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- Committer: Björn Påhlsson
- Date: 2008-09-05 19:30:21 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- 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;
105
111
if (new_plugin == NULL){
106
112
return NULL;
107
113
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
111
120
}
112
121
113
122
*new_plugin = (plugin) { .name = copy_name,
114
123
.argc = 1,
115
.envc = 0,
116
124
.disabled = false,
117
.next = *plugin_list };
125
.next = plugin_list };
118
126
119
127
new_plugin->argv = malloc(sizeof(char *) * 2);
120
128
if (new_plugin->argv == NULL){
129
free(copy_name);
121
130
free(new_plugin);
122
131
return NULL;
123
132
}
124
133
new_plugin->argv[0] = copy_name;
125
134
new_plugin->argv[1] = NULL;
126
135
127
136
new_plugin->environ = malloc(sizeof(char *));
128
137
if(new_plugin->environ == NULL){
138
free(copy_name);
129
139
free(new_plugin->argv);
130
140
free(new_plugin);
131
141
return NULL;
132
142
}
133
143
new_plugin->environ[0] = NULL;
144
134
145
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
136
147
return new_plugin;
137
148
}
138
149
168
179
}
169
180
170
181
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
172
183
if(p == NULL){
173
184
return false;
174
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
}
175
203
return add_to_char_array(def, &(p->environ), &(p->envc));
176
204
}
177
205
178
179
206
/*
180
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
208
* Descriptor Flags".
192
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
220
}
194
221
195
process *process_list = NULL;
196
222
197
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
198
224
status. */
199
225
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
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
}
216
253
}
217
254
255
/* Prints out a password to stdout */
218
256
bool print_out_password(const char *buffer, size_t length){
219
257
ssize_t ret;
220
258
if(length>0 and buffer[length-1] == '\n'){
230
268
return true;
231
269
}
232
270
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
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
}
239
295
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
296
}
297
298
free(plugin_node);
252
299
}
253
300
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
268
305
}
269
306
270
307
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
273
310
FILE *conffp;
274
311
size_t d_name_len;
275
312
DIR *dir = NULL;
298
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
336
if(ret == -1){
300
337
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
338
exitstatus = EXIT_FAILURE;
302
339
goto fallback;
303
340
}
304
341
307
344
{ .name = "global-options", .key = 'g',
308
345
.arg = "OPTION[,OPTION[,...]]",
309
346
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'G',
311
348
.arg = "VAR=value",
312
349
.doc = "Environment variable passed to all plugins" },
313
350
{ .name = "options-for", .key = 'o',
314
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
352
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'E',
317
354
.arg = "PLUGIN:ENV=value",
318
355
.doc = "Environment variable passed to specified plugin" },
319
356
{ .name = "disable", .key = 'd',
320
357
.arg = "PLUGIN",
321
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
322
362
{ .name = "plugin-dir", .key = 128,
323
363
.arg = "DIRECTORY",
324
364
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.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 },
333
376
{ .name = NULL }
334
377
};
335
378
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
340
381
switch (key) {
341
case 'g':
382
case 'g': /* --global-options */
342
383
if (arg != NULL){
343
384
char *p;
344
385
while((p = strsep(&arg, ",")) != NULL){
345
386
if(p[0] == '\0'){
346
387
continue;
347
388
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
389
if(not add_argument(getplugin(NULL), p)){
349
390
perror("add_argument");
350
391
return ARGP_ERR_UNKNOWN;
351
392
}
352
393
}
353
394
}
354
395
break;
355
case 'e':
396
case 'G': /* --global-env */
356
397
if(arg == NULL){
357
398
break;
358
399
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
400
if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
367
402
}
368
403
break;
369
case 'o':
404
case 'o': /* --options-for */
370
405
if (arg != NULL){
371
406
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
407
if(p_name[0] == '\0' or arg == NULL){
373
408
break;
374
409
}
375
410
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
411
if(opt[0] == '\0' or opt == NULL){
377
412
break;
378
413
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
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;
389
422
}
390
423
}
391
424
}
392
425
break;
393
case 'f':
426
case 'E': /* --env-for */
394
427
if(arg == NULL){
395
428
break;
396
429
}
399
432
if(envdef == NULL){
400
433
break;
401
434
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
435
*envdef = '\0';
436
if(not add_environment(getplugin(arg), envdef+1, true)){
408
437
perror("add_environment");
409
438
}
410
439
}
411
440
break;
412
case 'd':
441
case 'd': /* --disable */
413
442
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
443
plugin *p = getplugin(arg);
415
444
if(p == NULL){
416
445
return ARGP_ERR_UNKNOWN;
417
446
}
418
447
p->disabled = true;
419
448
}
420
449
break;
421
case 128:
422
plugindir = arg;
423
break;
424
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 */
425
470
uid = (uid_t)strtol(arg, NULL, 10);
426
471
break;
427
case 130:
472
case 131: /* --groupid */
428
473
gid = (gid_t)strtol(arg, NULL, 10);
429
474
break;
430
case 131:
475
case 132: /* --debug */
431
476
debug = true;
432
477
break;
433
478
case ARGP_KEY_ARG:
441
486
return 0;
442
487
}
443
488
444
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
}
445
521
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
448
525
.doc = "Mandos plugin runner -- Run plugins" };
449
526
450
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);
451
530
if (ret == ARGP_ERR_UNKNOWN){
452
531
fprintf(stderr, "Unknown error while parsing arguments\n");
453
532
exitstatus = EXIT_FAILURE;
454
533
goto fallback;
455
534
}
456
457
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
}
458
545
if(conffp != NULL){
459
546
char *org_line = NULL;
460
547
char *p, *arg, *new_arg, *line;
463
550
const char whitespace_delims[] = " \r\t\f\v\n";
464
551
const char comment_delim[] = "#";
465
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 */
466
565
while(true){
467
566
sret = getline(&org_line, &size, conffp);
468
567
if(sret == -1){
476
575
continue;
477
576
}
478
577
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
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;
485
596
}
486
597
}
487
598
free(org_line);
488
} else{
599
} else {
489
600
/* Check for harmful errors and go to fallback. Other errors might
490
601
not affect opening plugins */
491
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
494
605
goto fallback;
495
606
}
496
607
}
497
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
498
610
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
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);
501
613
if (ret == ARGP_ERR_UNKNOWN){
502
614
fprintf(stderr, "Unknown error while parsing arguments\n");
503
615
exitstatus = EXIT_FAILURE;
505
617
}
506
618
}
507
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
508
629
if(debug){
509
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
519
640
}
520
641
}
521
642
643
/* Strip permissions down to nobody */
522
644
ret = setuid(uid);
523
645
if (ret == -1){
524
646
perror("setuid");
525
}
526
647
}
527
648
setgid(gid);
528
649
if (ret == -1){
529
650
perror("setgid");
530
651
}
531
652
532
dir = opendir(plugindir);
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
533
659
if(dir == NULL){
534
660
perror("Could not open plugin dir");
535
661
exitstatus = EXIT_FAILURE;
551
677
552
678
FD_ZERO(&rfds_all);
553
679
680
/* Read and execute any executable in the plugin directory*/
554
681
while(true){
555
682
dirst = readdir(dir);
556
683
557
// All directory entries have been processed
684
/* All directory entries have been processed */
558
685
if(dirst == NULL){
559
686
if (errno == EBADF){
560
687
perror("readdir");
566
693
567
694
d_name_len = strlen(dirst->d_name);
568
695
569
// Ignore dotfiles, backup files and other junk
696
/* Ignore dotfiles, backup files and other junk */
570
697
{
571
698
bool bad_name = false;
572
699
587
714
break;
588
715
}
589
716
}
590
591
717
if(bad_name){
592
718
continue;
593
719
}
594
595
720
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
721
size_t suf_len = strlen(*suf);
597
722
if((d_name_len >= suf_len)
624
749
free(filename);
625
750
continue;
626
751
}
627
752
753
/* Ignore non-executable files */
628
754
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
755
if(debug){
630
756
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
633
759
free(filename);
634
760
continue;
635
761
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
762
763
plugin *p = getplugin(dirst->d_name);
637
764
if(p == NULL){
638
765
perror("getplugin");
639
766
free(filename);
649
776
}
650
777
{
651
778
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
779
plugin *g = getplugin(NULL);
653
780
if(g != NULL){
654
781
for(char **a = g->argv + 1; *a != NULL; a++){
655
782
if(not add_argument(p, *a)){
658
785
}
659
786
/* Add global environment variables */
660
787
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
788
if(not add_environment(p, *e, false)){
662
789
perror("add_environment");
663
790
}
664
791
}
669
796
process, too. */
670
797
if(p->environ[0] != NULL){
671
798
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
799
if(not add_environment(p, *e, false)){
678
800
perror("add_environment");
679
801
}
680
802
}
681
803
}
682
804
683
int pipefd[2];
805
int pipefd[2];
684
806
ret = pipe(pipefd);
685
807
if (ret == -1){
686
808
perror("pipe");
687
809
exitstatus = EXIT_FAILURE;
688
810
goto fallback;
689
811
}
812
/* Ask OS to automatic close the pipe on exec */
690
813
ret = set_cloexec_flag(pipefd[0]);
691
814
if(ret < 0){
692
815
perror("set_cloexec_flag");
706
829
exitstatus = EXIT_FAILURE;
707
830
goto fallback;
708
831
}
709
// Starting a new process to be watched
832
/* Starting a new process to be watched */
710
833
pid_t pid = fork();
711
834
if(pid == -1){
712
835
perror("fork");
750
873
}
751
874
/* no return */
752
875
}
753
/* parent process */
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
754
878
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
759
882
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
883
if(ret < 0){
761
perror("sigprocmask");
884
perror("sigprocmask");
762
885
}
763
886
exitstatus = EXIT_FAILURE;
764
887
goto fallback;
765
888
}
766
889
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
772
893
/* Unblock SIGCHLD so signal handler can be run if this process
773
894
has already completed */
774
895
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
899
goto fallback;
779
900
}
780
901
781
FD_SET(new_process->fd, &rfds_all);
902
FD_SET(new_plugin->fd, &rfds_all);
782
903
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
904
if (maxfd < new_plugin->fd){
905
maxfd = new_plugin->fd;
785
906
}
786
907
787
908
}
788
909
789
free_plugin_list(plugin_list);
790
791
910
closedir(dir);
792
911
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
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
}
798
922
}
799
while(process_list){
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
800
926
fd_set rfds = rfds_all;
801
927
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
928
if (select_ret == -1){
806
932
}
807
933
/* OK, now either a process completed, or something can be read
808
934
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
935
for(plugin *proc = plugin_list; proc != NULL;){
810
936
/* Is this process completely done? */
811
937
if(proc->eof and proc->completed){
812
938
/* Only accept the plugin output if it exited cleanly */
813
939
if(not WIFEXITED(proc->status)
814
940
or WEXITSTATUS(proc->status) != 0){
815
941
/* Bad exit by plugin */
942
816
943
if(debug){
817
944
if(WIFEXITED(proc->status)){
818
945
fprintf(stderr, "Plugin %u exited with status %d\n",
827
954
(unsigned int) (proc->pid));
828
955
}
829
956
}
957
830
958
/* Remove the plugin */
831
959
FD_CLR(proc->fd, &rfds_all);
960
832
961
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
963
if(ret < 0){
835
964
perror("sigprocmask");
836
965
exitstatus = EXIT_FAILURE;
837
966
goto fallback;
838
967
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
968
852
969
/* We are done modifying process list, so unblock signal */
853
970
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
971
NULL);
855
972
if(ret < 0){
856
973
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
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;
864
986
}
987
865
988
/* This process exited nicely, so print its buffer */
866
989
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
990
bool bret = print_out_password(proc->buffer,
991
proc->buffer_length);
868
992
if(not bret){
869
993
perror("print_out_password");
870
994
exitstatus = EXIT_FAILURE;
871
995
}
872
996
goto fallback;
873
997
}
998
874
999
/* This process has not completed. Does it have any output? */
875
1000
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1001
/* This process had nothing to say at this time */
1002
proc = proc->next;
877
1003
continue;
878
1004
}
879
1005
/* Before reading, make the process' data buffer large enough */
892
1018
BUFFER_SIZE);
893
1019
if(ret < 0){
894
1020
/* Read error from this process; ignore the error */
1021
proc = proc->next;
895
1022
continue;
896
1023
}
897
1024
if(ret == 0){
906
1033
907
1034
fallback:
908
1035
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* 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 */
911
1039
bool bret;
912
1040
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1041
char *passwordbuffer = getpass("Password: ");
926
1054
}
927
1055
928
1056
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1057
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1058
free(*arg);
931
1059
}
932
1060
free(custom_argv);
933
1061
}
934
free_plugin_list(plugin_list);
935
1062
936
1063
if(dir != NULL){
937
1064
closedir(dir);
938
1065
}
939
1066
940
1067
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
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
}
948
1076
}
949
free(process_list->buffer);
950
free(process_list);
951
1077
}
952
1078
953
1079
/* Wait for any remaining child processes to terminate */
957
1083
if(errno != ECHILD){
958
1084
perror("wait");
959
1085
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
960
1091
961
1092
return exitstatus;
962
1093
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0