122
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
126
#define BUFFER_SIZE 256
128
const char *argp_program_version =
129
"plugbasedclient 0.9";
130
const char *argp_program_bug_address =
131
"<mandos@fukt.bsnet.se>";
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
136
process *process_list = NULL;
138
/* Mark a process as completed when it exits, and save its exit
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
148
/* Process not found in process list */
151
proc->status = status;
152
proc->completed = true;
133
155
int main(int argc, char *argv[]){
134
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
135
157
size_t d_name_len;
137
159
struct dirent *dirst;
140
162
int ret, maxfd = 0;
141
process *process_list = NULL;
142
165
bool debug = false;
143
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
char *plus_options = NULL;
171
char **plus_argv = NULL;
173
/* Establish a signal handler */
174
sigemptyset(&sigchld_action.sa_mask);
175
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
180
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
145
186
/* The options we understand. */
146
187
struct argp_option options[] = {
213
269
plugin *plugin_list = NULL;
215
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
217
273
.doc = "Mandos plugin runner -- Run plugins" };
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
288
exitstatus = EXIT_FAILURE;
291
plus_argv[0] = argv[0];
293
arg = strtok(plus_options, delims); /* Get first argument */
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
300
exitstatus = EXIT_FAILURE;
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
222
311
for(plugin *p = plugin_list; p != NULL; p=p->next){
339
440
addargument(p, *a);
447
exitstatus = EXIT_FAILURE;
450
ret = set_cloexec_flag(pipefd[0]);
452
perror("set_cloexec_flag");
453
exitstatus = EXIT_FAILURE;
456
ret = set_cloexec_flag(pipefd[1]);
458
perror("set_cloexec_flag");
459
exitstatus = EXIT_FAILURE;
462
/* Block SIGCHLD until process is safely in process list */
463
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
465
perror("sigprocmask");
466
exitstatus = EXIT_FAILURE;
469
// Starting a new process to be watched
342
470
pid_t pid = fork();
344
472
/* this is the child process */
346
close(pipefd[0]); /* close unused read end of pipe */
473
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
perror("sigprocmask");
347
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
486
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
above and must now close it manually here. */
352
490
if(execv(filename, p->argv) < 0){
355
492
_exit(EXIT_FAILURE);
359
498
close(pipefd[1]); /* close unused write end of pipe */
360
499
process *new_process = malloc(sizeof(process));
361
500
if (new_process == NULL){
362
501
perror("malloc");
363
exitstatus = EXIT_FAILURE;
367
new_process->fd = pipefd[0];
368
new_process->buffer = malloc(BUFFER_SIZE);
369
if (new_process->buffer == NULL){
371
exitstatus = EXIT_FAILURE;
374
new_process->buffer_size = BUFFER_SIZE;
375
new_process->buffer_length = 0;
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
504
perror("sigprocmask");
506
exitstatus = EXIT_FAILURE;
510
*new_process = (struct process){ .pid = pid,
512
.next = process_list };
514
process_list = new_process;
515
/* Unblock SIGCHLD so signal handler can be run if this process
516
has already completed */
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
519
perror("sigprocmask");
520
exitstatus = EXIT_FAILURE;
376
524
FD_SET(new_process->fd, &rfds_all);
378
526
if (maxfd < new_process->fd){
379
527
maxfd = new_process->fd;
383
new_process->next = process_list;
384
process_list = new_process;
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
389
if (process_list != NULL){
391
fd_set rfds = rfds_all;
392
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
393
if (select_ret == -1){
397
for(process *process_itr = process_list; process_itr != NULL;
398
process_itr = process_itr->next){
399
if(FD_ISSET(process_itr->fd, &rfds)){
400
if(process_itr->buffer_length + BUFFER_SIZE
401
> process_itr->buffer_size){
402
process_itr->buffer = realloc(process_itr->buffer,
403
process_itr->buffer_size
404
+ (size_t) BUFFER_SIZE);
405
if (process_itr->buffer == NULL){
409
process_itr->buffer_size += BUFFER_SIZE;
411
ret = read(process_itr->fd, process_itr->buffer
412
+ process_itr->buffer_length, BUFFER_SIZE);
414
/* Read error from this process; ignore it */
417
process_itr->buffer_length += (size_t) ret;
420
/* wait for process exit */
422
waitpid(process_itr->pid, &status, 0);
423
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
424
for(size_t written = 0;
425
written < process_itr->buffer_length;){
426
ret = write(STDOUT_FILENO,
427
process_itr->buffer + written,
428
process_itr->buffer_length - written);
433
written += (size_t)ret;
437
FD_CLR(process_itr->fd, &rfds_all);
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
548
fd_set rfds = rfds_all;
549
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
if (select_ret == -1){
552
exitstatus = EXIT_FAILURE;
555
/* OK, now either a process completed, or something can be read
557
for(process *proc = process_list; proc ; proc = proc->next){
558
/* Is this process completely done? */
559
if(proc->eof and proc->completed){
560
/* Only accept the plugin output if it exited cleanly */
561
if(not WIFEXITED(proc->status)
562
or WEXITSTATUS(proc->status) != 0){
563
/* Bad exit by plugin */
565
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
571
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
575
/* Remove the plugin */
576
FD_CLR(proc->fd, &rfds_all);
577
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
580
perror("sigprocmask");
581
exitstatus = EXIT_FAILURE;
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
592
p->next = proc->next;
597
/* We are done modifying process list, so unblock signal */
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
601
perror("sigprocmask");
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
610
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
619
exitstatus = EXIT_FAILURE;
625
/* This process has not completed. Does it have any output? */
626
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
/* This process had nothing to say at this time */
630
/* Before reading, make the process' data buffer large enough */
631
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
632
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
636
exitstatus = EXIT_FAILURE;
639
proc->buffer_size += BUFFER_SIZE;
641
/* Read from the process */
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
645
/* Read error from this process; ignore the error */
652
proc->buffer_length += (size_t) ret;
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
447
for(process *process_itr = process_list; process_itr != NULL;
448
process_itr = process_itr->next){
449
close(process_itr->fd);
450
kill(process_itr->pid, SIGTERM);
451
free(process_itr->buffer);
662
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
687
/* Wait for any remaining child processes to terminate */
464
695
return exitstatus;