transmission/daemon/remote.c

/*
 * This file Copyright (C) 2008 Charles Kerr <charles@rebelbase.com>
 *
 * This file is licensed by the GPL version 2.  Works owned by the
 * Transmission project are granted a special exemption to clause 2(b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id$
 */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* strcmp */

#include <unistd.h> /* getcwd */

#include <libevent/event.h>
#include <curl/curl.h>

#include <libtransmission/transmission.h>
#include <libtransmission/bencode.h>
#include <libtransmission/rpcimpl.h>
#include <libtransmission/json.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/utils.h>
#include <libtransmission/version.h>

#define MY_NAME "transmission-remote"
#define DEFAULT_HOST "localhost"
#define DEFAULT_PORT TR_DEFAULT_RPC_PORT

enum { TAG_LIST, TAG_DETAILS, TAG_FILES, TAG_PEERS };

static const char*
getUsage( void )
{
    return
        "Transmission " LONG_VERSION_STRING
        "  http://www.transmissionbt.com/\n"
        "A fast and easy BitTorrent client\n"
        "\n"
        "Usage: " MY_NAME
        " [host] [options]\n"
        "       "
        MY_NAME " [port] [options]\n"
                "       "
        MY_NAME " [host:port] [options]\n"
                "\n"
                "See the man page for detailed explanations and many examples.";
}

static tr_option opts[] =
{
    { 'a', "add",                  "Add torrent files",
      "a",  0, NULL                  },
    { 'b', "debug",                "Print debugging information",
      "b",  0, NULL                  },
    { 'd', "downlimit",            "Set the maximum download speed in KB/s",
      "d",  1, "<speed>"             },
    { 'D', "no-downlimit",         "Don't limit the download speed",
      "D",  0, NULL                  },
    { 910, "encryption-required",  "Encrypt all peer connections",
      "er", 0, NULL                  },
    { 911, "encryption-preferred", "Prefer encrypted peer connections",
      "ep", 0, NULL                  },
    { 912, "encryption-tolerated", "Prefer unencrypted peer connections",
      "et", 0, NULL                  },
    { 'f', "files",                "List the current torrent's files",
      "f",  0, NULL                  },
    { 'g', "get",                  "Mark files for download",
      "g",  1, "<files>"             },
    { 'G', "no-get",               "Mark files for not downloading",
      "G",  1, "<files>"             },
    { 'i', "info",                 "Show details of the current torrent(s)",
      "i",  0, NULL                  },
    { 'l', "list",                 "List all torrents",
      "l",  0, NULL                  },
    { 'm', "portmap",              "Enable portmapping via NAT-PMP or UPnP",
      "m",  0, NULL                  },
    { 'M', "no-portmap",           "Disable portmapping",
      "M",  0, NULL                  },
    { 'n', "auth",                 "Set authentication info",
      "n",  1, "<username:password>" },
    { 'p', "port",
      "Port for incoming peers (Default: " TR_DEFAULT_PORT_STR ")",
      "p", 1, "<port>" },
    { 900, "priority-high",        "Set the files' priorities as high",
      "ph", 1, "<files>"             },
    { 901, "priority-normal",      "Set the files' priorities as normal",
      "pn", 1, "<files>"             },
    { 902, "priority-low",         "Set the files' priorities as low",
      "pl", 1, "<files>"             },
    { 'r', "remove",               "Remove the current torrent(s)",
      "r",  0, NULL                  },
    { 's', "start",                "Start the current torrent(s)",
      "s",  0, NULL                  },
    { 'S', "stop",                 "Stop the current torrent(s)",
      "S",  0, NULL                  },
    { 't', "torrent",              "Set the current torrent(s)",
      "t",  1, "<torrent>"           },
    { 'u', "uplimit",              "Set the maximum upload speed in KB/s",
      "u",  1, "<speed>"             },
    { 'U', "no-uplimit",           "Don't limit the upload speed",
      "U",  0, NULL                  },
    { 'v', "verify",               "Verify the current torrent(s)",
      "v",  0, NULL                  },
    { 'w', "download-dir",         "Set the default download folder",
      "w",  1, "<path>"              },
    { 'x', "pex",                  "Enable peer exchange (PEX)",
      "x",  0, NULL                  },
    { 'X', "no-pex",               "Disable peer exchange (PEX)",
      "X",  0, NULL                  },
    { 'z', "peers",                "List the current torrent's peers",
      "z",  0, NULL                  },
    {   0, NULL,                   NULL,
        NULL, 0, NULL                  }
};

static void
showUsage( void )
{
    tr_getopt_usage( MY_NAME, getUsage( ), opts );
    exit( 0 );
}

static int
numarg( const char * arg )
{
    char *     end = NULL;
    const long num = strtol( arg, &end, 10 );

    if( *end )
    {
        fprintf( stderr, "Not a number: \"%s\"\n", arg );
        showUsage( );
    }
    return num;
}

static char * reqs[256]; /* arbitrary max */
static int    reqCount = 0;
static int    debug = 0;
static char * auth = NULL;

static char*
absolutify( char *       buf,
            size_t       len,
            const char * path )
{
    if( *path == '/' )
        tr_strlcpy( buf, path, len );
    else
    {
        char cwd[MAX_PATH_LENGTH];
        getcwd( cwd, sizeof( cwd ) );
        tr_buildPath( buf, len, cwd, path, NULL );
    }
    return buf;
}

static char*
getEncodedMetainfo( const char * filename )
{
    size_t    len = 0;
    char *    b64 = NULL;
    uint8_t * buf = tr_loadFile( filename, &len );

    if( buf )
    {
        b64 = tr_base64_encode( buf, len, NULL );
        tr_free( buf );
    }
    return b64;
}

static void
addIdArg( tr_benc *    args,
          const char * id )
{
    if( !*id )
    {
        fprintf(
            stderr,
            "No torrent specified!  Please use the -t option first.\n" );
        id = "-1"; /* no torrent will have this ID, so should be a no-op */
    }
    if( strcmp( id, "all" ) )
    {
        tr_rpc_parse_list_str( tr_bencDictAdd( args,
                                               "ids" ), id, strlen( id ) );
    }
}

static void
addFiles( tr_benc *    args,
          const char * key,
          const char * arg )
{
    tr_benc * files = tr_bencDictAddList( args, key, 100 );

    if( !*arg )
    {
        fprintf( stderr, "No files specified!\n" );
        arg = "-1"; /* no file will have this index, so should be a no-op */
    }
    if( strcmp( arg, "all" ) )
    {
        const char * walk = arg;
        while( *walk )
        {
            char *        p;
            unsigned long l;
            errno = 0;
            l = strtol( walk, &p, 10 );
            if( errno )
                break;
            tr_bencListAddInt( files, l - 1 );
            if( *p != ',' )
                break;
            walk = p + 1;
        }
    }
}

#define TR_N_ELEMENTS( ary ) ( sizeof( ary ) / sizeof( *ary ) )

static const char * files_keys[] = {
    "files", "name", "priorities", "wanted"
};

static const char * details_keys[] = {
    "activityDate",     "addedDate",              "announceResponse",
    "announceURL",
    "comment",        "corruptEver",        "creator",
    "dateCreated",     "doneDate",
    "downloadedEver", "errorString",        "eta",
    "hashString",      "haveUnchecked",
    "haveValid",      "id",                 "isPrivate",
    "lastAnnounceTime", "lastScrapeTime",
    "leechers",       "leftUntilDone",      "name",
    "nextAnnounceTime", "nextScrapeTime",
    "peersConnected", "peersGettingFromUs", "peersSendingToUs",
    "pieceCount",     "pieceSize",          "rateDownload",
    "rateUpload",      "recheckProgress",
    "scrapeResponse", "seeders",            "sizeWhenDone",
    "sizeWhenDone",    "startDate",
    "status",         "timesCompleted",     "totalSize",
    "uploadedEver",
    "webseeds",       "webseedsSendingToUs"
};

static const char * list_keys[] = {
    "downloadedEver", "eta",              "id",
    "leftUntilDone",
    "name",
    "rateDownload",
    "rateUpload",     "sizeWhenDone", "status", "uploadedEver"
};

static void
readargs( int           argc,
          const char ** argv )
{
    int          c;
    int          addingTorrents = 0;
    const char * optarg;
    char         id[4096];

    *id = '\0';

    while( ( c = tr_getopt( getUsage( ), argc, argv, opts, &optarg ) ) )
    {
        int     i, n;
        char    buf[MAX_PATH_LENGTH];
        int     addArg = TRUE;
        tr_benc top, *args, *fields;
        tr_bencInitDict( &top, 3 );
        args = tr_bencDictAddDict( &top, "arguments", 0 );

        switch( c )
        {
            case TR_OPT_UNK:
                if( addingTorrents )
                {
                    char * tmp = getEncodedMetainfo( optarg );
                    if( tmp )
                    {
                        tr_bencDictAddStr( &top, "method", "torrent-add" );
                        tr_bencDictAddStr( args, "metainfo", tmp );
                        tr_free( tmp );
                    }
                    else
                    {
                        fprintf( stderr, "Couldn't add file: %s\n", optarg );
                        addArg = FALSE;
                    }
                }
                else
                {
                    fprintf( stderr, "Unknown option: %s\n", optarg );
                    addArg = FALSE;
                }
                break;

            case 'a':
                addingTorrents = 1;
                addArg = FALSE;
                break;

            case 'b':
                debug = 1;
                addArg = FALSE;
                break;

            case 'd':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "speed-limit-down", numarg( optarg ) );
                tr_bencDictAddInt( args, "speed-limit-down-enabled", 1 );
                break;

            case 'D':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "speed-limit-down-enabled", 0 );
                break;

            case 'f':
                tr_bencDictAddStr( &top, "method", "torrent-get" );
                tr_bencDictAddInt( &top, "tag", TAG_FILES );
                addIdArg( args, id );
                n = TR_N_ELEMENTS( files_keys );
                fields = tr_bencDictAddList( args, "fields", n );
                for( i = 0; i < n; ++i )
                    tr_bencListAddStr( fields, files_keys[i] );
                break;

            case 'g':
                tr_bencDictAddStr( &top, "method", "torrent-set" );
                addIdArg( args, id );
                addFiles( args, "files-wanted", optarg );
                break;

            case 'G':
                tr_bencDictAddStr( &top, "method", "torrent-set" );
                addIdArg( args, id );
                addFiles( args, "files-unwanted", optarg );
                break;

            case 'i':
                tr_bencDictAddStr( &top, "method", "torrent-get" );
                tr_bencDictAddInt( &top, "tag", TAG_DETAILS );
                addIdArg( args, id );
                n = TR_N_ELEMENTS( details_keys );
                fields = tr_bencDictAddList( args, "fields", n );
                for( i = 0; i < n; ++i )
                    tr_bencListAddStr( fields, details_keys[i] );
                break;

            case 'l':
                tr_bencDictAddStr( &top, "method", "torrent-get" );
                tr_bencDictAddInt( &top, "tag", TAG_LIST );
                n = TR_N_ELEMENTS( list_keys );
                fields = tr_bencDictAddList( args, "fields", n );
                for( i = 0; i < n; ++i )
                    tr_bencListAddStr( fields, list_keys[i] );
                break;

            case 'm':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "port-forwarding-enabled", 1 );
                break;

            case 'M':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "port-forwarding-enabled", 0 );
                break;

            case 'n':
                auth = tr_strdup( optarg );
                addArg = FALSE;
                break;

            case 'p':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "port", numarg( optarg ) );
                break;

            case 'r':
                tr_bencDictAddStr( &top, "method", "torrent-remove" );
                addIdArg( args, id );
                break;

            case 's':
                tr_bencDictAddStr( &top, "method", "torrent-start" );
                addIdArg( args, id );
                break;

            case 'S':
                tr_bencDictAddStr( &top, "method", "torrent-stop" );
                addIdArg( args, id );
                break;

            case 't':
                tr_strlcpy( id, optarg, sizeof( id ) );
                addArg = FALSE;
                break;

            case 'u':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "speed-limit-up", numarg( optarg ) );
                tr_bencDictAddInt( args, "speed-limit-up-enabled", 1 );
                break;

            case 'U':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "speed-limit-up-enabled", 0 );
                break;

            case 'v':
                tr_bencDictAddStr( &top, "method", "torrent-verify" );
                addIdArg( args, id );
                break;

            case 'w':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddStr( args, "download-dir",
                                  absolutify( buf, sizeof( buf ), optarg ) );
                break;

            case 'x':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "pex-allowed", 1 );
                break;

            case 'X':
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddInt( args, "pex-allowed", 0 );
                break;

            case 'z':
                tr_bencDictAddStr( &top, "method", "torrent-get" );
                tr_bencDictAddInt( &top, "tag", TAG_PEERS );
                fields = tr_bencDictAddList( args, "fields", 1 );
                tr_bencListAddStr( fields, "peers" );
                break;

            case 900:
                tr_bencDictAddStr( &top, "method", "torrent-set" );
                addIdArg( args, id );
                addFiles( args, "priority-high", optarg );
                break;

            case 901:
                tr_bencDictAddStr( &top, "method", "torrent-set" );
                addIdArg( args, id );
                addFiles( args, "priority-normal", optarg );
                break;

            case 902:
                tr_bencDictAddStr( &top, "method", "torrent-set" );
                addIdArg( args, id );
                addFiles( args, "priority-low", optarg );
                break;

            case 910:
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddStr( args, "encryption", "required" );
                break;

            case 911:
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddStr( args, "encryption", "preferred" );
                break;

            case 912:
                tr_bencDictAddStr( &top, "method", "session-set" );
                tr_bencDictAddStr( args, "encryption", "tolerated" );
                break;

            case TR_OPT_ERR:
                fprintf( stderr, "invalid option\n" );
                showUsage( );
                break;

            default:
                fprintf( stderr, "got opt [%d]\n", (int)c );
                showUsage( );
                break;
        }

        if( addArg )
            reqs[reqCount++] = tr_bencSaveAsJSON( &top, NULL );
        tr_bencFree( &top );
    }
}

/* [host:port] or [host] or [port] */
static void
getHostAndPort( int *   argc,
                char ** argv,
                char ** host,
                int *   port )
{
    if( *argv[1] != '-' )
    {
        int          i;
        const char * s = argv[1];
        const char * delim = strchr( s, ':' );
        if( delim )   /* user passed in both host and port */
        {
            *host = tr_strndup( s, delim - s );
            *port = atoi( delim + 1 );
        }
        else
        {
            char *    end;
            const int i = strtol( s, &end, 10 );
            if( !*end ) /* user passed in a port */
                *port = i;
            else /* user passed in a host */
                *host = tr_strdup( s );
        }

        *argc -= 1;
        for( i = 1; i < *argc; ++i )
            argv[i] = argv[i + 1];
    }
}

static size_t
writeFunc( void * ptr,
           size_t size,
           size_t nmemb,
           void * buf )
{
    const size_t byteCount = size * nmemb;

    evbuffer_add( buf, ptr, byteCount );
    return byteCount;
}

static void
etaToString( char *  buf,
             size_t  buflen,
             int64_t eta )
{
    if( eta < 0 ) tr_snprintf( buf, buflen, "Unknown" );
    else if( eta < 60 ) tr_snprintf( buf, buflen, "%" PRId64 "sec", eta );
    else if( eta <
            ( 60 * 60 ) ) tr_snprintf( buf, buflen, "%" PRId64 " min",
                                       eta / 60 );
    else if( eta <
            ( 60 * 60 * 24 ) ) tr_snprintf( buf, buflen, "%" PRId64 " hrs",
                                           eta / ( 60 * 60 ) );
    else tr_snprintf( buf, buflen, "%" PRId64 " days", eta / ( 60 * 60 * 24 ) );
}

#define KILOBYTE_FACTOR 1024.0
#define MEGABYTE_FACTOR ( 1024.0 * 1024.0 )
#define GIGABYTE_FACTOR ( 1024.0 * 1024.0 * 1024.0 )

static char*
strlratio( char * buf,
           double numerator,
           double denominator,
           size_t buflen )
{
    if( denominator )
    {
        const double ratio = numerator / denominator;
        if( ratio < 10.0 )
            tr_snprintf( buf, buflen, "%'.2f", ratio );
        else if( ratio < 100.0 )
            tr_snprintf( buf, buflen, "%'.1f", ratio );
        else
            tr_snprintf( buf, buflen, "%'.0f", ratio );
    }
    else if( numerator )
        tr_strlcpy( buf, "Infinity", buflen );
    else
        tr_strlcpy( buf, "None", buflen );
    return buf;
}

static char*
strlsize( char *  buf,
          int64_t size,
          size_t  buflen )
{
    if( !size )
        tr_strlcpy( buf, "None", buflen );
    else if( size < (int64_t)KILOBYTE_FACTOR )
        tr_snprintf( buf, buflen, "%'" PRId64 " bytes", (int64_t)size );
    else
    {
        double displayed_size;
        if( size < (int64_t)MEGABYTE_FACTOR )
        {
            displayed_size = (double) size / KILOBYTE_FACTOR;
            tr_snprintf( buf, buflen, "%'.1f KB", displayed_size );
        }
        else if( size < (int64_t)GIGABYTE_FACTOR )
        {
            displayed_size = (double) size / MEGABYTE_FACTOR;
            tr_snprintf( buf, buflen, "%'.1f MB", displayed_size );
        }
        else
        {
            displayed_size = (double) size / GIGABYTE_FACTOR;
            tr_snprintf( buf, buflen, "%'.1f GB", displayed_size );
        }
    }
    return buf;
}

static const char*
torrentStatusToString( int i )
{
    switch( i )
    {
        case TR_STATUS_CHECK_WAIT:
            return "Will Verify";

        case TR_STATUS_CHECK:
            return "Verifying";

        case TR_STATUS_DOWNLOAD:
            return "Downloading";

        case TR_STATUS_SEED:
            return "Seeding";

        case TR_STATUS_STOPPED:
            return "Stopped";

        default:
            return "Error";
    }
}

static int
isVerifying( int status )
{
    return ( status == TR_STATUS_CHECK_WAIT )
           || ( status == TR_STATUS_CHECK );
}

static void
printDetails( tr_benc * top )
{
    tr_benc *args, *torrents;

    if( ( tr_bencDictFindDict( top, "arguments", &args ) )
      && ( tr_bencDictFindList( args, "torrents", &torrents ) ) )
    {
        int ti, tCount;
        for( ti = 0, tCount = tr_bencListSize( torrents ); ti < tCount;
             ++ti )
        {
            tr_benc *    t = tr_bencListChild( torrents, ti );
            tr_benc *    l;
            const char * str;
            char         buf[512];
            char         buf2[512];
            int64_t      i, j, k;

            printf( "NAME\n" );
            if( tr_bencDictFindInt( t, "id", &i ) )
                printf( "  Id: %" PRId64 "\n", i );
            if( tr_bencDictFindStr( t, "name", &str ) )
                printf( "  Name: %s\n", str );
            if( tr_bencDictFindStr( t, "hashString", &str ) )
                printf( "  Hash: %s\n", str );
            printf( "\n" );

            printf( "TRANSFER\n" );
            if( tr_bencDictFindInt( t, "status", &i ) )
            {
                if( isVerifying( i )
                  && tr_bencDictFindStr( t, "recheckProgress", &str ) )
                    tr_snprintf( buf, sizeof( buf ), " (%.0f%% Done)",
                                100.0 * atof(
                                    str ) );
                else
                    *buf = '\0';
                printf( "  State: %s%s\n", torrentStatusToString( i ), buf );
            }

            if( tr_bencDictFindInt( t, "sizeWhenDone", &i )
              && tr_bencDictFindInt( t, "leftUntilDone", &j ) )
            {
                strlratio( buf, 100.0 * ( i - j ), i, sizeof( buf ) );
                printf( "  Percent Done: %s%%\n", buf );
            }

            if( tr_bencDictFindInt( t, "eta", &i ) )
            {
                etaToString( buf, sizeof( buf ), i );
                printf( "  ETA: %s\n", buf );
            }
            if( tr_bencDictFindInt( t, "rateDownload", &i ) )
                printf( "  Download Speed: %.1f KB/s\n", i / 1024.0 );
            if( tr_bencDictFindInt( t, "rateUpload", &i ) )
                printf( "  Upload Speed: %.1f KB/s\n", i / 1024.0 );
            if( tr_bencDictFindInt( t, "haveUnchecked", &i )
              && tr_bencDictFindInt( t, "haveValid", &j ) )
            {
                strlsize( buf, i + j, sizeof( buf ) );
                strlsize( buf2, j, sizeof( buf2 ) );
                printf( "  Have: %s (%s verified)\n", buf, buf2 );
            }

            if( tr_bencDictFindInt( t, "sizeWhenDone", &i )
              && tr_bencDictFindInt( t, "totalSize", &j ) )
            {
                strlsize( buf, j, sizeof( buf ) );
                strlsize( buf2, i, sizeof( buf2 ) );
                printf( "  Total size: %s (%s wanted)\n", buf, buf2 );
            }
            if( tr_bencDictFindInt( t, "downloadedEver", &i )
              && tr_bencDictFindInt( t, "uploadedEver", &j ) )
            {
                strlsize( buf, i, sizeof( buf ) );
                printf( "  Downloaded: %s\n", buf );
                strlsize( buf, j, sizeof( buf ) );
                printf( "  Uploaded: %s\n", buf );
                strlratio( buf, j, i, sizeof( buf ) );
                printf( "  Ratio: %s\n", buf );
            }
            if( tr_bencDictFindInt( t, "corruptEver", &i ) )
            {
                strlsize( buf, i, sizeof( buf ) );
                printf( "  Corrupt DL: %s\n", buf );
            }
            if( tr_bencDictFindStr( t, "errorString", &str ) && str && *str )
                printf( "  Error: %s\n", str );

            if( tr_bencDictFindInt( t, "peersConnected", &i )
              && tr_bencDictFindInt( t, "peersGettingFromUs", &j )
              && tr_bencDictFindInt( t, "peersSendingToUs", &k ) )
            {
                printf(
                    "  Peers: "
                    "connected to %" PRId64 ", "
                                            "uploading to %" PRId64
                    ", "
                    "downloading from %"
                    PRId64 "\n",
                    i, j, k );
            }

            if( tr_bencDictFindList( t, "webseeds", &l )
              && tr_bencDictFindInt( t, "webseedsSendingToUs", &i ) )
            {
                const int64_t n = tr_bencListSize( l );
                if( n > 0 )
                    printf(
                        "  Web Seeds: downloading from %" PRId64 " of %"
                        PRId64
                        " web seeds\n", i, n );
            }
            printf( "\n" );

            printf( "HISTORY\n" );
            if( tr_bencDictFindInt( t, "addedDate", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Date added:      %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "doneDate", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Date finished:   %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "startDate", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Date started:    %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "activityDate", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Latest activity: %s", ctime( &tt ) );
            }
            printf( "\n" );

            printf( "TRACKER\n" );
            if( tr_bencDictFindInt( t, "lastAnnounceTime", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Latest announce: %s", ctime( &tt ) );
            }
            if( tr_bencDictFindStr( t, "announceURL", &str ) )
                printf( "  Announce URL: %s\n", str );
            if( tr_bencDictFindStr( t, "announceResponse",
                                    &str ) && str && *str )
                printf( "  Announce response: %s\n", str );
            if( tr_bencDictFindInt( t, "nextAnnounceTime", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Next announce:   %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "lastScrapeTime", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Latest scrape:   %s", ctime( &tt ) );
            }
            if( tr_bencDictFindStr( t, "scrapeResponse", &str ) )
                printf( "  Scrape response: %s\n", str );
            if( tr_bencDictFindInt( t, "nextScrapeTime", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Next scrape:     %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "seeders", &i )
              && tr_bencDictFindInt( t, "leechers", &j ) )
                printf(
                    "  Tracker knows of %" PRId64 " seeders and %" PRId64
                    " leechers\n", i, j );
            if( tr_bencDictFindInt( t, "timesCompleted", &i ) )
                printf(
                    "  Tracker has seen %" PRId64
                    " clients complete this torrent\n", i );
            printf( "\n" );

            printf( "ORIGINS\n" );
            if( tr_bencDictFindInt( t, "dateCreated", &i ) && i )
            {
                const time_t tt = i;
                printf( "  Date created: %s", ctime( &tt ) );
            }
            if( tr_bencDictFindInt( t, "isPrivate", &i ) )
                printf( "  Public torrent: %s\n", ( i ? "No" : "Yes" ) );
            if( tr_bencDictFindStr( t, "comment", &str ) && str && *str )
                printf( "  Comment: %s\n", str );
            if( tr_bencDictFindStr( t, "creator", &str ) && str && *str )
                printf( "  Creator: %s\n", str );
            if( tr_bencDictFindInt( t, "pieceCount", &i ) )
                printf( "  Piece Count: %" PRId64 "\n", i );
            if( tr_bencDictFindInt( t, "pieceSize", &i ) )
                printf( "  Piece Size: %" PRId64 "\n", i );
        }
    }
}

static void
printFileList( tr_benc * top )
{
    tr_benc *args, *torrents;

    if( ( tr_bencDictFindDict( top, "arguments", &args ) )
      && ( tr_bencDictFindList( args, "torrents", &torrents ) ) )
    {
        int i, in;
        for( i = 0, in = tr_bencListSize( torrents ); i < in; ++i )
        {
            tr_benc *    d = tr_bencListChild( torrents, i );
            tr_benc *    files, *priorities, *wanteds;
            const char * name;
            if( tr_bencDictFindStr( d, "name", &name )
              && tr_bencDictFindList( d, "files", &files )
              && tr_bencDictFindList( d, "priorities", &priorities )
              && tr_bencDictFindList( d, "wanted", &wanteds ) )
            {
                int j = 0, jn = tr_bencListSize( files );
                printf( "%s (%d files):\n", name, jn );
                printf( "%3s  %4s %8s %3s %9s  %s\n", "#", "Done",
                        "Priority", "Get", "Size",
                        "Name" );
                for( j = 0, jn = tr_bencListSize( files ); j < jn; ++j )
                {
                    int64_t      have;
                    int64_t      length;
                    int64_t      priority;
                    int64_t      wanted;
                    const char * filename;
                    tr_benc *    file = tr_bencListChild( files, j );
                    if( tr_bencDictFindInt( file, "length", &length )
                      && tr_bencDictFindStr( file, "name", &filename )
                      && tr_bencDictFindInt( file, "bytesCompleted", &have )
                      && tr_bencGetInt( tr_bencListChild( priorities,
                                                          j ), &priority )
                      && tr_bencGetInt( tr_bencListChild( wanteds,
                                                          j ), &wanted ) )
                    {
                        char         sizestr[64];
                        double       percent = (double)have / length;
                        const char * pristr;
                        strlsize( sizestr, length, sizeof( sizestr ) );
                        switch( priority )
                        {
                            case TR_PRI_LOW:
                                pristr = "Low"; break;

                            case TR_PRI_HIGH:
                                pristr = "High"; break;

                            default:
                                pristr = "Normal"; break;
                        }
                        printf( "%3d: %3.0f%% %-8s %-3s %9s  %s\n",
                                ( j + 1 ),
                                ( 100.0 * percent ),
                                pristr,
                                ( wanted ? "Yes" : "No" ),
                                sizestr,
                                filename );
                    }
                }
            }
        }
    }
}

static void
printPeerList( tr_benc * top )
{
    tr_benc *args, *list;

    if( ( tr_bencDictFindDict( top, "arguments", &args ) )
      && ( tr_bencDictFindList( args, "peers", &list ) ) )
    {
        int i, n;
        printf( "%-20s  %-12s  %-5s  %5s  %s\n",
                "Address", "Flags", "Down", "Up", "Client" );
        for( i = 0, n = tr_bencListSize( list ); i < n; ++i )
        {
            const char * address, * client, * flagstr;
            int64_t      rateToClient, rateToPeer;
            tr_benc *    d = tr_bencListChild( list, i );
            if( tr_bencDictFindStr( d, "address", &address )
              && tr_bencDictFindStr( d, "client", &client )
              && tr_bencDictFindStr( d, "flagstr", &flagstr )
              && tr_bencDictFindInt( d, "rateToClient", &rateToClient )
              && tr_bencDictFindInt( d, "rateToPeer", &rateToPeer ) )
            {
                printf( "%-20s  %-12s  %5.1f  %5.1f  %s\n",
                        address, flagstr,
                        rateToClient * 1024.0,
                        rateToPeer * 1024.0,
                        client );
            }
        }
    }
}

static void
printTorrentList( tr_benc * top )
{
    tr_benc *args, *list;

    if( ( tr_bencDictFindDict( top, "arguments", &args ) )
      && ( tr_bencDictFindList( args, "torrents", &list ) ) )
    {
        int i, n;
        printf( "%-3s  %-4s  %-8s  %-6s  %-6s  %-5s  %-11s  %s\n",
                "ID", "Done", "ETA", "Up", "Down", "Ratio", "Status",
                "Name" );
        for( i = 0, n = tr_bencListSize( list ); i < n; ++i )
        {
            int64_t     id, eta, status, up, down;
            int64_t     sizeWhenDone, leftUntilDone;
            int64_t     upEver, downEver;
            const char *name;
            tr_benc *   d = tr_bencListChild( list, i );
            if( tr_bencDictFindInt( d, "downloadedEver", &downEver )
              && tr_bencDictFindInt( d, "eta", &eta )
              && tr_bencDictFindInt( d, "id", &id )
              && tr_bencDictFindInt( d, "leftUntilDone", &leftUntilDone )
              && tr_bencDictFindStr( d, "name", &name )
              && tr_bencDictFindInt( d, "rateDownload", &down )
              && tr_bencDictFindInt( d, "rateUpload", &up )
              && tr_bencDictFindInt( d, "sizeWhenDone", &sizeWhenDone )
              && tr_bencDictFindInt( d, "status", &status )
              && tr_bencDictFindInt( d, "uploadedEver", &upEver ) )
            {
                char etaStr[16];
                if( leftUntilDone )
                    etaToString( etaStr, sizeof( etaStr ), eta );
                else
                    tr_snprintf( etaStr, sizeof( etaStr ), "Done" );
                printf(
                    "%3d  %3d%%  %-8s  %6.1f  %6.1f  %5.1f  %-11s  %s\n",
                    (int)id,
                    (int)( 100.0 *
                           ( sizeWhenDone - leftUntilDone ) / sizeWhenDone ),
                    etaStr,
                    up / 1024.0,
                    down / 1024.0,
                    (double)( downEver ? ( (double)upEver /
                                          downEver ) : 0.0 ),
                    torrentStatusToString( status ),
                    name );
            }
        }
    }
}

static void
processResponse( const char * host,
                 int          port,
                 const void * response,
                 size_t       len )
{
    tr_benc top;

    if( debug )
        fprintf( stderr, "got response: [%*.*s]\n",
                 (int)len, (int)len, (const char*) response );

    if( tr_jsonParse( response, len, &top, NULL ) )
        tr_nerr( MY_NAME, "Unable to parse response \"%*.*s\"", (int)len,
                 (int)len, (char*)response );
    else
    {
        int64_t      tag = -1;
        const char * str;
        tr_bencDictFindInt( &top, "tag", &tag );

        switch( tag )
        {
            case TAG_FILES:
                printFileList( &top ); break;

            case TAG_DETAILS:
                printDetails( &top ); break;

            case TAG_LIST:
                printTorrentList( &top ); break;

            case TAG_PEERS:
                printPeerList( &top ); break;

            default:
                if( tr_bencDictFindStr( &top, "result", &str ) )
                    printf( "%s:%d responded: \"%s\"\n", host, port, str );
        }

        tr_bencFree( &top );
    }
}

static void
processRequests( const char *  host,
                 int           port,
                 const char ** reqs,
                 int           reqCount )
{
    int               i;
    CURL *            curl;
    struct evbuffer * buf = evbuffer_new( );
    char *            url = tr_strdup_printf(
        "http://%s:%d/transmission/rpc", host, port );

    curl = curl_easy_init( );
    curl_easy_setopt( curl, CURLOPT_VERBOSE, debug );
#ifdef HAVE_LIBZ
    curl_easy_setopt( curl, CURLOPT_ENCODING, "deflate" );
#endif
    curl_easy_setopt( curl, CURLOPT_USERAGENT,
                      MY_NAME "/" LONG_VERSION_STRING );
    curl_easy_setopt( curl, CURLOPT_WRITEFUNCTION, writeFunc );
    curl_easy_setopt( curl, CURLOPT_WRITEDATA, buf );
    curl_easy_setopt( curl, CURLOPT_POST, 1 );
    curl_easy_setopt( curl, CURLOPT_URL, url );
    if( auth )
    {
        curl_easy_setopt( curl, CURLOPT_USERPWD, auth );
        curl_easy_setopt( curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY );
    }

    for( i = 0; i < reqCount; ++i )
    {
        CURLcode res;
        curl_easy_setopt( curl, CURLOPT_POSTFIELDS, reqs[i] );
        if( debug )
            tr_ninf( MY_NAME, "posting [%s]\n", reqs[i] );
        if( ( res = curl_easy_perform( curl ) ) )
            tr_nerr( MY_NAME, "(%s:%d) %s", host, port,
                    curl_easy_strerror( res ) );
        else
            processResponse( host, port, EVBUFFER_DATA(
                                buf ), EVBUFFER_LENGTH( buf ) );

        evbuffer_drain( buf, EVBUFFER_LENGTH( buf ) );
    }

    /* cleanup */
    tr_free( url );
    evbuffer_free( buf );
    curl_easy_cleanup( curl );
}

int
main( int     argc,
      char ** argv )
{
    int    i;
    int    port = DEFAULT_PORT;
    char * host = NULL;

    if( argc < 2 )
        showUsage( );

    getHostAndPort( &argc, argv, &host, &port );
    if( host == NULL )
        host = tr_strdup( DEFAULT_HOST );

    readargs( argc, (const char**)argv );
    if( reqCount )
        processRequests( host, port, (const char**)reqs, reqCount );
    else
        showUsage( );

    for( i = 0; i < reqCount; ++i )
        tr_free( reqs[i] );

    tr_free( host );
    return 0;
}