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Android——4.2,android4.2


       Android的RIL机制中的 reference-ril.c 即为厂商提供的驱动接口,这个驱动源码各个厂商都是有提供的,网上也有下载,我现在用的就是huawei wcdma的,最后编译成 libreference-ril.so,关于这个接口驱动在RIL中所扮演的角色可参考 Android——RIL 机制源码分析

android 4.2自带pppd源码在/external/ppp/pppd中.


                                              撰写不易,转载请注明出处:http://blog.csdn.net/jscese/article/details/40340665


一.requestSetupDataCall:         

      这个就是在reference-ril.c 中的数据流量的request,上层的接口通过onRequest 的RIL_REQUEST_SETUP_DATA_CALL请求。这些在上面说到的源码分析里有详细分析,这里就只从拨号连接分析。

static void requestSetupDataCall(void *data, size_t datalen, RIL_Token t)
{
    const char *apn;
    char *cmd;
    int err;
    ATResponse *p_response = NULL;

    char ppp_dnses[(PROPERTY_VALUE_MAX * 2) + 3] = {'\0'}; //初始化属性数组,用于临时存储拨号的属性变量
    char ppp_local_ip[PROPERTY_VALUE_MAX] = {'\0'};
    char ril_pppd_tty[PROPERTY_VALUE_MAX] = {'\0'};
    char ppp_dns1[PROPERTY_VALUE_MAX] = {'\0'};
    char ppp_dns2[PROPERTY_VALUE_MAX] = {'\0'};
    char ppp_gw[PROPERTY_VALUE_MAX] = {'\0'};

    char exit_code[PROPERTY_VALUE_MAX] = {'\0'};

    int n = 1;
    RIL_Data_Call_Response_v6 *responses = alloca(n * sizeof(RIL_Data_Call_Response_v6)); //使用的是ipv6

    apn = ((const char **)data)[2]; //取传进来的接入点 apn
    /*    ALOGD("jscese display in reference  APN == '%s' \n",apn);
     apn ="3gnet";*/
    ALOGD("[%s] jscese display in reference  APN '%s' ", __func__, apn);

#ifdef USE_TI_COMMANDS
    // Config for multislot class 10 (probably default anyway eh?)
    err = at_send_command("AT%CPRIM=\"GMM\",\"CONFIG MULTISLOT_CLASS=<10>\"",
            NULL);

    err = at_send_command("AT%DATA=2,\"UART\",1,,\"SER\",\"UART\",0", NULL);
#endif /* USE_TI_COMMANDS */

    int fd, qmistatus;
    size_t cur = 0;
    size_t len;
    ssize_t written, rlen;
    char status[32] = {0};
    int retry = 10;
    const char *pdp_type;

    ALOGD("requesting data connection to APN '%s'", apn);

    pdp_type = "IP"; // jscese add for dial

    asprintf(&cmd, "AT+CGDCONT=1,\"%s\",\"%s\",,0,0", pdp_type, apn);
    //FIXME check for error here
    err = at_send_command(cmd, NULL); //发送接入点的AT指令
    free(cmd);
#if 0
    // Set required QoS params to default
    err = at_send_command("AT+CGQREQ=1", NULL);

    // Set minimum QoS params to default
    err = at_send_command("AT+CGQMIN=1", NULL);

    // packet-domain event reporting
    err = at_send_command("AT+CGEREP=1,0", NULL);

    // Hangup anything that's happening there now
    err = at_send_command("AT+CGACT=1,0", NULL);

#endif
    // Start data on PDP context 1
    if (strcmp(apn, "3gnet") == 0)
    {
        ALOGD("jscese display in reference  is 3gnet \n");
        err = at_send_command("ATD*99***1#", &p_response);  //这个就是联通3G上网需要拨的号码 ATD*99***1# 获取连接

    }
    else if (strcmp(apn, "ctnet") == 0)
    {
        ALOGD("jscese display in reference  is ctnet \n");
        err = at_send_command("ATD#777", &p_response);
    }

    if (err < 0 || p_response->success == 0)
    {
        goto error;
    }
    at_response_free(p_response);

    sleep(1); //Wait for the modem to finish

    property_set("net.ppp1.local-ip", "");
    property_set("net.gprs.ppp-exit", "");
    property_set("ctl.start", "pppd_gprs"); //如果上面的拨号AT指令成功返回,这里就启用之前定义好的一个pppd service 调用脚本去拨号获取IP 等网络参数

    // Dialup
    sleep(3);


    /*jscese add try 5 times to get ip*/
    int iRetry = 5;
    while (iRetry > 0)
    {
        property_get("net.gprs.ppp-exit", exit_code, "");

        if (strcmp(exit_code, "0") != 0)
        {
            ALOGE("PPPd exit with code %s", exit_code);
            iRetry = 0;
            break;
        }

        ALOGI("Waiting For Property");
        if (wait_for_property("net.ppp1.local-ip", NULL, 10) < 0) //监测 ip 地址的属性值,这个值我放在 pppd拨号脚本里面来进行设置,如果成功这里就能监测到
        {
            ALOGE("[%s]: wait for IP from ppp link at %d\n", __func__, iRetry);
        }
        else
        {
            ALOGI("[%s]: got IP from ppp link\r\n", __func__);
            break;
        }
        iRetry--;
    }

    if (iRetry <= 0)
    {
        ALOGE("[%s]: fail to get IP\r\n", __func__);
        goto error;
    }

    /*    if (wait_for_property("net.ppp1.local-ip", NULL, 10) < 0) {
     ALOGE("Timeout waiting net.ppp1.local-ip - giving up!\n");
     goto error;
     }*/

    property_get("net.ppp1.local-ip", ppp_local_ip, NULL);
    property_get("net.ppp1.dns1", ppp_dns1, NULL);
    property_get("net.ppp1.dns2", ppp_dns2, NULL);
    property_get("net.ppp1.gw", ppp_gw, NULL);
    sprintf(ppp_dnses, "%s %s", ppp_dns1, ppp_dns2);

    ALOGI("Got net.ppp1.local-ip: %s\n", ppp_local_ip);

    responses[0].status = 0;
    responses[0].suggestedRetryTime = -1;
    responses[0].cid = 1;
    responses[0].active = 2;
    responses[0].type = "PPP";
    responses[0].ifname = PPP_TTY_PATH;
    responses[0].addresses = ppp_local_ip;
    responses[0].dnses = ppp_dnses;
    responses[0].gateways = ppp_gw;  //通过获取到的 网络属性 设置这个responses 提供给上层

    RIL_onRequestComplete(t, RIL_E_SUCCESS, responses, n * sizeof(RIL_Data_Call_Response_v6));
    return;
    error: RIL_onRequestComplete(t, RIL_E_GENERIC_FAILURE, NULL, 0);
    at_response_free(p_response);

}



二.pppd

     在上面 requestSetupDataCall 中启动一个服务来调用pppd拨号,先在init.rc中添加:

 #jscese add for usb_switch service when 3G dongle add for serial

service ril-daemon /system/bin/rild -l /system/lib/libreference-ril.so -- -d /dev/ttyUSB2
    class main
    socket rild stream 660 root radio
    socket rild-debug stream 660 radio system
    user root
    group radio cache inet misc audio log


service pppd_gprs /system/etc/ppp/init.gprs-pppd /dev/ttyUSB0
    user root
    group radio cache inet misc
    disabled
    oneshot
## end

上面的服务是用来开机启动rild的,加载libreference-ril动态库,

并且指定了通信端口为串口 -d /dev/ttyUSB2,另外还有 -s 代表是socket设备 -p 代表回环接口

下面的就是pppd拨号的脚本服务了,用来启动拨号脚本,并且指定数据端口.


这个pppd_gprs 服务需要设置权限,因为我是在reference-ril里面通过属性启动的 在/system/core/init/property_service.c中添加如下:

struct {
    const char *service;
    unsigned int uid;
    unsigned int gid;
} control_perms[] = {
    { "dumpstate",AID_SHELL, AID_LOG },
    { "ril-daemon",AID_RADIO, AID_RADIO },
/*jscese add for pppd 3G*/
    { "pppd_gprs",AID_RADIO, AID_LOG },
/*end*/
     {NULL, 0, 0 }
};

struct {
    const char *prefix;
    unsigned int uid;
    unsigned int gid;
} property_perms[] = {

...

/*jscese add  pppd for 3G*/
    { "net.ppp1.",AID_RADIO,0 },
/*end*/

    { NULL, 0, 0 }
};

设置用到的net.ppp1.* 的权限。


init.gprs-pppd 设置执行权限,/system/core/include/private/android_filesystem_config.h中:

static struct fs_path_config android_files[] = {

...

/*jscese add for pppd */
    { 00777, AID_ROOT,      AID_SHELL,    "system/etc/init.gprs-pppd" },
/*    end*/

...

}

init.gprs-pppd

贴出拨号脚本

#!/system/bin/sh
 
PPPD_PID=
 
USER=`/system/bin/getprop net.gprs.user`
PASSWORD=`/system/bin/getprop net.gprs.password`
 
/system/bin/setprop "net.gprs.ppp-exit" ""

 
/system/bin/pppd $1 115200 linkname datakey unit 1 crtscts usepeerdns noauth defaultroute noipdefault ipcp-accept-local ipcp-accept-remote ipcp-max-failure 30 lcp-echo-interval 5 lcp-echo-failure 30 modem dump debug kdebug 8

PPPD_EXIT=$?
PPPD_PID=$!
 
/system/bin/log -t pppd "pppd exited with $PPPD_EXIT"
 
/system/bin/setprop "net.gprs.ppp-exit" "$PPPD_EXIT"



另外在这个拨号脚本同目录下 /system/etc/ppp/ 需要设置和注销ip等参数的脚本,一个在拨号成功时调用,一个在断开网络时调用:

ip-up-datakey

#!/system/bin/sh
case $1 in
    ppp1)
        /android/bin/iptables --flush;
        /android/bin/iptables --table nat --flush;
        /android/bin/iptables --delete-chain;
        /android/bin/iptables --table nat --append POSTROUTING --out-interface ppp0 -j MASQUERADE;
        /android/bin/iptables --append FORWARD --in-interface ppp1 -j ACCEPT;
        echo 0 > /proc/sys/net/ipv4/ip_forward;
        echo 1 > /proc/sys/net/ipv4/ip_forward;
        ;;
    ppp0)
    /system/bin/setprop "net.interfaces.defaultroute" "ppp1";
    ;;
esac
 
/system/bin/setprop "net.ppp1.dns1" "$DNS1"
/system/bin/setprop "net.ppp1.dns2" "$DNS2"
/system/bin/setprop "net.ppp1.local-ip" "$IPLOCAL"
/system/bin/setprop "net.ppp1.remote-ip" "$IPREMOTE"
/system/bin/setprop "net.ppp1.gw" "$IPREMOTE"
/system/bin/setprop "net.ppp1.if" "$IFNAME"


ip-down-datakey:

#!/system/bin/sh
case $1 in
    ppp1)
        echo 0 > /proc/sys/net/ipv4/ip_forward;
        ;;
esac
 
/system/bin/setprop "net.ppp1.dns1" ""
/system/bin/setprop "net.ppp1.dns2" ""
/system/bin/setprop "net.ppp1.local-ip" ""
/system/bin/setprop "net.ppp1.remote-ip" ""
/system/bin/setprop "net.ppp1.gw" ""
/system/bin/setprop "net.ppp1.if" ""


贴张联通apn为 3gnet 的拨号log:









安卓42文件管理在什地方

可以从网上下载类似的来代替,比如“RE管理器”“SE管理器”“小米文件管理器”,豌豆夹里都有
这主要是你下载的系统可能是第三方定制ROM,把文件管理器给精简了
可以追问的!
望采纳。
 

安卓42手机?

Android 4.2是谷歌新一代移动操作系统,它沿用了4.1版“果冻豆”(Jelly Bean)这一名称,与Android
4.1相似性很高,但仍在细节之后做了一些改进与升级,比较重要的包括:Photo
Sphere全景拍照;键盘手势输入;Miracast无线显示共享;手势放大缩小屏幕,以及为盲人用户设计的语音输出和手势模式导航功能等。尤其令人关注的是,谷歌在Android
4.2中新加入了新的恶意软件扫描功能。
目前配备安卓4.2的主流机型(并不是全部,具体可到新浪手机、腾讯手机、中关村在线等大型主流网站上去看一下)
LG Nexus 4
三星 I9250 Galaxy Nexus
三星i9000/i9100 Galaxy SII(第三方ROM CM10.1)
三星i9300 Galaxy SIII(国际版)
联想S920(手机)
步步高 VIVO X1ST (手机)
步步高 VIVO xplay (手机)
中兴N880E/N881E 也有Android4.2的官方体验版ROM
UTime X1(1.2G 四核)
UTime FX (1.2G 四核)
中兴N986
夏新 大V王子版 四核 N828
HTC早些年的G2(Magic)也可以运行Android4.2系统,不可谓不神奇!
摩托罗拉 XT910 MAXX
HIKe PANDORA 2 (Q2)
里奥N003
THL w7 (四核)
联想K900
OPPO Find 5 移动3G版
OPPO R809T
天语w68
凡尔纳V5
中兴V967S
 

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