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- Committer: Teddy Hogeborn
- Date: 2008-09-13 15:36:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913153618-atp386q2bqj0ku99
* Makefile (install-client-nokey): Do "&&" instead of ";" to catch
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
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
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
105
98
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
101
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
106
return p;
115
107
}
116
108
}
117
109
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
123
112
return NULL;
124
113
}
125
114
char *copy_name = NULL;
126
115
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
130
117
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
118
return NULL;
135
119
}
136
120
}
137
121
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
142
126
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
148
129
free(copy_name);
149
130
free(new_plugin);
150
errno = e;
151
131
return NULL;
152
132
}
153
133
new_plugin->argv[0] = copy_name;
154
134
new_plugin->argv[1] = NULL;
155
135
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
159
137
if(new_plugin->environ == NULL){
160
int e = errno;
161
138
free(copy_name);
162
139
free(new_plugin->argv);
163
140
free(new_plugin);
164
errno = e;
165
141
return NULL;
166
142
}
167
143
new_plugin->environ[0] = NULL;
172
148
}
173
149
174
150
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
151
static bool add_to_char_array(const char *new, char ***array,
177
152
int *len){
178
153
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
184
156
/* Malloc check */
185
if(new_array == NULL){
157
if(*array == NULL){
186
158
return false;
187
159
}
188
*array = new_array;
189
160
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
194
162
if(copy == NULL){
195
163
return false;
196
164
}
203
171
}
204
172
205
173
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
174
static bool add_argument(plugin *p, const char *arg){
208
175
if(p == NULL){
209
176
return false;
212
179
}
213
180
214
181
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
182
static bool add_environment(plugin *p, const char *def, bool replace){
217
183
if(p == NULL){
218
184
return false;
220
186
/* namelen = length of name of environment variable */
221
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
188
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
225
191
/* It already exists */
226
192
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
232
195
return false;
233
196
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
236
199
}
237
200
return true;
238
201
}
243
206
/*
244
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
245
208
* Descriptor Flags".
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
210
*/
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
251
214
/* If reading the flags failed, return error indication now. */
252
215
if(ret < 0){
253
216
return ret;
254
217
}
255
218
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
220
}
259
221
260
222
261
223
/* Mark processes as completed when they exit, and save their exit
262
224
status. */
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
265
226
while(true){
266
227
plugin *proc = plugin_list;
267
228
int status;
271
232
break;
272
233
}
273
234
if(pid == -1){
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
235
if (errno != ECHILD){
236
perror("waitpid");
277
237
}
278
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
279
240
}
280
241
281
242
/* A child exited, find it in process_list */
287
248
continue;
288
249
}
289
250
proc->status = status;
290
proc->completed = 1;
251
proc->completed = true;
291
252
}
292
errno = old_errno;
293
253
}
294
254
295
255
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
298
257
ssize_t ret;
299
258
for(size_t written = 0; written < length; written += (size_t)ret){
300
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
307
266
}
308
267
309
268
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
269
static void free_plugin(plugin *plugin_node){
312
270
313
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
319
277
}
320
278
free(plugin_node->environ);
321
279
free(plugin_node->buffer);
322
280
323
281
/* Removes the plugin from the singly-linked list */
324
282
if(plugin_node == plugin_list){
325
283
/* First one - simple */
353
311
struct stat st;
354
312
fd_set rfds_all;
355
313
int ret, maxfd = 0;
356
ssize_t sret;
357
314
uid_t uid = 65534;
358
315
gid_t gid = 65534;
359
316
bool debug = false;
368
325
sigemptyset(&sigchld_action.sa_mask);
369
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
370
327
if(ret == -1){
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
373
330
goto fallback;
374
331
}
375
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
376
333
if(ret == -1){
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
379
336
goto fallback;
380
337
}
381
338
413
370
.doc = "Group ID the plugins will run as", .group = 3 },
414
371
{ .name = "debug", .key = 132,
415
372
.doc = "Debug mode", .group = 4 },
416
/*
417
* These reproduce what we would get without ARGP_NO_HELP
418
*/
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
425
373
{ .name = NULL }
426
374
};
427
375
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
errno = 0;
431
switch(key){
432
char *tmp;
433
intmax_t tmp_id;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
434
379
case 'g': /* --global-options */
435
{
436
char *plugin_option;
437
while((plugin_option = strsep(&arg, ",")) != NULL){
438
if(not add_argument(getplugin(NULL), plugin_option)){
439
break;
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
440
389
}
441
390
}
442
errno = 0;
443
391
}
444
392
break;
445
393
case 'G': /* --global-env */
446
if(add_environment(getplugin(NULL), arg, true)){
447
errno = 0;
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
448
399
}
449
400
break;
450
401
case 'o': /* --options-for */
451
{
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
455
errno = EINVAL;
456
break;
457
}
458
*option_list = '\0';
459
option_list++;
460
if(arg[0] == '\0'){
461
argp_error(state, "Empty plugin name");
462
errno = EINVAL;
463
break;
464
}
465
char *option;
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
468
break;
469
}
470
}
471
errno = 0;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
472
421
}
473
422
break;
474
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
475
427
{
476
428
char *envdef = strchr(arg, ':');
477
429
if(envdef == NULL){
478
argp_error(state, "No colon in \"%s\"", arg);
479
errno = EINVAL;
480
430
break;
481
431
}
482
432
*envdef = '\0';
483
envdef++;
484
if(arg[0] == '\0'){
485
argp_error(state, "Empty plugin name");
486
errno = EINVAL;
487
break;
488
}
489
if(add_environment(getplugin(arg), envdef, true)){
490
errno = 0;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
491
435
}
492
436
}
493
437
break;
494
438
case 'd': /* --disable */
495
{
439
if (arg != NULL){
496
440
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = true;
499
errno = 0;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
500
443
}
444
p->disabled = true;
501
445
}
502
446
break;
503
447
case 'e': /* --enable */
504
{
448
if (arg != NULL){
505
449
plugin *p = getplugin(arg);
506
if(p != NULL){
507
p->disabled = false;
508
errno = 0;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
509
452
}
453
p->disabled = false;
510
454
}
511
455
break;
512
456
case 128: /* --plugin-dir */
513
457
free(plugindir);
514
458
plugindir = strdup(arg);
515
if(plugindir != NULL){
516
errno = 0;
517
}
459
if(plugindir == NULL){
460
perror("strdup");
461
}
518
462
break;
519
463
case 129: /* --config-file */
520
464
/* This is already done by parse_opt_config_file() */
521
465
break;
522
466
case 130: /* --userid */
523
tmp_id = strtoimax(arg, &tmp, 10);
524
if(errno != 0 or tmp == arg or *tmp != '\0'
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
528
break;
529
}
530
uid = (uid_t)tmp_id;
531
errno = 0;
467
uid = (uid_t)strtol(arg, NULL, 10);
532
468
break;
533
469
case 131: /* --groupid */
534
tmp_id = strtoimax(arg, &tmp, 10);
535
if(errno != 0 or tmp == arg or *tmp != '\0'
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
539
break;
540
}
541
gid = (gid_t)tmp_id;
542
errno = 0;
470
gid = (gid_t)strtol(arg, NULL, 10);
543
471
break;
544
472
case 132: /* --debug */
545
473
debug = true;
546
474
break;
547
/*
548
* These reproduce what we would get without ARGP_NO_HELP
549
*/
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
559
exit(EXIT_SUCCESS);
560
break;
561
/*
562
* When adding more options before this line, remember to also add a
563
* "case" to the "parse_opt_config_file" function below.
564
*/
565
475
case ARGP_KEY_ARG:
566
476
/* Cryptsetup always passes an argument, which is an empty
567
477
string if "none" was specified in /etc/crypttab. So if
568
478
argument was empty, we ignore it silently. */
569
if(arg[0] == '\0'){
570
break;
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
571
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
572
485
default:
573
486
return ARGP_ERR_UNKNOWN;
574
487
}
575
return errno; /* Set to 0 at start */
488
return 0;
576
489
}
577
490
578
491
/* This option parser is the same as parse_opt() above, except it
579
492
ignores everything but the --config-file option. */
580
error_t parse_opt_config_file(int key, char *arg,
581
__attribute__((unused))
582
struct argp_state *state){
583
errno = 0;
584
switch(key){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
585
497
case 'g': /* --global-options */
586
498
case 'G': /* --global-env */
587
499
case 'o': /* --options-for */
593
505
case 129: /* --config-file */
594
506
free(argfile);
595
507
argfile = strdup(arg);
596
if(argfile != NULL){
597
errno = 0;
508
if(argfile == NULL){
509
perror("strdup");
598
510
}
599
break;
511
break;
600
512
case 130: /* --userid */
601
513
case 131: /* --groupid */
602
514
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
606
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
607
517
break;
608
518
default:
609
519
return ARGP_ERR_UNKNOWN;
610
520
}
611
return errno;
521
return 0;
612
522
}
613
523
614
524
struct argp argp = { .options = options,
616
526
.args_doc = "",
617
527
.doc = "Mandos plugin runner -- Run plugins" };
618
528
619
/* Parse using parse_opt_config_file() in order to get the custom
529
/* Parse using the parse_opt_config_file in order to get the custom
620
530
config file location, if any. */
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
623
NULL, NULL);
624
switch(ret){
625
case 0:
626
break;
627
case ENOMEM:
628
default:
629
errno = ret;
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
632
goto fallback;
633
case EINVAL:
634
exitstatus = EX_USAGE;
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
532
if (ret == ARGP_ERR_UNKNOWN){
533
fprintf(stderr, "Unknown error while parsing arguments\n");
534
exitstatus = EXIT_FAILURE;
635
535
goto fallback;
636
536
}
637
537
639
539
argp.parser = parse_opt;
640
540
641
541
/* Open the configfile if available */
642
if(argfile == NULL){
542
if (argfile == NULL){
643
543
conffp = fopen(AFILE, "r");
644
544
} else {
645
545
conffp = fopen(argfile, "r");
646
}
546
}
647
547
if(conffp != NULL){
648
548
char *org_line = NULL;
649
549
char *p, *arg, *new_arg, *line;
650
550
size_t size = 0;
551
ssize_t sret;
651
552
const char whitespace_delims[] = " \r\t\f\v\n";
652
553
const char comment_delim[] = "#";
653
554
654
555
custom_argc = 1;
655
556
custom_argv = malloc(sizeof(char*) * 2);
656
557
if(custom_argv == NULL){
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
659
560
goto fallback;
660
561
}
661
562
custom_argv[0] = argv[0];
662
563
custom_argv[1] = NULL;
663
564
664
565
/* for each line in the config file, strip whitespace and ignore
665
566
commented text */
666
567
while(true){
668
569
if(sret == -1){
669
570
break;
670
571
}
671
572
672
573
line = org_line;
673
574
arg = strsep(&line, comment_delim);
674
575
while((p = strsep(&arg, whitespace_delims)) != NULL){
677
578
}
678
579
new_arg = strdup(p);
679
580
if(new_arg == NULL){
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
682
583
free(org_line);
683
584
goto fallback;
684
585
}
685
586
686
587
custom_argc += 1;
687
{
688
char **new_argv = realloc(custom_argv, sizeof(char *)
689
* ((unsigned int)
690
custom_argc + 1));
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
694
free(new_arg);
695
free(org_line);
696
goto fallback;
697
} else {
698
custom_argv = new_argv;
699
}
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
700
595
}
701
596
custom_argv[custom_argc-1] = new_arg;
702
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
703
598
}
704
599
}
705
do {
706
ret = fclose(conffp);
707
} while(ret == EOF and errno == EINTR);
708
if(ret == EOF){
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
711
goto fallback;
712
}
713
600
free(org_line);
714
601
} else {
715
602
/* Check for harmful errors and go to fallback. Other errors might
716
603
not affect opening plugins */
717
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
perror("fopen");
606
exitstatus = EXIT_FAILURE;
720
607
goto fallback;
721
608
}
722
609
}
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
725
612
if(custom_argv != NULL){
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
728
NULL, NULL);
729
switch(ret){
730
case 0:
731
break;
732
case ENOMEM:
733
default:
734
errno = ret;
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
737
goto fallback;
738
case EINVAL:
739
exitstatus = EX_CONFIG;
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
740
618
goto fallback;
741
619
}
742
620
}
743
621
744
622
/* Parse actual command line arguments, to let them override the
745
623
config file */
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
NULL, NULL);
749
switch(ret){
750
case 0:
751
break;
752
case ENOMEM:
753
default:
754
errno = ret;
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
757
goto fallback;
758
case EINVAL:
759
exitstatus = EX_USAGE;
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
760
628
goto fallback;
761
629
}
762
630
767
635
for(char **a = p->argv; *a != NULL; a++){
768
636
fprintf(stderr, "\tArg: %s\n", *a);
769
637
}
770
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
639
for(char **a = p->environ; *a != NULL; a++){
772
640
fprintf(stderr, "\t%s\n", *a);
773
641
}
774
642
}
775
643
}
776
644
777
if(getuid() == 0){
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open");
783
} else {
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
785
if(ret == -1){
786
error(0, errno, "fstat");
787
} else {
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
790
if(ret == -1){
791
error(0, errno, "fchown");
792
}
793
}
794
}
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
796
}
797
}
798
799
/* Lower permissions */
800
ret = setgid(gid);
801
if(ret == -1){
802
error(0, errno, "setgid");
803
}
645
/* Strip permissions down to nobody */
804
646
ret = setuid(uid);
805
if(ret == -1){
806
error(0, errno, "setuid");
807
}
808
809
/* Open plugin directory with close_on_exec flag */
647
if (ret == -1){
648
perror("setuid");
649
}
650
setgid(gid);
651
if (ret == -1){
652
perror("setgid");
653
}
654
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
661
if(dir == NULL){
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
664
goto fallback;
665
}
666
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
810
668
{
811
int dir_fd = -1;
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
814
#ifdef O_CLOEXEC
815
O_CLOEXEC
816
#else /* not O_CLOEXEC */
817
0
818
#endif /* not O_CLOEXEC */
819
);
820
} else {
821
dir_fd = open(plugindir, O_RDONLY |
822
#ifdef O_CLOEXEC
823
O_CLOEXEC
824
#else /* not O_CLOEXEC */
825
0
826
#endif /* not O_CLOEXEC */
827
);
828
}
829
if(dir_fd == -1){
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
832
goto fallback;
833
}
834
835
#ifndef O_CLOEXEC
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
838
if(ret < 0){
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
842
goto fallback;
843
}
844
#endif /* O_CLOEXEC */
845
846
dir = fdopendir(dir_fd);
847
if(dir == NULL){
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
851
goto fallback;
669
int dir_fd = dirfd(dir);
670
if(dir_fd >= 0){
671
ret = set_cloexec_flag(dir_fd);
672
if(ret < 0){
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
675
goto fallback;
676
}
852
677
}
853
678
}
854
679
856
681
857
682
/* Read and execute any executable in the plugin directory*/
858
683
while(true){
859
do {
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
684
dirst = readdir(dir);
862
685
863
686
/* All directory entries have been processed */
864
687
if(dirst == NULL){
865
if(errno == EBADF){
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
688
if (errno == EBADF){
689
perror("readdir");
690
exitstatus = EXIT_FAILURE;
868
691
goto fallback;
869
692
}
870
693
break;
876
699
{
877
700
bool bad_name = false;
878
701
879
const char * const bad_prefixes[] = { ".", "#", NULL };
702
const char const *bad_prefixes[] = { ".", "#", NULL };
880
703
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
882
705
".dpkg-old",
883
".dpkg-bak",
884
706
".dpkg-divert", NULL };
885
#ifdef __GNUC__
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
888
#endif
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
891
#ifdef __GNUC__
892
#pragma GCC diagnostic pop
893
#endif
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
894
708
size_t pre_len = strlen(*pre);
895
709
if((d_name_len >= pre_len)
896
710
and strncmp((dirst->d_name), *pre, pre_len) == 0){
905
719
if(bad_name){
906
720
continue;
907
721
}
908
#ifdef __GNUC__
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
911
#endif
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
914
#ifdef __GNUC__
915
#pragma GCC diagnostic pop
916
#endif
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
917
723
size_t suf_len = strlen(*suf);
918
724
if((d_name_len >= suf_len)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
920
726
== 0)){
921
727
if(debug){
922
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
931
737
continue;
932
738
}
933
739
}
934
740
935
741
char *filename;
936
742
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
938
dirst->d_name));
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
939
744
} else {
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
941
plugindir,
942
dirst->d_name));
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
943
746
}
944
747
if(ret < 0){
945
error(0, errno, "asprintf");
748
perror("asprintf");
946
749
continue;
947
750
}
948
751
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
950
if(ret == -1){
951
error(0, errno, "stat");
752
ret = stat(filename, &st);
753
if (ret == -1){
754
perror("stat");
952
755
free(filename);
953
756
continue;
954
757
}
955
758
956
759
/* Ignore non-executable files */
957
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
959
761
if(debug){
960
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
763
" with bad type or mode\n", filename);
966
768
967
769
plugin *p = getplugin(dirst->d_name);
968
770
if(p == NULL){
969
error(0, errno, "getplugin");
771
perror("getplugin");
970
772
free(filename);
971
773
continue;
972
774
}
984
786
if(g != NULL){
985
787
for(char **a = g->argv + 1; *a != NULL; a++){
986
788
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
789
perror("add_argument");
988
790
}
989
791
}
990
792
/* Add global environment variables */
991
793
for(char **e = g->environ; *e != NULL; e++){
992
794
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
795
perror("add_environment");
994
796
}
995
797
}
996
798
}
1001
803
if(p->environ[0] != NULL){
1002
804
for(char **e = environ; *e != NULL; e++){
1003
805
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
806
perror("add_environment");
1005
807
}
1006
808
}
1007
809
}
1008
810
1009
811
int pipefd[2];
1010
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1011
if(ret == -1){
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
812
ret = pipe(pipefd);
813
if (ret == -1){
814
perror("pipe");
815
exitstatus = EXIT_FAILURE;
1014
816
goto fallback;
1015
817
}
1016
818
/* Ask OS to automatic close the pipe on exec */
1017
819
ret = set_cloexec_flag(pipefd[0]);
1018
820
if(ret < 0){
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1021
823
goto fallback;
1022
824
}
1023
825
ret = set_cloexec_flag(pipefd[1]);
1024
826
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1027
829
goto fallback;
1028
830
}
1029
831
/* Block SIGCHLD until process is safely in process list */
1030
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
&sigchld_action.sa_mask,
1032
NULL));
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1033
833
if(ret < 0){
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1036
836
goto fallback;
1037
837
}
1038
838
/* Starting a new process to be watched */
1039
pid_t pid;
1040
do {
1041
pid = fork();
1042
} while(pid == -1 and errno == EINTR);
839
pid_t pid = fork();
1043
840
if(pid == -1){
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
841
perror("fork");
842
exitstatus = EXIT_FAILURE;
1046
843
goto fallback;
1047
844
}
1048
845
if(pid == 0){
1049
846
/* this is the child process */
1050
847
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
848
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
849
perror("sigaction");
850
_exit(EXIT_FAILURE);
1054
851
}
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
853
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
854
perror("sigprocmask");
855
_exit(EXIT_FAILURE);
1059
856
}
1060
857
1061
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
859
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
860
perror("dup2");
861
_exit(EXIT_FAILURE);
1065
862
}
1066
863
1067
864
if(dirfd(dir) < 0){
1071
868
}
1072
869
if(p->environ[0] == NULL){
1073
870
if(execv(filename, p->argv) < 0){
1074
error(0, errno, "execv for %s", filename);
1075
_exit(EX_OSERR);
871
perror("execv");
872
_exit(EXIT_FAILURE);
1076
873
}
1077
874
} else {
1078
875
if(execve(filename, p->argv, p->environ) < 0){
1079
error(0, errno, "execve for %s", filename);
1080
_exit(EX_OSERR);
876
perror("execve");
877
_exit(EXIT_FAILURE);
1081
878
}
1082
879
}
1083
880
/* no return */
1084
881
}
1085
882
/* Parent process */
1086
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1087
pipe */
883
close(pipefd[1]); /* Close unused write end of pipe */
1088
884
free(filename);
1089
885
plugin *new_plugin = getplugin(dirst->d_name);
1090
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1094
NULL)));
886
if (new_plugin == NULL){
887
perror("getplugin");
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1095
889
if(ret < 0){
1096
error(0, errno, "sigprocmask");
890
perror("sigprocmask");
1097
891
}
1098
exitstatus = EX_OSERR;
892
exitstatus = EXIT_FAILURE;
1099
893
goto fallback;
1100
894
}
1101
895
1104
898
1105
899
/* Unblock SIGCHLD so signal handler can be run if this process
1106
900
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
902
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1113
905
goto fallback;
1114
906
}
1115
907
1116
#if defined (__GNUC__) and defined (__GLIBC__)
1117
#if not __GLIBC_PREREQ(2, 16)
1118
#pragma GCC diagnostic push
1119
#pragma GCC diagnostic ignored "-Wsign-conversion"
1120
#endif
1121
#endif
1122
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1123
-Wconversion in GNU libc
1124
before 2.16 */
1125
#if defined (__GNUC__) and defined (__GLIBC__)
1126
#if not __GLIBC_PREREQ(2, 16)
1127
#pragma GCC diagnostic pop
1128
#endif
1129
#endif
908
FD_SET(new_plugin->fd, &rfds_all);
1130
909
1131
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1132
911
maxfd = new_plugin->fd;
1133
912
}
913
1134
914
}
1135
915
1136
TEMP_FAILURE_RETRY(closedir(dir));
916
closedir(dir);
1137
917
dir = NULL;
1138
free_plugin(getplugin(NULL));
1139
918
1140
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1141
920
if(p->pid != 0){
1142
921
break;
1147
926
free_plugin_list();
1148
927
}
1149
928
}
1150
929
1151
930
/* Main loop while running plugins exist */
1152
931
while(plugin_list){
1153
932
fd_set rfds = rfds_all;
1154
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1155
if(select_ret == -1 and errno != EINTR){
1156
error(0, errno, "select");
1157
exitstatus = EX_OSERR;
934
if (select_ret == -1){
935
perror("select");
936
exitstatus = EXIT_FAILURE;
1158
937
goto fallback;
1159
938
}
1160
939
/* OK, now either a process completed, or something can be read
1161
940
from one of them */
1162
941
for(plugin *proc = plugin_list; proc != NULL;){
1163
942
/* Is this process completely done? */
1164
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1165
944
/* Only accept the plugin output if it exited cleanly */
1166
945
if(not WIFEXITED(proc->status)
1167
946
or WEXITSTATUS(proc->status) != 0){
1168
947
/* Bad exit by plugin */
1169
948
1170
949
if(debug){
1171
950
if(WIFEXITED(proc->status)){
1172
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1173
" status %d\n", proc->name,
1174
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1175
953
WEXITSTATUS(proc->status));
1176
} else if(WIFSIGNALED(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1178
" signal %d: %s\n", proc->name,
1179
(intmax_t) (proc->pid),
1180
WTERMSIG(proc->status),
1181
strsignal(WTERMSIG(proc->status)));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
1182
958
} else if(WCOREDUMP(proc->status)){
1183
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1184
" core\n", proc->name, (intmax_t) (proc->pid));
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1185
961
}
1186
962
}
1187
963
1188
964
/* Remove the plugin */
1189
#if defined (__GNUC__) and defined (__GLIBC__)
1190
#if not __GLIBC_PREREQ(2, 16)
1191
#pragma GCC diagnostic push
1192
#pragma GCC diagnostic ignored "-Wsign-conversion"
1193
#endif
1194
#endif
1195
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1196
-Wconversion in GNU libc
1197
before 2.16 */
1198
#if defined (__GNUC__) and defined (__GLIBC__)
1199
#if not __GLIBC_PREREQ(2, 16)
1200
#pragma GCC diagnostic pop
1201
#endif
1202
#endif
1203
965
FD_CLR(proc->fd, &rfds_all);
966
1204
967
/* Block signal while modifying process_list */
1205
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1206
(SIG_BLOCK,
1207
&sigchld_action.sa_mask,
1208
NULL));
1209
if(ret < 0){
1210
error(0, errno, "sigprocmask");
1211
exitstatus = EX_OSERR;
1212
goto fallback;
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
if(ret < 0){
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
NULL);
978
if(ret < 0){
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
1213
986
}
1214
987
1215
988
plugin *next_plugin = proc->next;
1216
989
free_plugin(proc);
1217
990
proc = next_plugin;
1218
1219
/* We are done modifying process list, so unblock signal */
1220
ret = (int)(TEMP_FAILURE_RETRY
1221
(sigprocmask(SIG_UNBLOCK,
1222
&sigchld_action.sa_mask, NULL)));
1223
if(ret < 0){
1224
error(0, errno, "sigprocmask");
1225
exitstatus = EX_OSERR;
1226
goto fallback;
1227
}
1228
1229
if(plugin_list == NULL){
1230
break;
1231
}
1232
1233
991
continue;
1234
992
}
1235
993
1236
994
/* This process exited nicely, so print its buffer */
1237
995
1238
996
bool bret = print_out_password(proc->buffer,
1239
997
proc->buffer_length);
1240
998
if(not bret){
1241
error(0, errno, "print_out_password");
1242
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1243
1001
}
1244
1002
goto fallback;
1245
1003
}
1246
1004
1247
1005
/* This process has not completed. Does it have any output? */
1248
#if defined (__GNUC__) and defined (__GLIBC__)
1249
#if not __GLIBC_PREREQ(2, 16)
1250
#pragma GCC diagnostic push
1251
#pragma GCC diagnostic ignored "-Wsign-conversion"
1252
#endif
1253
#endif
1254
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1255
warning from
1256
-Wconversion
1257
in GNU libc
1258
before
1259
2.16 */
1260
#if defined (__GNUC__) and defined (__GLIBC__)
1261
#if not __GLIBC_PREREQ(2, 16)
1262
#pragma GCC diagnostic pop
1263
#endif
1264
#endif
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1265
1007
/* This process had nothing to say at this time */
1266
1008
proc = proc->next;
1267
1009
continue;
1268
1010
}
1269
1011
/* Before reading, make the process' data buffer large enough */
1270
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1271
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1272
+ (size_t) BUFFER_SIZE);
1273
if(new_buffer == NULL){
1274
error(0, errno, "malloc");
1275
exitstatus = EX_OSERR;
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1016
perror("malloc");
1017
exitstatus = EXIT_FAILURE;
1276
1018
goto fallback;
1277
1019
}
1278
proc->buffer = new_buffer;
1279
1020
proc->buffer_size += BUFFER_SIZE;
1280
1021
}
1281
1022
/* Read from the process */
1282
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1283
proc->buffer
1284
+ proc->buffer_length,
1285
BUFFER_SIZE));
1286
if(sret < 0){
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1024
BUFFER_SIZE);
1025
if(ret < 0){
1287
1026
/* Read error from this process; ignore the error */
1288
1027
proc = proc->next;
1289
1028
continue;
1290
1029
}
1291
if(sret == 0){
1030
if(ret == 0){
1292
1031
/* got EOF */
1293
1032
proc->eof = true;
1294
1033
} else {
1295
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1296
1035
}
1297
1036
}
1298
1037
}
1299
1300
1038
1039
1301
1040
fallback:
1302
1041
1303
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1304
and exitstatus != EX_OK)){
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1305
1043
/* Fallback if all plugins failed, none are found or an error
1306
1044
occured */
1307
1045
bool bret;
1315
1053
}
1316
1054
bret = print_out_password(passwordbuffer, len);
1317
1055
if(not bret){
1318
error(0, errno, "print_out_password");
1319
exitstatus = EX_IOERR;
1056
perror("print_out_password");
1057
exitstatus = EXIT_FAILURE;
1320
1058
}
1321
1059
}
1322
1060
1323
1061
/* Restore old signal handler */
1324
1062
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1325
1063
if(ret == -1){
1326
error(0, errno, "sigaction");
1327
exitstatus = EX_OSERR;
1064
perror("sigaction");
1065
exitstatus = EXIT_FAILURE;
1328
1066
}
1329
1067
1330
1068
if(custom_argv != NULL){
1331
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1332
1070
free(*arg);
1338
1076
closedir(dir);
1339
1077
}
1340
1078
1341
/* Kill the processes */
1079
/* Free the process list and kill the processes */
1342
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1343
1081
if(p->pid != 0){
1344
1082
close(p->fd);
1345
1083
ret = kill(p->pid, SIGTERM);
1346
1084
if(ret == -1 and errno != ESRCH){
1347
1085
/* Set-uid proccesses might not get closed */
1348
error(0, errno, "kill");
1086
perror("kill");
1349
1087
}
1350
1088
}
1351
1089
}
1352
1090
1353
1091
/* Wait for any remaining child processes to terminate */
1354
do {
1092
do{
1355
1093
ret = wait(NULL);
1356
1094
} while(ret >= 0);
1357
1095
if(errno != ECHILD){
1358
error(0, errno, "wait");
1096
perror("wait");
1359
1097
}
1360
1098
1361
1099
free_plugin_list();
1362
1100
1363
1101
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0