windns_undoc.h File Reference

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Classes
struct	_DNS_CACHE_ENTRY

Typedefs
typedef struct _DNS_CACHE_ENTRY	DNS_CACHE_ENTRY
typedef struct _DNS_CACHE_ENTRY *	PDNS_CACHE_ENTRY

Functions
BOOL WINAPI	DnsFlushResolverCache (VOID)
BOOL WINAPI	DnsGetCacheDataTable (_Out_ PDNS_CACHE_ENTRY *DnsCache)
DWORD WINAPI	GetCurrentTimeInSeconds (VOID)
DNS_STATUS WINAPI	Query_Main (LPCWSTR Name, WORD Type, DWORD Options, PDNS_RECORD *QueryResultSet)

Typedef Documentation

DNS_CACHE_ENTRY

typedef struct _DNS_CACHE_ENTRY DNS_CACHE_ENTRY

PDNS_CACHE_ENTRY

typedef struct _DNS_CACHE_ENTRY * PDNS_CACHE_ENTRY

Function Documentation

DnsFlushResolverCache()

BOOL WINAPI DnsFlushResolverCache

(

VOID

)

Definition at line 933 of file query.c.

{
    DNS_STATUS Status = ERROR_SUCCESS;

    DPRINT("DnsFlushResolverCache()\n");

    RpcTryExcept
    {
        Status = R_ResolverFlushCache(NULL);
        DPRINT("R_ResolverFlushCache() returned %lu\n", Status);
    }
    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = RpcExceptionCode();
        DPRINT("Exception returned %lu\n", Status);
    }
    RpcEndExcept;

    return (Status == ERROR_SUCCESS);
}

Referenced by FlushDns().

DnsGetCacheDataTable()

BOOL WINAPI DnsGetCacheDataTable

(

_Out_ PDNS_CACHE_ENTRY *

DnsCache

)

Definition at line 956 of file query.c.

{
    DNS_STATUS Status = ERROR_SUCCESS;
    PDNS_CACHE_ENTRY CacheEntries = NULL;

    if (DnsCache == NULL)
        return FALSE;

    RpcTryExcept
    {
        Status = CRrReadCache(NULL,
                              &CacheEntries);
        DPRINT("CRrReadCache() returned %lu\n", Status);
    }
    RpcExcept(EXCEPTION_EXECUTE_HANDLER)
    {
        Status = RpcExceptionCode();
        DPRINT1("Exception returned %lu\n", Status);
    }
    RpcEndExcept;

    if (Status != ERROR_SUCCESS)
        return FALSE;

    if (CacheEntries == NULL)
        return FALSE;

    *DnsCache = CacheEntries;

    return TRUE;
}

Referenced by DisplayDns().

GetCurrentTimeInSeconds()

DWORD WINAPI GetCurrentTimeInSeconds

(

VOID

)

Definition at line 991 of file query.c.

{
    FILETIME Time;
    FILETIME Adjustment;
    ULARGE_INTEGER lTime, lAdj;
    SYSTEMTIME st = {1970, 1, 0, 1, 0, 0, 0};

    SystemTimeToFileTime(&st, &Adjustment);
    memcpy(&lAdj, &Adjustment, sizeof(lAdj));
    GetSystemTimeAsFileTime(&Time);
    memcpy(&lTime, &Time, sizeof(lTime));
    lTime.QuadPart -= lAdj.QuadPart;
    return (DWORD)(lTime.QuadPart/10000000ULL);
}

Referenced by WSPAccept(), WSPConnect(), and WSPGetSockOpt().

Query_Main()

DNS_STATUS WINAPI Query_Main	(	LPCWSTR	Name,
		WORD	Type,
		DWORD	Options,
		PDNS_RECORD *	QueryResultSet
	)

Definition at line 654 of file query.c.

{
    adns_state astate;
    int quflags = (Options & DNS_QUERY_NO_RECURSION) == 0 ? adns_qf_search : 0;
    int adns_error;
    adns_answer *answer;
    LPSTR CurrentName;
    unsigned CNameLoop;
    PFIXED_INFO network_info;
    ULONG network_info_blen = 0;
    DWORD network_info_result;
    PIP_ADDR_STRING pip;
    IP4_ADDRESS Address;
    struct in_addr addr;
    PCHAR HostWithDomainName;
    PCHAR AnsiName;
    size_t NameLen = 0;

    if (Name == NULL)
        return ERROR_INVALID_PARAMETER;
    if (QueryResultSet == NULL)
        return ERROR_INVALID_PARAMETER;

    *QueryResultSet = NULL;

    switch (Type)
    {
    case DNS_TYPE_A:
        /* FIXME: how much instead of MAX_PATH? */
        NameLen = WideCharToMultiByte(CP_ACP,
                                      0,
                                      Name,
                                      -1,
                                      NULL,
                                      0,
                                      NULL,
                                      0);
        AnsiName = RtlAllocateHeap(RtlGetProcessHeap(), 0, NameLen);
        if (NULL == AnsiName)
        {
            return ERROR_OUTOFMEMORY;
        }
        WideCharToMultiByte(CP_ACP,
                            0,
                            Name,
                            -1,
                            AnsiName,
                            NameLen,
                            NULL,
                            0);
        NameLen--;

        network_info_result = GetNetworkParams(NULL, &network_info_blen);
        network_info = (PFIXED_INFO)RtlAllocateHeap(RtlGetProcessHeap(), 0, (size_t)network_info_blen);
        if (NULL == network_info)
        {
            return ERROR_OUTOFMEMORY;
        }

        network_info_result = GetNetworkParams(network_info, &network_info_blen);
        if (network_info_result != ERROR_SUCCESS)
        {
            RtlFreeHeap(RtlGetProcessHeap(), 0, network_info);
            return network_info_result;
        }

        if ((Address = CheckForCurrentHostname(NameLen != 0 ? AnsiName : network_info->HostName, network_info)) != 0)
        {
            size_t TempLen = 2, StringLength = 0;
            RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
            StringCchLengthA(network_info->HostName, sizeof(network_info->HostName), &StringLength);
            TempLen += StringLength;
            StringCchLengthA(network_info->DomainName, sizeof(network_info->DomainName), &StringLength);
            TempLen += StringLength;
            HostWithDomainName = (PCHAR)RtlAllocateHeap(RtlGetProcessHeap(), 0, TempLen);
            StringCchCopyA(HostWithDomainName, TempLen, network_info->HostName);
            if (network_info->DomainName[0])
            {
                StringCchCatA(HostWithDomainName, TempLen, ".");
                StringCchCatA(HostWithDomainName, TempLen, network_info->DomainName);
            }
            RtlFreeHeap(RtlGetProcessHeap(), 0, network_info);
            *QueryResultSet = (PDNS_RECORD)RtlAllocateHeap(RtlGetProcessHeap(), 0, sizeof(DNS_RECORD));

            if (NULL == *QueryResultSet)
            {
                RtlFreeHeap(RtlGetProcessHeap(), 0, HostWithDomainName);
                return ERROR_OUTOFMEMORY;
            }

            (*QueryResultSet)->pNext = NULL;
            (*QueryResultSet)->wType = Type;
            (*QueryResultSet)->wDataLength = sizeof(DNS_A_DATA);
            (*QueryResultSet)->Flags.S.Section = DnsSectionAnswer;
            (*QueryResultSet)->Flags.S.CharSet = DnsCharSetUnicode;
            (*QueryResultSet)->Data.A.IpAddress = Address;

            (*QueryResultSet)->pName = (LPSTR)DnsCToW(HostWithDomainName);

            RtlFreeHeap(RtlGetProcessHeap(), 0, HostWithDomainName);
            return (*QueryResultSet)->pName ? ERROR_SUCCESS : ERROR_OUTOFMEMORY;
        }

        if ((Options & DNS_QUERY_NO_WIRE_QUERY) != 0)
        {
            RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
            RtlFreeHeap(RtlGetProcessHeap(), 0, network_info);
            return ERROR_FILE_NOT_FOUND;
        }

        adns_error = adns_init(&astate, adns_if_noenv | adns_if_noerrprint | adns_if_noserverwarn, 0);
        if (adns_error != adns_s_ok)
        {
            RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
            RtlFreeHeap(RtlGetProcessHeap(), 0, network_info);
            return DnsIntTranslateAdnsToDNS_STATUS(adns_error);
        }
        for (pip = &(network_info->DnsServerList); pip; pip = pip->Next)
        {
            addr.s_addr = inet_addr(pip->IpAddress.String);
            if ((addr.s_addr != INADDR_ANY) && (addr.s_addr != INADDR_NONE))
                adns_addserver(astate, addr);
        }
        if (network_info->DomainName[0])
        {
            adns_ccf_search(astate, "LOCALDOMAIN", -1, network_info->DomainName);
        }
        RtlFreeHeap(RtlGetProcessHeap(), 0, network_info);

        if (!adns_numservers(astate))
        {
            /* There are no servers to query so bail out */
            adns_finish(astate);
            RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
            return ERROR_FILE_NOT_FOUND;
        }

        /*
        * adns doesn't resolve chained CNAME records (a CNAME which points to
        * another CNAME pointing to another... pointing to an A record), according
        * to a mailing list thread the authors believe that chained CNAME records
        * are invalid and the DNS entries should be fixed. That's a nice academic
        * standpoint, but there certainly are chained CNAME records out there,
        * even some fairly major ones (at the time of this writing
        * download.mozilla.org is a chained CNAME). Everyone else seems to resolve
        * these fine, so we should too. So we loop here to try to resolve CNAME
        * chains ourselves. Of course, there must be a limit to protect against
        * CNAME loops.
        */

#define CNAME_LOOP_MAX 16

        CurrentName = AnsiName;

        for (CNameLoop = 0; CNameLoop < CNAME_LOOP_MAX; CNameLoop++)
        {
            adns_error = adns_synchronous(astate, CurrentName, adns_r_addr, quflags, &answer);

            if (adns_error != adns_s_ok)
            {
                adns_finish(astate);

                if (CurrentName != AnsiName)
                    RtlFreeHeap(RtlGetProcessHeap(), 0, CurrentName);

                RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
                return DnsIntTranslateAdnsToDNS_STATUS(adns_error);
            }

            if (answer && answer->rrs.addr)
            {
                if (CurrentName != AnsiName)
                    RtlFreeHeap(RtlGetProcessHeap(), 0, CurrentName);

                RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
                *QueryResultSet = (PDNS_RECORD)RtlAllocateHeap(RtlGetProcessHeap(), 0, sizeof(DNS_RECORD));

                if (NULL == *QueryResultSet)
                {
                    adns_finish(astate);
                    return ERROR_OUTOFMEMORY;
                }

                (*QueryResultSet)->pNext = NULL;
                (*QueryResultSet)->wType = Type;
                (*QueryResultSet)->wDataLength = sizeof(DNS_A_DATA);
                (*QueryResultSet)->Flags.S.Section = DnsSectionAnswer;
                (*QueryResultSet)->Flags.S.CharSet = DnsCharSetUnicode;
                (*QueryResultSet)->Data.A.IpAddress = answer->rrs.addr->addr.inet.sin_addr.s_addr;

                adns_finish(astate);

                (*QueryResultSet)->pName = (LPSTR)xstrsave(Name);

                return (*QueryResultSet)->pName ? ERROR_SUCCESS : ERROR_OUTOFMEMORY;
            }

            if (NULL == answer || adns_s_prohibitedcname != answer->status || NULL == answer->cname)
            {
                adns_finish(astate);

                if (CurrentName != AnsiName)
                    RtlFreeHeap(RtlGetProcessHeap(), 0, CurrentName);

                RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
                return ERROR_FILE_NOT_FOUND;
            }

            if (CurrentName != AnsiName)
                RtlFreeHeap(RtlGetProcessHeap(), 0, CurrentName);

            CurrentName = (LPSTR)xstrsaveA(answer->cname);

            if (!CurrentName)
            {
                RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
                adns_finish(astate);
                return ERROR_OUTOFMEMORY;
            }
        }

        adns_finish(astate);
        RtlFreeHeap(RtlGetProcessHeap(), 0, AnsiName);
        RtlFreeHeap(RtlGetProcessHeap(), 0, CurrentName);
        return ERROR_FILE_NOT_FOUND;

    default:
        return ERROR_OUTOFMEMORY; /* XXX arty: find a better error code. */
    }
}

Referenced by R_ResolverQuery().