Getting DNS Server Address (SRV Records)

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Created Jun ’15

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I have a need to get the local DNS server address in iOS. I need this because I need to query for SRV records for a game. I can not find any calls that allows me to query SRV records so I must craft the DNS request and send it. Since I cant find a way to do this, I have to query Google DNS which has its own set of problems, most of which deal with it being blocked by ISP's or countries as a whole. How can I either get the local DNS server address or query for SRV records? Thank you for your help!

Ray

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Answer 1

donarb OP

Jun ’15

Apple has sample code for the Mac that does this. According to the instructions, it should also work with iOS.

https://developer.apple.com/library/mac/samplecode/SRVResolver/Introduction/Intro.html

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Answer 2

Thomas Tempelmann OP

Oct ’24

In case others run into this, let me add this warning about the SRVResolver code:

In the function QueryRecordCallback, the code first makes some assertions before checking the errorCode. That's likely to cause problems because if you get an error (such as if a user doesn't give your app permission to use the network calls), the asserts may get triggered. To fix this, move the assert calls inside the code that checks for error == 0.

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