Hi,
I'm trying to write a simple snmp program to query some values of a
sensor server. Following the tutorial as an example, all seemed fine,
until I tried executing the program on different platforms.
Compiliation is fine on all, but running the programm often segfaults
or gives other errors.
I am using protocol version 1 (because the sensor server only supports
that), don't know the versions of the library. (where can I find what
I am using?)
On linux machines, be it 32 or 64 bit, centos 5.3 or fedora4, 10, 11
or whatever, I get a segfault if I use the snmp_init function (with a
parameter of "snmpapp"), but on the
Mac OS X 10.5.8 intel all's fine.
On Mac OS X 10.4.11 ppc it returns a response.errstat of 2 when I
don't use the snmp_init, and complains about a missing symbol
(_RAND_bytes) if I do use it.
Unfortunately, the docs are absolutely not clear as to whether this
function *must* be called, and about what the value of the paramter
should be.
As mentioned, the program runs fine on all linux intel systems when
*not* using snmp_init, but fails on ppc (big-endian problem?)
The relevant parts of the program are:
/* Initialize snmp. */
nit_snmp("snmpapp"); // <- segfaults on linux, causes dyn. linker
problems on Mac OS X 10.4.11 ppc
/* Initialize the connection. */
struct snmp_session session;
struct snmp_session *sess_handle;
snmp_sess_init( &session );
session.version = SNMP_VERSION_1;
session.community = "public";
session.community_len = strlen((const char *)session.community);
session.peername = "my.host.this.domain";
sess_handle = snmp_open(&session);
/* Set up the object for reading. We will read all at once! */
pdu = snmp_pdu_create(SNMP_MSG_GET);
size_t status_len = MAX_OID_LEN;
oid status_oid[MAX_OID_LEN];
read_objid(".1.3.6.1.4.1.3854.1.2.2.1.16.1.4.0", status_oid,
&status_len);
snmp_add_null_var(pdu, status_oid, status_len);
status = snmp_synch_response(sess_handle, pdu, &response);
if ((status == STAT_SUCCESS) && (response->errstat ==
SNMP_ERR_NOERROR) && response->variables) {
for (d = 0, vars = response->variables; vars; vars = vars-
>next_variable, d++) {
// process the values here
}
} else {
// report the error here
}
I'd be very grateful for any help or even just further questions!
Thanks in advance
Robert
Departement Informatik FGB tel +41 (0)61 267 14 66
Universität Basel fax. +41 (0)61 267 14 61
Robert Frank
Klingelbergstrasse 50 robert.fr...@unibas.ch
CH-4056 Basel
Switzerland
http://www.informatik.unibas.ch/personen/frank_r.html
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