OpenSolaris_b135/lib/libmapid/common/mapid.h
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _MAPID_H
#define _MAPID_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <rpc/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <assert.h>
#include <synch.h>
#include <syslog.h>
#include <locale.h>
#include <thread.h>
#include <deflt.h>
#include <nfs/nfs4.h>
#define DNAMEMAX (NS_MAXCDNAME + 1)
typedef struct {
void *(*fcn)(void *);
int signal;
} cb_t;
#ifdef __LIBMAPID_IMPL
/*
* Error Messages
*/
#define EMSG_NETDB_INTERNAL "Internal Resolver Error: %s"
#define EMSG_TRY_AGAIN "\"%s\" DNS nameserver(s) not responding" \
"...\tRetrying"
#define EMSG_NO_RECOVERY "Unrecoverable Resolver Error: %s"
#define EMSG_HOST_NOT_FOUND "Authoritative nameserver unresponsive " \
"to queries for domain \"%s\""
#define EMSG_NO_DATA "\"%s\" DNS TXT record not found: "\
"Defaulting to \"%s\""
#define EMSG_DNS_THREAD_ERROR "Unable to create DNS query thread"
#define EMSG_DNS_DISABLE "%s: Further DNS queries disabled !"
#define EMSG_DNS_RR_INVAL "\"%s\" Invalid DNS TXT record: "\
"Defaulting to \"%s\""
/*
* DNS related info
*/
#define NFSMAPID_DNS_RR "_nfsv4idmapdomain"
#define NFSMAPID_DNS_TOUT_SECS (30LL)
#define NFSMAPID_SLOG_RATE 20 /* ~10 mins */
#define NS_ERRS 6 /* netdb.h */
typedef union {
HEADER hdr;
uchar_t buf[PACKETSZ];
} ans_t;
/*
* NOTE: All s_ prefixed variables are only to be used by the DNS
* feature implementation (mapid.c). The exported globals
* (ie. seen by nfsmapid.c/nfsmapid_server.c) are the
* dns_ prefixed variables along with sysdns_domain.
*/
static ans_t s_ans;
static int s_anslen;
static char s_dname[DNAMEMAX] = {0};
static char s_txt_rr[DNAMEMAX] = {0};
static rwlock_t s_dns_data_lock = DEFAULTRWLOCK;
static rwlock_t s_dns_impl_lock = DEFAULTRWLOCK;
static mutex_t s_res_lock = ERRORCHECKMUTEX;
static uint32_t s_dns_tout = 0;
static thread_t s_dns_qthread;
static bool_t s_dns_qthr_created = FALSE;
static bool_t s_dns_disabled = FALSE;
static struct __res_state s_res = {0};
static thread_key_t s_thr_key;
int lib_init_done = 0;
static int resolv_init(void);
static void resolv_decode(void);
static int resolv_error(void);
static void resolv_get_txt_data(void);
static void resolv_txt_reset(void);
static void resolve_process_txt(uchar_t *, int);
static int resolv_search(void);
static void resolv_destroy(void);
static uchar_t *resolv_skip_rr(uchar_t *, uchar_t *);
static void domain_sync(cb_t *, char *);
static int get_mtime(const char *, timestruc_t *);
static void get_nfs_domain(void);
static void get_dns_domain(void);
static void get_dns_txt_domain(cb_t *);
void _lib_init(void);
#ifdef DEBUG
bool_t nfsmapid_debug = FALSE;
#endif /* DEBUG */
/*
* mapid_domain_lock: rwlock used to serialize access/changes
* to the library's mapid_domain global var.
*
* mapid_domain: Library variable used to store the current
* domain configured for use in decoding/encoding
* outbound and inbound attr strings, accordingly.
*
* nfs_domain: If /etc/default/nfs NFSMAPID_DOMAIN var
* has been set, nfs_domain will hold this
* value for the duration of the instance;
* If the value ever changes, the change is
* detected via the use of nfs_mtime and
* nfs_domain is updated accordingly.
*
* dns_domain: If the system's resolver (/etc/resolv.conf)
* has been configured, dns_domain will hold
* the configured DNS domain as reported by the
* res_ninit() resolver interface. If the system's
* /etc/resolv.conf file is updated, the change
* is detected via the use of dns_mtime and
* dns_domain is updated accordingly.
*/
rwlock_t mapid_domain_lock = DEFAULTRWLOCK;
uint32_t mapid_domain_len = 0;
char mapid_domain[DNAMEMAX] = {0};
timestruc_t nfs_mtime = {0};
uint32_t nfs_domain_len = 0;
char nfs_domain[DNAMEMAX] = {0};
timestruc_t dns_mtime = {0};
uint32_t dns_domain_len = 0;
char dns_domain[DNAMEMAX] = {0};
int dns_txt_cached = 0;
uint32_t dns_txt_domain_len = 0;
char dns_txt_domain[DNAMEMAX] = {0};
char sysdns_domain[DNAMEMAX] = {0};
timestruc_t zapped_mtime = {0};
#define ZAP_DOMAIN(which) \
{ \
bzero(which##_domain, DNAMEMAX);\
which##_domain_len = 0; \
which##_mtime = zapped_mtime; \
}
#define TIMESTRUC_EQ(a, b) \
(((a).tv_sec == (b).tv_sec) && \
((a).tv_nsec == (b).tv_nsec))
#endif /* __LIBMAPID_IMPL */
/*
* PSARC 2005/487 Consolidation Private Interfaces
* mapid_reeval_domain(), mapid_get_domain()
* Changes must be reviewed by Solaris File Sharing
*/
extern void mapid_reeval_domain(cb_t *);
extern char *mapid_get_domain(void);
/*
* PSARC 2005/487 Contracted Sun Private Interface
* mapid_derive_domain(), mapid_stdchk_domain()
* Changes must be reviewed by Solaris File Sharing
* Changes must be communicated to contract-2005-487-01@sun.com
*/
extern int mapid_stdchk_domain(const char *);
extern char *mapid_derive_domain(void);
#ifdef __cplusplus
}
#endif
#endif /* _MAPID_H */