r6369: update release notes

[Samba.git] / source / include / libsmbclient.h

/*=====================================================================
  Unix SMB/Netbios implementation.
  SMB client library API definitions
  Copyright (C) Andrew Tridgell 1998
  Copyright (C) Richard Sharpe 2000
  Copyright (C) John Terpsra 2000
  Copyright (C) Tom Jansen (Ninja ISD) 2002 
  Copyright (C) Derrell Lipman 2003

   
  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.
  =====================================================================*/

#ifndef SMBCLIENT_H_INCLUDED
#define SMBCLIENT_H_INCLUDED

#ifdef __cplusplus
extern "C" {
#endif

/*-------------------------------------------------------------------*/
/* The following are special comments to instruct DOXYGEN (automated 
 * documentation tool:
*/
/** \defgroup libsmbclient
*/
/** \defgroup structure Data Structures Type and Constants
*   \ingroup libsmbclient
*   Data structures, types, and constants
*/
/** \defgroup callback Callback function types
*   \ingroup libsmbclient
*   Callback functions
*/
/** \defgroup file File Functions
*   \ingroup libsmbclient
*   Functions used to access individual file contents
*/
/** \defgroup directory Directory Functions
*   \ingroup libsmbclient
*   Functions used to access directory entries
*/
/** \defgroup attribute Attributes Functions
*   \ingroup libsmbclient
*   Functions used to view or change file and directory attributes
*/
/** \defgroup print Print Functions
*   \ingroup libsmbclient
*   Functions used to access printing functionality
*/
/** \defgroup misc Miscellaneous Functions
*   \ingroup libsmbclient
*   Functions that don't fit in to other categories
*/
/*-------------------------------------------------------------------*/   

/* Make sure we have the following includes for now ... */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <utime.h>

#define SMBC_BASE_FD        10000 /* smallest file descriptor returned */

#define SMBC_WORKGROUP      1
#define SMBC_SERVER         2
#define SMBC_FILE_SHARE     3
#define SMBC_PRINTER_SHARE  4
#define SMBC_COMMS_SHARE    5
#define SMBC_IPC_SHARE      6
#define SMBC_DIR            7
#define SMBC_FILE           8
#define SMBC_LINK           9

/**@ingroup structure
 * Structure that represents a directory entry.
 *
 */
struct smbc_dirent 
{
        /** Type of entity.
            SMBC_WORKGROUP=1,
            SMBC_SERVER=2, 
            SMBC_FILE_SHARE=3,
            SMBC_PRINTER_SHARE=4,
            SMBC_COMMS_SHARE=5,
            SMBC_IPC_SHARE=6,
            SMBC_DIR=7,
            SMBC_FILE=8,
            SMBC_LINK=9,*/ 
        unsigned int smbc_type; 

        /** Length of this smbc_dirent in bytes
         */
        unsigned int dirlen;
        /** The length of the comment string in bytes (includes null 
         *  terminator)
         */
        unsigned int commentlen;
        /** Points to the null terminated comment string 
         */
        char *comment;
        /** The length of the name string in bytes (includes null 
         *  terminator)
         */
        unsigned int namelen;
        /** Points to the null terminated name string 
         */
        char name[1];
};

/*
 * Flags for smbc_setxattr()
 *   Specify a bitwise OR of these, or 0 to add or replace as necessary
 */
#define SMBC_XATTR_FLAG_CREATE       0x1 /* fail if attr already exists */
#define SMBC_XATTR_FLAG_REPLACE      0x2 /* fail if attr does not exist */


/*
 * Mappings of the DOS mode bits, as returned by smbc_getxattr() when the
 * attribute name "system.dos_attr.mode" (or "system.dos_attr.*" or
 * "system.*") is specified.
 */
#define SMBC_DOS_MODE_READONLY       0x01
#define SMBC_DOS_MODE_HIDDEN         0x02
#define SMBC_DOS_MODE_SYSTEM         0x04
#define SMBC_DOS_MODE_VOLUME_ID      0x08
#define SMBC_DOS_MODE_DIRECTORY      0x10
#define SMBC_DOS_MODE_ARCHIVE        0x20


#ifndef ENOATTR
# define ENOATTR ENOENT        /* No such attribute */
#endif




/**@ingroup structure
 * Structure that represents a print job.
 *
 */
#ifndef _CLIENT_H
struct print_job_info 
{
        /** numeric ID of the print job
         */
        unsigned short id;
    
        /** represents print job priority (lower numbers mean higher priority)
         */
        unsigned short priority;
    
        /** Size of the print job
         */
        size_t size;
    
        /** Name of the user that owns the print job
         */
        char user[128];
  
        /** Name of the print job. This will have no name if an anonymous print
         *  file was opened. Ie smb://server/printer
         */
        char name[128];

        /** Time the print job was spooled
         */
        time_t t;
};
#endif /* _CLIENT_H */


/**@ingroup structure
 * Server handle 
 */
typedef struct _SMBCSRV  SMBCSRV;

/**@ingroup structure
 * File or directory handle 
 */
typedef struct _SMBCFILE SMBCFILE;

/**@ingroup structure
 * File or directory handle 
 */
typedef struct _SMBCCTX SMBCCTX;





/**@ingroup callback
 * Authentication callback function type.
 * 
 * Type for the the authentication function called by the library to
 * obtain authentication credentals
 *
 * @param srv       Server being authenticated to
 *
 * @param shr       Share being authenticated to
 *
 * @param wg        Pointer to buffer containing a "hint" for the
 *                  workgroup to be authenticated.  Should be filled in
 *                  with the correct workgroup if the hint is wrong.
 * 
 * @param wglen     The size of the workgroup buffer in bytes
 *
 * @param un        Pointer to buffer containing a "hint" for the
 *                  user name to be use for authentication. Should be
 *                  filled in with the correct workgroup if the hint is
 *                  wrong.
 * 
 * @param unlen     The size of the username buffer in bytes
 *
 * @param pw        Pointer to buffer containing to which password 
 *                  copied
 * 
 * @param pwlen     The size of the password buffer in bytes
 *           
 */
typedef void (*smbc_get_auth_data_fn)(const char *srv, 
                                      const char *shr,
                                      char *wg, int wglen, 
                                      char *un, int unlen,
                                      char *pw, int pwlen);


/**@ingroup callback
 * Print job info callback function type.
 *
 * @param i         pointer to print job information structure
 *
 */ 
typedef void (*smbc_list_print_job_fn)(struct print_job_info *i);
                

/**@ingroup callback
 * Check if a server is still good
 *
 * @param c         pointer to smb context
 *
 * @param srv       pointer to server to check
 *
 * @return          0 when connection is good. 1 on error.
 *
 */ 
typedef int (*smbc_check_server_fn)(SMBCCTX * c, SMBCSRV *srv);

/**@ingroup callback
 * Remove a server if unused
 *
 * @param c         pointer to smb context
 *
 * @param srv       pointer to server to remove
 *
 * @return          0 on success. 1 on failure.
 *
 */ 
typedef int (*smbc_remove_unused_server_fn)(SMBCCTX * c, SMBCSRV *srv);


/**@ingroup callback
 * Add a server to the cache system
 *
 * @param c         pointer to smb context
 *
 * @param srv       pointer to server to add
 *
 * @param server    server name 
 *
 * @param share     share name
 *
 * @param workgroup workgroup used to connect
 *
 * @param username  username used to connect
 *
 * @return          0 on success. 1 on failure.
 *
 */ 
typedef int (*smbc_add_cached_srv_fn)   (SMBCCTX * c, SMBCSRV *srv, 
                                    const char * server, const char * share,
                                    const char * workgroup, const char * username);

/**@ingroup callback
 * Look up a server in the cache system
 *
 * @param c         pointer to smb context
 *
 * @param server    server name to match
 *
 * @param share     share name to match
 *
 * @param workgroup workgroup to match
 *
 * @param username  username to match
 *
 * @return          pointer to SMBCSRV on success. NULL on failure.
 *
 */ 
typedef SMBCSRV * (*smbc_get_cached_srv_fn)   (SMBCCTX * c, const char * server,
                                               const char * share, const char * workgroup,
                                               const char * username);

/**@ingroup callback
 * Check if a server is still good
 *
 * @param c         pointer to smb context
 *
 * @param srv       pointer to server to remove
 *
 * @return          0 when found and removed. 1 on failure.
 *
 */ 
typedef int (*smbc_remove_cached_srv_fn)(SMBCCTX * c, SMBCSRV *srv);


/**@ingroup callback
 * Try to remove all servers from the cache system and disconnect
 *
 * @param c         pointer to smb context
 *
 * @return          0 when found and removed. 1 on failure.
 *
 */ 
typedef int (*smbc_purge_cached_fn)     (SMBCCTX * c);




/**@ingroup structure
 * Structure that contains a client context information 
 * This structure is know as SMBCCTX
 */
struct _SMBCCTX {
        /** debug level 
         */
        int     debug;
        
        /** netbios name used for making connections
         */
        char * netbios_name;

        /** workgroup name used for making connections 
         */
        char * workgroup;

        /** username used for making connections 
         */
        char * user;

        /** timeout used for waiting on connections / response data (in milliseconds)
         */
        int timeout;

        /** callable functions for files:
         * For usage and return values see the smbc_* functions
         */ 
        SMBCFILE * (*open)    (SMBCCTX *c, const char *fname, int flags, mode_t mode);
        SMBCFILE * (*creat)   (SMBCCTX *c, const char *path, mode_t mode);
        ssize_t    (*read)    (SMBCCTX *c, SMBCFILE *file, void *buf, size_t count);
        ssize_t    (*write)   (SMBCCTX *c, SMBCFILE *file, void *buf, size_t count);
        int        (*unlink)  (SMBCCTX *c, const char *fname);
        int        (*rename)  (SMBCCTX *ocontext, const char *oname, 
                               SMBCCTX *ncontext, const char *nname);
        off_t      (*lseek)   (SMBCCTX *c, SMBCFILE * file, off_t offset, int whence);
        int        (*stat)    (SMBCCTX *c, const char *fname, struct stat *st);
        int        (*fstat)   (SMBCCTX *c, SMBCFILE *file, struct stat *st);
        int        (*close)   (SMBCCTX *c, SMBCFILE *file);

        /** callable functions for dirs
         */ 
        SMBCFILE * (*opendir) (SMBCCTX *c, const char *fname);
        int        (*closedir)(SMBCCTX *c, SMBCFILE *dir);
        struct smbc_dirent * (*readdir)(SMBCCTX *c, SMBCFILE *dir);
        int        (*getdents)(SMBCCTX *c, SMBCFILE *dir, 
                               struct smbc_dirent *dirp, int count);
        int        (*mkdir)   (SMBCCTX *c, const char *fname, mode_t mode);
        int        (*rmdir)   (SMBCCTX *c, const char *fname);
        off_t      (*telldir) (SMBCCTX *c, SMBCFILE *dir);
        int        (*lseekdir)(SMBCCTX *c, SMBCFILE *dir, off_t offset);
        int        (*fstatdir)(SMBCCTX *c, SMBCFILE *dir, struct stat *st);
        int        (*chmod)(SMBCCTX *c, const char *fname, mode_t mode);
        int        (*utimes)(SMBCCTX *c,
                             const char *fname, struct timeval *tbuf);
        int        (*setxattr)(SMBCCTX *context,
                               const char *fname,
                               const char *name,
                               const void *value,
                               size_t size,
                               int flags);
        int        (*getxattr)(SMBCCTX *context,
                               const char *fname,
                               const char *name,
                               const void *value,
                               size_t size);
        int        (*removexattr)(SMBCCTX *context,
                                  const char *fname,
                                  const char *name);
        int        (*listxattr)(SMBCCTX *context,
                                const char *fname,
                                char *list,
                                size_t size);

        /** callable functions for printing
         */ 
        int        (*print_file)(SMBCCTX *c_file, const char *fname, 
                                 SMBCCTX *c_print, const char *printq);
        SMBCFILE * (*open_print_job)(SMBCCTX *c, const char *fname);
        int        (*list_print_jobs)(SMBCCTX *c, const char *fname, smbc_list_print_job_fn fn);
        int        (*unlink_print_job)(SMBCCTX *c, const char *fname, int id);


        /** Callbacks
         * These callbacks _always_ have to be initialized because they will not be checked
         * at dereference for increased speed.
         */
        struct _smbc_callbacks {
                /** authentication function callback: called upon auth requests
                 */
                smbc_get_auth_data_fn auth_fn;
                
                /** check if a server is still good
                 */
                smbc_check_server_fn check_server_fn;

                /** remove a server if unused
                 */
                smbc_remove_unused_server_fn remove_unused_server_fn;

                /** Cache subsystem
                 * For an example cache system see samba/source/libsmb/libsmb_cache.c
                 * Cache subsystem functions follow.
                 */

                /** server cache addition 
                 */
                smbc_add_cached_srv_fn add_cached_srv_fn;

                /** server cache lookup 
                 */
                smbc_get_cached_srv_fn get_cached_srv_fn;

                /** server cache removal
                 */
                smbc_remove_cached_srv_fn remove_cached_srv_fn;
                
                /** server cache purging, try to remove all cached servers (disconnect)
                 */
                smbc_purge_cached_fn purge_cached_fn;
        } callbacks;


        /** Space to store private data of the server cache.
         */
        struct smbc_server_cache * server_cache;

        int flags;
        
        /** user options selections that apply to this session
         */
        struct _smbc_options {

                /*
                 * From how many local master browsers should the list of
                 * workgroups be retrieved?  It can take up to 12 minutes or
                 * longer after a server becomes a local master browser, for
                 * it to have the entire browse list (the list of
                 * workgroups/domains) from an entire network.  Since a client
                 * never knows which local master browser will be found first,
                 * the one which is found first and used to retrieve a browse
                 * list may have an incomplete or empty browse list.  By
                 * requesting the browse list from multiple local master
                 * browsers, a more complete list can be generated.  For small
                 * networks (few workgroups), it is recommended that this
                 * value be set to 0, causing the browse lists from all found
                 * local master browsers to be retrieved and merged.  For
                 * networks with many workgroups, a suitable value for this
                 * variable is probably somewhere around 3. (Default: 3).
                 */
                int browse_max_lmb_count;

                /*
                 * There is a difference in the desired return strings from
                 * smbc_readdir() depending upon whether the filenames are to
                 * be displayed to the user, or whether they are to be
                 * appended to the path name passed to smbc_opendir() to call
                 * a further smbc_ function (e.g. open the file with
                 * smbc_open()).  In the former case, the filename should be
                 * in "human readable" form.  In the latter case, the smbc_
                 * functions expect a URL which must be url-encoded.  Those
                 * functions decode the URL.  If, for example, smbc_readdir()
                 * returned a file name of "abc%20def.txt", passing a path
                 * with this file name attached to smbc_open() would cause
                 * smbc_open to attempt to open the file "abc def.txt" since
                 * the %20 is decoded into a space.
                 *
                 * Set this option to True if the names returned by
                 * smbc_readdir() should be url-encoded such that they can be
                 * passed back to another smbc_ call.  Set it to False if the
                 * names returned by smbc_readdir() are to be presented to the
                 * user.
                 *
                 * For backwards compatibility, this option defaults to False.
                 */
                int urlencode_readdir_entries;

                /*
                 * Some Windows versions appear to have a limit to the number
                 * of concurrent SESSIONs and/or TREE CONNECTions.  In
                 * one-shot programs (i.e. the program runs and then quickly
                 * ends, thereby shutting down all connections), it is
                 * probably reasonable to establish a new connection for each
                 * share.  In long-running applications, the limitation can be
                 * avoided by using only a single connection to each server,
                 * and issuing a new TREE CONNECT when the share is accessed.
                 */
                int one_share_per_server;
        } options;
        
        /** INTERNAL DATA
         * do _NOT_ touch this from your program !
         */
        struct smbc_internal_data * internal;
};

/* Flags for SMBCCTX->flags */
#define SMB_CTX_FLAG_USE_KERBEROS (1 << 0)
#define SMB_CTX_FLAG_FALLBACK_AFTER_KERBEROS (1 << 1)
#define SMBCCTX_FLAG_NO_AUTO_ANONYMOUS_LOGON (1 << 2) /* don't try to do automatic anon login */

/**@ingroup misc
 * Create a new SBMCCTX (a context).
 *
 * Must be called before the context is passed to smbc_context_init()
 *
 * @return          The given SMBCCTX pointer on success, NULL on error with errno set:
 *                  - ENOMEM Out of memory
 *
 * @see             smbc_free_context(), smbc_init_context()
 *
 * @note            Do not forget to smbc_init_context() the returned SMBCCTX pointer !
 */
SMBCCTX * smbc_new_context(void);

/**@ingroup misc
 * Delete a SBMCCTX (a context) acquired from smbc_new_context().
 *
 * The context will be deleted if possible.
 *
 * @param context   A pointer to a SMBCCTX obtained from smbc_new_context()
 *
 * @param shutdown_ctx   If 1, all connections and files will be closed even if they are busy.
 *
 *
 * @return          Returns 0 on succes. Returns 1 on failure with errno set:
 *                  - EBUSY Server connections are still used, Files are open or cache 
 *                          could not be purged
 *                  - EBADF context == NULL
 *
 * @see             smbc_new_context()
 *
 * @note            It is advised to clean up all the contexts with shutdown_ctx set to 1
 *                  just before exit()'ing. When shutdown_ctx is 0, this function can be
 *                  use in periodical cleanup functions for example.
 */
int smbc_free_context(SMBCCTX * context, int shutdown_ctx);


/**@ingroup misc
 * Initialize a SBMCCTX (a context).
 *
 * Must be called before using any SMBCCTX API function
 *
 * @param context   A pointer to a SMBCCTX obtained from smbc_new_context()
 *
 * @return          A pointer to the given SMBCCTX on success, NULL on error with errno set:
 *                  - EBADF  NULL context given
 *                  - ENOMEM Out of memory
 *                  - ENOENT The smb.conf file would not load
 *
 * @see             smbc_new_context()
 *
 * @note            my_context = smbc_init_context(smbc_new_context()) is perfectly safe, 
 *                  but it might leak memory on smbc_context_init() failure. Avoid this.
 *                  You'll have to call smbc_free_context() yourself on failure.  
 */

SMBCCTX * smbc_init_context(SMBCCTX * context);

/**@ingroup misc
 * Initialize the samba client library.
 *
 * Must be called before using any of the smbclient API function
 *  
 * @param fn        The function that will be called to obtaion 
 *                  authentication credentials.
 *
 * @param debug     Allows caller to set the debug level. Can be
 *                  changed in smb.conf file. Allows caller to set
 *                  debugging if no smb.conf.
 *   
 * @return          0 on success, < 0 on error with errno set:
 *                  - ENOMEM Out of memory
 *                  - ENOENT The smb.conf file would not load
 *
 */

int smbc_init(smbc_get_auth_data_fn fn, int debug);

/**@ingroup misc
 * Set or retrieve the compatibility library's context pointer
 *
 * @param context   New context to use, or NULL.  If a new context is provided,
 *                  it must have allocated with smbc_new_context() and
 *                  initialized with smbc_init_context(), followed, optionally,
 *                  by some manual changes to some of the non-internal fields.
 *
 * @return          The old context.
 *
 * @see             smbc_new_context(), smbc_init_context(), smbc_init()
 *
 * @note            This function may be called prior to smbc_init() to force
 *                  use of the next context without any internal calls to
 *                  smbc_new_context() or smbc_init_context().  It may also
 *                  be called after smbc_init() has already called those two
 *                  functions, to replace the existing context with a new one.
 *                  Care should be taken, in this latter case, to ensure that
 *                  the server cache and any data allocated by the
 *                  authentication functions have been freed, if necessary.
 */

SMBCCTX * smbc_set_context(SMBCCTX * new_context);

/**@ingroup file
 * Open a file on an SMB server.
 *
 * @param furl      The smb url of the file to be opened. 
 *
 * @param flags     Is one of O_RDONLY, O_WRONLY or O_RDWR which 
 *                  request opening  the  file  read-only,write-only
 *                  or read/write. flags may also be bitwise-or'd with
 *                  one or  more of  the following: 
 *                  O_CREAT - If the file does not exist it will be 
 *                  created.
 *                  O_EXCL - When  used with O_CREAT, if the file 
 *                  already exists it is an error and the open will 
 *                  fail. 
 *                  O_TRUNC - If the file already exists it will be
 *                  truncated.
 *                  O_APPEND The  file  is  opened  in  append mode 
 *
 * @param mode      mode specifies the permissions to use if a new 
 *                  file is created.  It  is  modified  by  the 
 *                  process's umask in the usual way: the permissions
 *                  of the created file are (mode & ~umask) 
 *
 *                  Not currently use, but there for future use.
 *                  We will map this to SYSTEM, HIDDEN, etc bits
 *                  that reverses the mapping that smbc_fstat does.
 *
 * @return          Valid file handle, < 0 on error with errno set:
 *                  - ENOMEM  Out of memory
 *                  - EINVAL if an invalid parameter passed, like no 
 *                  file, or smbc_init not called.
 *                  - EEXIST  pathname already exists and O_CREAT and 
 *                  O_EXCL were used.
 *                  - EISDIR  pathname  refers  to  a  directory  and  
 *                  the access requested involved writing.
 *                  - EACCES  The requested access to the file is not 
 *                  allowed 
 *                  - ENODEV The requested share does not exist
 *                  - ENOTDIR A file on the path is not a directory
 *                  - ENOENT  A directory component in pathname does 
 *                  not exist.
 *
 * @see             smbc_creat()
 *
 * @note            This call uses an underlying routine that may create
 *                  a new connection to the server specified in the URL.
 *                  If the credentials supplied in the URL, or via the
 *                  auth_fn in the smbc_init call, fail, this call will
 *                  try again with an empty username and password. This 
 *                  often gets mapped to the guest account on some machines.
 */

int smbc_open(const char *furl, int flags, mode_t mode);

/**@ingroup file
 * Create a file on an SMB server.
 *
 * Same as calling smbc_open() with flags = O_CREAT|O_WRONLY|O_TRUNC 
 *   
 * @param furl      The smb url of the file to be created
 *  
 * @param mode      mode specifies the permissions to use if  a  new  
 *                  file is created.  It  is  modified  by  the 
 *                  process's umask in the usual way: the permissions
 *                  of the created file are (mode & ~umask)
 *
 *                  NOTE, the above is not true. We are dealing with 
 *                  an SMB server, which has no concept of a umask!
 *      
 * @return          Valid file handle, < 0 on error with errno set:
 *                  - ENOMEM  Out of memory
 *                  - EINVAL if an invalid parameter passed, like no 
 *                  file, or smbc_init not called.
 *                  - EEXIST  pathname already exists and O_CREAT and
 *                  O_EXCL were used.
 *                  - EISDIR  pathname  refers  to  a  directory  and
 *                  the access requested involved writing.
 *                  - EACCES  The requested access to the file is not
 *                  allowed 
 *                  - ENOENT  A directory component in pathname does 
 *                  not exist.
 *                  - ENODEV The requested share does not exist.
 * @see             smbc_open()
 *
 */

int smbc_creat(const char *furl, mode_t mode);

/**@ingroup file
 * Read from a file using an opened file handle.
 *
 * @param fd        Open file handle from smbc_open() or smbc_creat()
 *
 * @param buf       Pointer to buffer to recieve read data
 *
 * @param bufsize   Size of buf in bytes
 *
 * @return          Number of bytes read, < 0 on error with errno set:
 *                  - EISDIR fd refers to a directory
 *                  - EBADF  fd  is  not  a valid file descriptor or 
 *                  is not open for reading.
 *                  - EINVAL fd is attached to an object which is 
 *                  unsuitable for reading, or no buffer passed or
 *                  smbc_init not called.
 *
 * @see             smbc_open(), smbc_write()
 *
 */
ssize_t smbc_read(int fd, void *buf, size_t bufsize);


/**@ingroup file
 * Write to a file using an opened file handle.
 *
 * @param fd        Open file handle from smbc_open() or smbc_creat()
 *
 * @param buf       Pointer to buffer to recieve read data
 *
 * @param bufsize   Size of buf in bytes
 *
 * @return          Number of bytes written, < 0 on error with errno set:
 *                  - EISDIR fd refers to a directory.
 *                  - EBADF  fd  is  not  a valid file descriptor or 
 *                  is not open for reading.
 *                  - EINVAL fd is attached to an object which is 
 *                  unsuitable for reading, or no buffer passed or
 *                  smbc_init not called.
 *
 * @see             smbc_open(), smbc_read()
 *
 */
ssize_t smbc_write(int fd, void *buf, size_t bufsize);


/**@ingroup file
 * Seek to a specific location in a file.
 *
 * @param fd        Open file handle from smbc_open() or smbc_creat()
 * 
 * @param offset    Offset in bytes from whence
 * 
 * @param whence    A location in the file:
 *                  - SEEK_SET The offset is set to offset bytes from
 *                  the beginning of the file
 *                  - SEEK_CUR The offset is set to current location 
 *                  plus offset bytes.
 *                  - SEEK_END The offset is set to the size of the 
 *                  file plus offset bytes.
 *
 * @return          Upon successful completion, lseek returns the 
 *                  resulting offset location as measured in bytes 
 *                  from the beginning  of the file. Otherwise, a value
 *                  of (off_t)-1 is returned and errno is set to 
 *                  indicate the error:
 *                  - EBADF  Fildes is not an open file descriptor.
 *                  - EINVAL Whence is not a proper value or smbc_init
 *                    not called.
 *
 * @todo Are all the whence values really supported?
 * 
 * @todo Are errno values complete and correct?
 */
off_t smbc_lseek(int fd, off_t offset, int whence);


/**@ingroup file
 * Close an open file handle.
 *
 * @param fd        The file handle to close
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EBADF  fd isn't a valid open file descriptor
 *                  - EINVAL smbc_init() failed or has not been called
 *
 * @see             smbc_open(), smbc_creat()
 */
int smbc_close(int fd);


/**@ingroup directory
 * Unlink (delete) a file or directory.
 *
 * @param furl      The smb url of the file to delete
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EACCES or EPERM Write  access  to the directory 
 *                  containing pathname is not allowed or one  
 *                  of  the  directories in pathname did not allow
 *                  search (execute) permission
 *                  - ENOENT A directory component in pathname does
 *                  not exist
 *                  - EINVAL NULL was passed in the file param or
 *                    smbc_init not called.
 *                  - EACCES You do not have access to the file
 *                  - ENOMEM Insufficient kernel memory was available
 *
 * @see             smbc_rmdir()s
 *
 * @todo Are errno values complete and correct?
 */
int smbc_unlink(const char *furl);


/**@ingroup directory
 * Rename or move a file or directory.
 * 
 * @param ourl      The original smb url (source url) of file or 
 *                  directory to be moved
 * 
 * @param nurl      The new smb url (destination url) of the file
 *                  or directory after the move.  Currently nurl must
 *                  be on the same share as ourl.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EISDIR nurl is an existing directory, but ourl is
 *                  not a directory.
 *                  - EEXIST nurl is  a  non-empty directory, 
 *                  i.e., contains entries other than "." and ".."
 *                  - EINVAL The  new  url  contained  a path prefix 
 *                  of the old, or, more generally, an  attempt was
 *                  made  to make a directory a subdirectory of itself
 *                  or smbc_init not called.
 *                  - ENOTDIR A component used as a directory in ourl 
 *                  or nurl path is not, in fact, a directory.  Or, 
 *                  ourl  is a directory, and newpath exists but is not
 *                  a directory.
 *                  - EACCES or EPERM Write access to the directory 
 *                  containing ourl or nurl is not allowed for the 
 *                  process's effective uid,  or  one of the 
 *                  directories in ourl or nurl did not allow search
 *                  (execute) permission,  or ourl  was  a  directory
 *                  and did not allow write permission.
 *                  - ENOENT A  directory component in ourl or nurl 
 *                  does not exist.
 *                  - EXDEV Rename across shares not supported.
 *                  - ENOMEM Insufficient kernel memory was available.
 *                  - EEXIST The target file, nurl, already exists.
 *
 *
 * @todo Are we going to support copying when urls are not on the same
 *       share?  I say no... NOTE. I agree for the moment.
 *
 */
int smbc_rename(const char *ourl, const char *nurl);


/**@ingroup directory
 * Open a directory used to obtain directory entries.
 *
 * @param durl      The smb url of the directory to open
 *
 * @return          Valid directory handle. < 0 on error with errno set:
 *                  - EACCES Permission denied.
 *                  - EINVAL A NULL file/URL was passed, or the URL would
 *                  not parse, or was of incorrect form or smbc_init not
 *                  called.
 *                  - ENOENT durl does not exist, or name is an 
 *                  - ENOMEM Insufficient memory to complete the 
 *                  operation.                              
 *                  - ENOTDIR name is not a directory.
 *                  - EPERM the workgroup could not be found.
 *                  - ENODEV the workgroup or server could not be found.
 *
 * @see             smbc_getdents(), smbc_readdir(), smbc_closedir()
 *
 */
int smbc_opendir(const char *durl);


/**@ingroup directory
 * Close a directory handle opened by smbc_opendir().
 *
 * @param dh        Directory handle to close
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EBADF dh is an invalid directory handle
 *
 * @see             smbc_opendir()
 */
int smbc_closedir(int dh);


/**@ingroup directory
 * Get multiple directory entries.
 *
 * smbc_getdents() reads as many dirent structures from the an open 
 * directory handle into a specified memory area as will fit.
 *
 * @param dh        Valid directory as returned by smbc_opendir()
 *
 * @param dirp      pointer to buffer that will receive the directory
 *                  entries.
 * 
 * @param count     The size of the dirp buffer in bytes
 *
 * @returns         If any dirents returned, return will indicate the
 *                  total size. If there were no more dirents available,
 *                  0 is returned. < 0 indicates an error.
 *                  - EBADF  Invalid directory handle
 *                  - EINVAL Result buffer is too small or smbc_init
 *                  not called.
 *                  - ENOENT No such directory.
 * @see             , smbc_dirent, smbc_readdir(), smbc_open()
 *
 * @todo Are errno values complete and correct?
 *
 * @todo Add example code so people know how to parse buffers.
 */
int smbc_getdents(unsigned int dh, struct smbc_dirent *dirp, int count);


/**@ingroup directory
 * Get a single directory entry.
 *
 * @param dh        Valid directory as returned by smbc_opendir()
 *
 * @return          A pointer to a smbc_dirent structure, or NULL if an
 *                  error occurs or end-of-directory is reached:
 *                  - EBADF Invalid directory handle
 *                  - EINVAL smbc_init() failed or has not been called
 *
 * @see             smbc_dirent, smbc_getdents(), smbc_open()
 */
struct smbc_dirent* smbc_readdir(unsigned int dh);


/**@ingroup directory
 * Get the current directory offset.
 *
 * smbc_telldir() may be used in conjunction with smbc_readdir() and
 * smbc_lseekdir().
 *
 * @param dh        Valid directory as returned by smbc_opendir()
 *
 * @return          The current location in the directory stream or -1
 *                  if an error occur.  The current location is not
 *                  an offset. Becuase of the implementation, it is a 
 *                  handle that allows the library to find the entry
 *                  later.
 *                  - EBADF dh is not a valid directory handle
 *                  - EINVAL smbc_init() failed or has not been called
 *                  - ENOTDIR if dh is not a directory
 *
 * @see             smbc_readdir()
 *
 */
off_t smbc_telldir(int dh);


/**@ingroup directory
 * lseek on directories.
 *
 * smbc_lseekdir() may be used in conjunction with smbc_readdir() and
 * smbc_telldir(). (rewind by smbc_lseekdir(fd, NULL))
 *
 * @param fd        Valid directory as returned by smbc_opendir()
 * 
 * @param offset    The offset (as returned by smbc_telldir). Can be
 *                  NULL, in which case we will rewind
 *
 * @return          0 on success, -1 on failure
 *                  - EBADF dh is not a valid directory handle
 *                  - ENOTDIR if dh is not a directory
 *                  - EINVAL offset did not refer to a valid dirent or
 *                    smbc_init not called.
 *
 * @see             smbc_telldir()
 *
 *
 * @todo In what does the reture and errno values mean?
 */
int smbc_lseekdir(int fd, off_t offset);

/**@ingroup directory
 * Create a directory.
 *
 * @param durl      The url of the directory to create
 *
 * @param mode      Specifies  the  permissions to use. It is modified
 *                  by the process's umask in the usual way: the 
 *                  permissions of the created file are (mode & ~umask).
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EEXIST directory url already exists
 *                  - EACCES The parent directory does not allow write
 *                  permission to the process, or one of the directories
 *                  - ENOENT A directory component in pathname does not
 *                  exist.
 *                  - EINVAL NULL durl passed or smbc_init not called.
 *                  - ENOMEM Insufficient memory was available.
 *
 * @see             smbc_rmdir()
 *
 */
int smbc_mkdir(const char *durl, mode_t mode);


/**@ingroup directory
 * Remove a directory.
 * 
 * @param durl      The smb url of the directory to remove
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EACCES or EPERM Write access to the directory
 *                  containing pathname was not allowed.
 *                  - EINVAL durl is NULL or smbc_init not called.
 *                  - ENOENT A directory component in pathname does not
 *                  exist.
 *                  - ENOTEMPTY directory contains entries.
 *                  - ENOMEM Insufficient kernel memory was available.
 *
 * @see             smbc_mkdir(), smbc_unlink() 
 *
 * @todo Are errno values complete and correct?
 */
int smbc_rmdir(const char *durl);


/**@ingroup attribute
 * Get information about a file or directory.
 *
 * @param url       The smb url to get information for
 *
 * @param st        pointer to a buffer that will be filled with 
 *                  standard Unix struct stat information.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - ENOENT A component of the path file_name does not
 *                  exist.
 *                  - EINVAL a NULL url was passed or smbc_init not called.
 *                  - EACCES Permission denied.
 *                  - ENOMEM Out of memory
 *                  - ENOTDIR The target dir, url, is not a directory.
 *
 * @see             Unix stat()
 *
 */
int smbc_stat(const char *url, struct stat *st);


/**@ingroup attribute
 * Get file information via an file descriptor.
 * 
 * @param fd        Open file handle from smbc_open() or smbc_creat()
 *
 * @param st        pointer to a buffer that will be filled with 
 *                  standard Unix struct stat information.
 * 
 * @return          EBADF  filedes is bad.
 *                  - EACCES Permission denied.
 *                  - EBADF fd is not a valid file descriptor
 *                  - EINVAL Problems occurred in the underlying routines
 *                    or smbc_init not called.
 *                  - ENOMEM Out of memory
 *
 * @see             smbc_stat(), Unix stat()
 *
 */
int smbc_fstat(int fd, struct stat *st);


/**@ingroup attribue
 * Change the ownership of a file or directory.
 *
 * @param url       The smb url of the file or directory to change 
 *                  ownership of.
 *
 * @param owner     I have no idea?
 *
 * @param group     I have not idea?
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EPERM  The effective UID does not match the owner
 *                  of the file, and is not zero; or the owner or group
 *                  were specified incorrectly.
 *                  - ENOENT The file does not exist.
 *                  - ENOMEM Insufficient was available.
 *                  - ENOENT file or directory does not exist
 *
 * @todo Are we actually going to be able to implement this function
 *
 * @todo How do we abstract owner and group uid and gid?
 *
 */
int smbc_chown(const char *url, uid_t owner, gid_t group);


/**@ingroup attribute
 * Change the permissions of a file.
 *
 * @param url       The smb url of the file or directory to change
 *                  permissions of
 * 
 * @param mode      The permissions to set:
 *                  - Put good explaination of permissions here!
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EPERM  The effective UID does not match the owner
 *                  of the file, and is not zero
 *                  - ENOENT The file does not exist.
 *                  - ENOMEM Insufficient was available.
 *                  - ENOENT file or directory does not exist
 *
 * @todo Actually implement this fuction?
 *
 * @todo Are errno values complete and correct?
 */
int smbc_chmod(const char *url, mode_t mode);

/**@ingroup attribute
 * Change the last modification time on a file
 *
 * @param url       The smb url of the file or directory to change
 *                  the modification time of
 * 
 * @param tbuf      A timeval structure which contains the desired
 *                  modification time.  NOTE: Only the tv_sec field is
 *                  used.  The tv_usec (microseconds) portion is ignored.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - EPERM  Permission was denied.
 *
 */
int smbc_utimes(const char *url, struct timeval *tbuf);

#ifdef HAVE_UTIME_H
/**@ingroup attribute
 * Change the last modification time on a file
 *
 * @param url       The smb url of the file or directory to change
 *                  the modification time of
 * 
 * @param utbuf     A utimebuf structure which contains the desired
 *                  modification time.  NOTE: Although the structure contains
 *                  an access time as well, the access time value is ignored.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *
 */
int smbc_utime(const char *fname, struct utimbuf *utbuf);
#endif

/**@ingroup attribute
 * Set extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list)
 *
 * @param url       The smb url of the file or directory to set extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be changed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter should contain a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     The value to be assigned to the specified attribute name.
 *                  This buffer should contain only the attribute value if the
 *                  name was of the "system.nt_sec_desc.<attribute_name>"
 *                  form.  If the name was of the "system.nt_sec_desc.*" form
 *                  then a complete security descriptor, with name:value pairs
 *                  separated by tabs, commas, or newlines (not spaces!),
 *                  should be provided in this value buffer.  A complete
 *                  security descriptor will contain one or more entries
 *                  selected from the following:
 *
 *                    REVISION:<revision number>
 *                    OWNER:<sid or name>
 *                    GROUP:<sid or name>
 *                    ACL:<sid or name>:<type>/<flags>/<mask>
 *
 *                  The  revision of the ACL specifies the internal Windows NT
 *                  ACL revision for the security descriptor. If not specified
 *                  it defaults to  1.  Using values other than 1 may cause
 *                  strange behaviour.
 *
 *                  The owner and group specify the owner and group sids for
 *                  the object. If the attribute name (either '*+' with a
 *                  complete security descriptor, or individual 'owner+' or
 *                  'group+' attribute names) ended with a plus sign, the
 *                  specified name is resolved to a SID value, using the
 *                  server on which the file or directory resides.  Otherwise,
 *                  the value should be provided in SID-printable format as
 *                  S-1-x-y-z, and is used directly.  The <sid or name>
 *                  associated with the ACL: attribute should be provided
 *                  similarly.
 *
 * @param size      The number of the bytes of data in the value buffer
 *
 * @param flags     A bit-wise OR of zero or more of the following:
 *                    SMBC_XATTR_FLAG_CREATE -
 *                      fail if the named attribute already exists
 *                    SMBC_XATTR_FLAG_REPLACE -
 *                      fail if the attribute does not already exist
 *
 *                  If neither flag is specified, the specified attributes
 *                  will be added or replace existing attributes of the same
 *                  name, as necessary.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            Attribute names are compared in a case-insensitive
 *                  fashion.  All of the following are equivalent, although
 *                  the all-lower-case name is the preferred format:
 *                    system.nt_sec_desc.owner
 *                    SYSTEM.NT_SEC_DESC.OWNER
 *                    sYsTeM.nt_sEc_desc.owNER
 *
 */
int smbc_setxattr(const char *url,
                  const char *name,
                  const void *value,
                  size_t size,
                  int flags);


/**@ingroup attribute
 * Set extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list).  The
 * POSIX function which this maps to would act on a symbolic link rather than
 * acting on what the symbolic link points to, but with no symbolic links in
 * SMB file systems, this function is functionally identical to
 * smbc_setxattr().
 *
 * @param url       The smb url of the file or directory to set extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be changed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter should contain a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     The value to be assigned to the specified attribute name.
 *                  This buffer should contain only the attribute value if the
 *                  name was of the "system.nt_sec_desc.<attribute_name>"
 *                  form.  If the name was of the "system.nt_sec_desc.*" form
 *                  then a complete security descriptor, with name:value pairs
 *                  separated by tabs, commas, or newlines (not spaces!),
 *                  should be provided in this value buffer.  A complete
 *                  security descriptor will contain one or more entries
 *                  selected from the following:
 *
 *                    REVISION:<revision number>
 *                    OWNER:<sid or name>
 *                    GROUP:<sid or name>
 *                    ACL:<sid or name>:<type>/<flags>/<mask>
 *
 *                  The  revision of the ACL specifies the internal Windows NT
 *                  ACL revision for the security descriptor. If not specified
 *                  it defaults to  1.  Using values other than 1 may cause
 *                  strange behaviour.
 *
 *                  The owner and group specify the owner and group sids for
 *                  the object. If the attribute name (either '*+' with a
 *                  complete security descriptor, or individual 'owner+' or
 *                  'group+' attribute names) ended with a plus sign, the
 *                  specified name is resolved to a SID value, using the
 *                  server on which the file or directory resides.  Otherwise,
 *                  the value should be provided in SID-printable format as
 *                  S-1-x-y-z, and is used directly.  The <sid or name>
 *                  associated with the ACL: attribute should be provided
 *                  similarly.
 *
 * @param size      The number of the bytes of data in the value buffer
 *
 * @param flags     A bit-wise OR of zero or more of the following:
 *                    SMBC_XATTR_FLAG_CREATE -
 *                      fail if the named attribute already exists
 *                    SMBC_XATTR_FLAG_REPLACE -
 *                      fail if the attribute does not already exist
 *
 *                  If neither flag is specified, the specified attributes
 *                  will be added or replace existing attributes of the same
 *                  name, as necessary.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            Attribute names are compared in a case-insensitive
 *                  fashion.  All of the following are equivalent, although
 *                  the all-lower-case name is the preferred format:
 *                    system.nt_sec_desc.owner
 *                    SYSTEM.NT_SEC_DESC.OWNER
 *                    sYsTeM.nt_sEc_desc.owNER
 *
 */
int smbc_lsetxattr(const char *url,
                   const char *name,
                   const void *value,
                   size_t size,
                   int flags);


/**@ingroup attribute
 * Set extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list)
 *
 * @param fd        A file descriptor associated with an open file (as
 *                  previously returned by smbc_open(), to get extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be changed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter should contain a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     The value to be assigned to the specified attribute name.
 *                  This buffer should contain only the attribute value if the
 *                  name was of the "system.nt_sec_desc.<attribute_name>"
 *                  form.  If the name was of the "system.nt_sec_desc.*" form
 *                  then a complete security descriptor, with name:value pairs
 *                  separated by tabs, commas, or newlines (not spaces!),
 *                  should be provided in this value buffer.  A complete
 *                  security descriptor will contain one or more entries
 *                  selected from the following:
 *
 *                    REVISION:<revision number>
 *                    OWNER:<sid or name>
 *                    GROUP:<sid or name>
 *                    ACL:<sid or name>:<type>/<flags>/<mask>
 *
 *                  The  revision of the ACL specifies the internal Windows NT
 *                  ACL revision for the security descriptor. If not specified
 *                  it defaults to  1.  Using values other than 1 may cause
 *                  strange behaviour.
 *
 *                  The owner and group specify the owner and group sids for
 *                  the object. If the attribute name (either '*+' with a
 *                  complete security descriptor, or individual 'owner+' or
 *                  'group+' attribute names) ended with a plus sign, the
 *                  specified name is resolved to a SID value, using the
 *                  server on which the file or directory resides.  Otherwise,
 *                  the value should be provided in SID-printable format as
 *                  S-1-x-y-z, and is used directly.  The <sid or name>
 *                  associated with the ACL: attribute should be provided
 *                  similarly.
 *
 * @param size      The number of the bytes of data in the value buffer
 *
 * @param flags     A bit-wise OR of zero or more of the following:
 *                    SMBC_XATTR_FLAG_CREATE -
 *                      fail if the named attribute already exists
 *                    SMBC_XATTR_FLAG_REPLACE -
 *                      fail if the attribute does not already exist
 *
 *                  If neither flag is specified, the specified attributes
 *                  will be added or replace existing attributes of the same
 *                  name, as necessary.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            Attribute names are compared in a case-insensitive
 *                  fashion.  All of the following are equivalent, although
 *                  the all-lower-case name is the preferred format:
 *                    system.nt_sec_desc.owner
 *                    SYSTEM.NT_SEC_DESC.OWNER
 *                    sYsTeM.nt_sEc_desc.owNER
 *
 */
int smbc_fsetxattr(int fd,
                   const char *name,
                   const void *value,
                   size_t size,
                   int flags);


/**@ingroup attribute
 * Get extended attributes for a file.
 *
 * @param url       The smb url of the file or directory to get extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be retrieved.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     A pointer to a buffer in which the value of the specified
 *                  attribute will be placed (unless size is zero).
 *
 * @param size      The size of the buffer pointed to by value.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold the attribute value will be returned,
 *                  but nothing will be placed into the value buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_getxattr(const char *url,
                  const char *name,
                  const void *value,
                  size_t size);


/**@ingroup attribute
 * Get extended attributes for a file.  The POSIX function which this maps to
 * would act on a symbolic link rather than acting on what the symbolic link
 * points to, but with no symbolic links in SMB file systems, this function
 * is functionally identical to smbc_getxattr().
 *
 * @param url       The smb url of the file or directory to get extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be retrieved.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     A pointer to a buffer in which the value of the specified
 *                  attribute will be placed (unless size is zero).
 *
 * @param size      The size of the buffer pointed to by value.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold the attribute value will be returned,
 *                  but nothing will be placed into the value buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_lgetxattr(const char *url,
                   const char *name,
                   const void *value,
                   size_t size);


/**@ingroup attribute
 * Get extended attributes for a file.
 *
 * @param fd        A file descriptor associated with an open file (as
 *                  previously returned by smbc_open(), to get extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be retrieved.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @param value     A pointer to a buffer in which the value of the specified
 *                  attribute will be placed (unless size is zero).
 *
 * @param size      The size of the buffer pointed to by value.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold the attribute value will be returned,
 *                  but nothing will be placed into the value buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL  The client library is not properly initialized
 *                            or one of the parameters is not of a correct
 *                            form
 *                  - ENOMEM No memory was available for internal needs
 *                  - EEXIST  If the attribute already exists and the flag
 *                            SMBC_XATTR_FLAG_CREAT was specified
 *                  - ENOATTR If the attribute does not exist and the flag
 *                            SMBC_XATTR_FLAG_REPLACE was specified
 *                  - EPERM   Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_fgetxattr(int fd,
                   const char *name,
                   const void *value,
                   size_t size);


/**@ingroup attribute
 * Remove extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list)
 *
 * @param url       The smb url of the file or directory to remove the extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be removed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_removexattr(const char *url,
                     const char *name);


/**@ingroup attribute
 * Remove extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list) The POSIX
 * function which this maps to would act on a symbolic link rather than acting
 * on what the symbolic link points to, but with no symbolic links in SMB file
 * systems, this function is functionally identical to smbc_removexattr().
 *
 * @param url       The smb url of the file or directory to remove the extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be removed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_lremovexattr(const char *url,
                      const char *name);


/**@ingroup attribute
 * Remove extended attributes for a file.  This is used for modifying a file's
 * security descriptor (i.e. owner, group, and access control list)
 *
 * @param fd        A file descriptor associated with an open file (as
 *                  previously returned by smbc_open(), to get extended
 *                  attributes for.
 * 
 * @param name      The name of an attribute to be removed.  Names are of
 *                  one of the following forms:
 *
 *                     system.nt_sec_desc.<attribute name>
 *                     system.nt_sec_desc.*
 *                     system.nt_sec_desc.*+
 *
 *                  where <attribute name> is one of:
 *
 *                     revision
 *                     owner
 *                     owner+
 *                     group
 *                     group+
 *                     acl:<name or sid>
 *                     acl+:<name or sid>
 *
 *                  In the forms "system.nt_sec_desc.*" and
 *                  "system.nt_sec_desc.*+", the asterisk and plus signs are
 *                  literal, i.e. the string is provided exactly as shown, and
 *                  the value parameter will return a complete security
 *                  descriptor with name:value pairs separated by tabs,
 *                  commas, or newlines (not spaces!).
 *
 *                  The plus sign ('+') indicates that SIDs should be mapped
 *                  to names.  Without the plus sign, SIDs are not mapped;
 *                  rather they are simply converted to a string format.
 *
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 */
int smbc_fremovexattr(int fd,
                      const char *name);


/**@ingroup attribute
 * List the supported extended attribute names associated with a file
 *
 * @param url       The smb url of the file or directory to list the extended
 *                  attributes for.
 *
 * @param list      A pointer to a buffer in which the list of attributes for
 *                  the specified file or directory will be placed (unless
 *                  size is zero).
 *
 * @param size      The size of the buffer pointed to by list.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold all of the attribute names will be
 *                  returned, but nothing will be placed into the list buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            This function always returns all attribute names supported
 *                  by NT file systems, regardless of wether the referenced
 *                  file system supports extended attributes (e.g. a Windows
 *                  2000 machine supports extended attributes if NTFS is used,
 *                  but not if FAT is used, and Windows 98 doesn't support
 *                  extended attributes at all.  Whether this is a feature or
 *                  a bug is yet to be decided.
 */
int smbc_listxattr(const char *url,
                   char *list,
                   size_t size);

/**@ingroup attribute
 * List the supported extended attribute names associated with a file The
 * POSIX function which this maps to would act on a symbolic link rather than
 * acting on what the symbolic link points to, but with no symbolic links in
 * SMB file systems, this function is functionally identical to
 * smbc_listxattr().
 *
 * @param url       The smb url of the file or directory to list the extended
 *                  attributes for.
 *
 * @param list      A pointer to a buffer in which the list of attributes for
 *                  the specified file or directory will be placed (unless
 *                  size is zero).
 *
 * @param size      The size of the buffer pointed to by list.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold all of the attribute names will be
 *                  returned, but nothing will be placed into the list buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            This function always returns all attribute names supported
 *                  by NT file systems, regardless of wether the referenced
 *                  file system supports extended attributes (e.g. a Windows
 *                  2000 machine supports extended attributes if NTFS is used,
 *                  but not if FAT is used, and Windows 98 doesn't support
 *                  extended attributes at all.  Whether this is a feature or
 *                  a bug is yet to be decided.
 */
int smbc_llistxattr(const char *url,
                    char *list,
                    size_t size);

/**@ingroup attribute
 * List the supported extended attribute names associated with a file
 *
 * @param fd        A file descriptor associated with an open file (as
 *                  previously returned by smbc_open(), to get extended
 *                  attributes for.
 * 
 * @param list      A pointer to a buffer in which the list of attributes for
 *                  the specified file or directory will be placed (unless
 *                  size is zero).
 *
 * @param size      The size of the buffer pointed to by list.  This parameter
 *                  may also be zero, in which case the size of the buffer
 *                  required to hold all of the attribute names will be
 *                  returned, but nothing will be placed into the list buffer.
 * 
 * @return          0 on success, < 0 on error with errno set:
 *                  - EINVAL The client library is not properly initialized
 *                  - ENOMEM No memory was available for internal needs
 *                  - EPERM  Permission was denied.
 *                  - ENOTSUP The referenced file system does not support
 *                            extended attributes
 *
 * @note            This function always returns all attribute names supported
 *                  by NT file systems, regardless of wether the referenced
 *                  file system supports extended attributes (e.g. a Windows
 *                  2000 machine supports extended attributes if NTFS is used,
 *                  but not if FAT is used, and Windows 98 doesn't support
 *                  extended attributes at all.  Whether this is a feature or
 *                  a bug is yet to be decided.
 */
int smbc_flistxattr(int fd,
                    char *list,
                    size_t size);

/**@ingroup print
 * Print a file given the name in fname. It would be a URL ...
 * 
 * @param fname     The URL of a file on a remote SMB server that the
 *                  caller wants printed
 *
 * @param printq    The URL of the print share to print the file to.
 *
 * @return          0 on success, < 0 on error with errno set:         
 *
 *                  - EINVAL fname or printq was NULL or smbc_init not
 *                    not called.
 *                  and errors returned by smbc_open
 *
 */                                     
int smbc_print_file(const char *fname, const char *printq);

/**@ingroup print
 * Open a print file that can be written to by other calls. This simply
 * does an smbc_open call after checking if there is a file name on the
 * URI. If not, a temporary name is added ...
 *
 * @param fname     The URL of the print share to print to?
 *
 * @returns         A file handle for the print file if successful.
 *                  Returns -1 if an error ocurred and errno has the values
 *                  - EINVAL fname was NULL or smbc_init not called.
 *                  - all errors returned by smbc_open
 *
 */
int smbc_open_print_job(const char *fname);

/**@ingroup print
 * List the print jobs on a print share, for the moment, pass a callback 
 *
 * @param purl      The url of the print share to list the jobs of
 * 
 * @param fn        Callback function the receives printjob info
 * 
 * @return          0 on success, < 0 on error with errno set: 
 *                  - EINVAL fname was NULL or smbc_init not called
 *                  - EACCES ???
 */
int smbc_list_print_jobs(const char *purl, smbc_list_print_job_fn fn);

/**@ingroup print
 * Delete a print job 
 *
 * @param purl      Url of the print share
 *
 * @param id        The id of the job to delete
 *
 * @return          0 on success, < 0 on error with errno set: 
 *                  - EINVAL fname was NULL or smbc_init not called
 *
 * @todo    what errno values are possible here?
 */
int smbc_unlink_print_job(const char *purl, int id);

/**@ingroup callback
 * Remove a server from the cached server list it's unused.
 *
 * @param context    pointer to smb context
 *
 * @param srv        pointer to server to remove
 *
 * @return On success, 0 is returned. 1 is returned if the server could not
 *         be removed. Also useable outside libsmbclient.
 */
int smbc_remove_unused_server(SMBCCTX * context, SMBCSRV * srv);

#ifdef __cplusplus
}
#endif

/**@ingroup directory
 * Convert strings of %xx to their single character equivalent.
 *
 * @param dest      A pointer to a buffer in which the resulting decoded
 *                  string should be placed.  This may be a pointer to the
 *                  same buffer as src_segment.
 * 
 * @param src       A pointer to the buffer containing the URL to be decoded.
 *                  Any %xx sequences herein are converted to their single
 *                  character equivalent.  Each 'x' must be a valid hexadecimal
 *                  digit, or that % sequence is left undecoded.
 *
 * @param max_dest_len
 *                  The size of the buffer pointed to by dest_segment.
 * 
 * @return          The number of % sequences which could not be converted
 *                  due to lack of two following hexadecimal digits.
 */
#ifdef __cplusplus
extern "C" {
#endif
int
smbc_urldecode(char *dest, char * src, size_t max_dest_len);
#ifdef __cplusplus
}
#endif


/*
 * Convert any characters not specifically allowed in a URL into their %xx
 * equivalent.
 *
 * @param dest      A pointer to a buffer in which the resulting encoded
 *                  string should be placed.  Unlike smbc_urldecode(), this
 *                  must be a buffer unique from src.
 * 
 * @param src       A pointer to the buffer containing the string to be encoded.
 *                  Any character not specifically allowed in a URL is converted
 *                  into its hexadecimal value and encoded as %xx.
 *
 * @param max_dest_len
 *                  The size of the buffer pointed to by dest_segment.
 * 
 * @returns         The remaining buffer length.
 */
#ifdef __cplusplus
extern "C" {
#endif
int
smbc_urlencode(char * dest, char * src, int max_dest_len);
#ifdef __cplusplus
}
#endif


/**@ingroup directory
 * Return the version of the linked Samba code, and thus the version of the
 * libsmbclient code.
 *
 * @return          The version string.
 */
#ifdef __cplusplus
extern "C" {
#endif
const char *
smbc_version(void);
#ifdef __cplusplus
}
#endif


#endif /* SMBCLIENT_H_INCLUDED */