get_network_params.c

get_network_params.c

/* gcc -std=c11 get_network_params.c -lws2_32 -liphlpapi -o get_network_params.exe */

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

int main(void) {
    FIXED_INFO *fixed_info = (FIXED_INFO[]) { 0 };
    ULONG fixed_info_size = 0;
    GetNetworkParams(fixed_info, &fixed_info_size);
    
    fixed_info = malloc(fixed_info_size);
    if (fixed_info == NULL) {
        puts("Error calling malloc... :(");
        return 0;
    }
    
    if (GetNetworkParams(fixed_info, &fixed_info_size) != NO_ERROR) {
        puts("Error calling GetNetworkParams... :(");
        return 0;
    }
    
    printf("Host Name: %s\n",   fixed_info->HostName);
    printf("Domain Name: %s\n", fixed_info->DomainName);

    char *prefix_msg  = "DNS Servers: ";
    int   indentation = 0;
    for (IP_ADDR_STRING *n = &fixed_info->DnsServerList; n; n = n->Next, prefix_msg = "") {
        indentation = printf("%*s", indentation, prefix_msg);
        printf("%s\n", n->IpAddress.String);
    }
    
    printf("Node Type: %s\n", fixed_info->NodeType == BROADCAST_NODETYPE    ? "Broadcast node"
                            : fixed_info->NodeType == PEER_TO_PEER_NODETYPE ? "Peer to Peer node"
                            : fixed_info->NodeType == MIXED_NODETYPE        ? "Mixed node"
                            : fixed_info->NodeType == HYBRID_NODETYPE       ? "Hybrid node"
                                                                            : "Unknown node");

    printf("DHCP scope name: %s\n", fixed_info->ScopeId);
    printf("Routing: %s\n",   fixed_info->EnableRouting ? "enabled" : "disabled");
    printf("ARP proxy: %s\n", fixed_info->EnableProxy   ? "enabled" : "disabled");
    printf("DNS: %s\n",       fixed_info->EnableDns     ? "enabled" : "disabled");
}