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Listing IPs from the dhcpd.conf

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Top Forums Shell Programming and Scripting Listing IPs from the dhcpd.conf
# 8  
Old 11-10-2017
Three comments first:
- use CODE not QUOTE tags for both code and data / output / errors.
- no caleidoscope (abundant colours) needed.
- ALWAYS add your environment info: OS, awk, etc. versions.

Your ^@ problem comes from the %c format specifier in the printf command. Replace by %s. My fault, sorry.
This User Gave Thanks to RudiC For This Post:
rbatte1
# 9  
Old 11-15-2017
Hy,

I'm still working on the same firewall :-)

I've got a file with such a following lines:
Code:
192.168.0.6     00:71:CC:6E:A3:33   
192.168.0.7     C0:38:96:72:8B:5B   
192.168.0.8     08:ED:B9:08:94:09   
192.168.0.9     D0:53:49:CB:FE:0F   
192.168.0.10    C4:8E:8F:8F:45:A7   
192.168.0.11     54:35:30:4E:01:8D   
192.168.0.12     DC:A9:71:9B:3C:AA   
192.168.0.13     D8:5D:E2:4E:F2:C5

How to revert them, i mean like this:
Code:
00:71:CC:6E:A3:33    192.168.0.6
C0:38:96:72:8B:5B     192.168.0.7
.......
.......

I've got gawk-3.1.7-10 and sed-4.2.1-10 in my OS

I have no idea of how to do it, so i'm sorry i can't give my own work!!

Thanks a lot.
# 10  
Old 11-15-2017
Code:
while read ip mac x; do
   echo $mac $ip
done < file

00:71:CC:6E:A3:33 192.168.0.6
C0:38:96:72:8B:5B 192.168.0.7
08:ED:B9:08:94:09 192.168.0.8
D0:53:49:CB:FE:0F 192.168.0.9
C4:8E:8F:8F:45:A7 192.168.0.10
54:35:30:4E:01:8D 192.168.0.11
DC:A9:71:9B:3C:AA 192.168.0.12
D8:5D:E2:4E:F2:C5 192.168.0.13

edit: I 'undeleted' my post because you referenced it two posts from now, but RudiC is right.. this should be done when producing the file. Sorry for butting in without reading the thread Smilie
# 11  
Old 11-15-2017
Why not just reverse the output fields when producing the file?
# 12  
Old 11-15-2017
RedHat
Thank you for the very quick reply Scott
It seem's so simple when we see the solution ......

Thanks again,

---------- Post updated at 10:45 AM ---------- Previous update was at 10:35 AM ----------

Quote:
Originally Posted by RudiC
Why not just reverse the output fields when producing the file?
Hello RudiC,

Well the file comes from your sed command:

Code:
sed -n '/^ *hardware ethernet/ {s///; h; d;}; /^ *fixed-address / {s///; G; s/[;\n]//g; s/ / -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source /; s/^/iptables -I FORWARD -s /; s/$/ -j ACCEPT/; p;}' /etc/dhcp/dhcpd.conf >> forward.sh

Then i flushed all the uneeded letters from the forward.sh file in order to get a file with these two rows (ip & MAC)

Thanks RudiC for your interest , appreciated :-)
Last edited by RudiC; 11-15-2017 at 12:31 PM.. Reason: Took out the diversity of font / format control statements.
# 13  
Old 11-15-2017
Well, I was afraid you did so: combining multiple "sub solutions" (small solutions to fulfill / resolve partial problems) collected when posting "sub questions" into an overly complex "general solution".

This is not what I imagined in post#6: one single command / script, be it sed or awk reading your dhcpd.conf once and outputting the rules file for your iptables

Take a step back and reconsider the overall problem, taking into account the basic input data and the required output. Methinks you've got everything at your fingertips from yout recent threads / posts.
# 14  
Old 11-15-2017
RedHat
Quote:
Originally Posted by RudiC
Well, I was afraid you did so: combining multiple "sub solutions" (small solutions to fulfill / resolve partial problems) collected when posting "sub questions" into an overly complex "general solution".

This is not what I imagined in post#6: one single command / script, be it sed or awk reading your dhcpd.conf once and outputting the rules file for your iptables

Take a step back and reconsider the overall problem, taking into account the basic input data and the required output. Methinks you've got everything at your fingertips from yout recent threads / posts.
LOL, actually I am using all the combined codes of all the previews posts for my firewall ;-) (your codes)

Now, this is different, i want to fill a file /etc/ethers with these two columns IP & MAC :-)

So the question : from where can i bring the IP's and the MAC adresses. That's why i said (dhcpd.conf) in this last post.

Code:
man ethers

Last edited by hermouche; 11-15-2017 at 02:01 PM..
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