1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132
133. 133
134. 134
135. 135
136. 136
137. 137
138. 138
139. 139
140. 140
141. 141
142. 142
143. 143
144. 144
145. 145
146. 146
147. 147
148. 148
149. 149
150. 150
151. 151
152. 152
153. 153

// 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 (
	"bufio"
	"bytes"
	"fmt"
	"io"
	"strings"

	"github.com/prometheus/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) {
	path := fs.proc.Path("crypto")
	b, err := util.ReadFileNoStat(path)
	if err != nil {
		return nil, fmt.Errorf("error reading crypto %q: %w", path, err)
	}

	crypto, err := parseCrypto(bytes.NewReader(b))
	if err != nil {
		return nil, fmt.Errorf("error parsing crypto %q: %w", path, err)
	}

	return crypto, nil
}

// parseCrypto parses a /proc/crypto stream into Crypto elements.
func parseCrypto(r io.Reader) ([]Crypto, error) {
	var out []Crypto

	s := bufio.NewScanner(r)
	for s.Scan() {
		text := s.Text()
		switch {
		case strings.HasPrefix(text, "name"):
			// Each crypto element begins with its name.
			out = append(out, Crypto{})
		case text == "":
			continue
		}

		kv := strings.Split(text, ":")
		if len(kv) != 2 {
			return nil, fmt.Errorf("malformed crypto line: %q", text)
		}

		k := strings.TrimSpace(kv[0])
		v := strings.TrimSpace(kv[1])

		// Parse the key/value pair into the currently focused element.
		c := &out[len(out)-1]
		if err := c.parseKV(k, v); err != nil {
			return nil, err
		}
	}

	if err := s.Err(); err != nil {
		return nil, err
	}

	return out, nil
}

// parseKV parses a key/value pair into the appropriate field of c.
func (c *Crypto) parseKV(k, v string) error {
	vp := util.NewValueParser(v)

	switch k {
	case "async":
		// Interpret literal yes as true.
		c.Async = v == "yes"
	case "blocksize":
		c.Blocksize = vp.PUInt64()
	case "chunksize":
		c.Chunksize = vp.PUInt64()
	case "digestsize":
		c.Digestsize = vp.PUInt64()
	case "driver":
		c.Driver = v
	case "geniv":
		c.Geniv = v
	case "internal":
		c.Internal = v
	case "ivsize":
		c.Ivsize = vp.PUInt64()
	case "maxauthsize":
		c.Maxauthsize = vp.PUInt64()
	case "max keysize":
		c.MaxKeysize = vp.PUInt64()
	case "min keysize":
		c.MinKeysize = vp.PUInt64()
	case "module":
		c.Module = v
	case "name":
		c.Name = v
	case "priority":
		c.Priority = vp.PInt64()
	case "refcnt":
		c.Refcnt = vp.PInt64()
	case "seedsize":
		c.Seedsize = vp.PUInt64()
	case "selftest":
		c.Selftest = v
	case "type":
		c.Type = v
	case "walksize":
		c.Walksize = vp.PUInt64()
	}

	return vp.Err()
}