--ifconfig-push should warn on topology

[Gert Döring]

if people have ccd/ configs containing

--ifconfig-push 10.0.0.8 10.0.0.1

and move to --topology subnet , this will explode as the client needs to see --ifconfig-push 10.0.0.8 255.255.255.0 (or the like) instead.

We currently just pass on the option, and not issue a warning - and then the client dies on ifconfig. We should at least warn...

[Gert Döring]

The wonders of tun.c

We do have "ifconfig_sanity_check()" which (tries to) do exactly this, but for the opposite case - NET30 and P2P, and I'm not sure it does the byte ordering correctly...

/*
 * If !tun, make sure ifconfig_remote_netmask looks
 *  like a netmask.
 *
 * If tun, make sure ifconfig_remote_netmask looks
 *  like an IPv4 address.
 */
static void
ifconfig_sanity_check (bool tun, in_addr_t addr, int topology)
{
...

[David Sommerseth]

Patches are on the mailing list ... ​https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg13462.html

[updated to point at the proper patches]

[Gert Döring]

That did not go as planned :-( - we have patches, but neglected them to the point of no longer applying.

I am bumping the ticket to release/2.6, as we want to revisit the patches, but it's not something we want strongly enough in 2.5 to delay the release.

[Gert Döring]

I am bumping the ticket to release/2.7, as we want to revisit the patches, but it's not something we want(ed) strongly enough in 2.6 to delay the release.