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Servers: Add a new DHCP client

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This adds a DHCPClient...Server that leases IPv4s.
This commit is contained in:
AnotherTest 2020-04-04 15:49:30 +04:30 • committed by Andreas Kling
parent 77191d82dc
commit 3e8cf79efa
8 changed files with 840 additions and 1 deletions
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59
Servers/DHCPClient/DHCPv4.cpp Normal file
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/*
* Copyright (c) 2020, The SerenityOS developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "DHCPv4.h"
//#define DHCPV4_DEBUG
ParsedDHCPv4Options DHCPv4Packet::parse_options() const
{
ParsedDHCPv4Options options;
for (size_t index = 4; index < DHCPV4_OPTION_FIELD_MAX_LENGTH; ++index) {
auto opt_name = *(const DHCPOption*)&m_options[index];
switch (opt_name) {
case DHCPOption::Pad:
continue;
case DHCPOption::End:
goto escape;
default:
++index;
auto length = m_options[index];
if ((size_t)length > DHCPV4_OPTION_FIELD_MAX_LENGTH - index) {
dbg() << "Bogus option length " << length << " assuming forgotten END";
break;
}
#ifdef DHCPV4_DEBUG
dbg() << "DHCP Option " << (u8)opt_name << " with length " << length;
#endif
++index;
options.options.set(opt_name, { length, &m_options[index] });
index += length - 1;
break;
}
}
escape:;
return options;
}