ed56328b92
idmap_add failure case (found by Ted Unangst via Colin Percival) also convert idmap_hashf to return void, since it can't fail also change some panics to error returns
509 lines
12 KiB
C
509 lines
12 KiB
C
/* $FreeBSD$ */
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/* $Id: nfs4_idmap.c,v 1.4 2003/11/05 14:58:59 rees Exp $ */
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/*
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* copyright (c) 2003
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* the regents of the university of michigan
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* all rights reserved
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*
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* permission is granted to use, copy, create derivative works and redistribute
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* this software and such derivative works for any purpose, so long as the name
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* of the university of michigan is not used in any advertising or publicity
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* pertaining to the use or distribution of this software without specific,
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* written prior authorization. if the above copyright notice or any other
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* identification of the university of michigan is included in any copy of any
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* portion of this software, then the disclaimer below must also be included.
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*
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* this software is provided as is, without representation from the university
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* of michigan as to its fitness for any purpose, and without warranty by the
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* university of michigan of any kind, either express or implied, including
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* without limitation the implied warranties of merchantability and fitness for
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* a particular purpose. the regents of the university of michigan shall not be
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* liable for any damages, including special, indirect, incidental, or
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* consequential damages, with respect to any claim arising out of or in
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* connection with the use of the software, even if it has been or is hereafter
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* advised of the possibility of such damages.
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*/
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/* TODO:
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* o validate ascii
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* */
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/lockmgr.h>
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#include <sys/fnv_hash.h>
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#include <sys/proc.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <sys/libkern.h>
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#include <rpc/rpcclnt.h>
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#include <nfs4client/nfs4_dev.h>
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#include <nfs4client/nfs4_idmap.h>
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#ifdef IDMAPVERBOSE
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#define IDMAP_DEBUG(...) printf(__VA_ARGS__);
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#else
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#define IDMAP_DEBUG(...)
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#endif
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#define IDMAP_HASH_SIZE 37
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MALLOC_DEFINE(M_IDMAP, "idmap", "idmap");
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#define idmap_entry_get(ID) MALLOC((ID), struct idmap_entry, sizeof(struct idmap_entry), M_IDMAP, M_WAITOK | M_ZERO)
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#define idmap_entry_put(ID) FREE((ID), M_IDMAP)
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struct idmap_entry {
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struct idmap_msg id_info;
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TAILQ_ENTRY(idmap_entry) id_entry_id;
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TAILQ_ENTRY(idmap_entry) id_entry_name;
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};
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struct idmap_hash {
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TAILQ_HEAD(, idmap_entry) hash_name[IDMAP_HASH_SIZE];
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TAILQ_HEAD(, idmap_entry) hash_id[IDMAP_HASH_SIZE];
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struct lock hash_lock;
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};
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#define IDMAP_RLOCK(lock) lockmgr(lock, LK_SHARED, NULL, curthread)
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#define IDMAP_WLOCK(lock) lockmgr(lock, LK_EXCLUSIVE, NULL, curthread)
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#define IDMAP_UNLOCK(lock) lockmgr(lock, LK_RELEASE, NULL, curthread)
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static struct idmap_hash idmap_uid_hash;
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static struct idmap_hash idmap_gid_hash;
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static struct idmap_entry * idmap_name_lookup(uint32_t, char *);
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static struct idmap_entry * idmap_id_lookup(uint32_t, ident_t);
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static int idmap_upcall_name(uint32_t, char *, struct idmap_entry **);
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static int idmap_upcall_id(uint32_t , ident_t, struct idmap_entry ** );
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static int idmap_add(struct idmap_entry *);
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static int
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idmap_upcall_name(uint32_t type, char * name, struct idmap_entry ** found)
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{
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int error;
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struct idmap_entry * e;
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size_t len, siz;
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if (type > IDMAP_MAX_TYPE || type == 0) {
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IDMAP_DEBUG("bad type %d\n", type);
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return EINVAL; /* XXX */
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}
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if (name == NULL || (len = strlen(name)) == 0 || len > IDMAP_MAXNAMELEN) {
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IDMAP_DEBUG("idmap_upcall_name: bad name\n");
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return EFAULT; /* XXX */
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}
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MALLOC(e, struct idmap_entry *, sizeof(struct idmap_entry), M_IDMAP,
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M_WAITOK | M_ZERO);
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e->id_info.id_type = type;
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bcopy(name, e->id_info.id_name, len);
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e->id_info.id_namelen = len;
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siz = sizeof(struct idmap_msg);
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error = nfs4dev_call(NFS4DEV_TYPE_IDMAP, (caddr_t)&e->id_info, siz,
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(caddr_t)&e->id_info, &siz);
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if (error) {
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IDMAP_DEBUG("error %d in nfs4dev_upcall()\n", error);
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*found = NULL;
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return error;
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}
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if (siz != sizeof(struct idmap_msg)) {
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IDMAP_DEBUG("bad size of returned message\n");
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*found = NULL;
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return EFAULT;
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}
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*found = e;
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return 0;
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}
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static int
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idmap_upcall_id(uint32_t type, ident_t id, struct idmap_entry ** found)
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{
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int error;
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struct idmap_entry * e;
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size_t siz;
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if (type > IDMAP_MAX_TYPE)
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panic("bad type"); /* XXX */
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MALLOC(e, struct idmap_entry *, sizeof(struct idmap_entry), M_IDMAP,
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M_WAITOK | M_ZERO);
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e->id_info.id_type = type;
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e->id_info.id_namelen = 0; /* should already */
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e->id_info.id_id = id;
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siz = sizeof(struct idmap_msg);
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error = nfs4dev_call(NFS4DEV_TYPE_IDMAP, (caddr_t)&e->id_info, siz,
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(caddr_t)&e->id_info, &siz);
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if (error) {
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IDMAP_DEBUG("error %d in nfs4dev_upcall()\n", error);
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*found = NULL;
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return error;
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}
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if (siz != sizeof(struct idmap_msg)) {
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IDMAP_DEBUG("bad size of returned message\n");
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*found = NULL;
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return EFAULT;
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}
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*found = e;
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return 0;
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}
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static void
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idmap_hashf(struct idmap_entry *e, uint32_t * hval_id, uint32_t * hval_name)
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{
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switch (e->id_info.id_type) {
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case IDMAP_TYPE_UID:
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*hval_id = e->id_info.id_id.uid % IDMAP_HASH_SIZE;
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break;
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case IDMAP_TYPE_GID:
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*hval_id = e->id_info.id_id.gid % IDMAP_HASH_SIZE;
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break;
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default:
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/* XXX yikes! */
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panic("hashf: bad type!");
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break;
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}
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if (e->id_info.id_namelen == 0)
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/* XXX */ panic("hashf: bad name");
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*hval_name = fnv_32_str(e->id_info.id_name, FNV1_32_INIT) % IDMAP_HASH_SIZE;
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}
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static int
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idmap_add(struct idmap_entry * e)
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{
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struct idmap_hash * hash;
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uint32_t hval_id, hval_name;
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if (e->id_info.id_namelen == 0) {
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printf("idmap_add: name of len 0\n");
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return EINVAL;
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}
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switch (e->id_info.id_type) {
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case IDMAP_TYPE_UID:
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hash = &idmap_uid_hash;
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break;
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case IDMAP_TYPE_GID:
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hash = &idmap_gid_hash;
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break;
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default:
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/* XXX yikes */
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panic("idmap add: bad type!");
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break;
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}
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idmap_hashf(e, &hval_id, &hval_name);
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IDMAP_WLOCK(&hash->hash_lock);
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TAILQ_INSERT_TAIL(&hash->hash_id[hval_id], e, id_entry_id);
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TAILQ_INSERT_TAIL(&hash->hash_name[hval_name], e, id_entry_name);
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IDMAP_UNLOCK(&hash->hash_lock);
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return 0;
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}
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static struct idmap_entry *
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idmap_id_lookup(uint32_t type, ident_t id)
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{
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struct idmap_hash * hash;
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uint32_t hval;
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struct idmap_entry * e;
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switch (type) {
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case IDMAP_TYPE_UID:
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hash = &idmap_uid_hash;
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hval = id.uid % IDMAP_HASH_SIZE;
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break;
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case IDMAP_TYPE_GID:
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hash = &idmap_gid_hash;
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hval = id.gid % IDMAP_HASH_SIZE;
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break;
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default:
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/* XXX yikes */
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panic("lookup: bad type!");
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break;
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}
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IDMAP_RLOCK(&hash->hash_lock);
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TAILQ_FOREACH(e, &hash->hash_id[hval], id_entry_name) {
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if ((type == IDMAP_TYPE_UID && e->id_info.id_id.uid == id.uid)||
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(type == IDMAP_TYPE_GID && e->id_info.id_id.gid == id.gid)) {
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IDMAP_UNLOCK(&hash->hash_lock);
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return e;
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}
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}
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IDMAP_UNLOCK(&hash->hash_lock);
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return NULL;
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}
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static struct idmap_entry *
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idmap_name_lookup(uint32_t type, char * name)
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{
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struct idmap_hash * hash;
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uint32_t hval;
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struct idmap_entry * e;
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size_t len;
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switch (type) {
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case IDMAP_TYPE_UID:
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hash = &idmap_uid_hash;
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break;
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case IDMAP_TYPE_GID:
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hash = &idmap_gid_hash;
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break;
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default:
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/* XXX yikes */
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panic("lookup: bad type!");
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break;
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}
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len = strlen(name);
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if (len == 0 || len > IDMAP_MAXNAMELEN) {
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IDMAP_DEBUG("bad name length %d\n", len);
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return NULL;
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}
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hval = fnv_32_str(name, FNV1_32_INIT) % IDMAP_HASH_SIZE;
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IDMAP_RLOCK(&hash->hash_lock);
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TAILQ_FOREACH(e, &hash->hash_name[hval], id_entry_name) {
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if ((strlen(e->id_info.id_name) == strlen(name)) && strncmp(e->id_info.id_name, name, strlen(name)) == 0) {
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IDMAP_UNLOCK(&hash->hash_lock);
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return e;
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}
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}
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IDMAP_UNLOCK(&hash->hash_lock);
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return NULL;
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}
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void
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idmap_init(void)
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{
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unsigned int i;
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for (i=0; i<IDMAP_HASH_SIZE; i++) {
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TAILQ_INIT(&idmap_uid_hash.hash_name[i]);
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TAILQ_INIT(&idmap_uid_hash.hash_id[i]);
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TAILQ_INIT(&idmap_gid_hash.hash_name[i]);
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TAILQ_INIT(&idmap_gid_hash.hash_id[i]);
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}
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lockinit(&idmap_uid_hash.hash_lock, PLOCK, "idmap uid hash table", 0,0);
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lockinit(&idmap_gid_hash.hash_lock, PLOCK, "idmap gid hash table", 0,0);
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}
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void idmap_uninit(void)
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{
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struct idmap_entry * e;
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int i;
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lockdestroy(&idmap_uid_hash.hash_lock);
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lockdestroy(&idmap_gid_hash.hash_lock);
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for (i=0; i<IDMAP_HASH_SIZE; i++) {
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while(!TAILQ_EMPTY(&idmap_uid_hash.hash_name[i])) {
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e = TAILQ_FIRST(&idmap_uid_hash.hash_name[i]);
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TAILQ_REMOVE(&idmap_uid_hash.hash_name[i], e, id_entry_name);
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TAILQ_REMOVE(&idmap_uid_hash.hash_id[i], e, id_entry_id);
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FREE(e, M_IDMAP);
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}
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while(!TAILQ_EMPTY(&idmap_gid_hash.hash_name[i])) {
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e = TAILQ_FIRST(&idmap_gid_hash.hash_name[i]);
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TAILQ_REMOVE(&idmap_gid_hash.hash_name[i], e, id_entry_name);
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TAILQ_REMOVE(&idmap_gid_hash.hash_id[i], e, id_entry_id);
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FREE(e, M_IDMAP);
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}
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}
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}
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int
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idmap_uid_to_name(uid_t uid, char ** name, size_t * len)
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{
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struct idmap_entry * e;
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int error = 0;
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ident_t id;
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id.uid = uid;
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if ((e = idmap_id_lookup(IDMAP_TYPE_UID, id)) == NULL) {
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if ((error = idmap_upcall_id(IDMAP_TYPE_UID, id, &e)) != 0) {
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IDMAP_DEBUG("error in upcall\n");
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return error;
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}
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if (e == NULL) {
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IDMAP_DEBUG("no error from upcall, but no data returned\n");
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return EFAULT;
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}
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if (idmap_add(e) != 0) {
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IDMAP_DEBUG("idmap_add failed\n");
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FREE(e, M_IDMAP);
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return EFAULT;
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}
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}
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*name = e->id_info.id_name;
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*len = e->id_info.id_namelen;
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return 0;
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}
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int
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idmap_gid_to_name(gid_t gid, char ** name, size_t * len)
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{
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struct idmap_entry * e;
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int error = 0;
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ident_t id;
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id.gid = gid;
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if ((e = idmap_id_lookup(IDMAP_TYPE_GID, id)) == NULL) {
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if ((error = idmap_upcall_id(IDMAP_TYPE_GID, id, &e))) {
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IDMAP_DEBUG("error in upcall\n");
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return error;
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}
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if (e == NULL) {
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IDMAP_DEBUG("no error from upcall, but no data returned\n");
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return EFAULT;
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}
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if (idmap_add(e) != 0) {
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IDMAP_DEBUG("idmap_add failed\n");
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FREE(e, M_IDMAP);
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}
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}
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*name = e->id_info.id_name;
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*len = e->id_info.id_namelen;
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return 0;
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}
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int
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idmap_name_to_uid(char * name, size_t len, uid_t * id)
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{
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struct idmap_entry * e;
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int error = 0;
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char * namestr;
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if (name == NULL )
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return EFAULT;
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if (len == 0 || len > IDMAP_MAXNAMELEN) {
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IDMAP_DEBUG("idmap_name_to_uid: bad len\n");
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return EINVAL;
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}
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/* XXX hack */
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MALLOC(namestr, char *, len + 1, M_TEMP, M_WAITOK);
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bcopy(name, namestr, len);
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namestr[len] = '\0';
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if ((e = idmap_name_lookup(IDMAP_TYPE_UID, namestr)) == NULL) {
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if ((error = idmap_upcall_name(IDMAP_TYPE_UID, namestr, &e))) {
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FREE(namestr, M_TEMP);
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return error;
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}
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if (e == NULL) {
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IDMAP_DEBUG("no error from upcall, but no data returned\n");
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FREE(namestr, M_TEMP);
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return EFAULT;
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}
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if (idmap_add(e) != 0) {
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IDMAP_DEBUG("idmap_add failed\n");
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FREE(e, M_IDMAP);
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}
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}
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*id = e->id_info.id_id.uid;
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FREE(namestr, M_TEMP);
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return 0;
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}
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int
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idmap_name_to_gid(char * name, size_t len, gid_t * id)
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{
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struct idmap_entry * e;
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int error = 0;
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char * namestr;
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if (name == NULL )
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return EFAULT;
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if (len == 0 || len > IDMAP_MAXNAMELEN) {
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IDMAP_DEBUG("idmap_name_to_uid: bad len\n");
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return EINVAL;
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}
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/* XXX hack */
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MALLOC(namestr, char *, len + 1, M_TEMP, M_WAITOK);
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bcopy(name, namestr, len);
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namestr[len] = '\0';
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if ((e = idmap_name_lookup(IDMAP_TYPE_GID, namestr)) == NULL) {
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if ((error = idmap_upcall_name(IDMAP_TYPE_GID, namestr, &e)) != 0) {
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IDMAP_DEBUG("error in upcall\n");
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FREE(namestr, M_TEMP);
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return error;
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}
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if (e == NULL) {
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IDMAP_DEBUG("no error from upcall, but no data returned\n");
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FREE(namestr, M_TEMP);
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return EFAULT;
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}
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if (idmap_add(e) != 0) {
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IDMAP_DEBUG("idmap_add failed\n");
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FREE(e, M_IDMAP);
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}
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}
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*id = e->id_info.id_id.gid;
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FREE(namestr, M_TEMP);
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return 0;
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}
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