UDPServer.c

// Server side implementation of UDP client-server model
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>


#include <unistd.h>



#define PORT     8080
#define MAXLINE 1024

// Driver code
int main() {
    int sockfd;
    char buffer[MAXLINE];
    char sorted[100];
    char *hello = "bhak bc!";
    struct sockaddr_in servaddr, cliaddr;

    // Creating socket file descriptor
    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    memset(&servaddr, 0, sizeof(servaddr));
    memset(&cliaddr, 0, sizeof(cliaddr));

    // Filling server information
    servaddr.sin_family    = AF_INET; // IPv4
    servaddr.sin_addr.s_addr = INADDR_ANY;
    servaddr.sin_port = htons(PORT);

    // Bind the socket with the server address
    if ( bind(sockfd, (const struct sockaddr *)&servaddr,
            sizeof(servaddr)) < 0 )
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    int len, n;
    n = recvfrom(sockfd, (char *)buffer, MAXLINE,
                MSG_WAITALL, ( struct sockaddr *) &cliaddr,
                &len);
    buffer[n] = '\0';

    printf("Client : %s\n", buffer);


   /* sleep(100);
    //test
    sendto(sockfd, (const char *)hello, strlen(hello),
        MSG_CONFIRM, (const struct sockaddr *) &cliaddr,
            len); */




    int i=0,j,count=0, numc=0;
    char num[10];
    int arr[100];

    while(buffer[i]!='\0'){
        j = i;
        numc=0;
        while(buffer[j]!= ' '){
            num[numc++] = buffer[j];
            j++;
        }
        if(numc!=0){
            num[numc+1] = '\0';
            arr[count++] = atoi(num);
        }


        i++;
    }

    i = 0;
    int tmp;
    while(i<count-1){
        j = i+1;
        int small=i;
        while(j<count-1){
            if(arr[j]<arr[small])
                small = j;

            j++;
        }

        tmp = arr[small];
        arr[small] = arr[i];
        arr[i] = tmp;

        i++;
    }

    i=0;

    memset(num, '\0', sizeof(num));
    memset(sorted, '\0', sizeof(sorted));

    while(i<count-1){
        sprintf(num, "%d ", arr[i++]);
        strcat(sorted, num);
    }
    //strcat(sorted, "\0");

    printf("Sorted:%s\n", sorted);
    //printf("Client : %s\n", buffer);



    sendto(sockfd, (const char *)hello, strlen(hello),
        MSG_CONFIRM, (const struct sockaddr *) &cliaddr,
            len);
    printf("sorted message sent.\n");


    return 0;
}