To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 237.7.367
- compare with another revision
- download diff
- download tarball
- view history from revision 237.7.367
- Committer: Teddy Hogeborn
- Date: 2016-03-05 20:11:10 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 335.
- Revision ID: teddy@recompile.se-20160305201110-6f7nws77k1h96e8k
errno is of type int, not error_t
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges,
lower_privileges_permanently, bring_up_interface,
take_down_interface, ): Change return type and all errno-containing
variables to type "int".
(get_flags): Change all errno-containing variables to type "int".
(main): Change all errno-containing variables to type "int", except
for values which are explicitly of type error_t.
* plugins.d/mandos-client.c (raise_privileges,
raise_privileges_permanently, lower_privileges,
lower_privileges_permanently, bring_up_interface,
take_down_interface, ): Change return type and all errno-containing
variables to type "int".
(get_flags): Change all errno-containing variables to type "int".
(main): Change all errno-containing variables to type "int", except
for values which are explicitly of type error_t.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 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@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
O_CLOEXEC, pipe2() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
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() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
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() */
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
*/
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
62
63
#include <signal.h> /* struct sigaction, sigemptyset(),
63
64
sigaddset(), sigaction(),
64
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
66
68
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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() */
68
75
69
76
#define BUFFER_SIZE 256
70
77
71
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
72
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
81
74
82
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
84
77
85
typedef struct plugin{
78
86
char *name; /* can be NULL or any plugin name */
81
89
char **environ;
82
90
int envc;
83
91
bool disabled;
84
92
85
93
/* Variables used for running processes*/
86
94
pid_t pid;
87
95
int fd;
89
97
size_t buffer_size;
90
98
size_t buffer_length;
91
99
bool eof;
92
volatile bool completed;
93
volatile int status;
100
volatile sig_atomic_t completed;
101
int status;
94
102
struct plugin *next;
95
103
} plugin;
96
104
98
106
99
107
/* Gets an existing plugin based on name,
100
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
101
110
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
111
/* Check for existing plugin with that name */
103
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
113
if((p->name == name)
105
114
or (p->name and name and (strcmp(p->name, name) == 0))){
107
116
}
108
117
}
109
118
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
111
123
if(new_plugin == NULL){
112
124
return NULL;
113
125
}
114
126
char *copy_name = NULL;
115
127
if(name != NULL){
116
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
117
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
118
135
return NULL;
119
136
}
120
137
}
121
138
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
126
143
127
new_plugin->argv = malloc(sizeof(char *) * 2);
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
128
147
if(new_plugin->argv == NULL){
148
int e = errno;
129
149
free(copy_name);
130
150
free(new_plugin);
151
errno = e;
131
152
return NULL;
132
153
}
133
154
new_plugin->argv[0] = copy_name;
134
155
new_plugin->argv[1] = NULL;
135
156
136
new_plugin->environ = malloc(sizeof(char *));
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
137
160
if(new_plugin->environ == NULL){
161
int e = errno;
138
162
free(copy_name);
139
163
free(new_plugin->argv);
140
164
free(new_plugin);
165
errno = e;
141
166
return NULL;
142
167
}
143
168
new_plugin->environ[0] = NULL;
148
173
}
149
174
150
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
151
177
static bool add_to_char_array(const char *new, char ***array,
152
178
int *len){
153
179
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
156
185
/* Malloc check */
157
if(*array == NULL){
186
if(new_array == NULL){
158
187
return false;
159
188
}
189
*array = new_array;
160
190
/* Make a copy of the new string */
161
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
162
195
if(copy == NULL){
163
196
return false;
164
197
}
171
204
}
172
205
173
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
174
208
static bool add_argument(plugin *p, const char *arg){
175
209
if(p == NULL){
176
210
return false;
179
213
}
180
214
181
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
182
217
static bool add_environment(plugin *p, const char *def, bool replace){
183
218
if(p == NULL){
184
219
return false;
186
221
/* namelen = length of name of environment variable */
187
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
223
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
191
226
/* It already exists */
192
227
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
195
233
return false;
196
234
}
197
*e = new;
198
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
199
237
}
200
238
return true;
201
239
}
203
241
return add_to_char_array(def, &(p->environ), &(p->envc));
204
242
}
205
243
244
#ifndef O_CLOEXEC
206
245
/*
207
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
247
* Descriptor Flags".
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
249
*/
250
__attribute__((warn_unused_result))
211
251
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
253
/* If reading the flags failed, return error indication now. */
214
254
if(ret < 0){
215
255
return ret;
216
256
}
217
257
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
219
260
}
261
#endif /* not O_CLOEXEC */
220
262
221
263
222
264
/* Mark processes as completed when they exit, and save their exit
223
265
status. */
224
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
225
268
while(true){
226
269
plugin *proc = plugin_list;
227
270
int status;
231
274
break;
232
275
}
233
276
if(pid == -1){
234
if(errno != ECHILD){
235
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
236
280
}
237
/* No child processes */
238
break;
281
error(0, errno, "waitpid");
239
282
}
240
283
241
284
/* A child exited, find it in process_list */
247
290
continue;
248
291
}
249
292
proc->status = status;
250
proc->completed = true;
293
proc->completed = 1;
251
294
}
295
errno = old_errno;
252
296
}
253
297
254
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
255
300
static bool print_out_password(const char *buffer, size_t length){
256
301
ssize_t ret;
257
302
for(size_t written = 0; written < length; written += (size_t)ret){
265
310
}
266
311
267
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
268
314
static void free_plugin(plugin *plugin_node){
269
315
270
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
276
322
}
277
323
free(plugin_node->environ);
278
324
free(plugin_node->buffer);
279
325
280
326
/* Removes the plugin from the singly-linked list */
281
327
if(plugin_node == plugin_list){
282
328
/* First one - simple */
302
348
303
349
int main(int argc, char *argv[]){
304
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
305
352
char *argfile = NULL;
306
353
FILE *conffp;
307
size_t d_name_len;
308
DIR *dir = NULL;
309
struct dirent *dirst;
354
struct dirent **direntries = NULL;
310
355
struct stat st;
311
356
fd_set rfds_all;
312
int ret, numchars, maxfd = 0;
357
int ret, maxfd = 0;
313
358
ssize_t sret;
314
intmax_t tmpmax;
315
359
uid_t uid = 65534;
316
360
gid_t gid = 65534;
317
361
bool debug = false;
321
365
.sa_flags = SA_NOCLDSTOP };
322
366
char **custom_argv = NULL;
323
367
int custom_argc = 0;
368
int dir_fd = -1;
324
369
325
370
/* Establish a signal handler */
326
371
sigemptyset(&sigchld_action.sa_mask);
327
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
373
if(ret == -1){
329
perror("sigaddset");
330
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
331
376
goto fallback;
332
377
}
333
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
379
if(ret == -1){
335
perror("sigaction");
336
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
337
382
goto fallback;
338
383
}
339
384
371
416
.doc = "Group ID the plugins will run as", .group = 3 },
372
417
{ .name = "debug", .key = 132,
373
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
374
432
{ .name = NULL }
375
433
};
376
434
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
379
switch(key) {
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
380
441
case 'g': /* --global-options */
381
if(arg != NULL){
382
char *p;
383
while((p = strsep(&arg, ",")) != NULL){
384
if(p[0] == '\0'){
385
continue;
386
}
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
390
447
}
391
448
}
449
errno = 0;
392
450
}
393
451
break;
394
452
case 'G': /* --global-env */
395
if(arg == NULL){
396
break;
397
}
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
400
455
}
401
456
break;
402
457
case 'o': /* --options-for */
403
if(arg != NULL){
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
406
break;
407
}
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
410
break;
411
}
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
422
479
}
423
480
break;
424
481
case 'E': /* --env-for */
425
if(arg == NULL){
426
break;
427
}
428
482
{
429
483
char *envdef = strchr(arg, ':');
430
484
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
431
487
break;
432
488
}
433
489
*envdef = '\0';
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
490
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
436
498
}
437
499
}
438
500
break;
439
501
case 'd': /* --disable */
440
if(arg != NULL){
502
{
441
503
plugin *p = getplugin(arg);
442
if(p == NULL){
443
return ARGP_ERR_UNKNOWN;
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
444
507
}
445
p->disabled = true;
446
508
}
447
509
break;
448
510
case 'e': /* --enable */
449
if(arg != NULL){
511
{
450
512
plugin *p = getplugin(arg);
451
if(p == NULL){
452
return ARGP_ERR_UNKNOWN;
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
453
516
}
454
p->disabled = false;
455
517
}
456
518
break;
457
519
case 128: /* --plugin-dir */
458
520
free(plugindir);
459
521
plugindir = strdup(arg);
460
if(plugindir == NULL){
461
perror("strdup");
462
}
522
if(plugindir != NULL){
523
errno = 0;
524
}
463
525
break;
464
526
case 129: /* --config-file */
465
527
/* This is already done by parse_opt_config_file() */
466
528
break;
467
529
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
473
} else {
474
uid = (uid_t)tmpmax;
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
475
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
476
539
break;
477
540
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
485
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
486
550
break;
487
551
case 132: /* --debug */
488
552
debug = true;
489
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
490
575
/*
491
576
* When adding more options before this line, remember to also add a
492
577
* "case" to the "parse_opt_config_file" function below.
495
580
/* Cryptsetup always passes an argument, which is an empty
496
581
string if "none" was specified in /etc/crypttab. So if
497
582
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
583
if(arg[0] == '\0'){
584
break;
500
585
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
586
default:
505
587
return ARGP_ERR_UNKNOWN;
506
588
}
507
return 0;
589
return errno; /* Set to 0 at start */
508
590
}
509
591
510
592
/* This option parser is the same as parse_opt() above, except it
511
593
ignores everything but the --config-file option. */
512
594
error_t parse_opt_config_file(int key, char *arg,
513
595
__attribute__((unused))
514
struct argp_state *state) {
515
switch(key) {
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
516
599
case 'g': /* --global-options */
517
600
case 'G': /* --global-env */
518
601
case 'o': /* --options-for */
524
607
case 129: /* --config-file */
525
608
free(argfile);
526
609
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
610
if(argfile != NULL){
611
errno = 0;
529
612
}
530
break;
613
break;
531
614
case 130: /* --userid */
532
615
case 131: /* --groupid */
533
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
534
621
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
622
break;
537
623
default:
538
624
return ARGP_ERR_UNKNOWN;
539
625
}
540
return 0;
626
return errno;
541
627
}
542
628
543
629
struct argp argp = { .options = options,
547
633
548
634
/* Parse using parse_opt_config_file() in order to get the custom
549
635
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
554
650
goto fallback;
555
651
}
556
652
562
658
conffp = fopen(AFILE, "r");
563
659
} else {
564
660
conffp = fopen(argfile, "r");
565
}
661
}
566
662
if(conffp != NULL){
567
663
char *org_line = NULL;
568
664
char *p, *arg, *new_arg, *line;
569
665
size_t size = 0;
570
666
const char whitespace_delims[] = " \r\t\f\v\n";
571
667
const char comment_delim[] = "#";
572
668
573
669
custom_argc = 1;
574
670
custom_argv = malloc(sizeof(char*) * 2);
575
671
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
578
674
goto fallback;
579
675
}
580
676
custom_argv[0] = argv[0];
581
677
custom_argv[1] = NULL;
582
678
583
679
/* for each line in the config file, strip whitespace and ignore
584
680
commented text */
585
681
while(true){
587
683
if(sret == -1){
588
684
break;
589
685
}
590
686
591
687
line = org_line;
592
688
arg = strsep(&line, comment_delim);
593
689
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
692
}
597
693
new_arg = strdup(p);
598
694
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
601
697
free(org_line);
602
698
goto fallback;
603
699
}
604
700
605
701
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
613
714
}
614
715
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
716
custom_argv[custom_argc] = NULL;
616
717
}
617
718
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
618
727
free(org_line);
619
728
} else {
620
729
/* Check for harmful errors and go to fallback. Other errors might
621
730
not affect opening plugins */
622
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
625
734
goto fallback;
626
735
}
627
736
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
630
739
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
636
754
goto fallback;
637
755
}
638
756
}
639
757
640
758
/* Parse actual command line arguments, to let them override the
641
759
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
792
}
647
793
}
648
794
649
795
if(debug){
660
806
}
661
807
}
662
808
663
/* Strip permissions down to nobody */
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
664
838
ret = setuid(uid);
665
839
if(ret == -1){
666
perror("setuid");
667
}
668
setgid(gid);
669
if(ret == -1){
670
perror("setgid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
686
844
{
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
694
889
}
695
890
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
696
901
}
697
902
698
903
FD_ZERO(&rfds_all);
699
904
700
905
/* Read and execute any executable in the plugin directory*/
701
while(true){
702
dirst = readdir(dir);
703
704
/* All directory entries have been processed */
705
if(dirst == NULL){
706
if(errno == EBADF){
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
709
goto fallback;
710
}
711
break;
712
}
713
714
d_name_len = strlen(dirst->d_name);
715
716
/* Ignore dotfiles, backup files and other junk */
717
{
718
bool bad_name = false;
719
720
const char const *bad_prefixes[] = { ".", "#", NULL };
721
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
".dpkg-old",
724
".dpkg-bak",
725
".dpkg-divert", NULL };
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
size_t pre_len = strlen(*pre);
728
if((d_name_len >= pre_len)
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
730
if(debug){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad prefix %s\n", dirst->d_name, *pre);
733
}
734
bad_name = true;
735
break;
736
}
737
}
738
if(bad_name){
739
continue;
740
}
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
size_t suf_len = strlen(*suf);
743
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
745
== 0)){
746
if(debug){
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
748
" with bad suffix %s\n", dirst->d_name, *suf);
749
}
750
bad_name = true;
751
break;
752
}
753
}
754
755
if(bad_name){
756
continue;
757
}
758
}
759
760
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
766
if(ret < 0){
767
perror("asprintf");
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
768
912
continue;
769
913
}
770
771
ret = stat(filename, &st);
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
772
915
if(ret == -1){
773
perror("stat");
774
free(filename);
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
775
919
continue;
776
920
}
777
921
778
922
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
780
926
if(debug){
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
" with bad type or mode\n", filename);
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
783
931
}
784
free(filename);
932
close(plugin_fd);
933
free(direntries[i]);
785
934
continue;
786
935
}
787
936
788
plugin *p = getplugin(dirst->d_name);
937
plugin *p = getplugin(direntries[i]->d_name);
789
938
if(p == NULL){
790
perror("getplugin");
791
free(filename);
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
792
942
continue;
793
943
}
794
944
if(p->disabled){
795
945
if(debug){
796
946
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
797
dirst->d_name);
947
direntries[i]->d_name);
798
948
}
799
free(filename);
949
close(plugin_fd);
950
free(direntries[i]);
800
951
continue;
801
952
}
802
953
{
805
956
if(g != NULL){
806
957
for(char **a = g->argv + 1; *a != NULL; a++){
807
958
if(not add_argument(p, *a)){
808
perror("add_argument");
959
error(0, errno, "add_argument");
809
960
}
810
961
}
811
962
/* Add global environment variables */
812
963
for(char **e = g->environ; *e != NULL; e++){
813
964
if(not add_environment(p, *e, false)){
814
perror("add_environment");
965
error(0, errno, "add_environment");
815
966
}
816
967
}
817
968
}
818
969
}
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
821
process, too. */
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
822
972
if(p->environ[0] != NULL){
823
973
for(char **e = environ; *e != NULL; e++){
824
974
if(not add_environment(p, *e, false)){
825
perror("add_environment");
975
error(0, errno, "add_environment");
826
976
}
827
977
}
828
978
}
829
979
830
980
int pipefd[2];
831
ret = pipe(pipefd);
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
832
986
if(ret == -1){
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
835
goto fallback;
836
}
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
837
1002
/* Ask OS to automatic close the pipe on exec */
838
1003
ret = set_cloexec_flag(pipefd[0]);
839
1004
if(ret < 0){
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
842
1010
goto fallback;
843
1011
}
844
1012
ret = set_cloexec_flag(pipefd[1]);
845
1013
if(ret < 0){
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
848
1019
goto fallback;
849
1020
}
1021
#endif /* not O_CLOEXEC */
850
1022
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
852
1026
if(ret < 0){
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
855
1030
goto fallback;
856
1031
}
857
1032
/* Starting a new process to be watched */
858
pid_t pid = fork();
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
859
1037
if(pid == -1){
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
862
1045
goto fallback;
863
1046
}
864
1047
if(pid == 0){
865
1048
/* this is the child process */
866
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
1050
if(ret < 0){
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
870
1053
}
871
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
1055
if(ret < 0){
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
875
1058
}
876
1059
877
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
1061
if(ret == -1){
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
881
1064
}
882
1065
883
if(dirfd(dir) < 0){
884
/* If dir has no file descriptor, we could not set FD_CLOEXEC
885
above and must now close it manually here. */
886
closedir(dir);
887
}
888
if(p->environ[0] == NULL){
889
if(execv(filename, p->argv) < 0){
890
perror("execv");
891
_exit(EXIT_FAILURE);
892
}
893
} else {
894
if(execve(filename, p->argv, p->environ) < 0){
895
perror("execve");
896
_exit(EXIT_FAILURE);
897
}
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
898
1072
}
899
1073
/* no return */
900
1074
}
901
1075
/* Parent process */
902
1076
close(pipefd[1]); /* Close unused write end of pipe */
903
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
905
1079
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
908
1084
if(ret < 0){
909
perror("sigprocmask");
1085
error(0, errno, "sigprocmask");
910
1086
}
911
exitstatus = EXIT_FAILURE;
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
912
1089
goto fallback;
913
1090
}
1091
free(direntries[i]);
914
1092
915
1093
new_plugin->pid = pid;
916
1094
new_plugin->fd = pipefd[0];
917
1095
918
1096
/* Unblock SIGCHLD so signal handler can be run if this process
919
1097
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
921
1101
if(ret < 0){
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
924
1104
goto fallback;
925
1105
}
926
1106
931
1111
}
932
1112
}
933
1113
934
closedir(dir);
935
dir = NULL;
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
936
1119
937
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
938
1121
if(p->pid != 0){
949
1132
while(plugin_list){
950
1133
fd_set rfds = rfds_all;
951
1134
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
953
perror("select");
954
exitstatus = EXIT_FAILURE;
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
955
1138
goto fallback;
956
1139
}
957
1140
/* OK, now either a process completed, or something can be read
958
1141
from one of them */
959
1142
for(plugin *proc = plugin_list; proc != NULL;){
960
1143
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
1144
if(proc->completed and proc->eof){
962
1145
/* Only accept the plugin output if it exited cleanly */
963
1146
if(not WIFEXITED(proc->status)
964
1147
or WEXITSTATUS(proc->status) != 0){
965
1148
/* Bad exit by plugin */
966
1149
967
1150
if(debug){
968
1151
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
971
1155
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(proc->status)));
976
1162
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(intmax_t) (proc->pid));
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
979
1165
}
980
1166
}
981
1167
982
1168
/* Remove the plugin */
983
1169
FD_CLR(proc->fd, &rfds_all);
984
1170
985
1171
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
987
1176
if(ret < 0){
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
990
1179
goto fallback;
991
1180
}
992
1181
995
1184
proc = next_plugin;
996
1185
997
1186
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
999
NULL);
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
1000
1190
if(ret < 0){
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1003
1193
goto fallback;
1004
1194
}
1005
1195
1015
1205
bool bret = print_out_password(proc->buffer,
1016
1206
proc->buffer_length);
1017
1207
if(not bret){
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
1020
1210
}
1021
1211
goto fallback;
1022
1212
}
1029
1219
}
1030
1220
/* Before reading, make the process' data buffer large enough */
1031
1221
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1035
perror("malloc");
1036
exitstatus = EXIT_FAILURE;
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
1037
1227
goto fallback;
1038
1228
}
1229
proc->buffer = new_buffer;
1039
1230
proc->buffer_size += BUFFER_SIZE;
1040
1231
}
1041
1232
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1043
BUFFER_SIZE);
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1044
1237
if(sret < 0){
1045
1238
/* Read error from this process; ignore the error */
1046
1239
proc = proc->next;
1054
1247
}
1055
1248
}
1056
1249
}
1057
1058
1250
1251
1059
1252
fallback:
1060
1253
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1062
1256
/* Fallback if all plugins failed, none are found or an error
1063
1257
occured */
1064
1258
bool bret;
1072
1266
}
1073
1267
bret = print_out_password(passwordbuffer, len);
1074
1268
if(not bret){
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
1077
1271
}
1078
1272
}
1079
1273
1080
1274
/* Restore old signal handler */
1081
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
1276
if(ret == -1){
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
1085
1279
}
1086
1280
1087
1281
if(custom_argv != NULL){
1091
1285
free(custom_argv);
1092
1286
}
1093
1287
1094
if(dir != NULL){
1095
closedir(dir);
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1096
1292
}
1097
1293
1098
1294
/* Kill the processes */
1102
1298
ret = kill(p->pid, SIGTERM);
1103
1299
if(ret == -1 and errno != ESRCH){
1104
1300
/* Set-uid proccesses might not get closed */
1105
perror("kill");
1301
error(0, errno, "kill");
1106
1302
}
1107
1303
}
1108
1304
}
1109
1305
1110
1306
/* Wait for any remaining child processes to terminate */
1111
do{
1307
do {
1112
1308
ret = wait(NULL);
1113
1309
} while(ret >= 0);
1114
1310
if(errno != ECHILD){
1115
perror("wait");
1311
error(0, errno, "wait");
1116
1312
}
1117
1313
1118
1314
free_plugin_list();
1119
1315
1120
1316
free(plugindir);
1317
free(pluginhelperdir);
1121
1318
free(argfile);
1122
1319
1123
1320
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0