The reference-ril of the android--4.2-3g transplant. pppd dial-up Internet access (iii)

<span id="Label3"></p><p><p>The REFERENCE-RIL.C in Android's Ril mechanism is the driver interface provided by the Vendor. This driver source code each vendor is provided, the Internet also has the DOWNLOAD. I now use the Huawei Wcdma. Finally compiled into <strong>libreference-ril.so</strong>. About the role of this interface driver in RIL the Android--ril mechanism source code Analysis<br></p></p><p><p>Android 4.2 comes with PPPD source code IN/EXTERNAL/PPP/PPPD. in the same way, kernel is also required to open the support for point-to-point in the network Supports.<br></p></p><p><p><br></p></p><p><p>Writing is not easy, reproduced please specify the source: http://blog.csdn.net/jscese/article/details/40340665</p></p><p><p><br></p></p>A. requestsetupdatacall:<p><p>This is the request for data traffic in the reference-ril.c, and the upper interface is requested by the ONrequest <strong>Ril_request_setup_data_call</strong> . These are in the source code analysis mentioned above, there is a specific analysis, here only from the dial-up connection Analysis.</p></p><p><p></p></p><pre name="code" class="objc">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. Attribute variable for temporary storage of dialing 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?<p><p></p></p><p>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 PDP context 1 if (strcmp (apn, "3gnet") = = 0) {alogd ("jscese display in reference are 3gnet \ N "); Err = At_send_command ("atd*99***1#", &p_response); This is Unicom 3G Internet need 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"); Assuming that the above dial-in instruction is successfully returned, a previously defined PPPD service call script is enabled to dial to obtain IP and other network Parameters//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 property value of the IP address. This value I put in the PPPD dial script to set up, assuming the success of this can be detected in the {aloge ("[%s]: wait for the IP from the 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);}</p></pre><p><p></p></p><p><p><br></p></p><p><p><br></p></p>Two. PPPD<br><p><p>Start a service in the above Requestsetupdatacall to call PPPD dial, first add in Init.rc:</p></p><p><p></p></p><pre name="code" class="html"><pre name="code" class="html">#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</pre></pre><br><p><p></p></p><p><p>The above service is used to boot up the rild, loading the libreference-ril dynamic library,</p></p><p><p>and specify the communication port for the serial port-d/dev/ttyusb2, and also the-s is the socket device-p for the loopback interface<br></p></p><p><p>The following is the PPPD dial script service, used to start the Dial script, and specify the data port.</p></p><p><p><br></p></p><p><p>This PPPD_GPRS service is required to set Permissions. Because I'm in reference-ril, I'm Adding the following in/system/core/init/property_service.c by using Properties:</p></p><p><p></p></p><pre name="code" class="objc"><pre name="code" class="objc">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}};</pre></pre><p><p></p></p><p><p></p></p><pre name="code" class="objc"><pre name="code" class="objc">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}};</pre></pre><br>Set the permissions for the net.ppp1.* to be Used.<br><p><p></p></p><p><p><br></p></p><p><p>INIT.GPRS-PPPD Set the Run permissions In/system/core/include/private/android_filesystem_config.h:</p></p><pre name="code" class="objc"><pre name="code" class="objc">static struct Fs_path_config android_files[] = {.../*jscese add for pppd */ {00777, aid_root, aid_shell, "sy STEM/ETC/INIT.GPRS-PPPD "},/* end*/...}</pre></pre><br><p><p></p></p><strong><strong>INIT.GPRS-PPPD</strong></strong>：<p><p>To post a dial-up script<br></p></p><p><p></p></p><pre name="code" class="python"><pre name="code" class="python">#!/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"</pre></pre><p><p></p></p><p><p><br></p></p><p><p><br></p></p><p><p>In addition, in this dial-up script under the same folder/system/etc/ppp/need to set up and unregister IP and other parameters of the Script. One is called when the dial SUCCEEDS. One is called when the network is disconnected:</p></p><strong><strong>Ip-up-datakey</strong></strong>：<p><p></p></p><pre name="code" class="python"><pre name="code" class="python">#!/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"</pre></pre><br><br><p><p></p></p><strong><strong>ip-down-datakey:</strong></strong><p><p></p></p><pre name="code" class="python"><pre name="code" class="python">#!/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" "" "</pre></pre><p><p></p></p><p><p><br></p></p><p><p>Post a 3gnet dial log for the Unicom apn:</p></p><p><p><br></p></p><p><p><br></p></p><p><p><br></p></p><p><p><br></p></p><p><p><br></p></p><p><p><br></p></p><p><p><br></p></p> <p><p>The reference-ril of the android--4.2-3g transplant. pppd dial-up Internet access (iii)</p></p></span>