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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.同样,kernel中也是需要打开对point-to-point 的支持,在network support里面.
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。
staticvoidrequestSetupDataCall(voidvoid*data,size_tdatalen, RIL_Token t)
{
constcharchar*apn;
charchar*cmd;
interr;
ATResponse*p_response =NULL;
charppp_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
charppp_local_ip[PROPERTY_VALUE_MAX] = {'\0'};
charril_pppd_tty[PROPERTY_VALUE_MAX] = {'\0'};
charppp_dns1[PROPERTY_VALUE_MAX] = {'\0'};
charppp_dns2[PROPERTY_VALUE_MAX] = {'\0'};
charppp_gw[PROPERTY_VALUE_MAX] = {'\0'};
charexit_code[PROPERTY_VALUE_MAX] = {'\0'};
intn =1;
RIL_Data_Call_Response_v6*responses = alloca(n*sizeof(RIL_Data_Call_Response_v6));//使用的是ipv6
apn = ((constcharchar**)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 */
intfd, qmistatus;
size_tcur =0;
size_tlen;
ssize_t written, rlen;
charstatus[32] = {0};
intretry =10;
constcharchar*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
}
elseif(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)
{
gotoerror;
}
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*/
intiRetry =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__);
gotoerror;
}
/* if (wait_for_property("net.ppp1.local-ip", NULL, 10)
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{
constcharchar*service;
unsigned intuid;
unsigned intgid;
} 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{
constcharchar*prefix;
unsigned intuid;
unsigned intgid;
} 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:
staticstructfs_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 $1115200linkname datakey unit1crtscts usepeerdns noauth defaultroute noipdefault ipcp-accept-local ipcp-accept-remote ipcp-max-failure30lcp-echo-interval5lcp-echo-failure30modem dump debug kdebug8
PPPD_EXIT=$?
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 $1in
ppp1)
/android/bin/iptables --flush;
/android/bin/iptables --table nat --flush;
/android/bin/iptables --delete-chain;
/android/bin/iptables --table nat --append POSTROUTING --out-interface ppp0 -j MASQUERADE;
/android/bin/iptables --append FORWARD --in-interface ppp1 -j ACCEPT;
echo 0> /proc/sys/net/ipv4/ip_forward;
echo 1> /proc/sys/net/ipv4/ip_forward;
;;
ppp0)
/system/bin/setprop "net.interfaces.defaultroute""ppp1";
;;
esac
/system/bin/setprop "net.ppp1.dns1""$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 $1in
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:
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