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/*-------------------------------------------------------------------------
*
* getaddrinfo.c
* Support getaddrinfo() on platforms that don't have it.
*
*
* Copyright (c) 2003, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/port/getaddrinfo.c,v 1.3 2003/04/27 23:56:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
/* 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"
int
getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints,
struct addrinfo **res)
{
struct addrinfo *ai;
struct sockaddr_in sin, *psin;
if (!hints ||
(hints->ai_family != AF_INET && hints->ai_family != AF_UNSPEC))
return EAI_FAMILY;
if (hints->ai_socktype != SOCK_STREAM)
return EAI_SOCKTYPE;
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)
{
inet_aton(node, &sin.sin_addr);
}
else
{
struct hostent *hp;
hp = gethostbyname(node);
if (hp == NULL)
{
switch (h_errno)
{
case HOST_NOT_FOUND:
return EAI_NONAME;
case NO_DATA:
return EAI_NODATA;
case TRY_AGAIN:
return EAI_AGAIN;
case NO_RECOVERY:
default:
return EAI_FAIL;
}
}
if (hp->h_addrtype != AF_INET)
return EAI_ADDRFAMILY;
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));
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_family = AF_INET;
ai->ai_socktype = SOCK_STREAM;
ai->ai_protocol = IPPROTO_TCP;
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)
{
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_NODATA:
hcode = NO_DATA;
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_NODATA:
return "No address associated with name";
case EAI_AGAIN:
return "Host name lookup failure";
case EAI_FAIL:
default:
return "Unknown server error";
}
#endif /* HAVE_HSTRERROR */
}
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