android_net_wifi_Wifi.cpp revision 1f095869536472c178046bb63c59947508eac4a6 
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 "wifi"
18
19#include "jni.h"
20#include <ScopedUtfChars.h>
21#include <utils/misc.h>
22#include <android_runtime/AndroidRuntime.h>
23#include <utils/Log.h>
24#include <utils/String16.h>
25
26#include "wifi.h"
27
28#define WIFI_PKG_NAME "android/net/wifi/WifiNative"
29#define BUF_SIZE 256
30
31//TODO: This file can be refactored to push a lot of the functionality to java
32//with just a few JNI calls - doBoolean/doInt/doString
33
34namespace android {
35
36static jint DBG = false;
37
38static int doCommand(const char *cmd, char *replybuf, int replybuflen)
39{
40    size_t reply_len = replybuflen - 1;
41
42    if (::wifi_command(cmd, replybuf, &reply_len) != 0)
43        return -1;
44    else {
45        // Strip off trailing newline
46        if (reply_len > 0 && replybuf[reply_len-1] == '\n')
47            replybuf[reply_len-1] = '\0';
48        else
49            replybuf[reply_len] = '\0';
50        return 0;
51    }
52}
53
54static jint doIntCommand(const char* fmt, ...)
55{
56    char buf[BUF_SIZE];
57    va_list args;
58    va_start(args, fmt);
59    int byteCount = vsnprintf(buf, sizeof(buf), fmt, args);
60    va_end(args);
61    if (byteCount < 0 || byteCount >= BUF_SIZE) {
62        return -1;
63    }
64    char reply[BUF_SIZE];
65    if (doCommand(buf, reply, sizeof(reply)) != 0) {
66        return -1;
67    }
68    return static_cast<jint>(atoi(reply));
69}
70
71static jboolean doBooleanCommand(const char* expect, const char* fmt, ...)
72{
73    char buf[BUF_SIZE];
74    va_list args;
75    va_start(args, fmt);
76    int byteCount = vsnprintf(buf, sizeof(buf), fmt, args);
77    va_end(args);
78    if (byteCount < 0 || byteCount >= BUF_SIZE) {
79        return JNI_FALSE;
80    }
81    char reply[BUF_SIZE];
82    if (doCommand(buf, reply, sizeof(reply)) != 0) {
83        return JNI_FALSE;
84    }
85    return (strcmp(reply, expect) == 0);
86}
87
88// Send a command to the supplicant, and return the reply as a String
89static jstring doStringCommand(JNIEnv* env, const char* fmt, ...) {
90    char buf[BUF_SIZE];
91    va_list args;
92    va_start(args, fmt);
93    int byteCount = vsnprintf(buf, sizeof(buf), fmt, args);
94    va_end(args);
95    if (byteCount < 0 || byteCount >= BUF_SIZE) {
96        return NULL;
97    }
98    char reply[4096];
99    if (doCommand(buf, reply, sizeof(reply)) != 0) {
100        return NULL;
101    }
102    // TODO: why not just NewStringUTF?
103    String16 str((char *)reply);
104    return env->NewString((const jchar *)str.string(), str.size());
105}
106
107static jboolean android_net_wifi_isDriverLoaded(JNIEnv* env, jobject)
108{
109    return (jboolean)(::is_wifi_driver_loaded() == 1);
110}
111
112static jboolean android_net_wifi_loadDriver(JNIEnv* env, jobject)
113{
114    return (jboolean)(::wifi_load_driver() == 0);
115}
116
117static jboolean android_net_wifi_unloadDriver(JNIEnv* env, jobject)
118{
119    return (jboolean)(::wifi_unload_driver() == 0);
120}
121
122static jboolean android_net_wifi_startSupplicant(JNIEnv* env, jobject)
123{
124    return (jboolean)(::wifi_start_supplicant() == 0);
125}
126
127static jboolean android_net_wifi_startP2pSupplicant(JNIEnv* env, jobject)
128{
129    return (jboolean)(::wifi_start_p2p_supplicant() == 0);
130}
131
132static jboolean android_net_wifi_killSupplicant(JNIEnv* env, jobject)
133{
134    return (jboolean)(::wifi_stop_supplicant() == 0);
135}
136
137static jboolean android_net_wifi_connectToSupplicant(JNIEnv* env, jobject)
138{
139    return (jboolean)(::wifi_connect_to_supplicant() == 0);
140}
141
142static void android_net_wifi_closeSupplicantConnection(JNIEnv* env, jobject)
143{
144    ::wifi_close_supplicant_connection();
145}
146
147static jstring android_net_wifi_waitForEvent(JNIEnv* env, jobject)
148{
149    char buf[BUF_SIZE];
150
151    int nread = ::wifi_wait_for_event(buf, sizeof buf);
152    if (nread > 0) {
153        return env->NewStringUTF(buf);
154    } else {
155        return NULL;
156    }
157}
158
159static jboolean android_net_wifi_doBooleanCommand(JNIEnv* env, jobject, jstring javaCommand)
160{
161    ScopedUtfChars command(env, javaCommand);
162    if (command.c_str() == NULL) {
163        return JNI_FALSE;
164    }
165    if (DBG) LOGD("doBoolean: %s", command.c_str());
166    return doBooleanCommand("OK", "%s", command.c_str());
167}
168
169static jint android_net_wifi_doIntCommand(JNIEnv* env, jobject, jstring javaCommand)
170{
171    ScopedUtfChars command(env, javaCommand);
172    if (command.c_str() == NULL) {
173        return -1;
174    }
175    if (DBG) LOGD("doInt: %s", command.c_str());
176    return doIntCommand("%s", command.c_str());
177}
178
179static jstring android_net_wifi_doStringCommand(JNIEnv* env, jobject, jstring javaCommand)
180{
181    ScopedUtfChars command(env, javaCommand);
182    if (command.c_str() == NULL) {
183        return NULL;
184    }
185    if (DBG) LOGD("doString: %s", command.c_str());
186    return doStringCommand(env, "%s", command.c_str());
187}
188
189
190
191// ----------------------------------------------------------------------------
192
193/*
194 * JNI registration.
195 */
196static JNINativeMethod gWifiMethods[] = {
197    /* name, signature, funcPtr */
198
199    { "loadDriver", "()Z",  (void *)android_net_wifi_loadDriver },
200    { "isDriverLoaded", "()Z",  (void *)android_net_wifi_isDriverLoaded},
201    { "unloadDriver", "()Z",  (void *)android_net_wifi_unloadDriver },
202    { "startSupplicant", "()Z",  (void *)android_net_wifi_startSupplicant },
203    { "startP2pSupplicant", "()Z",  (void *)android_net_wifi_startP2pSupplicant },
204    { "killSupplicant", "()Z",  (void *)android_net_wifi_killSupplicant },
205    { "connectToSupplicant", "()Z",  (void *)android_net_wifi_connectToSupplicant },
206    { "closeSupplicantConnection", "()V",  (void *)android_net_wifi_closeSupplicantConnection },
207    { "waitForEvent", "()Ljava/lang/String;", (void*) android_net_wifi_waitForEvent },
208    { "doBooleanCommand", "(Ljava/lang/String;)Z", (void*) android_net_wifi_doBooleanCommand},
209    { "doIntCommand", "(Ljava/lang/String;)I", (void*) android_net_wifi_doIntCommand},
210    { "doStringCommand", "(Ljava/lang/String;)Ljava/lang/String;", (void*) android_net_wifi_doStringCommand},
211};
212
213int register_android_net_wifi_WifiManager(JNIEnv* env)
214{
215    return AndroidRuntime::registerNativeMethods(env,
216            WIFI_PKG_NAME, gWifiMethods, NELEM(gWifiMethods));
217}
218
219}; // namespace android
220