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GetUnicastIpAddressEntry function

The GetUnicastIpAddressEntry function retrieves information for an existing unicast IP address entry on the local computer.

Syntax


NETIOAPI_API GetUnicastIpAddressEntry(
  _Inout_  PMIB_UNICASTIPADDRESS_ROW Row
);

Parameters

Row [in, out]

A pointer to a MIB_UNICASTIPADDRESS_ROW structure entry for a unicast IP address entry. On successful return, this structure will be updated with the properties for an existing unicast IP address.

Return value

If the function succeeds, the return value is NO_ERROR.

If the function fails, the return value is one of the following error codes.

Return codeDescription
ERROR_FILE_NOT_FOUND

The system cannot find the file specified. This error is returned if the network interface LUID or interface index specified by the InterfaceLuid or InterfaceIndex member of the MIB_UNICASTIPADDRESS_ROW pointed to by the Row parameter is not a value on the local machine.

ERROR_INVALID_PARAMETER

A parameter is incorrect. This error is returned if a NULL pointer is passed in the Row parameter, the Address member of the MIB_UNICASTIPADDRESS_ROW pointed to by the Row parameter is not set to a valid unicast IPv4 or IPv6 address, or both the InterfaceLuid and InterfaceIndex members of the MIB_UNICASTIPADDRESS_ROW pointed to by the Row parameter are unspecified.

ERROR_NOT_FOUND

Element not found. This error is returned if the network interface specified by the InterfaceLuid or InterfaceIndex member of the MIB_UNICASTIPADDRESS_ROW structure pointed to by the Row parameter does not match the IP address specified in the Address member in the MIB_UNICASTIPADDRESS_ROW structure.

ERROR_NOT_SUPPORTED

The request is not supported. This error is returned if no IPv4 stack is on the local computer and an IPv4 address is specified in the Address member of the MIB_UNICASTIPADDRESS_ROW structure pointed to by the Row parameter. This error is also returned if no IPv6 stack is on the local computer and an IPv6 address is specified in the Address member.

Other

Use FormatMessage to obtain the message string for the returned error.

 

Remarks

The GetUnicastIpAddressEntry function is defined on Windows Vista and later.

The GetUnicastIpAddressEntry function is normally used to retrieve an existing MIB_UNICASTIPADDRESS_ROW structure entry to be modified. An application can then change the members in the MIB_UNICASTIPADDRESS_ROW entry it wishes to modify, and then call the SetUnicastIpAddressEntry function.

On input, the Address member in the MIB_UNICASTIPADDRESS_ROW structure pointed to by the Row parameter must be initialized to a valid unicast IPv4 or IPv6 address. The si_family member of the SOCKADDR_INET structure in the Address member must be initialized to either AF_INET or AF_INET6 and the related Ipv4 or Ipv6 member of the SOCKADDR_INET structure must be set to a valid unicast IP address. In addition, at least one of the following members in the MIB_UNICASTIPADDRESS_ROW structure pointed to the Row parameter must be initialized: the InterfaceLuid or InterfaceIndex. The fields are used in the order listed above. So if the InterfaceLuid is specified, then this member is used to determine the interface. If no value is set for the InterfaceLuid member (the value of this member is set to zero), then the InterfaceIndex member is next used to determine the interface.

On output when the call is successful, GetUnicastIpAddressEntry retrieves the other properties for the unicast IP address and fills out the MIB_UNICASTIPADDRESS_ROW structure pointed to by the Row parameter.

The GetUnicastIpAddressTable function can be called to enumerate the unicast IP address entries on a local computer.

Examples

The following example retrieves a unicast IP address entry specified on the command line and prints some values from the retrieved MIB_UNICASTIPADDRESS_ROW structure.



#ifndef UNICODE
#define UNICODE
#endif

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <Windows.h.>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <ws2ipdef.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>

// Need to link with Iphlpapi.lib and Ws2_32.lib
#pragma comment (lib, "iphlpapi.lib")
#pragma comment (lib, "Ws2_32.lib")

void PrintUnicastIpAddress(PMIB_UNICASTIPADDRESS_ROW pIpRow);

int __cdecl wmain(int argc, WCHAR **argv)
{

    // Declare and initialize variables

    ULONG Result = 0;
    ULONG ifIndex;

    // default to unspecified address family
    ULONG addressFamily = AF_UNSPEC;

    IN_ADDR Ipv4Addr;
    IN6_ADDR Ipv6Addr;

    MIB_UNICASTIPADDRESS_ROW ipRow = {0};
    
    // Validate the parameters
    if (argc < 4) {
        wprintf(L"usage: %s <AddressFamily> <IPAddress> <InterfaceIndex>\n", argv[0]);
        wprintf(L"   Gets the UnicastIpAddressEntry for an AddressFamily,\n");
        wprintf(L"     Interface Index, and IP address\n");
        wprintf(L"   Examples\n");
        wprintf(L"     Get the IPv4 loopback at interface index=1\n");
        wprintf(L"       %s 4 127.0.0.1 1\n", argv[0]);
        wprintf(L"     Get the IPv6 loopback at interface index=1\n");
        wprintf(L"       %s 6 ::1 1\n", argv[0]);
        exit(1);
    }

    if (_wtoi(argv[1]) == 4) {
        addressFamily = AF_INET;
        if (InetPtonW(addressFamily, argv[2], &Ipv4Addr) != 1) {
            wprintf(L"Unable to parse IPv4 address string: %s\n", argv[3]);
            exit(1);
        }
    } else if (_wtoi(argv[1]) == 6) {
        addressFamily = AF_INET6;
        if (InetPton(addressFamily, argv[2], &Ipv6Addr) != 1) {
            wprintf(L"Unable to parse IPv6 address string: %s\n", argv[3]);
            exit(1);
        }
    }

    ifIndex = _wtoi(argv[3]);

    ipRow.Address.si_family = (ADDRESS_FAMILY) addressFamily;
    ipRow.InterfaceIndex = ifIndex;

    if (addressFamily == AF_INET) {
        ipRow.Address.si_family = AF_INET;
        memcpy(&ipRow.Address.Ipv4.sin_addr, &Ipv4Addr, sizeof (IN_ADDR));
    }
    if (addressFamily == AF_INET6) {
        ipRow.Address.si_family = AF_INET6;
        memcpy(&ipRow.Address.Ipv6.sin6_addr, &Ipv6Addr, sizeof (IN6_ADDR));
    }

    Result = GetUnicastIpAddressEntry(&ipRow);
    if (Result != NO_ERROR) {
        wprintf(L"GetUnicastIpAddressEntry returned error: %lu\n", Result);
        exit(1);
    }
    PrintUnicastIpAddress(&ipRow);
    
    exit(0);
}

void PrintUnicastIpAddress(PMIB_UNICASTIPADDRESS_ROW pipRow)
{

    WCHAR Ipv4String[16] = { 0 };
    WCHAR Ipv6String[46] = { 0 };

    // Print some variables from the rows in the table
    wprintf(L"AddressFamily:\t\t\t ");
    switch (pipRow->Address.si_family) {
    case AF_INET:
        wprintf(L"IPv4\n");
        if (InetNtop(AF_INET, &pipRow->Address.Ipv4.sin_addr, Ipv4String, 16) !=
            NULL)
            wprintf(L"IPv4 Address:\t\t\t %ws\n", Ipv4String);
        break;
    case AF_INET6:
        wprintf(L"IPv6\n");
        if (InetNtop(AF_INET6, &pipRow->Address.Ipv6.sin6_addr, Ipv6String, 46)
            != NULL)
            wprintf(L"IPv6 Address:\t\t\t %s\n", Ipv6String);
        break;
    default:
        wprintf(L"Other: %d\n", pipRow->Address.si_family);
        break;
    }

    wprintf(L"Interface LUID NetLuidIndex:\t %lu\n",
           pipRow->InterfaceLuid.Info.NetLuidIndex);
    wprintf(L"Interface LUID IfType:\t\t ");
    switch (pipRow->InterfaceLuid.Info.IfType) {
    case IF_TYPE_OTHER:
        wprintf(L"Other\n");
        break;
    case IF_TYPE_ETHERNET_CSMACD:
        wprintf(L"Ethernet\n");
        break;
    case IF_TYPE_ISO88025_TOKENRING:
        wprintf(L"Token ring\n");
        break;
    case IF_TYPE_PPP:
        wprintf(L"PPP\n");
        break;
    case IF_TYPE_SOFTWARE_LOOPBACK:
        wprintf(L"Software loopback\n");
        break;
    case IF_TYPE_ATM:
        wprintf(L"ATM\n");
        break;
    case IF_TYPE_IEEE80211:
        wprintf(L"802.11 wireless\n");
        break;
    case IF_TYPE_TUNNEL:
        wprintf(L"Tunnel encapsulation\n");
        break;
    case IF_TYPE_IEEE1394:
        wprintf(L"IEEE 1394 (Firewire)\n");
        break;
    default:
        wprintf(L"Unknown: %d\n", pipRow->InterfaceLuid.Info.IfType);
        break;
    }

    wprintf(L"Interface Index:\t\t %lu\n", pipRow->InterfaceIndex);

    wprintf(L"Prefix Origin:\t\t\t ");
    switch (pipRow->PrefixOrigin) {
    case IpPrefixOriginOther:
        wprintf(L"IpPrefixOriginOther\n");
        break;
    case IpPrefixOriginManual:
        wprintf(L"IpPrefixOriginManual\n");
        break;
    case IpPrefixOriginWellKnown:
        wprintf(L"IpPrefixOriginWellKnown\n");
        break;
    case IpPrefixOriginDhcp:
        wprintf(L"IpPrefixOriginDhcp\n");
        break;
    case IpPrefixOriginRouterAdvertisement:
        wprintf(L"IpPrefixOriginRouterAdvertisement\n");
        break;
    case IpPrefixOriginUnchanged:
        wprintf(L"IpPrefixOriginUnchanged\n");
        break;
    default:
        wprintf(L"Unknown: %d\n", pipRow->PrefixOrigin);
        break;
    }

    wprintf(L"Suffix Origin:\t\t\t ");
    switch (pipRow->SuffixOrigin) {
    case IpSuffixOriginOther:
        wprintf(L"IpSuffixOriginOther\n");
        break;
    case IpSuffixOriginManual:
        wprintf(L"IpSuffixOriginManual\n");
        break;
    case IpSuffixOriginWellKnown:
        wprintf(L"IpSuffixOriginWellKnown\n");
        break;
    case IpSuffixOriginDhcp:
        wprintf(L"IpSuffixOriginDhcp\n");
        break;
    case IpSuffixOriginLinkLayerAddress:
        wprintf(L"IpSuffixOriginLinkLayerAddress\n");
        break;
    case IpSuffixOriginRandom:
        wprintf(L"IpSuffixOriginRandom\n");
        break;
    case IpSuffixOriginUnchanged:
        wprintf(L"IpSuffixOriginUnchanged\n");
        break;
    default:
        wprintf(L"Unknown: %d\n", pipRow->SuffixOrigin);
        break;
    }

    wprintf(L"Valid Lifetime:\t\t\t 0x%x (%u)\n",
           pipRow->ValidLifetime, pipRow->ValidLifetime);

    wprintf(L"Preferred Lifetime:\t\t 0x%x (%u)\n",
           pipRow->PreferredLifetime, pipRow->PreferredLifetime);

    wprintf(L"OnLink PrefixLength:\t\t %lu\n", pipRow->OnLinkPrefixLength);

    wprintf(L"Skip As Source:\t\t\t ");
    if (pipRow->SkipAsSource)
        wprintf(L"Yes\n");
    else
        wprintf(L"No\n");

    wprintf(L"Dad State:\t\t\t ");
    switch (pipRow->DadState) {
    case IpDadStateInvalid:
        wprintf(L"IpDadStateInvalid\n");
        break;
    case IpDadStateTentative:
        wprintf(L"IpDadStateTentative\n");
        break;
    case IpDadStateDuplicate:
        wprintf(L"IpDadStateDuplicate\n");
        break;
    case IpDadStateDeprecated:
        wprintf(L"IpDadStateDeprecated\n");
        break;
    case IpDadStatePreferred:
        wprintf(L"IpDadStatePreferred\n");
        break;
    default:
        wprintf(L"Unknown: %d\n", pipRow->DadState);
        break;
    }

    wprintf(L"\n");
}



Requirements

Minimum supported client

Windows Vista [desktop apps only]

Minimum supported server

Windows Server 2008 [desktop apps only]

Header

Netioapi.h (include Iphlpapi.h)

Library

Iphlpapi.lib

DLL

Iphlpapi.dll

See also

CreateUnicastIpAddressEntry
DeleteUnicastIpAddressEntry
GetUnicastIpAddressTable
InitializeUnicastIpAddressEntry
IP Helper Function Reference
MIB_UNICASTIPADDRESS_ROW
MIB_UNICASTIPADDRESS_TABLE
NotifyUnicastIpAddressChange
SetUnicastIpAddressEntry

 

 

Build date: 11/16/2013

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