netex/src/net/netex.c

#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>

#include "netex.h"
#include "config.h"

#define PORT_NUM_LENGHT 6


void netex_init(void)
{
    // OpenSSL
    PRINT_LINE("Initializing OpenSSL...");
    SSL_load_error_strings();
    SSL_library_init();
    OpenSSL_add_all_algorithms();
}
void netex_shutdown(void)
{
    // OpenSSL
    ERR_free_strings();
    EVP_cleanup();
}

int setup_socket(const int port, const char* hostname)
{
    struct addrinfo *cur_addrdinfo;
    struct addrinfo hints_addrinfo = {0};
    int sock_fd = 0;
    hints_addrinfo.ai_family = AF_UNSPEC;
    hints_addrinfo.ai_socktype = SOCK_DGRAM;
    hints_addrinfo.ai_flags = AI_PASSIVE;
    hints_addrinfo.ai_protocol = 0;
    hints_addrinfo.ai_canonname = NULL;
    hints_addrinfo.ai_addr = NULL;
    hints_addrinfo.ai_next = NULL;
    char port_str[PORT_NUM_LENGHT];
    const int print_result = snprintf(port_str, PORT_NUM_LENGHT, "%d", port);
    if (print_result < 0)
    {
        ERROR("Failed to convert port to string!");
        return -1;
    }
    if (print_result >= PORT_NUM_LENGHT)
        WARN("Convert output string truncated (port) to value: '%s'", port_str);

    if (getaddrinfo(hostname, port_str, &hints_addrinfo, &cur_addrdinfo) != 0)
    {
        ERROR("Could not get the address info of hostname: '%s'", hostname);
        return -1;
    }
    //TODO: Need fihure out why data from getaddrinfo is not working.
    /*for (const struct addrinfo* tmp_addrinfo = cur_addrdinfo; tmp_addrinfo != NULL; tmp_addrinfo = tmp_addrinfo->ai_next)
    {
        sock_fd = socket(tmp_addrinfo->ai_family, tmp_addrinfo->ai_socktype, tmp_addrinfo->ai_protocol);
        if (sock_fd == -1)
            continue;
        if (bind(sock_fd, tmp_addrinfo->ai_addr, tmp_addrinfo->ai_addrlen) == 0)
            break; // Succesfull bind to the hostname
        close(sock_fd); // Close the socket en if there are more 'addrinfo' retry in the while loop.
    }*/
    freeaddrinfo(cur_addrdinfo);
    struct sockaddr_in sockaddr;
    sock_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (sock_fd < 0)
    {
        ERROR("Failed to created socket");
        return -1;
    }
    sockaddr.sin_family = AF_INET;
    sockaddr.sin_port = htons(6920);
    sockaddr.sin_addr.s_addr = INADDR_ANY;
    const int bind_result = bind(sock_fd, (struct sockaddr*)&sockaddr, sizeof(sockaddr));
    if (bind_result != 0)
    {
        ERROR("Could not bind!");
        close(sock_fd);
        return -1;
    }
    return sock_fd;
}