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- Committer: Björn Påhlsson
- Date: 2008-08-24 23:13:57 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- 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
- 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
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;
233
if(length>0 and buffer[length-1] == '\n'){
234
length--;
235
}
258
236
for(size_t written = 0; written < length; written += (size_t)ret){
259
237
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
238
length - written));
265
243
return true;
266
244
}
267
245
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
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;
292
252
}
293
}
294
295
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;
296
265
}
297
266
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
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);
301
279
}
302
280
}
303
281
304
282
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
283
const char *plugindir = "/lib/mandos/plugins.d";
284
const char *argfile = ARGFILE;
307
285
FILE *conffp;
308
286
size_t d_name_len;
309
287
DIR *dir = NULL;
341
319
{ .name = "global-options", .key = 'g',
342
320
.arg = "OPTION[,OPTION[,...]]",
343
321
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
322
{ .name = "global-envs", .key = 'e',
345
323
.arg = "VAR=value",
346
324
.doc = "Environment variable passed to all plugins" },
347
325
{ .name = "options-for", .key = 'o',
348
326
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
327
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
328
{ .name = "envs-for", .key = 'f',
351
329
.arg = "PLUGIN:ENV=value",
352
330
.doc = "Environment variable passed to specified plugin" },
353
331
{ .name = "disable", .key = 'd',
354
332
.arg = "PLUGIN",
355
333
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
334
{ .name = "plugin-dir", .key = 128,
360
335
.arg = "DIRECTORY",
361
336
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.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 },
373
345
{ .name = NULL }
374
346
};
375
347
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
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;
378
352
switch (key) {
379
case 'g': /* --global-options */
353
case 'g':
380
354
if (arg != NULL){
381
355
char *p;
382
356
while((p = strsep(&arg, ",")) != NULL){
383
357
if(p[0] == '\0'){
384
358
continue;
385
359
}
386
if(not add_argument(getplugin(NULL), p)){
360
if(not add_argument(getplugin(NULL, plugins), p)){
387
361
perror("add_argument");
388
362
return ARGP_ERR_UNKNOWN;
389
363
}
390
364
}
391
365
}
392
366
break;
393
case 'G': /* --global-env */
367
case 'e':
394
368
if(arg == NULL){
395
369
break;
396
370
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
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
}
399
379
}
400
380
break;
401
case 'o': /* --options-for */
381
case 'o':
402
382
if (arg != NULL){
403
383
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
384
if(p_name[0] == '\0'){
405
385
break;
406
386
}
407
387
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
388
if(opt[0] == '\0'){
409
389
break;
410
390
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
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
}
419
401
}
420
402
}
421
403
}
422
404
break;
423
case 'E': /* --env-for */
405
case 'f':
424
406
if(arg == NULL){
425
407
break;
426
408
}
429
411
if(envdef == NULL){
430
412
break;
431
413
}
432
*envdef = '\0';
433
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)){
434
420
perror("add_environment");
435
421
}
436
422
}
437
423
break;
438
case 'd': /* --disable */
424
case 'd':
439
425
if (arg != NULL){
440
plugin *p = getplugin(arg);
426
plugin *p = getplugin(arg, plugins);
441
427
if(p == NULL){
442
428
return ARGP_ERR_UNKNOWN;
443
429
}
444
430
p->disabled = true;
445
431
}
446
432
break;
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
case 130: /* --userid */
433
case 128:
434
plugindir = arg;
435
break;
436
case 129:
467
437
uid = (uid_t)strtol(arg, NULL, 10);
468
438
break;
469
case 131: /* --groupid */
439
case 130:
470
440
gid = (gid_t)strtol(arg, NULL, 10);
471
441
break;
472
case 132: /* --debug */
442
case 131:
473
443
debug = true;
474
444
break;
475
445
case ARGP_KEY_ARG:
476
/* Cryptsetup always passes an argument, which is an empty
477
string if "none" was specified in /etc/crypttab. So if
478
argument was empty, we ignore it silently. */
479
if(arg[0] != '\0'){
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
481
}
482
break;
483
case ARGP_KEY_END:
484
break;
485
default:
486
return ARGP_ERR_UNKNOWN;
487
}
488
return 0;
489
}
490
491
/* This option parser is the same as parse_opt() above, except it
492
ignores everything but the --config-file option. */
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
496
switch (key) {
497
case 'g': /* --global-options */
498
case 'G': /* --global-env */
499
case 'o': /* --options-for */
500
case 'E': /* --env-for */
501
case 'd': /* --disable */
502
case 'e': /* --enable */
503
case 128: /* --plugin-dir */
504
break;
505
case 129: /* --config-file */
506
free(argfile);
507
argfile = strdup(arg);
508
if(argfile == NULL){
509
perror("strdup");
510
}
511
break;
512
case 130: /* --userid */
513
case 131: /* --groupid */
514
case 132: /* --debug */
515
case ARGP_KEY_ARG:
516
case ARGP_KEY_END:
517
break;
518
default:
519
return ARGP_ERR_UNKNOWN;
520
}
521
return 0;
522
}
523
524
struct argp argp = { .options = options,
525
.parser = parse_opt_config_file,
526
.args_doc = "",
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
447
break;
448
case ARGP_KEY_END:
449
break;
450
default:
451
return ARGP_ERR_UNKNOWN;
452
}
453
return 0;
454
}
455
456
plugin *plugin_list = NULL;
457
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
460
.doc = "Mandos plugin runner -- Run plugins" };
528
461
529
/* Parse using the parse_opt_config_file in order to get the custom
530
config file location, if any. */
531
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
463
if (ret == ARGP_ERR_UNKNOWN){
533
464
fprintf(stderr, "Unknown error while parsing arguments\n");
534
465
exitstatus = EXIT_FAILURE;
535
466
goto fallback;
536
467
}
537
538
/* Reset to the normal argument parser */
539
argp.parser = parse_opt;
540
541
/* Open the configfile if available */
542
if (argfile == NULL){
543
conffp = fopen(AFILE, "r");
544
} else {
545
conffp = fopen(argfile, "r");
546
}
468
469
conffp = fopen(argfile, "r");
547
470
if(conffp != NULL){
548
471
char *org_line = NULL;
549
472
char *p, *arg, *new_arg, *line;
552
475
const char whitespace_delims[] = " \r\t\f\v\n";
553
476
const char comment_delim[] = "#";
554
477
555
custom_argc = 1;
556
custom_argv = malloc(sizeof(char*) * 2);
557
if(custom_argv == NULL){
558
perror("malloc");
559
exitstatus = EXIT_FAILURE;
560
goto fallback;
561
}
562
custom_argv[0] = argv[0];
563
custom_argv[1] = NULL;
564
565
/* for each line in the config file, strip whitespace and ignore
566
commented text */
567
478
while(true){
568
479
sret = getline(&org_line, &size, conffp);
569
480
if(sret == -1){
577
488
continue;
578
489
}
579
490
new_arg = strdup(p);
580
if(new_arg == NULL){
581
perror("strdup");
582
exitstatus = EXIT_FAILURE;
583
free(org_line);
584
goto fallback;
585
}
586
587
custom_argc += 1;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
591
perror("realloc");
592
exitstatus = EXIT_FAILURE;
593
free(org_line);
594
goto fallback;
595
}
596
custom_argv[custom_argc-1] = new_arg;
597
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
}
598
497
}
599
498
}
600
499
free(org_line);
601
} else {
500
} else{
602
501
/* Check for harmful errors and go to fallback. Other errors might
603
502
not affect opening plugins */
604
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
607
506
goto fallback;
608
507
}
609
508
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
509
612
510
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
615
513
if (ret == ARGP_ERR_UNKNOWN){
616
514
fprintf(stderr, "Unknown error while parsing arguments\n");
617
515
exitstatus = EXIT_FAILURE;
619
517
}
620
518
}
621
519
622
/* Parse actual command line arguments, to let them override the
623
config file */
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
629
}
630
631
520
if(debug){
632
521
for(plugin *p = plugin_list; p != NULL; p=p->next){
633
522
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
531
}
643
532
}
644
533
645
/* Strip permissions down to nobody */
646
534
ret = setuid(uid);
647
535
if (ret == -1){
648
536
perror("setuid");
649
}
537
}
538
650
539
setgid(gid);
651
540
if (ret == -1){
652
541
perror("setgid");
653
542
}
654
543
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
544
dir = opendir(plugindir);
661
545
if(dir == NULL){
662
546
perror("Could not open plugin dir");
663
547
exitstatus = EXIT_FAILURE;
679
563
680
564
FD_ZERO(&rfds_all);
681
565
682
/* Read and execute any executable in the plugin directory*/
683
566
while(true){
684
567
dirst = readdir(dir);
685
568
686
/* All directory entries have been processed */
569
// All directory entries have been processed
687
570
if(dirst == NULL){
688
571
if (errno == EBADF){
689
572
perror("readdir");
695
578
696
579
d_name_len = strlen(dirst->d_name);
697
580
698
/* Ignore dotfiles, backup files and other junk */
581
// Ignore dotfiles, backup files and other junk
699
582
{
700
583
bool bad_name = false;
701
584
716
599
break;
717
600
}
718
601
}
602
719
603
if(bad_name){
720
604
continue;
721
605
}
606
722
607
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
608
size_t suf_len = strlen(*suf);
724
609
if((d_name_len >= suf_len)
739
624
}
740
625
741
626
char *filename;
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
} else {
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
746
}
627
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
747
628
if(ret < 0){
748
629
perror("asprintf");
749
630
continue;
755
636
free(filename);
756
637
continue;
757
638
}
758
759
/* Ignore non-executable files */
639
760
640
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
641
if(debug){
762
642
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
645
free(filename);
766
646
continue;
767
647
}
768
769
plugin *p = getplugin(dirst->d_name);
648
plugin *p = getplugin(dirst->d_name, &plugin_list);
770
649
if(p == NULL){
771
650
perror("getplugin");
772
651
free(filename);
782
661
}
783
662
{
784
663
/* Add global arguments to argument list for this plugin */
785
plugin *g = getplugin(NULL);
664
plugin *g = getplugin(NULL, &plugin_list);
786
665
if(g != NULL){
787
666
for(char **a = g->argv + 1; *a != NULL; a++){
788
667
if(not add_argument(p, *a)){
791
670
}
792
671
/* Add global environment variables */
793
672
for(char **e = g->environ; *e != NULL; e++){
794
if(not add_environment(p, *e, false)){
673
if(not add_environment(p, *e)){
795
674
perror("add_environment");
796
675
}
797
676
}
802
681
process, too. */
803
682
if(p->environ[0] != NULL){
804
683
for(char **e = environ; *e != NULL; e++){
805
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)){
806
690
perror("add_environment");
807
691
}
808
692
}
815
699
exitstatus = EXIT_FAILURE;
816
700
goto fallback;
817
701
}
818
/* Ask OS to automatic close the pipe on exec */
819
702
ret = set_cloexec_flag(pipefd[0]);
820
703
if(ret < 0){
821
704
perror("set_cloexec_flag");
835
718
exitstatus = EXIT_FAILURE;
836
719
goto fallback;
837
720
}
838
/* Starting a new process to be watched */
721
// Starting a new process to be watched
839
722
pid_t pid = fork();
840
723
if(pid == -1){
841
724
perror("fork");
879
762
}
880
763
/* no return */
881
764
}
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
765
/* parent process */
884
766
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
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");
888
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
772
if(ret < 0){
890
perror("sigprocmask");
773
perror("sigprocmask");
891
774
}
892
775
exitstatus = EXIT_FAILURE;
893
776
goto fallback;
894
777
}
895
778
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
779
*new_process = (struct process){ .pid = pid,
780
.fd = pipefd[0],
781
.next = process_list };
782
// List handling
783
process_list = new_process;
899
784
/* Unblock SIGCHLD so signal handler can be run if this process
900
785
has already completed */
901
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
790
goto fallback;
906
791
}
907
792
908
FD_SET(new_plugin->fd, &rfds_all);
793
FD_SET(new_process->fd, &rfds_all);
909
794
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
912
797
}
913
798
914
799
}
915
800
801
free_plugin_list(plugin_list);
802
plugin_list = NULL;
803
916
804
closedir(dir);
917
805
dir = NULL;
918
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
920
if(p->pid != 0){
921
break;
922
}
923
if(p->next == NULL){
924
fprintf(stderr, "No plugin processes started. Incorrect plugin"
925
" directory?\n");
926
free_plugin_list();
927
}
806
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
809
" directory?\n");
810
process_list = NULL;
928
811
}
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
812
while(process_list){
932
813
fd_set rfds = rfds_all;
933
814
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
815
if (select_ret == -1){
938
819
}
939
820
/* OK, now either a process completed, or something can be read
940
821
from one of them */
941
for(plugin *proc = plugin_list; proc != NULL;){
822
for(process *proc = process_list; proc ; proc = proc->next){
942
823
/* Is this process completely done? */
943
824
if(proc->eof and proc->completed){
944
825
/* Only accept the plugin output if it exited cleanly */
945
826
if(not WIFEXITED(proc->status)
946
827
or WEXITSTATUS(proc->status) != 0){
947
828
/* Bad exit by plugin */
948
949
829
if(debug){
950
830
if(WIFEXITED(proc->status)){
951
831
fprintf(stderr, "Plugin %u exited with status %d\n",
960
840
(unsigned int) (proc->pid));
961
841
}
962
842
}
963
964
843
/* Remove the plugin */
965
844
FD_CLR(proc->fd, &rfds_all);
966
967
845
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
847
if(ret < 0){
970
848
perror("sigprocmask");
971
849
exitstatus = EXIT_FAILURE;
972
850
goto fallback;
973
851
}
974
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
}
975
865
/* We are done modifying process list, so unblock signal */
976
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
867
NULL);
978
868
if(ret < 0){
979
869
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
981
goto fallback;
982
}
983
984
if(plugin_list == NULL){
985
break;
986
}
987
988
plugin *next_plugin = proc->next;
989
free_plugin(proc);
990
proc = next_plugin;
991
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;
992
877
}
993
994
878
/* This process exited nicely, so print its buffer */
995
879
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
998
881
if(not bret){
999
882
perror("print_out_password");
1000
883
exitstatus = EXIT_FAILURE;
1001
884
}
1002
885
goto fallback;
1003
886
}
1004
1005
887
/* This process has not completed. Does it have any output? */
1006
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
889
/* This process had nothing to say at this time */
1008
proc = proc->next;
1009
890
continue;
1010
891
}
1011
892
/* Before reading, make the process' data buffer large enough */
1024
905
BUFFER_SIZE);
1025
906
if(ret < 0){
1026
907
/* Read error from this process; ignore the error */
1027
proc = proc->next;
1028
908
continue;
1029
909
}
1030
910
if(ret == 0){
1039
919
1040
920
fallback:
1041
921
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1045
924
bool bret;
1046
925
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1047
926
char *passwordbuffer = getpass("Password: ");
1048
size_t len = strlen(passwordbuffer);
1049
/* Strip trailing newline */
1050
if(len > 0 and passwordbuffer[len-1] == '\n'){
1051
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1052
len--;
1053
}
1054
bret = print_out_password(passwordbuffer, len);
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1055
928
if(not bret){
1056
929
perror("print_out_password");
1057
930
exitstatus = EXIT_FAILURE;
1066
939
}
1067
940
1068
941
if(custom_argv != NULL){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1070
943
free(*arg);
1071
944
}
1072
945
free(custom_argv);
1073
946
}
947
free_plugin_list(plugin_list);
1074
948
1075
949
if(dir != NULL){
1076
950
closedir(dir);
1077
951
}
1078
952
1079
953
/* Free the process list and kill the processes */
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
close(p->fd);
1083
ret = kill(p->pid, SIGTERM);
1084
if(ret == -1 and errno != ESRCH){
1085
/* Set-uid proccesses might not get closed */
1086
perror("kill");
1087
}
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");
1088
961
}
962
free(process_list->buffer);
963
free(process_list);
1089
964
}
1090
965
1091
966
/* Wait for any remaining child processes to terminate */
1095
970
if(errno != ECHILD){
1096
971
perror("wait");
1097
972
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
1103
973
1104
974
return exitstatus;
1105
975
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0