1 /* 2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 7 /* 8 * Copyright (C) 2001,2005 by the Massachusetts Institute of Technology, 9 * Cambridge, MA, USA. All Rights Reserved. 10 * 11 * This software is being provided to you, the LICENSEE, by the 12 * Massachusetts Institute of Technology (M.I.T.) under the following 13 * license. By obtaining, using and/or copying this software, you agree 14 * that you have read, understood, and will comply with these terms and 15 * conditions: 16 * 17 * Export of this software from the United States of America may 18 * require a specific license from the United States Government. 19 * It is the responsibility of any person or organization contemplating 20 * export to obtain such a license before exporting. 21 * 22 * WITHIN THAT CONSTRAINT, permission to use, copy, modify and distribute 23 * this software and its documentation for any purpose and without fee or 24 * royalty is hereby granted, provided that you agree to comply with the 25 * following copyright notice and statements, including the disclaimer, and 26 * that the same appear on ALL copies of the software and documentation, 27 * including modifications that you make for internal use or for 28 * distribution: 29 * 30 * THIS SOFTWARE IS PROVIDED "AS IS", AND M.I.T. MAKES NO REPRESENTATIONS 31 * OR WARRANTIES, EXPRESS OR IMPLIED. By way of example, but not 32 * limitation, M.I.T. MAKES NO REPRESENTATIONS OR WARRANTIES OF 33 * MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF 34 * THE LICENSED SOFTWARE OR DOCUMENTATION WILL NOT INFRINGE ANY THIRD PARTY 35 * PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS. 36 * 37 * The name of the Massachusetts Institute of Technology or M.I.T. may NOT 38 * be used in advertising or publicity pertaining to distribution of the 39 * software. Title to copyright in this software and any associated 40 * documentation shall at all times remain with M.I.T., and USER agrees to 41 * preserve same. 42 * 43 * Furthermore if you modify this software you must label 44 * your software as modified software and not distribute it in such a 45 * fashion that it might be confused with the original M.I.T. software. 46 */ 47 48 #ifndef SOCKET_UTILS_H 49 #define SOCKET_UTILS_H 50 51 /* Some useful stuff cross-platform for manipulating socket addresses. 52 We assume at least ipv4 sockaddr_in support. The sockaddr_storage 53 stuff comes from the ipv6 socket api enhancements; socklen_t is 54 provided on some systems; the rest is just convenience for internal 55 use in the krb5 tree. 56 57 Do NOT install this file. */ 58 59 /* for HAVE_SOCKLEN_T, KRB5_USE_INET6, etc */ 60 #include "autoconf.h" 61 /* for sockaddr_storage */ 62 #include "port-sockets.h" 63 /* for "inline" if needed */ 64 #include "k5-platform.h" 65 66 #if defined (__GNUC__) 67 /* 68 * There's a lot of confusion between pointers to different sockaddr 69 * types, and pointers with different degrees of indirection, as in 70 * the locate_kdc type functions. Use these function to ensure we 71 * don't do something silly like cast a "sockaddr **" to a 72 * "sockaddr_in *". 73 * 74 * The casts to (void *) are to get GCC to shut up about alignment 75 * increasing. 76 */ 77 static __inline__ struct sockaddr_in *sa2sin (struct sockaddr *sa) 78 { 79 return (struct sockaddr_in *) (void *) sa; 80 } 81 #ifdef KRB5_USE_INET6 82 static __inline__ struct sockaddr_in6 *sa2sin6 (struct sockaddr *sa) 83 { 84 return (struct sockaddr_in6 *) (void *) sa; 85 } 86 #endif 87 static __inline__ struct sockaddr *ss2sa (struct sockaddr_storage *ss) 88 { 89 return (struct sockaddr *) ss; 90 } 91 static __inline__ struct sockaddr_in *ss2sin (struct sockaddr_storage *ss) 92 { 93 return (struct sockaddr_in *) ss; 94 } 95 #ifdef KRB5_USE_INET6 96 static __inline__ struct sockaddr_in6 *ss2sin6 (struct sockaddr_storage *ss) 97 { 98 return (struct sockaddr_in6 *) ss; 99 } 100 #endif 101 #else 102 #define sa2sin(S) ((struct sockaddr_in *)(S)) 103 #define sa2sin6(S) ((struct sockaddr_in6 *)(S)) 104 #define ss2sa(S) ((struct sockaddr *)(S)) 105 #define ss2sin(S) ((struct sockaddr_in *)(S)) 106 #define ss2sin6(S) ((struct sockaddr_in6 *)(S)) 107 #endif 108 109 #if !defined (socklen) 110 /* socklen_t socklen (struct sockaddr *) */ 111 # ifdef HAVE_SA_LEN 112 # define socklen(X) ((X)->sa_len) 113 # else 114 # ifdef KRB5_USE_INET6 115 # define socklen(X) ((X)->sa_family == AF_INET6 ? (socklen_t) sizeof (struct sockaddr_in6) : (X)->sa_family == AF_INET ? (socklen_t) sizeof (struct sockaddr_in) : (socklen_t) sizeof (struct sockaddr)) 116 # else 117 # define socklen(X) ((X)->sa_family == AF_INET ? (socklen_t) sizeof (struct sockaddr_in) : (socklen_t) sizeof (struct sockaddr)) 118 # endif 119 # endif 120 #endif 121 122 #endif /* SOCKET_UTILS_H */ 123