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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824231357-e304pw7ls2dnnvw5
* plugin-runner.c (handle_sigchld): Loop until all exited children
have been wait()ed for.
have been wait()ed for.
- files removed:
- .bzrignore
- files modified:
- Makefile
added
removed
plugin-runner.c
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
60
#include <signal.h> /* struct sigaction, sigemptyset(),
62
61
sigaddset(), sigaction(),
63
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
64
#include <errno.h> /* errno, EBADF */
66
65
67
66
#define BUFFER_SIZE 256
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
68
72
69
const char *argp_program_version = "plugin-runner 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
75
struct plugin;
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
76
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
98
if ((p->name == name)
105
99
or (p->name and name and (strcmp(p->name, name) == 0))){
106
100
return p;
121
115
122
116
*new_plugin = (plugin) { .name = copy_name,
123
117
.argc = 1,
118
.envc = 0,
124
119
.disabled = false,
125
.next = plugin_list };
120
.next = *plugin_list };
126
121
127
122
new_plugin->argv = malloc(sizeof(char *) * 2);
128
123
if (new_plugin->argv == NULL){
132
127
}
133
128
new_plugin->argv[0] = copy_name;
134
129
new_plugin->argv[1] = NULL;
135
130
136
131
new_plugin->environ = malloc(sizeof(char *));
137
132
if(new_plugin->environ == NULL){
138
133
free(copy_name);
141
136
return NULL;
142
137
}
143
138
new_plugin->environ[0] = NULL;
144
145
139
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
147
141
return new_plugin;
148
142
}
149
143
179
173
}
180
174
181
175
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
183
177
if(p == NULL){
184
178
return false;
185
179
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
180
return add_to_char_array(def, &(p->environ), &(p->envc));
204
181
}
205
182
183
206
184
/*
207
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
186
* Descriptor Flags".
219
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
198
}
221
199
200
process *process_list = NULL;
222
201
223
/* Mark processes as completed when they exit, and save their exit
202
/* Mark processes as completed when it exits, and save its exit
224
203
status. */
225
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
226
206
while(true){
227
plugin *proc = plugin_list;
228
207
int status;
229
208
pid_t pid = waitpid(-1, &status, WNOHANG);
230
209
if(pid == 0){
231
/* Only still running child processes */
232
210
break;
233
211
}
234
212
if(pid == -1){
235
213
if (errno != ECHILD){
236
214
perror("waitpid");
237
215
}
238
/* No child processes */
239
break;
216
return;
240
217
}
241
242
/* A child exited, find it in process_list */
218
243
219
while(proc != NULL and proc->pid != pid){
244
220
proc = proc->next;
245
221
}
252
228
}
253
229
}
254
230
255
/* Prints out a password to stdout */
256
231
bool print_out_password(const char *buffer, size_t length){
257
232
ssize_t ret;
258
233
if(length>0 and buffer[length-1] == '\n'){
268
243
return true;
269
244
}
270
245
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
246
char **add_to_argv(char **argv, int *argc, char *arg){
247
if (argv == NULL){
248
*argc = 1;
249
argv = malloc(sizeof(char*) * 2);
250
if(argv == NULL){
251
return NULL;
295
252
}
296
}
297
298
free(plugin_node);
253
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
254
argv[1] = NULL;
255
}
256
*argc += 1;
257
argv = realloc(argv, sizeof(char *)
258
* ((unsigned int) *argc + 1));
259
if(argv == NULL){
260
return NULL;
261
}
262
argv[*argc-1] = arg;
263
argv[*argc] = NULL;
264
return argv;
299
265
}
300
266
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
267
static void free_plugin_list(plugin *plugin_list){
268
for(plugin *next; plugin_list != NULL; plugin_list = next){
269
next = plugin_list->next;
270
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
271
free(*arg);
272
}
273
free(plugin_list->argv);
274
for(char **env = plugin_list->environ; *env != NULL; env++){
275
free(*env);
276
}
277
free(plugin_list->environ);
278
free(plugin_list);
304
279
}
305
280
}
306
281
307
282
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
310
285
FILE *conffp;
311
286
size_t d_name_len;
312
287
DIR *dir = NULL;
344
319
{ .name = "global-options", .key = 'g',
345
320
.arg = "OPTION[,OPTION[,...]]",
346
321
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
348
323
.arg = "VAR=value",
349
324
.doc = "Environment variable passed to all plugins" },
350
325
{ .name = "options-for", .key = 'o',
351
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
327
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
354
329
.arg = "PLUGIN:ENV=value",
355
330
.doc = "Environment variable passed to specified plugin" },
356
331
{ .name = "disable", .key = 'd',
357
332
.arg = "PLUGIN",
358
333
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
334
{ .name = "plugin-dir", .key = 128,
363
335
.arg = "DIRECTORY",
364
336
.doc = "Specify a different plugin directory", .group = 2 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
376
345
{ .name = NULL }
377
346
};
378
347
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
381
352
switch (key) {
382
case 'g': /* --global-options */
353
case 'g':
383
354
if (arg != NULL){
384
355
char *p;
385
356
while((p = strsep(&arg, ",")) != NULL){
386
357
if(p[0] == '\0'){
387
358
continue;
388
359
}
389
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
390
361
perror("add_argument");
391
362
return ARGP_ERR_UNKNOWN;
392
363
}
393
364
}
394
365
}
395
366
break;
396
case 'G': /* --global-env */
367
case 'e':
397
368
if(arg == NULL){
398
369
break;
399
370
}
400
if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
371
{
372
char *envdef = strdup(arg);
373
if(envdef == NULL){
374
break;
375
}
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
378
}
402
379
}
403
380
break;
404
case 'o': /* --options-for */
381
case 'o':
405
382
if (arg != NULL){
406
383
char *p_name = strsep(&arg, ":");
407
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
408
385
break;
409
386
}
410
387
char *opt = strsep(&arg, ":");
411
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
412
389
break;
413
390
}
414
char *p;
415
while((p = strsep(&opt, ",")) != NULL){
416
if(p[0] == '\0'){
417
continue;
418
}
419
if(not add_argument(getplugin(p_name), p)){
420
perror("add_argument");
421
return ARGP_ERR_UNKNOWN;
391
if(opt != NULL){
392
char *p;
393
while((p = strsep(&opt, ",")) != NULL){
394
if(p[0] == '\0'){
395
continue;
396
}
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
400
}
422
401
}
423
402
}
424
403
}
425
404
break;
426
case 'E': /* --env-for */
405
case 'f':
427
406
if(arg == NULL){
428
407
break;
429
408
}
432
411
if(envdef == NULL){
433
412
break;
434
413
}
435
*envdef = '\0';
436
if(not add_environment(getplugin(arg), envdef+1, true)){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
415
if(p_name == NULL){
416
break;
417
}
418
envdef++;
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
437
420
perror("add_environment");
438
421
}
439
422
}
440
423
break;
441
case 'd': /* --disable */
424
case 'd':
442
425
if (arg != NULL){
443
plugin *p = getplugin(arg);
426
plugin *p = getplugin(arg, plugins);
444
427
if(p == NULL){
445
428
return ARGP_ERR_UNKNOWN;
446
429
}
447
430
p->disabled = true;
448
431
}
449
432
break;
450
case 'e': /* --enable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = false;
457
}
458
break;
459
case 128: /* --plugin-dir */
460
free(plugindir);
461
plugindir = strdup(arg);
462
if(plugindir == NULL){
463
perror("strdup");
464
}
465
break;
466
case 129: /* --config-file */
467
/* This is already done by parse_opt_config_file() */
468
break;
469
case 130: /* --userid */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
470
437
uid = (uid_t)strtol(arg, NULL, 10);
471
438
break;
472
case 131: /* --groupid */
439
case 130:
473
440
gid = (gid_t)strtol(arg, NULL, 10);
474
441
break;
475
case 132: /* --debug */
442
case 131:
476
443
debug = true;
477
444
break;
478
445
case ARGP_KEY_ARG:
486
453
return 0;
487
454
}
488
455
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
456
plugin *plugin_list = NULL;
521
457
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
460
.doc = "Mandos plugin runner -- Run plugins" };
526
461
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
463
if (ret == ARGP_ERR_UNKNOWN){
531
464
fprintf(stderr, "Unknown error while parsing arguments\n");
532
465
exitstatus = EXIT_FAILURE;
533
466
goto fallback;
534
467
}
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
468
469
conffp = fopen(argfile, "r");
545
470
if(conffp != NULL){
546
471
char *org_line = NULL;
547
472
char *p, *arg, *new_arg, *line;
550
475
const char whitespace_delims[] = " \r\t\f\v\n";
551
476
const char comment_delim[] = "#";
552
477
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
478
while(true){
566
479
sret = getline(&org_line, &size, conffp);
567
480
if(sret == -1){
575
488
continue;
576
489
}
577
490
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
495
goto fallback;
496
}
596
497
}
597
498
}
598
499
free(org_line);
599
} else {
500
} else{
600
501
/* Check for harmful errors and go to fallback. Other errors might
601
502
not affect opening plugins */
602
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
605
506
goto fallback;
606
507
}
607
508
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
509
610
510
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
513
if (ret == ARGP_ERR_UNKNOWN){
614
514
fprintf(stderr, "Unknown error while parsing arguments\n");
615
515
exitstatus = EXIT_FAILURE;
617
517
}
618
518
}
619
519
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
520
if(debug){
630
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
531
}
641
532
}
642
533
643
/* Strip permissions down to nobody */
644
534
ret = setuid(uid);
645
535
if (ret == -1){
646
536
perror("setuid");
647
}
537
}
538
648
539
setgid(gid);
649
540
if (ret == -1){
650
541
perror("setgid");
651
542
}
652
543
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
544
dir = opendir(plugindir);
659
545
if(dir == NULL){
660
546
perror("Could not open plugin dir");
661
547
exitstatus = EXIT_FAILURE;
677
563
678
564
FD_ZERO(&rfds_all);
679
565
680
/* Read and execute any executable in the plugin directory*/
681
566
while(true){
682
567
dirst = readdir(dir);
683
568
684
/* All directory entries have been processed */
569
// All directory entries have been processed
685
570
if(dirst == NULL){
686
571
if (errno == EBADF){
687
572
perror("readdir");
693
578
694
579
d_name_len = strlen(dirst->d_name);
695
580
696
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
697
582
{
698
583
bool bad_name = false;
699
584
714
599
break;
715
600
}
716
601
}
602
717
603
if(bad_name){
718
604
continue;
719
605
}
606
720
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
608
size_t suf_len = strlen(*suf);
722
609
if((d_name_len >= suf_len)
749
636
free(filename);
750
637
continue;
751
638
}
752
753
/* Ignore non-executable files */
639
754
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
755
641
if(debug){
756
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
645
free(filename);
760
646
continue;
761
647
}
762
763
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
764
649
if(p == NULL){
765
650
perror("getplugin");
766
651
free(filename);
776
661
}
777
662
{
778
663
/* Add global arguments to argument list for this plugin */
779
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
780
665
if(g != NULL){
781
666
for(char **a = g->argv + 1; *a != NULL; a++){
782
667
if(not add_argument(p, *a)){
785
670
}
786
671
/* Add global environment variables */
787
672
for(char **e = g->environ; *e != NULL; e++){
788
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
789
674
perror("add_environment");
790
675
}
791
676
}
796
681
process, too. */
797
682
if(p->environ[0] != NULL){
798
683
for(char **e = environ; *e != NULL; e++){
799
if(not add_environment(p, *e, false)){
684
char *copy = strdup(*e);
685
if(copy == NULL){
686
perror("strdup");
687
continue;
688
}
689
if(not add_environment(p, copy)){
800
690
perror("add_environment");
801
691
}
802
692
}
809
699
exitstatus = EXIT_FAILURE;
810
700
goto fallback;
811
701
}
812
/* Ask OS to automatic close the pipe on exec */
813
702
ret = set_cloexec_flag(pipefd[0]);
814
703
if(ret < 0){
815
704
perror("set_cloexec_flag");
829
718
exitstatus = EXIT_FAILURE;
830
719
goto fallback;
831
720
}
832
/* Starting a new process to be watched */
721
// Starting a new process to be watched
833
722
pid_t pid = fork();
834
723
if(pid == -1){
835
724
perror("fork");
873
762
}
874
763
/* no return */
875
764
}
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
878
766
free(filename);
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
770
perror("malloc");
882
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
883
772
if(ret < 0){
884
perror("sigprocmask");
773
perror("sigprocmask");
885
774
}
886
775
exitstatus = EXIT_FAILURE;
887
776
goto fallback;
888
777
}
889
778
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
893
784
/* Unblock SIGCHLD so signal handler can be run if this process
894
785
has already completed */
895
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
899
790
goto fallback;
900
791
}
901
792
902
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
903
794
904
if (maxfd < new_plugin->fd){
905
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
906
797
}
907
798
908
799
}
909
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
910
804
closedir(dir);
911
805
dir = NULL;
912
913
for(plugin *p = plugin_list; p != NULL; p = p->next){
914
if(p->pid != 0){
915
break;
916
}
917
if(p->next == NULL){
918
fprintf(stderr, "No plugin processes started. Incorrect plugin"
919
" directory?\n");
920
free_plugin_list();
921
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
922
811
}
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
812
while(process_list){
926
813
fd_set rfds = rfds_all;
927
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
928
815
if (select_ret == -1){
932
819
}
933
820
/* OK, now either a process completed, or something can be read
934
821
from one of them */
935
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
936
823
/* Is this process completely done? */
937
824
if(proc->eof and proc->completed){
938
825
/* Only accept the plugin output if it exited cleanly */
939
826
if(not WIFEXITED(proc->status)
940
827
or WEXITSTATUS(proc->status) != 0){
941
828
/* Bad exit by plugin */
942
943
829
if(debug){
944
830
if(WIFEXITED(proc->status)){
945
831
fprintf(stderr, "Plugin %u exited with status %d\n",
954
840
(unsigned int) (proc->pid));
955
841
}
956
842
}
957
958
843
/* Remove the plugin */
959
844
FD_CLR(proc->fd, &rfds_all);
960
961
845
/* Block signal while modifying process_list */
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
847
if(ret < 0){
964
848
perror("sigprocmask");
965
849
exitstatus = EXIT_FAILURE;
966
850
goto fallback;
967
851
}
968
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
856
} else {
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
859
if(p->next == proc){
860
p->next = proc->next;
861
break;
862
}
863
}
864
}
969
865
/* We are done modifying process list, so unblock signal */
970
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
971
867
NULL);
972
868
if(ret < 0){
973
869
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
975
goto fallback;
976
}
977
978
if(plugin_list == NULL){
979
break;
980
}
981
982
plugin *next_plugin = proc->next;
983
free_plugin(proc);
984
proc = next_plugin;
985
continue;
870
}
871
free(proc->buffer);
872
free(proc);
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
875
the process list */
876
break;
986
877
}
987
988
878
/* This process exited nicely, so print its buffer */
989
879
990
bool bret = print_out_password(proc->buffer,
991
proc->buffer_length);
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
992
881
if(not bret){
993
882
perror("print_out_password");
994
883
exitstatus = EXIT_FAILURE;
995
884
}
996
885
goto fallback;
997
886
}
998
999
887
/* This process has not completed. Does it have any output? */
1000
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1001
889
/* This process had nothing to say at this time */
1002
proc = proc->next;
1003
890
continue;
1004
891
}
1005
892
/* Before reading, make the process' data buffer large enough */
1018
905
BUFFER_SIZE);
1019
906
if(ret < 0){
1020
907
/* Read error from this process; ignore the error */
1021
proc = proc->next;
1022
908
continue;
1023
909
}
1024
910
if(ret == 0){
1033
919
1034
920
fallback:
1035
921
1036
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1037
/* Fallback if all plugins failed, none are found or an error
1038
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1039
924
bool bret;
1040
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1041
926
char *passwordbuffer = getpass("Password: ");
1054
939
}
1055
940
1056
941
if(custom_argv != NULL){
1057
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1058
943
free(*arg);
1059
944
}
1060
945
free(custom_argv);
1061
946
}
947
free_plugin_list(plugin_list);
1062
948
1063
949
if(dir != NULL){
1064
950
closedir(dir);
1065
951
}
1066
952
1067
953
/* Free the process list and kill the processes */
1068
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
if(p->pid != 0){
1070
close(p->fd);
1071
ret = kill(p->pid, SIGTERM);
1072
if(ret == -1 and errno != ESRCH){
1073
/* Set-uid proccesses might not get closed */
1074
perror("kill");
1075
}
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
perror("kill");
1076
961
}
962
free(process_list->buffer);
963
free(process_list);
1077
964
}
1078
965
1079
966
/* Wait for any remaining child processes to terminate */
1083
970
if(errno != ECHILD){
1084
971
perror("wait");
1085
972
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
1091
973
1092
974
return exitstatus;
1093
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0