[ldns-users] PATCH: changing and padding the SOA serial in ldns-read-zone

[Paul Wouters]

Hi,

We do some zone manipulation using ldns-read-zone, and one issue we keep
running into is that we want to re-write the serial number, but we don't
want to rewrite large zone files all the times when the serial number
needs to grow a digit. That way, we can use mmap() to quickly just update
the serial. (of course, we're talking unsigned zones here)

I tried to do it using the existing functions, but got quite confused
with all the ldns_rr_* related buffer functions, so I ended up just
using an ldns_buffer->_data call directly and some uglt str tokking.

I hope someone can take this patch and write proper code for it. Or even
better, add a function where we can just update the soa of an ldns_zone
struct (which I had hoped ldns_zone_set_soa() could do, but AFAIK that's
not the case)

Serial numbers with more then 10 digits will be truncated. Signed zones
are not touched. If -s (strip DNSSEC) is specified, it pads the serial
to 10 characters. If -S <serial> is specified, the serial is changed as 
well.

[paul at thinkpad pri]$ cat example.com 
example.com.    IN      SOA     ns1.xelerance.net. hostmaster.xelerance.net. (
 			666 ; serial
                         18000 ; refresh
                         3600  ; retry
                         864000 ; expire
                         3600 ) ; minimum
                 IN      NS      ns0.xelerance.nl.
 		IN	MX	10	tla.xelerance.com.
                 IN      A       193.110.157.130
[paul at thinkpad pri]$ ldns-read-zone  example.com 
example.com.	3600	IN	SOA	ns1.xelerance.net. hostmaster.xelerance.net. 666 18000 3600 864000 3600
example.com.	3600	IN	NS	ns0.xelerance.nl.
example.com.	3600	IN	MX	10 tla.xelerance.com.
example.com.	3600	IN	A	193.110.157.130
[paul at thinkpad pri]$ ldns-read-zone -s example.com 
example.com.	3600	IN	SOA	ns1.xelerance.net. hostmaster.xelerance.net.         666 18000 3600 864000 3600
example.com.	3600	IN	A	193.110.157.130
example.com.	3600	IN	MX	10 tla.xelerance.com.
example.com.	3600	IN	NS	ns0.xelerance.nl.
[paul at thinkpad pri]$ ldns-read-zone -s -S 20111014 example.com 
example.com.	3600	IN	SOA	ns1.xelerance.net. hostmaster.xelerance.net.    20111014 18000 3600 864000 3600
example.com.	3600	IN	A	193.110.157.130
example.com.	3600	IN	MX	10 tla.xelerance.com.
example.com.	3600	IN	NS	ns0.xelerance.nl.

Paul
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