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// Copyright 2016 The Netstack 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 sniffer
import "time"
type pcapHeader struct {
// MagicNumber is the file magic number.
MagicNumber uint32
// VersionMajor is the major version number.
VersionMajor uint16
// VersionMinor is the minor version number.
VersionMinor uint16
// Thiszone is the GMT to local correction.
Thiszone int32
// Sigfigs is the accuracy of timestamps.
Sigfigs uint32
// Snaplen is the max length of captured packets, in octets.
Snaplen uint32
// Network is the data link type.
Network uint32
}
const pcapPacketHeaderLen = 16
type pcapPacketHeader struct {
// Seconds is the timestamp seconds.
Seconds uint32
// Microseconds is the timestamp microseconds.
Microseconds uint32
// IncludedLength is the number of octets of packet saved in file.
IncludedLength uint32
// OriginalLength is the actual length of packet.
OriginalLength uint32
}
func newPCAPPacketHeader(incLen, orgLen uint32) pcapPacketHeader {
now := time.Now()
return pcapPacketHeader{
Seconds: uint32(now.Unix()),
Microseconds: uint32(now.Nanosecond() / 1000),
IncludedLength: incLen,
OriginalLength: orgLen,
}
}
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