i'm doing a simple program in socket programming on c i have server that can handle 2clients in a single machine i'm running ubuntu linux so i got it work but the probelm when clients send a message the server will echo it but i cant distinguish which client send the message client 1 or client 2 here is the code for the server whenever a client sent a message it will be shown in the server side as( client sent : hi)i cant know which client sent it please help
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#define BUFFER_SIZE 1024
int serverfd;
int clientfd;
int n;
int addrSize;
int serverPort;
char clientIP[25];
char buffer[BUFFER_SIZE];
struct sockaddr_in serverAddr;
struct sockaddr_in clientAddr;
int main(int argc, char* argv[])
{
if(argc < 2)
{
printf("Usage: ./server <port>\n");
exit(0);
}
else
{
serverPort = atoi(argv[1]);
}
addrSize = sizeof(struct sockaddr);
/* Create a TCP socket */
serverfd = socket(AF_INET, SOCK_STREAM, 0);
if(serverfd < 0)
printf("Error creating server socket");
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(serverPort); /* Specify a port */
serverAddr.sin_addr.s_addr = INADDR_ANY; /* Accept connections from anywhere */
memset(&(serverAddr.sin_zero), '\0', 8); /* This must be set to zero */
/* Bind our server socket */
if(bind(serverfd, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr)) == -1)
printf("Could not bind()\n");
/* Start listening on socket for incoming connections */
if(listen(serverfd, 10) == -1)
printf("Could not listen()\n");
fork();//this is the magical line...
/* accept() accepts an incoming connection and fills a sockaddr_in structure with client information */
clientfd = accept(serverfd, (struct sockaddr*)&clientAddr, &addrSize);
/* inet_ntoa() converts an IP address to a displayable string */
snprintf(clientIP, sizeof(clientIP), "%s", inet_ntoa(clientAddr.sin_addr));
printf("Got connection from %s\n", clientIP);
do
{
n = recv(clientfd, buffer, BUFFER_SIZE, 0); /* Receive message from client */
buffer[n] = '\0'; /* terminate string */
send(clientfd, buffer, BUFFER_SIZE, 0); /* Echo message back to client */
printf("Client sent: %s\n" , buffer);
}
while(strncmp(buffer, "exit", 4) != 0); /* Exit when client sends "exit" */
close(serverfd); /* Close socket */
return 0;
}
and this is the client.c code
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include
<arpa/inet.h>
#include
<sys/types.h>
#include
<sys/socket.h>
#define
BUFFER_SIZE 1024
int sockfd;
int n;
int addrSize;
int serverPort;
char serverIP[25];
char
buffer[BUFFER_SIZE];
struct sockaddr_in serverAddr;
int main(int argc, char* argv[])
{
if(argc < 3)
{
printf("Usage: ./client <server ip> <server port>\n");
exit(0);
}
else
{
snprintf(serverIP, sizeof(serverIP), "%s", argv[1]);
serverPort = atoi(argv[2]);
}
addrSize = sizeof(struct sockaddr);
/* Create a TCP socket */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
printf("Error creating socket");
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(serverPort); /* Server port */
inet_pton(AF_INET, serverIP, &serverAddr.sin_addr); /* Server IP Address */
memset(&(serverAddr.sin_zero), '\0', 8); /* This must be set to zero */
/* Connect to server */
if(connect(sockfd, (struct sockaddr*)&serverAddr, addrSize) != 0)
{
printf("Error: Could not connect to %s on port %d\n", serverIP, serverPort);
exit(0);
}
else
printf("Connected to %s on port %d\n\n", serverIP, serverPort);
do
{
printf("> ");
fgets(buffer, BUFFER_SIZE, stdin);
send(sockfd, buffer, strlen(buffer), 0); /* Send message to server */
n = recv(sockfd, buffer, BUFFER_SIZE, 0); /* Receive message from server */
buffer[n] = '\0'; /* terminate string */
printf("< %s\n", buffer);
}
while(strncmp(buffer, "exit", 4) != 0); /* Exit when message is "exit" */
close(sockfd); /* Close socket */
return 0;
}
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