summaryrefslogtreecommitdiff
path: root/src/configparser.cpp
blob: 0102c910c3bf21c72276d04acb2dc3baa25c50ad (plain)
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
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2018 linuxdaemon <linuxdaemon.irc@gmail.com>
 *   Copyright (C) 2013-2014, 2016-2020 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2013 ChrisTX <xpipe@hotmail.de>
 *   Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
 *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
 *   Copyright (C) 2010 Craig Edwards <brain@inspircd.org>
 *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
 *
 * This file is part of InspIRCd.  InspIRCd 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, version 2.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"
#include <fstream>
#include "configparser.h"

enum ParseFlags
{
	// Legacy config parsing should be used.
	FLAG_USE_COMPAT = 1,

	// Executable includes are disabled.
	FLAG_NO_EXEC = 2,

	// All includes are disabled.
	FLAG_NO_INC = 4
};

// Represents the position within a config file.
struct FilePosition
{
	// The name of the file which is being read.
	std::string name;

	// The line of the file that this position points to.
	unsigned int line;

	// The column of the file that this position points to.
	unsigned int column;

	FilePosition(const std::string& Name)
		: name(Name)
		, line(1)
		, column(1)
	{
	}

	/** Returns a string that represents this file position. */
	std::string str()
	{
		return name + ":" + ConvToStr(line) + ":" + ConvToStr(column);
	}
};

// RAII wrapper for FILE* which closes the file when it goes out of scope.
class FileWrapper
{
 private:
	// Whether this file handle should be closed with pclose.
	bool close_with_pclose;

	// The file handle which is being wrapped.
	FILE* const file;

 public:
	FileWrapper(FILE* File, bool CloseWithPClose = false)
		: close_with_pclose(CloseWithPClose)
		, file(File)
	{
	}

	// Operator which determines whether the file is open.
	operator bool() { return (file != NULL); }

	// Operator which retrieves the underlying FILE pointer.
	operator FILE*() { return file; }

	~FileWrapper()
	{
		if (!file)
			return;

		if (close_with_pclose)
			pclose(file);
		else
			fclose(file);
	}
};


struct Parser
{
	ParseStack& stack;
	int flags;
	FILE* const file;
	FilePosition current;
	FilePosition last_tag;
	reference<ConfigTag> tag;
	int ungot;
	std::string mandatory_tag;

	Parser(ParseStack& me, int myflags, FILE* conf, const std::string& name, const std::string& mandatorytag)
		: stack(me), flags(myflags), file(conf), current(name), last_tag(name), ungot(-1), mandatory_tag(mandatorytag)
	{ }

	int next(bool eof_ok = false)
	{
		if (ungot != -1)
		{
			int ch = ungot;
			ungot = -1;
			return ch;
		}
		int ch = fgetc(file);
		if (ch == EOF && !eof_ok)
		{
			throw CoreException("Unexpected end-of-file");
		}
		else if (ch == '\n')
		{
			current.line++;
			current.column = 0;
		}
		else
		{
			current.column++;
		}
		return ch;
	}

	void unget(int ch)
	{
		if (ungot != -1)
			throw CoreException("INTERNAL ERROR: cannot unget twice");
		ungot = ch;
	}

	void comment()
	{
		while (1)
		{
			int ch = next();
			if (ch == '\n')
				return;
		}
	}

	void nextword(std::string& rv)
	{
		int ch = next();
		while (isspace(ch))
			ch = next();
		while (isalnum(ch) || ch == '_'|| ch == '-')
		{
			rv.push_back(ch);
			ch = next();
		}
		unget(ch);
	}

	bool kv(ConfigItems* items)
	{
		std::string key;
		nextword(key);
		int ch = next();
		if (ch == '>' && key.empty())
		{
			return false;
		}
		else if (ch == '#' && key.empty())
		{
			comment();
			return true;
		}
		else if (ch != '=')
		{
			throw CoreException("Invalid character " + std::string(1, ch) + " in key (" + key + ")");
		}

		std::string value;
		ch = next();
		if (ch != '"')
		{
			throw CoreException("Invalid character in value of <" + tag->tag + ":" + key + ">");
		}
		while (1)
		{
			ch = next();
			if (ch == '&' && !(flags & FLAG_USE_COMPAT))
			{
				std::string varname;
				while (1)
				{
					ch = next();
					if (isalnum(ch) || (varname.empty() && ch == '#'))
						varname.push_back(ch);
					else if (ch == ';')
						break;
					else
					{
						stack.errstr << "Invalid XML entity name in value of <" + tag->tag + ":" + key + ">\n"
							<< "To include an ampersand or quote, use &amp; or &quot;\n";
						throw CoreException("Parse error");
					}
				}
				if (varname.empty())
					throw CoreException("Empty XML entity reference");
				else if (varname[0] == '#' && (varname.size() == 1 || (varname.size() == 2 && varname[1] == 'x')))
					throw CoreException("Empty numeric character reference");
				else if (varname[0] == '#')
				{
					const char* cvarname = varname.c_str();
					char* endptr;
					unsigned long lvalue;
					if (cvarname[1] == 'x')
						lvalue = strtoul(cvarname + 2, &endptr, 16);
					else
						lvalue = strtoul(cvarname + 1, &endptr, 10);
					if (*endptr != '\0' || lvalue > 255)
						throw CoreException("Invalid numeric character reference '&" + varname + ";'");
					value.push_back(static_cast<char>(lvalue));
				}
				else
				{
					insp::flat_map<std::string, std::string>::iterator var = stack.vars.find(varname);
					if (var == stack.vars.end())
						throw CoreException("Undefined XML entity reference '&" + varname + ";'");
					value.append(var->second);
				}
			}
			else if (ch == '\\' && (flags & FLAG_USE_COMPAT))
			{
				int esc = next();
				if (esc == 'n')
					value.push_back('\n');
				else if (isalpha(esc))
					throw CoreException("Unknown escape character \\" + std::string(1, esc));
				else
					value.push_back(esc);
			}
			else if (ch == '"')
				break;
			else if (ch != '\r')
				value.push_back(ch);
		}

		if (items->find(key) != items->end())
			throw CoreException("Duplicate key '" + key + "' found");

		(*items)[key] = value;
		return true;
	}

	void dotag()
	{
		last_tag = current;
		std::string name;
		nextword(name);

		int spc = next();
		if (spc == '>')
			unget(spc);
		else if (!isspace(spc))
			throw CoreException("Invalid character in tag name");

		if (name.empty())
			throw CoreException("Empty tag name");

		ConfigItems* items;
		tag = ConfigTag::create(name, current.name, current.line, items);

		while (kv(items))
		{
			// Do nothing here (silences a GCC warning).
		}

		if (name == mandatory_tag)
		{
			// Found the mandatory tag
			mandatory_tag.clear();
		}

		if (stdalgo::string::equalsci(name, "include"))
		{
			stack.DoInclude(tag, flags);
		}
		else if (stdalgo::string::equalsci(name, "files"))
		{
			for(ConfigItems::iterator i = items->begin(); i != items->end(); i++)
			{
				stack.DoReadFile(i->first, i->second, flags, false);
			}
		}
		else if (stdalgo::string::equalsci(name, "execfiles"))
		{
			for(ConfigItems::iterator i = items->begin(); i != items->end(); i++)
			{
				stack.DoReadFile(i->first, i->second, flags, true);
			}
		}
		else if (stdalgo::string::equalsci(name, "define"))
		{
			if (flags & FLAG_USE_COMPAT)
				throw CoreException("<define> tags may only be used in XML-style config (add <config format=\"xml\">)");
			std::string varname = tag->getString("name");
			std::string value = tag->getString("value");
			if (varname.empty())
				throw CoreException("Variable definition must include variable name");
			stack.vars[varname] = value;
		}
		else if (stdalgo::string::equalsci(name, "config"))
		{
			std::string format = tag->getString("format");
			if (stdalgo::string::equalsci(format, "xml"))
				flags &= ~FLAG_USE_COMPAT;
			else if (stdalgo::string::equalsci(format, "compat"))
				flags |= FLAG_USE_COMPAT;
			else if (!format.empty())
				throw CoreException("Unknown configuration format " + format);
		}
		else
		{
			stack.output.insert(std::make_pair(name, tag));
		}
		// this is not a leak; reference<> takes care of the delete
		tag = NULL;
	}

	bool outer_parse()
	{
		try
		{
			while (1)
			{
				int ch = next(true);
				switch (ch)
				{
					case EOF:
						// this is the one place where an EOF is not an error
						if (!mandatory_tag.empty())
							throw CoreException("Mandatory tag \"" + mandatory_tag + "\" not found");
						return true;
					case '#':
						comment();
						break;
					case '<':
						dotag();
						break;
					case ' ':
					case '\r':
					case '\t':
					case '\n':
						break;
					case 0xFE:
					case 0xFF:
						stack.errstr << "Do not save your files as UTF-16 or UTF-32, use UTF-8!\n";
						/*@fallthrough@*/
					default:
						throw CoreException("Syntax error - start of tag expected");
				}
			}
		}
		catch (CoreException& err)
		{
			stack.errstr << err.GetReason() << " at " << current.str();
			if (tag)
				stack.errstr << " (inside tag " << tag->tag << " at line " << tag->src_line << ")\n";
			else
				stack.errstr << " (last tag was on line " << last_tag.line << ")\n";
		}
		return false;
	}
};

void ParseStack::DoInclude(ConfigTag* tag, int flags)
{
	if (flags & FLAG_NO_INC)
		throw CoreException("Invalid <include> tag in file included with noinclude=\"yes\"");

	std::string mandatorytag;
	tag->readString("mandatorytag", mandatorytag);

	std::string name;
	if (tag->readString("file", name))
	{
		if (tag->getBool("noinclude", false))
			flags |= FLAG_NO_INC;
		if (tag->getBool("noexec", false))
			flags |= FLAG_NO_EXEC;

		if (!ParseFile(ServerInstance->Config->Paths.PrependConfig(name), flags, mandatorytag))
			throw CoreException("Included");
	}
	else if (tag->readString("directory", name))
	{
		if (tag->getBool("noinclude", false))
			flags |= FLAG_NO_INC;
		if (tag->getBool("noexec", false))
			flags |= FLAG_NO_EXEC;

		const std::string includedir = ServerInstance->Config->Paths.PrependConfig(name);
		std::vector<std::string> files;
		if (!FileSystem::GetFileList(includedir, files, "*.conf"))
			throw CoreException("Unable to read directory for include: " + includedir);

		std::sort(files.begin(), files.end()); 
		for (std::vector<std::string>::const_iterator iter = files.begin(); iter != files.end(); ++iter)
		{
			const std::string path = includedir + '/' + *iter;
			if (!ParseFile(path, flags, mandatorytag))
				throw CoreException("Included");
		}
	}
	else if (tag->readString("executable", name))
	{
		if (flags & FLAG_NO_EXEC)
			throw CoreException("Invalid <include:executable> tag in file included with noexec=\"yes\"");
		if (tag->getBool("noinclude", false))
			flags |= FLAG_NO_INC;
		if (tag->getBool("noexec", true))
			flags |= FLAG_NO_EXEC;

		if (!ParseFile(name, flags, mandatorytag, true))
			throw CoreException("Included");
	}
}

void ParseStack::DoReadFile(const std::string& key, const std::string& name, int flags, bool exec)
{
	if (flags & FLAG_NO_INC)
		throw CoreException("Invalid <files> tag in file included with noinclude=\"yes\"");
	if (exec && (flags & FLAG_NO_EXEC))
		throw CoreException("Invalid <execfiles> tag in file included with noexec=\"yes\"");

	std::string path = ServerInstance->Config->Paths.PrependConfig(name);
	FileWrapper file(exec ? popen(name.c_str(), "r") : fopen(path.c_str(), "r"), exec);
	if (!file)
		throw CoreException("Could not read \"" + path + "\" for \"" + key + "\" file");

	file_cache& cache = FilesOutput[key];
	cache.clear();

	char linebuf[5120];
	while (fgets(linebuf, sizeof(linebuf), file))
	{
		size_t len = strlen(linebuf);
		if (len)
		{
			if (linebuf[len-1] == '\n')
				len--;
			cache.push_back(std::string(linebuf, len));
		}
	}
}

bool ParseStack::ParseFile(const std::string& path, int flags, const std::string& mandatory_tag, bool isexec)
{
	ServerInstance->Logs->Log("CONFIG", LOG_DEBUG, "Reading (isexec=%d) %s", isexec, path.c_str());
	if (stdalgo::isin(reading, path))
		throw CoreException((isexec ? "Executable " : "File ") + path + " is included recursively (looped inclusion)");

	/* It's not already included, add it to the list of files we've loaded */

	FileWrapper file((isexec ? popen(path.c_str(), "r") : fopen(path.c_str(), "r")), isexec);
	if (!file)
		throw CoreException("Could not read \"" + path + "\" for include");

	reading.push_back(path);
	Parser p(*this, flags, file, path, mandatory_tag);
	bool ok = p.outer_parse();
	reading.pop_back();
	return ok;
}

bool ConfigTag::readString(const std::string& key, std::string& value, bool allow_lf)
{
	for(ConfigItems::iterator j = items.begin(); j != items.end(); ++j)
	{
		if(j->first != key)
			continue;
		value = j->second;
 		if (!allow_lf && (value.find('\n') != std::string::npos))
		{
			ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "Value of <" + tag + ":" + key + "> at " + getTagLocation() +
				" contains a linefeed, and linefeeds in this value are not permitted -- stripped to spaces.");
			for (std::string::iterator n = value.begin(); n != value.end(); n++)
				if (*n == '\n')
					*n = ' ';
		}
		return true;
	}
	return false;
}

std::string ConfigTag::getString(const std::string& key, const std::string& def, const TR1NS::function<bool(const std::string&)>& validator)
{
	std::string res;
	if (!readString(key, res))
		return def;

	if (!validator(res))
	{
		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "WARNING: The value of <%s:%s> is not valid; value set to %s.",
			tag.c_str(), key.c_str(), def.c_str());
		return def;
	}
	return res;
}

std::string ConfigTag::getString(const std::string& key, const std::string& def, size_t minlen, size_t maxlen)
{
	std::string res;
	if (!readString(key, res))
		return def;

	if (res.length() < minlen || res.length() > maxlen)
	{
		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "WARNING: The length of <%s:%s> is not between %ld and %ld; value set to %s.",
			tag.c_str(), key.c_str(), minlen, maxlen, def.c_str());
		return def;
	}
	return res;
}

namespace
{
	/** Check for an invalid magnitude specifier. If one is found a warning is logged and the
	 * value is corrected (set to \p def).
	 * @param tag The tag name; used in the warning message.
	 * @param key The key name; used in the warning message.
	 * @param val The full value set in the config as a string.
	 * @param num The value to verify and modify if needed.
	 * @param def The default value, \p res will be set to this if \p tail does not contain a.
	 *            valid magnitude specifier.
	 * @param tail The location in the config value at which the magnifier is located.
	 */
	template <typename Numeric>
	void CheckMagnitude(const std::string& tag, const std::string& key, const std::string& val, Numeric& num, Numeric def, const char* tail)
	{
		// If this is NULL then no magnitude specifier was given.
		if (!*tail)
			return;

		switch (toupper(*tail))
		{
			case 'K':
				num *= 1024;
				return;

			case 'M':
				num *= 1024 * 1024;
				return;

			case 'G':
				num *= 1024 * 1024 * 1024;
				return;
		}

		const std::string message = "WARNING: <" + tag + ":" + key + "> value of " + val + " contains an invalid magnitude specifier '"
			+ tail + "'; value set to " + ConvToStr(def) + ".";
		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, message);
		num = def;
	}

	/** Check for an out of range value. If the value falls outside the boundaries a warning is
	 * logged and the value is corrected (set to \p def).
	 * @param tag The tag name; used in the warning message.
	 * @param key The key name; used in the warning message.
	 * @param num The value to verify and modify if needed.
	 * @param def The default value, \p res will be set to this if (min <= res <= max) doesn't hold true.
	 * @param min Minimum accepted value for \p res.
	 * @param max Maximum accepted value for \p res.
	 */
	template <typename Numeric>
	void CheckRange(const std::string& tag, const std::string& key, Numeric& num, Numeric def, Numeric min, Numeric max)
	{
		if (num >= min && num <= max)
			return;

		const std::string message = "WARNING: <" + tag + ":" + key + "> value of " + ConvToStr(num) + " is not between "
			+ ConvToStr(min) + " and " + ConvToStr(max) + "; value set to " + ConvToStr(def) + ".";
		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, message);
		num = def;
	}
}

long ConfigTag::getInt(const std::string &key, long def, long min, long max)
{
	std::string result;
	if(!readString(key, result))
		return def;

	const char* res_cstr = result.c_str();
	char* res_tail = NULL;
	long res = strtol(res_cstr, &res_tail, 0);
	if (res_tail == res_cstr)
		return def;

	CheckMagnitude(tag, key, result, res, def, res_tail);
	CheckRange(tag, key, res, def, min, max);
	return res;
}

unsigned long ConfigTag::getUInt(const std::string& key, unsigned long def, unsigned long min, unsigned long max)
{
	std::string result;
	if (!readString(key, result))
		return def;

	const char* res_cstr = result.c_str();
	char* res_tail = NULL;
	unsigned long res = strtoul(res_cstr, &res_tail, 0);
	if (res_tail == res_cstr)
		return def;

	CheckMagnitude(tag, key, result, res, def, res_tail);
	CheckRange(tag, key, res, def, min, max);
	return res;
}

unsigned long ConfigTag::getDuration(const std::string& key, unsigned long def, unsigned long min, unsigned long max)
{
	std::string duration;
	if (!readString(key, duration))
		return def;

	unsigned long ret;
	if (!InspIRCd::Duration(duration, ret))
	{
		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "Value of <" + tag + ":" + key + "> at " + getTagLocation() +
			" is not a duration; value set to " + ConvToStr(def) + ".");
		return def;
	}

	CheckRange(tag, key, ret, def, min, max);
	return ret;
}

double ConfigTag::getFloat(const std::string& key, double def, double min, double max)
{
	std::string result;
	if (!readString(key, result))
		return def;

	double res = strtod(result.c_str(), NULL);
	CheckRange(tag, key, res, def, min, max);
	return res;
}

bool ConfigTag::getBool(const std::string &key, bool def)
{
	std::string result;
	if(!readString(key, result))
		return def;

	if (stdalgo::string::equalsci(result, "yes") || stdalgo::string::equalsci(result, "true") || stdalgo::string::equalsci(result, "on") || result == "1")
		return true;

	if (stdalgo::string::equalsci(result, "no") || stdalgo::string::equalsci(result, "false") || stdalgo::string::equalsci(result, "off") || result == "0")
		return false;

	ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "Value of <" + tag + ":" + key + "> at " + getTagLocation() +
		" is not valid, ignoring");
	return def;
}

std::string ConfigTag::getTagLocation()
{
	return src_name + ":" + ConvToStr(src_line);
}

ConfigTag* ConfigTag::create(const std::string& Tag, const std::string& file, int line, ConfigItems*& Items)
{
	ConfigTag* rv = new ConfigTag(Tag, file, line);
	Items = &rv->items;
	return rv;
}

ConfigTag::ConfigTag(const std::string& Tag, const std::string& file, int line)
	: tag(Tag), src_name(file), src_line(line)
{
}

OperInfo::OperInfo(const std::string& Name)
	: name(Name)
{
}

std::string OperInfo::getConfig(const std::string& key)
{
	std::string rv;
	if (type_block)
		type_block->readString(key, rv);
	if (oper_block)
		oper_block->readString(key, rv);
	return rv;
}