I actually needed something like this for a windows project. I did not submit it back to the group at the time because I didn't have time to create a general solution for the rest of the platforms, and because I relied on static linking to iphlpapi which would have been a new build dependency that was not in all windows platforms at the time. I would love it if slpd handled network changes on all platforms.
I've attached my version of slpd_win32.c, just look for NJW comments. If
the attachment doesn't go through, the relevant code is pretty simple:
I spawn a thread that uses iphlpapi to notify me whenever the network has
changed, at which I set a flag. In the main service loop where G_SIGALRM is
checked, I also check my new flag:
/* NJW Handle our signal as well*/
if (G_SIGRECON_DA)
{
//We don't want to lose any locally-registered services, but we want to
rediscover
//everyone. We'll reinit our socket lists, and then change our boot time
SLPDLog("Network changing, re-initializing sockets and re-discovering\n");
SLPDPropertyInit(G_SlpdCommandLine.cfgfile); //We need to re-init the
network interfaces, also inits the DA timestamp and active/passive discovery
triggers
SLPDIncomingInit();
SLPDOutgoingInit();
//Pretend we've rebooted and need to discover everyone
SLPDatabaseInit(&G_SlpdKnownDAs);
G_SIGRECON_DA = 0;
}
I also needed to add an extern for G_SlpdKnownDAs to make it compile.
--Nick
On Wed, Nov 10, 2010 at 6:47 AM, Roel van de Kraats
<r...@advancedcargo.eu>wrote:
> Dear all,
>
> Currently, slpd only looks for the available network interfaces once at
> start-up. In a situation where for instance dhcp is used, but no IP
> address was obtained yet when slpd starts, a (manual) restart of slpd is
> required to bind to that interface afterwards. Any local registrations
> (from applications using libslp) will be lost in that restart.
>
> Does anyone have the same experience? Do you happen to have any solution?
>
> A solution I can think of, is that slpd is notified with e.g. a signal
> to find the interfaces again, bind to the ones that were not already
> used before, locate DAs again, register services with the new address, etc.
>
> What are your ideas on this?
>
> Thanks in advance for thinking along..
>
> Best regards,
> Roel
>
>
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my_slpd_win32.c
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