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- Committer: Teddy Hogeborn
- Date: 2008-09-02 13:04:42 UTC
- Revision ID: teddy@fukt.bsnet.se-20080902130442-ytnjsmllaph18e20
* plugin-runner.xml (PLUGINS/WRITING PLUGINS): New section.
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
(BUGS): Commented out. There are no bugs.
(EXAMPLE): Added lots of examples.
(SECURITY): Added text.
(SEE ALSO): Added "crypttab(5)" and "execve(2)".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- 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
asprintf(), 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 */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), 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() */
40
WEXITSTATUS() */
43
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
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
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
104
97
static plugin *plugin_list = NULL;
105
98
106
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
107
100
or if none is found, creates a new one */
108
101
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
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))){
113
106
return p;
114
107
}
115
108
}
116
109
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
122
112
return NULL;
123
113
}
124
114
char *copy_name = NULL;
125
115
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
129
117
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
118
return NULL;
134
119
}
135
120
}
136
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
141
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
147
129
free(copy_name);
148
130
free(new_plugin);
149
errno = e;
150
131
return NULL;
151
132
}
152
133
new_plugin->argv[0] = copy_name;
153
134
new_plugin->argv[1] = NULL;
154
135
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
158
137
if(new_plugin->environ == NULL){
159
int e = errno;
160
138
free(copy_name);
161
139
free(new_plugin->argv);
162
140
free(new_plugin);
163
errno = e;
164
141
return NULL;
165
142
}
166
143
new_plugin->environ[0] = NULL;
171
148
}
172
149
173
150
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
151
static bool add_to_char_array(const char *new, char ***array,
176
152
int *len){
177
153
/* Resize the pointed-to array to hold one more pointer */
178
char **new_array = NULL;
179
do {
180
new_array = realloc(*array, sizeof(char *)
181
* (size_t) ((*len) + 2));
182
} while(new_array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
183
156
/* Malloc check */
184
if(new_array == NULL){
157
if(*array == NULL){
185
158
return false;
186
159
}
187
*array = new_array;
188
160
/* Make a copy of the new string */
189
char *copy;
190
do {
191
copy = strdup(new);
192
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
193
162
if(copy == NULL){
194
163
return false;
195
164
}
202
171
}
203
172
204
173
/* Add to a plugin's argument vector */
205
__attribute__((nonnull(2)))
206
174
static bool add_argument(plugin *p, const char *arg){
207
175
if(p == NULL){
208
176
return false;
211
179
}
212
180
213
181
/* Add to a plugin's environment */
214
__attribute__((nonnull(2)))
215
182
static bool add_environment(plugin *p, const char *def, bool replace){
216
183
if(p == NULL){
217
184
return false;
219
186
/* namelen = length of name of environment variable */
220
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
221
188
/* Search for this environment variable */
222
for(char **envdef = p->environ; *envdef != NULL; envdef++){
223
if(strncmp(*envdef, def, namelen + 1) == 0){
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
224
191
/* It already exists */
225
192
if(replace){
226
char *new_envdef;
227
do {
228
new_envdef = realloc(*envdef, strlen(def) + 1);
229
} while(new_envdef == NULL and errno == EINTR);
230
if(new_envdef == NULL){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
231
195
return false;
232
196
}
233
*envdef = new_envdef;
234
strcpy(*envdef, def);
197
*e = new;
198
strcpy(*e, def);
235
199
}
236
200
return true;
237
201
}
242
206
/*
243
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
244
208
* Descriptor Flags".
245
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
210
*/
247
static int set_cloexec_flag(int fd){
248
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);
249
214
/* If reading the flags failed, return error indication now. */
250
215
if(ret < 0){
251
216
return ret;
252
217
}
253
218
/* Store modified flag word in the descriptor. */
254
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
255
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
220
}
257
221
258
222
259
223
/* Mark processes as completed when they exit, and save their exit
260
224
status. */
261
static void handle_sigchld(__attribute__((unused)) int sig){
262
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
263
226
while(true){
264
227
plugin *proc = plugin_list;
265
228
int status;
269
232
break;
270
233
}
271
234
if(pid == -1){
272
if(errno == ECHILD){
273
/* No child processes */
274
break;
235
if (errno != ECHILD){
236
perror("waitpid");
275
237
}
276
error(0, errno, "waitpid");
238
/* No child processes */
239
break;
277
240
}
278
241
279
242
/* A child exited, find it in process_list */
280
243
while(proc != NULL and proc->pid != pid){
281
244
proc = proc->next;
285
248
continue;
286
249
}
287
250
proc->status = status;
288
proc->completed = 1;
251
proc->completed = true;
289
252
}
290
errno = old_errno;
291
253
}
292
254
293
255
/* Prints out a password to stdout */
294
__attribute__((nonnull))
295
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
296
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
297
261
for(size_t written = 0; written < length; written += (size_t)ret){
298
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
299
263
length - written));
305
269
}
306
270
307
271
/* Removes and free a plugin from the plugin list */
308
__attribute__((nonnull))
309
272
static void free_plugin(plugin *plugin_node){
310
273
311
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
280
}
318
281
free(plugin_node->environ);
319
282
free(plugin_node->buffer);
320
283
321
284
/* Removes the plugin from the singly-linked list */
322
285
if(plugin_node == plugin_list){
323
286
/* First one - simple */
351
314
struct stat st;
352
315
fd_set rfds_all;
353
316
int ret, maxfd = 0;
354
ssize_t sret;
355
317
uid_t uid = 65534;
356
318
gid_t gid = 65534;
357
319
bool debug = false;
366
328
sigemptyset(&sigchld_action.sa_mask);
367
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
368
330
if(ret == -1){
369
error(0, errno, "sigaddset");
370
exitstatus = EX_OSERR;
331
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
371
333
goto fallback;
372
334
}
373
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
374
336
if(ret == -1){
375
error(0, errno, "sigaction");
376
exitstatus = EX_OSERR;
337
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
377
339
goto fallback;
378
340
}
379
341
411
373
.doc = "Group ID the plugins will run as", .group = 3 },
412
374
{ .name = "debug", .key = 132,
413
375
.doc = "Debug mode", .group = 4 },
414
/*
415
* These reproduce what we would get without ARGP_NO_HELP
416
*/
417
{ .name = "help", .key = '?',
418
.doc = "Give this help list", .group = -1 },
419
{ .name = "usage", .key = -3,
420
.doc = "Give a short usage message", .group = -1 },
421
{ .name = "version", .key = 'V',
422
.doc = "Print program version", .group = -1 },
423
376
{ .name = NULL }
424
377
};
425
378
426
__attribute__((nonnull(3)))
427
error_t parse_opt(int key, char *arg, struct argp_state *state){
428
errno = 0;
429
switch(key){
430
char *tmp;
431
intmax_t tmp_id;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
432
382
case 'g': /* --global-options */
433
{
434
char *plugin_option;
435
while((plugin_option = strsep(&arg, ",")) != NULL){
436
if(not add_argument(getplugin(NULL), plugin_option)){
437
break;
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
438
392
}
439
393
}
440
394
}
441
395
break;
442
396
case 'G': /* --global-env */
443
add_environment(getplugin(NULL), arg, true);
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
408
}
444
409
break;
445
410
case 'o': /* --options-for */
446
{
447
char *option_list = strchr(arg, ':');
448
if(option_list == NULL){
449
argp_error(state, "No colon in \"%s\"", arg);
450
errno = EINVAL;
451
break;
452
}
453
*option_list = '\0';
454
option_list++;
455
if(arg[0] == '\0'){
456
argp_error(state, "Empty plugin name");
457
errno = EINVAL;
458
break;
459
}
460
char *option;
461
while((option = strsep(&option_list, ",")) != NULL){
462
if(not add_argument(getplugin(arg), option)){
463
break;
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0'){
418
break;
419
}
420
if(opt != NULL){
421
char *p;
422
while((p = strsep(&opt, ",")) != NULL){
423
if(p[0] == '\0'){
424
continue;
425
}
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
429
}
464
430
}
465
431
}
466
432
}
467
433
break;
468
434
case 'E': /* --env-for */
435
if(arg == NULL){
436
break;
437
}
469
438
{
470
439
char *envdef = strchr(arg, ':');
471
440
if(envdef == NULL){
472
argp_error(state, "No colon in \"%s\"", arg);
473
errno = EINVAL;
474
break;
475
}
476
*envdef = '\0';
441
break;
442
}
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
477
447
envdef++;
478
if(arg[0] == '\0'){
479
argp_error(state, "Empty plugin name");
480
errno = EINVAL;
481
break;
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
482
450
}
483
add_environment(getplugin(arg), envdef, true);
484
451
}
485
452
break;
486
453
case 'd': /* --disable */
487
{
454
if (arg != NULL){
488
455
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = true;
456
if(p == NULL){
457
return ARGP_ERR_UNKNOWN;
491
458
}
459
p->disabled = true;
492
460
}
493
461
break;
494
462
case 'e': /* --enable */
495
{
463
if (arg != NULL){
496
464
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = false;
465
if(p == NULL){
466
return ARGP_ERR_UNKNOWN;
499
467
}
468
p->disabled = false;
500
469
}
501
470
break;
502
471
case 128: /* --plugin-dir */
503
free(plugindir);
504
472
plugindir = strdup(arg);
473
if(plugindir == NULL){
474
perror("strdup");
475
}
505
476
break;
506
477
case 129: /* --config-file */
507
478
/* This is already done by parse_opt_config_file() */
508
479
break;
509
480
case 130: /* --userid */
510
tmp_id = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmp_id != (uid_t)tmp_id){
513
argp_error(state, "Bad user ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)uid);
515
break;
516
}
517
uid = (uid_t)tmp_id;
481
uid = (uid_t)strtol(arg, NULL, 10);
518
482
break;
519
483
case 131: /* --groupid */
520
tmp_id = strtoimax(arg, &tmp, 10);
521
if(errno != 0 or tmp == arg or *tmp != '\0'
522
or tmp_id != (gid_t)tmp_id){
523
argp_error(state, "Bad group ID number: \"%s\", using %"
524
PRIdMAX, arg, (intmax_t)gid);
525
break;
526
}
527
gid = (gid_t)tmp_id;
484
gid = (gid_t)strtol(arg, NULL, 10);
528
485
break;
529
486
case 132: /* --debug */
530
487
debug = true;
531
488
break;
532
/*
533
* These reproduce what we would get without ARGP_NO_HELP
534
*/
535
case '?': /* --help */
536
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
537
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
538
case -3: /* --usage */
539
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
540
argp_state_help(state, state->out_stream,
541
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
542
case 'V': /* --version */
543
fprintf(state->out_stream, "%s\n", argp_program_version);
544
exit(EXIT_SUCCESS);
545
break;
546
/*
547
* When adding more options before this line, remember to also add a
548
* "case" to the "parse_opt_config_file" function below.
549
*/
550
489
case ARGP_KEY_ARG:
551
/* Cryptsetup always passes an argument, which is an empty
552
string if "none" was specified in /etc/crypttab. So if
553
argument was empty, we ignore it silently. */
554
if(arg[0] == '\0'){
555
break;
556
}
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
491
break;
492
case ARGP_KEY_END:
493
break;
557
494
default:
558
495
return ARGP_ERR_UNKNOWN;
559
496
}
560
return errno; /* Set to 0 at start */
497
return 0;
561
498
}
562
499
563
500
/* This option parser is the same as parse_opt() above, except it
564
501
ignores everything but the --config-file option. */
565
error_t parse_opt_config_file(int key, char *arg,
566
__attribute__((unused))
567
struct argp_state *state){
568
errno = 0;
569
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
570
506
case 'g': /* --global-options */
571
507
case 'G': /* --global-env */
572
508
case 'o': /* --options-for */
576
512
case 128: /* --plugin-dir */
577
513
break;
578
514
case 129: /* --config-file */
579
free(argfile);
580
515
argfile = strdup(arg);
581
break;
516
if(argfile == NULL){
517
perror("strdup");
518
}
519
break;
582
520
case 130: /* --userid */
583
521
case 131: /* --groupid */
584
522
case 132: /* --debug */
585
case '?': /* --help */
586
case -3: /* --usage */
587
case 'V': /* --version */
588
523
case ARGP_KEY_ARG:
524
case ARGP_KEY_END:
589
525
break;
590
526
default:
591
527
return ARGP_ERR_UNKNOWN;
592
528
}
593
return errno;
529
return 0;
594
530
}
595
531
596
532
struct argp argp = { .options = options,
598
534
.args_doc = "",
599
535
.doc = "Mandos plugin runner -- Run plugins" };
600
536
601
/* Parse using parse_opt_config_file() in order to get the custom
537
/* Parse using the parse_opt_config_file in order to get the custom
602
538
config file location, if any. */
603
ret = argp_parse(&argp, argc, argv,
604
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
605
NULL, NULL);
606
switch(ret){
607
case 0:
608
break;
609
case ENOMEM:
610
default:
611
errno = ret;
612
error(0, errno, "argp_parse");
613
exitstatus = EX_OSERR;
614
goto fallback;
615
case EINVAL:
616
exitstatus = EX_USAGE;
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
541
fprintf(stderr, "Unknown error while parsing arguments\n");
542
exitstatus = EXIT_FAILURE;
617
543
goto fallback;
618
544
}
619
545
621
547
argp.parser = parse_opt;
622
548
623
549
/* Open the configfile if available */
624
if(argfile == NULL){
550
if (argfile == NULL){
625
551
conffp = fopen(AFILE, "r");
626
552
} else {
627
553
conffp = fopen(argfile, "r");
628
}
554
}
629
555
if(conffp != NULL){
630
556
char *org_line = NULL;
631
557
char *p, *arg, *new_arg, *line;
632
558
size_t size = 0;
559
ssize_t sret;
633
560
const char whitespace_delims[] = " \r\t\f\v\n";
634
561
const char comment_delim[] = "#";
635
562
636
563
custom_argc = 1;
637
564
custom_argv = malloc(sizeof(char*) * 2);
638
565
if(custom_argv == NULL){
639
error(0, errno, "malloc");
640
exitstatus = EX_OSERR;
566
perror("malloc");
567
exitstatus = EXIT_FAILURE;
641
568
goto fallback;
642
569
}
643
570
custom_argv[0] = argv[0];
644
571
custom_argv[1] = NULL;
645
572
646
573
/* for each line in the config file, strip whitespace and ignore
647
574
commented text */
648
575
while(true){
650
577
if(sret == -1){
651
578
break;
652
579
}
653
580
654
581
line = org_line;
655
582
arg = strsep(&line, comment_delim);
656
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
659
586
}
660
587
new_arg = strdup(p);
661
588
if(new_arg == NULL){
662
error(0, errno, "strdup");
663
exitstatus = EX_OSERR;
589
perror("strdup");
590
exitstatus = EXIT_FAILURE;
664
591
free(org_line);
665
592
goto fallback;
666
593
}
667
594
668
595
custom_argc += 1;
669
{
670
char **new_argv = realloc(custom_argv, sizeof(char *)
671
* ((unsigned int)
672
custom_argc + 1));
673
if(new_argv == NULL){
674
error(0, errno, "realloc");
675
exitstatus = EX_OSERR;
676
free(new_arg);
677
free(org_line);
678
goto fallback;
679
} else {
680
custom_argv = new_argv;
681
}
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
599
perror("realloc");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
682
603
}
683
604
custom_argv[custom_argc-1] = new_arg;
684
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
685
606
}
686
607
}
687
do {
688
ret = fclose(conffp);
689
} while(ret == EOF and errno == EINTR);
690
if(ret == EOF){
691
error(0, errno, "fclose");
692
exitstatus = EX_IOERR;
693
goto fallback;
694
}
695
608
free(org_line);
696
609
} else {
697
610
/* Check for harmful errors and go to fallback. Other errors might
698
611
not affect opening plugins */
699
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
700
error(0, errno, "fopen");
701
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
613
perror("fopen");
614
exitstatus = EXIT_FAILURE;
702
615
goto fallback;
703
616
}
704
617
}
705
/* If there were any arguments from the configuration file, pass
706
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
707
620
if(custom_argv != NULL){
708
ret = argp_parse(&argp, custom_argc, custom_argv,
709
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
710
NULL, NULL);
711
switch(ret){
712
case 0:
713
break;
714
case ENOMEM:
715
default:
716
errno = ret;
717
error(0, errno, "argp_parse");
718
exitstatus = EX_OSERR;
719
goto fallback;
720
case EINVAL:
721
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
722
626
goto fallback;
723
627
}
724
628
}
725
629
726
630
/* Parse actual command line arguments, to let them override the
727
631
config file */
728
ret = argp_parse(&argp, argc, argv,
729
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
730
NULL, NULL);
731
switch(ret){
732
case 0:
733
break;
734
case ENOMEM:
735
default:
736
errno = ret;
737
error(0, errno, "argp_parse");
738
exitstatus = EX_OSERR;
739
goto fallback;
740
case EINVAL:
741
exitstatus = EX_USAGE;
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
742
636
goto fallback;
743
637
}
744
638
749
643
for(char **a = p->argv; *a != NULL; a++){
750
644
fprintf(stderr, "\tArg: %s\n", *a);
751
645
}
752
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
753
647
for(char **a = p->environ; *a != NULL; a++){
754
648
fprintf(stderr, "\t%s\n", *a);
755
649
}
756
650
}
757
651
}
758
652
759
if(getuid() == 0){
760
/* Work around Debian bug #633582:
761
<http://bugs.debian.org/633582> */
762
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
763
if(plugindir_fd == -1){
764
error(0, errno, "open");
765
} else {
766
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
767
if(ret == -1){
768
error(0, errno, "fstat");
769
} else {
770
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
771
ret = fchown(plugindir_fd, uid, gid);
772
if(ret == -1){
773
error(0, errno, "fchown");
774
}
775
}
776
}
777
TEMP_FAILURE_RETRY(close(plugindir_fd));
778
}
779
}
780
781
/* Lower permissions */
782
ret = setgid(gid);
783
if(ret == -1){
784
error(0, errno, "setgid");
785
}
653
/* Strip permissions down to nobody */
786
654
ret = setuid(uid);
787
if(ret == -1){
788
error(0, errno, "setuid");
789
}
790
791
/* Open plugin directory with close_on_exec flag */
655
if (ret == -1){
656
perror("setuid");
657
}
658
setgid(gid);
659
if (ret == -1){
660
perror("setgid");
661
}
662
663
if (plugindir == NULL){
664
dir = opendir(PDIR);
665
} else {
666
dir = opendir(plugindir);
667
}
668
669
if(dir == NULL){
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
672
goto fallback;
673
}
674
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
792
676
{
793
int dir_fd = -1;
794
if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
} else {
803
dir_fd = open(plugindir, O_RDONLY |
804
#ifdef O_CLOEXEC
805
O_CLOEXEC
806
#else /* not O_CLOEXEC */
807
0
808
#endif /* not O_CLOEXEC */
809
);
810
}
811
if(dir_fd == -1){
812
error(0, errno, "Could not open plugin dir");
813
exitstatus = EX_UNAVAILABLE;
814
goto fallback;
815
}
816
817
#ifndef O_CLOEXEC
818
/* Set the FD_CLOEXEC flag on the directory */
819
ret = set_cloexec_flag(dir_fd);
820
if(ret < 0){
821
error(0, errno, "set_cloexec_flag");
822
TEMP_FAILURE_RETRY(close(dir_fd));
823
exitstatus = EX_OSERR;
824
goto fallback;
825
}
826
#endif /* O_CLOEXEC */
827
828
dir = fdopendir(dir_fd);
829
if(dir == NULL){
830
error(0, errno, "Could not open plugin dir");
831
TEMP_FAILURE_RETRY(close(dir_fd));
832
exitstatus = EX_OSERR;
833
goto fallback;
677
int dir_fd = dirfd(dir);
678
if(dir_fd >= 0){
679
ret = set_cloexec_flag(dir_fd);
680
if(ret < 0){
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
683
goto fallback;
684
}
834
685
}
835
686
}
836
687
838
689
839
690
/* Read and execute any executable in the plugin directory*/
840
691
while(true){
841
do {
842
dirst = readdir(dir);
843
} while(dirst == NULL and errno == EINTR);
692
dirst = readdir(dir);
844
693
845
694
/* All directory entries have been processed */
846
695
if(dirst == NULL){
847
if(errno == EBADF){
848
error(0, errno, "readdir");
849
exitstatus = EX_IOERR;
696
if (errno == EBADF){
697
perror("readdir");
698
exitstatus = EXIT_FAILURE;
850
699
goto fallback;
851
700
}
852
701
break;
858
707
{
859
708
bool bad_name = false;
860
709
861
const char * const bad_prefixes[] = { ".", "#", NULL };
710
const char const *bad_prefixes[] = { ".", "#", NULL };
862
711
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
864
713
".dpkg-old",
865
".dpkg-bak",
866
714
".dpkg-divert", NULL };
867
#ifdef __GNUC__
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
870
#endif
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
873
#ifdef __GNUC__
874
#pragma GCC diagnostic pop
875
#endif
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
876
716
size_t pre_len = strlen(*pre);
877
717
if((d_name_len >= pre_len)
878
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
887
727
if(bad_name){
888
728
continue;
889
729
}
890
#ifdef __GNUC__
891
#pragma GCC diagnostic push
892
#pragma GCC diagnostic ignored "-Wcast-qual"
893
#endif
894
for(const char **suf = (const char **)bad_suffixes;
895
*suf != NULL; suf++){
896
#ifdef __GNUC__
897
#pragma GCC diagnostic pop
898
#endif
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
899
731
size_t suf_len = strlen(*suf);
900
732
if((d_name_len >= suf_len)
901
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
902
734
== 0)){
903
735
if(debug){
904
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
745
continue;
914
746
}
915
747
}
916
748
917
749
char *filename;
918
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
920
dirst->d_name));
921
} else {
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
923
plugindir,
924
dirst->d_name));
925
}
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
926
751
if(ret < 0){
927
error(0, errno, "asprintf");
752
perror("asprintf");
928
753
continue;
929
754
}
930
755
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
932
if(ret == -1){
933
error(0, errno, "stat");
756
ret = stat(filename, &st);
757
if (ret == -1){
758
perror("stat");
934
759
free(filename);
935
760
continue;
936
761
}
937
762
938
763
/* Ignore non-executable files */
939
if(not S_ISREG(st.st_mode)
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
941
765
if(debug){
942
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
767
" with bad type or mode\n", filename);
948
772
949
773
plugin *p = getplugin(dirst->d_name);
950
774
if(p == NULL){
951
error(0, errno, "getplugin");
775
perror("getplugin");
952
776
free(filename);
953
777
continue;
954
778
}
966
790
if(g != NULL){
967
791
for(char **a = g->argv + 1; *a != NULL; a++){
968
792
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
793
perror("add_argument");
970
794
}
971
795
}
972
796
/* Add global environment variables */
973
797
for(char **e = g->environ; *e != NULL; e++){
974
798
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
799
perror("add_environment");
976
800
}
977
801
}
978
802
}
983
807
if(p->environ[0] != NULL){
984
808
for(char **e = environ; *e != NULL; e++){
985
809
if(not add_environment(p, *e, false)){
986
error(0, errno, "add_environment");
810
perror("add_environment");
987
811
}
988
812
}
989
813
}
990
814
991
815
int pipefd[2];
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
993
if(ret == -1){
994
error(0, errno, "pipe");
995
exitstatus = EX_OSERR;
816
ret = pipe(pipefd);
817
if (ret == -1){
818
perror("pipe");
819
exitstatus = EXIT_FAILURE;
996
820
goto fallback;
997
821
}
998
822
/* Ask OS to automatic close the pipe on exec */
999
823
ret = set_cloexec_flag(pipefd[0]);
1000
824
if(ret < 0){
1001
error(0, errno, "set_cloexec_flag");
1002
exitstatus = EX_OSERR;
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1003
827
goto fallback;
1004
828
}
1005
829
ret = set_cloexec_flag(pipefd[1]);
1006
830
if(ret < 0){
1007
error(0, errno, "set_cloexec_flag");
1008
exitstatus = EX_OSERR;
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1009
833
goto fallback;
1010
834
}
1011
835
/* Block SIGCHLD until process is safely in process list */
1012
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1013
&sigchld_action.sa_mask,
1014
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1015
837
if(ret < 0){
1016
error(0, errno, "sigprocmask");
1017
exitstatus = EX_OSERR;
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1018
840
goto fallback;
1019
841
}
1020
842
/* Starting a new process to be watched */
1021
pid_t pid;
1022
do {
1023
pid = fork();
1024
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
1025
844
if(pid == -1){
1026
error(0, errno, "fork");
1027
exitstatus = EX_OSERR;
845
perror("fork");
846
exitstatus = EXIT_FAILURE;
1028
847
goto fallback;
1029
848
}
1030
849
if(pid == 0){
1031
850
/* this is the child process */
1032
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1033
852
if(ret < 0){
1034
error(0, errno, "sigaction");
1035
_exit(EX_OSERR);
853
perror("sigaction");
854
_exit(EXIT_FAILURE);
1036
855
}
1037
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
857
if(ret < 0){
1039
error(0, errno, "sigprocmask");
1040
_exit(EX_OSERR);
858
perror("sigprocmask");
859
_exit(EXIT_FAILURE);
1041
860
}
1042
861
1043
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1044
863
if(ret == -1){
1045
error(0, errno, "dup2");
1046
_exit(EX_OSERR);
864
perror("dup2");
865
_exit(EXIT_FAILURE);
1047
866
}
1048
867
1049
868
if(dirfd(dir) < 0){
1053
872
}
1054
873
if(p->environ[0] == NULL){
1055
874
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1057
_exit(EX_OSERR);
875
perror("execv");
876
_exit(EXIT_FAILURE);
1058
877
}
1059
878
} else {
1060
879
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1062
_exit(EX_OSERR);
880
perror("execve");
881
_exit(EXIT_FAILURE);
1063
882
}
1064
883
}
1065
884
/* no return */
1066
885
}
1067
886
/* Parent process */
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1069
pipe */
887
close(pipefd[1]); /* Close unused write end of pipe */
1070
888
free(filename);
1071
889
plugin *new_plugin = getplugin(dirst->d_name);
1072
if(new_plugin == NULL){
1073
error(0, errno, "getplugin");
1074
ret = (int)(TEMP_FAILURE_RETRY
1075
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
NULL)));
890
if (new_plugin == NULL){
891
perror("getplugin");
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
893
if(ret < 0){
1078
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1079
895
}
1080
exitstatus = EX_OSERR;
896
exitstatus = EXIT_FAILURE;
1081
897
goto fallback;
1082
898
}
1083
899
1086
902
1087
903
/* Unblock SIGCHLD so signal handler can be run if this process
1088
904
has already completed */
1089
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1090
&sigchld_action.sa_mask,
1091
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
906
if(ret < 0){
1093
error(0, errno, "sigprocmask");
1094
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1095
909
goto fallback;
1096
910
}
1097
911
1098
#if defined (__GNUC__) and defined (__GLIBC__)
1099
#if not __GLIBC_PREREQ(2, 16)
1100
#pragma GCC diagnostic push
1101
#pragma GCC diagnostic ignored "-Wsign-conversion"
1102
#endif
1103
#endif
1104
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion in GNU libc
1106
before 2.16 */
1107
#if defined (__GNUC__) and defined (__GLIBC__)
1108
#if not __GLIBC_PREREQ(2, 16)
1109
#pragma GCC diagnostic pop
1110
#endif
1111
#endif
912
FD_SET(new_plugin->fd, &rfds_all);
1112
913
1113
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1114
915
maxfd = new_plugin->fd;
1115
916
}
917
1116
918
}
1117
919
1118
TEMP_FAILURE_RETRY(closedir(dir));
920
closedir(dir);
1119
921
dir = NULL;
1120
free_plugin(getplugin(NULL));
1121
922
1122
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1123
924
if(p->pid != 0){
1124
925
break;
1129
930
free_plugin_list();
1130
931
}
1131
932
}
1132
933
1133
934
/* Main loop while running plugins exist */
1134
935
while(plugin_list){
1135
936
fd_set rfds = rfds_all;
1136
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1137
if(select_ret == -1 and errno != EINTR){
1138
error(0, errno, "select");
1139
exitstatus = EX_OSERR;
938
if (select_ret == -1){
939
perror("select");
940
exitstatus = EXIT_FAILURE;
1140
941
goto fallback;
1141
942
}
1142
943
/* OK, now either a process completed, or something can be read
1143
944
from one of them */
1144
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1145
946
/* Is this process completely done? */
1146
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1147
948
/* Only accept the plugin output if it exited cleanly */
1148
949
if(not WIFEXITED(proc->status)
1149
950
or WEXITSTATUS(proc->status) != 0){
1150
951
/* Bad exit by plugin */
1151
952
1152
953
if(debug){
1153
954
if(WIFEXITED(proc->status)){
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1155
" status %d\n", proc->name,
1156
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1157
957
WEXITSTATUS(proc->status));
1158
} else if(WIFSIGNALED(proc->status)){
1159
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1160
" signal %d: %s\n", proc->name,
1161
(intmax_t) (proc->pid),
1162
WTERMSIG(proc->status),
1163
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1164
962
} else if(WCOREDUMP(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1166
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1167
965
}
1168
966
}
1169
967
1170
968
/* Remove the plugin */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic push
1174
#pragma GCC diagnostic ignored "-Wsign-conversion"
1175
#endif
1176
#endif
1177
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1178
-Wconversion in GNU libc
1179
before 2.16 */
1180
#if defined (__GNUC__) and defined (__GLIBC__)
1181
#if not __GLIBC_PREREQ(2, 16)
1182
#pragma GCC diagnostic pop
1183
#endif
1184
#endif
1185
969
FD_CLR(proc->fd, &rfds_all);
970
1186
971
/* Block signal while modifying process_list */
1187
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1188
(SIG_BLOCK,
1189
&sigchld_action.sa_mask,
1190
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1191
973
if(ret < 0){
1192
error(0, errno, "sigprocmask");
1193
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1194
976
goto fallback;
1195
977
}
1196
1197
plugin *next_plugin = proc->next;
1198
978
free_plugin(proc);
1199
proc = next_plugin;
1200
1201
979
/* We are done modifying process list, so unblock signal */
1202
ret = (int)(TEMP_FAILURE_RETRY
1203
(sigprocmask(SIG_UNBLOCK,
1204
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1205
982
if(ret < 0){
1206
error(0, errno, "sigprocmask");
1207
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1208
985
goto fallback;
1209
986
}
1210
987
1211
988
if(plugin_list == NULL){
1212
989
break;
1213
990
}
1214
1215
991
continue;
1216
992
}
1217
993
1218
994
/* This process exited nicely, so print its buffer */
1219
995
1220
996
bool bret = print_out_password(proc->buffer,
1221
997
proc->buffer_length);
1222
998
if(not bret){
1223
error(0, errno, "print_out_password");
1224
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1225
1001
}
1226
1002
goto fallback;
1227
1003
}
1228
1004
1229
1005
/* This process has not completed. Does it have any output? */
1230
#if defined (__GNUC__) and defined (__GLIBC__)
1231
#if not __GLIBC_PREREQ(2, 16)
1232
#pragma GCC diagnostic push
1233
#pragma GCC diagnostic ignored "-Wsign-conversion"
1234
#endif
1235
#endif
1236
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1237
warning from
1238
-Wconversion
1239
in GNU libc
1240
before
1241
2.16 */
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic pop
1245
#endif
1246
#endif
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1247
1007
/* This process had nothing to say at this time */
1248
proc = proc->next;
1249
1008
continue;
1250
1009
}
1251
1010
/* Before reading, make the process' data buffer large enough */
1252
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1253
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1254
+ (size_t) BUFFER_SIZE);
1255
if(new_buffer == NULL){
1256
error(0, errno, "malloc");
1257
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1258
1017
goto fallback;
1259
1018
}
1260
proc->buffer = new_buffer;
1261
1019
proc->buffer_size += BUFFER_SIZE;
1262
1020
}
1263
1021
/* Read from the process */
1264
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1265
proc->buffer
1266
+ proc->buffer_length,
1267
BUFFER_SIZE));
1268
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1269
1025
/* Read error from this process; ignore the error */
1270
proc = proc->next;
1271
1026
continue;
1272
1027
}
1273
if(sret == 0){
1028
if(ret == 0){
1274
1029
/* got EOF */
1275
1030
proc->eof = true;
1276
1031
} else {
1277
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1278
1033
}
1279
1034
}
1280
1035
}
1281
1282
1036
1037
1283
1038
fallback:
1284
1039
1285
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1286
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1287
1041
/* Fallback if all plugins failed, none are found or an error
1288
1042
occured */
1289
1043
bool bret;
1290
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1291
1045
char *passwordbuffer = getpass("Password: ");
1292
size_t len = strlen(passwordbuffer);
1293
/* Strip trailing newline */
1294
if(len > 0 and passwordbuffer[len-1] == '\n'){
1295
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1296
len--;
1297
}
1298
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1299
1047
if(not bret){
1300
error(0, errno, "print_out_password");
1301
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1302
1050
}
1303
1051
}
1304
1052
1305
1053
/* Restore old signal handler */
1306
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1307
1055
if(ret == -1){
1308
error(0, errno, "sigaction");
1309
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1310
1058
}
1311
1059
1312
1060
if(custom_argv != NULL){
1313
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1314
1062
free(*arg);
1320
1068
closedir(dir);
1321
1069
}
1322
1070
1323
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1324
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1325
1073
if(p->pid != 0){
1326
1074
close(p->fd);
1327
1075
ret = kill(p->pid, SIGTERM);
1328
1076
if(ret == -1 and errno != ESRCH){
1329
1077
/* Set-uid proccesses might not get closed */
1330
error(0, errno, "kill");
1078
perror("kill");
1331
1079
}
1332
1080
}
1333
1081
}
1334
1082
1335
1083
/* Wait for any remaining child processes to terminate */
1336
do {
1084
do{
1337
1085
ret = wait(NULL);
1338
1086
} while(ret >= 0);
1339
1087
if(errno != ECHILD){
1340
error(0, errno, "wait");
1088
perror("wait");
1341
1089
}
1342
1090
1343
1091
free_plugin_list();
1344
1092
1345
1093
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0