sisiClient.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 <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define MAXBUF 1024

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

    if(argc < 5){
        fprintf(stderr, "Usage: %s <ip address> <port> <username> <password>\n", argv[0]);
        exit(1);
    }

    udpSocket = socket(AF_INET, SOCK_DGRAM, 0);

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

    udpClient.sin_family = AF_INET;
    udpClient.sin_addr.s_addr = INADDR_ANY;
    udpClient.sin_port =  0;

    returnStatus = bind(udpSocket, (struct sockaddr*)&udpClient, sizeof(udpClient));

    if(returnStatus == 0 ){
        fprintf(stderr, "Bind Completed!\n");
    } else {
        fprintf(stderr, "Could not bind to address!\n");
        close(udpSocket);
        exit(1);
    }
    udpServer.sin_family = AF_INET;
    udpServer.sin_addr.s_addr = inet_addr(argv[1]);
    udpServer.sin_port = htons(atoi(argv[2]));
    strcpy(buf, argv[3]);
    returnStatus = sendto(udpSocket, buf, strlen(buf)+1, 0, (struct sockaddr*)&udpServer, sizeof(udpServer));
    strcpy(buf1, argv[4]);
    returnStatus = sendto(udpSocket, buf1, strlen(buf)+1, 0, (struct sockaddr*)&udpServer, sizeof(udpServer));

    if(returnStatus == -1 && returnStatus == -1){
        fprintf(stderr, "Could not send message!\n");
    } else {
        printf("Message sent.\n");
        /*message sent look for confirmation*/
        addrlen = sizeof(udpServer);
        returnStatus = recvfrom(udpSocket, buf, MAXBUF, 0, (struct sockaddr*)&udpServer, &addrlen);
        if (returnStatus == -1){
            fprintf(stderr, "Did not Receive confirmation!\n");
        }
        else {
            buf[returnStatus] = 0;
            printf("received: %s\n",buf);
        }
    }
    close(udpSocket);
    return 0;
}