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- Committer: Teddy Hogeborn
- Date: 2008-09-01 16:53:17 UTC
- Revision ID: teddy@fukt.bsnet.se-20080901165317-77dccp81zyqimt2j
* plugin-runner.c (add_environment): Override existing environment
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
variables when asked to do so.
All callers changed.
(main): Removed old argp.args_doc string. Parse argument file
before normal command line arguments. Use ARGP_IN_ORDER
flag in both calls to argp_parse. Do not strdup() strings
to be sent to add_environment().
* plugin-runner.xml (OPTIONS): Document "--global-env" and "--envs-for".
(FILES): Note that the config file is parsed before the command line
options.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files modified:
- Makefile
added
removed
plugin-runner.c
56
56
#include <argp.h> /* struct argp_option, struct
57
57
argp_state, struct argp,
58
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
61
#include <signal.h> /* struct sigaction, sigemptyset(),
61
62
sigaddset(), sigaction(),
62
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
#include <errno.h> /* errno, EBADF */
65
66
66
67
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
71
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
75
struct plugin;
85
76
86
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
90
81
char **environ;
91
82
int envc;
92
83
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
93
94
struct plugin *next;
94
95
} plugin;
95
96
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets a existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
98
104
if ((p->name == name)
99
105
or (p->name and name and (strcmp(p->name, name) == 0))){
100
106
return p;
105
111
if (new_plugin == NULL){
106
112
return NULL;
107
113
}
108
*new_plugin = (plugin) { .name = name,
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
109
123
.argc = 1,
110
.envc = 0,
111
124
.disabled = false,
112
.next = *plugin_list };
125
.next = plugin_list };
113
126
114
127
new_plugin->argv = malloc(sizeof(char *) * 2);
115
128
if (new_plugin->argv == NULL){
129
free(copy_name);
116
130
free(new_plugin);
117
131
return NULL;
118
132
}
119
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
120
134
new_plugin->argv[1] = NULL;
121
135
122
136
new_plugin->environ = malloc(sizeof(char *));
123
137
if(new_plugin->environ == NULL){
138
free(copy_name);
124
139
free(new_plugin->argv);
125
140
free(new_plugin);
126
141
return NULL;
127
142
}
128
143
new_plugin->environ[0] = NULL;
144
129
145
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
131
147
return new_plugin;
132
148
}
133
149
163
179
}
164
180
165
181
/* Add to a plugin's environment */
166
static bool add_environment(plugin *p, const char *def){
182
static bool add_environment(plugin *p, const char *def, bool replace){
167
183
if(p == NULL){
168
184
return false;
169
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
170
203
return add_to_char_array(def, &(p->environ), &(p->envc));
171
204
}
172
205
173
174
206
/*
175
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
208
* Descriptor Flags".
187
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
188
220
}
189
221
190
process *process_list = NULL;
191
222
192
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
193
224
status. */
194
225
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
211
253
}
212
254
255
/* Prints out a password to stdout */
213
256
bool print_out_password(const char *buffer, size_t length){
214
257
ssize_t ret;
215
258
if(length>0 and buffer[length-1] == '\n'){
225
268
return true;
226
269
}
227
270
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
234
295
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
247
305
}
248
306
249
307
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
308
char *plugindir = NULL;
309
char *argfile = NULL;
252
310
FILE *conffp;
253
311
size_t d_name_len;
254
312
DIR *dir = NULL;
269
327
/* Establish a signal handler */
270
328
sigemptyset(&sigchld_action.sa_mask);
271
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
330
if(ret == -1){
273
331
perror("sigaddset");
274
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
275
334
}
276
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
336
if(ret == -1){
278
337
perror("sigaction");
279
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
280
340
}
281
341
282
342
/* The options we understand. */
284
344
{ .name = "global-options", .key = 'g',
285
345
.arg = "OPTION[,OPTION[,...]]",
286
346
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
347
{ .name = "global-env", .key = 'e',
288
348
.arg = "VAR=value",
289
349
.doc = "Environment variable passed to all plugins" },
290
350
{ .name = "options-for", .key = 'o',
291
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
352
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
353
{ .name = "env-for", .key = 'f',
294
354
.arg = "PLUGIN:ENV=value",
295
355
.doc = "Environment variable passed to specified plugin" },
296
356
{ .name = "disable", .key = 'd',
299
359
{ .name = "plugin-dir", .key = 128,
300
360
.arg = "DIRECTORY",
301
361
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
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 },
310
373
{ .name = NULL }
311
374
};
312
375
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
314
378
/* Get the INPUT argument from `argp_parse', which we know is a
315
379
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
380
switch (key) {
318
case 'g':
381
case 'g': /* --global-options */
319
382
if (arg != NULL){
320
383
char *p;
321
384
while((p = strsep(&arg, ",")) != NULL){
322
385
if(p[0] == '\0'){
323
386
continue;
324
387
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
326
389
perror("add_argument");
327
390
return ARGP_ERR_UNKNOWN;
328
391
}
329
392
}
330
393
}
331
394
break;
332
case 'e':
395
case 'e': /* --global-env */
333
396
if(arg == NULL){
334
397
break;
335
398
}
338
401
if(envdef == NULL){
339
402
break;
340
403
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
404
if(not add_environment(getplugin(NULL), envdef, true)){
342
405
perror("add_environment");
343
406
}
344
407
}
345
408
break;
346
case 'o':
409
case 'o': /* --options-for */
347
410
if (arg != NULL){
348
411
char *p_name = strsep(&arg, ":");
349
412
if(p_name[0] == '\0'){
359
422
if(p[0] == '\0'){
360
423
continue;
361
424
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
425
if(not add_argument(getplugin(p_name), p)){
363
426
perror("add_argument");
364
427
return ARGP_ERR_UNKNOWN;
365
428
}
367
430
}
368
431
}
369
432
break;
370
case 'f':
433
case 'f': /* --env-for */
371
434
if(arg == NULL){
372
435
break;
373
436
}
381
444
break;
382
445
}
383
446
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
447
if(not add_environment(getplugin(p_name), envdef, true)){
385
448
perror("add_environment");
386
449
}
387
450
}
388
451
break;
389
case 'd':
452
case 'd': /* --disable */
390
453
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
454
plugin *p = getplugin(arg);
392
455
if(p == NULL){
393
456
return ARGP_ERR_UNKNOWN;
394
457
}
395
458
p->disabled = true;
396
459
}
397
460
break;
398
case 128:
399
plugindir = arg;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
400
466
break;
401
case 129:
467
case 129: /* --config-file */
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
473
case 130: /* --userid */
402
474
uid = (uid_t)strtol(arg, NULL, 10);
403
475
break;
404
case 130:
476
case 131: /* --groupid */
405
477
gid = (gid_t)strtol(arg, NULL, 10);
406
478
break;
407
case 131:
479
case 132: /* --debug */
408
480
debug = true;
409
481
break;
410
482
case ARGP_KEY_ARG:
418
490
return 0;
419
491
}
420
492
421
plugin *plugin_list = NULL;
422
423
493
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
494
.args_doc = "",
425
495
.doc = "Mandos plugin runner -- Run plugins" };
426
496
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
429
fprintf(stderr, "Unknown error while parsing arguments\n");
430
exitstatus = EXIT_FAILURE;
431
goto end;
432
}
433
434
conffp = fopen(argfile, "r");
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
500
} else {
501
conffp = fopen(argfile, "r");
502
}
435
503
if(conffp != NULL){
436
504
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
437
506
size_t size = 0;
438
507
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
508
const char whitespace_delims[] = " \r\t\f\v\n";
441
509
const char comment_delim[] = "#";
442
510
511
custom_argc = 1;
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
520
521
/* for each line in the config file, strip whitespace and ignore
522
commented text */
443
523
while(true){
444
524
sret = getline(&org_line, &size, conffp);
445
525
if(sret == -1){
453
533
continue;
454
534
}
455
535
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
536
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
543
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
551
}
552
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
462
554
}
463
555
}
464
556
free(org_line);
465
} else{
557
} else {
466
558
/* Check for harmful errors and go to fallback. Other errors might
467
559
not affect opening plugins */
468
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
561
perror("fopen");
470
562
exitstatus = EXIT_FAILURE;
471
goto end;
563
goto fallback;
472
564
}
473
565
}
474
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
475
568
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
478
571
if (ret == ARGP_ERR_UNKNOWN){
479
572
fprintf(stderr, "Unknown error while parsing arguments\n");
480
573
exitstatus = EXIT_FAILURE;
481
goto end;
574
goto fallback;
482
575
}
483
576
}
484
577
578
/* Parse actual command line arguments, to let them override the
579
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
585
}
586
485
587
if(debug){
486
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
487
589
fprintf(stderr, "Plugin: %s has %d arguments\n",
496
598
}
497
599
}
498
600
601
/* Strip permissions down to nobody */
499
602
ret = setuid(uid);
500
603
if (ret == -1){
501
604
perror("setuid");
502
}
503
605
}
504
606
setgid(gid);
505
607
if (ret == -1){
506
608
perror("setgid");
507
609
}
508
610
509
dir = opendir(plugindir);
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
510
617
if(dir == NULL){
511
618
perror("Could not open plugin dir");
512
619
exitstatus = EXIT_FAILURE;
513
goto end;
620
goto fallback;
514
621
}
515
622
516
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
521
628
if(ret < 0){
522
629
perror("set_cloexec_flag");
523
630
exitstatus = EXIT_FAILURE;
524
goto end;
631
goto fallback;
525
632
}
526
633
}
527
634
}
528
635
529
636
FD_ZERO(&rfds_all);
530
637
638
/* Read and execute any executable in the plugin directory*/
531
639
while(true){
532
640
dirst = readdir(dir);
533
641
534
// All directory entries have been processed
642
/* All directory entries have been processed */
535
643
if(dirst == NULL){
536
644
if (errno == EBADF){
537
645
perror("readdir");
538
646
exitstatus = EXIT_FAILURE;
539
goto end;
647
goto fallback;
540
648
}
541
649
break;
542
650
}
543
651
544
652
d_name_len = strlen(dirst->d_name);
545
653
546
// Ignore dotfiles, backup files and other junk
654
/* Ignore dotfiles, backup files and other junk */
547
655
{
548
656
bool bad_name = false;
549
657
564
672
break;
565
673
}
566
674
}
567
568
675
if(bad_name){
569
676
continue;
570
677
}
571
572
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
679
size_t suf_len = strlen(*suf);
574
680
if((d_name_len >= suf_len)
601
707
free(filename);
602
708
continue;
603
709
}
604
710
711
/* Ignore non-executable files */
605
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
606
713
if(debug){
607
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
610
717
free(filename);
611
718
continue;
612
719
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
720
721
plugin *p = getplugin(dirst->d_name);
614
722
if(p == NULL){
615
723
perror("getplugin");
616
724
free(filename);
626
734
}
627
735
{
628
736
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
737
plugin *g = getplugin(NULL);
630
738
if(g != NULL){
631
739
for(char **a = g->argv + 1; *a != NULL; a++){
632
740
if(not add_argument(p, *a)){
635
743
}
636
744
/* Add global environment variables */
637
745
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
746
if(not add_environment(p, *e, false)){
639
747
perror("add_environment");
640
748
}
641
749
}
646
754
process, too. */
647
755
if(p->environ[0] != NULL){
648
756
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
757
if(not add_environment(p, *e, false)){
655
758
perror("add_environment");
656
759
}
657
760
}
658
761
}
659
762
660
int pipefd[2];
763
int pipefd[2];
661
764
ret = pipe(pipefd);
662
765
if (ret == -1){
663
766
perror("pipe");
664
767
exitstatus = EXIT_FAILURE;
665
goto end;
768
goto fallback;
666
769
}
770
/* Ask OS to automatic close the pipe on exec */
667
771
ret = set_cloexec_flag(pipefd[0]);
668
772
if(ret < 0){
669
773
perror("set_cloexec_flag");
670
774
exitstatus = EXIT_FAILURE;
671
goto end;
775
goto fallback;
672
776
}
673
777
ret = set_cloexec_flag(pipefd[1]);
674
778
if(ret < 0){
675
779
perror("set_cloexec_flag");
676
780
exitstatus = EXIT_FAILURE;
677
goto end;
781
goto fallback;
678
782
}
679
783
/* Block SIGCHLD until process is safely in process list */
680
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
681
785
if(ret < 0){
682
786
perror("sigprocmask");
683
787
exitstatus = EXIT_FAILURE;
684
goto end;
788
goto fallback;
685
789
}
686
// Starting a new process to be watched
790
/* Starting a new process to be watched */
687
791
pid_t pid = fork();
688
792
if(pid == -1){
689
793
perror("fork");
690
794
exitstatus = EXIT_FAILURE;
691
goto end;
795
goto fallback;
692
796
}
693
797
if(pid == 0){
694
798
/* this is the child process */
727
831
}
728
832
/* no return */
729
833
}
730
/* parent process */
834
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
731
836
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
perror("getplugin");
736
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
841
if(ret < 0){
738
perror("sigprocmask");
842
perror("sigprocmask");
739
843
}
740
844
exitstatus = EXIT_FAILURE;
741
goto end;
845
goto fallback;
742
846
}
743
847
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
850
749
851
/* Unblock SIGCHLD so signal handler can be run if this process
750
852
has already completed */
751
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
752
854
if(ret < 0){
753
855
perror("sigprocmask");
754
856
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
857
goto fallback;
858
}
859
860
FD_SET(new_plugin->fd, &rfds_all);
861
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
864
}
865
776
866
}
777
867
778
868
closedir(dir);
779
869
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
870
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
if(p->pid != 0){
873
break;
874
}
875
if(p->next == NULL){
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
877
" directory?\n");
878
free_plugin_list();
879
}
785
880
}
786
while(process_list){
881
882
/* Main loop while running plugins exist */
883
while(plugin_list){
787
884
fd_set rfds = rfds_all;
788
885
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
886
if (select_ret == -1){
790
887
perror("select");
791
888
exitstatus = EXIT_FAILURE;
792
goto end;
889
goto fallback;
793
890
}
794
891
/* OK, now either a process completed, or something can be read
795
892
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
797
894
/* Is this process completely done? */
798
895
if(proc->eof and proc->completed){
799
896
/* Only accept the plugin output if it exited cleanly */
800
897
if(not WIFEXITED(proc->status)
801
898
or WEXITSTATUS(proc->status) != 0){
802
899
/* Bad exit by plugin */
900
803
901
if(debug){
804
902
if(WIFEXITED(proc->status)){
805
903
fprintf(stderr, "Plugin %u exited with status %d\n",
814
912
(unsigned int) (proc->pid));
815
913
}
816
914
}
915
817
916
/* Remove the plugin */
818
917
FD_CLR(proc->fd, &rfds_all);
918
819
919
/* Block signal while modifying process_list */
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
821
921
if(ret < 0){
822
922
perror("sigprocmask");
823
923
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
924
goto fallback;
925
}
926
free_plugin(proc);
839
927
/* We are done modifying process list, so unblock signal */
840
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
929
NULL);
842
930
if(ret < 0){
843
931
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
932
exitstatus = EXIT_FAILURE;
933
goto fallback;
934
}
935
936
if(plugin_list == NULL){
937
break;
938
}
939
continue;
851
940
}
941
852
942
/* This process exited nicely, so print its buffer */
853
943
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
855
946
if(not bret){
856
947
perror("print_out_password");
857
948
exitstatus = EXIT_FAILURE;
858
949
}
859
goto end;
950
goto fallback;
860
951
}
952
861
953
/* This process has not completed. Does it have any output? */
862
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
955
/* This process had nothing to say at this time */
870
962
if (proc->buffer == NULL){
871
963
perror("malloc");
872
964
exitstatus = EXIT_FAILURE;
873
goto end;
965
goto fallback;
874
966
}
875
967
proc->buffer_size += BUFFER_SIZE;
876
968
}
891
983
}
892
984
893
985
894
end:
986
fallback:
895
987
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
990
occured */
898
991
bool bret;
899
992
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
993
char *passwordbuffer = getpass("Password: ");
902
995
if(not bret){
903
996
perror("print_out_password");
904
997
exitstatus = EXIT_FAILURE;
905
goto end;
906
998
}
907
999
}
908
1000
909
1001
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1006
}
1007
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
free(*arg);
922
1011
}
923
free(plugin_list->environ);
924
free(plugin_list);
1012
free(custom_argv);
925
1013
}
926
1014
927
1015
if(dir != NULL){
929
1017
}
930
1018
931
1019
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
if(p->pid != 0){
1022
close(p->fd);
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1027
}
939
1028
}
940
free(process_list->buffer);
941
free(process_list);
942
1029
}
943
1030
944
1031
/* Wait for any remaining child processes to terminate */
948
1035
if(errno != ECHILD){
949
1036
perror("wait");
950
1037
}
1038
1039
free_plugin_list();
1040
1041
free(plugindir);
1042
free(argfile);
951
1043
952
1044
return exitstatus;
953
1045
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0