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/*
* Copyright (c) 2017 by Farsight Security, Inc.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
package nmsg
import (
"encoding/binary"
"time"
"google.golang.org/protobuf/proto"
)
// Payload encapsulates an nmsg message in a NmsgPayload, suitable for sending to
// an Output
func Payload(m Message) (*NmsgPayload, error) {
mbytes, err := proto.Marshal(m)
if err != nil {
return nil, err
}
now := time.Now().UnixNano()
return &NmsgPayload{
Vid: proto.Uint32(m.GetVid()),
Msgtype: proto.Uint32(m.GetMsgtype()),
TimeSec: proto.Int64(now / 1000000000),
TimeNsec: proto.Uint32(uint32(now % 1000000000)),
Payload: mbytes,
}, nil
}
// SetSource sets the NmsgPayload source identifier.
func (p *NmsgPayload) SetSource(s uint32) {
p.Source = proto.Uint32(s)
}
// SetOperator sets the NmsgPayload operator identifier.
func (p *NmsgPayload) SetOperator(o uint32) {
p.Operator = proto.Uint32(o)
}
// SetGroup sets the NmsgPayload group identifier.
func (p *NmsgPayload) SetGroup(g uint32) {
p.Group = proto.Uint32(g)
}
// Message returns the message encapsulated in the NmsgPayload,
// Unmarshaled
func (p *NmsgPayload) Message() (Message, error) {
m, err := NewMessage(*p.Vid, *p.Msgtype)
if err != nil {
return nil, err
}
err = proto.Unmarshal(p.Payload, m)
if err != nil {
return nil, err
}
return m, nil
}
func (p *NmsgPayload) payloadSize() int {
var ibuf [binary.MaxVarintLen64]byte
psiz := proto.Size(p)
// tag + varint length of encoded p
psiz += 1 + binary.PutUvarint(ibuf[:], uint64(psiz))
// tag + varint CRC32
psiz += 1 + binary.MaxVarintLen32
return psiz
}
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