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- Committer: Björn Påhlsson
- Date: 2009-01-16 23:19:44 UTC
- mfrom: (271 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 291.
- Revision ID: belorn@braxen-20090116231944-qw97sandjaohrywo
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;
93
89
size_t buffer_size;
94
90
size_t buffer_length;
95
91
bool eof;
96
volatile sig_atomic_t completed;
97
int status;
92
volatile bool completed;
93
volatile int status;
98
94
struct plugin *next;
99
95
} plugin;
100
96
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
free(new_plugin);
129
errno = e;
130
118
return NULL;
131
119
}
132
120
}
133
121
134
*new_plugin = (plugin){ .name = copy_name,
135
.argc = 1,
136
.disabled = false,
137
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
138
126
139
do {
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
127
new_plugin->argv = malloc(sizeof(char *) * 2);
142
128
if(new_plugin->argv == NULL){
143
int e = errno;
144
129
free(copy_name);
145
130
free(new_plugin);
146
errno = e;
147
131
return NULL;
148
132
}
149
133
new_plugin->argv[0] = copy_name;
150
134
new_plugin->argv[1] = NULL;
151
135
152
do {
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
155
137
if(new_plugin->environ == NULL){
156
int e = errno;
157
138
free(copy_name);
158
139
free(new_plugin->argv);
159
140
free(new_plugin);
160
errno = e;
161
141
return NULL;
162
142
}
163
143
new_plugin->environ[0] = NULL;
171
151
static bool add_to_char_array(const char *new, char ***array,
172
152
int *len){
173
153
/* 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);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
178
156
/* Malloc check */
179
157
if(*array == NULL){
180
158
return false;
181
159
}
182
160
/* Make a copy of the new string */
183
char *copy;
184
do {
185
copy = strdup(new);
186
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
187
162
if(copy == NULL){
188
163
return false;
189
164
}
215
190
if(strncmp(*e, def, namelen + 1) == 0){
216
191
/* It already exists */
217
192
if(replace){
218
char *new;
219
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def) + 1);
222
194
if(new == NULL){
223
195
return false;
224
196
}
234
206
/*
235
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
208
* Descriptor Flags".
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
238
210
*/
239
211
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
212
int ret = fcntl(fd, F_GETFD, 0);
241
213
/* If reading the flags failed, return error indication now. */
242
214
if(ret < 0){
243
215
return ret;
244
216
}
245
217
/* Store modified flag word in the descriptor. */
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
ret | FD_CLOEXEC));
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
248
219
}
249
220
250
221
251
222
/* Mark processes as completed when they exit, and save their exit
252
223
status. */
253
224
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
255
225
while(true){
256
226
plugin *proc = plugin_list;
257
227
int status;
261
231
break;
262
232
}
263
233
if(pid == -1){
264
if(errno == ECHILD){
265
/* No child processes */
266
break;
234
if(errno != ECHILD){
235
perror("waitpid");
267
236
}
268
perror("waitpid");
237
/* No child processes */
238
break;
269
239
}
270
240
271
241
/* A child exited, find it in process_list */
277
247
continue;
278
248
}
279
249
proc->status = status;
280
proc->completed = 1;
250
proc->completed = true;
281
251
}
282
errno = old_errno;
283
252
}
284
253
285
254
/* Prints out a password to stdout */
307
276
}
308
277
free(plugin_node->environ);
309
278
free(plugin_node->buffer);
310
279
311
280
/* Removes the plugin from the singly-linked list */
312
281
if(plugin_node == plugin_list){
313
282
/* First one - simple */
340
309
struct dirent *dirst;
341
310
struct stat st;
342
311
fd_set rfds_all;
343
int ret, maxfd = 0;
312
int ret, numchars, maxfd = 0;
344
313
ssize_t sret;
314
intmax_t tmpmax;
345
315
uid_t uid = 65534;
346
316
gid_t gid = 65534;
347
317
bool debug = false;
401
371
.doc = "Group ID the plugins will run as", .group = 3 },
402
372
{ .name = "debug", .key = 132,
403
373
.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
374
{ .name = NULL }
414
375
};
415
376
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;
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
421
380
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;
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;
427
390
}
428
391
}
429
392
}
430
393
break;
431
394
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
400
}
433
401
break;
434
402
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;
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;
453
420
}
454
421
}
455
422
}
456
423
break;
457
424
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
458
428
{
459
429
char *envdef = strchr(arg, ':');
460
430
if(envdef == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
431
break;
464
432
}
465
433
*envdef = '\0';
466
envdef++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
471
436
}
472
add_environment(getplugin(arg), envdef, true);
473
437
}
474
438
break;
475
439
case 'd': /* --disable */
476
{
440
if(arg != NULL){
477
441
plugin *p = getplugin(arg);
478
if(p != NULL){
479
p->disabled = true;
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
480
444
}
445
p->disabled = true;
481
446
}
482
447
break;
483
448
case 'e': /* --enable */
484
{
449
if(arg != NULL){
485
450
plugin *p = getplugin(arg);
486
if(p != NULL){
487
p->disabled = false;
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
488
453
}
454
p->disabled = false;
489
455
}
490
456
break;
491
457
case 128: /* --plugin-dir */
492
458
free(plugindir);
493
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
494
463
break;
495
464
case 129: /* --config-file */
496
465
/* This is already done by parse_opt_config_file() */
497
466
break;
498
467
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;
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;
505
475
}
506
uid = (uid_t)tmpmax;
507
476
break;
508
477
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;
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;
515
485
}
516
gid = (gid_t)tmpmax;
517
486
break;
518
487
case 132: /* --debug */
519
488
debug = true;
520
489
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
490
/*
536
491
* When adding more options before this line, remember to also add a
537
492
* "case" to the "parse_opt_config_file" function below.
540
495
/* Cryptsetup always passes an argument, which is an empty
541
496
string if "none" was specified in /etc/crypttab. So if
542
497
argument was empty, we ignore it silently. */
543
if(arg[0] == '\0'){
544
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
545
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
546
504
default:
547
505
return ARGP_ERR_UNKNOWN;
548
506
}
549
return errno; /* Set to 0 at start */
507
return 0;
550
508
}
551
509
552
510
/* This option parser is the same as parse_opt() above, except it
553
511
ignores everything but the --config-file option. */
554
512
error_t parse_opt_config_file(int key, char *arg,
555
513
__attribute__((unused))
556
struct argp_state *state){
557
errno = 0;
558
switch(key){
514
struct argp_state *state) {
515
switch(key) {
559
516
case 'g': /* --global-options */
560
517
case 'G': /* --global-env */
561
518
case 'o': /* --options-for */
567
524
case 129: /* --config-file */
568
525
free(argfile);
569
526
argfile = strdup(arg);
570
break;
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
571
531
case 130: /* --userid */
572
532
case 131: /* --groupid */
573
533
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
577
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
578
536
break;
579
537
default:
580
538
return ARGP_ERR_UNKNOWN;
581
539
}
582
return errno;
540
return 0;
583
541
}
584
542
585
543
struct argp argp = { .options = options,
589
547
590
548
/* Parse using parse_opt_config_file() in order to get the custom
591
549
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;
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;
606
554
goto fallback;
607
555
}
608
556
614
562
conffp = fopen(AFILE, "r");
615
563
} else {
616
564
conffp = fopen(argfile, "r");
617
}
565
}
618
566
if(conffp != NULL){
619
567
char *org_line = NULL;
620
568
char *p, *arg, *new_arg, *line;
621
569
size_t size = 0;
622
570
const char whitespace_delims[] = " \r\t\f\v\n";
623
571
const char comment_delim[] = "#";
624
572
625
573
custom_argc = 1;
626
574
custom_argv = malloc(sizeof(char*) * 2);
627
575
if(custom_argv == NULL){
631
579
}
632
580
custom_argv[0] = argv[0];
633
581
custom_argv[1] = NULL;
634
582
635
583
/* for each line in the config file, strip whitespace and ignore
636
584
commented text */
637
585
while(true){
639
587
if(sret == -1){
640
588
break;
641
589
}
642
590
643
591
line = org_line;
644
592
arg = strsep(&line, comment_delim);
645
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
664
612
goto fallback;
665
613
}
666
614
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
668
616
}
669
617
}
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
618
free(org_line);
679
619
} else {
680
620
/* Check for harmful errors and go to fallback. Other errors might
685
625
goto fallback;
686
626
}
687
627
}
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
690
630
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;
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;
705
636
goto fallback;
706
637
}
707
638
}
708
639
709
640
/* Parse actual command line arguments, to let them override the
710
641
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;
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;
725
646
goto fallback;
726
647
}
727
648
740
661
}
741
662
742
663
/* Strip permissions down to nobody */
664
ret = setuid(uid);
665
if(ret == -1){
666
perror("setuid");
667
}
743
668
setgid(gid);
744
669
if(ret == -1){
745
670
perror("setgid");
746
671
}
747
ret = setuid(uid);
748
if(ret == -1){
749
perror("setuid");
750
}
751
752
/* Open plugin directory with close_on_exec flag */
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 */
753
686
{
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;
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
}
795
695
}
796
696
}
797
697
799
699
800
700
/* Read and execute any executable in the plugin directory*/
801
701
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
805
703
806
704
/* All directory entries have been processed */
807
705
if(dirst == NULL){
858
756
continue;
859
757
}
860
758
}
861
759
862
760
char *filename;
863
761
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
866
763
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
765
}
871
766
if(ret < 0){
872
767
perror("asprintf");
873
768
continue;
874
769
}
875
770
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
877
772
if(ret == -1){
878
773
perror("stat");
879
774
free(filename);
880
775
continue;
881
776
}
882
777
883
778
/* Ignore non-executable files */
884
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
886
780
if(debug){
887
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
782
" with bad type or mode\n", filename);
934
828
}
935
829
936
830
int pipefd[2];
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
938
832
if(ret == -1){
939
833
perror("pipe");
940
834
exitstatus = EXIT_FAILURE;
954
848
goto fallback;
955
849
}
956
850
/* 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));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
852
if(ret < 0){
961
853
perror("sigprocmask");
962
854
exitstatus = EXIT_FAILURE;
963
855
goto fallback;
964
856
}
965
857
/* Starting a new process to be watched */
966
pid_t pid;
967
do {
968
pid = fork();
969
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
970
859
if(pid == -1){
971
860
perror("fork");
972
861
exitstatus = EXIT_FAILURE;
1010
899
/* no return */
1011
900
}
1012
901
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1015
903
free(filename);
1016
904
plugin *new_plugin = getplugin(dirst->d_name);
1017
905
if(new_plugin == NULL){
1018
906
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
NULL)));
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
908
if(ret < 0){
1023
909
perror("sigprocmask");
1024
910
}
1031
917
1032
918
/* Unblock SIGCHLD so signal handler can be run if this process
1033
919
has already completed */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
1036
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1037
921
if(ret < 0){
1038
922
perror("sigprocmask");
1039
923
exitstatus = EXIT_FAILURE;
1040
924
goto fallback;
1041
925
}
1042
926
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
927
FD_SET(new_plugin->fd, &rfds_all);
1045
928
1046
929
if(maxfd < new_plugin->fd){
1047
930
maxfd = new_plugin->fd;
1048
931
}
1049
932
}
1050
933
1051
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1052
935
dir = NULL;
1053
free_plugin(getplugin(NULL));
1054
936
1055
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
1056
938
if(p->pid != 0){
1067
949
while(plugin_list){
1068
950
fd_set rfds = rfds_all;
1069
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
if(select_ret == -1 and errno != EINTR){
952
if(select_ret == -1){
1071
953
perror("select");
1072
954
exitstatus = EXIT_FAILURE;
1073
955
goto fallback;
1076
958
from one of them */
1077
959
for(plugin *proc = plugin_list; proc != NULL;){
1078
960
/* Is this process completely done? */
1079
if(proc->completed and proc->eof){
961
if(proc->eof and proc->completed){
1080
962
/* Only accept the plugin output if it exited cleanly */
1081
963
if(not WIFEXITED(proc->status)
1082
964
or WEXITSTATUS(proc->status) != 0){
1083
965
/* Bad exit by plugin */
1084
966
1085
967
if(debug){
1086
968
if(WIFEXITED(proc->status)){
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1090
971
WEXITSTATUS(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)));
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));
1097
976
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1100
979
}
1101
980
}
1102
981
1103
982
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1106
983
FD_CLR(proc->fd, &rfds_all);
984
1107
985
/* Block signal while modifying process_list */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1109
(SIG_BLOCK,
1110
&sigchld_action.sa_mask,
1111
NULL));
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1112
987
if(ret < 0){
1113
988
perror("sigprocmask");
1114
989
exitstatus = EXIT_FAILURE;
1120
995
proc = next_plugin;
1121
996
1122
997
/* 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)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1126
1000
if(ret < 0){
1127
1001
perror("sigprocmask");
1128
1002
exitstatus = EXIT_FAILURE;
1148
1022
}
1149
1023
1150
1024
/* 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 */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1026
/* This process had nothing to say at this time */
1155
1027
proc = proc->next;
1156
1028
continue;
1167
1039
proc->buffer_size += BUFFER_SIZE;
1168
1040
}
1169
1041
/* Read from the process */
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1171
proc->buffer
1172
+ proc->buffer_length,
1173
BUFFER_SIZE));
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1174
1044
if(sret < 0){
1175
1045
/* Read error from this process; ignore the error */
1176
1046
proc = proc->next;
1184
1054
}
1185
1055
}
1186
1056
}
1187
1188
1057
1058
1189
1059
fallback:
1190
1060
1191
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1238
1108
}
1239
1109
1240
1110
/* Wait for any remaining child processes to terminate */
1241
do {
1111
do{
1242
1112
ret = wait(NULL);
1243
1113
} while(ret >= 0);
1244
1114
if(errno != ECHILD){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0