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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.coyote.http11;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import org.apache.coyote.Request;
import org.apache.tomcat.util.buf.MessageBytes;
public abstract class AbstractNioInputBuffer extends AbstractInputBuffer {
// -------------------------------------------------------------- Constants
enum HeaderParseStatus {
DONE, HAVE_MORE_HEADERS, NEED_MORE_DATA
}
enum HeaderParsePosition {
/**
* Start of a new header. A CRLF here means that there are no more
* headers. Any other character starts a header name.
*/
HEADER_START,
/**
* Reading a header name. All characters of header are HTTP_TOKEN_CHAR.
* Header name is followed by ':'. No whitespace is allowed.
* Any non-HTTP_TOKEN_CHAR (this includes any whitespace) encountered
* before ':' will result in the whole line being ignored.
*/
HEADER_NAME,
/**
* Skipping whitespace before text of header value starts, either on the
* first line of header value (just after ':') or on subsequent lines
* when it is known that subsequent line starts with SP or HT.
*/
HEADER_VALUE_START,
/**
* Reading the header value. We are inside the value. Either on the
* first line or on any subsequent line. We come into this state from
* HEADER_VALUE_START after the first non-SP/non-HT byte is encountered
* on the line.
*/
HEADER_VALUE,
/**
* Before reading a new line of a header. Once the next byte is peeked,
* the state changes without advancing our position. The state becomes
* either HEADER_VALUE_START (if that first byte is SP or HT), or
* HEADER_START (otherwise).
*/
HEADER_MULTI_LINE,
/**
* Reading all bytes until the next CRLF. The line is being ignored.
*/
HEADER_SKIPLINE
}
// ----------------------------------------------------------- Constructors
/**
* Alternate constructor.
*/
public AbstractNioInputBuffer(Request request, int headerBufferSize) {
this.request = request;
headers = request.getMimeHeaders();
this.headerBufferSize = headerBufferSize;
filterLibrary = new InputFilter[0];
activeFilters = new InputFilter[0];
lastActiveFilter = -1;
parsingHeader = true;
parsingRequestLine = true;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
headerParsePos = HeaderParsePosition.HEADER_START;
headerData.recycle();
swallowInput = true;
}
/**
* Parsing state - used for non blocking parsing so that
* when more data arrives, we can pick up where we left off.
*/
private boolean parsingRequestLine;
private int parsingRequestLinePhase = 0;
private boolean parsingRequestLineEol = false;
private int parsingRequestLineStart = 0;
private int parsingRequestLineQPos = -1;
private HeaderParsePosition headerParsePos;
/**
* Maximum allowed size of the HTTP request line plus headers plus any
* leading blank lines.
*/
protected final int headerBufferSize;
/**
* Known size of the NioChannel read buffer.
*/
protected int socketReadBufferSize;
// --------------------------------------------------------- Public Methods
/**
* Recycle the input buffer. This should be called when closing the
* connection.
*/
@Override
public void recycle() {
super.recycle();
headerParsePos = HeaderParsePosition.HEADER_START;
parsingRequestLine = true;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
headerData.recycle();
}
/**
* End processing of current HTTP request.
* Note: All bytes of the current request should have been already
* consumed. This method only resets all the pointers so that we are ready
* to parse the next HTTP request.
*/
@Override
public void nextRequest() {
super.nextRequest();
headerParsePos = HeaderParsePosition.HEADER_START;
parsingRequestLine = true;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
parsingRequestLineQPos = -1;
headerData.recycle();
}
/**
* Read the request line. This function is meant to be used during the
* HTTP request header parsing. Do NOT attempt to read the request body
* using it.
*
* @throws IOException If an exception occurs during the underlying socket
* read operations, or if the given buffer is not big enough to accommodate
* the whole line.
* @return true if data is properly fed; false if no data is available
* immediately and thread should be freed
*/
@Override
public boolean parseRequestLine(boolean useAvailableDataOnly)
throws IOException {
//check state
if ( !parsingRequestLine ) return true;
//
// Skipping blank lines
//
if ( parsingRequestLinePhase < 2 ) {
byte chr = 0;
do {
// Read new bytes if needed
if (pos >= lastValid) {
if (useAvailableDataOnly) {
return false;
}
// Do a simple read with a short timeout
if (!fill(false)) {
// A read is pending, so no longer in initial state
parsingRequestLinePhase = 1;
return false;
}
}
// Set the start time once we start reading data (even if it is
// just skipping blank lines)
if (request.getStartTime() < 0) {
request.setStartTime(System.currentTimeMillis());
}
chr = buf[pos++];
} while ((chr == Constants.CR) || (chr == Constants.LF));
pos--;
parsingRequestLineStart = pos;
parsingRequestLinePhase = 2;
if (getLog().isDebugEnabled()) {
getLog().debug("Received ["
+ new String(buf, pos, lastValid - pos,
StandardCharsets.ISO_8859_1)
+ "]");
}
}
if ( parsingRequestLinePhase == 2 ) {
//
// Reading the method name
// Method name is always US-ASCII
//
boolean space = false;
while (!space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) //request line parsing
return false;
}
// Spec says no CR or LF in method name
if (buf[pos] == Constants.CR || buf[pos] == Constants.LF) {
throw new IllegalArgumentException(
sm.getString("iib.invalidmethod"));
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
space = true;
request.method().setBytes(buf, parsingRequestLineStart, pos - parsingRequestLineStart);
}
pos++;
}
parsingRequestLinePhase = 3;
}
if ( parsingRequestLinePhase == 3 ) {
// Spec says single SP but also be tolerant of multiple and/or HT
boolean space = true;
while (space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) //request line parsing
return false;
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
pos++;
} else {
space = false;
}
}
parsingRequestLineStart = pos;
parsingRequestLinePhase = 4;
}
if (parsingRequestLinePhase == 4) {
// Mark the current buffer position
int end = 0;
//
// Reading the URI
//
boolean space = false;
while (!space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) //request line parsing
return false;
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
space = true;
end = pos;
} else if ((buf[pos] == Constants.CR)
|| (buf[pos] == Constants.LF)) {
// HTTP/0.9 style request
parsingRequestLineEol = true;
space = true;
end = pos;
} else if ((buf[pos] == Constants.QUESTION)
&& (parsingRequestLineQPos == -1)) {
parsingRequestLineQPos = pos;
}
pos++;
}
if (parsingRequestLineQPos >= 0) {
request.queryString().setBytes(buf, parsingRequestLineQPos + 1,
end - parsingRequestLineQPos - 1);
request.requestURI().setBytes(buf, parsingRequestLineStart, parsingRequestLineQPos - parsingRequestLineStart);
} else {
request.requestURI().setBytes(buf, parsingRequestLineStart, end - parsingRequestLineStart);
}
parsingRequestLinePhase = 5;
}
if ( parsingRequestLinePhase == 5 ) {
// Spec says single SP but also be tolerant of multiple and/or HT
boolean space = true;
while (space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) //request line parsing
return false;
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
pos++;
} else {
space = false;
}
}
parsingRequestLineStart = pos;
parsingRequestLinePhase = 6;
// Mark the current buffer position
end = 0;
}
if (parsingRequestLinePhase == 6) {
//
// Reading the protocol
// Protocol is always US-ASCII
//
while (!parsingRequestLineEol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) //request line parsing
return false;
}
if (buf[pos] == Constants.CR) {
end = pos;
} else if (buf[pos] == Constants.LF) {
if (end == 0)
end = pos;
parsingRequestLineEol = true;
}
pos++;
}
if ( (end - parsingRequestLineStart) > 0) {
request.protocol().setBytes(buf, parsingRequestLineStart, end - parsingRequestLineStart);
} else {
request.protocol().setString("");
}
parsingRequestLine = false;
parsingRequestLinePhase = 0;
parsingRequestLineEol = false;
parsingRequestLineStart = 0;
return true;
}
throw new IllegalStateException("Invalid request line parse phase:"+parsingRequestLinePhase);
}
protected void expand(int newsize) {
if ( newsize > buf.length ) {
if (parsingHeader) {
throw new IllegalArgumentException(
sm.getString("iib.requestheadertoolarge.error"));
}
// Should not happen
getLog().warn("Expanding buffer size. Old size: " + buf.length
+ ", new size: " + newsize, new Exception());
byte[] tmp = new byte[newsize];
System.arraycopy(buf,0,tmp,0,buf.length);
buf = tmp;
}
}
/**
* Parse the HTTP headers.
*/
@Override
public boolean parseHeaders()
throws IOException {
if (!parsingHeader) {
throw new IllegalStateException(
sm.getString("iib.parseheaders.ise.error"));
}
HeaderParseStatus status = HeaderParseStatus.HAVE_MORE_HEADERS;
do {
status = parseHeader();
// Checking that
// (1) Headers plus request line size does not exceed its limit
// (2) There are enough bytes to avoid expanding the buffer when
// reading body
// Technically, (2) is technical limitation, (1) is logical
// limitation to enforce the meaning of headerBufferSize
// From the way how buf is allocated and how blank lines are being
// read, it should be enough to check (1) only.
if (pos > headerBufferSize
|| buf.length - pos < socketReadBufferSize) {
throw new IllegalArgumentException(
sm.getString("iib.requestheadertoolarge.error"));
}
} while ( status == HeaderParseStatus.HAVE_MORE_HEADERS );
if (status == HeaderParseStatus.DONE) {
parsingHeader = false;
end = pos;
return true;
} else {
return false;
}
}
/**
* Parse an HTTP header.
*
* @return false after reading a blank line (which indicates that the
* HTTP header parsing is done
*/
private HeaderParseStatus parseHeader()
throws IOException {
//
// Check for blank line
//
byte chr = 0;
while (headerParsePos == HeaderParsePosition.HEADER_START) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) {//parse header
headerParsePos = HeaderParsePosition.HEADER_START;
return HeaderParseStatus.NEED_MORE_DATA;
}
}
chr = buf[pos];
if (chr == Constants.CR) {
// Skip
} else if (chr == Constants.LF) {
pos++;
return HeaderParseStatus.DONE;
} else {
break;
}
pos++;
}
if ( headerParsePos == HeaderParsePosition.HEADER_START ) {
// Mark the current buffer position
headerData.start = pos;
headerParsePos = HeaderParsePosition.HEADER_NAME;
}
//
// Reading the header name
// Header name is always US-ASCII
//
while (headerParsePos == HeaderParsePosition.HEADER_NAME) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) { //parse header
return HeaderParseStatus.NEED_MORE_DATA;
}
}
chr = buf[pos];
if (chr == Constants.COLON) {
headerParsePos = HeaderParsePosition.HEADER_VALUE_START;
headerData.headerValue = headers.addValue(buf, headerData.start, pos - headerData.start);
pos++;
// Mark the current buffer position
headerData.start = pos;
headerData.realPos = pos;
headerData.lastSignificantChar = pos;
break;
} else if (!HTTP_TOKEN_CHAR[chr]) {
// If a non-token header is detected, skip the line and
// ignore the header
headerData.lastSignificantChar = pos;
return skipLine();
}
// chr is next byte of header name. Convert to lowercase.
if ((chr >= Constants.A) && (chr <= Constants.Z)) {
buf[pos] = (byte) (chr - Constants.LC_OFFSET);
}
pos++;
}
// Skip the line and ignore the header
if (headerParsePos == HeaderParsePosition.HEADER_SKIPLINE) {
return skipLine();
}
//
// Reading the header value (which can be spanned over multiple lines)
//
while (headerParsePos == HeaderParsePosition.HEADER_VALUE_START ||
headerParsePos == HeaderParsePosition.HEADER_VALUE ||
headerParsePos == HeaderParsePosition.HEADER_MULTI_LINE) {
if ( headerParsePos == HeaderParsePosition.HEADER_VALUE_START ) {
// Skipping spaces
while (true) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) {//parse header
//HEADER_VALUE_START
return HeaderParseStatus.NEED_MORE_DATA;
}
}
chr = buf[pos];
if (chr == Constants.SP || chr == Constants.HT) {
pos++;
} else {
headerParsePos = HeaderParsePosition.HEADER_VALUE;
break;
}
}
}
if ( headerParsePos == HeaderParsePosition.HEADER_VALUE ) {
// Reading bytes until the end of the line
boolean eol = false;
while (!eol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) {//parse header
//HEADER_VALUE
return HeaderParseStatus.NEED_MORE_DATA;
}
}
chr = buf[pos];
if (chr == Constants.CR) {
// Skip
} else if (chr == Constants.LF) {
eol = true;
} else if (chr == Constants.SP || chr == Constants.HT) {
buf[headerData.realPos] = chr;
headerData.realPos++;
} else {
buf[headerData.realPos] = chr;
headerData.realPos++;
headerData.lastSignificantChar = headerData.realPos;
}
pos++;
}
// Ignore whitespaces at the end of the line
headerData.realPos = headerData.lastSignificantChar;
// Checking the first character of the new line. If the character
// is a LWS, then it's a multiline header
headerParsePos = HeaderParsePosition.HEADER_MULTI_LINE;
}
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) {//parse header
//HEADER_MULTI_LINE
return HeaderParseStatus.NEED_MORE_DATA;
}
}
chr = buf[pos];
if ( headerParsePos == HeaderParsePosition.HEADER_MULTI_LINE ) {
if ( (chr != Constants.SP) && (chr != Constants.HT)) {
headerParsePos = HeaderParsePosition.HEADER_START;
break;
} else {
// Copying one extra space in the buffer (since there must
// be at least one space inserted between the lines)
buf[headerData.realPos] = chr;
headerData.realPos++;
headerParsePos = HeaderParsePosition.HEADER_VALUE_START;
}
}
}
// Set the header value
headerData.headerValue.setBytes(buf, headerData.start,
headerData.lastSignificantChar - headerData.start);
headerData.recycle();
return HeaderParseStatus.HAVE_MORE_HEADERS;
}
public int getParsingRequestLinePhase() {
return parsingRequestLinePhase;
}
private HeaderParseStatus skipLine() throws IOException {
headerParsePos = HeaderParsePosition.HEADER_SKIPLINE;
boolean eol = false;
// Reading bytes until the end of the line
while (!eol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill(false)) {
return HeaderParseStatus.NEED_MORE_DATA;
}
}
if (buf[pos] == Constants.CR) {
// Skip
} else if (buf[pos] == Constants.LF) {
eol = true;
} else {
headerData.lastSignificantChar = pos;
}
pos++;
}
if (getLog().isDebugEnabled()) {
getLog().debug(sm.getString("iib.invalidheader", new String(buf,
headerData.start,
headerData.lastSignificantChar - headerData.start + 1,
StandardCharsets.ISO_8859_1)));
}
headerParsePos = HeaderParsePosition.HEADER_START;
return HeaderParseStatus.HAVE_MORE_HEADERS;
}
private final HeaderParseData headerData = new HeaderParseData();
public static class HeaderParseData {
/**
* When parsing header name: first character of the header.
* When skipping broken header line: first character of the header.
* When parsing header value: first character after ':'.
*/
int start = 0;
/**
* When parsing header name: not used (stays as 0).
* When skipping broken header line: not used (stays as 0).
* When parsing header value: starts as the first character after ':'.
* Then is increased as far as more bytes of the header are harvested.
* Bytes from buf[pos] are copied to buf[realPos]. Thus the string from
* [start] to [realPos-1] is the prepared value of the header, with
* whitespaces removed as needed.
*/
int realPos = 0;
/**
* When parsing header name: not used (stays as 0).
* When skipping broken header line: last non-CR/non-LF character.
* When parsing header value: position after the last not-LWS character.
*/
int lastSignificantChar = 0;
/**
* MB that will store the value of the header. It is null while parsing
* header name and is created after the name has been parsed.
*/
MessageBytes headerValue = null;
public void recycle() {
start = 0;
realPos = 0;
lastSignificantChar = 0;
headerValue = null;
}
}
}
