linux下socket編程(udp)

服務器端:

/*
  * File Name: socket_udp_server.c
  * Author: eagle
  * mail: [email protected]
  * Created Time: 2015-10-08 18:43
 */

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

int main(int argc, char *argv[])
{
	int server_socketfd, client_socketfd;
	int server_len,client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;
	int i,byte;
	char recv[100], send[100];
//char recv, send;
	/*hostip 本機ip地址*/
	int inet_sock;
	struct ifreq ifr;
	char hostip[15];
	inet_sock = socket(AF_INET, SOCK_DGRAM,0);
	strcpy(ifr.ifr_name, "wlan0");
	if (ioctl(inet_sock, SIOCGIFADDR, &ifr) < 0)
		perror("ioctl");
	strcpy(hostip, inet_ntoa(((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr));
	/*上面部分爲獲取本機ip*/

	server_socketfd = socket(AF_INET, SOCK_DGRAM, 0); //創建socket對象
	server_address.sin_family = AF_INET;              
	server_address.sin_addr.s_addr = inet_addr("192.168.1.102"); //主機ip
	server_address.sin_port = 9734;                     //主機端口
	server_len = sizeof(server_address);
	bind(server_socketfd, (struct sockaddr *) & server_address, server_len);

/*	if((byte = recvfrom(server_socketfd, &recv, sizeof(recv), 0,  //從客戶端接受消息
					(struct sockaddr *)&client_address, //存儲客戶端地址信息
					(socklen_t *)&client_len)) == -1)
	{
	    perror("recvfrom");
		exit(EXIT_FAILURE);
	}
	printf("recv:%s\n", recv);
*/
	/*client_address.sin_family = AF_INET;                   
	client_address.sin_addr.s_addr = inet_addr("192.168.1.108"); //主機ip               //這一段可以不寫,上面已經接收了
	client_address.sin_port = 9735;                     //主機端口  */                   //客戶端地址信息,直接發送即可
while(1){
	if((byte = recvfrom(server_socketfd, &recv, sizeof(recv), 0,  //從客戶端接受消息
					(struct sockaddr *)&client_address, //存儲客戶端地址信息
					(socklen_t *)&client_len)) == -1)
	{
	    perror("recvfrom");
		exit(EXIT_FAILURE);
	}
	printf("recv:%s\n", recv);
	//fflush(stdin);
	//fflush(stdout);
	printf("send:");
	scanf("%s", send);
	if((byte = sendto(server_socketfd, &send, sizeof(send), 0, 
					(struct sockaddr *)&client_address,
					(socklen_t)client_len)) == -1)
	{
		perror("send");
		exit(EXIT_FAILURE);
	}
}
	shutdown(client_socketfd, 2);
	shutdown(server_socketfd, 2);
	return 0;
}

客戶端:

/*
  * File Name: socket_udp_server.c
  * Author: eagle
  * mail: [email protected]
  * Created Time: 2015-10-08 18:43
 */

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

int main(int argc, char *argv[])
{
	int socketfd;
	int server_len,client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;
	int i,byte;
	char recv[100], send[100];
//char recv, send;
	/*hostip 本機ip地址*/
	/*int inet_sock;
	struct ifreq ifr;
	char hostip[15];
	inet_sock = socket(AF_INET, SOCK_DGRAM,0);
	strcpy(ifr.ifr_name, "wlan0");
	if (ioctl(inet_sock, SIOCGIFADDR, &ifr) < 0)
		perror("ioctl");
	strcpy(hostip, inet_ntoa(((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr));
*/	/*上面部分爲獲取本機ip*/

	socketfd = socket(AF_INET, SOCK_DGRAM, 0); //創建socket對象
	server_address.sin_family = AF_INET;              
	server_address.sin_addr.s_addr = inet_addr("192.168.1.102"); //主機ip
	server_address.sin_port = 9734;                     //主機端口
    server_len = sizeof(server_address);
	
	
	client_address.sin_family = AF_INET;              
	client_address.sin_addr.s_addr = inet_addr("192.168.1.108"); //主機ip
	client_address.sin_port = 9735;                     //主機端口
	client_len = sizeof(client_address);
	bind(socketfd, (struct sockaddr *) & client_address, client_len);

while(1){
	printf("send:");
	scanf("%s", send);
	if((byte = sendto(socketfd, &send, sizeof(send), 0, 
					(struct sockaddr *)&server_address,
					(socklen_t)server_len)) == -1)
	{
		perror("send");
		exit(EXIT_FAILURE);
	}

	if((byte = recvfrom(socketfd, &recv, sizeof(recv), 0,  //從客戶端接受消息
					(struct sockaddr *)&server_address, //存儲客戶端地址信息
					(socklen_t *)&server_len)) == -1)
	{
		perror("recvprom");
		exit(EXIT_FAILURE);
	}
	printf("recv:%s", recv);
}
	shutdown(socketfd, 2);
	return 0;
}