android_net_NetUtils.cpp revision d713683f9f5230d6a234ce8efbaf3c0959b81e22 
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    jmethodID constructorId;
69    jfieldID ipaddress;
70    jfieldID gateway;
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) {
183        env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
184        env->SetObjectField(info, dhcpInfoInternalFieldIds.gateway, env->NewStringUTF(gateway));
185        env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength);
186        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1));
187        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2));
188        env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress,
189                env->NewStringUTF(server));
190        env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease);
191    }
192    return (jboolean)(result == 0);
193}
194
195static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
196{
197    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
198}
199
200static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
201{
202    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
203}
204
205
206static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
207{
208    int result;
209
210    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
211    result = ::dhcp_stop(nameStr);
212    env->ReleaseStringUTFChars(ifname, nameStr);
213    return (jboolean)(result == 0);
214}
215
216static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
217{
218    int result;
219
220    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
221    result = ::dhcp_release_lease(nameStr);
222    env->ReleaseStringUTFChars(ifname, nameStr);
223    return (jboolean)(result == 0);
224}
225
226static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
227{
228    return env->NewStringUTF(::dhcp_get_errmsg());
229}
230
231// ----------------------------------------------------------------------------
232
233/*
234 * JNI registration.
235 */
236static JNINativeMethod gNetworkUtilMethods[] = {
237    /* name, signature, funcPtr */
238
239    { "enableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_enableInterface },
240    { "disableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_disableInterface },
241    { "addRoute", "(Ljava/lang/String;Ljava/lang/String;ILjava/lang/String;)I",
242       (void *)android_net_utils_addRoute },
243    { "removeHostRoutes", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeHostRoutes },
244    { "getDefaultRouteNative", "(Ljava/lang/String;)I",
245       (void *)android_net_utils_getDefaultRoute },
246    { "removeDefaultRoute", "(Ljava/lang/String;)I",  (void *)android_net_utils_removeDefaultRoute },
247    { "resetConnections", "(Ljava/lang/String;)I",  (void *)android_net_utils_resetConnections },
248    { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
249    { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcpRenew },
250    { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
251    { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
252    { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
253};
254
255int register_android_net_NetworkUtils(JNIEnv* env)
256{
257    jclass dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal");
258    LOG_FATAL_IF(dhcpInfoInternalClass == NULL, "Unable to find class android/net/DhcpInfoInternal");
259    dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalClass, "<init>", "()V");
260    dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;");
261    dhcpInfoInternalFieldIds.gateway = env->GetFieldID(dhcpInfoInternalClass, "gateway", "Ljava/lang/String;");
262    dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalClass, "prefixLength", "I");
263    dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalClass, "dns1", "Ljava/lang/String;");
264    dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalClass, "dns2", "Ljava/lang/String;");
265    dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;");
266    dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalClass, "leaseDuration", "I");
267
268    return AndroidRuntime::registerNativeMethods(env,
269            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
270}
271
272}; // namespace android
273