lib/getfullhostname.c

   1 /*
   2  * $Id$
   3  *
   4  * DEBUG:
   5  * AUTHOR: Harvest Derived
   6  *
   7  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   8  * ----------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from
  11  *  the Internet community; see the CONTRIBUTORS file for full
  12  *  details.   Many organizations have provided support for Squid's
  13  *  development; see the SPONSORS file for full details.  Squid is
  14  *  Copyrighted (C) 2001 by the Regents of the University of
  15  *  California; see the COPYRIGHT file for full details.  Squid
  16  *  incorporates software developed and/or copyrighted by other
  17  *  sources; see the CREDITS file for full details.
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  32  *
  33  */
  34 #include "getfullhostname.h"
  35
  36
  37 #if HAVE_UNISTD_H
  38 /* for gethostname() function */
  39 #include <unistd.h>
  40 #endif
  41 #if HAVE_NETDB_H
  42 /* for gethostbyname() */
  43 #include <netdb.h>
  44 #endif
  45
  46 /* for RFC 2181 constants */
  47 #include "rfc2181.h"
  48
  49 /* for xstrncpy() - may need breaking out of there. */
  50 #include "util.h"
  51
  52 /**
  53  \retval NULL  An error occured.
  54  \retval *    The fully qualified name (FQDN) of the current host.
  55  *            Pointer is only valid until the next call to the gethost*() functions.
  56  *
  57  \todo Make this a squid String result so the duration limit is flexible.
  58  */
  59 const char *
  60 getfullhostname(void)
  61 {
  62     const struct hostent *hp = NULL;
  63     static char buf[RFC2181_MAXHOSTNAMELEN + 1];
  64
  65     if (gethostname(buf, RFC2181_MAXHOSTNAMELEN) < 0)
  66         return NULL;
  67     /** \todo convert this to a xgetaddrinfo() call */
  68     if ((hp = gethostbyname(buf)) != NULL)
  69         xstrncpy(buf, hp->h_name, RFC2181_MAXHOSTNAMELEN);
  70     return buf;
  71 }