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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _MAPID_H 27 #define _MAPID_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 #include <string.h> 39 #include <strings.h> 40 #include <sys/types.h> 41 #include <sys/stat.h> 42 #include <rpc/types.h> 43 #include <netinet/in.h> 44 #include <arpa/nameser.h> 45 #include <resolv.h> 46 #include <netdb.h> 47 #include <errno.h> 48 #include <ctype.h> 49 #include <sys/socket.h> 50 #include <arpa/inet.h> 51 #include <assert.h> 52 #include <synch.h> 53 #include <syslog.h> 54 #include <locale.h> 55 #include <thread.h> 56 #include <deflt.h> 57 #include <nfs/nfs4.h> 58 59 #define DNAMEMAX (NS_MAXCDNAME + 1) 60 61 typedef struct { 62 void *(*fcn)(void *); 63 int signal; 64 } cb_t; 65 66 #ifdef __LIBMAPID_IMPL 67 68 /* 69 * Error Messages 70 */ 71 #define EMSG_NETDB_INTERNAL "Internal Resolver Error: %s" 72 73 #define EMSG_TRY_AGAIN "\"%s\" DNS nameserver(s) not responding" \ 74 "...\tRetrying" 75 76 #define EMSG_NO_RECOVERY "Unrecoverable Resolver Error: %s" 77 78 #define EMSG_HOST_NOT_FOUND "Authoritative nameserver unresponsive " \ 79 "to queries for domain \"%s\"" 80 81 #define EMSG_NO_DATA "\"%s\" DNS TXT record not found: "\ 82 "Defaulting to \"%s\"" 83 84 #define EMSG_DNS_THREAD_ERROR "Unable to create DNS query thread" 85 86 #define EMSG_DNS_DISABLE "%s: Further DNS queries disabled !" 87 88 #define EMSG_DNS_RR_INVAL "\"%s\" Invalid DNS TXT record: "\ 89 "Defaulting to \"%s\"" 90 91 /* 92 * DNS related info 93 */ 94 #define NFSMAPID_DNS_RR "_nfsv4idmapdomain" 95 #define NFSMAPID_DNS_TOUT_SECS (30LL) 96 #define NFSMAPID_SLOG_RATE 20 /* ~10 mins */ 97 98 #define NS_ERRS 6 /* netdb.h */ 99 100 typedef union { 101 HEADER hdr; 102 uchar_t buf[PACKETSZ]; 103 } ans_t; 104 105 /* 106 * NOTE: All s_ prefixed variables are only to be used by the DNS 107 * feature implementation (mapid.c). The exported globals 108 * (ie. seen by nfsmapid.c/nfsmapid_server.c) are the 109 * dns_ prefixed variables along with sysdns_domain. 110 */ 111 static ans_t s_ans; 112 static int s_anslen; 113 static char s_dname[DNAMEMAX] = {0}; 114 static char s_txt_rr[DNAMEMAX] = {0}; 115 116 static rwlock_t s_dns_data_lock = DEFAULTRWLOCK; 117 static rwlock_t s_dns_impl_lock = DEFAULTRWLOCK; 118 static mutex_t s_res_lock = ERRORCHECKMUTEX; 119 static uint32_t s_dns_tout = 0; 120 static thread_t s_dns_qthread; 121 static bool_t s_dns_qthr_created = FALSE; 122 static bool_t s_dns_disabled = FALSE; 123 static struct __res_state s_res = {0}; 124 static thread_key_t s_thr_key; 125 int lib_init_done = 0; 126 127 static int resolv_init(void); 128 static void resolv_decode(void); 129 static int resolv_error(void); 130 static void resolv_get_txt_data(void); 131 static void resolv_txt_reset(void); 132 static void resolve_process_txt(uchar_t *, int); 133 static int resolv_search(void); 134 static uchar_t *resolv_skip_rr(uchar_t *, uchar_t *); 135 static void domain_sync(cb_t *, char *); 136 static int get_mtime(const char *, timestruc_t *); 137 static void get_nfs_domain(void); 138 static void get_dns_domain(void); 139 static void get_dns_txt_domain(cb_t *); 140 void _lib_init(void); 141 142 #ifdef DEBUG 143 bool_t nfsmapid_debug = FALSE; 144 #endif /* DEBUG */ 145 146 /* 147 * mapid_domain_lock: rwlock used to serialize access/changes 148 * to the library's mapid_domain global var. 149 * 150 * mapid_domain: Library variable used to store the current 151 * domain configured for use in decoding/encoding 152 * outbound and inbound attr strings, accordingly. 153 * 154 * nfs_domain: If /etc/default/nfs NFSMAPID_DOMAIN var 155 * has been set, nfs_domain will hold this 156 * value for the duration of the instance; 157 * If the value ever changes, the change is 158 * detected via the use of nfs_mtime and 159 * nfs_domain is updated accordingly. 160 * 161 * dns_domain: If the system's resolver (/etc/resolv.conf) 162 * has been configured, dns_domain will hold 163 * the configured DNS domain as reported by the 164 * res_ninit() resolver interface. If the system's 165 * /etc/resolv.conf file is updated, the change 166 * is detected via the use of dns_mtime and 167 * dns_domain is updated accordingly. 168 */ 169 rwlock_t mapid_domain_lock = DEFAULTRWLOCK; 170 uint32_t mapid_domain_len = 0; 171 char mapid_domain[DNAMEMAX] = {0}; 172 173 timestruc_t nfs_mtime = {0}; 174 uint32_t nfs_domain_len = 0; 175 char nfs_domain[DNAMEMAX] = {0}; 176 177 timestruc_t dns_mtime = {0}; 178 uint32_t dns_domain_len = 0; 179 char dns_domain[DNAMEMAX] = {0}; 180 181 int dns_txt_cached = 0; 182 uint32_t dns_txt_domain_len = 0; 183 char dns_txt_domain[DNAMEMAX] = {0}; 184 char sysdns_domain[DNAMEMAX] = {0}; 185 186 timestruc_t zapped_mtime = {0}; 187 188 #define ZAP_DOMAIN(which) \ 189 { \ 190 bzero(which##_domain, DNAMEMAX);\ 191 which##_domain_len = 0; \ 192 which##_mtime = zapped_mtime; \ 193 } 194 195 #define TIMESTRUC_EQ(a, b) \ 196 (((a).tv_sec == (b).tv_sec) && \ 197 ((a).tv_nsec == (b).tv_nsec)) 198 199 200 201 #endif /* __LIBMAPID_IMPL */ 202 203 /* 204 * PSARC 2005/487 Consolidation Private Interfaces 205 * mapid_reeval_domain(), mapid_get_domain() 206 * Changes must be reviewed by Solaris File Sharing 207 */ 208 extern void mapid_reeval_domain(cb_t *); 209 extern char *mapid_get_domain(void); 210 211 /* 212 * PSARC 2005/487 Contracted Sun Private Interface 213 * mapid_derive_domain(), mapid_stdchk_domain() 214 * Changes must be reviewed by Solaris File Sharing 215 * Changes must be communicated to contract-2005-487-01@sun.com 216 */ 217 extern int mapid_stdchk_domain(const char *); 218 extern char *mapid_derive_domain(void); 219 220 #ifdef __cplusplus 221 } 222 #endif 223 224 #endif /* _MAPID_H */ 225