TetherController.cpp revision cf52faf90be32aab3d0c4736a95f26923227e475
19d10b341a0ba46f108cb96e46691197d778cbc06San Mehat/* 29d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * Copyright (C) 2008 The Android Open Source Project 39d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * 49d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * Licensed under the Apache License, Version 2.0 (the "License"); 59d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * you may not use this file except in compliance with the License. 69d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * You may obtain a copy of the License at 79d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * 89d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * http://www.apache.org/licenses/LICENSE-2.0 99d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * 109d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * Unless required by applicable law or agreed to in writing, software 119d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * distributed under the License is distributed on an "AS IS" BASIS, 129d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * See the License for the specific language governing permissions and 149d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * limitations under the License. 159d10b341a0ba46f108cb96e46691197d778cbc06San Mehat */ 169d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 179d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <stdlib.h> 189d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <errno.h> 1918737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat#include <fcntl.h> 2018737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat 219d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <sys/socket.h> 229d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <sys/stat.h> 2318737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat#include <sys/types.h> 2418737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat#include <sys/wait.h> 2518737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat 269d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <netinet/in.h> 279d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <arpa/inet.h> 289d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 299d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#define LOG_TAG "TetherController" 309d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include <cutils/log.h> 319d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 329d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 339d10b341a0ba46f108cb96e46691197d778cbc06San Mehat#include "TetherController.h" 349d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 359d10b341a0ba46f108cb96e46691197d778cbc06San MehatTetherController::TetherController() { 369d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mInterfaces = new InterfaceCollection(); 379d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders = new NetAddressCollection(); 389d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonFd = -1; 399d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonPid = 0; 409d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 419d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 429d10b341a0ba46f108cb96e46691197d778cbc06San MehatTetherController::~TetherController() { 439d10b341a0ba46f108cb96e46691197d778cbc06San Mehat InterfaceCollection::iterator it; 449d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 459d10b341a0ba46f108cb96e46691197d778cbc06San Mehat for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) { 469d10b341a0ba46f108cb96e46691197d778cbc06San Mehat free(*it); 479d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 489d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mInterfaces->clear(); 499d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 509d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders->clear(); 519d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 529d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 539d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::setIpFwdEnabled(bool enable) { 549d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 559d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("Setting IP forward enable = %d", enable); 569d10b341a0ba46f108cb96e46691197d778cbc06San Mehat int fd = open("/proc/sys/net/ipv4/ip_forward", O_WRONLY); 579d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (fd < 0) { 589d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to open ip_forward (%s)", strerror(errno)); 599d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 609d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 619d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 629d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (write(fd, (enable ? "1" : "0"), 1) != 1) { 639d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to write ip_forward (%s)", strerror(errno)); 649d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 659d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 669d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(fd); 679d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 689d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 699d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 709d10b341a0ba46f108cb96e46691197d778cbc06San Mehatbool TetherController::getIpFwdEnabled() { 719d10b341a0ba46f108cb96e46691197d778cbc06San Mehat int fd = open("/proc/sys/net/ipv4/ip_forward", O_RDONLY); 729d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 739d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (fd < 0) { 749d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to open ip_forward (%s)", strerror(errno)); 759d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return false; 769d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 779d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 789d10b341a0ba46f108cb96e46691197d778cbc06San Mehat char enabled; 799d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (read(fd, &enabled, 1) != 1) { 809d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to read ip_forward (%s)", strerror(errno)); 819d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 829d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 839d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 849d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(fd); 859d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 869d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return (enabled == '1' ? true : false); 879d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 889d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 899d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::startTethering(struct in_addr dhcpStart, struct in_addr dhcpEnd) { 909d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 919d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (mDaemonPid != 0) { 929d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Tethering already started"); 939d10b341a0ba46f108cb96e46691197d778cbc06San Mehat errno = EBUSY; 949d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 959d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 969d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 979d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("Starting tethering services"); 989d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 999d10b341a0ba46f108cb96e46691197d778cbc06San Mehat pid_t pid; 1009d10b341a0ba46f108cb96e46691197d778cbc06San Mehat int pipefd[2]; 1019d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1029d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (pipe(pipefd) < 0) { 1039d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("pipe failed (%s)", strerror(errno)); 1049d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 1059d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1069d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1079d10b341a0ba46f108cb96e46691197d778cbc06San Mehat /* 1089d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * TODO: Create a monitoring thread to handle and restart 1099d10b341a0ba46f108cb96e46691197d778cbc06San Mehat * the daemon if it exits prematurely 1109d10b341a0ba46f108cb96e46691197d778cbc06San Mehat */ 1119d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if ((pid = fork()) < 0) { 1129d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("fork failed (%s)", strerror(errno)); 1139d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(pipefd[0]); 1149d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(pipefd[1]); 1159d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 1169d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1179d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1189d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (!pid) { 1199d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(pipefd[1]); 1209d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (pipefd[0] != STDIN_FILENO) { 1219d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) { 1229d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("dup2 failed (%s)", strerror(errno)); 1239d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 1249d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1259d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(pipefd[0]); 1269d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1279d10b341a0ba46f108cb96e46691197d778cbc06San Mehat char *start = strdup(inet_ntoa(dhcpStart)); 1289d10b341a0ba46f108cb96e46691197d778cbc06San Mehat char *end = strdup(inet_ntoa(dhcpEnd)); 1299d10b341a0ba46f108cb96e46691197d778cbc06San Mehat char *range; 1309d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1319d10b341a0ba46f108cb96e46691197d778cbc06San Mehat asprintf(&range, "--dhcp-range=%s,%s,1h", start, end); 1329d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1339d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (execl("/system/bin/dnsmasq", "/system/bin/dnsmasq", "--no-daemon", "--no-resolv", 1349d10b341a0ba46f108cb96e46691197d778cbc06San Mehat "--no-poll", "--no-hosts", range, (char *) NULL)) { 1359d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("execl failed (%s)", strerror(errno)); 1369d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1379d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Should never get here!"); 1389d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 1399d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } else { 1409d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(pipefd[0]); 1419d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonPid = pid; 1429d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonFd = pipefd[1]; 1439d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("Tethering services running"); 1449d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1459d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1469d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 1479d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 1489d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1499d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::stopTethering() { 1509d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1519d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (mDaemonPid == 0) { 1529d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Tethering already stopped"); 1539d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 1549d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 1559d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1569d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("Stopping tethering services"); 1579d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1589d10b341a0ba46f108cb96e46691197d778cbc06San Mehat kill(mDaemonPid, SIGTERM); 15918737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat waitpid(mDaemonPid, NULL, 0); 1609d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonPid = 0; 1619d10b341a0ba46f108cb96e46691197d778cbc06San Mehat close(mDaemonFd); 1629d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDaemonFd = -1; 16318737845d3c6a60edd6f75ac441a1b3fed6d66a7San Mehat LOGD("Tethering services stopped"); 1649d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 1659d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 1669d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1679d10b341a0ba46f108cb96e46691197d778cbc06San Mehatbool TetherController::isTetheringStarted() { 1689d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return (mDaemonPid == 0 ? false : true); 1699d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 1709d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 171cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root#define MAX_CMD_SIZE 1024 172cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root 1739d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::setDnsForwarders(char **servers, int numServers) { 1749d10b341a0ba46f108cb96e46691197d778cbc06San Mehat int i; 175cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root char daemonCmd[MAX_CMD_SIZE]; 1769d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1779d10b341a0ba46f108cb96e46691197d778cbc06San Mehat strcpy(daemonCmd, "update_dns"); 178cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root int cmdLen = strlen(daemonCmd); 1799d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1809d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders->clear(); 1819d10b341a0ba46f108cb96e46691197d778cbc06San Mehat for (i = 0; i < numServers; i++) { 1829d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("setDnsForwarders(%d = '%s')", i, servers[i]); 1839d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1849d10b341a0ba46f108cb96e46691197d778cbc06San Mehat struct in_addr a; 1859d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 1869d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (!inet_aton(servers[i], &a)) { 1879d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to parse DNS server '%s'", servers[i]); 1889d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders->clear(); 1899d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 1909d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 191cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root 192cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root cmdLen += strlen(servers[i]); 193cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root if (cmdLen + 2 >= MAX_CMD_SIZE) { 194cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root LOGD("Too many DNS servers listed"); 195cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root break; 196cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root } 197cf52faf90be32aab3d0c4736a95f26923227e475Kenny Root 1989d10b341a0ba46f108cb96e46691197d778cbc06San Mehat strcat(daemonCmd, ":"); 1999d10b341a0ba46f108cb96e46691197d778cbc06San Mehat strcat(daemonCmd, servers[i]); 2009d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders->push_back(a); 2019d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 2029d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2039d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (mDaemonFd != -1) { 2049d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGD("Sending update msg to dnsmasq [%s]", daemonCmd); 2059d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (write(mDaemonFd, daemonCmd, strlen(daemonCmd) +1) < 0) { 2069d10b341a0ba46f108cb96e46691197d778cbc06San Mehat LOGE("Failed to send update command to dnsmasq (%s)", strerror(errno)); 2079d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mDnsForwarders->clear(); 2089d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 2099d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 2109d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 2119d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 2129d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 2139d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2149d10b341a0ba46f108cb96e46691197d778cbc06San MehatNetAddressCollection *TetherController::getDnsForwarders() { 2159d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return mDnsForwarders; 2169d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 2179d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2189d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::tetherInterface(const char *interface) { 2199d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mInterfaces->push_back(strdup(interface)); 2209d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 2219d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 2229d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2239d10b341a0ba46f108cb96e46691197d778cbc06San Mehatint TetherController::untetherInterface(const char *interface) { 2249d10b341a0ba46f108cb96e46691197d778cbc06San Mehat InterfaceCollection::iterator it; 2259d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2269d10b341a0ba46f108cb96e46691197d778cbc06San Mehat for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) { 2279d10b341a0ba46f108cb96e46691197d778cbc06San Mehat if (!strcmp(interface, *it)) { 2289d10b341a0ba46f108cb96e46691197d778cbc06San Mehat free(*it); 2299d10b341a0ba46f108cb96e46691197d778cbc06San Mehat mInterfaces->erase(it); 2309d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return 0; 2319d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 2329d10b341a0ba46f108cb96e46691197d778cbc06San Mehat } 2339d10b341a0ba46f108cb96e46691197d778cbc06San Mehat errno = ENOENT; 2349d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return -1; 2359d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 2369d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 2379d10b341a0ba46f108cb96e46691197d778cbc06San MehatInterfaceCollection *TetherController::getTetheredInterfaceList() { 2389d10b341a0ba46f108cb96e46691197d778cbc06San Mehat return mInterfaces; 2399d10b341a0ba46f108cb96e46691197d778cbc06San Mehat} 2409d10b341a0ba46f108cb96e46691197d778cbc06San Mehat 241