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