linux下通过gprs模块拨号上网

共有 1 条评论

1. Fromlung 于 2008-03-28 16:08:00发表:

   下面是对脚本的一些说明。
   
   

   引用:

   /home/a/ppp/ppp-on
   
   #!/bin/sh
   
   #
   
   # Script to initiate a ppp connection. This is the first part of the
   
   # pair of scripts. This is not a secure pair of scripts as the codes
   
   # are visible with the 'ps' command. However, it is simple.
   
   #
   
   # These are the parameters. Change as needed.
   
   TELEPHONE=*99***1# # The telephone number for the connection
   
   ACCOUNT= # The account name for logon (as in 'George Burns')
   
   PASSWORD= # The password for this account (and 'Gracie Allen')
   
   LOCAL_IP=0.0.0.0 # Local IP address if known. Dynamic = 0.0.0.0
   
   REMOTE_IP=0.0.0.0 # Remote IP address if desired. Normally 0.0.0.0
   
   NETMASK=255.255.255.0 # The proper netmask if needed
   
   #
   
   # Export them so that they will be available at 'ppp-on-dialer' time.
   
   export TELEPHONE ACCOUNT PASSWORD
   
   #
   
   # This is the location of the script which dials the phone and logs
   
   # in. Please use the absolute file name as the $PATH variable is not
   
   # used on the connect option. (To do so on a 'root' account would be
   
   # a security hole so don't ask.)
   
   #
   
   DIALER_SCRIPT=/home/a/ppp/ppp-on-dialer
   
   #
   
   # Initiate the connection
   
   #
   
   # I put most of the common options on this command. Please, don't
   
   # forget the 'lock' option or some programs such as mgetty will not
   
   # work. The asyncmap and escape will permit the PPP link to work with
   
   # a telnet or rlogin connection. You are welcome to make any changes
   
   # as desired. Don't use the 'defaultroute' option if you currently
   
   # have a default route to an ethernet gateway.
   
   #
   
   exec /usr/sbin/pppd debug lock modem /dev/ttyS0 115200 /
   
   asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP /
   
   noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT
   
   exec /usr/sbin/pppd debug lock modem /dev/ttyS0 115200 /
   
   asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP /
   
   noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT这个命令的作用是：（可以使用man pppd查看帮助）
   
   运行/usr/sbin/pppd程序，给它传入命令行参数的意义是：
   
   /dev/ttyS0: 拨号所用的MODEM所连接的串口（ttyS0是串口1，ttyS1是串口2...)
   
   115200 : MODEM的通信速率（57600 BPS)
   
   modem : 用MODEM进行拨号。
   
   nocrtscts : 无流控
   
   lock : 锁定这个设备
   
   debug ：输出调试信息
   
   defaultroute : 此拨号连接作为默认路由
   
   connect /home/a/ppp/ppp-on-dialer:使用/home/a/ppp/ppp-on-dialer进行拨号
   
   
   
   /home/a/ppp/ppp-on-dialer
   
   #!/bin/sh
   
   #
   
   # This is part 2 of the ppp-on script. It will perform the connection
   
   # protocol for the desired connection.
   
   #
   
   exec chat -v /
   
   TIMEOUT 3 /
   
   ABORT '/nBUSY/r' /
   
   ABORT '/nNO ANSWER/r' /
   
   ABORT '/nRINGING/r/n/r/nRINGING/r' /
   
   '' /rAT /
   
   'OK-+++/c-OK' ATH0 /
   
   TIMEOUT 30 /
   
   OK AT+IPR=115200 /
   
   OK AT+CGDCONT=1,"IP","CMNET" /
   
   OK AT+CGACT=1,1 /
   
   OK ATDT*99***1# /
   
   CONNECT '' /
   
   # ogin:--ogin: $ACCOUNT /
   
   # assword: $PASSWORD
   
   chat命令的帮助请参考man -a chat查看。
   
   ABORT BUSY
   
   ABORT ERROR
   
   ABORT NO CARRIER
   
   ABORT NO DIALTONE
   
   ABORT RING
   
   <--------如果遇到MODEM回应"BUSY","ERROR","NO CARRIER","NO DIALTONE"则立即报错并退出拨号。
   
   "" AT
   
   <--------外送"AT"命令。
   
   OK AT+IPR=115200
   
   <--------设置波特率。
   
   "OK" "AT+CGDCONT=1,“ip”，“cmnet”
   
   <---当判到“OK"回应时，外送AT+CGDCONT=1,"ip","cmnet" 命令。设置GPRS接人网关。其中CMNET为移动梦网的接人网关
   
   OK AT+CGACT=1,1
   
   <--------激活GPRS功能，如果返回OK，则GPRS连接成功;如果返回ERROR则意味着GPRS失败。这时候应该检查一下SIM卡的GPRS业务是否已经开通，GPRS模块天线是否安装正确等问题。
   
   "OK" "ATDT*99***1#"
   
   <---当判到“OK"回应时，外送拨号ATDT*99***1# 命令。
   
   "CONNECT"
   
   <---当判到“CONNECT"回应时，拨号结束，程序退出。
   
   
   
   /home/a/ppp/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