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- Committer: Björn Påhlsson
- Date: 2008-08-16 18:15:07 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816181507-hubb1rsmfq9b3agl
plugin-runner
Freeing up memory during run-time.
Freeing up memory during run-time.
- files added:
- network-protocol.txt
- 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
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
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
}
399
367
}
400
368
break;
401
case 'o': /* --options-for */
369
case 'o':
402
370
if (arg != NULL){
403
371
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
372
if(p_name[0] == '\0'){
405
373
break;
406
374
}
407
375
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
376
if(opt[0] == '\0'){
409
377
break;
410
378
}
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;
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
}
419
389
}
420
390
}
421
391
}
422
392
break;
423
case 'E': /* --env-for */
393
case 'f':
424
394
if(arg == NULL){
425
395
break;
426
396
}
429
399
if(envdef == NULL){
430
400
break;
431
401
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
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)){
434
408
perror("add_environment");
435
409
}
436
410
}
437
411
break;
438
case 'd': /* --disable */
412
case 'd':
439
413
if (arg != NULL){
440
plugin *p = getplugin(arg);
414
plugin *p = getplugin(arg, plugins);
441
415
if(p == NULL){
442
416
return ARGP_ERR_UNKNOWN;
443
417
}
444
418
p->disabled = true;
445
419
}
446
420
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 */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
467
425
uid = (uid_t)strtol(arg, NULL, 10);
468
426
break;
469
case 131: /* --groupid */
427
case 130:
470
428
gid = (gid_t)strtol(arg, NULL, 10);
471
429
break;
472
case 132: /* --debug */
430
case 131:
473
431
debug = true;
474
432
break;
475
433
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 = "",
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
527
448
.doc = "Mandos plugin runner -- Run plugins" };
528
449
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);
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
532
451
if (ret == ARGP_ERR_UNKNOWN){
533
452
fprintf(stderr, "Unknown error while parsing arguments\n");
534
453
exitstatus = EXIT_FAILURE;
535
454
goto fallback;
536
455
}
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
}
456
457
conffp = fopen(argfile, "r");
547
458
if(conffp != NULL){
548
459
char *org_line = NULL;
549
460
char *p, *arg, *new_arg, *line;
552
463
const char whitespace_delims[] = " \r\t\f\v\n";
553
464
const char comment_delim[] = "#";
554
465
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
466
while(true){
568
467
sret = getline(&org_line, &size, conffp);
569
468
if(sret == -1){
577
476
continue;
578
477
}
579
478
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;
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
}
598
485
}
599
486
}
600
487
free(org_line);
601
} else {
488
} else{
602
489
/* Check for harmful errors and go to fallback. Other errors might
603
490
not affect opening plugins */
604
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
607
494
goto fallback;
608
495
}
609
496
}
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
497
612
498
if(custom_argv != NULL){
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
614
0, NULL);
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
615
501
if (ret == ARGP_ERR_UNKNOWN){
616
502
fprintf(stderr, "Unknown error while parsing arguments\n");
617
503
exitstatus = EXIT_FAILURE;
619
505
}
620
506
}
621
507
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
508
if(debug){
632
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
633
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
642
519
}
643
520
}
644
521
645
/* Strip permissions down to nobody */
646
522
ret = setuid(uid);
647
523
if (ret == -1){
648
524
perror("setuid");
649
}
525
}
526
650
527
setgid(gid);
651
528
if (ret == -1){
652
529
perror("setgid");
653
530
}
654
531
655
if (plugindir == NULL){
656
dir = opendir(PDIR);
657
} else {
658
dir = opendir(plugindir);
659
}
660
532
dir = opendir(plugindir);
661
533
if(dir == NULL){
662
534
perror("Could not open plugin dir");
663
535
exitstatus = EXIT_FAILURE;
679
551
680
552
FD_ZERO(&rfds_all);
681
553
682
/* Read and execute any executable in the plugin directory*/
683
554
while(true){
684
555
dirst = readdir(dir);
685
556
686
/* All directory entries have been processed */
557
// All directory entries have been processed
687
558
if(dirst == NULL){
688
559
if (errno == EBADF){
689
560
perror("readdir");
695
566
696
567
d_name_len = strlen(dirst->d_name);
697
568
698
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
699
570
{
700
571
bool bad_name = false;
701
572
716
587
break;
717
588
}
718
589
}
590
719
591
if(bad_name){
720
592
continue;
721
593
}
594
722
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
596
size_t suf_len = strlen(*suf);
724
597
if((d_name_len >= suf_len)
739
612
}
740
613
741
614
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
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
747
616
if(ret < 0){
748
617
perror("asprintf");
749
618
continue;
755
624
free(filename);
756
625
continue;
757
626
}
758
759
/* Ignore non-executable files */
627
760
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
629
if(debug){
762
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
765
633
free(filename);
766
634
continue;
767
635
}
768
769
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
770
637
if(p == NULL){
771
638
perror("getplugin");
772
639
free(filename);
782
649
}
783
650
{
784
651
/* Add global arguments to argument list for this plugin */
785
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
786
653
if(g != NULL){
787
654
for(char **a = g->argv + 1; *a != NULL; a++){
788
655
if(not add_argument(p, *a)){
791
658
}
792
659
/* Add global environment variables */
793
660
for(char **e = g->environ; *e != NULL; e++){
794
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
795
662
perror("add_environment");
796
663
}
797
664
}
802
669
process, too. */
803
670
if(p->environ[0] != NULL){
804
671
for(char **e = environ; *e != NULL; e++){
805
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)){
806
678
perror("add_environment");
807
679
}
808
680
}
809
681
}
810
682
811
int pipefd[2];
683
int pipefd[2];
812
684
ret = pipe(pipefd);
813
685
if (ret == -1){
814
686
perror("pipe");
815
687
exitstatus = EXIT_FAILURE;
816
688
goto fallback;
817
689
}
818
/* Ask OS to automatic close the pipe on exec */
819
690
ret = set_cloexec_flag(pipefd[0]);
820
691
if(ret < 0){
821
692
perror("set_cloexec_flag");
835
706
exitstatus = EXIT_FAILURE;
836
707
goto fallback;
837
708
}
838
/* Starting a new process to be watched */
709
// Starting a new process to be watched
839
710
pid_t pid = fork();
840
711
if(pid == -1){
841
712
perror("fork");
879
750
}
880
751
/* no return */
881
752
}
882
/* Parent process */
883
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
884
754
free(filename);
885
plugin *new_plugin = getplugin(dirst->d_name);
886
if (new_plugin == NULL){
887
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");
888
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
760
if(ret < 0){
890
perror("sigprocmask");
761
perror("sigprocmask");
891
762
}
892
763
exitstatus = EXIT_FAILURE;
893
764
goto fallback;
894
765
}
895
766
896
new_plugin->pid = pid;
897
new_plugin->fd = pipefd[0];
898
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
899
772
/* Unblock SIGCHLD so signal handler can be run if this process
900
773
has already completed */
901
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
778
goto fallback;
906
779
}
907
780
908
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
909
782
910
if (maxfd < new_plugin->fd){
911
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
912
785
}
913
786
914
787
}
915
788
789
free_plugin_list(plugin_list);
790
916
791
closedir(dir);
917
792
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
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
928
798
}
929
930
/* Main loop while running plugins exist */
931
while(plugin_list){
799
while(process_list){
932
800
fd_set rfds = rfds_all;
933
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
934
802
if (select_ret == -1){
938
806
}
939
807
/* OK, now either a process completed, or something can be read
940
808
from one of them */
941
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
942
810
/* Is this process completely done? */
943
811
if(proc->eof and proc->completed){
944
812
/* Only accept the plugin output if it exited cleanly */
945
813
if(not WIFEXITED(proc->status)
946
814
or WEXITSTATUS(proc->status) != 0){
947
815
/* Bad exit by plugin */
948
949
816
if(debug){
950
817
if(WIFEXITED(proc->status)){
951
818
fprintf(stderr, "Plugin %u exited with status %d\n",
960
827
(unsigned int) (proc->pid));
961
828
}
962
829
}
963
964
830
/* Remove the plugin */
965
831
FD_CLR(proc->fd, &rfds_all);
966
967
832
/* Block signal while modifying process_list */
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
834
if(ret < 0){
970
835
perror("sigprocmask");
971
836
exitstatus = EXIT_FAILURE;
972
837
goto fallback;
973
838
}
974
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
}
975
852
/* We are done modifying process list, so unblock signal */
976
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
977
854
NULL);
978
855
if(ret < 0){
979
856
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;
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;
992
864
}
993
994
865
/* This process exited nicely, so print its buffer */
995
866
996
bool bret = print_out_password(proc->buffer,
997
proc->buffer_length);
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
998
868
if(not bret){
999
869
perror("print_out_password");
1000
870
exitstatus = EXIT_FAILURE;
1001
871
}
1002
872
goto fallback;
1003
873
}
1004
1005
874
/* This process has not completed. Does it have any output? */
1006
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1007
876
/* This process had nothing to say at this time */
1008
proc = proc->next;
1009
877
continue;
1010
878
}
1011
879
/* Before reading, make the process' data buffer large enough */
1024
892
BUFFER_SIZE);
1025
893
if(ret < 0){
1026
894
/* Read error from this process; ignore the error */
1027
proc = proc->next;
1028
895
continue;
1029
896
}
1030
897
if(ret == 0){
1039
906
1040
907
fallback:
1041
908
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1043
/* Fallback if all plugins failed, none are found or an error
1044
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1045
911
bool bret;
1046
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1047
913
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);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1055
915
if(not bret){
1056
916
perror("print_out_password");
1057
917
exitstatus = EXIT_FAILURE;
1066
926
}
1067
927
1068
928
if(custom_argv != NULL){
1069
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1070
930
free(*arg);
1071
931
}
1072
932
free(custom_argv);
1073
933
}
934
free_plugin_list(plugin_list);
1074
935
1075
936
if(dir != NULL){
1076
937
closedir(dir);
1077
938
}
1078
939
1079
940
/* 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
}
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");
1088
948
}
949
free(process_list->buffer);
950
free(process_list);
1089
951
}
1090
952
1091
953
/* Wait for any remaining child processes to terminate */
1095
957
if(errno != ECHILD){
1096
958
perror("wait");
1097
959
}
1098
1099
free_plugin_list();
1100
1101
free(plugindir);
1102
free(argfile);
1103
960
1104
961
return exitstatus;
1105
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0