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      1 /*	$NetBSD: herror.c,v 1.10 2015/02/24 17:56:20 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. 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 <sys/cdefs.h>
     50 #if defined(LIBC_SCCS) && !defined(lint)
     51 #ifdef notdef
     52 static const char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
     53 static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
     54 #else
     55 __RCSID("$NetBSD: herror.c,v 1.10 2015/02/24 17:56:20 christos Exp $");
     56 #endif
     57 #endif /* LIBC_SCCS and not lint */
     58 
     59 #include "port_before.h"
     60 
     61 #include "namespace.h"
     62 #include <sys/types.h>
     63 #include <sys/param.h>
     64 #include <sys/uio.h>
     65 
     66 #include <netinet/in.h>
     67 #include <arpa/nameser.h>
     68 
     69 #include <netdb.h>
     70 #include <resolv.h>
     71 #include <string.h>
     72 #include <unistd.h>
     73 
     74 #include "port_after.h"
     75 
     76 const char *h_errlist[] = {
     77 	"Resolver Error 0 (no error)",
     78 	"Unknown host",				/*%< 1 HOST_NOT_FOUND */
     79 	"Host name lookup failure",		/*%< 2 TRY_AGAIN */
     80 	"Unknown server error",			/*%< 3 NO_RECOVERY */
     81 	"No address associated with name",	/*%< 4 NO_ADDRESS */
     82 };
     83 int	h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
     84 
     85 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
     86 #undef	h_errno
     87 int	h_errno;
     88 #endif
     89 
     90 #ifdef __weak_alias
     91 __weak_alias(herror,_herror)
     92 #endif
     93 
     94 /*%
     95  * herror --
     96  *	print the error indicated by the h_errno value.
     97  */
     98 void
     99 herror(const char *s) {
    100 	struct iovec iov[4], *v = iov;
    101 	char *t;
    102 
    103 	if (s != NULL && *s != '\0') {
    104 		DE_CONST(s, t);
    105 		v->iov_base = t;
    106 		v->iov_len = strlen(t);
    107 		v++;
    108 		DE_CONST(": ", t);
    109 		v->iov_base = t;
    110 		v->iov_len = 2;
    111 		v++;
    112 	}
    113 	DE_CONST(hstrerror(*__h_errno()), t);
    114 	v->iov_base = t;
    115 	v->iov_len = strlen(v->iov_base);
    116 	v++;
    117 	DE_CONST("\n", t);
    118 	v->iov_base = t;
    119 	v->iov_len = 1;
    120 	(void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
    121 }
    122 
    123 /*%
    124  * hstrerror --
    125  *	return the string associated with a given "host" errno value.
    126  */
    127 const char *
    128 hstrerror(int err) {
    129 	if (err < 0)
    130 		return ("Resolver internal error");
    131 	else if (err < h_nerr)
    132 		return (h_errlist[err]);
    133 	return ("Unknown resolver error");
    134 }
    135 
    136 /*! \file */
    137