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.
22 #include <sys/socket.h>
24 #include <sys/types.h>
27 #include <netinet/in.h>
28 #include <arpa/inet.h>
30 #define LOG_TAG "TetherController"
31 #include <cutils/log.h>
32 #include <cutils/properties.h>
34 #include "TetherController.h"
36 TetherController::TetherController() {
37 mInterfaces = new InterfaceCollection();
38 mDnsForwarders = new NetAddressCollection();
43 TetherController::~TetherController() {
44 InterfaceCollection::iterator it;
46 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
51 mDnsForwarders->clear();
54 int TetherController::setIpFwdEnabled(bool enable) {
56 ALOGD("Setting IP forward enable = %d", enable);
58 // In BP tools mode, do not disable IP forwarding
59 char bootmode[PROPERTY_VALUE_MAX] = {0};
60 property_get("ro.bootmode", bootmode, "unknown");
61 if ((enable == false) && (0 == strcmp("bp-tools", bootmode))) {
65 int fd = open("/proc/sys/net/ipv4/ip_forward", O_WRONLY);
67 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
71 if (write(fd, (enable ? "1" : "0"), 1) != 1) {
72 ALOGE("Failed to write ip_forward (%s)", strerror(errno));
80 bool TetherController::getIpFwdEnabled() {
81 int fd = open("/proc/sys/net/ipv4/ip_forward", O_RDONLY);
84 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
89 if (read(fd, &enabled, 1) != 1) {
90 ALOGE("Failed to read ip_forward (%s)", strerror(errno));
96 return (enabled == '1' ? true : false);
99 int TetherController::startTethering(int num_addrs, struct in_addr* addrs) {
100 if (mDaemonPid != 0) {
101 ALOGE("Tethering already started");
106 ALOGD("Starting tethering services");
111 if (pipe(pipefd) < 0) {
112 ALOGE("pipe failed (%s)", strerror(errno));
117 * TODO: Create a monitoring thread to handle and restart
118 * the daemon if it exits prematurely
120 if ((pid = fork()) < 0) {
121 ALOGE("fork failed (%s)", strerror(errno));
129 if (pipefd[0] != STDIN_FILENO) {
130 if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
131 ALOGE("dup2 failed (%s)", strerror(errno));
137 int num_processed_args = 7 + (num_addrs/2) + 1; // 1 null for termination
138 char **args = (char **)malloc(sizeof(char *) * num_processed_args);
139 args[num_processed_args - 1] = NULL;
140 args[0] = (char *)"/system/bin/dnsmasq";
141 args[1] = (char *)"--keep-in-foreground";
142 args[2] = (char *)"--no-resolv";
143 args[3] = (char *)"--no-poll";
144 // TODO: pipe through metered status from ConnService
145 args[4] = (char *)"--dhcp-option-force=43,ANDROID_METERED";
146 args[5] = (char *)"--pid-file";
147 args[6] = (char *)"";
150 for (int addrIndex=0; addrIndex < num_addrs;) {
151 char *start = strdup(inet_ntoa(addrs[addrIndex++]));
152 char *end = strdup(inet_ntoa(addrs[addrIndex++]));
153 asprintf(&(args[nextArg++]),"--dhcp-range=%s,%s,1h", start, end);
156 if (execv(args[0], args)) {
157 ALOGE("execl failed (%s)", strerror(errno));
159 ALOGE("Should never get here!");
165 mDaemonFd = pipefd[1];
166 ALOGD("Tethering services running");
172 int TetherController::stopTethering() {
174 if (mDaemonPid == 0) {
175 ALOGE("Tethering already stopped");
179 ALOGD("Stopping tethering services");
181 kill(mDaemonPid, SIGTERM);
182 waitpid(mDaemonPid, NULL, 0);
186 ALOGD("Tethering services stopped");
190 bool TetherController::isTetheringStarted() {
191 return (mDaemonPid == 0 ? false : true);
194 #define MAX_CMD_SIZE 1024
196 int TetherController::setDnsForwarders(char **servers, int numServers) {
198 char daemonCmd[MAX_CMD_SIZE];
200 strcpy(daemonCmd, "update_dns");
201 int cmdLen = strlen(daemonCmd);
203 mDnsForwarders->clear();
204 for (i = 0; i < numServers; i++) {
205 ALOGD("setDnsForwarders(%d = '%s')", i, servers[i]);
209 if (!inet_aton(servers[i], &a)) {
210 ALOGE("Failed to parse DNS server '%s'", servers[i]);
211 mDnsForwarders->clear();
215 cmdLen += strlen(servers[i]);
216 if (cmdLen + 2 >= MAX_CMD_SIZE) {
217 ALOGD("Too many DNS servers listed");
221 strcat(daemonCmd, ":");
222 strcat(daemonCmd, servers[i]);
223 mDnsForwarders->push_back(a);
226 if (mDaemonFd != -1) {
227 ALOGD("Sending update msg to dnsmasq [%s]", daemonCmd);
228 if (write(mDaemonFd, daemonCmd, strlen(daemonCmd) +1) < 0) {
229 ALOGE("Failed to send update command to dnsmasq (%s)", strerror(errno));
230 mDnsForwarders->clear();
237 NetAddressCollection *TetherController::getDnsForwarders() {
238 return mDnsForwarders;
241 int TetherController::tetherInterface(const char *interface) {
242 mInterfaces->push_back(strdup(interface));
246 int TetherController::untetherInterface(const char *interface) {
247 InterfaceCollection::iterator it;
249 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
250 if (!strcmp(interface, *it)) {
252 mInterfaces->erase(it);
260 InterfaceCollection *TetherController::getTetheredInterfaceList() {