RE: Creating inetCidrRouteTable row entries

2014-01-27 Thread Daniel Tingstrom 
and it should be fixed the the next 5.7.3.pre release.

That's great. I also found the same netmask problem in the route deletion
method (_netsnmp_ioctl_route_delete_v4) which is in the same source file
(route_ioctl.c). However, route deletion only works after a restart of
snmpd, and crashes snmpd if a route was previously added during the same
runtime instance. I think this issue lies with route caching, but I have not
looked much into it.

Regards,
Daniel

-Original Message-
From: Niels Baggesen [mailto:n...@users.sourceforge.net] 
Sent: Monday, January 27, 2014 4:29 PM
To: Daniel Tingstrom; net-snmp-coders@lists.sourceforge.net
Subject: Re: Creating inetCidrRouteTable row entries

Den 21-01-2014 16:32, Daniel Tingstrom skrev:
 I couldn't find an existing function to convert a prefix length to a 
 netmask, so I just wrote my own. Net SNMP version is 5.7.2. Here is 
 the
 patch:

Thanks for finding this!

 --- route_ioctl.c.old 2012-10-09 18:28:58.0 -0400
 +++ route_ioctl.c 2014-01-21 10:30:32.239381288 -0500
 @@ -114,7 +114,7 @@
   DEBUGMSGTL((access:route,via %s\n, DEBUGSTR));

   mask.sin_family = AF_INET;
 -mask.sin_addr.s_addr = htonl(0);
 +mask.sin_addr.s_addr = entry-rt_pfx_len ? htonl((( ((uint32_t)1) 
 + 
 (32-entry-rt_pfx_len)) - 1) ^ 0xU) : 0;
   DEBUGSTR = inet_ntoa(mask.sin_addr);
   DEBUGMSGTL((access:route,mask %s\n, DEBUGSTR));

Thanks for the patch. I did create a function for converting prefix to mask,
and it should be fixed the the next 5.7.3.pre release.

/Niels

--
Niels Baggesen - @home - Århus - Denmark - n...@users.sourceforge.net
The purpose of computing is insight, not numbers   ---   R W Hamming


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Creating inetCidrRouteTable row entries

2014-01-17 Thread Daniel Tingstrom 
Hi, 

I need to add a static route entry in linux via SNMP. So I am using
inetCidrRouteTable. Unfortunately, the implementation of
_netsnmp_ioctl_route_set_v4() in route_ioctl.c always hardcodes the route's
netmask to 0.0.0.0, allowing only default gateway routes to be added. 

I had to manually change the following line:

mask.sin_addr.s_addr = htonl(0);

to:

mask.sin_addr.s_addr = htonl(0x);

for the following snmpset command to work:

snmpset -l authPriv -A password -X password -a SHA -x AES -u authPrivUser
localhost
IP-FORWARD-MIB::inetCidrRouteStatus.1.4.20.20.0.0.16.2.0.0.1.4.10.10.0.1 i 4
IP-FORWARD-MIB::inetCidrRouteIfIndex.1.4.20.20.0.0.16.2.0.0.1.4.10.10.0.1 i
3 IP-FORWARD-MIB::inetCidrRouteMetric1.1.4.20.20.0.0.16.2.0.0.1.4.10.10.0.1
i 0 IP-FORWARD-MIB::inetCidrRouteType.1.4.20.20.0.0.16.2.0.0.1.4.10.10.0.1 i
4

I want to do the equivalent of: ip route add 20.20.0.0/16 via 10.10.0.1

I am new to SNMP and so I could be doing this wrong or making incorrect
assumptions. Perhaps there is an alternative method to adding static routes
that are not default gateways? Or is this simply a bug?

Thanks,
Daniel




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