lib/getfullhostname.c

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