1 /* $NetBSD: info_hesiod.c,v 1.1.1.2 2009/03/20 20:26:49 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 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. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/amd/info_hesiod.c 43 * 44 */ 45 46 /* 47 * Get info from Hesiod 48 */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif /* HAVE_CONFIG_H */ 53 #include <am_defs.h> 54 #include <amd.h> 55 #include <sun_map.h> 56 57 #define HES_PREFIX "hesiod." 58 #define HES_PREFLEN 7 59 60 #ifdef HAVE_HESIOD_INIT 61 /* bsdi3 does not define this extern in any header file */ 62 extern char **hesiod_resolve(void *context, const char *name, const char *type); 63 extern int hesiod_init(void **context); 64 static voidp hesiod_context; 65 #endif /* HAVE_HESIOD_INIT */ 66 67 /* forward declarations */ 68 int amu_hesiod_init(mnt_map *m, char *map, time_t *tp); 69 int hesiod_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); 70 int hesiod_isup(mnt_map *m, char *map); 71 72 /* 73 * No easy way to probe the server - check the map name begins with "hesiod." 74 * Note: this name includes 'amu_' so as to not conflict with libhesiod's 75 * hesiod_init() function. 76 */ 77 int 78 amu_hesiod_init(mnt_map *m, char *map, time_t *tp) 79 { 80 dlog("amu_hesiod_init(%s)", map); 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 dlog("hesiod_search(m=%lx, map=%s, key=%s, pval=%lx tp=%lx)", 106 (unsigned long) m, map, key, (unsigned long) pval, (unsigned long) tp); 107 108 if (key[0] == '.') 109 return ENOENT; 110 111 xsnprintf(hes_key, sizeof(hes_key), "%s.%s", key, map + HES_PREFLEN); 112 113 /* 114 * Call the resolver 115 */ 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 (amuDebug(D_INFO)) 119 _res.options |= RES_DEBUG; 120 121 #ifdef HAVE_HESIOD_INIT 122 /* new style hesiod */ 123 rvec = hesiod_resolve(hesiod_context, hes_key, gopt.hesiod_base); 124 #else /* not HAVE_HESIOD_INIT */ 125 rvec = hes_resolve(hes_key, gopt.hesiod_base); 126 #endif /* not HAVE_HESIOD_INIT */ 127 128 /* 129 * If a reply was forthcoming then return 130 * it (and free subsequent replies) 131 */ 132 if (rvec && *rvec) { 133 if (m->cfm && (m->cfm->cfm_flags & CFM_SUN_MAP_SYNTAX)) { 134 *pval = sun_entry2amd(key, *rvec); 135 XFREE(*rvec); 136 } else 137 *pval = *rvec; 138 while (*++rvec) 139 XFREE(*rvec); 140 return 0; 141 } 142 143 #ifdef HAVE_HESIOD_INIT 144 /* new style hesiod */ 145 return errno; 146 #else /* not HAVE_HESIOD_INIT */ 147 /* 148 * Otherwise reflect the hesiod error into a Un*x error 149 */ 150 dlog("hesiod_search: Error: %d", hes_error()); 151 switch (hes_error()) { 152 case HES_ER_NOTFOUND: 153 error = ENOENT; 154 break; 155 case HES_ER_CONFIG: 156 error = EIO; 157 break; 158 case HES_ER_NET: 159 error = ETIMEDOUT; 160 break; 161 default: 162 error = EINVAL; 163 break; 164 } 165 dlog("hesiod_search: Returning: %d", error); 166 return error; 167 #endif /* not HAVE_HESIOD_INIT */ 168 } 169 170 171 /* 172 * Check if Hesiod is up, so we can determine if to clear the map or not. 173 * Test it by querying for /defaults. 174 * Returns: 0 if Hesiod is down, 1 if it is up. 175 */ 176 int 177 hesiod_isup(mnt_map *m, char *map) 178 { 179 int error; 180 char *val; 181 time_t mtime; 182 static int last_status = 1; /* assume up by default */ 183 184 error = hesiod_search(m, map, "/defaults", &val, &mtime); 185 dlog("hesiod_isup(%s): %s", map, strerror(error)); 186 if (error != 0 && error != ENOENT) { 187 plog(XLOG_ERROR, 188 "hesiod_isup: error getting `/defaults' entry in map %s: %m", map); 189 last_status = 0; 190 return 0; /* Hesiod is down */ 191 } 192 if (last_status == 0) { /* if was down before */ 193 plog(XLOG_INFO, "hesiod_isup: Hesiod came back up for map %s", map); 194 last_status = 1; 195 } 196 return 1; /* Hesiod is up */ 197 } 198