9 Jun
2011
9 Jun
'11
2:08 p.m.
2011/6/9 Iñaki Baz Castillo <ibc(a)aliax.net>et>:
According to NAPTR:
~$ host -t naptr oversip.net
oversip.net has NAPTR record 5 50 "S" "SIPS+D2T" ""
_sips._tcp.oversip.net.
oversip.net has NAPTR record 10 50 "S" "SIP+D2T" ""
_sip._tcp.oversip.net.
oversip.net has NAPTR record 20 50 "S" "SIP+D2U" ""
_sip._udp.oversip.net.
oversip.net has NAPTR record 40 50 "S" "SIP+D2S" ""
_sip._sctp.oversip.net.
oversip.net has NAPTR record 50 50 "S" "SIPS+D2S" ""
_sips._sctp.oversip.net.
So it should try TLS over TCP first, if it fails try TCP and if it
fails try UDP.
However it just uses UDP, why??
This is the Kamailio's log about DNS resolution for the above request
(note that I've restarted kamailio before the request in order to
clean any possible DNS cache):
DEBUG: <core> [dns_cache.c:567]: dns_hash_find(oversip.net(11), 35), h=956
DEBUG: <core> [resolve.c:924]: get_record: skipping 0 NS (p=0x826fdd,
end=0x826fdd)
DEBUG: <core> [resolve.c:940]: get_record: parsing 0 ARs (p=0x826fdd,
end=0x826fdd)
DEBUG: <core> [dns_cache.c:1777]: dns_get_related(0x7f359f68db50
(oversip.net, 35), 35, *(nil)) (0)
DEBUG: <core> [dns_cache.c:870]: dns_cache_add: adding oversip.net(11)
35 (flags=0) at 956
DEBUG: <core> [dns_cache.c:567]:
dns_hash_find(_sip._udp.oversip.net(21), 33), h=23
DEBUG: <core> [resolve.c:924]: get_record: skipping 0 NS (p=0x826f0a,
end=0x826f0a)
DEBUG: <core> [resolve.c:940]: get_record: parsing 0 ARs (p=0x826f0a,
end=0x826f0a)
DEBUG: <core> [dns_cache.c:1777]: dns_get_related(0x7f359f68de08
(_sip._udp.oversip.net, 33), 33, *(nil)) (0)
DEBUG: <core> [dns_cache.c:870]: dns_cache_add: adding
_sip._udp.oversip.net(21) 33 (flags=0) at 23
DEBUG: <core> [dns_cache.c:2362]: dns_srv_get_nxt_rr(0x7f359f68de08,
0, 0, 1367445037): selected 0/1 in grp. 0 (rand_w=0, rr=0x7f359f68de60
p=0 w=0 rsum=0)
DEBUG: <core> [dns_cache.c:567]: dns_hash_find(sip.oversip.net(15), 1), h=400
DEBUG: <core> [resolve.c:924]: get_record: skipping 0 NS (p=0x826ef1,
end=0x826ef1)
DEBUG: <core> [resolve.c:940]: get_record: parsing 0 ARs (p=0x826ef1,
end=0x826ef1)
DEBUG: <core> [dns_cache.c:1777]: dns_get_related(0x7f359f68def0
(sip.oversip.net, 1), 1, *(nil)) (0)
DEBUG: <core> [dns_cache.c:870]: dns_cache_add: adding
sip.oversip.net(15) 1 (flags=0) at 400
DEBUG: <core> [dns_cache.c:2982]: dns_a_resovle(sip.oversip.net, 0) returning 0
DEBUG: <core> [dns_cache.c:3236]:
dns_srv_resolve_ip("_sip._udp.oversip.net", 0, 0), ret=0,
ip=91.121.79.216
DEBUG: <core> [dns_cache.c:3358]: dns_sip_resolve(oversip.net, 0, 0),
srv0, ret=0
As per these logs I understand that no NAPTR record is taking place,
but just SRV for _sip._udp.oversip.net.
--
Iñaki Baz Castillo
<ibc(a)aliax.net>