mirror of https://github.com/Icinga/icinga2.git
94 lines
3.4 KiB
C++
94 lines
3.4 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 "i2-jsonrpc.h"
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using namespace icinga;
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/**
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* Reads data from a FIFO in netstring format.
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*
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* @param fifo The FIFO to read from.
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* @param[out] str The string that has been read from the FIFO.
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* @returns true if a complete string was read from the FIFO, false otherwise.
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* @exception InvalidNetstringException 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::ReadStringFromFIFO(FIFO::Ptr fifo, string *str)
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{
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size_t buffer_length = fifo->GetSize();
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char *buffer = (char *)fifo->GetReadBuffer();
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/* minimum netstring length is 3 */
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if (buffer_length < 3)
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return false;
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/* no leading zeros allowed */
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if (buffer[0] == '0' && isdigit(buffer[1]))
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throw 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 < buffer_length && isdigit(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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throw invalid_argument("Length specifier must not exceed 9 characters");
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len = len * 10 + (buffer[i] - '0');
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}
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/* make sure the buffer is large enough */
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if (i + len + 1 >= buffer_length)
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return false;
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/* check for the colon delimiter */
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if (buffer[i++] != ':')
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throw invalid_argument("Invalid Netstring (missing :)");
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/* check for the comma delimiter after the string */
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if (buffer[i + len] != ',')
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throw invalid_argument("Invalid Netstring (missing ,)");
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*str = string(&buffer[i], &buffer[i + len]);
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/* remove the data from the fifo */
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fifo->Read(NULL, i + len + 1);
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return true;
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}
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/**
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* Writes data into a FIFO using the netstring format.
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*
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* @param fifo The FIFO.
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* @param str The string that is to be written.
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*/
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void Netstring::WriteStringToFIFO(FIFO::Ptr fifo, const string& str)
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{
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stringstream prefixbuf;
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prefixbuf << str.size() << ":";
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string prefix = prefixbuf.str();
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fifo->Write(prefix.c_str(), prefix.size());
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fifo->Write(str.c_str(), str.size());
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fifo->Write(",", 1);
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}
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