Summer of Code 2005: improve libalias - part 1 of 2

With the first part of my previous Summer of Code work, we get:

-made libalias modular:

 -support for 'particular' protocols (like ftp/irc/etcetc) is no more
  hardcoded inside libalias, but it's available through external
  modules loadable at runtime

 -modules are available both in kernel (/boot/kernel/alias_*.ko) and
  user land (/lib/libalias_*)

 -protocols/applications modularized are: cuseeme, ftp, irc, nbt, pptp,
  skinny and smedia

-added logging support for kernel side

-cleanup

After a buildworld, do a 'mergemaster -i' to install the file libalias.conf
in /etc or manually copy it.

During startup (and after every HUP signal) user land applications running
the new libalias will try to read a file in /etc called libalias.conf:
that file contains the list of modules to load.

User land applications affected by this commit are ppp and natd:
if libalias.conf is present in /etc you won't notice any difference.

The only kernel land bit affected by this commit is ng_nat:
if you are using ng_nat, and it doesn't correctly handle
ftp/irc/etcetc sessions anymore, remember to kldload
the correspondent module (i.e. kldload alias_ftp).

General information and details about the inner working are available
in the libalias man page under the section 'MODULAR ARCHITECTURE
(AND ipfw(4) SUPPORT)'.

NOTA BENE: this commit affects _ONLY_ libalias, ipfw in-kernel nat
support will be part of the next libalias-related commit.

Approved by: glebius
Reviewed by: glebius, ru

1 files changed, 2 insertions, 7 deletions

diff --git a/sys/conf/files b/sys/conf/files
index 64e67bc..40f291d 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1744,16 +1744,11 @@ netinet/tcp_timer.c		optional inet
 netinet/tcp_usrreq.c		optional inet
 netinet/udp_usrreq.c		optional inet
 netinet/libalias/alias.c	optional libalias
-netinet/libalias/alias_cuseeme.c optional libalias
 netinet/libalias/alias_db.c	optional libalias
-netinet/libalias/alias_ftp.c	optional libalias
-netinet/libalias/alias_irc.c	optional libalias
-netinet/libalias/alias_nbt.c	optional libalias
-netinet/libalias/alias_pptp.c	optional libalias
 netinet/libalias/alias_proxy.c	optional libalias
-netinet/libalias/alias_skinny.c	optional libalias
-netinet/libalias/alias_smedia.c	optional libalias
 netinet/libalias/alias_util.c	optional libalias
+netinet/libalias/alias_old.c	optional libalias
+netinet/libalias/alias_mod.c	optional libalias
 netinet6/ah_aesxcbcmac.c	optional ipsec
 netinet6/ah_core.c		optional ipsec
 netinet6/ah_input.c		optional ipsec