android_net_NetUtils.cpp revision ae367419df6e5f55b081fa793b535cc84b55d6ed 
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_reset_connections(const char *ifname, int reset_mask);
30
31int dhcp_do_request(const char *ifname,
32                    const char *ipaddr,
33                    const char *gateway,
34                    uint32_t  *prefixLength,
35                    const char *dns1,
36                    const char *dns2,
37                    const char *server,
38                    uint32_t  *lease);
39
40int dhcp_do_request_renew(const char *ifname,
41                    const char *ipaddr,
42                    const char *gateway,
43                    uint32_t  *prefixLength,
44                    const char *dns1,
45                    const char *dns2,
46                    const char *server,
47                    uint32_t  *lease);
48
49int dhcp_stop(const char *ifname);
50int dhcp_release_lease(const char *ifname);
51char *dhcp_get_errmsg();
52}
53
54#define NETUTILS_PKG_NAME "android/net/NetworkUtils"
55
56namespace android {
57
58/*
59 * The following remembers the jfieldID's of the fields
60 * of the DhcpInfo Java object, so that we don't have
61 * to look them up every time.
62 */
63static struct fieldIds {
64    jmethodID constructorId;
65    jfieldID ipaddress;
66    jfieldID prefixLength;
67    jfieldID dns1;
68    jfieldID dns2;
69    jfieldID serverAddress;
70    jfieldID leaseDuration;
71} dhcpInfoInternalFieldIds;
72
73static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname)
74{
75    int result;
76
77    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
78    result = ::ifc_enable(nameStr);
79    env->ReleaseStringUTFChars(ifname, nameStr);
80    return (jint)result;
81}
82
83static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname)
84{
85    int result;
86
87    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
88    result = ::ifc_disable(nameStr);
89    env->ReleaseStringUTFChars(ifname, nameStr);
90    return (jint)result;
91}
92
93static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz,
94      jstring ifname, jint mask)
95{
96    int result;
97
98    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
99
100    LOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n",
101          env, clazz, nameStr, mask);
102
103    result = ::ifc_reset_connections(nameStr, mask);
104    env->ReleaseStringUTFChars(ifname, nameStr);
105    return (jint)result;
106}
107
108static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname,
109        jobject info, bool renew)
110{
111    int result;
112    char  ipaddr[PROPERTY_VALUE_MAX];
113    uint32_t prefixLength;
114    char gateway[PROPERTY_VALUE_MAX];
115    char    dns1[PROPERTY_VALUE_MAX];
116    char    dns2[PROPERTY_VALUE_MAX];
117    char  server[PROPERTY_VALUE_MAX];
118    uint32_t lease;
119
120    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
121    if (nameStr == NULL) return (jboolean)false;
122
123    if (renew) {
124        result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength,
125                dns1, dns2, server, &lease);
126    } else {
127        result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
128                dns1, dns2, server, &lease);
129    }
130
131    env->ReleaseStringUTFChars(ifname, nameStr);
132    if (result == 0) {
133        env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
134
135        // set the gateway
136        jclass cls = env->FindClass("java/net/InetAddress");
137        jmethodID method = env->GetStaticMethodID(cls, "getByName",
138                "(Ljava/lang/String;)Ljava/net/InetAddress;");
139        jvalue args[1];
140        args[0].l = env->NewStringUTF(gateway);
141        jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args);
142
143        if (!env->ExceptionOccurred()) {
144            cls = env->FindClass("android/net/RouteInfo");
145            method = env->GetMethodID(cls, "<init>", "(Ljava/net/InetAddress;)V");
146            args[0].l = inetAddressObject;
147            jobject routeInfoObject = env->NewObjectA(cls, method, args);
148
149            cls = env->FindClass("android/net/DhcpInfoInternal");
150            method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V");
151            args[0].l = routeInfoObject;
152            env->CallVoidMethodA(info, method, args);
153        } else {
154            // if we have an exception (host not found perhaps), just don't add the route
155            env->ExceptionClear();
156        }
157
158        env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength);
159        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1));
160        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2));
161        env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress,
162                env->NewStringUTF(server));
163        env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease);
164    }
165    return (jboolean)(result == 0);
166}
167
168static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
169{
170    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
171}
172
173static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
174{
175    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
176}
177
178
179static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
180{
181    int result;
182
183    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
184    result = ::dhcp_stop(nameStr);
185    env->ReleaseStringUTFChars(ifname, nameStr);
186    return (jboolean)(result == 0);
187}
188
189static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
190{
191    int result;
192
193    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
194    result = ::dhcp_release_lease(nameStr);
195    env->ReleaseStringUTFChars(ifname, nameStr);
196    return (jboolean)(result == 0);
197}
198
199static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
200{
201    return env->NewStringUTF(::dhcp_get_errmsg());
202}
203
204// ----------------------------------------------------------------------------
205
206/*
207 * JNI registration.
208 */
209static JNINativeMethod gNetworkUtilMethods[] = {
210    /* name, signature, funcPtr */
211
212    { "enableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_enableInterface },
213    { "disableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_disableInterface },
214    { "resetConnections", "(Ljava/lang/String;I)I",  (void *)android_net_utils_resetConnections },
215    { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
216    { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcpRenew },
217    { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
218    { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
219    { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
220};
221
222int register_android_net_NetworkUtils(JNIEnv* env)
223{
224    jclass dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal");
225    LOG_FATAL_IF(dhcpInfoInternalClass == NULL, "Unable to find class android/net/DhcpInfoInternal");
226    dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalClass, "<init>", "()V");
227    dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;");
228    dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalClass, "prefixLength", "I");
229    dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalClass, "dns1", "Ljava/lang/String;");
230    dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalClass, "dns2", "Ljava/lang/String;");
231    dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;");
232    dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalClass, "leaseDuration", "I");
233
234    return AndroidRuntime::registerNativeMethods(env,
235            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
236}
237
238}; // namespace android
239