bio_sockets.h

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#if !defined(__BIO_SOCKET_TEMPLATE_H__)
#define __BIO_SOCKET_TEMPLATE_H__
 
#include <openssl/bio.h>
#include <openssl/ssl.h>
#include <openssl/err.h>
 
/*
    A template for opening a non-blocking BIO socket.
*/
BIO* open_nb_socket(const char* addr, const char* port) {
    BIO* bio = BIO_new_connect(addr);
    BIO_set_nbio(bio, 1);
    BIO_set_conn_port(bio, port);
 
    /* timeout after 10 seconds */
    int start_time = time(NULL);
    while(BIO_do_connect(bio) == 0 && (int)time(NULL) - start_time < 10);
 
    if (BIO_do_connect(bio) <= 0) {
        fprintf(stderr, "Failed to open socket: BIO_do_connect returned <= 0\n");
        return NULL;
    }
 
    return bio; 
}
 
#endif