mirror of https://github.com/Icinga/icinga2.git
129 lines
4.1 KiB
C++
129 lines
4.1 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-base.h"
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using namespace icinga;
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/**
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* Reads data from an IOQueue in netString format.
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*
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* @param queue The IOQueue 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::ReadStringFromIOQueue(IOQueue *queue, String *str)
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{
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size_t buffer_length = queue->GetAvailableBytes();
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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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/* limit the number of bytes we're reading for the header */
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if (buffer_length > 16)
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buffer_length = 16;
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char *buffer = static_cast<char *>(malloc(buffer_length));
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if (buffer == NULL && buffer_length > 0)
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throw_exception(bad_alloc());
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queue->Peek(buffer, buffer_length);
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/* no leading zeros allowed */
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if (buffer[0] == '0' && isdigit(buffer[1])) {
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free(buffer);
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throw_exception(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 < 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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free(buffer);
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throw_exception(invalid_argument("Length specifier must not exceed 9 characters"));
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}
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len = len * 10 + (buffer[i] - '0');
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}
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buffer_length = queue->GetAvailableBytes();
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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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/* limit the number of bytes we're reading to this message */
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buffer_length = i + 1 + len + 1;
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char *new_buffer = static_cast<char *>(realloc(buffer, buffer_length));
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if (new_buffer == NULL) {
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free(buffer);
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throw_exception(bad_alloc());
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}
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buffer = new_buffer;
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queue->Peek(buffer, buffer_length);
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/* check for the colon delimiter */
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if (buffer[i] != ':') {
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free(buffer);
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throw_exception(invalid_argument("Invalid NetString (missing :)"));
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}
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/* check for the comma delimiter after the String */
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if (buffer[i + 1 + len] != ',') {
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free(buffer);
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throw_exception(invalid_argument("Invalid NetString (missing ,)"));
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}
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*str = String(&buffer[i + 1], &buffer[i + 1 + len]);
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free(buffer);
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/* remove the data from the IOQueue */
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queue->Read(NULL, buffer_length);
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return true;
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}
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/**
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* Writes data into an IOQueue using the netString format.
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*
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* @param queue The IOQueue.
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* @param str The String that is to be written.
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*/
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void NetString::WriteStringToIOQueue(IOQueue *queue, const String& str)
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{
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stringstream prefixbuf;
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prefixbuf << str.GetLength() << ":";
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String prefix = prefixbuf.str();
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queue->Write(prefix.CStr(), prefix.GetLength());
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queue->Write(str.CStr(), str.GetLength());
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queue->Write(",", 1);
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}
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