1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
'use strict';
// This file contains process bootstrappers that can only be
// run in the main thread
const {
errnoException,
codes: {
ERR_INVALID_ARG_TYPE,
ERR_UNKNOWN_CREDENTIAL
}
} = require('internal/errors');
const {
validateMode,
validateUint32,
validateString
} = require('internal/validators');
const {
setupProcessStdio,
getMainThreadStdio
} = require('internal/process/stdio');
const assert = require('assert').strict;
function setupStdio() {
setupProcessStdio(getMainThreadStdio());
}
// Non-POSIX platforms like Windows don't have certain methods.
// Workers also lack these methods since they change process-global state.
function setupProcessMethods(_chdir, _umask) {
process.chdir = function chdir(directory) {
validateString(directory, 'directory');
return _chdir(directory);
};
process.umask = function umask(mask) {
if (mask === undefined) {
// Get the mask
return _umask(mask);
}
mask = validateMode(mask, 'mask');
return _umask(mask);
};
}
function wrapPosixCredentialSetters(credentials) {
const {
initgroups: _initgroups,
setgroups: _setgroups,
setegid: _setegid,
seteuid: _seteuid,
setgid: _setgid,
setuid: _setuid
} = credentials;
function initgroups(user, extraGroup) {
validateId(user, 'user');
validateId(extraGroup, 'extraGroup');
// Result is 0 on success, 1 if user is unknown, 2 if group is unknown.
const result = _initgroups(user, extraGroup);
if (result === 1) {
throw new ERR_UNKNOWN_CREDENTIAL('User', user);
} else if (result === 2) {
throw new ERR_UNKNOWN_CREDENTIAL('Group', extraGroup);
}
}
function setgroups(groups) {
if (!Array.isArray(groups)) {
throw new ERR_INVALID_ARG_TYPE('groups', 'Array', groups);
}
for (var i = 0; i < groups.length; i++) {
validateId(groups[i], `groups[${i}]`);
}
// Result is 0 on success. A positive integer indicates that the
// corresponding group was not found.
const result = _setgroups(groups);
if (result > 0) {
throw new ERR_UNKNOWN_CREDENTIAL('Group', groups[result - 1]);
}
}
function wrapIdSetter(type, method) {
return function(id) {
validateId(id, 'id');
// Result is 0 on success, 1 if credential is unknown.
const result = method(id);
if (result === 1) {
throw new ERR_UNKNOWN_CREDENTIAL(type, id);
}
};
}
function validateId(id, name) {
if (typeof id === 'number') {
validateUint32(id, name);
} else if (typeof id !== 'string') {
throw new ERR_INVALID_ARG_TYPE(name, ['number', 'string'], id);
}
}
return {
initgroups,
setgroups,
setegid: wrapIdSetter('Group', _setegid),
seteuid: wrapIdSetter('User', _seteuid),
setgid: wrapIdSetter('Group', _setgid),
setuid: wrapIdSetter('User', _setuid)
};
}
// Worker threads don't receive signals.
function setupSignalHandlers(internalBinding) {
const constants = internalBinding('constants').os.signals;
const signalWraps = Object.create(null);
let Signal;
function isSignal(event) {
return typeof event === 'string' && constants[event] !== undefined;
}
// Detect presence of a listener for the special signal types
process.on('newListener', function(type) {
if (isSignal(type) && signalWraps[type] === undefined) {
if (Signal === undefined)
Signal = internalBinding('signal_wrap').Signal;
const wrap = new Signal();
wrap.unref();
wrap.onsignal = process.emit.bind(process, type, type);
const signum = constants[type];
const err = wrap.start(signum);
if (err) {
wrap.close();
throw errnoException(err, 'uv_signal_start');
}
signalWraps[type] = wrap;
}
});
process.on('removeListener', function(type) {
if (signalWraps[type] !== undefined && this.listenerCount(type) === 0) {
signalWraps[type].close();
delete signalWraps[type];
}
});
// re-arm pre-existing signal event registrations
// with this signal wrap capabilities.
process.eventNames().forEach((ev) => {
if (isSignal(ev))
process.emit('newListener', ev);
});
}
function setupChildProcessIpcChannel() {
// If we were spawned with env NODE_CHANNEL_FD then load that up and
// start parsing data from that stream.
if (process.env.NODE_CHANNEL_FD) {
const fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
assert(fd >= 0);
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_CHANNEL_FD;
require('child_process')._forkChild(fd);
assert(process.send);
}
}
module.exports = {
setupStdio,
setupProcessMethods,
setupSignalHandlers,
setupChildProcessIpcChannel,
wrapPosixCredentialSetters
};
|
