ipaddr.c

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#include <windows.h>
#include <winsock.h>
#include        <stdio.h>

#include <string.h>
#include "ipaddr.h"

#define MAXHOSTNAME     256

static  void    IPAddr_AddrToString(unsigned long Addr, char *AddrBuff)
{
        AddrBuff += sprintf(AddrBuff, "%d.", Addr & 0xff);
        Addr = Addr >> 8;

        AddrBuff += sprintf(AddrBuff, "%d.", Addr & 0xff);
        Addr = Addr >> 8;

        AddrBuff += sprintf(AddrBuff, "%d.", Addr & 0xff);
        Addr = Addr >> 8;

                                sprintf(AddrBuff, "%d",  Addr & 0xff);
}

#define WS_VERSION_REQD         0x0101
#define WS_VERSION_MAJOR    HIBYTE(WS_VERSION_REQD)
#define WS_VERSION_MINOR    LOBYTE(WS_VERSION_REQD)

int IPAddr_GetHostID (char *AddrBuff)
{
        WSADATA                 wsaData;
    char                        HostName[MAXHOSTNAME];
    LPHOSTENT           HostEnt;
    SOCKADDR_IN         LocalAddress;
    SOCKADDR_IN         RemoteAddress;
    SOCKET                      Socket;
    int                         Res;
        int                             i;

        Res = WSAStartup(WS_VERSION_REQD,&wsaData);
        if      (Res != 0)
                return 0;

        if      (( LOBYTE (wsaData.wVersion) < WS_VERSION_MAJOR) || 
                ( LOBYTE (wsaData.wVersion) == WS_VERSION_MAJOR &&
                HIBYTE (wsaData.wVersion) < WS_VERSION_MINOR))
        {
                return 0;
        }

    LocalAddress.sin_addr.s_addr = INADDR_ANY;
    
    Res = gethostname(HostName, sizeof(HostName));
    if  (Res != SOCKET_ERROR)
    {
                HostEnt = gethostbyname(HostName);
                if      (HostEnt)
                {
                        IPAddr_AddrToString(*(unsigned long *)HostEnt->h_addr_list[0], AddrBuff);
                        i = 0;
                        while   (HostEnt->h_addr_list[i])
                                i++;
                        return i;
                }
    } 
    
    Socket = socket(AF_INET, SOCK_DGRAM, 0);
        if      (Socket != INVALID_SOCKET)
        {
                RemoteAddress.sin_family                = AF_INET;
                RemoteAddress.sin_port                  = htons(IPPORT_ECHO);
                RemoteAddress.sin_addr.s_addr   = inet_addr("199.1.90.2");
                Res = connect(Socket, (SOCKADDR *)&RemoteAddress, sizeof(SOCKADDR));
                if      (Res != SOCKET_ERROR)
                {
                        int     AddrSize = sizeof(SOCKADDR);

                        getsockname(Socket, (LPSOCKADDR)&LocalAddress, (int *)&AddrSize);

                        IPAddr_AddrToString(LocalAddress.sin_addr.s_addr, AddrBuff);

                        return 1;
                }

                closesocket(Socket);
        }

        return 0;
}

#if 0
void    main(void)
{
        char    Buff[16];
        int             Count;

        Count = IPAddr_GetHostID(Buff);
        printf("%d addrs\n", Count);
        printf("%s\n", Buff);
}
#endif

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