嵌入式linux實現pppoe撥號上網

一.交叉編譯內核

make menuconfig  -> Device Drivers -> Network device support  -> PPP (point-to-point protocol)  中，選中所有ppp選項。退出，保存配置，修改Makefile重新執行make zImage. 將arch/mips/boot/下的zImage下載到開發板上重啟系統。

二.交叉編譯pppoe server

下載ppp-2.4.5.tar.gz 、rp-pppoe-3.10.tar.gz 在 /opt 目錄下。

tar -zxvf ppp-2.4.5.tar.gz
cd ppp-2.4.5

[root@root  ppp-2.4.5 ]# ./configure  CC=mipsel-linux-gcc AR=mipsel-linux-ar BANLIB=mipsel-linux-ranlib  --host=mipsel

-------------------------------------------------------------------------

Configuring for Linux

Creating Makefiles.

  Makefile <= linux/Makefile.top

  pppd/Makefile <= pppd/Makefile.linux

  pppstats/Makefile <= pppstats/Makefile.linux

  chat/Makefile <= chat/Makefile.linux

  pppdump/Makefile <= pppdump/Makefile.linux

  pppd/plugins/Makefile <= pppd/plugins/Makefile.linux

  pppd/plugins/rp-pppoe/Makefile <= pppd/plugins/rp-pppoe/Makefile.linux

  pppd/plugins/radius/Makefile <= pppd/plugins/radius/Makefile.linux

  pppd/plugins/pppoatm/Makefile <= pppd/plugins/pppoatm/Makefile.linux

  pppd/plugins/pppol2tp/Makefile <= pppd/plugins/pppol2tp/Makefile.linux

-------------------------------------------------------------------------

再直接 make CC=mipsel-linux-gcc

編譯成功后在pppd目錄下會生成pppd把這文件拷貝到usr/sbin目錄下。 

cd /opt
tar -zxvf rp-pppoe-3.10.tar.gz
cd rp-pppoe-3.10/src

[root@root  src]# ./configure  CC=mipsel-linux-gcc AR=mipsel-linux-ar BANLIB=mipsel-linux-ranlib  --host=mipsel

-------------------------------------------------------------------------

checking whether the C compiler works... yes

checking for C compiler default output file name... a.out

checking for suffix of executables... 

checking whether we are cross compiling... yes

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether /opt/crosstool/mipsel-linux/bin/mipsel-linux-gcc accepts -g... yes

checking for /opt/crosstool/mipsel-linux/bin/mipsel-linux-gcc option to accept ISO C89... none needed

checking for mipsel-ranlib... no

checking for ranlib... ranlib

configure: WARNING: using cross tools not prefixed with host triplet

checking how to run the C preprocessor... /opt/crosstool/mipsel-linux/bin/mipsel-linux-gcc -E

checking for grep that handles long lines and -e... /bin/grep

checking for egrep... /bin/grep -E

checking for ANSI C header files... yes

checking for sys/wait.h that is POSIX.1 compatible... yes

checking for Linux 2.4 kernel-mode PPPoE support... cross-compiling, default:
no
checking packing order of bit fields... no defaults for cross-compiling

-------------------------------------------------------------------------

解決方法：進入src下直接./configure,然后修改下面的makefile和libevent下的makefile,gcc為mipsel-linux-gcc

直接 make
編譯成功后configs目錄下是rp-pppoe所需的配置文件，把這些文件全部復制到目標機的/etc/ppp目錄下(沒有就自己建一個)。

src目錄下會產生pppoe，pppoe-server，pppoe-sniff，pppoe-relay。把這些程序下載到目標機/usr/sbin目錄下。

三.配置

1)rp-pppoe-3.10/configs目錄下是rp-pppoe所需的配置文件，把這些文件全部復制到目標機的/etc/ppp目錄下(沒有就自己建一個)。
2)撥號相關的腳本程序共有6個，在rp-pppoe-3.10/scripts中。
pppoe-setup：配置程序，把輸入的帳號密碼等信息存入配置文件。
pppoe-start：撥號程序，連接網絡。
pppoe-stop：斷開。
pppoe-status：查看連接狀態。
pppoe-connect：連接網絡，被pppoe-start所調用。
pppoe-init：初始化，被其他程序調用。
把這些腳本也放到/usr/sbin目錄下。

四.測試

./pppoe-setup (下面是一些說明供參考）

>> Enter your PPPoE user name: ——此處輸入撥號帳號的用戶名 
>> Enter the Ethernet interface connected to the ADSL modem For Solaris, this is likely to be something like /dev/hme0. For Linux, it will be ethn, where n is a number. (default eth0): ——輸eth0(視情況而定) 
>> Enter the demand value (default no): ——輸no 
>> Enter the DNS information here: ——輸IP(eg:69.45.45.34)（視當地運營商的DNS服務器IP而定）
>> Please enter your PPPoE password: ——輸網通用戶口令 
>> Choose a type of firewall (0-2): ——輸0 (0為不要防火墻)
>> Accept these settings and adjust configuration files (y/n)? ——輸y

執行pppoe-start后。如果這個時候就使用pppoe-start開始連接的話，很大情況下你會得到timeout的提示，那我們該怎么做呢？需要在dev目錄下創建一個pts的文件夾，進入pts，創建節點mknod 0 c 136 0; mknod 1 c 136 1。每次鏈接都需要建立，蠻麻煩的吧，所以還是把這幾條指令寫進啟動腳本吧。相信這樣的話，一般您都會得到一個connected!的提示，說明ADSL已撥號成功,可以ping 下baidu看通不。

五.修改腳本

為了方便不用pppoe-setup,自己寫一個腳本pppoe.sh為傳參形式,把參數寫入到指定的文件內 例如:

[root@root scripts]# ./pppoe.sh pppoe-name  eth3  pppoe-passwd

#!/bin/sh

U="$1"
E="$2"
PWD1="$3"

PPPD="/usr/sbin/pppd"
CONFIG="/etc/ppp/pppoe.conf"

if [ ! -r "$CONFIG" ] ; then
   echo "Oh, dear, I don't see the file '$CONFIG' anywhere.  Please"
   echo "re-install the PPPoE client."
   exit 1
fi

# Must have pppd
if [ ! -x $PPPD ] ; then
   echo "Oops, I can't execute the program '$PPPD'.  You"
   echo "must install the PPP software suite, version 2.3.10 or later."
   exit 1
fi

sed -i "s/USER=.*/USER=$U/" $CONFIG
sed -i "s/ETH=.*/ETH=$E/" $CONFIG
sed -i "s/FIREWALL=.*/FIREWALL=NONE/" $CONFIG
sed -i "s/DNSTYPE=.*/DNSTYPE=SERVER/" $CONFIG
sed -i "s/PIDFILE=.*/PIDFILE=/var/run/pppoe-$E.pid/" $CONFIG
sed -i "s/DEMAND=.*/DEMAND=no/" $CONFIG
sed -i "s/DNS1=.*/DNS1=""/" $CONFIG
sed -i "s/DNS2=.*/DNS2=""/" $CONFIG
sed -i "s/PEERDNS=.*/PEERDNS=yes/" $CONFIG
cp $CONFIG $CONFIG-bak

if [ -r /etc/ppp/pap-secrets ] ; then
   cp /etc/ppp/pap-secrets /etc/ppp/pap-secrets-bak
else
   cp /dev/null /etc/ppp/pap-secrets-bak
fi
if [ -r /etc/ppp/chap-secrets ] ; then
   cp /etc/ppp/chap-secrets /etc/ppp/chap-secrets-bak
else
   cp /dev/null /etc/ppp/chap-secrets-bak
fi

egrep -v "^$U|^\"$U\"" /etc/ppp/pap-secrets-bak > /etc/ppp/pap-secrets
echo "\"$U\"   *       \"$PWD1\"" >> /etc/ppp/pap-secrets
egrep -v "^$U|^\"$U\"" /etc/ppp/chap-secrets-bak > /etc/ppp/chap-secrets
echo "\"$U\"   *       \"$PWD1\"" >> /etc/ppp/chap-secrets

[root@root scripts]#/usr/sbin/pppoe-connect /etc/ppp/pppoe.conf

Using interface ppp0

Connect: ppp0 <--> /dev/pts/13

Warning - secret file /etc/ppp/chap-secrets has world and/or group access

CHAP authentication succeeded: Access granted

CHAP authentication succeeded

local  IP address 192.168.2.2

remote IP address 192.168.2.1

primary   DNS address 8.8.8.8

secondary DNS address 4.4.4.4

[root@root scripts]#/usr/sbin/pppoe-status 

pppoe-status: Link is up and running on interface ppp0

ppp0      Link encap:Point-to-Point Protocol  

          inet addr:192.168.2.2  P-t-P:192.168.2.1  Mask:255.255.255.255

          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1492  Metric:1

          RX packets:7 errors:0 dropped:0 overruns:0 frame:0

          TX packets:30 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:3 

          RX bytes:61 (61.0 B)  TX bytes:1447 (1.4 KiB)

[root@root scripts]#route -n

Kernel IP routing table

Destination   Gateway      Genmask        Flags Metric Ref   Use Iface

192.168.2.1   0.0.0.0      255.255.255.255 UH    0      0       0 ppp0

0.0.0.0       192.168.2.1  0.0.0.0         UG    0      0       0 ppp0

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