[asterisk-bugs] [JIRA] (ASTERISK-23813) DNS Manager (dnsmgr) does not restore port

[Michael L. Young (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-23813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael L. Young reassigned ASTERISK-23813:
-------------------------------------------

    Assignee:     (was: Michael L. Young)

> DNS Manager (dnsmgr) does not restore port
> ------------------------------------------
>
>                 Key: ASTERISK-23813
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23813
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/General
>    Affects Versions: 11.9.0
>         Environment: IAX2 registration to dynamic hostname, using dnsmgr.
>            Reporter: David Herselman
>
> Asterisk's dnsmgr module correctly switches the IP from 0.0.0.0 to whatever it should be but doesn't restore the port from 0 (when unavailable) to 4569 (when available).
> This appears to be a regression from ASTERISK-19106 (https://issues.asterisk.org/jira/browse/ASTERISK-19106) but *NOT* related to ASTERISK-23767 (https://issues.asterisk.org/jira/browse/ASTERISK-23767).
> We manage our Asterisk installations by installing and using the FreePBX GUI. FreePBX generates various iax configuration files which are pulled in by iax.conf so I've combined the switches and options in the exact order Asterisk's IAX module essentially sees them:
> /etc/asterisk/iax.conf:
> {noformat}
> [general]
> mailboxdetail=yes
> tos=ef
> disallow=all
> allow=ulaw
> allow=alaw
> allow=gsm
> calltokenoptional=10.0.0.0/255.0.0.0
> calltokenoptional=172.16.0.0/255.240.0.0
> calltokenoptional=192.168.0.0/255.255.0.0
> register=Alpha:*******@sip.crffac.golden-era.co.za
> allow=adpcm
> allow=g729
> allow=g723
> allow=g722
> allow=gsm
> allow=slin
> allow=speex
> allow=lpc10
> allow=ilbc
> allow=g726aal2
> allow=g726
> allow=h261
> allow=h263
> allow=h263p
> allow=h264
> videosupport=yes
> tcpenable=yes
> [guest]
> disallow=ulaw,alaw,adpcm
> type=user
> context=from-trunk
> [Omega]
> disallow=all
> host=dynamic
> username=Alpha
> secret=************
> requirecalltoken=yes
> qualify=yes
> allow=g729
> trunk=yes
> trunktimestamps=yes
> jitterbuffer=yes
> transfer=no
> type=friend
> context=from-internal
> {noformat}
> /etc/asterisk/dnsmgr.conf:
> {noformat}
> [general]
> enable=yes
> refreshinterval=300
> {noformat}
> To reproduce:
> 1. Create a DNS record with a short (eg 60 second) TTL (or simply reference sip.crffac.golden-era.co.za).
> 2. Don't bother configuring a trunk, the issue affects Asterisk's ability to perform a remote registration so simply add the following to /etc/asterisk/iax.conf (yes, use it 'as is' with the 'InvalidUser' and 'InvalidPassword'):
> {noformat}
> register=InvalidUser:InvalidPassword at sip.crffac.golden-era.co.za
> {noformat}
> 3. Issue 'iax2 reload' to have Asterisk reload the configuration file and verify that Asterisk is attempting the registration with the 'iax2 show registry' command:
> {noformat}
> sip*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 165.145.108.145:4569  Y       InvalidUse  <Unregistered>             60  Request Sent
> 1 IAX2 registrations.
> {noformat}
> 4. Break your DNS resolution and wait about 2 minutes for the DNS record to expire and for Asterisk to retry the registration. Perhaps simply load a firewall rule to drop outgoing DNS requests:
> {noformat}
> iptables -I OUTPUT -p udp --dport 53 -j DROP
> {noformat}
> 5. Review the Asterisk registration configuration:
> {noformat}
> sip*CLI> module unload chan_iax2
> Unloaded chan_iax2
> sip*CLI> module load chan_iax2
> Loaded chan_iax2
> [2014-06-03 08:42:24] ERROR[24332]: netsock2.c:269 ast_sockaddr_resolve: getaddrinfo("sip.crffac.golden-era.co.za", "(null)", ...): Temporary failure in name resolution
> [2014-06-03 08:42:24] WARNING[24332]: acl.c:833 resolve_first: Unable to lookup 'sip.crffac.golden-era.co.za'
> sip*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> (null)                Y       InvalidUse  <Unregistered>             60  Unregistered
> 1 IAX2 registrations.
> {noformat}
> 6. Restore DNS resolution:
> {noformat}
> [root at sip ~]# iptables -D OUTPUT -p udp --dport 53 -j DROP
> [root at sip ~]# host sip.crffac.golden-era.co.za
> sip.crffac.golden-era.co.za is an alias for dynamic2.crffac.golden-era.co.za.
> dynamic2.crffac.golden-era.co.za has address 165.145.108.250
> {noformat}
> 7. Asterisk's dnsmgr restores the IP but leaves the port as 0:
> {noformat}
> [2014-06-03 08:43:14] NOTICE[28314]: dnsmgr.c:215 dnsmgr_refresh: dnssrv: host 'sip.crffac.golden-era.co.za' changed from (null) to 165.145.108.145:0
> sip*CLI> iax2 show registry
> Host                  dnsmgr  Username    Perceived             Refresh  State
> 165.145.108.145:0     Y       InvalidUse  <Unregistered>             60  Request Sent
> 1 IAX2 registrations.
> {noformat}



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