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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 "indication_common.h"
#include "LMI_Account.h"
#include "LMI_Group.h"
#include "LMI_Identity.h"
static const char* allowed_classes[] = {
LMI_Account_ClassName,
LMI_Group_ClassName,
LMI_Identity_ClassName,
NULL };
#define EVENT_SIZE (sizeof(struct inotify_event))
#define BUF_LEN (10 * EVENT_SIZE + NAME_MAX + 1)
#define PASSWD_FILE "/etc/passwd"
#define GROUP_FILE "/etc/group"
bool filter_checker(const CMPISelectExp *filter)
{
/*
* Support only simple conditions and only on allowed_classes
* and type of `sourceinstance ISA allowed_class'
*/
CMPIStatus st;
CMPISelectCond *sec = CMGetDoc(filter, &st);
if (!sec) return false;
CMPICount count = CMGetSubCondCountAndType(sec, NULL, &st);
if (count != 1) return false;
CMPISubCond *sub = CMGetSubCondAt(sec, 0, &st);
if (!sub) return false;
count = CMGetPredicateCount(sub, &st);
if (count != 1) return false;
CMPIPredicate *pred = CMGetPredicateAt(sub, 0, &st);
if (!pred) return false;
CMPIType type;
CMPIPredOp op;
CMPIString *lhs = NULL;
CMPIString *rhs = NULL;
st = CMGetPredicateData(pred, &type, &op, &lhs, &rhs);
if (st.rc != CMPI_RC_OK || op != CMPI_PredOp_Isa) return false;
const char *rhs_str = CMGetCharsPtr(rhs, &st);
if (!rhs_str) return false;
unsigned i = 0;
while (allowed_classes[i]) {
if (strcasecmp(rhs_str, allowed_classes[i++]) == 0) return true;
}
return false;
}
/*
* 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);
}
}
#define ADD_WATCH(fd, wd, file)\
(wd) = inotify_add_watch((fd), (file), IN_CLOSE_WRITE | IN_MODIFY |\
IN_DELETE | IN_DELETE_SELF);\
if ((wd) < 0) {\
goto bail;\
}\
bool watcher(void *data)
{
struct timespec last_pwd = get_last_mod(PASSWD_FILE);
struct timespec last_grp = get_last_mod(GROUP_FILE);
int fd = inotify_init();
if (fd < 0) {
return false;
}
char buffer[BUF_LEN];
int wd_pwd, wd_grp;
ADD_WATCH(fd, wd_pwd, PASSWD_FILE);
ADD_WATCH(fd, wd_grp, GROUP_FILE);
do {
int len = 0, i = 0;
if ((len = read(fd, buffer, BUF_LEN)) < 0) {
close(fd);
return false;
}
while (i < len) {
struct inotify_event *event = (struct inotify_event *) &buffer[i];
switch (event->mask) {
case IN_MODIFY:
case IN_CLOSE_WRITE:
case IN_DELETE:
case IN_DELETE_SELF:
if (event->wd == wd_grp) {
if (timecmp(last_grp, get_last_mod(GROUP_FILE)) == -1) {
goto out;
}
} else {
if (timecmp(last_pwd, get_last_mod(PASSWD_FILE)) == -1) {
goto out;
}
}
break;
case IN_IGNORED:
if (event->wd == wd_grp) {
ADD_WATCH(fd, wd_grp, GROUP_FILE);
if (timecmp(last_grp, get_last_mod(GROUP_FILE)) == -1) {
goto out;
}
} else {
ADD_WATCH(fd, wd_pwd, PASSWD_FILE);
if (timecmp(last_pwd, get_last_mod(PASSWD_FILE)) == -1) {
goto out;
}
}
break;
}
i += EVENT_SIZE + event->len;
}
} while (1);
out:
inotify_rm_watch(fd, wd_pwd);
inotify_rm_watch(fd, wd_grp);
close(fd);
return true;
bail:
if (wd_pwd > 0) {
inotify_rm_watch(fd, wd_pwd);
}
if (wd_grp > 0) {
inotify_rm_watch(fd, wd_grp);
}
close(fd);
return false;
}
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