69 lines
1.2 KiB
Go
69 lines
1.2 KiB
Go
package smtpd
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"fmt"
|
|
"net"
|
|
"time"
|
|
)
|
|
|
|
// Envelope holds a message
|
|
type Envelope struct {
|
|
Sender string
|
|
Recipients []string
|
|
Data []byte
|
|
}
|
|
|
|
// AddReceivedLine prepends a Received header to the Data
|
|
func (env *Envelope) AddReceivedLine(peer Peer) {
|
|
|
|
tlsDetails := ""
|
|
|
|
tlsVersions := map[uint16]string{
|
|
tls.VersionSSL30: "SSL3.0",
|
|
tls.VersionTLS10: "TLS1.0",
|
|
tls.VersionTLS11: "TLS1.1",
|
|
tls.VersionTLS12: "TLS1.2",
|
|
tls.VersionTLS13: "TLS1.3",
|
|
}
|
|
|
|
if peer.TLS != nil {
|
|
version := "unknown"
|
|
|
|
if val, ok := tlsVersions[peer.TLS.Version]; ok {
|
|
version = val
|
|
}
|
|
|
|
cipher := tls.CipherSuiteName(peer.TLS.CipherSuite)
|
|
|
|
tlsDetails = fmt.Sprintf(
|
|
"\r\n\t(version=%s cipher=%s);",
|
|
version,
|
|
cipher,
|
|
)
|
|
}
|
|
|
|
peerIP := ""
|
|
if addr, ok := peer.Addr.(*net.TCPAddr); ok {
|
|
peerIP = addr.IP.String()
|
|
}
|
|
|
|
line := wrap([]byte(fmt.Sprintf(
|
|
"Received: from %s ([%s]) by %s with %s;%s\r\n\t%s\r\n",
|
|
peer.HeloName,
|
|
peerIP,
|
|
peer.ServerName,
|
|
peer.Protocol,
|
|
tlsDetails,
|
|
time.Now().Format("Mon, 02 Jan 2006 15:04:05 -0700 (MST)"),
|
|
)))
|
|
|
|
env.Data = append(env.Data, line...)
|
|
|
|
// Move the new Received line up front
|
|
|
|
copy(env.Data[len(line):], env.Data[0:len(env.Data)-len(line)])
|
|
copy(env.Data, line)
|
|
|
|
}
|