IMPLEMENTATION OF TCP (Transmission Control Protocol) Source Code in C Language

PROGRAM:

CLIENT ( Type This cilent Program in The Editor ):

#include
#include
#include
#include
#include
#include
#include
int main(int argc,char **argv)
{
struct sockaddr_in saddr;
struct hostent *server;
int n,i,ssid,csid,pid;
char buffer[1024];
if(argc<2)
fprintf(stderr,"port # not specified\n");
csid=socket(AF_INET,SOCK_STREAM,0);
if(csid<0)
perror("socket failed error");
bzero((char*)&saddr,sizeof(saddr));
server=gethostbyname(argv[1]);
saddr.sin_family=AF_INET;
saddr.sin_port=htons(atoi(argv[2]));
bcopy((char*)server->h_addr,(char*)&saddr.sin_addr.s_addr,server->h_length);
ssid=connect(csid,(struct sockaddr*)&saddr,sizeof(saddr));
if(ssid<0)
perror("socket connect error");
bzero(buffer,1024);
printf("Type msg to server");
fgets(buffer,1024,stdin);
n=write(csid,buffer,sizeof(buffer));
if(n==0)
perror("Socket write error");
n=read(csid,buffer,sizeof(buffer));
perror("Socket read buffer");
printf("msg from server :\n");
for(i=0;iprintf("%c",buffer[i]);
return 0;
}


SERVER:

#include
#include
#include
#include
#include
int main(int argc,char **argv)
{
struct sockaddr_in saddr,caddr;
int n,len,ssid,csid,pid;
char buffer[1024];
if(argc<2)
fprintf(stderr,"port # not specified\n");
ssid=socket(AF_INET,SOCK_STREAM,0);
if(ssid<0)
perror("Socket failed error");
bzero((char*)&saddr,sizeof(saddr));
saddr.sin_family=AF_INET;
saddr.sin_port=htons(atoi(argv[1]));
saddr.sin_addr.s_addr=INADDR_ANY;
if(bind(ssid,(struct sockaddr*)&saddr,sizeof(saddr))<0)
perror("Socket bind error");
listen(ssid,5);
len=sizeof(caddr);
csid=accept(ssid,(struct sockaddr*)&caddr,&len);
if(csid<0)
perror("socket accept error");
bzero(buffer,1024);
n=read(csid,buffer,1024);
if(n==0)
perror("Socket read error");
printf("msg from client:%s\n",buffer);
n=write(csid,buffer,1024);
if(n<0)
perror("write error");
return 0;
}









OUTPUT:

IN SERVER:
[testciet @linuxcentre ~]$ cc tcpserver.c
[testciet @linuxcentre ~]$ ./a.out 1678
Msg from client: hi

IN CLIENT:
[testciet @linuxcentre ~]$ cc tcpclient.c
[testciet @linuxcentre ~]$ ./a.out localhost 1678
Type msg to server:hi
Socket read buffer: Success
msg from server :
hi


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