crypto.go

// Copyright 2019 The Prometheus Authors
// 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 procfs

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "strconv"
    "strings"

    "github.com/Schneizelw/mtggokit/metrics/elasticsearch/procfs/internal/util"
)

// Crypto holds info parsed from /proc/crypto.
type Crypto struct {
    Alignmask   *uint64
    Async       bool
    Blocksize   *uint64
    Chunksize   *uint64
    Ctxsize     *uint64
    Digestsize  *uint64
    Driver      string
    Geniv       string
    Internal    string
    Ivsize      *uint64
    Maxauthsize *uint64
    MaxKeysize  *uint64
    MinKeysize  *uint64
    Module      string
    Name        string
    Priority    *int64
    Refcnt      *int64
    Seedsize    *uint64
    Selftest    string
    Type        string
    Walksize    *uint64
}

// Crypto parses an crypto-file (/proc/crypto) and returns a slice of
// structs containing the relevant info.  More information available here:
// https://kernel.readthedocs.io/en/sphinx-samples/crypto-API.html
func (fs FS) Crypto() ([]Crypto, error) {
    data, err := ioutil.ReadFile(fs.proc.Path("crypto"))
    if err != nil {
        return nil, fmt.Errorf("error parsing crypto %s: %s", fs.proc.Path("crypto"), err)
    }
    crypto, err := parseCrypto(data)
    if err != nil {
        return nil, fmt.Errorf("error parsing crypto %s: %s", fs.proc.Path("crypto"), err)
    }
    return crypto, nil
}

func parseCrypto(cryptoData []byte) ([]Crypto, error) {
    crypto := []Crypto{}

    cryptoBlocks := bytes.Split(cryptoData, []byte("\n\n"))

    for _, block := range cryptoBlocks {
        var newCryptoElem Crypto

        lines := strings.Split(string(block), "\n")
        for _, line := range lines {
            if strings.TrimSpace(line) == "" || line[0] == ' ' {
                continue
            }
            fields := strings.Split(line, ":")
            key := strings.TrimSpace(fields[0])
            value := strings.TrimSpace(fields[1])
            vp := util.NewValueParser(value)

            switch strings.TrimSpace(key) {
            case "async":
                b, err := strconv.ParseBool(value)
                if err == nil {
                    newCryptoElem.Async = b
                }
            case "blocksize":
                newCryptoElem.Blocksize = vp.PUInt64()
            case "chunksize":
                newCryptoElem.Chunksize = vp.PUInt64()
            case "digestsize":
                newCryptoElem.Digestsize = vp.PUInt64()
            case "driver":
                newCryptoElem.Driver = value
            case "geniv":
                newCryptoElem.Geniv = value
            case "internal":
                newCryptoElem.Internal = value
            case "ivsize":
                newCryptoElem.Ivsize = vp.PUInt64()
            case "maxauthsize":
                newCryptoElem.Maxauthsize = vp.PUInt64()
            case "max keysize":
                newCryptoElem.MaxKeysize = vp.PUInt64()
            case "min keysize":
                newCryptoElem.MinKeysize = vp.PUInt64()
            case "module":
                newCryptoElem.Module = value
            case "name":
                newCryptoElem.Name = value
            case "priority":
                newCryptoElem.Priority = vp.PInt64()
            case "refcnt":
                newCryptoElem.Refcnt = vp.PInt64()
            case "seedsize":
                newCryptoElem.Seedsize = vp.PUInt64()
            case "selftest":
                newCryptoElem.Selftest = value
            case "type":
                newCryptoElem.Type = value
            case "walksize":
                newCryptoElem.Walksize = vp.PUInt64()
            }
        }
        crypto = append(crypto, newCryptoElem)
    }
    return crypto, nil
}