smbw_stat.c

来自「samba-3.0.22.tar.gz 编译smb服务器的源码」· C语言 代码 · 共 271 行

/* 
   Unix SMB/CIFS implementation.
   SMB wrapper stat functions
   Copyright (C) Andrew Tridgell 1998
   
   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int smbw_busy;

/***************************************************** 
setup basic info in a stat structure
*******************************************************/
void smbw_setup_stat(struct stat *st, char *fname, size_t size, int mode)
{
	st->st_mode = 0;

	if (IS_DOS_DIR(mode)) {
		st->st_mode = SMBW_DIR_MODE;
	} else {
		st->st_mode = SMBW_FILE_MODE;
	}

	if (IS_DOS_ARCHIVE(mode)) st->st_mode |= S_IXUSR;
	if (IS_DOS_SYSTEM(mode)) st->st_mode |= S_IXGRP;
	if (IS_DOS_HIDDEN(mode)) st->st_mode |= S_IXOTH;
	if (!IS_DOS_READONLY(mode)) st->st_mode |= S_IWUSR;

	st->st_size = size;
#ifdef HAVE_STAT_ST_BLKSIZE
	st->st_blksize = 512;
#endif
#ifdef HAVE_STAT_ST_BLOCKS
	st->st_blocks = (size+511)/512;
#endif
	st->st_uid = getuid();
	st->st_gid = getgid();
	if (IS_DOS_DIR(mode)) {
		st->st_nlink = 2;
	} else {
		st->st_nlink = 1;
	}
	if (st->st_ino == 0) {
		st->st_ino = smbw_inode(fname);
	}
}


/***************************************************** 
try to do a QPATHINFO and if that fails then do a getatr
this is needed because win95 sometimes refuses the qpathinfo
*******************************************************/
BOOL smbw_getatr(struct smbw_server *srv, char *path, 
		 uint16 *mode, size_t *size, 
		 time_t *c_time, time_t *a_time, time_t *m_time,
		 SMB_INO_T *ino)
{
        time_t c_a_m_time;
        /*
         * "size" (size_t) is only 32 bits.  Rather than change the interface
         * in this code as we change cli_qpathinfo2() and cli_getatr() to
         * support 64-bit file sizes, we'll use a temporary variable and
         * maintain the interface size_t.  At some point, someone may want to
         * change the interface as well.  djl
         */
        SMB_OFF_T fullsize;

	DEBUG(4,("sending qpathinfo\n"));

	if (!srv->no_pathinfo2 &&
	    cli_qpathinfo2(&srv->cli, path, c_time, a_time, m_time, NULL,
			   &fullsize, mode, ino)) {
                if (size != NULL) *size = (size_t) fullsize;
                return True;
        }

	/* if this is NT then don't bother with the getatr */
	if (srv->cli.capabilities & CAP_NT_SMBS) return False;

	if (cli_getatr(&srv->cli, path, mode, &fullsize, &c_a_m_time)) {
                if (a_time != NULL) *a_time = c_a_m_time;
                if (c_time != NULL) *a_time = c_a_m_time;
                if (m_time != NULL) *a_time = c_a_m_time;
                if (size != NULL) *size = (size_t) fullsize;
		srv->no_pathinfo2 = True;
		return True;
	}
	return False;
}


static struct print_job_info printjob;

/***************************************************** 
gather info from a printjob listing
*******************************************************/
static void smbw_printjob_stat(struct print_job_info *job)
{
	if (strcmp(job->name, printjob.name) == 0) {
		printjob = *job;
	}
}

/***************************************************** 
stat a printjob
*******************************************************/
int smbw_stat_printjob(struct smbw_server *srv,char *path,
		       size_t *size, time_t *m_time)
{
	if (path[0] == '\\') path++;

	ZERO_STRUCT(printjob);

	fstrcpy(printjob.name, path);
	cli_print_queue(&srv->cli, smbw_printjob_stat);

	if (size) {
		*size = printjob.size;
	}
	if (m_time) {
		*m_time = printjob.t;
	}
	return printjob.id;
}


/***************************************************** 
a wrapper for fstat()
*******************************************************/
int smbw_fstat(int fd, struct stat *st)
{
	struct smbw_file *file;
	time_t c_time, a_time, m_time;
	SMB_OFF_T size;
	uint16 mode;
	SMB_INO_T ino = 0;

	smbw_busy++;

	ZERO_STRUCTP(st);

	file = smbw_file(fd);
	if (!file) {
		int ret = smbw_dir_fstat(fd, st);
		smbw_busy--;
		return ret;
	}

	if (!cli_qfileinfo(&file->srv->cli, file->f->cli_fd, 
			   &mode, &size, &c_time, &a_time, &m_time, NULL,
			   &ino) &&
	    !cli_getattrE(&file->srv->cli, file->f->cli_fd, 
			  &mode, &size, &c_time, &a_time, &m_time)) {
		errno = EINVAL;
		smbw_busy--;
		return -1;
	}

	st->st_ino = ino;

	smbw_setup_stat(st, file->f->fname, size, mode);

	st->st_atime = a_time;
	st->st_ctime = c_time;
	st->st_mtime = m_time;
	st->st_dev = file->srv->dev;

	smbw_busy--;
	return 0;
}


/***************************************************** 
a wrapper for stat()
*******************************************************/
int smbw_stat(const char *fname, struct stat *st)
{
	struct smbw_server *srv;
	fstring server, share;
	pstring path;
	time_t m_time=0, a_time=0, c_time=0;
	size_t size=0;
	uint16 mode=0;
	SMB_INO_T ino = 0;
	int result = 0;

	ZERO_STRUCTP(st);

	if (!fname) {
		errno = EINVAL;
		return -1;
	}

	DEBUG(4,("stat(%s)\n", fname));

	smbw_init();

	smbw_busy++;

	/* work out what server they are after */
	smbw_parse_path(fname, server, share, path);

	/* get a connection to the server */
	srv = smbw_server(server, share);
	if (!srv) {

		/* For shares we aren't allowed to connect to, or no master
		   browser found, return an empty directory */

		if ((server[0] && share[0] && !path[0] && errno == EACCES) ||
		    (!path[0] && errno == ENOENT)) {
			mode = aDIR | aRONLY;
			smbw_setup_stat(st, path, size, mode);
			goto done;
		}

		/* smbw_server sets errno */
		result = -1;
		goto done;
	}

	DEBUG(4,("smbw_stat\n"));

	if (strncmp(srv->cli.dev,"IPC",3) == 0) {
		mode = aDIR | aRONLY;
	} else if (strncmp(srv->cli.dev,"LPT",3) == 0) {
		if (strcmp(path,"\\") == 0) {
			mode = aDIR | aRONLY;
		} else {
			mode = aRONLY;
			smbw_stat_printjob(srv, path, &size, &m_time);
			c_time = a_time = m_time;
		}
	} else {
		if (!smbw_getatr(srv, path, 
				 &mode, &size, &c_time, &a_time, &m_time,
				 &ino)) {
			errno = smbw_errno(&srv->cli);
			result = -1;
			goto done;
		}
	}

	st->st_ino = ino;

	smbw_setup_stat(st, path, size, mode);

	st->st_atime = a_time;
	st->st_ctime = c_time;
	st->st_mtime = m_time;
	st->st_dev = srv->dev;

 done:
	smbw_busy--;
	return result;
}