android_net_NetUtils.cpp revision aa70f101e08098ed9cb190abe2d7f952561026b8 
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);
43int dhcp_stop(const char *ifname);
44int dhcp_release_lease(const char *ifname);
45char *dhcp_get_errmsg();
46}
47
48#define NETUTILS_PKG_NAME "android/net/NetworkUtils"
49
50namespace android {
51
52/*
53 * The following remembers the jfieldID's of the fields
54 * of the DhcpInfo Java object, so that we don't have
55 * to look them up every time.
56 */
57static struct fieldIds {
58    jclass dhcpInfoInternalClass;
59    jmethodID constructorId;
60    jfieldID ipaddress;
61    jfieldID prefixLength;
62    jfieldID dns1;
63    jfieldID dns2;
64    jfieldID serverAddress;
65    jfieldID leaseDuration;
66} dhcpInfoInternalFieldIds;
67
68static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname)
69{
70    int result;
71
72    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
73    result = ::ifc_enable(nameStr);
74    env->ReleaseStringUTFChars(ifname, nameStr);
75    return (jint)result;
76}
77
78static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname)
79{
80    int result;
81
82    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
83    result = ::ifc_disable(nameStr);
84    env->ReleaseStringUTFChars(ifname, nameStr);
85    return (jint)result;
86}
87
88static jint android_net_utils_addRoute(JNIEnv* env, jobject clazz, jstring ifname,
89          jstring dst, jint prefixLength, jstring gw)
90{
91    int result;
92
93    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
94    const char *dstStr = env->GetStringUTFChars(dst, NULL);
95    const char *gwStr = NULL;
96    if (gw != NULL) {
97        gwStr = env->GetStringUTFChars(gw, NULL);
98    }
99    result = ::ifc_add_route(nameStr, dstStr, prefixLength, gwStr);
100    env->ReleaseStringUTFChars(ifname, nameStr);
101    env->ReleaseStringUTFChars(dst, dstStr);
102    if (gw != NULL) {
103        env->ReleaseStringUTFChars(gw, gwStr);
104    }
105    return (jint)result;
106}
107
108static jint android_net_utils_removeHostRoutes(JNIEnv* env, jobject clazz, jstring ifname)
109{
110    int result;
111
112    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
113    result = ::ifc_remove_host_routes(nameStr);
114    env->ReleaseStringUTFChars(ifname, nameStr);
115    return (jint)result;
116}
117
118static jint android_net_utils_getDefaultRoute(JNIEnv* env, jobject clazz, jstring ifname)
119{
120    int result;
121
122    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
123    result = ::ifc_get_default_route(nameStr);
124    env->ReleaseStringUTFChars(ifname, nameStr);
125    return (jint)result;
126}
127
128static jint android_net_utils_removeDefaultRoute(JNIEnv* env, jobject clazz, jstring ifname)
129{
130    int result;
131
132    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
133    result = ::ifc_remove_default_route(nameStr);
134    env->ReleaseStringUTFChars(ifname, nameStr);
135    return (jint)result;
136}
137
138static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, jstring ifname)
139{
140    int result;
141
142    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
143    result = ::ifc_reset_connections(nameStr);
144    env->ReleaseStringUTFChars(ifname, nameStr);
145    return (jint)result;
146}
147
148static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
149{
150    int result;
151    char  ipaddr[PROPERTY_VALUE_MAX];
152    uint32_t prefixLength;
153    char gateway[PROPERTY_VALUE_MAX];
154    char    dns1[PROPERTY_VALUE_MAX];
155    char    dns2[PROPERTY_VALUE_MAX];
156    char  server[PROPERTY_VALUE_MAX];
157    uint32_t lease;
158
159    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
160    if (nameStr == NULL) return (jboolean)false;
161
162    result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
163                                        dns1, dns2, server, &lease);
164    env->ReleaseStringUTFChars(ifname, nameStr);
165    if (result == 0 && dhcpInfoInternalFieldIds.dhcpInfoInternalClass != NULL) {
166        env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
167
168        // set the gateway
169        jclass cls = env->FindClass("java/net/InetAddress");
170        jmethodID method = env->GetStaticMethodID(cls, "getByName",
171                "(Ljava/lang/String;)Ljava/net/InetAddress;");
172        jvalue args[1];
173        args[0].l = env->NewStringUTF(gateway);
174        jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args);
175
176        if (!env->ExceptionOccurred()) {
177            cls = env->FindClass("android/net/RouteInfo");
178            method = env->GetMethodID(cls, "<init>", "(Ljava/net/InetAddress;)V");
179            args[0].l = inetAddressObject;
180            jobject routeInfoObject = env->NewObjectA(cls, method, args);
181
182            cls = env->FindClass("android/net/DhcpInfoInternal");
183            method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V");
184            args[0].l = routeInfoObject;
185            env->CallVoidMethodA(info, method, args);
186        } else {
187            // if we have an exception (host not found perhaps), just don't add the route
188            env->ExceptionClear();
189        }
190
191        env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength);
192        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1));
193        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2));
194        env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress,
195                env->NewStringUTF(server));
196        env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease);
197    }
198    return (jboolean)(result == 0);
199}
200
201static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
202{
203    int result;
204
205    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
206    result = ::dhcp_stop(nameStr);
207    env->ReleaseStringUTFChars(ifname, nameStr);
208    return (jboolean)(result == 0);
209}
210
211static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
212{
213    int result;
214
215    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
216    result = ::dhcp_release_lease(nameStr);
217    env->ReleaseStringUTFChars(ifname, nameStr);
218    return (jboolean)(result == 0);
219}
220
221static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
222{
223    return env->NewStringUTF(::dhcp_get_errmsg());
224}
225
226// ----------------------------------------------------------------------------
227
228/*
229 * JNI registration.
230 */
231static JNINativeMethod gNetworkUtilMethods[] = {
232    /* name, signature, funcPtr */
233
234    { "enableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_enableInterface },
235    { "disableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_disableInterface },
236    { "addRoute", "(Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;)I",
237       (void *)android_net_utils_addRoute },
238    { "removeHostRoutes", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeHostRoutes },
239    { "getDefaultRouteNative", "(Ljava/lang/String;)I",
240       (void *)android_net_utils_getDefaultRoute },
241    { "removeDefaultRoute", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeDefaultRoute },
242    { "resetConnections", "(Ljava/lang/String;)I",  (void *)android_net_utils_resetConnections },
243    { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
244    { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
245    { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
246    { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
247};
248
249int register_android_net_NetworkUtils(JNIEnv* env)
250{
251    jclass netutils = env->FindClass(NETUTILS_PKG_NAME);
252    LOG_FATAL_IF(netutils == NULL, "Unable to find class " NETUTILS_PKG_NAME);
253
254    dhcpInfoInternalFieldIds.dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal");
255    if (dhcpInfoInternalFieldIds.dhcpInfoInternalClass != NULL) {
256        dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "<init>", "()V");
257        dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;");
258        dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "prefixLength", "I");
259        dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "dns1", "Ljava/lang/String;");
260        dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "dns2", "Ljava/lang/String;");
261        dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;");
262        dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalFieldIds.dhcpInfoInternalClass, "leaseDuration", "I");
263    }
264
265    return AndroidRuntime::registerNativeMethods(env,
266            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
267}
268
269}; // namespace android
270