arm中實現(xiàn)pppd連接GPRS上網(wǎng)的相關筆記，含GPRS自動撥號腳本（真正的實時監(jiān)控,斷線自動重撥）

漢江秋月夜 2016-07-13

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arm中實現(xiàn)pppd連接GPRS上網(wǎng)的相關筆記，含GPRS自動撥號腳本（真正的實時監(jiān)控,斷線自動重撥） 2012-09-05 17:06:07

分類：嵌入式

在嵌入式Linux下GPRS上網(wǎng)方案

筆記1

硬/軟件環(huán)境

基于S3C2410的嵌入式系統(tǒng)，COM1連接PC，COM2連接SIM300 GPRS模塊。
該系統(tǒng)運行在Linux 2.6.14操作系統(tǒng)下，使用ppp套件通過SIM300進行PPP撥號。

一。讓Linux內(nèi)核支持PPP

進入Linux內(nèi)核目錄，執(zhí)行#make menuconfig
Network Device Support à
       <*> PPP (point-to-point protocol) support
       [*]   PPP multilink support
       <*> PPP support for async serial ports
       <*> PPP support for sync tty ports
       <*> SLIP (serial line) support
       [*]   CSLIP compressed headers

二：ppp套件安裝

         下載ppp：ftp://ftp.samba.org/pub/ppp ×最新版本為2.4.4
         將ppp-2.4.4.tar.gz解壓至目錄
×這里默認ppp源碼目錄為$(PPP)
              #tar zxvf ppp-2.4.4.tar.gz
         然后交叉編譯ppp：
              #cd $(PPP)
#./configure
#make CC=/usr/local/arm/3.4.1/bin/arm-linux-gcc ×這里指定交叉編譯器
         將ppp套件安裝至嵌入式系統(tǒng)中：
×這里默認可執(zhí)行文件在嵌入式系統(tǒng)下的目錄為$(EMB_BIN)
#cp $(PPP)/chat/chat $(EMB_BIN)
#cp $(PPP)/pppd/pppd $(EMB_BIN)
#cp $(PPP)/pppdump/pppdump $(EMB_BIN)
#cp $(PPP)/pppstats/pppstats $(EMB_BIN)
              ×這里默認嵌入式系統(tǒng)的etc目錄為$(EMB_ETC)
              #mkdir $(EMB_ETC)/ppp
              #cp $(PPP)/etc.ppp/* $(EMB_ETC)/ppp

三：ppp套件配置

$(EMB_BIN)/dial-on.sh （GPRS啟動腳本）

#!/bin/sh
#define dial_on function
dial_on()
{
#test if pppd is running
pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -gt 0 ]
then
echo "ppp connection's already started."
else
#close ethernet interface
ifconfig eth0 down
#ppp start
pppd modem /dev/ttyS1 57600 nocrtscts lock connect "chat -v -f /etc/ppp/gprs-connect" user "" noauth debug defaultroute
# pppd配置說明：
# ttyS1：連接GPRS模塊SIM300的串口
# 57600：GPRS的撥號速率
# nocrtscts：無流控
# lock：鎖定設備
# connect “chat –v –f /etc/ppp/gprs-connect”：GPRS連接腳本文件
# user “”：用戶名，這里是無
# noauth：無需認證
# debug：輸出調(diào)試信息
# defaultroute：此撥號連接作為默認路由
echo "ppp is starting..."
fi
}
#dial on gprs
dial_on
#wait for ppp's init
sleep 5
pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -eq 0 ]
then
echo "trying 2nd time to call ppp"
dial_on
sleep 5
fi
pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
if [ $pppd_stat -eq 0 ]
then
echo "pppd error!"
echo "please check pppd's config files

$(EMB_BIN)/dial-off.sh （關閉GPRS連接腳本）

#!/bin/sh
#get pppd's pid
pid=`pidof pppd`
#if pppd process is running
if [ -n $pid ]
then
#kill pppd
kill $pid
#open the ethernet interface
ifconfig eth0 up
echo "ppp connection is closed."
else
echo "ppp connection isn't existed.

$(EMB_ETC)/ppp/gprs-connect （GPRS連接配置文件）

#GPRS連接超時設置
TIMEOUT 60
#若MODEM遇到BUSY、ERROR、NO CARRIER等信息時，停止撥號
ABORT "BUSY"
ABORT "ERROR"
ABORT "NO CARRIER"
#外送“AT”指令
'' AT
#當?shù)玫健癘K”回應時，外送AT+CGDCONT=1,"IP","CMNET"命令
"OK" "AT+CGDCONT=1,/042IP/042,/042CMNET/042"
#當?shù)玫健癘K”回應時，外送ATDT*99***1#命令
"OK" "ATDT*99***1#"
#當?shù)玫健癈ONNECT”回應時，撥號結束，程序退出
"CONNECT"

$(EMB_ETC)/ppp/pap-secrets （GPRS認證配置文件）

# Secrets for authentication using PAP
# client server secret IP addresses
'' * '' *

說明

（1）還需要在$(EMB_ETC)/ppp目錄下創(chuàng)建指向$(EMB_ETC)/resolv.conf的鏈接，用于指定PPP連接的DNS。
（2）在ppp連接時，需要關閉eth連接。在腳本中已經(jīng)設置好了，首先關閉eth連接，然后進行ppp連接，在ppp連接完成時，再開啟eth連接。
（3）最好在系統(tǒng)中開啟syslogd進程，這樣在/var/log/messages文件中會記錄GPRS進行撥號的DEBUG信息，便于調(diào)試。
（4）運行撥號腳本后，可以使用#ifconfig查看PPP連接信息。

筆記2：

arm上成功實現(xiàn)ppp撥號的腳本：

ppp-on：

#!/bin/sh
pppd modem -d -detach lock /dev/ttySAC0 19200 kdebug 4 file /etc/ppp/options crtscts noipdefault netmask 255.255.255.0 defaultroute connect /etc/ppp/chat-script

ppp-off：

#!/bin/sh
######################################################################
#
# Determine the device to be terminated.
#
if [ "$1" = "" ]; then
DEVICE=ppp0
else
DEVICE=$1
fi
######################################################################
#
# If the ppp0 pid file is present then the program is running. Stop it.
if [ -r /var/run/$DEVICE.pid ]; then
kill -INT `cat /var/run/$DEVICE.pid`
#
# If the kill did not work then there is no process running for this
# pid. It may also mean that the lock file will be left. You may wish
# to delete the lock file at the same time.
if [ ! "$?" = "0" ]; then
rm -f /var/run/$DEVICE.pid
echo "ERROR: Removed stale pid file"
exit 1
fi
#
# Success. Let pppd clean up its own junk.
echo "PPP link to $DEVICE terminated."
exit 0
fi
#
# The ppp process is not running for ppp0
echo "ERROR: PPP link is not active on $DEVICE"
exit 1

chat-script：

#!/bin/sh
exec chat -v /
TIMEOUT 5 /
ABORT "BUSY" /
ABORT "ERROR" /
ABORT "NO CARRIER" /
'' /rAT /
OK 'AT+CGDCONT=1,"IP","CMNET"' /
OK 'ATDT*99***1#' /
CONNECT '' /

設置DNS的resove.conf：

nameserver 211.136.20.203
nameserver 211.136.17.107

筆記3：

GPRS自動撥號腳本（真正的實時監(jiān)控,斷線自動重撥）：

http://www./viewthread.php?tid=8117&extra=&page=1

開機自動運行,實時監(jiān)控,斷線自動重撥
把文件傳到DM里，設置文件屬性為755，然后把啟動路徑加到init文件里即可
原設置為5秒去檢測一次，是以1字節(jié)去PING

#!/bin/sh
#請把dns1,dns2修改成拼得通的DNS,開機自動運行,實時監(jiān)控,斷線自動重撥
dns1="211.95.193.97"
dns2="211.136.20.203"
sleep 8
#/bin/pppd call gprs-siem &
sleep 12
while true
do
ping -s 1 -c 1 $dns1 #去PING第一個DNS
if [ "$?" != "0" ] #假如PING不通
then
ping -s 1 -c 2 $dns2 #去PING第二個DNS
if [ "$?" != "0" ] #假如PING不通
then
killall pppd #結束PPPD進程
pppd call gprs-siem & #再去撥號
sleep 12 #等待12秒
sleep 5 #如果是PING DNS2通的話就直接等待5秒
fi
else
sleep 5 #如果是PING DNS1通的話就直接等待5秒（一般要設置多長時間去PING請改這里）
fi
done

代碼簡明?。∷喈斢谠诤笈_時時去PING一個DNS發(fā)現(xiàn)真正地掉線，它才會去重新?lián)芴枺?！此版本?jīng)測試通過才發(fā)表。

**************************
* *
* The Gemini Project *
* *
**************************
www.! \' v1 Y# R2 P2 h: K
welcome on your dreambox! - Kernel 2.6.9 (08:14:21).
dreambox login: root
BusyBox v1.01 (2007.10.23-19:23+0000) Built-in shell (ash)
Enter 'help' for a list of built-in commands.
root@dreambox:~> /bin/sh /var/etc/ppp/aa
root@dreambox:~> AT
OK
ATZ
OK
ATH
OK
ATE1
OK
AT+CGDCONT=1,"IP","cmnet"( f$ m0 V3 U' o
OK
ATD*99***1#
CONNECT
Serial connection established.
using channel 2
Using interface ppp0
Connect: ppp0 <--> /dev/tts/0
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [LCP ConfReq id=0x1
]
rcvd [LCP ConfAck id=0x1
rcvd [LCP ConfReq id=0x3 <asyncmap 0xa0000> <pcomp> <accomp> <magic 0x2ab30537>
<auth chap MD5>]
sent [LCP ConfNak id=0x3 <auth pap>]
rcvd [LCP ConfReq id=0x5 <asyncmap 0xa0000> <pcomp> <accomp>
]
sent [LCP ConfAck id=0x5
<auth pap>]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [PAP AuthReq id=0x1 user="beeline" password=<hidden>]
rcvd [PAP AuthAck id=0x1 ""]
PAP authentication succeeded
sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
sent [IPCP ConfReq id=0x1 ]
rcvd [LCP ProtRej id=0x6 80 fd 01 01 00 0f 1a 04 78 00 18 04 78]
sent [IPCP ConfReq id=0x1 ]
sent [IPCP ConfReq id=0x1 ]
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275420253.8 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275420253.8/275420253.8/275420253.8 ms
sent [IPCP ConfReq id=0x1 ]
sent [IPCP ConfReq id=0x1 ]
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275425386.3 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss9
round-trip min/avg/max = 275425386.3/275425386.3/275425386.3 ms
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275430517.7 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275430517.7/275430517.7/275430517.7 ms
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275435653.2 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275435653.2/275435653.2/275435653.2 ms
sent [IPCP ConfReq id=0x1 ]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275440784.9 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275440784.9/275440784.9/275440784.9 ms
IPCP: timeout sending Config-Requests
sent [LCP TermReq id=0x2 "No network protocols running"]
rcvd [LCP TermAck id=0x2 "No network protocols running"]
Connection terminated.
Sending break to the modem
PDP context detached
Serial link disconnected.
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275445915.2 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275445915.2/275445915.2/275445915.2 ms
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275451048.9 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275451048.9/275451048.9/275451048.9 ms
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275456180.4 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275456180.4/275456180.4/275456180.4 ms
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275461314.4 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275461314.4/275461314.4/275461314.4 m
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275466446.2 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275466446.2/275466446.2/275466446.2 ms
PING 211.95.193.97 (211.95.193.97): 1 data bytes
9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275471577.9 ms
--- 211.95.193.97 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 275471577.9/275471577.9/275471577.9 ms
PING 211.95.193.97 (211.95.193.97): 1 data bytes

大家會問這樣一直PING下去擔心流量問題，浪費一些流量是墾定的，
不過我們是以1個字節(jié)去PING 加上返回的值一共是9個字節(jié)，也就是說5秒用9個字節(jié)
D1 U% ]& i
一個小時用9*12*60是一個小時6480字節(jié)=6。328125K
也就是說這樣一個小時加6.33K的流量
大家還是擔心的話可以改一下腳本，比如改60秒去PING一次啦，等等，都能有效去省流量?。?/p>

FROM:http://blog.csdn.net/seven407/article/details/4904877

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