Upload and download data Using TCP IP Protocol

Question: client needs to send request to server, then server respond to the client request. Implement this method using TCP IP Protocol

TCPIP Client Upload and download data Program

#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret,i,j;
socklen_t len;
char buf[80],ch;
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_STREAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[2]));
sAddr.sin_addr.s_addr=inet_addr(argv[1]);
if(connect(sd,(struct sockaddr *)&sAddr,sizeof(sAddr))==-1)
{
perror("connect");
return;
}
printf("connect successful\n");
printf("enter name of file to download...\n");
gets(buf);
ret=send(sd,buf,strlen(buf),0);
if(ret==-1)
{
perror("send");
return;
}
printf("file name send successfully...\n");

while(recv(sd,buf,80,0))
{
if(strcmp(buf,"complete")==0) 
break;
else{
printf("received: %s\n",buf);

}
}
printf("message downloaded successfully...\n");
close(sd);
}

TCPIP Server Upload Download data Program

#include<stdio.h>
#include<sys/ipc.h>
#include<sys/socket.h>
#include<sys/stat.h>
#include<stdlib.h>
#include<netinet/in.h>
#include<string.h>
main(int argc,char **argv)
{
int sd,newsd,ret,j,pos;
socklen_t len;
char buf[20],ch,str[80];
struct sockaddr_in cAddr,sAddr;
sd=socket(PF_INET,SOCK_STREAM,0);
if(sd==-1)
{
perror("socket");
return;
}
sAddr.sin_family=PF_INET;
sAddr.sin_port=htons(atoi(argv[1]));
sAddr.sin_addr.s_addr=inet_addr("0.0.0.0");
if(bind(sd,(struct sockaddr *)&sAddr,sizeof(sAddr))==-1)
{
perror("bind");
return;
}
printf("bind successful....\n");
listen(sd,5);
len=sizeof(cAddr);
printf("waiting for client request...\n");
newsd=accept(sd,(struct sockaddr *)&cAddr,&len);
if(newsd==-1)
{
perror("accept");
return;
}
printf("connection accepted\n");

printf("waiting for file name from client...\n");
bzero(buf,20);
recv(newsd,buf,20,0);
FILE *fp;
fp=fopen(buf,"r");
if(fp==NULL)
{
printf("file cannot be opened..\n");
return;
}
fseek(fp,0,2);
pos=ftell(fp);
printf("size=%d\n",pos);
rewind(fp);
int i=0;
/*while((ch=fgetc(fp))!=EOF)
{
str[i]=ch;
i++;
}*/
while((fgets(str,80,fp))!=NULL)
ret=send(newsd,str,strlen(str),0);
//ret=send(newsd,str,strlen(str),0);
if(ret==-1)
{
perror("send");
return;
}
strcpy(str,"complete");
ret=send(newsd,str,strlen(str),0);
printf("send successfull...\n");
//printf("received: %s\n",buf);
close(sd);
close(newsd);
}

Categories: Network Programming, TCPIP