feat(dns): Implement DNS record management and query handling

- Added models for various DNS record types: A, AAAA, CNAME, MX, SRV, and TXT.
- Created repository functions for CRUD operations on DNS records.
- Developed DNS server functionality to handle incoming queries and forward them to upstream servers.
- Implemented local resolution for DNS queries, including support for A, AAAA, CNAME, MX, TXT, and SRV records.
- Enhanced SMTP server to support TLS and STARTTLS configurations.
- Improved email session handling with local delivery and error logging.
- Added new log messages for better traceability of DNS operations and SMTP actions.

1 files changed, 39 insertions, 2 deletions

diff --git a/utils/smtp/server.go b/utils/smtp/server.go
index 2773647..5260d20 100644
--- a/utils/smtp/server.go
+++ b/utils/smtp/server.go
@@ -1,6 +1,7 @@
 package smtp
 
 import (
+	"crypto/tls"
 	"dove/config"
 	"dove/utils/logger"
 	"fmt"
@@ -19,10 +20,26 @@ var activeServers []ServerInstance
 func Start() {
 	plainAddress := fmt.Sprintf("%s:%d", config.SMTP.Host, config.SMTP.Port)
 	plainServer := createServer(plainAddress)
+	activeServers = append(activeServers, ServerInstance{Server: plainServer, Label: "SMTP"})
+	go startListener(plainServer, "SMTP", plainAddress)
 
-	activeServers = append(activeServers, ServerInstance{Server: plainServer, Label: LogPrefix})
+	if config.SMTP.TLSEnabled {
+		tlsConfig := loadTLSConfig()
+		if tlsConfig != nil {
+			smtpsAddress := fmt.Sprintf("%s:%d", config.SMTP.Host, config.SMTP.SMTPSPort)
+			smtpsServer := createServer(smtpsAddress)
+			smtpsServer.TLSConfig = tlsConfig
+			activeServers = append(activeServers, ServerInstance{Server: smtpsServer, Label: "SMTPS"})
+			go startTLSListener(smtpsServer, "SMTPS", smtpsAddress)
 
-	go startListener(plainServer, LogPrefix, plainAddress)
+			starttlsAddress := fmt.Sprintf("%s:%d", config.SMTP.Host, config.SMTP.StartTLSPort)
+			starttlsServer := createServer(starttlsAddress)
+			starttlsServer.TLSConfig = tlsConfig
+			starttlsServer.EnableSMTPUTF8 = true
+			activeServers = append(activeServers, ServerInstance{Server: starttlsServer, Label: "STARTTLS"})
+			go startListener(starttlsServer, "STARTTLS", starttlsAddress)
+		}
+	}
 }
 
 func Shutdown() {
@@ -51,6 +68,18 @@ func createServer(address string) *gosmtp.Server {
 	return smtpServer
 }
 
+func loadTLSConfig() *tls.Config {
+	certificate, loadError := tls.LoadX509KeyPair(config.SMTP.TLSCertPath, config.SMTP.TLSKeyPath)
+	if loadError != nil {
+		logger.Errorf(LogPrefix, TLSCertLoadFailed, loadError)
+		return nil
+	}
+
+	return &tls.Config{
+		Certificates: []tls.Certificate{certificate},
+	}
+}
+
 func startListener(smtpServer *gosmtp.Server, label string, address string) {
 	logger.Successf(LogPrefix, ServerStarting, label, address)
 
@@ -58,3 +87,11 @@ func startListener(smtpServer *gosmtp.Server, label string, address string) {
 		logger.Fatalf(LogPrefix, ListenFailed, label, listenError)
 	}
 }
+
+func startTLSListener(smtpServer *gosmtp.Server, label string, address string) {
+	logger.Successf(LogPrefix, ServerStarting, label, address)
+
+	if listenError := smtpServer.ListenAndServeTLS(); listenError != nil {
+		logger.Fatalf(LogPrefix, ListenFailed, label, listenError)
+	}
+}