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 149
- compare with another revision
- download diff
- download tarball
- view history from revision 149
- Committer: Teddy Hogeborn
- Date: 2008-09-03 19:13:50 UTC
- mfrom: (24.1.83 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080903191350-la2y2wuxt67xjslb
* mandos-keygen.xml (BUGS): Commented out.
* mandos.xml (BUGS): Note non-checking of expire time of OpenPGP keys.
* mandos.xml (BUGS): Note non-checking of expire time of OpenPGP keys.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
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
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
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() */
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
66
72
67
#define BUFFER_SIZE 256
73
68
74
69
#define PDIR "/lib/mandos/plugins.d"
75
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
76
71
77
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
78
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
74
75
struct plugin;
76
80
77
typedef struct plugin{
81
78
char *name; /* can be NULL or any plugin name */
82
79
char **argv;
84
81
char **environ;
85
82
int envc;
86
83
bool disabled;
87
84
88
85
/* Variables used for running processes*/
89
86
pid_t pid;
90
87
int fd;
92
89
size_t buffer_size;
93
90
size_t buffer_length;
94
91
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
92
volatile bool completed;
93
volatile int status;
97
94
struct plugin *next;
98
95
} plugin;
99
96
100
97
static plugin *plugin_list = NULL;
101
98
102
/* Gets an existing plugin based on name,
99
/* Gets a existing plugin based on name,
103
100
or if none is found, creates a new one */
104
101
static plugin *getplugin(char *name){
105
102
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
109
106
return p;
110
107
}
111
108
}
112
109
/* Create a new plugin */
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
118
112
return NULL;
119
113
}
120
114
char *copy_name = NULL;
121
115
if(name != NULL){
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
125
117
if(copy_name == NULL){
126
free(new_plugin);
127
118
return NULL;
128
119
}
129
120
}
130
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
135
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
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){
140
129
free(copy_name);
141
130
free(new_plugin);
142
131
return NULL;
144
133
new_plugin->argv[0] = copy_name;
145
134
new_plugin->argv[1] = NULL;
146
135
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
150
137
if(new_plugin->environ == NULL){
151
138
free(copy_name);
152
139
free(new_plugin->argv);
164
151
static bool add_to_char_array(const char *new, char ***array,
165
152
int *len){
166
153
/* Resize the pointed-to array to hold one more pointer */
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
171
156
/* Malloc check */
172
157
if(*array == NULL){
173
158
return false;
174
159
}
175
160
/* Make a copy of the new string */
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
161
char *copy = strdup(new);
180
162
if(copy == NULL){
181
163
return false;
182
164
}
205
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
188
/* Search for this environment variable */
207
189
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
190
if(strncmp(*e, def, namelen+1) == 0){
209
191
/* It already exists */
210
192
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
193
char *new = realloc(*e, strlen(def));
215
194
if(new == NULL){
216
195
return false;
217
196
}
227
206
/*
228
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
208
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
231
210
*/
232
static int set_cloexec_flag(int fd){
233
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);
234
214
/* If reading the flags failed, return error indication now. */
235
215
if(ret < 0){
236
216
return ret;
237
217
}
238
218
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
241
220
}
242
221
243
222
244
223
/* Mark processes as completed when they exit, and save their exit
245
224
status. */
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
248
226
while(true){
249
227
plugin *proc = plugin_list;
250
228
int status;
254
232
break;
255
233
}
256
234
if(pid == -1){
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
235
if (errno != ECHILD){
236
perror("waitpid");
260
237
}
261
perror("waitpid");
238
/* No child processes */
239
break;
262
240
}
263
241
264
242
/* A child exited, find it in process_list */
265
243
while(proc != NULL and proc->pid != pid){
266
244
proc = proc->next;
270
248
continue;
271
249
}
272
250
proc->status = status;
273
proc->completed = 1;
251
proc->completed = true;
274
252
}
275
errno = old_errno;
276
253
}
277
254
278
255
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
256
bool print_out_password(const char *buffer, size_t length){
280
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
281
261
for(size_t written = 0; written < length; written += (size_t)ret){
282
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
283
263
length - written));
300
280
}
301
281
free(plugin_node->environ);
302
282
free(plugin_node->buffer);
303
283
304
284
/* Removes the plugin from the singly-linked list */
305
285
if(plugin_node == plugin_list){
306
286
/* First one - simple */
334
314
struct stat st;
335
315
fd_set rfds_all;
336
316
int ret, maxfd = 0;
337
ssize_t sret;
338
317
uid_t uid = 65534;
339
318
gid_t gid = 65534;
340
319
bool debug = false;
397
376
{ .name = NULL }
398
377
};
399
378
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
381
switch (key) {
405
382
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
410
387
continue;
411
388
}
412
if(not add_argument(getplugin(NULL), plugin_option)){
389
if(not add_argument(getplugin(NULL), p)){
413
390
perror("add_argument");
414
391
return ARGP_ERR_UNKNOWN;
415
392
}
420
397
if(arg == NULL){
421
398
break;
422
399
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
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
}
425
408
}
426
409
break;
427
410
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
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
}
438
430
}
439
431
}
440
432
}
448
440
if(envdef == NULL){
449
441
break;
450
442
}
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
444
if(p_name == NULL){
445
break;
446
}
447
envdef++;
448
if(not add_environment(getplugin(p_name), envdef, true)){
453
449
perror("add_environment");
454
450
}
455
451
}
456
452
break;
457
453
case 'd': /* --disable */
458
if(arg != NULL){
454
if (arg != NULL){
459
455
plugin *p = getplugin(arg);
460
456
if(p == NULL){
461
457
return ARGP_ERR_UNKNOWN;
464
460
}
465
461
break;
466
462
case 'e': /* --enable */
467
if(arg != NULL){
463
if (arg != NULL){
468
464
plugin *p = getplugin(arg);
469
465
if(p == NULL){
470
466
return ARGP_ERR_UNKNOWN;
473
469
}
474
470
break;
475
471
case 128: /* --plugin-dir */
476
free(plugindir);
477
472
plugindir = strdup(arg);
478
473
if(plugindir == NULL){
479
474
perror("strdup");
480
}
475
}
481
476
break;
482
477
case 129: /* --config-file */
483
478
/* This is already done by parse_opt_config_file() */
484
479
break;
485
480
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
481
uid = (uid_t)strtol(arg, NULL, 10);
495
482
break;
496
483
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
484
gid = (gid_t)strtol(arg, NULL, 10);
506
485
break;
507
486
case 132: /* --debug */
508
487
debug = true;
509
488
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
489
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
521
491
break;
522
492
case ARGP_KEY_END:
523
493
break;
529
499
530
500
/* This option parser is the same as parse_opt() above, except it
531
501
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
505
switch (key) {
536
506
case 'g': /* --global-options */
537
507
case 'G': /* --global-env */
538
508
case 'o': /* --options-for */
542
512
case 128: /* --plugin-dir */
543
513
break;
544
514
case 129: /* --config-file */
545
free(argfile);
546
515
argfile = strdup(arg);
547
516
if(argfile == NULL){
548
517
perror("strdup");
549
518
}
550
break;
519
break;
551
520
case 130: /* --userid */
552
521
case 131: /* --groupid */
553
522
case 132: /* --debug */
565
534
.args_doc = "",
566
535
.doc = "Mandos plugin runner -- Run plugins" };
567
536
568
/* 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
569
538
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
539
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
540
if (ret == ARGP_ERR_UNKNOWN){
572
541
fprintf(stderr, "Unknown error while parsing arguments\n");
573
542
exitstatus = EXIT_FAILURE;
574
543
goto fallback;
578
547
argp.parser = parse_opt;
579
548
580
549
/* Open the configfile if available */
581
if(argfile == NULL){
550
if (argfile == NULL){
582
551
conffp = fopen(AFILE, "r");
583
552
} else {
584
553
conffp = fopen(argfile, "r");
585
}
554
}
586
555
if(conffp != NULL){
587
556
char *org_line = NULL;
588
557
char *p, *arg, *new_arg, *line;
589
558
size_t size = 0;
559
ssize_t sret;
590
560
const char whitespace_delims[] = " \r\t\f\v\n";
591
561
const char comment_delim[] = "#";
592
562
593
563
custom_argc = 1;
594
564
custom_argv = malloc(sizeof(char*) * 2);
595
565
if(custom_argv == NULL){
599
569
}
600
570
custom_argv[0] = argv[0];
601
571
custom_argv[1] = NULL;
602
572
603
573
/* for each line in the config file, strip whitespace and ignore
604
574
commented text */
605
575
while(true){
607
577
if(sret == -1){
608
578
break;
609
579
}
610
580
611
581
line = org_line;
612
582
arg = strsep(&line, comment_delim);
613
583
while((p = strsep(&arg, whitespace_delims)) != NULL){
632
602
goto fallback;
633
603
}
634
604
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
636
606
}
637
607
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
646
608
free(org_line);
647
609
} else {
648
610
/* Check for harmful errors and go to fallback. Other errors might
649
611
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
613
perror("fopen");
652
614
exitstatus = EXIT_FAILURE;
653
615
goto fallback;
656
618
/* If there was any arguments from configuration file,
657
619
pass them to parser as command arguments */
658
620
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
622
0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
662
624
fprintf(stderr, "Unknown error while parsing arguments\n");
663
625
exitstatus = EXIT_FAILURE;
664
626
goto fallback;
667
629
668
630
/* Parse actual command line arguments, to let them override the
669
631
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
672
634
fprintf(stderr, "Unknown error while parsing arguments\n");
673
635
exitstatus = EXIT_FAILURE;
674
636
goto fallback;
681
643
for(char **a = p->argv; *a != NULL; a++){
682
644
fprintf(stderr, "\tArg: %s\n", *a);
683
645
}
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
647
for(char **a = p->environ; *a != NULL; a++){
686
648
fprintf(stderr, "\t%s\n", *a);
687
649
}
689
651
}
690
652
691
653
/* Strip permissions down to nobody */
654
ret = setuid(uid);
655
if (ret == -1){
656
perror("setuid");
657
}
692
658
setgid(gid);
693
if(ret == -1){
659
if (ret == -1){
694
660
perror("setgid");
695
661
}
696
ret = setuid(uid);
697
if(ret == -1){
698
perror("setuid");
699
}
700
662
701
if(plugindir == NULL){
663
if (plugindir == NULL){
702
664
dir = opendir(PDIR);
703
665
} else {
704
666
dir = opendir(plugindir);
727
689
728
690
/* Read and execute any executable in the plugin directory*/
729
691
while(true){
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
692
dirst = readdir(dir);
733
693
734
694
/* All directory entries have been processed */
735
695
if(dirst == NULL){
736
if(errno == EBADF){
696
if (errno == EBADF){
737
697
perror("readdir");
738
698
exitstatus = EXIT_FAILURE;
739
699
goto fallback;
751
711
752
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
753
713
".dpkg-old",
754
".dpkg-bak",
755
714
".dpkg-divert", NULL };
756
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
757
716
size_t pre_len = strlen(*pre);
786
745
continue;
787
746
}
788
747
}
789
748
790
749
char *filename;
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
799
751
if(ret < 0){
800
752
perror("asprintf");
801
753
continue;
802
754
}
803
755
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
756
ret = stat(filename, &st);
757
if (ret == -1){
806
758
perror("stat");
807
759
free(filename);
808
760
continue;
809
761
}
810
762
811
763
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
814
765
if(debug){
815
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
767
" with bad type or mode\n", filename);
862
813
}
863
814
864
815
int pipefd[2];
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
816
ret = pipe(pipefd);
817
if (ret == -1){
867
818
perror("pipe");
868
819
exitstatus = EXIT_FAILURE;
869
820
goto fallback;
882
833
goto fallback;
883
834
}
884
835
/* Block SIGCHLD until process is safely in process list */
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
888
837
if(ret < 0){
889
838
perror("sigprocmask");
890
839
exitstatus = EXIT_FAILURE;
891
840
goto fallback;
892
841
}
893
842
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
843
pid_t pid = fork();
898
844
if(pid == -1){
899
845
perror("fork");
900
846
exitstatus = EXIT_FAILURE;
907
853
perror("sigaction");
908
854
_exit(EXIT_FAILURE);
909
855
}
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
857
if(ret < 0){
912
858
perror("sigprocmask");
913
859
_exit(EXIT_FAILURE);
914
860
}
915
861
916
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
917
863
if(ret == -1){
918
864
perror("dup2");
938
884
/* no return */
939
885
}
940
886
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
887
close(pipefd[1]); /* Close unused write end of pipe */
943
888
free(filename);
944
889
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
890
if (new_plugin == NULL){
946
891
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
950
893
if(ret < 0){
951
894
perror("sigprocmask");
952
895
}
959
902
960
903
/* Unblock SIGCHLD so signal handler can be run if this process
961
904
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
965
906
if(ret < 0){
966
907
perror("sigprocmask");
967
908
exitstatus = EXIT_FAILURE;
970
911
971
912
FD_SET(new_plugin->fd, &rfds_all);
972
913
973
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
974
915
maxfd = new_plugin->fd;
975
916
}
917
976
918
}
977
919
978
TEMP_FAILURE_RETRY(closedir(dir));
920
closedir(dir);
979
921
dir = NULL;
980
free_plugin(getplugin(NULL));
981
922
982
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
983
924
if(p->pid != 0){
984
925
break;
989
930
free_plugin_list();
990
931
}
991
932
}
992
933
993
934
/* Main loop while running plugins exist */
994
935
while(plugin_list){
995
936
fd_set rfds = rfds_all;
996
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
938
if (select_ret == -1){
998
939
perror("select");
999
940
exitstatus = EXIT_FAILURE;
1000
941
goto fallback;
1001
942
}
1002
943
/* OK, now either a process completed, or something can be read
1003
944
from one of them */
1004
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1005
946
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1007
948
/* Only accept the plugin output if it exited cleanly */
1008
949
if(not WIFEXITED(proc->status)
1009
950
or WEXITSTATUS(proc->status) != 0){
1010
951
/* Bad exit by plugin */
1011
952
1012
953
if(debug){
1013
954
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1017
957
WEXITSTATUS(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
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));
1024
962
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1027
965
}
1028
966
}
1029
967
1030
968
/* Remove the plugin */
1031
969
FD_CLR(proc->fd, &rfds_all);
1032
970
1033
971
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1035
(SIG_BLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1038
973
if(ret < 0){
1039
974
perror("sigprocmask");
1040
975
exitstatus = EXIT_FAILURE;
1041
976
goto fallback;
1042
977
}
1043
1044
plugin *next_plugin = proc->next;
1045
978
free_plugin(proc);
1046
proc = next_plugin;
1047
1048
979
/* We are done modifying process list, so unblock signal */
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
NULL);
1052
982
if(ret < 0){
1053
983
perror("sigprocmask");
1054
984
exitstatus = EXIT_FAILURE;
1058
988
if(plugin_list == NULL){
1059
989
break;
1060
990
}
1061
1062
991
continue;
1063
992
}
1064
993
1065
994
/* This process exited nicely, so print its buffer */
1066
995
1067
996
bool bret = print_out_password(proc->buffer,
1068
997
proc->buffer_length);
1069
998
if(not bret){
1076
1005
/* This process has not completed. Does it have any output? */
1077
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1078
1007
/* This process had nothing to say at this time */
1079
proc = proc->next;
1080
1008
continue;
1081
1009
}
1082
1010
/* Before reading, make the process' data buffer large enough */
1083
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
1013
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
1014
if (proc->buffer == NULL){
1087
1015
perror("malloc");
1088
1016
exitstatus = EXIT_FAILURE;
1089
1017
goto fallback;
1091
1019
proc->buffer_size += BUFFER_SIZE;
1092
1020
}
1093
1021
/* Read from the process */
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1095
proc->buffer
1096
+ proc->buffer_length,
1097
BUFFER_SIZE));
1098
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1099
1025
/* Read error from this process; ignore the error */
1100
proc = proc->next;
1101
1026
continue;
1102
1027
}
1103
if(sret == 0){
1028
if(ret == 0){
1104
1029
/* got EOF */
1105
1030
proc->eof = true;
1106
1031
} else {
1107
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1108
1033
}
1109
1034
}
1110
1035
}
1111
1112
1036
1037
1113
1038
fallback:
1114
1039
1115
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1118
1043
bool bret;
1119
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1120
1045
char *passwordbuffer = getpass("Password: ");
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1125
len--;
1126
}
1127
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1128
1047
if(not bret){
1129
1048
perror("print_out_password");
1130
1049
exitstatus = EXIT_FAILURE;
1137
1056
perror("sigaction");
1138
1057
exitstatus = EXIT_FAILURE;
1139
1058
}
1140
1059
1141
1060
if(custom_argv != NULL){
1142
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1143
1062
free(*arg);
1149
1068
closedir(dir);
1150
1069
}
1151
1070
1152
/* Kill the processes */
1071
/* Free the process list and kill the processes */
1153
1072
for(plugin *p = plugin_list; p != NULL; p = p->next){
1154
1073
if(p->pid != 0){
1155
1074
close(p->fd);
1162
1081
}
1163
1082
1164
1083
/* Wait for any remaining child processes to terminate */
1165
do {
1084
do{
1166
1085
ret = wait(NULL);
1167
1086
} while(ret >= 0);
1168
1087
if(errno != ECHILD){
1169
1088
perror("wait");
1170
1089
}
1171
1090
1172
1091
free_plugin_list();
1173
1092
1174
1093
free(plugindir);
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0