153 lines
3.5 KiB
Go
153 lines
3.5 KiB
Go
// Copyright 2019 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package procfs
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// Crypto holds info parsed from /proc/crypto.
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type Crypto struct {
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Alignmask *uint64
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Async bool
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Blocksize *uint64
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Chunksize *uint64
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Ctxsize *uint64
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Digestsize *uint64
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Driver string
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Geniv string
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Internal string
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Ivsize *uint64
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Maxauthsize *uint64
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MaxKeysize *uint64
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MinKeysize *uint64
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Module string
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Name string
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Priority *int64
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Refcnt *int64
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Seedsize *uint64
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Selftest string
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Type string
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Walksize *uint64
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}
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// Crypto parses an crypto-file (/proc/crypto) and returns a slice of
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// structs containing the relevant info. More information available here:
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// https://kernel.readthedocs.io/en/sphinx-samples/crypto-API.html
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func (fs FS) Crypto() ([]Crypto, error) {
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path := fs.proc.Path("crypto")
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b, err := util.ReadFileNoStat(path)
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if err != nil {
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return nil, fmt.Errorf("error reading crypto %q: %w", path, err)
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}
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crypto, err := parseCrypto(bytes.NewReader(b))
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if err != nil {
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return nil, fmt.Errorf("error parsing crypto %q: %w", path, err)
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}
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return crypto, nil
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}
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// parseCrypto parses a /proc/crypto stream into Crypto elements.
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func parseCrypto(r io.Reader) ([]Crypto, error) {
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var out []Crypto
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s := bufio.NewScanner(r)
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for s.Scan() {
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text := s.Text()
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switch {
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case strings.HasPrefix(text, "name"):
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// Each crypto element begins with its name.
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out = append(out, Crypto{})
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case text == "":
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continue
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}
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kv := strings.Split(text, ":")
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if len(kv) != 2 {
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return nil, fmt.Errorf("malformed crypto line: %q", text)
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}
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k := strings.TrimSpace(kv[0])
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v := strings.TrimSpace(kv[1])
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// Parse the key/value pair into the currently focused element.
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c := &out[len(out)-1]
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if err := c.parseKV(k, v); err != nil {
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return nil, err
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}
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return out, nil
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}
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// parseKV parses a key/value pair into the appropriate field of c.
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func (c *Crypto) parseKV(k, v string) error {
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vp := util.NewValueParser(v)
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switch k {
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case "async":
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// Interpret literal yes as true.
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c.Async = v == "yes"
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case "blocksize":
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c.Blocksize = vp.PUInt64()
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case "chunksize":
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c.Chunksize = vp.PUInt64()
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case "digestsize":
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c.Digestsize = vp.PUInt64()
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case "driver":
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c.Driver = v
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case "geniv":
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c.Geniv = v
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case "internal":
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c.Internal = v
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case "ivsize":
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c.Ivsize = vp.PUInt64()
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case "maxauthsize":
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c.Maxauthsize = vp.PUInt64()
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case "max keysize":
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c.MaxKeysize = vp.PUInt64()
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case "min keysize":
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c.MinKeysize = vp.PUInt64()
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case "module":
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c.Module = v
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case "name":
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c.Name = v
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case "priority":
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c.Priority = vp.PInt64()
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case "refcnt":
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c.Refcnt = vp.PInt64()
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case "seedsize":
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c.Seedsize = vp.PUInt64()
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case "selftest":
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c.Selftest = v
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case "type":
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c.Type = v
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case "walksize":
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c.Walksize = vp.PUInt64()
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}
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return vp.Err()
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}
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