| 1 | /* $Id: cidr.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - IPv4 address parsing.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <iprt/cidr.h>
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| 42 | #include "internal/iprt.h"
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| 43 |
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| 44 | #include <iprt/assert.h>
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| 45 | #include <iprt/ctype.h>
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| 46 | #include <iprt/errcore.h>
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| 47 | #include <iprt/string.h>
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| 48 | #include <iprt/stream.h>
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| 49 |
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| 50 |
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| 51 | RTDECL(int) RTCidrStrToIPv4(const char *pszAddress, PRTNETADDRIPV4 pNetwork, PRTNETADDRIPV4 pNetmask)
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| 52 | {
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| 53 | uint8_t cBits;
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| 54 | uint8_t addr[4];
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| 55 | uint32_t u32Netmask;
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| 56 | uint32_t u32Network;
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| 57 | const char *psz = pszAddress;
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| 58 | const char *pszNetmask;
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| 59 | char *pszNext;
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| 60 | int rc = VINF_SUCCESS;
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| 61 | int cDelimiter = 0;
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| 62 | int cDelimiterLimit = 0;
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| 63 |
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| 64 | AssertPtrReturn(pszAddress, VERR_INVALID_PARAMETER);
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| 65 | AssertPtrReturn(pNetwork, VERR_INVALID_PARAMETER);
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| 66 | AssertPtrReturn(pNetmask, VERR_INVALID_PARAMETER);
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| 67 |
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| 68 | pszNetmask = RTStrStr(psz, "/");
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| 69 | *(uint32_t *)addr = 0;
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| 70 | if (!pszNetmask)
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| 71 | cBits = 32;
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| 72 | else
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| 73 | {
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| 74 | rc = RTStrToUInt8Ex(pszNetmask + 1, &pszNext, 10, &cBits);
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| 75 | if ( RT_FAILURE(rc)
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| 76 | || cBits > 32
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| 77 | || rc != VINF_SUCCESS) /* No trailing symbols are acceptable after the digit */
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| 78 | return VERR_INVALID_PARAMETER;
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| 79 | }
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| 80 | u32Netmask = ~(uint32_t)((1<< (32 - cBits)) - 1);
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| 81 |
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| 82 | if (cBits <= 8)
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| 83 | cDelimiterLimit = 0;
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| 84 | else if (cBits <= 16)
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| 85 | cDelimiterLimit = 1;
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| 86 | else if (cBits <= 24)
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| 87 | cDelimiterLimit = 2;
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| 88 | else if (cBits <= 32)
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| 89 | cDelimiterLimit = 3;
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| 90 |
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| 91 | for (;;)
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| 92 | {
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| 93 | rc = RTStrToUInt8Ex(psz, &pszNext, 10, &addr[cDelimiter]);
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| 94 | if ( RT_FAILURE(rc)
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| 95 | || rc == VWRN_NUMBER_TOO_BIG)
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| 96 | return VERR_INVALID_PARAMETER;
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| 97 |
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| 98 | if (*pszNext == '.')
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| 99 | cDelimiter++;
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| 100 | else if ( cDelimiter >= cDelimiterLimit
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| 101 | && ( *pszNext == '\0'
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| 102 | || *pszNext == '/'))
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| 103 | break;
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| 104 | else
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| 105 | return VERR_INVALID_PARAMETER;
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| 106 |
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| 107 | if (cDelimiter > 3)
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| 108 | /* not more than four octets */
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| 109 | return VERR_INVALID_PARAMETER;
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| 110 |
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| 111 | psz = pszNext + 1;
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| 112 | }
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| 113 | u32Network = RT_MAKE_U32_FROM_U8(addr[3], addr[2], addr[1], addr[0]);
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| 114 |
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| 115 | /* Corner case: see RFC 790 page 2 and RFC 4632 page 6. */
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| 116 | if ( addr[0] == 0
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| 117 | && ( *(uint32_t *)addr != 0
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| 118 | || u32Netmask == (uint32_t)~0))
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| 119 | return VERR_INVALID_PARAMETER;
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| 120 |
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| 121 | if ((u32Network & ~u32Netmask) != 0)
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| 122 | return VERR_INVALID_PARAMETER;
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| 123 |
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| 124 | pNetmask->u = u32Netmask;
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| 125 | pNetwork->u = u32Network;
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| 126 | return VINF_SUCCESS;
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| 127 | }
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| 128 | RT_EXPORT_SYMBOL(RTCidrStrToIPv4);
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| 129 |
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