defaults --domain and --tls-port via --host

README.md

@@ -54,7 +54,7 @@ General options are:
 
 Let's Encrypt specific (`--auto-cert`) options are:
 
-* `--domain` the domain you want to have your certificate generated for
+* `--domain` the domain you want to have your certificate generated for (if `--host` is not `fritz.box` it will default to the host name in `--host`)
 * `--email` your mail address you want to have registered with Let’s Encrypt
 * `--save` (optional) to save generated private key and acquired certificate
 * `--dns-provider` (default `manual`) to specify one of [lego's](https://github.com/xenolf/lego/tree/master/providers/dns) supported DNS providers. Note that you might have to set environment variables to configure your provider, e.g. `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `AWS_REGION` and `AWS_HOSTED_ZONE_ID`. I use name servers by AWS/Route53 and [inwx](https://github.com/xenolf/lego/blob/master/providers/dns/inwx/inwx.go), so I have to provide `INWX_USERNAME`, `INWX_PASSWORD`. I'm not sure if there is a overview, so for now you have to consult the [source](https://github.com/xenolf/lego/tree/master/providers/dns).
@@ -67,9 +67,9 @@ Options for non `--auto-cert` mode:
 
 These are some things I'd like to to in the future:
 
-* if `--tls-port` is not given, we should try to use `--host` before failing
 * add validation for private keys and certificate before uploading (avoid trying to upload garbage)
 * allow password protected private keys (when not provisioned by LE)
+* ~~if `--tls-port` is not given, we should try to use `--host` before failing~~
 * ~~add homebrew as a release target for goreleaser~~
 * ~~ask for `--user` if not provided (may be empty then) and/or add `--pw-only` flag~~
 * ~~allow other then DNS-01 Let's Encrypt challenges and make [legos](https://github.com/xenolf/lego) DNS providers available to make things even more automated!~~
@@ -88,4 +88,4 @@ Releases are done via Github Actions on push of a git tag. To make a release, ru
 ```terminal
 git tag va.b.c
 git push --tags
-```
+```

main.go

@@ -9,6 +9,7 @@ import (
 	"log"
 	"net/url"
 	"os"
+	"strconv"
 
 	"github.com/tisba/fritz-tls/fritzbox"
 )
@@ -130,6 +131,11 @@ func setupConfiguration() configOptions {
 
 	flag.Parse()
 
+	url, err := url.Parse(config.host)
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	if config.version {
 		log.Printf("fritz-tls %s (%s, %s)", version, date, commit)
 		os.Exit(0)
@@ -141,7 +147,11 @@ func setupConfiguration() configOptions {
 		}
 
 		if config.domain == "" {
-			log.Fatal("--domain is required with --auto-cert!")
+			if url.Hostname() != "fritz.box" {
+				config.domain = url.Hostname()
+			} else {
+				log.Fatal("--domain is required with --auto-cert!")
+			}
 		}
 
 		if config.email == "" {
@@ -163,14 +173,17 @@ func setupConfiguration() configOptions {
 		}
 	}
 
-	url, err := url.Parse(config.host)
-	if err != nil {
-		log.Fatal(err)
-	}
 	config.user = url.User.Username()
 	url.User = nil
 	config.host = url.String()
 
+	if config.tlsPort == 0 && url.Port() != "" {
+		config.tlsPort, err = strconv.Atoi(url.Port())
+		if err != nil {
+			log.Fatal(err)
+		}
+	}
+
 	if config.adminPassword == "" {
 		config.adminPassword = os.Getenv("FRITZTLS_ADMIN_PASS")
 	}