Linux下拨号采用的是PPP协议,这与windows是一致的.
只是windows下采用拨号程序对协议用图形化界面加以封装,因此我们在拨号时不易察觉.
而在Linux下,采利用的是pppd程序,因此较windows而言能理解的更清楚.
Linux下的GUI拨号程序是KPPP,其实也是将pppd加以封装而已.
在Linux下拨号采用的脚本为ppp-on,ppp-on-dialer,ppp-off
在默认安装的RH9下可以在/usr/share/doc/ppp/script下找到这三个脚本
这三个脚本原本是用来为普通的调制解调器作拨号脚本的,
我们可以利用这三个脚本做一定的修改,即可实现ppp拨号GPRS上网.
拨号原理为:
初始化模块,主要是设定APN:CMNET
at+cgdcont=1,ip,cmnet
然后利用chat程序拨号*99***1#
待拨号连接成功后,由pppd将建立通信链路即可.
脚本改动如下:
在ppp-on里改了电话号码为*99***1#
将账号与密码清除,
改了DIALER_SCRIPT的路径
把下面的设备改成/dev/ttyS0,速率改为19200
将crtscts参数去掉,
在ppp-on-dialer里把帐号密码去掉
改动后的脚本如下:
#!/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/testBoot/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 nocrtscts modem /dev/ttyS0 19200 asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT
在改动完成后,执行脚本ppp-on
./ppp-on
即可拨号上网
如要自己写程序来执行此脚本的话,则利用EXEC函数即可,至于EXEC的具体用法,可参阅C函数的说明书
有一点要提醒的是,在利用EXEC的时候,原进程会湮灭,而只有所执行程序的进行在运行,因此,如果想保留原进程,我采用的方法是利用fork函数,在子进程中执行脚本,而在父进程中执行自己的程序即可
Linux下拨号采用的是PPP协议,这与windows是一致的. 只是windows下采用拨号程序对协议用图形化界面加以封装,因此我们在拨号时不易察觉. 而在Linux下,采利用的是pppd程序,因此较windows而言能理解的更清楚. Linux下的GUI拨号程序是KPPP,其实也是将pppd加以封装而已. 在Linux下拨号采用的脚本为ppp-on,ppp-on-dialer,ppp-off 在默认安装的RH9下可以在/usr/share/doc/ppp/script下找到这三个脚本这三个脚本原本是用来为普通的调制解调器作拨号脚本的, 我们可以利用这三个脚本做一定的修改,即可实现ppp拨号GPRS上网. 拨号原理为: 初始化模块,主要是设定APN:CMNET at+cgdcont=1,ip,cmnet 然后利用chat程序拨号*99***1# 待拨号连接成功后,由pppd将建立通信链路即可. 脚本改动如下: 在ppp-on里改了电话号码为*99***1# 将账号与密码清除, 改了DIALER_SCRIPT的路径把下面的设备改成/dev/ttyS0,速率改为19200 将crtscts参数去掉, 在ppp-on-dialer里把帐号密码去掉改动后的脚本如下: #!/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/testBoot/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 nocrtscts modem /dev/ttyS0 19200 asyncmap 20A0000 escape FF kdebug 0 $LOCAL_IP:$REMOTE_IP noipdefault netmask $NETMASK defaultroute connect $DIALER_SCRIPT 在改动完成后,执行脚本ppp-on ./ppp-on 即可拨号上网如要自己写程序来执行此脚本的话,则利用EXEC函数即可,至于EXEC的具体用法,可参阅C函数的说明书有一点要提醒的是,在利用EXEC的时候,原进程会湮灭,而只有所执行程序的进行在运行,因此,如果想保留原进程,我采用的方法是利用fork函数,在子进程中执行脚本,而在父进程中执行自己的程序即可
标签: GPRS Linux on ppp 利用 拨号上网 脚本 进行
