CS476/576

Assignment #1

Due Midnight, Tuesday   Sept  21, 1999

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NAME

 
HoD - Hosts Discovery

HoD   <A.B>    <XMin> <XMax> <YMin> <YMax> <DomainName>

The first argument to HoD, A.B,  indicates  the first two bytes of an IP address
(e.g., 128.82) and the last argument is a DomainName (e.g., .cs.odu.edu).
The program looks at each IP address A.B.X.Y , where X and Y are in the
ranges [XMin .. XMax], [YMin ..YMax] and "grep"  all host names containing the DomainName. The program saves those greped names in a file called AllHosts.
 
 

For each host in the AllHosts file  the program tries to "ping" it to see
if the host is "alive"  and saves the names of those alive hosts in a file
called AliveHosts.

For each host in AliveHosts file the program tries to "telnet" to it to
see if the host runs a  telnet server and saves the names of those "telnet able"
hosts in a file called TelnetHosts.

Example:   %  HoD   128.82 2 9 1 255  '\.cs.odu.edu' 2>& /dev/null
The \. is used to avoid matching physics.odu.edu, and 2>& /dev/null
is used to through away all error messages (if you don't like to see them).
The results of running my script on "Sun Aug 29 11:35:48 EDT 1999"
are files:  AllHosts  AliveHosts  TelnetHosts
 

       nslookup, grep, ping, telnet.