Index: trunk/src/VBox/Runtime/common/misc/ip.cpp
===================================================================
--- trunk/src/VBox/Runtime/common/misc/ip.cpp	(revision 8293)
+++ trunk/src/VBox/Runtime/common/misc/ip.cpp	(revision 8293)
@@ -0,0 +1,136 @@
+/* $Id$ */
+/** @file
+ * IPRT - IPv4 address parsing.
+ */
+
+/*
+ * Copyright (C) 2006-2008 Sun Microsystems, Inc.
+ *
+ * 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.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
+ * Clara, CA 95054 USA or visit http://www.sun.com if you need
+ * additional information or have any questions.
+ */
+
+/*******************************************************************************
+*   Header Files                                                               *
+*******************************************************************************/
+#include <iprt/ip.h>
+#include <iprt/ctype.h>
+#include <iprt/string.h>
+#include <iprt/stream.h>
+
+
+/**
+ * Scan a digit of an IPv4 address.
+ *
+ * @returns IPRT status code.
+ *
+ * @param   iDigit     The index of the IPv4 digit to scan.
+ * @param   psz        Pointer to the begin of the string.
+ * @param   ppszNext   Pointer to variable that should be set pointing to the first invalid character. (output)
+ * @param   pu8        Pointer to the digit to write (output).
+ */
+static int scanIPv4Digit(int iDigit, const char *psz, char **ppszNext, uint8_t *pu8)
+{
+    int rc = RTStrToUInt8Ex(psz, ppszNext, 10, pu8);
+    if (      rc != VINF_SUCCESS
+           && rc != VWRN_TRAILING_CHARS
+        || *pu8 > 254)
+        return VERR_INVALID_PARAMETER;
+
+    /* first digit cannot be 0 */
+    if (   iDigit == 1
+        && *pu8 < 1)
+        return VERR_INVALID_PARAMETER;
+
+    if (**ppszNext == '/')
+        return VINF_SUCCESS;
+
+    if (   iDigit != 4
+        && (   **ppszNext == '\0'
+            || **ppszNext != '.'))
+        return VERR_INVALID_PARAMETER;
+
+    return VINF_SUCCESS;
+}
+
+
+int RTCidrStrToIPv4(const char *pszAddress, PRTIPV4ADDR pNetwork, PRTIPV4ADDR pNetmask)
+{
+    uint8_t cBits;
+    uint8_t a;
+    uint8_t b = 0;
+    uint8_t c = 0;
+    uint8_t d = 0;
+    const char *psz = pszAddress;
+    char *pszNext;
+    int  rc;
+
+    do
+    {
+        /* 1st digit */
+        rc = scanIPv4Digit(1, psz, &pszNext, &a);
+        if (RT_FAILURE(rc))
+            return rc;
+        if (*pszNext == '/')
+            break;
+        psz = pszNext + 1;
+
+        /* 2nd digit */
+        rc = scanIPv4Digit(2, psz, &pszNext, &b);
+        if (RT_FAILURE(rc))
+            return rc;
+        if (*pszNext == '/')
+            break;
+        psz = pszNext + 1;
+
+        /* 3rd digit */
+        rc = scanIPv4Digit(3, psz, &pszNext, &c);
+        if (RT_FAILURE(rc))
+            return rc;
+        if (*pszNext == '/')
+            break;
+        psz = pszNext + 1;
+
+        /* 4th digit */
+        rc = scanIPv4Digit(4, psz, &pszNext, &d);
+        if (RT_FAILURE(rc))
+            return rc;
+    } while (0);
+
+    if (*pszNext == '/')
+    {
+        psz = pszNext + 1;
+        rc = RTStrToUInt8Ex(psz, &pszNext, 10, &cBits);
+        if (rc != VINF_SUCCESS || cBits < 8 || cBits > 28)
+            return VERR_INVALID_PARAMETER;
+    }
+    else
+        cBits = 0;
+
+    for (psz = pszNext; RT_C_IS_SPACE(*psz); psz++)
+        /* nothing */;
+    if (*psz != '\0')
+        return VERR_INVALID_PARAMETER;
+
+    *pNetwork = RT_MAKE_U32_FROM_U8(d, c, b, a);
+    *pNetmask = ~(((uint32_t)1 << (32 - cBits)) - 1);
+    return VINF_SUCCESS;
+}
