利用extect自动输入密码及expect的交叉编译

一、有时需要在脚本中登录需要密码验证的机器或者使用脚本ssh scp登录 复制文件时，需要输入密码，使用expect就能对不同输入进行交互。

通过简单脚本就可以实现自动输入密码了：

expect -c ”

set timeout 5;

spawn /usr/bin/scp -r /home/dev/log dev@192.168.1.192:/home/dev/

expect {

\”yes/no\” {send \”yes\r\”; exp_continue}

\”password\” {send \”yourpassword\r\”;} #修改成远程主机用户的密码

}

expect eof;”

上面脚本如果 timeout不设定就是为10秒。

由于expect是基于tcl语言的，所以移植expect前，需先交叉编译tcl

1、下载地址

tcl：http://www.tcl.tk/software/tcltk/download.html

expect：http://sourceforge.net/projects/expect/files/latest/download?source=files

2、交叉编译tcl

lingd@ubuntu:~/arm/downloadtar−zxftcl8.6.3−src.tar.gzlingd@ubuntu: /arm/download tar -zxf tcl8.6.3-src.tar.gz
lingd@ubuntu:~/arm/download cd tcl8.6.3/unix/

lingd@ubuntu:~/arm/download/tcl8.6.3/unixexportaccvfuncstrtod=yeslingd@ubuntu: /arm/download/tcl8.6.3/unix export ac_cv_func_strtod=yes
lingd@ubuntu:~/arm/download/tcl8.6.3/unix export tcl_cv_strtod_buggy=1

lingd@ubuntu:~/arm/download/tcl8.6.3/unix./configure–prefix=/home/lingd/arm/install/tcl–host=arm−linuxlingd@ubuntu: /arm/download/tcl8.6.3/unix ./configure –prefix=/home/lingd/arm/install/tcl –host=arm-linux
lingd@ubuntu:~/arm/download/tcl8.6.3/unix make

lingd@ubuntu:~/arm/download/tcl8.6.3/unixmakeinstalllingd@ubuntu: /arm/download/tcl8.6.3/unix make install
lingd@ubuntu:~/arm/download/tcl8.6.3/unix ls /home/lingd/arm/install/tcl/

bin include lib man share

lingd@ubuntu:~/arm/download/tcl8.6.3/unixls/home/lingd/arm/install/tcl/bin/tclsh8.6lingd@ubuntu: /arm/download/tcl8.6.3/unix ls /home/lingd/arm/install/tcl/bin/
tclsh8.6
lingd@ubuntu:~/arm/download/tcl8.6.3/unix ls /home/lingd/arm/install/tcl/lib/

itcl4.0.2 libtcl8.6.so libtclstub8.6.a pkgconfig sqlite3.8.7.1 tcl8 tcl8.6 tclConfig.sh tclooConfig.sh tdbc1.0.2 tdbcmysql1.0.2 tdbcodbc1.0.2 tdbcpostgres1.0.2 thread2.7.1

注意，/configure …… 之前应该先：

export tcl_cv_strtod_buggy=1

export ac_cv_func_strtod=yes

否则，交叉编译tcl时会出现以下错误（普通编译无此错误）

fixstrtod.o: In function

fixstrtod':

fixstrtod.c:(.text+0x0): multiple definition of

fixstrtod’

strtod.o:strtod.c:(.text+0x0): first defined here

http://blog.163.com/kesic2004_com/blog/static/1655294792013018104555314/

解决方法：

3、移植expect

lingd@ubuntu:~/arm/download/tcl8.6.3/unixcd../..lingd@ubuntu: /arm/download cd ../..
lingd@ubuntu:~/arm/download ls

expect5.45.tar.gz hello hello.c tcl8.6.1-src.tar.gz tcl8.6.3 tcl8.6.3-src.tar.gz type9

lingd@ubuntu:~/arm/downloadtar−zxfexpect5.45.tar.gzlingd@ubuntu: /arm/download tar -zxf expect5.45.tar.gz
lingd@ubuntu:~/arm/download cd expect5.45/

注意，expect不支持交叉编译，所以在configure，我没有用–host=arm-linux，而是先用默认的X86 gcc，等configure后再修改Makefile

configure配置参数:

1）–prefix=/home/lingd/arm/install/expect：指定安装目录

2）–with-tcl=/home/lingd/arm/install/tcl/lib：指定tcl所在目录，通常指定为tcl安装目录下的lib路径

3）–with-x=no： 告诉配置脚本，不要查找 tk (tcl 的 GUI 组件) 或 X 窗口系统库

4）–with-tclinclude=/home/lingd/arm/install/tcl/include：指定tcl头文件所在目录，通常指定为tcl安装目录下的include路径

lingd@ubuntu:~/arm/download/expect5.45./configure–prefix=/home/lingd/arm/install/expect–with−tcl=/home/lingd/arm/install/tcl/lib–with−x=no–with−tclinclude=/home/lingd/arm/install/tcl/includelingd@ubuntu: /arm/download/expect5.45 ./configure –prefix=/home/lingd/arm/install/expect –with-tcl=/home/lingd/arm/install/tcl/lib –with-x=no –with-tclinclude=/home/lingd/arm/install/tcl/include
lingd@ubuntu:~/arm/download/expect5.45 vim Makefile

将Makefile中

CC = gcc

改为

CC = arm-linux-gcc

lingd@ubuntu:~/arm/download/expect5.45makelingd@ubuntu: /arm/download/expect5.45 make
lingd@ubuntu:~/arm/download/expect5.45 make install

make install会出现错误，可以不管，只要能正常编译生成expect和libexpect5.45.so即可

3、安装

在expect源码目录下可找到expect和libexpect5.45.so

在tcl安装目录下可找到libtcl8.6.so和tcl8.6目录

将libexpect5.45.so、libtcl8.6.so和tcl8.6目录拷贝到开发板/lib目录下

将expect拷贝到/bin目录下

如果开发板无libz.so.1库，还需要拷贝libz.so.1.2.8到开发板，并创建软链接libz.so.1