1 /*
2 * Copyright 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 #define LOG_TAG "NetUtils"
18
19 #include "jni.h"
20 #include "JNIHelp.h"
21 #include "NetdClient.h"
22 #include "resolv_netid.h"
23 #include <utils/misc.h>
24 #include <android_runtime/AndroidRuntime.h>
25 #include <utils/Log.h>
26 #include <arpa/inet.h>
27 #include <cutils/properties.h>
28
29 extern "C" {
30 int ifc_enable(const char *ifname);
31 int ifc_disable(const char *ifname);
32 int ifc_reset_connections(const char *ifname, int reset_mask);
33
34 int dhcp_do_request(const char * const ifname,
35 const char *ipaddr,
36 const char *gateway,
37 uint32_t *prefixLength,
38 const char *dns[],
39 const char *server,
40 uint32_t *lease,
41 const char *vendorInfo,
42 const char *domains,
43 const char *mtu);
44
45 int dhcp_do_request_renew(const char * const ifname,
46 const char *ipaddr,
47 const char *gateway,
48 uint32_t *prefixLength,
49 const char *dns[],
50 const char *server,
51 uint32_t *lease,
52 const char *vendorInfo,
53 const char *domains,
54 const char *mtu);
55
56 int dhcp_stop(const char *ifname);
57 int dhcp_release_lease(const char *ifname);
58 char *dhcp_get_errmsg();
59 }
60
61 #define NETUTILS_PKG_NAME "android/net/NetworkUtils"
62
63 namespace android {
64
65 /*
66 * The following remembers the jfieldID's of the fields
67 * of the DhcpInfo Java object, so that we don't have
68 * to look them up every time.
69 */
70 static struct fieldIds {
71 jmethodID clear;
72 jmethodID setIpAddress;
73 jmethodID setGateway;
74 jmethodID addDns;
75 jmethodID setDomains;
76 jmethodID setServerAddress;
77 jmethodID setLeaseDuration;
78 jmethodID setVendorInfo;
79 } dhcpResultsFieldIds;
80
android_net_utils_resetConnections(JNIEnv * env,jobject clazz,jstring ifname,jint mask)81 static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz,
82 jstring ifname, jint mask)
83 {
84 int result;
85
86 const char *nameStr = env->GetStringUTFChars(ifname, NULL);
87
88 ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n",
89 env, clazz, nameStr, mask);
90
91 result = ::ifc_reset_connections(nameStr, mask);
92 env->ReleaseStringUTFChars(ifname, nameStr);
93 return (jint)result;
94 }
95
android_net_utils_runDhcpCommon(JNIEnv * env,jobject clazz,jstring ifname,jobject dhcpResults,bool renew)96 static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname,
97 jobject dhcpResults, bool renew)
98 {
99 int result;
100 char ipaddr[PROPERTY_VALUE_MAX];
101 uint32_t prefixLength;
102 char gateway[PROPERTY_VALUE_MAX];
103 char dns1[PROPERTY_VALUE_MAX];
104 char dns2[PROPERTY_VALUE_MAX];
105 char dns3[PROPERTY_VALUE_MAX];
106 char dns4[PROPERTY_VALUE_MAX];
107 const char *dns[5] = {dns1, dns2, dns3, dns4, NULL};
108 char server[PROPERTY_VALUE_MAX];
109 uint32_t lease;
110 char vendorInfo[PROPERTY_VALUE_MAX];
111 char domains[PROPERTY_VALUE_MAX];
112 char mtu[PROPERTY_VALUE_MAX];
113
114 const char *nameStr = env->GetStringUTFChars(ifname, NULL);
115 if (nameStr == NULL) return (jboolean)false;
116
117 if (renew) {
118 result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength,
119 dns, server, &lease, vendorInfo, domains, mtu);
120 } else {
121 result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
122 dns, server, &lease, vendorInfo, domains, mtu);
123 }
124 if (result != 0) {
125 ALOGD("dhcp_do_request failed : %s (%s)", nameStr, renew ? "renew" : "new");
126 }
127
128 env->ReleaseStringUTFChars(ifname, nameStr);
129 if (result == 0) {
130 env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.clear);
131
132 // set the linkAddress
133 // dhcpResults->addLinkAddress(inetAddress, prefixLength)
134 result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setIpAddress,
135 env->NewStringUTF(ipaddr), prefixLength);
136 }
137
138 if (result == 0) {
139 // set the gateway
140 result = env->CallBooleanMethod(dhcpResults,
141 dhcpResultsFieldIds.setGateway, env->NewStringUTF(gateway));
142 }
143
144 if (result == 0) {
145 // dhcpResults->addDns(new InetAddress(dns1))
146 result = env->CallBooleanMethod(dhcpResults,
147 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns1));
148 }
149
150 if (result == 0) {
151 env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setDomains,
152 env->NewStringUTF(domains));
153
154 result = env->CallBooleanMethod(dhcpResults,
155 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns2));
156
157 if (result == 0) {
158 result = env->CallBooleanMethod(dhcpResults,
159 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns3));
160 if (result == 0) {
161 result = env->CallBooleanMethod(dhcpResults,
162 dhcpResultsFieldIds.addDns, env->NewStringUTF(dns4));
163 }
164 }
165 }
166
167 if (result == 0) {
168 // dhcpResults->setServerAddress(new InetAddress(server))
169 result = env->CallBooleanMethod(dhcpResults, dhcpResultsFieldIds.setServerAddress,
170 env->NewStringUTF(server));
171 }
172
173 if (result == 0) {
174 // dhcpResults->setLeaseDuration(lease)
175 env->CallVoidMethod(dhcpResults,
176 dhcpResultsFieldIds.setLeaseDuration, lease);
177
178 // dhcpResults->setVendorInfo(vendorInfo)
179 env->CallVoidMethod(dhcpResults, dhcpResultsFieldIds.setVendorInfo,
180 env->NewStringUTF(vendorInfo));
181 }
182 return (jboolean)(result == 0);
183 }
184
185
android_net_utils_runDhcp(JNIEnv * env,jobject clazz,jstring ifname,jobject info)186 static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
187 {
188 return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
189 }
190
android_net_utils_runDhcpRenew(JNIEnv * env,jobject clazz,jstring ifname,jobject info)191 static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname,
192 jobject info)
193 {
194 return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
195 }
196
197
android_net_utils_stopDhcp(JNIEnv * env,jobject clazz,jstring ifname)198 static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
199 {
200 int result;
201
202 const char *nameStr = env->GetStringUTFChars(ifname, NULL);
203 result = ::dhcp_stop(nameStr);
204 env->ReleaseStringUTFChars(ifname, nameStr);
205 return (jboolean)(result == 0);
206 }
207
android_net_utils_releaseDhcpLease(JNIEnv * env,jobject clazz,jstring ifname)208 static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
209 {
210 int result;
211
212 const char *nameStr = env->GetStringUTFChars(ifname, NULL);
213 result = ::dhcp_release_lease(nameStr);
214 env->ReleaseStringUTFChars(ifname, nameStr);
215 return (jboolean)(result == 0);
216 }
217
android_net_utils_getDhcpError(JNIEnv * env,jobject clazz)218 static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
219 {
220 return env->NewStringUTF(::dhcp_get_errmsg());
221 }
222
android_net_utils_bindProcessToNetwork(JNIEnv * env,jobject thiz,jint netId)223 static jboolean android_net_utils_bindProcessToNetwork(JNIEnv *env, jobject thiz, jint netId)
224 {
225 return (jboolean) !setNetworkForProcess(netId);
226 }
227
android_net_utils_getNetworkBoundToProcess(JNIEnv * env,jobject thiz)228 static jint android_net_utils_getNetworkBoundToProcess(JNIEnv *env, jobject thiz)
229 {
230 return getNetworkForProcess();
231 }
232
android_net_utils_bindProcessToNetworkForHostResolution(JNIEnv * env,jobject thiz,jint netId)233 static jboolean android_net_utils_bindProcessToNetworkForHostResolution(JNIEnv *env, jobject thiz,
234 jint netId)
235 {
236 return (jboolean) !setNetworkForResolv(netId);
237 }
238
android_net_utils_bindSocketToNetwork(JNIEnv * env,jobject thiz,jint socket,jint netId)239 static jint android_net_utils_bindSocketToNetwork(JNIEnv *env, jobject thiz, jint socket,
240 jint netId)
241 {
242 return setNetworkForSocket(netId, socket);
243 }
244
android_net_utils_protectFromVpn(JNIEnv * env,jobject thiz,jint socket)245 static jboolean android_net_utils_protectFromVpn(JNIEnv *env, jobject thiz, jint socket)
246 {
247 return (jboolean) !protectFromVpn(socket);
248 }
249
250 // ----------------------------------------------------------------------------
251
252 /*
253 * JNI registration.
254 */
255 static JNINativeMethod gNetworkUtilMethods[] = {
256 /* name, signature, funcPtr */
257 { "resetConnections", "(Ljava/lang/String;I)I", (void *)android_net_utils_resetConnections },
258 { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpResults;)Z", (void *)android_net_utils_runDhcp },
259 { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpResults;)Z", (void *)android_net_utils_runDhcpRenew },
260 { "stopDhcp", "(Ljava/lang/String;)Z", (void *)android_net_utils_stopDhcp },
261 { "releaseDhcpLease", "(Ljava/lang/String;)Z", (void *)android_net_utils_releaseDhcpLease },
262 { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
263 { "bindProcessToNetwork", "(I)Z", (void*) android_net_utils_bindProcessToNetwork },
264 { "getNetworkBoundToProcess", "()I", (void*) android_net_utils_getNetworkBoundToProcess },
265 { "bindProcessToNetworkForHostResolution", "(I)Z", (void*) android_net_utils_bindProcessToNetworkForHostResolution },
266 { "bindSocketToNetwork", "(II)I", (void*) android_net_utils_bindSocketToNetwork },
267 { "protectFromVpn", "(I)Z", (void*)android_net_utils_protectFromVpn },
268 };
269
register_android_net_NetworkUtils(JNIEnv * env)270 int register_android_net_NetworkUtils(JNIEnv* env)
271 {
272 jclass dhcpResultsClass = env->FindClass("android/net/DhcpResults");
273 LOG_FATAL_IF(dhcpResultsClass == NULL, "Unable to find class android/net/DhcpResults");
274 dhcpResultsFieldIds.clear =
275 env->GetMethodID(dhcpResultsClass, "clear", "()V");
276 dhcpResultsFieldIds.setIpAddress =
277 env->GetMethodID(dhcpResultsClass, "setIpAddress", "(Ljava/lang/String;I)Z");
278 dhcpResultsFieldIds.setGateway =
279 env->GetMethodID(dhcpResultsClass, "setGateway", "(Ljava/lang/String;)Z");
280 dhcpResultsFieldIds.addDns =
281 env->GetMethodID(dhcpResultsClass, "addDns", "(Ljava/lang/String;)Z");
282 dhcpResultsFieldIds.setDomains =
283 env->GetMethodID(dhcpResultsClass, "setDomains", "(Ljava/lang/String;)V");
284 dhcpResultsFieldIds.setServerAddress =
285 env->GetMethodID(dhcpResultsClass, "setServerAddress", "(Ljava/lang/String;)Z");
286 dhcpResultsFieldIds.setLeaseDuration =
287 env->GetMethodID(dhcpResultsClass, "setLeaseDuration", "(I)V");
288 dhcpResultsFieldIds.setVendorInfo =
289 env->GetMethodID(dhcpResultsClass, "setVendorInfo", "(Ljava/lang/String;)V");
290
291 return AndroidRuntime::registerNativeMethods(env,
292 NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
293 }
294
295 }; // namespace android
296