Hello,
I have an application where we use the slpd. When the system is
started, however, our network interfaces are not ready when the init.d scripts
are run. So, a network aware application needs to restart the daemon
when the network is ready. The network interface needed to be binded
is the 0.0.0.0 interface. But if the daemon, again is started too
early, although
the network is up, this error occurs.
****************************************
Mon Jan 26 02:25:39 1970
SLPD daemon started
****************************************
Command line = /usr/sbin/slpd
Using configuration file = /etc/slp.conf
Using registration file = /etc/slp.reg
Listening on loopback TCP...
Listening on loopback UDP...
Couldn't bind to (IPv4) multicast for interface 0.0.0.0 (No such device)
Unicast socket on 0.0.0.0 ready
Agent Interfaces = 0.0.0.0
Startup complete entering main run loop ...
Through the communication interface, there is no way of querying what
the status of the slpd is (which interfaces are available, etc.). To remedy the
problem I made a small hack to exit the daemon if the multicast stuff failed.
As the damon is today, I understand there is no possibility to re-iterate the
network interfaces. A restart is needed for this case. Could there not be a
config parameter or switch to instruct the daemon to exit if it cannot
fulfill the
config's parameters as expected? Or an extra query api to the daemon to
determine net interface properties?
diff --git a/slpd/slpd_incoming.c b/slpd/slpd_incoming.c
index bbb28cf..dc8869d 100644
--- a/slpd/slpd_incoming.c
+++ b/slpd/slpd_incoming.c
@@ -721,10 +721,13 @@ int SLPDIncomingInit(void)
sizeof(addr_str)));
}
else
+ {
SLPDLog("Couldn't bind to (IPv4) multicast for interface
%s (%s)\n",
SLPNetSockAddrStorageToString(&myaddr, addr_str,
sizeof(addr_str)),
strerror(errno));
+ return 1;
+ }
}
else if (SLPNetIsIPV6() && myaddr.ss_family == AF_INET6)
{
Cheers,
Ryan
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