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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:21:53 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106222153-3b43cfdjyvz1032y
Tags: version-1.0.3-2
* debian/changelog (1.0.3-2): New entry.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
67
76
68
#define BUFFER_SIZE 256
77
69
79
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
72
81
73
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
75
84
76
typedef struct plugin{
85
77
char *name; /* can be NULL or any plugin name */
88
80
char **environ;
89
81
int envc;
90
82
bool disabled;
91
83
92
84
/* Variables used for running processes*/
93
85
pid_t pid;
94
86
int fd;
96
88
size_t buffer_size;
97
89
size_t buffer_length;
98
90
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
91
volatile bool completed;
92
volatile int status;
101
93
struct plugin *next;
102
94
} plugin;
103
95
105
97
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
100
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))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
114
105
return p;
115
106
}
116
107
}
117
108
/* 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){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
123
111
return NULL;
124
112
}
125
113
char *copy_name = NULL;
126
114
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
130
116
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
117
return NULL;
135
118
}
136
119
}
137
120
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
142
125
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;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
148
128
free(copy_name);
149
129
free(new_plugin);
150
errno = e;
151
130
return NULL;
152
131
}
153
132
new_plugin->argv[0] = copy_name;
154
133
new_plugin->argv[1] = NULL;
155
134
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
159
136
if(new_plugin->environ == NULL){
160
int e = errno;
161
137
free(copy_name);
162
138
free(new_plugin->argv);
163
139
free(new_plugin);
164
errno = e;
165
140
return NULL;
166
141
}
167
142
new_plugin->environ[0] = NULL;
172
147
}
173
148
174
149
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
150
static bool add_to_char_array(const char *new, char ***array,
177
151
int *len){
178
152
/* 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);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
184
155
/* Malloc check */
185
if(new_array == NULL){
156
if(*array == NULL){
186
157
return false;
187
158
}
188
*array = new_array;
189
159
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
194
161
if(copy == NULL){
195
162
return false;
196
163
}
203
170
}
204
171
205
172
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
173
static bool add_argument(plugin *p, const char *arg){
208
174
if(p == NULL){
209
175
return false;
212
178
}
213
179
214
180
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
181
static bool add_environment(plugin *p, const char *def, bool replace){
217
182
if(p == NULL){
218
183
return false;
220
185
/* namelen = length of name of environment variable */
221
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
187
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
225
190
/* It already exists */
226
191
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){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
232
194
return false;
233
195
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
236
198
}
237
199
return true;
238
200
}
240
202
return add_to_char_array(def, &(p->environ), &(p->envc));
241
203
}
242
204
243
#ifndef O_CLOEXEC
244
205
/*
245
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
207
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
209
*/
249
__attribute__((warn_unused_result))
250
210
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
252
212
/* If reading the flags failed, return error indication now. */
253
213
if(ret < 0){
254
214
return ret;
255
215
}
256
216
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
218
}
260
#endif /* not O_CLOEXEC */
261
219
262
220
263
221
/* Mark processes as completed when they exit, and save their exit
264
222
status. */
265
223
static void handle_sigchld(__attribute__((unused)) int sig){
266
int old_errno = errno;
267
224
while(true){
268
225
plugin *proc = plugin_list;
269
226
int status;
273
230
break;
274
231
}
275
232
if(pid == -1){
276
if(errno == ECHILD){
277
/* No child processes */
278
break;
233
if (errno != ECHILD){
234
perror("waitpid");
279
235
}
280
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
281
238
}
282
239
283
240
/* A child exited, find it in process_list */
289
246
continue;
290
247
}
291
248
proc->status = status;
292
proc->completed = 1;
249
proc->completed = true;
293
250
}
294
errno = old_errno;
295
251
}
296
252
297
253
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
254
static bool print_out_password(const char *buffer, size_t length){
300
255
ssize_t ret;
301
256
for(size_t written = 0; written < length; written += (size_t)ret){
309
264
}
310
265
311
266
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
267
static void free_plugin(plugin *plugin_node){
314
268
315
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
275
}
322
276
free(plugin_node->environ);
323
277
free(plugin_node->buffer);
324
278
325
279
/* Removes the plugin from the singly-linked list */
326
280
if(plugin_node == plugin_list){
327
281
/* First one - simple */
349
303
char *plugindir = NULL;
350
304
char *argfile = NULL;
351
305
FILE *conffp;
352
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
353
309
struct stat st;
354
310
fd_set rfds_all;
355
311
int ret, maxfd = 0;
356
ssize_t sret;
357
312
uid_t uid = 65534;
358
313
gid_t gid = 65534;
359
314
bool debug = false;
363
318
.sa_flags = SA_NOCLDSTOP };
364
319
char **custom_argv = NULL;
365
320
int custom_argc = 0;
366
int dir_fd = -1;
367
321
368
322
/* Establish a signal handler */
369
323
sigemptyset(&sigchld_action.sa_mask);
370
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
325
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
374
328
goto fallback;
375
329
}
376
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
331
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
380
334
goto fallback;
381
335
}
382
336
414
368
.doc = "Group ID the plugins will run as", .group = 3 },
415
369
{ .name = "debug", .key = 132,
416
370
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
426
371
{ .name = NULL }
427
372
};
428
373
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
435
377
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
441
387
}
442
388
}
443
errno = 0;
444
389
}
445
390
break;
446
391
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
449
397
}
450
398
break;
451
399
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
473
419
}
474
420
break;
475
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
476
425
{
477
426
char *envdef = strchr(arg, ':');
478
427
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
428
break;
482
429
}
483
430
*envdef = '\0';
484
envdef++;
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
492
433
}
493
434
}
494
435
break;
495
436
case 'd': /* --disable */
496
{
437
if (arg != NULL){
497
438
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
501
441
}
442
p->disabled = true;
502
443
}
503
444
break;
504
445
case 'e': /* --enable */
505
{
446
if (arg != NULL){
506
447
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
510
450
}
451
p->disabled = false;
511
452
}
512
453
break;
513
454
case 128: /* --plugin-dir */
514
455
free(plugindir);
515
456
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
457
if(plugindir == NULL){
458
perror("strdup");
459
}
519
460
break;
520
461
case 129: /* --config-file */
521
462
/* This is already done by parse_opt_config_file() */
522
463
break;
523
464
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
465
uid = (uid_t)strtol(arg, NULL, 10);
533
466
break;
534
467
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
468
gid = (gid_t)strtol(arg, NULL, 10);
544
469
break;
545
470
case 132: /* --debug */
546
471
debug = true;
547
472
break;
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
473
case ARGP_KEY_ARG:
567
474
/* Cryptsetup always passes an argument, which is an empty
568
475
string if "none" was specified in /etc/crypttab. So if
569
476
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
572
479
}
480
break;
481
case ARGP_KEY_END:
482
break;
573
483
default:
574
484
return ARGP_ERR_UNKNOWN;
575
485
}
576
return errno; /* Set to 0 at start */
486
return 0;
577
487
}
578
488
579
489
/* This option parser is the same as parse_opt() above, except it
580
490
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
586
495
case 'g': /* --global-options */
587
496
case 'G': /* --global-env */
588
497
case 'o': /* --options-for */
594
503
case 129: /* --config-file */
595
504
free(argfile);
596
505
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
506
if(argfile == NULL){
507
perror("strdup");
599
508
}
600
break;
509
break;
601
510
case 130: /* --userid */
602
511
case 131: /* --groupid */
603
512
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
608
515
break;
609
516
default:
610
517
return ARGP_ERR_UNKNOWN;
611
518
}
612
return errno;
519
return 0;
613
520
}
614
521
615
522
struct argp argp = { .options = options,
617
524
.args_doc = "",
618
525
.doc = "Mandos plugin runner -- Run plugins" };
619
526
620
/* Parse using parse_opt_config_file() in order to get the custom
527
/* Parse using the parse_opt_config_file in order to get the custom
621
528
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
636
533
goto fallback;
637
534
}
638
535
640
537
argp.parser = parse_opt;
641
538
642
539
/* Open the configfile if available */
643
if(argfile == NULL){
540
if (argfile == NULL){
644
541
conffp = fopen(AFILE, "r");
645
542
} else {
646
543
conffp = fopen(argfile, "r");
647
}
544
}
648
545
if(conffp != NULL){
649
546
char *org_line = NULL;
650
547
char *p, *arg, *new_arg, *line;
651
548
size_t size = 0;
549
ssize_t sret;
652
550
const char whitespace_delims[] = " \r\t\f\v\n";
653
551
const char comment_delim[] = "#";
654
552
655
553
custom_argc = 1;
656
554
custom_argv = malloc(sizeof(char*) * 2);
657
555
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
660
558
goto fallback;
661
559
}
662
560
custom_argv[0] = argv[0];
663
561
custom_argv[1] = NULL;
664
562
665
563
/* for each line in the config file, strip whitespace and ignore
666
564
commented text */
667
565
while(true){
669
567
if(sret == -1){
670
568
break;
671
569
}
672
570
673
571
line = org_line;
674
572
arg = strsep(&line, comment_delim);
675
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
576
}
679
577
new_arg = strdup(p);
680
578
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
683
581
free(org_line);
684
582
goto fallback;
685
583
}
686
584
687
585
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
701
593
}
702
594
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
704
596
}
705
597
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
714
598
free(org_line);
715
599
} else {
716
600
/* Check for harmful errors and go to fallback. Other errors might
717
601
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
721
605
goto fallback;
722
606
}
723
607
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
726
610
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
741
616
goto fallback;
742
617
}
743
618
}
744
619
745
620
/* Parse actual command line arguments, to let them override the
746
621
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
761
626
goto fallback;
762
627
}
763
628
768
633
for(char **a = p->argv; *a != NULL; a++){
769
634
fprintf(stderr, "\tArg: %s\n", *a);
770
635
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
637
for(char **a = p->environ; *a != NULL; a++){
773
638
fprintf(stderr, "\t%s\n", *a);
774
639
}
775
640
}
776
641
}
777
642
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
643
/* Strip permissions down to nobody */
807
644
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
666
{
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
exitstatus = EX_OSERR;
833
goto fallback;
834
}
835
#endif /* O_CLOEXEC */
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
858
674
}
859
675
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
880
676
}
881
677
882
678
FD_ZERO(&rfds_all);
883
679
884
680
/* Read and execute any executable in the plugin directory*/
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
891
continue;
892
}
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
if(ret == -1){
895
error(0, errno, "stat");
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
898
continue;
899
}
900
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
901
758
/* Ignore non-executable files */
902
if(not S_ISREG(st.st_mode)
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
905
760
if(debug){
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
910
763
}
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
764
free(filename);
913
765
continue;
914
766
}
915
767
916
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
917
769
if(p == NULL){
918
error(0, errno, "getplugin");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
921
772
continue;
922
773
}
923
774
if(p->disabled){
924
775
if(debug){
925
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
926
direntries[i]->d_name);
777
dirst->d_name);
927
778
}
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
779
free(filename);
930
780
continue;
931
781
}
932
782
{
935
785
if(g != NULL){
936
786
for(char **a = g->argv + 1; *a != NULL; a++){
937
787
if(not add_argument(p, *a)){
938
error(0, errno, "add_argument");
788
perror("add_argument");
939
789
}
940
790
}
941
791
/* Add global environment variables */
942
792
for(char **e = g->environ; *e != NULL; e++){
943
793
if(not add_environment(p, *e, false)){
944
error(0, errno, "add_environment");
794
perror("add_environment");
945
795
}
946
796
}
947
797
}
948
798
}
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
951
802
if(p->environ[0] != NULL){
952
803
for(char **e = environ; *e != NULL; e++){
953
804
if(not add_environment(p, *e, false)){
954
error(0, errno, "add_environment");
805
perror("add_environment");
955
806
}
956
807
}
957
808
}
958
809
959
810
int pipefd[2];
960
#ifndef O_CLOEXEC
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
965
if(ret == -1){
966
error(0, errno, "pipe");
967
exitstatus = EX_OSERR;
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
981
817
/* Ask OS to automatic close the pipe on exec */
982
818
ret = set_cloexec_flag(pipefd[0]);
983
819
if(ret < 0){
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
989
822
goto fallback;
990
823
}
991
824
ret = set_cloexec_flag(pipefd[1]);
992
825
if(ret < 0){
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
998
828
goto fallback;
999
829
}
1000
#endif /* not O_CLOEXEC */
1001
830
/* Block SIGCHLD until process is safely in process list */
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
&sigchld_action.sa_mask,
1004
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1005
832
if(ret < 0){
1006
error(0, errno, "sigprocmask");
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1009
835
goto fallback;
1010
836
}
1011
837
/* Starting a new process to be watched */
1012
pid_t pid;
1013
do {
1014
pid = fork();
1015
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1016
839
if(pid == -1){
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1024
842
goto fallback;
1025
843
}
1026
844
if(pid == 0){
1027
845
/* this is the child process */
1028
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1029
847
if(ret < 0){
1030
error(0, errno, "sigaction");
1031
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1032
850
}
1033
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
852
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1037
855
}
1038
856
1039
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1040
858
if(ret == -1){
1041
error(0, errno, "dup2");
1042
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1043
861
}
1044
862
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1051
878
}
1052
879
/* no return */
1053
880
}
1054
881
/* Parent process */
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1056
pipe */
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1059
if(new_plugin == NULL){
1060
error(0, errno, "getplugin");
1061
ret = (int)(TEMP_FAILURE_RETRY
1062
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1063
NULL)));
882
close(pipefd[1]); /* Close unused write end of pipe */
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1064
888
if(ret < 0){
1065
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1066
890
}
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1069
892
goto fallback;
1070
893
}
1071
free(direntries[i]);
1072
894
1073
895
new_plugin->pid = pid;
1074
896
new_plugin->fd = pipefd[0];
1075
897
1076
898
/* Unblock SIGCHLD so signal handler can be run if this process
1077
899
has already completed */
1078
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1079
&sigchld_action.sa_mask,
1080
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1081
901
if(ret < 0){
1082
error(0, errno, "sigprocmask");
1083
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1084
904
goto fallback;
1085
905
}
1086
906
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
907
FD_SET(new_plugin->fd, &rfds_all);
1101
908
1102
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1103
910
maxfd = new_plugin->fd;
1104
911
}
1105
912
}
1106
913
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1111
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1112
916
1113
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1114
918
if(p->pid != 0){
1125
929
while(plugin_list){
1126
930
fd_set rfds = rfds_all;
1127
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1128
if(select_ret == -1 and errno != EINTR){
1129
error(0, errno, "select");
1130
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1131
935
goto fallback;
1132
936
}
1133
937
/* OK, now either a process completed, or something can be read
1134
938
from one of them */
1135
939
for(plugin *proc = plugin_list; proc != NULL;){
1136
940
/* Is this process completely done? */
1137
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1138
942
/* Only accept the plugin output if it exited cleanly */
1139
943
if(not WIFEXITED(proc->status)
1140
944
or WEXITSTATUS(proc->status) != 0){
1141
945
/* Bad exit by plugin */
1142
946
1143
947
if(debug){
1144
948
if(WIFEXITED(proc->status)){
1145
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1146
" status %d\n", proc->name,
1147
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1148
951
WEXITSTATUS(proc->status));
1149
} else if(WIFSIGNALED(proc->status)){
1150
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1151
" signal %d: %s\n", proc->name,
1152
(intmax_t) (proc->pid),
1153
WTERMSIG(proc->status),
1154
strsignal(WTERMSIG(proc->status)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
1155
956
} else if(WCOREDUMP(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1157
" core\n", proc->name, (intmax_t) (proc->pid));
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1158
959
}
1159
960
}
1160
961
1161
962
/* Remove the plugin */
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1176
963
FD_CLR(proc->fd, &rfds_all);
964
1177
965
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
967
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1185
970
goto fallback;
1186
971
}
1187
972
1190
975
proc = next_plugin;
1191
976
1192
977
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1196
980
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1199
983
goto fallback;
1200
984
}
1201
985
1211
995
bool bret = print_out_password(proc->buffer,
1212
996
proc->buffer_length);
1213
997
if(not bret){
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1216
1000
}
1217
1001
goto fallback;
1218
1002
}
1219
1003
1220
1004
/* This process has not completed. Does it have any output? */
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1228
warning from
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1238
1006
/* This process had nothing to say at this time */
1239
1007
proc = proc->next;
1240
1008
continue;
1241
1009
}
1242
1010
/* Before reading, make the process' data buffer large enough */
1243
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1247
error(0, errno, "malloc");
1248
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1249
1017
goto fallback;
1250
1018
}
1251
proc->buffer = new_buffer;
1252
1019
proc->buffer_size += BUFFER_SIZE;
1253
1020
}
1254
1021
/* Read from the process */
1255
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1256
proc->buffer
1257
+ proc->buffer_length,
1258
BUFFER_SIZE));
1259
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1260
1025
/* Read error from this process; ignore the error */
1261
1026
proc = proc->next;
1262
1027
continue;
1263
1028
}
1264
if(sret == 0){
1029
if(ret == 0){
1265
1030
/* got EOF */
1266
1031
proc->eof = true;
1267
1032
} else {
1268
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1269
1034
}
1270
1035
}
1271
1036
}
1272
1273
1037
1038
1274
1039
fallback:
1275
1040
1276
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1277
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1278
1042
/* Fallback if all plugins failed, none are found or an error
1279
1043
occured */
1280
1044
bool bret;
1288
1052
}
1289
1053
bret = print_out_password(passwordbuffer, len);
1290
1054
if(not bret){
1291
error(0, errno, "print_out_password");
1292
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1293
1057
}
1294
1058
}
1295
1059
1296
1060
/* Restore old signal handler */
1297
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1298
1062
if(ret == -1){
1299
error(0, errno, "sigaction");
1300
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1301
1065
}
1302
1066
1303
1067
if(custom_argv != NULL){
1307
1071
free(custom_argv);
1308
1072
}
1309
1073
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1074
if(dir != NULL){
1075
closedir(dir);
1314
1076
}
1315
1077
1316
1078
/* Kill the processes */
1320
1082
ret = kill(p->pid, SIGTERM);
1321
1083
if(ret == -1 and errno != ESRCH){
1322
1084
/* Set-uid proccesses might not get closed */
1323
error(0, errno, "kill");
1085
perror("kill");
1324
1086
}
1325
1087
}
1326
1088
}
1327
1089
1328
1090
/* Wait for any remaining child processes to terminate */
1329
do {
1091
do{
1330
1092
ret = wait(NULL);
1331
1093
} while(ret >= 0);
1332
1094
if(errno != ECHILD){
1333
error(0, errno, "wait");
1095
perror("wait");
1334
1096
}
1335
1097
1336
1098
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0