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Script getting IP's and MAC addresses

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Top Forums Shell Programming and Scripting Script getting IP's and MAC addresses
# 1  
Old 11-04-2017
RedHat Script getting IP's and MAC addresses
Hy over there,

Lets make it simple Smilie

Using a bash script, how to grep only the ip address and the mac address and put them in a file:.

for example from the dhcp.conf file we got such things:

Quote:
host s6 {
hardware ethernet aa:aa:aa:aa:aa;
fixed-address 192.168.0.254;
}

host s5 {
hardware ethernet xx:xx:xx:xx:xx:xx;
fixed-address 192.168.0.253;
}

The script will end up with two columns IP's and MAC adresses as it is showed below:

192.168.0.254 aa:aa:aa:aa:aa:aa
192.168.0.253 xx:xx:xx:xx:xx:xx:xx

Thanks for helping Smilie
# 2  
Old 11-04-2017
Do you need that file for any other purpose than your other thread? If not, why not skip it and use the dhcp.conf as immediate input for that?
# 3  
Old 11-04-2017
RedHat
Quote:
Originally Posted by RudiC
Do you need that file for any other purpose than your other thread? If not, why not skip it and use the dhcp.conf as immediate input for that?
Oh yes i need it for the other thread , it will be the ipmacmap file if you remember Smilie

Quote:
sed '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/' ipmacmap >> forward.sh
Using the dhcp.conf file as input ! does it works?
I think the whole code should be changed, does it?

Thanks RudiC
Last edited by hermouche; 11-04-2017 at 12:16 PM..
# 4  
Old 11-04-2017
OK, let's combine the two. Try
Code:
sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address / {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I FORWARD -s /; s/$/ -j ACCEPT/; p;}' dhcp.conf

Actually, you don't need a script to execute this. In a recent bash, you can deploy "process substitution" for the sourceing:
Code:
. <(sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address / {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I FORWARD -s /; s/$/ -j ACCEPT/; p;}'  dhcp.conf)

And, if you need this frequently, add an alias definition to your .profile:
Code:
alias FWD=". <(sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address /  {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I  FORWARD -s /; s/$/ -j ACCEPT/; p;}'  dhcp.conf)"

# 5  
Old 11-04-2017
Quote:
Originally Posted by RudiC
OK, let's combine the two. Try

Code:
sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address / {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I FORWARD -s /; s/$/ -j ACCEPT/; p;}' dhcp.conf

Actually, you don't need a script to execute this. In a recent bash,

you can deploy "process substitution" for the sourceing:
Code:
. <(sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address / {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I FORWARD -s /; s/$/ -j ACCEPT/; p;}'  dhcp.conf)

And, if you need this frequently, add an alias definition to your .profile:
Code:
alias FWD=". <(sed -n '/hardware ethernet/ {s///; h; d;}; /fixed-address /  {s///; G; s/[;\n]//g; s/ / -m --mac-source /; s/^/iptables -I  FORWARD -s /; s/$/ -j ACCEPT/; p;}'  dhcp.conf)"

I am sorry, RudiC,

The following is what i typed (code):
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;}' dhcpd.conf

This is my result so far:
Code:
iptables -I FORWARD -s  -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source                192.168.0.208                 30:10:B3:42:40:46 -j ACCEPT

This is how it should be:
Code:
iptables -I FORWARD -s 192.168.0.208 -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source 30:10:B3:42:40:46 -j ACCEPT

And that's part of my dhcpd.conf file:

Code:
#ddns-update-style interim;
ddns-update-style none;
ignore client-updates;
deny client-updates;
authoritative;

#### By red for PXE Booting
allow booting;
allow bootp;
### End by red

log-facility local6;

subnet 192.168.0.0 netmask 255.255.255.0 {
        # --- default gateway

        ##### By red for PXE booting
        class "pxeclients" {    match if substring(option vendor-class-identifier, 0, 9) = "PXEClient";
        next-server 192.168.0.1;
        filename "linux-install/pxelinux.0"; }
        #### End by red

        option routers 192.168.0.1;
        option subnet-mask 255.255.255.0;
        # option nis-domain             "domain.org";
        option domain-name "ensm.intranet";
        option domain-name-servers 192.168.0.1;
        option time-offset -18000;
        range dynamic-bootp 192.168.0.5 192.168.0.239;
        default-lease-time 3600;
        max-lease-time 7200;
        # we want the nameserver to appear at a fixed address

## by red: ICI on desire reserver des adresses IP fixes a des machines ##
group {
        use-host-decl-names true;


host s6 {
                hardware ethernet E8:50:8B:F3:98:F6;
                fixed-address 192.168.0.254;
                }


        host yacine {
                hardware ethernet E8:50:8B:E1:E9:35;
                fixed-address 192.168.0.253;
                }

        host hanane {
                hardware ethernet 3C:FA:43:B1:13:3A;
                fixed-address 192.168.0.252;
                }

Thanks.


Moderator's Comments:
Mod Comment Please use CODE (not QUOTE) tags as required by forum rules!
Last edited by RudiC; 11-05-2017 at 06:07 AM.. Reason: Changed QUOTE to CODE tags.
# 6  
Old 11-05-2017
This is what I get when applying above sed script to the dhcp.conf given:
Code:
iptables -I FORWARD -s 192.168.0.254 -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source E8:50:8B:F3:98:F6 -j ACCEPT
iptables -I FORWARD -s 192.168.0.253 -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source E8:50:8B:E1:E9:35 -j ACCEPT
iptables -I FORWARD -s 192.168.0.252 -p tcp -m multiport --dports 110,143,25,465,585,993,995,80,443 -m mac --mac-source 3C:FA:43:B1:13:3A -j ACCEPT

Anything special with your dhcp.conf? What be your sed version?


EDIT: OK, after correcting the code tags (changed from QUOTE tags) we can see the leading whitespace in the dhcp.conf file that need to be taken care of.
HERE YOU CAN SEE THE IMPORTANCE OF SHOWING COMMANDS AND INPUT CHARACTER BY CHARACTER, KEY STROKE BY KEY STROKE IN CODE TAGS!
Try
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;}' dhcp.conf

Last edited by RudiC; 11-05-2017 at 06:18 AM..
# 7  
Old 11-05-2017
Yeah, you got it RudiC, thanks a lot -Smilie

I am jealous, i want to got your skills in scripting .

can you suggest any book, tutorials, .... for me.

Thank you very much for your patience with me. My english is not so good that's why my questions are not very explicit. i am sorry for that.

Well, i will apply what i've learned from you and any suggestions in coding are welcomed.

Thanks.
red
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