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- Committer: Teddy Hogeborn
- Date: 2009-10-26 21:16:16 UTC
- Revision ID: teddy@fukt.bsnet.se-20091026211616-38e9wynf4428ip2l
Merge from release branch.
- files added:
- debian/watch
- files renamed:
- mandos-list => mandos-ctl
- 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
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
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, 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,
62
64
#include <signal.h> /* struct sigaction, sigemptyset(),
63
65
sigaddset(), sigaction(),
64
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
66
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
67
72
68
73
#define BUFFER_SIZE 256
69
74
80
85
char **environ;
81
86
int envc;
82
87
bool disabled;
83
88
84
89
/* Variables used for running processes*/
85
90
pid_t pid;
86
91
int fd;
88
93
size_t buffer_size;
89
94
size_t buffer_length;
90
95
bool eof;
91
volatile bool completed;
92
volatile int status;
96
volatile sig_atomic_t completed;
97
int status;
93
98
struct plugin *next;
94
99
} plugin;
95
100
98
103
/* Gets an existing plugin based on name,
99
104
or if none is found, creates a new one */
100
105
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
106
/* Check for existing plugin with that name */
102
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
103
108
if((p->name == name)
104
109
or (p->name and name and (strcmp(p->name, name) == 0))){
106
111
}
107
112
}
108
113
/* Create a new plugin */
109
plugin *new_plugin = malloc(sizeof(plugin));
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
110
118
if(new_plugin == NULL){
111
119
return NULL;
112
120
}
113
121
char *copy_name = NULL;
114
122
if(name != NULL){
115
copy_name = strdup(name);
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
116
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
117
130
return NULL;
118
131
}
119
132
}
120
133
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
125
138
126
new_plugin->argv = malloc(sizeof(char *) * 2);
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
127
142
if(new_plugin->argv == NULL){
143
int e = errno;
128
144
free(copy_name);
129
145
free(new_plugin);
146
errno = e;
130
147
return NULL;
131
148
}
132
149
new_plugin->argv[0] = copy_name;
133
150
new_plugin->argv[1] = NULL;
134
151
135
new_plugin->environ = malloc(sizeof(char *));
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
136
155
if(new_plugin->environ == NULL){
156
int e = errno;
137
157
free(copy_name);
138
158
free(new_plugin->argv);
139
159
free(new_plugin);
160
errno = e;
140
161
return NULL;
141
162
}
142
163
new_plugin->environ[0] = NULL;
150
171
static bool add_to_char_array(const char *new, char ***array,
151
172
int *len){
152
173
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
155
178
/* Malloc check */
156
179
if(*array == NULL){
157
180
return false;
158
181
}
159
182
/* Make a copy of the new string */
160
char *copy = strdup(new);
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
161
187
if(copy == NULL){
162
188
return false;
163
189
}
189
215
if(strncmp(*e, def, namelen + 1) == 0){
190
216
/* It already exists */
191
217
if(replace){
192
char *new = realloc(*e, strlen(def) + 1);
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
193
222
if(new == NULL){
194
223
return false;
195
224
}
205
234
/*
206
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
236
* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
238
*/
210
239
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
241
/* If reading the flags failed, return error indication now. */
213
242
if(ret < 0){
214
243
return ret;
215
244
}
216
245
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
218
248
}
219
249
220
250
221
251
/* Mark processes as completed when they exit, and save their exit
222
252
status. */
223
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
224
255
while(true){
225
256
plugin *proc = plugin_list;
226
257
int status;
230
261
break;
231
262
}
232
263
if(pid == -1){
233
if(errno != ECHILD){
234
perror("waitpid");
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
235
267
}
236
/* No child processes */
237
break;
268
perror("waitpid");
238
269
}
239
270
240
271
/* A child exited, find it in process_list */
246
277
continue;
247
278
}
248
279
proc->status = status;
249
proc->completed = true;
280
proc->completed = 1;
250
281
}
282
errno = old_errno;
251
283
}
252
284
253
285
/* Prints out a password to stdout */
275
307
}
276
308
free(plugin_node->environ);
277
309
free(plugin_node->buffer);
278
310
279
311
/* Removes the plugin from the singly-linked list */
280
312
if(plugin_node == plugin_list){
281
313
/* First one - simple */
369
401
.doc = "Group ID the plugins will run as", .group = 3 },
370
402
{ .name = "debug", .key = 132,
371
403
.doc = "Debug mode", .group = 4 },
404
/*
405
* These reproduce what we would get without ARGP_NO_HELP
406
*/
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
372
413
{ .name = NULL }
373
414
};
374
415
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch(key) {
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
418
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
378
421
case 'g': /* --global-options */
379
if(arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
388
427
}
389
428
}
390
429
}
391
430
break;
392
431
case 'G': /* --global-env */
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
398
}
432
add_environment(getplugin(NULL), arg, true);
399
433
break;
400
434
case 'o': /* --options-for */
401
if(arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
435
{
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
439
errno = EINVAL;
440
break;
441
}
442
*option_list = '\0';
443
option_list++;
444
if(arg[0] == '\0'){
445
argp_error(state, "Empty plugin name");
446
errno = EINVAL;
447
break;
448
}
449
char *option;
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
452
break;
418
453
}
419
454
}
420
455
}
421
456
break;
422
457
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
426
458
{
427
459
char *envdef = strchr(arg, ':');
428
460
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
429
463
break;
430
464
}
431
465
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
434
471
}
472
add_environment(getplugin(arg), envdef, true);
435
473
}
436
474
break;
437
475
case 'd': /* --disable */
438
if(arg != NULL){
476
{
439
477
plugin *p = getplugin(arg);
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
478
if(p != NULL){
479
p->disabled = true;
442
480
}
443
p->disabled = true;
444
481
}
445
482
break;
446
483
case 'e': /* --enable */
447
if(arg != NULL){
484
{
448
485
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
486
if(p != NULL){
487
p->disabled = false;
451
488
}
452
p->disabled = false;
453
489
}
454
490
break;
455
491
case 128: /* --plugin-dir */
456
492
free(plugindir);
457
493
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
494
break;
462
495
case 129: /* --config-file */
463
496
/* This is already done by parse_opt_config_file() */
464
497
break;
465
498
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
504
break;
471
505
}
506
uid = (uid_t)tmpmax;
472
507
break;
473
508
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
514
break;
479
515
}
516
gid = (gid_t)tmpmax;
480
517
break;
481
518
case 132: /* --debug */
482
519
debug = true;
483
520
break;
521
/*
522
* These reproduce what we would get without ARGP_NO_HELP
523
*/
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
533
exit(EXIT_SUCCESS);
534
break;
484
535
/*
485
536
* When adding more options before this line, remember to also add a
486
537
* "case" to the "parse_opt_config_file" function below.
489
540
/* Cryptsetup always passes an argument, which is an empty
490
541
string if "none" was specified in /etc/crypttab. So if
491
542
argument was empty, we ignore it silently. */
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
543
if(arg[0] == '\0'){
544
break;
494
545
}
495
break;
496
case ARGP_KEY_END:
497
break;
498
546
default:
499
547
return ARGP_ERR_UNKNOWN;
500
548
}
501
return 0;
549
return errno; /* Set to 0 at start */
502
550
}
503
551
504
552
/* This option parser is the same as parse_opt() above, except it
505
553
ignores everything but the --config-file option. */
506
554
error_t parse_opt_config_file(int key, char *arg,
507
555
__attribute__((unused))
508
struct argp_state *state) {
509
switch(key) {
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
510
559
case 'g': /* --global-options */
511
560
case 'G': /* --global-env */
512
561
case 'o': /* --options-for */
518
567
case 129: /* --config-file */
519
568
free(argfile);
520
569
argfile = strdup(arg);
521
if(argfile == NULL){
522
perror("strdup");
523
}
524
break;
570
break;
525
571
case 130: /* --userid */
526
572
case 131: /* --groupid */
527
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
528
577
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
530
578
break;
531
579
default:
532
580
return ARGP_ERR_UNKNOWN;
533
581
}
534
return 0;
582
return errno;
535
583
}
536
584
537
585
struct argp argp = { .options = options,
541
589
542
590
/* Parse using parse_opt_config_file() in order to get the custom
543
591
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
594
NULL, NULL);
595
switch(ret){
596
case 0:
597
break;
598
case ENOMEM:
599
default:
600
errno = ret;
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
603
goto fallback;
604
case EINVAL:
605
exitstatus = EX_USAGE;
548
606
goto fallback;
549
607
}
550
608
556
614
conffp = fopen(AFILE, "r");
557
615
} else {
558
616
conffp = fopen(argfile, "r");
559
}
617
}
560
618
if(conffp != NULL){
561
619
char *org_line = NULL;
562
620
char *p, *arg, *new_arg, *line;
563
621
size_t size = 0;
564
622
const char whitespace_delims[] = " \r\t\f\v\n";
565
623
const char comment_delim[] = "#";
566
624
567
625
custom_argc = 1;
568
626
custom_argv = malloc(sizeof(char*) * 2);
569
627
if(custom_argv == NULL){
573
631
}
574
632
custom_argv[0] = argv[0];
575
633
custom_argv[1] = NULL;
576
634
577
635
/* for each line in the config file, strip whitespace and ignore
578
636
commented text */
579
637
while(true){
581
639
if(sret == -1){
582
640
break;
583
641
}
584
642
585
643
line = org_line;
586
644
arg = strsep(&line, comment_delim);
587
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
606
664
goto fallback;
607
665
}
608
666
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
610
668
}
611
669
}
670
do {
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
673
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
612
678
free(org_line);
613
679
} else {
614
680
/* Check for harmful errors and go to fallback. Other errors might
619
685
goto fallback;
620
686
}
621
687
}
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
624
690
if(custom_argv != NULL){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if(ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
693
NULL, NULL);
694
switch(ret){
695
case 0:
696
break;
697
case ENOMEM:
698
default:
699
errno = ret;
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
702
goto fallback;
703
case EINVAL:
704
exitstatus = EX_CONFIG;
630
705
goto fallback;
631
706
}
632
707
}
633
708
634
709
/* Parse actual command line arguments, to let them override the
635
710
config file */
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
713
NULL, NULL);
714
switch(ret){
715
case 0:
716
break;
717
case ENOMEM:
718
default:
719
errno = ret;
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
722
goto fallback;
723
case EINVAL:
724
exitstatus = EX_USAGE;
640
725
goto fallback;
641
726
}
642
727
647
732
for(char **a = p->argv; *a != NULL; a++){
648
733
fprintf(stderr, "\tArg: %s\n", *a);
649
734
}
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
651
736
for(char **a = p->environ; *a != NULL; a++){
652
737
fprintf(stderr, "\t%s\n", *a);
653
738
}
655
740
}
656
741
657
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
658
747
ret = setuid(uid);
659
748
if(ret == -1){
660
749
perror("setuid");
661
}
662
setgid(gid);
663
if(ret == -1){
664
perror("setgid");
665
}
666
667
if(plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
750
}
751
752
/* Open plugin directory with close_on_exec flag */
680
753
{
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
688
}
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
772
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
775
goto fallback;
776
}
777
778
#ifndef O_CLOEXEC
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
781
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
785
goto fallback;
786
}
787
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
689
795
}
690
796
}
691
797
693
799
694
800
/* Read and execute any executable in the plugin directory*/
695
801
while(true){
696
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
697
805
698
806
/* All directory entries have been processed */
699
807
if(dirst == NULL){
750
858
continue;
751
859
}
752
860
}
753
861
754
862
char *filename;
755
863
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
757
866
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
759
870
}
760
871
if(ret < 0){
761
872
perror("asprintf");
762
873
continue;
763
874
}
764
875
765
ret = stat(filename, &st);
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
766
877
if(ret == -1){
767
878
perror("stat");
768
879
free(filename);
769
880
continue;
770
881
}
771
882
772
883
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
774
886
if(debug){
775
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
888
" with bad type or mode\n", filename);
822
934
}
823
935
824
936
int pipefd[2];
825
ret = pipe(pipefd);
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
826
938
if(ret == -1){
827
939
perror("pipe");
828
940
exitstatus = EXIT_FAILURE;
842
954
goto fallback;
843
955
}
844
956
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
846
960
if(ret < 0){
847
961
perror("sigprocmask");
848
962
exitstatus = EXIT_FAILURE;
849
963
goto fallback;
850
964
}
851
965
/* Starting a new process to be watched */
852
pid_t pid = fork();
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
853
970
if(pid == -1){
854
971
perror("fork");
855
972
exitstatus = EXIT_FAILURE;
893
1010
/* no return */
894
1011
}
895
1012
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
897
1015
free(filename);
898
1016
plugin *new_plugin = getplugin(dirst->d_name);
899
1017
if(new_plugin == NULL){
900
1018
perror("getplugin");
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
902
1022
if(ret < 0){
903
1023
perror("sigprocmask");
904
1024
}
911
1031
912
1032
/* Unblock SIGCHLD so signal handler can be run if this process
913
1033
has already completed */
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
915
1037
if(ret < 0){
916
1038
perror("sigprocmask");
917
1039
exitstatus = EXIT_FAILURE;
918
1040
goto fallback;
919
1041
}
920
1042
921
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
922
1045
923
1046
if(maxfd < new_plugin->fd){
924
1047
maxfd = new_plugin->fd;
925
1048
}
926
1049
}
927
1050
928
closedir(dir);
1051
TEMP_FAILURE_RETRY(closedir(dir));
929
1052
dir = NULL;
1053
free_plugin(getplugin(NULL));
930
1054
931
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
932
1056
if(p->pid != 0){
943
1067
while(plugin_list){
944
1068
fd_set rfds = rfds_all;
945
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if(select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
947
1071
perror("select");
948
1072
exitstatus = EXIT_FAILURE;
949
1073
goto fallback;
952
1076
from one of them */
953
1077
for(plugin *proc = plugin_list; proc != NULL;){
954
1078
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
956
1080
/* Only accept the plugin output if it exited cleanly */
957
1081
if(not WIFEXITED(proc->status)
958
1082
or WEXITSTATUS(proc->status) != 0){
959
1083
/* Bad exit by plugin */
960
1084
961
1085
if(debug){
962
1086
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
965
1090
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
970
1097
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
973
1100
}
974
1101
}
975
1102
976
1103
/* Remove the plugin */
977
FD_CLR(proc->fd, &rfds_all);
978
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
979
1107
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
981
1112
if(ret < 0){
982
1113
perror("sigprocmask");
983
1114
exitstatus = EXIT_FAILURE;
989
1120
proc = next_plugin;
990
1121
991
1122
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
994
1126
if(ret < 0){
995
1127
perror("sigprocmask");
996
1128
exitstatus = EXIT_FAILURE;
1016
1148
}
1017
1149
1018
1150
/* This process has not completed. Does it have any output? */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1020
1154
/* This process had nothing to say at this time */
1021
1155
proc = proc->next;
1022
1156
continue;
1033
1167
proc->buffer_size += BUFFER_SIZE;
1034
1168
}
1035
1169
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1038
1174
if(sret < 0){
1039
1175
/* Read error from this process; ignore the error */
1040
1176
proc = proc->next;
1048
1184
}
1049
1185
}
1050
1186
}
1051
1052
1187
1188
1053
1189
fallback:
1054
1190
1055
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1102
1238
}
1103
1239
1104
1240
/* Wait for any remaining child processes to terminate */
1105
do{
1241
do {
1106
1242
ret = wait(NULL);
1107
1243
} while(ret >= 0);
1108
1244
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0