177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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* Copyright (c) 1999-2001, 2004, 2010, 2013 Proofpoint, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: sm_gethost.c,v 8.32 2013-11-22 20:51:36 ca Exp $")
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#include <sendmail.h>
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#if NETINET || NETINET6
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# include <arpa/inet.h>
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#endif /* NETINET || NETINET6 */
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#include "libmilter.h"
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/*
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** MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
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**
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** Some operating systems have wierd problems with the gethostbyXXX
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** routines. For example, Solaris versions at least through 2.3
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** don't properly deliver a canonical h_name field. This tries to
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** work around these problems.
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**
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** Support IPv6 as well as IPv4.
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*/
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#if NETINET6 && NEEDSGETIPNODE
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static struct hostent *sm_getipnodebyname __P((const char *, int, int, int *));
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# ifndef AI_ADDRCONFIG
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# define AI_ADDRCONFIG 0 /* dummy */
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# endif /* ! AI_ADDRCONFIG */
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# ifndef AI_ALL
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# define AI_ALL 0 /* dummy */
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# endif /* ! AI_ALL */
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# ifndef AI_DEFAULT
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# define AI_DEFAULT 0 /* dummy */
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# endif /* ! AI_DEFAULT */
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static struct hostent *
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sm_getipnodebyname(name, family, flags, err)
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const char *name;
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int family;
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int flags;
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int *err;
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{
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bool resv6 = true;
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struct hostent *h;
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if (family == AF_INET6)
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{
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/* From RFC2133, section 6.1 */
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resv6 = bitset(RES_USE_INET6, _res.options);
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_res.options |= RES_USE_INET6;
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}
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SM_SET_H_ERRNO(0);
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h = gethostbyname(name);
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if (family == AF_INET6 && !resv6)
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_res.options &= ~RES_USE_INET6;
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/* the function is supposed to return only the requested family */
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if (h != NULL && h->h_addrtype != family)
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{
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# if NETINET6
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freehostent(h);
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# endif /* NETINET6 */
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h = NULL;
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*err = NO_DATA;
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}
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else
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*err = h_errno;
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return h;
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}
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void
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freehostent(h)
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struct hostent *h;
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{
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/*
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** Stub routine -- if they don't have getipnodeby*(),
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** they probably don't have the free routine either.
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*/
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return;
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}
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#else /* NEEDSGETIPNODE && NETINET6 */
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#define sm_getipnodebyname getipnodebyname
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#endif /* NEEDSGETIPNODE && NETINET6 */
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struct hostent *
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mi_gethostbyname(name, family)
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char *name;
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int family;
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{
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struct hostent *h = NULL;
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#if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
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# if SOLARIS == 20300 || SOLARIS == 203
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static struct hostent hp;
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static char buf[1000];
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extern struct hostent *_switch_gethostbyname_r();
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h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
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# else /* SOLARIS == 20300 || SOLARIS == 203 */
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extern struct hostent *__switch_gethostbyname();
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h = __switch_gethostbyname(name);
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# endif /* SOLARIS == 20300 || SOLARIS == 203 */
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#else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
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# if NETINET6
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# ifndef SM_IPNODEBYNAME_FLAGS
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/* For IPv4-mapped addresses, use: AI_DEFAULT|AI_ALL */
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# define SM_IPNODEBYNAME_FLAGS AI_ADDRCONFIG
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# endif /* SM_IPNODEBYNAME_FLAGS */
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int flags = SM_IPNODEBYNAME_FLAGS;
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int err;
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# endif /* NETINET6 */
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# if NETINET6
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# if ADDRCONFIG_IS_BROKEN
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flags &= ~AI_ADDRCONFIG;
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# endif /* ADDRCONFIG_IS_BROKEN */
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h = sm_getipnodebyname(name, family, flags, &err);
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SM_SET_H_ERRNO(err);
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# else /* NETINET6 */
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h = gethostbyname(name);
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# endif /* NETINET6 */
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#endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
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/* the function is supposed to return only the requested family */
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if (h != NULL && h->h_addrtype != family)
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{
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# if NETINET6
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freehostent(h);
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# endif /* NETINET6 */
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h = NULL;
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SM_SET_H_ERRNO(NO_DATA);
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}
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return h;
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}
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#if NETINET6
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/*
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** MI_INET_PTON -- convert printed form to network address.
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**
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** Wrapper for inet_pton() which handles IPv6: labels.
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**
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** Parameters:
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** family -- address family
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** src -- string
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** dst -- destination address structure
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**
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** Returns:
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** 1 if the address was valid
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** 0 if the address wasn't parseable
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** -1 if error
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*/
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int
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mi_inet_pton(family, src, dst)
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int family;
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const char *src;
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void *dst;
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{
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if (family == AF_INET6 &&
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strncasecmp(src, "IPv6:", 5) == 0)
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src += 5;
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return inet_pton(family, src, dst);
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}
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#endif /* NETINET6 */
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