Re: noSuchName

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On Tue, Sep 27, 2005 at 02:31:52PM +0100, Dave Shield wrote:
> On Tue, 2005-09-27 at 13:05 +0100, Patrick Welche wrote:
> > Good plan: snmpget:
> >
> > { GetRequest(28) R=86800923 system.sysUpTime.0 }
> > { GetResponse(32) R=86800923 system.sysUpTime.0=1062737154 }
> >
> > and my broken programme:
> >
> > { GetRequest(36) R=1548568929 system.sysUpTime.0 .0.0.0.0.0[|snmp] }
> > { GetResponse(36) R=1548568929 noSuchName@2 system.sysUpTime.0= .0.0.0.0.0=[|snmp] }
>
> So it's adding two varbinds instead of one
> (the second of which is bogus)

ah - so the question is, what is the life cycle of a pdu?

pdu=snmp_pdu_create(SNMP_MSG_GET);

gets me an empty pdu

snmp_add_null_var
snmp_add_null_var

adds two oids to it

snmp_sess_synch_response

sends them off and

snmp_free_pdu

core dumps saying its already free ?

Given the simple code attached, I still see

GetRequest(36) R=869755998 system.sysUpTime.0 .iso.org.dod.internet.mgmt[|snmp]
^^^^^^^^^^^^^^^^^^^^^^^^^^
this extra stuff

as opposed to

GetRequest(28) R=736117813 system.sysUpTime.0

from snmpget. Still playing spot the difference.. Any tips/hints?

Cheers,

Patrick

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

void
do_send(void *sessp, netsnmp_pdu *pdu, netsnmp_pdu *response, netsnmp_session *ss)
{
int i, status;
netsnmp_variable_list *vars;

status = snmp_sess_synch_response(sessp, pdu, &response);
if (status == STAT_SUCCESS) {
if ((response)->errstat == SNMP_ERR_NOERROR) {
printf("All...\n");
for (vars = (response)->variables; vars; vars = vars->next_variable)
print_variable(vars->name, vars->name_length, vars);
printf("...OK\n");
} else {
fprintf(stderr, "Error in packet.\nReason %d/%ld: %s\n",snmp_errno,response->errstat,
snmp_errstring((response)->errstat));
if ((response)->errindex != 0) {
fprintf(stderr, "Failed object: ");
for (i = 1, vars = (response)->variables;
vars && (i != (response)->errindex);
vars = vars->next_variable, i++);
if (vars)
fprint_objid(stderr, vars->name, vars->name_length);
fprintf(stderr, "\n");
}
exit(2);
}
} else if (status == STAT_TIMEOUT) {
fprintf(stderr, "Timeout: No Response\n");
exit(1);
} else { /* status == STAT_ERROR */
snmp_sess_perror("do_snmp", ss);
exit(1);
}
}
int
main()
{
#define NOIDS 3
static const char *varname[]={
"SNMPv2-MIB::sysUpTime.0",
"SNMPv2-MIB::sysDescr.0",
"IF-MIB::ifIndex.1"
};

void *sessp;
netsnmp_session session, *ss;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
oid value[NOIDS][MAX_OID_LEN];
size_t valuelen[NOIDS];
int i, failures;
struct tree *mibtree;

/* just to keep gcc quiet */
response=NULL;

init_snmp("test");
snmp_sess_init(&session);
session.peername="localhost";
session.version=SNMP_VERSION_1;
session.community="hello";
session.community_len=strlen(session.community);
SOCK_STARTUP; /* ?? */
sessp=snmp_sess_open(&session);
ss=snmp_sess_session(sessp);
if(ss==NULL) {
snmp_perror("Couldn't establish the session");
exit(1);
}

init_mib();
mibtree=read_module("SNMPv2-MIB");
mibtree=read_module("IF-MIB");
/* parse all oids */
failures=0;
for (i=0; i<NOIDS; ++i) {
valuelen[i]=sizeof(value[i])/sizeof(oid);
if (!snmp_parse_oid(varname[i], value[i], &valuelen[i])) {
snmp_perror(varname[i]);
failures++;
}
fprintf(stderr,"%2d,%3d: ",i,valuelen[i]);
fprint_objid(stderr,value[i],valuelen[i]);
};

if (failures) {
SOCK_CLEANUP;
exit(1);
}

pdu=snmp_pdu_create(SNMP_MSG_GET);

snmp_add_null_var(pdu,value[0],valuelen[0]);
snmp_add_null_var(pdu,value[1],valuelen[1]);

do_send(sessp, pdu, response, ss);

snmp_free_pdu(pdu);
if (response) snmp_free_pdu(response);

pdu=snmp_pdu_create(SNMP_MSG_GET);

value[2][valuelen[2]-1]=1;
snmp_add_null_var(pdu,value[2],valuelen[2]);
value[2][valuelen[2]-1]=2;
snmp_add_null_var(pdu,value[2],valuelen[2]);
value[2][valuelen[2]-1]=3;
snmp_add_null_var(pdu,value[2],valuelen[2]);

do_send(sessp, pdu, response, ss);

snmp_free_pdu(pdu);
if (response) snmp_free_pdu(response);

shutdown_mib();
snmp_sess_close(sessp);

return 0;
}

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