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 24.1.7
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.7
- Committer: Björn Påhlsson
- Date: 2008-08-02 15:47:42 UTC
- mfrom: (36 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 38.
- Revision ID: belorn@braxen-20080802154742-pixsom1utki8x3yo
merge
- files modified:
- TODO
added
removed
plugbasedclient.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#include <stdio.h> /* popen, fileno */
25
#include <iso646.h> /* and, or, not */
26
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
27
WIFEXITED, WEXITSTATUS, wait */
28
#include <sys/wait.h> /* wait */
29
#include <dirent.h> /* DIR, opendir */
30
#include <sys/stat.h> /* stat, struct stat */
31
#include <unistd.h> /* stat, struct stat, chdir */
32
#include <stdlib.h> /* EXIT_FAILURE */
33
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
34
FD_ISSET */
35
#include <string.h> /* strlen, strcpy, strcat */
36
#include <stdbool.h> /* true */
37
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
38
#include <errno.h> /* errno */
39
#include <argp.h> /* argp */
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() */
40
52
41
53
struct process;
42
54
46
58
char *buffer;
47
59
size_t buffer_size;
48
60
size_t buffer_length;
61
bool eof;
62
bool completed;
63
int status;
49
64
struct process *next;
50
65
} process;
51
66
52
67
typedef struct plugin{
53
char *name; /* can be "global" and any plugin name */
68
char *name; /* can be NULL or any plugin name */
54
69
char **argv;
55
70
int argc;
71
bool disabled;
56
72
struct plugin *next;
57
73
} plugin;
58
74
78
94
new_plugin->argv[0] = name;
79
95
new_plugin->argv[1] = NULL;
80
96
new_plugin->argc = 1;
97
new_plugin->disabled = false;
98
new_plugin->next = *plugin_list;
81
99
/* Append the new plugin to the list */
82
new_plugin->next = *plugin_list;
83
100
*plugin_list = new_plugin;
84
101
return new_plugin;
85
102
}
86
103
87
void addarguments(plugin *p, char *arg){
104
void addargument(plugin *p, char *arg){
88
105
p->argv[p->argc] = arg;
89
106
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
90
107
if (p->argv == NULL){
94
111
p->argc++;
95
112
p->argv[p->argc] = NULL;
96
113
}
97
114
115
/*
116
* Based on the example in the GNU LibC manual chapter 13.13 "File
117
* Descriptor Flags".
118
* *Note File Descriptor Flags:(libc)Descriptor Flags.
119
*/
120
int set_cloexec_flag(int fd)
121
{
122
int ret = fcntl(fd, F_GETFD, 0);
123
/* If reading the flags failed, return error indication now. */
124
if(ret < 0){
125
return ret;
126
}
127
/* Store modified flag word in the descriptor. */
128
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
129
}
130
98
131
#define BUFFER_SIZE 256
99
132
100
const char *argp_program_version =
101
"plugbasedclient 0.9";
102
const char *argp_program_bug_address =
103
"<mandos@fukt.bsnet.se>";
104
static char doc[] =
105
"Mandos plugin runner -- Run Mandos plugins";
106
/* A description of the arguments we accept. */
107
static char args_doc[] = "";
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
}
108
154
109
155
int main(int argc, char *argv[]){
110
char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
112
DIR *dir;
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
157
size_t d_name_len;
158
DIR *dir = NULL;
113
159
struct dirent *dirst;
114
160
struct stat st;
115
fd_set rfds_orig;
161
fd_set rfds_all;
116
162
int ret, maxfd = 0;
117
process *process_list = NULL;
163
uid_t uid = 65534;
164
gid_t gid = 65534;
165
bool debug = false;
166
int exitstatus = EXIT_SUCCESS;
167
struct sigaction old_sigchld_action;
168
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
.sa_flags = SA_NOCLDSTOP };
170
171
/* Establish a signal handler */
172
sigemptyset(&sigchld_action.sa_mask);
173
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
174
if(ret < 0){
175
perror("sigaddset");
176
exit(EXIT_FAILURE);
177
}
178
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
179
if(ret < 0){
180
perror("sigaction");
181
exit(EXIT_FAILURE);
182
}
118
183
119
184
/* The options we understand. */
120
185
struct argp_option options[] = {
121
186
{ .name = "global-options", .key = 'g',
122
.arg = "option[,option[,...]]", .flags = 0,
123
.doc = "Options effecting all plugins" },
187
.arg = "OPTION[,OPTION[,...]]",
188
.doc = "Options passed to all plugins" },
124
189
{ .name = "options-for", .key = 'o',
125
.arg = "plugin:option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting only specified plugins" },
190
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
191
.doc = "Options passed only to specified plugin" },
192
{ .name = "disable", .key = 'd',
193
.arg = "PLUGIN",
194
.doc = "Disable a specific plugin", .group = 1 },
195
{ .name = "plugin-dir", .key = 128,
196
.arg = "DIRECTORY",
197
.doc = "Specify a different plugin directory", .group = 2 },
198
{ .name = "userid", .key = 129,
199
.arg = "ID", .flags = 0,
200
.doc = "User ID the plugins will run as", .group = 2 },
201
{ .name = "groupid", .key = 130,
202
.arg = "ID", .flags = 0,
203
.doc = "Group ID the plugins will run as", .group = 2 },
204
{ .name = "debug", .key = 131,
205
.doc = "Debug mode", .group = 3 },
127
206
{ .name = NULL }
128
207
};
129
208
130
209
error_t parse_opt (int key, char *arg, struct argp_state *state) {
131
/* Get the INPUT argument from `argp_parse', which we
132
know is a pointer to our arguments structure. */
210
/* Get the INPUT argument from `argp_parse', which we know is a
211
pointer to our plugin list pointer. */
133
212
plugin **plugins = state->input;
134
213
switch (key) {
135
214
case 'g':
136
215
if (arg != NULL){
137
216
char *p = strtok(arg, ",");
138
217
do{
139
addarguments(getplugin(NULL, plugins), p);
218
addargument(getplugin(NULL, plugins), p);
140
219
p = strtok(NULL, ",");
141
220
} while (p);
142
221
}
145
224
if (arg != NULL){
146
225
char *name = strtok(arg, ":");
147
226
char *p = strtok(NULL, ":");
148
p = strtok(p, ",");
149
do{
150
addarguments(getplugin(name, plugins), p);
151
p = strtok(NULL, ",");
152
} while (p);
153
}
227
if(p){
228
p = strtok(p, ",");
229
do{
230
addargument(getplugin(name, plugins), p);
231
p = strtok(NULL, ",");
232
} while (p);
233
}
234
}
235
break;
236
case 'd':
237
if (arg != NULL){
238
getplugin(arg, plugins)->disabled = true;
239
}
240
break;
241
case 128:
242
plugindir = arg;
243
break;
244
case 129:
245
uid = (uid_t)strtol(arg, NULL, 10);
246
break;
247
case 130:
248
gid = (gid_t)strtol(arg, NULL, 10);
249
break;
250
case 131:
251
debug = true;
154
252
break;
155
253
case ARGP_KEY_ARG:
156
254
argp_usage (state);
162
260
}
163
261
return 0;
164
262
}
165
263
166
264
plugin *plugin_list = NULL;
167
265
168
266
struct argp argp = { .options = options, .parser = parse_opt,
169
.args_doc = args_doc, .doc = doc };
170
171
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
172
173
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
174
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
175
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
176
/* fprintf(stderr, "\tArg: %s\n", *a); */
177
/* } */
178
/* } */
179
180
/* return 0; */
267
.args_doc = "",
268
.doc = "Mandos plugin runner -- Run plugins" };
269
270
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
271
272
if(debug){
273
for(plugin *p = plugin_list; p != NULL; p=p->next){
274
fprintf(stderr, "Plugin: %s has %d arguments\n",
275
p->name ? p->name : "Global", p->argc - 1);
276
for(char **a = p->argv; *a != NULL; a++){
277
fprintf(stderr, "\tArg: %s\n", *a);
278
}
279
}
280
}
281
282
ret = setuid(uid);
283
if (ret == -1){
284
perror("setuid");
285
}
286
287
setgid(gid);
288
if (ret == -1){
289
perror("setuid");
290
}
181
291
182
292
dir = opendir(plugindir);
183
184
293
if(dir == NULL){
185
fprintf(stderr, "Can not open directory\n");
186
return EXIT_FAILURE;
187
}
188
189
FD_ZERO(&rfds_orig);
294
perror("Could not open plugin dir");
295
exitstatus = EXIT_FAILURE;
296
goto end;
297
}
298
299
/* Set the FD_CLOEXEC flag on the directory, if possible */
300
{
301
int dir_fd = dirfd(dir);
302
if(dir_fd >= 0){
303
ret = set_cloexec_flag(dir_fd);
304
if(ret < 0){
305
perror("set_cloexec_flag");
306
exitstatus = EXIT_FAILURE;
307
goto end;
308
}
309
}
310
}
311
312
FD_ZERO(&rfds_all);
190
313
191
314
while(true){
192
315
dirst = readdir(dir);
198
321
199
322
d_name_len = strlen(dirst->d_name);
200
323
201
// Ignore dotfiles and backup files
202
if (dirst->d_name[0] == '.'
203
or dirst->d_name[d_name_len - 1] == '~'){
204
continue;
205
}
206
207
char *filename = malloc(d_name_len + plugindir_len + 2);
208
strcpy(filename, plugindir);
209
strcat(filename, "/");
210
strcat(filename, dirst->d_name);
211
324
// Ignore dotfiles, backup files and other junk
325
{
326
bool bad_name = false;
327
328
const char const *bad_prefixes[] = { ".", "#", NULL };
329
330
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
331
".dpkg-old",
332
".dpkg-divert", NULL };
333
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
334
size_t pre_len = strlen(*pre);
335
if((d_name_len >= pre_len)
336
and strncmp((dirst->d_name), *pre, pre_len) == 0){
337
if(debug){
338
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
339
" with bad prefix %s\n", dirst->d_name, *pre);
340
}
341
bad_name = true;
342
break;
343
}
344
}
345
346
if(bad_name){
347
continue;
348
}
349
350
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
351
size_t suf_len = strlen(*suf);
352
if((d_name_len >= suf_len)
353
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
354
== 0)){
355
if(debug){
356
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
357
" with bad suffix %s\n", dirst->d_name, *suf);
358
}
359
bad_name = true;
360
break;
361
}
362
}
363
364
if(bad_name){
365
continue;
366
}
367
}
368
369
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
370
if (filename == NULL){
371
perror("malloc");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
375
strcpy(filename, plugindir); /* Spurious warning */
376
strcat(filename, "/"); /* Spurious warning */
377
strcat(filename, dirst->d_name); /* Spurious warning */
378
212
379
stat(filename, &st);
213
214
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
215
// Starting a new process to be watched
216
process *new_process = malloc(sizeof(process));
217
int pipefd[2];
218
ret = pipe(pipefd);
219
if (ret == -1){
220
perror(argv[0]);
221
goto end;
222
}
223
new_process->pid = fork();
224
if(new_process->pid == 0){
225
/* this is the child process */
380
381
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
382
if(debug){
383
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
384
" with bad type or mode\n", filename);
385
}
386
free(filename);
387
continue;
388
}
389
if(getplugin(dirst->d_name, &plugin_list)->disabled){
390
if(debug){
391
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
392
dirst->d_name);
393
}
394
free(filename);
395
continue;
396
}
397
plugin *p = getplugin(dirst->d_name, &plugin_list);
398
{
399
/* Add global arguments to argument list for this plugin */
400
plugin *g = getplugin(NULL, &plugin_list);
401
for(char **a = g->argv + 1; *a != NULL; a++){
402
addargument(p, *a);
403
}
404
}
405
int pipefd[2];
406
ret = pipe(pipefd);
407
if (ret == -1){
408
perror("pipe");
409
exitstatus = EXIT_FAILURE;
410
goto end;
411
}
412
ret = set_cloexec_flag(pipefd[0]);
413
if(ret < 0){
414
perror("set_cloexec_flag");
415
exitstatus = EXIT_FAILURE;
416
goto end;
417
}
418
ret = set_cloexec_flag(pipefd[1]);
419
if(ret < 0){
420
perror("set_cloexec_flag");
421
exitstatus = EXIT_FAILURE;
422
goto end;
423
}
424
/* Block SIGCHLD until process is safely in process list */
425
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
426
if(ret < 0){
427
perror("sigprocmask");
428
exitstatus = EXIT_FAILURE;
429
goto end;
430
}
431
// Starting a new process to be watched
432
pid_t pid = fork();
433
if(pid == 0){
434
/* this is the child process */
435
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
436
if(ret < 0){
437
perror("sigaction");
438
_exit(EXIT_FAILURE);
439
}
440
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
441
if(ret < 0){
442
perror("sigprocmask");
443
_exit(EXIT_FAILURE);
444
}
445
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
446
447
if(dirfd(dir) < 0){
448
/* If dir has no file descriptor, we could not set FD_CLOEXEC
449
above and must now close it manually here. */
226
450
closedir(dir);
227
close(pipefd[0]); /* close unused read end of pipe */
228
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
229
char *basename;
230
basename = strrchr(filename, '/');
231
if (basename == NULL){
232
basename = filename;
233
} else {
234
basename++;
235
}
236
plugin *p = getplugin(basename, &plugin_list);
237
238
plugin *g = getplugin(NULL, &plugin_list);
239
for(char **a = g->argv + 1; *a != NULL; a++){
240
addarguments(p, *a);
241
}
242
if(execv(filename, p->argv) < 0){
243
perror(argv[0]);
244
close(pipefd[1]);
245
exit(EXIT_FAILURE);
246
}
247
/* no return */
248
}
249
close(pipefd[1]); /* close unused write end of pipe */
250
new_process->fd = pipefd[0];
251
new_process->buffer = malloc(BUFFER_SIZE);
252
if (new_process->buffer == NULL){
253
perror(argv[0]);
254
goto end;
255
}
256
new_process->buffer_size = BUFFER_SIZE;
257
new_process->buffer_length = 0;
258
FD_SET(new_process->fd, &rfds_orig);
259
260
if (maxfd < new_process->fd){
261
maxfd = new_process->fd;
262
}
263
264
//List handling
265
new_process->next = process_list;
266
process_list = new_process;
267
}
451
}
452
if(execv(filename, p->argv) < 0){
453
perror("execv");
454
_exit(EXIT_FAILURE);
455
}
456
/* no return */
457
}
458
/* parent process */
459
free(filename);
460
close(pipefd[1]); /* close unused write end of pipe */
461
process *new_process = malloc(sizeof(process));
462
if (new_process == NULL){
463
perror("malloc");
464
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
465
if(ret < 0){
466
perror("sigprocmask");
467
}
468
exitstatus = EXIT_FAILURE;
469
goto end;
470
}
471
472
*new_process = (struct process){ .pid = pid,
473
.fd = pipefd[0],
474
.next = process_list };
475
// List handling
476
process_list = new_process;
477
/* Unblock SIGCHLD so signal handler can be run if this process
478
has already completed */
479
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
if(ret < 0){
481
perror("sigprocmask");
482
exitstatus = EXIT_FAILURE;
483
goto end;
484
}
485
486
FD_SET(new_process->fd, &rfds_all);
487
488
if (maxfd < new_process->fd){
489
maxfd = new_process->fd;
490
}
491
492
}
493
494
/* Free the plugin list */
495
for(plugin *next; plugin_list != NULL; plugin_list = next){
496
next = plugin_list->next;
497
free(plugin_list->argv);
498
free(plugin_list);
268
499
}
269
500
270
501
closedir(dir);
502
dir = NULL;
271
503
272
if (process_list != NULL){
273
while(true){
274
fd_set rfds = rfds_orig;
275
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
276
if (select_ret == -1){
277
perror(argv[0]);
278
goto end;
279
}else{
280
for(process *process_itr = process_list; process_itr != NULL;
281
process_itr = process_itr->next){
282
if(FD_ISSET(process_itr->fd, &rfds)){
283
if(process_itr->buffer_length + BUFFER_SIZE
284
> process_itr->buffer_size){
285
process_itr->buffer = realloc(process_itr->buffer,
286
process_itr->buffer_size
287
+ (size_t) BUFFER_SIZE);
288
if (process_itr->buffer == NULL){
289
perror(argv[0]);
290
goto end;
291
}
292
process_itr->buffer_size += BUFFER_SIZE;
293
}
294
ret = read(process_itr->fd, process_itr->buffer
295
+ process_itr->buffer_length, BUFFER_SIZE);
296
if(ret < 0){
297
/* Read error from this process; ignore it */
298
continue;
299
}
300
process_itr->buffer_length += (size_t) ret;
301
if(ret == 0){
302
/* got EOF */
303
/* wait for process exit */
304
int status;
305
waitpid(process_itr->pid, &status, 0);
306
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
307
for(size_t written = 0;
308
written < process_itr->buffer_length;){
309
ret = write(STDOUT_FILENO,
310
process_itr->buffer + written,
311
process_itr->buffer_length - written);
312
if(ret < 0){
313
perror(argv[0]);
314
goto end;
315
}
316
written += (size_t)ret;
317
}
318
goto end;
319
} else {
320
FD_CLR(process_itr->fd, &rfds_orig);
504
if (process_list == NULL){
505
fprintf(stderr, "No plugin processes started, exiting\n");
506
exitstatus = EXIT_FAILURE;
507
goto end;
508
}
509
while(process_list){
510
fd_set rfds = rfds_all;
511
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
512
if (select_ret == -1){
513
perror("select");
514
exitstatus = EXIT_FAILURE;
515
goto end;
516
}
517
/* OK, now either a process completed, or something can be read
518
from one of them */
519
for(process *proc = process_list; proc ; proc = proc->next){
520
/* Is this process completely done? */
521
if(proc->eof and proc->completed){
522
/* Only accept the plugin output if it exited cleanly */
523
if(not WIFEXITED(proc->status)
524
or WEXITSTATUS(proc->status) != 0){
525
/* Bad exit by plugin */
526
if(debug){
527
if(WIFEXITED(proc->status)){
528
fprintf(stderr, "Plugin %d exited with status %d\n",
529
proc->pid, WEXITSTATUS(proc->status));
530
} else if(WIFSIGNALED(proc->status)) {
531
fprintf(stderr, "Plugin %d killed by signal %d\n",
532
proc->pid, WTERMSIG(proc->status));
533
} else if(WCOREDUMP(proc->status)){
534
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
535
}
536
}
537
/* Remove the plugin */
538
FD_CLR(proc->fd, &rfds_all);
539
/* Block signal while modifying process_list */
540
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
541
if(ret < 0){
542
perror("sigprocmask");
543
exitstatus = EXIT_FAILURE;
544
goto end;
545
}
546
/* Delete this process entry from the list */
547
if(process_list == proc){
548
/* First one - simple */
549
process_list = proc->next;
550
} else {
551
/* Second one or later */
552
for(process *p = process_list; p != NULL; p = p->next){
553
if(p->next == proc){
554
p->next = proc->next;
555
break;
321
556
}
322
557
}
323
558
}
324
}
559
/* We are done modifying process list, so unblock signal */
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
561
NULL);
562
if(ret < 0){
563
perror("sigprocmask");
564
}
565
free(proc->buffer);
566
free(proc);
567
/* We deleted this process from the list, so we can't go
568
proc->next. Therefore, start over from the beginning of
569
the process list */
570
break;
571
}
572
/* This process exited nicely, so print its buffer */
573
for(size_t written = 0; written < proc->buffer_length;
574
written += (size_t)ret){
575
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
576
proc->buffer + written,
577
proc->buffer_length
578
- written));
579
if(ret < 0){
580
perror("write");
581
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
}
585
goto end;
586
}
587
/* This process has not completed. Does it have any output? */
588
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
589
/* This process had nothing to say at this time */
590
continue;
591
}
592
/* Before reading, make the process' data buffer large enough */
593
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
594
proc->buffer = realloc(proc->buffer, proc->buffer_size
595
+ (size_t) BUFFER_SIZE);
596
if (proc->buffer == NULL){
597
perror("malloc");
598
exitstatus = EXIT_FAILURE;
599
goto end;
600
}
601
proc->buffer_size += BUFFER_SIZE;
602
}
603
/* Read from the process */
604
ret = read(proc->fd, proc->buffer + proc->buffer_length,
605
BUFFER_SIZE);
606
if(ret < 0){
607
/* Read error from this process; ignore the error */
608
continue;
609
}
610
if(ret == 0){
611
/* got EOF */
612
proc->eof = true;
613
} else {
614
proc->buffer_length += (size_t) ret;
325
615
}
326
616
}
327
617
}
618
if(process_list == NULL){
619
fprintf(stderr, "All plugin processes failed, exiting\n");
620
exitstatus = EXIT_FAILURE;
621
}
328
622
329
623
end:
330
for(process *process_itr = process_list; process_itr != NULL;
331
process_itr = process_itr->next){
332
close(process_itr->fd);
333
kill(process_itr->pid, SIGTERM);
334
free(process_itr->buffer);
335
}
336
337
while(true){
338
int status;
339
ret = wait(&status);
340
if (ret == -1){
341
if(errno != ECHILD){
342
perror("wait");
343
}
344
break;
345
}
346
}
347
return EXIT_SUCCESS;
624
/* Restore old signal handler */
625
sigaction(SIGCHLD, &old_sigchld_action, NULL);
626
627
/* Free the plugin list */
628
for(plugin *next; plugin_list != NULL; plugin_list = next){
629
next = plugin_list->next;
630
free(plugin_list->argv);
631
free(plugin_list);
632
}
633
634
if(dir != NULL){
635
closedir(dir);
636
}
637
638
/* Free the process list and kill the processes */
639
for(process *next; process_list != NULL; process_list = next){
640
next = process_list->next;
641
close(process_list->fd);
642
kill(process_list->pid, SIGTERM);
643
free(process_list->buffer);
644
free(process_list);
645
}
646
647
/* Wait for any remaining child processes to terminate */
648
do{
649
ret = wait(NULL);
650
} while(ret >= 0);
651
if(errno != ECHILD){
652
perror("wait");
653
}
654
655
return exitstatus;
348
656
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0