OLA SLP Server

Proposal: Write our own SLP implementation to better support the needs of OLA w.r.t E1.33.

Pros

• Allows verbose logs which make debugging other SLP implementations easier.
• When run in DA mode, our own implementation would support an RPC notification mechanism so we discover devices faster.
• Faster release schedule.
• Will setuid to a non-root user for security.
• Work on Mac OS X without requiring reverse hostname lookups
• Avoid other problems with openslp

Cons

• Takes time
• Won't support SLPv1
• Will conflict with the existing slpd on installed systems. For example

# debian packages that use slpd and won't we able to be installed
$ apt-rdepends -r slpd | grep -v "^ "
libslp1
cups
bluez-cups
cups-dbg
cups-driver-gutenprint
cups-pdf
hpijs-ppds
hplip
hplip-dbg
hplip-gui
hplip-cups
splix
libroar-compat0
libroar-dev
roaraudio-dbg
libroar0
roaraudio
roaraudio-extra
libslp-dev
nis
slapd
bdii
bdii4
phamm-ldap
phamm-ldap-amavis
phamm-ldap-vacation
slapd-dbg
slapd-smbk5pwd
slptool

Of these the only one I'm concerned about is cups. However the latest E1.33 discussion is leaning towards running slp on a non-privileged port (so that Android & IOS devices) work. So this may be a non-issue.

Design

• SLPServer is the class which implements the SLP functionality.
• SLPDaemon is a class which wraps the SLPServer with a RPC & web server.
• DATracker keeps track of the known DAs on the network
• SLPStore holds the registations in SA or DA mode