Add String() method to user structures (#116)

Signed-off-by: Alessandro Boch <aboch@docker.com>

xfrm_policy.go

@@ -46,6 +46,11 @@ type XfrmPolicyTmpl struct {
 	Reqid int
 }
 
+func (t XfrmPolicyTmpl) String() string {
+	return fmt.Sprintf("{Dst: %v, Src: %v, Proto: %s, Mode: %s, Reqid: 0x%x}",
+		t.Dst, t.Src, t.Proto, t.Mode, t.Reqid)
+}
+
 // XfrmPolicy represents an ipsec policy. It represents the overlay network
 // and has a list of XfrmPolicyTmpls representing the base addresses of
 // the policy.
@@ -61,3 +66,8 @@ type XfrmPolicy struct {
 	Mark     *XfrmMark
 	Tmpls    []XfrmPolicyTmpl
 }
+
+func (p XfrmPolicy) String() string {
+	return fmt.Sprintf("{Dst: %v, Src: %v, Proto: %s, DstPort: %d, SrcPort: %d, Dir: %s, Priority: %d, Index: %d, Mark: %s, Tmpls: %s}",
+		p.Dst, p.Src, p.Proto, p.DstPort, p.SrcPort, p.Dir, p.Priority, p.Index, p.Mark, p.Tmpls)
+}

xfrm_state.go

@@ -1,6 +1,7 @@
 package netlink
 
 import (
+	"fmt"
 	"net"
 )
 
@@ -11,6 +12,10 @@ type XfrmStateAlgo struct {
 	TruncateLen int // Auth only
 }
 
+func (a XfrmStateAlgo) String() string {
+	return fmt.Sprintf("{Name: %s, Key: 0x%x, TruncateLen: %d}", a.Name, a.Key, a.TruncateLen)
+}
+
 // EncapType is an enum representing an ipsec template direction.
 type EncapType uint8
 
@@ -37,6 +42,11 @@ type XfrmStateEncap struct {
 	OriginalAddress net.IP
 }
 
+func (e XfrmStateEncap) String() string {
+	return fmt.Sprintf("{Type: %s, Srcport: %d, DstPort: %d, OriginalAddress: %v}",
+		e.Type, e.SrcPort, e.DstPort, e.OriginalAddress)
+}
+
 // XfrmState represents the state of an ipsec policy. It optionally
 // contains an XfrmStateAlgo for encryption and one for authentication.
 type XfrmState struct {
@@ -52,3 +62,8 @@ type XfrmState struct {
 	Crypt        *XfrmStateAlgo
 	Encap        *XfrmStateEncap
 }
+
+func (sa XfrmState) String() string {
+	return fmt.Sprintf("Dst: %v, Src: %v, Proto: %s, Mode: %s, SPI: 0x%x, ReqID: 0x%x, ReplayWindow: %d, Mark: %v, Auth: %v, Crypt: %v, Encap: %v",
+		sa.Dst, sa.Src, sa.Proto, sa.Mode, sa.Spi, sa.Reqid, sa.ReplayWindow, sa.Mark, sa.Auth, sa.Crypt, sa.Encap)
+}