ask for help

Dear Teachers:
   I am sorry to trouble you, but I can solve some questions .Can you 
help me ?
   This program have compiled successful .But when I run a program ,it 
always show "the host 127.0.0.1 do not support snmp get_default_way 
wrong" , I didn't know what should I do! The related fuctions as follows:
	

main(int argc, char **argv)
{
	char *ip;
	interface_list_t	interface_ent = NULL;
	struct in_addr host_in_addr;

	if ( get_default_gateway("127.0.0.1", &ip)) {
		fprintf(stderr, "get_default_gateway wrong!");
		exit(1);
;;;;;;;;;
;;;;;;;;}
get_default_gateway(const char * ip, char ** result)
{
	if(snmpz_isaware(ip)){
		fprintf(stderr, "The host %s do not support snmp", ip);
		return 1;
	}

	if (snmpz_open(ip, COMMUNITY) != 0)
		return -1;

	if (snmpz_getip("1.3.6.1.2.1.4.21.1.7.1.1.1.1", result) != 0) {
		fprintf(stderr, "snmpz_getip error\n");
	}	
snmpz_close();
	return 0;
}

int snmpz_isaware(const char *hostname)
{
  struct snmp_session session_init;
  struct snmp_session *mysession;
  struct snmp_pdu *pdu;
  struct snmp_pdu *response = NULL;
  oid myoid[] = { 1, 3, 6, 1, 2, 1, 1, 1, 0 };
  int res;

  init_snmp("psnmp");
  snmp_sess_init(&session_init);
  session_init.peername = (char *)hostname;
  session_init.version = SNMP_VERSION_1;
  session_init.community = "pubic";
  session_init.community_len = strlen("pubic");
  session_init.timeout = 100000;
  session_init.retries = 1;
  if((mysession = snmp_open(&session_init)) == NULL)
    return -1;

  if((pdu = snmp_pdu_create(SNMP_MSG_GET)) == NULL)
    res = -2;
  else {
    snmp_add_null_var(pdu, myoid, sizeof(myoid) / sizeof(oid));
    if(snmp_synch_response(mysession, pdu, &response) == STAT_SUCCESS) {
      if(response->errstat == SNMP_ERR_NOERROR)
	res = 0;
      else
	res = 1;
    } else
      res = 1;
    if (response) snmp_free_pdu(response);
  }
  snmp_close(mysession);
  return res;
}
   What'wrong?
  I am  looking forward to  hearing from you! 
Thank you very much!
                                                  yours students:yangjing
                                                         July 19 


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