build(deps): Bump step-security/harden-runner from 2.22.0 to 2.22.1

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.22.0 to 2.22.1.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](https://github.com/step-security/harden-runner/compare/351661ca32ac09a36dc5ee2d536e3128f2a3c8ed...ccd8616d44fd3846e67624a50d5aad6d37bf2d25)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.22.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
+      uses: step-security/harden-runner@ccd8616d44fd3846e67624a50d5aad6d37bf2d25 # v2.22.1
       with:
         egress-policy: audit
 
@@ -47,7 +47,7 @@ jobs:
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
+      uses: github/codeql-action/init@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -58,7 +58,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
+      uses: github/codeql-action/autobuild@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 https://git.io/JvXDl
@@ -72,4 +72,4 @@ jobs:
     #   make release
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
+      uses: github/codeql-action/analyze@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2

.github/workflows/dependency-review.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
+        uses: step-security/harden-runner@ccd8616d44fd3846e67624a50d5aad6d37bf2d25 # v2.22.1
         with:
           egress-policy: audit
 

.github/workflows/go.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
+      uses: step-security/harden-runner@ccd8616d44fd3846e67624a50d5aad6d37bf2d25 # v2.22.1
       with:
         egress-policy: audit
 

.github/workflows/release.yaml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
+      uses: step-security/harden-runner@ccd8616d44fd3846e67624a50d5aad6d37bf2d25 # v2.22.1
       with:
         egress-policy: audit
 

.github/workflows/scorecards.yml

@@ -36,7 +36,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
+        uses: step-security/harden-runner@ccd8616d44fd3846e67624a50d5aad6d37bf2d25 # v2.22.1
         with:
           egress-policy: audit
 
@@ -76,6 +76,6 @@ jobs:
 
       # Upload the results to GitHub's code scanning dashboard.
       - name: "Upload to code-scanning"
-        uses: github/codeql-action/upload-sarif@ff2f1c621b7f889edc0d3c761ac2e6a3f8cdb0dd # v4.37.7
+        uses: github/codeql-action/upload-sarif@2892aa5e19bbd11bc0cff5427e3b750a04d9e3c2 # v4.38.2
         with:
           sarif_file: results.sarif

go.mod

@@ -1,22 +1,22 @@
 module github.com/decke/smtprelay
 
 require (
-	github.com/DeRuina/timberjack v1.4.6
-	github.com/chrj/smtpd v1.0.0
+	github.com/DeRuina/timberjack v1.4.8
+	github.com/chrj/smtpd v1.0.1
 	github.com/fsnotify/fsnotify v1.10.1
 	github.com/google/uuid v1.6.0
 	github.com/peterbourgon/ff/v3 v3.4.0
 	github.com/rs/zerolog v1.35.1
 	github.com/stretchr/testify v1.12.1
-	golang.org/x/crypto v0.55.0
+	golang.org/x/crypto v0.58.0
 )
 
 require (
-	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/compress v1.18.7 // indirect
 	github.com/mattn/go-colorable v0.1.15 // indirect
 	github.com/mattn/go-isatty v0.0.22 // indirect
 	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/sys v0.49.0 // indirect
 )
 
-go 1.25.0
+go 1.26.0

go.sum

@@ -1,15 +1,15 @@
-github.com/DeRuina/timberjack v1.4.6 h1:ixA4vWcXt160M69ZbhUTLfSOOlEtEE+7hHEgDWIXUiI=
-github.com/DeRuina/timberjack v1.4.6/go.mod h1:RLoeQrwrCGIEF8gO5nV5b/gMD0QIy7bzQhBUgpp1EqE=
-github.com/chrj/smtpd v1.0.0 h1:jChSfLzAhrSxTky0EZ6oW+UKiqdnepdknWYRkPeA+ZE=
-github.com/chrj/smtpd v1.0.0/go.mod h1:zEP61gNDlWp/jdUqBcq/ykIbgOERyRvwfMsRLl3h9gM=
+github.com/DeRuina/timberjack v1.4.8 h1:V7SIoCzkyWD93WmyKECSX+tMu/hLqQQvptlhEsbBIhI=
+github.com/DeRuina/timberjack v1.4.8/go.mod h1:DCXjOescYyzTrOryf57SEbSeCOqkBQ3QjH7Pn03i5Cs=
+github.com/chrj/smtpd v1.0.1 h1:HmC5/iGdI27q4JJn58uaANAOUE+QC7ZYZnDlQWJEph4=
+github.com/chrj/smtpd v1.0.1/go.mod h1:zEP61gNDlWp/jdUqBcq/ykIbgOERyRvwfMsRLl3h9gM=
 github.com/fortytw2/leaktest v1.3.0 h1:u8491cBMTQ8ft8aeV+adlcytMZylmA5nnwwkRZjI8vw=
 github.com/fortytw2/leaktest v1.3.0/go.mod h1:jDsjWgpAGjm2CA7WthBh/CdZYEPF31XHquHwclZch5g=
 github.com/fsnotify/fsnotify v1.10.1 h1:b0/UzAf9yR5rhf3RPm9gf3ehBPpf0oZKIjtpKrx59Ho=
 github.com/fsnotify/fsnotify v1.10.1/go.mod h1:TLheqan6HD6GBK6PrDWyDPBaEV8LspOxvPSjC+bVfgo=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/klauspost/compress v1.18.6 h1:2jupLlAwFm95+YDR+NwD2MEfFO9d4z4Prjl1XXDjuao=
-github.com/klauspost/compress v1.18.6/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
+github.com/klauspost/compress v1.18.7 h1:aUyZsS4kH3QTKurYhAOwAHxllVPnOthb3vPfnF1Ehjw=
+github.com/klauspost/compress v1.18.7/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/mattn/go-colorable v0.1.15 h1:+u9SLTRGnXv73cEsnsmoZBom+dMU88B2M0aDcWy0/jY=
 github.com/mattn/go-colorable v0.1.15/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
 github.com/mattn/go-isatty v0.0.22 h1:j8l17JJ9i6VGPUFUYoTUKPSgKe/83EYU2zBC7YNKMw4=
@@ -22,7 +22,7 @@ github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWD
 github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
 go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
 go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
-golang.org/x/crypto v0.55.0 h1:+KWHjbgOaAQ66dh/YlkZKHlz9ZUlq61AFirAR9ntP8M=
-golang.org/x/crypto v0.55.0/go.mod h1:uq0V9dE/fzQuJtbnL+2EhWOE63vo164FY8xqEnV9xis=
-golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/crypto v0.58.0 h1:COkYLr4k7nDI4r6QtMML2AfzeIswWHAJthLS6K/M/54=
+golang.org/x/crypto v0.58.0/go.mod h1:Xh+kl5A+M0gMiWDytH2Hhr5Z7WbNCpv/eB/EFgfSk+w=
+golang.org/x/sys v0.49.0 h1:XbzkgYJHdqh/8m2Uu0W/dQv8nktxx4BFHp1M0gROTXA=
+golang.org/x/sys v0.49.0/go.mod h1:hNLxWAXmnKAxqDtdwIYC4bM9oQPEecfsnNMuSxOs3og=

remotes.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"net"
 	"net/smtp"
 	"net/url"
 )
@@ -55,7 +56,7 @@ func ParseRemote(remoteURL string) (*Remote, error) {
 		Scheme:   u.Scheme,
 		Hostname: hostname,
 		Port:     port,
-		Addr:     fmt.Sprintf("%s:%s", hostname, port),
+		Addr:     net.JoinHostPort(hostname, port),
 	}
 
 	if u.User != nil {

remotes_test.go

@@ -107,6 +107,26 @@ func TestValidRemoteUrls(t *testing.T) {
 	}, "starttls://user:pass@email.com:8425/sender@website.com?auth=login&skipVerify")
 }
 
+func TestIPv6RemoteUrls(t *testing.T) {
+	for _, test := range []struct {
+		url, scheme, port string
+	}{
+		{"smtp://[::1]", "smtp", "25"},
+		{"smtps://[::1]", "smtps", "465"},
+		{"starttls://[::1]", "starttls", "587"},
+		{"smtp://[::1]:2525", "smtp", "2525"},
+	} {
+		t.Run(test.url, func(t *testing.T) {
+			AssertRemoteUrlEquals(t, &Remote{
+				Scheme:   test.scheme,
+				Hostname: "::1",
+				Port:     test.port,
+				Addr:     "[::1]:" + test.port,
+			}, test.url)
+		})
+	}
+}
+
 func TestMissingScheme(t *testing.T) {
 	_, err := ParseRemote("http://user:pass@email.com:8425/sender@website.com")
 	assert.NotNil(t, err, "Err must be present")

smtp_test.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"net/textproto"
+	"testing"
+	"time"
+)
+
+func TestSendMailIPv6Remote(t *testing.T) {
+	listener, err := net.Listen("tcp6", "[::1]:0")
+	if err != nil {
+		t.Skipf("IPv6 loopback unavailable: %v", err)
+	}
+	defer listener.Close()
+	if err := listener.(*net.TCPListener).SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+		t.Fatal(err)
+	}
+
+	result := make(chan error, 1)
+	go func() {
+		result <- serveTestSMTP(listener)
+	}()
+
+	remote, err := ParseRemote("smtp://" + listener.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := SendMail(remote, "sender@example.invalid", []string{"recipient@example.invalid"}, []byte("Subject: loopback test\r\n\r\nsynthetic fixture\r\n")); err != nil {
+		t.Fatal(err)
+	}
+	if err := <-result; err != nil {
+		t.Fatal(err)
+	}
+}
+
+// This sink accepts only the synthetic transaction used above, never relaying it.
+func serveTestSMTP(listener net.Listener) error {
+	conn, err := listener.Accept()
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	if err := conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
+		return err
+	}
+	text := textproto.NewConn(conn)
+	if err := text.PrintfLine("220 loopback test"); err != nil {
+		return err
+	}
+	commands := []struct{ command, response string }{
+		{"EHLO " + *hostName, "250 loopback test"},
+		{"MAIL FROM:<sender@example.invalid>", "250 OK"},
+		{"RCPT TO:<recipient@example.invalid>", "250 OK"},
+		{"DATA", "354 End with a dot"},
+	}
+	for _, step := range commands {
+		line, err := text.ReadLine()
+		if err != nil {
+			return err
+		}
+		if line != step.command {
+			return fmt.Errorf("command = %q, want %q", line, step.command)
+		}
+		if err := text.PrintfLine("%s", step.response); err != nil {
+			return err
+		}
+	}
+	data, err := text.ReadDotBytes()
+	if err != nil {
+		return err
+	}
+	if string(data) != "Subject: loopback test\n\nsynthetic fixture\n" {
+		return fmt.Errorf("unexpected DATA: %q", data)
+	}
+	if err := text.PrintfLine("250 OK"); err != nil {
+		return err
+	}
+	line, err := text.ReadLine()
+	if err != nil {
+		return err
+	}
+	if line != "QUIT" {
+		return fmt.Errorf("command = %q, want QUIT", line)
+	}
+	return text.PrintfLine("221 Bye")
+}