sisiServer.c

// Nama : Raviqa Sandra Putri
// Nim  : 1856401009

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

#define MAXBUF 1024

int main(int argc, char *argv[]){
    int udpSocket;
    int returnStatus = 0, returnStatus1 = 0;
    int addrlen = 0;
    struct sockaddr_in udpServer, udpClient;
    char buf[MAXBUF];
    char buf1[MAXBUF];

    if(argc < 2){
        fprintf(stderr, "Usage : %s <port>\n", argv[0]);
        exit(1);
    }

    udpSocket = socket(AF_INET, SOCK_DGRAM,0);

    if(udpSocket == -1) {
        fprintf(stderr, "Could not create a socket !\n");
        exit(1);
    }else{
        printf("Socket Create\n");
    }

    udpServer.sin_family = AF_INET;
    udpServer.sin_addr.s_addr = htonl(INADDR_ANY);

    udpServer.sin_port = htons(atoi(argv[1]));
    returnStatus = bind(udpSocket, (struct sockaddr*)&udpServer, sizeof(udpServer));

    if(returnStatus == 0){
        fprintf(stderr, "Bind Complate\n");
    } else {
        fprintf(stderr, "Could not bind to address!\n");
        close(udpSocket);
        exit(1);
    }

    while(1){
    addrlen = sizeof(udpClient);
    returnStatus = recvfrom(udpSocket, buf, MAXBUF,0,(struct sockaddr*)&udpClient, &addrlen);
    returnStatus1 = recvfrom(udpSocket, buf1, MAXBUF,0,(struct sockaddr*)&udpClient, &addrlen);
    if(returnStatus == -1 && returnStatus1 == -1){
        fprintf(stderr, "Could not receive message!\n");
    }
    else {
        printf("Received Username : %s\n",buf);
        printf("Received Password : %s\n",buf1);
        //printf("login Berhasil!\n");
        if(strcmp(buf, "auliya") == 0 && strcmp(buf1, "rahmi") == 0){
            strcpy(buf, "Login Berhasil\n");
            returnStatus = sendto(udpSocket, buf, strlen(buf)+1, 0, (struct sockaddr*)&udpClient, sizeof(udpClient));
            if(returnStatus == -1){
                fprintf(stderr, "Could not sent confirmation!\n");
            }
            else {
            printf("confirmation success sent.\n");
            }
        }
        else {
        strcpy(buf, "Gagal connect to server");
        returnStatus = sendto(udpSocket, buf, strlen(buf)+1, 0, (struct sockaddr*)&udpClient, sizeof(udpClient));
        if(returnStatus == -1 ){
            fprintf(stderr, "Could not send confirmation!\n");
        }
        else{
            printf("confirmation Failure sent.\n");

        }
    }

}
    }
    close(udpSocket);
    return 0;

}