TetherController.cpp revision 9997f9a3edac2baac244c2fe8e49685a3be9f482
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 171d3165f10b12165f02b7015ac1a817c5f60e6399Neal Nguyen#include <stdlib.h> 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <errno.h> 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <fcntl.h> 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <string.h> 21696cba573e651b0e4f18a4718627c8ccecb3bda0Adam Powell 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <sys/socket.h> 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <sys/stat.h> 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <sys/types.h> 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <sys/wait.h> 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <netinet/in.h> 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <arpa/inet.h> 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#define LOG_TAG "TetherController" 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <cutils/log.h> 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include <cutils/properties.h> 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project#include "TetherController.h" 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source ProjectTetherController::TetherController() { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInterfaces = new InterfaceCollection(); 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDnsForwarders = new NetAddressCollection(); 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDaemonFd = -1; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDaemonPid = 0; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source ProjectTetherController::~TetherController() { 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project InterfaceCollection::iterator it; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) { 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project free(*it); 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mInterfaces->clear(); 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDnsForwarders->clear(); 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint TetherController::setIpFwdEnabled(bool enable) { 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGD("Setting IP forward enable = %d", enable); 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // In BP tools mode, do not disable IP forwarding 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project char bootmode[PROPERTY_VALUE_MAX] = {0}; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project property_get("ro.bootmode", bootmode, "unknown"); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((enable == false) && (0 == strcmp("bp-tools", bootmode))) { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fd = open("/proc/sys/net/ipv4/ip_forward", O_WRONLY); 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fd < 0) { 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Failed to open ip_forward (%s)", strerror(errno)); 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (write(fd, (enable ? "1" : "0"), 1) != 1) { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Failed to write ip_forward (%s)", strerror(errno)); 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(fd); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(fd); 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectbool TetherController::getIpFwdEnabled() { 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fd = open("/proc/sys/net/ipv4/ip_forward", O_RDONLY); 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fd < 0) { 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Failed to open ip_forward (%s)", strerror(errno)); 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project char enabled; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (read(fd, &enabled, 1) != 1) { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Failed to read ip_forward (%s)", strerror(errno)); 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(fd); 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(fd); 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (enabled == '1' ? true : false); 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint TetherController::startTethering(int num_addrs, struct in_addr* addrs) { 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mDaemonPid != 0) { 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Tethering already started"); 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project errno = EBUSY; 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGD("Starting tethering services"); 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pid_t pid; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int pipefd[2]; 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (pipe(pipefd) < 0) { 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("pipe failed (%s)", strerror(errno)); 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * TODO: Create a monitoring thread to handle and restart 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the daemon if it exits prematurely 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((pid = fork()) < 0) { 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("fork failed (%s)", strerror(errno)); 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(pipefd[0]); 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(pipefd[1]); 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!pid) { 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(pipefd[1]); 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (pipefd[0] != STDIN_FILENO) { 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("dup2 failed (%s)", strerror(errno)); 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return -1; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(pipefd[0]); 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int num_processed_args = 7 + (num_addrs/2) + 1; // 1 null for termination 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project char **args = (char **)malloc(sizeof(char *) * num_processed_args); 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[num_processed_args - 1] = NULL; 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[0] = (char *)"/system/bin/dnsmasq"; 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[1] = (char *)"--keep-in-foreground"; 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[2] = (char *)"--no-resolv"; 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[3] = (char *)"--no-poll"; 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // TODO: pipe through metered status from ConnService 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[4] = (char *)"--dhcp-option-force=43,ANDROID_METERED"; 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[5] = (char *)"--pid-file"; 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project args[6] = (char *)""; 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int nextArg = 7; 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int addrIndex=0; addrIndex < num_addrs;) { 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project char *start = strdup(inet_ntoa(addrs[addrIndex++])); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project char *end = strdup(inet_ntoa(addrs[addrIndex++])); 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project asprintf(&(args[nextArg++]),"--dhcp-range=%s,%s,1h", start, end); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (execv(args[0], args)) { 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("execl failed (%s)", strerror(errno)); 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGE("Should never get here!"); 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project free(args); 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project close(pipefd[0]); 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDaemonPid = pid; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mDaemonFd = pipefd[1]; 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ALOGD("Tethering services running"); 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectint TetherController::stopTethering() { 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mDaemonPid == 0) { 175 ALOGE("Tethering already stopped"); 176 return 0; 177 } 178 179 ALOGD("Stopping tethering services"); 180 181 kill(mDaemonPid, SIGTERM); 182 waitpid(mDaemonPid, NULL, 0); 183 mDaemonPid = 0; 184 close(mDaemonFd); 185 mDaemonFd = -1; 186 ALOGD("Tethering services stopped"); 187 return 0; 188} 189 190bool TetherController::isTetheringStarted() { 191 return (mDaemonPid == 0 ? false : true); 192} 193 194#define MAX_CMD_SIZE 1024 195 196int TetherController::setDnsForwarders(char **servers, int numServers) { 197 int i; 198 char daemonCmd[MAX_CMD_SIZE]; 199 200 strcpy(daemonCmd, "update_dns"); 201 int cmdLen = strlen(daemonCmd); 202 203 mDnsForwarders->clear(); 204 for (i = 0; i < numServers; i++) { 205 ALOGD("setDnsForwarders(%d = '%s')", i, servers[i]); 206 207 struct in_addr a; 208 209 if (!inet_aton(servers[i], &a)) { 210 ALOGE("Failed to parse DNS server '%s'", servers[i]); 211 mDnsForwarders->clear(); 212 return -1; 213 } 214 215 cmdLen += strlen(servers[i]); 216 if (cmdLen + 2 >= MAX_CMD_SIZE) { 217 ALOGD("Too many DNS servers listed"); 218 break; 219 } 220 221 strcat(daemonCmd, ":"); 222 strcat(daemonCmd, servers[i]); 223 mDnsForwarders->push_back(a); 224 } 225 226 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(); 231 return -1; 232 } 233 } 234 return 0; 235} 236 237NetAddressCollection *TetherController::getDnsForwarders() { 238 return mDnsForwarders; 239} 240 241int TetherController::tetherInterface(const char *interface) { 242 mInterfaces->push_back(strdup(interface)); 243 return 0; 244} 245 246int TetherController::untetherInterface(const char *interface) { 247 InterfaceCollection::iterator it; 248 249 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) { 250 if (!strcmp(interface, *it)) { 251 free(*it); 252 mInterfaces->erase(it); 253 return 0; 254 } 255 } 256 errno = ENOENT; 257 return -1; 258} 259 260InterfaceCollection *TetherController::getTetheredInterfaceList() { 261 return mInterfaces; 262} 263