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- Committer: Björn Påhlsson
- Date: 2009-02-09 02:05:15 UTC
- mfrom: (304 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 306.
- Revision ID: belorn@braxen-20090209020515-t3s2syhptlm0doda
merge
- 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
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, 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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
72
68
73
69
#define BUFFER_SIZE 256
74
70
85
81
char **environ;
86
82
int envc;
87
83
bool disabled;
88
84
89
85
/* Variables used for running processes*/
90
86
pid_t pid;
91
87
int fd;
103
99
/* Gets an existing plugin based on name,
104
100
or if none is found, creates a new one */
105
101
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
107
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
104
if((p->name == name)
109
105
or (p->name and name and (strcmp(p->name, name) == 0))){
111
107
}
112
108
}
113
109
/* Create a new plugin */
114
plugin *new_plugin = NULL;
115
do {
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
118
111
if(new_plugin == NULL){
119
112
return NULL;
120
113
}
121
114
char *copy_name = NULL;
122
115
if(name != NULL){
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
126
117
if(copy_name == NULL){
127
int e = errno;
128
118
free(new_plugin);
129
errno = e;
130
119
return NULL;
131
120
}
132
121
}
136
125
.disabled = false,
137
126
.next = plugin_list };
138
127
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
142
129
if(new_plugin->argv == NULL){
143
int e = errno;
144
130
free(copy_name);
145
131
free(new_plugin);
146
errno = e;
147
132
return NULL;
148
133
}
149
134
new_plugin->argv[0] = copy_name;
150
135
new_plugin->argv[1] = NULL;
151
136
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
155
138
if(new_plugin->environ == NULL){
156
int e = errno;
157
139
free(copy_name);
158
140
free(new_plugin->argv);
159
141
free(new_plugin);
160
errno = e;
161
142
return NULL;
162
143
}
163
144
new_plugin->environ[0] = NULL;
171
152
static bool add_to_char_array(const char *new, char ***array,
172
153
int *len){
173
154
/* Resize the pointed-to array to hold one more pointer */
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
178
157
/* Malloc check */
179
158
if(*array == NULL){
180
159
return false;
181
160
}
182
161
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
187
163
if(copy == NULL){
188
164
return false;
189
165
}
215
191
if(strncmp(*e, def, namelen + 1) == 0){
216
192
/* It already exists */
217
193
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
222
195
if(new == NULL){
223
196
return false;
224
197
}
234
207
/*
235
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
209
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
211
*/
239
212
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
241
214
/* If reading the flags failed, return error indication now. */
242
215
if(ret < 0){
243
216
return ret;
244
217
}
245
218
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
220
}
249
221
250
222
307
279
}
308
280
free(plugin_node->environ);
309
281
free(plugin_node->buffer);
310
282
311
283
/* Removes the plugin from the singly-linked list */
312
284
if(plugin_node == plugin_list){
313
285
/* First one - simple */
340
312
struct dirent *dirst;
341
313
struct stat st;
342
314
fd_set rfds_all;
343
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
344
316
ssize_t sret;
317
intmax_t tmpmax;
345
318
uid_t uid = 65534;
346
319
gid_t gid = 65534;
347
320
bool debug = false;
401
374
.doc = "Group ID the plugins will run as", .group = 3 },
402
375
{ .name = "debug", .key = 132,
403
376
.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 },
413
377
{ .name = NULL }
414
378
};
415
379
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
418
382
switch(key){
419
char *tmp;
420
intmax_t tmpmax;
421
383
case 'g': /* --global-options */
422
{
423
char *plugin_option;
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
426
break;
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
427
393
}
428
394
}
429
395
}
430
396
break;
431
397
case 'G': /* --global-env */
432
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
}
433
404
break;
434
405
case 'o': /* --options-for */
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;
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
453
423
}
454
424
}
455
425
}
456
426
break;
457
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
458
431
{
459
432
char *envdef = strchr(arg, ':');
460
433
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
434
break;
464
435
}
465
436
*envdef = '\0';
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
471
439
}
472
add_environment(getplugin(arg), envdef, true);
473
440
}
474
441
break;
475
442
case 'd': /* --disable */
476
{
443
if(arg != NULL){
477
444
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
480
447
}
448
p->disabled = true;
481
449
}
482
450
break;
483
451
case 'e': /* --enable */
484
{
452
if(arg != NULL){
485
453
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
488
456
}
457
p->disabled = false;
489
458
}
490
459
break;
491
460
case 128: /* --plugin-dir */
492
461
free(plugindir);
493
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
494
466
break;
495
467
case 129: /* --config-file */
496
468
/* This is already done by parse_opt_config_file() */
497
469
break;
498
470
case 130: /* --userid */
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
505
478
}
506
uid = (uid_t)tmpmax;
507
479
break;
508
480
case 131: /* --groupid */
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;
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
515
488
}
516
gid = (gid_t)tmpmax;
517
489
break;
518
490
case 132: /* --debug */
519
491
debug = true;
520
492
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;
535
493
/*
536
494
* When adding more options before this line, remember to also add a
537
495
* "case" to the "parse_opt_config_file" function below.
540
498
/* Cryptsetup always passes an argument, which is an empty
541
499
string if "none" was specified in /etc/crypttab. So if
542
500
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
545
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
546
507
default:
547
508
return ARGP_ERR_UNKNOWN;
548
509
}
549
return errno; /* Set to 0 at start */
510
return 0;
550
511
}
551
512
552
513
/* This option parser is the same as parse_opt() above, except it
554
515
error_t parse_opt_config_file(int key, char *arg,
555
516
__attribute__((unused))
556
517
struct argp_state *state){
557
errno = 0;
558
518
switch(key){
559
519
case 'g': /* --global-options */
560
520
case 'G': /* --global-env */
567
527
case 129: /* --config-file */
568
528
free(argfile);
569
529
argfile = strdup(arg);
570
break;
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
571
534
case 130: /* --userid */
572
535
case 131: /* --groupid */
573
536
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
578
539
break;
579
540
default:
580
541
return ARGP_ERR_UNKNOWN;
581
542
}
582
return errno;
543
return 0;
583
544
}
584
545
585
546
struct argp argp = { .options = options,
589
550
590
551
/* Parse using parse_opt_config_file() in order to get the custom
591
552
config file location, if any. */
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;
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
606
557
goto fallback;
607
558
}
608
559
614
565
conffp = fopen(AFILE, "r");
615
566
} else {
616
567
conffp = fopen(argfile, "r");
617
}
568
}
618
569
if(conffp != NULL){
619
570
char *org_line = NULL;
620
571
char *p, *arg, *new_arg, *line;
621
572
size_t size = 0;
622
573
const char whitespace_delims[] = " \r\t\f\v\n";
623
574
const char comment_delim[] = "#";
624
575
625
576
custom_argc = 1;
626
577
custom_argv = malloc(sizeof(char*) * 2);
627
578
if(custom_argv == NULL){
631
582
}
632
583
custom_argv[0] = argv[0];
633
584
custom_argv[1] = NULL;
634
585
635
586
/* for each line in the config file, strip whitespace and ignore
636
587
commented text */
637
588
while(true){
639
590
if(sret == -1){
640
591
break;
641
592
}
642
593
643
594
line = org_line;
644
595
arg = strsep(&line, comment_delim);
645
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
615
goto fallback;
665
616
}
666
617
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
668
619
}
669
620
}
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
}
678
621
free(org_line);
679
622
} else {
680
623
/* Check for harmful errors and go to fallback. Other errors might
685
628
goto fallback;
686
629
}
687
630
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
690
633
if(custom_argv != NULL){
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;
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
705
639
goto fallback;
706
640
}
707
641
}
708
642
709
643
/* Parse actual command line arguments, to let them override the
710
644
config file */
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;
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
725
649
goto fallback;
726
650
}
727
651
749
673
perror("setuid");
750
674
}
751
675
752
/* Open plugin directory with close_on_exec flag */
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
753
689
{
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;
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
697
}
795
698
}
796
699
}
797
700
799
702
800
703
/* Read and execute any executable in the plugin directory*/
801
704
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
705
dirst = readdir(dir);
805
706
806
707
/* All directory entries have been processed */
807
708
if(dirst == NULL){
858
759
continue;
859
760
}
860
761
}
861
762
862
763
char *filename;
863
764
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
866
766
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
768
}
871
769
if(ret < 0){
872
770
perror("asprintf");
873
771
continue;
874
772
}
875
773
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
774
ret = stat(filename, &st);
877
775
if(ret == -1){
878
776
perror("stat");
879
777
free(filename);
880
778
continue;
881
779
}
882
780
883
781
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
783
if(debug){
887
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
785
" with bad type or mode\n", filename);
934
831
}
935
832
936
833
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
834
ret = pipe(pipefd);
938
835
if(ret == -1){
939
836
perror("pipe");
940
837
exitstatus = EXIT_FAILURE;
954
851
goto fallback;
955
852
}
956
853
/* Block SIGCHLD until process is safely in process list */
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
959
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
855
if(ret < 0){
961
856
perror("sigprocmask");
962
857
exitstatus = EXIT_FAILURE;
963
858
goto fallback;
964
859
}
965
860
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
970
862
if(pid == -1){
971
863
perror("fork");
972
864
exitstatus = EXIT_FAILURE;
1010
902
/* no return */
1011
903
}
1012
904
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
905
close(pipefd[1]); /* Close unused write end of pipe */
1015
906
free(filename);
1016
907
plugin *new_plugin = getplugin(dirst->d_name);
1017
908
if(new_plugin == NULL){
1018
909
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
911
if(ret < 0){
1023
912
perror("sigprocmask");
1024
913
}
1031
920
1032
921
/* Unblock SIGCHLD so signal handler can be run if this process
1033
922
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
924
if(ret < 0){
1038
925
perror("sigprocmask");
1039
926
exitstatus = EXIT_FAILURE;
1040
927
goto fallback;
1041
928
}
1042
929
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
930
FD_SET(new_plugin->fd, &rfds_all);
1045
931
1046
932
if(maxfd < new_plugin->fd){
1047
933
maxfd = new_plugin->fd;
1048
934
}
1049
935
}
1050
936
1051
TEMP_FAILURE_RETRY(closedir(dir));
937
closedir(dir);
1052
938
dir = NULL;
1053
939
free_plugin(getplugin(NULL));
1054
940
1067
953
while(plugin_list){
1068
954
fd_set rfds = rfds_all;
1069
955
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
956
if(select_ret == -1){
1071
957
perror("select");
1072
958
exitstatus = EXIT_FAILURE;
1073
959
goto fallback;
1081
967
if(not WIFEXITED(proc->status)
1082
968
or WEXITSTATUS(proc->status) != 0){
1083
969
/* Bad exit by plugin */
1084
970
1085
971
if(debug){
1086
972
if(WIFEXITED(proc->status)){
1087
973
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1090
976
WEXITSTATUS(proc->status));
1091
977
} else if(WIFSIGNALED(proc->status)){
1092
978
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
979
" signal %d\n", proc->name,
1094
980
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
981
WTERMSIG(proc->status));
1097
982
} else if(WCOREDUMP(proc->status)){
1098
983
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
984
" core\n", proc->name, (intmax_t) (proc->pid));
1101
986
}
1102
987
1103
988
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
989
FD_CLR(proc->fd, &rfds_all);
990
1107
991
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
992
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1112
993
if(ret < 0){
1113
994
perror("sigprocmask");
1114
995
exitstatus = EXIT_FAILURE;
1120
1001
proc = next_plugin;
1121
1002
1122
1003
/* We are done modifying process list, so unblock signal */
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
1004
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1005
NULL);
1126
1006
if(ret < 0){
1127
1007
perror("sigprocmask");
1128
1008
exitstatus = EXIT_FAILURE;
1148
1028
}
1149
1029
1150
1030
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1031
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1032
/* This process had nothing to say at this time */
1155
1033
proc = proc->next;
1156
1034
continue;
1167
1045
proc->buffer_size += BUFFER_SIZE;
1168
1046
}
1169
1047
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1048
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1049
BUFFER_SIZE);
1174
1050
if(sret < 0){
1175
1051
/* Read error from this process; ignore the error */
1176
1052
proc = proc->next;
1184
1060
}
1185
1061
}
1186
1062
}
1187
1188
1063
1064
1189
1065
fallback:
1190
1066
1191
1067
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1238
1114
}
1239
1115
1240
1116
/* Wait for any remaining child processes to terminate */
1241
do {
1117
do{
1242
1118
ret = wait(NULL);
1243
1119
} while(ret >= 0);
1244
1120
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0