To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 95
- compare with another revision
- download diff
- download tarball
- view history from revision 95
- Committer: Teddy Hogeborn
- Date: 2008-08-23 07:17:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080823071728-wo1k2mtbje5910np
* Makefile (MANPOST): Bug fix: corrected patterns.
* mandos-options.xml: Bug fix: also change root node tag name in
DOCTYPE declaration.
(interface, address): Improved wording.
* overview.xml: Changed "host computer" to "computer".
* mandos-options.xml: Bug fix: also change root node tag name in
DOCTYPE declaration.
(interface, address): Improved wording.
* overview.xml: Changed "host computer" to "computer".
- files removed:
- .bzrignore
- 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;
111
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
120
111
}
121
112
122
113
*new_plugin = (plugin) { .name = copy_name,
123
114
.argc = 1,
115
.envc = 0,
124
116
.disabled = false,
125
.next = plugin_list };
117
.next = *plugin_list };
126
118
127
119
new_plugin->argv = malloc(sizeof(char *) * 2);
128
120
if (new_plugin->argv == NULL){
129
free(copy_name);
130
121
free(new_plugin);
131
122
return NULL;
132
123
}
133
124
new_plugin->argv[0] = copy_name;
134
125
new_plugin->argv[1] = NULL;
135
126
136
127
new_plugin->environ = malloc(sizeof(char *));
137
128
if(new_plugin->environ == NULL){
138
free(copy_name);
139
129
free(new_plugin->argv);
140
130
free(new_plugin);
141
131
return NULL;
142
132
}
143
133
new_plugin->environ[0] = NULL;
144
145
134
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
147
136
return new_plugin;
148
137
}
149
138
179
168
}
180
169
181
170
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
183
172
if(p == NULL){
184
173
return false;
185
174
}
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
175
return add_to_char_array(def, &(p->environ), &(p->envc));
204
176
}
205
177
178
206
179
/*
207
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
181
* Descriptor Flags".
219
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
193
}
221
194
195
process *process_list = NULL;
222
196
223
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
224
198
status. */
225
199
void handle_sigchld(__attribute__((unused)) int sig){
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
}
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;
253
216
}
254
217
255
/* Prints out a password to stdout */
256
218
bool print_out_password(const char *buffer, size_t length){
257
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
258
223
for(size_t written = 0; written < length; written += (size_t)ret){
259
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
225
length - written));
265
230
return true;
266
231
}
267
232
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
}
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;
292
239
}
293
}
294
295
free(plugin_node);
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
252
}
297
253
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
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
}
302
268
}
303
269
304
270
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
307
273
FILE *conffp;
308
274
size_t d_name_len;
309
275
DIR *dir = NULL;
332
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
299
if(ret == -1){
334
300
perror("sigaction");
335
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
336
302
goto fallback;
337
303
}
338
304
341
307
{ .name = "global-options", .key = 'g',
342
308
.arg = "OPTION[,OPTION[,...]]",
343
309
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
345
311
.arg = "VAR=value",
346
312
.doc = "Environment variable passed to all plugins" },
347
313
{ .name = "options-for", .key = 'o',
348
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
315
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
351
317
.arg = "PLUGIN:ENV=value",
352
318
.doc = "Environment variable passed to specified plugin" },
353
319
{ .name = "disable", .key = 'd',
354
320
.arg = "PLUGIN",
355
321
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
359
322
{ .name = "plugin-dir", .key = 128,
360
323
.arg = "DIRECTORY",
361
324
.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 },
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 },
373
333
{ .name = NULL }
374
334
};
375
335
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
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;
378
340
switch (key) {
379
case 'g': /* --global-options */
341
case 'g':
380
342
if (arg != NULL){
381
343
char *p;
382
344
while((p = strsep(&arg, ",")) != NULL){
383
345
if(p[0] == '\0'){
384
346
continue;
385
347
}
386
if(not add_argument(getplugin(NULL), p)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
387
349
perror("add_argument");
388
350
return ARGP_ERR_UNKNOWN;
389
351
}
390
352
}
391
353
}
392
354
break;
393
case 'G': /* --global-env */
355
case 'e':
394
356
if(arg == NULL){
395
357
break;
396
358
}
399
361
if(envdef == NULL){
400
362
break;
401
363
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
403
365
perror("add_environment");
404
366
}
405
367
}
406
368
break;
407
case 'o': /* --options-for */
369
case 'o':
408
370
if (arg != NULL){
409
371
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
411
373
break;
412
374
}
413
375
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
415
377
break;
416
378
}
417
char *p;
418
while((p = strsep(&opt, ",")) != NULL){
419
if(p[0] == '\0'){
420
continue;
421
}
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
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
}
425
389
}
426
390
}
427
391
}
428
392
break;
429
case 'E': /* --env-for */
393
case 'f':
430
394
if(arg == NULL){
431
395
break;
432
396
}
440
404
break;
441
405
}
442
406
envdef++;
443
if(not add_environment(getplugin(p_name), envdef, true)){
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
444
408
perror("add_environment");
445
409
}
446
410
}
447
411
break;
448
case 'd': /* --disable */
412
case 'd':
449
413
if (arg != NULL){
450
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
451
415
if(p == NULL){
452
416
return ARGP_ERR_UNKNOWN;
453
417
}
454
418
p->disabled = true;
455
419
}
456
420
break;
457
case 'e': /* --enable */
458
if (arg != NULL){
459
plugin *p = getplugin(arg);
460
if(p == NULL){
461
return ARGP_ERR_UNKNOWN;
462
}
463
p->disabled = false;
464
}
465
break;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
469
perror("strdup");
470
}
471
break;
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
474
break;
475
case 130: /* --userid */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
476
425
uid = (uid_t)strtol(arg, NULL, 10);
477
426
break;
478
case 131: /* --groupid */
427
case 130:
479
428
gid = (gid_t)strtol(arg, NULL, 10);
480
429
break;
481
case 132: /* --debug */
430
case 131:
482
431
debug = true;
483
432
break;
484
433
case ARGP_KEY_ARG:
492
441
return 0;
493
442
}
494
443
495
/* This option parser is the same as parse_opt() above, except it
496
ignores everything but the --config-file option. */
497
error_t parse_opt_config_file (int key, char *arg,
498
__attribute__((unused))
499
struct argp_state *state) {
500
switch (key) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
508
break;
509
case 129: /* --config-file */
510
argfile = strdup(arg);
511
if(argfile == NULL){
512
perror("strdup");
513
}
514
break;
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
518
case ARGP_KEY_ARG:
519
case ARGP_KEY_END:
520
break;
521
default:
522
return ARGP_ERR_UNKNOWN;
523
}
524
return 0;
525
}
444
plugin *plugin_list = NULL;
526
445
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
529
.args_doc = "",
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
448
.doc = "Mandos plugin runner -- Run plugins" };
531
449
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
535
451
if (ret == ARGP_ERR_UNKNOWN){
536
452
fprintf(stderr, "Unknown error while parsing arguments\n");
537
453
exitstatus = EXIT_FAILURE;
538
454
goto fallback;
539
455
}
540
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
543
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
547
} else {
548
conffp = fopen(argfile, "r");
549
}
456
457
conffp = fopen(argfile, "r");
550
458
if(conffp != NULL){
551
459
char *org_line = NULL;
552
460
char *p, *arg, *new_arg, *line;
555
463
const char whitespace_delims[] = " \r\t\f\v\n";
556
464
const char comment_delim[] = "#";
557
465
558
custom_argc = 1;
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
561
perror("malloc");
562
exitstatus = EXIT_FAILURE;
563
goto fallback;
564
}
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
567
568
/* for each line in the config file, strip whitespace and ignore
569
commented text */
570
466
while(true){
571
467
sret = getline(&org_line, &size, conffp);
572
468
if(sret == -1){
580
476
continue;
581
477
}
582
478
new_arg = strdup(p);
583
if(new_arg == NULL){
584
perror("strdup");
585
exitstatus = EXIT_FAILURE;
586
free(org_line);
587
goto fallback;
588
}
589
590
custom_argc += 1;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
594
perror("realloc");
595
exitstatus = EXIT_FAILURE;
596
free(org_line);
597
goto fallback;
598
}
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
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
}
601
485
}
602
486
}
603
487
free(org_line);
604
} else {
488
} else{
605
489
/* Check for harmful errors and go to fallback. Other errors might
606
490
not affect opening plugins */
607
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
610
494
goto fallback;
611
495
}
612
496
}
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
497
615
498
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
617
0, NULL);
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
618
501
if (ret == ARGP_ERR_UNKNOWN){
619
502
fprintf(stderr, "Unknown error while parsing arguments\n");
620
503
exitstatus = EXIT_FAILURE;
622
505
}
623
506
}
624
507
625
/* Parse actual command line arguments, to let them override the
626
config file */
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
631
goto fallback;
632
}
633
634
508
if(debug){
635
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
636
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
645
519
}
646
520
}
647
521
648
/* Strip permissions down to nobody */
649
522
ret = setuid(uid);
650
523
if (ret == -1){
651
524
perror("setuid");
652
}
525
}
526
653
527
setgid(gid);
654
528
if (ret == -1){
655
529
perror("setgid");
656
530
}
657
531
658
if (plugindir == NULL){
659
dir = opendir(PDIR);
660
} else {
661
dir = opendir(plugindir);
662
}
663
532
dir = opendir(plugindir);
664
533
if(dir == NULL){
665
534
perror("Could not open plugin dir");
666
535
exitstatus = EXIT_FAILURE;
682
551
683
552
FD_ZERO(&rfds_all);
684
553
685
/* Read and execute any executable in the plugin directory*/
686
554
while(true){
687
555
dirst = readdir(dir);
688
556
689
/* All directory entries have been processed */
557
// All directory entries have been processed
690
558
if(dirst == NULL){
691
559
if (errno == EBADF){
692
560
perror("readdir");
698
566
699
567
d_name_len = strlen(dirst->d_name);
700
568
701
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
702
570
{
703
571
bool bad_name = false;
704
572
719
587
break;
720
588
}
721
589
}
590
722
591
if(bad_name){
723
592
continue;
724
593
}
594
725
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
596
size_t suf_len = strlen(*suf);
727
597
if((d_name_len >= suf_len)
742
612
}
743
613
744
614
char *filename;
745
if(plugindir == NULL){
746
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
747
} else {
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
750
616
if(ret < 0){
751
617
perror("asprintf");
752
618
continue;
758
624
free(filename);
759
625
continue;
760
626
}
761
762
/* Ignore non-executable files */
627
763
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
764
629
if(debug){
765
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
768
633
free(filename);
769
634
continue;
770
635
}
771
772
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
773
637
if(p == NULL){
774
638
perror("getplugin");
775
639
free(filename);
785
649
}
786
650
{
787
651
/* Add global arguments to argument list for this plugin */
788
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
789
653
if(g != NULL){
790
654
for(char **a = g->argv + 1; *a != NULL; a++){
791
655
if(not add_argument(p, *a)){
794
658
}
795
659
/* Add global environment variables */
796
660
for(char **e = g->environ; *e != NULL; e++){
797
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
798
662
perror("add_environment");
799
663
}
800
664
}
805
669
process, too. */
806
670
if(p->environ[0] != NULL){
807
671
for(char **e = environ; *e != NULL; e++){
808
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
809
678
perror("add_environment");
810
679
}
811
680
}
812
681
}
813
682
814
int pipefd[2];
683
int pipefd[2];
815
684
ret = pipe(pipefd);
816
685
if (ret == -1){
817
686
perror("pipe");
818
687
exitstatus = EXIT_FAILURE;
819
688
goto fallback;
820
689
}
821
/* Ask OS to automatic close the pipe on exec */
822
690
ret = set_cloexec_flag(pipefd[0]);
823
691
if(ret < 0){
824
692
perror("set_cloexec_flag");
838
706
exitstatus = EXIT_FAILURE;
839
707
goto fallback;
840
708
}
841
/* Starting a new process to be watched */
709
// Starting a new process to be watched
842
710
pid_t pid = fork();
843
711
if(pid == -1){
844
712
perror("fork");
882
750
}
883
751
/* no return */
884
752
}
885
/* Parent process */
886
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
887
754
free(filename);
888
plugin *new_plugin = getplugin(dirst->d_name);
889
if (new_plugin == NULL){
890
perror("getplugin");
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");
891
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
892
760
if(ret < 0){
893
perror("sigprocmask");
761
perror("sigprocmask");
894
762
}
895
763
exitstatus = EXIT_FAILURE;
896
764
goto fallback;
897
765
}
898
766
899
new_plugin->pid = pid;
900
new_plugin->fd = pipefd[0];
901
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
902
772
/* Unblock SIGCHLD so signal handler can be run if this process
903
773
has already completed */
904
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
778
goto fallback;
909
779
}
910
780
911
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
912
782
913
if (maxfd < new_plugin->fd){
914
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
915
785
}
916
786
917
787
}
918
788
789
free_plugin_list(plugin_list);
790
919
791
closedir(dir);
920
792
dir = NULL;
921
922
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
if(p->pid != 0){
924
break;
925
}
926
if(p->next == NULL){
927
fprintf(stderr, "No plugin processes started. Incorrect plugin"
928
" directory?\n");
929
free_plugin_list();
930
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
931
798
}
932
933
/* Main loop while running plugins exist */
934
while(plugin_list){
799
while(process_list){
935
800
fd_set rfds = rfds_all;
936
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
937
802
if (select_ret == -1){
941
806
}
942
807
/* OK, now either a process completed, or something can be read
943
808
from one of them */
944
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
809
for(process *proc = process_list; proc ; proc = proc->next){
945
810
/* Is this process completely done? */
946
811
if(proc->eof and proc->completed){
947
812
/* Only accept the plugin output if it exited cleanly */
948
813
if(not WIFEXITED(proc->status)
949
814
or WEXITSTATUS(proc->status) != 0){
950
815
/* Bad exit by plugin */
951
952
816
if(debug){
953
817
if(WIFEXITED(proc->status)){
954
818
fprintf(stderr, "Plugin %u exited with status %d\n",
963
827
(unsigned int) (proc->pid));
964
828
}
965
829
}
966
967
830
/* Remove the plugin */
968
831
FD_CLR(proc->fd, &rfds_all);
969
970
832
/* Block signal while modifying process_list */
971
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
972
834
if(ret < 0){
973
835
perror("sigprocmask");
974
836
exitstatus = EXIT_FAILURE;
975
837
goto fallback;
976
838
}
977
free_plugin(proc);
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
}
978
852
/* We are done modifying process list, so unblock signal */
979
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
980
854
NULL);
981
855
if(ret < 0){
982
856
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
984
goto fallback;
985
}
986
987
if(plugin_list == NULL){
988
break;
989
}
990
continue;
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;
991
864
}
992
993
865
/* This process exited nicely, so print its buffer */
994
866
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
997
868
if(not bret){
998
869
perror("print_out_password");
999
870
exitstatus = EXIT_FAILURE;
1000
871
}
1001
872
goto fallback;
1002
873
}
1003
1004
874
/* This process has not completed. Does it have any output? */
1005
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
876
/* This process had nothing to say at this time */
1036
906
1037
907
fallback:
1038
908
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1041
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1042
911
bool bret;
1043
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
913
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);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1052
915
if(not bret){
1053
916
perror("print_out_password");
1054
917
exitstatus = EXIT_FAILURE;
1063
926
}
1064
927
1065
928
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1067
930
free(*arg);
1068
931
}
1069
932
free(custom_argv);
1070
933
}
934
free_plugin_list(plugin_list);
1071
935
1072
936
if(dir != NULL){
1073
937
closedir(dir);
1074
938
}
1075
939
1076
940
/* 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
}
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");
1085
948
}
949
free(process_list->buffer);
950
free(process_list);
1086
951
}
1087
952
1088
953
/* Wait for any remaining child processes to terminate */
1092
957
if(errno != ECHILD){
1093
958
perror("wait");
1094
959
}
1095
1096
free_plugin_list();
1097
1098
free(plugindir);
1099
free(argfile);
1100
960
1101
961
return exitstatus;
1102
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0