Patches item #1811125, was opened at 2007-10-10 15:36
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Category: core
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Phil D'Amore (ptdamore)
Assigned to: Nobody/Anonymous (nobody)
Summary: Multi-interface friendly advertised_address functionality
Initial Comment:
The attached patch extended the idea of an advertised address so that it is
possible to bind such an address to each listen= statement. Syntax-wise, it
works like this:
listen=[proto:]host[:port][ AS host[:port]]
This new AS host[:port] syntax binds the advertised address specifically to the
corresponding socket_info structure. If such an address is specified, it will
be used before the address specified as advertised_address, or set in the
set_advertised_address function. If it is not specified, then those methods
work as before.
The core has been modified so that address tuples using the advertised address
work interchangably with the real address where you'd expect them to.
grep_sock_info and find_si have been updated to allow this. Therefore, it is
not nexessary to explicitly name your advertised address on an alias= line.
The following are now equivalent:
force_send_socket(udp:adv_address:adv_port);
force_send_socket(udp:real_address:real_port);
Note we don't specify protocol on the advertised address. The way I see
things, it makes no sense to advertise a different protocol, so it inherits the
protocol of the socket.
Via construction is affected in the same way that the old global
advertised_address does, except the Via is written properly for the socket used
to send the message.
Lump substitution is also affected. The following lump substitutions are aware
of this new facility:
SUBST_RCV_IP
SUBST_RCV_PORT
SUBST_RCV_ALL
SUBST_SND_IP
SUBST_SND_PORT
SUBST_SND_ALL
As a result of this, I was able to stop using record_route_preset, and just use
standard record_route. This winds up working much better, because double-rr
works properly, and add_rr_param now works as expected for me, where it was a
problem using record_route_preset.
Additionally, registrar and usrloc have been modified:
registrar - update the add_sock_hdr function to put the advertised address in
the message instead of the real address. This allows registration information
to be replicated between multi-homed proxies, and the correct interface on the
peer can be used.
usrloc - update db_insert_ucontact to store the advertised address in the
database instead of the real address. Same reasoning as the mods to registrar.
This code was originaly written for 1.1.x, and I've been using it quite happily
for about a year now. I ported it to 1.2 with the hope of getting it submitted
for 1.3, but time got the better of me. I've now ported this to HEAD, and have
tested that the functionality still works as compared to in my production 1.1.1
setup. So at this point, I'd like to get this patch in here and hopefully
someone can think about it for 1.4.
Any constructive comments on the functionality of the implementation would also
be welcome.
Here is a (hopefully complete) breakdown of the modified files. No files were
added:
cfg.lex - new listen syntax
cfg.y - new listen syntax
ip_addr.h - socket_info and socket_id expanded to hold the advertised address
data.
main.c - update for new add_listen_iface prototype
msg_translator.c - lump and via support.
socket_info.[ch] - add_listen_interface updated to accept the advertised
information, and socket2str expanded to accept a flag to request the real
address or the advertised address
socket_info.c - grep_sock_info and find_si updated to work with the advertised
addresses.
modules/lcr/lcr_mod.c - updated to call socket2str the new way.
modules/registrar/reg_mod.c - update to place the advertised address in the
socket info header.
modules/usrloc/ucontact.c - updated to save the advertised address in the
database.
modules/usrloc/ul_mi.c - updated to return the advertised address of the socket.
----------------------------------------------------------------------
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