server.c

/*
** listener.c -- a datagram sockets "server" demo
** taken from beej
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pthread.h>
#include "common.h"

#define MYPORT "4950"	// the port users will be connecting to
#define MAXBUFLEN 256
#define MAX_THREADS 10

struct sockaddr_in server_addr, client_addr;
thread_no = 0;

// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
    if (sa->sa_family == AF_INET) {
        return &(((struct sockaddr_in*)sa)->sin_addr);
    }

    return &(((struct sockaddr_in6*)sa)->sin6_addr);
}


void* handle_request(void *buf){
    char s[INET6_ADDRSTRLEN];

    test_struct_t *client_data = (test_struct_t *) buf;

    result_struct_t result;
    int k = 0;
    for (int i = 0; i < strlen(client_data->name); i++) {
        result.c[i] = client_data->name[i];
        k++;
    }
    result.c[k] = ' ';
    k += 1;
    for (int i = 0; i < strlen(client_data->age); i++) {
        result.c[k] = client_data->age[i];
        k++;
    }
    result.c[k] = ' ';
    k += 1;
    for (int i = 0; i < strlen(client_data->group); i++) {
        result.c[k] = client_data->group[i];
        k++;
    }

    printf("listener: got packet from %s\n",
           inet_ntop(client_addr.sin_family,
                     get_in_addr((struct sockaddr *)&client_addr),
                     s, sizeof s));

    printf("Thread id: %d", thread_no);

    sleep(10);
}


int main(void)
{
    int sockfd, sent_recv_bytes = 0;
    struct addrinfo hints, *servinfo, *p;
    int rv;
    int numbytes;
    struct sockaddr_storage their_addr;
    char buf[MAXBUFLEN];
    socklen_t addr_len;
    char s[INET6_ADDRSTRLEN];


    // Создаем структуру для указания семейства, типа сокета и режима автозаполнения IP адресса
    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_INET; // AF_INET to force IPv4
    hints.ai_socktype = SOCK_DGRAM;
    hints.ai_flags = AI_PASSIVE; // auto set my IP

    if ((rv = getaddrinfo(NULL, MYPORT, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through all the results and bind to the first we can
    for(p = servinfo; p != NULL; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype,
                             p->ai_protocol)) == -1) {
            perror("listener: socket");
            continue;
        }

        if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("listener: bind");
            continue;
        }

        break;
    }

    if (p == NULL) {
        fprintf(stderr, "listener: failed to bind socket\n");
        return 2;
    }

    freeaddrinfo(servinfo);

    printf("listener: waiting to recvfrom...\n");

    addr_len = sizeof client_addr;

    pthread_t threads[MAX_THREADS];
    int rc = 0;

    while (1) {
        /*Step 6 : Wait for client connection*/
        /*state Machine state 1 */

        if ((numbytes = recvfrom(sockfd, buf, MAXBUFLEN-1 , 0,
                                 (struct sockaddr *)&client_addr, &addr_len)) == -1) {
            perror("recvfrom");
            exit(1);
        }

        printf("listener: packet is %d bytes long\n", numbytes);

        rc = pthread_create(&threads[thread_no], NULL, handle_request, (void*)buf);
        if(rc){
            printf("A request could not be processed\n");
        }
        else{
            thread_no++;
        }


    }
    return 0;
}