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/* $Id: DhcpOptions.cpp $ */
/** @file
* DHCP server - DHCP options
*/
/*
* Copyright (C) 2017-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "DhcpOptions.h"
#include "DhcpMessage.h"
optmap_t &operator<<(optmap_t &optmap, DhcpOption *option)
{
if (option == NULL)
return optmap;
if (option->present())
optmap[option->optcode()] = std::shared_ptr<DhcpOption>(option);
else
optmap.erase(option->optcode());
return optmap;
}
optmap_t &operator<<(optmap_t &optmap, const std::shared_ptr<DhcpOption> &option)
{
if (!option)
return optmap;
if (option->present())
optmap[option->optcode()] = option;
else
optmap.erase(option->optcode());
return optmap;
}
int DhcpOption::encode(octets_t &dst) const
{
if (!m_fPresent)
return VERR_INVALID_STATE;
size_t cbOrig = dst.size();
append(dst, m_OptCode);
appendLength(dst, 0); /* placeholder */
ssize_t cbValue = encodeValue(dst);
if (cbValue < 0 || UINT8_MAX <= cbValue)
{
dst.resize(cbOrig); /* undo */
return VERR_INVALID_PARAMETER;
}
dst[cbOrig+1] = cbValue;
return VINF_SUCCESS;
}
/* static */
const octets_t *DhcpOption::findOption(const rawopts_t &aOptMap, uint8_t aOptCode)
{
rawopts_t::const_iterator it(aOptMap.find(aOptCode));
if (it == aOptMap.end())
return NULL;
return &it->second;
}
int DhcpOption::decode(const rawopts_t &map)
{
const octets_t *rawopt = DhcpOption::findOption(map, m_OptCode);
if (rawopt == NULL)
return VERR_NOT_FOUND;
int rc = decodeValue(*rawopt, rawopt->size());
if (RT_FAILURE(rc))
return VERR_INVALID_PARAMETER;
return VINF_SUCCESS;
}
int DhcpOption::decode(const DhcpClientMessage &req)
{
return decode(req.rawopts());
}
int DhcpOption::parse1(uint8_t &aValue, const char *pcszValue)
{
int rc = RTStrToUInt8Full(RTStrStripL(pcszValue), 10, &aValue);
if (rc == VERR_TRAILING_SPACES)
rc = VINF_SUCCESS;
return rc;
}
int DhcpOption::parse1(uint16_t &aValue, const char *pcszValue)
{
int rc = RTStrToUInt16Full(RTStrStripL(pcszValue), 10, &aValue);
if (rc == VERR_TRAILING_SPACES)
rc = VINF_SUCCESS;
return rc;
}
int DhcpOption::parse1(uint32_t &aValue, const char *pcszValue)
{
int rc = RTStrToUInt32Full(RTStrStripL(pcszValue), 10, &aValue);
if (rc == VERR_TRAILING_SPACES)
rc = VINF_SUCCESS;
return rc;
}
int DhcpOption::parse1(RTNETADDRIPV4 &aValue, const char *pcszValue)
{
return RTNetStrToIPv4Addr(pcszValue, &aValue);
}
int DhcpOption::parseList(std::vector<RTNETADDRIPV4> &aList, const char *pcszValue)
{
std::vector<RTNETADDRIPV4> l;
int rc;
pcszValue = RTStrStripL(pcszValue);
do {
RTNETADDRIPV4 Addr;
char *pszNext;
rc = RTNetStrToIPv4AddrEx(pcszValue, &Addr, &pszNext);
if (RT_FAILURE(rc))
return VERR_INVALID_PARAMETER;
if (rc == VWRN_TRAILING_CHARS)
{
pcszValue = RTStrStripL(pszNext);
if (pcszValue == pszNext) /* garbage after address */
return VERR_INVALID_PARAMETER;
}
l.push_back(Addr);
/*
* If we got VINF_SUCCESS or VWRN_TRAILING_SPACES then this
* was the last address and we are done.
*/
} while (rc == VWRN_TRAILING_CHARS);
aList.swap(l);
return VINF_SUCCESS;
}
/*
* XXX: See DHCPServer::encodeOption()
*/
int DhcpOption::parseHex(octets_t &aRawValue, const char *pcszValue)
{
octets_t data;
char *pszNext;
int rc;
if (pcszValue == NULL || *pcszValue == '\0')
return VERR_INVALID_PARAMETER;
while (*pcszValue != '\0')
{
if (data.size() > UINT8_MAX)
return VERR_INVALID_PARAMETER;
uint8_t u8Byte;
rc = RTStrToUInt8Ex(pcszValue, &pszNext, 16, &u8Byte);
if (!RT_SUCCESS(rc))
return rc;
if (*pszNext == ':')
++pszNext;
else if (*pszNext != '\0')
return VERR_PARSE_ERROR;
data.push_back(u8Byte);
pcszValue = pszNext;
}
aRawValue.swap(data);
return VINF_SUCCESS;
}
DhcpOption *DhcpOption::parse(uint8_t aOptCode, int aEnc, const char *pcszValue)
{
switch (aEnc)
{
case 0: /* DhcpOptEncoding_Legacy */
switch (aOptCode)
{
#define HANDLE(_OptClass) \
case _OptClass::optcode: \
return _OptClass::parse(pcszValue);
HANDLE(OptSubnetMask);
HANDLE(OptRouter);
HANDLE(OptDNS);
HANDLE(OptHostName);
HANDLE(OptDomainName);
HANDLE(OptRootPath);
HANDLE(OptLeaseTime);
HANDLE(OptRenewalTime);
HANDLE(OptRebindingTime);
#undef HANDLE
default:
return NULL;
}
break;
case 1:
return RawOption::parse(aOptCode, pcszValue);
default:
return NULL;
}
}
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