Notes

server

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

int main(){
int welcomeSocket, newSocket, portNum, clientLen, nBytes;
char buffer[1024],sz[50];
struct sockaddr_in serverAddr;
struct sockaddr_storage serverStorage;
socklen_t addr_size;
int i;

welcomeSocket = socket(PF_INET, SOCK_STREAM, 0);

portNum = 7891;

serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(portNum);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
memset(serverAddr.sin_zero, '', sizeof serverAddr.sin_zero);

bind(welcomeSocket, (struct sockaddr *) &serverAddr, sizeof(serverAddr));

if(listen(welcomeSocket,5)==0)
printf("Listeningn");
else
printf("Errorn");

addr_size = sizeof serverStorage;

/*loop to keep accepting new connections*/
while(1){
newSocket = accept(welcomeSocket, (struct sockaddr *) &serverStorage, &addr_size);
/*fork a child process to handle the new connection*/
if(!fork()){
nBytes = 1;
/*loop while connection is live*/
while(nBytes!=0){
nBytes = recv(newSocket,buffer,1024,0);
FILE *fp;
int size = 0;
fp = fopen(buffer, "r");
if (fp == NULL)
printf("nFile unable to open ");
else
printf("nFile opened : %sn",buffer);
fseek(fp, 0, 2); /* file pointer at the end of file */
size = ftell(fp)-1; /* take a position of file pointer un size variable */
snprintf (sz, sizeof(sz), "%d",size);
printf("The size of given file is : %dn", size);
fclose(fp);
send(newSocket,sz,nBytes,0);
}
close(newSocket);
exit(0);
}
/*if parent, close the socket and go back to listening new requests*/
else{
close(newSocket);
}
}

return 0;
}



client

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

int main(){
int clientSocket, portNum, nBytes;
char buffer[1024];
struct sockaddr_in serverAddr;
socklen_t addr_size;

clientSocket = socket(PF_INET, SOCK_STREAM, 0);

portNum = 7891;

serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(portNum);
serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
memset(serverAddr.sin_zero, '', sizeof serverAddr.sin_zero);

addr_size = sizeof serverAddr;
connect(clientSocket, (struct sockaddr *) &serverAddr, addr_size);

while(1){
printf("Type a file name to send to server: ");
scanf("%s",buffer);
//printf("You typed: %s",buffer);

nBytes = strlen(buffer) + 1;

send(clientSocket,buffer,nBytes,0);

recv(clientSocket, buffer, 1024, 0);

printf("Size of file received from server: %snn",buffer);
}

return 0;
}