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package state
import (
"bareos-zabbix-check/utils"
"bytes"
"encoding/binary"
"fmt"
"io"
"github.com/pkg/errors"
)
// c.StateFile()HeaderLength : the length of the state file header struct
const headerLength = 14 + 2 + 4 + 4 + 8 + 8 // + 19*8
// Header is a structure to hold the header of the state file. It is statically aligned for amd64 architecture
// This comes from bareos repository file core/src/lib/bsys.cc:525 and core/src/lib/bsys.cc:652
type Header struct {
ID [14]byte
_ int16
Version int32
_ int32
LastJobsAddr uint64
EndOfRecentJobResultsList uint64
//Reserved [19]uint64
}
func (sfh *Header) String() string {
return fmt.Sprintf("ID: \"%s\", Version: %d, LastJobsAddr: %d, EndOfRecentJobResultsList: %d",
string(sfh.ID[:utils.Clen(sfh.ID[:])]), sfh.Version, sfh.LastJobsAddr, sfh.EndOfRecentJobResultsList)
}
// ParseHeader parses a Header struct
func ParseHeader(handle io.Reader) (h *Header, err error) {
// Parsing the state file header
data := make([]byte, headerLength)
n, err := handle.Read(data)
if err != nil {
return nil, errors.Wrap(err, "Corrupted state file")
}
if n != headerLength {
return nil, fmt.Errorf("Corrupted state file : invalid header length")
}
buffer := bytes.NewBuffer(data)
h = &Header{}
_ = binary.Read(buffer, binary.LittleEndian, h) // this call cannot fail since we checked the header length
if id := string(h.ID[:utils.Clen(h.ID[:])]); id != "Bareos State\n" && id != "Bacula State\n" {
return nil, fmt.Errorf("Corrupted state file : Not a bareos or bacula state file : %s", id)
}
if h.Version != 4 {
return nil, fmt.Errorf("Invalid state file : This script only supports bareos state file version 4, got %d", h.Version)
}
if h.LastJobsAddr == 0 {
return nil, fmt.Errorf("No jobs exist in the state file")
}
return
}
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