BIND 10 #1073: root_addresses settings doesn't work for resolver

[BIND 10 Development]

#1073: root_addresses settings doesn't work for resolver
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                   Reporter:         |                 Owner:
  zhangcuiling                       |                Status:  new
                       Type:         |             Milestone:  Year 3 Task
  defect                             |  Backlog
                   Priority:  low    |            Resolution:
                  Component:         |             Sensitive:  0
  Unclassified                       |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0.0
            Defect Severity:         |           Total Hours:  0
  Medium                             |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jreed):

 This is the same as #1184. I will close that one. Here are its details:

 Resolver/root_addresses has default of ::1 port 53.

 But src/bin/resolver/main.cc has hard-coded l.root-server.net addresses
 (it used to use an f.root address hardcoded in asiolink).

 It logs:
 {{{

 2011-08-17 06:17:57.903 WARN  [b10-resolver.resolver]
 RESOLVER_NO_ROOT_ADDRESS no root addresses available

 }}}

 Attempting to change it fails with:

 {{{

 > config show Resolver/root_addresses
 Resolver/root_addresses []      list    (default)
 > config add Resolver/root_addresses
 > config show Resolver/root_addresses
 Resolver/root_addresses[0]/address      "::1"   string  (default)
 Resolver/root_addresses[0]/port 53      integer (default)
 > config commit
 Error: Address must contain both the IPaddress and port
 Configuration not committed

 }}}

 Setting both will allow it to commit. (It will not commit with just
 setting the address.)

 I restarted bind10 and it logged my new setting:

 {{{

 2011-08-17 06:28:07.947 INFO  [b10-resolver.resolver]
 RESOLVER_SET_ROOT_ADDRESS setting root address 192.5.5.241(53)

 }}}

 But tcpdump still shows it using the hardcoded entry. (In my several
 attempts, it always starts with the IPv4 address.)

 So to fix this ticket I propose:

 1) remove the hardcoded addresses from main.cc.

 2) Put the addresses into resolver.spec.pre.in.

 Note: Consider at this time to allow root_addresses to contain many
 addresses, so add all of them now.

 (Maybe even add a unused "label" or "name" for each of them so they can be
 identified. But that doesn't matter to me.)

 3) make resolver work for when the Resolver/root_addresses is changed,
 regardless if port is changed or not.

 (I think only a single port is useful, so don't need to allow configurable
 port per address, but it is fine if we continue this way.)

 4) make sure logging is correct. Probably the RESOLVER_NO_ROOT_ADDRESS
 will never be logged again after this is fixed.

-- 
Ticket URL: <http://bind10.isc.org/ticket/1073#comment:2>
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