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54abd2aa66
samba-mirror/source3/libsmb/smb_share_modes.c
Gerald Carter 54abd2aa66 r10656: BIG merge from trunk. Features not copied over 
* \PIPE\unixinfo
* winbindd's {group,alias}membership new functions
* winbindd's lookupsids() functionality
* swat (trunk changes to be reverted as per discussion with Deryck)
(This used to be commit 939c3cb5d7)
2007-10-10 11:04:48 -05:00

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/*
Samba share mode database library external interface library.
Used by non-Samba products needing access to the Samba share mode db.
Copyright (C) Jeremy Allison 2005.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "includes.h"
#include "smb_share_modes.h"
/* Remove the paranoid malloc checker. */
#ifdef malloc
#undef malloc
#endif
/*
* open/close sharemode database.
*/
struct smbdb_ctx *smb_share_mode_db_open(const char *db_path)
{
struct smbdb_ctx *smb_db = (struct smbdb_ctx *)malloc(sizeof(struct smbdb_ctx));
if (!smb_db) {
return NULL;
}
memset(smb_db, '\0', sizeof(struct smbdb_ctx));
smb_db->smb_tdb = tdb_open(db_path,
0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST,
O_RDWR|O_CREAT,
0644);
if (!smb_db->smb_tdb) {
free(smb_db);
return NULL;
}
/* Should check that this is the correct version.... */
return smb_db;
}
/* key and data records in the tdb locking database */
struct locking_key {
SMB_DEV_T dev;
SMB_INO_T inode;
};
int smb_share_mode_db_close(struct smbdb_ctx *db_ctx)
{
int ret = tdb_close(db_ctx->smb_tdb);
free(db_ctx);
return ret;
}
static TDB_DATA get_locking_key(uint64_t dev, uint64_t ino)
{
static struct locking_key lk;
TDB_DATA ld;
memset(&lk, '\0', sizeof(struct locking_key));
lk.dev = (SMB_DEV_T)dev;
lk.inode = (SMB_INO_T)ino;
ld.dptr = (char *)&lk;
ld.dsize = sizeof(lk);
return ld;
}
/*
* lock/unlock entry in sharemode database.
*/
int smb_lock_share_mode_entry(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino)
{
return tdb_chainlock(db_ctx->smb_tdb, get_locking_key(dev, ino));
}
int smb_unlock_share_mode_entry(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino)
{
return tdb_chainunlock(db_ctx->smb_tdb, get_locking_key(dev, ino));
}
/* Internal structure of Samba share mode db. */
/* FIXME ! This should be moved into a Samba include file. */
struct locking_data {
union {
struct {
int num_share_mode_entries;
BOOL delete_on_close;
} s;
struct share_mode_entry dummy; /* Needed for alignment. */
} u;
/* the following two entries are implicit
struct share_mode_entry modes[num_share_mode_entries];
char file_name[];
*/
};
/*
* Check if an external smb_share_mode_entry and an internal share_mode entry match.
*/
static int share_mode_entry_equal(const struct smb_share_mode_entry *e_entry, const struct share_mode_entry *entry)
{
return (procid_equal(&e_entry->pid, &entry->pid) &&
e_entry->file_id == (uint32_t)entry->share_file_id &&
e_entry->open_time.tv_sec == entry->time.tv_sec &&
e_entry->open_time.tv_usec == entry->time.tv_usec &&
e_entry->share_access == (uint32_t)entry->share_access &&
e_entry->access_mask == (uint32_t)entry->access_mask &&
e_entry->dev == (uint64_t)entry->dev &&
e_entry->ino == (uint64_t)entry->inode);
}
/*
* Create an internal Samba share_mode entry from an external smb_share_mode_entry.
*/
static void create_share_mode_entry(struct share_mode_entry *out, const struct smb_share_mode_entry *in)
{
memset(out, '\0', sizeof(struct share_mode_entry));
out->pid = in->pid;
out->share_file_id = (unsigned long)in->file_id;
out->time.tv_sec = in->open_time.tv_sec;
out->time.tv_usec = in->open_time.tv_usec;
out->share_access = in->share_access;
out->access_mask = in->access_mask;
out->dev = (SMB_DEV_T)in->dev;
out->inode = (SMB_INO_T)in->ino;
}
/*
* Return the current share mode list for an open file.
* This uses similar (but simplified) logic to locking/locking.c
*/
int smb_get_share_mode_entries(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino,
struct smb_share_mode_entry **pp_list,
unsigned char *p_delete_on_close)
{
TDB_DATA db_data;
struct smb_share_mode_entry *list = NULL;
int num_share_modes = 0;
struct locking_data *ld = NULL; /* internal samba db state. */
struct share_mode_entry *shares = NULL;
size_t i;
int list_num;
*pp_list = NULL;
*p_delete_on_close = 0;
db_data = tdb_fetch(db_ctx->smb_tdb, get_locking_key(dev, ino));
if (!db_data.dptr) {
return 0;
}
ld = (struct locking_data *)db_data.dptr;
num_share_modes = ld->u.s.num_share_mode_entries;
if (!num_share_modes) {
free(db_data.dptr);
return 0;
}
list = (struct smb_share_mode_entry *)malloc(sizeof(struct smb_share_mode_entry)*num_share_modes);
if (!list) {
free(db_data.dptr);
return -1;
}
memset(list, '\0', num_share_modes * sizeof(struct smb_share_mode_entry));
shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
list_num = 0;
for (i = 0; i < num_share_modes; i++) {
struct share_mode_entry *share = &shares[i];
struct smb_share_mode_entry *sme = &list[list_num];
struct process_id pid = share->pid;
/* Check this process really exists. */
if (kill(procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
continue; /* No longer exists. */
}
/* Ignore deferred open entries. */
if (share->op_type == DEFERRED_OPEN_ENTRY) {
continue;
}
/* Copy into the external list. */
sme->dev = (uint64_t)share->dev;
sme->ino = (uint64_t)share->inode;
sme->share_access = (uint32_t)share->share_access;
sme->access_mask = (uint32_t)share->access_mask;
sme->open_time.tv_sec = share->time.tv_sec;
sme->open_time.tv_usec = share->time.tv_usec;
sme->file_id = (uint32_t)share->share_file_id;
sme->pid = share->pid;
list_num++;
}
if (list_num == 0) {
free(db_data.dptr);
free(list);
return 0;
}
*p_delete_on_close = ld->u.s.delete_on_close;
*pp_list = list;
free(db_data.dptr);
return list_num;
}
/*
* Create an entry in the Samba share mode db.
*/
int smb_create_share_mode_entry(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino,
const struct smb_share_mode_entry *new_entry,
const char *filename) /* Must be abolute utf8 path. */
{
TDB_DATA db_data;
TDB_DATA locking_key = get_locking_key(dev, ino);
int orig_num_share_modes = 0;
struct locking_data *ld = NULL; /* internal samba db state. */
struct share_mode_entry *shares = NULL;
char *new_data_p = NULL;
size_t new_data_size = 0;
db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
if (!db_data.dptr) {
/* We must create the entry. */
db_data.dptr = malloc((2*sizeof(struct share_mode_entry)) + strlen(filename) + 1);
if (!db_data.dptr) {
return -1;
}
ld = (struct locking_data *)db_data.dptr;
ld->u.s.num_share_mode_entries = 1;
ld->u.s.delete_on_close = 0;
shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
create_share_mode_entry(shares, new_entry);
memcpy(db_data.dptr + 2*sizeof(struct share_mode_entry),
filename,
strlen(filename) + 1);
db_data.dsize = 2*sizeof(struct share_mode_entry) + strlen(filename) + 1;
if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_INSERT) == -1) {
free(db_data.dptr);
return -1;
}
free(db_data.dptr);
return 0;
}
/* Entry exists, we must add a new entry. */
new_data_p = malloc(db_data.dsize + sizeof(struct share_mode_entry));
if (!new_data_p) {
free(db_data.dptr);
return -1;
}
ld = (struct locking_data *)db_data.dptr;
orig_num_share_modes = ld->u.s.num_share_mode_entries;
/* Copy the original data. */
memcpy(new_data_p, db_data.dptr, (orig_num_share_modes+1)*sizeof(struct share_mode_entry));
/* Add in the new share mode */
shares = (struct share_mode_entry *)(new_data_p +
((orig_num_share_modes+1)*sizeof(struct share_mode_entry)));
create_share_mode_entry(shares, new_entry);
ld = (struct locking_data *)new_data_p;
ld->u.s.num_share_mode_entries++;
/* Append the original filename */
memcpy(new_data_p + ((ld->u.s.num_share_mode_entries+1)*sizeof(struct share_mode_entry)),
db_data.dptr + ((orig_num_share_modes+1)*sizeof(struct share_mode_entry)),
db_data.dsize - ((orig_num_share_modes+1) * sizeof(struct share_mode_entry)));
new_data_size = db_data.dsize + sizeof(struct share_mode_entry);
free(db_data.dptr);
db_data.dptr = new_data_p;
db_data.dsize = new_data_size;
if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
free(db_data.dptr);
return -1;
}
free(db_data.dptr);
return 0;
}
int smb_delete_share_mode_entry(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino,
const struct smb_share_mode_entry *del_entry)
{
TDB_DATA db_data;
TDB_DATA locking_key = get_locking_key(dev, ino);
int orig_num_share_modes = 0;
struct locking_data *ld = NULL; /* internal samba db state. */
struct share_mode_entry *shares = NULL;
char *new_data_p = NULL;
size_t filename_size = 0;
size_t i, num_share_modes;
const char *fname_ptr = NULL;
db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
if (!db_data.dptr) {
return -1; /* Error - missing entry ! */
}
ld = (struct locking_data *)db_data.dptr;
orig_num_share_modes = ld->u.s.num_share_mode_entries;
shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
if (orig_num_share_modes == 1) {
/* Only one entry - better be ours... */
if (!share_mode_entry_equal(del_entry, shares)) {
/* Error ! We can't delete someone else's entry ! */
free(db_data.dptr);
return -1;
}
/* It's ours - just remove the entire record. */
free(db_data.dptr);
return tdb_delete(db_ctx->smb_tdb, locking_key);
}
/* More than one - allocate a new record minus the one we'll delete. */
new_data_p = malloc(db_data.dsize - sizeof(struct share_mode_entry));
if (!new_data_p) {
free(db_data.dptr);
return -1;
}
/* Copy the header. */
memcpy(new_data_p, db_data.dptr, sizeof(struct share_mode_entry));
num_share_modes = 0;
for (i = 0; i < orig_num_share_modes; i++) {
struct share_mode_entry *share = &shares[i];
struct process_id pid = share->pid;
/* Check this process really exists. */
if (kill(procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
continue; /* No longer exists. */
}
if (share_mode_entry_equal(del_entry, share)) {
continue; /* This is our delete taget. */
}
memcpy(new_data_p + ((num_share_modes+1)*sizeof(struct share_mode_entry)),
share, sizeof(struct share_mode_entry) );
num_share_modes++;
}
if (num_share_modes == 0) {
/* None left after pruning. Delete record. */
free(db_data.dptr);
free(new_data_p);
return tdb_delete(db_ctx->smb_tdb, locking_key);
}
/* Copy the terminating filename. */
fname_ptr = db_data.dptr + ((orig_num_share_modes+1) * sizeof(struct share_mode_entry));
filename_size = db_data.dsize - (fname_ptr - db_data.dptr);
memcpy(new_data_p + ((num_share_modes+1)*sizeof(struct share_mode_entry)),
fname_ptr,
filename_size);
free(db_data.dptr);
db_data.dptr = new_data_p;
/* Re-save smaller record. */
ld = (struct locking_data *)db_data.dptr;
ld->u.s.num_share_mode_entries = num_share_modes;
db_data.dsize = ((num_share_modes+1)*sizeof(struct share_mode_entry)) + filename_size;
if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
free(db_data.dptr);
return -1;
}
free(db_data.dptr);
return 0;
}
int smb_change_share_mode_entry(struct smbdb_ctx *db_ctx,
uint64_t dev,
uint64_t ino,
const struct smb_share_mode_entry *set_entry,
const struct smb_share_mode_entry *new_entry)
{
TDB_DATA db_data;
TDB_DATA locking_key = get_locking_key(dev, ino);
int num_share_modes = 0;
struct locking_data *ld = NULL; /* internal samba db state. */
struct share_mode_entry *shares = NULL;
size_t i;
int found_entry = 0;
db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
if (!db_data.dptr) {
return -1; /* Error - missing entry ! */
}
ld = (struct locking_data *)db_data.dptr;
num_share_modes = ld->u.s.num_share_mode_entries;
shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
for (i = 0; i < num_share_modes; i++) {
struct share_mode_entry *share = &shares[i];
struct process_id pid = share->pid;
/* Check this process really exists. */
if (kill(procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
continue; /* No longer exists. */
}
if (share_mode_entry_equal(set_entry, share)) {
create_share_mode_entry(share, new_entry);
found_entry = 1;
break;
}
}
if (!found_entry) {
free(db_data.dptr);
return -1;
}
/* Save modified data. */
if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
free(db_data.dptr);
return -1;
}
free(db_data.dptr);
return 0;
}
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