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Add echo buffer to SMTP server tests

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Refactored SMTP server tests to use an echo buffer for capturing responses. This allows for better validation of command responses without relying on error messages. Additionally, added a new test case to validate a full SendMail transaction with TLS and authentication.
This commit is contained in:
Winni Neessen 2024-11-11 13:31:25 +01:00
parent c3252626e3
commit c6da393676
Signed by: wneessen
GPG key ID: 385AC9889632126E
1 changed files with 115 additions and 59 deletions
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112
smtp/smtp_test.go
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@ -2215,9 +2215,10 @@ func TestClient_Mail(t *testing.T) {
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-8BITMIME\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoCommandAsError: "MAIL FROM:",
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
@ -2237,13 +2238,13 @@ func TestClient_Mail(t *testing.T) {
t.Errorf("failed to close client: %s", err)
}
})
if err = client.Mail("valid-from@domain.tld"); err == nil {
t.Error("server should echo the command as error but didn't")
if err = client.Mail("valid-from@domain.tld"); err != nil {
t.Errorf("failed to set mail from address: %s", err)
}
sent := strings.Replace(err.Error(), "500 ", "", -1)
expected := "MAIL FROM:<valid-from@domain.tld> BODY=8BITMIME"
if !strings.EqualFold(sent, expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, sent)
resp := strings.Split(echoBuffer.String(), "\r\n")
if !strings.EqualFold(resp[5], expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, resp[5])
}
})
t.Run("from address and server supports SMTPUTF8", func(t *testing.T) {
@ -2252,9 +2253,10 @@ func TestClient_Mail(t *testing.T) {
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-SMTPUTF8\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoCommandAsError: "MAIL FROM:",
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
@ -2274,13 +2276,13 @@ func TestClient_Mail(t *testing.T) {
t.Errorf("failed to close client: %s", err)
}
})
if err = client.Mail("valid-from@domain.tld"); err == nil {
t.Error("server should echo the command as error but didn't")
if err = client.Mail("valid-from@domain.tld"); err != nil {
t.Errorf("failed to set mail from address: %s", err)
}
sent := strings.Replace(err.Error(), "500 ", "", -1)
expected := "MAIL FROM:<valid-from@domain.tld> SMTPUTF8"
if !strings.EqualFold(sent, expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, sent)
resp := strings.Split(echoBuffer.String(), "\r\n")
if !strings.EqualFold(resp[5], expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, resp[5])
}
})
t.Run("from address and server supports DSN", func(t *testing.T) {
@ -2289,9 +2291,10 @@ func TestClient_Mail(t *testing.T) {
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-DSN\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoCommandAsError: "MAIL FROM:",
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
@ -2315,10 +2318,10 @@ func TestClient_Mail(t *testing.T) {
if err = client.Mail("valid-from@domain.tld"); err == nil {
t.Error("server should echo the command as error but didn't")
}
sent := strings.Replace(err.Error(), "500 ", "", -1)
expected := "MAIL FROM:<valid-from@domain.tld> RET=FULL"
if !strings.EqualFold(sent, expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, sent)
resp := strings.Split(echoBuffer.String(), "\r\n")
if !strings.EqualFold(resp[5], expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, resp[5])
}
})
t.Run("from address and server supports DSN, SMTPUTF8 and 8BITMIME", func(t *testing.T) {
@ -2327,9 +2330,10 @@ func TestClient_Mail(t *testing.T) {
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-DSN\r\n250-8BITMIME\r\n250-SMTPUTF8\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoCommandAsError: "MAIL FROM:",
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
@ -2353,10 +2357,10 @@ func TestClient_Mail(t *testing.T) {
if err = client.Mail("valid-from@domain.tld"); err == nil {
t.Error("server should echo the command as error but didn't")
}
sent := strings.Replace(err.Error(), "500 ", "", -1)
expected := "MAIL FROM:<valid-from@domain.tld> BODY=8BITMIME SMTPUTF8 RET=FULL"
if !strings.EqualFold(sent, expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, sent)
resp := strings.Split(echoBuffer.String(), "\r\n")
if !strings.EqualFold(resp[7], expected) {
t.Errorf("expected mail from command to be %q, but sent %q", expected, resp[7])
}
})
}
@ -2428,9 +2432,10 @@ func TestClient_Rcpt(t *testing.T) {
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-DSN\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoCommandAsError: "RCPT TO:",
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
@ -2456,10 +2461,10 @@ func TestClient_Rcpt(t *testing.T) {
if err = client.Rcpt("valid-to@domain.tld"); err == nil {
t.Error("recpient address with newlines should fail")
}
sent := strings.Replace(err.Error(), "500 ", "", -1)
expected := "RCPT TO:<valid-to@domain.tld> NOTIFY=SUCCESS"
if !strings.EqualFold(sent, expected) {
t.Errorf("expected rcpt to command to be %q, but sent %q", expected, sent)
resp := strings.Split(echoBuffer.String(), "\r\n")
if !strings.EqualFold(resp[5], expected) {
t.Errorf("expected rcpt to command to be %q, but sent %q", expected, resp[5])
}
})
}
@ -2537,6 +2542,45 @@ func TestClient_Data(t *testing.T) {
})
}
func TestSendMail(t *testing.T) {
t.Run("full SendMail transaction with TLS and auth", func(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
PortAdder.Add(1)
serverPort := int(TestServerPortBase + PortAdder.Load())
featureSet := "250-AUTH LOGIN\r\n250-DSN\r\n250 STARTTLS"
echoBuffer := bytes.NewBuffer(nil)
go func() {
if err := simpleSMTPServer(ctx, t, &serverProps{
EchoBuffer: echoBuffer,
FeatureSet: featureSet,
ListenPort: serverPort,
},
); err != nil {
t.Errorf("failed to start test server: %s", err)
return
}
}()
time.Sleep(time.Millisecond * 30)
addr := fmt.Sprintf("%s:%d", TestServerAddr, serverPort)
testHookStartTLS = func(config *tls.Config) {
testConfig := getTLSConfig(t)
config.ServerName = testConfig.ServerName
config.RootCAs = testConfig.RootCAs
config.Certificates = testConfig.Certificates
}
auth := LoginAuth("username", "password", TestServerAddr, false)
if err := SendMail(addr, auth, "valid-from@domain.tld", []string{"valid-to@domain.tld"},
[]byte("test message")); err != nil {
t.Fatalf("failed to send mail: %s", err)
}
resp := strings.Split(echoBuffer.String(), "\r\n")
for i, line := range resp {
t.Logf("response line %d: %q", i, line)
}
})
}
/*
func TestBasic(t *testing.T) {
server := strings.Join(strings.Split(basicServer, "\n"), "\r\n")
@ -4055,7 +4099,7 @@ func testingKey(s string) string { return strings.ReplaceAll(s, "TESTING KEY", "
// serverProps represents the configuration properties for the SMTP server.
type serverProps struct {
EchoCommandAsError string
EchoBuffer io.Writer
FailOnAuth bool
FailOnDataInit bool
FailOnDataClose bool
@ -4151,6 +4195,11 @@ func handleTestServerConnection(connection net.Conn, t *testing.T, props *server
if err != nil {
t.Logf("failed to write line: %s", err)
}
if props.EchoBuffer != nil {
if _, err := props.EchoBuffer.Write([]byte(data + "\r\n")); err != nil {
t.Errorf("failed write to echo buffer: %s", err)
}
}
_ = writer.Flush()
}
writeOK := func() {
@ -4171,13 +4220,15 @@ func handleTestServerConnection(connection net.Conn, t *testing.T, props *server
break
}
time.Sleep(time.Millisecond)
if props.EchoBuffer != nil {
if _, err = props.EchoBuffer.Write([]byte(data)); err != nil {
t.Errorf("failed write to echo buffer: %s", err)
}
}
var datastring string
data = strings.TrimSpace(data)
switch {
case props.EchoCommandAsError != "" && strings.HasPrefix(data, props.EchoCommandAsError):
writeLine("500 " + data)
break
case strings.HasPrefix(data, "HELO"):
if len(strings.Split(data, " ")) != 2 {
writeLine("501 Syntax: HELO hostname")
@ -4260,6 +4311,11 @@ func handleTestServerConnection(connection net.Conn, t *testing.T, props *server
t.Logf("failed to read data from connection: %s", derr)
break
}
if props.EchoBuffer != nil {
if _, err = props.EchoBuffer.Write([]byte(ddata)); err != nil {
t.Errorf("failed write to echo buffer: %s", err)
}
}
ddata = strings.TrimSpace(ddata)
if ddata == "." {
if props.FailOnDataClose {