lib/getfullhostname.c

   1 /*
   2  * $Id: getfullhostname.c,v 1.20 2003/01/23 00:37:01 robertc Exp $
   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 #if 0 /* we SHOULD NOT need ALL these here. */
  37 #if HAVE_LIBC_H
  38 #include <libc.h>
  39 #endif
  40 #if HAVE_STDIO_H
  41 #include <stdio.h>
  42 #endif
  43 #if HAVE_STDLIB_H
  44 #include <stdlib.h>
  45 #endif
  46 #if HAVE_STRING_H
  47 #include <string.h>
  48 #endif
  49 #if HAVE_SYS_PARAM_H
  50 #include <sys/param.h>
  51 #endif
  52 #if HAVE_SYS_TYPES_H
  53 #include <sys/types.h>
  54 #endif
  55 #if HAVE_SYS_SOCKET_H
  56 #include <sys/socket.h>
  57 #endif
  58 #if HAVE_NETINET_IN_H
  59 #include <netinet/in.h>
  60 #endif
  61 #if HAVE_ARPA_INET_H
  62 #include <arpa/inet.h>
  63 #endif
  64
  65 #endif // 0
  66
  67
  68 #if HAVE_UNISTD_H
  69 /* for gethostname() function */
  70 #include <unistd.h>
  71 #endif
  72 #if HAVE_NETDB_H && !defined(_SQUID_NETDB_H_)   /* protect on NEXTSTEP */
  73 #define _SQUID_NETDB_H_
  74 /* for gethostbyname() */
  75 #include <netdb.h>
  76 #endif
  77
  78 /* for RFC 2181 constants */
  79 #include "rfc2181.h"
  80
  81 /* for xstrncpy() - may need breakign out of there. */
  82 #include "util.h"
  83
  84 /**
  85  \retval NULL  An error occured.
  86  \retval *    The fully qualified name (FQDN) of the current host.
  87  *            Pointer is only valid until the next call to the gethost*() functions.
  88  *
  89  \todo Make this a squid String result so the duration limit is flexible.
  90  */
  91 const char *
  92 getfullhostname(void)
  93 {
  94     const struct hostent *hp = NULL;
  95     static char buf[RFC2181_MAXHOSTNAMELEN + 1];
  96
  97     if (gethostname(buf, RFC2181_MAXHOSTNAMELEN) < 0)
  98         return NULL;
  99     /** \todo convert this to a xgetaddrinfo() call */
 100     if ((hp = gethostbyname(buf)) != NULL)
 101         xstrncpy(buf, hp->h_name, RFC2181_MAXHOSTNAMELEN);
 102     return buf;
 103 }