1 /* $OpenBSD: herror.c,v 1.8 2005/08/06 20:30:03 espie 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 #include <sys/types.h> 55 #include <sys/param.h> 56 #include <sys/uio.h> 57 #include <netdb.h> 58 #include <unistd.h> 59 #include <string.h> 60 61 const char * const h_errlist[] = { 62 "Resolver Error 0 (no error)", 63 "Unknown host", /* 1 HOST_NOT_FOUND */ 64 "Host name lookup failure", /* 2 TRY_AGAIN */ 65 "Unknown server error", /* 3 NO_RECOVERY */ 66 "No address associated with name", /* 4 NO_ADDRESS */ 67 }; 68 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 69 70 extern int h_errno; 71 72 /* 73 * herror -- 74 * print the error indicated by the h_errno value. 75 */ 76 void 77 herror(const char *s) 78 { 79 struct iovec iov[4]; 80 struct iovec *v = iov; 81 82 if (s && *s) { 83 v->iov_base = (char *)s; 84 v->iov_len = strlen(s); 85 v++; 86 v->iov_base = ": "; 87 v->iov_len = 2; 88 v++; 89 } 90 v->iov_base = (char *)hstrerror(h_errno); 91 v->iov_len = strlen(v->iov_base); 92 v++; 93 v->iov_base = "\n"; 94 v->iov_len = 1; 95 writev(STDERR_FILENO, iov, (v - iov) + 1); 96 } 97 98 const char * 99 hstrerror(int err) 100 { 101 if (err < 0) 102 return ("Resolver internal error"); 103 else if (err < h_nerr) 104 return (h_errlist[err]); 105 return ("Unknown resolver error"); 106 } 107