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Full Discussion: Nmap shell script goes in infinite loop
Top Forums Programming Nmap shell script goes in infinite loop Post 302998127 by Don Cragun on Thursday 25th of May 2017 03:22:46 PM
Old 05-25-2017
With your code:
Code:
while read -r line
do
name="$line"
echo "$name"
count=$line

nmap -oG output.txt -T4 -f -iL iplist.txt $line1
done < iplist.txt

you have three names for the contents of a line from iplist.txt: line, name, and count. But in your invocation of nmap you use $line1. Since line1 has not been defined in your script anywhere, that will expand to an empty string unless line1 is an exported variable in your environment.

I don't have nmap on my system. The Linux nmap man page isn't clear about what servers(s) it attempts to scan if no targets are given on the command line. Maybe it seems like an infinite loop because you are trying to scan every server on the internet???
 

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LEARN ABOUT REDHAT

nmapfe

NMAPFE(1)						      General Commands Manual							 NMAPFE(1)

NAME

       nmapfe (xnmap) - GTK+ graphical frontend to the Nmap Security Scanner

SYNOPSIS

       nmapfe [ any Glib options such as --display ]

DESCRIPTION

       Nmapfe  (also known as xnmap) is a convenient X Window front end for the Nmap Security Scanner.	Most of the options correspond directly to
       Nmap options, which are described in detail in the Nmap man page.  We recommend you read that first.  There is also limited help  available
       via the NmapFE "Help" menu.

AUTHOR

       NmapFE was originally written by Zach Smith <key@aye.net>

       It is now maintained by Fyodor <fyodor@insecure.org>

       Feel free to write me ( fyodor@insecure.org ) with questions or bug reports.

DISTRIBUTION

       The newest version of nmapfe can be obtained from http://www.insecure.org/nmap/

       nmapfe is (C) 1999, 2000 by Fyodor (fyodor@insecure.org)

       This  program  is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; Version 2.  This guarantees your right to use, modify, and redistribute Nmap under  certain  conditions.	If
       this license is unacceptable to you, Insecure.Org may be willing to sell alternative licenses (contact fyodor@insecure.org ).

       Source is provided to this software because we believe users have a right to know exactly what a program is going to do before they run it.
       This also allows you to audit the software for security holes (none have been found so far).

       Source code also allows you to port nmapfe to new platforms, fix bugs, and add new features.   You  are	highly	encouraged  to	send  your
       changes	to  Fyodor  for possible incorporation into the main Nmap distribution.  By sending these changes to Fyodor or nmap-hackers, it is
       assumed that you are offering Fyodor the unlimited, non-exclusive right to reuse, modify, and relicense the code.  If you wish  to  specify
       special license conditions of your contributions, please state them up front.

       This  program  is  distributed  in  the	hope  that  it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details (it is in the COPYING  file  of  the
       nmap distribution).

       It  should  also be noted that Nmap has been known to crash certain poorly written applications, TCP/IP stacks, and even operating systems.
       Nmap should never be run against mission critical systems unless you are prepared to suffer downtime.  We acknowledge here  that  Nmap  may
       crash your systems or networks and we disclaim all liability for any damage or problems Nmap could cause.

																	 NMAPFE(1)
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