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San Mehat9d10b342010-01-18 09:51:02 -08001/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17#include <stdlib.h>
18#include <errno.h>
San Mehat18737842010-01-21 09:22:43 -080019#include <fcntl.h>
Olivier Baillyff2c0d82010-11-17 11:45:07 -080020#include <string.h>
San Mehat18737842010-01-21 09:22:43 -080021
San Mehat9d10b342010-01-18 09:51:02 -080022#include <sys/socket.h>
23#include <sys/stat.h>
San Mehat18737842010-01-21 09:22:43 -080024#include <sys/types.h>
25#include <sys/wait.h>
26
San Mehat9d10b342010-01-18 09:51:02 -080027#include <netinet/in.h>
28#include <arpa/inet.h>
29
30#define LOG_TAG "TetherController"
31#include <cutils/log.h>
Kazuhiro Ondo6b858eb2011-06-24 20:31:03 -050032#include <cutils/properties.h>
San Mehat9d10b342010-01-18 09:51:02 -080033
JP Abgrall69261cb2014-06-19 18:35:24 -070034#include "NetdConstants.h"
San Mehat9d10b342010-01-18 09:51:02 -080035#include "TetherController.h"
Sreeram Ramachandran6a773532014-07-11 09:10:20 -070036#include "NetworkController.h"
San Mehat9d10b342010-01-18 09:51:02 -080037
Sreeram Ramachandran6a773532014-07-11 09:10:20 -070038TetherController::TetherController(NetworkController* networkController) :
39 mNetworkController(networkController) {
San Mehat9d10b342010-01-18 09:51:02 -080040 mInterfaces = new InterfaceCollection();
41 mDnsForwarders = new NetAddressCollection();
42 mDaemonFd = -1;
43 mDaemonPid = 0;
44}
45
46TetherController::~TetherController() {
47 InterfaceCollection::iterator it;
48
49 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
50 free(*it);
51 }
52 mInterfaces->clear();
53
54 mDnsForwarders->clear();
55}
56
57int TetherController::setIpFwdEnabled(bool enable) {
58
Steve Block7b984e32011-12-20 16:22:42 +000059 ALOGD("Setting IP forward enable = %d", enable);
Kazuhiro Ondo6b858eb2011-06-24 20:31:03 -050060
61 // In BP tools mode, do not disable IP forwarding
62 char bootmode[PROPERTY_VALUE_MAX] = {0};
63 property_get("ro.bootmode", bootmode, "unknown");
64 if ((enable == false) && (0 == strcmp("bp-tools", bootmode))) {
65 return 0;
66 }
67
San Mehat9d10b342010-01-18 09:51:02 -080068 int fd = open("/proc/sys/net/ipv4/ip_forward", O_WRONLY);
69 if (fd < 0) {
Steve Block5ea0c052012-01-06 19:18:11 +000070 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -080071 return -1;
72 }
73
74 if (write(fd, (enable ? "1" : "0"), 1) != 1) {
Steve Block5ea0c052012-01-06 19:18:11 +000075 ALOGE("Failed to write ip_forward (%s)", strerror(errno));
Robert Greenwalt37dc4a52010-04-28 16:05:04 -070076 close(fd);
San Mehat9d10b342010-01-18 09:51:02 -080077 return -1;
78 }
79 close(fd);
80 return 0;
81}
82
83bool TetherController::getIpFwdEnabled() {
84 int fd = open("/proc/sys/net/ipv4/ip_forward", O_RDONLY);
85
86 if (fd < 0) {
Steve Block5ea0c052012-01-06 19:18:11 +000087 ALOGE("Failed to open ip_forward (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -080088 return false;
89 }
90
91 char enabled;
92 if (read(fd, &enabled, 1) != 1) {
Steve Block5ea0c052012-01-06 19:18:11 +000093 ALOGE("Failed to read ip_forward (%s)", strerror(errno));
Robert Greenwalt37dc4a52010-04-28 16:05:04 -070094 close(fd);
San Mehat9d10b342010-01-18 09:51:02 -080095 return -1;
96 }
97
98 close(fd);
San Mehat9d10b342010-01-18 09:51:02 -080099 return (enabled == '1' ? true : false);
100}
101
Dmitry Shmidtbc775ed2013-12-12 16:41:16 -0800102#define TETHER_START_CONST_ARG 8
103
Robert Greenwalt3208ea02010-03-24 16:32:55 -0700104int TetherController::startTethering(int num_addrs, struct in_addr* addrs) {
San Mehat9d10b342010-01-18 09:51:02 -0800105 if (mDaemonPid != 0) {
Steve Block5ea0c052012-01-06 19:18:11 +0000106 ALOGE("Tethering already started");
San Mehat9d10b342010-01-18 09:51:02 -0800107 errno = EBUSY;
108 return -1;
109 }
110
Steve Block7b984e32011-12-20 16:22:42 +0000111 ALOGD("Starting tethering services");
San Mehat9d10b342010-01-18 09:51:02 -0800112
113 pid_t pid;
114 int pipefd[2];
115
116 if (pipe(pipefd) < 0) {
Steve Block5ea0c052012-01-06 19:18:11 +0000117 ALOGE("pipe failed (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -0800118 return -1;
119 }
120
121 /*
122 * TODO: Create a monitoring thread to handle and restart
123 * the daemon if it exits prematurely
124 */
125 if ((pid = fork()) < 0) {
Steve Block5ea0c052012-01-06 19:18:11 +0000126 ALOGE("fork failed (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -0800127 close(pipefd[0]);
128 close(pipefd[1]);
129 return -1;
130 }
131
132 if (!pid) {
133 close(pipefd[1]);
134 if (pipefd[0] != STDIN_FILENO) {
135 if (dup2(pipefd[0], STDIN_FILENO) != STDIN_FILENO) {
Steve Block5ea0c052012-01-06 19:18:11 +0000136 ALOGE("dup2 failed (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -0800137 return -1;
138 }
139 close(pipefd[0]);
140 }
San Mehat9d10b342010-01-18 09:51:02 -0800141
Dmitry Shmidtbc775ed2013-12-12 16:41:16 -0800142 int num_processed_args = TETHER_START_CONST_ARG + (num_addrs/2) + 1;
Robert Greenwalt3208ea02010-03-24 16:32:55 -0700143 char **args = (char **)malloc(sizeof(char *) * num_processed_args);
144 args[num_processed_args - 1] = NULL;
145 args[0] = (char *)"/system/bin/dnsmasq";
Peter Nilssonb756f692011-09-08 09:48:31 -0700146 args[1] = (char *)"--keep-in-foreground";
Robert Greenwalt3208ea02010-03-24 16:32:55 -0700147 args[2] = (char *)"--no-resolv";
148 args[3] = (char *)"--no-poll";
Dmitry Shmidtbc775ed2013-12-12 16:41:16 -0800149 args[4] = (char *)"--dhcp-authoritative";
Jeff Sharkey6df79da2012-04-18 21:53:35 -0700150 // TODO: pipe through metered status from ConnService
Dmitry Shmidtbc775ed2013-12-12 16:41:16 -0800151 args[5] = (char *)"--dhcp-option-force=43,ANDROID_METERED";
152 args[6] = (char *)"--pid-file";
153 args[7] = (char *)"";
San Mehat9d10b342010-01-18 09:51:02 -0800154
Dmitry Shmidtbc775ed2013-12-12 16:41:16 -0800155 int nextArg = TETHER_START_CONST_ARG;
Robert Greenwalt3208ea02010-03-24 16:32:55 -0700156 for (int addrIndex=0; addrIndex < num_addrs;) {
157 char *start = strdup(inet_ntoa(addrs[addrIndex++]));
158 char *end = strdup(inet_ntoa(addrs[addrIndex++]));
159 asprintf(&(args[nextArg++]),"--dhcp-range=%s,%s,1h", start, end);
160 }
161
162 if (execv(args[0], args)) {
Steve Block5ea0c052012-01-06 19:18:11 +0000163 ALOGE("execl failed (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -0800164 }
Steve Block5ea0c052012-01-06 19:18:11 +0000165 ALOGE("Should never get here!");
JP Abgrallce4f3792012-08-06 13:44:44 -0700166 _exit(-1);
San Mehat9d10b342010-01-18 09:51:02 -0800167 } else {
168 close(pipefd[0]);
169 mDaemonPid = pid;
170 mDaemonFd = pipefd[1];
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800171 applyDnsInterfaces();
Steve Block7b984e32011-12-20 16:22:42 +0000172 ALOGD("Tethering services running");
San Mehat9d10b342010-01-18 09:51:02 -0800173 }
174
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700175 unsigned netId = mNetworkController->getNetIdForLocalNetwork();
176 if (int ret = mNetworkController->createLocalNetwork(netId)) {
177 return ret;
178 }
179 // If any interfaces have already been configured, add them to the local network now.
180 for (InterfaceCollection::iterator it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
181 if (int ret = mNetworkController->addInterfaceToNetwork(netId, *it)) {
182 return ret;
183 }
184 }
185
San Mehat9d10b342010-01-18 09:51:02 -0800186 return 0;
187}
188
189int TetherController::stopTethering() {
190
191 if (mDaemonPid == 0) {
Steve Block5ea0c052012-01-06 19:18:11 +0000192 ALOGE("Tethering already stopped");
San Mehat9d10b342010-01-18 09:51:02 -0800193 return 0;
194 }
195
Steve Block7b984e32011-12-20 16:22:42 +0000196 ALOGD("Stopping tethering services");
San Mehat9d10b342010-01-18 09:51:02 -0800197
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700198 // Ignore any error.
199 (void) mNetworkController->destroyNetwork(mNetworkController->getNetIdForLocalNetwork());
200
San Mehat9d10b342010-01-18 09:51:02 -0800201 kill(mDaemonPid, SIGTERM);
San Mehat18737842010-01-21 09:22:43 -0800202 waitpid(mDaemonPid, NULL, 0);
San Mehat9d10b342010-01-18 09:51:02 -0800203 mDaemonPid = 0;
204 close(mDaemonFd);
205 mDaemonFd = -1;
Steve Block7b984e32011-12-20 16:22:42 +0000206 ALOGD("Tethering services stopped");
San Mehat9d10b342010-01-18 09:51:02 -0800207 return 0;
208}
Matthew Xie19944102012-07-12 16:42:07 -0700209
San Mehat9d10b342010-01-18 09:51:02 -0800210bool TetherController::isTetheringStarted() {
211 return (mDaemonPid == 0 ? false : true);
212}
213
Kenny Rootcf52faf2010-02-18 09:59:55 -0800214#define MAX_CMD_SIZE 1024
215
San Mehat9d10b342010-01-18 09:51:02 -0800216int TetherController::setDnsForwarders(char **servers, int numServers) {
217 int i;
Kenny Rootcf52faf2010-02-18 09:59:55 -0800218 char daemonCmd[MAX_CMD_SIZE];
San Mehat9d10b342010-01-18 09:51:02 -0800219
220 strcpy(daemonCmd, "update_dns");
Kenny Rootcf52faf2010-02-18 09:59:55 -0800221 int cmdLen = strlen(daemonCmd);
San Mehat9d10b342010-01-18 09:51:02 -0800222
223 mDnsForwarders->clear();
224 for (i = 0; i < numServers; i++) {
Steve Block7b984e32011-12-20 16:22:42 +0000225 ALOGD("setDnsForwarders(%d = '%s')", i, servers[i]);
San Mehat9d10b342010-01-18 09:51:02 -0800226
227 struct in_addr a;
228
229 if (!inet_aton(servers[i], &a)) {
Steve Block5ea0c052012-01-06 19:18:11 +0000230 ALOGE("Failed to parse DNS server '%s'", servers[i]);
San Mehat9d10b342010-01-18 09:51:02 -0800231 mDnsForwarders->clear();
232 return -1;
233 }
Kenny Rootcf52faf2010-02-18 09:59:55 -0800234
Nick Kralevichad5b41f2012-07-19 18:48:05 -0700235 cmdLen += (strlen(servers[i]) + 1);
236 if (cmdLen + 1 >= MAX_CMD_SIZE) {
Steve Block7b984e32011-12-20 16:22:42 +0000237 ALOGD("Too many DNS servers listed");
Kenny Rootcf52faf2010-02-18 09:59:55 -0800238 break;
239 }
240
San Mehat9d10b342010-01-18 09:51:02 -0800241 strcat(daemonCmd, ":");
242 strcat(daemonCmd, servers[i]);
243 mDnsForwarders->push_back(a);
244 }
245
246 if (mDaemonFd != -1) {
Steve Block7b984e32011-12-20 16:22:42 +0000247 ALOGD("Sending update msg to dnsmasq [%s]", daemonCmd);
San Mehat9d10b342010-01-18 09:51:02 -0800248 if (write(mDaemonFd, daemonCmd, strlen(daemonCmd) +1) < 0) {
Steve Block5ea0c052012-01-06 19:18:11 +0000249 ALOGE("Failed to send update command to dnsmasq (%s)", strerror(errno));
San Mehat9d10b342010-01-18 09:51:02 -0800250 mDnsForwarders->clear();
251 return -1;
252 }
253 }
254 return 0;
255}
256
257NetAddressCollection *TetherController::getDnsForwarders() {
258 return mDnsForwarders;
259}
260
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800261int TetherController::applyDnsInterfaces() {
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800262 char daemonCmd[MAX_CMD_SIZE];
263
264 strcpy(daemonCmd, "update_ifaces");
265 int cmdLen = strlen(daemonCmd);
266 InterfaceCollection::iterator it;
267 bool haveInterfaces = false;
268
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");
273 break;
274 }
275
276 strcat(daemonCmd, ":");
277 strcat(daemonCmd, *it);
278 haveInterfaces = true;
279 }
280
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));
285 return -1;
286 }
287 }
San Mehat9d10b342010-01-18 09:51:02 -0800288 return 0;
289}
290
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800291int TetherController::tetherInterface(const char *interface) {
292 ALOGD("tetherInterface(%s)", interface);
JP Abgrall69261cb2014-06-19 18:35:24 -0700293 if (!isIfaceName(interface)) {
294 errno = ENOENT;
295 return -1;
296 }
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800297 mInterfaces->push_back(strdup(interface));
298
299 if (applyDnsInterfaces()) {
300 InterfaceCollection::iterator it;
301 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
302 if (!strcmp(interface, *it)) {
303 free(*it);
304 mInterfaces->erase(it);
305 break;
306 }
307 }
308 return -1;
309 } else {
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700310 if (isTetheringStarted()) {
311 unsigned netId = mNetworkController->getNetIdForLocalNetwork();
312 return mNetworkController->addInterfaceToNetwork(netId, interface);
313 }
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800314 return 0;
315 }
316}
317
San Mehat9d10b342010-01-18 09:51:02 -0800318int TetherController::untetherInterface(const char *interface) {
319 InterfaceCollection::iterator it;
320
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800321 ALOGD("untetherInterface(%s)", interface);
322
Sreeram Ramachandran6a773532014-07-11 09:10:20 -0700323 if (isTetheringStarted()) {
324 unsigned netId = mNetworkController->getNetIdForLocalNetwork();
325 // Ignore any error.
326 (void) mNetworkController->removeInterfaceFromNetwork(netId, interface);
327 }
328
San Mehat9d10b342010-01-18 09:51:02 -0800329 for (it = mInterfaces->begin(); it != mInterfaces->end(); ++it) {
330 if (!strcmp(interface, *it)) {
331 free(*it);
332 mInterfaces->erase(it);
Robert Greenwalt3d4c7582012-12-11 12:33:37 -0800333
334 return applyDnsInterfaces();
San Mehat9d10b342010-01-18 09:51:02 -0800335 }
336 }
337 errno = ENOENT;
338 return -1;
339}
340
341InterfaceCollection *TetherController::getTetheredInterfaceList() {
342 return mInterfaces;
343}