1 /* $OpenBSD: herror.c,v 1.4 1997/03/13 19:07:28 downsj 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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * - 37 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 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, and that 42 * the name of Digital Equipment Corporation not be used in advertising or 43 * publicity pertaining to distribution of the document or software without 44 * specific, written prior permission. 45 * 46 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 47 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 48 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 49 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 50 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 51 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 52 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 53 * SOFTWARE. 54 * - 55 * --Copyright-- 56 */ 57 58 #if defined(LIBC_SCCS) && !defined(lint) 59 #if 0 60 static char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 61 static char rcsid[] = "$From: herror.c,v 8.3 1996/08/05 08:31:35 vixie Exp $"; 62 #else 63 static char rcsid[] = "$OpenBSD: herror.c,v 1.4 1997/03/13 19:07:28 downsj Exp $"; 64 #endif 65 #endif /* LIBC_SCCS and not lint */ 66 67 #include <sys/types.h> 68 #include <sys/param.h> 69 #include <sys/uio.h> 70 #include <netdb.h> 71 #include <unistd.h> 72 #include <string.h> 73 74 const char *h_errlist[] = { 75 "Resolver Error 0 (no error)", 76 "Unknown host", /* 1 HOST_NOT_FOUND */ 77 "Host name lookup failure", /* 2 TRY_AGAIN */ 78 "Unknown server error", /* 3 NO_RECOVERY */ 79 "No address associated with name", /* 4 NO_ADDRESS */ 80 }; 81 int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 82 83 extern int h_errno; 84 85 /* 86 * herror -- 87 * print the error indicated by the h_errno value. 88 */ 89 void 90 herror(s) 91 const char *s; 92 { 93 struct iovec iov[4]; 94 register struct iovec *v = iov; 95 96 if (s && *s) { 97 v->iov_base = (char *)s; 98 v->iov_len = strlen(s); 99 v++; 100 v->iov_base = ": "; 101 v->iov_len = 2; 102 v++; 103 } 104 v->iov_base = (char *)hstrerror(h_errno); 105 v->iov_len = strlen(v->iov_base); 106 v++; 107 v->iov_base = "\n"; 108 v->iov_len = 1; 109 writev(STDERR_FILENO, iov, (v - iov) + 1); 110 } 111 112 const char * 113 hstrerror(err) 114 int err; 115 { 116 if (err < 0) 117 return ("Resolver internal error"); 118 else if (err < h_nerr) 119 return (h_errlist[err]); 120 return ("Unknown resolver error"); 121 } 122