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>
35 #include "NetdConstants.h"
36 #include "Permission.h"
37 #include "TetherController.h"
39 TetherController::TetherController() {
40 mInterfaces = new InterfaceCollection();
42 mDnsForwarders = new NetAddressCollection();
47 TetherController::~TetherController() {
48 InterfaceCollection::iterator it;
50 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
55 mDnsForwarders->clear();
58 int TetherController::setIpFwdEnabled(bool enable) {
60 ALOGD("Setting IP forward enable = %d", enable);
62 // In BP tools mode, do not disable IP forwarding
63 char bootmode[PROPERTY_VALUE_MAX] = {0};
64 property_get("ro.bootmode", bootmode, "unknown");
65 if ((enable == false) && (0 == strcmp("bp-tools", bootmode))) {
69 int fd = open("/proc/sys/net/ipv4/ip_forward", O_WRONLY);
71 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
75 if (write(fd, (enable ? "1" : "0"), 1) != 1) {
76 ALOGE("Failed to write ip_forward (%s)", strerror(errno));
84 bool TetherController::getIpFwdEnabled() {
85 int fd = open("/proc/sys/net/ipv4/ip_forward", O_RDONLY);
88 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
93 if (read(fd, &enabled, 1) != 1) {
94 ALOGE("Failed to read ip_forward (%s)", strerror(errno));
100 return (enabled == '1' ? true : false);
103 #define TETHER_START_CONST_ARG 8
105 int TetherController::startTethering(int num_addrs, struct in_addr* addrs) {
106 if (mDaemonPid != 0) {
107 ALOGE("Tethering already started");
112 ALOGD("Starting tethering services");
117 if (pipe(pipefd) < 0) {
118 ALOGE("pipe failed (%s)", strerror(errno));
123 * TODO: Create a monitoring thread to handle and restart
124 * the daemon if it exits prematurely
126 if ((pid = fork()) < 0) {
127 ALOGE("fork failed (%s)", strerror(errno));
135 if (pipefd[0] != STDIN_FILENO) {
136 if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
137 ALOGE("dup2 failed (%s)", strerror(errno));
143 int num_processed_args = TETHER_START_CONST_ARG + (num_addrs/2) + 1;
144 char **args = (char **)malloc(sizeof(char *) * num_processed_args);
145 args[num_processed_args - 1] = NULL;
146 args[0] = (char *)"/system/bin/dnsmasq";
147 args[1] = (char *)"--keep-in-foreground";
148 args[2] = (char *)"--no-resolv";
149 args[3] = (char *)"--no-poll";
150 args[4] = (char *)"--dhcp-authoritative";
151 // TODO: pipe through metered status from ConnService
152 args[5] = (char *)"--dhcp-option-force=43,ANDROID_METERED";
153 args[6] = (char *)"--pid-file";
154 args[7] = (char *)"";
156 int nextArg = TETHER_START_CONST_ARG;
157 for (int addrIndex=0; addrIndex < num_addrs;) {
158 char *start = strdup(inet_ntoa(addrs[addrIndex++]));
159 char *end = strdup(inet_ntoa(addrs[addrIndex++]));
160 asprintf(&(args[nextArg++]),"--dhcp-range=%s,%s,1h", start, end);
165 if (execv(args[0], args)) {
166 ALOGE("execl failed (%s)", strerror(errno));
168 ALOGE("Should never get here!");
173 mDaemonFd = pipefd[1];
174 applyDnsInterfaces();
175 ALOGD("Tethering services running");
181 int TetherController::stopTethering() {
183 if (mDaemonPid == 0) {
184 ALOGE("Tethering already stopped");
188 ALOGD("Stopping tethering services");
190 kill(mDaemonPid, SIGTERM);
191 waitpid(mDaemonPid, NULL, 0);
195 ALOGD("Tethering services stopped");
199 bool TetherController::isTetheringStarted() {
200 return (mDaemonPid == 0 ? false : true);
203 #define MAX_CMD_SIZE 1024
205 int TetherController::setDnsForwarders(unsigned netId, char **servers, int numServers) {
207 char daemonCmd[MAX_CMD_SIZE];
210 fwmark.netId = netId;
211 fwmark.explicitlySelected = true;
212 fwmark.protectedFromVpn = true;
213 fwmark.permission = PERMISSION_SYSTEM;
215 snprintf(daemonCmd, sizeof(daemonCmd), "update_dns:0x%x", fwmark.intValue);
216 int cmdLen = strlen(daemonCmd);
218 mDnsForwarders->clear();
219 for (i = 0; i < numServers; i++) {
220 ALOGD("setDnsForwarders(0x%x %d = '%s')", fwmark.intValue, i, servers[i]);
224 if (!inet_aton(servers[i], &a)) {
225 ALOGE("Failed to parse DNS server '%s'", servers[i]);
226 mDnsForwarders->clear();
230 cmdLen += (strlen(servers[i]) + 1);
231 if (cmdLen + 1 >= MAX_CMD_SIZE) {
232 ALOGD("Too many DNS servers listed");
236 strcat(daemonCmd, ":");
237 strcat(daemonCmd, servers[i]);
238 mDnsForwarders->push_back(a);
242 if (mDaemonFd != -1) {
243 ALOGD("Sending update msg to dnsmasq [%s]", daemonCmd);
244 if (write(mDaemonFd, daemonCmd, strlen(daemonCmd) +1) < 0) {
245 ALOGE("Failed to send update command to dnsmasq (%s)", strerror(errno));
246 mDnsForwarders->clear();
253 unsigned TetherController::getDnsNetId() {
257 NetAddressCollection *TetherController::getDnsForwarders() {
258 return mDnsForwarders;
261 int TetherController::applyDnsInterfaces() {
262 char daemonCmd[MAX_CMD_SIZE];
264 strcpy(daemonCmd, "update_ifaces");
265 int cmdLen = strlen(daemonCmd);
266 InterfaceCollection::iterator it;
267 bool haveInterfaces = false;
269 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
270 cmdLen += (strlen(*it) + 1);
271 if (cmdLen + 1 >= MAX_CMD_SIZE) {
272 ALOGD("Too many DNS ifaces listed");
276 strcat(daemonCmd, ":");
277 strcat(daemonCmd, *it);
278 haveInterfaces = true;
281 if ((mDaemonFd != -1) && haveInterfaces) {
282 ALOGD("Sending update msg to dnsmasq [%s]", daemonCmd);
283 if (write(mDaemonFd, daemonCmd, strlen(daemonCmd) +1) < 0) {
284 ALOGE("Failed to send update command to dnsmasq (%s)", strerror(errno));
291 int TetherController::tetherInterface(const char *interface) {
292 ALOGD("tetherInterface(%s)", interface);
293 if (!isIfaceName(interface)) {
297 mInterfaces->push_back(strdup(interface));
299 if (applyDnsInterfaces()) {
300 InterfaceCollection::iterator it;
301 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
302 if (!strcmp(interface, *it)) {
304 mInterfaces->erase(it);
314 int TetherController::untetherInterface(const char *interface) {
315 InterfaceCollection::iterator it;
317 ALOGD("untetherInterface(%s)", interface);
319 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
320 if (!strcmp(interface, *it)) {
322 mInterfaces->erase(it);
324 return applyDnsInterfaces();
331 InterfaceCollection *TetherController::getTetheredInterfaceList() {