lib/getfullhostname.c

   1
   2 /*
   3  * $Id: getfullhostname.c,v 1.20 2003/01/23 00:37:01 robertc Exp $
   4  *
   5  * DEBUG:
   6  * AUTHOR: Harvest Derived
   7  *
   8  * SQUID Web Proxy Cache          http://www.squid-cache.org/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from
  12  *  the Internet community; see the CONTRIBUTORS file for full
  13  *  details.   Many organizations have provided support for Squid's
  14  *  development; see the SPONSORS file for full details.  Squid is
  15  *  Copyrighted (C) 2001 by the Regents of the University of
  16  *  California; see the COPYRIGHT file for full details.  Squid
  17  *  incorporates software developed and/or copyrighted by other
  18  *  sources; see the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include "config.h"
  37
  38 #if HAVE_LIBC_H
  39 #include <libc.h>
  40 #endif
  41 #if HAVE_STDIO_H
  42 #include <stdio.h>
  43 #endif
  44 #if HAVE_STDLIB_H
  45 #include <stdlib.h>
  46 #endif
  47 #if HAVE_STRING_H
  48 #include <string.h>
  49 #endif
  50 #if HAVE_SYS_PARAM_H
  51 #include <sys/param.h>
  52 #endif
  53 #if HAVE_SYS_TYPES_H
  54 #include <sys/types.h>
  55 #endif
  56 #if HAVE_SYS_SOCKET_H
  57 #include <sys/socket.h>
  58 #endif
  59 #if HAVE_NETINET_IN_H
  60 #include <netinet/in.h>
  61 #endif
  62 #if HAVE_ARPA_INET_H
  63 #include <arpa/inet.h>
  64 #endif
  65 #if HAVE_NETDB_H && !defined(_SQUID_NETDB_H_)   /* protect on NEXTSTEP */
  66 #define _SQUID_NETDB_H_
  67 #include <netdb.h>
  68 #endif
  69 #if HAVE_UNISTD_H
  70 #include <unistd.h>
  71 #endif
  72
  73 #include "util.h"
  74
  75 /*
  76  *  getfullhostname() - Returns the fully qualified name of the current
  77  *  host, or NULL on error.  Pointer is only valid until the next call
  78  *  to the gethost*() functions.
  79  */
  80 const char *
  81 getfullhostname(void)
  82 {
  83     const struct hostent *hp = NULL;
  84     static char buf[SQUIDHOSTNAMELEN + 1];
  85
  86     if (gethostname(buf, SQUIDHOSTNAMELEN) < 0)
  87         return NULL;
  88     if ((hp = gethostbyname(buf)) != NULL)
  89         xstrncpy(buf, hp->h_name, SQUIDHOSTNAMELEN);
  90     return buf;
  91 }