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

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）

  1. #!/bin/sh
  2. #define dial_on function
  3. dial_on()
  4. {
  5.        #test if pppd is running
  6.        pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
  7.        if [ $pppd_stat -gt 0 ]
  8.        then
  9.               echo "ppp connection's already started."
  10.        else
  11.               #close ethernet interface
  12.               ifconfig eth0 down
  13.               
  14.               #ppp start
  15.               pppd modem /dev/ttyS1 57600 nocrtscts lock connect "chat -v -f /etc/ppp/gprs-connect" user "" noauth debug defaultroute
  16.               # pppd配置說明：
  17.               # ttyS1：連接GPRS模塊SIM300的串口
  18.               # 57600：GPRS的撥號速率
  19.               # nocrtscts：無流控
  20.               # lock：鎖定設(shè)備
  21.               # connect “chat –v –f /etc/ppp/gprs-connect”：GPRS連接腳本文件
  22.               # user “”：用戶名，這里是無
  23.               # noauth：無需認證
  24.               # debug：輸出調(diào)試信息
  25.               # defaultroute：此撥號連接作為默認路由
  26.               echo "ppp is starting..."
  27.        fi
  28. }
  29.  
  30. #dial on gprs
  31. dial_on
  32. #wait for ppp's init
  33. sleep 5
  34. pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
  35. if [ $pppd_stat -eq 0 ]
  36. then
  37.        echo "trying 2nd time to call ppp"
  38.        dial_on
  39.        sleep 5
  40. fi
  41. pppd_stat=`ifconfig|grep ppp|wc -l|cut -b 7-7`
  42. if [ $pppd_stat -eq 0 ]
  43. then
  44.        echo "pppd error!"
  45.        echo "please check pppd's config files

$(EMB_BIN)/dial-off.sh （關(guān)閉GPRS連接腳本）

  1. #!/bin/sh

  3. #get pppd's pid
  4. pid=`pidof pppd`
  5.  
  6. #if pppd process is running
  7. if [ -n $pid ]
  8. then
  9.        #kill pppd
  10.        kill $pid
  11.        
  12.        #open the ethernet interface
  13.        ifconfig eth0 up
  14.        
  15.        echo "ppp connection is closed."
  16. else
  17.        echo "ppp connection isn't existed.

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

  1. #GPRS連接超時設(shè)置
  2. TIMEOUT 60
  3. #若MODEM遇到BUSY、ERROR、NO CARRIER等信息時，停止撥號
  4. ABORT "BUSY"
  5. ABORT "ERROR"
  6. ABORT "NO CARRIER"
  7. #外送“AT”指令
  8. '' AT
  9. #當?shù)玫健癘K”回應(yīng)時，外送AT+CGDCONT=1,"IP","CMNET"命令
  10. "OK" "AT+CGDCONT=1,/042IP/042,/042CMNET/042"
  11. #當?shù)玫健癘K”回應(yīng)時，外送ATDT*99***1#命令
  12. "OK" "ATDT*99***1#"
  13. #當?shù)玫健癈ONNECT”回應(yīng)時，撥號結(jié)束，程序退出
  14. "CONNECT"

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

  1. # Secrets for authentication using PAP
  2. # client server secret IP addresses
  3. '' * '' *

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(guān)閉eth連接。在腳本中已經(jīng)設(shè)置好了，首先關(guān)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：

  1. #!/bin/sh
  2. 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：

  1. #!/bin/sh
  2. ######################################################################
  3. #
  4. # Determine the device to be terminated.
  5. #
  6. if [ "$1" = "" ]; then
  7.  DEVICE=ppp0
  8. else
  9.  DEVICE=$1
  10. fi

  12. ######################################################################
  13. #
  14. # If the ppp0 pid file is present then the program is running. Stop it.
  15. if [ -r /var/run/$DEVICE.pid ]; then
  16.         kill -INT `cat /var/run/$DEVICE.pid`
  17. #
  18. # If the kill did not work then there is no process running for this
  19. # pid. It may also mean that the lock file will be left. You may wish
  20. # to delete the lock file at the same time.
  21.         if [ ! "$?" = "0" ]; then
  22.                 rm -f /var/run/$DEVICE.pid
  23.                 echo "ERROR: Removed stale pid file"
  24.                 exit 1
  25.         fi
  26. #
  27. # Success. Let pppd clean up its own junk.
  28.         echo "PPP link to $DEVICE terminated."
  29.         exit 0
  30. fi
  31. #
  32. # The ppp process is not running for ppp0
  33. echo "ERROR: PPP link is not active on $DEVICE"
  34. exit 1

chat-script：

  1. #!/bin/sh
  2. exec chat -v /
  3. TIMEOUT 5 /
  4. ABORT "BUSY" /
  5. ABORT "ERROR" /
  6. ABORT "NO CARRIER" /
  7. '' /rAT /
  8. OK 'AT+CGDCONT=1,"IP","CMNET"' /
  9. OK 'ATDT*99***1#' /
  10. CONNECT '' /

設(shè)置DNS的resove.conf：

  1. nameserver 211.136.20.203
  2. 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.tvrofans.org/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(shè)置文件屬性為755，然后把啟動路徑加到init文件里即可 
原設(shè)置為5秒去檢測一次，是以1字節(jié)去PING

  1. #!/bin/sh
  2. #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
  3. dns1="211.95.193.97"
  4. dns2="211.136.20.203"
  5. sleep 8
  6. #/bin/pppd call gprs-siem &
  7. sleep 12
  8. while true
  9. do
  10.        ping -s 1 -c 1 $dns1 #去PING第一個DNS
  11.        if [ "$?" != "0" ] #假如PING不通
  12.        then

  14.            ping -s 1 -c 2 $dns2 #去PING第二個DNS
  15.            if [ "$?" != "0" ] #假如PING不通
  16.            then
  17.               killall pppd #結(jié)束PPPD進程
  18.               pppd call gprs-siem & #再去撥號
  19.               sleep 12 #等待12秒
  20.               sleep 5 #如果是PING DNS2通的話就直接等待5秒
  21.            fi
  22.        else
  23.               sleep 5 #如果是PING DNS1通的話就直接等待5秒（一般要設(shè)置多長時間去PING請改這里）
  24.        fi
  25. done

代碼簡明！！它相當于在后臺時時去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。

  1.  
  2. **************************
  3. * *
  4. * The Gemini Project *
  5. * *
  6. **************************
  7. www.tvrofans.org! \' v1 Y# R2 P2 h: K
  8. welcome on your dreambox! - Kernel 2.6.9 (08:14:21).

  10. dreambox login: root

  12. BusyBox v1.01 (2007.10.23-19:23+0000) Built-in shell (ash)
  13. Enter 'help' for a list of built-in commands.

  15. root@dreambox:~> /bin/sh /var/etc/ppp/aa
  16. root@dreambox:~> AT 
  17. OK
  18. ATZ
  19. OK
  20. ATH
  21. OK
  22. ATE1
  23. OK
  24. AT+CGDCONT=1,"IP","cmnet"( f$ m0 V3 U' o
  25. OK
  26. ATD*99***1#
  27. CONNECT
  28. Serial connection established.
  29. using channel 2
  30. Using interface ppp0
  31. Connect: ppp0 <--> /dev/tts/0
  32. Warning - secret file /etc/ppp/pap-secrets has world and/or group access
  33. sent [LCP ConfReq id=0x1
  34. ]
  35. rcvd [LCP ConfAck id=0x1
  36. rcvd [LCP ConfReq id=0x3 <asyncmap 0xa0000> <pcomp> <accomp> <magic 0x2ab30537>
  37. <auth chap MD5>]
  38. sent [LCP ConfNak id=0x3 <auth pap>]
  39. rcvd [LCP ConfReq id=0x5 <asyncmap 0xa0000> <pcomp> <accomp>
  40. ]
  41. sent [LCP ConfAck id=0x5
  42. <auth pap>]
  43. Warning - secret file /etc/ppp/pap-secrets has world and/or group access
  44. sent [PAP AuthReq id=0x1 user="beeline" password=<hidden>]
  45. rcvd [PAP AuthAck id=0x1 ""]
  46. PAP authentication succeeded
  47. sent [CCP ConfReq id=0x1 <deflate 15> <deflate(old#) 15> <bsd v1 15>]
  48. sent [IPCP ConfReq id=0x1 ]
  49. rcvd [LCP ProtRej id=0x6 80 fd 01 01 00 0f 1a 04 78 00 18 04 78]
  50. sent [IPCP ConfReq id=0x1 ]
  51. sent [IPCP ConfReq id=0x1 ]
  52. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  53. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275420253.8 ms

  55. --- 211.95.193.97 ping statistics ---
  56. 1 packets transmitted, 1 packets received, 0% packet loss

  58. round-trip min/avg/max = 275420253.8/275420253.8/275420253.8 ms
  59. sent [IPCP ConfReq id=0x1 ]
  60. sent [IPCP ConfReq id=0x1 ]
  61. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  62. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275425386.3 ms

  64. --- 211.95.193.97 ping statistics ---
  65. 1 packets transmitted, 1 packets received, 0% packet loss9
  66. round-trip min/avg/max = 275425386.3/275425386.3/275425386.3 ms
  67. sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
  68. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  69. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275430517.7 ms

  71. --- 211.95.193.97 ping statistics ---
  72. 1 packets transmitted, 1 packets received, 0% packet loss
  73. round-trip min/avg/max = 275430517.7/275430517.7/275430517.7 ms
  74. sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
  75. sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
  76. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  77. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275435653.2 ms

  79. --- 211.95.193.97 ping statistics ---
  80. 1 packets transmitted, 1 packets received, 0% packet loss
  81. round-trip min/avg/max = 275435653.2/275435653.2/275435653.2 ms
  82. sent [IPCP ConfReq id=0x1 ]
  83. sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
  84. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  85. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275440784.9 ms

  87. --- 211.95.193.97 ping statistics ---
  88. 1 packets transmitted, 1 packets received, 0% packet loss
  89. round-trip min/avg/max = 275440784.9/275440784.9/275440784.9 ms
  90. IPCP: timeout sending Config-Requests
  91. sent [LCP TermReq id=0x2 "No network protocols running"]
  92. rcvd [LCP TermAck id=0x2 "No network protocols running"]
  93. Connection terminated.

  95. Sending break to the modem

  97. PDP context detached
  98. Serial link disconnected.
  99. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  100. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275445915.2 ms

  102. --- 211.95.193.97 ping statistics ---
  103. 1 packets transmitted, 1 packets received, 0% packet loss
  104. round-trip min/avg/max = 275445915.2/275445915.2/275445915.2 ms
  105. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  106. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275451048.9 ms

  108. --- 211.95.193.97 ping statistics ---
  109. 1 packets transmitted, 1 packets received, 0% packet loss
  110. round-trip min/avg/max = 275451048.9/275451048.9/275451048.9 ms
  111. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  112. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275456180.4 ms

  114. --- 211.95.193.97 ping statistics ---
  115. 1 packets transmitted, 1 packets received, 0% packet loss
  116. round-trip min/avg/max = 275456180.4/275456180.4/275456180.4 ms
  117. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  118. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275461314.4 ms

  120. --- 211.95.193.97 ping statistics ---
  121. 1 packets transmitted, 1 packets received, 0% packet loss
  122. round-trip min/avg/max = 275461314.4/275461314.4/275461314.4 m
  123. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  124. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275466446.2 ms
  125. --- 211.95.193.97 ping statistics ---
  126. 1 packets transmitted, 1 packets received, 0% packet loss
  127. round-trip min/avg/max = 275466446.2/275466446.2/275466446.2 ms
  128. PING 211.95.193.97 (211.95.193.97): 1 data bytes
  129. 9 bytes from 211.95.193.97: icmp_seq=0 ttl=244 time=275471577.9 ms

  131. --- 211.95.193.97 ping statistics ---
  132. 1 packets transmitted, 1 packets received, 0% packet loss
  133. round-trip min/avg/max = 275471577.9/275471577.9/275471577.9 ms
  134. 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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