mirror of https://github.com/Icinga/icinga2.git
135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
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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.h"
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#include "base/utility.h"
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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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bool NetString::ReadStringFromStream(const Stream::Ptr& stream, String *str)
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{
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/* 16 bytes are enough for the header */
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const size_t header_length = 16;
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size_t read_length;
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char *header = static_cast<char *>(malloc(header_length));
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if (header == NULL)
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BOOST_THROW_EXCEPTION(std::bad_alloc());
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read_length = 0;
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while (read_length < header_length) {
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/* Read one byte. */
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int rc = stream->Read(header + read_length, 1);
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if (rc == 0) {
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if (read_length == 0)
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return false;
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BOOST_THROW_EXCEPTION(std::runtime_error("Read() failed."));
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}
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ASSERT(rc == 1);
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read_length++;
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if (header[read_length - 1] == ':') {
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break;
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} else if (header_length == read_length) {
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free(header);
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (missing :)"));
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}
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}
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/* minimum netstring length is 3 */
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if (read_length < 3) {
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free(header);
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (short header)"));
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}
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/* no leading zeros allowed */
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if (header[0] == '0' && isdigit(header[1])) {
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free(header);
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BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid NetString (leading zero)"));
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}
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size_t len, i;
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len = 0;
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for (i = 0; i < read_length && isdigit(header[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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free(header);
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BOOST_THROW_EXCEPTION(std::invalid_argument("Length specifier must not exceed 9 characters"));
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}
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len = len * 10 + (header[i] - '0');
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}
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free(header);
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/* read the whole message */
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size_t data_length = len + 1;
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char *data = static_cast<char *>(malloc(data_length));
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if (data == NULL) {
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BOOST_THROW_EXCEPTION(std::bad_alloc());
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}
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size_t rc = stream->Read(data, data_length);
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if (rc != data_length)
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BOOST_THROW_EXCEPTION(std::runtime_error("Read() failed."));
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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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free(data);
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return true;
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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(const Stream::Ptr& stream, const String& str)
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{
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std::ostringstream msgbuf;
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msgbuf << str.GetLength() << ":" << str << ",";
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String msg = msgbuf.str();
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stream->Write(msg.CStr(), msg.GetLength());
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}
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