git » spf » commit 27071c8

diff --git a/cmd/spf-check/.gitignore b/cmd/spf-check/.gitignore
new file mode 100644
index 0000000..1bd1b55
--- /dev/null
+++ b/cmd/spf-check/.gitignore
@@ -0,0 +1 @@
+spf-check
diff --git a/cmd/spf-check/spf-check.go b/cmd/spf-check/spf-check.go
new file mode 100644
index 0000000..3967e69
--- /dev/null
+++ b/cmd/spf-check/spf-check.go
@@ -0,0 +1,64 @@
+// +build ignore
+
+// Command line tool to perform SPF checks.
+//
+// For development and experimentation only.
+// No backwards compatibility guarantees.
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"net"
+	"os"
+
+	"blitiri.com.ar/go/spf"
+)
+
+var (
+	debug   = flag.Bool("debug", false, "include debugging output")
+	dnsAddr = flag.String("dns_addr", "", "address of the DNS server to use")
+)
+
+func main() {
+	flag.Usage = func() {
+		fmt.Printf("Usage: spf-check [options] 1.2.3.4 name@sender.com\n\n")
+		flag.PrintDefaults()
+	}
+
+	flag.Parse()
+	args := flag.Args()
+	if len(args) < 2 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	opts := []spf.Option{}
+	if *debug {
+		traceF := func(f string, a ...interface{}) {
+			fmt.Printf("debug: "+f+"\n", a...)
+		}
+		opts = append(opts, spf.WithTraceFunc(traceF))
+	}
+
+	if *dnsAddr != "" {
+		dialFunc := func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return (&net.Dialer{}).DialContext(ctx, network, *dnsAddr)
+		}
+		opts = append(opts, spf.WithResolver(
+			&net.Resolver{
+				PreferGo: true,
+				Dial:     dialFunc,
+			}))
+	}
+
+	ip := net.ParseIP(args[0])
+	sender := args[1]
+	fmt.Printf("Sender: %v\n", sender)
+	fmt.Printf("IP: %v\n", ip)
+
+	r, err := spf.CheckHostWithSender(ip, "", sender, opts...)
+	fmt.Printf("Result: %v\n", r)
+	fmt.Printf("Error: %v\n", err)
+}