1 files changed, 119 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/misc/cidr.cpp b/src/VBox/Runtime/common/misc/cidr.cpp
new file mode 100644
index 00000000..8f42b367
--- /dev/null
+++ b/src/VBox/Runtime/common/misc/cidr.cpp
@@ -0,0 +1,119 @@
+/* $Id: cidr.cpp $ */
+/** @file
+ * IPRT - IPv4 address parsing.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   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);
+