To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugbasedclient.c
- browse files at revision 27
- compare with another revision
- download diff
- download tarball
- view history from revision 27
- Committer: Teddy Hogeborn
- Date: 2008-07-22 06:25:35 UTC
- mfrom: (24.1.2 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080722062535-whz5do0b3dzw6m08
Merge.
- files removed:
- server.conf
- files renamed:
- clients.conf => mandos-clients.conf
- files modified:
- Makefile
added
removed
plugbasedclient.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn and Björn Påhlsson.
6
6
*
7
7
* This program is free software: you can redistribute it and/or
8
8
* modify it under the terms of the GNU General Public License as
18
18
* along with this program. If not, see
19
19
* <http://www.gnu.org/licenses/>.
20
20
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
37
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
48
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
52
53
#define BUFFER_SIZE 256
25
#define _FORTIFY_SOURCE 2
26
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
37
FD_ISSET */
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
42
#include <argp.h> /* argp */
54
43
55
44
struct process;
56
45
60
49
char *buffer;
61
50
size_t buffer_size;
62
51
size_t buffer_length;
63
bool eof;
64
bool completed;
65
int status;
66
52
struct process *next;
67
53
} process;
68
54
69
55
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
56
char *name; /* can be "global" and any plugin name */
71
57
char **argv;
72
58
int argc;
73
bool disabled;
74
59
struct plugin *next;
75
60
} plugin;
76
61
77
static plugin *getplugin(char *name, plugin **plugin_list){
62
plugin *getplugin(char *name, plugin **plugin_list){
78
63
for (plugin *p = *plugin_list; p != NULL; p = p->next){
79
64
if ((p->name == name)
80
65
or (p->name and name and (strcmp(p->name, name) == 0))){
96
81
new_plugin->argv[0] = name;
97
82
new_plugin->argv[1] = NULL;
98
83
new_plugin->argc = 1;
99
new_plugin->disabled = false;
84
/* Append the new plugin to the list */
100
85
new_plugin->next = *plugin_list;
101
/* Append the new plugin to the list */
102
86
*plugin_list = new_plugin;
103
87
return new_plugin;
104
88
}
105
89
106
static void addargument(plugin *p, char *arg){
90
void addarguments(plugin *p, char *arg){
107
91
p->argv[p->argc] = arg;
108
92
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
93
if (p->argv == NULL){
113
97
p->argc++;
114
98
p->argv[p->argc] = NULL;
115
99
}
116
117
/*
118
* Based on the example in the GNU LibC manual chapter 13.13 "File
119
* Descriptor Flags".
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
121
*/
122
static int set_cloexec_flag(int fd)
123
{
124
int ret = fcntl(fd, F_GETFD, 0);
125
/* If reading the flags failed, return error indication now. */
126
if(ret < 0){
127
return ret;
128
}
129
/* Store modified flag word in the descriptor. */
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
}
132
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
139
status. */
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
153
}
100
101
#define BUFFER_SIZE 256
102
103
const char *argp_program_version =
104
"plugbasedclient 0.9";
105
const char *argp_program_bug_address =
106
"<mandos@fukt.bsnet.se>";
107
static char doc[] =
108
"Mandos plugin runner -- Run Mandos plugins";
109
/* A description of the arguments we accept. */
110
static char args_doc[] = "";
154
111
155
112
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
157
size_t d_name_len;
158
DIR *dir = NULL;
113
char plugindir[] = "plugins.d";
114
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
115
DIR *dir;
159
116
struct dirent *dirst;
160
117
struct stat st;
161
fd_set rfds_all;
118
fd_set rfds_orig;
162
119
int ret, maxfd = 0;
163
bool debug = false;
164
int exitstatus = EXIT_SUCCESS;
165
166
/* Establish a signal handler */
167
struct sigaction old_sigchld_action,
168
sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
170
sigemptyset(&sigchld_action.sa_mask);
171
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
172
if(ret < 0){
173
perror("sigaddset");
174
exit(EXIT_FAILURE);
175
}
176
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
177
if(ret < 0){
178
perror("sigaction");
179
exit(EXIT_FAILURE);
180
}
120
process *process_list = NULL;
181
121
182
122
/* The options we understand. */
183
123
struct argp_option options[] = {
184
124
{ .name = "global-options", .key = 'g',
185
.arg = "OPTION[,OPTION[,...]]",
186
.doc = "Options passed to all plugins" },
125
.arg = "option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting all plugins" },
187
127
{ .name = "options-for", .key = 'o',
188
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
189
.doc = "Options passed only to specified plugin" },
190
{ .name = "disable", .key = 'd',
191
.arg = "PLUGIN",
192
.doc = "Disable a specific plugin", .group = 1 },
193
{ .name = "plugin-dir", .key = 128,
194
.arg = "DIRECTORY",
195
.doc = "Specify a different plugin directory", .group = 2 },
196
{ .name = "debug", .key = 129,
197
.doc = "Debug mode", .group = 3 },
128
.arg = "plugin:option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting only specified plugins" },
198
130
{ .name = NULL }
199
131
};
200
132
201
133
error_t parse_opt (int key, char *arg, struct argp_state *state) {
202
/* Get the INPUT argument from `argp_parse', which we know is a
203
pointer to our plugin list pointer. */
134
/* Get the INPUT argument from `argp_parse', which we
135
know is a pointer to our arguments structure. */
204
136
plugin **plugins = state->input;
205
137
switch (key) {
206
138
case 'g':
207
139
if (arg != NULL){
208
140
char *p = strtok(arg, ",");
209
141
do{
210
addargument(getplugin(NULL, plugins), p);
142
addarguments(getplugin(NULL, plugins), p);
211
143
p = strtok(NULL, ",");
212
144
} while (p);
213
145
}
216
148
if (arg != NULL){
217
149
char *name = strtok(arg, ":");
218
150
char *p = strtok(NULL, ":");
219
if(p){
220
p = strtok(p, ",");
221
do{
222
addargument(getplugin(name, plugins), p);
223
p = strtok(NULL, ",");
224
} while (p);
225
}
226
}
227
break;
228
case 'd':
229
if (arg != NULL){
230
getplugin(arg, plugins)->disabled = true;
231
}
232
break;
233
case 128:
234
plugindir = arg;
235
break;
236
case 129:
237
debug = true;
151
p = strtok(p, ",");
152
do{
153
addarguments(getplugin(name, plugins), p);
154
p = strtok(NULL, ",");
155
} while (p);
156
}
238
157
break;
239
158
case ARGP_KEY_ARG:
240
159
argp_usage (state);
246
165
}
247
166
return 0;
248
167
}
249
168
250
169
plugin *plugin_list = NULL;
251
170
252
171
struct argp argp = { .options = options, .parser = parse_opt,
253
.args_doc = "",
254
.doc = "Mandos plugin runner -- Run plugins" };
255
172
.args_doc = args_doc, .doc = doc };
173
256
174
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
175
176
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
177
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
178
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
179
/* fprintf(stderr, "\tArg: %s\n", *a); */
180
/* } */
181
/* } */
257
182
258
if(debug){
259
for(plugin *p = plugin_list; p != NULL; p=p->next){
260
fprintf(stderr, "Plugin: %s has %d arguments\n",
261
p->name ? p->name : "Global", p->argc - 1);
262
for(char **a = p->argv; *a != NULL; a++){
263
fprintf(stderr, "\tArg: %s\n", *a);
264
}
265
}
266
}
183
/* return 0; */
267
184
268
185
dir = opendir(plugindir);
186
269
187
if(dir == NULL){
270
perror("Could not open plugin dir");
271
exitstatus = EXIT_FAILURE;
272
goto end;
273
}
274
275
/* Set the FD_CLOEXEC flag on the directory, if possible */
276
{
277
int dir_fd = dirfd(dir);
278
if(dir_fd >= 0){
279
ret = set_cloexec_flag(dir_fd);
280
if(ret < 0){
281
perror("set_cloexec_flag");
282
exitstatus = EXIT_FAILURE;
283
goto end;
284
}
285
}
286
}
287
288
FD_ZERO(&rfds_all);
188
fprintf(stderr, "Can not open directory\n");
189
return EXIT_FAILURE;
190
}
191
192
FD_ZERO(&rfds_orig);
289
193
290
194
while(true){
291
195
dirst = readdir(dir);
297
201
298
202
d_name_len = strlen(dirst->d_name);
299
203
300
// Ignore dotfiles, backup files and other junk
301
{
302
bool bad_name = false;
303
304
const char const *bad_prefixes[] = { ".", "#", NULL };
305
306
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
307
".dpkg-old",
308
".dpkg-divert", NULL };
309
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
310
size_t pre_len = strlen(*pre);
311
if((d_name_len >= pre_len)
312
and strncmp((dirst->d_name), *pre, pre_len) == 0){
313
if(debug){
314
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
" with bad prefix %s\n", dirst->d_name, *pre);
316
}
317
bad_name = true;
318
break;
319
}
320
}
321
322
if(bad_name){
323
continue;
324
}
325
326
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
327
size_t suf_len = strlen(*suf);
328
if((d_name_len >= suf_len)
329
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
330
== 0)){
331
if(debug){
332
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
333
" with bad suffix %s\n", dirst->d_name, *suf);
334
}
335
bad_name = true;
336
break;
337
}
338
}
339
340
if(bad_name){
341
continue;
342
}
343
}
344
345
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
346
if (filename == NULL){
347
perror("malloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
strcpy(filename, plugindir); /* Spurious warning */
352
strcat(filename, "/"); /* Spurious warning */
353
strcat(filename, dirst->d_name); /* Spurious warning */
354
204
// Ignore dotfiles and backup files
205
if (dirst->d_name[0] == '.'
206
or dirst->d_name[d_name_len - 1] == '~'){
207
continue;
208
}
209
210
char *filename = malloc(d_name_len + plugindir_len + 2);
211
strcpy(filename, plugindir);
212
strcat(filename, "/");
213
strcat(filename, dirst->d_name);
214
355
215
stat(filename, &st);
356
357
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
358
if(debug){
359
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
360
" with bad type or mode\n", filename);
361
}
362
free(filename);
363
continue;
364
}
365
if(getplugin(dirst->d_name, &plugin_list)->disabled){
366
if(debug){
367
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
368
dirst->d_name);
369
}
370
free(filename);
371
continue;
372
}
373
plugin *p = getplugin(dirst->d_name, &plugin_list);
374
{
375
/* Add global arguments to argument list for this plugin */
376
plugin *g = getplugin(NULL, &plugin_list);
377
for(char **a = g->argv + 1; *a != NULL; a++){
378
addargument(p, *a);
379
}
380
}
381
int pipefd[2];
382
ret = pipe(pipefd);
383
if (ret == -1){
384
perror("pipe");
385
exitstatus = EXIT_FAILURE;
386
goto end;
387
}
388
ret = set_cloexec_flag(pipefd[0]);
389
if(ret < 0){
390
perror("set_cloexec_flag");
391
exitstatus = EXIT_FAILURE;
392
goto end;
393
}
394
ret = set_cloexec_flag(pipefd[1]);
395
if(ret < 0){
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
398
goto end;
399
}
400
/* Block SIGCHLD until process is safely in process list */
401
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
402
if(ret < 0){
403
perror("sigprocmask");
404
exitstatus = EXIT_FAILURE;
405
goto end;
406
}
407
// Starting a new process to be watched
408
pid_t pid = fork();
409
if(pid == 0){
410
/* this is the child process */
411
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
412
if(ret < 0){
413
perror("sigaction");
414
_exit(EXIT_FAILURE);
415
}
416
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
417
if(ret < 0){
418
perror("sigprocmask");
419
_exit(EXIT_FAILURE);
420
}
421
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
422
423
if(dirfd(dir) < 0){
424
/* If dir has no file descriptor, we could not set FD_CLOEXEC
425
above and must now close it manually here. */
216
217
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
218
// Starting a new process to be watched
219
process *new_process = malloc(sizeof(process));
220
int pipefd[2];
221
ret = pipe(pipefd);
222
if (ret == -1){
223
perror(argv[0]);
224
goto end;
225
}
226
new_process->pid = fork();
227
if(new_process->pid == 0){
228
/* this is the child process */
426
229
closedir(dir);
427
}
428
if(execv(filename, p->argv) < 0){
429
perror("execv");
430
_exit(EXIT_FAILURE);
431
}
432
/* no return */
433
}
434
/* parent process */
435
free(filename);
436
close(pipefd[1]); /* close unused write end of pipe */
437
process *new_process = malloc(sizeof(process));
438
if (new_process == NULL){
439
perror("malloc");
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
441
if(ret < 0){
442
perror("sigprocmask");
443
}
444
exitstatus = EXIT_FAILURE;
445
goto end;
446
}
447
448
*new_process = (struct process){ .pid = pid,
449
.fd = pipefd[0],
450
.next = process_list };
451
// List handling
452
process_list = new_process;
453
/* Unblock SIGCHLD so signal handler can be run if this process
454
has already completed */
455
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
456
if(ret < 0){
457
perror("sigprocmask");
458
exitstatus = EXIT_FAILURE;
459
goto end;
460
}
461
462
FD_SET(new_process->fd, &rfds_all);
463
464
if (maxfd < new_process->fd){
465
maxfd = new_process->fd;
466
}
467
468
}
469
470
/* Free the plugin list */
471
for(plugin *next; plugin_list != NULL; plugin_list = next){
472
next = plugin_list->next;
473
free(plugin_list->argv);
474
free(plugin_list);
230
close(pipefd[0]); /* close unused read end of pipe */
231
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
232
char *basename;
233
basename = strrchr(filename, '/');
234
if (basename == NULL){
235
basename = filename;
236
} else {
237
basename++;
238
}
239
plugin *p = getplugin(basename, &plugin_list);
240
241
plugin *g = getplugin(NULL, &plugin_list);
242
for(char **a = g->argv + 1; *a != NULL; a++){
243
addarguments(p, *a);
244
}
245
if(execv(filename, p->argv) < 0){
246
perror(argv[0]);
247
close(pipefd[1]);
248
exit(EXIT_FAILURE);
249
}
250
/* no return */
251
}
252
close(pipefd[1]); /* close unused write end of pipe */
253
new_process->fd = pipefd[0];
254
new_process->buffer = malloc(BUFFER_SIZE);
255
if (new_process->buffer == NULL){
256
perror(argv[0]);
257
goto end;
258
}
259
new_process->buffer_size = BUFFER_SIZE;
260
new_process->buffer_length = 0;
261
FD_SET(new_process->fd, &rfds_orig);
262
263
if (maxfd < new_process->fd){
264
maxfd = new_process->fd;
265
}
266
267
//List handling
268
new_process->next = process_list;
269
process_list = new_process;
270
}
475
271
}
476
272
477
273
closedir(dir);
478
dir = NULL;
479
274
480
if (process_list == NULL){
481
fprintf(stderr, "No plugin processes started, exiting\n");
482
exitstatus = EXIT_FAILURE;
483
goto end;
484
}
485
while(process_list){
486
fd_set rfds = rfds_all;
487
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
488
if (select_ret == -1){
489
perror("select");
490
exitstatus = EXIT_FAILURE;
491
goto end;
492
}
493
/* OK, now either a process completed, or something can be read
494
from one of them */
495
for(process *proc = process_list; proc ; proc = proc->next){
496
/* Is this process completely done? */
497
if(proc->eof and proc->completed){
498
/* Only accept the plugin output if it exited cleanly */
499
if(not WIFEXITED(proc->status)
500
or WEXITSTATUS(proc->status) != 0){
501
/* Bad exit by plugin */
502
if(debug){
503
if(WIFEXITED(proc->status)){
504
fprintf(stderr, "Plugin %d exited with status %d\n",
505
proc->pid, WEXITSTATUS(proc->status));
506
} else if(WIFSIGNALED(proc->status)) {
507
fprintf(stderr, "Plugin %d killed by signal %d\n",
508
proc->pid, WTERMSIG(proc->status));
509
} else if(WCOREDUMP(proc->status)){
510
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
511
}
512
}
513
/* Remove the plugin */
514
FD_CLR(proc->fd, &rfds_all);
515
/* Block signal while modifying process_list */
516
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
517
if(ret < 0){
518
perror("sigprocmask");
519
exitstatus = EXIT_FAILURE;
520
goto end;
521
}
522
/* Delete this process entry from the list */
523
if(process_list == proc){
524
/* First one - simple */
525
process_list = proc->next;
526
} else {
527
/* Second one or later */
528
for(process *p = process_list; p != NULL; p = p->next){
529
if(p->next == proc){
530
p->next = proc->next;
531
break;
275
if (process_list != NULL){
276
while(true){
277
fd_set rfds = rfds_orig;
278
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
279
if (select_ret == -1){
280
perror(argv[0]);
281
goto end;
282
}else{
283
for(process *process_itr = process_list; process_itr != NULL;
284
process_itr = process_itr->next){
285
if(FD_ISSET(process_itr->fd, &rfds)){
286
if(process_itr->buffer_length + BUFFER_SIZE
287
> process_itr->buffer_size){
288
process_itr->buffer = realloc(process_itr->buffer,
289
process_itr->buffer_size
290
+ (size_t) BUFFER_SIZE);
291
if (process_itr->buffer == NULL){
292
perror(argv[0]);
293
goto end;
294
}
295
process_itr->buffer_size += BUFFER_SIZE;
296
}
297
ret = read(process_itr->fd, process_itr->buffer
298
+ process_itr->buffer_length, BUFFER_SIZE);
299
if(ret < 0){
300
/* Read error from this process; ignore it */
301
continue;
302
}
303
process_itr->buffer_length += (size_t) ret;
304
if(ret == 0){
305
/* got EOF */
306
/* wait for process exit */
307
int status;
308
waitpid(process_itr->pid, &status, 0);
309
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
310
for(size_t written = 0;
311
written < process_itr->buffer_length;){
312
ret = write(STDOUT_FILENO,
313
process_itr->buffer + written,
314
process_itr->buffer_length - written);
315
if(ret < 0){
316
perror(argv[0]);
317
goto end;
318
}
319
written += (size_t)ret;
320
}
321
goto end;
322
} else {
323
FD_CLR(process_itr->fd, &rfds_orig);
532
324
}
533
325
}
534
326
}
535
/* We are done modifying process list, so unblock signal */
536
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
537
NULL);
538
if(ret < 0){
539
perror("sigprocmask");
540
}
541
free(proc->buffer);
542
free(proc);
543
/* We deleted this process from the list, so we can't go
544
proc->next. Therefore, start over from the beginning of
545
the process list */
546
break;
547
}
548
/* This process exited nicely, so print its buffer */
549
for(size_t written = 0; written < proc->buffer_length;
550
written += (size_t)ret){
551
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
552
proc->buffer + written,
553
proc->buffer_length
554
- written));
555
if(ret < 0){
556
perror("write");
557
exitstatus = EXIT_FAILURE;
558
goto end;
559
}
560
}
561
goto end;
562
}
563
/* This process has not completed. Does it have any output? */
564
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
565
/* This process had nothing to say at this time */
566
continue;
567
}
568
/* Before reading, make the process' data buffer large enough */
569
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
570
proc->buffer = realloc(proc->buffer, proc->buffer_size
571
+ (size_t) BUFFER_SIZE);
572
if (proc->buffer == NULL){
573
perror("malloc");
574
exitstatus = EXIT_FAILURE;
575
goto end;
576
}
577
proc->buffer_size += BUFFER_SIZE;
578
}
579
/* Read from the process */
580
ret = read(proc->fd, proc->buffer + proc->buffer_length,
581
BUFFER_SIZE);
582
if(ret < 0){
583
/* Read error from this process; ignore the error */
584
continue;
585
}
586
if(ret == 0){
587
/* got EOF */
588
proc->eof = true;
589
} else {
590
proc->buffer_length += (size_t) ret;
327
}
591
328
}
592
329
}
593
330
}
594
if(process_list == NULL){
595
fprintf(stderr, "All plugin processes failed, exiting\n");
596
exitstatus = EXIT_FAILURE;
597
}
598
331
599
332
end:
600
/* Restore old signal handler */
601
sigaction(SIGCHLD, &old_sigchld_action, NULL);
602
603
/* Free the plugin list */
604
for(plugin *next; plugin_list != NULL; plugin_list = next){
605
next = plugin_list->next;
606
free(plugin_list->argv);
607
free(plugin_list);
608
}
609
610
if(dir != NULL){
611
closedir(dir);
612
}
613
614
/* Free the process list and kill the processes */
615
for(process *next; process_list != NULL; process_list = next){
616
next = process_list->next;
617
close(process_list->fd);
618
kill(process_list->pid, SIGTERM);
619
free(process_list->buffer);
620
free(process_list);
621
}
622
623
/* Wait for any remaining child processes to terminate */
624
do{
625
ret = wait(NULL);
626
} while(ret >= 0);
627
if(errno != ECHILD){
628
perror("wait");
629
}
630
631
return exitstatus;
333
for(process *process_itr = process_list; process_itr != NULL;
334
process_itr = process_itr->next){
335
close(process_itr->fd);
336
kill(process_itr->pid, SIGTERM);
337
free(process_itr->buffer);
338
}
339
340
while(true){
341
int status;
342
ret = wait(&status);
343
if (ret == -1){
344
if(errno != ECHILD){
345
perror("wait");
346
}
347
break;
348
}
349
}
350
return EXIT_SUCCESS;
632
351
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0