win_list.c

/*
 * MIT License
 *
 * Copyright (c) 2018 Lewis Van Winkle
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0600
#endif

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

#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "iphlpapi.lib")

int main() {

    WSADATA d;
    if (WSAStartup(MAKEWORD(2, 2), &d)) {
        printf("Failed to initialize.\n");
        return -1;
    }


    DWORD asize = 20000;
    PIP_ADAPTER_ADDRESSES adapters;
    do {
        adapters = (PIP_ADAPTER_ADDRESSES)malloc(asize);

        if (!adapters) {
            printf("Couldn't allocate %ld bytes for adapters.\n", asize);
            WSACleanup();
            return -1;
        }

        int r = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, 0,
                adapters, &asize);
        if (r == ERROR_BUFFER_OVERFLOW) {
            printf("GetAdaptersAddresses wants %ld bytes.\n", asize);
            free(adapters);
        } else if (r == ERROR_SUCCESS) {
            break;
        } else {
            printf("Error from GetAdaptersAddresses: %d\n", r);
            free(adapters);
            WSACleanup();
            return -1;
        }
    } while (!adapters);


    PIP_ADAPTER_ADDRESSES adapter = adapters;
    while (adapter) {
        printf("\nAdapter name: %S\n", adapter->FriendlyName);

        PIP_ADAPTER_UNICAST_ADDRESS address = adapter->FirstUnicastAddress;
        while (address) {
            printf("\t%s",
                    address->Address.lpSockaddr->sa_family == AF_INET ?
                    "IPv4" : "IPv6");

            char ap[100];

            getnameinfo(address->Address.lpSockaddr,
                    address->Address.iSockaddrLength,
                    ap, sizeof(ap), 0, 0, NI_NUMERICHOST);
            printf("\t%s\n", ap);

            address = address->Next;
        }

        adapter = adapter->Next;
    }


    free(adapters);
    WSACleanup();
    return 0;
}