Linux & C :- File transfer application using Sockets

Code for Client

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<fcntl.h>

int main(int argc,int *argv[])
{

char buffer[100];
int fd=open("abc.txt",O_RDONLY);
read(fd,buffer,100);



int sock_id=socket(AF_INET,SOCK_STREAM,0);
if(sock_id<0)
{
printf("Error in getting socket\n");
return 0;
}

struct sockaddr_in clientstruct;
clientstruct.sin_family=AF_INET;
clientstruct.sin_addr.s_addr=inet_addr("127.0.0.1");
clientstruct.sin_port=10125;

int ret=connect(sock_id,(struct sockaddr *)&clientstruct,sizeof(clientstruct));


write(sock_id,buffer,100);




close(sock_id);



return 0;
}

Code for Server

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<fcntl.h>

int main()

{

char buffer[100];

int session_id;

int server_id=socket(AF_INET,SOCK_STREAM,0);

if(server_id<0)

{

printf("Error in getting socket\n");

return 0;

}

struct sockaddr_in serverstruct,clientstruct;

serverstruct.sin_family=AF_INET;

serverstruct.sin_addr.s_addr=inet_addr("127.0.0.1");

serverstruct.sin_port=10125;

int i=bind(server_id,(struct sockaddr*)&serverstruct,sizeof(serverstruct));

if(i<0)

{

printf("Error in bind\n");

return 0;

}

i=listen(server_id,10);

if(i<0)

{

printf("Error in listening\n");

return 0;

}

int client_len=sizeof(serverstruct);

while(1)

{

int fd=open("target.txt",O_WRONLY);

if(fd<0)

{

printf("file cant be iopened\n");

}

printf("Waiting for the client\n");

session_id=accept(server_id,(struct sockaddr*)&serverstruct,&client_len);

read(session_id,buffer,sizeof(buffer));

write(fd,buffer,100);

printf("From CLIENT:%s\n",buffer);

close(fd);

close(session_id);

}

close(server_id);

return 0;

}