mirror of https://github.com/Icinga/icinga2.git
140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2018 Icinga Development Team (https://www.icinga.com/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "base/netstring.hpp"
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#include "base/debug.hpp"
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#include <sstream>
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using namespace icinga;
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/**
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* Reads data from a stream in netstring format.
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*
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* @param stream The stream to read from.
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* @param[out] str The String that has been read from the IOQueue.
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* @returns true if a complete String was read from the IOQueue, false otherwise.
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* @exception invalid_argument The input stream is invalid.
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* @see https://github.com/PeterScott/netstring-c/blob/master/netstring.c
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*/
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StreamReadStatus NetString::ReadStringFromStream(const Stream::Ptr& stream, String *str, StreamReadContext& context,
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bool may_wait, ssize_t maxMessageLength)
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{
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if (context.Eof)
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return StatusEof;
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if (context.MustRead) {
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if (!context.FillFromStream(stream, may_wait)) {
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context.Eof = true;
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return StatusEof;
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}
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context.MustRead = false;
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}
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size_t header_length = 0;
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for (size_t i = 0; i < context.Size; i++) {
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if (context.Buffer[i] == ':') {
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header_length = i;
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/* make sure there's a header */
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if (header_length == 0)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (no length specifier)"));
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break;
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} else if (i > 16)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (missing :)"));
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}
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if (header_length == 0) {
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context.MustRead = true;
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return StatusNeedData;
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}
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/* no leading zeros allowed */
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if (context.Buffer[0] == '0' && isdigit(context.Buffer[1]))
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (leading zero)"));
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size_t len, i;
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len = 0;
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for (i = 0; i < header_length && isdigit(context.Buffer[i]); i++) {
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/* length specifier must have at most 9 characters */
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if (i >= 9)
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BOOST_THROW_EXCEPTION(std::invalid_argument("Length specifier must not exceed 9 characters"));
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len = len * 10 + (context.Buffer[i] - '0');
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}
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/* read the whole message */
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size_t data_length = len + 1;
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if (maxMessageLength >= 0 && data_length > maxMessageLength) {
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std::stringstream errorMessage;
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errorMessage << "Max data length exceeded: " << (maxMessageLength / 1024) << " KB";
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BOOST_THROW_EXCEPTION(std::invalid_argument(errorMessage.str()));
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}
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char *data = context.Buffer + header_length + 1;
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if (context.Size < header_length + 1 + data_length) {
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context.MustRead = true;
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return StatusNeedData;
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}
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if (data[len] != ',')
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (missing ,)"));
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*str = String(&data[0], &data[len]);
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context.DropData(header_length + 1 + len + 1);
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return StatusNewItem;
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}
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/**
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* Writes data into a stream using the netstring format and returns bytes written.
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*
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* @param stream The stream.
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* @param str The String that is to be written.
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*
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* @return The amount of bytes written.
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*/
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size_t NetString::WriteStringToStream(const Stream::Ptr& stream, const String& str)
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{
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std::ostringstream msgbuf;
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WriteStringToStream(msgbuf, str);
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String msg = msgbuf.str();
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stream->Write(msg.CStr(), msg.GetLength());
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return msg.GetLength();
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}
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/**
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* Writes data into a stream using the netstring format.
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*
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* @param stream The stream.
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* @param str The String that is to be written.
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*/
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void NetString::WriteStringToStream(std::ostream& stream, const String& str)
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{
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stream << str.GetLength() << ":" << str << ",";
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}
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