Re: weird tutorial

[Mauricio Reyes]

Hi Robert,
The snmpget with v 3 works perfectly. I have checked the tutorial and based 
on it I modifyied to support both authentication and encryption. See code 
above. I don't know what it is. the weird thing is that it works on linux.

thanks
Mauricio.

From: Robert Story (Users) <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: "Mauricio Reyes" <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED]
Subject: Re: weird tutorial
Date: Thu, 18 Nov 2004 17:06:54 -0500
On Thu, 18 Nov 2004 19:16:07 +0000 Mauricio wrote:
MR> The client has also openssl, I included the libeay32.lib in it. 
Besides, I
MR> run the normal snmpget and it works fine. what else could be the 
problem?

You run the normal snmpget with -v3 and encryption options, and it works? 
If
that's the case, then the libraries should work with a properly coded
application.

Have you checked out the tutorial's use of v3?
http://www.net-snmp.org/tutorial/tutorial-5/toolkit/demoapp/snmpdemoapp.c
--
Robert Story; NET-SNMP Junkie
Support: <http://www.net-snmp.org/> <irc://irc.freenode.net/#net-snmp>
Archive: 
<http://sourceforge.net/mailarchive/forum.php?forum=net-snmp-users>

You are lost in a twisty maze of little standards, all different.
------------CODE---------------
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <string.h>
const char *pass="testthispass";
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;
init_snmp("snmpapp");
snmp_sess_init( &session );
session.peername = strdup("127.0.0.1");
session.version=SNMP_VERSION_3;
session.securityName = strdup("testusr");
session.securityNameLen = strlen(session.securityName);
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
session.securityAuthProto = usmHMACMD5AuthProtocol;
session.securityAuthProtoLen = sizeof(usmHMACMD5AuthProtocol)/sizeof(oid);
session.securityAuthKeyLen = USM_AUTH_KU_LEN;
session.securityPrivProto = usmDESPrivProtocol;
session.securityPrivProtoLen = USM_PRIV_PROTO_DES_LEN;
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
if (generate_Ku(session.securityAuthProto,
                session.securityAuthProtoLen,
                (u_char *) pass, strlen(pass),
                session.securityAuthKey,
                &session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
    snmp_perror(argv[0]);
    snmp_log(LOG_ERR,
             "Error generating Ku from authentication pass phrase. \n");
    exit(1);
}
if (generate_Ku(session.securityAuthProto,
                session.securityAuthProtoLen,
                (u_char *) pass, strlen(pass),
                session.securityPrivKey,
                &session.securityPrivKeyLen) != SNMPERR_SUCCESS) {
    snmp_perror(argv[0]);
    snmp_log(LOG_ERR,
             "Error generating Ku from authentication pass phrase. \n");
    exit(1);
}
SOCK_STARTUP;
ss = snmp_open(&session);
if (!ss)
{
    snmp_perror("ack");
    snmp_log(LOG_ERR, "something horrible happened!!!\n");
    exit(2);
}
pdu = snmp_pdu_create(SNMP_MSG_GET);
read_objid(".1.3.6.1.2.1.1.4.0", anOID, &anOID_len);
snmp_add_null_var(pdu, anOID, anOID_len);
status = snmp_synch_response(ss, pdu, &response);
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR)
{
  for(vars = response->variables; vars; vars = vars->next_variable)
    print_variable(vars->name, vars->name_length, vars);
  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
{
  if (status == STAT_SUCCESS)
    fprintf(stderr, "Error in packet\nReason: 
%s\n",snmp_errstring(response->errstat));
  else
    snmp_sess_perror("snmpget", ss);
}

if (response)
  snmp_free_pdu(response);
snmp_close(ss);
SOCK_CLEANUP;
return (0);
}
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