Squashed commit of the following:

commit bce2efe66d69d60b746b85df49974ca341723169
Author: Mark Andrews <marka@isc.org>
Date:   Mon Oct 29 12:59:25 2012 +1100

    use 'static dns_rdata_xxxx_t xxxx'

commit 704d3c29acbf2dd350a26f2df82a57cb077ba72e
Author: Mark Andrews <marka@isc.org>
Date:   Mon Oct 29 12:35:16 2012 +1100

    return ISC_R_NOTFOUND if private record length does not make sense

commit 7596610c12c5685336fc0909860173d2fae359af
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 21:41:17 2012 +1100

    check private->length == 5

commit 3836365a3e3e83b057bd940350f032279e080296
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 21:40:50 2012 +1100

    properly set private->length

commit a295778ac53109d39ef3a8b233751100edae678b
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 21:13:30 2012 +1100

    check dns_rdata_tostruct result

commit e33c37ca9112159e0b2363615bb018d27fa7d1a5
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 21:10:43 2012 +1100

    check remove/fopen/chmod return values

commit 3a675e0666aae25d1c51f51ec7bd3fbe25545aae
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:59:10 2012 +1100

    check isc_socket_accept result

commit 696923344f4b07ce0dba4cf2675b1cbb6eba7e8e
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:55:40 2012 +1100

    change variable scopes

commit b9e9d9ad58270271003e463f10744e0ceaf9ad97
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:53:19 2012 +1100

    check inet_pton return value

commit 70698e9589da77e3745efb6ea24b8830addd6ae4
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:52:40 2012 +1100

    break -> /* NOTREACHED */

commit 88de9de2e8e201ab2fef16a868f241e8206ea826
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:52:06 2012 +1100

    strcpy -> strlcpy

commit 6ba79c7cec0e48014cdfa76e8a9406b7a921556e
Author: Mark Andrews <marka@isc.org>
Date:   Sat Oct 27 20:51:26 2012 +1100

    check dns_rdata_tostruct return values