snmpv3 broadcast

Hi,
I've changed snmpdemoapp to work with snmpv3 ( auth & Priv ), to as my
configuration of snmpd.conf,
But i can't handle async response.
I've applied the patch:   
70068--http://sf.net/support/tracker.php?aid=700681
on 5.3 release.
the broadcast is sent out ( checked with ethereal ), but as I mensioned
I can't handle async response.
And that the output from runing it:


No log handling enabled - turning on stderr logging
snmpget: USM unknown security name (no such user exists)



Here is the code:

#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <string.h>

/* change the word "define" to "undef" to try the (insecure) SNMPv1
version */
#define DEMO_USE_SNMP_VERSION_3

#ifdef DEMO_USE_SNMP_VERSION_3
const char *our_v3_passphrase = "???????????";
const char *our_v3_priv_passphrase = "?????????????";
#endif

int main(int argc, char ** argv)
{
    struct snmp_session session, *ss;
    struct snmp_pdu *pdu;
    struct snmp_pdu *response;

    oid anOID[MAX_OID_LEN];
    size_t anOID_len = MAX_OID_LEN;

    struct variable_list *vars;
    int status;
    int count=1;

    /*
     * Initialize the SNMP library
     */
    init_snmp("snmpapp");

    /*
     * Initialize a "session" that defines who we're going to talk to
     */
    snmp_sess_init( &session );                   /* set up defaults */
//  Enable Bcasting
    session.peername = strdup("255.255.255.255");
    session.flags    |= SNMP_FLAGS_UDP_BROADCAST;
//    session.callback = 0;                                            
            **** What should if any, do here?????
    session.callback  = snmp_async_send;                  

    /* set up the authentication parameters for talking to the server */

#ifdef DEMO_USE_SNMP_VERSION_3

    /* Use SNMPv3 to talk to the experimental server */

    /* set the SNMP version number */
    session.version=SNMP_VERSION_3;

    /* set the SNMPv3 user name */
//    session.securityName = strdup("MD5User");
    session.securityName = strdup("?????");
    session.securityNameLen = strlen(session.securityName);

    /* set the security level to authenticated, but not encrypted */
    session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;

    /* set the authentication method to MD5 */
    session.securityAuthProto = usmHMACMD5AuthProtocol;
    session.securityAuthProtoLen =
sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
    session.securityAuthKeyLen = USM_AUTH_KU_LEN;

    /* set the authentication key to a MD5 hashed version of our
       passphrase "The UCD Demo Password" (which must be at least 8
       characters long) */
    if (generate_Ku(session.securityAuthProto,
                    session.securityAuthProtoLen,
                    (u_char *) our_v3_passphrase, strlen(our_v3_passphrase),
                    session.securityAuthKey,
                    &session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
        snmp_perror(argv[0]);
        snmp_log(LOG_ERR,
                 "Error generating Ku from authentication pass phrase. \n");
        exit(1);
    }

    /* set the priv method to DES */
    session.securityPrivProto = usmDESPrivProtocol;
    session.securityPrivKeyLen = USM_PRIV_KU_LEN;

    if (generate_Ku(session.securityAuthProto,
                    session.securityAuthProtoLen,
                    (u_char *) our_v3_priv_passphrase,
strlen(our_v3_priv_passphrase),
                    session.securityPrivKey,
                    &session.securityPrivKeyLen) != SNMPERR_SUCCESS) {
            snmp_perror(argv[0]);
            snmp_log(LOG_ERR, "Error generating Ku from priv pass
phrase. \n");
            exit(1);
    }

#else /* we'll use the insecure (but simplier) SNMPv1 */

    /* set the SNMP version number */
    session.version = SNMP_VERSION_1;

    /* set the SNMPv1 community name used for authentication */
    session.community = "demopublic";
    session.community_len = strlen(session.community);

#endif /* SNMPv1 */

    /*
     * Open the session
     */
    SOCK_STARTUP;
    ss = snmp_open(&session);                     /* establish the
session */

    if (!ss) {
        snmp_perror("ack");
        snmp_log(LOG_ERR, "something horrible happened!!!\n");
        exit(2);
    }

    /*
     * Create the PDU for the data for our request.
     *   1) We're going to GET the system.sysDescr.0 node.
     */
    pdu = snmp_pdu_create(SNMP_MSG_GET);
    read_objid(".1.3.6.1.2.1.1.1.0", anOID, &anOID_len);

#if OTHER_METHODS
    get_node("sysDescr.0", anOID, &anOID_len);
    read_objid("system.sysDescr.0", anOID, &anOID_len);
#endif

    snmp_add_null_var(pdu, anOID, anOID_len);

    /*
     * Send the Request out.
     */
    status = snmp_synch_response(ss, pdu, &response);

    /*
     * Process the response.
     */
    if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
      /*
       * SUCCESS: Print the result variables
       */

      for(vars = response->variables; vars; vars = vars->next_variable)
        print_variable(vars->name, vars->name_length, vars);

      /* manipuate the information ourselves */
      for(vars = response->variables; vars; vars = vars->next_variable) {
        if (vars->type == ASN_OCTET_STR) {
          char *sp = (char *)malloc(1 + vars->val_len);
          memcpy(sp, vars->val.string, vars->val_len);
          sp[vars->val_len] = '\0';
          printf("value #%d is a string: %s\n", count++, sp);
          free(sp);
        }
        else
          printf("value #%d is NOT a string! Ack!\n", count++);
      }
    } else {
      /*
       * FAILURE: print what went wrong!
       */

      if (status == STAT_SUCCESS)
        fprintf(stderr, "Error in packet\nReason: %s\n",
                snmp_errstring(response->errstat));
      else
        snmp_sess_perror("snmpget", ss);

    }

    /*
     * Clean up:
     *  1) free the response.
     *  2) close the session.
     */
    if (response)
      snmp_free_pdu(response);
    snmp_close(ss);

    SOCK_CLEANUP;
    return (0);
} /* main() */


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