Re: snmpv3 broadcast

I manged to send request with v1, but how, with this code, handle with
all the responses?

I still will be glad to here if someone managed to do it using v3.

David


David Peer wrote:

>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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