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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#define LOG_TAG "ClatdController"
#include <cutils/log.h>
#include "NetdConstants.h"
#include "ClatdController.h"
#include "Fwmark.h"
#include "NetdConstants.h"
#include "NetworkController.h"
ClatdController::ClatdController(NetworkController* controller)
: mNetCtrl(controller), mClatdPid(0) {
}
ClatdController::~ClatdController() {
}
int ClatdController::startClatd(char *interface) {
pid_t pid;
if(mClatdPid != 0) {
ALOGE("clatd already running");
errno = EBUSY;
return -1;
}
if (!isIfaceName(interface)) {
errno = ENOENT;
return -1;
}
ALOGD("starting clatd");
if ((pid = fork()) < 0) {
ALOGE("fork failed (%s)", strerror(errno));
return -1;
}
if (!pid) {
// Pass in the interface, a netid to use for DNS lookups, and a fwmark for outgoing packets.
unsigned netId = mNetCtrl->getNetworkForInterface(interface);
char netIdString[UINT32_STRLEN];
snprintf(netIdString, sizeof(netIdString), "%u", netId);
Fwmark fwmark = {netId, true, true, PERMISSION_SYSTEM};
char fwmarkString[UINT32_HEX_STRLEN];
snprintf(fwmarkString, sizeof(fwmarkString), "0x%x", fwmark.intValue);
char *args[] = {
(char *) "/system/bin/clatd",
(char *) "-i",
interface,
(char *) "-n",
netIdString,
(char *) "-m",
fwmarkString,
NULL
};
if (execv(args[0], args)) {
ALOGE("execv failed (%s)", strerror(errno));
}
ALOGE("Should never get here!");
_exit(0);
} else {
mClatdPid = pid;
ALOGD("clatd started");
}
return 0;
}
int ClatdController::stopClatd() {
if (mClatdPid == 0) {
ALOGE("clatd already stopped");
return -1;
}
ALOGD("Stopping clatd");
kill(mClatdPid, SIGTERM);
waitpid(mClatdPid, NULL, 0);
mClatdPid = 0;
ALOGD("clatd stopped");
return 0;
}
bool ClatdController::isClatdStarted() {
pid_t waitpid_status;
if(mClatdPid == 0) {
return false;
}
waitpid_status = waitpid(mClatdPid, NULL, WNOHANG);
if(waitpid_status != 0) {
mClatdPid = 0; // child exited, don't call waitpid on it again
}
return waitpid_status == 0; // 0 while child is running
}
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