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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.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import org.apache.coyote.InputBuffer;
import org.apache.coyote.Request;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.net.AbstractEndpoint;
import org.apache.tomcat.util.net.SocketWrapper;
/**
* Implementation of InputBuffer which provides HTTP request header parsing as
* well as transfer decoding.
*
* @author Remy Maucherat
*/
public class InternalInputBuffer extends AbstractInputBuffer {
private static final Log log = LogFactory.getLog(InternalInputBuffer.class);
/**
* Underlying input stream.
*/
private InputStream inputStream;
/**
* Default constructor.
*/
public InternalInputBuffer(Request request, int headerBufferSize) {
this.request = request;
headers = request.getMimeHeaders();
buf = new byte[headerBufferSize];
inputStreamInputBuffer = new InputStreamInputBuffer();
filterLibrary = new InputFilter[0];
activeFilters = new InputFilter[0];
lastActiveFilter = -1;
parsingHeader = true;
swallowInput = true;
}
/**
* Data is always available for blocking IO (if you wait long enough) so
* return a value of 1. Note that the actual value is never used it is only
* tested for == 0 or > 0.
*/
@Override
public int available() {
return 1;
}
/**
* 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.
*/
@Override
public boolean parseRequestLine(boolean useAvailableDataOnly)
throws IOException {
int start = 0;
//
// Skipping blank lines
//
byte chr = 0;
do {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
chr = buf[pos++];
} while ((chr == Constants.CR) || (chr == Constants.LF));
pos--;
// Mark the current buffer position
start = pos;
//
// 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())
throw new EOFException(sm.getString("iib.eof.error"));
}
// 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"));
}
// Spec says single SP but it also says be tolerant of HT
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
space = true;
request.method().setBytes(buf, start, pos - start);
}
pos++;
}
// Spec says single SP but also says be tolerant of multiple and/or HT
while (space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
pos++;
} else {
space = false;
}
}
// Mark the current buffer position
start = pos;
int end = 0;
int questionPos = -1;
//
// Reading the URI
//
boolean eol = false;
while (!space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
// Spec says single SP but it also says be tolerant of HT
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
eol = true;
space = true;
end = pos;
} else if ((buf[pos] == Constants.QUESTION)
&& (questionPos == -1)) {
questionPos = pos;
}
pos++;
}
request.unparsedURI().setBytes(buf, start, end - start);
if (questionPos >= 0) {
request.queryString().setBytes(buf, questionPos + 1,
end - questionPos - 1);
request.requestURI().setBytes(buf, start, questionPos - start);
} else {
request.requestURI().setBytes(buf, start, end - start);
}
// Spec says single SP but also says be tolerant of multiple and/or HT
while (space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.SP || buf[pos] == Constants.HT) {
pos++;
} else {
space = false;
}
}
// Mark the current buffer position
start = pos;
end = 0;
//
// Reading the protocol
// Protocol is always US-ASCII
//
while (!eol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.CR) {
end = pos;
} else if (buf[pos] == Constants.LF) {
if (end == 0)
end = pos;
eol = true;
}
pos++;
}
if ((end - start) > 0) {
request.protocol().setBytes(buf, start, end - start);
} else {
request.protocol().setString("");
}
return true;
}
/**
* Parse the HTTP headers.
*/
@Override
public boolean parseHeaders()
throws IOException {
if (!parsingHeader) {
throw new IllegalStateException(
sm.getString("iib.parseheaders.ise.error"));
}
while (parseHeader()) {
// Loop until we run out of headers
}
parsingHeader = false;
end = pos;
return true;
}
/**
* Parse an HTTP header.
*
* @return false after reading a blank line (which indicates that the
* HTTP header parsing is done
*/
@SuppressWarnings("null") // headerValue cannot be null
private boolean parseHeader()
throws IOException {
//
// Check for blank line
//
byte chr = 0;
while (true) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
chr = buf[pos];
if (chr == Constants.CR) {
// Skip
} else if (chr == Constants.LF) {
pos++;
return false;
} else {
break;
}
pos++;
}
// Mark the current buffer position
int start = pos;
//
// Reading the header name
// Header name is always US-ASCII
//
boolean colon = false;
MessageBytes headerValue = null;
while (!colon) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.COLON) {
colon = true;
headerValue = headers.addValue(buf, start, pos - start);
} else if (!HTTP_TOKEN_CHAR[buf[pos]]) {
// If a non-token header is detected, skip the line and
// ignore the header
skipLine(start);
return true;
}
chr = buf[pos];
if ((chr >= Constants.A) && (chr <= Constants.Z)) {
buf[pos] = (byte) (chr - Constants.LC_OFFSET);
}
pos++;
}
// Mark the current buffer position
start = pos;
int realPos = pos;
//
// Reading the header value (which can be spanned over multiple lines)
//
boolean eol = false;
boolean validLine = true;
while (validLine) {
boolean space = true;
// Skipping spaces
while (space) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if ((buf[pos] == Constants.SP) || (buf[pos] == Constants.HT)) {
pos++;
} else {
space = false;
}
}
int lastSignificantChar = realPos;
// Reading bytes until the end of the line
while (!eol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.CR) {
// Skip
} else if (buf[pos] == Constants.LF) {
eol = true;
} else if (buf[pos] == Constants.SP) {
buf[realPos] = buf[pos];
realPos++;
} else {
buf[realPos] = buf[pos];
realPos++;
lastSignificantChar = realPos;
}
pos++;
}
realPos = lastSignificantChar;
// Checking the first character of the new line. If the character
// is a LWS, then it's a multiline header
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
chr = buf[pos];
if ((chr != Constants.SP) && (chr != Constants.HT)) {
validLine = false;
} else {
eol = false;
// Copying one extra space in the buffer (since there must
// be at least one space inserted between the lines)
buf[realPos] = chr;
realPos++;
}
}
// Set the header value
headerValue.setBytes(buf, start, realPos - start);
return true;
}
@Override
public void recycle() {
super.recycle();
inputStream = null;
}
// ------------------------------------------------------ Protected Methods
@Override
protected void init(SocketWrapper socketWrapper,
AbstractEndpoint endpoint) throws IOException {
inputStream = socketWrapper.getSocket().getInputStream();
}
private void skipLine(int start) throws IOException {
boolean eol = false;
int lastRealByte = start;
if (pos - 1 > start) {
lastRealByte = pos - 1;
}
while (!eol) {
// Read new bytes if needed
if (pos >= lastValid) {
if (!fill())
throw new EOFException(sm.getString("iib.eof.error"));
}
if (buf[pos] == Constants.CR) {
// Skip
} else if (buf[pos] == Constants.LF) {
eol = true;
} else {
lastRealByte = pos;
}
pos++;
}
if (log.isDebugEnabled()) {
log.debug(sm.getString("iib.invalidheader", new String(buf, start,
lastRealByte - start + 1, StandardCharsets.ISO_8859_1)));
}
}
/**
* Fill the internal buffer using data from the underlying input stream.
*
* @return false if at end of stream
*/
protected boolean fill() throws IOException {
return fill(true);
}
@Override
protected boolean fill(boolean block) throws IOException {
int nRead = 0;
if (parsingHeader) {
if (lastValid == buf.length) {
throw new IllegalArgumentException
(sm.getString("iib.requestheadertoolarge.error"));
}
nRead = inputStream.read(buf, pos, buf.length - lastValid);
if (nRead > 0) {
lastValid = pos + nRead;
}
} else {
if (buf.length - end < 4500) {
// In this case, the request header was really large, so we allocate a
// brand new one; the old one will get GCed when subsequent requests
// clear all references
buf = new byte[buf.length];
end = 0;
}
pos = end;
lastValid = pos;
nRead = inputStream.read(buf, pos, buf.length - lastValid);
if (nRead > 0) {
lastValid = pos + nRead;
}
}
return (nRead > 0);
}
@Override
protected final Log getLog() {
return log;
}
// ------------------------------------- InputStreamInputBuffer Inner Class
/**
* This class is an input buffer which will read its data from an input
* stream.
*/
protected class InputStreamInputBuffer
implements InputBuffer {
/**
* Read bytes into the specified chunk.
*/
@Override
public int doRead(ByteChunk chunk, Request req )
throws IOException {
if (pos >= lastValid) {
if (!fill())
return -1;
}
int length = lastValid - pos;
chunk.setBytes(buf, pos, length);
pos = lastValid;
return (length);
}
}
}
