tcp_svr.c

一个基于linux的TCP/IP协议栈的实现

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>

#include "my_inet.h"

int main()
{
	int server_sockfd, client_sockfd;
	int server_len, client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;

	server_sockfd = socket( MY_AF_INET, SOCK_STREAM, MY_IPPROTO_TCP );

	server_address.sin_family = MY_AF_INET;
	server_address.sin_addr.s_addr = inet_addr("172.16.48.13");
	server_address.sin_port = htons(5002);
	server_len = sizeof(server_address);

	int option = 2;
	if( setsockopt( server_sockfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option) ) < 0 ){
		perror("setsockopt: ");
		return -1;
	}

	if( bind( server_sockfd, (struct sockaddr *)&server_address, server_len ) < 0 ){
		perror("bind: ");
		return -1;
	}

	if( listen( server_sockfd, 5 ) < 0 ){
		perror("listen: ");
		return -1;
	}
	while(1){
		char buf[4096];
		printf("server waiting\n");
		client_len = sizeof( client_address );
		client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len );
		read( client_sockfd, buf, sizeof(buf) );
		printf("the rcv: %s\n", buf );
		//snprintf( buf, sizeof(buf), "I received you packet! thank you!\n");
		printf("%s\n", buf );
		write( client_sockfd, buf, strlen(buf) );
		close(client_sockfd);
	}
}