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Diffstat (limited to 'lib/lwres/herror.c')
| -rw-r--r-- | lib/lwres/herror.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/lib/lwres/herror.c b/lib/lwres/herror.c new file mode 100644 index 0000000..cf5b892 --- /dev/null +++ b/lib/lwres/herror.c @@ -0,0 +1,122 @@ +/* + * Portions Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") + * Portions Copyright (C) 2000, 2001, 2003 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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: herror.c,v 1.17 2007/06/19 23:47:22 tbox Exp $"; +#endif /* LIBC_SCCS and not lint */ + +#include <config.h> + +#include <stdio.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"); +} |