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author | Alex Pilon <apilon@hashicorp.com> | 2019-02-22 18:24:37 -0500 |
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committer | Alex Pilon <apilon@hashicorp.com> | 2019-02-22 18:24:37 -0500 |
commit | 15c0b25d011f37e7c20aeca9eaf461f78285b8d9 (patch) | |
tree | 255c250a5c9d4801c74092d33b7337d8c14438ff /vendor/golang.org/x/sys/unix/sockcmsg_unix.go | |
parent | 07971ca38143c5faf951d152fba370ddcbe26ad5 (diff) | |
download | terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.tar.gz terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.tar.zst terraform-provider-statuscake-15c0b25d011f37e7c20aeca9eaf461f78285b8d9.zip |
deps: github.com/hashicorp/terraform@sdk-v0.11-with-go-modules
Updated via: go get github.com/hashicorp/terraform@sdk-v0.11-with-go-modules and go mod tidy
Diffstat (limited to 'vendor/golang.org/x/sys/unix/sockcmsg_unix.go')
-rw-r--r-- | vendor/golang.org/x/sys/unix/sockcmsg_unix.go | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/sockcmsg_unix.go b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go new file mode 100644 index 0000000..9dd2f32 --- /dev/null +++ b/vendor/golang.org/x/sys/unix/sockcmsg_unix.go | |||
@@ -0,0 +1,104 @@ | |||
1 | // Copyright 2011 The Go Authors. All rights reserved. | ||
2 | // Use of this source code is governed by a BSD-style | ||
3 | // license that can be found in the LICENSE file. | ||
4 | |||
5 | // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris | ||
6 | |||
7 | // Socket control messages | ||
8 | |||
9 | package unix | ||
10 | |||
11 | import "unsafe" | ||
12 | |||
13 | // Round the length of a raw sockaddr up to align it properly. | ||
14 | func cmsgAlignOf(salen int) int { | ||
15 | salign := SizeofPtr | ||
16 | // NOTE: It seems like 64-bit Darwin, DragonFly BSD and | ||
17 | // Solaris kernels still require 32-bit aligned access to | ||
18 | // network subsystem. | ||
19 | if darwin64Bit || dragonfly64Bit || solaris64Bit { | ||
20 | salign = 4 | ||
21 | } | ||
22 | return (salen + salign - 1) & ^(salign - 1) | ||
23 | } | ||
24 | |||
25 | // CmsgLen returns the value to store in the Len field of the Cmsghdr | ||
26 | // structure, taking into account any necessary alignment. | ||
27 | func CmsgLen(datalen int) int { | ||
28 | return cmsgAlignOf(SizeofCmsghdr) + datalen | ||
29 | } | ||
30 | |||
31 | // CmsgSpace returns the number of bytes an ancillary element with | ||
32 | // payload of the passed data length occupies. | ||
33 | func CmsgSpace(datalen int) int { | ||
34 | return cmsgAlignOf(SizeofCmsghdr) + cmsgAlignOf(datalen) | ||
35 | } | ||
36 | |||
37 | func cmsgData(h *Cmsghdr) unsafe.Pointer { | ||
38 | return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + uintptr(cmsgAlignOf(SizeofCmsghdr))) | ||
39 | } | ||
40 | |||
41 | // SocketControlMessage represents a socket control message. | ||
42 | type SocketControlMessage struct { | ||
43 | Header Cmsghdr | ||
44 | Data []byte | ||
45 | } | ||
46 | |||
47 | // ParseSocketControlMessage parses b as an array of socket control | ||
48 | // messages. | ||
49 | func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) { | ||
50 | var msgs []SocketControlMessage | ||
51 | i := 0 | ||
52 | for i+CmsgLen(0) <= len(b) { | ||
53 | h, dbuf, err := socketControlMessageHeaderAndData(b[i:]) | ||
54 | if err != nil { | ||
55 | return nil, err | ||
56 | } | ||
57 | m := SocketControlMessage{Header: *h, Data: dbuf} | ||
58 | msgs = append(msgs, m) | ||
59 | i += cmsgAlignOf(int(h.Len)) | ||
60 | } | ||
61 | return msgs, nil | ||
62 | } | ||
63 | |||
64 | func socketControlMessageHeaderAndData(b []byte) (*Cmsghdr, []byte, error) { | ||
65 | h := (*Cmsghdr)(unsafe.Pointer(&b[0])) | ||
66 | if h.Len < SizeofCmsghdr || uint64(h.Len) > uint64(len(b)) { | ||
67 | return nil, nil, EINVAL | ||
68 | } | ||
69 | return h, b[cmsgAlignOf(SizeofCmsghdr):h.Len], nil | ||
70 | } | ||
71 | |||
72 | // UnixRights encodes a set of open file descriptors into a socket | ||
73 | // control message for sending to another process. | ||
74 | func UnixRights(fds ...int) []byte { | ||
75 | datalen := len(fds) * 4 | ||
76 | b := make([]byte, CmsgSpace(datalen)) | ||
77 | h := (*Cmsghdr)(unsafe.Pointer(&b[0])) | ||
78 | h.Level = SOL_SOCKET | ||
79 | h.Type = SCM_RIGHTS | ||
80 | h.SetLen(CmsgLen(datalen)) | ||
81 | data := cmsgData(h) | ||
82 | for _, fd := range fds { | ||
83 | *(*int32)(data) = int32(fd) | ||
84 | data = unsafe.Pointer(uintptr(data) + 4) | ||
85 | } | ||
86 | return b | ||
87 | } | ||
88 | |||
89 | // ParseUnixRights decodes a socket control message that contains an | ||
90 | // integer array of open file descriptors from another process. | ||
91 | func ParseUnixRights(m *SocketControlMessage) ([]int, error) { | ||
92 | if m.Header.Level != SOL_SOCKET { | ||
93 | return nil, EINVAL | ||
94 | } | ||
95 | if m.Header.Type != SCM_RIGHTS { | ||
96 | return nil, EINVAL | ||
97 | } | ||
98 | fds := make([]int, len(m.Data)>>2) | ||
99 | for i, j := 0, 0; i < len(m.Data); i += 4 { | ||
100 | fds[j] = int(*(*int32)(unsafe.Pointer(&m.Data[i]))) | ||
101 | j++ | ||
102 | } | ||
103 | return fds, nil | ||
104 | } | ||