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Diffstat (limited to 'lib/lwres/herror.c')
| -rw-r--r-- | lib/lwres/herror.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/lwres/herror.c b/lib/lwres/herror.c new file mode 100644 index 0000000..25bd65e --- /dev/null +++ b/lib/lwres/herror.c @@ -0,0 +1,114 @@ +/* + * Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/* + * Copyright (c) 1987, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/*! \file herror.c + lwres_herror() prints the string s on stderr followed by the string + generated by lwres_hstrerror() for the error code stored in the global + variable lwres_h_errno. + + lwres_hstrerror() returns an appropriate string for the error code + gievn by err. The values of the error codes and messages are as + follows: + +\li #NETDB_SUCCESS: Resolver Error 0 (no error) + +\li #HOST_NOT_FOUND: Unknown host + +\li #TRY_AGAIN: Host name lookup failure + +\li #NO_RECOVERY: Unknown server error + +\li #NO_DATA: No address associated with name + + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93"; +static const char rcsid[] = + "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +#include <config.h> + +#include <stdio.h> + +#include <isc/print.h> + +#include <lwres/netdb.h> +#include <lwres/platform.h> + +LIBLWRES_EXTERNAL_DATA int lwres_h_errno; + +/*! + * these have never been declared in any header file so make them static + */ + +static const char *h_errlist[] = { + "Resolver Error 0 (no error)", /*%< 0 no error */ + "Unknown host", /*%< 1 HOST_NOT_FOUND */ + "Host name lookup failure", /*%< 2 TRY_AGAIN */ + "Unknown server error", /*%< 3 NO_RECOVERY */ + "No address associated with name", /*%< 4 NO_ADDRESS */ +}; + +static int h_nerr = sizeof(h_errlist) / sizeof(h_errlist[0]); + + +/*! + * herror -- + * print the error indicated by the h_errno value. + */ +void +lwres_herror(const char *s) { + fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno)); +} + +/*! + * hstrerror -- + * return the string associated with a given "host" errno value. + */ +const char * +lwres_hstrerror(int err) { + if (err < 0) + return ("Resolver internal error"); + else if (err < h_nerr) + return (h_errlist[err]); + return ("Unknown resolver error"); +} |