使用 Bash 解析 dhcpd.lease 文件 [英] Parse a dhcpd.lease File with Bash

问题描述

我尝试使用 Basel 解析我的 dhcpd.lease 文件.典型的条目如下所示:

I Try to parse my dhcpd.lease File with Basel. A typical entry looks like this:

lease 192.168.20.4 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 00:00:00:00:00:00;
    uid 00:00:00:00:00:00;
    client-hostname "examle-workstation1";
}

我得到的所有信息都是 MAC，我想要的是 IP 和客户端主机名.但也许，没有客户端主机名.条目如下所示:

All information i get is the MAC and what i want ist the IP and the client-hostname. But maybe, there is no client-hostname. The entry looks like this:

lease 192.168.20.5 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 00:00:00:00:00:00;
}

我的第一个想法是 grep 租用属性、硬件以太网属性和 uid 属性，并将它们全部放在一行中.然后解析它.

My first idea was to grep the lease attribute, the hardware ethernet attribute and the uid attribute and putt it all on one line. And then parse it.

但我的问题是，我有一个大文件，其中许多条目分配在许多文件中.树看起来像这样:

But my problem is, i have a big file with many entries allocated in many files. The tree looks like this:

dhcpd-leases
-- 192.168.20.0
-- 192.168.30.0
-- 192.168.40.0
[...]

我得到的只是从另一个文件解析到列表中的 MAC.所以我从这个列表开始，想用我的 MAC 来 grep 属性 ip、ma​​c:

And all what i get ist the MACs parsed from another files in to a list. So i start with this list and want to grep the Attributes ip, mac with my MAC:

for ENTRY in $MACLIST
do
    VAR$(cat "dhcpd-leases/10.148.$NETWORK.2/dhcpd.leases" | grep -E "$MAC|lease|client-hostname")
    echo $VAR
done

但是因为 $VAR 中有很多条目并且我无法正确解析文件.

But it because of the many entrys in the $VAR and the files im unable to Parse it out right.

有人可以帮忙吗?

最好的问候彼得

推荐答案

假设你的 maclist 文件看起来像这样(例如只有一个条目)

assuming your maclist file look like this (just one entry for example)

$ cat maclist
00:00:00:00:00:01

和你的租约文件这样

$ cat file
lease 192.168.20.4 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 00:00:00:00:00:00;
    uid 00:00:00:00:00:00;
    client-hostname "examle-workstation1";
}

lease 192.168.20.5 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 00:00:00:00:00:00;
}

lease 192.168.20.6 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 00:00:00:00:00:01;
    uid 00:00:00:00:00:01;
    client-hostname "examle-workstation2";
}


lease 192.168.20.7 {
    starts 6 2009/06/27 00:40:00;
    ends 6 2009/06/27 12:40:00;
    hardware ethernet 01:00:00:00:00:00;
}

你可以试试这个

awk 'BEGIN{
    while( (getline line < "maclist") > 0){
        mac[line]
    }
    RS="}"
    FS="
"
}
/lease/{
    for(i=1;i<=NF;i++){
        gsub(";","",$i)
        if ($i ~ /lease/) {
            m=split($i, IP," ")
            ip=IP[2]
        }
        if( $i ~ /hardware/ ){
            m=split($i, hw," ")
            ether=hw[3]
        }
        if ( $i ~ /client-hostname/){
            m=split($i,ch, " ")
            hostname=ch[2]
        }
        if ( $i ~ /uid/){
            m=split($i,ui, " ")
            uid=ui[2]
        }
    }
    if ( ether in mac ){
        print "ip: "ip " hostname: "hostname " ether: "ether " uid: "uid
    }
} ' file

输出

$ ./shell.sh
hostname: "examle-workstation2" ether: 00:00:00:00:00:01 uid: 00:00:00:00:00:01

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