GoSPF

Sender Policy Framework for Go

Usage

Get GoSPF and run all unit test:

$ go get github.com/gopistolet/gospf
$ cd $GOPATH/src/github.com/gopistolet/gospf
$ go test ./...

Command line tool

Compile the code:

$ go build -o spf github.com/gopistolet/gospf/gospf

You can run GoSPF in the console to validate an IP address against a domain: ./spf domain ip ["debug"]. e.g.:

$ ./spf google.com 66.249.80.0

With debug flag added, GoSPF will output the whole parsed SPF object.

Library

GoSPF is meant to be included in other projects. To use GoSPF you must create a new SPF instance (witch takes a domain and a gospf/dns interface). Once you have the SPF instance you can call CheckIP(ip string) on it, which will return a response following RFC 7208 2.6. Results of Evaluation (i.e. Neutral, Pass, SoftFail, Fail, ...)

Example:

package main

import (
    "fmt"
    "github.com/gopistolet/gospf"
    "github.com/gopistolet/gospf/dns"
)

func main() {

    domain := "google.com"
    ip     := "66.249.80.0"

    // create SPF instance
    spf, err := gospf.New(domain, &dns.GoSPFDNS{})
    if err != nil {
        fmt.Println(err)
        return
    }

    // check the given IP on that instance
    check, err := spf.CheckIP(ip)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Println(ip, "->", check)

}

Implementation

Directives
GoSPF supports all, include, a, mx, ip4 and ip6 mechanisms with the respective qualifiers +, ?, ~ and -. All implemented as defined in RFC 7208. Support for exists mechanism isn't implemented yet. Support for ptr mechanism is no priority:

Use of the ptr mechanism and the %p macro has been strongly discouraged (Sections 5.5 and 7.2). The ptr mechanism and the %p macro remain part of the protocol because they were found to be in use, but records ought to be updated to avoid them.

Modifiers
Currently only support for redirect modifier. (Other modifiers won't cause parse errors.)

Macros
Macros aren't supported (yet).

License

GoSPF is licensed under the BSD 2-clause “Simplified” License.

Author

Mathias Beke - denbeke.be