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- Committer: Björn Påhlsson
- Date: 2008-09-05 19:30:21 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 176.
- Revision ID: belorn@braxen-20080905193021-vie7b22ootg6r2t8
Several memory leaks detected by valgrind fixed
A bugg fixed that could cause seg fault.
A bugg fixed that could cause seg fault.
- files added:
- .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, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
61
#include <signal.h> /* struct sigaction, sigemptyset(),
61
62
sigaddset(), sigaction(),
62
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
#include <errno.h> /* errno, EBADF */
65
66
66
67
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
71
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
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;
75
struct plugin;
85
76
86
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
90
81
char **environ;
91
82
int envc;
92
83
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;
93
94
struct plugin *next;
94
95
} plugin;
95
96
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
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){
98
104
if ((p->name == name)
99
105
or (p->name and name and (strcmp(p->name, name) == 0))){
100
106
return p;
108
114
char *copy_name = NULL;
109
115
if(name != NULL){
110
116
copy_name = strdup(name);
111
}
112
if(copy_name == NULL){
113
return NULL;
117
if(copy_name == NULL){
118
return NULL;
119
}
114
120
}
115
121
116
122
*new_plugin = (plugin) { .name = copy_name,
117
123
.argc = 1,
118
.envc = 0,
119
124
.disabled = false,
120
.next = *plugin_list };
125
.next = plugin_list };
121
126
122
127
new_plugin->argv = malloc(sizeof(char *) * 2);
123
128
if (new_plugin->argv == NULL){
127
132
}
128
133
new_plugin->argv[0] = copy_name;
129
134
new_plugin->argv[1] = NULL;
130
135
131
136
new_plugin->environ = malloc(sizeof(char *));
132
137
if(new_plugin->environ == NULL){
133
138
free(copy_name);
136
141
return NULL;
137
142
}
138
143
new_plugin->environ[0] = NULL;
144
139
145
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
141
147
return new_plugin;
142
148
}
143
149
173
179
}
174
180
175
181
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
177
183
if(p == NULL){
178
184
return false;
179
185
}
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
}
180
203
return add_to_char_array(def, &(p->environ), &(p->envc));
181
204
}
182
205
183
184
206
/*
185
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
208
* Descriptor Flags".
197
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
198
220
}
199
221
200
process *process_list = NULL;
201
222
202
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
203
224
status. */
204
225
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
221
253
}
222
254
255
/* Prints out a password to stdout */
223
256
bool print_out_password(const char *buffer, size_t length){
224
257
ssize_t ret;
225
258
if(length>0 and buffer[length-1] == '\n'){
235
268
return true;
236
269
}
237
270
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
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
}
244
295
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
296
}
297
298
free(plugin_node);
257
299
}
258
300
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
free(plugin_list->name);
263
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
264
free(*arg);
265
}
266
free(plugin_list->argv);
267
for(char **env = plugin_list->environ; *env != NULL; env++){
268
free(*env);
269
}
270
free(plugin_list->environ);
271
free(plugin_list);
272
}
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
273
305
}
274
306
275
307
int main(int argc, char *argv[]){
276
const char *plugindir = "/lib/mandos/plugins.d";
277
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
278
310
FILE *conffp;
279
311
size_t d_name_len;
280
312
DIR *dir = NULL;
303
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
304
336
if(ret == -1){
305
337
perror("sigaction");
306
exitstatus = EXIT_FAILURE;
338
exitstatus = EXIT_FAILURE;
307
339
goto fallback;
308
340
}
309
341
312
344
{ .name = "global-options", .key = 'g',
313
345
.arg = "OPTION[,OPTION[,...]]",
314
346
.doc = "Options passed to all plugins" },
315
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'G',
316
348
.arg = "VAR=value",
317
349
.doc = "Environment variable passed to all plugins" },
318
350
{ .name = "options-for", .key = 'o',
319
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
320
352
.doc = "Options passed only to specified plugin" },
321
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'E',
322
354
.arg = "PLUGIN:ENV=value",
323
355
.doc = "Environment variable passed to specified plugin" },
324
356
{ .name = "disable", .key = 'd',
325
357
.arg = "PLUGIN",
326
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
327
362
{ .name = "plugin-dir", .key = 128,
328
363
.arg = "DIRECTORY",
329
364
.doc = "Specify a different plugin directory", .group = 2 },
330
{ .name = "userid", .key = 129,
331
.arg = "ID", .flags = 0,
332
.doc = "User ID the plugins will run as", .group = 2 },
333
{ .name = "groupid", .key = 130,
334
.arg = "ID", .flags = 0,
335
.doc = "Group ID the plugins will run as", .group = 2 },
336
{ .name = "debug", .key = 131,
337
.doc = "Debug mode", .group = 3 },
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 },
338
376
{ .name = NULL }
339
377
};
340
378
341
error_t parse_opt (int key, char *arg, struct argp_state *state) {
342
/* Get the INPUT argument from `argp_parse', which we know is a
343
pointer to our plugin list pointer. */
344
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
345
381
switch (key) {
346
case 'g':
382
case 'g': /* --global-options */
347
383
if (arg != NULL){
348
384
char *p;
349
385
while((p = strsep(&arg, ",")) != NULL){
350
386
if(p[0] == '\0'){
351
387
continue;
352
388
}
353
if(not add_argument(getplugin(NULL, plugins), p)){
389
if(not add_argument(getplugin(NULL), p)){
354
390
perror("add_argument");
355
391
return ARGP_ERR_UNKNOWN;
356
392
}
357
393
}
358
394
}
359
395
break;
360
case 'e':
396
case 'G': /* --global-env */
361
397
if(arg == NULL){
362
398
break;
363
399
}
364
{
365
char *envdef = strdup(arg);
366
if(envdef == NULL){
367
break;
368
}
369
if(not add_environment(getplugin(NULL, plugins), envdef)){
370
perror("add_environment");
371
}
400
if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
372
402
}
373
403
break;
374
case 'o':
404
case 'o': /* --options-for */
375
405
if (arg != NULL){
376
406
char *p_name = strsep(&arg, ":");
377
if(p_name[0] == '\0'){
407
if(p_name[0] == '\0' or arg == NULL){
378
408
break;
379
409
}
380
410
char *opt = strsep(&arg, ":");
381
if(opt[0] == '\0'){
411
if(opt[0] == '\0' or opt == NULL){
382
412
break;
383
413
}
384
if(opt != NULL){
385
char *p;
386
while((p = strsep(&opt, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(p_name, plugins), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
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;
394
422
}
395
423
}
396
424
}
397
425
break;
398
case 'f':
426
case 'E': /* --env-for */
399
427
if(arg == NULL){
400
428
break;
401
429
}
404
432
if(envdef == NULL){
405
433
break;
406
434
}
407
char *p_name = strndup(arg, (size_t) (envdef-arg));
408
if(p_name == NULL){
409
break;
410
}
411
envdef++;
412
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
*envdef = '\0';
436
if(not add_environment(getplugin(arg), envdef+1, true)){
413
437
perror("add_environment");
414
438
}
415
439
}
416
440
break;
417
case 'd':
441
case 'd': /* --disable */
418
442
if (arg != NULL){
419
plugin *p = getplugin(arg, plugins);
443
plugin *p = getplugin(arg);
420
444
if(p == NULL){
421
445
return ARGP_ERR_UNKNOWN;
422
446
}
423
447
p->disabled = true;
424
448
}
425
449
break;
426
case 128:
427
plugindir = arg;
428
break;
429
case 129:
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 */
430
470
uid = (uid_t)strtol(arg, NULL, 10);
431
471
break;
432
case 130:
472
case 131: /* --groupid */
433
473
gid = (gid_t)strtol(arg, NULL, 10);
434
474
break;
435
case 131:
475
case 132: /* --debug */
436
476
debug = true;
437
477
break;
438
478
case ARGP_KEY_ARG:
446
486
return 0;
447
487
}
448
488
449
plugin *plugin_list = NULL;
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
}
450
521
451
struct argp argp = { .options = options, .parser = parse_opt,
452
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
453
525
.doc = "Mandos plugin runner -- Run plugins" };
454
526
455
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
456
530
if (ret == ARGP_ERR_UNKNOWN){
457
531
fprintf(stderr, "Unknown error while parsing arguments\n");
458
532
exitstatus = EXIT_FAILURE;
459
533
goto fallback;
460
534
}
461
462
conffp = fopen(argfile, "r");
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
}
463
545
if(conffp != NULL){
464
546
char *org_line = NULL;
465
547
char *p, *arg, *new_arg, *line;
468
550
const char whitespace_delims[] = " \r\t\f\v\n";
469
551
const char comment_delim[] = "#";
470
552
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 */
471
565
while(true){
472
566
sret = getline(&org_line, &size, conffp);
473
567
if(sret == -1){
481
575
continue;
482
576
}
483
577
new_arg = strdup(p);
484
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
485
if (custom_argv == NULL){
486
perror("add_to_argv");
487
exitstatus = EXIT_FAILURE;
488
goto fallback;
489
}
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;
490
596
}
491
597
}
492
598
free(org_line);
493
} else{
599
} else {
494
600
/* Check for harmful errors and go to fallback. Other errors might
495
601
not affect opening plugins */
496
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
499
605
goto fallback;
500
606
}
501
607
}
502
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
503
610
if(custom_argv != NULL){
504
custom_argv[0] = argv[0];
505
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
506
613
if (ret == ARGP_ERR_UNKNOWN){
507
614
fprintf(stderr, "Unknown error while parsing arguments\n");
508
615
exitstatus = EXIT_FAILURE;
510
617
}
511
618
}
512
619
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
513
629
if(debug){
514
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
515
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
524
640
}
525
641
}
526
642
643
/* Strip permissions down to nobody */
527
644
ret = setuid(uid);
528
645
if (ret == -1){
529
646
perror("setuid");
530
}
531
647
}
532
648
setgid(gid);
533
649
if (ret == -1){
534
650
perror("setgid");
535
651
}
536
652
537
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
538
659
if(dir == NULL){
539
660
perror("Could not open plugin dir");
540
661
exitstatus = EXIT_FAILURE;
556
677
557
678
FD_ZERO(&rfds_all);
558
679
680
/* Read and execute any executable in the plugin directory*/
559
681
while(true){
560
682
dirst = readdir(dir);
561
683
562
// All directory entries have been processed
684
/* All directory entries have been processed */
563
685
if(dirst == NULL){
564
686
if (errno == EBADF){
565
687
perror("readdir");
571
693
572
694
d_name_len = strlen(dirst->d_name);
573
695
574
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
575
697
{
576
698
bool bad_name = false;
577
699
592
714
break;
593
715
}
594
716
}
595
596
717
if(bad_name){
597
718
continue;
598
719
}
599
600
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
601
721
size_t suf_len = strlen(*suf);
602
722
if((d_name_len >= suf_len)
629
749
free(filename);
630
750
continue;
631
751
}
632
752
753
/* Ignore non-executable files */
633
754
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
634
755
if(debug){
635
756
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
638
759
free(filename);
639
760
continue;
640
761
}
641
plugin *p = getplugin(dirst->d_name, &plugin_list);
762
763
plugin *p = getplugin(dirst->d_name);
642
764
if(p == NULL){
643
765
perror("getplugin");
644
766
free(filename);
654
776
}
655
777
{
656
778
/* Add global arguments to argument list for this plugin */
657
plugin *g = getplugin(NULL, &plugin_list);
779
plugin *g = getplugin(NULL);
658
780
if(g != NULL){
659
781
for(char **a = g->argv + 1; *a != NULL; a++){
660
782
if(not add_argument(p, *a)){
663
785
}
664
786
/* Add global environment variables */
665
787
for(char **e = g->environ; *e != NULL; e++){
666
if(not add_environment(p, *e)){
788
if(not add_environment(p, *e, false)){
667
789
perror("add_environment");
668
790
}
669
791
}
674
796
process, too. */
675
797
if(p->environ[0] != NULL){
676
798
for(char **e = environ; *e != NULL; e++){
677
char *copy = strdup(*e);
678
if(copy == NULL){
679
perror("strdup");
680
continue;
681
}
682
if(not add_environment(p, copy)){
799
if(not add_environment(p, *e, false)){
683
800
perror("add_environment");
684
801
}
685
802
}
686
803
}
687
804
688
int pipefd[2];
805
int pipefd[2];
689
806
ret = pipe(pipefd);
690
807
if (ret == -1){
691
808
perror("pipe");
692
809
exitstatus = EXIT_FAILURE;
693
810
goto fallback;
694
811
}
812
/* Ask OS to automatic close the pipe on exec */
695
813
ret = set_cloexec_flag(pipefd[0]);
696
814
if(ret < 0){
697
815
perror("set_cloexec_flag");
711
829
exitstatus = EXIT_FAILURE;
712
830
goto fallback;
713
831
}
714
// Starting a new process to be watched
832
/* Starting a new process to be watched */
715
833
pid_t pid = fork();
716
834
if(pid == -1){
717
835
perror("fork");
755
873
}
756
874
/* no return */
757
875
}
758
/* parent process */
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
759
878
free(filename);
760
close(pipefd[1]); /* close unused write end of pipe */
761
process *new_process = malloc(sizeof(process));
762
if (new_process == NULL){
763
perror("malloc");
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
764
882
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
765
883
if(ret < 0){
766
perror("sigprocmask");
884
perror("sigprocmask");
767
885
}
768
886
exitstatus = EXIT_FAILURE;
769
887
goto fallback;
770
888
}
771
889
772
*new_process = (struct process){ .pid = pid,
773
.fd = pipefd[0],
774
.next = process_list };
775
// List handling
776
process_list = new_process;
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
777
893
/* Unblock SIGCHLD so signal handler can be run if this process
778
894
has already completed */
779
895
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
783
899
goto fallback;
784
900
}
785
901
786
FD_SET(new_process->fd, &rfds_all);
902
FD_SET(new_plugin->fd, &rfds_all);
787
903
788
if (maxfd < new_process->fd){
789
maxfd = new_process->fd;
904
if (maxfd < new_plugin->fd){
905
maxfd = new_plugin->fd;
790
906
}
791
907
792
908
}
793
909
794
free_plugin_list(plugin_list);
795
796
910
closedir(dir);
797
911
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = 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
}
803
922
}
804
while(process_list){
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
805
926
fd_set rfds = rfds_all;
806
927
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
928
if (select_ret == -1){
811
932
}
812
933
/* OK, now either a process completed, or something can be read
813
934
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
935
for(plugin *proc = plugin_list; proc != NULL;){
815
936
/* Is this process completely done? */
816
937
if(proc->eof and proc->completed){
817
938
/* Only accept the plugin output if it exited cleanly */
818
939
if(not WIFEXITED(proc->status)
819
940
or WEXITSTATUS(proc->status) != 0){
820
941
/* Bad exit by plugin */
942
821
943
if(debug){
822
944
if(WIFEXITED(proc->status)){
823
945
fprintf(stderr, "Plugin %u exited with status %d\n",
832
954
(unsigned int) (proc->pid));
833
955
}
834
956
}
957
835
958
/* Remove the plugin */
836
959
FD_CLR(proc->fd, &rfds_all);
960
837
961
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
839
963
if(ret < 0){
840
964
perror("sigprocmask");
841
965
exitstatus = EXIT_FAILURE;
842
966
goto fallback;
843
967
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
968
857
969
/* We are done modifying process list, so unblock signal */
858
970
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
971
NULL);
860
972
if(ret < 0){
861
973
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
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;
869
986
}
987
870
988
/* This process exited nicely, so print its buffer */
871
989
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
990
bool bret = print_out_password(proc->buffer,
991
proc->buffer_length);
873
992
if(not bret){
874
993
perror("print_out_password");
875
994
exitstatus = EXIT_FAILURE;
876
995
}
877
996
goto fallback;
878
997
}
998
879
999
/* This process has not completed. Does it have any output? */
880
1000
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1001
/* This process had nothing to say at this time */
1002
proc = proc->next;
882
1003
continue;
883
1004
}
884
1005
/* Before reading, make the process' data buffer large enough */
897
1018
BUFFER_SIZE);
898
1019
if(ret < 0){
899
1020
/* Read error from this process; ignore the error */
1021
proc = proc->next;
900
1022
continue;
901
1023
}
902
1024
if(ret == 0){
911
1033
912
1034
fallback:
913
1035
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1036
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1037
/* Fallback if all plugins failed, none are found or an error
1038
occured */
916
1039
bool bret;
917
1040
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1041
char *passwordbuffer = getpass("Password: ");
931
1054
}
932
1055
933
1056
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1057
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1058
free(*arg);
936
1059
}
937
1060
free(custom_argv);
938
1061
}
939
free_plugin_list(plugin_list);
940
1062
941
1063
if(dir != NULL){
942
1064
closedir(dir);
943
1065
}
944
1066
945
1067
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
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
}
953
1076
}
954
free(process_list->buffer);
955
free(process_list);
956
1077
}
957
1078
958
1079
/* Wait for any remaining child processes to terminate */
962
1083
if(errno != ECHILD){
963
1084
perror("wait");
964
1085
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
965
1091
966
1092
return exitstatus;
967
1093
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0