Re: Unable to compile net-snmp due to netlink API change

On 4/2/24 01:49, Craig Small via Net-snmp-coders wrote:
> Hello All,
>    I was attempting to compile the git head of net-snmp. One big change 
> is that uses netlink sockets instead of reading /proc/net/*
> 
> The issue is the API is different to the library I can see.
> 
> mibgroup/mibII/tcpTable.c:631:12: error: too few arguments to function 
> ‘nl_geterror’
>    631 |     return nl_geterror();
>        |            ^~~~~~~~~~~
> 
> And indeed nl_geterror() requires a int:
> https://github.com/tgraf/libnl/blob/master/include/netlink/errno.h#L56 
> <https://github.com/tgraf/libnl/blob/master/include/netlink/errno.h#L56>
> extern const char * nl_geterror(int);
> 
> So I'm not exactly sure what netlink library is being used here. I 
> cannot disable this feature either:
> mibgroup/if-mib/data_access/interface_linux.c:27:2: error: #error 
> libnl-3 is required. Please install the libnl-3 and libnl-route-3 
> development packages and remove --without-nl from the configure options 
> if necessary.
>     27 | #error libnl-3 is required. Please install the libnl-3 and 
> libnl-route-3 development packages and remove --without-nl from the 
> configure options if necessary.
>        |  ^~~~~

The Net-SNMP configure script detects whether libnl-1 / libnl-3 is
present. The above error message comes from the libnl-3 compat code and
hence means that libnl-3 was not detected. I'm referring to this code:

         if test "x$ac_cv_header_netlink_netlink_h" = xyes; then
             AC_EGREP_HEADER([nl_socket_free], [netlink/socket.h],
                             [AC_DEFINE([HAVE_LIBNL3], [1],
                             [Define to 1 if <netlink/netlink.h> 
provides the
                             libnl3 API])])
         fi

Can you please check the configure script logs to see why libnl-3 was
not detected?

Thanks,

Bart.


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