1/* $NetBSD: gai_strerror.c,v 1.1 2024/02/18 20:57:47 christos Exp $ */ 2 3/* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16/*! \file gai_strerror.c 17 * gai_strerror() returns an error message corresponding to an 18 * error code returned by getaddrinfo() and getnameinfo(). The following error 19 * codes and their meaning are defined in 20 * \link netdb.h include/irs/netdb.h.\endlink 21 * This implementation is almost an exact copy of lwres/gai_sterror.c except 22 * that it catches up the latest API standard, RFC3493. 23 * 24 * \li #EAI_ADDRFAMILY address family for hostname not supported 25 * \li #EAI_AGAIN temporary failure in name resolution 26 * \li #EAI_BADFLAGS invalid value for ai_flags 27 * \li #EAI_FAIL non-recoverable failure in name resolution 28 * \li #EAI_FAMILY ai_family not supported 29 * \li #EAI_MEMORY memory allocation failure 30 * \li #EAI_NODATA no address associated with hostname (obsoleted in RFC3493) 31 * \li #EAI_NONAME hostname nor servname provided, or not known 32 * \li #EAI_SERVICE servname not supported for ai_socktype 33 * \li #EAI_SOCKTYPE ai_socktype not supported 34 * \li #EAI_SYSTEM system error returned in errno 35 * \li #EAI_BADHINTS Invalid value for hints (non-standard) 36 * \li #EAI_PROTOCOL Resolved protocol is unknown (non-standard) 37 * \li #EAI_OVERFLOW Argument buffer overflow 38 * \li #EAI_INSECUREDATA Insecure Data (experimental) 39 * 40 * The message invalid error code is returned if ecode is out of range. 41 * 42 * ai_flags, ai_family and ai_socktype are elements of the struct 43 * addrinfo used by lwres_getaddrinfo(). 44 * 45 * \section gai_strerror_see See Also 46 * 47 * strerror(), getaddrinfo(), getnameinfo(), RFC3493. 48 */ 49 50#include <isc/net.h> 51 52#include <irs/netdb.h> 53 54/*% Text of error messages. */ 55static const char *gai_messages[] = { "no error", 56 "address family for hostname not " 57 "supported", 58 "temporary failure in name resolution", 59 "invalid value for ai_flags", 60 "non-recoverable failure in name " 61 "resolution", 62 "ai_family not supported", 63 "memory allocation failure", 64 "no address associated with hostname", 65 "hostname nor servname provided, or not " 66 "known", 67 "servname not supported for ai_socktype", 68 "ai_socktype not supported", 69 "system error returned in errno", 70 "bad hints", 71 "bad protocol", 72 "argument buffer overflow", 73 "insecure data provided" }; 74 75/*% 76 * Returns an error message corresponding to an error code returned by 77 * getaddrinfo() and getnameinfo() 78 */ 79#if defined _WIN32 80char * 81#else /* if defined _WIN32 */ 82const char * 83#endif /* if defined _WIN32 */ 84gai_strerror(int ecode) { 85 union { 86 const char *const_ptr; 87 char *deconst_ptr; 88 } ptr; 89 90 if ((ecode < 0) || 91 (ecode >= (int)(sizeof(gai_messages) / sizeof(*gai_messages)))) 92 { 93 ptr.const_ptr = "invalid error code"; 94 } else { 95 ptr.const_ptr = gai_messages[ecode]; 96 } 97 return (ptr.deconst_ptr); 98} 99