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.

3 files changed, 49 insertions, 1 deletions

diff --git a/services/domain/defaults.go b/services/domain/defaults.go
new file mode 100644
index 0000000..aee8c14
--- /dev/null
+++ b/services/domain/defaults.go
@@ -0,0 +1,6 @@
+package domain
+
+const (
+	DefaultAddress  = "127.0.0.1"
+	DefaultMXTarget = "mail"
+)
diff --git a/services/domain/domain.go b/services/domain/domain.go
index f320189..ff3efa5 100644
--- a/services/domain/domain.go
+++ b/services/domain/domain.go
@@ -3,7 +3,9 @@ package domain
 import (
 	"strings"
 
+	dnsModel "dove/models/dns"
 	domainModel "dove/models/domain"
+	dnsRepo "dove/repositories/dns"
 	domainRepo "dove/repositories/domain"
 	mailRepo "dove/repositories/mail"
 	"dove/utils/shortcuts"
@@ -86,9 +88,19 @@ func CreateDomain(request CreateDomainRequest) *shortcuts.Error {
 		return shortcuts.ServiceError(shortcuts.Internal, DomainCreationFailed)
 	}
 
+	seedDefaultARecord(newDomain.ID)
+
 	return nil
 }
 
+func seedDefaultARecord(domainID uint) {
+	dnsRepo.CreateARecord(&dnsModel.ARecord{
+		DomainID: domainID,
+		Name:     "@",
+		Address:  DefaultAddress,
+	})
+}
+
 func EditDomainFormData(domainID uint) (*EditDomainFormResponse, *shortcuts.Error) {
 	foundDomain := domainRepo.FindDomainByID(domainID)
 	if foundDomain == nil {
@@ -156,9 +168,20 @@ func DeleteDomain(domainID uint) *shortcuts.Error {
 		return shortcuts.ServiceError(shortcuts.Unprocessable, DomainHasMailboxes)
 	}
 
+	deleteAllDNSRecords(foundDomain.ID)
+
 	if deleteError := domainRepo.DeleteDomain(foundDomain); deleteError != nil {
 		return shortcuts.ServiceError(shortcuts.Internal, DomainDeletionFailed)
 	}
 
 	return nil
 }
+
+func deleteAllDNSRecords(domainID uint) {
+	dnsRepo.DeleteARecordsByDomainID(domainID)
+	dnsRepo.DeleteAAAARecordsByDomainID(domainID)
+	dnsRepo.DeleteCNAMERecordsByDomainID(domainID)
+	dnsRepo.DeleteMXRecordsByDomainID(domainID)
+	dnsRepo.DeleteTXTRecordsByDomainID(domainID)
+	dnsRepo.DeleteSRVRecordsByDomainID(domainID)
+}
diff --git a/services/mail/mailboxes.go b/services/mail/mailboxes.go
index d940907..3a4ee90 100644
--- a/services/mail/mailboxes.go
+++ b/services/mail/mailboxes.go
@@ -3,9 +3,11 @@ package mail
 import (
 	"strings"
 
+	dnsModel "dove/models/dns"
 	domainModel "dove/models/domain"
-	domainRepo "dove/repositories/domain"
 	mailModel "dove/models/mail"
+	dnsRepo "dove/repositories/dns"
+	domainRepo "dove/repositories/domain"
 	mailRepo "dove/repositories/mail"
 	"dove/utils/meta"
 	"dove/utils/shortcuts"
@@ -89,9 +91,26 @@ func CreateMailbox(request CreateMailboxRequest) *shortcuts.Error {
 		return shortcuts.ServiceError(shortcuts.Internal, FolderSeedFailed)
 	}
 
+	seedMXRecordForDomain(foundDomain)
+
 	return nil
 }
 
+func seedMXRecordForDomain(targetDomain *domainModel.Domain) {
+	fullDomainName := targetDomain.Name + "." + targetDomain.TLD.Name
+	existingMX := dnsRepo.FindMXRecordByTarget(targetDomain.ID, fullDomainName)
+	if existingMX != nil {
+		return
+	}
+
+	dnsRepo.CreateMXRecord(&dnsModel.MXRecord{
+		DomainID: targetDomain.ID,
+		Name:     "@",
+		Target:   fullDomainName,
+		Priority: 10,
+	})
+}
+
 func EditMailboxFormData(mailboxID uint) (*EditMailboxFormResponse, *shortcuts.Error) {
 	mailbox := mailRepo.FindMailboxByIDWithRelations(mailboxID)
 	if mailbox == nil {