lib/getfullhostname.c

   1
   2 /*
   3  * $Id: getfullhostname.c,v 1.10 1996/10/19 08:21:54 wessels Exp $
   4  *
   5  * DEBUG:
   6  * AUTHOR: Harvest Derived
   7  *
   8  * SQUID Internet Object Cache  http://www.nlanr.net/Squid/
   9  * --------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from the
  12  *  Internet community.  Development is led by Duane Wessels of the
  13  *  National Laboratory for Applied Network Research and funded by
  14  *  the National Science Foundation.
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License as published by
  18  *  the Free Software Foundation; either version 2 of the License, or
  19  *  (at your option) any later version.
  20  *
  21  *  This program is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with this program; if not, write to the Free Software
  28  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29  *
  30  */
  31
  32
  33 /*
  34  * Copyright (c) 1994, 1995.  All rights reserved.
  35  *
  36  *   The Harvest software was developed by the Internet Research Task
  37  *   Force Research Group on Resource Discovery (IRTF-RD):
  38  *
  39  *         Mic Bowman of Transarc Corporation.
  40  *         Peter Danzig of the University of Southern California.
  41  *         Darren R. Hardy of the University of Colorado at Boulder.
  42  *         Udi Manber of the University of Arizona.
  43  *         Michael F. Schwartz of the University of Colorado at Boulder.
  44  *         Duane Wessels of the University of Colorado at Boulder.
  45  *
  46  *   This copyright notice applies to software in the Harvest
  47  *   ``src/'' directory only.  Users should consult the individual
  48  *   copyright notices in the ``components/'' subdirectories for
  49  *   copyright information about other software bundled with the
  50  *   Harvest source code distribution.
  51  *
  52  * TERMS OF USE
  53  *
  54  *   The Harvest software may be used and re-distributed without
  55  *   charge, provided that the software origin and research team are
  56  *   cited in any use of the system.  Most commonly this is
  57  *   accomplished by including a link to the Harvest Home Page
  58  *   (http://harvest.cs.colorado.edu/) from the query page of any
  59  *   Broker you deploy, as well as in the query result pages.  These
  60  *   links are generated automatically by the standard Broker
  61  *   software distribution.
  62  *
  63  *   The Harvest software is provided ``as is'', without express or
  64  *   implied warranty, and with no support nor obligation to assist
  65  *   in its use, correction, modification or enhancement.  We assume
  66  *   no liability with respect to the infringement of copyrights,
  67  *   trade secrets, or any patents, and are not responsible for
  68  *   consequential damages.  Proper use of the Harvest software is
  69  *   entirely the responsibility of the user.
  70  *
  71  * DERIVATIVE WORKS
  72  *
  73  *   Users may make derivative works from the Harvest software, subject
  74  *   to the following constraints:
  75  *
  76  *     - You must include the above copyright notice and these
  77  *       accompanying paragraphs in all forms of derivative works,
  78  *       and any documentation and other materials related to such
  79  *       distribution and use acknowledge that the software was
  80  *       developed at the above institutions.
  81  *
  82  *     - You must notify IRTF-RD regarding your distribution of
  83  *       the derivative work.
  84  *
  85  *     - You must clearly notify users that your are distributing
  86  *       a modified version and not the original Harvest software.
  87  *
  88  *     - Any derivative product is also subject to these copyright
  89  *       and use restrictions.
  90  *
  91  *   Note that the Harvest software is NOT in the public domain.  We
  92  *   retain copyright, as specified above.
  93  *
  94  * HISTORY OF FREE SOFTWARE STATUS
  95  *
  96  *   Originally we required sites to license the software in cases
  97  *   where they were going to build commercial products/services
  98  *   around Harvest.  In June 1995 we changed this policy.  We now
  99  *   allow people to use the core Harvest software (the code found in
 100  *   the Harvest ``src/'' directory) for free.  We made this change
 101  *   in the interest of encouraging the widest possible deployment of
 102  *   the technology.  The Harvest software is really a reference
 103  *   implementation of a set of protocols and formats, some of which
 104  *   we intend to standardize.  We encourage commercial
 105  *   re-implementations of code complying to this set of standards.
 106  */
 107
 108 #include "config.h"
 109
 110 #if HAVE_STDIO_H
 111 #include <stdio.h>
 112 #endif
 113 #if HAVE_STDLIB_H
 114 #include <stdlib.h>
 115 #endif
 116 #if HAVE_STRING_H
 117 #include <string.h>
 118 #endif
 119 #if HAVE_SYS_PARAM_H
 120 #include <sys/param.h>
 121 #endif
 122 #if HAVE_SYS_TYPES_H
 123 #include <sys/types.h>
 124 #endif
 125 #if HAVE_SYS_SOCKET_H
 126 #include <sys/socket.h>
 127 #endif
 128 #if HAVE_NETINET_IN_H
 129 #include <netinet/in.h>
 130 #endif
 131 #if HAVE_ARPA_INET_H
 132 #include <arpa/inet.h>
 133 #endif
 134 #if HAVE_NETDB_H && !defined(_SQUID_NETDB_H_)   /* protect on NEXTSTEP */
 135 #define _SQUID_NETDB_H_
 136 #include <netdb.h>
 137 #endif
 138 #if HAVE_UNISTD_H
 139 #include <unistd.h>
 140 #endif
 141
 142 #include "ansiproto.h"
 143 #include "util.h"
 144
 145 /*
 146  *  getfullhostname() - Returns the fully qualified name of the current
 147  *  host, or NULL on error.  Pointer is only valid until the next call
 148  *  to the gethost*() functions.
 149  */
 150 char *
 151 getfullhostname(void)
 152 {
 153     struct hostent *hp = NULL;
 154     static char buf[SQUIDHOSTNAMELEN + 1];
 155
 156     if (gethostname(buf, SQUIDHOSTNAMELEN) < 0)
 157         return NULL;
 158     if ((hp = gethostbyname(buf)) != NULL)
 159         strncpy(buf, hp->h_name, SQUIDHOSTNAMELEN);
 160     return buf;
 161 }