1 /* $NetBSD: herror.c,v 1.1.1.1 2009/04/12 15:33:57 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 38 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 39 * 40 * Permission to use, copy, modify, and distribute this software for any 41 * purpose with or without fee is hereby granted, provided that the above 42 * copyright notice and this permission notice appear in all copies. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 45 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 46 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 47 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 48 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 49 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 50 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 51 */ 52 53 #if defined(LIBC_SCCS) && !defined(lint) 54 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 55 static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp"; 56 #endif /* LIBC_SCCS and not lint */ 57 58 #include "port_before.h" 59 60 #include <sys/types.h> 61 #include <sys/param.h> 62 #include <sys/uio.h> 63 64 #include <netinet/in.h> 65 #include <arpa/nameser.h> 66 67 #include <netdb.h> 68 #include <resolv.h> 69 #include <string.h> 70 #include <unistd.h> 71 #include <irs.h> 72 73 #include "port_after.h" 74 75 const char *h_errlist[] = { 76 "Resolver Error 0 (no error)", 77 "Unknown host", /*%< 1 HOST_NOT_FOUND */ 78 "Host name lookup failure", /*%< 2 TRY_AGAIN */ 79 "Unknown server error", /*%< 3 NO_RECOVERY */ 80 "No address associated with name", /*%< 4 NO_ADDRESS */ 81 }; 82 int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 83 84 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 85 #undef h_errno 86 int h_errno; 87 #endif 88 89 /*% 90 * herror -- 91 * print the error indicated by the h_errno value. 92 */ 93 void 94 herror(const char *s) { 95 struct iovec iov[4], *v = iov; 96 char *t; 97 98 if (s != NULL && *s != '\0') { 99 DE_CONST(s, t); 100 v->iov_base = t; 101 v->iov_len = strlen(t); 102 v++; 103 DE_CONST(": ", t); 104 v->iov_base = t; 105 v->iov_len = 2; 106 v++; 107 } 108 DE_CONST(hstrerror(*__h_errno()), t); 109 v->iov_base = t; 110 v->iov_len = strlen(v->iov_base); 111 v++; 112 DE_CONST("\n", t); 113 v->iov_base = t; 114 v->iov_len = 1; 115 writev(STDERR_FILENO, iov, (v - iov) + 1); 116 } 117 118 /*% 119 * hstrerror -- 120 * return the string associated with a given "host" errno value. 121 */ 122 const char * 123 hstrerror(int err) { 124 if (err < 0) 125 return ("Resolver internal error"); 126 else if (err < h_nerr) 127 return (h_errlist[err]); 128 return ("Unknown resolver error"); 129 } 130 131 /*! \file */ 132