1 /* 2 * Copyright (c) 1999-2001, 2004, 2010, 2013 Proofpoint, 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 8.32 2013-11-22 20:51:36 ca Exp $") 13 14 #include <sendmail.h> 15 #if NETINET || NETINET6 16 # include <arpa/inet.h> 17 #endif 18 #include "libmilter.h" 19 20 /* 21 ** MI_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX 22 ** 23 ** Some operating systems have weird 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 *sm_getipnodebyname __P((const char *, int, int, int *)); 34 35 # ifndef AI_ADDRCONFIG 36 # define AI_ADDRCONFIG 0 /* dummy */ 37 # endif 38 # ifndef AI_ALL 39 # define AI_ALL 0 /* dummy */ 40 # endif 41 # ifndef AI_DEFAULT 42 # define AI_DEFAULT 0 /* dummy */ 43 # endif 44 45 static struct hostent * 46 sm_getipnodebyname(name, family, flags, err) 47 const char *name; 48 int family; 49 int flags; 50 int *err; 51 { 52 struct hostent *h; 53 # if HAS_GETHOSTBYNAME2 54 55 h = gethostbyname2(name, family); 56 if (h == NULL) 57 *err = h_errno; 58 return h; 59 60 # else /* HAS_GETHOSTBYNAME2 */ 61 # ifdef RES_USE_INET6 62 bool resv6 = true; 63 64 if (family == AF_INET6) 65 { 66 /* From RFC2133, section 6.1 */ 67 resv6 = bitset(RES_USE_INET6, _res.options); 68 _res.options |= RES_USE_INET6; 69 } 70 # endif /* RES_USE_INET6 */ 71 SM_SET_H_ERRNO(0); 72 h = gethostbyname(name); 73 # ifdef RES_USE_INET6 74 if (!resv6) 75 _res.options &= ~RES_USE_INET6; 76 # endif 77 78 /* the function is supposed to return only the requested family */ 79 if (h != NULL && h->h_addrtype != family) 80 { 81 # if NETINET6 82 freehostent(h); 83 # endif 84 h = NULL; 85 *err = NO_DATA; 86 } 87 else 88 *err = h_errno; 89 return h; 90 # endif /* HAS_GETHOSTBYNAME2 */ 91 } 92 93 void 94 freehostent(h) 95 struct hostent *h; 96 { 97 /* 98 ** Stub routine -- if they don't have getipnodeby*(), 99 ** they probably don't have the free routine either. 100 */ 101 102 return; 103 } 104 #else /* NEEDSGETIPNODE && NETINET6 */ 105 #define sm_getipnodebyname getipnodebyname 106 #endif /* NEEDSGETIPNODE && NETINET6 */ 107 108 struct hostent * 109 mi_gethostbyname(name, family) 110 char *name; 111 int family; 112 { 113 struct hostent *h = NULL; 114 #if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) 115 # if SOLARIS == 20300 || SOLARIS == 203 116 static struct hostent hp; 117 static char buf[1000]; 118 extern struct hostent *_switch_gethostbyname_r(); 119 120 h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno); 121 # else /* SOLARIS == 20300 || SOLARIS == 203 */ 122 extern struct hostent *__switch_gethostbyname(); 123 124 h = __switch_gethostbyname(name); 125 # endif /* SOLARIS == 20300 || SOLARIS == 203 */ 126 #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */ 127 # if NETINET6 128 # ifndef SM_IPNODEBYNAME_FLAGS 129 /* For IPv4-mapped addresses, use: AI_DEFAULT|AI_ALL */ 130 # define SM_IPNODEBYNAME_FLAGS AI_ADDRCONFIG 131 # endif 132 133 int flags = SM_IPNODEBYNAME_FLAGS; 134 int err; 135 # endif /* NETINET6 */ 136 137 # if NETINET6 138 # if ADDRCONFIG_IS_BROKEN 139 flags &= ~AI_ADDRCONFIG; 140 # endif 141 h = sm_getipnodebyname(name, family, flags, &err); 142 SM_SET_H_ERRNO(err); 143 # else /* NETINET6 */ 144 h = gethostbyname(name); 145 # endif /* NETINET6 */ 146 147 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */ 148 149 /* the function is supposed to return only the requested family */ 150 if (h != NULL && h->h_addrtype != family) 151 { 152 #if NETINET6 153 freehostent(h); 154 #endif 155 h = NULL; 156 SM_SET_H_ERRNO(NO_DATA); 157 } 158 return h; 159 } 160 161 #if NETINET6 162 /* 163 ** MI_INET_PTON -- convert printed form to network address. 164 ** 165 ** Wrapper for inet_pton() which handles IPv6: labels. 166 ** 167 ** Parameters: 168 ** family -- address family 169 ** src -- string 170 ** dst -- destination address structure 171 ** 172 ** Returns: 173 ** 1 if the address was valid 174 ** 0 if the address wasn't parsable 175 ** -1 if error 176 */ 177 178 int 179 mi_inet_pton(family, src, dst) 180 int family; 181 const char *src; 182 void *dst; 183 { 184 if (family == AF_INET6 && 185 strncasecmp(src, "IPv6:", 5) == 0) 186 src += 5; 187 return inet_pton(family, src, dst); 188 } 189 #endif /* NETINET6 */ 190