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