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