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- Committer: Teddy Hogeborn
- Date: 2009-01-13 04:29:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20090113042935-ztxe47n42q5z767b
* plugin-runner.c (main): Bug fix; do not accept a "d" character after
user ID or group ID numbers. Bug fix: use
"%u" when printing PID of coredumped plugin,
not "%d".
* plugins.d/password-prompt.c (main): Remove comment which was copied
from another program by mistake.
* plugins.d/splashy.c: Only comment changes.
* plugins.d/usplash.c: - '' -
user ID or group ID numbers. Bug fix: use
"%u" when printing PID of coredumped plugin,
not "%d".
* plugins.d/password-prompt.c (main): Remove comment which was copied
from another program by mistake.
* plugins.d/splashy.c: Only comment changes.
* plugins.d/usplash.c: - '' -
- 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;
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
468
if(ret != 1){
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
470
uid);
530
471
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
472
break;
534
473
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;
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
476
if(ret != 1){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
478
arg, gid);
541
479
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
480
break;
545
481
case 132: /* --debug */
546
482
debug = true;
547
483
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
484
/*
563
485
* When adding more options before this line, remember to also add a
564
486
* "case" to the "parse_opt_config_file" function below.
567
489
/* Cryptsetup always passes an argument, which is an empty
568
490
string if "none" was specified in /etc/crypttab. So if
569
491
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
492
if(arg[0] != '\0'){
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
572
494
}
495
break;
496
case ARGP_KEY_END:
497
break;
573
498
default:
574
499
return ARGP_ERR_UNKNOWN;
575
500
}
576
return errno; /* Set to 0 at start */
501
return 0;
577
502
}
578
503
579
504
/* This option parser is the same as parse_opt() above, except it
580
505
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){
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
509
switch (key) {
586
510
case 'g': /* --global-options */
587
511
case 'G': /* --global-env */
588
512
case 'o': /* --options-for */
594
518
case 129: /* --config-file */
595
519
free(argfile);
596
520
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
521
if(argfile == NULL){
522
perror("strdup");
599
523
}
600
break;
524
break;
601
525
case 130: /* --userid */
602
526
case 131: /* --groupid */
603
527
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
528
case ARGP_KEY_ARG:
529
case ARGP_KEY_END:
608
530
break;
609
531
default:
610
532
return ARGP_ERR_UNKNOWN;
611
533
}
612
return errno;
534
return 0;
613
535
}
614
536
615
537
struct argp argp = { .options = options,
619
541
620
542
/* Parse using parse_opt_config_file() in order to get the custom
621
543
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;
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if (ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
636
548
goto fallback;
637
549
}
638
550
640
552
argp.parser = parse_opt;
641
553
642
554
/* Open the configfile if available */
643
if(argfile == NULL){
555
if (argfile == NULL){
644
556
conffp = fopen(AFILE, "r");
645
557
} else {
646
558
conffp = fopen(argfile, "r");
647
}
559
}
648
560
if(conffp != NULL){
649
561
char *org_line = NULL;
650
562
char *p, *arg, *new_arg, *line;
651
563
size_t size = 0;
652
564
const char whitespace_delims[] = " \r\t\f\v\n";
653
565
const char comment_delim[] = "#";
654
566
655
567
custom_argc = 1;
656
568
custom_argv = malloc(sizeof(char*) * 2);
657
569
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
570
perror("malloc");
571
exitstatus = EXIT_FAILURE;
660
572
goto fallback;
661
573
}
662
574
custom_argv[0] = argv[0];
663
575
custom_argv[1] = NULL;
664
576
665
577
/* for each line in the config file, strip whitespace and ignore
666
578
commented text */
667
579
while(true){
669
581
if(sret == -1){
670
582
break;
671
583
}
672
584
673
585
line = org_line;
674
586
arg = strsep(&line, comment_delim);
675
587
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
590
}
679
591
new_arg = strdup(p);
680
592
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
593
perror("strdup");
594
exitstatus = EXIT_FAILURE;
683
595
free(org_line);
684
596
goto fallback;
685
597
}
686
598
687
599
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
}
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
603
perror("realloc");
604
exitstatus = EXIT_FAILURE;
605
free(org_line);
606
goto fallback;
701
607
}
702
608
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
704
610
}
705
611
}
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
612
free(org_line);
715
613
} else {
716
614
/* Check for harmful errors and go to fallback. Other errors might
717
615
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
617
perror("fopen");
618
exitstatus = EXIT_FAILURE;
721
619
goto fallback;
722
620
}
723
621
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
726
624
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;
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
626
0, NULL);
627
if (ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
741
630
goto fallback;
742
631
}
743
632
}
744
633
745
634
/* Parse actual command line arguments, to let them override the
746
635
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;
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
761
640
goto fallback;
762
641
}
763
642
768
647
for(char **a = p->argv; *a != NULL; a++){
769
648
fprintf(stderr, "\tArg: %s\n", *a);
770
649
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
651
for(char **a = p->environ; *a != NULL; a++){
773
652
fprintf(stderr, "\t%s\n", *a);
774
653
}
775
654
}
776
655
}
777
656
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
}
657
/* Strip permissions down to nobody */
807
658
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
659
if (ret == -1){
660
perror("setuid");
661
}
662
setgid(gid);
663
if (ret == -1){
664
perror("setgid");
665
}
666
667
if (plugindir == NULL){
668
dir = opendir(PDIR);
669
} else {
670
dir = opendir(plugindir);
671
}
672
673
if(dir == NULL){
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
676
goto fallback;
677
}
678
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
680
{
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;
681
int dir_fd = dirfd(dir);
682
if(dir_fd >= 0){
683
ret = set_cloexec_flag(dir_fd);
684
if(ret < 0){
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
687
goto fallback;
858
688
}
859
689
}
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
690
}
881
691
882
692
FD_ZERO(&rfds_all);
883
693
884
694
/* 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
continue;
891
}
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
893
if(ret == -1){
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
896
continue;
897
}
898
695
while(true){
696
dirst = readdir(dir);
697
698
/* All directory entries have been processed */
699
if(dirst == NULL){
700
if (errno == EBADF){
701
perror("readdir");
702
exitstatus = EXIT_FAILURE;
703
goto fallback;
704
}
705
break;
706
}
707
708
d_name_len = strlen(dirst->d_name);
709
710
/* Ignore dotfiles, backup files and other junk */
711
{
712
bool bad_name = false;
713
714
const char const *bad_prefixes[] = { ".", "#", NULL };
715
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
717
".dpkg-old",
718
".dpkg-bak",
719
".dpkg-divert", NULL };
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
721
size_t pre_len = strlen(*pre);
722
if((d_name_len >= pre_len)
723
and strncmp((dirst->d_name), *pre, pre_len) == 0){
724
if(debug){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad prefix %s\n", dirst->d_name, *pre);
727
}
728
bad_name = true;
729
break;
730
}
731
}
732
if(bad_name){
733
continue;
734
}
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
size_t suf_len = strlen(*suf);
737
if((d_name_len >= suf_len)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
739
== 0)){
740
if(debug){
741
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
742
" with bad suffix %s\n", dirst->d_name, *suf);
743
}
744
bad_name = true;
745
break;
746
}
747
}
748
749
if(bad_name){
750
continue;
751
}
752
}
753
754
char *filename;
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
757
} else {
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
759
}
760
if(ret < 0){
761
perror("asprintf");
762
continue;
763
}
764
765
ret = stat(filename, &st);
766
if (ret == -1){
767
perror("stat");
768
free(filename);
769
continue;
770
}
771
899
772
/* Ignore non-executable files */
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
902
X_OK, 0)) != 0)){
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
903
774
if(debug){
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
" with bad type or mode\n", filename);
908
777
}
909
TEMP_FAILURE_RETRY(close(plugin_fd));
778
free(filename);
910
779
continue;
911
780
}
912
781
913
plugin *p = getplugin(direntries[i]->d_name);
782
plugin *p = getplugin(dirst->d_name);
914
783
if(p == NULL){
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
784
perror("getplugin");
785
free(filename);
917
786
continue;
918
787
}
919
788
if(p->disabled){
920
789
if(debug){
921
790
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
direntries[i]->d_name);
791
dirst->d_name);
923
792
}
924
TEMP_FAILURE_RETRY(close(plugin_fd));
793
free(filename);
925
794
continue;
926
795
}
927
796
{
930
799
if(g != NULL){
931
800
for(char **a = g->argv + 1; *a != NULL; a++){
932
801
if(not add_argument(p, *a)){
933
error(0, errno, "add_argument");
802
perror("add_argument");
934
803
}
935
804
}
936
805
/* Add global environment variables */
937
806
for(char **e = g->environ; *e != NULL; e++){
938
807
if(not add_environment(p, *e, false)){
939
error(0, errno, "add_environment");
808
perror("add_environment");
940
809
}
941
810
}
942
811
}
943
812
}
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
813
/* If this plugin has any environment variables, we will call
814
using execve and need to duplicate the environment from this
815
process, too. */
946
816
if(p->environ[0] != NULL){
947
817
for(char **e = environ; *e != NULL; e++){
948
818
if(not add_environment(p, *e, false)){
949
error(0, errno, "add_environment");
819
perror("add_environment");
950
820
}
951
821
}
952
822
}
953
823
954
824
int pipefd[2];
955
#ifndef O_CLOEXEC
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
960
if(ret == -1){
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
963
goto fallback;
964
}
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
967
FD_SETSIZE);
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
971
goto fallback;
972
}
973
#ifndef O_CLOEXEC
825
ret = pipe(pipefd);
826
if (ret == -1){
827
perror("pipe");
828
exitstatus = EXIT_FAILURE;
829
goto fallback;
830
}
974
831
/* Ask OS to automatic close the pipe on exec */
975
832
ret = set_cloexec_flag(pipefd[0]);
976
833
if(ret < 0){
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
981
836
goto fallback;
982
837
}
983
838
ret = set_cloexec_flag(pipefd[1]);
984
839
if(ret < 0){
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
989
842
goto fallback;
990
843
}
991
#endif /* not O_CLOEXEC */
992
844
/* Block SIGCHLD until process is safely in process list */
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
995
NULL));
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
996
846
if(ret < 0){
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
999
849
goto fallback;
1000
850
}
1001
851
/* Starting a new process to be watched */
1002
pid_t pid;
1003
do {
1004
pid = fork();
1005
} while(pid == -1 and errno == EINTR);
852
pid_t pid = fork();
1006
853
if(pid == -1){
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
854
perror("fork");
855
exitstatus = EXIT_FAILURE;
1013
856
goto fallback;
1014
857
}
1015
858
if(pid == 0){
1016
859
/* this is the child process */
1017
860
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1018
861
if(ret < 0){
1019
error(0, errno, "sigaction");
1020
_exit(EX_OSERR);
862
perror("sigaction");
863
_exit(EXIT_FAILURE);
1021
864
}
1022
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
866
if(ret < 0){
1024
error(0, errno, "sigprocmask");
1025
_exit(EX_OSERR);
867
perror("sigprocmask");
868
_exit(EXIT_FAILURE);
1026
869
}
1027
870
1028
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1029
872
if(ret == -1){
1030
error(0, errno, "dup2");
1031
_exit(EX_OSERR);
873
perror("dup2");
874
_exit(EXIT_FAILURE);
1032
875
}
1033
876
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
1039
_exit(EX_OSERR);
877
if(dirfd(dir) < 0){
878
/* If dir has no file descriptor, we could not set FD_CLOEXEC
879
above and must now close it manually here. */
880
closedir(dir);
881
}
882
if(p->environ[0] == NULL){
883
if(execv(filename, p->argv) < 0){
884
perror("execv");
885
_exit(EXIT_FAILURE);
886
}
887
} else {
888
if(execve(filename, p->argv, p->environ) < 0){
889
perror("execve");
890
_exit(EXIT_FAILURE);
891
}
1040
892
}
1041
893
/* no return */
1042
894
}
1043
895
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
896
close(pipefd[1]); /* Close unused write end of pipe */
897
free(filename);
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
900
perror("getplugin");
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1053
902
if(ret < 0){
1054
error(0, errno, "sigprocmask");
903
perror("sigprocmask");
1055
904
}
1056
exitstatus = EX_OSERR;
905
exitstatus = EXIT_FAILURE;
1057
906
goto fallback;
1058
907
}
1059
908
1062
911
1063
912
/* Unblock SIGCHLD so signal handler can be run if this process
1064
913
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1068
915
if(ret < 0){
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1071
918
goto fallback;
1072
919
}
1073
920
1074
#if defined (__GNUC__) and defined (__GLIBC__)
1075
#if not __GLIBC_PREREQ(2, 16)
1076
#pragma GCC diagnostic push
1077
#pragma GCC diagnostic ignored "-Wsign-conversion"
1078
#endif
1079
#endif
1080
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1081
-Wconversion in GNU libc
1082
before 2.16 */
1083
#if defined (__GNUC__) and defined (__GLIBC__)
1084
#if not __GLIBC_PREREQ(2, 16)
1085
#pragma GCC diagnostic pop
1086
#endif
1087
#endif
921
FD_SET(new_plugin->fd, &rfds_all);
1088
922
1089
if(maxfd < new_plugin->fd){
923
if (maxfd < new_plugin->fd){
1090
924
maxfd = new_plugin->fd;
1091
925
}
1092
926
}
1093
927
1094
free(direntries);
1095
direntries = NULL;
1096
TEMP_FAILURE_RETRY(close(dir_fd));
1097
dir_fd = -1;
1098
free_plugin(getplugin(NULL));
928
closedir(dir);
929
dir = NULL;
1099
930
1100
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
932
if(p->pid != 0){
1112
943
while(plugin_list){
1113
944
fd_set rfds = rfds_all;
1114
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
946
if (select_ret == -1){
947
perror("select");
948
exitstatus = EXIT_FAILURE;
1118
949
goto fallback;
1119
950
}
1120
951
/* OK, now either a process completed, or something can be read
1121
952
from one of them */
1122
953
for(plugin *proc = plugin_list; proc != NULL;){
1123
954
/* Is this process completely done? */
1124
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1125
956
/* Only accept the plugin output if it exited cleanly */
1126
957
if(not WIFEXITED(proc->status)
1127
958
or WEXITSTATUS(proc->status) != 0){
1128
959
/* Bad exit by plugin */
1129
960
1130
961
if(debug){
1131
962
if(WIFEXITED(proc->status)){
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1135
965
WEXITSTATUS(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1142
970
} else if(WCOREDUMP(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1145
973
}
1146
974
}
1147
975
1148
976
/* Remove the plugin */
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1153
#endif
1154
#endif
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1157
before 2.16 */
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
1161
#endif
1162
#endif
1163
977
FD_CLR(proc->fd, &rfds_all);
978
1164
979
/* Block signal while modifying process_list */
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1166
(SIG_BLOCK,
1167
&sigchld_action.sa_mask,
1168
NULL));
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1169
981
if(ret < 0){
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
1172
984
goto fallback;
1173
985
}
1174
986
1177
989
proc = next_plugin;
1178
990
1179
991
/* We are done modifying process list, so unblock signal */
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
993
NULL);
1183
994
if(ret < 0){
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1186
997
goto fallback;
1187
998
}
1188
999
1198
1009
bool bret = print_out_password(proc->buffer,
1199
1010
proc->buffer_length);
1200
1011
if(not bret){
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1203
1014
}
1204
1015
goto fallback;
1205
1016
}
1206
1017
1207
1018
/* This process has not completed. Does it have any output? */
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1212
#endif
1213
#endif
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1215
warning from
1216
-Wconversion
1217
in GNU libc
1218
before
1219
2.16 */
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
1223
#endif
1224
#endif
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1225
1020
/* This process had nothing to say at this time */
1226
1021
proc = proc->next;
1227
1022
continue;
1228
1023
}
1229
1024
/* Before reading, make the process' data buffer large enough */
1230
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1029
perror("malloc");
1030
exitstatus = EXIT_FAILURE;
1236
1031
goto fallback;
1237
1032
}
1238
proc->buffer = new_buffer;
1239
1033
proc->buffer_size += BUFFER_SIZE;
1240
1034
}
1241
1035
/* Read from the process */
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1243
proc->buffer
1244
+ proc->buffer_length,
1245
BUFFER_SIZE));
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1037
BUFFER_SIZE);
1246
1038
if(sret < 0){
1247
1039
/* Read error from this process; ignore the error */
1248
1040
proc = proc->next;
1256
1048
}
1257
1049
}
1258
1050
}
1259
1260
1051
1052
1261
1053
fallback:
1262
1054
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1265
1056
/* Fallback if all plugins failed, none are found or an error
1266
1057
occured */
1267
1058
bool bret;
1275
1066
}
1276
1067
bret = print_out_password(passwordbuffer, len);
1277
1068
if(not bret){
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1280
1071
}
1281
1072
}
1282
1073
1283
1074
/* Restore old signal handler */
1284
1075
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1285
1076
if(ret == -1){
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1288
1079
}
1289
1080
1290
1081
if(custom_argv != NULL){
1294
1085
free(custom_argv);
1295
1086
}
1296
1087
1297
free(direntries);
1298
1299
if(dir_fd != -1){
1300
TEMP_FAILURE_RETRY(close(dir_fd));
1088
if(dir != NULL){
1089
closedir(dir);
1301
1090
}
1302
1091
1303
1092
/* Kill the processes */
1307
1096
ret = kill(p->pid, SIGTERM);
1308
1097
if(ret == -1 and errno != ESRCH){
1309
1098
/* Set-uid proccesses might not get closed */
1310
error(0, errno, "kill");
1099
perror("kill");
1311
1100
}
1312
1101
}
1313
1102
}
1314
1103
1315
1104
/* Wait for any remaining child processes to terminate */
1316
do {
1105
do{
1317
1106
ret = wait(NULL);
1318
1107
} while(ret >= 0);
1319
1108
if(errno != ECHILD){
1320
error(0, errno, "wait");
1109
perror("wait");
1321
1110
}
1322
1111
1323
1112
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0