[asterisk-dev] [Code Review] 4474: core: Add basic DNS API implementation

[Mark Michelson]

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/trunk/include/asterisk/dns_core.h
<https://reviewboard.asterisk.org/r/4474/#comment25268>

    First off, apologies for bringing this up now rather than earlier, but I did not think of this until over this past weekend.
    
    The main reason that ast_dns_resolve_async() returns an ast_dns_query is so that the query can be canceled by calling ast_dns_resolve_cancel(). The problem is that there is nothing that prevents the caller of ast_dns_resolve_async() from doing unwanted operations such as adding DNS results/records, or attempting to read results from the query while an async thread is currently writing them.
    
    What I propose here is returning something other than an ast_dns_query from this function. The structure returned from ast_dns_resolve_async() could be passed to ast_dns_resolve_cancel(), and that's it. This would be similar to how ast_dns_resolve_recurring() works.


- Mark Michelson


On March 16, 2015, 2:33 p.m., Joshua Colp wrote:
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> https://reviewboard.asterisk.org/r/4474/
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> (Updated March 16, 2015, 2:33 p.m.)
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> Review request for Asterisk Developers.
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> Bugs: ASTERISK-24834
>     https://issues.asterisk.org/jira/browse/ASTERISK-24834
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> Repository: Asterisk
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> Description
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> This change implements the basic API as described on the DNS API wiki page. Minimal changes have been made as required based on real usage and getting a feel for it. As it is the core functionality is present. Resolvers can register, queries can be made (async / sync).
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> As the API was basically copy/pasted from the wiki page there still remain stubs to be filled in for higher level functionality (such as parsing and query sets).
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> Diffs
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>   /trunk/main/dns_tlsa.c PRE-CREATION 
>   /trunk/main/dns_srv.c PRE-CREATION 
>   /trunk/main/dns_recurring.c PRE-CREATION 
>   /trunk/main/dns_query_set.c PRE-CREATION 
>   /trunk/main/dns_naptr.c PRE-CREATION 
>   /trunk/main/dns_core.c PRE-CREATION 
>   /trunk/include/asterisk/dns_tlsa.h PRE-CREATION 
>   /trunk/include/asterisk/dns_srv.h PRE-CREATION 
>   /trunk/include/asterisk/dns_resolver.h PRE-CREATION 
>   /trunk/include/asterisk/dns_recurring.h PRE-CREATION 
>   /trunk/include/asterisk/dns_query_set.h PRE-CREATION 
>   /trunk/include/asterisk/dns_naptr.h PRE-CREATION 
>   /trunk/include/asterisk/dns_internal.h PRE-CREATION 
>   /trunk/include/asterisk/dns_core.h PRE-CREATION 
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> Diff: https://reviewboard.asterisk.org/r/4474/diff/
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> Testing
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> Ran DNS unit tests as done by Mark, they are happy.
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> 
> Thanks,
> 
> Joshua Colp
> 
>

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