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- Committer: Teddy Hogeborn
- Date: 2008-09-07 01:44:44 UTC
- mfrom: (24.1.93 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080907014444-cf4ilzndc0tbn8va
Merge & resolve.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct plugin;
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
96
89
size_t buffer_size;
97
90
size_t buffer_length;
98
91
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
92
volatile bool completed;
93
volatile int status;
101
94
struct plugin *next;
102
95
} plugin;
103
96
105
98
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
101
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
114
106
return p;
115
107
}
116
108
}
117
109
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
123
112
return NULL;
124
113
}
125
114
char *copy_name = NULL;
126
115
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
130
117
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
134
118
return NULL;
135
119
}
136
120
}
137
121
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
142
126
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
148
129
free(copy_name);
149
130
free(new_plugin);
150
errno = e;
151
131
return NULL;
152
132
}
153
133
new_plugin->argv[0] = copy_name;
154
134
new_plugin->argv[1] = NULL;
155
135
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
159
137
if(new_plugin->environ == NULL){
160
int e = errno;
161
138
free(copy_name);
162
139
free(new_plugin->argv);
163
140
free(new_plugin);
164
errno = e;
165
141
return NULL;
166
142
}
167
143
new_plugin->environ[0] = NULL;
172
148
}
173
149
174
150
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
151
static bool add_to_char_array(const char *new, char ***array,
177
152
int *len){
178
153
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
184
156
/* Malloc check */
185
if(new_array == NULL){
157
if(*array == NULL){
186
158
return false;
187
159
}
188
*array = new_array;
189
160
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
194
162
if(copy == NULL){
195
163
return false;
196
164
}
203
171
}
204
172
205
173
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
174
static bool add_argument(plugin *p, const char *arg){
208
175
if(p == NULL){
209
176
return false;
212
179
}
213
180
214
181
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
182
static bool add_environment(plugin *p, const char *def, bool replace){
217
183
if(p == NULL){
218
184
return false;
220
186
/* namelen = length of name of environment variable */
221
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
188
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
225
191
/* It already exists */
226
192
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
232
195
return false;
233
196
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
236
199
}
237
200
return true;
238
201
}
243
206
/*
244
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
245
208
* Descriptor Flags".
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
210
*/
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
212
{
213
int ret = fcntl(fd, F_GETFD, 0);
251
214
/* If reading the flags failed, return error indication now. */
252
215
if(ret < 0){
253
216
return ret;
254
217
}
255
218
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
220
}
259
221
260
222
261
223
/* Mark processes as completed when they exit, and save their exit
262
224
status. */
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
265
226
while(true){
266
227
plugin *proc = plugin_list;
267
228
int status;
271
232
break;
272
233
}
273
234
if(pid == -1){
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
235
if (errno != ECHILD){
236
perror("waitpid");
277
237
}
278
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
279
240
}
280
241
281
242
/* A child exited, find it in process_list */
287
248
continue;
288
249
}
289
250
proc->status = status;
290
proc->completed = 1;
251
proc->completed = true;
291
252
}
292
errno = old_errno;
293
253
}
294
254
295
255
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
298
257
ssize_t ret;
299
258
for(size_t written = 0; written < length; written += (size_t)ret){
300
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
307
266
}
308
267
309
268
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
269
static void free_plugin(plugin *plugin_node){
312
270
313
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
319
277
}
320
278
free(plugin_node->environ);
321
279
free(plugin_node->buffer);
322
280
323
281
/* Removes the plugin from the singly-linked list */
324
282
if(plugin_node == plugin_list){
325
283
/* First one - simple */
353
311
struct stat st;
354
312
fd_set rfds_all;
355
313
int ret, maxfd = 0;
356
ssize_t sret;
357
314
uid_t uid = 65534;
358
315
gid_t gid = 65534;
359
316
bool debug = false;
363
320
.sa_flags = SA_NOCLDSTOP };
364
321
char **custom_argv = NULL;
365
322
int custom_argc = 0;
366
int dir_fd;
367
323
368
324
/* Establish a signal handler */
369
325
sigemptyset(&sigchld_action.sa_mask);
370
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
371
327
if(ret == -1){
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
328
perror("sigaddset");
329
exitstatus = EXIT_FAILURE;
374
330
goto fallback;
375
331
}
376
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
377
333
if(ret == -1){
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
334
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
380
336
goto fallback;
381
337
}
382
338
414
370
.doc = "Group ID the plugins will run as", .group = 3 },
415
371
{ .name = "debug", .key = 132,
416
372
.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
373
{ .name = NULL }
427
374
};
428
375
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;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
switch (key) {
435
379
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;
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
441
389
}
442
390
}
443
errno = 0;
444
391
}
445
392
break;
446
393
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
449
399
}
450
400
break;
451
401
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;
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
473
421
}
474
422
break;
475
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
476
427
{
477
428
char *envdef = strchr(arg, ':');
478
429
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
430
break;
482
431
}
483
432
*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;
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
492
435
}
493
436
}
494
437
break;
495
438
case 'd': /* --disable */
496
{
439
if (arg != NULL){
497
440
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
501
443
}
444
p->disabled = true;
502
445
}
503
446
break;
504
447
case 'e': /* --enable */
505
{
448
if (arg != NULL){
506
449
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
510
452
}
453
p->disabled = false;
511
454
}
512
455
break;
513
456
case 128: /* --plugin-dir */
514
457
free(plugindir);
515
458
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
459
if(plugindir == NULL){
460
perror("strdup");
461
}
519
462
break;
520
463
case 129: /* --config-file */
521
464
/* This is already done by parse_opt_config_file() */
522
465
break;
523
466
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;
467
uid = (uid_t)strtol(arg, NULL, 10);
533
468
break;
534
469
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;
470
gid = (gid_t)strtol(arg, NULL, 10);
544
471
break;
545
472
case 132: /* --debug */
546
473
debug = true;
547
474
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
475
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
573
480
default:
574
481
return ARGP_ERR_UNKNOWN;
575
482
}
576
return errno; /* Set to 0 at start */
483
return 0;
577
484
}
578
485
579
486
/* This option parser is the same as parse_opt() above, except it
580
487
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){
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
586
492
case 'g': /* --global-options */
587
493
case 'G': /* --global-env */
588
494
case 'o': /* --options-for */
594
500
case 129: /* --config-file */
595
501
free(argfile);
596
502
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
503
if(argfile == NULL){
504
perror("strdup");
599
505
}
600
break;
506
break;
601
507
case 130: /* --userid */
602
508
case 131: /* --groupid */
603
509
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
510
case ARGP_KEY_ARG:
511
case ARGP_KEY_END:
608
512
break;
609
513
default:
610
514
return ARGP_ERR_UNKNOWN;
611
515
}
612
return errno;
516
return 0;
613
517
}
614
518
615
519
struct argp argp = { .options = options,
617
521
.args_doc = "",
618
522
.doc = "Mandos plugin runner -- Run plugins" };
619
523
620
/* Parse using parse_opt_config_file() in order to get the custom
524
/* Parse using the parse_opt_config_file in order to get the custom
621
525
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;
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
527
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
529
exitstatus = EXIT_FAILURE;
636
530
goto fallback;
637
531
}
638
532
640
534
argp.parser = parse_opt;
641
535
642
536
/* Open the configfile if available */
643
if(argfile == NULL){
537
if (argfile == NULL){
644
538
conffp = fopen(AFILE, "r");
645
539
} else {
646
540
conffp = fopen(argfile, "r");
647
}
541
}
648
542
if(conffp != NULL){
649
543
char *org_line = NULL;
650
544
char *p, *arg, *new_arg, *line;
651
545
size_t size = 0;
546
ssize_t sret;
652
547
const char whitespace_delims[] = " \r\t\f\v\n";
653
548
const char comment_delim[] = "#";
654
549
655
550
custom_argc = 1;
656
551
custom_argv = malloc(sizeof(char*) * 2);
657
552
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
553
perror("malloc");
554
exitstatus = EXIT_FAILURE;
660
555
goto fallback;
661
556
}
662
557
custom_argv[0] = argv[0];
663
558
custom_argv[1] = NULL;
664
559
665
560
/* for each line in the config file, strip whitespace and ignore
666
561
commented text */
667
562
while(true){
669
564
if(sret == -1){
670
565
break;
671
566
}
672
567
673
568
line = org_line;
674
569
arg = strsep(&line, comment_delim);
675
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
678
573
}
679
574
new_arg = strdup(p);
680
575
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
683
578
free(org_line);
684
579
goto fallback;
685
580
}
686
581
687
582
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
}
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
701
590
}
702
591
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
592
custom_argv[custom_argc] = NULL;
704
593
}
705
594
}
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
595
free(org_line);
715
596
} else {
716
597
/* Check for harmful errors and go to fallback. Other errors might
717
598
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
721
602
goto fallback;
722
603
}
723
604
}
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
726
607
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;
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
610
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
612
exitstatus = EXIT_FAILURE;
741
613
goto fallback;
742
614
}
743
615
}
744
616
745
617
/* Parse actual command line arguments, to let them override the
746
618
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;
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
761
623
goto fallback;
762
624
}
763
625
768
630
for(char **a = p->argv; *a != NULL; a++){
769
631
fprintf(stderr, "\tArg: %s\n", *a);
770
632
}
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
634
for(char **a = p->environ; *a != NULL; a++){
773
635
fprintf(stderr, "\t%s\n", *a);
774
636
}
775
637
}
776
638
}
777
639
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
}
640
/* Strip permissions down to nobody */
807
641
ret = setuid(uid);
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
642
if (ret == -1){
643
perror("setuid");
644
}
645
setgid(gid);
646
if (ret == -1){
647
perror("setgid");
648
}
649
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
656
if(dir == NULL){
657
perror("Could not open plugin dir");
658
exitstatus = EXIT_FAILURE;
659
goto fallback;
660
}
661
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
813
663
{
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
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
664
int dir_fd = dirfd(dir);
665
if(dir_fd >= 0){
666
ret = set_cloexec_flag(dir_fd);
667
if(ret < 0){
668
perror("set_cloexec_flag");
669
exitstatus = EXIT_FAILURE;
670
goto fallback;
671
}
844
672
}
845
673
}
846
674
848
676
849
677
/* Read and execute any executable in the plugin directory*/
850
678
while(true){
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
679
dirst = readdir(dir);
854
680
855
681
/* All directory entries have been processed */
856
682
if(dirst == NULL){
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
683
if (errno == EBADF){
684
perror("readdir");
685
exitstatus = EXIT_FAILURE;
860
686
goto fallback;
861
687
}
862
688
break;
868
694
{
869
695
bool bad_name = false;
870
696
871
const char * const bad_prefixes[] = { ".", "#", NULL };
697
const char const *bad_prefixes[] = { ".", "#", NULL };
872
698
873
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
699
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
874
700
".dpkg-old",
875
".dpkg-bak",
876
701
".dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pre = (const char **)bad_prefixes;
882
*pre != NULL; pre++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
702
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
886
703
size_t pre_len = strlen(*pre);
887
704
if((d_name_len >= pre_len)
888
705
and strncmp((dirst->d_name), *pre, pre_len) == 0){
897
714
if(bad_name){
898
715
continue;
899
716
}
900
#ifdef __GNUC__
901
#pragma GCC diagnostic push
902
#pragma GCC diagnostic ignored "-Wcast-qual"
903
#endif
904
for(const char **suf = (const char **)bad_suffixes;
905
*suf != NULL; suf++){
906
#ifdef __GNUC__
907
#pragma GCC diagnostic pop
908
#endif
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
909
718
size_t suf_len = strlen(*suf);
910
719
if((d_name_len >= suf_len)
911
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
720
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
912
721
== 0)){
913
722
if(debug){
914
723
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
923
732
continue;
924
733
}
925
734
}
926
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
928
#ifdef O_CLOEXEC
929
O_CLOEXEC
930
#else /* not O_CLOEXEC */
931
0
932
#endif /* not O_CLOEXEC */
933
);
934
if(plugin_fd == -1){
935
error(0, errno, "Could not open plugin");
936
continue;
735
736
char *filename;
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
937
741
}
938
#ifndef O_CLOEXEC
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
941
742
if(ret < 0){
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
continue;
945
}
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
948
if(ret == -1){
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
743
perror("asprintf");
951
744
continue;
952
745
}
953
746
747
ret = stat(filename, &st);
748
if (ret == -1){
749
perror("stat");
750
free(filename);
751
continue;
752
}
753
954
754
/* Ignore non-executable files */
955
if(not S_ISREG(st.st_mode)
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
957
0)) != 0)){
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
958
756
if(debug){
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
758
" with bad type or mode\n", filename);
962
759
}
963
TEMP_FAILURE_RETRY(close(plugin_fd));
760
free(filename);
964
761
continue;
965
762
}
966
763
967
764
plugin *p = getplugin(dirst->d_name);
968
765
if(p == NULL){
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
766
perror("getplugin");
767
free(filename);
971
768
continue;
972
769
}
973
770
if(p->disabled){
975
772
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
976
773
dirst->d_name);
977
774
}
978
TEMP_FAILURE_RETRY(close(plugin_fd));
775
free(filename);
979
776
continue;
980
777
}
981
778
{
984
781
if(g != NULL){
985
782
for(char **a = g->argv + 1; *a != NULL; a++){
986
783
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
784
perror("add_argument");
988
785
}
989
786
}
990
787
/* Add global environment variables */
991
788
for(char **e = g->environ; *e != NULL; e++){
992
789
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
790
perror("add_environment");
994
791
}
995
792
}
996
793
}
997
794
}
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
797
process, too. */
1000
798
if(p->environ[0] != NULL){
1001
799
for(char **e = environ; *e != NULL; e++){
1002
800
if(not add_environment(p, *e, false)){
1003
error(0, errno, "add_environment");
801
perror("add_environment");
1004
802
}
1005
803
}
1006
804
}
1007
805
1008
806
int pipefd[2];
1009
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1010
if(ret == -1){
1011
error(0, errno, "pipe");
1012
exitstatus = EX_OSERR;
807
ret = pipe(pipefd);
808
if (ret == -1){
809
perror("pipe");
810
exitstatus = EXIT_FAILURE;
1013
811
goto fallback;
1014
812
}
1015
813
/* Ask OS to automatic close the pipe on exec */
1016
814
ret = set_cloexec_flag(pipefd[0]);
1017
815
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
816
perror("set_cloexec_flag");
817
exitstatus = EXIT_FAILURE;
1020
818
goto fallback;
1021
819
}
1022
820
ret = set_cloexec_flag(pipefd[1]);
1023
821
if(ret < 0){
1024
error(0, errno, "set_cloexec_flag");
1025
exitstatus = EX_OSERR;
822
perror("set_cloexec_flag");
823
exitstatus = EXIT_FAILURE;
1026
824
goto fallback;
1027
825
}
1028
826
/* Block SIGCHLD until process is safely in process list */
1029
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1030
&sigchld_action.sa_mask,
1031
NULL));
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
828
if(ret < 0){
1033
error(0, errno, "sigprocmask");
1034
exitstatus = EX_OSERR;
829
perror("sigprocmask");
830
exitstatus = EXIT_FAILURE;
1035
831
goto fallback;
1036
832
}
1037
833
/* Starting a new process to be watched */
1038
pid_t pid;
1039
do {
1040
pid = fork();
1041
} while(pid == -1 and errno == EINTR);
834
pid_t pid = fork();
1042
835
if(pid == -1){
1043
error(0, errno, "fork");
1044
exitstatus = EX_OSERR;
836
perror("fork");
837
exitstatus = EXIT_FAILURE;
1045
838
goto fallback;
1046
839
}
1047
840
if(pid == 0){
1048
841
/* this is the child process */
1049
842
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
843
if(ret < 0){
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
844
perror("sigaction");
845
_exit(EXIT_FAILURE);
1053
846
}
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
847
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
848
if(ret < 0){
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
849
perror("sigprocmask");
850
_exit(EXIT_FAILURE);
1058
851
}
1059
852
1060
853
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
854
if(ret == -1){
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
855
perror("dup2");
856
_exit(EXIT_FAILURE);
1064
857
}
1065
858
1066
859
if(dirfd(dir) < 0){
1068
861
above and must now close it manually here. */
1069
862
closedir(dir);
1070
863
}
1071
if(fexecve(plugin_fd, p->argv,
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1075
_exit(EX_OSERR);
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
868
}
869
} else {
870
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
873
}
1076
874
}
1077
875
/* no return */
1078
876
}
1079
877
/* Parent process */
1080
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1081
pipe */
1082
TEMP_FAILURE_RETRY(close(plugin_fd));
878
close(pipefd[1]); /* Close unused write end of pipe */
879
free(filename);
1083
880
plugin *new_plugin = getplugin(dirst->d_name);
1084
if(new_plugin == NULL){
1085
error(0, errno, "getplugin");
1086
ret = (int)(TEMP_FAILURE_RETRY
1087
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1088
NULL)));
881
if (new_plugin == NULL){
882
perror("getplugin");
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1089
884
if(ret < 0){
1090
error(0, errno, "sigprocmask");
885
perror("sigprocmask");
1091
886
}
1092
exitstatus = EX_OSERR;
887
exitstatus = EXIT_FAILURE;
1093
888
goto fallback;
1094
889
}
1095
890
1098
893
1099
894
/* Unblock SIGCHLD so signal handler can be run if this process
1100
895
has already completed */
1101
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1102
&sigchld_action.sa_mask,
1103
NULL));
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1104
897
if(ret < 0){
1105
error(0, errno, "sigprocmask");
1106
exitstatus = EX_OSERR;
898
perror("sigprocmask");
899
exitstatus = EXIT_FAILURE;
1107
900
goto fallback;
1108
901
}
1109
902
1110
#if defined (__GNUC__) and defined (__GLIBC__)
1111
#if not __GLIBC_PREREQ(2, 16)
1112
#pragma GCC diagnostic push
1113
#pragma GCC diagnostic ignored "-Wsign-conversion"
1114
#endif
1115
#endif
1116
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1117
-Wconversion in GNU libc
1118
before 2.16 */
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic pop
1122
#endif
1123
#endif
903
FD_SET(new_plugin->fd, &rfds_all);
1124
904
1125
if(maxfd < new_plugin->fd){
905
if (maxfd < new_plugin->fd){
1126
906
maxfd = new_plugin->fd;
1127
907
}
908
1128
909
}
1129
910
1130
TEMP_FAILURE_RETRY(closedir(dir));
911
closedir(dir);
1131
912
dir = NULL;
1132
free_plugin(getplugin(NULL));
1133
913
1134
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
1135
915
if(p->pid != 0){
1136
916
break;
1141
921
free_plugin_list();
1142
922
}
1143
923
}
1144
924
1145
925
/* Main loop while running plugins exist */
1146
926
while(plugin_list){
1147
927
fd_set rfds = rfds_all;
1148
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1149
if(select_ret == -1 and errno != EINTR){
1150
error(0, errno, "select");
1151
exitstatus = EX_OSERR;
929
if (select_ret == -1){
930
perror("select");
931
exitstatus = EXIT_FAILURE;
1152
932
goto fallback;
1153
933
}
1154
934
/* OK, now either a process completed, or something can be read
1155
935
from one of them */
1156
936
for(plugin *proc = plugin_list; proc != NULL;){
1157
937
/* Is this process completely done? */
1158
if(proc->completed and proc->eof){
938
if(proc->eof and proc->completed){
1159
939
/* Only accept the plugin output if it exited cleanly */
1160
940
if(not WIFEXITED(proc->status)
1161
941
or WEXITSTATUS(proc->status) != 0){
1162
942
/* Bad exit by plugin */
1163
943
1164
944
if(debug){
1165
945
if(WIFEXITED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1167
" status %d\n", proc->name,
1168
(intmax_t) (proc->pid),
946
fprintf(stderr, "Plugin %u exited with status %d\n",
947
(unsigned int) (proc->pid),
1169
948
WEXITSTATUS(proc->status));
1170
} else if(WIFSIGNALED(proc->status)){
1171
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1172
" signal %d: %s\n", proc->name,
1173
(intmax_t) (proc->pid),
1174
WTERMSIG(proc->status),
1175
strsignal(WTERMSIG(proc->status)));
949
} else if(WIFSIGNALED(proc->status)) {
950
fprintf(stderr, "Plugin %u killed by signal %d\n",
951
(unsigned int) (proc->pid),
952
WTERMSIG(proc->status));
1176
953
} else if(WCOREDUMP(proc->status)){
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1178
" core\n", proc->name, (intmax_t) (proc->pid));
954
fprintf(stderr, "Plugin %d dumped core\n",
955
(unsigned int) (proc->pid));
1179
956
}
1180
957
}
1181
958
1182
959
/* Remove the plugin */
1183
#if defined (__GNUC__) and defined (__GLIBC__)
1184
#if not __GLIBC_PREREQ(2, 16)
1185
#pragma GCC diagnostic push
1186
#pragma GCC diagnostic ignored "-Wsign-conversion"
1187
#endif
1188
#endif
1189
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1190
-Wconversion in GNU libc
1191
before 2.16 */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic pop
1195
#endif
1196
#endif
1197
960
FD_CLR(proc->fd, &rfds_all);
961
1198
962
/* Block signal while modifying process_list */
1199
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1200
(SIG_BLOCK,
1201
&sigchld_action.sa_mask,
1202
NULL));
1203
if(ret < 0){
1204
error(0, errno, "sigprocmask");
1205
exitstatus = EX_OSERR;
1206
goto fallback;
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
964
if(ret < 0){
965
perror("sigprocmask");
966
exitstatus = EXIT_FAILURE;
967
goto fallback;
968
}
969
970
/* We are done modifying process list, so unblock signal */
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
972
NULL);
973
if(ret < 0){
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
1207
981
}
1208
982
1209
983
plugin *next_plugin = proc->next;
1210
984
free_plugin(proc);
1211
985
proc = next_plugin;
1212
1213
/* We are done modifying process list, so unblock signal */
1214
ret = (int)(TEMP_FAILURE_RETRY
1215
(sigprocmask(SIG_UNBLOCK,
1216
&sigchld_action.sa_mask, NULL)));
1217
if(ret < 0){
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
1220
goto fallback;
1221
}
1222
1223
if(plugin_list == NULL){
1224
break;
1225
}
1226
1227
986
continue;
1228
987
}
1229
988
1230
989
/* This process exited nicely, so print its buffer */
1231
990
1232
991
bool bret = print_out_password(proc->buffer,
1233
992
proc->buffer_length);
1234
993
if(not bret){
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
1237
996
}
1238
997
goto fallback;
1239
998
}
1240
999
1241
1000
/* This process has not completed. Does it have any output? */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic push
1245
#pragma GCC diagnostic ignored "-Wsign-conversion"
1246
#endif
1247
#endif
1248
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1249
warning from
1250
-Wconversion
1251
in GNU libc
1252
before
1253
2.16 */
1254
#if defined (__GNUC__) and defined (__GLIBC__)
1255
#if not __GLIBC_PREREQ(2, 16)
1256
#pragma GCC diagnostic pop
1257
#endif
1258
#endif
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1259
1002
/* This process had nothing to say at this time */
1260
1003
proc = proc->next;
1261
1004
continue;
1262
1005
}
1263
1006
/* Before reading, make the process' data buffer large enough */
1264
1007
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1265
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1266
+ (size_t) BUFFER_SIZE);
1267
if(new_buffer == NULL){
1268
error(0, errno, "malloc");
1269
exitstatus = EX_OSERR;
1008
proc->buffer = realloc(proc->buffer, proc->buffer_size
1009
+ (size_t) BUFFER_SIZE);
1010
if (proc->buffer == NULL){
1011
perror("malloc");
1012
exitstatus = EXIT_FAILURE;
1270
1013
goto fallback;
1271
1014
}
1272
proc->buffer = new_buffer;
1273
1015
proc->buffer_size += BUFFER_SIZE;
1274
1016
}
1275
1017
/* Read from the process */
1276
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1277
proc->buffer
1278
+ proc->buffer_length,
1279
BUFFER_SIZE));
1280
if(sret < 0){
1018
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1019
BUFFER_SIZE);
1020
if(ret < 0){
1281
1021
/* Read error from this process; ignore the error */
1282
1022
proc = proc->next;
1283
1023
continue;
1284
1024
}
1285
if(sret == 0){
1025
if(ret == 0){
1286
1026
/* got EOF */
1287
1027
proc->eof = true;
1288
1028
} else {
1289
proc->buffer_length += (size_t) sret;
1029
proc->buffer_length += (size_t) ret;
1290
1030
}
1291
1031
}
1292
1032
}
1293
1294
1033
1034
1295
1035
fallback:
1296
1036
1297
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1298
and exitstatus != EX_OK)){
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1299
1038
/* Fallback if all plugins failed, none are found or an error
1300
1039
occured */
1301
1040
bool bret;
1309
1048
}
1310
1049
bret = print_out_password(passwordbuffer, len);
1311
1050
if(not bret){
1312
error(0, errno, "print_out_password");
1313
exitstatus = EX_IOERR;
1051
perror("print_out_password");
1052
exitstatus = EXIT_FAILURE;
1314
1053
}
1315
1054
}
1316
1055
1317
1056
/* Restore old signal handler */
1318
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1319
1058
if(ret == -1){
1320
error(0, errno, "sigaction");
1321
exitstatus = EX_OSERR;
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1322
1061
}
1323
1062
1324
1063
if(custom_argv != NULL){
1325
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1326
1065
free(*arg);
1332
1071
closedir(dir);
1333
1072
}
1334
1073
1335
/* Kill the processes */
1074
/* Free the process list and kill the processes */
1336
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
1076
if(p->pid != 0){
1338
1077
close(p->fd);
1339
1078
ret = kill(p->pid, SIGTERM);
1340
1079
if(ret == -1 and errno != ESRCH){
1341
1080
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1081
perror("kill");
1343
1082
}
1344
1083
}
1345
1084
}
1346
1085
1347
1086
/* Wait for any remaining child processes to terminate */
1348
do {
1087
do{
1349
1088
ret = wait(NULL);
1350
1089
} while(ret >= 0);
1351
1090
if(errno != ECHILD){
1352
error(0, errno, "wait");
1091
perror("wait");
1353
1092
}
1354
1093
1355
1094
free_plugin_list();
1356
1095
1357
1096
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0