1 /* $NetBSD: herror.c,v 1.4 2004/05/23 05:09:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 38 * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 39 * 40 * Permission to use, copy, modify, and distribute this software for any 41 * purpose with or without fee is hereby granted, provided that the above 42 * copyright notice and this permission notice appear in all copies. 43 * 44 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 45 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 46 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 47 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 48 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 49 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 50 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 51 */ 52 53 #include <sys/cdefs.h> 54 #if defined(LIBC_SCCS) && !defined(lint) 55 #ifdef notdef 56 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 57 static const char rcsid[] = "Id: herror.c,v 1.2.206.1 2004/03/09 08:33:54 marka Exp"; 58 #else 59 __RCSID("$NetBSD: herror.c,v 1.4 2004/05/23 05:09:52 christos 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 67 #include <netinet/in.h> 68 #include <arpa/nameser.h> 69 70 #include <netdb.h> 71 #ifdef ANDROID_CHANGES 72 #include "resolv_private.h" 73 #else 74 #include <resolv.h> 75 #endif 76 #include <string.h> 77 #include <unistd.h> 78 79 #ifndef DE_CONST 80 #define DE_CONST(c,v) v = ((c) ? \ 81 strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL) 82 #endif 83 84 const char * const h_errlist[] = { 85 "Resolver Error 0 (no error)", 86 "Unknown host", /* 1 HOST_NOT_FOUND */ 87 "Host name lookup failure", /* 2 TRY_AGAIN */ 88 "Unknown server error", /* 3 NO_RECOVERY */ 89 "No address associated with name", /* 4 NO_ADDRESS */ 90 }; 91 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 92 93 /* 94 * herror -- 95 * print the error indicated by the h_errno value. 96 */ 97 void 98 herror(const char *s) { 99 struct iovec iov[4], *v = iov; 100 char *t; 101 102 if (s != NULL && *s != '\0') { 103 DE_CONST(s, t); 104 v->iov_base = t; 105 v->iov_len = strlen(t); 106 v++; 107 DE_CONST(": ", t); 108 v->iov_base = t; 109 v->iov_len = 2; 110 v++; 111 } 112 DE_CONST(hstrerror(h_errno), t); 113 v->iov_base = t; 114 v->iov_len = strlen(v->iov_base); 115 v++; 116 DE_CONST("\n", t); 117 v->iov_base = t; 118 v->iov_len = 1; 119 writev(STDERR_FILENO, iov, (v - iov) + 1); 120 } 121 122 /* 123 * hstrerror -- 124 * return the string associated with a given "host" errno value. 125 */ 126 const char * 127 hstrerror(int err) { 128 if (err < 0) 129 return ("Resolver internal error"); 130 else if (err < h_nerr) 131 return (h_errlist[err]); 132 return ("Unknown resolver error"); 133 } 134
