On Wed, Jul 13, 2011 at 2:38 PM, Zack Little <[email protected]> wrote:
>
>
>> > how would I use the InetAddress object binary string to return
>> > an IPv6 address in my custom MIB? None of those types seem related to a
>> > binary string.
>>
>> I haven't checked the code, but it should be possible to use the 'string'
>> type to return a binary string value, as well as regular ASCII strings.
>>
>> Try it.
>>
> I looked at the pass_persist.c code and if "string" is passed in it sets the
> 'type' in the structure to ASN_OCTET_STR. So I think that means I could
> pass in the binary representation of the IPv6 address. After reading
> INET-ADDRESS-MIB I'm still unclear as to how to convert and IPv6 address
> into the binary format the net-snmp code expects. There is not an existing
> conversion function I could call?
>
>> > The situation with snmptrap seems better
>> > because it can accept arguments with a type of "HEX STRING" or "DECIMAL
>> > STRING". I don't know how to convert an IPv6 address into that format
>> > though.
>>
>> Try querying the agent for an existing table object that shows such
>> an IPv6 address, and use the '-d' flag to dump the raw packets.
>> That will show how IPv6 addresses are represented.
>>
>> Or see the description in the INET-ADDRESS-MIB
>>
>> Dave
> I'm still struggling to understand why the implementation is how it
> currently is. I enabled IPv6 support when I compiled the net-snmp tool.
> Therefore it's very easy to specify an IPv6 address to snmptrap as the
> destination of where the trap should be sent. If you're able to easily
> specify an IPv6 destination then it stands to reason that in your trap you
> would want to include some IPv6 IP address information. So in this example
> below the trap's destination of ::1 (the first one) is happily accepted by
> the code but the trap argument of ::1 (the second one) is not.
>
> /bin/snmptrap -v 3 -u userid -a MD5 -A authpasswd -x DES -X encryptpasswd -l
> authPriv ::1 449800 IpInfo TheIp a ::1
Not totally unrelated, but.. I spy with my little eye something v4
(apps/snmptrap.c):
agent = argv[arg];
if (agent != NULL && strlen(agent) != 0) {
int ret = netsnmp_gethostbyname_v4(agent, pdu_in_addr_t);
if (ret < 0) {
fprintf(stderr, "unknown host: %s\n", agent);
exit(1);
}
} else {
*pdu_in_addr_t = get_myaddr();
}
As for your issue, what I did was reproduced it following the example
in the tutorial (
http://www.net-snmp.org/tutorial/tutorial-5/commands/snmptrap.html ),
and with the following command line:
$ cat > NOTIFICATION-TEST-MIB.txt <<EOF
NOTIFICATION-TEST-MIB DEFINITIONS ::= BEGIN
IMPORTS ucdavis FROM UCD-SNMP-MIB;
demonotifs OBJECT IDENTIFIER ::= { ucdavis 991 }
demo-notif NOTIFICATION-TYPE
STATUS current
OBJECTS { sysLocation }
DESCRIPTION "Just a test notification"
::= { demonotifs 17 }
END
EOF
$ snmptrap -M +$PWD -m all -v2c -c public fallout ''
NOTIFICATION-TEST-MIB::demo-notif IF-MIB::linkUp a ::1
IF-MIB::linkUp: Bad value notation (::1)
Looking through gdb and the source code, it's pretty obvious why
this doesn't work (from snmp_add_var in snmplib/snmp_api.c):
case 'a':
#ifndef NETSNMP_DISABLE_MIB_LOADING
if (check && tp->type != TYPE_IPADDR) {
value = "IpAddress";
result = SNMPERR_VALUE;
goto type_error;
}
#endif /* NETSNMP_DISABLE_MIB_LOADING */
atmp = inet_addr(value);
if (atmp != (in_addr_t) -1 || !strcmp(value, "255.255.255.255"))
inet_aton only groks IPv4 addresses :). Additional logic needs to
be added to parse out the address via inet_addr -- I would introduce
another argument (say 'A' instead of 'a'?) for IPv6 addresses so that
way there's a clean method for dealing with IPv4 vs IPv6 (some
revamping will need to occur because IPv6 addresses must be
IPV6-TC::Ipv6Address types, for instance, from what I can see etc).
I'll see if I can whip up a patch later on tonight because I know
this is going to be a snag for my group in a couple of months :/..
Thanks,
-Garrett
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