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// Copyright 2018 Google LLC
//
// 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 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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