Well I've finally found the origin of the crash and it had nothing to do
with net-snmp. There was an array overflow somewhere in the code and this
messed up the heap which made my program crash.
Although it's working as it should now, I still get the warning from
valgrind and I think it shouldn't be there. This is the code which causes
the valgrind warning:
void snmp::snmpget(string IpAddress, string OID, string community)
{
struct snmp_session session;
struct snmp_pdu *pdu;
oid anOID[MAX_OID_LEN];
size_t anOID_len = MAX_OID_LEN;
struct timeval now;
struct timezone tz;
struct tm *tm;
gettimeofday(&now, &tz);
tm = localtime(&now.tv_sec);
M_operation = NETSNMP_CALLBACK_OP_TIMED_OUT;
snmp_sess_init( &session );
session.peername = (char*)IpAddress.c_str();
session.version = SNMP_VERSION_2c;
session.community = (u_char*)community.c_str();
session.community_len = strlen((char*)session.community);
session.callback = asynch_response;
session.callback_magic = (void *)this;
session.timeout = 1000000; // 1 sec
session.retries = 3; // sometimes we might miss a packet, so let's
take 3 retries
// Open the session
ss = snmp_open(&session);
if (!ss) {
cout << "Snmpget : failed to open snmp session \n";
cout << " time: " << tm->tm_hour << ":" << tm->tm_min << ":" <<
tm->tm_sec<< ":" << now.tv_usec;
cout << " OID : " << OID << " host : " << IpAddress << " community :
" << community << "\n";
return;
}
// define method (snmpget) and OID
pdu = snmp_pdu_create(SNMP_MSG_GET);
read_objid((char*)OID.c_str(), anOID, &anOID_len);
snmp_add_null_var(pdu, anOID, anOID_len);
// send the request
if (!snmp_send(ss, pdu)) {
cout << "Couldn't send snmpget \n";
snmp_free_pdu(pdu);
}
}
This is the valgrind warning I get:
==29356== Thread 1:
==29356== Syscall param socketcall.sendmsg(msg.msg_control) points to
uninitialised byte(s)
==29356== at 0x40C9F78: sendmsg (in /lib/libpthread-0.10.so)
==29356== by 0x80F6E88: snmp_sess_async_send (snmp_api.c:4892)
==29356== by 0x80F73F3: snmp_send (snmp_api.c:4657)
==29356== by 0x805D92A: snmp::snmpget(std::string, std::string,
std::string) (in /usr/bin/poller/poller)
==29356== by 0x8056E1F: Poller::runPoller() (in /usr/bin/poller/poller)
==29356== by 0x804E4E6: Config::RunNextPollers() (in
/usr/bin/poller/poller)
==29356== by 0x804F303: Config::handle(OTC_Event*) (in
/usr/bin/poller/poller)
==29356== by 0x80A5D78: OTC_EVAgent::filter(OTC_Event*) (in
/usr/bin/poller/poller)
==29356== by 0x80A5D56: OTC_EVAgent::execute(OTC_Event*) (in
/usr/bin/poller/poller)
==29356== by 0x80A5D34: OTC_EVAgent::accept(OTC_Event*) (in
/usr/bin/poller/poller)
==29356== by 0x80A701C: OTC_Event::deliver(int) (in
/usr/bin/poller/poller)
==29356== by 0x80A742E: OTC_EventJob::execute() (in
/usr/bin/poller/poller)
==29356== Address 0xBEFE7F80 is on thread 1's stack
Is there something wrong in my code?
2008/6/3 Dave Shield <[EMAIL PROTECTED]>:
> 2008/6/3 Largo <[EMAIL PROTECTED]>:
> > - I have a function snmpget, where I call snmp_send.
> > This is where I get the valgrind warning.
>
> What does this code look like?
>
> Dave
>
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