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      1 /*	$NetBSD: info_hesiod.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997-2014 Erez Zadok
      5  * Copyright (c) 1989 Jan-Simon Pendry
      6  * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
      7  * Copyright (c) 1989 The Regents of the University of California.
      8  * All rights reserved.
      9  *
     10  * This code is derived from software contributed to Berkeley by
     11  * Jan-Simon Pendry at Imperial College, London.
     12  *
     13  * Redistribution and use in source and binary forms, with or without
     14  * modification, are permitted provided that the following conditions
     15  * are met:
     16  * 1. Redistributions of source code must retain the above copyright
     17  *    notice, this list of conditions and the following disclaimer.
     18  * 2. Redistributions in binary form must reproduce the above copyright
     19  *    notice, this list of conditions and the following disclaimer in the
     20  *    documentation and/or other materials provided with the distribution.
     21  * 3. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *
     38  * File: am-utils/amd/info_hesiod.c
     39  *
     40  */
     41 
     42 /*
     43  * Get info from Hesiod
     44  */
     45 
     46 #ifdef HAVE_CONFIG_H
     47 # include <config.h>
     48 #endif /* HAVE_CONFIG_H */
     49 #include <am_defs.h>
     50 #include <amd.h>
     51 #include <sun_map.h>
     52 
     53 #define	HES_PREFIX	"hesiod."
     54 #define	HES_PREFLEN	7
     55 
     56 #ifdef HAVE_HESIOD_INIT
     57 /* bsdi3 does not define this extern in any header file */
     58 extern char **hesiod_resolve(void *context, const char *name, const char *type);
     59 extern int hesiod_init(void **context);
     60 static voidp hesiod_context;
     61 #endif /* HAVE_HESIOD_INIT */
     62 
     63 /* forward declarations */
     64 int amu_hesiod_init(mnt_map *m, char *map, time_t *tp);
     65 int hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
     66 int hesiod_isup(mnt_map *m, char *map);
     67 
     68 /*
     69  * No easy way to probe the server - check the map name begins with "hesiod."
     70  * Note: this name includes 'amu_' so as to not conflict with libhesiod's
     71  * hesiod_init() function.
     72  */
     73 int
     74 amu_hesiod_init(mnt_map *m, char *map, time_t *tp)
     75 {
     76   dlog("amu_hesiod_init(%s)", map);
     77   *tp = 0;
     78 
     79 #ifdef HAVE_HESIOD_INIT
     80   if (!hesiod_context && hesiod_init(&hesiod_context) != 0)
     81     return ENOENT;
     82 #endif /* HAVE_HESIOD_INIT */
     83 
     84   return NSTREQ(map, HES_PREFIX, HES_PREFLEN) ? 0 : ENOENT;
     85 }
     86 
     87 
     88 /*
     89  * Do a Hesiod nameserver call.
     90  * Modify time is ignored by Hesiod - XXX
     91  */
     92 int
     93 hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
     94 {
     95   char hes_key[MAXPATHLEN];
     96   char **rvec;
     97 #ifndef HAVE_HESIOD_INIT
     98   int error;
     99 #endif /* not HAVE_HESIOD_INIT */
    100 
    101   dlog("hesiod_search(m=%lx, map=%s, key=%s, pval=%lx tp=%lx)",
    102        (unsigned long) m, map, key, (unsigned long) pval, (unsigned long) tp);
    103 
    104   if (key[0] == '.')
    105     return ENOENT;
    106 
    107   xsnprintf(hes_key, sizeof(hes_key), "%s.%s", key, map + HES_PREFLEN);
    108 
    109   /*
    110    * Call the resolver
    111    */
    112   dlog("Hesiod base is: %s\n", gopt.hesiod_base);
    113   dlog("hesiod_search: hes_resolve(%s, %s)", hes_key, gopt.hesiod_base);
    114   if (amuDebug(D_INFO))
    115     _res.options |= RES_DEBUG;
    116 
    117 #ifdef HAVE_HESIOD_INIT
    118   /* new style hesiod */
    119   rvec = hesiod_resolve(hesiod_context, hes_key, gopt.hesiod_base);
    120 #else /* not HAVE_HESIOD_INIT */
    121   rvec = hes_resolve(hes_key, gopt.hesiod_base);
    122 #endif /* not HAVE_HESIOD_INIT */
    123 
    124   /*
    125    * If a reply was forthcoming then return
    126    * it (and free subsequent replies)
    127    */
    128   if (rvec && *rvec) {
    129     if (m->cfm && (m->cfm->cfm_flags & CFM_SUN_MAP_SYNTAX)) {
    130       *pval = sun_entry2amd(key, *rvec);
    131       XFREE(*rvec);
    132     } else
    133       *pval = *rvec;
    134     while (*++rvec)
    135       XFREE(*rvec);
    136     return 0;
    137   }
    138 
    139 #ifdef HAVE_HESIOD_INIT
    140   /* new style hesiod */
    141   return errno;
    142 #else /* not HAVE_HESIOD_INIT */
    143   /*
    144    * Otherwise reflect the hesiod error into a Un*x error
    145    */
    146   dlog("hesiod_search: Error: %d", hes_error());
    147   switch (hes_error()) {
    148   case HES_ER_NOTFOUND:
    149     error = ENOENT;
    150     break;
    151   case HES_ER_CONFIG:
    152     error = EIO;
    153     break;
    154   case HES_ER_NET:
    155     error = ETIMEDOUT;
    156     break;
    157   default:
    158     error = EINVAL;
    159     break;
    160   }
    161   dlog("hesiod_search: Returning: %d", error);
    162   return error;
    163 #endif /* not HAVE_HESIOD_INIT */
    164 }
    165 
    166 
    167 /*
    168  * Check if Hesiod is up, so we can determine if to clear the map or not.
    169  * Test it by querying for /defaults.
    170  * Returns: 0 if Hesiod is down, 1 if it is up.
    171  */
    172 int
    173 hesiod_isup(mnt_map *m, char *map)
    174 {
    175   int error;
    176   char *val;
    177   time_t mtime;
    178   static int last_status = 1;	/* assume up by default */
    179 
    180   error = hesiod_search(m, map, "/defaults", &val, &mtime);
    181   dlog("hesiod_isup(%s): %s", map, strerror(error));
    182   if (error != 0 && error != ENOENT) {
    183     plog(XLOG_ERROR,
    184 	 "hesiod_isup: error getting `/defaults' entry in map %s: %m", map);
    185     last_status = 0;
    186     return 0;			/* Hesiod is down */
    187   }
    188   if (last_status == 0) {	/* if was down before */
    189     plog(XLOG_INFO, "hesiod_isup: Hesiod came back up for map %s", map);
    190     last_status = 1;
    191   }
    192   return 1;			/* Hesiod is up */
    193 }
    194