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/*-------------------------------------------------------------------------
*
* getaddrinfo.c
* Support getaddrinfo() on platforms that don't have it.
*
* We also supply getnameinfo() here, assuming that the platform will have
* it if and only if it has getaddrinfo(). If this proves false on some
* platform, we'll need to split this file and provide a separate configure
* test for getnameinfo().
*
* Windows may or may not have these routines, so we handle Windows specially
* by dynamically checking for their existence. If they already exist, we
* use the Windows native routines, but if not, we use our own.
*
*
* Copyright (c) 2003-2016, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/getaddrinfo.c
*
*-------------------------------------------------------------------------
*/
/* This is intended to be used in both frontend and backend, so use c.h */
#include "c.h"
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "getaddrinfo.h"
#include "libpq/pqcomm.h" /* needed for struct sockaddr_storage */
#ifdef WIN32
/*
* The native routines may or may not exist on the Windows platform we are on,
* so we dynamically look up the routines, and call them via function pointers.
* Here we need to declare what the function pointers look like
*/
typedef int (__stdcall * getaddrinfo_ptr_t) (const char *nodename,
const char *servname,
const struct addrinfo * hints,
struct addrinfo ** res);
typedef void (__stdcall * freeaddrinfo_ptr_t) (struct addrinfo * ai);
typedef int (__stdcall * getnameinfo_ptr_t) (const struct sockaddr * sa,
int salen,
char *host, int hostlen,
char *serv, int servlen,
int flags);
/* static pointers to the native routines, so we only do the lookup once. */
static getaddrinfo_ptr_t getaddrinfo_ptr = NULL;
static freeaddrinfo_ptr_t freeaddrinfo_ptr = NULL;
static getnameinfo_ptr_t getnameinfo_ptr = NULL;
static bool
haveNativeWindowsIPv6routines(void)
{
void *hLibrary = NULL;
static bool alreadyLookedForIpv6routines = false;
if (alreadyLookedForIpv6routines)
return (getaddrinfo_ptr != NULL);
/*
* For Windows XP and Windows 2003 (and longhorn/vista), the IPv6 routines
* are present in the WinSock 2 library (ws2_32.dll). Try that first
*/
hLibrary = LoadLibraryA("ws2_32");
if (hLibrary == NULL || GetProcAddress(hLibrary, "getaddrinfo") == NULL)
{
/*
* Well, ws2_32 doesn't exist, or more likely doesn't have
* getaddrinfo.
*/
if (hLibrary != NULL)
FreeLibrary(hLibrary);
/*
* In Windows 2000, there was only the IPv6 Technology Preview look in
* the IPv6 WinSock library (wship6.dll).
*/
hLibrary = LoadLibraryA("wship6");
}
/* If hLibrary is null, we couldn't find a dll with functions */
if (hLibrary != NULL)
{
/* We found a dll, so now get the addresses of the routines */
getaddrinfo_ptr = (getaddrinfo_ptr_t) GetProcAddress(hLibrary,
"getaddrinfo");
freeaddrinfo_ptr = (freeaddrinfo_ptr_t) GetProcAddress(hLibrary,
"freeaddrinfo");
getnameinfo_ptr = (getnameinfo_ptr_t) GetProcAddress(hLibrary,
"getnameinfo");
/*
* If any one of the routines is missing, let's play it safe and
* ignore them all
*/
if (getaddrinfo_ptr == NULL ||
freeaddrinfo_ptr == NULL ||
getnameinfo_ptr == NULL)
{
FreeLibrary(hLibrary);
hLibrary = NULL;
getaddrinfo_ptr = NULL;
freeaddrinfo_ptr = NULL;
getnameinfo_ptr = NULL;
}
}
alreadyLookedForIpv6routines = true;
return (getaddrinfo_ptr != NULL);
}
#endif
/*
* get address info for ipv4 sockets.
*
* Bugs: - only one addrinfo is set even though hintp is NULL or
* ai_socktype is 0
* - AI_CANONNAME is not supported.
* - servname can only be a number, not text.
*/
int
getaddrinfo(const char *node, const char *service,
const struct addrinfo * hintp,
struct addrinfo ** res)
{
struct addrinfo *ai;
struct sockaddr_in sin,
*psin;
struct addrinfo hints;
#ifdef WIN32
/*
* If Windows has native IPv6 support, use the native Windows routine.
* Otherwise, fall through and use our own code.
*/
if (haveNativeWindowsIPv6routines())
return (*getaddrinfo_ptr) (node, service, hintp, res);
#endif
if (hintp == NULL)
{
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
}
else
memcpy(&hints, hintp, sizeof(hints));
if (hints.ai_family != AF_INET && hints.ai_family != AF_UNSPEC)
return EAI_FAMILY;
if (hints.ai_socktype == 0)
hints.ai_socktype = SOCK_STREAM;
if (!node && !service)
return EAI_NONAME;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
if (node)
{
if (node[0] == '\0')
sin.sin_addr.s_addr = htonl(INADDR_ANY);
else if (hints.ai_flags & AI_NUMERICHOST)
{
if (!inet_aton(node, &sin.sin_addr))
return EAI_NONAME;
}
else
{
struct hostent *hp;
#ifdef FRONTEND
struct hostent hpstr;
char buf[BUFSIZ];
int herrno = 0;
pqGethostbyname(node, &hpstr, buf, sizeof(buf),
&hp, &herrno);
#else
hp = gethostbyname(node);
#endif
if (hp == NULL)
{
switch (h_errno)
{
case HOST_NOT_FOUND:
case NO_DATA:
return EAI_NONAME;
case TRY_AGAIN:
return EAI_AGAIN;
case NO_RECOVERY:
default:
return EAI_FAIL;
}
}
if (hp->h_addrtype != AF_INET)
return EAI_FAIL;
memcpy(&(sin.sin_addr), hp->h_addr, hp->h_length);
}
}
else
{
if (hints.ai_flags & AI_PASSIVE)
sin.sin_addr.s_addr = htonl(INADDR_ANY);
else
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
if (service)
sin.sin_port = htons((unsigned short) atoi(service));
#ifdef HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN
sin.sin_len = sizeof(sin);
#endif
ai = malloc(sizeof(*ai));
if (!ai)
return EAI_MEMORY;
psin = malloc(sizeof(*psin));
if (!psin)
{
free(ai);
return EAI_MEMORY;
}
memcpy(psin, &sin, sizeof(*psin));
ai->ai_flags = 0;
ai->ai_family = AF_INET;
ai->ai_socktype = hints.ai_socktype;
ai->ai_protocol = hints.ai_protocol;
ai->ai_addrlen = sizeof(*psin);
ai->ai_addr = (struct sockaddr *) psin;
ai->ai_canonname = NULL;
ai->ai_next = NULL;
*res = ai;
return 0;
}
void
freeaddrinfo(struct addrinfo * res)
{
if (res)
{
#ifdef WIN32
/*
* If Windows has native IPv6 support, use the native Windows routine.
* Otherwise, fall through and use our own code.
*/
if (haveNativeWindowsIPv6routines())
{
(*freeaddrinfo_ptr) (res);
return;
}
#endif
if (res->ai_addr)
free(res->ai_addr);
free(res);
}
}
const char *
gai_strerror(int errcode)
{
#ifdef HAVE_HSTRERROR
int hcode;
switch (errcode)
{
case EAI_NONAME:
hcode = HOST_NOT_FOUND;
break;
case EAI_AGAIN:
hcode = TRY_AGAIN;
break;
case EAI_FAIL:
default:
hcode = NO_RECOVERY;
break;
}
return hstrerror(hcode);
#else /* !HAVE_HSTRERROR */
switch (errcode)
{
case EAI_NONAME:
return "Unknown host";
case EAI_AGAIN:
return "Host name lookup failure";
/* Errors below are probably WIN32 only */
#ifdef EAI_BADFLAGS
case EAI_BADFLAGS:
return "Invalid argument";
#endif
#ifdef EAI_FAMILY
case EAI_FAMILY:
return "Address family not supported";
#endif
#ifdef EAI_MEMORY
case EAI_MEMORY:
return "Not enough memory";
#endif
#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME /* MSVC/WIN64 duplicate */
case EAI_NODATA:
return "No host data of that type was found";
#endif
#ifdef EAI_SERVICE
case EAI_SERVICE:
return "Class type not found";
#endif
#ifdef EAI_SOCKTYPE
case EAI_SOCKTYPE:
return "Socket type not supported";
#endif
default:
return "Unknown server error";
}
#endif /* HAVE_HSTRERROR */
}
/*
* Convert an ipv4 address to a hostname.
*
* Bugs: - Only supports NI_NUMERICHOST and NI_NUMERICSERV behavior.
* It will never resolve a hostname.
* - No IPv6 support.
*/
int
getnameinfo(const struct sockaddr * sa, int salen,
char *node, int nodelen,
char *service, int servicelen, int flags)
{
#ifdef WIN32
/*
* If Windows has native IPv6 support, use the native Windows routine.
* Otherwise, fall through and use our own code.
*/
if (haveNativeWindowsIPv6routines())
return (*getnameinfo_ptr) (sa, salen, node, nodelen,
service, servicelen, flags);
#endif
/* Invalid arguments. */
if (sa == NULL || (node == NULL && service == NULL))
return EAI_FAIL;
#ifdef HAVE_IPV6
if (sa->sa_family == AF_INET6)
return EAI_FAMILY;
#endif
/* Unsupported flags. */
if (flags & NI_NAMEREQD)
return EAI_AGAIN;
if (node)
{
if (sa->sa_family == AF_INET)
{
if (inet_net_ntop(AF_INET, &((struct sockaddr_in *) sa)->sin_addr,
sa->sa_family == AF_INET ? 32 : 128,
node, nodelen) == NULL)
return EAI_MEMORY;
}
else
return EAI_MEMORY;
}
if (service)
{
int ret = -1;
if (sa->sa_family == AF_INET)
{
ret = snprintf(service, servicelen, "%d",
ntohs(((struct sockaddr_in *) sa)->sin_port));
}
if (ret == -1 || ret >= servicelen)
return EAI_MEMORY;
}
return 0;
}
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