android_net_NetUtils.cpp revision a47c40193fcbe9ca07facea78b2828afdae5e025 
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 <utils/misc.h>
21#include <android_runtime/AndroidRuntime.h>
22#include <utils/Log.h>
23#include <arpa/inet.h>
24#include <cutils/properties.h>
25
26extern "C" {
27int ifc_enable(const char *ifname);
28int ifc_disable(const char *ifname);
29int ifc_add_route(const char *ifname, const char *destStr, uint32_t prefixLen, const char *gwStr);
30int ifc_remove_host_routes(const char *ifname);
31int ifc_get_default_route(const char *ifname);
32int ifc_remove_default_route(const char *ifname);
33int ifc_reset_connections(const char *ifname);
34
35int dhcp_do_request(const char *ifname,
36                    const char *ipaddr,
37                    const char *gateway,
38                    uint32_t  *prefixLength,
39                    const char *dns1,
40                    const char *dns2,
41                    const char *server,
42                    uint32_t  *lease);
43
44int dhcp_do_request_renew(const char *ifname,
45                    const char *ipaddr,
46                    const char *gateway,
47                    uint32_t  *prefixLength,
48                    const char *dns1,
49                    const char *dns2,
50                    const char *server,
51                    uint32_t  *lease);
52
53int dhcp_stop(const char *ifname);
54int dhcp_release_lease(const char *ifname);
55char *dhcp_get_errmsg();
56}
57
58#define NETUTILS_PKG_NAME "android/net/NetworkUtils"
59
60namespace android {
61
62/*
63 * The following remembers the jfieldID's of the fields
64 * of the DhcpInfo Java object, so that we don't have
65 * to look them up every time.
66 */
67static struct fieldIds {
68    jclass dhcpInfoInternalClass;
69    jmethodID constructorId;
70    jfieldID ipaddress;
71    jfieldID prefixLength;
72    jfieldID dns1;
73    jfieldID dns2;
74    jfieldID serverAddress;
75    jfieldID leaseDuration;
76} dhcpInfoInternalFieldIds;
77
78static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname)
79{
80    int result;
81
82    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
83    result = ::ifc_enable(nameStr);
84    env->ReleaseStringUTFChars(ifname, nameStr);
85    return (jint)result;
86}
87
88static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname)
89{
90    int result;
91
92    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
93    result = ::ifc_disable(nameStr);
94    env->ReleaseStringUTFChars(ifname, nameStr);
95    return (jint)result;
96}
97
98static jint android_net_utils_addRoute(JNIEnv* env, jobject clazz, jstring ifname,
99          jstring dst, jint prefixLength, jstring gw)
100{
101    int result;
102
103    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
104    const char *dstStr = env->GetStringUTFChars(dst, NULL);
105    const char *gwStr = NULL;
106    if (gw != NULL) {
107        gwStr = env->GetStringUTFChars(gw, NULL);
108    }
109    result = ::ifc_add_route(nameStr, dstStr, prefixLength, gwStr);
110    env->ReleaseStringUTFChars(ifname, nameStr);
111    env->ReleaseStringUTFChars(dst, dstStr);
112    if (gw != NULL) {
113        env->ReleaseStringUTFChars(gw, gwStr);
114    }
115    return (jint)result;
116}
117
118static jint android_net_utils_removeHostRoutes(JNIEnv* env, jobject clazz, jstring ifname)
119{
120    int result;
121
122    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
123    result = ::ifc_remove_host_routes(nameStr);
124    env->ReleaseStringUTFChars(ifname, nameStr);
125    return (jint)result;
126}
127
128static jint android_net_utils_getDefaultRoute(JNIEnv* env, jobject clazz, jstring ifname)
129{
130    int result;
131
132    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
133    result = ::ifc_get_default_route(nameStr);
134    env->ReleaseStringUTFChars(ifname, nameStr);
135    return (jint)result;
136}
137
138static jint android_net_utils_removeDefaultRoute(JNIEnv* env, jobject clazz, jstring ifname)
139{
140    int result;
141
142    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
143    result = ::ifc_remove_default_route(nameStr);
144    env->ReleaseStringUTFChars(ifname, nameStr);
145    return (jint)result;
146}
147
148static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, jstring ifname)
149{
150    int result;
151
152    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
153    result = ::ifc_reset_connections(nameStr);
154    env->ReleaseStringUTFChars(ifname, nameStr);
155    return (jint)result;
156}
157
158static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname,
159        jobject info, bool renew)
160{
161    int result;
162    char  ipaddr[PROPERTY_VALUE_MAX];
163    uint32_t prefixLength;
164    char gateway[PROPERTY_VALUE_MAX];
165    char    dns1[PROPERTY_VALUE_MAX];
166    char    dns2[PROPERTY_VALUE_MAX];
167    char  server[PROPERTY_VALUE_MAX];
168    uint32_t lease;
169
170    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
171    if (nameStr == NULL) return (jboolean)false;
172
173    if (renew) {
174        result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength,
175                dns1, dns2, server, &lease);
176    } else {
177        result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
178                dns1, dns2, server, &lease);
179    }
180
181    env->ReleaseStringUTFChars(ifname, nameStr);
182    if (result == 0 && dhcpInfoInternalFieldIds.dhcpInfoInternalClass != NULL) {
183        env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
184
185        // set the gateway
186        jclass cls = env->FindClass("java/net/InetAddress");
187        jmethodID method = env->GetStaticMethodID(cls, "getByName",
188                "(Ljava/lang/String;)Ljava/net/InetAddress;");
189        jvalue args[1];
190        args[0].l = env->NewStringUTF(gateway);
191        jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args);
192
193        if (!env->ExceptionOccurred()) {
194            cls = env->FindClass("android/net/RouteInfo");
195            method = env->GetMethodID(cls, "<init>", "(Ljava/net/InetAddress;)V");
196            args[0].l = inetAddressObject;
197            jobject routeInfoObject = env->NewObjectA(cls, method, args);
198
199            cls = env->FindClass("android/net/DhcpInfoInternal");
200            method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V");
201            args[0].l = routeInfoObject;
202            env->CallVoidMethodA(info, method, args);
203        } else {
204            // if we have an exception (host not found perhaps), just don't add the route
205            env->ExceptionClear();
206        }
207
208        env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength);
209        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1));
210        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2));
211        env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress,
212                env->NewStringUTF(server));
213        env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease);
214    }
215    return (jboolean)(result == 0);
216}
217
218static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
219{
220    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
221}
222
223static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
224{
225    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
226}
227
228
229static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
230{
231    int result;
232
233    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
234    result = ::dhcp_stop(nameStr);
235    env->ReleaseStringUTFChars(ifname, nameStr);
236    return (jboolean)(result == 0);
237}
238
239static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
240{
241    int result;
242
243    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
244    result = ::dhcp_release_lease(nameStr);
245    env->ReleaseStringUTFChars(ifname, nameStr);
246    return (jboolean)(result == 0);
247}
248
249static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
250{
251    return env->NewStringUTF(::dhcp_get_errmsg());
252}
253
254// ----------------------------------------------------------------------------
255
256/*
257 * JNI registration.
258 */
259static JNINativeMethod gNetworkUtilMethods[] = {
260    /* name, signature, funcPtr */
261
262    { "enableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_enableInterface },
263    { "disableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_disableInterface },
264    { "addRoute", "(Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;)I",
265       (void *)android_net_utils_addRoute },
266    { "removeHostRoutes", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeHostRoutes },
267    { "getDefaultRouteNative", "(Ljava/lang/String;)I",
268       (void *)android_net_utils_getDefaultRoute },
269    { "removeDefaultRoute", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeDefaultRoute },
270    { "resetConnections", "(Ljava/lang/String;)I",  (void *)android_net_utils_resetConnections },
271    { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
272    { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcpRenew },
273    { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
274    { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
275    { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
276};
277
278int register_android_net_NetworkUtils(JNIEnv* env)
279{
280    jclass netutils = env->FindClass(NETUTILS_PKG_NAME);
281    LOG_FATAL_IF(netutils == NULL, "Unable to find class " NETUTILS_PKG_NAME);
282
283    dhcpInfoInternalFieldIds.dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal");
284    if (dhcpInfoInternalFieldIds.dhcpInfoInternalClass != NULL) {
285        dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "<init>", "()V");
286        dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;");
287        dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "prefixLength", "I");
288        dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "dns1", "Ljava/lang/String;");
289        dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "dns2", "Ljava/lang/String;");
290        dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;");
291        dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "leaseDuration", "I");
292    }
293
294    return AndroidRuntime::registerNativeMethods(env,
295            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
296}
297
298}; // namespace android
299