120 lines
2.7 KiB
C
120 lines
2.7 KiB
C
/*
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* utmpwatcher.c
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*
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* Copyright (C) 2006 Red Hat
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* see file 'COPYING' for use and warranty information
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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.*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Authors:
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* Dan Walsh <dwalsh@redhat.com>
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*
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*
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*/
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#define _GNU_SOURCE
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#include <sys/inotify.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <syslog.h>
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#include <limits.h>
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#include <utmp.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include "restorecond.h"
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#include "utmpwatcher.h"
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#include "stringslist.h"
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static struct stringsList *utmp_ptr = NULL;
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static int utmp_wd = -1;
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unsigned int utmpwatcher_handle(int inotify_fd, int wd)
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{
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int changed = 0;
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struct utmp u;
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const char *utmp_path = "/run/utmp";
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struct stringsList *prev_utmp_ptr = utmp_ptr;
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if (wd != utmp_wd)
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return -1;
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utmp_ptr = NULL;
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FILE *cfg = fopen(utmp_path, "r");
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if (!cfg)
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exitApp("Error reading utmp file.");
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while (fread(&u, sizeof(struct utmp), 1, cfg) > 0) {
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if (u.ut_type == USER_PROCESS)
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strings_list_add(&utmp_ptr, u.ut_user);
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}
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fclose(cfg);
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if (utmp_wd >= 0)
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inotify_rm_watch(inotify_fd, utmp_wd);
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utmp_wd =
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inotify_add_watch(inotify_fd, utmp_path, IN_MOVED_FROM | IN_MODIFY);
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if (utmp_wd == -1)
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exitApp("Error watching utmp file.");
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changed = strings_list_diff(prev_utmp_ptr, utmp_ptr);
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if (prev_utmp_ptr) {
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strings_list_free(prev_utmp_ptr);
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}
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return changed;
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}
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static void watch_file(int inotify_fd, const char *file)
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{
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struct stringsList *ptr = utmp_ptr;
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while (ptr) {
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struct passwd *pwd = getpwnam(ptr->string);
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if (pwd) {
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char *path = NULL;
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if (asprintf(&path, "%s%s", pwd->pw_dir, file) < 0)
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exitApp("Error allocating memory.");
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watch_list_add(inotify_fd, path);
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free(path);
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}
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ptr = ptr->next;
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}
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}
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void utmpwatcher_add(int inotify_fd, const char *path)
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{
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if (utmp_ptr == NULL) {
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utmpwatcher_handle(inotify_fd, utmp_wd);
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}
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watch_file(inotify_fd, path);
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}
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void utmpwatcher_free(void)
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{
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if (utmp_ptr)
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strings_list_free(utmp_ptr);
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}
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#ifdef TEST
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int main(int argc, char **argv)
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{
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read_utmp();
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return 0;
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}
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#endif
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