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author | Harrison Healey <harrisonmhealey@gmail.com> | 2018-01-16 12:03:31 -0500 |
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committer | GitHub <noreply@github.com> | 2018-01-16 12:03:31 -0500 |
commit | 2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7 (patch) | |
tree | e08ff912e1924c06939f314168c3362d6f1ec0de /vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go | |
parent | f5c8a71698d0a7a16c68be220e49fe64bfee7f5c (diff) | |
download | chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.tar.gz chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.tar.bz2 chat-2fa7c464f019f67c5c0494aaf5ac0f5ecc1ee7a7.zip |
Updated dependencies and added avct/uasurfer (#8089)
* Updated dependencies and added avct/uasurfer
* Added uasurfer to NOTICE.txt
Diffstat (limited to 'vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go')
-rw-r--r-- | vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go b/vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go new file mode 100644 index 000000000..78b5b98bf --- /dev/null +++ b/vendor/github.com/miekg/dns/vendor/golang.org/x/net/icmp/interface.go @@ -0,0 +1,236 @@ +// Copyright 2015 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package icmp + +import ( + "encoding/binary" + "net" + "strings" + + "golang.org/x/net/internal/iana" +) + +const ( + classInterfaceInfo = 2 + + afiIPv4 = 1 + afiIPv6 = 2 +) + +const ( + attrMTU = 1 << iota + attrName + attrIPAddr + attrIfIndex +) + +// An InterfaceInfo represents interface and next-hop identification. +type InterfaceInfo struct { + Class int // extension object class number + Type int // extension object sub-type + Interface *net.Interface + Addr *net.IPAddr +} + +func (ifi *InterfaceInfo) nameLen() int { + if len(ifi.Interface.Name) > 63 { + return 64 + } + l := 1 + len(ifi.Interface.Name) + return (l + 3) &^ 3 +} + +func (ifi *InterfaceInfo) attrsAndLen(proto int) (attrs, l int) { + l = 4 + if ifi.Interface != nil && ifi.Interface.Index > 0 { + attrs |= attrIfIndex + l += 4 + if len(ifi.Interface.Name) > 0 { + attrs |= attrName + l += ifi.nameLen() + } + if ifi.Interface.MTU > 0 { + attrs |= attrMTU + l += 4 + } + } + if ifi.Addr != nil { + switch proto { + case iana.ProtocolICMP: + if ifi.Addr.IP.To4() != nil { + attrs |= attrIPAddr + l += 4 + net.IPv4len + } + case iana.ProtocolIPv6ICMP: + if ifi.Addr.IP.To16() != nil && ifi.Addr.IP.To4() == nil { + attrs |= attrIPAddr + l += 4 + net.IPv6len + } + } + } + return +} + +// Len implements the Len method of Extension interface. +func (ifi *InterfaceInfo) Len(proto int) int { + _, l := ifi.attrsAndLen(proto) + return l +} + +// Marshal implements the Marshal method of Extension interface. +func (ifi *InterfaceInfo) Marshal(proto int) ([]byte, error) { + attrs, l := ifi.attrsAndLen(proto) + b := make([]byte, l) + if err := ifi.marshal(proto, b, attrs, l); err != nil { + return nil, err + } + return b, nil +} + +func (ifi *InterfaceInfo) marshal(proto int, b []byte, attrs, l int) error { + binary.BigEndian.PutUint16(b[:2], uint16(l)) + b[2], b[3] = classInterfaceInfo, byte(ifi.Type) + for b = b[4:]; len(b) > 0 && attrs != 0; { + switch { + case attrs&attrIfIndex != 0: + b = ifi.marshalIfIndex(proto, b) + attrs &^= attrIfIndex + case attrs&attrIPAddr != 0: + b = ifi.marshalIPAddr(proto, b) + attrs &^= attrIPAddr + case attrs&attrName != 0: + b = ifi.marshalName(proto, b) + attrs &^= attrName + case attrs&attrMTU != 0: + b = ifi.marshalMTU(proto, b) + attrs &^= attrMTU + } + } + return nil +} + +func (ifi *InterfaceInfo) marshalIfIndex(proto int, b []byte) []byte { + binary.BigEndian.PutUint32(b[:4], uint32(ifi.Interface.Index)) + return b[4:] +} + +func (ifi *InterfaceInfo) parseIfIndex(b []byte) ([]byte, error) { + if len(b) < 4 { + return nil, errMessageTooShort + } + ifi.Interface.Index = int(binary.BigEndian.Uint32(b[:4])) + return b[4:], nil +} + +func (ifi *InterfaceInfo) marshalIPAddr(proto int, b []byte) []byte { + switch proto { + case iana.ProtocolICMP: + binary.BigEndian.PutUint16(b[:2], uint16(afiIPv4)) + copy(b[4:4+net.IPv4len], ifi.Addr.IP.To4()) + b = b[4+net.IPv4len:] + case iana.ProtocolIPv6ICMP: + binary.BigEndian.PutUint16(b[:2], uint16(afiIPv6)) + copy(b[4:4+net.IPv6len], ifi.Addr.IP.To16()) + b = b[4+net.IPv6len:] + } + return b +} + +func (ifi *InterfaceInfo) parseIPAddr(b []byte) ([]byte, error) { + if len(b) < 4 { + return nil, errMessageTooShort + } + afi := int(binary.BigEndian.Uint16(b[:2])) + b = b[4:] + switch afi { + case afiIPv4: + if len(b) < net.IPv4len { + return nil, errMessageTooShort + } + ifi.Addr.IP = make(net.IP, net.IPv4len) + copy(ifi.Addr.IP, b[:net.IPv4len]) + b = b[net.IPv4len:] + case afiIPv6: + if len(b) < net.IPv6len { + return nil, errMessageTooShort + } + ifi.Addr.IP = make(net.IP, net.IPv6len) + copy(ifi.Addr.IP, b[:net.IPv6len]) + b = b[net.IPv6len:] + } + return b, nil +} + +func (ifi *InterfaceInfo) marshalName(proto int, b []byte) []byte { + l := byte(ifi.nameLen()) + b[0] = l + copy(b[1:], []byte(ifi.Interface.Name)) + return b[l:] +} + +func (ifi *InterfaceInfo) parseName(b []byte) ([]byte, error) { + if 4 > len(b) || len(b) < int(b[0]) { + return nil, errMessageTooShort + } + l := int(b[0]) + if l%4 != 0 || 4 > l || l > 64 { + return nil, errInvalidExtension + } + var name [63]byte + copy(name[:], b[1:l]) + ifi.Interface.Name = strings.Trim(string(name[:]), "\000") + return b[l:], nil +} + +func (ifi *InterfaceInfo) marshalMTU(proto int, b []byte) []byte { + binary.BigEndian.PutUint32(b[:4], uint32(ifi.Interface.MTU)) + return b[4:] +} + +func (ifi *InterfaceInfo) parseMTU(b []byte) ([]byte, error) { + if len(b) < 4 { + return nil, errMessageTooShort + } + ifi.Interface.MTU = int(binary.BigEndian.Uint32(b[:4])) + return b[4:], nil +} + +func parseInterfaceInfo(b []byte) (Extension, error) { + ifi := &InterfaceInfo{ + Class: int(b[2]), + Type: int(b[3]), + } + if ifi.Type&(attrIfIndex|attrName|attrMTU) != 0 { + ifi.Interface = &net.Interface{} + } + if ifi.Type&attrIPAddr != 0 { + ifi.Addr = &net.IPAddr{} + } + attrs := ifi.Type & (attrIfIndex | attrIPAddr | attrName | attrMTU) + for b = b[4:]; len(b) > 0 && attrs != 0; { + var err error + switch { + case attrs&attrIfIndex != 0: + b, err = ifi.parseIfIndex(b) + attrs &^= attrIfIndex + case attrs&attrIPAddr != 0: + b, err = ifi.parseIPAddr(b) + attrs &^= attrIPAddr + case attrs&attrName != 0: + b, err = ifi.parseName(b) + attrs &^= attrName + case attrs&attrMTU != 0: + b, err = ifi.parseMTU(b) + attrs &^= attrMTU + } + if err != nil { + return nil, err + } + } + if ifi.Interface != nil && ifi.Interface.Name != "" && ifi.Addr != nil && ifi.Addr.IP.To16() != nil && ifi.Addr.IP.To4() == nil { + ifi.Addr.Zone = ifi.Interface.Name + } + return ifi, nil +} |