1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * autod_lookup.c 24 * 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <stdio.h> 32 #include <ctype.h> 33 #include <string.h> 34 #include <syslog.h> 35 #include <errno.h> 36 #include <locale.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <assert.h> 40 #include "automount.h" 41 42 int 43 do_lookup1(mapname, key, subdir, mapopts, path, isdirect, action, linkp, cred) 44 char *mapname; 45 char *key; 46 char *subdir; 47 char *mapopts; 48 char *path; 49 uint_t isdirect; 50 enum autofs_action *action; 51 struct linka *linkp; 52 struct authunix_parms *cred; 53 { 54 struct mapline ml; 55 struct mapent *mapents = NULL; 56 int err; 57 struct rddir_cache *rdcp; 58 int found = 0; 59 bool_t iswildcard = FALSE; 60 bool_t isrestricted = hasrestrictopt(mapopts); 61 char *stack[STACKSIZ]; 62 char **stkptr = stack; 63 64 #ifdef lint 65 path = path; 66 #endif /* lint */ 67 68 /* 69 * Default action is for no work to be done by kernel AUTOFS. 70 */ 71 *action = AUTOFS_NONE; 72 73 /* 74 * Is there a cache for this map? 75 */ 76 rw_rdlock(&rddir_cache_lock); 77 err = rddir_cache_lookup(mapname, &rdcp); 78 if (!err && rdcp->full) { 79 rw_unlock(&rddir_cache_lock); 80 /* 81 * Try to lock readdir cache entry for reading, if 82 * the entry can not be locked, then avoid blocking 83 * and go to the name service. I'm assuming it is 84 * faster to go to the name service than to wait for 85 * the cache to be populated. 86 */ 87 if (rw_tryrdlock(&rdcp->rwlock) == 0) { 88 found = (rddir_entry_lookup(key, rdcp->entp) != NULL); 89 rw_unlock(&rdcp->rwlock); 90 } 91 } else 92 rw_unlock(&rddir_cache_lock); 93 94 if (!err) { 95 /* 96 * release reference on cache entry 97 */ 98 mutex_lock(&rdcp->lock); 99 rdcp->in_use--; 100 assert(rdcp->in_use >= 0); 101 mutex_unlock(&rdcp->lock); 102 } 103 104 if (found) 105 return (0); 106 107 /* 108 * entry not found in cache, try the name service now 109 */ 110 err = 0; 111 112 /* initialize the stack of open files for this thread */ 113 stack_op(INIT, NULL, stack, &stkptr); 114 115 err = getmapent(key, mapname, &ml, stack, &stkptr, &iswildcard, 116 isrestricted); 117 if (err == 0) /* call parser w default mount_access = TRUE */ 118 mapents = parse_entry(key, mapname, mapopts, &ml, 119 subdir, isdirect, TRUE); 120 121 /* 122 * Now we indulge in a bit of hanky-panky. 123 * If the entry isn't found in the map and the 124 * name begins with an "=" then we assume that 125 * the name is an undocumented control message 126 * for the daemon. This is accessible only 127 * to superusers. 128 */ 129 if (mapents == NULL && *action == AUTOFS_NONE) { 130 if (*key == '=' && cred->aup_uid == 0) { 131 if (isdigit(*(key+1))) { 132 /* 133 * If next character is a digit 134 * then set the trace level. 135 */ 136 trace = atoi(key+1); 137 trace_prt(1, "Automountd: trace level = %d\n", 138 trace); 139 } else if (*(key+1) == 'v') { 140 /* 141 * If it's a "v" then 142 * toggle verbose mode. 143 */ 144 verbose = !verbose; 145 trace_prt(1, "Automountd: verbose %s\n", 146 verbose ? "on" : "off"); 147 } 148 } 149 150 err = ENOENT; 151 goto done; 152 } 153 154 /* 155 * Each mapent in the list describes a mount to be done. 156 * Since I'm only doing a lookup, I only care whether a mapentry 157 * was found or not. The mount will be done on a later RPC to 158 * do_mount1. 159 */ 160 if (mapents == NULL && *action == AUTOFS_NONE) 161 err = ENOENT; 162 163 done: if (mapents) 164 free_mapent(mapents); 165 166 if (*action == AUTOFS_NONE && (iswildcard == TRUE)) { 167 *action = AUTOFS_MOUNT_RQ; 168 } 169 if (trace > 1) { 170 trace_prt(1, " do_lookup1: action=%d wildcard=%s error=%d\n", 171 *action, iswildcard ? "TRUE" : "FALSE", err); 172 } 173 return (err); 174 } 175