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 (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 25 #ifndef _MAPID_H 26 #define _MAPID_H 27 28 #ifdef __cplusplus 29 extern "C" { 30 #endif 31 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <string.h> 36 #include <strings.h> 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <rpc/types.h> 40 #include <netinet/in.h> 41 #include <arpa/nameser.h> 42 #include <resolv.h> 43 #include <netdb.h> 44 #include <errno.h> 45 #include <ctype.h> 46 #include <sys/socket.h> 47 #include <arpa/inet.h> 48 #include <assert.h> 49 #include <synch.h> 50 #include <syslog.h> 51 #include <locale.h> 52 #include <thread.h> 53 #include <deflt.h> 54 #include <nfs/nfs4.h> 55 56 #define DNAMEMAX (NS_MAXCDNAME + 1) 57 58 typedef struct { 59 void *(*fcn)(void *); 60 int signal; 61 } cb_t; 62 63 #ifdef __LIBMAPID_IMPL 64 65 /* 66 * Error Messages 67 */ 68 #define EMSG_NETDB_INTERNAL "Internal Resolver Error: %s" 69 70 #define EMSG_TRY_AGAIN "\"%s\" DNS nameserver(s) not responding" \ 71 "...\tRetrying" 72 73 #define EMSG_NO_RECOVERY "Unrecoverable Resolver Error: %s" 74 75 #define EMSG_HOST_NOT_FOUND "Authoritative nameserver unresponsive " \ 76 "to queries for domain \"%s\"" 77 78 #define EMSG_NO_DATA "\"%s\" DNS TXT record not found: "\ 79 "Defaulting to \"%s\"" 80 81 #define EMSG_DNS_THREAD_ERROR "Unable to create DNS query thread" 82 83 #define EMSG_DNS_DISABLE "%s: Further DNS queries disabled !" 84 85 #define EMSG_DNS_RR_INVAL "\"%s\" Invalid DNS TXT record: "\ 86 "Defaulting to \"%s\"" 87 88 /* 89 * DNS related info 90 */ 91 #define NFSMAPID_DNS_RR "_nfsv4idmapdomain" 92 #define NFSMAPID_DNS_TOUT_SECS (30LL) 93 #define NFSMAPID_SLOG_RATE 20 /* ~10 mins */ 94 95 #define NS_ERRS 6 /* netdb.h */ 96 97 typedef union { 98 HEADER hdr; 99 uchar_t buf[PACKETSZ]; 100 } ans_t; 101 102 /* 103 * NOTE: All s_ prefixed variables are only to be used by the DNS 104 * feature implementation (mapid.c). The exported globals 105 * (ie. seen by nfsmapid.c/nfsmapid_server.c) are the 106 * dns_ prefixed variables along with sysdns_domain. 107 */ 108 static ans_t s_ans; 109 static int s_anslen; 110 static char s_dname[DNAMEMAX] = {0}; 111 static char s_txt_rr[DNAMEMAX] = {0}; 112 113 static rwlock_t s_dns_data_lock = DEFAULTRWLOCK; 114 static rwlock_t s_dns_impl_lock = DEFAULTRWLOCK; 115 static mutex_t s_res_lock = ERRORCHECKMUTEX; 116 static uint32_t s_dns_tout = 0; 117 static thread_t s_dns_qthread; 118 static bool_t s_dns_qthr_created = FALSE; 119 static bool_t s_dns_disabled = FALSE; 120 static struct __res_state s_res = {0}; 121 static thread_key_t s_thr_key; 122 int lib_init_done = 0; 123 124 static int resolv_init(void); 125 static void resolv_decode(void); 126 static int resolv_error(void); 127 static void resolv_get_txt_data(void); 128 static void resolv_txt_reset(void); 129 static void resolve_process_txt(uchar_t *, int); 130 static int resolv_search(void); 131 static void resolv_destroy(void); 132 static uchar_t *resolv_skip_rr(uchar_t *, uchar_t *); 133 static void domain_sync(cb_t *, char *); 134 static int get_mtime(const char *, timestruc_t *); 135 static void get_nfs_domain(void); 136 static void get_dns_domain(void); 137 static void get_dns_txt_domain(cb_t *); 138 void _lib_init(void); 139 140 #ifdef DEBUG 141 bool_t nfsmapid_debug = FALSE; 142 #endif /* DEBUG */ 143 144 /* 145 * mapid_domain_lock: rwlock used to serialize access/changes 146 * to the library's mapid_domain global var. 147 * 148 * mapid_domain: Library variable used to store the current 149 * domain configured for use in decoding/encoding 150 * outbound and inbound attr strings, accordingly. 151 * 152 * nfs_domain: If nfsmapid_domain var in SMF 153 * has been set, nfs_domain will hold this 154 * value for the duration of the instance; 155 * If the value ever changes, the change is 156 * detected via the use of nfs_mtime and 157 * nfs_domain is updated accordingly. 158 * 159 * dns_domain: If the system's resolver (/etc/resolv.conf) 160 * has been configured, dns_domain will hold 161 * the configured DNS domain as reported by the 162 * res_ninit() resolver interface. If the system's 163 * /etc/resolv.conf file is updated, the change 164 * is detected via the use of dns_mtime and 165 * dns_domain is updated accordingly. 166 */ 167 rwlock_t mapid_domain_lock = DEFAULTRWLOCK; 168 uint32_t mapid_domain_len = 0; 169 char mapid_domain[DNAMEMAX] = {0}; 170 171 timestruc_t nfs_mtime = {0}; 172 uint32_t nfs_domain_len = 0; 173 char nfs_domain[DNAMEMAX] = {0}; 174 175 timestruc_t dns_mtime = {0}; 176 uint32_t dns_domain_len = 0; 177 char dns_domain[DNAMEMAX] = {0}; 178 179 int dns_txt_cached = 0; 180 uint32_t dns_txt_domain_len = 0; 181 char dns_txt_domain[DNAMEMAX] = {0}; 182 char sysdns_domain[DNAMEMAX] = {0}; 183 184 timestruc_t zapped_mtime = {0}; 185 186 #define ZAP_DOMAIN(which) \ 187 { \ 188 bzero(which##_domain, DNAMEMAX);\ 189 which##_domain_len = 0; \ 190 which##_mtime = zapped_mtime; \ 191 } 192 193 #define TIMESTRUC_EQ(a, b) \ 194 (((a).tv_sec == (b).tv_sec) && \ 195 ((a).tv_nsec == (b).tv_nsec)) 196 197 198 199 #endif /* __LIBMAPID_IMPL */ 200 201 /* 202 * PSARC 2005/487 Consolidation Private Interfaces 203 * mapid_reeval_domain(), mapid_get_domain() 204 * Changes must be reviewed by Solaris File Sharing 205 */ 206 extern void mapid_reeval_domain(cb_t *); 207 extern char *mapid_get_domain(void); 208 209 /* 210 * PSARC 2005/487 Contracted Sun Private Interface 211 * mapid_derive_domain(), mapid_stdchk_domain() 212 * Changes must be reviewed by Solaris File Sharing 213 * Changes must be communicated to contract-2005-487-01@sun.com 214 */ 215 extern int mapid_stdchk_domain(const char *); 216 extern char *mapid_derive_domain(void); 217 218 #ifdef __cplusplus 219 } 220 #endif 221 222 #endif /* _MAPID_H */ 223