| /* |
| * 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; |
| |
| fwmark.netId = netId; |
| fwmark.explicitlySelected = true; |
| fwmark.protectedFromVpn = true; |
| fwmark.permission = 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 |
| } |