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