2 * Copyright (C) 2008 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
21 #include <sys/types.h>
24 #define LOG_TAG "ClatdController"
25 #include <cutils/log.h>
27 #include <resolv_netid.h>
29 #include "NetdConstants.h"
30 #include "ClatdController.h"
32 #include "NetdConstants.h"
33 #include "NetworkController.h"
35 static const char* kClatdPath = "/system/bin/clatd";
37 ClatdController::ClatdController(NetworkController* controller)
38 : mNetCtrl(controller) {
41 ClatdController::~ClatdController() {
44 // Returns the PID of the clatd running on interface |interface|, or 0 if clatd is not running on
46 pid_t ClatdController::getClatdPid(char* interface) {
47 auto it = mClatdPids.find(interface);
48 return (it == mClatdPids.end() ? 0 : it->second);
51 int ClatdController::startClatd(char* interface) {
52 pid_t pid = getClatdPid(interface);
55 ALOGE("clatd pid=%d already started on %s", pid, interface);
60 // Pass in the interface, a netid to use for DNS lookups, and a fwmark for outgoing packets.
61 unsigned netId = mNetCtrl->getNetworkForInterface(interface);
62 if (netId == NETID_UNSET) {
63 ALOGE("interface %s not assigned to any netId", interface);
68 char netIdString[UINT32_STRLEN];
69 snprintf(netIdString, sizeof(netIdString), "%u", netId);
73 fwmark.explicitlySelected = true;
74 fwmark.protectedFromVpn = true;
75 fwmark.permission = PERMISSION_SYSTEM;
77 char fwmarkString[UINT32_HEX_STRLEN];
78 snprintf(fwmarkString, sizeof(fwmarkString), "0x%x", fwmark.intValue);
80 ALOGD("starting clatd on %s", interface);
82 std::string progname("clatd-");
83 progname += interface;
85 if ((pid = fork()) < 0) {
86 ALOGE("fork failed (%s)", strerror(errno));
92 (char *) progname.c_str(),
102 if (execv(kClatdPath, args)) {
103 ALOGE("execv failed (%s)", strerror(errno));
106 ALOGE("Should never get here!");
109 mClatdPids[interface] = pid;
110 ALOGD("clatd started on %s", interface);
116 int ClatdController::stopClatd(char* interface) {
117 pid_t pid = getClatdPid(interface);
120 ALOGE("clatd already stopped");
124 ALOGD("Stopping clatd pid=%d on %s", pid, interface);
127 waitpid(pid, NULL, 0);
128 mClatdPids.erase(interface);
130 ALOGD("clatd on %s stopped", interface);
135 bool ClatdController::isClatdStarted(char* interface) {
136 pid_t waitpid_status;
137 pid_t pid = getClatdPid(interface);
141 waitpid_status = waitpid(pid, NULL, WNOHANG);
142 if (waitpid_status != 0) {
143 mClatdPids.erase(interface); // child exited, don't call waitpid on it again
145 return waitpid_status == 0; // 0 while child is running