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/*
* This file is part of the Green End SFTP Server.
* Copyright (C) 2007, 2011 Richard Kettlewell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/** @file handle.c @brief File handle implementation */
#include "sftpserver.h"
#include "debug.h"
#include "utils.h"
#include "sftp.h"
#include "handle.h"
#include "thread.h"
#include "types.h"
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
/** @brief Handle data structure */
struct handle {
int type; /**< @brief @ref SSH_FXP_OPEN or @ref SSH_FXP_OPENDIR */
uint32_t tag; /**< @brief Unique tag or 0 for unused */
union {
int fd; /**< @brief File descriptor for a file */
DIR *dir; /**< @brief Directory stream */
} u;
char *path; /**< @brief Name of file or directory */
unsigned flags; /**< @brief Flags */
};
/** @brief Table of handles */
static struct handle *handles;
/** @brief Size of @p handles array */
static size_t nhandles;
/** @brief Next sequence number */
static uint32_t sequence;
#if NTHREADS > 1
/** @brief Lock protecting handles data structure */
static pthread_mutex_t sftp_handle_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
/** @brief Find a free slot in @ref handles
* @param id Where to store handle
* @param type @ref SSH_FXP_OPEN or @ref SSH_FXP_OPENDIR
*/
static void find_free_handle(struct handleid *id, int type) {
size_t n;
for(n = 0; n < nhandles && handles[n].tag; ++n)
;
if(n == nhandles && nhandles < MAXHANDLES) {
/* need more space */
nhandles = (nhandles ? 2 * nhandles : 16);
assert(nhandles != 0);
handles = xrecalloc(handles, nhandles, sizeof (*handles));
memset(handles + n, 0, (nhandles - n) * sizeof (*handles));
}
while(!sequence)
++sequence; /* never have a tag of 0 */
handles[n].tag = sequence++;
handles[n].type = type;
id->id = n;
id->tag = handles[n].tag;
}
void sftp_handle_new_file(struct handleid *id,
int fd, const char *path, unsigned flags) {
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
find_free_handle(id, SSH_FXP_OPEN);
handles[id->id].u.fd = fd;
handles[id->id].path = xstrdup(path);
handles[id->id].flags = flags;
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
}
void sftp_handle_new_dir(struct handleid *id, DIR *dp, const char *path) {
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
find_free_handle(id, SSH_FXP_OPENDIR);
handles[id->id].u.dir = dp;
handles[id->id].path = xstrdup(path);
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
}
uint32_t sftp_handle_get_fd(const struct handleid *id,
int *fd, unsigned *flagsp) {
uint32_t rc;
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
if(id->id < nhandles
&& id->tag == handles[id->id].tag
&& handles[id->id].type == SSH_FXP_OPEN) {
*fd = handles[id->id].u.fd;
if(flagsp)
*flagsp = handles[id->id].flags;
rc = 0;
} else
rc = SSH_FX_INVALID_HANDLE;
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
return rc;
}
uint32_t sftp_handle_get_dir(const struct handleid *id,
DIR **dp, const char **pathp) {
uint32_t rc;
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
if(id->id < nhandles
&& id->tag == handles[id->id].tag
&& handles[id->id].type == SSH_FXP_OPENDIR) {
*dp = handles[id->id].u.dir;
if(pathp)
*pathp = handles[id->id].path;
rc = 0;
} else
rc = SSH_FX_INVALID_HANDLE;
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
return rc;
}
uint32_t sftp_handle_close(const struct handleid *id) {
uint32_t rc;
if(!id->tag)
return SSH_FX_INVALID_HANDLE;
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
if(id->id < nhandles
&& id->tag == handles[id->id].tag) {
handles[id->id].tag = 0; /* free up */
switch(handles[id->id].type) {
case SSH_FXP_OPEN:
if(close(handles[id->id].u.fd) < 0)
rc = HANDLER_ERRNO;
else
rc = 0;
break;
case SSH_FXP_OPENDIR:
if(closedir(handles[id->id].u.dir) < 0)
rc = HANDLER_ERRNO;
else
rc = 0;
break;
default:
rc = SSH_FX_INVALID_HANDLE;
}
free(handles[id->id].path);
handles[id->id].path = NULL;
}
else
rc = SSH_FX_INVALID_HANDLE;
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
return rc;
}
unsigned sftp_handle_flags(const struct handleid *id) {
unsigned rc;
ferrcheck(pthread_mutex_lock(&sftp_handle_lock));
if(id->id < nhandles
&& id->tag == handles[id->id].tag)
rc = handles[id->id].flags;
else
rc = 0;
ferrcheck(pthread_mutex_unlock(&sftp_handle_lock));
return rc;
}
/*
Local Variables:
c-basic-offset:2
comment-column:40
fill-column:79
indent-tabs-mode:nil
End:
*/
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