SLIDING WINDOW PROTOCOL USING SOCKETS
By karthick
, in
IMPLEMENTATION OF SLIDING WINDOW PROTOCOL USING SOCKETS
,
9 Comments
SERVER PROGRAM
#include
<sys/types.h>
#include
<netinet/in.h>
#include
<netdb.h>
#include
<stdio.h>
#include
<string.h>
#include
<stdlib.h>
#include
<unistd.h>
#include
<errno.h>
int
main()
{
int sock,size,connect;
char senddata[50],data[50];
int val,count,i,port;
struct sockaddr_in ser,cli;
printf("\n\n Server Running ......
");
if ((sock = socket(AF_INET,
SOCK_STREAM, 0)) == -1)
{
perror("\n Socket Creation
Error");
exit(-1);
}
printf("\nEnter the port
number : ");
scanf("%d",&port);
ser.sin_family = AF_INET;
ser.sin_port = htons(port);
ser.sin_addr.s_addr=INADDR_ANY;
bzero(&(ser.sin_zero),8);
if(bind(sock,(struct
sockaddr *)&ser,sizeof(struct sockaddr)) == -1)
{
perror("\n\t Error in
Bind");
exit(-1);
}
if
(listen(sock,2)==-1)
{
perror("\n\t Error in
Listen");
exit(-1);
}
printf("\n\t
Waiting for connection ");
size=sizeof(struct sockaddr);
connect=accept(sock,(struct sockaddr
*)&cli,&size);
if(connect==-1)
{
perror("\n\t Connection Failed
:");
exit(-1);
}
printf("\n\t Connected
Successfully");
printf("\n");
// get the pocket number from client
recv(connect,&val,sizeof(val),0);
count=val;
while(1)
{
i=recv(connect,&data,sizeof(data),0);
data[i]='\0';
if
(strcmp(data,"end")==0)
{
printf("\n\t
Finished");
break;
}
if(count!=val)
{
strcpy(senddata,"packet
missing");
send(connect,&count,sizeof(count),0);
send(connect,senddata,strlen(senddata),0);
}
else
{
printf("\n The packet Number
is : %d",val);
printf("\n The data is
:%s",data);
count++;
strcpy(senddata,"send
nextdata");
send(connect,&count,sizeof(count),0);
send(connect,senddata,strlen(senddata),0);
}
printf("\n The Expected Packet now
is: %d \n",count);
recv(connect,&val,sizeof(val),0);
}
close(connect);
close(sock);
return
0;
}
CLIENT PROGRAM
#include
<sys/types.h>
#include
<netinet/in.h>
#include
<arpa/inet.h>
#include
<netdb.h>
#include
<stdio.h>
#include
<string.h>
#include
<stdlib.h>
#include
<unistd.h>
#include
<errno.h>
int
main()
{
int sock,val,i,count,port;
char recvdata[50],sentdata[50];
struct sockaddr_in server_addr;
printf("\n\n Client Running ......
");
if ((sock = socket(AF_INET,
SOCK_STREAM, 0)) == -1)
{
perror("Socket");
exit(1);
}
printf("\nEnter the port
number");
scanf("%d",&port);
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
server_addr.sin_addr.s_addr=
htonl(INADDR_ANY);
bzero(&(server_addr.sin_zero),8);
if (connect(sock, (struct sockaddr
*)&server_addr, sizeof(struct sockadd
r))
== -1)
{
perror("Connect");
exit(1);
}
while(1)
{
//get the pack number from
client
printf("\n Enter packet
number ");
scanf("%d",&val);
// sent the value to server
send(sock,&val,sizeof(val),0);
// get the data from the user
printf("\n\n Enter data
");
scanf("%s",sentdata);
// sent the to server
send(sock,sentdata,strlen(sentdata),0);
if(strcmp(sentdata,"end")==0)
break;
// recev the result from server
recv(sock,&count,sizeof(count),0);
i=recv(sock,recvdata,50,0);
recvdata[i]='\0';
printf("\n %s
%d",recvdata,count);
}
close(sock);
return 0;
}
OUTPUT
SERVER
[11ca013@mcalinux
network]$ cc 17slideser.c
[11ca013@mcalinux
network]$ ./a.out
Server Running ......
Enter
the port number : 3326
Waiting for connection
Connected Successfully
The packet Number is : 18
The data is :google
The Expected Packet now is: 19
The packet Number is : 19
The data is :yahoo
The Expected Packet now is: 20
The Expected Packet now is: 20
The packet Number is : 20
The data is :ok
The Expected Packet now is: 21
CLIENT
[11ca013@mcalinux
network]$ cc 17slidecli.c
[11ca013@mcalinux
network]$ ./a.out
Client Running ......
Enter
the port number3326
Enter packet number 18
Enter data google
send nextdata 19
Enter packet number 19
Enter data yahoo
send nextdata 20
Enter packet number 26
Enter data hi
packet missing 20
Enter packet number 20
Enter data ok
