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/*++
Copyright (c) Microsoft Corporation. All rights reserved.
Module Name:
wspiapi.h
Abstract:
The file contains protocol independent API functions.
Revision History:
Wed Jul 12 10:50:31 2000, Created
--*/
#ifndef _WSPIAPI_H_
#define _WSPIAPI_H_
#include <stdio.h> // sprintf()
#include <stdlib.h> // calloc(), strtoul()
#include <malloc.h> // calloc()
#include <string.h> // strlen(), strcmp(), strstr()
#define WspiapiMalloc(tSize) calloc(1, (tSize))
#define WspiapiFree(p) free(p)
#define WspiapiSwap(a, b, c) { (c) = (a); (a) = (b); (b) = (c); }
#define getaddrinfo WspiapiGetAddrInfo
#define getnameinfo WspiapiGetNameInfo
#define freeaddrinfo WspiapiFreeAddrInfo
typedef int (WINAPI *WSPIAPI_PGETADDRINFO) (
IN const char *nodename,
IN const char *servname,
IN const struct addrinfo *hints,
OUT struct addrinfo **res);
typedef int (WINAPI *WSPIAPI_PGETNAMEINFO) (
IN const struct sockaddr *sa,
IN socklen_t salen,
OUT char *host,
IN size_t hostlen,
OUT char *serv,
IN size_t servlen,
IN int flags);
typedef void (WINAPI *WSPIAPI_PFREEADDRINFO) (
IN struct addrinfo *ai);
#ifdef __cplusplus
extern "C" {
#endif
////////////////////////////////////////////////////////////
// v4 only versions of getaddrinfo and friends.
// NOTE: gai_strerror is inlined in ws2tcpip.h
////////////////////////////////////////////////////////////
_inline
char *
WINAPI
WspiapiStrdup (
IN const char * pszString)
/*++
Routine Description
allocates enough storage via calloc() for a copy of the string,
copies the string into the new memory, and returns a pointer to it.
Arguments
pszString string to copy into new memory
Return Value
a pointer to the newly allocated storage with the string in it.
NULL if enough memory could not be allocated, or string was NULL.
--*/
{
char *pszMemory;
if (!pszString)
return(NULL);
pszMemory = (char *) WspiapiMalloc(strlen(pszString) + 1);
if (!pszMemory)
return(NULL);
return(strcpy(pszMemory, pszString));
}
__inline
BOOL
WINAPI
WspiapiParseV4Address (
IN const char * pszAddress,
OUT PDWORD pdwAddress)
/*++
Routine Description
get the IPv4 address (in network byte order) from its string
representation. the syntax should be a.b.c.d.
Arguments
pszArgument string representation of the IPv4 address
ptAddress pointer to the resulting IPv4 address
Return Value
Returns FALSE if there is an error, TRUE for success.
--*/
{
DWORD dwAddress = 0;
const char *pcNext = NULL;
int iCount = 0;
// ensure there are 3 '.' (periods)
for (pcNext = pszAddress; *pcNext != '\0'; pcNext++)
if (*pcNext == '.')
iCount++;
if (iCount != 3)
return FALSE;
// return an error if dwAddress is INADDR_NONE (255.255.255.255)
// since this is never a valid argument to getaddrinfo.
dwAddress = inet_addr(pszAddress);
if (dwAddress == INADDR_NONE)
return FALSE;
*pdwAddress = dwAddress;
return TRUE;
}
__inline
struct addrinfo *
WINAPI
WspiapiNewAddrInfo (
IN int iSocketType,
IN int iProtocol,
IN WORD wPort,
IN DWORD dwAddress)
/*++
Routine Description
allocate an addrinfo structure and populate fields.
IPv4 specific internal function, not exported.
Arguments
iSocketType SOCK_*. can be wildcarded (zero).
iProtocol IPPROTO_*. can be wildcarded (zero).
wPort port number of service (in network order).
dwAddress IPv4 address (in network order).
Return Value
returns an addrinfo struct, or NULL if out of memory.
--*/
{
struct addrinfo *ptNew;
struct sockaddr_in *ptAddress;
// allocate a new addrinfo structure.
ptNew =
(struct addrinfo *) WspiapiMalloc(sizeof(struct addrinfo));
if (!ptNew)
return NULL;
ptAddress =
(struct sockaddr_in *) WspiapiMalloc(sizeof(struct sockaddr_in));
if (!ptAddress)
{
WspiapiFree(ptNew);
return NULL;
}
ptAddress->sin_family = AF_INET;
ptAddress->sin_port = wPort;
ptAddress->sin_addr.s_addr = dwAddress;
// fill in the fields...
ptNew->ai_family = PF_INET;
ptNew->ai_socktype = iSocketType;
ptNew->ai_protocol = iProtocol;
ptNew->ai_addrlen = sizeof(struct sockaddr_in);
ptNew->ai_addr = (struct sockaddr *) ptAddress;
return ptNew;
}
__inline
int
WINAPI
WspiapiQueryDNS(
IN const char *pszNodeName,
IN int iSocketType,
IN int iProtocol,
IN WORD wPort,
OUT char *pszAlias,
OUT struct addrinfo **pptResult)
/*++
Routine Description
helper routine for WspiapiLookupNode.
performs name resolution by querying the DNS for A records.
*pptResult would need to be freed if an error is returned.
Arguments
pszNodeName name of node to resolve.
iSocketType SOCK_*. can be wildcarded (zero).
iProtocol IPPROTO_*. can be wildcarded (zero).
wPort port number of service (in network order).
pszAlias where to return the alias.
pptResult where to return the result.
Return Value
Returns 0 on success, an EAI_* style error value otherwise.
--*/
{
struct addrinfo **pptNext = pptResult;
struct hostent *ptHost = NULL;
char **ppAddresses;
*pptNext = NULL;
pszAlias[0] = '\0';
ptHost = gethostbyname(pszNodeName);
if (ptHost)
{
if ((ptHost->h_addrtype == AF_INET) &&
(ptHost->h_length == sizeof(struct in_addr)))
{
for (ppAddresses = ptHost->h_addr_list;
*ppAddresses != NULL;
ppAddresses++)
{
// create an addrinfo structure...
*pptNext = WspiapiNewAddrInfo(
iSocketType,
iProtocol,
wPort,
((struct in_addr *) *ppAddresses)->s_addr);
if (!*pptNext)
return EAI_MEMORY;
pptNext = &((*pptNext)->ai_next);
}
}
// pick up the canonical name.
strcpy(pszAlias, ptHost->h_name);
return 0;
}
switch (WSAGetLastError())
{
case WSAHOST_NOT_FOUND: return EAI_NONAME;
case WSATRY_AGAIN: return EAI_AGAIN;
case WSANO_RECOVERY: return EAI_FAIL;
case WSANO_DATA: return EAI_NODATA;
default: return EAI_NONAME;
}
}
__inline
int
WINAPI
WspiapiLookupNode(
IN const char *pszNodeName,
IN int iSocketType,
IN int iProtocol,
IN WORD wPort,
IN BOOL bAI_CANONNAME,
OUT struct addrinfo **pptResult)
/*++
Routine Description
resolve a nodename and return a list of addrinfo structures.
IPv4 specific internal function, not exported.
*pptResult would need to be freed if an error is returned.
NOTE: if bAI_CANONNAME is true, the canonical name should be
returned in the first addrinfo structure.
Arguments
pszNodeName name of node to resolve.
iSocketType SOCK_*. can be wildcarded (zero).
iProtocol IPPROTO_*. can be wildcarded (zero).
wPort port number of service (in network order).
bAI_CANONNAME whether the AI_CANONNAME flag is set.
pptResult where to return result.
Return Value
Returns 0 on success, an EAI_* style error value otherwise.
--*/
{
int iError = 0;
int iAliasCount = 0;
char szFQDN1[NI_MAXHOST] = "";
char szFQDN2[NI_MAXHOST] = "";
char *pszName = szFQDN1;
char *pszAlias = szFQDN2;
char *pszScratch = NULL;
strcpy(pszName, pszNodeName);
for (;;)
{
iError = WspiapiQueryDNS(pszNodeName,
iSocketType,
iProtocol,
wPort,
pszAlias,
pptResult);
if (iError)
break;
// if we found addresses, then we are done.
if (*pptResult)
break;
// stop infinite loops due to DNS misconfiguration. there appears
// to be no particular recommended limit in RFCs 1034 and 1035.
if ((!strlen(pszAlias)) ||
(!strcmp(pszName, pszAlias)) ||
(++iAliasCount == 16))
{
iError = EAI_FAIL;
break;
}
// there was a new CNAME, look again.
WspiapiSwap(pszName, pszAlias, pszScratch);
}
if (!iError && bAI_CANONNAME)
{
(*pptResult)->ai_canonname = WspiapiStrdup(pszAlias);
if (!(*pptResult)->ai_canonname)
iError = EAI_MEMORY;
}
return iError;
}
__inline
int
WINAPI
WspiapiClone (
IN WORD wPort,
IN struct addrinfo *ptResult)
/*++
Routine Description
clone every addrinfo structure in ptResult for the UDP service.
ptResult would need to be freed if an error is returned.
Arguments
wPort port number of UDP service.
ptResult list of addrinfo structures, each
of whose node needs to be cloned.
Return Value
Returns 0 on success, an EAI_MEMORY on allocation failure.
--*/
{
struct addrinfo *ptNext = NULL;
struct addrinfo *ptNew = NULL;
for (ptNext = ptResult; ptNext != NULL; )
{
// create an addrinfo structure...
ptNew = WspiapiNewAddrInfo(
SOCK_DGRAM,
ptNext->ai_protocol,
wPort,
((struct sockaddr_in *) ptNext->ai_addr)->sin_addr.s_addr);
if (!ptNew)
break;
// link the cloned addrinfo
ptNew->ai_next = ptNext->ai_next;
ptNext->ai_next = ptNew;
ptNext = ptNew->ai_next;
}
if (ptNext != NULL)
return EAI_MEMORY;
return 0;
}
__inline
void
WINAPI
WspiapiLegacyFreeAddrInfo (
IN struct addrinfo *ptHead)
/*++
Routine Description
Free an addrinfo structure (or chain of structures).
As specified in RFC 2553, Section 6.4.
Arguments
ptHead structure (chain) to free
--*/
{
struct addrinfo *ptNext; // next strcture to free
for (ptNext = ptHead; ptNext != NULL; ptNext = ptHead)
{
if (ptNext->ai_canonname)
WspiapiFree(ptNext->ai_canonname);
if (ptNext->ai_addr)
WspiapiFree(ptNext->ai_addr);
ptHead = ptNext->ai_next;
WspiapiFree(ptNext);
}
}
__inline
int
WINAPI
WspiapiLegacyGetAddrInfo(
IN const char *pszNodeName,
IN const char *pszServiceName,
IN const struct addrinfo *ptHints,
OUT struct addrinfo **pptResult)
/*++
Routine Description
Protocol-independent name-to-address translation.
As specified in RFC 2553, Section 6.4.
This is the hacked version that only supports IPv4.
Arguments
pszNodeName node name to lookup.
pszServiceName service name to lookup.
ptHints hints about how to process request.
pptResult where to return result.
Return Value
returns zero if successful, an EAI_* error code if not.
--*/
{
int iError = 0;
int iFlags = 0;
int iFamily = PF_UNSPEC;
int iSocketType = 0;
int iProtocol = 0;
WORD wPort = 0;
DWORD dwAddress = 0;
struct servent *ptService = NULL;
char *pc = NULL;
BOOL bClone = FALSE;
WORD wTcpPort = 0;
WORD wUdpPort = 0;
// initialize pptResult with default return value.
*pptResult = NULL;
////////////////////////////////////////
// validate arguments...
//
// both the node name and the service name can't be NULL.
if ((!pszNodeName) && (!pszServiceName))
return EAI_NONAME;
// validate hints.
if (ptHints)
{
// all members other than ai_flags, ai_family, ai_socktype
// and ai_protocol must be zero or a null pointer.
if ((ptHints->ai_addrlen != 0) ||
(ptHints->ai_canonname != NULL) ||
(ptHints->ai_addr != NULL) ||
(ptHints->ai_next != NULL))
{
return EAI_FAIL;
}
// the spec has the "bad flags" error code, so presumably we
// should check something here. insisting that there aren't
// any unspecified flags set would break forward compatibility,
// however. so we just check for non-sensical combinations.
//
// we cannot come up with a canonical name given a null node name.
iFlags = ptHints->ai_flags;
if ((iFlags & AI_CANONNAME) && !pszNodeName)
return EAI_BADFLAGS;
// we only support a limited number of protocol families.
iFamily = ptHints->ai_family;
if ((iFamily != PF_UNSPEC) && (iFamily != PF_INET))
return EAI_FAMILY;
// we only support only these socket types.
iSocketType = ptHints->ai_socktype;
if ((iSocketType != 0) &&
(iSocketType != SOCK_STREAM) &&
(iSocketType != SOCK_DGRAM) &&
(iSocketType != SOCK_RAW))
return EAI_SOCKTYPE;
// REVIEW: What if ai_socktype and ai_protocol are at odds?
iProtocol = ptHints->ai_protocol;
}
////////////////////////////////////////
// do service lookup...
if (pszServiceName)
{
wPort = (WORD) strtoul(pszServiceName, &pc, 10);
if (*pc == '\0') // numeric port string
{
wPort = wTcpPort = wUdpPort = htons(wPort);
if (iSocketType == 0)
{
bClone = TRUE;
iSocketType = SOCK_STREAM;
}
}
else // non numeric port string
{
if ((iSocketType == 0) || (iSocketType == SOCK_DGRAM))
{
ptService = getservbyname(pszServiceName, "udp");
if (ptService)
wPort = wUdpPort = ptService->s_port;
}
if ((iSocketType == 0) || (iSocketType == SOCK_STREAM))
{
ptService = getservbyname(pszServiceName, "tcp");
if (ptService)
wPort = wTcpPort = ptService->s_port;
}
// assumes 0 is an invalid service port...
if (wPort == 0) // no service exists
return (iSocketType ? EAI_SERVICE : EAI_NONAME);
if (iSocketType == 0)
{
// if both tcp and udp, process tcp now & clone udp later.
iSocketType = (wTcpPort) ? SOCK_STREAM : SOCK_DGRAM;
bClone = (wTcpPort && wUdpPort);
}
}
}
////////////////////////////////////////
// do node name lookup...
// if we weren't given a node name,
// return the wildcard or loopback address (depending on AI_PASSIVE).
//
// if we have a numeric host address string,
// return the binary address.
//
if ((!pszNodeName) || (WspiapiParseV4Address(pszNodeName, &dwAddress)))
{
if (!pszNodeName)
{
dwAddress = htonl((iFlags & AI_PASSIVE)
? INADDR_ANY
: INADDR_LOOPBACK);
}
// create an addrinfo structure...
*pptResult =
WspiapiNewAddrInfo(iSocketType, iProtocol, wPort, dwAddress);
if (!(*pptResult))
iError = EAI_MEMORY;
if (!iError && pszNodeName)
{
// implementation specific behavior: set AI_NUMERICHOST
// to indicate that we got a numeric host address string.
(*pptResult)->ai_flags |= AI_NUMERICHOST;
// return the numeric address string as the canonical name
if (iFlags & AI_CANONNAME)
{
(*pptResult)->ai_canonname =
WspiapiStrdup(inet_ntoa(*((struct in_addr *) &dwAddress)));
if (!(*pptResult)->ai_canonname)
iError = EAI_MEMORY;
}
}
}
// if we do not have a numeric host address string and
// AI_NUMERICHOST flag is set, return an error!
else if (iFlags & AI_NUMERICHOST)
{
iError = EAI_NONAME;
}
// since we have a non-numeric node name,
// we have to do a regular node name lookup.
else
{
iError = WspiapiLookupNode(pszNodeName,
iSocketType,
iProtocol,
wPort,
(iFlags & AI_CANONNAME),
pptResult);
}
if (!iError && bClone)
{
iError = WspiapiClone(wUdpPort, *pptResult);
}
if (iError)
{
WspiapiLegacyFreeAddrInfo(*pptResult);
*pptResult = NULL;
}
return (iError);
}
__inline
int
WINAPI
WspiapiLegacyGetNameInfo(
IN const struct sockaddr *ptSocketAddress,
IN socklen_t tSocketLength,
OUT char *pszNodeName,
IN size_t tNodeLength,
OUT char *pszServiceName,
IN size_t tServiceLength,
IN int iFlags)
/*++
Routine Description
protocol-independent address-to-name translation.
as specified in RFC 2553, Section 6.5.
this is the hacked version that only supports IPv4.
Arguments
ptSocketAddress socket address to translate.
tSocketLength length of above socket address.
pszNodeName where to return the node name.
tNodeLength size of above buffer.
pszServiceName where to return the service name.
tServiceLength size of above buffer.
iFlags flags of type NI_*.
Return Value
returns zero if successful, an EAI_* error code if not.
--*/
{
struct servent *ptService;
WORD wPort;
char szBuffer[] = "65535";
char *pszService = szBuffer;
struct hostent *ptHost;
struct in_addr tAddress;
char *pszNode = NULL;
char *pc = NULL;
// sanity check ptSocketAddress and tSocketLength.
if (!ptSocketAddress)
return EAI_FAIL;
if ((ptSocketAddress->sa_family != AF_INET) ||
(tSocketLength != sizeof(struct sockaddr_in)))
{
return EAI_FAMILY;
}
if (!(pszNodeName && tNodeLength) &&
!(pszServiceName && tServiceLength))
{
return EAI_NONAME;
}
// the draft has the "bad flags" error code, so presumably we
// should check something here. insisting that there aren't
// any unspecified flags set would break forward compatibility,
// however. so we just check for non-sensical combinations.
if ((iFlags & NI_NUMERICHOST) && (iFlags & NI_NAMEREQD))
{
return EAI_BADFLAGS;
}
// translate the port to a service name (if requested).
if (pszServiceName && tServiceLength)
{
wPort = ((struct sockaddr_in *) ptSocketAddress)->sin_port;
if (iFlags & NI_NUMERICSERV)
{
// return numeric form of the address.
sprintf(szBuffer, "%u", ntohs(wPort));
}
else
{
// return service name corresponding to port.
ptService = getservbyport(wPort,
(iFlags & NI_DGRAM) ? "udp" : NULL);
if (ptService && ptService->s_name)
{
// lookup successful.
pszService = ptService->s_name;
}
else
{
// DRAFT: return numeric form of the port!
sprintf(szBuffer, "%u", ntohs(wPort));
}
}
if (tServiceLength > strlen(pszService))
strcpy(pszServiceName, pszService);
else
return EAI_FAIL;
}
// translate the address to a node name (if requested).
if (pszNodeName && tNodeLength)
{
// this is the IPv4-only version, so we have an IPv4 address.
tAddress = ((struct sockaddr_in *) ptSocketAddress)->sin_addr;
if (iFlags & NI_NUMERICHOST)
{
// return numeric form of the address.
pszNode = inet_ntoa(tAddress);
}
else
{
// return node name corresponding to address.
ptHost = gethostbyaddr((char *) &tAddress,
sizeof(struct in_addr),
AF_INET);
if (ptHost && ptHost->h_name)
{
// DNS lookup successful.
// stop copying at a "." if NI_NOFQDN is specified.
pszNode = ptHost->h_name;
if ((iFlags & NI_NOFQDN) && (pc = strchr(pszNode, '.')))
*pc = '\0';
}
else
{
// DNS lookup failed. return numeric form of the address.
if (iFlags & NI_NAMEREQD)
{
switch (WSAGetLastError())
{
case WSAHOST_NOT_FOUND: return EAI_NONAME;
case WSATRY_AGAIN: return EAI_AGAIN;
case WSANO_RECOVERY: return EAI_FAIL;
default: return EAI_NONAME;
}
}
else
pszNode = inet_ntoa(tAddress);
}
}
if (tNodeLength > strlen(pszNode))
strcpy(pszNodeName, pszNode);
else
return EAI_FAIL;
}
return 0;
}
typedef struct
{
char const *pszName;
FARPROC pfAddress;
} WSPIAPI_FUNCTION;
#define WSPIAPI_FUNCTION_ARRAY \
{ \
"getaddrinfo", (FARPROC) WspiapiLegacyGetAddrInfo, \
"getnameinfo", (FARPROC) WspiapiLegacyGetNameInfo, \
"freeaddrinfo", (FARPROC) WspiapiLegacyFreeAddrInfo, \
}
__inline
FARPROC
WINAPI
WspiapiLoad(
IN WORD wFunction)
/*++
Routine Description
try to locate the address family independent name resolution routines
(i.e. getaddrinfo, getnameinfo, freeaddrinfo, gai_strerror).
Locks
this function call is not synchronized. hence the library containing
the routines might be loaded multiple times. another option is to
synchronize through a spin lock using a static local variable and the
InterlockedExchange operation.
Arguments
wFunction ordinal # of the function to get the pointer to
0 getaddrinfo
1 getnameinfo
2 freeaddrinfo
Return Value
address of the library/legacy routine
--*/
{
HMODULE hLibrary = NULL;
// these static variables store state across calls, across threads.
static BOOL bInitialized = FALSE;
static WSPIAPI_FUNCTION rgtGlobal[] = WSPIAPI_FUNCTION_ARRAY;
static const int iNumGlobal = (sizeof(rgtGlobal) /
sizeof(WSPIAPI_FUNCTION));
// we overwrite rgtGlobal only if all routines exist in library.
WSPIAPI_FUNCTION rgtLocal[] = WSPIAPI_FUNCTION_ARRAY;
FARPROC fScratch = NULL;
int i = 0;
if (bInitialized) // WspiapiLoad has already been called once
return (rgtGlobal[wFunction].pfAddress);
do // breakout loop
{
CHAR SystemDir[MAX_PATH + 1];
CHAR Path[MAX_PATH + 8];
if (GetSystemDirectoryA(SystemDir, MAX_PATH) == 0)
{
break;
}
// in Whistler and beyond...
// the routines are present in the WinSock 2 library (ws2_32.dll).
// printf("Looking in ws2_32 for getaddrinfo...\n");
strcpy(Path, SystemDir);
strcat(Path, "\\ws2_32");
hLibrary = LoadLibraryA(Path);
if (hLibrary != NULL)
{
fScratch = GetProcAddress(hLibrary, "getaddrinfo");
if (fScratch == NULL)
{
FreeLibrary(hLibrary);
hLibrary = NULL;
}
}
if (hLibrary != NULL)
break;
// in the IPv6 Technology Preview...
// the routines are present in the IPv6 WinSock library (wship6.dll).
// printf("Looking in wship6 for getaddrinfo...\n");
strcpy(Path, SystemDir);
strcat(Path, "\\wship6");
hLibrary = LoadLibraryA(Path);
if (hLibrary != NULL)
{
fScratch = GetProcAddress(hLibrary, "getaddrinfo");
if (fScratch == NULL)
{
FreeLibrary(hLibrary);
hLibrary = NULL;
}
}
} while (FALSE);
if (hLibrary != NULL)
{
// use routines from this library...
// since getaddrinfo is here, we expect all routines to be here,
// but will fall back to IPv4-only if any of them is missing.
for (i = 0; i < iNumGlobal; i++)
{
rgtLocal[i].pfAddress
= GetProcAddress(hLibrary, rgtLocal[i].pszName);
if (rgtLocal[i].pfAddress == NULL)
{
FreeLibrary(hLibrary);
hLibrary = NULL;
break;
}
}
if (hLibrary != NULL)
{
// printf("found!\n");
for (i = 0; i < iNumGlobal; i++)
rgtGlobal[i].pfAddress = rgtLocal[i].pfAddress;
}
}
bInitialized = TRUE;
return (rgtGlobal[wFunction].pfAddress);
}
__inline
int
WINAPI
WspiapiGetAddrInfo(
IN const char *nodename,
IN const char *servname,
IN const struct addrinfo *hints,
OUT struct addrinfo **res)
{
static WSPIAPI_PGETADDRINFO pfGetAddrInfo = NULL;
if (!pfGetAddrInfo)
pfGetAddrInfo = (WSPIAPI_PGETADDRINFO) WspiapiLoad(0);
return ((*pfGetAddrInfo)
(nodename, servname, hints, res));
}
__inline
int
WINAPI
WspiapiGetNameInfo (
IN const struct sockaddr *sa,
IN socklen_t salen,
OUT char *host,
IN size_t hostlen,
OUT char *serv,
IN size_t servlen,
IN int flags)
{
static WSPIAPI_PGETNAMEINFO pfGetNameInfo = NULL;
if (!pfGetNameInfo)
pfGetNameInfo = (WSPIAPI_PGETNAMEINFO) WspiapiLoad(1);
return ((*pfGetNameInfo)
(sa, salen, host, hostlen, serv, servlen, flags));
}
__inline
void
WINAPI
WspiapiFreeAddrInfo (
IN struct addrinfo *ai)
{
static WSPIAPI_PFREEADDRINFO pfFreeAddrInfo = NULL;
if (!pfFreeAddrInfo)
pfFreeAddrInfo = (WSPIAPI_PFREEADDRINFO) WspiapiLoad(2);
(*pfFreeAddrInfo)(ai);
}
#ifdef __cplusplus
}
#endif
#endif // _WSPIAPI_H_
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