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Browsing doesn't notice if a service unregisters/registers itself very quicky

Subject: Browsing doesn't notice if a service unregisters/registers itself very quicky
From: "Igor Seleznev" <email@hidden>
Date: Mon, 29 Jan 2007 16:42:55 +0300
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi,

I use mDNSResponder 107.6, with some critical patches got at this mailing list.

If I deregister a service and right after that register it again but with different port, most likely observers won't notice that re-allocation.

E.g., using the example from mDNSResponder/Clients, dns-sd:

1. Launch browsing:
~> ./dns-sd -B _tttttt._tcp

2. Launch two consecutive registrations in another terminal:
~> cat RUN
#!/bin/sh

NAME=nnnnnn
TYPE=_tttttt._tcp
PORT1=9898
PORT2=9899

echo `date` "FIRST REGISTRATION"
./dns-sd -R $NAME $TYPE local $PORT1 &
pid=`ps auxww | grep $NAME | grep -v grep | awk '{print $2}'`
sleep 5
[ "X$pid" != "X" ] && kill -9 $pid

echo `date` "SECOND REGISTRATION"
./dns-sd -R $NAME $TYPE local $PORT2 &
pid=`ps auxww | grep $NAME | grep -v grep | awk '{print $2}'`
sleep 5
[ "X$pid" != "X" ] && kill -9 $pid

~> sh ./RUN

The output of the browing process: Browsing for _tttttt._tcp Timestamp A/R Flags if Domain Service Type Instance Name 15:49:47.634 Add 2 2 local. _tttttt._tcp. nnnnnn 15:49:57.861 Rmv 0 2 local. _tttttt._tcp. nnnnnn

The output of the registration process: Mon Jan 29 15:49:46 MSK 2007 FIRST REGISTRATION Registering Service nnnnnn._tttttt._tcp.local port 9898 Got a reply for nnnnnn._tttttt._tcp.local.: Name now registered and active Mon Jan 29 15:49:51 MSK 2007 SECOND REGISTRATION RUN2: line 15: 26517 Killed ./dns-sd -R $NAME $TYPE local $PORT1 Registering Service nnnnnn._tttttt._tcp.local port 9899 Got a reply for nnnnnn._tttttt._tcp.local.: Name now registered and active

Please, let me know if you know a fix for this issue.
As a workaround one should add a delay between two registration processes.

Kind regards, Igor

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