#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<arpa/inet.h>

#include<unistd.h>

#include<stdlib.h>

#include<stdio.h>

#include<string.h>

#include<netdb.h>

#include<errno.h>

#define PORT 8888

#define MAX_MSG_SIZE 1024

int main(void)

{

	int sockfd, addrlen, n;

	struct sockaddr_in addr;

	char msg[MAX_MSG_SIZE];

	sockfd = socket(AF_INET, SOCK_DGRAM, 0);

	if (sockfd < 0)

	{

		fprintf(stderr, "socket failed\n");

		exit(EXIT_FAILURE);

	}

	addrlen = sizeof(struct sockaddr_in);

	bzero(&addr, addrlen);

	addr.sin_family = AF_INET;

	addr.sin_addr.s_addr = htonl(INADDR_ANY);

	addr.sin_port = htons(PORT);

	if (bind(sockfd, (struct sockaddr*)(&addr), addrlen) < 0)

	{

		fprintf(stderr, "bind fail\n");

		exit(EXIT_FAILURE);

	}

	puts("bind success");

	while (1)

	{

		bzero(msg, MAX_MSG_SIZE);

		n = recvfrom(sockfd, msg, sizeof(msg), 0, (struct sockaddr *)(&addr), &addrlen);

		fprintf(stdout, "Recevie message from client is %s\n", msg);

		fgets(msg, MAX_MSG_SIZE,stdin);

		printf("Server endpoint input message %s\n", msg);

		sendto(sockfd, msg, n, 0,(struct sockaddr *)(&addr), addrlen);

	}

	close(sockfd);

	exit(EXIT_SUCCESS);

}

#include<stdio.h>

#include<unistd.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

#include<string.h>

#define MAX_BUF_SIZE 1024

#define PORT 8888

int main()

{

	int sockfd, addrlen, n;

	char buffer[MAX_BUF_SIZE];

	struct sockaddr_in addr;

	sockfd = socket(AF_INET, SOCK_DGRAM, 0);

	if (sockfd < 0)

	{

		fprintf(stderr, "socket falied\n");

		exit(EXIT_FAILURE);

	}

	addrlen = sizeof(struct sockaddr_in);

	bzero(&addr, addrlen);

	addr.sin_family = AF_INET;

	addr.sin_port = htons(PORT);

	addr.sin_addr.s_addr = htonl(INADDR_ANY);

	puts("socket success");

	while(1)

	{

		bzero(buffer, MAX_BUF_SIZE);

		fgets(buffer, MAX_BUF_SIZE, stdin);

		sendto(sockfd, buffer, strlen(buffer), 0, (struct sockaddr *)(&addr), addrlen);

		printf("client send msg is %s\n", buffer);

		n = recvfrom(sockfd, buffer, strlen(buffer), 0, (struct sockaddr *)(&addr), &addrlen);

		fprintf(stdout, "clinet Receive message from server is %s\n", buffer);

	}

	close(sockfd);

	exit(0);

	return 0;

}