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 /* 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 *sm_getipnodebyname __P((const 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 *
sm_getipnodebyname(name,family,flags,err)46 sm_getipnodebyname(name, family, flags, err)
47 const 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
66 /* the function is supposed to return only the requested family */
67 if (h != NULL && h->h_addrtype != family)
68 {
69 # if NETINET6
70 freehostent(h);
71 # endif /* NETINET6 */
72 h = NULL;
73 *err = NO_DATA;
74 }
75 else
76 *err = h_errno;
77 return h;
78 }
79
80 void
freehostent(h)81 freehostent(h)
82 struct hostent *h;
83 {
84 /*
85 ** Stub routine -- if they don't have getipnodeby*(),
86 ** they probably don't have the free routine either.
87 */
88
89 return;
90 }
91 #else /* NEEDSGETIPNODE && NETINET6 */
92 #define sm_getipnodebyname getipnodebyname
93 #endif /* NEEDSGETIPNODE && NETINET6 */
94
95 struct hostent *
mi_gethostbyname(name,family)96 mi_gethostbyname(name, family)
97 char *name;
98 int family;
99 {
100 struct hostent *h = NULL;
101 #if (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4))
102 # if SOLARIS == 20300 || SOLARIS == 203
103 static struct hostent hp;
104 static char buf[1000];
105 extern struct hostent *_switch_gethostbyname_r();
106
107 h = _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno);
108 # else /* SOLARIS == 20300 || SOLARIS == 203 */
109 extern struct hostent *__switch_gethostbyname();
110
111 h = __switch_gethostbyname(name);
112 # endif /* SOLARIS == 20300 || SOLARIS == 203 */
113 #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
114 # if NETINET6
115 # ifndef SM_IPNODEBYNAME_FLAGS
116 /* For IPv4-mapped addresses, use: AI_DEFAULT|AI_ALL */
117 # define SM_IPNODEBYNAME_FLAGS AI_ADDRCONFIG
118 # endif /* SM_IPNODEBYNAME_FLAGS */
119
120 int flags = SM_IPNODEBYNAME_FLAGS;
121 int err;
122 # endif /* NETINET6 */
123
124 # if NETINET6
125 # if ADDRCONFIG_IS_BROKEN
126 flags &= ~AI_ADDRCONFIG;
127 # endif /* ADDRCONFIG_IS_BROKEN */
128 h = sm_getipnodebyname(name, family, flags, &err);
129 SM_SET_H_ERRNO(err);
130 # else /* NETINET6 */
131 h = gethostbyname(name);
132 # endif /* NETINET6 */
133
134 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
135
136 /* the function is supposed to return only the requested family */
137 if (h != NULL && h->h_addrtype != family)
138 {
139 # if NETINET6
140 freehostent(h);
141 # endif /* NETINET6 */
142 h = NULL;
143 SM_SET_H_ERRNO(NO_DATA);
144 }
145 return h;
146 }
147
148 #if NETINET6
149 /*
150 ** MI_INET_PTON -- convert printed form to network address.
151 **
152 ** Wrapper for inet_pton() which handles IPv6: labels.
153 **
154 ** Parameters:
155 ** family -- address family
156 ** src -- string
157 ** dst -- destination address structure
158 **
159 ** Returns:
160 ** 1 if the address was valid
161 ** 0 if the address wasn't parseable
162 ** -1 if error
163 */
164
165 int
mi_inet_pton(family,src,dst)166 mi_inet_pton(family, src, dst)
167 int family;
168 const char *src;
169 void *dst;
170 {
171 if (family == AF_INET6 &&
172 strncasecmp(src, "IPv6:", 5) == 0)
173 src += 5;
174 return inet_pton(family, src, dst);
175 }
176 #endif /* NETINET6 */
177