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
amu_hesiod_init(mnt_map * m,char * map,time_t * tp)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
hesiod_search(mnt_map * m,char * map,char * key,char ** pval,time_t * tp)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
hesiod_isup(mnt_map * m,char * map)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