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.

6 files changed, 84 insertions, 0 deletions

diff --git a/models/dns/a.go b/models/dns/a.go
new file mode 100644
index 0000000..b3c7f38
--- /dev/null
+++ b/models/dns/a.go
@@ -0,0 +1,14 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type ARecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null;default:@" json:"name"`
+	Address  string `gorm:"not null" json:"address"`
+	Port     int    `gorm:"default:0" json:"port"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}
diff --git a/models/dns/aaaa.go b/models/dns/aaaa.go
new file mode 100644
index 0000000..0053fe0
--- /dev/null
+++ b/models/dns/aaaa.go
@@ -0,0 +1,13 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type AAAARecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null;default:@" json:"name"`
+	Address  string `gorm:"not null" json:"address"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}
diff --git a/models/dns/cname.go b/models/dns/cname.go
new file mode 100644
index 0000000..5460f82
--- /dev/null
+++ b/models/dns/cname.go
@@ -0,0 +1,13 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type CNAMERecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null" json:"name"`
+	Target   string `gorm:"not null" json:"target"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}
diff --git a/models/dns/mx.go b/models/dns/mx.go
new file mode 100644
index 0000000..1e05489
--- /dev/null
+++ b/models/dns/mx.go
@@ -0,0 +1,14 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type MXRecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null;default:@" json:"name"`
+	Target   string `gorm:"not null" json:"target"`
+	Priority uint16 `gorm:"not null;default:10" json:"priority"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}
diff --git a/models/dns/srv.go b/models/dns/srv.go
new file mode 100644
index 0000000..481ee7e
--- /dev/null
+++ b/models/dns/srv.go
@@ -0,0 +1,17 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type SRVRecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null" json:"name"`
+	Target   string `gorm:"not null" json:"target"`
+	Priority uint16 `gorm:"not null;default:0" json:"priority"`
+	Weight   uint16 `gorm:"not null;default:0" json:"weight"`
+	Port     uint16 `gorm:"not null" json:"port"`
+	Protocol string `gorm:"not null;default:tcp" json:"protocol"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}
diff --git a/models/dns/txt.go b/models/dns/txt.go
new file mode 100644
index 0000000..98342b3
--- /dev/null
+++ b/models/dns/txt.go
@@ -0,0 +1,13 @@
+package dns
+
+import (
+	"gorm.io/gorm"
+)
+
+type TXTRecord struct {
+	gorm.Model
+	DomainID uint   `gorm:"not null;index" json:"domain_id"`
+	Name     string `gorm:"not null;default:@" json:"name"`
+	Content  string `gorm:"not null" json:"content"`
+	TTL      uint32 `gorm:"not null;default:300" json:"ttl"`
+}