freebsd-dev/sys/nfs4client/nfs4_idmap.c

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/* $FreeBSD$ */
/* $Id: nfs4_idmap.c,v 1.4 2003/11/05 14:58:59 rees Exp $ */
/*-
* copyright (c) 2003
* the regents of the university of michigan
* all rights reserved
*
* permission is granted to use, copy, create derivative works and redistribute
* this software and such derivative works for any purpose, so long as the name
* of the university of michigan is not used in any advertising or publicity
* pertaining to the use or distribution of this software without specific,
* written prior authorization. if the above copyright notice or any other
* identification of the university of michigan is included in any copy of any
* portion of this software, then the disclaimer below must also be included.
*
* this software is provided as is, without representation from the university
* of michigan as to its fitness for any purpose, and without warranty by the
* university of michigan of any kind, either express or implied, including
* without limitation the implied warranties of merchantability and fitness for
* a particular purpose. the regents of the university of michigan shall not be
* liable for any damages, including special, indirect, incidental, or
* consequential damages, with respect to any claim arising out of or in
* connection with the use of the software, even if it has been or is hereafter
* advised of the possibility of such damages.
*/
/* TODO:
* o validate ascii
* */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/lockmgr.h>
#include <sys/fnv_hash.h>
#include <sys/proc.h>
#include <sys/syscall.h>
#include <sys/sysent.h>
#include <sys/libkern.h>
#include <rpc/rpcclnt.h>
#include <nfs4client/nfs4_dev.h>
#include <nfs4client/nfs4_idmap.h>
#ifdef IDMAPVERBOSE
#define IDMAP_DEBUG(...) printf(__VA_ARGS__);
#else
#define IDMAP_DEBUG(...)
#endif
#define IDMAP_HASH_SIZE 37
MALLOC_DEFINE(M_IDMAP, "idmap", "idmap");
#define idmap_entry_get(ID) MALLOC((ID), struct idmap_entry, sizeof(struct idmap_entry), M_IDMAP, M_WAITOK | M_ZERO)
#define idmap_entry_put(ID) FREE((ID), M_IDMAP)
struct idmap_entry {
struct idmap_msg id_info;
TAILQ_ENTRY(idmap_entry) id_entry_id;
TAILQ_ENTRY(idmap_entry) id_entry_name;
};
struct idmap_hash {
TAILQ_HEAD(, idmap_entry) hash_name[IDMAP_HASH_SIZE];
TAILQ_HEAD(, idmap_entry) hash_id[IDMAP_HASH_SIZE];
struct lock hash_lock;
};
#define IDMAP_RLOCK(lock) lockmgr(lock, LK_SHARED, NULL)
#define IDMAP_WLOCK(lock) lockmgr(lock, LK_EXCLUSIVE, NULL)
#define IDMAP_UNLOCK(lock) lockmgr(lock, LK_RELEASE, NULL)
static struct idmap_hash idmap_uid_hash;
static struct idmap_hash idmap_gid_hash;
static struct idmap_entry * idmap_name_lookup(uint32_t, char *);
static struct idmap_entry * idmap_id_lookup(uint32_t, ident_t);
static int idmap_upcall_name(uint32_t, char *, struct idmap_entry **);
static int idmap_upcall_id(uint32_t , ident_t, struct idmap_entry ** );
static int idmap_add(struct idmap_entry *);
static int
idmap_upcall_name(uint32_t type, char * name, struct idmap_entry ** found)
{
int error;
struct idmap_entry * e;
size_t len, siz;
if (type > IDMAP_MAX_TYPE || type == 0) {
IDMAP_DEBUG("bad type %d\n", type);
return EINVAL; /* XXX */
}
if (name == NULL || (len = strlen(name)) == 0 || len > IDMAP_MAXNAMELEN) {
IDMAP_DEBUG("idmap_upcall_name: bad name\n");
return EFAULT; /* XXX */
}
MALLOC(e, struct idmap_entry *, sizeof(struct idmap_entry), M_IDMAP,
M_WAITOK | M_ZERO);
e->id_info.id_type = type;
bcopy(name, e->id_info.id_name, len);
e->id_info.id_namelen = len;
siz = sizeof(struct idmap_msg);
error = nfs4dev_call(NFS4DEV_TYPE_IDMAP, (caddr_t)&e->id_info, siz,
(caddr_t)&e->id_info, &siz);
if (error) {
IDMAP_DEBUG("error %d in nfs4dev_upcall()\n", error);
*found = NULL;
return error;
}
if (siz != sizeof(struct idmap_msg)) {
IDMAP_DEBUG("bad size of returned message\n");
*found = NULL;
return EFAULT;
}
*found = e;
return 0;
}
static int
idmap_upcall_id(uint32_t type, ident_t id, struct idmap_entry ** found)
{
int error;
struct idmap_entry * e;
size_t siz;
if (type > IDMAP_MAX_TYPE)
panic("bad type"); /* XXX */
MALLOC(e, struct idmap_entry *, sizeof(struct idmap_entry), M_IDMAP,
M_WAITOK | M_ZERO);
e->id_info.id_type = type;
e->id_info.id_namelen = 0; /* should already */
e->id_info.id_id = id;
siz = sizeof(struct idmap_msg);
error = nfs4dev_call(NFS4DEV_TYPE_IDMAP, (caddr_t)&e->id_info, siz,
(caddr_t)&e->id_info, &siz);
if (error) {
IDMAP_DEBUG("error %d in nfs4dev_upcall()\n", error);
*found = NULL;
return error;
}
if (siz != sizeof(struct idmap_msg)) {
IDMAP_DEBUG("bad size of returned message\n");
*found = NULL;
return EFAULT;
}
*found = e;
return 0;
}
static void
idmap_hashf(struct idmap_entry *e, uint32_t * hval_id, uint32_t * hval_name)
{
switch (e->id_info.id_type) {
case IDMAP_TYPE_UID:
*hval_id = e->id_info.id_id.uid % IDMAP_HASH_SIZE;
break;
case IDMAP_TYPE_GID:
*hval_id = e->id_info.id_id.gid % IDMAP_HASH_SIZE;
break;
default:
/* XXX yikes! */
panic("hashf: bad type!");
break;
}
if (e->id_info.id_namelen == 0)
/* XXX */ panic("hashf: bad name");
*hval_name = fnv_32_str(e->id_info.id_name, FNV1_32_INIT) % IDMAP_HASH_SIZE;
}
static int
idmap_add(struct idmap_entry * e)
{
struct idmap_hash * hash;
uint32_t hval_id, hval_name;
if (e->id_info.id_namelen == 0) {
printf("idmap_add: name of len 0\n");
return EINVAL;
}
switch (e->id_info.id_type) {
case IDMAP_TYPE_UID:
hash = &idmap_uid_hash;
break;
case IDMAP_TYPE_GID:
hash = &idmap_gid_hash;
break;
default:
/* XXX yikes */
panic("idmap add: bad type!");
break;
}
idmap_hashf(e, &hval_id, &hval_name);
IDMAP_WLOCK(&hash->hash_lock);
TAILQ_INSERT_TAIL(&hash->hash_id[hval_id], e, id_entry_id);
TAILQ_INSERT_TAIL(&hash->hash_name[hval_name], e, id_entry_name);
IDMAP_UNLOCK(&hash->hash_lock);
return 0;
}
static struct idmap_entry *
idmap_id_lookup(uint32_t type, ident_t id)
{
struct idmap_hash * hash;
uint32_t hval;
struct idmap_entry * e;
switch (type) {
case IDMAP_TYPE_UID:
hash = &idmap_uid_hash;
hval = id.uid % IDMAP_HASH_SIZE;
break;
case IDMAP_TYPE_GID:
hash = &idmap_gid_hash;
hval = id.gid % IDMAP_HASH_SIZE;
break;
default:
/* XXX yikes */
panic("lookup: bad type!");
break;
}
IDMAP_RLOCK(&hash->hash_lock);
TAILQ_FOREACH(e, &hash->hash_id[hval], id_entry_name) {
if ((type == IDMAP_TYPE_UID && e->id_info.id_id.uid == id.uid)||
(type == IDMAP_TYPE_GID && e->id_info.id_id.gid == id.gid)) {
IDMAP_UNLOCK(&hash->hash_lock);
return e;
}
}
IDMAP_UNLOCK(&hash->hash_lock);
return NULL;
}
static struct idmap_entry *
idmap_name_lookup(uint32_t type, char * name)
{
struct idmap_hash * hash;
uint32_t hval;
struct idmap_entry * e;
size_t len;
switch (type) {
case IDMAP_TYPE_UID:
hash = &idmap_uid_hash;
break;
case IDMAP_TYPE_GID:
hash = &idmap_gid_hash;
break;
default:
/* XXX yikes */
panic("lookup: bad type!");
break;
}
len = strlen(name);
if (len == 0 || len > IDMAP_MAXNAMELEN) {
IDMAP_DEBUG("bad name length %d\n", len);
return NULL;
}
hval = fnv_32_str(name, FNV1_32_INIT) % IDMAP_HASH_SIZE;
IDMAP_RLOCK(&hash->hash_lock);
TAILQ_FOREACH(e, &hash->hash_name[hval], id_entry_name) {
if ((strlen(e->id_info.id_name) == strlen(name)) && strncmp(e->id_info.id_name, name, strlen(name)) == 0) {
IDMAP_UNLOCK(&hash->hash_lock);
return e;
}
}
IDMAP_UNLOCK(&hash->hash_lock);
return NULL;
}
void
idmap_init(void)
{
unsigned int i;
for (i=0; i<IDMAP_HASH_SIZE; i++) {
TAILQ_INIT(&idmap_uid_hash.hash_name[i]);
TAILQ_INIT(&idmap_uid_hash.hash_id[i]);
TAILQ_INIT(&idmap_gid_hash.hash_name[i]);
TAILQ_INIT(&idmap_gid_hash.hash_id[i]);
}
lockinit(&idmap_uid_hash.hash_lock, PLOCK, "idmap uid hash table", 0,0);
lockinit(&idmap_gid_hash.hash_lock, PLOCK, "idmap gid hash table", 0,0);
}
void idmap_uninit(void)
{
struct idmap_entry * e;
int i;
lockdestroy(&idmap_uid_hash.hash_lock);
lockdestroy(&idmap_gid_hash.hash_lock);
for (i=0; i<IDMAP_HASH_SIZE; i++) {
while(!TAILQ_EMPTY(&idmap_uid_hash.hash_name[i])) {
e = TAILQ_FIRST(&idmap_uid_hash.hash_name[i]);
TAILQ_REMOVE(&idmap_uid_hash.hash_name[i], e, id_entry_name);
TAILQ_REMOVE(&idmap_uid_hash.hash_id[i], e, id_entry_id);
FREE(e, M_IDMAP);
}
while(!TAILQ_EMPTY(&idmap_gid_hash.hash_name[i])) {
e = TAILQ_FIRST(&idmap_gid_hash.hash_name[i]);
TAILQ_REMOVE(&idmap_gid_hash.hash_name[i], e, id_entry_name);
TAILQ_REMOVE(&idmap_gid_hash.hash_id[i], e, id_entry_id);
FREE(e, M_IDMAP);
}
}
}
int
idmap_uid_to_name(uid_t uid, char ** name, size_t * len)
{
struct idmap_entry * e;
int error = 0;
ident_t id;
id.uid = uid;
if ((e = idmap_id_lookup(IDMAP_TYPE_UID, id)) == NULL) {
if ((error = idmap_upcall_id(IDMAP_TYPE_UID, id, &e)) != 0) {
IDMAP_DEBUG("error in upcall\n");
return error;
}
if (e == NULL) {
IDMAP_DEBUG("no error from upcall, but no data returned\n");
return EFAULT;
}
if (idmap_add(e) != 0) {
IDMAP_DEBUG("idmap_add failed\n");
FREE(e, M_IDMAP);
return EFAULT;
}
}
*name = e->id_info.id_name;
*len = e->id_info.id_namelen;
return 0;
}
int
idmap_gid_to_name(gid_t gid, char ** name, size_t * len)
{
struct idmap_entry * e;
int error = 0;
ident_t id;
id.gid = gid;
if ((e = idmap_id_lookup(IDMAP_TYPE_GID, id)) == NULL) {
if ((error = idmap_upcall_id(IDMAP_TYPE_GID, id, &e))) {
IDMAP_DEBUG("error in upcall\n");
return error;
}
if (e == NULL) {
IDMAP_DEBUG("no error from upcall, but no data returned\n");
return EFAULT;
}
if (idmap_add(e) != 0) {
IDMAP_DEBUG("idmap_add failed\n");
FREE(e, M_IDMAP);
}
}
*name = e->id_info.id_name;
*len = e->id_info.id_namelen;
return 0;
}
int
idmap_name_to_uid(char * name, size_t len, uid_t * id)
{
struct idmap_entry * e;
int error = 0;
char * namestr;
if (name == NULL )
return EFAULT;
if (len == 0 || len > IDMAP_MAXNAMELEN) {
IDMAP_DEBUG("idmap_name_to_uid: bad len\n");
return EINVAL;
}
/* XXX hack */
MALLOC(namestr, char *, len + 1, M_TEMP, M_WAITOK);
bcopy(name, namestr, len);
namestr[len] = '\0';
if ((e = idmap_name_lookup(IDMAP_TYPE_UID, namestr)) == NULL) {
if ((error = idmap_upcall_name(IDMAP_TYPE_UID, namestr, &e))) {
FREE(namestr, M_TEMP);
return error;
}
if (e == NULL) {
IDMAP_DEBUG("no error from upcall, but no data returned\n");
FREE(namestr, M_TEMP);
return EFAULT;
}
if (idmap_add(e) != 0) {
IDMAP_DEBUG("idmap_add failed\n");
FREE(e, M_IDMAP);
}
}
*id = e->id_info.id_id.uid;
FREE(namestr, M_TEMP);
return 0;
}
int
idmap_name_to_gid(char * name, size_t len, gid_t * id)
{
struct idmap_entry * e;
int error = 0;
char * namestr;
if (name == NULL )
return EFAULT;
if (len == 0 || len > IDMAP_MAXNAMELEN) {
IDMAP_DEBUG("idmap_name_to_uid: bad len\n");
return EINVAL;
}
/* XXX hack */
MALLOC(namestr, char *, len + 1, M_TEMP, M_WAITOK);
bcopy(name, namestr, len);
namestr[len] = '\0';
if ((e = idmap_name_lookup(IDMAP_TYPE_GID, namestr)) == NULL) {
if ((error = idmap_upcall_name(IDMAP_TYPE_GID, namestr, &e)) != 0) {
IDMAP_DEBUG("error in upcall\n");
FREE(namestr, M_TEMP);
return error;
}
if (e == NULL) {
IDMAP_DEBUG("no error from upcall, but no data returned\n");
FREE(namestr, M_TEMP);
return EFAULT;
}
if (idmap_add(e) != 0) {
IDMAP_DEBUG("idmap_add failed\n");
FREE(e, M_IDMAP);
}
}
*id = e->id_info.id_id.gid;
FREE(namestr, M_TEMP);
return 0;
}