Script to quickly list all host names (computer names) in the LAN under Linux

Recently, I have a need to list all host names in the LAN (in the SMB protocol), but the findsmb command always fails to list all the host names. I searched the Internet but there was no ready-made solution, so I wrote a python script.

The script will scan all IPs in the LAN ARP table and try to resolve their host names, which can list the relevant information more thoroughly.

Note that running this script requires the samba-common-bin and arp-scan packages. If you don't have them, please apt install them first.

Usage: Run directly or use python3, then enter the name of the network interface to be scanned (if you don’t know, run ifconfig to check, usually ens33, eth0, etc., which appears in the leftmost column of the command output), then press Enter and wait, it may take several minutes to run.

Root permissions are required to run! !

#!/usr/bin/env python3

import os

def shellrun(cmd):
    a = os.popen(cmd)
    b = a.read()
    c = b.split('\n')
    return c

def cutarpresult(lst):
    a = []
    b = []
    for line in lst[2:]:
        if line != '':
            a.append(line)
        else:
            break
    for line in a:
        b.append(line.split('\t')[0])
    return b

def commandmaker(ip):
    return 'nmblookup -A ' + ip

def getrst(iplist):
    rst = []
    for ip in iplist:
        rst.append(shellrun(commandmaker(ip)))
    return rst

def washrst(rst):
    rtn = []
    for line in rst:
        if line[1].split(' ')[1] != 'reply':
            rtn.append(line[:-1])
    return rtn

def main():
    interface = input('which interface to use: ')
    iplist = cutarpresult(shellrun('arp-scan -I ' + interface + ' -l'))
    for rs in washrst(getrst(iplist)):
        for line in rs:
            print(line)

if __name__ == '__main__':
    main()

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