contrib/sendmail/libmilter/sm_gethost.c

   1 /*
   2  *  Copyright (c) 1999-2001 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 #include <sm/gen.h>
  12 SM_RCSID("@(#)$Id: sm_gethost.c,v 8.26 2001/09/11 04:04:45 gshapiro Exp $")
  13
  14 #include <sendmail.h>
  15 #if NETINET || NETINET6
  16 # include <arpa/inet.h>
  17 #endif /* NETINET || NETINET6 */
  18
  19 /*
  20 **  MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
  21 **
  22 **      Some operating systems have wierd problems with the gethostbyXXX
  23 **      routines.  For example, Solaris versions at least through 2.3
  24 **      don't properly deliver a canonical h_name field.  This tries to
  25 **      work around these problems.
  26 **
  27 **      Support IPv6 as well as IPv4.
  28 */
  29
  30 #if NETINET6 && NEEDSGETIPNODE
  31
  32 # ifndef AI_ADDRCONFIG
  33 #  define AI_ADDRCONFIG 0       /* dummy */
  34 # endif /* ! AI_ADDRCONFIG */
  35 # ifndef AI_ALL
  36 #  define AI_ALL        0       /* dummy */
  37 # endif /* ! AI_ALL */
  38 # ifndef AI_DEFAULT
  39 #  define AI_DEFAULT    0       /* dummy */
  40 # endif /* ! AI_DEFAULT */
  41
  42 static struct hostent *
  43 getipnodebyname(name, family, flags, err)
  44         char *name;
  45         int family;
  46         int flags;
  47         int *err;
  48 {
  49         bool resv6 = true;
  50         struct hostent *h;
  51
  52         if (family == AF_INET6)
  53         {
  54                 /* From RFC2133, section 6.1 */
  55                 resv6 = bitset(RES_USE_INET6, _res.options);
  56                 _res.options |= RES_USE_INET6;
  57         }
  58         SM_SET_H_ERRNO(0);
  59         h = gethostbyname(name);
  60         if (family == AF_INET6 && !resv6)
  61                 _res.options &= ~RES_USE_INET6;
  62         *err = h_errno;
  63         return h;
  64 }
  65
  66 void
  67 freehostent(h)
  68         struct hostent *h;
  69 {
  70         /*
  71         **  Stub routine -- if they don't have getipnodeby*(),
  72         **  they probably don't have the free routine either.
  73         */
  74
  75         return;
  76 }
  77 #endif /* NEEDSGETIPNODE && NETINET6 */
  78
  79 struct hostent *
  80 mi_gethostbyname(name, family)
  81         char *name;
  82         int family;
  83 {
  84         struct hostent *h = NULL;
  85 #if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
  86 # if SOLARIS == 20300 || SOLARIS == 203
  87         static struct hostent hp;
  88         static char buf[1000];
  89         extern struct hostent *_switch_gethostbyname_r();
  90
  91         h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
  92 # else /* SOLARIS == 20300 || SOLARIS == 203 */
  93         extern struct hostent *__switch_gethostbyname();
  94
  95         h = __switch_gethostbyname(name);
  96 # endif /* SOLARIS == 20300 || SOLARIS == 203 */
  97 #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
  98 # if NETINET6
  99         int flags = AI_DEFAULT|AI_ALL;
 100         int err;
 101 # endif /* NETINET6 */
 102
 103 # if NETINET6
 104 #  if ADDRCONFIG_IS_BROKEN
 105         flags &= ~AI_ADDRCONFIG;
 106 #  endif /* ADDRCONFIG_IS_BROKEN */
 107         h = getipnodebyname(name, family, flags, &err);
 108         SM_SET_H_ERRNO(err);
 109 # else /* NETINET6 */
 110         h = gethostbyname(name);
 111 # endif /* NETINET6 */
 112
 113 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
 114         return h;
 115 }
 116
 117 #if NETINET6
 118 /*
 119 **  MI_INET_PTON -- convert printed form to network address.
 120 **
 121 **      Wrapper for inet_pton() which handles IPv6: labels.
 122 **
 123 **      Parameters:
 124 **              family -- address family
 125 **              src -- string
 126 **              dst -- destination address structure
 127 **
 128 **      Returns:
 129 **              1 if the address was valid
 130 **              0 if the address wasn't parseable
 131 **              -1 if error
 132 */
 133
 134 int
 135 mi_inet_pton(family, src, dst)
 136         int family;
 137         const char *src;
 138         void *dst;
 139 {
 140         if (family == AF_INET6 &&
 141             strncasecmp(src, "IPv6:", 5) == 0)
 142                 src += 5;
 143         return inet_pton(family, src, dst);
 144 }
 145 #endif /* NETINET6 */