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

#define MAX_BUFFER_SIZE 1024
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 8080

int main() {
    // ½¨Éè UDP socket
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        perror("Failed to create socket");
        exit(EXIT_FAILURE);
    }

    // ¹¹½¨Ð§ÀÍÆ÷µØµã½á¹¹
    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);

    // ·¢ËÍÊý¾Ý
    char buffer[MAX_BUFFER_SIZE] = "Hello, UDP Server!";
    sendto(sock, buffer, strlen(buffer), 0, (struct sockaddr*)&server_addr, sizeof(server_addr));

    // ¹Ø±Õ socket
    close(sock);

    return 0;
}

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

#define MAX_BUFFER_SIZE 1024
#define SERVER_PORT 8080

int main() {
    // ½¨Éè UDP socket
    int sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        perror("Failed to create socket");
        exit(EXIT_FAILURE);
    }

    // °ó¶¨Ð§ÀÍÆ÷µØµã
    struct sockaddr_in server_addr, client_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    if (bind(sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
        perror("Failed to bind address");
        exit(EXIT_FAILURE);
    }

    // ÎüÊÕÊý¾Ý
    char buffer[MAX_BUFFER_SIZE];
    int addr_len = sizeof(client_addr);
    int recv_len = recvfrom(sock, buffer, MAX_BUFFER_SIZE, 0, (struct sockaddr*)&client_addr, &addr_len);
    if (recv_len < 0) {
        perror("Failed to receive data");
        exit(EXIT_FAILURE);
    }

    printf("Received data from client: %s
", buffer);

    // ¹Ø±Õ socket
    close(sock);

    return 0;
}

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