1 /* $OpenBSD: herror.c,v 1.7 2005/03/25 13:24:12 otto Exp $ */ 2 3 /* 4 * ++Copyright++ 1987, 1993 5 * - 6 * Copyright (c) 1987, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. 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 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 34 * 35 * Permission to use, copy, modify, and distribute this software for any 36 * purpose with or without fee is hereby granted, provided that the above 37 * copyright notice and this permission notice appear in all copies, and that 38 * the name of Digital Equipment Corporation not be used in advertising or 39 * publicity pertaining to distribution of the document or software without 40 * specific, written prior permission. 41 * 42 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 43 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 44 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 45 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 46 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 47 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 48 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 49 * SOFTWARE. 50 * - 51 * --Copyright-- 52 */ 53 54 #if defined(LIBC_SCCS) && !defined(lint) 55 #if 0 56 static char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 57 static char rcsid[] = "$From: herror.c,v 8.3 1996/08/05 08:31:35 vixie Exp $"; 58 #else 59 static char rcsid[] = "$OpenBSD: herror.c,v 1.7 2005/03/25 13:24:12 otto Exp $"; 60 #endif 61 #endif /* LIBC_SCCS and not lint */ 62 63 #include <sys/types.h> 64 #include <sys/param.h> 65 #include <sys/uio.h> 66 #include <netdb.h> 67 #include <unistd.h> 68 #include <string.h> 69 70 const char * const h_errlist[] = { 71 "Resolver Error 0 (no error)", 72 "Unknown host", /* 1 HOST_NOT_FOUND */ 73 "Host name lookup failure", /* 2 TRY_AGAIN */ 74 "Unknown server error", /* 3 NO_RECOVERY */ 75 "No address associated with name", /* 4 NO_ADDRESS */ 76 }; 77 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 78 79 extern int h_errno; 80 81 /* 82 * herror -- 83 * print the error indicated by the h_errno value. 84 */ 85 void 86 herror(const char *s) 87 { 88 struct iovec iov[4]; 89 struct iovec *v = iov; 90 91 if (s && *s) { 92 v->iov_base = (char *)s; 93 v->iov_len = strlen(s); 94 v++; 95 v->iov_base = ": "; 96 v->iov_len = 2; 97 v++; 98 } 99 v->iov_base = (char *)hstrerror(h_errno); 100 v->iov_len = strlen(v->iov_base); 101 v++; 102 v->iov_base = "\n"; 103 v->iov_len = 1; 104 writev(STDERR_FILENO, iov, (v - iov) + 1); 105 } 106 107 const char * 108 hstrerror(int err) 109 { 110 if (err < 0) 111 return ("Resolver internal error"); 112 else if (err < h_nerr) 113 return (h_errlist[err]); 114 return ("Unknown resolver error"); 115 } 116