[WLUG] GCC compiling help - No TUN device

[Lane Hoy]

Jay,

The tun/tap functionality is related to network interface bridging and is
probably part of the linux kernel packages on your system.  My first guess
is that you need to install the kernel source packages and kernel header
packages.

The tun/tap functionality may be obsolete in the current kernels on
www.kernel.org.  I have not heard about that set of add on kernel modules
in years.  I do remember seeing tun/tap as a kernel compile option a very
long time ago.

Lane Hoy

On Fri, Jul 20, 2018, 01:45 Jay Nugent <jjn at nuge.com> wrote:

> Greetings fellow LUG folk,
>     It has been 10 years since I have mucked around compiling C code, and
> as is usually the case, roadblocks and hurdles pop up that stretch my
> limits.
>
>     I am trying to compile the latest version of JNOS (Packet Radio
> software) on a 64-bit machine running Debian Stretch 4.13.0-45-generic.
>
>     I have tried to find what package contains the TUN device, and simply
> APT INSTALL it, but it has been no joy.  I am leary to just make a node
> (mknod) and I'm not entiry sure that is what is needed.  Searching Google
> has just added 100 more doubts into which is the correct way to go?
>
>     Once JNOS is compiled, I will need to set up a Point-to-Point Tunnel
> between the Linux kernel and the JNOS application.  This is typically done
> with the commands:
>
> (within JNOS)
>     attach tun tun0 1500 0
>     ifconfig tun0 ipaddress 192.168.2.1
>     ifconfig tun0 mtu 1500
>
> (then within Linux)
>     ifconfig tun0 192.168.2.2 pointtopoint 192.168.2.1 mtu 1500 up
>
>
>     But there is no TUN device on Linux so the ifconfig fails.  And I
> belive since the TUN device doesn't exist on the Linux box, that is why
> the compile of JNOS is failing.  At least the ERROR messages during the
> compile seem to indicate so...
>
>     The compile goes along well until it needs to work with the TUN
> interface (tun.c).  Then it spews some errors, and exits without creating
> the executable:
>
> ....
> ....
> gcc -DUNIX -g3   -DDEBUG -Wall   -c -o devparam.o devparam.c
> gcc -DUNIX -g3   -DDEBUG -Wall   -c -o md5.o md5.c
> gcc -DUNIX -g3   -DDEBUG -Wall   -c -o tun.o tun.c
> In file included from netuser.h:38:0,
>                   from tcp.h:26,
>                   from iface.h:25,
>                   from tun.c:26:
> socket.h:85:21: error: expected identifier before numeric constant
>   #define SOCK_STREAM 0
>                       ^
> In file included from /usr/include/x86_64-linux-gnu/sys/socket.h:33:0,
>                   from /usr/include/linux/if.h:27,
>                   from tun.c:41:
> /usr/include/x86_64-linux-gnu/bits/socket.h:174:8: error: redefinition of
> ‘struct sockaddr’
>   struct sockaddr
>          ^~~~~~~~
> In file included from socket.h:22:0,
>                   from netuser.h:38,
>                   from tcp.h:26,
>                   from iface.h:25,
>                   from tun.c:26:
> sockaddr.h:13:8: note: originally defined here
>   struct sockaddr {
>          ^~~~~~~~
> <builtin>: recipe for target 'tun.o' failed
> make: *** [tun.o] Error 1
> root at SkyLake2:~/jnos-source#
>
>
>     Any compile savy folk have any suggestions?  I think if I can
> determine
> how to install the package that contains the /dev/tun it *may* get me over
> this hurdle.
>
>
>     Thanks!
>        --- Jay
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