aboutsummaryrefslogtreecommitdiffstats
path: root/src/command/AllCommands.cxx
blob: 9f0b0a6062b83c9944988c01ac9cc96d276680c9 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
/*
 * Copyright (C) 2003-2015 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "AllCommands.hxx"
#include "Request.hxx"
#include "QueueCommands.hxx"
#include "TagCommands.hxx"
#include "PlayerCommands.hxx"
#include "PlaylistCommands.hxx"
#include "StorageCommands.hxx"
#include "DatabaseCommands.hxx"
#include "FileCommands.hxx"
#include "OutputCommands.hxx"
#include "MessageCommands.hxx"
#include "NeighborCommands.hxx"
#include "OtherCommands.hxx"
#include "Permission.hxx"
#include "tag/TagType.h"
#include "protocol/Result.hxx"
#include "Partition.hxx"
#include "client/Client.hxx"
#include "util/Macros.hxx"
#include "util/Tokenizer.hxx"
#include "util/Error.hxx"
#include "util/ConstBuffer.hxx"

#ifdef ENABLE_SQLITE
#include "StickerCommands.hxx"
#include "sticker/StickerDatabase.hxx"
#endif

#include <assert.h>
#include <string.h>

/*
 * The most we ever use is for search/find, and that limits it to the
 * number of tags we can have.  Add one for the command, and one extra
 * to catch errors clients may send us
 */
#define COMMAND_ARGV_MAX	(2+(TAG_NUM_OF_ITEM_TYPES*2))

/* if min: -1 don't check args *
 * if max: -1 no max args      */
struct command {
	const char *cmd;
	unsigned permission;
	int min;
	int max;
	CommandResult (*handler)(Client &client, Request args);
};

/* don't be fooled, this is the command handler for "commands" command */
static CommandResult
handle_commands(Client &client, Request args);

static CommandResult
handle_not_commands(Client &client, Request args);

/**
 * The command registry.
 *
 * This array must be sorted!
 */
static constexpr struct command commands[] = {
	{ "add", PERMISSION_ADD, 1, 1, handle_add },
	{ "addid", PERMISSION_ADD, 1, 2, handle_addid },
	{ "addtagid", PERMISSION_ADD, 3, 3, handle_addtagid },
	{ "channels", PERMISSION_READ, 0, 0, handle_channels },
	{ "clear", PERMISSION_CONTROL, 0, 0, handle_clear },
	{ "clearerror", PERMISSION_CONTROL, 0, 0, handle_clearerror },
	{ "cleartagid", PERMISSION_ADD, 1, 2, handle_cleartagid },
	{ "close", PERMISSION_NONE, -1, -1, handle_close },
	{ "commands", PERMISSION_NONE, 0, 0, handle_commands },
	{ "config", PERMISSION_ADMIN, 0, 0, handle_config },
	{ "consume", PERMISSION_CONTROL, 1, 1, handle_consume },
#ifdef ENABLE_DATABASE
	{ "count", PERMISSION_READ, 2, -1, handle_count },
#endif
	{ "crossfade", PERMISSION_CONTROL, 1, 1, handle_crossfade },
	{ "currentsong", PERMISSION_READ, 0, 0, handle_currentsong },
	{ "decoders", PERMISSION_READ, 0, 0, handle_decoders },
	{ "delete", PERMISSION_CONTROL, 1, 1, handle_delete },
	{ "deleteid", PERMISSION_CONTROL, 1, 1, handle_deleteid },
	{ "disableoutput", PERMISSION_ADMIN, 1, 1, handle_disableoutput },
	{ "enableoutput", PERMISSION_ADMIN, 1, 1, handle_enableoutput },
#ifdef ENABLE_DATABASE
	{ "find", PERMISSION_READ, 2, -1, handle_find },
	{ "findadd", PERMISSION_ADD, 2, -1, handle_findadd},
#endif
	{ "idle", PERMISSION_READ, 0, -1, handle_idle },
	{ "kill", PERMISSION_ADMIN, -1, -1, handle_kill },
#ifdef ENABLE_DATABASE
	{ "list", PERMISSION_READ, 1, -1, handle_list },
	{ "listall", PERMISSION_READ, 0, 1, handle_listall },
	{ "listallinfo", PERMISSION_READ, 0, 1, handle_listallinfo },
#endif
	{ "listfiles", PERMISSION_READ, 0, 1, handle_listfiles },
#ifdef ENABLE_DATABASE
	{ "listmounts", PERMISSION_READ, 0, 0, handle_listmounts },
#endif
#ifdef ENABLE_NEIGHBOR_PLUGINS
	{ "listneighbors", PERMISSION_READ, 0, 0, handle_listneighbors },
#endif
	{ "listplaylist", PERMISSION_READ, 1, 1, handle_listplaylist },
	{ "listplaylistinfo", PERMISSION_READ, 1, 1, handle_listplaylistinfo },
	{ "listplaylists", PERMISSION_READ, 0, 0, handle_listplaylists },
	{ "load", PERMISSION_ADD, 1, 2, handle_load },
	{ "lsinfo", PERMISSION_READ, 0, 1, handle_lsinfo },
	{ "mixrampdb", PERMISSION_CONTROL, 1, 1, handle_mixrampdb },
	{ "mixrampdelay", PERMISSION_CONTROL, 1, 1, handle_mixrampdelay },
#ifdef ENABLE_DATABASE
	{ "mount", PERMISSION_ADMIN, 2, 2, handle_mount },
#endif
	{ "move", PERMISSION_CONTROL, 2, 2, handle_move },
	{ "moveid", PERMISSION_CONTROL, 2, 2, handle_moveid },
	{ "next", PERMISSION_CONTROL, 0, 0, handle_next },
	{ "notcommands", PERMISSION_NONE, 0, 0, handle_not_commands },
	{ "outputs", PERMISSION_READ, 0, 0, handle_devices },
	{ "password", PERMISSION_NONE, 1, 1, handle_password },
	{ "pause", PERMISSION_CONTROL, 0, 1, handle_pause },
	{ "ping", PERMISSION_NONE, 0, 0, handle_ping },
	{ "play", PERMISSION_CONTROL, 0, 1, handle_play },
	{ "playid", PERMISSION_CONTROL, 0, 1, handle_playid },
	{ "playlist", PERMISSION_READ, 0, 0, handle_playlist },
	{ "playlistadd", PERMISSION_CONTROL, 2, 2, handle_playlistadd },
	{ "playlistclear", PERMISSION_CONTROL, 1, 1, handle_playlistclear },
	{ "playlistdelete", PERMISSION_CONTROL, 2, 2, handle_playlistdelete },
	{ "playlistfind", PERMISSION_READ, 2, -1, handle_playlistfind },
	{ "playlistid", PERMISSION_READ, 0, 1, handle_playlistid },
	{ "playlistinfo", PERMISSION_READ, 0, 1, handle_playlistinfo },
	{ "playlistmove", PERMISSION_CONTROL, 3, 3, handle_playlistmove },
	{ "playlistsearch", PERMISSION_READ, 2, -1, handle_playlistsearch },
	{ "plchanges", PERMISSION_READ, 1, 1, handle_plchanges },
	{ "plchangesposid", PERMISSION_READ, 1, 1, handle_plchangesposid },
	{ "previous", PERMISSION_CONTROL, 0, 0, handle_previous },
	{ "prio", PERMISSION_CONTROL, 2, -1, handle_prio },
	{ "prioid", PERMISSION_CONTROL, 2, -1, handle_prioid },
	{ "random", PERMISSION_CONTROL, 1, 1, handle_random },
	{ "rangeid", PERMISSION_ADD, 2, 2, handle_rangeid },
	{ "readcomments", PERMISSION_READ, 1, 1, handle_read_comments },
	{ "readmessages", PERMISSION_READ, 0, 0, handle_read_messages },
	{ "rename", PERMISSION_CONTROL, 2, 2, handle_rename },
	{ "repeat", PERMISSION_CONTROL, 1, 1, handle_repeat },
	{ "replay_gain_mode", PERMISSION_CONTROL, 1, 1,
	  handle_replay_gain_mode },
	{ "replay_gain_status", PERMISSION_READ, 0, 0,
	  handle_replay_gain_status },
	{ "rescan", PERMISSION_CONTROL, 0, 1, handle_rescan },
	{ "rm", PERMISSION_CONTROL, 1, 1, handle_rm },
	{ "save", PERMISSION_CONTROL, 1, 1, handle_save },
#ifdef ENABLE_DATABASE
	{ "search", PERMISSION_READ, 2, -1, handle_search },
	{ "searchadd", PERMISSION_ADD, 2, -1, handle_searchadd },
	{ "searchaddpl", PERMISSION_CONTROL, 3, -1, handle_searchaddpl },
#endif
	{ "seek", PERMISSION_CONTROL, 2, 2, handle_seek },
	{ "seekcur", PERMISSION_CONTROL, 1, 1, handle_seekcur },
	{ "seekid", PERMISSION_CONTROL, 2, 2, handle_seekid },
	{ "sendmessage", PERMISSION_CONTROL, 2, 2, handle_send_message },
	{ "setvol", PERMISSION_CONTROL, 1, 1, handle_setvol },
	{ "shuffle", PERMISSION_CONTROL, 0, 1, handle_shuffle },
	{ "single", PERMISSION_CONTROL, 1, 1, handle_single },
	{ "stats", PERMISSION_READ, 0, 0, handle_stats },
	{ "status", PERMISSION_READ, 0, 0, handle_status },
#ifdef ENABLE_SQLITE
	{ "sticker", PERMISSION_ADMIN, 3, -1, handle_sticker },
#endif
	{ "stop", PERMISSION_CONTROL, 0, 0, handle_stop },
	{ "subscribe", PERMISSION_READ, 1, 1, handle_subscribe },
	{ "swap", PERMISSION_CONTROL, 2, 2, handle_swap },
	{ "swapid", PERMISSION_CONTROL, 2, 2, handle_swapid },
	{ "tagtypes", PERMISSION_READ, 0, 0, handle_tagtypes },
	{ "toggleoutput", PERMISSION_ADMIN, 1, 1, handle_toggleoutput },
#ifdef ENABLE_DATABASE
	{ "unmount", PERMISSION_ADMIN, 1, 1, handle_unmount },
#endif
	{ "unsubscribe", PERMISSION_READ, 1, 1, handle_unsubscribe },
	{ "update", PERMISSION_CONTROL, 0, 1, handle_update },
	{ "urlhandlers", PERMISSION_READ, 0, 0, handle_urlhandlers },
	{ "volume", PERMISSION_CONTROL, 1, 1, handle_volume },
};

static constexpr unsigned num_commands = ARRAY_SIZE(commands);

static bool
command_available(gcc_unused const Partition &partition,
		  gcc_unused const struct command *cmd)
{
#ifdef ENABLE_SQLITE
	if (strcmp(cmd->cmd, "sticker") == 0)
		return sticker_enabled();
#endif

#ifdef ENABLE_NEIGHBOR_PLUGINS
	if (strcmp(cmd->cmd, "listneighbors") == 0)
		return neighbor_commands_available(partition.instance);
#endif

	if (strcmp(cmd->cmd, "save") == 0 ||
	    strcmp(cmd->cmd, "rm") == 0 ||
	    strcmp(cmd->cmd, "rename") == 0 ||
	    strcmp(cmd->cmd, "playlistdelete") == 0 ||
	    strcmp(cmd->cmd, "playlistmove") == 0 ||
	    strcmp(cmd->cmd, "playlistclear") == 0 ||
	    strcmp(cmd->cmd, "playlistadd") == 0 ||
	    strcmp(cmd->cmd, "listplaylists") == 0)
		return playlist_commands_available();

	return true;
}

/* don't be fooled, this is the command handler for "commands" command */
static CommandResult
handle_commands(Client &client, gcc_unused Request args)
{
	const unsigned permission = client.GetPermission();

	for (unsigned i = 0; i < num_commands; ++i) {
		const struct command *cmd = &commands[i];

		if (cmd->permission == (permission & cmd->permission) &&
		    command_available(client.partition, cmd))
			client_printf(client, "command: %s\n", cmd->cmd);
	}

	return CommandResult::OK;
}

static CommandResult
handle_not_commands(Client &client, gcc_unused Request args)
{
	const unsigned permission = client.GetPermission();

	for (unsigned i = 0; i < num_commands; ++i) {
		const struct command *cmd = &commands[i];

		if (cmd->permission != (permission & cmd->permission))
			client_printf(client, "command: %s\n", cmd->cmd);
	}

	return CommandResult::OK;
}

void
command_init()
{
#ifndef NDEBUG
	/* ensure that the command list is sorted */
	for (unsigned i = 0; i < num_commands - 1; ++i)
		assert(strcmp(commands[i].cmd, commands[i + 1].cmd) < 0);
#endif
}

void
command_finish()
{
}

static const struct command *
command_lookup(const char *name)
{
	unsigned a = 0, b = num_commands, i;

	/* binary search */
	do {
		i = (a + b) / 2;

		const auto cmp = strcmp(name, commands[i].cmd);
		if (cmp == 0)
			return &commands[i];
		else if (cmp < 0)
			b = i;
		else if (cmp > 0)
			a = i + 1;
	} while (a < b);

	return nullptr;
}

static bool
command_check_request(const struct command *cmd, Client &client,
		      unsigned permission, Request args)
{
	if (cmd->permission != (permission & cmd->permission)) {
		command_error(client, ACK_ERROR_PERMISSION,
			      "you don't have permission for \"%s\"",
			      cmd->cmd);
		return false;
	}

	const int min = cmd->min;
	const int max = cmd->max;

	if (min < 0)
		return true;

	if (min == max && unsigned(max) != args.size) {
		command_error(client, ACK_ERROR_ARG,
			      "wrong number of arguments for \"%s\"",
			      cmd->cmd);
		return false;
	} else if (args.size < unsigned(min)) {
		command_error(client, ACK_ERROR_ARG,
			      "too few arguments for \"%s\"", cmd->cmd);
		return false;
	} else if (max >= 0 && args.size > unsigned(max)) {
		command_error(client, ACK_ERROR_ARG,
			      "too many arguments for \"%s\"", cmd->cmd);
		return false;
	} else
		return true;
}

static const struct command *
command_checked_lookup(Client &client, unsigned permission,
		       const char *cmd_name, Request args)
{
	current_command = "";

	const struct command *cmd = command_lookup(cmd_name);
	if (cmd == nullptr) {
		command_error(client, ACK_ERROR_UNKNOWN,
			      "unknown command \"%s\"", cmd_name);
		return nullptr;
	}

	current_command = cmd->cmd;

	if (!command_check_request(cmd, client, permission, args))
		return nullptr;

	return cmd;
}

CommandResult
command_process(Client &client, unsigned num, char *line)
{
	Error error;

	command_list_num = num;

	/* get the command name (first word on the line) */
	/* we have to set current_command because command_error()
	   expects it to be set */

	Tokenizer tokenizer(line);

	const char *const cmd_name = current_command =
		tokenizer.NextWord(error);
	if (cmd_name == nullptr) {
		current_command = "";
		if (tokenizer.IsEnd())
			command_error(client, ACK_ERROR_UNKNOWN,
				      "No command given");
		else
			command_error(client, ACK_ERROR_UNKNOWN,
				      "%s", error.GetMessage());

		current_command = nullptr;

		/* this client does not speak the MPD protocol; kick
		   the connection */
		return CommandResult::FINISH;
	}

	char *argv[COMMAND_ARGV_MAX];
	Request args(argv, 0);

	/* now parse the arguments (quoted or unquoted) */

	while (true) {
		if (args.size == COMMAND_ARGV_MAX) {
			command_error(client, ACK_ERROR_ARG,
				      "Too many arguments");
			current_command = nullptr;
			return CommandResult::ERROR;
		}

		char *a = tokenizer.NextParam(error);
		if (a == nullptr) {
			if (tokenizer.IsEnd())
				break;

			command_error(client, ACK_ERROR_ARG, "%s", error.GetMessage());
			current_command = nullptr;
			return CommandResult::ERROR;
		}

		argv[args.size++] = a;
	}

	/* look up and invoke the command handler */

	const struct command *cmd =
		command_checked_lookup(client, client.GetPermission(),
				       cmd_name, args);

	CommandResult ret = cmd
		? cmd->handler(client, args)
		: CommandResult::ERROR;

	current_command = nullptr;
	command_list_num = 0;

	return ret;
}