The reference-ril of the android--4.2-3g transplant. PPPD Dial-up internet access (iii)

Android Ril mechanism in the REFERENCE-RIL.C is the driver interface provided by the manufacturer, the driver source of the various manufacturers are provided, the Internet also has downloaded, I now use is WCDMA, and finally compiled into Libreference-ril.so, the role of this interface driver in Ril can be referenced in the Android--ril mechanism source code Analysis

Android 4.2 comes with PPPD source code in/EXTERNAL/PPP/PPPD.

Writing is not easy, reproduced please specify the source: http://blog.csdn.net/jscese/article/details/40340665

A. Requestsetupdatacall:

This is the request for data traffic in the REFERENCE-RIL.C, and the upper interface is requested by the ONrequest Ril_request_setup_data_call . These in the above mentioned in the source code analysis has detailed analysis, here only from the dial-up connection analysis.

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] = {'} '};    Initializes an array of properties used to temporarily store dialing property variables char Ppp_local_ip[property_value_max] = {'} '};    Char Ril_pppd_tty[property_value_max] = {'} '};    Char Ppp_dns1[property_value_max] = {'} '};    Char Ppp_dns2[property_value_max] = {'} '};    Char Ppp_gw[property_value_max] = {'} '};    Char Exit_code[property_value_max] = {'} '};    int n = 1; Ril_data_call_response_v6 *responses = alloca (n * sizeof (RIL_DATA_CALL_RESPONSE_V6)); Using IPv6 APN = ((const char * *) data) [2];     Access point incoming 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 ten (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);    The at Instruction Free (cmd) of the access point is sent, #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 PD  P Context 1 if (strcmp (APN, "3gnet") = = 0)  {ALOGD ("Jscese Display in reference is 3gnet \ n");  Err = At_send_command ("atd*99***1#", &p_response); This is the Unicom 3G Internet needs to dial the number atd*99***1# get the connection} else if (strcmp (APN, "ctnet") = = 0) {alogd ("Jscese display in refer        ence 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");    If the above dial-in command returns successfully, a previously defined PPPD service call script is enabled to dial the network parameters such as IP//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, Ten) < 0)//monitor the IP address of the attribute value, this value I put in the PPPD dial script to set up, if successful here can be monitored {        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, Ten) < 0) {Aloge ("Timeout waiting net.ppp1.local-ip-g     Iving 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; This responses is provided to the upper Ril_onrequestcomplete (T, ril_e_success, responses, n * sizeof (RIL_DATA_CALL_RESPONSE_) by getting the network properties set to the    V6));    Return    Error:ril_onrequestcomplete (t, Ril_e_generic_failure, NULL, 0); At_response_free (p_response);}

Two. pppd

Start a service in the above Requestsetupdatacall to invoke PPPD dialing, first add in init.rc:

#jscese Add for Usb_switch service if 3G dongle add for Serialservice ril-daemon/system/bin/rild-l/system/lib/librefe rence-ril.so---D/DEV/TTYUSB2    class main    socket rild stream 660 root radio    socket rild-debug stream 660 Radi O system    user root    Group Radio cache inet Misc Audio Logservice Pppd_gprs/system/etc/ppp/init.gprs-pppd/dev/tty USB0    user root    Group Radio cache inet Misc    disabled    oneshot## end

The above service is used to boot up the rild, load libreference-ril dynamic library,

and specify the communication port for the serial port-D/DEV/TTYUSB2, and also the-s for the socket device-p for the loopback interface

The following is the PPPD dial-up Scripting service, which is used to start the dial script and specify the data port.

This PPPD_GPRS service needs to set permissions, because I am in the reference-ril inside the/system/core/init/property_service.c by the property is added as follows:

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 pp PD 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}};

Set the permissions for the net.ppp1.* to be used.

INIT.GPRS-PPPD set execution permissions in/system/core/include/private/android_filesystem_config.h:

static struct Fs_path_config android_files[] = {.../*jscese add for PPPD */    {00777, aid_root,      Aid_shell,    "sy STEM/ETC/INIT.GPRS-PPPD "},/*    end*/...}

INIT.GPRS-PPPD：

To post a dial-up script

#!/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 $115200 linkname datakey Unit 1 crtscts usepeerdns Noauth Defaultroute noipdefault ipcp-accept-local ipcp-accept-remote ipcp-max-failure 5 lcp-echo-interval lcp-echo-failure Modem dump Debug Kdebug 8pppd_exit=$? pppd_pid=$! /system/bin/log-t PPPD "PPPD exited with $PPPD _exit"/system/bin/setprop "Net.gprs.ppp-exit" "$PPPD _exit"

Also in this dial-up script in the same directory/system/etc/ppp/need to set up and log off IP parameters such as the script, one when the dial is successful, one is called when the network is disconnected:

Ip-up-datakey：

#!/system/bin/shcase $ 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" "$DNS 1"/system/bin/setprop "Net.ppp1.dns2" "$DNS 2"/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/shcase $ 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" "" "

Post a 3gnet dial log for the Unicom APN:

The reference-ril of the android--4.2-3g transplant. PPPD Dial-up internet access (iii)