endian problems Net-SNMP

[nbm2]

Hi

I have endian issues in net-snmp.
when requesting for a value, instead of presenting 1 I get 16777216 (which is 1000...0000)
I tried adding the flag "--with-endianness" in configure with both big and little values - and none worked

What to do?

here are configure commands (in a file that I execute):
------------------------------------------------------------------------------
CC=mips64-octeon-linux-gnu-gcc\
LD=/home/naamab/projects/eclipse/env/cavium-sdk/tools-gcc-4.3/mips64-octeon-linux-gnu/bin/ld\
./configure --target=mips64-octeon-linux-gnu\
--build=mips64-octeon-linux-gnu\
--host=i686-pc-linux-gnu\
--prefix=$PWD/usr\
--exec-prefix=$PWD/../../../bin\
--with-build-cc=gc\
--with-endianness=big\
--enable-shared\
--enable-embedded-perl\
--with-mib-modules="ucd_snmp"\
--with-default-snmp-version=3\
--with-sys-location=\
--with-logfile=/data/net/naamab/snmp/log/snmpd.log\
--with-persistent-directory=/data/net/naamab/snmp/snmp_persist/

[Rubberman]

In any case, you need to use the host-to-network and network-to-host conversion functions. Which, depends upon the type/size of value you are converting, such as htonl/ntohl (32bit values), htons/ntohs (16bit values). The sending side needs to encode the values using htonl/htons and the receiving side needs to decode the values using ntohl/ntohs functions/macros.

[nbm2]

I'm not sure where I need to use these functuins.
I created my MIBs source/header files using mib2c tool and filled in the necessary data.

- on the GET case, after getting the proper value from my external code I use the function "snmp_set_var_typed_value" (Net-SNMP/mib2c function)

- on the SET action I get the value from the request using :
req_value = *(requests->requestvb->val.integer);
and than set the new value on my external code
(requests is a pointer to the Net-SNMP structure "netsnmp_request_info" and it is one of the paraneters the handler receive)

Thank you,
nbm

[nbm2]

In any case, you need to use the host-to-network and network-to-host conversion functions. Which, depends upon the type/size of value you are converting, such as htonl/ntohl (32bit values), htons/ntohs (16bit values). The sending side needs to encode the values using htonl/htons and the receiving side needs to decode the values using ntohl/ntohs functions/macros.

Isn't there a way to tell SNMP to always swap the wndian of the fields instead of using these functions?

[Rubberman]

Isn't there a way to tell SNMP to always swap the wndian of the fields instead of using these functions?

Don't know. I haven't done much SNMP programming and MIB development so I'm not the best person to ask that. However, if the functions don't have a flag to allow that, I would doubt it.

[nbm2]

Thanks a lot for your help.
I found the problem, and it had nothing to do with SNMP, but with a bug in my code

Have a great day!