On 11/13/09 2:22 PM, Dave Shield wrote:
> 2009/11/13 Mike Bowie<[email protected]>:
>
>> Looking at agent/mibgroup/mibII/ip.c @ 850 onwards, the "Loaded IP Group
>> (sysctl)" message is only called if IPFORWARDING and IPDEFAULTTTL are
>> missed and ret_value is greater than or equal to zero; unless I'm
>> missing something.
>>
> The 'ip_load' routine actually serves two seperate roles.
>
> One is to load the contents of an internal cache, used for
> most of the the IP statistics (but excluding ipForwarding and
> ipDefaultTTL). This is done automatically by the cache
> handler, before the IP handler is ever called.
> In this case, the 'magic' parameter is zero - because
> the cache helper doesn't typically use this parameter.
>
> That's the normal mode of operation for the cache loading
> method. And that's the debug message that you are
> currently seeing.
>
> But in the case of ip_load, this is pressed into service for
> a second role - to handle the two "special case" variables
> (ipForwarding and ipDefaultTTL). It's that one case which
> we are looking at at the moment.
>
> As I say, my suspicion is that the ipForwarding sysctl
> call is failing, when ip_load is being called for the second
> time. But it's sensible to check this for certain.
>
>
>
>> My debug shows that ret_value in this case is zero. I'm using:
>> char msg[20];
>> sprintf(msg, "ret_value: %d\n", ret_value);
>> DEBUGMSGTL(("mibII/ip", msg));
>>
> Where exactly is this code fragment?
> What does the full 'ip_load' routine look like?
>
> Dave
>
This appears to have fallen off the group thread a message or so back...
if anyone might have suggestions, I'm all ears. (Or eyes, depending on
how you look at it.)
This is what I have in ip.c from 840 on
int
ip_load(netsnmp_cache *cache, void *vmagic)
{
long ret_value = 0;
int i;
static int sname[4] = { CTL_NET, PF_INET, IPPROTO_IP, 0 };
size_t len;
int magic = (int) vmagic;
char init_msg[60];
sprintf(init_msg, "%d|%d|%d\n", magic, IPFORWARDING, IPDEFAULTTTL);
DEBUGMSGTL(("mibII/ip", init_msg));
switch (magic) {
case IPFORWARDING:
DEBUGMSGTL(("mibII/ip", "IPFORWARDING\n"));
len = sizeof i;
sname[3] = IPCTL_FORWARDING;
if (sysctl(sname, 4, &i, &len, 0, 0) < 0) {
DEBUGMSGTL(("mibII/ip", "sysctl ret -1\n"));
return -1;
} else
return (i ? 1 /* GATEWAY */
: 2 /* HOST */ );
case IPDEFAULTTTL:
DEBUGMSGTL(("mibII/ip", "IPDEFAULTTTL\n"));
len = sizeof i;
sname[3] = IPCTL_DEFTTL;
if (sysctl(sname, 4, &i, &len, 0, 0) < 0)
return -1;
else
return i;
default:
DEBUGMSGTL(("mibII/ip", "default\n"));
len = sizeof(ipstat);
sname[3] = IPCTL_STATS;
ret_value = sysctl(sname, 4, &ipstat, &len, 0, 0);
if ( ret_value < 0 ) {
DEBUGMSGTL(("mibII/ip", "Failed to load IP Group (sysctl)\n"));
} else {
DEBUGMSGTL(("mibII/ip", "Loaded IP Group (sysctl)\n"));
}
char ret_msg[20];
sprintf(ret_msg, "ret_value: %d\n", ret_value);
DEBUGMSGTL(("mibII/ip", ret_msg));
return ret_value;
}
}
Querying IP-MIB::ipForwarding.0 results in
$ snmpd -f -Le -DmibII/ip -c /usr/pkg/etc/snmpd.conf
registered debug token mibII/ip, 1
mibII/ip: Initialising IP group
nlist err: neither ipstat nor _ipstat found.
nlist err: neither tcpstat nor _tcpstat found.
nlist err: neither icmpstat nor _icmpstat found.
nlist err: neither udpstat nor _udpstat found.
NET-SNMP version 5.4.2.1
Connection from UDP: [172.16.4.253]:59018->[0.0.0.0]
mibII/ip: 0|1|2
mibII/ip: default
mibII/ip: Loaded IP Group (sysctl)
mibII/ip: ret_value: 0
mibII/ip: Handler - mode GET
mibII/ip: oid: IP-MIB::ipForwarding.0
truncating integer value > 32 bits
As I understand it, ip_load is only being called once... otherwise I'd
expect to see the "init_msg" value output twice.
Any suggestions are most welcome. ;-)
Cheers,
Mike.
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