Can Go\'s Standard Library `LookupTXT` Function Specify a Custom DNS Server?

Why the Go Standard Library Lookup Function Lacks Server Parameterization*

The nslookup command allows for specifying a DNS server, such as nslookup somewhere.com some.dns.server. However, the Go standard library's dnsclient function appears to only load config from /etc/resolv.conf.

One might wonder if there's a standard library function that provides the equivalent functionality, such as:

func LookupTXT(name string, dnsServer string) (txt []string, err error)

Answer

The Go standard library does not provide such a function that takes an explicit DNS server parameter. This is primarily due to its commitment to providing a consistent and reliable interface for name resolution, even in scenarios where there are multiple potential DNS servers.

Instead, the Lookup*** functions rely on the default resolver configuration specified in /etc/resolv.conf. This approach ensures a consistent resolution mechanism across the board, avoiding potential inconsistencies or complexities arising from manual server parameterization.

Alternative Library

While the standard library does not provide a Lookup*** function with a server parameter, there are third-party libraries that offer similar functionality. For instance, the github.com/miekg/dns library provides more granular control over DNS queries, including the ability to specify a target DNS server.

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