Upstreaming DHCP changes from Fuchsia

PiperOrigin-RevId: 210221388
Change-Id: Ic82d592b8c4778855fa55ba913f6b9a10b2d511f

1 files changed, 115 insertions, 0 deletions

diff --git a/pkg/dhcp/dhcp_string.go b/pkg/dhcp/dhcp_string.go
new file mode 100644
index 000000000..7cabed29e
--- /dev/null
+++ b/pkg/dhcp/dhcp_string.go
@@ -0,0 +1,115 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package dhcp
+
+import (
+	"bytes"
+	"fmt"
+
+	"gvisor.googlesource.com/gvisor/pkg/tcpip"
+)
+
+func (h header) String() string {
+	opts, err := h.options()
+	var msgtype dhcpMsgType
+	if err == nil {
+		msgtype, err = opts.dhcpMsgType()
+	}
+	if !h.isValid() || err != nil {
+		return fmt.Sprintf("DHCP invalid, %v %v h[1:4]=%x cookie=%x len=%d (%v)", h.op(), h.xid(), []byte(h[1:4]), []byte(h[236:240]), len(h), err)
+	}
+	buf := new(bytes.Buffer)
+	fmt.Fprintf(buf, "%v %v len=%d\n", msgtype, h.xid(), len(h))
+	fmt.Fprintf(buf, "\tciaddr:%v yiaddr:%v siaddr:%v giaddr:%v\n",
+		tcpip.Address(h.ciaddr()),
+		tcpip.Address(h.yiaddr()),
+		tcpip.Address(h.siaddr()),
+		tcpip.Address(h.giaddr()))
+	fmt.Fprintf(buf, "\tchaddr:%x", h.chaddr())
+	for _, opt := range opts {
+		fmt.Fprintf(buf, "\n\t%v", opt)
+	}
+	return buf.String()
+}
+
+func (opt option) String() string {
+	buf := new(bytes.Buffer)
+	fmt.Fprintf(buf, "%v: ", opt.code)
+	fmt.Fprintf(buf, "%x", opt.body)
+	return buf.String()
+}
+
+func (code optionCode) String() string {
+	switch code {
+	case optSubnetMask:
+		return "option(subnet-mask)"
+	case optDefaultGateway:
+		return "option(default-gateway)"
+	case optDomainNameServer:
+		return "option(dns)"
+	case optDomainName:
+		return "option(domain-name)"
+	case optReqIPAddr:
+		return "option(request-ip-address)"
+	case optLeaseTime:
+		return "option(lease-time)"
+	case optDHCPMsgType:
+		return "option(message-type)"
+	case optDHCPServer:
+		return "option(server)"
+	case optParamReq:
+		return "option(parameter-request)"
+	case optMessage:
+		return "option(message)"
+	case optClientID:
+		return "option(client-id)"
+	default:
+		return fmt.Sprintf("option(%d)", code)
+	}
+}
+
+func (o op) String() string {
+	switch o {
+	case opRequest:
+		return "op(request)"
+	case opReply:
+		return "op(reply)"
+	}
+	return fmt.Sprintf("op(UNKNOWN:%d)", int(o))
+}
+
+func (t dhcpMsgType) String() string {
+	switch t {
+	case dhcpDISCOVER:
+		return "DHCPDISCOVER"
+	case dhcpOFFER:
+		return "DHCPOFFER"
+	case dhcpREQUEST:
+		return "DHCPREQUEST"
+	case dhcpDECLINE:
+		return "DHCPDECLINE"
+	case dhcpACK:
+		return "DHCPACK"
+	case dhcpNAK:
+		return "DHCPNAK"
+	case dhcpRELEASE:
+		return "DHCPRELEASE"
+	}
+	return fmt.Sprintf("DHCP(%d)", int(t))
+}
+
+func (v xid) String() string {
+	return fmt.Sprintf("xid:%x", uint32(v))
+}