xref: /illumos-gate/usr/src/lib/gss_mechs/mech_krb5/include/fake-addrinfo.h (revision 1f606c5b8e527ed924f5cbdbbce612887c7dbe32)
1 /*
2  * Copyright (C) 2001,2002,2003,2004 by the Massachusetts Institute of Technology,
3  * Cambridge, MA, USA.  All Rights Reserved.
4  *
5  * This software is being provided to you, the LICENSEE, by the
6  * Massachusetts Institute of Technology (M.I.T.) under the following
7  * license.  By obtaining, using and/or copying this software, you agree
8  * that you have read, understood, and will comply with these terms and
9  * conditions:
10  *
11  * Export of this software from the United States of America may
12  * require a specific license from the United States Government.
13  * It is the responsibility of any person or organization contemplating
14  * export to obtain such a license before exporting.
15  *
16  * WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute
17  * this software and its documentation for any purpose and without fee or
18  * royalty is hereby granted, provided that you agree to comply with the
19  * following copyright notice and statements, including the disclaimer, and
20  * that the same appear on ALL copies of the software and documentation,
21  * including modifications that you make for internal use or for
22  * distribution:
23  *
24  * THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS
25  * OR WARRANTIES, EXPRESS OR IMPLIED.  By way of example, but not
26  * limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF
27  * MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF
28  * THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY
29  * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS.
30  *
31  * The name of the Massachusetts Institute of Technology or M.I.T. may NOT
32  * be used in advertising or publicity pertaining to distribution of the
33  * software.  Title to copyright in this software and any associated
34  * documentation shall at all times remain with M.I.T., and USER agrees to
35  * preserve same.
36  *
37  * Furthermore if you modify this software you must label
38  * your software as modified software and not distribute it in such a
39  * fashion that it might be confused with the original M.I.T. software.
40  */
41 
42 /* Approach overview:
43 
44    If a system version is available but buggy, save handles to it (via
45    inline functions in a support library), redefine the names to refer
46    to library functions, and in those functions, call the system
47    versions and fix up the returned data.  Use the native data
48    structures and flag values.
49 
50    If no system version exists, use gethostby* and fake it.  Define
51    the data structures and flag values locally.
52 
53 
54    On Mac OS X, getaddrinfo results aren't cached (though
55    gethostbyname results are), so we need to build a cache here.  Now
56    things are getting really messy.  Because the cache is in use, we
57    use getservbyname, and throw away thread safety.  (Not that the
58    cache is thread safe, but when we get locking support, that'll be
59    dealt with.)  This code needs tearing down and rebuilding, soon.
60 
61 
62    Note that recent Windows developers' code has an interesting hack:
63    When you include the right header files, with the right set of
64    macros indicating system versions, you'll get an inline function
65    that looks for getaddrinfo (or whatever) in the system library, and
66    calls it if it's there.  If it's not there, it fakes it with
67    gethostby* calls.
68 
69    We're taking a simpler approach: A system provides these routines or
70    it does not.
71 
72    Someday, we may want to take into account different versions (say,
73    different revs of GNU libc) where some are broken in one way, and
74    some work or are broken in another way.  Cross that bridge when we
75    come to it.  */
76 
77 /* To do, maybe:
78 
79    + For AIX 4.3.3, using the RFC 2133 definition: Implement
80      AI_NUMERICHOST.  It's not defined in the header file.
81 
82      For certain (old?) versions of GNU libc, AI_NUMERICHOST is
83      defined but not implemented.
84 
85    + Use gethostbyname2, inet_aton and other IPv6 or thread-safe
86      functions if available.  But, see
87      http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=135182 for one
88      gethostbyname2 problem on Linux.  And besides, if a platform is
89      supporting IPv6 at all, they really should be doing getaddrinfo
90      by now.
91 
92    + inet_ntop, inet_pton
93 
94    + Conditionally export/import the function definitions, so a
95      library can have a single copy instead of multiple.
96 
97    + Upgrade host requirements to include working implementations of
98      these functions, and throw all this away.  Pleeease?  :-)  */
99 
100 #ifndef FAI_DEFINED
101 #define FAI_DEFINED
102 #include "port-sockets.h"
103 #include "socket-utils.h"
104 
105 #if !defined (HAVE_GETADDRINFO)
106 
107 #undef  addrinfo
108 #define addrinfo	my_fake_addrinfo
109 
110 struct addrinfo {
111     int ai_family;		/* PF_foo */
112     int ai_socktype;		/* SOCK_foo */
113     int ai_protocol;		/* 0, IPPROTO_foo */
114     int ai_flags;		/* AI_PASSIVE etc */
115     size_t ai_addrlen;		/* real length of socket address */
116     char *ai_canonname;		/* canonical name of host */
117     struct sockaddr *ai_addr;	/* pointer to variable-size address */
118     struct addrinfo *ai_next;	/* next in linked list */
119 };
120 
121 #undef	AI_PASSIVE
122 #define	AI_PASSIVE	0x01
123 #undef	AI_CANONNAME
124 #define	AI_CANONNAME	0x02
125 #undef	AI_NUMERICHOST
126 #define	AI_NUMERICHOST	0x04
127 /* RFC 2553 says these are part of the interface for getipnodebyname,
128    not for getaddrinfo.  RFC 3493 says they're part of the interface
129    for getaddrinfo, and getipnodeby* are deprecated.  Our fake
130    getaddrinfo implementation here does IPv4 only anyways.  */
131 #undef	AI_V4MAPPED
132 #define	AI_V4MAPPED	0
133 #undef	AI_ADDRCONFIG
134 #define	AI_ADDRCONFIG	0
135 #undef	AI_ALL
136 #define	AI_ALL		0
137 #undef	AI_DEFAULT
138 #define	AI_DEFAULT	(AI_V4MAPPED|AI_ADDRCONFIG)
139 
140 #ifndef NI_MAXHOST
141 #define NI_MAXHOST 1025
142 #endif
143 #ifndef NI_MAXSERV
144 #define NI_MAXSERV 32
145 #endif
146 
147 #undef	NI_NUMERICHOST
148 #define NI_NUMERICHOST	0x01
149 #undef	NI_NUMERICSERV
150 #define NI_NUMERICSERV	0x02
151 #undef	NI_NAMEREQD
152 #define NI_NAMEREQD	0x04
153 #undef	NI_DGRAM
154 #define NI_DGRAM	0x08
155 #undef	NI_NOFQDN
156 #define NI_NOFQDN	0x10
157 
158 
159 #undef  EAI_ADDRFAMILY
160 #define EAI_ADDRFAMILY	1
161 #undef  EAI_AGAIN
162 #define EAI_AGAIN	2
163 #undef  EAI_BADFLAGS
164 #define EAI_BADFLAGS	3
165 #undef  EAI_FAIL
166 #define EAI_FAIL	4
167 #undef  EAI_FAMILY
168 #define EAI_FAMILY	5
169 #undef  EAI_MEMORY
170 #define EAI_MEMORY	6
171 #undef  EAI_NODATA
172 #define EAI_NODATA	7
173 #undef  EAI_NONAME
174 #define EAI_NONAME	8
175 #undef  EAI_SERVICE
176 #define EAI_SERVICE	9
177 #undef  EAI_SOCKTYPE
178 #define EAI_SOCKTYPE	10
179 #undef  EAI_SYSTEM
180 #define EAI_SYSTEM	11
181 
182 #endif /* ! HAVE_GETADDRINFO */
183 
184 /* Fudge things on older gai implementations.  */
185 /* AIX 4.3.3 is based on RFC 2133; no AI_NUMERICHOST.  */
186 #ifndef AI_NUMERICHOST
187 # define AI_NUMERICHOST 0
188 #endif
189 /* Partial RFC 2553 implementations may not have AI_ADDRCONFIG and
190    friends, which RFC 3493 says are now part of the getaddrinfo
191    interface, and we'll want to use.  */
192 #ifndef AI_ADDRCONFIG
193 # define AI_ADDRCONFIG 0
194 #endif
195 #ifndef AI_V4MAPPED
196 # define AI_V4MAPPED 0
197 #endif
198 #ifndef AI_ALL
199 # define AI_ALL 0
200 #endif
201 #ifndef AI_DEFAULT
202 # define AI_DEFAULT (AI_ADDRCONFIG|AI_V4MAPPED)
203 #endif
204 
205 #if defined(KRB5_USE_INET6) && defined(NEED_INSIXADDR_ANY)
206 /* If compiling with IPv6 support and C library does not define in6addr_any */
207 extern const struct in6_addr krb5int_in6addr_any;
208 #undef in6addr_any
209 #define in6addr_any krb5int_in6addr_any
210 #endif
211 
212 /* Call out to stuff defined in libkrb5support.  */
213 extern int krb5int_getaddrinfo (const char *node, const char *service,
214 				const struct addrinfo *hints,
215 				struct addrinfo **aip);
216 extern void krb5int_freeaddrinfo (struct addrinfo *ai);
217 extern const char *krb5int_gai_strerror(int err);
218 extern int krb5int_getnameinfo (const struct sockaddr *sa, socklen_t salen,
219 				char *hbuf, size_t hbuflen,
220 				char *sbuf, size_t sbuflen,
221 				int flags);
222 #ifndef IMPLEMENT_FAKE_GETADDRINFO
223 #undef	getaddrinfo
224 #define getaddrinfo krb5int_getaddrinfo
225 #undef  freeaddrinfo
226 #define freeaddrinfo krb5int_freeaddrinfo
227 #undef  gai_strerror
228 #define gai_strerror krb5int_gai_strerror
229 #undef  getnameinfo
230 #define getnameinfo krb5int_getnameinfo
231 #endif
232 
233 #endif /* FAI_DEFINED */
234