久久国产成人av_抖音国产毛片_a片网站免费观看_A片无码播放手机在线观看,色五月在线观看,亚洲精品m在线观看,女人自慰的免费网址,悠悠在线观看精品视频,一级日本片免费的,亚洲精品久,国产精品成人久久久久久久

搜索
分享

Android的WiFi調(diào)試-----不能解析中文名字的AP

 開花結(jié)果 2011-11-01

在調(diào)試Wifi時,，一旦開始搜索Wifi，系統(tǒng)就會down掉,，打開debug信息,，發(fā)現(xiàn)如下內(nèi)容

I/ActivityManager( 825): Starting activity: Intent { act=android.intent.action.MAIN cmp=com.android.settings/.wifi.WifiSettings }
D/dalvikvm( 893): GC freed 3772 objects / 231344 bytes in 79ms
D/SettingsWifiEnabler( 893): Received wifi state changed from Enabling to Enabled
I/ActivityManager( 825): Displayed activity com.android.settings/.wifi.WifiSettings: 707 ms (total 707 ms)
I/wpa_supplicant( 966): CTRL-EVENT-SCAN-RESULTS Ready
V/WifiStateTracker( 825): Connection to supplicant established, state=SCANNING
D/NetworkStateTracker( 825): setDetailed state, old =IDLE and new state=SCANNING
D/ConnectivityService( 825): ConnectivityChange for WIFI: DISCONNECTED/SCANNING
D/DataConnectionTracker( 875): enableApnType(default), isApnTypeActive = false and state = IDLE
I/wpa_supplicant( 966): CTRL-EVENT-SCAN-RESULTS Ready
W/dalvikvm( 825): JNI WARNING: illegal start byte 0xb3
W/dalvikvm( 825):              string: 'bssid / frequency / signal level / flags / ssid
W/dalvikvm( 825): 00:10:18:00:00:b6    2437    171                     wireless
W/dalvikvm( 825): 02:2c:7c:04:c7:01    2437    169     [IBSS]          WZD-成人教育學(xué)院'
W/dalvikvm( 825):              in Landroid/net/wifi/WifiNative;.scanResultsCommand ()Ljava/lang/String; (NewStringUTF)
I/dalvikvm( 825): "Binder Thread #5" prio=5 tid=63 NATIVE
I/dalvikvm( 825):   | group="main" sCount=0 dsCount=0 s=N obj=0x43a5ea30 self=0x3b1178
I/dalvikvm( 825):   | sysTid=911 nice=0 sched=0/0 cgrp=unknown handle=3871032
I/dalvikvm( 825):   at android.net.wifi.WifiNative.scanResultsCommand(Native Method)
I/dalvikvm( 825):   at com.android.server.WifiService.getScanResults(WifiService.java:1050)
I/dalvikvm( 825):   at android.net.wifi.IWifiManager$Stub.onTransact(IWifiManager.java:126)
I/dalvikvm( 825):   at android.os.Binder.execTransact(Binder.java:287)
I/dalvikvm( 825):   at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm( 825):
E/dalvikvm( 825): VM aborting
I/DEBUG   ( 811): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   ( 811): Build fingerprint: 'ky6410/ky6410/ky6410/:2.1-update1/ECLAIR/eng.kyon.20100609.214617:eng/test-keys'
I/DEBUG   ( 811): pid: 825, tid: 911 >>> system_server <<<
I/DEBUG   ( 811): signal 11 (SIGSEGV), fault addr deadd00d
I/DEBUG   ( 811): r0 00000328 r1 afe1332d r2 0000000c r3 deadd00d
I/DEBUG   ( 811): r4 00000026 r5 47f6ab74 r6 000000c0 r7 fffe6184
I/DEBUG   ( 811): r8 47f6bb90 r9 46215ef8 10 46215ee4 fp 003b1108
I/DEBUG   ( 811): ip ad07f14c sp 47f6ab18 lr afe142e9 pc ad035006 cpsr 20000030
I/DEBUG   ( 811):          #00 pc 00035006 /system/lib/libdvm.so
I/DEBUG   ( 811):          #01 pc 00027698 /system/lib/libdvm.so
I/DEBUG   ( 811):          #02 pc 00028220 /system/lib/libdvm.so
I/DEBUG   ( 811):          #03 pc 00028298 /system/lib/libdvm.so
I/DEBUG   ( 811):          #04 pc 0003595a /system/lib/libandroid_runtime.so
I/DEBUG   ( 811):          #05 pc 00035d54 /system/lib/libandroid_runtime.so
I/DEBUG   ( 811):          #06 pc 00035d92 /system/lib/libandroid_runtime.so
I/DEBUG   ( 811):          #07 pc 0000ef74 /system/lib/libdvm.so
I/DEBUG   ( 811):          #08 pc 00037b28 /system/lib/libdvm.so
I/DEBUG   ( 811):          #09 pc 000311f2 /system/lib/libdvm.so
I/DEBUG   ( 811):          #10 pc 00013c88 /system/lib/libdvm.so
I/DEBUG   ( 811):          #11 pc 00019588 /system/lib/libdvm.so
I/DEBUG   ( 811):          #12 pc 00018a5c /system/lib/libdvm.so
I/DEBUG   ( 811):          #13 pc 0004d1ee /system/lib/libdvm.so


具體錯誤在
W/dalvikvm( 825):              in Landroid/net/wifi/WifiNative;.scanResultsCommand ()Ljava/lang/String; (NewStringUTF)
這句提交了一個illegal的UTF8字符

Google半天，大意為Google的UTF8是經(jīng)過修改過的,，對一些UTF8字符不兼容,。
在dalvik/vm/checkjni.c中做判斷
/*
* Verify that "bytes" points to valid "modified UTF-8" data.
*/
static void checkUtfString(JNIEnv* env, const char* bytes, bool nullOk,
    const char* func)
{
    const char* origBytes = bytes;
    if (bytes == NULL) {
        if (!nullOk) {
            LOGW("JNI WARNING: unexpectedly null UTF string/n");
            goto fail;
        }
        return;
    }
    while (*bytes != '/0') {
        u1 utf8 = *(bytes++);
        // Switch on the high four bits.
        switch (utf8 >> 4) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07: {
                // Bit pattern 0xxx. No need for any extra bytes.
                break;
            }
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0f: {
                /*
                 * Bit pattern 10xx or 1111, which are illegal start bytes.
                 * Note: 1111 is valid for normal UTF-8, but not the
                 * modified UTF-8 used here.
                 */
                LOGW("JNI WARNING: illegal start byte 0x%x/n", utf8);
                goto fail;
            }
            case 0x0e: {
                // Bit pattern 1110, so there are two additional bytes.
                utf8 = *(bytes++);
                if ((utf8 & 0xc0) != 0x80) {
                    LOGW("JNI WARNING: illegal continuation byte 0x%x/n", utf8);
                    goto fail;
                }
                // Fall through to take care of the final byte.
            }
            case 0x0c:
            case 0x0d: {
                // Bit pattern 110x, so there is one additional byte.
                utf8 = *(bytes++);
                if ((utf8 & 0xc0) != 0x80) {
                    LOGW("JNI WARNING: illegal continuation byte 0x%x/n", utf8);
                    goto fail;
                }
                break;
            }
        }
    }
    return;
fail:
    LOGW("             string: '%s'/n", origBytes);
    showLocation(dvmGetCurrentJNIMethod(), func);
    abortMaybe();
}

如果出現(xiàn)非法的UTF8字符就掛掉，這個也太狠了吧。

繼續(xù)追蹤根源,，非法UTF8字符提交來自/frameworks/base/core/jni/android_net_wifi_Wifi.cpp的函數(shù)
// Send a command to the supplicant, and return the reply as a String
static jstring doStringCommand(JNIEnv *env, const char *cmd)
{
    char reply[4096];

    if (doCommand(cmd, reply, sizeof(reply)) != 0) {
        return env->NewStringUTF(NULL);
    } else {
        return env->NewStringUTF(reply);
    }
}

網(wǎng)上提出的解決方案是將非法頭字符修正為“,？”，將其他非法字符修正為“0x80”,，patch后的函數(shù)如下：
// Send a command to the supplicant, and return the reply as a String
static jstring doStringCommand(JNIEnv *env, const char *cmd)
{
    char reply[4096];
char* bytes;
    if (doCommand(cmd, reply, sizeof(reply)) != 0) {
        return env->NewStringUTF(NULL);
    } else {
        // Make sure reply only contains valid UTF-8 Characters
        // This is borrowed from CheckJni.c
        bytes = reply;
        while (*bytes != '/0')
{
            char utf8 = *bytes;
            switch (utf8 >> 4) {
            case 0x00:
            case 0x01:
            case 0x02:
            case 0x03:
            case 0x04:
            case 0x05:
            case 0x06:
            case 0x07:
{
                // Bit pattern 0xxx. No need for any extra bytes.
                break;
            }
            case 0x08:
            case 0x09:
            case 0x0a:
            case 0x0b:
            case 0x0f:
{
                /*
                 * Bit pattern 10xx or 1111, which are illegal start bytes.
                 * Note: 1111 is valid for normal UTF-8, but not the
                 * modified UTF-8 used here. +                 */
                LOGW("JNI WARNING: illegal start byte 0x%x, changing to '?'/n", utf8);
      //return env->NewStringUTF("AP"); //modify by rockie
                *bytes = '?';
            }
            case 0x0e: {
                // Bit pattern 1110, so there are two additional bytes.
                utf8 = *(++bytes);
                if ((utf8 & 0xc0) != 0x80) {
                    LOGW("JNI WARNING: illegal continuation byte 0x%x, changing to 0x80./n", utf8);
                    *bytes = 0x80;
                     }
                // Fall through to take care of the final byte.
                  }
            case 0x0c:
            case 0x0d: {
                // Bit pattern 110x, so there is one additional byte.
                utf8 = *(++bytes);
                if ((utf8 & 0xc0) != 0x80) {

                    LOGW("JNI WARNING: illegal continuation byte 0x%x, changing to 0x80./n", utf8);
                    *bytes = 0x80;
                      }
                break;
                }

            }
            bytes++;
        }

        return env->NewStringUTF(reply);
    }
}

非常不解的是,，patch后還是會有漏網(wǎng)的錯誤字符被提交到checkjni.c，導(dǎo)致系統(tǒng)掛掉
D/wpa_supplicant( 976): Setting scan request: 5 sec 0 usec
W/wifi    ( 826): JNI WARNING: illegal start byte 0xb3, changing to '?'
W/wifi    ( 826): JNI WARNING: illegal continuation byte 0xc9, changing to 0x80.
W/wifi    ( 826): JNI WARNING: illegal continuation byte 0xc8, changing to 0x80.
W/wifi    ( 826): JNI WARNING: illegal continuation byte 0xd3, changing to 0x80.
W/wifi    ( 826): JNI WARNING: illegal start byte 0xfd, changing to '?'
W/wifi    ( 826): JNI WARNING: illegal continuation byte 0xd1, changing to 0x80.
W/dalvikvm( 826): JNI WARNING by rockie : illegal start byte 0x80, changing to '?'
W/dalvikvm( 826): JNI WARNING: illegal continuation byte 0xcb
W/dalvikvm( 826):              string: 'bssid / frequency / signal level / flags / ssid
W/dalvikvm( 826): 00:21:91:6f:f1:f2    2437    205                     dlink
W/dalvikvm( 826): 00:10:18:00:00:b6    2437    175                     wireless
W/dalvikvm( 826): 02:2c:7c:04:c7:01    2437    169     [IBSS]          WZD-? 私虁? г?
W/dalvikvm( 826):              in Landroid/net/wifi/WifiNative;.scanResultsCommand ()Ljava/lang/String; (NewStringUTF)
I/dalvikvm( 826): "Binder Thread #6" prio=5 tid=67 NATIVE
I/dalvikvm( 826):   | group="main" sCount=0 dsCount=0 s=N obj=0x43a15cb8 self=0x3d68f0
I/dalvikvm( 826):   | sysTid=951 nice=0 sched=0/0 cgrp=unknown handle=4069976
I/dalvikvm( 826):   at android.net.wifi.WifiNative.scanResultsCommand(Native Method)
I/dalvikvm( 826):   at com.android.server.WifiService.getScanResults(WifiService.java:1050)
I/dalvikvm( 826):   at android.net.wifi.IWifiManager$Stub.onTransact(IWifiManager.java:126)
I/dalvikvm( 826):   at android.os.Binder.execTransact(Binder.java:287)
I/dalvikvm( 826):   at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm( 826):
E/dalvikvm( 826): VM aborting
I/DEBUG   ( 811): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG   ( 811): Build fingerprint: 'ky6410/ky6410/ky6410/:2.1-update1/ECLAIR/eng.kyon.20100714.175405:eng/test-keys'
I/DEBUG   ( 811): pid: 826, tid: 951 >>> system_server <<<
I/DEBUG   ( 811): signal 11 (SIGSEGV), fault addr deadd00d
I/DEBUG   ( 811): r0 00000328 r1 afe1332d r2 0000000c r3 deadd00d
I/DEBUG   ( 811): r4 00000026 r5 fffe6184 r6 47f44b6c r7 fffe6184
I/DEBUG   ( 811): r8 47f45b90 r9 438f3ef8 10 438f3ee4 fp 003e1a28
I/DEBUG   ( 811): ip ad07f14c sp 47f44b08 lr afe142e9 pc ad035006 cpsr 20000030
I/DEBUG   ( 811):          #00 pc 00035006 /system/lib/libdvm.so
I/DEBUG   ( 811):          #01 pc 00027698 /system/lib/libdvm.so
I/DEBUG   ( 811):          #02 pc 00028222 /system/lib/libdvm.so
I/DEBUG   ( 811):          #03 pc 0002829c /system/lib/libdvm.so

最后,，小改下checkjni.c,，注釋掉goto fail。
不過,，會不會有后遺癥,？

    本站是提供個人知識管理的網(wǎng)絡(luò)存儲空間，所有內(nèi)容均由用戶發(fā)布,，不代表本站觀點,。請注意甄別內(nèi)容中的聯(lián)系方式、誘導(dǎo)購買等信息,，謹防詐騙,。如發(fā)現(xiàn)有害或侵權(quán)內(nèi)容，請點擊一鍵舉報,。
    轉(zhuǎn)藏 分享 獻花（0）

    0條評論

    發(fā)表

    請遵守用戶 評論公約

    類似文章 更多