SMB v2 support

[Shira]

# mount.cifs //192.168.0.2/RecalboxRoms /recalbox/share/roms -o username=roms,password=roms
mount error(112): Host is down
Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)

[Shira]

@substring got it working, we simply have to add "vers=2.0" (or 2.1 / 3.0 /3.02) to the mount commands, i.e:

sharenetwork_smb1=ROMS@192.168.0.2:RecalboxRoms:username=roms,password=roms,vers=2.0
sharenetwork_smb2=SAVES@192.168.0.2:RecalboxSaves:username=roms,password=roms,vers=2.0

https://blogs.technet.microsoft.com/josebda/2013/10/02/windows-server-2012-r2-which-version-of-the-smb-protocol-smb-1-0-smb-2-0-smb-2-1-smb-3-0-or-smb-3-02-are-you-using/

1.0: Win 2k/XP/Server 2003/Server 2003 R2
2.0: Vista SP1/Server 2008
2.1: Win7/Server 2008 R2
3.0: Win8/Server 2012 (w10?)
3.02: Win8.1/Server2012 (w10?)

[Shira]

Edited the Wiki with these instructions:

https://github.com/recalbox/recalbox-os/wiki/Load-your-roms-from-a-network-shared-folder-(EN)

[Shira]

for KODI SMB2+: SMB v2 on KODI

[Substring]

@shira great job !
Still, it's a shame it can't properly "autodetect" the protocol version

[toniosj]

@shira Do you use Windows10? Does dosbox work with shared folder from Windows 10?

[Shira]

@toniosj Yes Win10. Dosbox?

[toniosj]

@shira Since 17.12.2, dosbox doesnt detect my roms folder shared from Windows. All rest emulators work perfectly. And you?

[Shira]

@toniosj hm I don't have any dosbox games to test

[toniosj]

@shira I've send you a chat.