contrib/sendmail-8.14/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 #include <sm/gen.h>
  12 SM_RCSID("@(#)$Id: sm_gethost.c,v 8.27 2004/08/20 21:12:37 ca Exp $")
  13
  14 #include <sendmail.h>
  15 #if NETINET || NETINET6
  16 # include <arpa/inet.h>
  17 #endif /* NETINET || NETINET6 */
  18 #include "libmilter.h"
  19
  20 /*
  21 **  MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX
  22 **
  23 **      Some operating systems have wierd problems with the gethostbyXXX
  24 **      routines.  For example, Solaris versions at least through 2.3
  25 **      don't properly deliver a canonical h_name field.  This tries to
  26 **      work around these problems.
  27 **
  28 **      Support IPv6 as well as IPv4.
  29 */
  30
  31 #if NETINET6 && NEEDSGETIPNODE
  32
  33 static struct hostent *getipnodebyname __P((char *, int, int, int *));
  34
  35 # ifndef AI_ADDRCONFIG
  36 #  define AI_ADDRCONFIG 0       /* dummy */
  37 # endif /* ! AI_ADDRCONFIG */
  38 # ifndef AI_ALL
  39 #  define AI_ALL        0       /* dummy */
  40 # endif /* ! AI_ALL */
  41 # ifndef AI_DEFAULT
  42 #  define AI_DEFAULT    0       /* dummy */
  43 # endif /* ! AI_DEFAULT */
  44
  45 static struct hostent *
  46 getipnodebyname(name, family, flags, err)
  47         char *name;
  48         int family;
  49         int flags;
  50         int *err;
  51 {
  52         bool resv6 = true;
  53         struct hostent *h;
  54
  55         if (family == AF_INET6)
  56         {
  57                 /* From RFC2133, section 6.1 */
  58                 resv6 = bitset(RES_USE_INET6, _res.options);
  59                 _res.options |= RES_USE_INET6;
  60         }
  61         SM_SET_H_ERRNO(0);
  62         h = gethostbyname(name);
  63         if (family == AF_INET6 && !resv6)
  64                 _res.options &= ~RES_USE_INET6;
  65         *err = h_errno;
  66         return h;
  67 }
  68
  69 void
  70 freehostent(h)
  71         struct hostent *h;
  72 {
  73         /*
  74         **  Stub routine -- if they don't have getipnodeby*(),
  75         **  they probably don't have the free routine either.
  76         */
  77
  78         return;
  79 }
  80 #endif /* NEEDSGETIPNODE && NETINET6 */
  81
  82 struct hostent *
  83 mi_gethostbyname(name, family)
  84         char *name;
  85         int family;
  86 {
  87         struct hostent *h = NULL;
  88 #if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
  89 # if SOLARIS == 20300 || SOLARIS == 203
  90         static struct hostent hp;
  91         static char buf[1000];
  92         extern struct hostent *_switch_gethostbyname_r();
  93
  94         h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
  95 # else /* SOLARIS == 20300 || SOLARIS == 203 */
  96         extern struct hostent *__switch_gethostbyname();
  97
  98         h = __switch_gethostbyname(name);
  99 # endif /* SOLARIS == 20300 || SOLARIS == 203 */
 100 #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
 101 # if NETINET6
 102         int flags = AI_DEFAULT|AI_ALL;
 103         int err;
 104 # endif /* NETINET6 */
 105
 106 # if NETINET6
 107 #  if ADDRCONFIG_IS_BROKEN
 108         flags &= ~AI_ADDRCONFIG;
 109 #  endif /* ADDRCONFIG_IS_BROKEN */
 110         h = getipnodebyname(name, family, flags, &err);
 111         SM_SET_H_ERRNO(err);
 112 # else /* NETINET6 */
 113         h = gethostbyname(name);
 114 # endif /* NETINET6 */
 115
 116 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
 117         return h;
 118 }
 119
 120 #if NETINET6
 121 /*
 122 **  MI_INET_PTON -- convert printed form to network address.
 123 **
 124 **      Wrapper for inet_pton() which handles IPv6: labels.
 125 **
 126 **      Parameters:
 127 **              family -- address family
 128 **              src -- string
 129 **              dst -- destination address structure
 130 **
 131 **      Returns:
 132 **              1 if the address was valid
 133 **              0 if the address wasn't parseable
 134 **              -1 if error
 135 */
 136
 137 int
 138 mi_inet_pton(family, src, dst)
 139         int family;
 140         const char *src;
 141         void *dst;
 142 {
 143         if (family == AF_INET6 &&
 144             strncasecmp(src, "IPv6:", 5) == 0)
 145                 src += 5;
 146         return inet_pton(family, src, dst);
 147 }
 148 #endif /* NETINET6 */