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