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/* $Id: cidr.cpp $ */
/** @file
* IPRT - IPv4 address parsing.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/cidr.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/ctype.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
#include <iprt/stream.h>
RTDECL(int) RTCidrStrToIPv4(const char *pszAddress, PRTNETADDRIPV4 pNetwork, PRTNETADDRIPV4 pNetmask)
{
uint8_t cBits;
uint8_t addr[4];
uint32_t u32Netmask;
uint32_t u32Network;
const char *psz = pszAddress;
const char *pszNetmask;
char *pszNext;
int rc = VINF_SUCCESS;
int cDelimiter = 0;
int cDelimiterLimit = 0;
AssertPtrReturn(pszAddress, VERR_INVALID_PARAMETER);
AssertPtrReturn(pNetwork, VERR_INVALID_PARAMETER);
AssertPtrReturn(pNetmask, VERR_INVALID_PARAMETER);
pszNetmask = RTStrStr(psz, "/");
*(uint32_t *)addr = 0;
if (!pszNetmask)
cBits = 32;
else
{
rc = RTStrToUInt8Ex(pszNetmask + 1, &pszNext, 10, &cBits);
if ( RT_FAILURE(rc)
|| cBits > 32
|| rc != VINF_SUCCESS) /* No trailing symbols are acceptable after the digit */
return VERR_INVALID_PARAMETER;
}
u32Netmask = ~(uint32_t)((1<< (32 - cBits)) - 1);
if (cBits <= 8)
cDelimiterLimit = 0;
else if (cBits <= 16)
cDelimiterLimit = 1;
else if (cBits <= 24)
cDelimiterLimit = 2;
else if (cBits <= 32)
cDelimiterLimit = 3;
for (;;)
{
rc = RTStrToUInt8Ex(psz, &pszNext, 10, &addr[cDelimiter]);
if ( RT_FAILURE(rc)
|| rc == VWRN_NUMBER_TOO_BIG)
return VERR_INVALID_PARAMETER;
if (*pszNext == '.')
cDelimiter++;
else if ( cDelimiter >= cDelimiterLimit
&& ( *pszNext == '\0'
|| *pszNext == '/'))
break;
else
return VERR_INVALID_PARAMETER;
if (cDelimiter > 3)
/* not more than four octets */
return VERR_INVALID_PARAMETER;
psz = pszNext + 1;
}
u32Network = RT_MAKE_U32_FROM_U8(addr[3], addr[2], addr[1], addr[0]);
/* Corner case: see RFC 790 page 2 and RFC 4632 page 6. */
if ( addr[0] == 0
&& ( *(uint32_t *)addr != 0
|| u32Netmask == (uint32_t)~0))
return VERR_INVALID_PARAMETER;
if ((u32Network & ~u32Netmask) != 0)
return VERR_INVALID_PARAMETER;
pNetmask->u = u32Netmask;
pNetwork->u = u32Network;
return VINF_SUCCESS;
}
RT_EXPORT_SYMBOL(RTCidrStrToIPv4);
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