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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 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 */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
68
72
69
73
#define BUFFER_SIZE 256
70
74
81
85
char **environ;
82
86
int envc;
83
87
bool disabled;
84
88
85
89
/* Variables used for running processes*/
86
90
pid_t pid;
87
91
int fd;
89
93
size_t buffer_size;
90
94
size_t buffer_length;
91
95
bool eof;
92
volatile bool completed;
93
volatile int status;
96
volatile sig_atomic_t completed;
97
int status;
94
98
struct plugin *next;
95
99
} plugin;
96
100
99
103
/* Gets an existing plugin based on name,
100
104
or if none is found, creates a new one */
101
105
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
106
/* Check for existing plugin with that name */
103
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
108
if((p->name == name)
105
109
or (p->name and name and (strcmp(p->name, name) == 0))){
107
111
}
108
112
}
109
113
/* Create a new plugin */
110
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);
111
118
if(new_plugin == NULL){
112
119
return NULL;
113
120
}
114
121
char *copy_name = NULL;
115
122
if(name != NULL){
116
copy_name = strdup(name);
123
do {
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
117
126
if(copy_name == NULL){
127
int e = errno;
128
free(new_plugin);
129
errno = e;
118
130
return NULL;
119
131
}
120
132
}
121
133
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
126
138
127
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);
128
142
if(new_plugin->argv == NULL){
143
int e = errno;
129
144
free(copy_name);
130
145
free(new_plugin);
146
errno = e;
131
147
return NULL;
132
148
}
133
149
new_plugin->argv[0] = copy_name;
134
150
new_plugin->argv[1] = NULL;
135
151
136
new_plugin->environ = malloc(sizeof(char *));
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
137
155
if(new_plugin->environ == NULL){
156
int e = errno;
138
157
free(copy_name);
139
158
free(new_plugin->argv);
140
159
free(new_plugin);
160
errno = e;
141
161
return NULL;
142
162
}
143
163
new_plugin->environ[0] = NULL;
151
171
static bool add_to_char_array(const char *new, char ***array,
152
172
int *len){
153
173
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
174
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
156
178
/* Malloc check */
157
179
if(*array == NULL){
158
180
return false;
159
181
}
160
182
/* Make a copy of the new string */
161
char *copy = strdup(new);
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
162
187
if(copy == NULL){
163
188
return false;
164
189
}
190
215
if(strncmp(*e, def, namelen + 1) == 0){
191
216
/* It already exists */
192
217
if(replace){
193
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);
194
222
if(new == NULL){
195
223
return false;
196
224
}
206
234
/*
207
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
236
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
238
*/
211
239
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
241
/* If reading the flags failed, return error indication now. */
214
242
if(ret < 0){
215
243
return ret;
216
244
}
217
245
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
219
248
}
220
249
221
250
222
251
/* Mark processes as completed when they exit, and save their exit
223
252
status. */
224
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
225
255
while(true){
226
256
plugin *proc = plugin_list;
227
257
int status;
231
261
break;
232
262
}
233
263
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
236
267
}
237
/* No child processes */
238
break;
268
perror("waitpid");
239
269
}
240
270
241
271
/* A child exited, find it in process_list */
247
277
continue;
248
278
}
249
279
proc->status = status;
250
proc->completed = true;
280
proc->completed = 1;
251
281
}
282
errno = old_errno;
252
283
}
253
284
254
285
/* Prints out a password to stdout */
276
307
}
277
308
free(plugin_node->environ);
278
309
free(plugin_node->buffer);
279
310
280
311
/* Removes the plugin from the singly-linked list */
281
312
if(plugin_node == plugin_list){
282
313
/* First one - simple */
309
340
struct dirent *dirst;
310
341
struct stat st;
311
342
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
343
int ret, maxfd = 0;
313
344
ssize_t sret;
314
intmax_t tmpmax;
315
345
uid_t uid = 65534;
316
346
gid_t gid = 65534;
317
347
bool debug = false;
371
401
.doc = "Group ID the plugins will run as", .group = 3 },
372
402
{ .name = "debug", .key = 132,
373
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 },
374
413
{ .name = NULL }
375
414
};
376
415
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
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;
380
421
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
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;
390
427
}
391
428
}
392
429
}
393
430
break;
394
431
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
432
add_environment(getplugin(NULL), arg, true);
401
433
break;
402
434
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
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;
420
453
}
421
454
}
422
455
}
423
456
break;
424
457
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
458
{
429
459
char *envdef = strchr(arg, ':');
430
460
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
431
463
break;
432
464
}
433
465
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
436
471
}
472
add_environment(getplugin(arg), envdef, true);
437
473
}
438
474
break;
439
475
case 'd': /* --disable */
440
if(arg != NULL){
476
{
441
477
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
478
if(p != NULL){
479
p->disabled = true;
444
480
}
445
p->disabled = true;
446
481
}
447
482
break;
448
483
case 'e': /* --enable */
449
if(arg != NULL){
484
{
450
485
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
486
if(p != NULL){
487
p->disabled = false;
453
488
}
454
p->disabled = false;
455
489
}
456
490
break;
457
491
case 128: /* --plugin-dir */
458
492
free(plugindir);
459
493
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
463
494
break;
464
495
case 129: /* --config-file */
465
496
/* This is already done by parse_opt_config_file() */
466
497
break;
467
498
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
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;
475
505
}
506
uid = (uid_t)tmpmax;
476
507
break;
477
508
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
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;
485
515
}
516
gid = (gid_t)tmpmax;
486
517
break;
487
518
case 132: /* --debug */
488
519
debug = true;
489
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;
490
535
/*
491
536
* When adding more options before this line, remember to also add a
492
537
* "case" to the "parse_opt_config_file" function below.
495
540
/* Cryptsetup always passes an argument, which is an empty
496
541
string if "none" was specified in /etc/crypttab. So if
497
542
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
543
if(arg[0] == '\0'){
544
break;
500
545
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
546
default:
505
547
return ARGP_ERR_UNKNOWN;
506
548
}
507
return 0;
549
return errno; /* Set to 0 at start */
508
550
}
509
551
510
552
/* This option parser is the same as parse_opt() above, except it
511
553
ignores everything but the --config-file option. */
512
554
error_t parse_opt_config_file(int key, char *arg,
513
555
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
516
559
case 'g': /* --global-options */
517
560
case 'G': /* --global-env */
518
561
case 'o': /* --options-for */
524
567
case 129: /* --config-file */
525
568
free(argfile);
526
569
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
570
break;
531
571
case 130: /* --userid */
532
572
case 131: /* --groupid */
533
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
534
577
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
578
break;
537
579
default:
538
580
return ARGP_ERR_UNKNOWN;
539
581
}
540
return 0;
582
return errno;
541
583
}
542
584
543
585
struct argp argp = { .options = options,
547
589
548
590
/* Parse using parse_opt_config_file() in order to get the custom
549
591
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
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;
554
606
goto fallback;
555
607
}
556
608
562
614
conffp = fopen(AFILE, "r");
563
615
} else {
564
616
conffp = fopen(argfile, "r");
565
}
617
}
566
618
if(conffp != NULL){
567
619
char *org_line = NULL;
568
620
char *p, *arg, *new_arg, *line;
569
621
size_t size = 0;
570
622
const char whitespace_delims[] = " \r\t\f\v\n";
571
623
const char comment_delim[] = "#";
572
624
573
625
custom_argc = 1;
574
626
custom_argv = malloc(sizeof(char*) * 2);
575
627
if(custom_argv == NULL){
579
631
}
580
632
custom_argv[0] = argv[0];
581
633
custom_argv[1] = NULL;
582
634
583
635
/* for each line in the config file, strip whitespace and ignore
584
636
commented text */
585
637
while(true){
587
639
if(sret == -1){
588
640
break;
589
641
}
590
642
591
643
line = org_line;
592
644
arg = strsep(&line, comment_delim);
593
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
612
664
goto fallback;
613
665
}
614
666
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
667
custom_argv[custom_argc] = NULL;
616
668
}
617
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
}
618
678
free(org_line);
619
679
} else {
620
680
/* Check for harmful errors and go to fallback. Other errors might
625
685
goto fallback;
626
686
}
627
687
}
628
/* If there was any arguments from configuration file,
629
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 */
630
690
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
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;
636
705
goto fallback;
637
706
}
638
707
}
639
708
640
709
/* Parse actual command line arguments, to let them override the
641
710
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
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;
646
725
goto fallback;
647
726
}
648
727
661
740
}
662
741
663
742
/* Strip permissions down to nobody */
743
setgid(gid);
744
if(ret == -1){
745
perror("setgid");
746
}
664
747
ret = setuid(uid);
665
748
if(ret == -1){
666
749
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
750
}
751
752
/* Open plugin directory with close_on_exec flag */
686
753
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
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;
695
795
}
696
796
}
697
797
699
799
700
800
/* Read and execute any executable in the plugin directory*/
701
801
while(true){
702
dirst = readdir(dir);
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
703
805
704
806
/* All directory entries have been processed */
705
807
if(dirst == NULL){
756
858
continue;
757
859
}
758
860
}
759
861
760
862
char *filename;
761
863
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
763
866
} else {
764
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));
765
870
}
766
871
if(ret < 0){
767
872
perror("asprintf");
768
873
continue;
769
874
}
770
875
771
ret = stat(filename, &st);
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
772
877
if(ret == -1){
773
878
perror("stat");
774
879
free(filename);
775
880
continue;
776
881
}
777
882
778
883
/* Ignore non-executable files */
779
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)){
780
886
if(debug){
781
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
888
" with bad type or mode\n", filename);
828
934
}
829
935
830
936
int pipefd[2];
831
ret = pipe(pipefd);
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
832
938
if(ret == -1){
833
939
perror("pipe");
834
940
exitstatus = EXIT_FAILURE;
848
954
goto fallback;
849
955
}
850
956
/* Block SIGCHLD until process is safely in process list */
851
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));
852
960
if(ret < 0){
853
961
perror("sigprocmask");
854
962
exitstatus = EXIT_FAILURE;
855
963
goto fallback;
856
964
}
857
965
/* Starting a new process to be watched */
858
pid_t pid = fork();
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
859
970
if(pid == -1){
860
971
perror("fork");
861
972
exitstatus = EXIT_FAILURE;
899
1010
/* no return */
900
1011
}
901
1012
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
903
1015
free(filename);
904
1016
plugin *new_plugin = getplugin(dirst->d_name);
905
1017
if(new_plugin == NULL){
906
1018
perror("getplugin");
907
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)));
908
1022
if(ret < 0){
909
1023
perror("sigprocmask");
910
1024
}
917
1031
918
1032
/* Unblock SIGCHLD so signal handler can be run if this process
919
1033
has already completed */
920
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));
921
1037
if(ret < 0){
922
1038
perror("sigprocmask");
923
1039
exitstatus = EXIT_FAILURE;
924
1040
goto fallback;
925
1041
}
926
1042
927
FD_SET(new_plugin->fd, &rfds_all);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
928
1045
929
1046
if(maxfd < new_plugin->fd){
930
1047
maxfd = new_plugin->fd;
931
1048
}
932
1049
}
933
1050
934
closedir(dir);
1051
TEMP_FAILURE_RETRY(closedir(dir));
935
1052
dir = NULL;
1053
free_plugin(getplugin(NULL));
936
1054
937
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1056
if(p->pid != 0){
949
1067
while(plugin_list){
950
1068
fd_set rfds = rfds_all;
951
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
953
1071
perror("select");
954
1072
exitstatus = EXIT_FAILURE;
955
1073
goto fallback;
958
1076
from one of them */
959
1077
for(plugin *proc = plugin_list; proc != NULL;){
960
1078
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
962
1080
/* Only accept the plugin output if it exited cleanly */
963
1081
if(not WIFEXITED(proc->status)
964
1082
or WEXITSTATUS(proc->status) != 0){
965
1083
/* Bad exit by plugin */
966
1084
967
1085
if(debug){
968
1086
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
971
1090
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
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)));
976
1097
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
979
1100
}
980
1101
}
981
1102
982
1103
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
984
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
985
1107
/* Block signal while modifying process_list */
986
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));
987
1112
if(ret < 0){
988
1113
perror("sigprocmask");
989
1114
exitstatus = EXIT_FAILURE;
995
1120
proc = next_plugin;
996
1121
997
1122
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
1000
1126
if(ret < 0){
1001
1127
perror("sigprocmask");
1002
1128
exitstatus = EXIT_FAILURE;
1022
1148
}
1023
1149
1024
1150
/* This process has not completed. Does it have any output? */
1025
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 */
1026
1154
/* This process had nothing to say at this time */
1027
1155
proc = proc->next;
1028
1156
continue;
1039
1167
proc->buffer_size += BUFFER_SIZE;
1040
1168
}
1041
1169
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1044
1174
if(sret < 0){
1045
1175
/* Read error from this process; ignore the error */
1046
1176
proc = proc->next;
1054
1184
}
1055
1185
}
1056
1186
}
1057
1058
1187
1188
1059
1189
fallback:
1060
1190
1061
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1108
1238
}
1109
1239
1110
1240
/* Wait for any remaining child processes to terminate */
1111
do{
1241
do {
1112
1242
ret = wait(NULL);
1113
1243
} while(ret >= 0);
1114
1244
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0