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- Committer: Teddy Hogeborn
- Date: 2008-08-24 09:40:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080824094058-bdqng3t1e3hfnk2e
* plugin-runner.c (getplugin): Only copy "name" if not NULL. Free
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
"copy_name" if any error occurs.
(free_plugin_list): Do not free "name" member; it it freed as part
of argv.
(main): Set plugin_list to NULL after freeing it.
- files removed:
- .bzr-builddeb
- debian
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- 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
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;
85
75
86
typedef struct plugin{
76
87
char *name; /* can be NULL or any plugin name */
77
88
char **argv;
79
90
char **environ;
80
91
int envc;
81
92
bool disabled;
82
83
/* Variables used for running processes*/
84
pid_t pid;
85
int fd;
86
char *buffer;
87
size_t buffer_size;
88
size_t buffer_length;
89
bool eof;
90
volatile bool completed;
91
volatile int status;
92
93
struct plugin *next;
93
94
} plugin;
94
95
95
static plugin *plugin_list = NULL;
96
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
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){
102
98
if ((p->name == name)
103
99
or (p->name and name and (strcmp(p->name, name) == 0))){
104
100
return p;
119
115
120
116
*new_plugin = (plugin) { .name = copy_name,
121
117
.argc = 1,
118
.envc = 0,
122
119
.disabled = false,
123
.next = plugin_list };
120
.next = *plugin_list };
124
121
125
122
new_plugin->argv = malloc(sizeof(char *) * 2);
126
123
if (new_plugin->argv == NULL){
130
127
}
131
128
new_plugin->argv[0] = copy_name;
132
129
new_plugin->argv[1] = NULL;
133
130
134
131
new_plugin->environ = malloc(sizeof(char *));
135
132
if(new_plugin->environ == NULL){
136
133
free(copy_name);
139
136
return NULL;
140
137
}
141
138
new_plugin->environ[0] = NULL;
142
143
139
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
145
141
return new_plugin;
146
142
}
147
143
177
173
}
178
174
179
175
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
181
177
if(p == NULL){
182
178
return false;
183
179
}
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
190
if(replace){
191
char *new = realloc(*e, strlen(def) + 1);
192
if(new == NULL){
193
return false;
194
}
195
*e = new;
196
strcpy(*e, def);
197
}
198
return true;
199
}
200
}
201
180
return add_to_char_array(def, &(p->environ), &(p->envc));
202
181
}
203
182
183
204
184
/*
205
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
206
186
* Descriptor Flags".
207
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
208
188
*/
209
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
210
191
int ret = fcntl(fd, F_GETFD, 0);
211
192
/* If reading the flags failed, return error indication now. */
212
193
if(ret < 0){
216
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
217
198
}
218
199
200
process *process_list = NULL;
219
201
220
/* Mark processes as completed when they exit, and save their exit
202
/* Mark a process as completed when it exits, and save its exit
221
203
status. */
222
static void handle_sigchld(__attribute__((unused)) int sig){
223
while(true){
224
plugin *proc = plugin_list;
225
int status;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
227
if(pid == 0){
228
/* Only still running child processes */
229
break;
230
}
231
if(pid == -1){
232
if (errno != ECHILD){
233
perror("waitpid");
234
}
235
/* No child processes */
236
break;
237
}
238
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
241
proc = proc->next;
242
}
243
if(proc == NULL){
244
/* Process not found in process list */
245
continue;
246
}
247
proc->status = status;
248
proc->completed = true;
249
}
204
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;
250
221
}
251
222
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
254
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
255
228
for(size_t written = 0; written < length; written += (size_t)ret){
256
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
257
230
length - written));
262
235
return true;
263
236
}
264
237
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
267
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
269
free(*arg);
270
}
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
273
free(*env);
274
}
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
277
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
282
} else {
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
287
break;
288
}
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;
289
244
}
290
}
291
292
free(plugin_node);
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;
293
257
}
294
258
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
298
271
}
299
272
}
300
273
301
274
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
304
277
FILE *conffp;
305
278
size_t d_name_len;
306
279
DIR *dir = NULL;
338
311
{ .name = "global-options", .key = 'g',
339
312
.arg = "OPTION[,OPTION[,...]]",
340
313
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
342
315
.arg = "VAR=value",
343
316
.doc = "Environment variable passed to all plugins" },
344
317
{ .name = "options-for", .key = 'o',
345
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
319
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
348
321
.arg = "PLUGIN:ENV=value",
349
322
.doc = "Environment variable passed to specified plugin" },
350
323
{ .name = "disable", .key = 'd',
351
324
.arg = "PLUGIN",
352
325
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
354
.arg = "PLUGIN",
355
.doc = "Enable a specific plugin", .group = 1 },
356
326
{ .name = "plugin-dir", .key = 128,
357
327
.arg = "DIRECTORY",
358
328
.doc = "Specify a different plugin directory", .group = 2 },
359
{ .name = "config-file", .key = 129,
360
.arg = "FILE",
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
370
337
{ .name = NULL }
371
338
};
372
339
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
375
344
switch (key) {
376
case 'g': /* --global-options */
345
case 'g':
377
346
if (arg != NULL){
378
347
char *p;
379
348
while((p = strsep(&arg, ",")) != NULL){
380
349
if(p[0] == '\0'){
381
350
continue;
382
351
}
383
if(not add_argument(getplugin(NULL), p)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
384
353
perror("add_argument");
385
354
return ARGP_ERR_UNKNOWN;
386
355
}
387
356
}
388
357
}
389
358
break;
390
case 'G': /* --global-env */
359
case 'e':
391
360
if(arg == NULL){
392
361
break;
393
362
}
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
396
371
}
397
372
break;
398
case 'o': /* --options-for */
373
case 'o':
399
374
if (arg != NULL){
400
375
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
376
if(p_name[0] == '\0'){
402
377
break;
403
378
}
404
379
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
380
if(opt[0] == '\0'){
406
381
break;
407
382
}
408
char *p;
409
while((p = strsep(&opt, ",")) != NULL){
410
if(p[0] == '\0'){
411
continue;
412
}
413
if(not add_argument(getplugin(p_name), p)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
416
393
}
417
394
}
418
395
}
419
396
break;
420
case 'E': /* --env-for */
397
case 'f':
421
398
if(arg == NULL){
422
399
break;
423
400
}
426
403
if(envdef == NULL){
427
404
break;
428
405
}
429
*envdef = '\0';
430
if(not add_environment(getplugin(arg), envdef+1, true)){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
431
412
perror("add_environment");
432
413
}
433
414
}
434
415
break;
435
case 'd': /* --disable */
416
case 'd':
436
417
if (arg != NULL){
437
plugin *p = getplugin(arg);
418
plugin *p = getplugin(arg, plugins);
438
419
if(p == NULL){
439
420
return ARGP_ERR_UNKNOWN;
440
421
}
441
422
p->disabled = true;
442
423
}
443
424
break;
444
case 'e': /* --enable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = false;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
free(plugindir);
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
457
perror("strdup");
458
}
459
break;
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
462
break;
463
case 130: /* --userid */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
464
429
uid = (uid_t)strtol(arg, NULL, 10);
465
430
break;
466
case 131: /* --groupid */
431
case 130:
467
432
gid = (gid_t)strtol(arg, NULL, 10);
468
433
break;
469
case 132: /* --debug */
434
case 131:
470
435
debug = true;
471
436
break;
472
437
case ARGP_KEY_ARG:
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
476
if(arg[0] != '\0'){
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
478
}
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
501
break;
502
case 129: /* --config-file */
503
free(argfile);
504
argfile = strdup(arg);
505
if(argfile == NULL){
506
perror("strdup");
507
}
508
break;
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
512
case ARGP_KEY_ARG:
513
case ARGP_KEY_END:
514
break;
515
default:
516
return ARGP_ERR_UNKNOWN;
517
}
518
return 0;
519
}
520
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
523
.args_doc = "",
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
524
452
.doc = "Mandos plugin runner -- Run plugins" };
525
453
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
529
455
if (ret == ARGP_ERR_UNKNOWN){
530
456
fprintf(stderr, "Unknown error while parsing arguments\n");
531
457
exitstatus = EXIT_FAILURE;
532
458
goto fallback;
533
459
}
534
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
537
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
541
} else {
542
conffp = fopen(argfile, "r");
543
}
460
461
conffp = fopen(argfile, "r");
544
462
if(conffp != NULL){
545
463
char *org_line = NULL;
546
464
char *p, *arg, *new_arg, *line;
549
467
const char whitespace_delims[] = " \r\t\f\v\n";
550
468
const char comment_delim[] = "#";
551
469
552
custom_argc = 1;
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
555
perror("malloc");
556
exitstatus = EXIT_FAILURE;
557
goto fallback;
558
}
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
561
562
/* for each line in the config file, strip whitespace and ignore
563
commented text */
564
470
while(true){
565
471
sret = getline(&org_line, &size, conffp);
566
472
if(sret == -1){
574
480
continue;
575
481
}
576
482
new_arg = strdup(p);
577
if(new_arg == NULL){
578
perror("strdup");
579
exitstatus = EXIT_FAILURE;
580
free(org_line);
581
goto fallback;
582
}
583
584
custom_argc += 1;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
588
perror("realloc");
589
exitstatus = EXIT_FAILURE;
590
free(org_line);
591
goto fallback;
592
}
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
595
489
}
596
490
}
597
491
free(org_line);
598
} else {
492
} else{
599
493
/* Check for harmful errors and go to fallback. Other errors might
600
494
not affect opening plugins */
601
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
498
goto fallback;
605
499
}
606
500
}
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
501
609
502
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
611
0, NULL);
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
612
505
if (ret == ARGP_ERR_UNKNOWN){
613
506
fprintf(stderr, "Unknown error while parsing arguments\n");
614
507
exitstatus = EXIT_FAILURE;
616
509
}
617
510
}
618
511
619
/* Parse actual command line arguments, to let them override the
620
config file */
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
625
goto fallback;
626
}
627
628
512
if(debug){
629
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
639
523
}
640
524
}
641
525
642
/* Strip permissions down to nobody */
643
526
ret = setuid(uid);
644
527
if (ret == -1){
645
528
perror("setuid");
646
}
529
}
530
647
531
setgid(gid);
648
532
if (ret == -1){
649
533
perror("setgid");
650
534
}
651
535
652
if (plugindir == NULL){
653
dir = opendir(PDIR);
654
} else {
655
dir = opendir(plugindir);
656
}
657
536
dir = opendir(plugindir);
658
537
if(dir == NULL){
659
538
perror("Could not open plugin dir");
660
539
exitstatus = EXIT_FAILURE;
676
555
677
556
FD_ZERO(&rfds_all);
678
557
679
/* Read and execute any executable in the plugin directory*/
680
558
while(true){
681
559
dirst = readdir(dir);
682
560
683
/* All directory entries have been processed */
561
// All directory entries have been processed
684
562
if(dirst == NULL){
685
563
if (errno == EBADF){
686
564
perror("readdir");
692
570
693
571
d_name_len = strlen(dirst->d_name);
694
572
695
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
696
574
{
697
575
bool bad_name = false;
698
576
713
591
break;
714
592
}
715
593
}
594
716
595
if(bad_name){
717
596
continue;
718
597
}
598
719
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
600
size_t suf_len = strlen(*suf);
721
601
if((d_name_len >= suf_len)
736
616
}
737
617
738
618
char *filename;
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
741
} else {
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
743
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
744
620
if(ret < 0){
745
621
perror("asprintf");
746
622
continue;
752
628
free(filename);
753
629
continue;
754
630
}
755
756
/* Ignore non-executable files */
631
757
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
758
633
if(debug){
759
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
637
free(filename);
763
638
continue;
764
639
}
765
766
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
767
641
if(p == NULL){
768
642
perror("getplugin");
769
643
free(filename);
779
653
}
780
654
{
781
655
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
783
657
if(g != NULL){
784
658
for(char **a = g->argv + 1; *a != NULL; a++){
785
659
if(not add_argument(p, *a)){
788
662
}
789
663
/* Add global environment variables */
790
664
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
792
666
perror("add_environment");
793
667
}
794
668
}
799
673
process, too. */
800
674
if(p->environ[0] != NULL){
801
675
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
803
682
perror("add_environment");
804
683
}
805
684
}
812
691
exitstatus = EXIT_FAILURE;
813
692
goto fallback;
814
693
}
815
/* Ask OS to automatic close the pipe on exec */
816
694
ret = set_cloexec_flag(pipefd[0]);
817
695
if(ret < 0){
818
696
perror("set_cloexec_flag");
832
710
exitstatus = EXIT_FAILURE;
833
711
goto fallback;
834
712
}
835
/* Starting a new process to be watched */
713
// Starting a new process to be watched
836
714
pid_t pid = fork();
837
715
if(pid == -1){
838
716
perror("fork");
876
754
}
877
755
/* no return */
878
756
}
879
/* Parent process */
880
close(pipefd[1]); /* Close unused write end of pipe */
757
/* parent process */
881
758
free(filename);
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
884
perror("getplugin");
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
885
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
886
764
if(ret < 0){
887
perror("sigprocmask");
765
perror("sigprocmask");
888
766
}
889
767
exitstatus = EXIT_FAILURE;
890
768
goto fallback;
891
769
}
892
770
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
895
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
896
776
/* Unblock SIGCHLD so signal handler can be run if this process
897
777
has already completed */
898
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
782
goto fallback;
903
783
}
904
784
905
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
906
786
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
909
789
}
910
790
911
791
}
912
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
913
796
closedir(dir);
914
797
dir = NULL;
915
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
917
if(p->pid != 0){
918
break;
919
}
920
if(p->next == NULL){
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
922
" directory?\n");
923
free_plugin_list();
924
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
925
803
}
926
927
/* Main loop while running plugins exist */
928
while(plugin_list){
804
while(process_list){
929
805
fd_set rfds = rfds_all;
930
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
807
if (select_ret == -1){
935
811
}
936
812
/* OK, now either a process completed, or something can be read
937
813
from one of them */
938
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
939
815
/* Is this process completely done? */
940
816
if(proc->eof and proc->completed){
941
817
/* Only accept the plugin output if it exited cleanly */
942
818
if(not WIFEXITED(proc->status)
943
819
or WEXITSTATUS(proc->status) != 0){
944
820
/* Bad exit by plugin */
945
946
821
if(debug){
947
822
if(WIFEXITED(proc->status)){
948
823
fprintf(stderr, "Plugin %u exited with status %d\n",
957
832
(unsigned int) (proc->pid));
958
833
}
959
834
}
960
961
835
/* Remove the plugin */
962
836
FD_CLR(proc->fd, &rfds_all);
963
964
837
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
966
839
if(ret < 0){
967
840
perror("sigprocmask");
968
841
exitstatus = EXIT_FAILURE;
969
842
goto fallback;
970
843
}
971
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
}
972
857
/* We are done modifying process list, so unblock signal */
973
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
974
859
NULL);
975
860
if(ret < 0){
976
861
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
978
goto fallback;
979
}
980
981
if(plugin_list == NULL){
982
break;
983
}
984
985
plugin *next_plugin = proc->next;
986
free_plugin(proc);
987
proc = next_plugin;
988
continue;
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;
989
869
}
990
991
870
/* This process exited nicely, so print its buffer */
992
871
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
995
873
if(not bret){
996
874
perror("print_out_password");
997
875
exitstatus = EXIT_FAILURE;
998
876
}
999
877
goto fallback;
1000
878
}
1001
1002
879
/* This process has not completed. Does it have any output? */
1003
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
881
/* This process had nothing to say at this time */
1005
proc = proc->next;
1006
882
continue;
1007
883
}
1008
884
/* Before reading, make the process' data buffer large enough */
1021
897
BUFFER_SIZE);
1022
898
if(ret < 0){
1023
899
/* Read error from this process; ignore the error */
1024
proc = proc->next;
1025
900
continue;
1026
901
}
1027
902
if(ret == 0){
1036
911
1037
912
fallback:
1038
913
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1042
916
bool bret;
1043
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
918
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1049
len--;
1050
}
1051
bret = print_out_password(passwordbuffer, len);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
920
if(not bret){
1053
921
perror("print_out_password");
1054
922
exitstatus = EXIT_FAILURE;
1063
931
}
1064
932
1065
933
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1067
935
free(*arg);
1068
936
}
1069
937
free(custom_argv);
1070
938
}
939
free_plugin_list(plugin_list);
1071
940
1072
941
if(dir != NULL){
1073
942
closedir(dir);
1074
943
}
1075
944
1076
945
/* Free the process list and kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1078
if(p->pid != 0){
1079
close(p->fd);
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1083
perror("kill");
1084
}
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");
1085
953
}
954
free(process_list->buffer);
955
free(process_list);
1086
956
}
1087
957
1088
958
/* Wait for any remaining child processes to terminate */
1092
962
if(errno != ECHILD){
1093
963
perror("wait");
1094
964
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
965
1101
966
return exitstatus;
1102
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0