1/*
2 * Copyright (c) 1997-2006 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 *
40 * File: am-utils/amd/info_hesiod.c
41 *
42 */
43
44/*
45 * Get info from Hesiod
46 */
47
48#ifdef HAVE_CONFIG_H
49# include <config.h>
50#endif /* HAVE_CONFIG_H */
51#include <am_defs.h>
52#include <amd.h>
53
54#define	HES_PREFIX	"hesiod."
55#define	HES_PREFLEN	7
56
57#ifdef HAVE_HESIOD_INIT
58/* bsdi3 does not define this extern in any header file */
59extern char **hesiod_resolve(void *context, const char *name, const char *type);
60extern int hesiod_init(void **context);
61static voidp hesiod_context;
62#endif /* HAVE_HESIOD_INIT */
63
64/* forward declarations */
65int amu_hesiod_init(mnt_map *m, char *map, time_t *tp);
66int hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
67int hesiod_isup(mnt_map *m, char *map);
68
69/*
70 * No easy way to probe the server - check the map name begins with "hesiod."
71 * Note: this name includes 'amu_' so as to not conflict with libhesiod's
72 * hesiod_init() function.
73 */
74int
75amu_hesiod_init(mnt_map *m, char *map, time_t *tp)
76{
77  dlog("amu_hesiod_init(%s)", map);
78  *tp = 0;
79
80#ifdef HAVE_HESIOD_INIT
81  if (!hesiod_context && hesiod_init(&hesiod_context) != 0)
82    return ENOENT;
83#endif /* HAVE_HESIOD_INIT */
84
85  return NSTREQ(map, HES_PREFIX, HES_PREFLEN) ? 0 : ENOENT;
86}
87
88
89/*
90 * Do a Hesiod nameserver call.
91 * Modify time is ignored by Hesiod - XXX
92 */
93int
94hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
95{
96  char hes_key[MAXPATHLEN];
97  char **rvec;
98#ifndef HAVE_HESIOD_INIT
99  int error;
100#endif /* not HAVE_HESIOD_INIT */
101
102  dlog("hesiod_search(m=%lx, map=%s, key=%s, pval=%lx tp=%lx)",
103       (unsigned long) m, map, key, (unsigned long) pval, (unsigned long) tp);
104
105  if (key[0] == '.')
106    return ENOENT;
107
108  xsnprintf(hes_key, sizeof(hes_key), "%s.%s", key, map + HES_PREFLEN);
109
110  /*
111   * Call the resolver
112   */
113  dlog("Hesiod base is: %s\n", gopt.hesiod_base);
114  dlog("hesiod_search: hes_resolve(%s, %s)", hes_key, gopt.hesiod_base);
115  if (amuDebug(D_INFO))
116    _res.options |= RES_DEBUG;
117
118#ifdef HAVE_HESIOD_INIT
119  /* new style hesiod */
120  rvec = hesiod_resolve(hesiod_context, hes_key, gopt.hesiod_base);
121#else /* not HAVE_HESIOD_INIT */
122  rvec = hes_resolve(hes_key, gopt.hesiod_base);
123#endif /* not HAVE_HESIOD_INIT */
124
125  /*
126   * If a reply was forthcoming then return
127   * it (and free subsequent replies)
128   */
129  if (rvec && *rvec) {
130    *pval = *rvec;
131    while (*++rvec)
132      XFREE(*rvec);
133    return 0;
134  }
135
136#ifdef HAVE_HESIOD_INIT
137  /* new style hesiod */
138  return errno;
139#else /* not HAVE_HESIOD_INIT */
140  /*
141   * Otherwise reflect the hesiod error into a Un*x error
142   */
143  dlog("hesiod_search: Error: %d", hes_error());
144  switch (hes_error()) {
145  case HES_ER_NOTFOUND:
146    error = ENOENT;
147    break;
148  case HES_ER_CONFIG:
149    error = EIO;
150    break;
151  case HES_ER_NET:
152    error = ETIMEDOUT;
153    break;
154  default:
155    error = EINVAL;
156    break;
157  }
158  dlog("hesiod_search: Returning: %d", error);
159  return error;
160#endif /* not HAVE_HESIOD_INIT */
161}
162
163
164/*
165 * Check if Hesiod is up, so we can determine if to clear the map or not.
166 * Test it by querying for /defaults.
167 * Returns: 0 if Hesiod is down, 1 if it is up.
168 */
169int
170hesiod_isup(mnt_map *m, char *map)
171{
172  int error;
173  char *val;
174  time_t mtime;
175  static int last_status = 1;	/* assume up by default */
176
177  error = hesiod_search(m, map, "/defaults", &val, &mtime);
178  dlog("hesiod_isup(%s): %s", map, strerror(error));
179  if (error != 0 && error != ENOENT) {
180    plog(XLOG_ERROR,
181	 "hesiod_isup: error getting `/defaults' entry in map %s: %m", map);
182    last_status = 0;
183    return 0;			/* Hesiod is down */
184  }
185  if (last_status == 0) {	/* if was down before */
186    plog(XLOG_INFO, "hesiod_isup: Hesiod came back up for map %s", map);
187    last_status = 1;
188  }
189  return 1;			/* Hesiod is up */
190}
191