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