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                    const char *vendorInfo);
40
41int dhcp_do_request_renew(const char *ifname,
42                    const char *ipaddr,
43                    const char *gateway,
44                    uint32_t *prefixLength,
45                    const char *dns1,
46                    const char *dns2,
47                    const char *server,
48                    uint32_t *lease,
49                    const char *vendorInfo);
50
51int dhcp_stop(const char *ifname);
52int dhcp_release_lease(const char *ifname);
53char *dhcp_get_errmsg();
54}
55
56#define NETUTILS_PKG_NAME "android/net/NetworkUtils"
57
58namespace android {
59
60/*
61 * The following remembers the jfieldID's of the fields
62 * of the DhcpInfo Java object, so that we don't have
63 * to look them up every time.
64 */
65static struct fieldIds {
66    jmethodID constructorId;
67    jfieldID ipaddress;
68    jfieldID prefixLength;
69    jfieldID dns1;
70    jfieldID dns2;
71    jfieldID serverAddress;
72    jfieldID leaseDuration;
73    jfieldID vendorInfo;
74} dhcpInfoInternalFieldIds;
75
76static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname)
77{
78    int result;
79
80    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
81    result = ::ifc_enable(nameStr);
82    env->ReleaseStringUTFChars(ifname, nameStr);
83    return (jint)result;
84}
85
86static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname)
87{
88    int result;
89
90    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
91    result = ::ifc_disable(nameStr);
92    env->ReleaseStringUTFChars(ifname, nameStr);
93    return (jint)result;
94}
95
96static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz,
97      jstring ifname, jint mask)
98{
99    int result;
100
101    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
102
103    ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n",
104          env, clazz, nameStr, mask);
105
106    result = ::ifc_reset_connections(nameStr, mask);
107    env->ReleaseStringUTFChars(ifname, nameStr);
108    return (jint)result;
109}
110
111static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname,
112        jobject info, bool renew)
113{
114    int result;
115    char  ipaddr[PROPERTY_VALUE_MAX];
116    uint32_t prefixLength;
117    char gateway[PROPERTY_VALUE_MAX];
118    char    dns1[PROPERTY_VALUE_MAX];
119    char    dns2[PROPERTY_VALUE_MAX];
120    char  server[PROPERTY_VALUE_MAX];
121    uint32_t lease;
122    char vendorInfo[PROPERTY_VALUE_MAX];
123
124    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
125    if (nameStr == NULL) return (jboolean)false;
126
127    if (renew) {
128        result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength,
129                dns1, dns2, server, &lease, vendorInfo);
130    } else {
131        result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength,
132                dns1, dns2, server, &lease, vendorInfo);
133    }
134
135    env->ReleaseStringUTFChars(ifname, nameStr);
136    if (result == 0) {
137        env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr));
138
139        // set the gateway
140        jclass cls = env->FindClass("java/net/InetAddress");
141        jmethodID method = env->GetStaticMethodID(cls, "getByName",
142                "(Ljava/lang/String;)Ljava/net/InetAddress;");
143        jvalue args[1];
144        args[0].l = env->NewStringUTF(gateway);
145        jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args);
146
147        if (!env->ExceptionOccurred()) {
148            cls = env->FindClass("android/net/RouteInfo");
149            method = env->GetMethodID(cls, "<init>", "(Ljava/net/InetAddress;)V");
150            args[0].l = inetAddressObject;
151            jobject routeInfoObject = env->NewObjectA(cls, method, args);
152
153            cls = env->FindClass("android/net/DhcpInfoInternal");
154            method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V");
155            args[0].l = routeInfoObject;
156            env->CallVoidMethodA(info, method, args);
157        } else {
158            // if we have an exception (host not found perhaps), just don't add the route
159            env->ExceptionClear();
160        }
161
162        env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength);
163        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1));
164        env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2));
165        env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress,
166                env->NewStringUTF(server));
167        env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease);
168        env->SetObjectField(info, dhcpInfoInternalFieldIds.vendorInfo, env->NewStringUTF(vendorInfo));
169    }
170    return (jboolean)(result == 0);
171}
172
173static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
174{
175    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false);
176}
177
178static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info)
179{
180    return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true);
181}
182
183
184static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname)
185{
186    int result;
187
188    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
189    result = ::dhcp_stop(nameStr);
190    env->ReleaseStringUTFChars(ifname, nameStr);
191    return (jboolean)(result == 0);
192}
193
194static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname)
195{
196    int result;
197
198    const char *nameStr = env->GetStringUTFChars(ifname, NULL);
199    result = ::dhcp_release_lease(nameStr);
200    env->ReleaseStringUTFChars(ifname, nameStr);
201    return (jboolean)(result == 0);
202}
203
204static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz)
205{
206    return env->NewStringUTF(::dhcp_get_errmsg());
207}
208
209// ----------------------------------------------------------------------------
210
211/*
212 * JNI registration.
213 */
214static JNINativeMethod gNetworkUtilMethods[] = {
215    /* name, signature, funcPtr */
216
217    { "enableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_enableInterface },
218    { "disableInterface", "(Ljava/lang/String;)I",  (void *)android_net_utils_disableInterface },
219    { "resetConnections", "(Ljava/lang/String;I)I",  (void *)android_net_utils_resetConnections },
220    { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcp },
221    { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z",  (void *)android_net_utils_runDhcpRenew },
222    { "stopDhcp", "(Ljava/lang/String;)Z",  (void *)android_net_utils_stopDhcp },
223    { "releaseDhcpLease", "(Ljava/lang/String;)Z",  (void *)android_net_utils_releaseDhcpLease },
224    { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError },
225};
226
227int register_android_net_NetworkUtils(JNIEnv* env)
228{
229    jclass dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal");
230    LOG_FATAL_IF(dhcpInfoInternalClass == NULL, "Unable to find class android/net/DhcpInfoInternal");
231    dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalClass, "<init>", "()V");
232    dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;");
233    dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalClass, "prefixLength", "I");
234    dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalClass, "dns1", "Ljava/lang/String;");
235    dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalClass, "dns2", "Ljava/lang/String;");
236    dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;");
237    dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalClass, "leaseDuration", "I");
238    dhcpInfoInternalFieldIds.vendorInfo = env->GetFieldID(dhcpInfoInternalClass, "vendorInfo", "Ljava/lang/String;");
239
240    return AndroidRuntime::registerNativeMethods(env,
241            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
242}
243
244}; // namespace android
245