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 */ 149