cn lab programs

7/23/2019 Cn Lab Programs

1/36

B.Tech. (CSE)Fifth Semester

COMPUTER NETWORKS LAB

Code EURCS !"" C#te$or% CE

Credits & 'ors *er +ee, -e*#rtmet CSE

". Write a program to

a. Print the IP address of a www.yahoo.com

b. Print the url of 205.163.22.10

c. Print all the addresses of www.apple.com

d. Print the IP address of the local machinee. Print the hostname of the local machine

&.Write a program to Identify the well !nown ports on a "emote #ystem$y trying to listen to the %arious well !nown ports by opening client connections. If the

e&ception does not occur then the remote port is acti%e else the remote port is inacti%e.

. 'i%en a (")* write a program to print the parts of (").

/. Write a program to display the soc!et+s port and IP address.

!. Write a program to send , "ecei%e data from -atagramPac!et

0. Write a program for ulticast #niffer

1. Write a program for ulticast sender2.Write a program for a /hat pplication

nene $y opening soc!et connection and displaying what is written by one party to

the other.

anyany 4$road cast ach client opens a soc!et connection to the chat ser%er and

writes to the soc!et. Whate%er is written by one party can be seen by all other parties.

3. Write a program for the -ata "etrie%al from a "emote -atabaset the remote database a ser%er listens for client connections. 7his ser%er accepts #8) 9ueries

from the client* e&ecutes it on the database and sends the response to the client.

"4. Write a program for the ail /lient

PP /lient 'i%es the ser%er name * user name and password retrie%e the mails and

allow manipulation of mail bo& using PP commands.

#7P /lient 'i%es the ser%er name* send email to the recipient using #7P

commands 4/ore :a%a 2 pg163.

"". Write a program for the #imulation of 7elnet

Pro%ide a user interface to contact well!nown ports* so that clientser%er interaction can be seenby the user.

"&.Write a program for the #imple file transfer between two systems

$y opening soc!et connection to our ser%er on one system and sending a file from one system toanother.

".Write a program for the 7;7P/lient7o de%elop a 7;7P client for file transfer. 4(ni&


2/36

Lab Programs

". Write a program to

#. Prit the 6P #ddress of # +++.%#hoo.com 7 +++.$it#m.ed

Pro$r#m

+++.%#hoo.com

import @a%a.net.AB

public class IPddressC

public static %oid main 4#tring argsDE

C

try

C

Inetddress addresses F Inetddress.get$y


3/36

H

Ot*t

www.gitam.edu?12.16J.23.

(OR)

Pro$r#m

import @a%a.net.AB

import @a%a.io.AB

public class IP;inder

C

public static %oid main4#tringDE args throws I&ception

C

#tring hostB

$uffered"eader input Fnew $uffered"eader4new Input#tream"eader4#ystem.inB

#ystem.out.print4GKnKnnterhost name GB

host F input.read)ine4B

try

C

Inetddress address F Inetddress.get$y


4/36

5. Prit the r8 of &4!."0.&&."4/

Pro$r#m

import @a%a.net.AB

class (")

C

public static %oid main 4#tring argsDE

C

try

C

Inetddress address F Inetddress.get$y


5/36

Prit #88 the #ddresses of +++.$it#m.ed

Pro$r#m

import @a%a.net.AB

class llddress C

public static %oid main 4#tring argsDE C

try

C

InetddressDE address F Inetddress.getll$y


6/36

IP ddress is padma@aP/?1O2.1O.2J.J

e. Prit the host#me of the 8oc#8 m#chie #d host#me

Pro$r#m

??Print the IP address of the local machine , host name

import @a%a.net.ABclass myddress1 C

public static %oid main 4#tring argsDE C

try C

?? 7o get local machine+s IP address

Inetddress address F Inetddress.get)ocal=ost4B

#ystem.out.println4GKn IP ddress is GLaddressB

?? 7o get the local machine+s name

#tring s1Faddress.get=ost


7/36

#ystem.out.println4G7here is ser%er on port G LiLG of GLhostB

s.close4B

H

catch4I&ception ieC

H

H

H

H

Ot*t

7here is ser%er on port 135 of localhost

(OR)

import @a%a.io.ABimport @a%a.net.AB

public class w!portsC

public static %oid main4#tring argsDE throws &ception

CInetddress addressFInetddress.get)ocal=ost4B

#tring hostFaddress.get=ost


8/36

Port 5 cti%e

(OR)

Pro$r#m

import @a%a.net.AB

import @a%a.io.AB

public class Port#canner

C

public static %oid main4#tringDE argsC

#tring host F GlocalhostGB

if 4args.length 0

Chost F argsD0EB

H

tryC

Inetddress theddress F Inetddress.get$y


9/36

Pro$r#m

import @a%a.net.AB

import @a%a.io.AB

public class )owPort#cannerC

public static %oid main4#tringDE args

C

#tring host F GlocalhostGBif 4args.length 0

C

host F argsD0EBH

for 4int i F 1B i M 102B iLL

Ctry

C

#oc!et s F new #oc!et4host* iB#ystem.out.println4G7here is a ser%er on port G L i L G of G L hostB

H ?? end try

catch 4(n!nown=ost&ception e&

C#ystem.err.println4e&B

brea!B

H ?? end catchcatch 4I&ception e&

C

?? must not be a ser%er on this portH ? end catch

H ?? end for

H ?? end main

H ?? end Port#canner

Ot*t

. ;i9e # URL< +rite # *ro$r#m to *rit the *#rts of URL.

Pro$r#m

import @a%a.net.AB

import @a%a.io.AB


10/36

public class get(")Parts C

public static %oid main4#tring argsDE C

for 4int i F 0B i M args.lengthB iLL C

try C

(") u F new (")4argsD0EB

#ystem.out.println4G7he (") is G L uB

#ystem.out.println4G7he protocol part is G L u.getProtocol4B

#ystem.out.println4G7he host part is G L u.get=ost4B

#ystem.out.println4G7he port part is G L u.getPort4B

#ystem.out.println4G7he file part is G L u.get;ile4B

#ystem.out.println4G7he ref part is G L u.get"ef4B

H ?? end try

catch 4alformed(")&ception e C

#ystem.err.println4argsD0E L Gis not a (") I understand.GB

H

H ?? end for

H ?? end main

H ?? end get(")Parts

Ot*t

4"

Pro$r#m

import @a%a.net.AB

import @a%a.io.AB

import @a%a.lang.AB

import @a%a.net.(")B

public class Parse(") C


11/36

public static %oid main4#tringDE args throws &ception C

(") a(") F new (")4Ghttp??e&ample.comJ0?docs?boo!s?tutorialG

L G?inde&.htmlRnameFnetwor!ingS-W


12/36

if 4host QF null C

int at#ign F host.inde&f4NTNB

if 4at#ign QF 1 host F host.substring4at#ignL1B

#ystem.out.println4G7he host is G L hostB

H

else C

#ystem.out.println4G7he host is null.GB

H

#ystem.out.println4G7he port is G L u.getPort4B

#ystem.out.println4G7he path is G L u.getPath4B

#ystem.out.println4G7he ref is G L u.get"ef4B

#ystem.out.println4G7he 9uery string is G L u.get8uery4B

H ?? end try

catch 4alformed(")&ception e& C

#ystem.err.println4argsDiE L G is not a (") I understand.GB

H

#ystem.out.println4B

H ?? end for

H ?? end main

H ?? end (")#plitter

Ot*t

/. Write # *ro$r#m to dis*8#% the soc,et=s *ort #d 6P #ddressPro$r#m

import @a%a.net.AB

import @a%a.io.AB

public class #oc!etInfo

C


C


13/36

for 4int i F 0B i M args.lengthB iLL

C

try

C

#oc!et the#oc!et F new #oc!et4argsDiE* J0B

#ystem.out.println4G/onnected to G L the#oc!et.getInetddress4

L G on port G L the#oc!et.getPort4 L G from port G

L the#oc!et.get)ocalPort4 L G of G L the#oc!et.get)ocalddress4B

H ?? end try

catch 4(n!nown=ost&ception e

C

#ystem.err.println4GI canNt find G L argsDiEB

H

catch 4#oc!et&ception e

C

#ystem.err.println4G/ould not connect to G L argsDiEB

H

catch 4I&ception e

C

#ystem.err.println4eB

H

H ?? end for

H ?? end main

H ?? end #oc!etInfoOt*t

(OR)77dis*8#% soc,et 6etAddress< *ort< 8oc#8*ort #d 8oc#8 #ddress

import @a%a.net.#oc!etB

public class ain/lass C

public static %oid main4#tringDE args throws &ception C

#oc!et the#oc!et F new #oc!et4G12.16J.23.G* J0B

#ystem.out.println4G/onnected to G L the#oc!et.getInetddress4 L G on port G

L the#oc!et.getPort4 L G from port G L the#oc!et.get)ocalPort4 L G of G


14/36

L the#oc!et.get)ocalddress4B

H

H

Ot*t

!. Write # *ro$r#m to sed > Recei9e d#t# from -#t#$r#mP#c,et

Pro$r#m

import @a%a.net.AB

public class -atagram&ample C

public static %oid main4#tringDE args C

#tring s F G7his is a test.GBbyteDE data F s.get$ytes4 B

try C

Inetddress ia F Inetddress.get$y


15/36

import @a%a.io.AB

public class ulticast#niffer

C


C

Inetddress group F nullB

int port F 0B

?? read the address from the command line

try

C

group F Inetddress.get$y


16/36

H

catch 4I&ception e& CH

H

H

H

H

1. Write # *ro$r#m for M8tic#st seder

Pro$r#m

import @a%a.io.AB

public class ulticast#ender

C


C

Inetddress ia F nullB

int port F 0B

byte ttl F 4byte 1B

try

C

ia F Inetddress.get$y


17/36

H ?? end catch

catch 4I&ception e&

C

#ystem.err.println4e&B

H ??end /atch

H ?? nd main

H ?? nd ulticast#ender

'o+ to e:ecte the *ro$r#m

&ecute 6 , O programs

;irst open two command prompts

/ompile , run ulticast#niffer program in one command prompt

?#9#c M8tic#stSiffer.?#9#

?#9# M8tic#stSiffer &3.&!!.&!!.&!!.444

/ompile , run ulticast#ender program in another command prompt separately

?#9#c M8tic#stSeder.?#9#

?#9# M8tic#stSeder &3.&!!.&!!.&!!.444

7hen output shows in ulticast#niffer command prompt as 'ere=s some m8tic#st d#t# is

*rited "4 times

2. Write # *ro$r#m for # Ch#t A**8ic#tio

Oe@Oe B% o*ei$ soc,et coectio #d dis*8#%i$ +h#t is +ritte 5% oe *#rt%

to the other.


18/36

M#%@M#% (Bro#d c#st) E#ch c8iet o*es # soc,et coectio to the ch#t ser9er

#d +rites to the soc,et. Wh#te9er is +ritte 5% oe *#rt% c# 5e see 5% #88 other

*#rties.

Oe@Oe

/lient side Program

import @a%a.io.AB

import @a%a.net.ABimport @a%a.lang.AB

public class chatclient1C

public static %oid main4#tring argsDE

throws I&ception

C#oc!et csoc F nullB

#tring hostB

if4args.length0

hostFargsD0EBelse hostFGlocalhostGB

PrintWriter poutFnullB$uffered"eader binFnullB

try

C

csoc F new #oc!et4host*OBpout F new PrintWriter4csoc.getutput#tream4*trueB

bin F new $uffered"eader4new Input#tream"eader4csoc.getInput#tream4B

Hcatch4(n!nown=ost&ception e

C#ystem.err.println4Gun!nown =ostGB#ystem.e&it41B

H

catch4I&ception eCH$uffered"eader inFnew $uffered"eader4new Input#tream"eader4#ystem.inB

#tring inputB

while4true

Cinput F in.read)ine4B

pout.println4inputB

#tring msgFbin.read)ine4B#ystem.out.println4G#er%er GLmsgB

if4msg.e9uals4G$yeG brea!B

Hin.close4B

pout.close4B

bin.close4B

csoc.close4BH

H

#er%er #ide Program


19/36

import @a%a.io.AB

import @a%a.net.ABimport @a%a.lang.AB

public class chatser%er

Cpublic static %oid main4#tring argsDE

throws I&ception

C#er%er#oc!et ssoc F nullB

tryC

ssoc F new #er%er#oc!et4OB

H

catch4I&ception eC

#ystem.err.println4G


20/36

ssoc.close4B

csoc.close4B

HH

=ow to e&ecute the program


/ompile /lient side program in one command prompt

/ompile #er%er side program in another command prompt separately;irst run the ser%e side program then run the client side program

#end data from client to ser%er and from ser%er to client.

M#%@M#% (Bro#d c#st)

C8iet side Pro$r#m

import @a%a.net.AB

import @a%a.io.AB


21/36

public class m/lient1

C

static #oc!et sFnullB

static #tring nameB

static -ataInput#tream ddB

public static %oid main4#tring argsDEC

tryC

#ystem.out.println4Genter the nameGBddFnew -ataInput#tream4#ystem.inB

nameFdd.read)ine4B

H

catch4&ception e

C

#ystem.err.println4eBH

try

CsFnew #oc!et4GlocalhostG*O21B ?? ip address of the ser%er

cli#end2 csFnew cli#end24sBcs.start4B

/l"ec2 crFnew /l"ec24sB

cr.start4B

H

catch4&ception e

C#ystem.err.println4eB

H

H

H

class cli#end2 e&tends 7hread

C

#oc!et sBstatic PrintWriter pwB

cli#end24#oc!et s throws &ceptionC

this.sFsB

pwFnew PrintWriter4s.getutput#tream4*trueBH

public %oid run4

C

while4trueC

try

C

-ataInput#tream dinFnew -ataInput#tream4#ystem.inB


22/36

#tring str1Fdin.read)ine4B

pw.println4G GLm/lient1.nameLGGLstr1B

Hcatch4&ception eC


H

HH

H

class /l"ec2 e&tends 7hreadC

#oc!et sB

static $uffered"eader brB/l"ec24#oc!et s throws &ception

C

this.sFsB

brFnew $uffered"eader4new Input#tream"eader4s.getInput#tream4BH

public %oid run4

C

tryC

#tring lineFbr.read)ine4Bwhile4lineQFnull

C

#ystem.out.println4lineBlineFbr.read)ine4B

H

Hcatch4&ception e


HHH

Ser9er side Pro$r#m

import @a%a.io.AB

import @a%a.net.AB

public class m#er%er1

Cstatic #oc!et sDEFnew #oc!etD10EB

static int countB

public static %oid main4#tring argsDE throws &ceptionC

#er%er#oc!et ssB

try

CssFnew #er%er#oc!et4O21B

#ystem.out.println4G#er%er "unningGB

#r#end1 srFnew #r#end14B

sr.start4B


23/36

while4true

C

sDcountEFss.accept4B/li#end1 csFnew /li#end14countB

cs.start4B

countLLB

HH

catch4&ception e


H

HH

class /li#end1 e&tends 7hread

C

$uffered"eader brBPrintWriter pwB

#oc!et sB

#tring strB

int cB

/li#end14int cC

?? this.sFsB

this.cFcBtry

C

brFnew $uffered"eader4new

Input#tream"eader44m#er%er1.sDcE.getInput#tream4BHcatch4&ception e

C#ystem.err.println4eBH

H

public %oid run4C

while4true

C

tryC

strFbr.read)ine4B

#ystem.out.println4strBfor4int iF0BiMm#er%er1.countBiLL

C

if4iFFccontinueB

pwFnew PrintWriter4m#er%er1.sDiE.getutput#tream4*trueB

pw.println4strB

HHcatch4&ception e

C


H


24/36

H

H

Hclass #r#end1 e&tends 7hread

C

$uffered"eader brB

#tring strBPrintWriter pwB

#r#end14 throws &ceptionC

brFnew $uffered"eader4new Input#tream"eader4#ystem.inB

H

public %oid run4

C

while4trueC

try

C

strFbr.read)ine4Bfor4int iF0BiMm#er%er1.countBiLL

CpwFnew PrintWriter4m#er%er1.sDiE.getutput#tream4*trueB

pw.println4G#er%erGLstrB

HHcatch4&ception e

C


HH

HH

=ow to e&ecute the program

;irst open three command prompts

/ompile /lient side program in two command prompt

/ompile #er%er side program in one command prompt separately

;irst run the ser%e side program

then run the client side program gi%e a name of the client as &

ne&t run the another client side program gi%e a name of the client as y

#end data from one client V that data %isible in ser%er side and other client side

#end data from ser%er V that data %isible in both client sides

#end data from another client V that data %isible in ser%er side and other client side


25/36"&. Write # *ro$r#m for the Sim*8e fi8e tr#sfer 5et+ee t+o s%stems


26/36

B% o*ei$ soc,et coectio to or ser9er o oe s%stem #d sedi$ # fi8e from oe

s%stem to #other.

C8iet side Pro$r#m

import @a%a.net.AB

import @a%a.io.AB

public class ftpclientC

public static %oid main4#tring argsDEC#oc!et sB

$uffered"eader in*brB

PrintWriter pwB#tring spath*dpathB

;ileutput#tream fosB

int cB

tryC sFnew #oc!et4GlocalhostG*1111B

inFnew $uffered"eader4new Input#tream"eader4#ystem.inB

brFnew $uffered"eader4new Input#tream"eader 4s.getInput#tream4B

pwFnew PrintWriter4s.getutput#tream4*trueB#ystem.out.println4GKn nter source file to be copiedGB

spathFin.read)ine4B#ystem.out.println4GKn nter -estination Path to 7ransferGB

dpathFin.read)ine4B

fosFnew ;ileutput#tream4dpathBpw.println4spathB

while44cFbr.read4QF1C

fos.write44charcB

fos.flush4BH

#ystem.out.println4G;ile 7ransfer /ompletedGBHcatch4&ception eC

#ystem.out.println4eB

HH

H

Ser9er side Pro$r#m

import @a%a.net.AB

import @a%a.io.ABpublic class ftpser%erC

public static %oid main4#tring argsDEC

#oc!et sB#er%er#oc!et ser%erB

$uffered"eader brB

PrintWriter pwB

#tring filenameB;ileInput#tream fisB

int cB

tryC

ser%erFnew #er%er#oc!et41111B


27/36

#ystem.out.println4G#er%er Waiting for /onnectionKnGB

sFser%er.accept4B

#ystem.out.println4G/onnection stablishedKnGBbrFnew $uffered"eader4new Input#tream"eader 4s.getInput#tream4B

pwFnew PrintWriter4s.getutput#tream4B

filenameFbr.read)ine4B

fisFnew ;ileInput#tream4filenameBwhile44cFfis.read4QF1C

pw.print44charcB

pw.flush4BH

#ystem.out.println4filename L Gcopied to destinationGB

s.close4BH

catch4&ception eC

#ystem.out.println4eB

HH

H


;irst open two command prompts/ompile and run #er%er side program in one command prompt

/ompile and run /lient side program in another window

nter source file to be copied

nter new name to sa%e that data

7hat new file automatically created and copied and located in same location of source program

". Write # *ro$r#m for the TFTP@C8iet. To de9e8o* # TFTP c8iet for fi8e tr#sfer.


28/36

C8iet side Pro$r#m

import @a%a.io.ABimport @a%a.net.AB

import @a%a.lang.AB

public class tftpc

C public static %oid main4#tring argsDE throws &ception

C

-atagram#oc!et dsFnew -atagram#oc!et41501B $uffered"eader inputFnew $uffered"eader4new Input#tream"eader4#ystem.inB

#ystem.out.println4Genter file to sa%eGB

#tring fileFinput.read)ine4B ;ileutput#tream fosFnew ;ileutput#tream4fileB

#ystem.out.println4Genter file to transGB

fileFinput.read)ine4B

byte sDEFnew byteDfile.length4EB sFfile.get$ytes4B

#tring dataFnullB

ds.send4new -atagramPac!et4s*s.length*Inetddress.get)ocal=ost4*1500B

while4true

C sFnew byteD102EB

-atagramPac!et dpFnew -atagramPac!et4s*102B

ds.recei%e4dpB dataFnew #tring4dp.get-ata4*0*dp.get)ength4B

if4data.e9uals4GAAAG brea!B

fos.write4data.get$ytes4B

H fos.close4B

ds.close4B HH

Ser9er side Pro$r#m

import @a%a.io.AB

import @a%a.net.AB

import @a%a.lang.ABpublic class tftps

C

public static %oid main4#tring argsDE throws &ception C

-atagram#oc!et dsFnew -atagram#oc!et41500B

byte sDEFnew byteD102EB -atagramPac!et dpFnew -atagramPac!et4s*102B

ds.recei%e4dpB

#ystem.out.println4G/lient /onnectedGB

#tring dataFnew #tring4dp.get-ata4*0*dp.get)ength4B int countF0B

#ystem.out.println4G7ransferredGB

;ileInput#tream fsFnew ;ileInput#tream4dataB

while4fs.a%ailable4QF0


29/36

C

if4fs.a%ailable4M102 countFfs.a%ailable4B

else countF102B sFnew byteDcountEB

fs.read4sB

dpFnew -atagramPac!et4s*s.length*Inetddress.get)ocal=ost4*1501B

ds.send4dpB H

fs.close4B

sFnew byteD3EB sFGAAAG.get$ytes4B

ds.send4new -atagramPac!et4s*s.length*Inetddress.get)ocal=ost4*1501B

ds.close4B H

H



/ompile and run #er%er side program in one command prompt

/ompile and run /lient side program in another window

nter file to be sa%e 4new name

nter file to transfer 4e&isting file

7hat new file automatically created and copied and located in same location of source program

"/. Write # *ro$r#m for the 'TTP@Ser9er

-e9e8o* # 'TTP ser9er to im*8emet the fo88o+i$ comm#ds ;ET< POST< 'EA-

cn lab programs

Documents