sm_gethost.c revision 66494 
1/*
2 *  Copyright (c) 1999-2000 Sendmail, Inc. and its suppliers.
3 *	All rights reserved.
4 *
5 * By using this file, you agree to the terms and conditions set
6 * forth in the LICENSE file which can be found at the top level of
7 * the sendmail distribution.
8 *
9 */
10
11#ifndef lint
12static char id[] = "@(#)$Id: sm_gethost.c,v 8.7.8.2 2000/09/17 17:04:24 gshapiro Exp $";
13#endif /* ! lint */
14
15#if _FFR_MILTER
16#include <sendmail.h>
17#if NETINET || NETINET6
18# include <arpa/inet.h>
19#endif /* NETINET || NETINET6 */
20
21/*
22**  MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
23**
24**	Some operating systems have wierd problems with the gethostbyXXX
25**	routines.  For example, Solaris versions at least through 2.3
26**	don't properly deliver a canonical h_name field.  This tries to
27**	work around these problems.
28**
29**	Support IPv6 as well as IPv4.
30*/
31
32#if NETINET6 && NEEDSGETIPNODE && __RES < 19990909
33
34# ifndef AI_V4MAPPED
35#  define AI_V4MAPPED	0	/* dummy */
36# endif /* ! AI_V4MAPPED */
37# ifndef AI_ALL
38#  define AI_ALL	0	/* dummy */
39# endif /* ! AI_ALL */
40
41static struct hostent *
42getipnodebyname(name, family, flags, err)
43	char *name;
44	int family;
45	int flags;
46	int *err;
47{
48	bool resv6 = TRUE;
49	struct hostent *h;
50
51	if (family == AF_INET6)
52	{
53		/* From RFC2133, section 6.1 */
54		resv6 = bitset(RES_USE_INET6, _res.options);
55		_res.options |= RES_USE_INET6;
56	}
57	h_errno = 0;
58	h = gethostbyname(name);
59	*err = h_errno;
60	if (family == AF_INET6 && !resv6)
61		_res.options &= ~RES_USE_INET6;
62	return h;
63}
64#endif /* NEEDSGETIPNODE && NETINET6 && __RES < 19990909 */
65
66struct hostent *
67mi_gethostbyname(name, family)
68	char *name;
69	int family;
70{
71	struct hostent *h = NULL;
72#if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
73# if SOLARIS == 20300 || SOLARIS == 203
74	static struct hostent hp;
75	static char buf[1000];
76	extern struct hostent *_switch_gethostbyname_r();
77
78	h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
79# else /* SOLARIS == 20300 || SOLARIS == 203 */
80	extern struct hostent *__switch_gethostbyname();
81
82	h = __switch_gethostbyname(name);
83# endif /* SOLARIS == 20300 || SOLARIS == 203 */
84#else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
85# if NETINET6
86	int err;
87# endif /* NETINET6 */
88
89# if NETINET6
90	h = getipnodebyname(name, family, AI_V4MAPPED|AI_ALL, &err);
91	h_errno = err;
92# else /* NETINET6 */
93	h = gethostbyname(name);
94# endif /* NETINET6 */
95
96#endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
97	return h;
98}
99#endif /* _FFR_MILTER */
100