mirror of
https://github.com/foxcpp/maddy.git
synced 2025-04-05 22:17:39 +03:00
89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
package target
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import (
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"context"
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"errors"
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"net"
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"strings"
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"time"
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"github.com/foxcpp/maddy/framework/address"
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"github.com/foxcpp/maddy/framework/dns"
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"github.com/foxcpp/maddy/framework/module"
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)
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func SanitizeForHeader(raw string) string {
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return strings.Replace(raw, "\n", "", -1)
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}
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func GenerateReceived(ctx context.Context, msgMeta *module.MsgMetadata, ourHostname, mailFrom string) (string, error) {
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if msgMeta.Conn == nil {
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return "", errors.New("can't generate Received for a locally generated message")
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}
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builder := strings.Builder{}
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// Empirically guessed value that should be enough to fit
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// the entire value in most cases.
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builder.Grow(256 + len(msgMeta.Conn.Hostname))
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if !msgMeta.DontTraceSender && (strings.Contains(msgMeta.Conn.Proto, "SMTP") ||
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strings.Contains(msgMeta.Conn.Proto, "LMTP")) {
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// INTERNATIONALIZATION: See RFC 6531 Section 3.7.3.
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hostname, err := dns.SelectIDNA(msgMeta.SMTPOpts.UTF8, msgMeta.Conn.Hostname)
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if err == nil {
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builder.WriteString("from ")
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builder.WriteString(hostname)
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}
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if tcpAddr, ok := msgMeta.Conn.RemoteAddr.(*net.TCPAddr); ok {
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builder.WriteString(" (")
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if msgMeta.Conn.RDNSName != nil {
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rdnsName, err := msgMeta.Conn.RDNSName.GetContext(ctx)
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if err == nil && rdnsName != nil && rdnsName.(string) != "" {
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// INTERNATIONALIZATION: See RFC 6531 Section 3.7.3.
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encoded, err := dns.SelectIDNA(msgMeta.SMTPOpts.UTF8, rdnsName.(string))
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if err == nil {
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builder.WriteString(encoded)
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builder.WriteRune(' ')
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}
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}
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}
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builder.WriteRune('[')
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builder.WriteString(tcpAddr.IP.String())
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builder.WriteString("])")
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}
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}
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if ourHostname != "" {
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ourHostname, err := dns.SelectIDNA(msgMeta.SMTPOpts.UTF8, ourHostname)
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if err == nil {
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builder.WriteString(" by ")
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builder.WriteString(SanitizeForHeader(ourHostname))
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}
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}
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if mailFrom != "" {
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// INTERNATIONALIZATION: See RFC 6531 Section 3.7.3.
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mailFrom, err := address.SelectIDNA(msgMeta.SMTPOpts.UTF8, mailFrom)
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if err == nil {
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builder.WriteString(" (envelope-sender <")
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builder.WriteString(SanitizeForHeader(mailFrom))
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builder.WriteString(">)")
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}
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}
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if msgMeta.Conn.Proto != "" {
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builder.WriteString(" with ")
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if msgMeta.SMTPOpts.UTF8 {
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builder.WriteString("UTF8")
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}
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builder.WriteString(msgMeta.Conn.Proto)
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}
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builder.WriteString(" id ")
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builder.WriteString(msgMeta.ID)
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builder.WriteString("; ")
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builder.WriteString(time.Now().Format(time.RFC1123Z))
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return strings.TrimSpace(builder.String()), nil
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}
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