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Commitc3bf8de

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committed
Add code to use Windows getaddrinfo and friends if they exist. This
has to be tested dynamically if we want to make portable executables.Chuck McDevitt and Andrew Dunstan.
1 parentbd19ee3 commitc3bf8de

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1 file changed

+133
-2
lines changed

1 file changed

+133
-2
lines changed

‎src/port/getaddrinfo.c‎

Lines changed: 133 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,11 +8,15 @@
88
* platform, we'll need to split this file and provide a separate configure
99
* test for getnameinfo().
1010
*
11+
* Windows may or may not have these routines, so we handle Windows special
12+
* by dynamically checking for their existence. If they already exist, we
13+
* use the Windows native routines, but if not, we use our own.
14+
*
1115
*
1216
* Copyright (c) 2003-2005, PostgreSQL Global Development Group
1317
*
1418
* IDENTIFICATION
15-
* $PostgreSQL: pgsql/src/port/getaddrinfo.c,v 1.17 2005/07/28 04:03:14 tgl Exp $
19+
* $PostgreSQL: pgsql/src/port/getaddrinfo.c,v 1.18 2005/08/24 22:13:23 tgl Exp $
1620
*
1721
*-------------------------------------------------------------------------
1822
*/
@@ -29,6 +33,103 @@
2933

3034
#include"getaddrinfo.h"
3135

36+
37+
#ifdefWIN32
38+
39+
#defineWIN32_LEAN_AND_MEAN
40+
41+
#include<windows.h>
42+
43+
/*
44+
* The native routines may or may not exist on the Windows platform we are on,
45+
* so we dynamically look up the routines, and call them via function pointers.
46+
* Here we need to declare what the function pointers look like
47+
*/
48+
typedefint (__stdcall*getaddrinfo_ptr_t) (constchar*nodename,
49+
constchar*servname,
50+
conststructaddrinfo*hints,
51+
structaddrinfo**res);
52+
53+
typedefvoid (__stdcall*freeaddrinfo_ptr_t) (structaddrinfo*ai);
54+
55+
typedefint (__stdcall*getnameinfo_ptr_t) (conststructsockaddr*sa,
56+
intsalen,
57+
char*host,inthostlen,
58+
char*serv,intservlen,
59+
intflags);
60+
61+
/* static pointers to the native routines, so we only do the lookup once. */
62+
staticgetaddrinfo_ptr_tgetaddrinfo_ptr=NULL;
63+
staticfreeaddrinfo_ptr_tfreeaddrinfo_ptr=NULL;
64+
staticgetnameinfo_ptr_tgetnameinfo_ptr=NULL;
65+
66+
67+
staticbool
68+
haveNativeWindowsIPv6routines(void)
69+
{
70+
void*hLibrary=NULL;
71+
staticboolalreadyLookedForIpv6routines= FALSE;
72+
73+
if (alreadyLookedForIpv6routines)
74+
return (getaddrinfo_ptr!=NULL);
75+
76+
/*
77+
* For Windows XP and Windows 2003 (and longhorn/vista), the IPv6
78+
* routines are present in the WinSock 2 library (ws2_32.dll).
79+
* Try that first
80+
*/
81+
82+
hLibrary=LoadLibraryA("ws2_32");
83+
84+
if (hLibrary==NULL||GetProcAddress(hLibrary,"getaddrinfo")==NULL)
85+
{
86+
/*
87+
* Well, ws2_32 doesn't exist, or more likely doesn't have
88+
* getaddrinfo.
89+
*/
90+
if (hLibrary!=NULL)
91+
FreeLibrary(hLibrary);
92+
93+
/*
94+
* In Windows 2000, there was only the IPv6 Technology Preview look in
95+
* the IPv6 WinSock library (wship6.dll).
96+
*/
97+
98+
hLibrary=LoadLibraryA("wship6");
99+
}
100+
101+
/* If hLibrary is null, we couldn't find a dll with functions */
102+
if (hLibrary!=NULL)
103+
{
104+
/* We found a dll, so now get the addresses of the routines */
105+
106+
getaddrinfo_ptr=GetProcAddress(hLibrary,"getaddrinfo");
107+
freeaddrinfo_ptr=GetProcAddress(hLibrary,"freeaddrinfo");
108+
getnameinfo_ptr=GetProcAddress(hLibrary,"getnameinfo");
109+
110+
/*
111+
* If any one of the routines is missing, let's play it safe and
112+
* ignore them all
113+
*/
114+
if (getaddrinfo_ptr==NULL||
115+
freeaddrinfo_ptr==NULL||
116+
getnameinfo_ptr==NULL)
117+
{
118+
FreeLibrary(hLibrary);
119+
hLibrary=NULL;
120+
getaddrinfo_ptr=NULL;
121+
freeaddrinfo_ptr=NULL;
122+
getnameinfo_ptr=NULL;
123+
}
124+
}
125+
126+
alreadyLookedForIpv6routines= TRUE;
127+
return (getaddrinfo_ptr!=NULL);
128+
}
129+
130+
#endif
131+
132+
32133
/*
33134
* get address info for ipv4 sockets.
34135
*
@@ -47,6 +148,15 @@ getaddrinfo(const char *node, const char *service,
47148
*psin;
48149
structaddrinfohints;
49150

151+
#ifdefWIN32
152+
/*
153+
* If Windows has native IPv6 support, use the native Windows routine.
154+
* Otherwise, fall through and use our own code.
155+
*/
156+
if (haveNativeWindowsIPv6routines())
157+
return (*getaddrinfo_ptr) (node,service,hintp,res);
158+
#endif
159+
50160
if (hintp==NULL)
51161
{
52162
memset(&hints,0,sizeof(hints));
@@ -160,6 +270,18 @@ freeaddrinfo(struct addrinfo * res)
160270
{
161271
if (res)
162272
{
273+
#ifdefWIN32
274+
/*
275+
* If Windows has native IPv6 support, use the native Windows routine.
276+
* Otherwise, fall through and use our own code.
277+
*/
278+
if (haveNativeWindowsIPv6routines())
279+
{
280+
(*freeaddrinfo_ptr) (node,service,hintp,res);
281+
return;
282+
}
283+
#endif
284+
163285
if (res->ai_addr)
164286
free(res->ai_addr);
165287
free(res);
@@ -188,7 +310,6 @@ gai_strerror(int errcode)
188310
}
189311

190312
returnhstrerror(hcode);
191-
192313
#else/* !HAVE_HSTRERROR */
193314

194315
switch (errcode)
@@ -216,6 +337,16 @@ getnameinfo(const struct sockaddr * sa, int salen,
216337
char*node,intnodelen,
217338
char*service,intservicelen,intflags)
218339
{
340+
#ifdefWIN32
341+
/*
342+
* If Windows has native IPv6 support, use the native Windows routine.
343+
* Otherwise, fall through and use our own code.
344+
*/
345+
if (haveNativeWindowsIPv6routines())
346+
return (*getnameinfo_ptr) (sa,salen,node,nodelen,
347+
service,servicelen,flags);
348+
#endif
349+
219350
/* Invalid arguments. */
220351
if (sa==NULL|| (node==NULL&&service==NULL))
221352
returnEAI_FAIL;

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