| 1 | /* $Id: cidr.cpp 82968 2020-02-04 10:35:17Z 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) 2006-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/cidr.h>
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| 32 | #include "internal/iprt.h"
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/ctype.h>
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| 36 | #include <iprt/errcore.h>
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| 37 | #include <iprt/string.h>
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| 38 | #include <iprt/stream.h>
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| 39 |
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| 40 |
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| 41 | RTDECL(int) RTCidrStrToIPv4(const char *pszAddress, PRTNETADDRIPV4 pNetwork, PRTNETADDRIPV4 pNetmask)
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| 42 | {
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| 43 | uint8_t cBits;
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| 44 | uint8_t addr[4];
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| 45 | uint32_t u32Netmask;
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| 46 | uint32_t u32Network;
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| 47 | const char *psz = pszAddress;
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| 48 | const char *pszNetmask;
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| 49 | char *pszNext;
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| 50 | int rc = VINF_SUCCESS;
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| 51 | int cDelimiter = 0;
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| 52 | int cDelimiterLimit = 0;
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| 53 |
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| 54 | AssertPtrReturn(pszAddress, VERR_INVALID_PARAMETER);
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| 55 | AssertPtrReturn(pNetwork, VERR_INVALID_PARAMETER);
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| 56 | AssertPtrReturn(pNetmask, VERR_INVALID_PARAMETER);
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| 57 |
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| 58 | pszNetmask = RTStrStr(psz, "/");
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| 59 | *(uint32_t *)addr = 0;
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| 60 | if (!pszNetmask)
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| 61 | cBits = 32;
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| 62 | else
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| 63 | {
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| 64 | rc = RTStrToUInt8Ex(pszNetmask + 1, &pszNext, 10, &cBits);
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| 65 | if ( RT_FAILURE(rc)
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| 66 | || cBits > 32
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| 67 | || rc != VINF_SUCCESS) /* No trailing symbols are acceptable after the digit */
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| 68 | return VERR_INVALID_PARAMETER;
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| 69 | }
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| 70 | u32Netmask = ~(uint32_t)((1<< (32 - cBits)) - 1);
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| 71 |
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| 72 | if (cBits <= 8)
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| 73 | cDelimiterLimit = 0;
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| 74 | else if (cBits <= 16)
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| 75 | cDelimiterLimit = 1;
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| 76 | else if (cBits <= 24)
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| 77 | cDelimiterLimit = 2;
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| 78 | else if (cBits <= 32)
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| 79 | cDelimiterLimit = 3;
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| 80 |
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| 81 | for (;;)
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| 82 | {
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| 83 | rc = RTStrToUInt8Ex(psz, &pszNext, 10, &addr[cDelimiter]);
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| 84 | if ( RT_FAILURE(rc)
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| 85 | || rc == VWRN_NUMBER_TOO_BIG)
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| 86 | return VERR_INVALID_PARAMETER;
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| 87 |
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| 88 | if (*pszNext == '.')
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| 89 | cDelimiter++;
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| 90 | else if ( cDelimiter >= cDelimiterLimit
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| 91 | && ( *pszNext == '\0'
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| 92 | || *pszNext == '/'))
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| 93 | break;
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| 94 | else
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| 95 | return VERR_INVALID_PARAMETER;
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| 96 |
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| 97 | if (cDelimiter > 3)
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| 98 | /* not more than four octets */
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| 99 | return VERR_INVALID_PARAMETER;
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| 100 |
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| 101 | psz = pszNext + 1;
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| 102 | }
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| 103 | u32Network = RT_MAKE_U32_FROM_U8(addr[3], addr[2], addr[1], addr[0]);
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| 104 |
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| 105 | /* Corner case: see RFC 790 page 2 and RFC 4632 page 6. */
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| 106 | if ( addr[0] == 0
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| 107 | && ( *(uint32_t *)addr != 0
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| 108 | || u32Netmask == (uint32_t)~0))
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| 109 | return VERR_INVALID_PARAMETER;
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| 110 |
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| 111 | if ((u32Network & ~u32Netmask) != 0)
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| 112 | return VERR_INVALID_PARAMETER;
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| 113 |
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| 114 | pNetmask->u = u32Netmask;
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| 115 | pNetwork->u = u32Network;
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| 116 | return VINF_SUCCESS;
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| 117 | }
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| 118 | RT_EXPORT_SYMBOL(RTCidrStrToIPv4);
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| 119 |
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