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