mirror of
https://github.com/RGBCube/serenity
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59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020, The SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "DHCPv4.h"
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//#define DHCPV4_DEBUG
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ParsedDHCPv4Options DHCPv4Packet::parse_options() const
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{
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ParsedDHCPv4Options options;
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for (size_t index = 4; index < DHCPV4_OPTION_FIELD_MAX_LENGTH; ++index) {
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auto opt_name = *(const DHCPOption*)&m_options[index];
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switch (opt_name) {
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case DHCPOption::Pad:
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continue;
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case DHCPOption::End:
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goto escape;
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default:
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++index;
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auto length = m_options[index];
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if ((size_t)length > DHCPV4_OPTION_FIELD_MAX_LENGTH - index) {
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dbg() << "Bogus option length " << length << " assuming forgotten END";
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break;
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}
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#ifdef DHCPV4_DEBUG
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dbg() << "DHCP Option " << (u8)opt_name << " with length " << length;
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#endif
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++index;
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options.options.set(opt_name, { length, &m_options[index] });
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index += length - 1;
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break;
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}
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}
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escape:;
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return options;
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}
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