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https://github.com/mainflux/mainflux.git
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481b5b230d
All validation has been moved to the API resources layer, i.e. the domain objects provide validation method, but the service itself assumes no corrupted values are passed to it. Signed-off-by: Dejan Mijic <dejan@mainflux.com>
62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package icmp
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import (
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"encoding/binary"
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"net"
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"runtime"
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"golang.org/x/net/internal/socket"
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"golang.org/x/net/ipv4"
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)
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// freebsdVersion is set in sys_freebsd.go.
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// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
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var freebsdVersion uint32
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// ParseIPv4Header parses b as an IPv4 header of ICMP error message
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// invoking packet, which is contained in ICMP error message.
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func ParseIPv4Header(b []byte) (*ipv4.Header, error) {
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if len(b) < ipv4.HeaderLen {
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return nil, errHeaderTooShort
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}
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hdrlen := int(b[0]&0x0f) << 2
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if hdrlen > len(b) {
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return nil, errBufferTooShort
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}
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h := &ipv4.Header{
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Version: int(b[0] >> 4),
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Len: hdrlen,
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TOS: int(b[1]),
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ID: int(binary.BigEndian.Uint16(b[4:6])),
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FragOff: int(binary.BigEndian.Uint16(b[6:8])),
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TTL: int(b[8]),
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Protocol: int(b[9]),
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Checksum: int(binary.BigEndian.Uint16(b[10:12])),
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Src: net.IPv4(b[12], b[13], b[14], b[15]),
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Dst: net.IPv4(b[16], b[17], b[18], b[19]),
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}
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switch runtime.GOOS {
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case "darwin":
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h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
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case "freebsd":
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if freebsdVersion >= 1000000 {
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h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
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} else {
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h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
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}
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default:
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h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
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}
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h.Flags = ipv4.HeaderFlags(h.FragOff&0xe000) >> 13
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h.FragOff = h.FragOff & 0x1fff
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if hdrlen-ipv4.HeaderLen > 0 {
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h.Options = make([]byte, hdrlen-ipv4.HeaderLen)
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copy(h.Options, b[ipv4.HeaderLen:])
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}
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return h, nil
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}
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