it
555
508
error_t parse_opt_config_file(int key, char *arg,
556
509
__attribute__((unused))
557
510
struct argp_state *state){
558
errno = 0;
559
511
switch(key){
560
512
case 'g': /* --global-options */
561
513
case 'G': /* --global-env */
568
520
case 129: /* --config-file */
569
521
free(argfile);
570
522
argfile = strdup(arg);
571
break;
523
if(argfile == NULL){
524
perror("strdup");
525
}
526
break;
572
527
case 130: /* --userid */
573
528
case 131: /* --groupid */
574
529
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
530
case ARGP_KEY_ARG:
531
case ARGP_KEY_END:
579
532
break;
580
533
default:
581
534
return ARGP_ERR_UNKNOWN;
582
535
}
583
return errno;
536
return 0;
584
537
}
585
538
586
539
struct argp argp = { .options = options,
590
543
591
544
/* Parse using parse_opt_config_file() in order to get the custom
592
545
config file location, if any. */
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;
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
548
fprintf(stderr, "Unknown error while parsing arguments\n");
549
exitstatus = EXIT_FAILURE;
607
550
goto fallback;
608
551
}
609
552
615
558
conffp = fopen(AFILE, "r");
616
559
} else {
617
560
conffp = fopen(argfile, "r");
618
}
561
}
619
562
if(conffp != NULL){
620
563
char *org_line = NULL;
621
564
char *p, *arg, *new_arg, *line;
622
565
size_t size = 0;
623
566
const char whitespace_delims[] = " \r\t\f\v\n";
624
567
const char comment_delim[] = "#";
625
568
626
569
custom_argc = 1;
627
570
custom_argv = malloc(sizeof(char*) * 2);
628
571
if(custom_argv == NULL){
629
572
perror("malloc");
630
exitstatus = EX_OSERR;
573
exitstatus = EXIT_FAILURE;
631
574
goto fallback;
632
575
}
633
576
custom_argv[0] = argv[0];
634
577
custom_argv[1] = NULL;
635
578
636
579
/* for each line in the config file, strip whitespace and ignore
637
580
commented text */
638
581
while(true){
640
583
if(sret == -1){
641
584
break;
642
585
}
643
586
644
587
line = org_line;
645
588
arg = strsep(&line, comment_delim);
646
589
while((p = strsep(&arg, whitespace_delims)) != NULL){
650
593
new_arg = strdup(p);
651
594
if(new_arg == NULL){
652
595
perror("strdup");
653
exitstatus = EX_OSERR;
596
exitstatus = EXIT_FAILURE;
654
597
free(org_line);
655
598
goto fallback;
656
599
}
660
603
* ((unsigned int) custom_argc + 1));
661
604
if(custom_argv == NULL){
662
605
perror("realloc");
663
exitstatus = EX_OSERR;
606
exitstatus = EXIT_FAILURE;
664
607
free(org_line);
665
608
goto fallback;
666
609
}
667
610
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
611
custom_argv[custom_argc] = NULL;
669
612
}
670
613
}
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
}
679
614
free(org_line);
680
615
} else {
681
616
/* Check for harmful errors and go to fallback. Other errors might
682
617
not affect opening plugins */
683
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
619
perror("fopen");
685
exitstatus = EX_OSERR;
620
exitstatus = EXIT_FAILURE;
686
621
goto fallback;
687
622
}
688
623
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
691
626
if(custom_argv != NULL){
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;
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
628
0, NULL);
629
if(ret == ARGP_ERR_UNKNOWN){
630
fprintf(stderr, "Unknown error while parsing arguments\n");
631
exitstatus = EXIT_FAILURE;
706
632
goto fallback;
707
633
}
708
634
}
709
635
710
636
/* Parse actual command line arguments, to let them override the
711
637
config file */
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;
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
726
642
goto fallback;
727
643
}
728
644
750
666
perror("setuid");
751
667
}
752
668
753
/* Open plugin directory with close_on_exec flag */
669
if(plugindir == NULL){
670
dir = opendir(PDIR);
671
} else {
672
dir = opendir(plugindir);
673
}
674
675
if(dir == NULL){
676
perror("Could not open plugin dir");
677
exitstatus = EXIT_FAILURE;
678
goto fallback;
679
}
680
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
682
{
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;
683
int dir_fd = dirfd(dir);
684
if(dir_fd >= 0){
685
ret = set_cloexec_flag(dir_fd);
686
if(ret < 0){
687
perror("set_cloexec_flag");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
796
691
}
797
692
}
798
693
800
695
801
696
/* Read and execute any executable in the plugin directory*/
802
697
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
698
dirst = readdir(dir);
806
699
807
700
/* All directory entries have been processed */
808
701
if(dirst == NULL){
809
702
if(errno == EBADF){
810
703
perror("readdir");
811
exitstatus = EX_IOERR;
704
exitstatus = EXIT_FAILURE;
812
705
goto fallback;
813
706
}
814
707
break;
859
752
continue;
860
753
}
861
754
}
862
755
863
756
char *filename;
864
757
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
759
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
871
761
}
872
762
if(ret < 0){
873
763
perror("asprintf");
874
764
continue;
875
765
}
876
766
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
767
ret = stat(filename, &st);
878
768
if(ret == -1){
879
769
perror("stat");
880
770
free(filename);
881
771
continue;
882
772
}
883
773
884
774
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
776
if(debug){
888
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
778
" with bad type or mode\n", filename);
935
824
}
936
825
937
826
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
827
ret = pipe(pipefd);
939
828
if(ret == -1){
940
829
perror("pipe");
941
exitstatus = EX_OSERR;
830
exitstatus = EXIT_FAILURE;
942
831
goto fallback;
943
832
}
944
833
/* Ask OS to automatic close the pipe on exec */
945
834
ret = set_cloexec_flag(pipefd[0]);
946
835
if(ret < 0){
947
836
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
837
exitstatus = EXIT_FAILURE;
949
838
goto fallback;
950
839
}
951
840
ret = set_cloexec_flag(pipefd[1]);
952
841
if(ret < 0){
953
842
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
843
exitstatus = EXIT_FAILURE;
955
844
goto fallback;
956
845
}
957
846
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
848
if(ret < 0){
962
849
perror("sigprocmask");
963
exitstatus = EX_OSERR;
850
exitstatus = EXIT_FAILURE;
964
851
goto fallback;
965
852
}
966
853
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
854
pid_t pid = fork();
971
855
if(pid == -1){
972
856
perror("fork");
973
exitstatus = EX_OSERR;
857
exitstatus = EXIT_FAILURE;
974
858
goto fallback;
975
859
}
976
860
if(pid == 0){
978
862
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
863
if(ret < 0){
980
864
perror("sigaction");
981
_exit(EX_OSERR);
865
_exit(EXIT_FAILURE);
982
866
}
983
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
868
if(ret < 0){
985
869
perror("sigprocmask");
986
_exit(EX_OSERR);
870
_exit(EXIT_FAILURE);
987
871
}
988
872
989
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
874
if(ret == -1){
991
875
perror("dup2");
992
_exit(EX_OSERR);
876
_exit(EXIT_FAILURE);
993
877
}
994
878
995
879
if(dirfd(dir) < 0){
1000
884
if(p->environ[0] == NULL){
1001
885
if(execv(filename, p->argv) < 0){
1002
886
perror("execv");
1003
_exit(EX_OSERR);
887
_exit(EXIT_FAILURE);
1004
888
}
1005
889
} else {
1006
890
if(execve(filename, p->argv, p->environ) < 0){
1007
891
perror("execve");
1008
_exit(EX_OSERR);
892
_exit(EXIT_FAILURE);
1009
893
}
1010
894
}
1011
895
/* no return */
1012
896
}
1013
897
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
898
close(pipefd[1]); /* Close unused write end of pipe */
1016
899
free(filename);
1017
900
plugin *new_plugin = getplugin(dirst->d_name);
1018
901
if(new_plugin == NULL){
1019
902
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
904
if(ret < 0){
1024
905
perror("sigprocmask");
1025
906
}
1026
exitstatus = EX_OSERR;
907
exitstatus = EXIT_FAILURE;
1027
908
goto fallback;
1028
909
}
1029
910
1032
913
1033
914
/* Unblock SIGCHLD so signal handler can be run if this process
1034
915
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
917
if(ret < 0){
1039
918
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
919
exitstatus = EXIT_FAILURE;
1041
920
goto fallback;
1042
921
}
1043
922
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
923
FD_SET(new_plugin->fd, &rfds_all);
1046
924
1047
925
if(maxfd < new_plugin->fd){
1048
926
maxfd = new_plugin->fd;
1049
927
}
1050
928
}
1051
929
1052
TEMP_FAILURE_RETRY(closedir(dir));
930
closedir(dir);
1053
931
dir = NULL;
1054
932
free_plugin(getplugin(NULL));
1055
933
1068
946
while(plugin_list){
1069
947
fd_set rfds = rfds_all;
1070
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
949
if(select_ret == -1){
1072
950
perror("select");
1073
exitstatus = EX_OSERR;
951
exitstatus = EXIT_FAILURE;
1074
952
goto fallback;
1075
953
}
1076
954
/* OK, now either a process completed, or something can be read
1082
960
if(not WIFEXITED(proc->status)
1083
961
or WEXITSTATUS(proc->status) != 0){
1084
962
/* Bad exit by plugin */
1085
963
1086
964
if(debug){
1087
965
if(WIFEXITED(proc->status)){
1088
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
969
WEXITSTATUS(proc->status));
1092
970
} else if(WIFSIGNALED(proc->status)){
1093
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
972
" signal %d\n", proc->name,
1095
973
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(proc->status)));
974
WTERMSIG(proc->status));
1098
975
} else if(WCOREDUMP(proc->status)){
1099
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
977
" core\n", proc->name, (intmax_t) (proc->pid));
1102
979
}
1103
980
1104
981
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
982
FD_CLR(proc->fd, &rfds_all);
983
1108
984
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
986
if(ret < 0){
1114
987
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
988
exitstatus = EXIT_FAILURE;
1116
989
goto fallback;
1117
990
}
1118
991
1121
994
proc = next_plugin;
1122
995
1123
996
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
998
NULL);
1127
999
if(ret < 0){
1128
1000
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1001
exitstatus = EXIT_FAILURE;
1130
1002
goto fallback;
1131
1003
}
1132
1004
1143
1015
proc->buffer_length);
1144
1016
if(not bret){
1145
1017
perror("print_out_password");
1146
exitstatus = EX_IOERR;
1018
exitstatus = EXIT_FAILURE;
1147
1019
}
1148
1020
goto fallback;
1149
1021
}
1150
1022
1151
1023
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1025
/* This process had nothing to say at this time */
1156
1026
proc = proc->next;
1157
1027
continue;
1162
1032
+ (size_t) BUFFER_SIZE);
1163
1033
if(proc->buffer == NULL){
1164
1034
perror("malloc");
1165
exitstatus = EX_OSERR;
1035
exitstatus = EXIT_FAILURE;
1166
1036
goto fallback;
1167
1037
}
1168
1038
proc->buffer_size += BUFFER_SIZE;
1169
1039
}
1170
1040
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1042
BUFFER_SIZE);
1175
1043
if(sret < 0){
1176
1044
/* Read error from this process; ignore the error */
1177
1045
proc = proc->next;
1185
1053
}
1186
1054
}
1187
1055
}
1188
1189
1056
1057
1190
1058
fallback:
1191
1059
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1194
1061
/* Fallback if all plugins failed, none are found or an error
1195
1062
occured */
1196
1063
bool bret;
1205
1072
bret = print_out_password(passwordbuffer, len);
1206
1073
if(not bret){
1207
1074
perror("print_out_password");
1208
exitstatus = EX_IOERR;
1075
exitstatus = EXIT_FAILURE;
1209
1076
}
1210
1077
}
1211
1078
1213
1080
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1081
if(ret == -1){
1215
1082
perror("sigaction");
1216
exitstatus = EX_OSERR;
1083
exitstatus = EXIT_FAILURE;
1217
1084
}
1218
1085
1219
1086
if(custom_argv != NULL){
1240
1107
}
1241
1108
1242
1109
/* Wait for any remaining child processes to terminate */
1243
do {
1110
do{
1244
1111
ret = wait(NULL);
1245
1112
} while(ret >= 0);
1246
1113
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0