usr/src/cmd/sendmail/libmilter/sm_gethost.c

   1 /*
   2  *  Copyright (c) 1999-2001, 2004 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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  12
  13 #include <sm/gen.h>
  14 SM_RCSID("@(#)$Id: sm_gethost.c,v 8.27 2004/08/20 21:12:37 ca Exp $")
  15
  16 #include <sendmail.h>
  17 #if NETINET || NETINET6
  18 # include <arpa/inet.h>
  19 #endif /* NETINET || NETINET6 */
  20 #include "libmilter.h"
  21
  22 /*
  23 **  MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
  24 **
  25 **      Some operating systems have wierd problems with the gethostbyXXX
  26 **      routines.  For example, Solaris versions at least through 2.3
  27 **      don't properly deliver a canonical h_name field.  This tries to
  28 **      work around these problems.
  29 **
  30 **      Support IPv6 as well as IPv4.
  31 */
  32
  33 #if NETINET6 && NEEDSGETIPNODE
  34
  35 static struct hostent *getipnodebyname __P((char *, int, int, int *));
  36
  37 # ifndef AI_ADDRCONFIG
  38 #  define AI_ADDRCONFIG 0       /* dummy */
  39 # endif /* ! AI_ADDRCONFIG */
  40 # ifndef AI_ALL
  41 #  define AI_ALL        0       /* dummy */
  42 # endif /* ! AI_ALL */
  43 # ifndef AI_DEFAULT
  44 #  define AI_DEFAULT    0       /* dummy */
  45 # endif /* ! AI_DEFAULT */
  46
  47 static struct hostent *
  48 getipnodebyname(name, family, flags, err)
  49         char *name;
  50         int family;
  51         int flags;
  52         int *err;
  53 {
  54         bool resv6 = true;
  55         struct hostent *h;
  56
  57         if (family == AF_INET6)
  58         {
  59                 /* From RFC2133, section 6.1 */
  60                 resv6 = bitset(RES_USE_INET6, _res.options);
  61                 _res.options |= RES_USE_INET6;
  62         }
  63         SM_SET_H_ERRNO(0);
  64         h = gethostbyname(name);
  65         if (family == AF_INET6 && !resv6)
  66                 _res.options &= ~RES_USE_INET6;
  67         *err = h_errno;
  68         return h;
  69 }
  70
  71 void
  72 freehostent(h)
  73         struct hostent *h;
  74 {
  75         /*
  76         **  Stub routine -- if they don't have getipnodeby*(),
  77         **  they probably don't have the free routine either.
  78         */
  79
  80         return;
  81 }
  82 #endif /* NEEDSGETIPNODE && NETINET6 */
  83
  84 struct hostent *
  85 mi_gethostbyname(name, family)
  86         char *name;
  87         int family;
  88 {
  89         struct hostent *h = NULL;
  90 #if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
  91 # if SOLARIS == 20300 || SOLARIS == 203
  92         static struct hostent hp;
  93         static char buf[1000];
  94         extern struct hostent *_switch_gethostbyname_r();
  95
  96         h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
  97 # else /* SOLARIS == 20300 || SOLARIS == 203 */
  98         extern struct hostent *__switch_gethostbyname();
  99
 100         h = __switch_gethostbyname(name);
 101 # endif /* SOLARIS == 20300 || SOLARIS == 203 */
 102 #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
 103 # if NETINET6
 104         int flags = AI_DEFAULT|AI_ALL;
 105         int err;
 106 # endif /* NETINET6 */
 107
 108 # if NETINET6
 109 #  if ADDRCONFIG_IS_BROKEN
 110         flags &= ~AI_ADDRCONFIG;
 111 #  endif /* ADDRCONFIG_IS_BROKEN */
 112         h = getipnodebyname(name, family, flags, &err);
 113         SM_SET_H_ERRNO(err);
 114 # else /* NETINET6 */
 115         h = gethostbyname(name);
 116 # endif /* NETINET6 */
 117
 118 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
 119         return h;
 120 }
 121
 122 #if NETINET6
 123 /*
 124 **  MI_INET_PTON -- convert printed form to network address.
 125 **
 126 **      Wrapper for inet_pton() which handles IPv6: labels.
 127 **
 128 **      Parameters:
 129 **              family -- address family
 130 **              src -- string
 131 **              dst -- destination address structure
 132 **
 133 **      Returns:
 134 **              1 if the address was valid
 135 **              0 if the address wasn't parseable
 136 **              -1 if error
 137 */
 138
 139 int
 140 mi_inet_pton(family, src, dst)
 141         int family;
 142         const char *src;
 143         void *dst;
 144 {
 145         if (family == AF_INET6 &&
 146             strncasecmp(src, "IPv6:", 5) == 0)
 147                 src += 5;
 148         return inet_pton(family, src, dst);
 149 }
 150 #endif /* NETINET6 */