Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

vendor/github.com/jackpal/go-nat-pmp/.travis.yml

@@ -0,0 +1,13 @@
+language: go
+
+go:
+  - 1.6.2
+  - tip
+
+allowed_failures:
+  - go: tip
+
+install:
+  - go get -d -v ./... && go install -race -v ./...
+
+script: go test -race -v ./...

vendor/github.com/jackpal/go-nat-pmp/LICENSE

@@ -0,0 +1,13 @@
+   Copyright 2013 John Howard Palevich
+
+   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.

vendor/github.com/jackpal/go-nat-pmp/README.md

@@ -0,0 +1,52 @@
+go-nat-pmp
+==========
+
+A Go language client for the NAT-PMP internet protocol for port mapping and discovering the external
+IP address of a firewall.
+
+NAT-PMP is supported by Apple brand routers and open source routers like Tomato and DD-WRT.
+
+See http://tools.ietf.org/html/draft-cheshire-nat-pmp-03
+
+
+[![Build Status](https://travis-ci.org/jackpal/go-nat-pmp.svg)](https://travis-ci.org/jackpal/go-nat-pmp)
+
+Get the package
+---------------
+
+    go get -u github.com/jackpal/go-nat-pmp
+
+Usage
+-----
+
+    import (
+        "github.com/jackpal/gateway"
+        natpmp "github.com/jackpal/go-nat-pmp"
+    )
+
+    gatewayIP, err = gateway.DiscoverGateway()
+    if err != nil {
+        return
+    }
+
+    client := natpmp.NewClient(gatewayIP)
+    response, err := client.GetExternalAddress()
+    if err != nil {
+        return
+    }
+    print("External IP address:", response.ExternalIPAddress)
+
+Clients
+-------
+
+This library is used in the Taipei Torrent BitTorrent client http://github.com/jackpal/Taipei-Torrent
+
+Complete documentation
+----------------------
+
+    http://godoc.org/github.com/jackpal/go-nat-pmp
+
+License
+-------
+
+This project is licensed under the Apache License 2.0.

vendor/github.com/jackpal/go-nat-pmp/natpmp.go

@@ -0,0 +1,153 @@
+package natpmp
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+// Implement the NAT-PMP protocol, typically supported by Apple routers and open source
+// routers such as DD-WRT and Tomato.
+//
+// See http://tools.ietf.org/html/draft-cheshire-nat-pmp-03
+//
+// Usage:
+//
+//    client := natpmp.NewClient(gatewayIP)
+//    response, err := client.GetExternalAddress()
+
+// The recommended mapping lifetime for AddPortMapping
+const RECOMMENDED_MAPPING_LIFETIME_SECONDS = 3600
+
+// Interface used to make remote procedure calls.
+type caller interface {
+	call(msg []byte, timeout time.Duration) (result []byte, err error)
+}
+
+// Client is a NAT-PMP protocol client.
+type Client struct {
+	caller  caller
+	timeout time.Duration
+}
+
+// Create a NAT-PMP client for the NAT-PMP server at the gateway.
+// Uses default timeout which is around 128 seconds.
+func NewClient(gateway net.IP) (nat *Client) {
+	return &Client{&network{gateway}, 0}
+}
+
+// Create a NAT-PMP client for the NAT-PMP server at the gateway, with a timeout.
+// Timeout defines the total amount of time we will keep retrying before giving up.
+func NewClientWithTimeout(gateway net.IP, timeout time.Duration) (nat *Client) {
+	return &Client{&network{gateway}, timeout}
+}
+
+// Results of the NAT-PMP GetExternalAddress operation.
+type GetExternalAddressResult struct {
+	SecondsSinceStartOfEpoc uint32
+	ExternalIPAddress       [4]byte
+}
+
+// Get the external address of the router.
+func (n *Client) GetExternalAddress() (result *GetExternalAddressResult, err error) {
+	msg := make([]byte, 2)
+	msg[0] = 0 // Version 0
+	msg[1] = 0 // OP Code 0
+	response, err := n.rpc(msg, 12)
+	if err != nil {
+		return
+	}
+	result = &GetExternalAddressResult{}
+	result.SecondsSinceStartOfEpoc = readNetworkOrderUint32(response[4:8])
+	copy(result.ExternalIPAddress[:], response[8:12])
+	return
+}
+
+// Results of the NAT-PMP AddPortMapping operation
+type AddPortMappingResult struct {
+	SecondsSinceStartOfEpoc      uint32
+	InternalPort                 uint16
+	MappedExternalPort           uint16
+	PortMappingLifetimeInSeconds uint32
+}
+
+// Add (or delete) a port mapping. To delete a mapping, set the requestedExternalPort and lifetime to 0
+func (n *Client) AddPortMapping(protocol string, internalPort, requestedExternalPort int, lifetime int) (result *AddPortMappingResult, err error) {
+	var opcode byte
+	if protocol == "udp" {
+		opcode = 1
+	} else if protocol == "tcp" {
+		opcode = 2
+	} else {
+		err = fmt.Errorf("unknown protocol %v", protocol)
+		return
+	}
+	msg := make([]byte, 12)
+	msg[0] = 0 // Version 0
+	msg[1] = opcode
+	writeNetworkOrderUint16(msg[4:6], uint16(internalPort))
+	writeNetworkOrderUint16(msg[6:8], uint16(requestedExternalPort))
+	writeNetworkOrderUint32(msg[8:12], uint32(lifetime))
+	response, err := n.rpc(msg, 16)
+	if err != nil {
+		return
+	}
+	result = &AddPortMappingResult{}
+	result.SecondsSinceStartOfEpoc = readNetworkOrderUint32(response[4:8])
+	result.InternalPort = readNetworkOrderUint16(response[8:10])
+	result.MappedExternalPort = readNetworkOrderUint16(response[10:12])
+	result.PortMappingLifetimeInSeconds = readNetworkOrderUint32(response[12:16])
+	return
+}
+
+func (n *Client) rpc(msg []byte, resultSize int) (result []byte, err error) {
+	result, err = n.caller.call(msg, n.timeout)
+	if err != nil {
+		return
+	}
+	err = protocolChecks(msg, resultSize, result)
+	return
+}
+
+func protocolChecks(msg []byte, resultSize int, result []byte) (err error) {
+	if len(result) != resultSize {
+		err = fmt.Errorf("unexpected result size %d, expected %d", len(result), resultSize)
+		return
+	}
+	if result[0] != 0 {
+		err = fmt.Errorf("unknown protocol version %d", result[0])
+		return
+	}
+	expectedOp := msg[1] | 0x80
+	if result[1] != expectedOp {
+		err = fmt.Errorf("Unexpected opcode %d. Expected %d", result[1], expectedOp)
+		return
+	}
+	resultCode := readNetworkOrderUint16(result[2:4])
+	if resultCode != 0 {
+		err = fmt.Errorf("Non-zero result code %d", resultCode)
+		return
+	}
+	// If we got here the RPC is good.
+	return
+}
+
+func writeNetworkOrderUint16(buf []byte, d uint16) {
+	buf[0] = byte(d >> 8)
+	buf[1] = byte(d)
+}
+
+func writeNetworkOrderUint32(buf []byte, d uint32) {
+	buf[0] = byte(d >> 24)
+	buf[1] = byte(d >> 16)
+	buf[2] = byte(d >> 8)
+	buf[3] = byte(d)
+}
+
+func readNetworkOrderUint16(buf []byte) uint16 {
+	return (uint16(buf[0]) << 8) | uint16(buf[1])
+}
+
+func readNetworkOrderUint32(buf []byte) uint32 {
+	return (uint32(buf[0]) << 24) | (uint32(buf[1]) << 16) | (uint32(buf[2]) << 8) | uint32(buf[3])
+}

vendor/github.com/jackpal/go-nat-pmp/network.go

@@ -0,0 +1,89 @@
+package natpmp
+
+import (
+	"fmt"
+	"net"
+	"time"
+)
+
+const nAT_PMP_PORT = 5351
+const nAT_TRIES = 9
+const nAT_INITIAL_MS = 250
+
+// A caller that implements the NAT-PMP RPC protocol.
+type network struct {
+	gateway net.IP
+}
+
+func (n *network) call(msg []byte, timeout time.Duration) (result []byte, err error) {
+	var server net.UDPAddr
+	server.IP = n.gateway
+	server.Port = nAT_PMP_PORT
+	conn, err := net.DialUDP("udp", nil, &server)
+	if err != nil {
+		return
+	}
+	defer conn.Close()
+
+	// 16 bytes is the maximum result size.
+	result = make([]byte, 16)
+
+	var finalTimeout time.Time
+	if timeout != 0 {
+		finalTimeout = time.Now().Add(timeout)
+	}
+
+	needNewDeadline := true
+
+	var tries uint
+	for tries = 0; (tries < nAT_TRIES && finalTimeout.IsZero()) || time.Now().Before(finalTimeout); {
+		if needNewDeadline {
+			nextDeadline := time.Now().Add((nAT_INITIAL_MS << tries) * time.Millisecond)
+			err = conn.SetDeadline(minTime(nextDeadline, finalTimeout))
+			if err != nil {
+				return
+			}
+			needNewDeadline = false
+		}
+		_, err = conn.Write(msg)
+		if err != nil {
+			return
+		}
+		var bytesRead int
+		var remoteAddr *net.UDPAddr
+		bytesRead, remoteAddr, err = conn.ReadFromUDP(result)
+		if err != nil {
+			if err.(net.Error).Timeout() {
+				tries++
+				needNewDeadline = true
+				continue
+			}
+			return
+		}
+		if !remoteAddr.IP.Equal(n.gateway) {
+			// Ignore this packet.
+			// Continue without increasing retransmission timeout or deadline.
+			continue
+		}
+		// Trim result to actual number of bytes received
+		if bytesRead < len(result) {
+			result = result[:bytesRead]
+		}
+		return
+	}
+	err = fmt.Errorf("Timed out trying to contact gateway")
+	return
+}
+
+func minTime(a, b time.Time) time.Time {
+	if a.IsZero() {
+		return b
+	}
+	if b.IsZero() {
+		return a
+	}
+	if a.Before(b) {
+		return a
+	}
+	return b
+}

vendor/github.com/jackpal/go-nat-pmp/recorder.go

@@ -0,0 +1,19 @@
+package natpmp
+
+import "time"
+
+type callObserver interface {
+	observeCall(msg []byte, result []byte, err error)
+}
+
+// A caller that records the RPC call.
+type recorder struct {
+	child    caller
+	observer callObserver
+}
+
+func (n *recorder) call(msg []byte, timeout time.Duration) (result []byte, err error) {
+	result, err = n.child.call(msg, timeout)
+	n.observer.observeCall(msg, result, err)
+	return
+}