1 /* $NetBSD: herror.c,v 1.6 2014/12/10 04:38:02 christos Exp $ */ 2 3 /* 4 * Portions Copyright (C) 2004, 2005, 2007, 2011, 2012, 2014 Internet Systems Consortium, Inc. ("ISC") 5 * Portions Copyright (C) 2000, 2001, 2003 Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 17 * PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /* 21 * Copyright (c) 1987, 1993 22 * The Regents of the University of California. All rights reserved. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 1. Redistributions of source code must retain the above copyright 28 * notice, this list of conditions and the following disclaimer. 29 * 2. Redistributions in binary form must reproduce the above copyright 30 * notice, this list of conditions and the following disclaimer in the 31 * documentation and/or other materials provided with the distribution. 32 * 3. Neither the name of the University nor the names of its contributors 33 * may be used to endorse or promote products derived from this software 34 * without specific prior written permission. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 */ 48 49 /*! \file herror.c 50 lwres_herror() prints the string s on stderr followed by the string 51 generated by lwres_hstrerror() for the error code stored in the global 52 variable lwres_h_errno. 53 54 lwres_hstrerror() returns an appropriate string for the error code 55 gievn by err. The values of the error codes and messages are as 56 follows: 57 58 \li #NETDB_SUCCESS: Resolver Error 0 (no error) 59 60 \li #HOST_NOT_FOUND: Unknown host 61 62 \li #TRY_AGAIN: Host name lookup failure 63 64 \li #NO_RECOVERY: Unknown server error 65 66 \li #NO_DATA: No address associated with name 67 68 */ 69 70 #if defined(LIBC_SCCS) && !defined(lint) 71 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 72 static const char rcsid[] = 73 "Id"; 74 #endif /* LIBC_SCCS and not lint */ 75 76 #include <config.h> 77 78 #include <stdio.h> 79 80 #include <lwres/netdb.h> 81 #include <lwres/platform.h> 82 83 LIBLWRES_EXTERNAL_DATA int lwres_h_errno; 84 85 /*! 86 * these have never been declared in any header file so make them static 87 */ 88 89 static const char *h_errlist[] = { 90 "Resolver Error 0 (no error)", /*%< 0 no error */ 91 "Unknown host", /*%< 1 HOST_NOT_FOUND */ 92 "Host name lookup failure", /*%< 2 TRY_AGAIN */ 93 "Unknown server error", /*%< 3 NO_RECOVERY */ 94 "No address associated with name", /*%< 4 NO_ADDRESS */ 95 }; 96 97 static int h_nerr = sizeof(h_errlist) / sizeof(h_errlist[0]); 98 99 100 /*! 101 * herror -- 102 * print the error indicated by the h_errno value. 103 */ 104 void 105 lwres_herror(const char *s) { 106 fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno)); 107 } 108 109 /*! 110 * hstrerror -- 111 * return the string associated with a given "host" errno value. 112 */ 113 const char * 114 lwres_hstrerror(int err) { 115 if (err < 0) 116 return ("Resolver internal error"); 117 else if (err < h_nerr) 118 return (h_errlist[err]); 119 return ("Unknown resolver error"); 120 } 121