transmission/libtransmission/transmission.h

/******************************************************************************
 * $Id$
 *
 * Copyright (c) 2005-2007 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#ifndef TR_TRANSMISSION_H
#define TR_TRANSMISSION_H 1

#ifdef __cplusplus
extern "C" {
#endif

#include "version.h"

#include <inttypes.h>
#ifndef PRId64
# define PRId64 "lld"
#endif
#ifndef PRIu64
# define PRIu64 "llu"
#endif
#include <time.h>

#define SHA_DIGEST_LENGTH 20
#ifdef __BEOS__
# include <StorageDefs.h>
# define MAX_PATH_LENGTH  B_FILE_NAME_LENGTH
#else
# define MAX_PATH_LENGTH  1024
#endif

#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif

#if defined(__MINGW__)
#define TR_PATH_DELIMITER '\\'
#define TR_PATH_DELIMITER_STR "\\"
#else
#define TR_PATH_DELIMITER '/'
#define TR_PATH_DELIMITER_STR "/"
#endif

#define TR_DEFAULT_PORT   9090

#define TR_PEER_FROM__MAX       4
#define TR_PEER_FROM_INCOMING   0 /* connections made to the listening port */
#define TR_PEER_FROM_TRACKER    1 /* peers received from a tracker */
#define TR_PEER_FROM_CACHE      2 /* peers read from the peer cache */
#define TR_PEER_FROM_PEX        3 /* peers discovered via PEX */

/***********************************************************************
 * Error codes
 **********************************************************************/
/* General errors */
#define TR_OK                       0x00000000
#define TR_ERROR                    0x81000000
#define TR_ERROR_ASSERT             0x82000000
/* I/O errors */
#define TR_ERROR_IO_MASK            0x000000FF
#define TR_ERROR_IO_PARENT          ((1<<31) | (1<<0))
#define TR_ERROR_IO_PERMISSIONS     ((1<<31) | (1<<1))
#define TR_ERROR_IO_SPACE           ((1<<31) | (1<<2))
#define TR_ERROR_IO_FILE_TOO_BIG    ((1<<31) | (1<<3))
#define TR_ERROR_IO_OPEN_FILES      ((1<<31) | (1<<4))
#define TR_ERROR_IO_DUP_DOWNLOAD    ((1<<31) | (1<<5))
#define TR_ERROR_IO_OTHER           ((1<<31) | (1<<6))
/* Misc */
#define TR_ERROR_TC_MASK            0x00000F00
#define TR_ERROR_TC_ERROR           0x80000100
#define TR_ERROR_TC_WARNING         0x80000200

#define TR_ERROR_ISSET( num, code ) ( (code) == ( (code) & (num) ) )

/***********************************************************************
 * tr_init
 ***********************************************************************
 * Initializes a libtransmission instance. Returns a obscure handle to
 * be passed to all functions below. The tag argument is a short string
 * unique to the program invoking tr_init(), it is currently used as
 * part of saved torrent files' names to prevent one frontend from
 * deleting a torrent used by another. The following tags are used:
 *   beos cli daemon gtk macosx
 **********************************************************************/
typedef struct tr_handle_s tr_handle_t;
tr_handle_t * tr_init( const char * tag );

typedef struct tr_tracker_info_s tr_tracker_info_t;

/***********************************************************************
 * tr_setMessageLevel
 ***********************************************************************
 * Set the level of messages to be output or queued
 **********************************************************************/
#define TR_MSG_ERR 1
#define TR_MSG_INF 2
#define TR_MSG_DBG 3
void tr_setMessageLevel( int );
int tr_getMessageLevel( void );

/***********************************************************************
 * tr_setMessageQueuing
 ***********************************************************************
 * Enable or disable message queuing
 **********************************************************************/
typedef struct tr_msg_list_s tr_msg_list_t;
void tr_setMessageQueuing( int );

/***********************************************************************
 * tr_getQueuedMessages
 ***********************************************************************
 * Return a list of queued messages
 **********************************************************************/
tr_msg_list_t * tr_getQueuedMessages( void );
void tr_freeMessageList( tr_msg_list_t * list );

/***********************************************************************
 * tr_getPrefsDirectory
 ***********************************************************************
 * Returns the full path to a directory which can be used to store
 * preferences. The string belongs to libtransmission, do not free it.
 **********************************************************************/
const char * tr_getPrefsDirectory( void );

/***********************************************************************
 * tr_setBindPort
 ***********************************************************************
 * Sets the port to listen for incoming peer connections.
 * This can be safely called even with active torrents.
 **********************************************************************/
void tr_setBindPort( tr_handle_t *, int );

/***********************************************************************
 * tr_natTraversalEnable
 * tr_natTraversalDisable
 ***********************************************************************
 * Enable or disable NAT traversal using NAT-PMP or UPnP IGD.
 **********************************************************************/
void tr_natTraversalEnable( tr_handle_t *, int enable );

/***********************************************************************
 * tr_handleStatus
 ***********************************************************************
 * Returns some status info for the given handle.
 **********************************************************************/
typedef struct tr_handle_status_s tr_handle_status_t;
tr_handle_status_t * tr_handleStatus( tr_handle_t * );

/***********************************************************************
 * tr_setGlobalUploadLimit
 ***********************************************************************
 * Sets the total upload rate limit in KB/s
 **********************************************************************/
void tr_setGlobalUploadLimit( tr_handle_t *, int );

/***********************************************************************
 * tr_setGlobalDownloadLimit
 ***********************************************************************
 * Sets the total download rate limit in KB/s
 **********************************************************************/
void tr_setGlobalDownloadLimit( tr_handle_t *, int );

/***********************************************************************
 * tr_torrentCount
 ***********************************************************************
 * Returns the count of open torrents
 **********************************************************************/
int tr_torrentCount( tr_handle_t * h );


/***********************************************************************
 * tr_torrentIterate
 ***********************************************************************
 * Iterates on open torrents
 **********************************************************************/
typedef struct tr_torrent_s tr_torrent_t;
typedef void (*tr_callback_t) ( tr_torrent_t *, void * );
void tr_torrentIterate( tr_handle_t *, tr_callback_t, void * );

void tr_setUseCustomLimit( tr_torrent_t * tor, int limit );
void tr_setUploadLimit( tr_torrent_t * tor, int limit );
void tr_setDownloadLimit( tr_torrent_t * tor, int limit );

/***********************************************************************
 * Torrent Priorities
 **********************************************************************/

enum
{
    TR_PRI_DND    = -2, /* Do Not Download */
    TR_PRI_LOW    = -1,
    TR_PRI_NORMAL =  0, /* since NORMAL is 0, memset initializes nicely */
    TR_PRI_HIGH   =  1
};

typedef int8_t tr_priority_t;

/* priorities should be an array of tor->info.fileCount bytes,
 * each holding a value of TR_PRI_NORMAL, _HIGH, _LOW, or _DND. */
void tr_torrentSetFilePriorities ( tr_torrent_t *, const tr_priority_t * priorities );

/* single-file form of tr_torrentPrioritizeFiles.
 * priority must be one of TR_PRI_NORMAL, _HIGH, _LOW, or _DND */
void tr_torrentSetFilePriority( tr_torrent_t *, int file, tr_priority_t priority );

/* returns a malloc()ed array of tor->info.fileCount items,
 * each holding a value of TR_PRI_NORMAL, _HIGH, _LOW, or _DND.
   free the array when done. */
tr_priority_t* tr_torrentGetFilePriorities( const tr_torrent_t * );

/* single-file form of tr_torrentGetFilePriorities.
 * returns one of TR_PRI_NORMAL, _HIGH, _LOW, or _DND */
tr_priority_t tr_torrentGetFilePriority( const tr_torrent_t *, int file );

/* returns the priority for the specified piece,
 * as ranked by the number of files of various priorities in that piece.
 * a zero priority means DND */
tr_priority_t tr_torrentGetPiecePriority( const tr_torrent_t *, int pieceIndex );

/***********************************************************************
 * tr_torrentRates
 ***********************************************************************
 * Gets the total download and upload rates
 **********************************************************************/
void tr_torrentRates( tr_handle_t *, float *, float * );

/***********************************************************************
 * tr_close
 ***********************************************************************
 * Frees memory allocated by tr_init.
 **********************************************************************/
void tr_close( tr_handle_t * );

/***********************************************************************
 * tr_torrentInit
 ***********************************************************************
 * Opens and parses torrent file at 'path'. If the file exists and is
 * a valid torrent file, returns an handle and adds it to the list of
 * torrents (but doesn't start it). Returns NULL and sets *error
 * otherwise. If hash is not NULL and the torrent is already loaded
 * then it's 20-byte hash will be copied in. If the TR_FLAG_SAVE flag
 * is passed then a copy of the torrent file will be saved.
 **********************************************************************/
#define TR_EINVALID     1
#define TR_EUNSUPPORTED 2
#define TR_EDUPLICATE   3
#define TR_EOTHER       666
tr_torrent_t * tr_torrentInit( tr_handle_t  * handle,
                               const char   * metainfo_filename,
                               const char   * destination,
                               int            flags,
                               int          * setme_error );

typedef struct tr_info_s tr_info_t;

/**
 * Parses the specified metainfo file.
 *
 * Returns TR_OK if it parsed and can be added to Transmission.
 * Returns TR_INVALID if it couldn't be parsed.
 * Returns TR_EDUPLICATE if it parsed but can't be added.
 *
 * "destination" can be NULL if you don't need to know whether
 * or not the torrent can be added.
 *
 " "setme_info" can be NULL if you don't need the information.
 * If the metainfo can be parsed and setme_info is non-NULL,
 * it will be filled with the metadata's info.  You'll need to
 * call tr_metainfoFree( setme_info ) when done with it.
 */
int tr_torrentParse( const tr_handle_t  * handle,
                     const char         * metainfo_filename,
                     const char         * destination,
                     tr_info_t          * setme_info );

/**
 * Parses the cached metainfo file that matches the given hash string.
 * See tr_torrentParse() for a description of the arguments
 */
int
tr_torrentParseHash( const tr_handle_t  * h,
                     const char         * hashStr,
                     const char         * destination,
                     tr_info_t          * setme_info );


/***********************************************************************
 * tr_torrentInitData
 ***********************************************************************
 * Like tr_torrentInit, except the actual torrent data is passed in
 * instead of the filename.
 **********************************************************************/
tr_torrent_t * tr_torrentInitData( tr_handle_t *,
                                   const uint8_t * data, size_t size,
                                   const char * destination,
                                   int flags, int * error );

/***********************************************************************
 * tr_torrentInitSaved
 ***********************************************************************
 * Opens and parses a torrent file as with tr_torrentInit, only taking
 * the hash string of a saved torrent file instead of a filename. There
 * are currently no valid flags for this function.
 **********************************************************************/
tr_torrent_t * tr_torrentInitSaved( tr_handle_t *,
                                    const char * hashStr,
                                    const char * destination,
                                    int flags, int * error );

/***********************************************************************
 * tr_torrentDisablePex
 ***********************************************************************
 * Disable or enable peer exchange for this torrent. Peer exchange is
 * enabled by default, except for private torrents where pex is
 * disabled and cannot be enabled.
 **********************************************************************/
void tr_torrentDisablePex( tr_torrent_t *, int disable );

/***********************************************************************
 * tr_torrentScrape
 ***********************************************************************
 * Return torrent metainfo.
 **********************************************************************/
const tr_info_t * tr_torrentInfo( const tr_torrent_t * );

/***********************************************************************
 * tr_torrentScrape
 ***********************************************************************
 * Asks the tracker for the count of seeders and leechers. Returns 0
 * and fills 's' and 'l' if successful. Otherwise returns 1 if the
 * tracker doesn't support the scrape protocol, is unreachable or
 * replied with some error. tr_torrentScrape may block up to 20 seconds
 * before returning.
 **********************************************************************/
int tr_torrentScrape( tr_torrent_t *, int * s, int * l, int * d );

void   tr_torrentSetFolder( tr_torrent_t *, const char * );
const char * tr_torrentGetFolder( const tr_torrent_t * );

/***********************************************************************
 * tr_torrentStart
 ***********************************************************************
 * Starts downloading. The download is launched in a seperate thread,
 * therefore tr_torrentStart returns immediately.
 **********************************************************************/
void   tr_torrentStart( tr_torrent_t * );

/***********************************************************************
 * tr_torrentStop
 ***********************************************************************
 * Stops downloading and notices the tracker that we are leaving. The
 * thread keeps running while doing so.
 * The thread will eventually be joined, either:
 * - by tr_torrentStat when the tracker has been successfully noticed,
 * - by tr_torrentStat if the tracker could not be noticed within 60s,
 * - by tr_torrentClose if you choose to remove the torrent without
 *   waiting any further.
 **********************************************************************/
void tr_torrentStop( tr_torrent_t * );

/***********************************************************************
 * tr_getComplete, tr_getIncomplete and tr_getPartial
 ***********************************************************************
 * The first call after a torrent changed state returns 1. Returns 0
 * in other cases.
 **********************************************************************/
int tr_getIncomplete( tr_torrent_t * tor );
int tr_getDone( tr_torrent_t * tor );
int tr_getComplete( tr_torrent_t * tor );


/***********************************************************************
 * tr_manualUpdate
 ***********************************************************************
 * Reannounce to tracker regardless of wait interval
 **********************************************************************/
void tr_manualUpdate( tr_torrent_t * );

/***********************************************************************
 * tr_torrentStat
 ***********************************************************************
 * Returns a pointer to an tr_stat_t structure with updated information
 * on the torrent. The structure belongs to libtransmission (do not
 * free it) and is guaranteed to be unchanged until the next call to
 * tr_torrentStat.
 * The interface should call this function every second or so in order
 * to update itself.
 **********************************************************************/
typedef struct tr_stat_s tr_stat_t;
tr_stat_t * tr_torrentStat( tr_torrent_t * );

/***********************************************************************
 * tr_torrentPeers
 ***********************************************************************/
typedef struct tr_peer_stat_s tr_peer_stat_t;
tr_peer_stat_t * tr_torrentPeers( const tr_torrent_t *, int * peerCount );
void tr_torrentPeersFree( tr_peer_stat_t *, int peerCount );

/***********************************************************************
 * tr_torrentAvailability
 ***********************************************************************
 * Use this to draw an advanced progress bar which is 'size' pixels
 * wide. Fills 'tab' which you must have allocated: each byte is set
 * to either -1 if we have the piece, otherwise it is set to the number
 * of connected peers who have the piece.
 **********************************************************************/
void tr_torrentAvailability( const tr_torrent_t *, int8_t * tab, int size );

void tr_torrentAmountFinished( const tr_torrent_t * tor, float * tab, int size );

/***********************************************************************
 * tr_torrentCompletion
 ***********************************************************************
 * Returns the completion progress for each file in the torrent as an
 * array of floats the same size and order as in tr_info_t. Free the
 * array when done.
 **********************************************************************/
float * tr_torrentCompletion( const tr_torrent_t * );

float tr_torrentFileCompletion( const tr_torrent_t *, int fileIndex );

uint64_t tr_torrentFileBytesCompleted( const tr_torrent_t *, int fileIndex ); 


/***********************************************************************
 * tr_torrentRemoveSaved
 ***********************************************************************
 * Removes the saved copy of a torrent file for torrents which the
 * TR_FLAG_SAVE flag is set.
 **********************************************************************/
void tr_torrentRemoveSaved( tr_torrent_t * );

void tr_torrentRecheck( tr_torrent_t * );

/***********************************************************************
 * tr_torrentClose
 ***********************************************************************
 * Frees memory allocated by tr_torrentInit. If the torrent was running,
 * it is stopped first.
 **********************************************************************/
void tr_torrentClose( tr_torrent_t * );

/***********************************************************************
 * tr_info_s
 **********************************************************************/

typedef struct tr_file_s
{
    uint64_t length;                /* Length of the file, in bytes */
    char     name[MAX_PATH_LENGTH]; /* Path to the file */
    int8_t   priority;              /* TR_PRI_HIGH, _NORMAL, _LOW, or _DND */
    int      firstPiece;            /* We need pieces [firstPiece... */
    int      lastPiece;             /* ...lastPiece] to dl this file */
    uint64_t offset;                /* file begins at the torrent's nth byte */
}
tr_file_t;

typedef struct tr_piece_s
{
    uint8_t  hash[SHA_DIGEST_LENGTH];  /* pieces hash */
    int8_t   priority;                 /* TR_PRI_HIGH, _NORMAL, _LOW, or _DND */
}
tr_piece_t;
    
struct tr_info_s
{
    /* Path to torrent */
    char                 torrent[MAX_PATH_LENGTH];

    /* General info */
    uint8_t              hash[SHA_DIGEST_LENGTH];
    char                 hashString[2*SHA_DIGEST_LENGTH+1];
    char                 name[MAX_PATH_LENGTH];

    /* Flags */
#define TR_FLAG_SAVE    0x01 /* save a copy of the torrent file */
#define TR_FLAG_PRIVATE 0x02 /* do not share information for this torrent */
#define TR_FLAG_PAUSED  0x04 /* don't start the torrent when adding it */
    int                  flags;

    /* Tracker info */
    struct
    {
        tr_tracker_info_t * list;
        int                 count;
    }                  * trackerList;
    int                  trackerTiers;

    /* Torrent info */
    char                 comment[MAX_PATH_LENGTH];
    char                 creator[MAX_PATH_LENGTH];
    int                  dateCreated;

    /* Pieces info */
    int                  pieceSize;
    int                  pieceCount;
    uint64_t             totalSize;
    tr_piece_t         * pieces;

    /* Files info */
    int                  multifile;
    int                  fileCount;
    tr_file_t          * files;
};

typedef enum
{
    TR_CP_INCOMPLETE,   /* doesn't have all the desired pieces */
    TR_CP_DONE,         /* has all the pieces but the DND ones */
    TR_CP_COMPLETE      /* has every piece */
}
cp_status_t;

typedef enum
{
    TR_STATUS_CHECK_WAIT   = (1<<0), /* Waiting in queue to check files */
    TR_STATUS_CHECK        = (1<<1), /* Checking files */
    TR_STATUS_DOWNLOAD     = (1<<2), /* Downloading */
    TR_STATUS_DONE         = (1<<3), /* not at 100% so can't tell the tracker
                                        we're a seeder, but due to DND files
                                        there's nothing we want right now */
    TR_STATUS_SEED         = (1<<4), /* Seeding */
    TR_STATUS_STOPPING     = (1<<5), /* Stopping -- closing connections, etc. */
    TR_STATUS_STOPPED      = (1<<6)  /* Torrent is stopped */
}
torrent_status_t;

#define TR_STATUS_ACTIVE \
    (TR_STATUS_CHECK_WAIT|TR_STATUS_CHECK|TR_STATUS_DOWNLOAD|TR_STATUS_DONE|TR_STATUS_SEED)
#define TR_STATUS_INACTIVE \
    (TR_STATUS_STOPPING|TR_STATUS_STOPPED)

/***********************************************************************
 * tr_stat_s
 **********************************************************************/
struct tr_stat_s
{
    torrent_status_t    status;
    cp_status_t         cpStatus;

    int                 error;
    char                errorString[128];
    int                 cannotConnect;

    tr_tracker_info_t * tracker;

    float               percentComplete;
    float               percentDone;
    float               rateDownload;
    float               rateUpload;
    int                 eta;
    int                 peersTotal;
    int                 peersFrom[TR_PEER_FROM__MAX];
    int                 peersUploading;
    int                 peersDownloading;
    int                 seeders;
    int                 leechers;
    int                 completedFromTracker;

    uint64_t            left;
    uint64_t            downloaded;
    uint64_t            downloadedValid;
    uint64_t            uploaded;
    float               swarmspeed;

#define TR_RATIO_NA  -1
    float               ratio;
    
    uint64_t            startDate;
    uint64_t            activityDate;
};

struct tr_peer_stat_s
{
    char    addr[INET_ADDRSTRLEN];
    const char * client;
    
    int     isConnected;
    int     from;
    float   progress;
    int     port;
    
    int     isDownloading;
    int     isUploading;
    float   downloadFromRate;
    float   uploadToRate;
};

struct tr_msg_list_s
{
    int                    level;
    time_t                 when;
    char                 * message;
    struct tr_msg_list_s * next;
};

struct tr_tracker_info_s
{
    char * address;
    int    port;
    char * announce;
    char * scrape;
};

struct tr_handle_status_s
{
#define TR_NAT_TRAVERSAL_MAPPING        1
#define TR_NAT_TRAVERSAL_MAPPED         2
#define TR_NAT_TRAVERSAL_NOTFOUND       3
#define TR_NAT_TRAVERSAL_ERROR          4
#define TR_NAT_TRAVERSAL_UNMAPPING      5
#define TR_NAT_TRAVERSAL_DISABLED       6
#define TR_NAT_TRAVERSAL_IS_DISABLED( st ) \
  ( TR_NAT_TRAVERSAL_DISABLED == (st) || TR_NAT_TRAVERSAL_UNMAPPING == (st) )
    int natTraversalStatus;
    int publicPort;
};

#ifdef __TRANSMISSION__
#  include "internal.h"
#endif

#ifdef __cplusplus
}
#endif

#endif