premiere-libtorrent/examples/client_test.cpp

/*

Copyright (c) 2003, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

*/

#include <iterator>

#include "libtorrent/config.hpp"

#ifdef _MSC_VER
#pragma warning(push, 1)
#endif

#include <boost/bind.hpp>
#include <boost/unordered_set.hpp>

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#include "libtorrent/extensions/metadata_transfer.hpp"
#include "libtorrent/extensions/ut_metadata.hpp"
#include "libtorrent/extensions/ut_pex.hpp"
#include "libtorrent/extensions/smart_ban.hpp"

#include "libtorrent/entry.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/identify_client.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/ip_filter.hpp"
#include "libtorrent/magnet_uri.hpp"
#include "libtorrent/bitfield.hpp"
#include "libtorrent/file.hpp"
#include "libtorrent/peer_info.hpp"
#include "libtorrent/socket_io.hpp" // print_address
#include "libtorrent/time.hpp"
#include "libtorrent/create_torrent.hpp"

using boost::bind;

#ifdef _WIN32

#if defined(_MSC_VER)
#	define for if (false) {} else for
#endif

#include <windows.h>
#include <conio.h>

bool sleep_and_input(int* c, int sleep)
{
	for (int i = 0; i < 2; ++i)
	{
		if (_kbhit())
		{
			*c = _getch();
			return true;
		}
		Sleep(sleep / 2);
	}
	return false;
};

void clear_home()
{
	CONSOLE_SCREEN_BUFFER_INFO si;
	HANDLE h = GetStdHandle(STD_OUTPUT_HANDLE);
	GetConsoleScreenBufferInfo(h, &si);
	COORD c = {0, 0};
	DWORD n;
	FillConsoleOutputCharacter(h, ' ', si.dwSize.X * si.dwSize.Y, c, &n);
	SetConsoleCursorPosition(h, c);
}

#else

#include <stdlib.h>
#include <stdio.h>

#include <termios.h>
#include <string.h>
#include <sys/ioctl.h>

#define ANSI_TERMINAL_COLORS

struct set_keypress
{
	set_keypress()
	{
		termios new_settings;
		tcgetattr(0,&stored_settings);
		new_settings = stored_settings;
		// Disable canonical mode, and set buffer size to 1 byte
		new_settings.c_lflag &= (~ICANON);
		new_settings.c_cc[VTIME] = 0;
		new_settings.c_cc[VMIN] = 1;
		tcsetattr(0,TCSANOW,&new_settings);
	}
	~set_keypress() { tcsetattr(0,TCSANOW,&stored_settings); }
	termios stored_settings;
};

bool sleep_and_input(int* c, int sleep)
{
	// sets the terminal to single-character mode
	// and resets when destructed
	set_keypress s;
	libtorrent::ptime start = libtorrent::time_now_hires();
	int ret = 0;
retry:
	fd_set set;
	FD_ZERO(&set);
	FD_SET(0, &set);
	timeval tv = {sleep/ 1000, (sleep % 1000) * 1000 };
	ret = select(1, &set, 0, 0, &tv);
	if (ret > 0)
	{
		*c = getc(stdin);
		return true;
	}
	if (errno == EINTR)
	{
		if (total_milliseconds(libtorrent::time_now_hires() - start) < sleep)
			goto retry;
		return false;
	}

	if (ret < 0 && errno != 0 && errno != ETIMEDOUT)
	{
		fprintf(stderr, "select failed: %s\n", strerror(errno));
		libtorrent::sleep(500);
	}

	return false;
}

void clear_home()
{
	puts("\033[2J\033[0;0H");
}

#endif

bool print_trackers = false;
bool print_peers = false;
bool print_log = false;
bool print_downloads = false;
bool print_piece_bar = false;
bool print_file_progress = false;
bool show_pad_files = false;
bool show_dht_status = false;
bool sequential_download = false;
bool print_utp_stats = false;

bool print_ip = true;
bool print_as = false;
bool print_timers = false;
bool print_block = false;
bool print_peer_rate = false;
bool print_fails = false;
bool print_send_bufs = true;

// the number of times we've asked to save resume data
// without having received a response (successful or failure)
int num_outstanding_resume_data = 0;

int load_file(std::string const& filename, std::vector<char>& v, libtorrent::error_code& ec, int limit = 8000000)
{
	ec.clear();
	FILE* f = fopen(filename.c_str(), "rb");
	if (f == NULL)
	{
		ec.assign(errno, boost::system::get_generic_category());
		return -1;
	}

	int r = fseek(f, 0, SEEK_END);
	if (r != 0)
	{
		ec.assign(errno, boost::system::get_generic_category());
		fclose(f);
		return -1;
	}
	long s = ftell(f);
	if (s < 0)
	{
		ec.assign(errno, boost::system::get_generic_category());
		fclose(f);
		return -1;
	}

	if (s > limit)
	{
		fclose(f);
		return -2;
	}

	r = fseek(f, 0, SEEK_SET);
	if (r != 0)
	{
		ec.assign(errno, boost::system::get_generic_category());
		fclose(f);
		return -1;
	}

	v.resize(s);
	if (s == 0)
	{
		fclose(f);
		return 0;
	}

	r = fread(&v[0], 1, v.size(), f);
	if (r < 0)
	{
		ec.assign(errno, boost::system::get_generic_category());
		fclose(f);
		return -1;
	}

	fclose(f);

	if (r != s) return -3;

	return 0;
}

bool is_hex(char const *in, int len)
{
	for (char const* end = in + len; in < end; ++in)
	{
		if (*in >= '0' && *in <= '9') continue;
		if (*in >= 'A' && *in <= 'F') continue;
		if (*in >= 'a' && *in <= 'f') continue;
		return false;
	}
	return true;
}

enum {
	torrents_all,
	torrents_downloading,
	torrents_not_paused,
	torrents_seeding,
	torrents_queued,
	torrents_stopped,
	torrents_checking,
	torrents_feeds,

	torrents_max
};

int torrent_filter = torrents_not_paused;

struct torrent_entry
{
	torrent_entry(libtorrent::torrent_handle h) : handle(h) {}
	libtorrent::torrent_handle handle;
	libtorrent::torrent_status status;
};

// maps filenames to torrent_handles
typedef std::multimap<std::string, libtorrent::torrent_handle> handles_t;

using libtorrent::torrent_status;

bool show_torrent(libtorrent::torrent_status const& st, int torrent_filter, int* counters)
{
	++counters[torrents_all];
	
	if (!st.paused
		&& st.state != torrent_status::seeding
		&& st.state != torrent_status::finished)
	{
		++counters[torrents_downloading];
	}

	if (!st.paused) ++counters[torrents_not_paused];

	if (!st.paused
		&& (st.state == torrent_status::seeding
		|| st.state == torrent_status::finished))
	{
		++counters[torrents_seeding];
	}

	if (st.paused && st.auto_managed)
	{
		++counters[torrents_queued];
	}

	if (st.paused && !st.auto_managed)
	{
		++counters[torrents_stopped];
	}

	if (st.state == torrent_status::checking_files
		|| st.state == torrent_status::queued_for_checking)
	{
		++counters[torrents_checking];
	}

	switch (torrent_filter)
	{
		case torrents_all: return true;
		case torrents_downloading:
			return !st.paused
			&& st.state != torrent_status::seeding
			&& st.state != torrent_status::finished;
		case torrents_not_paused: return !st.paused;
		case torrents_seeding:
			return !st.paused
			&& (st.state == torrent_status::seeding
			|| st.state == torrent_status::finished);
		case torrents_queued: return st.paused && st.auto_managed;
		case torrents_stopped: return st.paused && !st.auto_managed;
		case torrents_checking: return st.state == torrent_status::checking_files
			|| st.state == torrent_status::queued_for_checking;
		case torrents_feeds: return false;
	}
	return true;
}

bool yes(libtorrent::torrent_status const&)
{ return true; }

FILE* g_log_file = 0;

int active_torrent = 0;

bool compare_torrent(torrent_status const* lhs, torrent_status const* rhs)
{
	if (lhs->queue_position != -1 && rhs->queue_position != -1)
	{
		// both are downloading, sort by queue pos
		return lhs->queue_position < rhs->queue_position;
	}
	else if (lhs->queue_position == -1 && rhs->queue_position == -1)
	{
		// both are seeding, sort by seed-rank
		if (lhs->seed_rank != rhs->seed_rank)
			return lhs->seed_rank > rhs->seed_rank;

		return lhs->info_hash < rhs->info_hash;
	}

	return (lhs->queue_position == -1) < (rhs->queue_position == -1);
}

void update_filtered_torrents(boost::unordered_set<torrent_status>& all_handles
	, std::vector<torrent_status const*>& filtered_handles, int* counters)
{
	filtered_handles.clear();
	memset(counters, 0, sizeof(int) * torrents_max);
	for (boost::unordered_set<torrent_status>::iterator i = all_handles.begin()
		, end(all_handles.end()); i != end; ++i)
	{
		if (!show_torrent(*i, torrent_filter, counters)) continue;
		filtered_handles.push_back(&*i);
	}
	if (active_torrent >= int(filtered_handles.size())) active_torrent = filtered_handles.size() - 1;
	else if (active_torrent == -1 && !filtered_handles.empty()) active_torrent = 0;
	std::sort(filtered_handles.begin(), filtered_handles.end(), &compare_torrent);
}

char const* esc(char const* code)
{
#ifdef ANSI_TERMINAL_COLORS
	// this is a silly optimization
	// to avoid copying of strings
	enum { num_strings = 200 };
	static char buf[num_strings][20];
	static int round_robin = 0;
	char* ret = buf[round_robin];
	++round_robin;
	if (round_robin >= num_strings) round_robin = 0;
	ret[0] = '\033';
	ret[1] = '[';
	int i = 2;
	int j = 0;
	while (code[j]) ret[i++] = code[j++];
	ret[i++] = 'm';
	ret[i++] = 0;
	return ret;
#else
	return "";
#endif
}

std::string to_string(int v, int width)
{
	char buf[100];
	snprintf(buf, sizeof(buf), "%*d", width, v);
	return buf;
}

std::string& to_string(float v, int width, int precision = 3)
{
	// this is a silly optimization
	// to avoid copying of strings
	enum { num_strings = 20 };
	static std::string buf[num_strings];
	static int round_robin = 0;
	std::string& ret = buf[round_robin];
	++round_robin;
	if (round_robin >= num_strings) round_robin = 0;
	ret.resize(20);
	int size = snprintf(&ret[0], 20, "%*.*f", width, precision, v);
	ret.resize((std::min)(size, width));
	return ret;
}

std::string add_suffix(float val, char const* suffix = 0)
{
	std::string ret;
	if (val == 0)
	{
		ret.resize(4 + 2, ' ');
		if (suffix) ret.resize(4 + 2 + strlen(suffix), ' ');
		return ret;
	}

	const char* prefix[] = {"kB", "MB", "GB", "TB"};
	const int num_prefix = sizeof(prefix) / sizeof(const char*);
	for (int i = 0; i < num_prefix; ++i)
	{
		val /= 1000.f;
		if (std::fabs(val) < 1000.f)
		{
			ret = to_string(val, 4);
			ret += prefix[i];
			if (suffix) ret += suffix;
			return ret;
		}
	}
	ret = to_string(val, 4);
	ret += "PB";
	if (suffix) ret += suffix;
	return ret;
}

std::string const& piece_bar(libtorrent::bitfield const& p, int width)
{
#ifdef ANSI_TERMINAL_COLORS
	static const char* lookup[] =
	{
		// black, blue, cyan, white
		"40", "44", "46", "47"
	};

	const int table_size = sizeof(lookup) / sizeof(lookup[0]);
#else
	static const char char_lookup[] =
	{ ' ', '.', ':', '-', '+', '*', '#'};

	const int table_size = sizeof(char_lookup) / sizeof(char_lookup[0]);
#endif
	
	double piece_per_char = p.size() / double(width);
	static std::string bar;
	bar.clear();
	bar.reserve(width * 6);
	bar += "[";
	if (p.size() == 0)
	{
		for (int i = 0; i < width; ++i) bar += ' ';
		bar += "]";
		return bar;
	}

	// the [piece, piece + pieces_per_char) range is the pieces that are represented by each character
	double piece = 0;
	for (int i = 0; i < width; ++i, piece += piece_per_char)
	{
		int num_pieces = 0;
		int num_have = 0;
		int end = (std::max)(int(piece + piece_per_char), int(piece) + 1);
		for (int k = int(piece); k < end; ++k, ++num_pieces)
			if (p[k]) ++num_have;
		int color = int(std::ceil(num_have / float(num_pieces) * (table_size - 1)));
#ifdef ANSI_TERMINAL_COLORS
		bar += esc(lookup[color]);
		bar += " ";
#else
		bar += char_lookup[color];
#endif
	}
#ifdef ANSI_TERMINAL_COLORS
	bar += esc("0");
#endif
	bar += "]";
	return bar;
}

std::string const& progress_bar(int progress, int width, char const* code = "33")
{
	static std::string bar;
	bar.clear();
	bar.reserve(width + 10);

	int progress_chars = (progress * width + 500) / 1000;
	bar = esc(code);
	std::fill_n(std::back_inserter(bar), progress_chars, '#');
	std::fill_n(std::back_inserter(bar), width - progress_chars, '-');
	bar += esc("0");
	return bar;
}

int peer_index(libtorrent::tcp::endpoint addr, std::vector<libtorrent::peer_info> const& peers)
{
	using namespace libtorrent;
	std::vector<peer_info>::const_iterator i = std::find_if(peers.begin()
		, peers.end(), boost::bind(&peer_info::ip, _1) == addr);
	if (i == peers.end()) return -1;

	return i - peers.begin();
}

void print_peer_info(std::string& out, std::vector<libtorrent::peer_info> const& peers)
{
	using namespace libtorrent;
	if (print_ip) out += "IP                                                   ";
#ifndef TORRENT_DISABLE_GEO_IP
	if (print_as) out += "AS                                         ";
#endif
	out += "down     (total | peak   )  up      (total | peak   ) sent-req tmo bsy rcv flags            source  ";
	if (print_fails) out += "fail hshf ";
	if (print_send_bufs) out += "rq sndb            quota rcvb            q-bytes ";
	if (print_timers) out += "inactive wait timeout q-time ";
	out += "disk   rtt ";
	if (print_block) out += "block-progress ";
#ifndef TORRENT_DISABLE_RESOLVE_COUNTRIES
	out += "country ";
#endif
	if (print_peer_rate) out += "peer-rate est.rec.rate ";
	out += "client \n";

	char str[500];
	for (std::vector<peer_info>::const_iterator i = peers.begin();
		i != peers.end(); ++i)
	{
		if (i->flags & (peer_info::handshake | peer_info::connecting | peer_info::queued))
			continue;

		if (print_ip)
		{
			snprintf(str, sizeof(str), "%-30s %-22s", (print_endpoint(i->ip) +
				(i->connection_type == peer_info::bittorrent_utp ? " [uTP]" : "")).c_str()
				, print_endpoint(i->local_endpoint).c_str());
			out += str;
		}

#ifndef TORRENT_DISABLE_GEO_IP
		if (print_as)
		{
			error_code ec;
			snprintf(str, sizeof(str), "%-42s ", i->inet_as_name.c_str());
			out += str;
		}
#endif

		char temp[10];
		snprintf(temp, sizeof(temp), "%d/%d"
			, i->download_queue_length
			, i->target_dl_queue_length);
		temp[7] = 0;

		snprintf(str, sizeof(str)
			, "%s%s (%s|%s) %s%s (%s|%s) %s%7s %4d%4d%4d %c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c %c%c%c%c%c%c "
			, esc("32"), add_suffix(i->down_speed, "/s").c_str()
			, add_suffix(i->total_download).c_str(), add_suffix(i->download_rate_peak, "/s").c_str()
			, esc("31"), add_suffix(i->up_speed, "/s").c_str(), add_suffix(i->total_upload).c_str()
			, add_suffix(i->upload_rate_peak, "/s").c_str(), esc("0")

			, temp // sent requests and target number of outstanding reqs.
			, i->timed_out_requests
			, i->busy_requests
			, i->upload_queue_length

			, (i->flags & peer_info::interesting)?'I':'.'
			, (i->flags & peer_info::choked)?'C':'.'
			, (i->flags & peer_info::remote_interested)?'i':'.'
			, (i->flags & peer_info::remote_choked)?'c':'.'
			, (i->flags & peer_info::supports_extensions)?'e':'.'
			, (i->flags & peer_info::local_connection)?'l':'r'
			, (i->flags & peer_info::seed)?'s':'.'
			, (i->flags & peer_info::on_parole)?'p':'.'
			, (i->flags & peer_info::optimistic_unchoke)?'O':'.'
			, (i->read_state == peer_info::bw_limit)?'r':
				(i->read_state == peer_info::bw_network)?'R':
				(i->read_state == peer_info::bw_disk)?'D':'.'
			, (i->write_state == peer_info::bw_limit)?'w':
				(i->write_state == peer_info::bw_network)?'W':
				(i->write_state == peer_info::bw_disk)?'D':'.'
			, (i->flags & peer_info::snubbed)?'S':'.'
			, (i->flags & peer_info::upload_only)?'U':'D'
			, (i->flags & peer_info::endgame_mode)?'-':'.'
#ifndef TORRENT_DISABLE_ENCRYPTION
			, (i->flags & peer_info::rc4_encrypted)?'E':
				(i->flags & peer_info::plaintext_encrypted)?'e':'.'
#else
			, '.'
#endif
			, (i->flags & peer_info::holepunched)?'h':'.'

			, (i->source & peer_info::tracker)?'T':'_'
			, (i->source & peer_info::pex)?'P':'_'
			, (i->source & peer_info::dht)?'D':'_'
			, (i->source & peer_info::lsd)?'L':'_'
			, (i->source & peer_info::resume_data)?'R':'_'
			, (i->source & peer_info::incoming)?'I':'_');
		out += str;

		if (print_fails)
		{
			snprintf(str, sizeof(str), "%3d %3d "
				, i->failcount, i->num_hashfails);
			out += str;
		}
		if (print_send_bufs)
		{
			snprintf(str, sizeof(str), "%2d %6d (%s) %5d %6d (%s) %6d "
				, i->requests_in_buffer, i->used_send_buffer, add_suffix(i->send_buffer_size).c_str()
				, i->send_quota, i->used_receive_buffer, add_suffix(i->receive_buffer_size).c_str()
				, i->queue_bytes);
			out += str;
		}
		if (print_timers)
		{
			snprintf(str, sizeof(str), "%8d %4d %7d %6d "
				, total_seconds(i->last_active)
				, total_seconds(i->last_request)
				, i->request_timeout
				, total_seconds(i->download_queue_time));
			out += str;
		}
		snprintf(str, sizeof(str), "%s %4d "
			, add_suffix(i->pending_disk_bytes).c_str()
			, i->rtt);
		out += str;

		if (print_block)
		{
			if (i->downloading_piece_index >= 0)
			{
				out += progress_bar(
					i->downloading_progress * 1000 / i->downloading_total, 14);
			}
			else
			{
				out += progress_bar(0, 14);
			}
		}

#ifndef TORRENT_DISABLE_RESOLVE_COUNTRIES
		if (i->country[0] == 0)
		{
			out += " ..";
		}
		else
		{
			snprintf(str, sizeof(str), " %c%c", i->country[0], i->country[1]);
			out += str;
		}
#endif
		if (print_peer_rate)
		{
			bool unchoked = (i->flags & peer_info::choked) == 0;

			snprintf(str, sizeof(str), " %s %s"
				, add_suffix(i->remote_dl_rate, "/s").c_str()
				, unchoked ? add_suffix(i->estimated_reciprocation_rate, "/s").c_str() : "      ");
			out += str;
		}
		out += " ";

		if (i->flags & peer_info::handshake)
		{
			out += esc("31");
			out += " waiting for handshake";
			out += esc("0");
			out += "\n";
		}
		else if (i->flags & peer_info::connecting)
		{
			out += esc("31");
			out += " connecting to peer";
			out += esc("0");
			out += "\n";
		}
		else if (i->flags & peer_info::queued)
		{
			out += esc("33");
			out += " queued";
			out += esc("0");
			out += "\n";
		}
		else
		{
			out += " ";
			out += i->client;
			out += "\n";
		}
	}
}

int listen_port = 6881;
int allocation_mode = libtorrent::storage_mode_sparse;
std::string save_path(".");
int torrent_upload_limit = 0;
int torrent_download_limit = 0;
std::string monitor_dir;
std::string bind_to_interface = "";
std::string outgoing_interface = "";
int poll_interval = 5;
int max_connections_per_torrent = 50;
bool seed_mode = false;

bool share_mode = false;
bool disable_storage = false;

// if non-empty, a peer that will be added to all torrents
std::string peer;

using boost::bind;

// monitored_dir is true if this torrent is added because
// it was found in the directory that is monitored. If it
// is, it should be remembered so that it can be removed
// if it's no longer in that directory.
void add_torrent(libtorrent::session& ses
	, handles_t& files
	, std::set<libtorrent::torrent_handle>& non_files
	, std::string const& torrent
	, int allocation_mode
	, std::string const& save_path
	, bool monitored_dir
	, int torrent_upload_limit
	, int torrent_download_limit)
{
	using namespace libtorrent;

	boost::intrusive_ptr<torrent_info> t;
	error_code ec;
	t = new torrent_info(torrent.c_str(), ec);
	if (ec)
	{
		fprintf(stderr, "%s: %s\n", torrent.c_str(), ec.message().c_str());
		return;
	}

	printf("%s\n", t->name().c_str());

	add_torrent_params p;
	if (seed_mode) p.flags |= add_torrent_params::flag_seed_mode;
	if (disable_storage) p.storage = disabled_storage_constructor;
	if (share_mode) p.flags |= add_torrent_params::flag_share_mode;
	lazy_entry resume_data;

	std::string filename = combine_path(save_path, combine_path(".resume", to_hex(t->info_hash().to_string()) + ".resume"));

	load_file(filename.c_str(), p.resume_data, ec);

	p.ti = t;
	p.save_path = save_path;
	p.storage_mode = (storage_mode_t)allocation_mode;
	p.flags |= add_torrent_params::flag_paused;
	p.flags &= ~add_torrent_params::flag_duplicate_is_error;
	p.flags |= add_torrent_params::flag_auto_managed;
	p.userdata = (void*)strdup(torrent.c_str());
	ses.async_add_torrent(p);
}

void scan_dir(std::string const& dir_path
	, libtorrent::session& ses
	, handles_t& files 
	, std::set<libtorrent::torrent_handle>& non_files
	, int allocation_mode
	, std::string const& save_path
	, int torrent_upload_limit
	, int torrent_download_limit)
{
	std::set<std::string> valid;

	using namespace libtorrent;

	error_code ec;
	for (directory i(dir_path, ec); !i.done(); i.next(ec))
	{
		std::string file = combine_path(dir_path, i.file());
		if (extension(file) != ".torrent") continue;

		handles_t::iterator k = files.find(file);
		if (k != files.end())
		{
			valid.insert(file);
			continue;
		}

		// the file has been added to the dir, start
		// downloading it.
		add_torrent(ses, files, non_files, file, allocation_mode
			, save_path, true, torrent_upload_limit, torrent_download_limit);
		valid.insert(file);
	}

	// remove the torrents that are no longer in the directory

	for (handles_t::iterator i = files.begin(); !files.empty() && i != files.end();)
	{
		if (i->first.empty() || valid.find(i->first) != valid.end())
		{
			++i;
			continue;
		}

		torrent_handle& h = i->second;
		if (!h.is_valid())
		{
			files.erase(i++);
			continue;
		}
		
		h.auto_managed(false);
		h.pause();
		// the alert handler for save_resume_data_alert
		// will save it to disk
		if (h.need_save_resume_data())
		{
			h.save_resume_data();
			++num_outstanding_resume_data;
		}

		files.erase(i++);
	}
}

torrent_status const& get_active_torrent(std::vector<torrent_status const*> const& filtered_handles)
{
	if (active_torrent >= int(filtered_handles.size())
		|| active_torrent < 0) active_torrent = 0;
	return *filtered_handles[active_torrent];
}

void print_alert(libtorrent::alert const* a, std::string& str)
{
	using namespace libtorrent;

#ifdef ANSI_TERMINAL_COLORS
	if (a->category() & alert::error_notification)
	{
		str += esc("31");
	}
	else if (a->category() & (alert::peer_notification | alert::storage_notification))
	{
		str += esc("33");
	}
#endif
	str += "[";
	str += time_now_string();
	str += "] ";
	str += a->message();
#ifdef ANSI_TERMINAL_COLORS
	str += esc("0");
#endif

	if (g_log_file)
		fprintf(g_log_file, "[%s] %s\n", time_now_string(),  a->message().c_str());
}

int save_file(std::string const& filename, std::vector<char>& v)
{
	using namespace libtorrent;

	file f;
	error_code ec;
	if (!f.open(filename, file::write_only, ec)) return -1;
	if (ec) return -1;
	file::iovec_t b = {&v[0], v.size()};
	size_type written = f.writev(0, &b, 1, ec);
	if (written != int(v.size())) return -3;
	if (ec) return -3;
	return 0;
}

// returns true if the alert was handled (and should not be printed to the log)
// returns false if the alert was not handled
bool handle_alert(libtorrent::session& ses, libtorrent::alert* a
	, handles_t& files, std::set<libtorrent::torrent_handle>& non_files
	, int* counters, boost::unordered_set<torrent_status>& all_handles
	, std::vector<torrent_status const*>& filtered_handles
	, bool& need_resort)
{
	using namespace libtorrent;

#ifdef TORRENT_USE_OPENSSL
	if (torrent_need_cert_alert* p = alert_cast<torrent_need_cert_alert>(a))
	{
		torrent_handle h = p->handle;
		error_code ec;
		file_status st;
		std::string cert = combine_path("certificates", to_hex(h.info_hash().to_string())) + ".pem";
		std::string priv = combine_path("certificates", to_hex(h.info_hash().to_string())) + "_key.pem";
		stat_file(cert, &st, ec);
		if (ec)
		{
			char msg[256];
			snprintf(msg, sizeof(msg), "ERROR. could not load certificate %s: %s\n", cert.c_str(), ec.message().c_str());
			if (g_log_file) fprintf(g_log_file, "[%s] %s\n", time_now_string(), msg);
			return true;
		}
		stat_file(priv, &st, ec);
		if (ec)
		{
			char msg[256];
			snprintf(msg, sizeof(msg), "ERROR. could not load private key %s: %s\n", priv.c_str(), ec.message().c_str());
			if (g_log_file) fprintf(g_log_file, "[%s] %s\n", time_now_string(), msg);
			return true;
		}

		char msg[256];
		snprintf(msg, sizeof(msg), "loaded certificate %s and key %s\n", cert.c_str(), priv.c_str());
		if (g_log_file) fprintf(g_log_file, "[%s] %s\n", time_now_string(), msg);

		h.set_ssl_certificate(cert, priv, "certificates/dhparams.pem", "1234");
		h.resume();
	}
#endif

	boost::intrusive_ptr<torrent_info> ti;

	if (metadata_received_alert* p = alert_cast<metadata_received_alert>(a))
	{
		// if we have a monitor dir, save the .torrent file we just received in it
		// also, add it to the files map, and remove it from the non_files list
		// to keep the scan dir logic in sync so it's not removed, or added twice
		torrent_handle h = p->handle;
		if (h.is_valid()) {
			if (!ti) ti = h.torrent_file();
			create_torrent ct(*ti);
			entry te = ct.generate();
			std::vector<char> buffer;
			bencode(std::back_inserter(buffer), te);
			std::string filename = ti->name() + "." + to_hex(ti->info_hash().to_string()) + ".torrent";
			filename = combine_path(monitor_dir, filename);
			save_file(filename, buffer);

			files.insert(std::pair<std::string, libtorrent::torrent_handle>(filename, h));
			non_files.erase(h);
		}
	}
	else if (add_torrent_alert* p = alert_cast<add_torrent_alert>(a))
	{
		std::string filename;
		if (p->params.userdata)
		{
			filename = (char*)p->params.userdata;
			free(p->params.userdata);
		}

		if (p->error)
		{
			fprintf(stderr, "failed to add torrent: %s %s\n", filename.c_str(), p->error.message().c_str());
		}
		else
		{
			torrent_handle h = p->handle;

			if (!filename.empty())
				files.insert(std::pair<const std::string, torrent_handle>(filename, h));
			else
				non_files.insert(h);

			h.set_max_connections(max_connections_per_torrent);
			h.set_max_uploads(-1);
			h.set_upload_limit(torrent_upload_limit);
			h.set_download_limit(torrent_download_limit);
#ifndef TORRENT_NO_DEPRECATE
			h.use_interface(outgoing_interface.c_str());
#endif
#ifndef TORRENT_DISABLE_RESOLVE_COUNTRIES
			h.resolve_countries(true);
#endif

			// if we have a peer specified, connect to it
			if (!peer.empty())
			{
				char* port = (char*) strrchr((char*)peer.c_str(), ':');
				if (port > 0)
				{
					*port++ = 0;
					char const* ip = peer.c_str();
					int peer_port = atoi(port);
					error_code ec;
					if (peer_port > 0)
						h.connect_peer(tcp::endpoint(address::from_string(ip, ec), peer_port));
				}
			}

			boost::unordered_set<torrent_status>::iterator j
				= all_handles.insert(h.status()).first;
			if (show_torrent(*j, torrent_filter, counters))
			{
				filtered_handles.push_back(&*j);
				need_resort = true;
			}
		}
	}
	else if (torrent_finished_alert* p = alert_cast<torrent_finished_alert>(a))
	{
		p->handle.set_max_connections(max_connections_per_torrent / 2);

		// write resume data for the finished torrent
		// the alert handler for save_resume_data_alert
		// will save it to disk
		torrent_handle h = p->handle;
		h.save_resume_data();
		++num_outstanding_resume_data;
	}
	else if (save_resume_data_alert* p = alert_cast<save_resume_data_alert>(a))
	{
		--num_outstanding_resume_data;
		torrent_handle h = p->handle;
		TORRENT_ASSERT(p->resume_data);
		if (p->resume_data)
		{
			std::vector<char> out;
			bencode(std::back_inserter(out), *p->resume_data);
			torrent_status st = h.status(torrent_handle::query_save_path);
			save_file(combine_path(st.save_path, combine_path(".resume", to_hex(st.info_hash.to_string()) + ".resume")), out);
			if (h.is_valid()
				&& non_files.find(h) == non_files.end()
				&& std::find_if(files.begin(), files.end()
					, boost::bind(&handles_t::value_type::second, _1) == h) == files.end())
				ses.remove_torrent(h);
		}
	}
	else if (save_resume_data_failed_alert* p = alert_cast<save_resume_data_failed_alert>(a))
	{
		--num_outstanding_resume_data;
		torrent_handle h = p->handle;
		if (h.is_valid()
			&& non_files.find(h) == non_files.end()
			&& std::find_if(files.begin(), files.end()
				, boost::bind(&handles_t::value_type::second, _1) == h) == files.end())
			ses.remove_torrent(h);
	}
	else if (torrent_paused_alert* p = alert_cast<torrent_paused_alert>(a))
	{
		// write resume data for the finished torrent
		// the alert handler for save_resume_data_alert
		// will save it to disk
		torrent_handle h = p->handle;
		h.save_resume_data();
		++num_outstanding_resume_data;
	}
	else if (state_update_alert* p = alert_cast<state_update_alert>(a))
	{
		bool need_filter_update = false;
		for (std::vector<torrent_status>::iterator i = p->status.begin();
			i != p->status.end(); ++i)
		{
			boost::unordered_set<torrent_status>::iterator j = all_handles.find(*i);
			// don't add new entries here, that's done in the handler
			// for add_torrent_alert
			if (j == all_handles.end()) continue;
			if (j->state != i->state
				|| j->paused != i->paused
				|| j->auto_managed != i->auto_managed)
				need_filter_update = true;
			((torrent_status&)*j) = *i;
		}
		if (need_filter_update)
			update_filtered_torrents(all_handles, filtered_handles, counters);

		return true;
	}
	return false;
}

void print_piece(libtorrent::partial_piece_info* pp
	, libtorrent::cached_piece_info* cs
	, std::vector<libtorrent::peer_info> const& peers
	, std::string& out)
{
	using namespace libtorrent;

	char str[1024];
	assert(pp == 0 || cs == 0 || cs->piece == pp->piece_index);
	int piece = pp ? pp->piece_index : cs->piece;
	int num_blocks = pp ? pp->blocks_in_piece : cs->blocks.size();

	snprintf(str, sizeof(str), "%5d: [", piece);
	out += str;
	char const* last_color = 0;
	for (int j = 0; j < num_blocks; ++j)
	{
		int index = pp ? peer_index(pp->blocks[j].peer(), peers) % 36 : -1;
		char chr = '+';
		if (index >= 0)
			chr = (index < 10)?'0' + index:'A' + index - 10;

		char const* color = "";

		if (pp == 0)
		{
			color = cs->blocks[j] ? esc("34;7") : esc("0");
			chr = ' ';
		}
		else
		{
#ifdef ANSI_TERMINAL_COLORS
			if (cs && cs->blocks[j]) color = esc("36;7");
			else if (pp->blocks[j].bytes_progress > 0
					&& pp->blocks[j].state == block_info::requested)
			{
				if (pp->blocks[j].num_peers > 1) color = esc("1;7");
				else color = esc("33;7");
				chr = '0' + (pp->blocks[j].bytes_progress * 10 / pp->blocks[j].block_size);
			}
			else if (pp->blocks[j].state == block_info::finished) color = esc("32;7");
			else if (pp->blocks[j].state == block_info::writing) color = esc("36;7");
			else if (pp->blocks[j].state == block_info::requested) color = esc("0");
			else { color = esc("0"); chr = ' '; }
#else
			if (cs && cs->blocks[j]) chr = 'c';
			else if (pp->blocks[j].state == block_info::finished) chr = '#';
			else if (pp->blocks[j].state == block_info::writing) chr = '+';
			else if (pp->blocks[j].state == block_info::requested) chr = '-';
			else chr = ' ';
#endif
		}
		if (last_color == 0 || strcmp(last_color, color) != 0)
			snprintf(str, sizeof(str), "%s%c", color, chr);
		else
			out += chr;

		out += str;
	}
#ifdef ANSI_TERMINAL_COLORS
	out += esc("0");
#endif
	char const* piece_state[4] = {"", " slow", " medium", " fast"};
	snprintf(str, sizeof(str), "] %3d cache age: %-.1f %s\n"
		, cs ? cs->next_to_hash : 0
		, cs ? (total_milliseconds(time_now() - cs->last_use) / 1000.f) : 0.f
		, pp ? piece_state[pp->piece_state] : "");
	out += str;
}

static char const* state_str[] =
	{"checking (q)", "checking", "dl metadata"
	, "downloading", "finished", "seeding", "allocating", "checking (r)"};

int main(int argc, char* argv[])
{
	if (argc == 1)
	{
		fprintf(stderr, "usage: client_test [OPTIONS] [TORRENT|MAGNETURL|URL]\n\n"
			"OPTIONS:\n"
			"\n CLIENT OPTIONS\n"
			"  -f <log file>         logs all events to the given file\n"
			"  -s <path>             sets the save path for downloads\n"
			"  -m <path>             sets the .torrent monitor directory\n"
			"  -t <seconds>          sets the scan interval of the monitor dir\n"
			"  -F <milliseconds>     sets the UI refresh rate. This is the number of\n"
			"                        milliseconds between screen refreshes.\n"
			"  -q <num loops>        automatically quit the client after <num loops> of refreshes\n"
			"                        this is useful for scripting tests\n"
			"  -k                    enable high performance settings. This overwrites any other\n"
			"                        previous command line options, so be sure to specify this first\n"
			"  -G                    Add torrents in seed-mode (i.e. assume all pieces\n"
			"                        are present and check hashes on-demand)\n"
			"\n BITTORRENT OPTIONS\n"
			"  -c <limit>            sets the max number of connections\n"
			"  -T <limit>            sets the max number of connections per torrent\n"
			"  -U <rate>             sets per-torrent upload rate\n"
			"  -D <rate>             sets per-torrent download rate\n"
			"  -d <rate>             limits the download rate\n"
			"  -u <rate>             limits the upload rate\n"
			"  -S <limit>            limits the upload slots\n"
			"  -A <num pieces>       allowed pieces set size\n"
			"  -H                    Don't start DHT\n"
			"  -X                    Don't start local peer discovery\n"
			"  -n                    announce to trackers in all tiers\n"
			"  -W <num peers>        Set the max number of peers to keep in the peer list\n"
			"  -B <seconds>          sets the peer timeout\n"
			"  -Q                    enables share mode. Share mode attempts to maximize\n"
			"                        share ratio rather than downloading\n"
			"  -r <IP:port>          connect to specified peer\n"
#ifndef TORRENT_DISABLE_ENCRYPTION
			"  -e                    force encrypted bittorrent connections\n"
#endif
			"\n QUEING OPTIONS\n"
			"  -v <limit>            Set the max number of active downloads\n"
			"  -^ <limit>            Set the max number of active seeds\n"
			"\n NETWORK OPTIONS\n"
			"  -p <port>             sets the listen port\n"
			"  -o <limit>            limits the number of simultaneous\n"
			"                        half-open TCP connections to the\n"
			"                        given number.\n"
			"  -w <seconds>          sets the retry time for failed web seeds\n"
			"  -x <file>             loads an emule IP-filter file\n"
			"  -P <host:port>        Use the specified SOCKS5 proxy\n"
			"  -L <user:passwd>      Use the specified username and password for the\n"
			"                        proxy specified by -P\n"
			"  -h                    allow multiple connections from the same IP\n"
			"  -M                    Disable TCP/uTP bandwidth balancing\n"
			"  -N                    Do not attempt to use UPnP and NAT-PMP to forward ports\n"
			"  -Y                    Rate limit local peers\n"
			"  -y                    Disable TCP connections (disable outgoing TCP and reject\n"
			"                        incoming TCP connections)\n"
			"  -b <IP>               sets IP of the interface to bind the\n"
			"                        listen socket to\n"
			"  -I <IP>               sets the IP of the interface to bind\n"
			"                        outgoing peer connections to\n"
#if TORRENT_USE_I2P
			"  -i <i2p-host>         the hostname to an I2P SAM bridge to use\n"
#endif
			"  -l <limit>            sets the listen socket queue size\n"
			"\n DISK OPTIONS\n"
			"  -a <mode>             sets the allocation mode. [sparse|full]\n"
			"  -R <num blocks>       number of blocks per read cache line\n"
			"  -C <limit>            sets the max cache size. Specified in 16kB blocks\n"
			"  -O                    Disallow disk job reordering\n"
			"  -j                    disable disk read-ahead\n"
			"  -z                    disable piece hash checks (used for benchmarking)\n"
			"  -0                    disable disk I/O, read garbage and don't flush to disk\n"
			"\n\n"
			"TORRENT is a path to a .torrent file\n"
			"MAGNETURL is a magnet link\n"
			"URL is a url to a torrent file\n"
			"\n"
			"Example for running benchmark:\n\n"
			"  client_test -k -z -N -h -H -M -l 2000 -S 1000 -T 1000 -c 1000 test.torrent\n");
			;
		return 0;
	}

	using namespace libtorrent;
	session_settings settings;

	proxy_settings ps;

	int refresh_delay = 1000;
	bool start_dht = true;
	bool start_upnp = true;
	bool start_lsd = true;
	int loop_limit = 0;

	std::deque<std::string> events;

	ptime next_dir_scan = time_now();

	// the string is the filename of the .torrent file, but only if
	// it was added through the directory monitor. It is used to
	// be able to remove torrents that were added via the directory
	// monitor when they're not in the directory anymore.
	boost::unordered_set<torrent_status> all_handles;
	std::vector<torrent_status const*> filtered_handles;

	handles_t files;
	// torrents that were not added via the monitor dir
	std::set<torrent_handle> non_files;

	int counters[torrents_max];
	memset(counters, 0, sizeof(counters));

	session ses(fingerprint("LT", LIBTORRENT_VERSION_MAJOR, LIBTORRENT_VERSION_MINOR, 0, 0)
		, session::add_default_plugins
		, alert::all_categories
			& ~(alert::dht_notification
			+ alert::progress_notification
			+ alert::debug_notification
			+ alert::stats_notification));

	std::vector<char> in;
	error_code ec;
	if (load_file(".ses_state", in, ec) == 0)
	{
		lazy_entry e;
		if (lazy_bdecode(&in[0], &in[0] + in.size(), e, ec) == 0)
			ses.load_state(e);
	}

#ifndef TORRENT_DISABLE_GEO_IP
	ses.load_asnum_db("GeoIPASNum.dat");
	ses.load_country_db("GeoIP.dat");
#endif

	// load the torrents given on the commandline

	std::vector<add_torrent_params> magnet_links;
	std::vector<std::string> torrents;

	for (int i = 1; i < argc; ++i)
	{
		if (argv[i][0] != '-')
		{
			// match it against the <hash>@<tracker> format
			if (strlen(argv[i]) > 45
				&& ::is_hex(argv[i], 40)
				&& (strncmp(argv[i] + 40, "@http://", 8) == 0
					|| strncmp(argv[i] + 40, "@udp://", 7) == 0))
			{
				sha1_hash info_hash;
				from_hex(argv[i], 40, (char*)&info_hash[0]);

				add_torrent_params p;
				if (seed_mode) p.flags |= add_torrent_params::flag_seed_mode;
				if (disable_storage) p.storage = disabled_storage_constructor;
				if (share_mode) p.flags |= add_torrent_params::flag_share_mode;
				p.trackers.push_back(argv[i] + 41);
				p.info_hash = info_hash;
				p.save_path = save_path;
				p.storage_mode = (storage_mode_t)allocation_mode;
				p.flags |= add_torrent_params::flag_paused;
				p.flags &= ~add_torrent_params::flag_duplicate_is_error;
				p.flags |= add_torrent_params::flag_auto_managed;
				magnet_links.push_back(p);
				continue;
			}

			torrents.push_back(argv[i]);
			continue;
		}

		// if there's a flag but no argument following, ignore it
		if (argc == i) continue;
		char const* arg = argv[i+1];
		switch (argv[i][1])
		{
			case 'f': g_log_file = fopen(arg, "w+"); break;
			case 'o': settings.half_open_limit = atoi(arg); break;
			case 'h': settings.allow_multiple_connections_per_ip = true; --i; break;
			case 'p': listen_port = atoi(arg); break;
			case 'k': settings = high_performance_seed(); --i; break;
			case 'j': settings.use_disk_read_ahead = false; --i; break;
			case 'z': settings.disable_hash_checks = true; --i; break;
			case 'B': settings.peer_timeout = atoi(arg); break;
			case 'n': settings.announce_to_all_tiers = true; --i; break;
			case 'G': seed_mode = true; --i; break;
			case 'd': settings.download_rate_limit = atoi(arg) * 1000; break;
			case 'u': settings.upload_rate_limit = atoi(arg) * 1000; break;
			case 'S': settings.unchoke_slots_limit = atoi(arg); break;
			case 'a':
				if (strcmp(arg, "allocate") == 0) allocation_mode = storage_mode_allocate;
				if (strcmp(arg, "sparse") == 0) allocation_mode = storage_mode_sparse;
				break;
			case 's': save_path = arg; break;
			case 'U': torrent_upload_limit = atoi(arg) * 1000; break;
			case 'D': torrent_download_limit = atoi(arg) * 1000; break;
			case 'm': monitor_dir = arg; break;
			case 'Q': share_mode = true; --i; break;
			case 'b': bind_to_interface = arg; break;
			case 'w': settings.urlseed_wait_retry = atoi(arg); break;
			case 't': poll_interval = atoi(arg); break;
			case 'F': refresh_delay = atoi(arg); break;
			case 'H': start_dht = false; --i; break;
			case 'l': settings.listen_queue_size = atoi(arg); break;
#ifndef TORRENT_DISABLE_ENCRYPTION
			case 'e':
				{
					pe_settings s;
	
					s.out_enc_policy = libtorrent::pe_settings::forced;
					s.in_enc_policy = libtorrent::pe_settings::forced;
					s.allowed_enc_level = pe_settings::rc4;
					s.prefer_rc4 = true;
					ses.set_pe_settings(s);
					--i;
					break;
				}
#endif
			case 'W':
				settings.max_peerlist_size = atoi(arg);
				settings.max_paused_peerlist_size = atoi(arg) / 2;
				break;
			case 'x':
				{
					FILE* filter = fopen(arg, "r");
					if (filter)
					{
						ip_filter fil;
						unsigned int a,b,c,d,e,f,g,h, flags;
						while (fscanf(filter, "%u.%u.%u.%u - %u.%u.%u.%u %u\n", &a, &b, &c, &d, &e, &f, &g, &h, &flags) == 9)
						{
							address_v4 start((a << 24) + (b << 16) + (c << 8) + d);
							address_v4 last((e << 24) + (f << 16) + (g << 8) + h);
							if (flags <= 127) flags = ip_filter::blocked;
							else flags = 0;
							fil.add_rule(start, last, flags);
						}
						ses.set_ip_filter(fil);
						fclose(filter);
					}
				}
				break;
			case 'c': settings.connections_limit = atoi(arg); break;
			case 'T': max_connections_per_torrent = atoi(arg); break;
#if TORRENT_USE_I2P
			case 'i':
				{
					proxy_settings ps;
					ps.hostname = arg;
					ps.port = 7656; // default SAM port
					ps.type = proxy_settings::i2p_proxy;
					ses.set_i2p_proxy(ps);
					break;
				}
#endif // TORRENT_USE_I2P
			case 'C':
				settings.cache_size = atoi(arg);
				settings.use_read_cache = settings.cache_size > 0;
				settings.cache_buffer_chunk_size = settings.cache_size / 100;
				break;
			case 'A': settings.allowed_fast_set_size = atoi(arg); break;
			case 'R': settings.read_cache_line_size = atoi(arg); break;
			case 'O': settings.allow_reordered_disk_operations = false; --i; break;
			case 'M': settings.mixed_mode_algorithm = session_settings::prefer_tcp; --i; break;
			case 'y': settings.enable_outgoing_tcp = false; settings.enable_incoming_tcp = false; --i; break;
			case 'r': peer = arg; break;
			case 'P':
				{
					char* port = (char*) strrchr(arg, ':');
					if (port == 0)
					{
						fprintf(stderr, "invalid proxy hostname, no port found\n");
						break;
					}
					*port++ = 0;
					ps.hostname = arg;
					ps.port = atoi(port);
					if (ps.port == 0) {
						fprintf(stderr, "invalid proxy port\n");
						break;
					}
					if (ps.type == proxy_settings::none)
						ps.type = proxy_settings::socks5;
				}
				break;
			case 'L':
				{
					char* pw = (char*) strchr(arg, ':');
					if (pw == 0)
					{
						fprintf(stderr, "invalid proxy username and password specified\n");
						break;
					}
					*pw++ = 0;
					ps.username = arg;
					ps.password = pw;
					ps.type = proxy_settings::socks5_pw;
				}
				break;
			case 'I': outgoing_interface = arg; break;
			case 'N': start_upnp = false; --i; break;
			case 'X': start_lsd = false; --i; break;
			case 'Y': settings.ignore_limits_on_local_network = false; --i; break;
			case 'v': settings.active_downloads = atoi(arg);
				settings.active_limit = (std::max)(atoi(arg) * 2, settings.active_limit);
				break;
			case '^':
				settings.active_seeds = atoi(arg);
				settings.active_limit = (std::max)(atoi(arg) * 2, settings.active_limit);
				break;
			case 'q': loop_limit = atoi(arg); break;
			case '0': disable_storage = true; --i;
		}
		++i; // skip the argument
	}

	// create directory for resume files
	create_directory(combine_path(save_path, ".resume"), ec);
	if (ec)
		fprintf(stderr, "failed to create resume file directory: %s\n", ec.message().c_str());

	if (start_lsd)
		ses.start_lsd();

	if (start_upnp)
	{
		ses.start_upnp();
		ses.start_natpmp();
	}

	ses.set_proxy(ps);

	ses.listen_on(std::make_pair(listen_port, listen_port)
		, ec, bind_to_interface.c_str());
	if (ec)
	{
		fprintf(stderr, "failed to listen%s%s on ports %d-%d: %s\n"
			, bind_to_interface.empty() ? "" : " on ", bind_to_interface.c_str()
			, listen_port, listen_port+1, ec.message().c_str());
	}

#ifndef TORRENT_DISABLE_DHT
	if (start_dht)
	{
		settings.use_dht_as_fallback = false;

		ses.add_dht_router(std::make_pair(
			std::string("router.bittorrent.com"), 6881));
		ses.add_dht_router(std::make_pair(
			std::string("router.utorrent.com"), 6881));
		ses.add_dht_router(std::make_pair(
			std::string("router.bitcomet.com"), 6881));

		ses.start_dht();
	}
#endif

	settings.user_agent = "client_test/" LIBTORRENT_VERSION;
	settings.choking_algorithm = session_settings::auto_expand_choker;
	settings.disk_cache_algorithm = session_settings::avoid_readback;
	settings.volatile_read_cache = false;

	ses.set_settings(settings);

	for (std::vector<add_torrent_params>::iterator i = magnet_links.begin()
		, end(magnet_links.end()); i != end; ++i)
	{
		ses.async_add_torrent(*i);
	}

	for (std::vector<std::string>::iterator i = torrents.begin()
		, end(torrents.end()); i != end; ++i)
	{
		if (std::strstr(i->c_str(), "http://") == i->c_str()
			|| std::strstr(i->c_str(), "https://") == i->c_str()
			|| std::strstr(i->c_str(), "magnet:") == i->c_str())
		{
			add_torrent_params p;
			if (seed_mode) p.flags |= add_torrent_params::flag_seed_mode;
			if (disable_storage) p.storage = disabled_storage_constructor;
			if (share_mode) p.flags |= add_torrent_params::flag_share_mode;
			p.save_path = save_path;
			p.storage_mode = (storage_mode_t)allocation_mode;
			p.url = *i;

			std::vector<char> buf;
			if (std::strstr(i->c_str(), "magnet:") == i->c_str())
			{
				add_torrent_params tmp;
				ec.clear();
				parse_magnet_uri(*i, tmp, ec);

				if (ec) continue;

				std::string filename = combine_path(save_path, combine_path(".resume"
					, to_hex(tmp.info_hash.to_string()) + ".resume"));

				load_file(filename.c_str(), p.resume_data, ec);
			}

			printf("adding URL: %s\n", i->c_str());
			ses.async_add_torrent(p);
			continue;
		}

		// if it's a torrent file, open it as usual
		add_torrent(ses, files, non_files, i->c_str()
			, allocation_mode, save_path, false
			, torrent_upload_limit, torrent_download_limit);
	}

	// main loop
	std::vector<peer_info> peers;
	std::vector<partial_piece_info> queue;

	int tick = 0;

	while (loop_limit > 1 || loop_limit == 0)
	{
		++tick;
		ses.post_torrent_updates();
		if (active_torrent >= int(filtered_handles.size())) active_torrent = filtered_handles.size() - 1;
		if (active_torrent >= 0)
		{
			// ask for distributed copies for the selected torrent. Since this
			// is a somewhat expensive operation, don't do it by default for
			// all torrents
			torrent_status const& h = *filtered_handles[active_torrent];
			h.handle.status(
				torrent_handle::query_distributed_copies
				| torrent_handle::query_pieces
				| torrent_handle::query_verified_pieces);
		}

		std::vector<feed_handle> feeds;
		ses.get_feeds(feeds);

		counters[torrents_feeds] = feeds.size();

		std::sort(filtered_handles.begin(), filtered_handles.end(), &compare_torrent);

		if (loop_limit > 1) --loop_limit;
		int c = 0;
		while (sleep_and_input(&c, refresh_delay))
		{
			if (c == EOF) { break; }
			if (c == 27)
			{
				// escape code, read another character
#ifdef _WIN32
				c = _getch();
#else
				int c = getc(stdin);
#endif
				if (c == EOF) { break; }
				if (c != '[') continue;
#ifdef _WIN32
				c = _getch();
#else
				c = getc(stdin);
#endif
				if (c == EOF) break;

				if (c == 68)
				{
					// arrow left
					if (torrent_filter > 0)
					{
						--torrent_filter;
						update_filtered_torrents(all_handles, filtered_handles, counters);
					}
				}
				else if (c == 67)
				{
					// arrow right
					if (torrent_filter < torrents_max - 1)
					{
						++torrent_filter;
						update_filtered_torrents(all_handles, filtered_handles, counters);
					}
				}
				else if (c == 65)
				{
					// arrow up
					--active_torrent;
					if (active_torrent < 0) active_torrent = 0;
				}
				else if (c == 66)
				{
					// arrow down
					++active_torrent;
					if (active_torrent >= int(filtered_handles.size()))
						active_torrent = filtered_handles.size() - 1;
				}
			}

			if (c == ' ')
			{
				if (ses.is_paused()) ses.resume();
				else ses.pause();
			}

			// add magnet link
			if (c == 'm')
			{
				char url[4096];
				puts("Enter magnet link:\n");
				scanf("%4096s", url);

				add_torrent_params p;
				if (seed_mode) p.flags |= add_torrent_params::flag_seed_mode;
				if (disable_storage) p.storage = disabled_storage_constructor;
				if (share_mode) p.flags |= add_torrent_params::flag_share_mode;
				p.save_path = save_path;
				p.storage_mode = (storage_mode_t)allocation_mode;
				p.url = url;

				std::vector<char> buf;
				if (std::strstr(url, "magnet:") == url)
				{
					add_torrent_params tmp;
					parse_magnet_uri(url, tmp, ec);

					if (ec) continue;

					std::string filename = combine_path(save_path, combine_path(".resume"
						, to_hex(tmp.info_hash.to_string()) + ".resume"));

					load_file(filename.c_str(), p.resume_data, ec);
				}

				printf("adding URL: %s\n", url);
				ses.async_add_torrent(p);
			}

			if (c == 'q') break;

			if (c == 'D')
			{
				torrent_status const& st = get_active_torrent(filtered_handles);
				if (st.handle.is_valid())
				{
					printf("\n\nARE YOU SURE YOU WANT TO DELETE THE FILES FOR '%s'. THIS OPERATION CANNOT BE UNDONE. (y/N)"
						, st.name.c_str());
					char response = 'n';
					scanf("%c", &response);
					if (response == 'y')
					{
						// also delete the .torrent file from the torrent directory
						handles_t::iterator i = std::find_if(files.begin(), files.end()
							, boost::bind(&handles_t::value_type::second, _1) == st.handle);
						if (i != files.end())
						{
							error_code ec;
							std::string path;
							if (is_complete(i->first)) path = i->first;
							else path = combine_path(monitor_dir, i->first);
							remove(path, ec);
							if (ec) printf("failed to delete .torrent file: %s\n", ec.message().c_str());
							files.erase(i);
						}
						if (st.handle.is_valid())
							ses.remove_torrent(st.handle, session::delete_files);
					}
				}
			}

			if (c == 'j' && !filtered_handles.empty())
			{
				get_active_torrent(filtered_handles).handle.force_recheck();
			}

			if (c == 'r' && !filtered_handles.empty())
			{
				get_active_torrent(filtered_handles).handle.force_reannounce();
			}

			if (c == 's' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				ts.handle.set_sequential_download(!ts.sequential_download);
			}

			if (c == 'R')
			{
				// save resume data for all torrents
				for (std::vector<torrent_status const*>::iterator i = filtered_handles.begin()
					, end(filtered_handles.end()); i != end; ++i)
				{
					if ((*i)->need_save_resume)
					{
						(*i)->handle.save_resume_data();
						++num_outstanding_resume_data;
					}
				}
			}

			if (c == 'o' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				int num_pieces = ts.num_pieces;
				if (num_pieces > 300) num_pieces = 300;
				for (int i = 0; i < num_pieces; ++i)
				{
					ts.handle.set_piece_deadline(i, (i+5) * 1000, torrent_handle::alert_when_available);
				}
			}

			if (c == 'v' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				ts.handle.scrape_tracker();
			}

			if (c == 'p' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				if (!ts.auto_managed && ts.paused)
				{
					ts.handle.auto_managed(true);
				}
				else
				{
					ts.handle.auto_managed(false);
					ts.handle.pause(torrent_handle::graceful_pause);
				}
			}

			// toggle force-start
			if (c == 'k' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				ts.handle.auto_managed(!ts.auto_managed);
				if (ts.auto_managed && ts.paused) ts.handle.resume();
			}

			if (c == 'c' && !filtered_handles.empty())
			{
				torrent_status const& ts = get_active_torrent(filtered_handles);
				ts.handle.clear_error();
			}

			// toggle displays
			if (c == 't') print_trackers = !print_trackers;
			if (c == 'i') print_peers = !print_peers;
			if (c == 'l') print_log = !print_log;
			if (c == 'd') print_downloads = !print_downloads;
			if (c == 'f') print_file_progress = !print_file_progress;
			if (c == 'P') show_pad_files = !show_pad_files;
			if (c == 'a') print_piece_bar = !print_piece_bar;
			if (c == 'g') show_dht_status = !show_dht_status;
			if (c == 'u') print_utp_stats = !print_utp_stats;
			// toggle columns
			if (c == '1') print_ip = !print_ip;
			if (c == '2') print_as = !print_as;
			if (c == '3') print_timers = !print_timers;
			if (c == '4') print_block = !print_block;
			if (c == '5') print_peer_rate = !print_peer_rate;
			if (c == '6') print_fails = !print_fails;
			if (c == '7') print_send_bufs = !print_send_bufs;
			if (c == 'y')
			{
				char url[2048];
				puts("Enter RSS feed URL:\n");
				scanf("%2048s", url);
				feed_settings set;
				set.url = url;
				set.add_args.save_path = save_path;
				feed_handle h = ses.add_feed(set);
				h.update_feed();
			}
			if (c == 'h')
			{
				clear_home();
				puts(
					"HELP SCREEN (press any key to dismiss)\n\n"
					"CLIENT OPTIONS\n"
					"[q] quit client                                 [m] add magnet link\n"
					"[y] add RSS feed\n"
					"\n"
					"TORRENT ACTIONS\n"
					"[p] pause/unpause selected torrent\n"
					"[s] toggle sequential download                  [j] force recheck\n"
					"[space] toggle session pause                    [c] clear error\n"
					"[v] scrape                                      [D] delete torrent and data\n"
					"[r] force reannounce                            [R] save resume data for all torrents\n"
					"[o] set piece deadlines (sequential dl)         [P] toggle auto-managed\n"
					"[k] toggle force-started\n"
					"\n"
					"DISPLAY OPTIONS\n"
					"left/right arrow keys: select torrent filter\n"
					"up/down arrow keys: select torrent\n"
					"[i] toggle show peers                           [d] toggle show downloading pieces\n"
					"[a] toggle piece bar                            [f] toggle show files\n"
					"[g] show DHT                                    [x] toggle disk cache stats\n"
					"[t] show trackers                               [l] show alert log\n"
					"[P] show pad files (in file list)               [u] show uTP stats\n"
					"\n"
					"COLUMN OPTIONS\n"
					"[1] toggle IP column                            [2] toggle AS column\n"
					"[3] toggle timers column                        [4] toggle block progress column\n"
					"[5] toggle peer rate column                     [6] toggle failures column\n"
					"[7] toggle send buffers column\n"
					);
				int tmp;
				while (sleep_and_input(&tmp, 500) == false);
			}
		}
		if (c == 'q') break;

		int terminal_width = 80;
		int terminal_height = 50;

#ifndef _WIN32
		{
			winsize size;
			int ret = ioctl(STDOUT_FILENO, TIOCGWINSZ, (char*)&size);
			if (ret == 0)
			{
				terminal_width = size.ws_col;
				terminal_height = size.ws_row;

				if (terminal_width < 64)
					terminal_width = 64;
				if (terminal_height < 25)
					terminal_height = 25;
			}
			else
			{
				terminal_width = 190;
				terminal_height = 100;
			}
		}
#endif

		int max_lines = terminal_height - 15;

		// loop through the alert queue to see if anything has happened.
		std::deque<alert*> alerts;
		ses.pop_alerts(&alerts);
		std::string now = time_now_string();
		for (std::deque<alert*>::iterator i = alerts.begin()
			, end(alerts.end()); i != end; ++i)
		{
			bool need_resort = false;
			TORRENT_TRY
			{
				if (!::handle_alert(ses, *i, files, non_files, counters
					, all_handles, filtered_handles, need_resort))
				{
					// if we didn't handle the alert, print it to the log
					std::string event_string;
					print_alert(*i, event_string);
					events.push_back(event_string);
					if (events.size() >= 20) events.pop_front();
				}
			} TORRENT_CATCH(std::exception& e) {}

			if (need_resort)
			{
				std::sort(filtered_handles.begin(), filtered_handles.end()
					, &compare_torrent);
			}

			delete *i;
		}
		alerts.clear();

		session_status sess_stat = ses.status();

		// in test mode, also quit when we loose the last peer
		if (loop_limit > 1 && sess_stat.num_peers == 0 && tick > 30) break;

		std::string out;
		out = "[h] show key mappings\n";

		char const* filter_names[] = { "all", "downloading", "non-paused", "seeding", "queued", "stopped", "checking", "RSS"};
		for (int i = 0; i < int(sizeof(filter_names)/sizeof(filter_names[0])); ++i)
		{
			char filter[200];
			snprintf(filter, sizeof(filter), "%s[%s (%d)]%s", torrent_filter == i?esc("7"):""
				, filter_names[i], counters[i], torrent_filter == i?esc("0"):"");
			out += filter;
		}
		out += '\n';

		char str[500];
		int torrent_index = 0;
		int lines_printed = 3;

		if (torrent_filter == torrents_feeds)
		{
			for (std::vector<feed_handle>::iterator i = feeds.begin()
				, end(feeds.end()); i != end; ++i)
			{
				if (lines_printed >= max_lines)
				{
					out += "...\n";
					break;
				}

				feed_status st = i->get_feed_status();
				if (st.url.size() > 70) st.url.resize(70);

				char update_timer[20];
				snprintf(update_timer, sizeof(update_timer), "%d", st.next_update);
				snprintf(str, sizeof(str), "%-70s %s (%2d) %s\n", st.url.c_str()
					, st.updating ? "updating" : update_timer
					, int(st.items.size())
					, st.error ? st.error.message().c_str() : "");
				out += str;
				++lines_printed;
			}
		}

		// handle scrolling down when moving the cursor
		// below the fold
		static int start_offset = 0;
		if (active_torrent >= max_lines - lines_printed - start_offset)
			start_offset = active_torrent - max_lines + lines_printed + 1;
		if (active_torrent < start_offset) start_offset = active_torrent;

		for (std::vector<torrent_status const*>::iterator i = filtered_handles.begin();
			i != filtered_handles.end(); ++torrent_index)
		{
			if (torrent_index < start_offset)
			{
				++i;
				continue;
			}
			if (lines_printed >= max_lines)
			{
				out += "...\n";
				break;
			}

			torrent_status const& s = **i;
			if (!s.handle.is_valid())
			{
				i = filtered_handles.erase(i);
				continue;
			}
			else
			{
				++i;
			}

#ifdef ANSI_TERMINAL_COLORS
			char const* term = "\x1b[0m";
#else
			char const* term = "";
#endif
			if (active_torrent == torrent_index)
			{
				term = "\x1b[0m\x1b[7m";
				out += esc("7");
				out += "*";
			}
			else
			{
				out += " ";
			}

			int queue_pos = s.queue_position;
			if (queue_pos == -1) out += "-  ";
			else
			{
				snprintf(str, sizeof(str), "%-3d", queue_pos);
				out += str;
			}

			if (s.paused) out += esc("34");
			else out += esc("37");

			std::string name = s.name;
			if (name.size() > 40) name.resize(40);
			snprintf(str, sizeof(str), "%-40s %s ", name.c_str(), term);
			out += str;

			if (!s.error.empty())
			{
				out += esc("31");
				out += "error ";
				out += s.error;
				out += esc("0");
				out += "\n";
				++lines_printed;
				continue;
			}

			int seeds = 0;
			int downloaders = 0;

			if (s.num_complete >= 0) seeds = s.num_complete;
			else seeds = s.list_seeds;

			if (s.num_incomplete >= 0) downloaders = s.num_incomplete;
			else downloaders = s.list_peers - s.list_seeds;

			snprintf(str, sizeof(str), "%s%-13s down: (%s%s%s) up: %s%s%s (%s%s%s) swarm: %4d:%4d"
				"  bw queue: (%d|%d) all-time (Rx: %s%s%s Tx: %s%s%s) seed rank: %x %c%s\n"
				, (!s.paused && !s.auto_managed)?"[F] ":""
				, (s.paused && !s.auto_managed)?"paused":
				  (s.paused && s.auto_managed)?"queued":
				  state_str[s.state]
				, esc("32"), add_suffix(s.total_download).c_str(), term
				, esc("31"), add_suffix(s.upload_rate, "/s").c_str(), term
				, esc("31"), add_suffix(s.total_upload).c_str(), term
				, downloaders, seeds
				, s.up_bandwidth_queue, s.down_bandwidth_queue
				, esc("32"), add_suffix(s.all_time_download).c_str(), term
				, esc("31"), add_suffix(s.all_time_upload).c_str(), term
				, s.seed_rank, s.need_save_resume?'S':' ', esc("0"));
			out += str;
			++lines_printed;

			if (torrent_index != active_torrent && s.state == torrent_status::seeding) continue;
			char const* progress_bar_color = "33"; // yellow
			if (s.state == torrent_status::downloading_metadata)
			{
				progress_bar_color = "35"; // magenta
			}
			else if (s.current_tracker.empty())
			{
				progress_bar_color = "31"; // red
			}
			else if (sess_stat.has_incoming_connections)
			{
				progress_bar_color = "32"; // green
			}

			snprintf(str, sizeof(str), "     %-10s: %s%-11"PRId64"%s Bytes %6.2f%% %s\n"
				, s.sequential_download?"sequential":"progress"
				, esc("32"), s.total_done, esc("0")
				, s.progress_ppm / 10000.f
				, progress_bar(s.progress_ppm / 1000, terminal_width - 43, progress_bar_color).c_str());
			out += str;
			++lines_printed;

			if (print_piece_bar && (s.state != torrent_status::seeding || s.seed_mode))
			{
				out += "     ";
				out += piece_bar(s.pieces, terminal_width - 7);
				out += "\n";
				++lines_printed;
				if (s.seed_mode)
				{
					out += "     ";
					out += piece_bar(s.verified_pieces, terminal_width - 7);
					out += "\n";
					++lines_printed;
				}
			}

			if (s.state != torrent_status::queued_for_checking && s.state != torrent_status::checking_files)
			{
				boost::posix_time::time_duration t = s.next_announce;
				snprintf(str, sizeof(str)
					, "     peers: %s%d%s (%s%d%s) seeds: %s%d%s distributed copies: %s%4.2f%s "
					"sparse regions: %d download: %s%s%s next announce: %s%02d:%02d:%02d%s "
					"tracker: %s%s%s\n"
					, esc("37"), s.num_peers, esc("0")
					, esc("37"), s.connect_candidates, esc("0")
					, esc("37"), s.num_seeds, esc("0")
					, esc("37"), s.distributed_copies, esc("0")
					, s.sparse_regions
					, esc("32"), add_suffix(s.download_rate, "/s").c_str(), esc("0")
					, esc("37"), int(t.hours()), int(t.minutes()), int(t.seconds()), esc("0")
					, esc("36"), s.current_tracker.c_str(), esc("0"));
				out += str;
				++lines_printed;
			}
		}

		cache_status cs = ses.get_cache_status();
		if (cs.blocks_read < 1) cs.blocks_read = 1;
		if (cs.blocks_written < 1) cs.blocks_written = 1;

		snprintf(str, sizeof(str), "==== conns: %d down: %s%s%s (%s%s%s) up: %s%s%s (%s%s%s) "
			"tcp/ip: %s%s%s %s%s%s DHT: %s%s%s %s%s%s tracker: %s%s%s %s%s%s ====\n"
			, sess_stat.num_peers
			, esc("32"), add_suffix(sess_stat.download_rate, "/s").c_str(), esc("0")
			, esc("32"), add_suffix(sess_stat.total_download).c_str(), esc("0")
			, esc("31"), add_suffix(sess_stat.upload_rate, "/s").c_str(), esc("0")
			, esc("31"), add_suffix(sess_stat.total_upload).c_str(), esc("0")
			, esc("32"), add_suffix(sess_stat.ip_overhead_download_rate, "/s").c_str(), esc("0")
			, esc("31"), add_suffix(sess_stat.ip_overhead_upload_rate, "/s").c_str(), esc("0")
			, esc("32"), add_suffix(sess_stat.dht_download_rate, "/s").c_str(), esc("0")
			, esc("31"), add_suffix(sess_stat.dht_upload_rate, "/s").c_str(), esc("0")
			, esc("32"), add_suffix(sess_stat.tracker_download_rate, "/s").c_str(), esc("0")
			, esc("31"), add_suffix(sess_stat.tracker_upload_rate, "/s").c_str(), esc("0"));
		out += str;

		snprintf(str, sizeof(str), "==== waste: %s fail: %s unchoked: %d / %d "
			"bw queues: %8d (%d) | %8d (%d) disk queues: %d | %d cache: w: %"PRId64"%% r: %"PRId64"%% "
			"size: %s (%s) / %s dq: %"PRId64" ===\n"
			, add_suffix(sess_stat.total_redundant_bytes).c_str()
			, add_suffix(sess_stat.total_failed_bytes).c_str()
			, sess_stat.num_unchoked, sess_stat.allowed_upload_slots
			, sess_stat.up_bandwidth_bytes_queue
			, sess_stat.up_bandwidth_queue
			, sess_stat.down_bandwidth_bytes_queue
			, sess_stat.down_bandwidth_queue
			, sess_stat.disk_write_queue
			, sess_stat.disk_read_queue
			, (cs.blocks_written - cs.writes) * 100 / cs.blocks_written
			, cs.blocks_read_hit * 100 / cs.blocks_read
			, add_suffix(boost::int64_t(cs.cache_size) * 16 * 1024).c_str()
			, add_suffix(boost::int64_t(cs.read_cache_size) * 16 * 1024).c_str()
			, add_suffix(boost::int64_t(cs.total_used_buffers) * 16 * 1024).c_str()
			, cs.queued_bytes);
		out += str;

		snprintf(str, sizeof(str), "==== optimistic unchoke: %d unchoke counter: %d peerlist: %d ====\n"
			, sess_stat.optimistic_unchoke_counter, sess_stat.unchoke_counter, sess_stat.peerlist_size);
		out += str;

#ifndef TORRENT_DISABLE_DHT
		if (show_dht_status)
		{
			snprintf(str, sizeof(str), "DHT nodes: %d DHT cached nodes: %d "
				"total DHT size: %"PRId64" total observers: %d\n"
				, sess_stat.dht_nodes, sess_stat.dht_node_cache, sess_stat.dht_global_nodes
				, sess_stat.dht_total_allocations);
			out += str;

			int bucket = 0;
			for (std::vector<dht_routing_bucket>::iterator i = sess_stat.dht_routing_table.begin()
				, end(sess_stat.dht_routing_table.end()); i != end; ++i, ++bucket)
			{
				snprintf(str, sizeof(str)
					, "%3d [%2d, %2d] active: %d\n"
					, bucket, i->num_nodes, i->num_replacements, i->last_active);
				out += str;
			}

			for (std::vector<dht_lookup>::iterator i = sess_stat.active_requests.begin()
				, end(sess_stat.active_requests.end()); i != end; ++i)
			{
				snprintf(str, sizeof(str)
					, "  %10s [limit: %2d] "
					"in-flight: %-2d "
					"left: %-3d "
					"1st-timeout: %-2d "
					"timeouts: %-2d "
					"responses: %-2d "
					"last_sent: %-2d\n"
					, i->type
					, i->branch_factor
					, i->outstanding_requests
					, i->nodes_left
					, i->first_timeout
					, i->timeouts
					, i->responses
					, i->last_sent);
				out += str;
			}
		}
#endif

		if (print_utp_stats)
		{
			snprintf(str, sizeof(str), "uTP idle: %d syn: %d est: %d fin: %d wait: %d\n"
				, sess_stat.utp_stats.num_idle, sess_stat.utp_stats.num_syn_sent
				, sess_stat.utp_stats.num_connected, sess_stat.utp_stats.num_fin_sent
				, sess_stat.utp_stats.num_close_wait);
			out += str;
		}

		torrent_status const* st = 0;
		if (!filtered_handles.empty()) st = &get_active_torrent(filtered_handles);
		if (st && st->handle.is_valid())
		{
			torrent_handle h = st->handle;
			torrent_status const& s = *st;

			if ((print_downloads && s.state != torrent_status::seeding)
				|| print_peers)
				h.get_peer_info(peers);

			out += "====== ";
			out += st->name;
			out += " ======\n";

			if (print_peers && !peers.empty())
				print_peer_info(out, peers);

			if (print_trackers)
			{
				std::vector<announce_entry> tr = h.trackers();
				ptime now = time_now();
				for (std::vector<announce_entry>::iterator i = tr.begin()
					, end(tr.end()); i != end; ++i)
				{
					snprintf(str, sizeof(str), "%2d %-55s fails: %-3d (%-3d) %s %s %5d \"%s\" %s\n"
						, i->tier, i->url.c_str(), i->fails, i->fail_limit, i->verified?"OK ":"-  "
						, i->updating?"updating"
							:!i->will_announce(now)?""
							:to_string(total_seconds(i->next_announce - now), 8).c_str()
						, i->min_announce > now ? total_seconds(i->min_announce - now) : 0
						, i->last_error ? i->last_error.message().c_str() : ""
						, i->message.c_str());
					out += str;
				}
			}

			if (print_downloads)
			{
				std::vector<cached_piece_info> pieces;
				ses.get_cache_info(h.info_hash(), pieces);

				h.get_download_queue(queue);

				std::sort(queue.begin(), queue.end(), boost::bind(&partial_piece_info::piece_index, _1)
					< boost::bind(&partial_piece_info::piece_index, _2));

				std::sort(pieces.begin(), pieces.end(), boost::bind(&cached_piece_info::last_use, _1)
					> boost::bind(&cached_piece_info::last_use, _2));

				for (std::vector<cached_piece_info>::iterator i = pieces.begin();
					i != pieces.end(); ++i)
				{
					partial_piece_info* pp = 0;
					partial_piece_info tmp;
					tmp.piece_index = i->piece;
					std::vector<partial_piece_info>::iterator ppi
						= std::lower_bound(queue.begin(), queue.end(), tmp
						, boost::bind(&partial_piece_info::piece_index, _1)
						< boost::bind(&partial_piece_info::piece_index, _2));
					if (ppi != queue.end() && ppi->piece_index == i->piece) pp = &*ppi;

					print_piece(pp, &*i, peers, out);

					if (pp) queue.erase(ppi);
				}

				for (std::vector<partial_piece_info>::iterator i = queue.begin()
					, end(queue.end()); i != end; ++i)
				{
					print_piece(&*i, 0, peers, out);
				}
				snprintf(str, sizeof(str), "%s %s: read cache %s %s: downloading %s %s: cached %s %s: flushed\n"
					, esc("34;7"), esc("0") // read cache
					, esc("33;7"), esc("0") // downloading
					, esc("36;7"), esc("0") // cached
					, esc("32;7"), esc("0")); // flushed
				out += str;
				out += "___________________________________\n";
			}

			if (print_file_progress
				&& s.state != torrent_status::seeding
				&& s.has_metadata)
			{
				std::vector<size_type> file_progress;
				h.file_progress(file_progress);
				boost::intrusive_ptr<torrent_info> ti = h.torrent_file();
				for (int i = 0; i < ti->num_files(); ++i)
				{
					bool pad_file = ti->file_at(i).pad_file;
					if (!show_pad_files && pad_file) continue;
					int progress = ti->file_at(i).size > 0
						?file_progress[i] * 1000 / ti->file_at(i).size:1000;

					char const* color = (file_progress[i] == ti->file_at(i).size)
						?"32":"33";

					snprintf(str, sizeof(str), "%s %s %-5.2f%% %s %s%s\n",
						progress_bar(progress, 100, color).c_str()
						, pad_file?esc("34"):""
						, progress / 10.f
						, add_suffix(file_progress[i]).c_str()
						, ti->files().file_name(i).c_str()
						, pad_file?esc("0"):"");
					out += str;
				}

				out += "___________________________________\n";
			}

		}

		if (print_log)
		{
			for (std::deque<std::string>::iterator i = events.begin();
				i != events.end(); ++i)
			{
				out += "\n";
				out += *i;
			}
		}

		clear_home();
		puts(out.c_str());
		fflush(stdout);

		if (!monitor_dir.empty()
			&& next_dir_scan < time_now())
		{
			scan_dir(monitor_dir, ses, files, non_files
				, allocation_mode, save_path, torrent_upload_limit
				, torrent_download_limit);
			next_dir_scan = time_now() + seconds(poll_interval);
		}
	}

	// keep track of the number of resume data
	// alerts to wait for
	int num_paused = 0;
	int num_failed = 0;

	ses.pause();
	printf("saving resume data\n");
	std::vector<torrent_status> temp;
 	ses.get_torrent_status(&temp, &yes, 0);
	for (std::vector<torrent_status>::iterator i = temp.begin();
		i != temp.end(); ++i)
	{
		torrent_status& st = *i;
		if (!st.handle.is_valid())
		{
			printf("  skipping, invalid handle\n");
			continue;
		}
		if (!st.has_metadata)
		{
			printf("  skipping %s, no metadata\n", st.name.c_str());
			continue;
		}
		if (!st.need_save_resume)
		{
			printf("  skipping %s, resume file up-to-date\n", st.name.c_str());
			continue;
		}

		// save_resume_data will generate an alert when it's done
		st.handle.save_resume_data();
		++num_outstanding_resume_data;
		printf("\r%d  ", num_outstanding_resume_data);
	}
	printf("\nwaiting for resume data [%d]\n", num_outstanding_resume_data);

	while (num_outstanding_resume_data > 0)
	{
		alert const* a = ses.wait_for_alert(seconds(10));
		if (a == 0) continue;

		std::deque<alert*> alerts;
		ses.pop_alerts(&alerts);
		std::string now = time_now_string();
		for (std::deque<alert*>::iterator i = alerts.begin()
			, end(alerts.end()); i != end; ++i)
		{
			// make sure to delete each alert
			std::auto_ptr<alert> a(*i);

			torrent_paused_alert const* tp = alert_cast<torrent_paused_alert>(*i);
			if (tp)
			{
				++num_paused;
				printf("\rleft: %d failed: %d pause: %d "
					, num_outstanding_resume_data, num_failed, num_paused);
				continue;
			}

			if (alert_cast<save_resume_data_failed_alert>(*i))
			{
				++num_failed;
				--num_outstanding_resume_data;
				printf("\rleft: %d failed: %d pause: %d "
					, num_outstanding_resume_data, num_failed, num_paused);
				continue;
			}

			save_resume_data_alert const* rd = alert_cast<save_resume_data_alert>(*i);
			if (!rd) continue;
			--num_outstanding_resume_data;
			printf("\rleft: %d failed: %d pause: %d "
				, num_outstanding_resume_data, num_failed, num_paused);

			if (!rd->resume_data) continue;

			torrent_handle h = rd->handle;
			torrent_status st = h.status(torrent_handle::query_save_path);
			std::vector<char> out;
			bencode(std::back_inserter(out), *rd->resume_data);
			save_file(combine_path(st.save_path, combine_path(".resume", to_hex(st.info_hash.to_string()) + ".resume")), out);
		}
	}

	if (g_log_file) fclose(g_log_file);
	printf("\nsaving session state\n");
	{
		entry session_state;
		ses.save_state(session_state);

		std::vector<char> out;
		bencode(std::back_inserter(out), session_state);
		save_file(".ses_state", out);
	}

	printf("closing session");

	return 0;
}