herror.c revision 156952
1156952Sume/* 2156952Sume * Copyright (c) 1987, 1993 3156952Sume * The Regents of the University of California. All rights reserved. 4156952Sume * 5156952Sume * Redistribution and use in source and binary forms, with or without 6156952Sume * modification, are permitted provided that the following conditions 7156952Sume * are met: 8156952Sume * 1. Redistributions of source code must retain the above copyright 9156952Sume * notice, this list of conditions and the following disclaimer. 10156952Sume * 2. Redistributions in binary form must reproduce the above copyright 11156952Sume * notice, this list of conditions and the following disclaimer in the 12156952Sume * documentation and/or other materials provided with the distribution. 13156952Sume * 3. All advertising materials mentioning features or use of this software 14156952Sume * must display the following acknowledgement: 15156952Sume * This product includes software developed by the University of 16156952Sume * California, Berkeley and its contributors. 17156952Sume * 4. Neither the name of the University nor the names of its contributors 18156952Sume * may be used to endorse or promote products derived from this software 19156952Sume * without specific prior written permission. 20156952Sume * 21156952Sume * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22156952Sume * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23156952Sume * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24156952Sume * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25156952Sume * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26156952Sume * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27156952Sume * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28156952Sume * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29156952Sume * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30156952Sume * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31156952Sume * SUCH DAMAGE. 32156952Sume */ 33156952Sume 34156952Sume/* 35156952Sume * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 36156952Sume * Portions Copyright (c) 1996-1999 by Internet Software Consortium. 37156952Sume * 38156952Sume * Permission to use, copy, modify, and distribute this software for any 39156952Sume * purpose with or without fee is hereby granted, provided that the above 40156952Sume * copyright notice and this permission notice appear in all copies. 41156952Sume * 42156952Sume * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 43156952Sume * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 44156952Sume * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 45156952Sume * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 46156952Sume * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 47156952Sume * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 48156952Sume * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 49156952Sume */ 50156952Sume 51156952Sume#if defined(LIBC_SCCS) && !defined(lint) 52156952Sumestatic const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; 53156952Sumestatic const char rcsid[] = "$Id: herror.c,v 1.2.206.1 2004/03/09 08:33:54 marka Exp $"; 54156952Sume#endif /* LIBC_SCCS and not lint */ 55156952Sume 56156952Sume#include "port_before.h" 57156952Sume 58156952Sume#include <sys/types.h> 59156952Sume#include <sys/param.h> 60156952Sume#include <sys/uio.h> 61156952Sume 62156952Sume#include <netinet/in.h> 63156952Sume#include <arpa/nameser.h> 64156952Sume 65156952Sume#include <netdb.h> 66156952Sume#include <resolv.h> 67156952Sume#include <string.h> 68156952Sume#include <unistd.h> 69156952Sume#include <irs.h> 70156952Sume 71156952Sume#include "port_after.h" 72156952Sume 73156952Sumeconst char *h_errlist[] = { 74156952Sume "Resolver Error 0 (no error)", 75156952Sume "Unknown host", /* 1 HOST_NOT_FOUND */ 76156952Sume "Host name lookup failure", /* 2 TRY_AGAIN */ 77156952Sume "Unknown server error", /* 3 NO_RECOVERY */ 78156952Sume "No address associated with name", /* 4 NO_ADDRESS */ 79156952Sume}; 80156952Sumeint h_nerr = { sizeof h_errlist / sizeof h_errlist[0] }; 81156952Sume 82156952Sume#if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) 83156952Sume#undef h_errno 84156952Sumeint h_errno; 85156952Sume#endif 86156952Sume 87156952Sume/* 88156952Sume * herror -- 89156952Sume * print the error indicated by the h_errno value. 90156952Sume */ 91156952Sumevoid 92156952Sumeherror(const char *s) { 93156952Sume struct iovec iov[4], *v = iov; 94156952Sume char *t; 95156952Sume 96156952Sume if (s != NULL && *s != '\0') { 97156952Sume DE_CONST(s, t); 98156952Sume v->iov_base = t; 99156952Sume v->iov_len = strlen(t); 100156952Sume v++; 101156952Sume DE_CONST(": ", t); 102156952Sume v->iov_base = t; 103156952Sume v->iov_len = 2; 104156952Sume v++; 105156952Sume } 106156952Sume DE_CONST(hstrerror(*__h_errno()), t); 107156952Sume v->iov_base = t; 108156952Sume v->iov_len = strlen(v->iov_base); 109156952Sume v++; 110156952Sume DE_CONST("\n", t); 111156952Sume v->iov_base = t; 112156952Sume v->iov_len = 1; 113156952Sume writev(STDERR_FILENO, iov, (v - iov) + 1); 114156952Sume} 115156952Sume 116156952Sume/* 117156952Sume * hstrerror -- 118156952Sume * return the string associated with a given "host" errno value. 119156952Sume */ 120156952Sumeconst char * 121156952Sumehstrerror(int err) { 122156952Sume if (err < 0) 123156952Sume return ("Resolver internal error"); 124156952Sume else if (err < h_nerr) 125156952Sume return (h_errlist[err]); 126156952Sume return ("Unknown resolver error"); 127156952Sume} 128