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DNS Library for Mac OS X?

We (FSS) are in need of a dns resolver library for Mac OS X that has a timeout, resolves MX records, is mt-safe, and optionally supports IPv6. We've found FireDNS, but it's GPL. There's also c-ares but it lacks the ability (seemingly) to handle IPv6.

Suggestions, anyone?

2 Responses to "DNS Library for Mac OS X?"

  1. DJBDNSBIND also includes one. BIND is bundled with OS X, so it may be your best bet.

  2. BIND isn't mt-safe. DJBDNS doesn't seem to have any license attached, I'm not touching that one.