| 1 | /* $Id: cidr.cpp 8359 2008-04-24 13:46:45Z 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) 2006-2008 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 | /*******************************************************************************
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| 32 | * Header Files *
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| 33 | *******************************************************************************/
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| 34 | #include <iprt/cidr.h>
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| 35 | #include <iprt/ctype.h>
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| 36 | #include <iprt/string.h>
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| 37 | #include <iprt/stream.h>
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| 38 |
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| 39 |
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| 40 | /**
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| 41 | * Scan a digit of an IPv4 address.
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| 42 | *
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| 43 | * @returns IPRT status code.
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| 44 | *
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| 45 | * @param iDigit The index of the IPv4 digit to scan.
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| 46 | * @param psz Pointer to the begin of the string.
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| 47 | * @param ppszNext Pointer to variable that should be set pointing to the first invalid character. (output)
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| 48 | * @param pu8 Pointer to the digit to write (output).
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| 49 | */
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| 50 | static int scanIPv4Digit(int iDigit, const char *psz, char **ppszNext, uint8_t *pu8)
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| 51 | {
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| 52 | int rc = RTStrToUInt8Ex(psz, ppszNext, 10, pu8);
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| 53 | if ( ( rc != VINF_SUCCESS
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| 54 | && rc != VWRN_TRAILING_CHARS)
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| 55 | || *pu8 > 254)
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| 56 | return VERR_INVALID_PARAMETER;
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| 57 |
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| 58 | /* first digit cannot be 0 */
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| 59 | if ( iDigit == 1
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| 60 | && *pu8 < 1)
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| 61 | return VERR_INVALID_PARAMETER;
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| 62 |
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| 63 | if (**ppszNext == '/')
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| 64 | return VINF_SUCCESS;
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| 65 |
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| 66 | if ( iDigit != 4
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| 67 | && ( **ppszNext == '\0'
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| 68 | || **ppszNext != '.'))
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| 69 | return VERR_INVALID_PARAMETER;
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| 70 |
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| 71 | return VINF_SUCCESS;
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| 72 | }
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| 73 |
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| 74 |
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| 75 | int RTCidrStrToIPv4(const char *pszAddress, PRTIPV4ADDR pNetwork, PRTIPV4ADDR pNetmask)
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| 76 | {
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| 77 | uint8_t cBits;
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| 78 | uint8_t a;
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| 79 | uint8_t b = 0;
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| 80 | uint8_t c = 0;
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| 81 | uint8_t d = 0;
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| 82 | const char *psz = pszAddress;
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| 83 | char *pszNext;
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| 84 | int rc;
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| 85 |
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| 86 | do
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| 87 | {
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| 88 | /* 1st digit */
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| 89 | rc = scanIPv4Digit(1, psz, &pszNext, &a);
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| 90 | if (RT_FAILURE(rc))
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| 91 | return rc;
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| 92 | if (*pszNext == '/')
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| 93 | break;
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| 94 | psz = pszNext + 1;
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| 95 |
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| 96 | /* 2nd digit */
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| 97 | rc = scanIPv4Digit(2, psz, &pszNext, &b);
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| 98 | if (RT_FAILURE(rc))
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| 99 | return rc;
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| 100 | if (*pszNext == '/')
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| 101 | break;
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| 102 | psz = pszNext + 1;
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| 103 |
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| 104 | /* 3rd digit */
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| 105 | rc = scanIPv4Digit(3, psz, &pszNext, &c);
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| 106 | if (RT_FAILURE(rc))
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| 107 | return rc;
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| 108 | if (*pszNext == '/')
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| 109 | break;
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| 110 | psz = pszNext + 1;
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| 111 |
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| 112 | /* 4th digit */
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| 113 | rc = scanIPv4Digit(4, psz, &pszNext, &d);
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| 114 | if (RT_FAILURE(rc))
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| 115 | return rc;
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| 116 | } while (0);
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| 117 |
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| 118 | if (*pszNext == '/')
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| 119 | {
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| 120 | psz = pszNext + 1;
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| 121 | rc = RTStrToUInt8Ex(psz, &pszNext, 10, &cBits);
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| 122 | if (rc != VINF_SUCCESS || cBits < 8 || cBits > 28)
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| 123 | return VERR_INVALID_PARAMETER;
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| 124 | }
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| 125 | else
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| 126 | cBits = 0;
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| 127 |
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| 128 | for (psz = pszNext; RT_C_IS_SPACE(*psz); psz++)
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| 129 | /* nothing */;
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| 130 | if (*psz != '\0')
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| 131 | return VERR_INVALID_PARAMETER;
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| 132 |
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| 133 | *pNetwork = RT_MAKE_U32_FROM_U8(d, c, b, a);
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| 134 | *pNetmask = ~(((uint32_t)1 << (32 - cBits)) - 1);
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| 135 | return VINF_SUCCESS;
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| 136 | }
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