fiuh

1 files changed, 43 insertions, 0 deletions

diff --git a/internal/dns/rr_txt.go b/internal/dns/rr_txt.go
new file mode 100644
index 0000000..f225afa
--- /dev/null
+++ b/internal/dns/rr_txt.go
@@ -0,0 +1,43 @@
+package dns
+
+import "fmt"
+
+type TXT struct {
+	Txt []string
+}
+
+func (t *TXT) Type() uint16 {
+	return TypeTXT
+}
+
+func (t *TXT) Pack(p *packer) error {
+	for _, s := range t.Txt {
+		if len(s) > 255 {
+			return fmt.Errorf("dns: txt string > 255 octets")
+		}
+		p.buf = append(p.buf, byte(len(s)))
+		p.buf = append(p.buf, s...)
+	}
+	return nil
+}
+
+func (t *TXT) Unpack(u *unpacker, length uint16) error {
+	end := u.off + int(length)
+	for u.off < end {
+		if u.off >= len(u.buf) {
+			return fmt.Errorf("dns: short txt")
+		}
+		l := int(u.buf[u.off])
+		u.off++
+		if u.off+l > end {
+			return fmt.Errorf("dns: txt string overflow")
+		}
+		t.Txt = append(t.Txt, string(u.buf[u.off:u.off+l]))
+		u.off += l
+	}
+	return nil
+}
+
+func (t *TXT) String() string {
+	return fmt.Sprintf("%v", t.Txt)
+}