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