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http: correctly calculate strict content length
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Fixes some logical errors related to strict content length.

Also, previously Buffer.byteLength (which is slow) was run regardless of
whether or not the len was required.

PR-URL: #46601
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
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@ronag @danielleadams
ronag authored and danielleadams committed Apr 5, 2023
1 parent 9582c8e commit 3538521
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Showing 2 changed files with 39 additions and 45 deletions.
82 changes: 38 additions & 44 deletions lib/_http_outgoing.js
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Expand Up @@ -25,7 +25,6 @@ const {
Array,
ArrayIsArray,
ArrayPrototypeJoin,
MathAbs,
MathFloor,
NumberPrototypeToString,
ObjectCreate,
Expand Down Expand Up @@ -87,7 +86,6 @@ const HIGH_WATER_MARK = getDefaultHighWaterMark();
const kCorked = Symbol('corked');
const kUniqueHeaders = Symbol('kUniqueHeaders');
const kBytesWritten = Symbol('kBytesWritten');
const kEndCalled = Symbol('kEndCalled');
const kErrored = Symbol('errored');

const nop = () => {};
Expand Down Expand Up @@ -134,7 +132,6 @@ function OutgoingMessage() {

this.strictContentLength = false;
this[kBytesWritten] = 0;
this[kEndCalled] = false;
this._contentLength = null;
this._hasBody = true;
this._trailer = '';
Expand Down Expand Up @@ -356,7 +353,7 @@ OutgoingMessage.prototype.destroy = function destroy(error) {


// This abstract either writing directly to the socket or buffering it.
OutgoingMessage.prototype._send = function _send(data, encoding, callback) {
OutgoingMessage.prototype._send = function _send(data, encoding, callback, byteLength) {
// This is a shameful hack to get the headers and first body chunk onto
// the same packet. Future versions of Node are going to take care of
// this at a lower level and in a more general way.
Expand All @@ -378,20 +375,11 @@ OutgoingMessage.prototype._send = function _send(data, encoding, callback) {
}
this._headerSent = true;
}
return this._writeRaw(data, encoding, callback);
return this._writeRaw(data, encoding, callback, byteLength);
};

function _getMessageBodySize(chunk, headers, encoding) {
if (Buffer.isBuffer(chunk)) return chunk.length;
const chunkLength = chunk ? Buffer.byteLength(chunk, encoding) : 0;
const headerLength = headers ? headers.length : 0;
if (headerLength === chunkLength) return 0;
if (headerLength < chunkLength) return MathAbs(chunkLength - headerLength);
return chunkLength;
}

OutgoingMessage.prototype._writeRaw = _writeRaw;
function _writeRaw(data, encoding, callback) {
function _writeRaw(data, encoding, callback, size) {
const conn = this.socket;
if (conn && conn.destroyed) {
// The socket was destroyed. If we're still trying to write to it,
Expand All @@ -404,25 +392,6 @@ function _writeRaw(data, encoding, callback) {
encoding = null;
}

// TODO(sidwebworks): flip the `strictContentLength` default to `true` in a future PR
if (this.strictContentLength && conn && conn.writable && !this._removedContLen && this._hasBody) {
const skip = conn._httpMessage.statusCode === 304 || (this.hasHeader('transfer-encoding') || this.chunkedEncoding);

if (typeof this._contentLength === 'number' && !skip) {
const size = _getMessageBodySize(data, conn._httpMessage._header, encoding);

if ((size + this[kBytesWritten]) > this._contentLength) {
throw new ERR_HTTP_CONTENT_LENGTH_MISMATCH(size + this[kBytesWritten], this._contentLength);
}

if (this[kEndCalled] && (size + this[kBytesWritten]) !== this._contentLength) {
throw new ERR_HTTP_CONTENT_LENGTH_MISMATCH(size + this[kBytesWritten], this._contentLength);
}

this[kBytesWritten] += size;
}
}

if (conn && conn._httpMessage === this && conn.writable) {
// There might be pending data in the this.output buffer.
if (this.outputData.length) {
Expand Down Expand Up @@ -882,18 +851,24 @@ function emitErrorNt(msg, err, callback) {
}
}

function strictContentLength(msg) {
return (
msg.strictContentLength &&
msg._contentLength != null &&
msg._hasBody &&
!msg._removedContLen &&
!msg.chunkedEncoding &&
!msg.hasHeader('transfer-encoding')
);
}

function write_(msg, chunk, encoding, callback, fromEnd) {
if (typeof callback !== 'function')
callback = nop;

let len;
if (chunk === null) {
throw new ERR_STREAM_NULL_VALUES();
} else if (typeof chunk === 'string') {
len = Buffer.byteLength(chunk, encoding);
} else if (isUint8Array(chunk)) {
len = chunk.length;
} else {
} else if (typeof chunk !== 'string' && !isUint8Array(chunk)) {
throw new ERR_INVALID_ARG_TYPE(
'chunk', ['string', 'Buffer', 'Uint8Array'], chunk);
}
Expand All @@ -914,8 +889,24 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
return false;
}

let len;

if (msg.strictContentLength) {
len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk, encoding) : chunk.byteLength;

if (
strictContentLength(msg) &&
(fromEnd ? msg[kBytesWritten] + len !== msg._contentLength : msg[kBytesWritten] + len > msg._contentLength)
) {
throw new ERR_HTTP_CONTENT_LENGTH_MISMATCH(len + msg[kBytesWritten], msg._contentLength);
}

msg[kBytesWritten] += len;
}

if (!msg._header) {
if (fromEnd) {
len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk, encoding) : chunk.byteLength;
msg._contentLength = len;
}
msg._implicitHeader();
Expand All @@ -935,12 +926,13 @@ function write_(msg, chunk, encoding, callback, fromEnd) {

let ret;
if (msg.chunkedEncoding && chunk.length !== 0) {
len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk, encoding) : chunk.byteLength;
msg._send(NumberPrototypeToString(len, 16), 'latin1', null);
msg._send(crlf_buf, null, null);
msg._send(chunk, encoding, null);
msg._send(chunk, encoding, null, len);
ret = msg._send(crlf_buf, null, callback);
} else {
ret = msg._send(chunk, encoding, callback);
ret = msg._send(chunk, encoding, callback, len);
}

debug('write ret = ' + ret);
Expand Down Expand Up @@ -1012,8 +1004,6 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
encoding = null;
}

this[kEndCalled] = true;

if (chunk) {
if (this.finished) {
onError(this,
Expand Down Expand Up @@ -1048,6 +1038,10 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
if (typeof callback === 'function')
this.once('finish', callback);

if (strictContentLength(this) && this[kBytesWritten] !== this._contentLength) {
throw new ERR_HTTP_CONTENT_LENGTH_MISMATCH(this[kBytesWritten], this._contentLength);
}

const finish = onFinish.bind(undefined, this);

if (this._hasBody && this.chunkedEncoding) {
Expand Down
2 changes: 1 addition & 1 deletion test/parallel/test-http-content-length-mismatch.js
View file
Expand Up @@ -57,7 +57,7 @@ function shouldThrowOnFewerBytes() {
res.write('a');
res.statusCode = 200;
assert.throws(() => {
res.end();
res.end('aaa');
}, {
code: 'ERR_HTTP_CONTENT_LENGTH_MISMATCH'
});
Expand Down

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