contrib/amd/amd/info_hesiod.c

   1 /*
   2  * Copyright (c) 1997-1999 Erez Zadok
   3  * Copyright (c) 1989 Jan-Simon Pendry
   4  * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
   5  * Copyright (c) 1989 The Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Jan-Simon Pendry at Imperial College, London.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgment:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      %W% (Berkeley) %G%
  40  *
  41  * $Id: info_hesiod.c,v 1.5 1999/02/04 07:24:15 ezk Exp $
  42  *
  43  */
  44
  45 /*
  46  * Get info from Hesiod
  47  */
  48
  49 #ifdef HAVE_CONFIG_H
  50 # include <config.h>
  51 #endif /* HAVE_CONFIG_H */
  52 #include <am_defs.h>
  53 #include <amd.h>
  54
  55 #define HES_PREFIX      "hesiod."
  56 #define HES_PREFLEN     7
  57
  58 #ifdef HAVE_HESIOD_INIT
  59 /* bsdi3 does not define this extern in any header file */
  60 extern char **hesiod_resolve(void *context, const char *name, const char *type);
  61 extern int hesiod_init(void **context);
  62 static voidp hesiod_context;
  63 #endif /* HAVE_HESIOD_INIT */
  64
  65 /* forward declarations */
  66 int amu_hesiod_init(mnt_map *m, char *map, time_t *tp);
  67 int hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
  68 int hesiod_isup(mnt_map *m, char *map);
  69
  70 /*
  71  * No easy way to probe the server - check the map name begins with "hesiod."
  72  * Note: this name includes 'amu_' so as to not conflict with libhesiod's
  73  * hesiod_init() function.
  74  */
  75 int
  76 amu_hesiod_init(mnt_map *m, char *map, time_t *tp)
  77 {
  78 #ifdef DEBUG
  79   dlog("amu_hesiod_init(%s)", map);
  80 #endif /* DEBUG */
  81   *tp = 0;
  82
  83 #ifdef HAVE_HESIOD_INIT
  84   if(!hesiod_context && hesiod_init(&hesiod_context) != 0)
  85     return ENOENT;
  86 #endif /* HAVE_HESIOD_INIT */
  87
  88   return NSTREQ(map, HES_PREFIX, HES_PREFLEN) ? 0 : ENOENT;
  89 }
  90
  91
  92 /*
  93  * Do a Hesiod nameserver call.
  94  * Modify time is ignored by Hesiod - XXX
  95  */
  96 int
  97 hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
  98 {
  99   char hes_key[MAXPATHLEN];
 100   char **rvec;
 101 #ifndef HAVE_HESIOD_INIT
 102   int error;
 103 #endif /* not HAVE_HESIOD_INIT */
 104
 105 #ifdef DEBUG
 106   dlog("hesiod_search(m=%lx, map=%s, key=%s, pval=%lx tp=%lx)",
 107        (unsigned long) m, map, key, (unsigned long) pval, (unsigned long) tp);
 108 #endif /* DEBUG */
 109
 110   sprintf(hes_key, "%s.%s", key, map + HES_PREFLEN);
 111
 112   /*
 113    * Call the resolver
 114    */
 115 #ifdef DEBUG
 116   dlog("Hesiod base is: %s\n", gopt.hesiod_base);
 117   dlog("hesiod_search: hes_resolve(%s, %s)", hes_key, gopt.hesiod_base);
 118   if (debug_flags & D_INFO)
 119     _res.options |= RES_DEBUG;
 120 #endif /* DEBUG */
 121
 122 #ifdef HAVE_HESIOD_INIT
 123   /* new style hesiod */
 124   rvec = hesiod_resolve(hesiod_context, hes_key, gopt.hesiod_base);
 125 #else /* not HAVE_HESIOD_INIT */
 126   rvec = hes_resolve(hes_key, gopt.hesiod_base);
 127 #endif /* not HAVE_HESIOD_INIT */
 128
 129   /*
 130    * If a reply was forthcoming then return
 131    * it (and free subsequent replies)
 132    */
 133   if (rvec && *rvec) {
 134     *pval = *rvec;
 135     while (*++rvec)
 136       XFREE(*rvec);
 137     return 0;
 138   }
 139
 140 #ifdef HAVE_HESIOD_INIT
 141   /* new style hesiod */
 142   return errno;
 143 #else /* not HAVE_HESIOD_INIT */
 144   /*
 145    * Otherwise reflect the hesiod error into a Un*x error
 146    */
 147 # ifdef DEBUG
 148   dlog("hesiod_search: Error: %d", hes_error());
 149 # endif /* DEBUG */
 150   switch (hes_error()) {
 151   case HES_ER_NOTFOUND:
 152     error = ENOENT;
 153     break;
 154   case HES_ER_CONFIG:
 155     error = EIO;
 156     break;
 157   case HES_ER_NET:
 158     error = ETIMEDOUT;
 159     break;
 160   default:
 161     error = EINVAL;
 162     break;
 163   }
 164 # ifdef DEBUG
 165   dlog("hesiod_search: Returning: %d", error);
 166 # endif /* DEBUG */
 167   return error;
 168 #endif /* not HAVE_HESIOD_INIT */
 169 }
 170
 171
 172 /*
 173  * Check if Hesiod is up, so we can determine if to clear the map or not.
 174  * Test it by querying for /defaults.
 175  * Returns: 0 if Hesiod is down, 1 if it is up.
 176  */
 177 int
 178 hesiod_isup(mnt_map *m, char *map)
 179 {
 180   int error;
 181   char *val;
 182   time_t mtime;
 183   static int last_status = 1;   /* assume up by default */
 184
 185   error = hesiod_search(m, map, "/defaults", &val, &mtime);
 186 #ifdef DEBUG
 187   dlog("hesiod_isup(%s): %s", map, strerror(error));
 188 #endif /* DEBUG */
 189   if (error != 0 && error != ENOENT) {
 190     plog(XLOG_ERROR,
 191          "hesiod_isup: error getting `/defaults' entry in map %s: %m", map);
 192     last_status = 0;
 193     return 0;                   /* Hesiod is down */
 194   }
 195   if (last_status == 0) {       /* if was down before */
 196     plog(XLOG_INFO, "hesiod_isup: Hesiod came back up for map %s", map);
 197     last_status = 1;
 198   }
 199   return 1;                     /* Hesiod is up */
 200 }