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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <malloc.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <signal.h>
#include "module.h"
#include "version.h"
#include "util.h"
#include "modstat.h"
int sleep_interval = 300;
volatile int selfdestruct = 0;
void usage() {
printf("Usage: modclean [-i seconds] [-V] [-h]\n"
"\n"
" -i sec change sleep interval to sec seconds (default is 300)\n"
" -V show version and exit\n"
" -h show this text and exit\n");
}
void sighandler(int sig) {
selfdestruct=1;
}
int main(int argc, char** argv) {
size_t modules_count;
char* module_names = NULL;
int i;
while ((i=getopt(argc, argv, "i:V"))!=-1)
switch (i) {
case 'i':
{
char* end;
sleep_interval=strtol(optarg, &end, 10);
if (end[0]!=0) {
fprintf(stderr, "invalid parameter for -i");
return 1;
}
}
break;
case 'V':
fprintf(stderr, "modclean version " MODUTILS_VERSION "\n");
return 0;
default:
fprintf(stderr, "Invalid option: %c", i);
usage();
return 1;
}
if (optind!=argc) {
fprintf(stderr, "No parameters allowed\n");
usage();
return 1;
}
/* Check if the kernel supports modules */
if ((query_module(NULL, QM_MODULES, NULL, 0, &modules_count)==-1) && (errno!=ENOSPC)) {
printf("kernel does not support modules, not starting");
return 0;
}
/* Register a signal handler for TERM */
if (signal(SIGTERM, sighandler)==SIG_ERR) {
perror("error registering signal handler for SIGTERM: ");
return 1;
}
/* Do the usual daemon startup */
openlog("modclean", LOG_PID, LOG_DAEMON);
if (daemon(0, 0)==-1) {
perror("failed to initialize daemon");
return 1;
}
while (!selfdestruct) {
/* Get the list of loaded kernel modules */
get_kernel_info(0);
modules_count=n_module_stat;
module_names=xmalloc(l_module_name_list);
memcpy(module_names, module_name_list, l_module_name_list);
/* Try to delete modules */
if (delete_module(NULL)) {
syslog(LOG_ERR, "delete_module called failed: %s", strerror(errno));
break;
}
/* Make a snapshot if necessary */
snap_shot(module_names, modules_count);
/* And clean up again */
free(module_names);
module_names=NULL;
sleep(sleep_interval);
}
if (module_names!=NULL)
free(module_names);
closelog();
return (errno==0);
}
/* vim: ts=8 sw=4 ai si cindent
*/
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