source: trunk/testapp/network/iphlpapi/GetAdaptersInfo.c

#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>

#include <time.h>

#define errno_t int

int __cdecl main()
{
    /* Declare and initialize variables */

// It is possible for an adapter to have multiple
// IPv4 addresses, gateways, and secondary WINS servers
// assigned to the adapter. 
//
// Note that this sample code only prints out the 
// first entry for the IP address/mask, and gateway, and
// the primary and secondary WINS server for each adapter. 

    PIP_ADAPTER_INFO pAdapterInfo;
    PIP_ADAPTER_INFO pAdapter = NULL;
    DWORD dwRetVal = 0;
    UINT i;

/* variables used to print DHCP time info */
    struct tm *newtime;
    char buffer[32];
    errno_t error;

    ULONG ulOutBufLen = sizeof (IP_ADAPTER_INFO);
    pAdapterInfo = (IP_ADAPTER_INFO *) malloc(sizeof (IP_ADAPTER_INFO));
    if (pAdapterInfo == NULL) {
        printf("Error allocating memory needed to call GetAdaptersinfo\n");
        return 1;
    }
// Make an initial call to GetAdaptersInfo to get
// the necessary size into the ulOutBufLen variable
    if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
        free(pAdapterInfo);
        pAdapterInfo = (IP_ADAPTER_INFO *) malloc(ulOutBufLen);
        if (pAdapterInfo == NULL) {
            printf("Error allocating memory needed to call GetAdaptersinfo\n");
            return 1;
        }
    }

    if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {
        pAdapter = pAdapterInfo;
        while (pAdapter) {
            printf("\tComboIndex: \t%d\n", pAdapter->ComboIndex);
            printf("\tAdapter Name: \t%s\n", pAdapter->AdapterName);
            printf("\tAdapter Desc: \t%s\n", pAdapter->Description);
            printf("\tAdapter Addr: \t");
            for (i = 0; i < pAdapter->AddressLength; i++) {
                if (i == (pAdapter->AddressLength - 1))
                    printf("%.2X\n", (int) pAdapter->Address[i]);
                else
                    printf("%.2X-", (int) pAdapter->Address[i]);
            }
            printf("\tIndex: \t%d\n", pAdapter->Index);
            printf("\tType: \t");
            switch (pAdapter->Type) {
            case MIB_IF_TYPE_OTHER:
                printf("Other\n");
                break;
            case MIB_IF_TYPE_ETHERNET:
                printf("Ethernet\n");
                break;
            case MIB_IF_TYPE_TOKENRING:
                printf("Token Ring\n");
                break;
            case MIB_IF_TYPE_FDDI:
                printf("FDDI\n");
                break;
            case MIB_IF_TYPE_PPP:
                printf("PPP\n");
                break;
            case MIB_IF_TYPE_LOOPBACK:
                printf("Lookback\n");
                break;
            case MIB_IF_TYPE_SLIP:
                printf("Slip\n");
                break;
            default:
                printf("Unknown type %ld\n", pAdapter->Type);
                break;
            }

            printf("\tIP Address: \t%s\n",
                   pAdapter->IpAddressList.IpAddress.String);
            printf("\tIP Mask: \t%s\n", pAdapter->IpAddressList.IpMask.String);

            printf("\tGateway: \t%s\n", pAdapter->GatewayList.IpAddress.String);
            printf("\t***\n");

            if (pAdapter->DhcpEnabled) {
                printf("\tDHCP Enabled: Yes\n");
                printf("\t  DHCP Server: \t%s\n",
                       pAdapter->DhcpServer.IpAddress.String);

                printf("\t  Lease Obtained: ");
                /* Display local time */
                newtime = localtime((time_t*) &pAdapter->LeaseObtained);
                if (!newtime)
                    printf("Invalid Argument to localtime\n");
                else {
                    // Convert to an ASCII representation 
                    char *str = asctime(newtime);
                    if (!str)
                        printf("Invalid Argument to asctime_s\n");
                    else
                        /* asctime_s returns the string terminated by \n\0 */
                        printf("%s", str);
                }

                printf("\t  Lease Expires:  ");
                newtime = localtime((time_t*) &pAdapter->LeaseExpires);
                if (!newtime)
                    printf("Invalid Argument to localtime\n");
                else {
                    // Convert to an ASCII representation 
                    char *str = asctime(newtime);
                    if (!str)
                        printf("Invalid Argument to asctime_s\n");
                    else
                        /* asctime_s returns the string terminated by \n\0 */
                        printf("%s", str);
                }
            } else
                printf("\tDHCP Enabled: No\n");

            if (pAdapter->HaveWins) {
                printf("\tHave Wins: Yes\n");
                printf("\t  Primary Wins Server:    %s\n",
                       pAdapter->PrimaryWinsServer.IpAddress.String);
                printf("\t  Secondary Wins Server:  %s\n",
                       pAdapter->SecondaryWinsServer.IpAddress.String);
            } else
                printf("\tHave Wins: No\n");
            pAdapter = pAdapter->Next;
            printf("\n");
        }
    } else {
        printf("GetAdaptersInfo failed with error: %d\n", dwRetVal);

    }
    if (pAdapterInfo)
        free(pAdapterInfo);

    return 0;
}