1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 36 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 37 * 38 * Permission to use, copy, modify, and distribute this software for any 39 * purpose with or without fee is hereby granted, provided that the above 40 * copyright notice and this permission notice appear in all copies. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 43 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 44 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 45 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 46 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 47 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 48 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 49 */ 50 51 #if defined(LIBC_SCCS) && !defined(lint) 52 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 53 static const char rcsid[] = "$Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $"; 54 #endif /* LIBC_SCCS and not lint */ 55 56 #include "port_before.h" 57 58 #ifdef _LIBC 59 #include "namespace.h" 60 #endif 61 62 #include <sys/types.h> 63 #include <sys/param.h> 64 #include <sys/uio.h> 65 66 #include <netinet/in.h> 67 #include <arpa/nameser.h> 68 69 #include <netdb.h> 70 #include <resolv.h> 71 #include <string.h> 72 #include <unistd.h> 73 #ifndef _LIBC 74 #include <irs.h> 75 #else 76 #include "un-namespace.h" 77 #endif 78 79 #include "port_after.h" 80 81 const char *h_errlist[] = { 82 "Resolver Error 0 (no error)", 83 "Unknown host", /*%< 1 HOST_NOT_FOUND */ 84 "Host name lookup failure", /*%< 2 TRY_AGAIN */ 85 "Unknown server error", /*%< 3 NO_RECOVERY */ 86 "No address associated with name", /*%< 4 NO_ADDRESS */ 87 }; 88 int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 89 90 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 91 #undef h_errno 92 int h_errno; 93 #endif 94 95 /*% 96 * herror -- 97 * print the error indicated by the h_errno value. 98 */ 99 void 100 herror(const char *s) { 101 struct iovec iov[4], *v = iov; 102 char *t; 103 104 if (s != NULL && *s != '\0') { 105 DE_CONST(s, t); 106 v->iov_base = t; 107 v->iov_len = strlen(t); 108 v++; 109 DE_CONST(": ", t); 110 v->iov_base = t; 111 v->iov_len = 2; 112 v++; 113 } 114 DE_CONST(hstrerror(*__h_errno()), t); 115 v->iov_base = t; 116 v->iov_len = strlen(v->iov_base); 117 v++; 118 DE_CONST("\n", t); 119 v->iov_base = t; 120 v->iov_len = 1; 121 #ifndef _LIBC 122 writev(STDERR_FILENO, iov, (v - iov) + 1); 123 #else 124 _writev(STDERR_FILENO, iov, (v - iov) + 1); 125 #endif 126 } 127 128 /*% 129 * hstrerror -- 130 * return the string associated with a given "host" errno value. 131 */ 132 const char * 133 hstrerror(int err) { 134 if (err < 0) 135 return ("Resolver internal error"); 136 else if (err < h_nerr) 137 return (h_errlist[err]); 138 return ("Unknown resolver error"); 139 } 140 141 /*! \file */ 142