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/*
* Copyright (C) 2013 Red Hat, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Roman Rakus <rrakus@redhat.com>
*/
/*
* Common functions for indications used in Account provider
*/
#include <cmpimacs.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/inotify.h>
#include <limits.h>
#include <errno.h>
#include "indication_common.h"
#include <globals.h>
#define EVENT_SIZE (sizeof(struct inotify_event))
#define BUF_LEN (10 * EVENT_SIZE + NAME_MAX + 1)
#define WATCH_PATH "/etc/"
#define PASSWD_FILE_NAME "passwd"
#define GROUP_FILE_NAME "group"
#define SETTLE_DELAY 1000 * 250 /* usec */
/*
* Returns last modification time for specified file name
*/
static struct timespec get_last_mod(const char* file)
{
struct stat buf = {0};
stat (file, &buf);
return buf.st_mtim;
}
/*
* Compares 2 timespecs
* return value is same like in strcmp
*/
static int timecmp(struct timespec a, struct timespec b)
{
if (a.tv_sec == b.tv_sec) {
if (a.tv_nsec == b.tv_nsec) {
return 0;
} else {
return (a.tv_nsec > b.tv_nsec ? 1 : -1);
}
} else {
return (a.tv_sec > b.tv_sec ? 1 : -1);
}
}
bool watcher_init(AccountIndication *ind)
{
ind->wd = -1;
ind->inotify_fd = inotify_init();
if (ind->inotify_fd < 0)
return false;
/* Get initial timestamps, at the beginning of watching. */
ind->last_pwd = get_last_mod(WATCH_PATH PASSWD_FILE_NAME);
ind->last_grp = get_last_mod(WATCH_PATH GROUP_FILE_NAME);
ind->wd = inotify_add_watch(ind->inotify_fd, WATCH_PATH,
IN_CLOSE_WRITE | IN_CREATE | IN_MODIFY | IN_MOVED_TO);
if (ind->wd < 0) {
watcher_destroy(ind);
return false;
}
return true;
}
void watcher_destroy(AccountIndication *ind)
{
if (ind->inotify_fd >= 0) {
if (ind->wd >= 0)
inotify_rm_watch(ind->inotify_fd, ind->wd);
close(ind->inotify_fd);
ind->wd = -1;
ind->inotify_fd = -1;
}
}
bool watcher(AccountIndication *ind, void **data)
{
struct timespec curr_pwd, curr_grp;
char buffer[BUF_LEN];
char errbuf[STRERROR_BUF_LEN];
if (ind->inotify_fd < 0)
return false;
do {
int len = 0, i = 0;
if ((len = read(ind->inotify_fd, buffer, BUF_LEN)) < 0 || len > (int) BUF_LEN) {
warn("account watcher: error reading from inotify fd: %s", strerror_r(errno, errbuf, sizeof(errbuf)));
watcher_destroy(ind);
watcher_init(ind);
return false;
}
while (i + (ssize_t) EVENT_SIZE < len) {
struct inotify_event *event = (struct inotify_event *) &buffer[i];
if (i + (ssize_t) EVENT_SIZE + event->len > len) {
error("Unable to create watcher, inotify initialization failed");
watcher_destroy(ind);
watcher_init(ind);
return false;
}
if (event->len > 1) {
if (strcmp(&event->name[0], PASSWD_FILE_NAME) == 0) {
curr_pwd = get_last_mod(WATCH_PATH PASSWD_FILE_NAME);
if (timecmp(ind->last_pwd, curr_pwd) == -1) {
ind->last_pwd = curr_pwd;
usleep(SETTLE_DELAY);
return true;
}
} else
if (strcmp(&event->name[0], GROUP_FILE_NAME) == 0) {
curr_grp = get_last_mod(WATCH_PATH GROUP_FILE_NAME);
if (timecmp(ind->last_grp, curr_grp) == -1) {
ind->last_grp = curr_grp;
usleep(SETTLE_DELAY);
return true;
}
}
}
i += EVENT_SIZE + event->len;
}
} while (1);
}
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