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 2008 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 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <string.h> 37 #include <strings.h> 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <rpc/types.h> 41 #include <netinet/in.h> 42 #include <arpa/nameser.h> 43 #include <resolv.h> 44 #include <netdb.h> 45 #include <errno.h> 46 #include <ctype.h> 47 #include <sys/socket.h> 48 #include <arpa/inet.h> 49 #include <assert.h> 50 #include <synch.h> 51 #include <syslog.h> 52 #include <locale.h> 53 #include <thread.h> 54 #include <deflt.h> 55 #include <nfs/nfs4.h> 56 57 #define DNAMEMAX (NS_MAXCDNAME + 1) 58 59 typedef struct { 60 void *(*fcn)(void *); 61 int signal; 62 } cb_t; 63 64 #ifdef __LIBMAPID_IMPL 65 66 /* 67 * Error Messages 68 */ 69 #define EMSG_NETDB_INTERNAL "Internal Resolver Error: %s" 70 71 #define EMSG_TRY_AGAIN "\"%s\" DNS nameserver(s) not responding" \ 72 "...\tRetrying" 73 74 #define EMSG_NO_RECOVERY "Unrecoverable Resolver Error: %s" 75 76 #define EMSG_HOST_NOT_FOUND "Authoritative nameserver unresponsive " \ 77 "to queries for domain \"%s\"" 78 79 #define EMSG_NO_DATA "\"%s\" DNS TXT record not found: "\ 80 "Defaulting to \"%s\"" 81 82 #define EMSG_DNS_THREAD_ERROR "Unable to create DNS query thread" 83 84 #define EMSG_DNS_DISABLE "%s: Further DNS queries disabled !" 85 86 #define EMSG_DNS_RR_INVAL "\"%s\" Invalid DNS TXT record: "\ 87 "Defaulting to \"%s\"" 88 89 /* 90 * DNS related info 91 */ 92 #define NFSMAPID_DNS_RR "_nfsv4idmapdomain" 93 #define NFSMAPID_DNS_TOUT_SECS (30LL) 94 #define NFSMAPID_SLOG_RATE 20 /* ~10 mins */ 95 96 #define NS_ERRS 6 /* netdb.h */ 97 98 typedef union { 99 HEADER hdr; 100 uchar_t buf[PACKETSZ]; 101 } ans_t; 102 103 /* 104 * NOTE: All s_ prefixed variables are only to be used by the DNS 105 * feature implementation (mapid.c). The exported globals 106 * (ie. seen by nfsmapid.c/nfsmapid_server.c) are the 107 * dns_ prefixed variables along with sysdns_domain. 108 */ 109 static ans_t s_ans; 110 static int s_anslen; 111 static char s_dname[DNAMEMAX] = {0}; 112 static char s_txt_rr[DNAMEMAX] = {0}; 113 114 static rwlock_t s_dns_data_lock = DEFAULTRWLOCK; 115 static rwlock_t s_dns_impl_lock = DEFAULTRWLOCK; 116 static mutex_t s_res_lock = ERRORCHECKMUTEX; 117 static uint32_t s_dns_tout = 0; 118 static thread_t s_dns_qthread; 119 static bool_t s_dns_qthr_created = FALSE; 120 static bool_t s_dns_disabled = FALSE; 121 static struct __res_state s_res = {0}; 122 static thread_key_t s_thr_key; 123 int lib_init_done = 0; 124 125 static int resolv_init(void); 126 static void resolv_decode(void); 127 static int resolv_error(void); 128 static void resolv_get_txt_data(void); 129 static void resolv_txt_reset(void); 130 static void resolve_process_txt(uchar_t *, int); 131 static int resolv_search(void); 132 static void resolv_destroy(void); 133 static uchar_t *resolv_skip_rr(uchar_t *, uchar_t *); 134 static void domain_sync(cb_t *, char *); 135 static int get_mtime(const char *, timestruc_t *); 136 static void get_nfs_domain(void); 137 static void get_dns_domain(void); 138 static void get_dns_txt_domain(cb_t *); 139 void _lib_init(void); 140 141 #ifdef DEBUG 142 bool_t nfsmapid_debug = FALSE; 143 #endif /* DEBUG */ 144 145 /* 146 * mapid_domain_lock: rwlock used to serialize access/changes 147 * to the library's mapid_domain global var. 148 * 149 * mapid_domain: Library variable used to store the current 150 * domain configured for use in decoding/encoding 151 * outbound and inbound attr strings, accordingly. 152 * 153 * nfs_domain: If /etc/default/nfs NFSMAPID_DOMAIN var 154 * has been set, nfs_domain will hold this 155 * value for the duration of the instance; 156 * If the value ever changes, the change is 157 * detected via the use of nfs_mtime and 158 * nfs_domain is updated accordingly. 159 * 160 * dns_domain: If the system's resolver (/etc/resolv.conf) 161 * has been configured, dns_domain will hold 162 * the configured DNS domain as reported by the 163 * res_ninit() resolver interface. If the system's 164 * /etc/resolv.conf file is updated, the change 165 * is detected via the use of dns_mtime and 166 * dns_domain is updated accordingly. 167 */ 168 rwlock_t mapid_domain_lock = DEFAULTRWLOCK; 169 uint32_t mapid_domain_len = 0; 170 char mapid_domain[DNAMEMAX] = {0}; 171 172 timestruc_t nfs_mtime = {0}; 173 uint32_t nfs_domain_len = 0; 174 char nfs_domain[DNAMEMAX] = {0}; 175 176 timestruc_t dns_mtime = {0}; 177 uint32_t dns_domain_len = 0; 178 char dns_domain[DNAMEMAX] = {0}; 179 180 int dns_txt_cached = 0; 181 uint32_t dns_txt_domain_len = 0; 182 char dns_txt_domain[DNAMEMAX] = {0}; 183 char sysdns_domain[DNAMEMAX] = {0}; 184 185 timestruc_t zapped_mtime = {0}; 186 187 #define ZAP_DOMAIN(which) \ 188 { \ 189 bzero(which##_domain, DNAMEMAX);\ 190 which##_domain_len = 0; \ 191 which##_mtime = zapped_mtime; \ 192 } 193 194 #define TIMESTRUC_EQ(a, b) \ 195 (((a).tv_sec == (b).tv_sec) && \ 196 ((a).tv_nsec == (b).tv_nsec)) 197 198 199 200 #endif /* __LIBMAPID_IMPL */ 201 202 /* 203 * PSARC 2005/487 Consolidation Private Interfaces 204 * mapid_reeval_domain(), mapid_get_domain() 205 * Changes must be reviewed by Solaris File Sharing 206 */ 207 extern void mapid_reeval_domain(cb_t *); 208 extern char *mapid_get_domain(void); 209 210 /* 211 * PSARC 2005/487 Contracted Sun Private Interface 212 * mapid_derive_domain(), mapid_stdchk_domain() 213 * Changes must be reviewed by Solaris File Sharing 214 * Changes must be communicated to contract-2005-487-01@sun.com 215 */ 216 extern int mapid_stdchk_domain(const char *); 217 extern char *mapid_derive_domain(void); 218 219 #ifdef __cplusplus 220 } 221 #endif 222 223 #endif /* _MAPID_H */ 224