SPF Lookup in Go

In this gist, We will check how we can extract SPF records in Go.

Prerequisite

Go version

$ go version
go version go1.13 linux/amd64

Dependency

DNS Library(https://github.com/miekg/dns)

Install dependency

$ go get github.com/miekg/dns 

spfLookup.go

Here you can change nameserver according to your requirement. I have specified here google’s name server (8.8.8.8). You can also use cloudflare’s nameserver (1.1.1.1)

Conclusion

You can make any DNS query with miekg/dns library. In the above script, we have looked up TXT Records and then we have searched for a string containing v=spf1.