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- Committer: Teddy Hogeborn
- Date: 2009-01-12 22:02:33 UTC
- Revision ID: teddy@fukt.bsnet.se-20090112220233-lawxo4uvyzb38u1f
* README (The Plugin System): Removed redundant text about options and
files for the plugins, this is now
documented in the manuals for the
plugins.
* plugins.d/mandos-client.c (main): Remove comment which was copied
from another program by mistake.
Use "sscanf" instead of "strtol"
to parse numbers; this uses the
correct type instead of casting.
Don't report errors when removing
temporary directory if directory
is already gone.
files for the plugins, this is now
documented in the manuals for the
plugins.
* plugins.d/mandos-client.c (main): Remove comment which was copied
from another program by mistake.
Use "sscanf" instead of "strtol"
to parse numbers; this uses the
correct type instead of casting.
Don't report errors when removing
temporary directory if directory
is already gone.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- mandos-ctl => mandos-list
- 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;
363
319
.sa_flags = SA_NOCLDSTOP };
364
320
char **custom_argv = NULL;
365
321
int custom_argc = 0;
366
int dir_fd = -1;
367
322
368
323
/* Establish a signal handler */
369
324
sigemptyset(&sigchld_action.sa_mask);
370
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
326
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
327
perror("sigaddset");
328
exitstatus = EXIT_FAILURE;
374
329
goto fallback;
375
330
}
376
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
332
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
333
perror("sigaction");
334
exitstatus = EXIT_FAILURE;
380
335
goto fallback;
381
336
}
382
337
414
369
.doc = "Group ID the plugins will run as", .group = 3 },
415
370
{ .name = "debug", .key = 132,
416
371
.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
372
{ .name = NULL }
427
373
};
428
374
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;
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
377
switch (key) {
435
378
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;
379
if (arg != NULL){
380
char *p;
381
while((p = strsep(&arg, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
441
388
}
442
389
}
443
errno = 0;
444
390
}
445
391
break;
446
392
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
393
if(arg == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
449
398
}
450
399
break;
451
400
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;
401
if (arg != NULL){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
404
break;
405
}
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
408
break;
409
}
410
char *p;
411
while((p = strsep(&opt, ",")) != NULL){
412
if(p[0] == '\0'){
413
continue;
414
}
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
418
}
419
}
473
420
}
474
421
break;
475
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
476
426
{
477
427
char *envdef = strchr(arg, ':');
478
428
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
429
break;
482
430
}
483
431
*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;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
492
434
}
493
435
}
494
436
break;
495
437
case 'd': /* --disable */
496
{
438
if (arg != NULL){
497
439
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
501
442
}
443
p->disabled = true;
502
444
}
503
445
break;
504
446
case 'e': /* --enable */
505
{
447
if (arg != NULL){
506
448
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
510
451
}
452
p->disabled = false;
511
453
}
512
454
break;
513
455
case 128: /* --plugin-dir */
514
456
free(plugindir);
515
457
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
458
if(plugindir == NULL){
459
perror("strdup");
460
}
519
461
break;
520
462
case 129: /* --config-file */
521
463
/* This is already done by parse_opt_config_file() */
522
464
break;
523
465
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;
466
uid = (uid_t)strtol(arg, NULL, 10);
533
467
break;
534
468
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;
469
gid = (gid_t)strtol(arg, NULL, 10);
544
470
break;
545
471
case 132: /* --debug */
546
472
debug = true;
547
473
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
474
case ARGP_KEY_ARG:
567
475
/* Cryptsetup always passes an argument, which is an empty
568
476
string if "none" was specified in /etc/crypttab. So if
569
477
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
478
if(arg[0] != '\0'){
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
572
480
}
481
break;
482
case ARGP_KEY_END:
483
break;
573
484
default:
574
485
return ARGP_ERR_UNKNOWN;
575
486
}
576
return errno; /* Set to 0 at start */
487
return 0;
577
488
}
578
489
579
490
/* This option parser is the same as parse_opt() above, except it
580
491
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){
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
495
switch (key) {
586
496
case 'g': /* --global-options */
587
497
case 'G': /* --global-env */
588
498
case 'o': /* --options-for */
594
504
case 129: /* --config-file */
595
505
free(argfile);
596
506
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
507
if(argfile == NULL){
508
perror("strdup");
599
509
}
600
break;
510
break;
601
511
case 130: /* --userid */
602
512
case 131: /* --groupid */
603
513
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
514
case ARGP_KEY_ARG:
515
case ARGP_KEY_END:
608
516
break;
609
517
default:
610
518
return ARGP_ERR_UNKNOWN;
611
519
}
612
return errno;
520
return 0;
613
521
}
614
522
615
523
struct argp argp = { .options = options,
617
525
.args_doc = "",
618
526
.doc = "Mandos plugin runner -- Run plugins" };
619
527
620
/* Parse using parse_opt_config_file() in order to get the custom
528
/* Parse using the parse_opt_config_file in order to get the custom
621
529
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;
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
531
if (ret == ARGP_ERR_UNKNOWN){
532
fprintf(stderr, "Unknown error while parsing arguments\n");
533
exitstatus = EXIT_FAILURE;
636
534
goto fallback;
637
535
}
638
536
640
538
argp.parser = parse_opt;
641
539
642
540
/* Open the configfile if available */
643
if(argfile == NULL){
541
if (argfile == NULL){
644
542
conffp = fopen(AFILE, "r");
645
543
} else {
646
544
conffp = fopen(argfile, "r");
647
}
545
}
648
546
if(conffp != NULL){
649
547
char *org_line = NULL;
650
548
char *p, *arg, *new_arg, *line;
651
549
size_t size = 0;
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));
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1259
1024
if(sret < 0){
1260
1025
/* Read error from this process; ignore the error */
1261
1026
proc = proc->next;
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