尝试使用Perl脚本借助Expect模块实现如下功能:

  1. 登陆多台设备

设备登陆信息按如下格式存放于文件中。

$ cat
  1. 在每台设备上批量执行命令

要执行的命令集合按如下格式存放于文件中。

$ cat cmds.txt
date
w
ifconfig
more
  1. Perl脚本实现,使用了Expect模块

借助Expect模块实现登陆,执行命令,捕获命令回显,取日志,自动回复more分页,ping探测主机等功能。脚本中的语句形式可供参考。

  1. 脚本如下:
#! /usr/bin/perl

#安装模块
#cpan
#install Expect
#install Net::Ping
#perl -MCPAN -e "install autodie"

use utf8;
use Expect;
use autodie;
use Net::Ping;

#0为关闭本地回显
#$Expect::Log_Stdout=0;
$ENV{TERM}="xterm";
#不进行缓冲直接进文件
#$|=1;

#cmds.txt的文件格式:
#一行一条命令
my @cmds;
my $cmds_file="./cmds.txt";
open CMDS,"<",$cmds_file or die "Can't open file $cmds_file: $!\n";
print "commands to run: \n";
while(<CMDS>){
print "$_";
chomp;
push @cmds,$_;
}
close CMDS;
print "=============================\n";

mkdir 'log' unless -e 'log';
chomp(my $now=`date +%y%m%d`);
my $exp=Expect->new;
#$exp->raw_pty(1);

#hosts.txt的文件格式:
#IPv4地址:主机名:登陆方式(ssh/telnet):用户名:密码
my $hosts_file="./hosts.txt";
open HOSTS,"<",$hosts_file or die "Can't open file $hosts_file: $!\n";
while(<HOSTS>){
chomp;
@host=split /:/;
if(&ping_host(@host)){
&login_host(@host);
}
}
close HOSTS;
print "Loging finished!\n";

#子程序
sub{
print "login to $_[1]($_[0])...\n";
my $user=$_[3];
my $passwd=$_[4];
my $ahost=$_[1];

if($_[2] =~ /ssh/i){
$exp=Expect->spawn("ssh -l $user $_[0]") or die "Can't login to $_[1]($_[0]): $!\n";
$exp->expect(3,
[ #使用正则来表达包含关系
qr/connecting\s\(yes\/no\)\?/i,
sub {
my $self=shift;
$self->send("yes\n");
exp_continue;
}
],
[
qr/password:/i,
sub {
my $self=shift;
$self->send("$passwd\n");
exp_continue_timeout;
}
]
);
#取log
$exp->log_file("log/$_[1]-$now.log", "w");
$exp->send("\n");

foreach (@cmds){
$exp->send("$_\n");
$exp->expect(2,
[ #使用正则来表达包含关系
qr/\[>#$\]/,
sub {
my $self=shift;
$self->send("\n");
exp_continue_timeout;
}
],
[
qr/--More--/i,
sub {
my $self=shift;
$self->send(" ");
exp_continue;
}
]
);
}
#关闭log
$exp->log_file(undef);
#退出登陆
$exp->send("exit\n") if ($exp->expect(undef,'-re' => '[>#$]')); #undef是痴等
print "\nLogout from $_[1]($_[0])\n";
}else{
$exp=Expect->spawn("telnet $_[0]") or die "Can't login to $_[1]($_[0]): $!\n";
$exp->expect(30,
[ #使用正则来表达包含关系,否则就是精确匹配
qr/$ahost login:/i,
sub {
my $self=shift;
$self->send("$user\n");
exp_continue;
}
],
[
qr/Password:/i,
sub {
my $self=shift;
$self->send("$passwd\n");
exp_continue_timeout;
}
]
);
#取log
$exp->log_file("log/$_[1]-$now.log", "w");
$exp->send("\n");

foreach (@cmds){
$exp->send("$_\n");
$exp->expect(2,
[ #使用正则来表达包含关系,否则就是精确匹配
qr/\[>#$\]/,
sub {
my $self=shift;
$self->send("\n");
exp_continue_timeout;
}
],
[
qr/--More--/i,
sub {
my $self=shift;
$self->send(" ");
exp_continue;
}
]
);
}
#关闭log
$exp->log_file(undef);
#退出登陆
$exp->send("exit\n") if ($exp->expect(undef,'-re' => '[>#$]')); #undef是痴等
print "\nLogout from $_[1]($_[0])\n";
}
}

sub{
$p=Net::Ping->new("icmp"); #需要root权限
if($p->ping($_[0])){
print "$_[1]($_[0]) is alive\n";
return 1;
}else{
print "$_[1]($_[0]) is die\n";
return 0;
}
}

如果没有root权限
ping_host子程序可以替换为如下调用系统ping命令的方法

use Net::Ping::External qw(ping);
...

sub{
my $alive = ping(host => $_[0]);
if($alive){
print "$_[1]($_[0]) is alive\n";
return 1;
}else{
print "$_[1]($_[0]) is die\n";
return 0;
}
}