summaryrefslogtreecommitdiffstats
path: root/contrib/sendmail/src/stab.c
blob: 6dacdfa4ee551695a8495cf0bd2e61cb7b44d8a9 (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
/*
 * Copyright (c) 1998-2001, 2003 Sendmail, Inc. and its suppliers.
 *	All rights reserved.
 * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

#include <sendmail.h>

SM_RCSID("@(#)$Id: stab.c,v 8.89 2006/08/15 23:24:58 ca Exp $")

/*
**  STAB -- manage the symbol table
**
**	Parameters:
**		name -- the name to be looked up or inserted.
**		type -- the type of symbol.
**		op -- what to do:
**			ST_ENTER -- enter the name if not already present.
**			ST_FIND -- find it only.
**
**	Returns:
**		pointer to a STAB entry for this name.
**		NULL if not found and not entered.
**
**	Side Effects:
**		can update the symbol table.
*/

#define STABSIZE	2003
#define SM_LOWER(c)	((isascii(c) && isupper(c)) ? tolower(c) : (c))

static STAB	*SymTab[STABSIZE];

STAB *
stab(name, type, op)
	char *name;
	int type;
	int op;
{
	register STAB *s;
	register STAB **ps;
	register int hfunc;
	register char *p;
	int len;

	if (tTd(36, 5))
		sm_dprintf("STAB: %s %d ", name, type);

	/*
	**  Compute the hashing function
	*/

	hfunc = type;
	for (p = name; *p != '\0'; p++)
		hfunc = ((hfunc << 1) ^ (SM_LOWER(*p) & 0377)) % STABSIZE;

	if (tTd(36, 9))
		sm_dprintf("(hfunc=%d) ", hfunc);

	ps = &SymTab[hfunc];
	if (type == ST_MACRO || type == ST_RULESET)
	{
		while ((s = *ps) != NULL &&
		       (s->s_symtype != type || strcmp(name, s->s_name)))
			ps = &s->s_next;
	}
	else
	{
		while ((s = *ps) != NULL &&
		       (s->s_symtype != type || sm_strcasecmp(name, s->s_name)))
			ps = &s->s_next;
	}

	/*
	**  Dispose of the entry.
	*/

	if (s != NULL || op == ST_FIND)
	{
		if (tTd(36, 5))
		{
			if (s == NULL)
				sm_dprintf("not found\n");
			else
			{
				long *lp = (long *) s->s_class;

				sm_dprintf("type %d val %lx %lx %lx %lx\n",
					s->s_symtype, lp[0], lp[1], lp[2], lp[3]);
			}
		}
		return s;
	}

	/*
	**  Make a new entry and link it in.
	*/

	if (tTd(36, 5))
		sm_dprintf("entered\n");

	/* determine size of new entry */
	switch (type)
	{
	  case ST_CLASS:
		len = sizeof(s->s_class);
		break;

	  case ST_ADDRESS:
		len = sizeof(s->s_address);
		break;

	  case ST_MAILER:
		len = sizeof(s->s_mailer);
		break;

	  case ST_ALIAS:
		len = sizeof(s->s_alias);
		break;

	  case ST_MAPCLASS:
		len = sizeof(s->s_mapclass);
		break;

	  case ST_MAP:
		len = sizeof(s->s_map);
		break;

	  case ST_HOSTSIG:
		len = sizeof(s->s_hostsig);
		break;

	  case ST_NAMECANON:
		len = sizeof(s->s_namecanon);
		break;

	  case ST_MACRO:
		len = sizeof(s->s_macro);
		break;

	  case ST_RULESET:
		len = sizeof(s->s_ruleset);
		break;

	  case ST_HEADER:
		len = sizeof(s->s_header);
		break;

	  case ST_SERVICE:
		len = sizeof(s->s_service);
		break;

#if LDAPMAP
	  case ST_LMAP:
		len = sizeof(s->s_lmap);
		break;
#endif /* LDAPMAP */

#if MILTER
	  case ST_MILTER:
		len = sizeof(s->s_milter);
		break;
#endif /* MILTER */

	  case ST_QUEUE:
		len = sizeof(s->s_quegrp);
		break;

#if SOCKETMAP
	  case ST_SOCKETMAP:
		len = sizeof(s->s_socketmap);
		break;
#endif /* SOCKETMAP */

	  default:
		/*
		**  Each mailer has its own MCI stab entry:
		**
		**  s = stab(host, ST_MCI + m->m_mno, ST_ENTER);
		**
		**  Therefore, anything ST_MCI or larger is an s_mci.
		*/

		if (type >= ST_MCI)
			len = sizeof(s->s_mci);
		else
		{
			syserr("stab: unknown symbol type %d", type);
			len = sizeof(s->s_value);
		}
		break;
	}
	len += sizeof(*s) - sizeof(s->s_value);

	if (tTd(36, 15))
		sm_dprintf("size of stab entry: %d\n", len);

	/* make new entry */
	s = (STAB *) sm_pmalloc_x(len);
	memset((char *) s, '\0', len);
	s->s_name = sm_pstrdup_x(name);
	s->s_symtype = type;

	/* link it in */
	*ps = s;

	/* set a default value for rulesets */
	if (type == ST_RULESET)
		s->s_ruleset = -1;

	return s;
}
/*
**  STABAPPLY -- apply function to all stab entries
**
**	Parameters:
**		func -- the function to apply.  It will be given two
**			parameters (the stab entry and the arg).
**		arg -- an arbitrary argument, passed to func.
**
**	Returns:
**		none.
*/

void
stabapply(func, arg)
	void (*func)__P((STAB *, int));
	int arg;
{
	register STAB **shead;
	register STAB *s;

	for (shead = SymTab; shead < &SymTab[STABSIZE]; shead++)
	{
		for (s = *shead; s != NULL; s = s->s_next)
		{
			if (tTd(36, 90))
				sm_dprintf("stabapply: trying %d/%s\n",
					s->s_symtype, s->s_name);
			func(s, arg);
		}
	}
}
/*
**  QUEUEUP_MACROS -- queueup the macros in a class
**
**	Write the macros listed in the specified class into the
**	file referenced by qfp.
**
**	Parameters:
**		class -- class ID.
**		qfp -- file pointer to the queue file.
**		e -- the envelope.
**
**	Returns:
**		none.
*/

void
queueup_macros(class, qfp, e)
	int class;
	SM_FILE_T *qfp;
	ENVELOPE *e;
{
	register STAB **shead;
	register STAB *s;

	if (e == NULL)
		return;

	class = bitidx(class);
	for (shead = SymTab; shead < &SymTab[STABSIZE]; shead++)
	{
		for (s = *shead; s != NULL; s = s->s_next)
		{
			int m;
			char *p;

			if (s->s_symtype == ST_CLASS &&
			    bitnset(bitidx(class), s->s_class) &&
			    (m = macid(s->s_name)) != 0 &&
			    (p = macvalue(m, e)) != NULL)
			{
				(void) sm_io_fprintf(qfp, SM_TIME_DEFAULT,
						      "$%s%s\n",
						      s->s_name,
						      denlstring(p, true,
								 false));
			}
		}
	}
}
/*
**  COPY_CLASS -- copy class members from one class to another
**
**	Parameters:
**		src -- source class.
**		dst -- destination class.
**
**	Returns:
**		none.
*/

void
copy_class(src, dst)
	int src;
	int dst;
{
	register STAB **shead;
	register STAB *s;

	src = bitidx(src);
	dst = bitidx(dst);
	for (shead = SymTab; shead < &SymTab[STABSIZE]; shead++)
	{
		for (s = *shead; s != NULL; s = s->s_next)
		{
			if (s->s_symtype == ST_CLASS &&
			    bitnset(src, s->s_class))
				setbitn(dst, s->s_class);
		}
	}
}

/*
**  RMEXPSTAB -- remove expired entries from SymTab.
**
**	These entries need to be removed in long-running processes,
**	e.g., persistent queue runners, to avoid consuming memory.
**
**	XXX It might be useful to restrict the maximum TTL to avoid
**		caching data very long.
**
**	Parameters:
**		none.
**
**	Returns:
**		none.
**
**	Side Effects:
**		can remove entries from the symbol table.
*/

#define SM_STAB_FREE(x)	\
	do \
	{ \
		char *o = (x); \
		(x) = NULL; \
		if (o != NULL) \
			sm_free(o); \
	} while (0)

void
rmexpstab()
{
	int i;
	STAB *s, *p, *f;
	time_t now;

	now = curtime();
	for (i = 0; i < STABSIZE; i++)
	{
		p = NULL;
		s = SymTab[i];
		while (s != NULL)
		{
			switch (s->s_symtype)
			{
			  case ST_HOSTSIG:
				if (s->s_hostsig.hs_exp >= now)
					goto next;	/* not expired */
				SM_STAB_FREE(s->s_hostsig.hs_sig); /* XXX */
				break;

			  case ST_NAMECANON:
				if (s->s_namecanon.nc_exp >= now)
					goto next;	/* not expired */
				SM_STAB_FREE(s->s_namecanon.nc_cname); /* XXX */
				break;

			  default:
				if (s->s_symtype >= ST_MCI)
				{
					/* call mci_uncache? */
					SM_STAB_FREE(s->s_mci.mci_status);
					SM_STAB_FREE(s->s_mci.mci_rstatus);
					SM_STAB_FREE(s->s_mci.mci_heloname);
#if 0
					/* not dynamically allocated */
					SM_STAB_FREE(s->s_mci.mci_host);
					SM_STAB_FREE(s->s_mci.mci_tolist);
#endif /* 0 */
#if SASL
					/* should always by NULL */
					SM_STAB_FREE(s->s_mci.mci_sasl_string);
#endif /* SASL */
					if (s->s_mci.mci_rpool != NULL)
					{
						sm_rpool_free(s->s_mci.mci_rpool);
						s->s_mci.mci_macro.mac_rpool = NULL;
						s->s_mci.mci_rpool = NULL;
					}
					break;
				}
  next:
				p = s;
				s = s->s_next;
				continue;
			}

			/* remove entry */
			SM_STAB_FREE(s->s_name); /* XXX */
			f = s;
			s = s->s_next;
			sm_free(f);	/* XXX */
			if (p == NULL)
				SymTab[i] = s;
			else
				p->s_next = s;
		}
	}
}

#if SM_HEAP_CHECK
/*
**  DUMPSTAB -- dump symbol table.
**
**	For debugging.
*/

#define MAXSTTYPES	(ST_MCI + 1)

void
dumpstab()
{
	int i, t, total, types[MAXSTTYPES];
	STAB *s;
	static int prevt[MAXSTTYPES], prev = 0;

	total = 0;
	for (i = 0; i < MAXSTTYPES; i++)
		types[i] = 0;
	for (i = 0; i < STABSIZE; i++)
	{
		s = SymTab[i];
		while (s != NULL)
		{
			++total;
			t = s->s_symtype;
			if (t > MAXSTTYPES - 1)
				t = MAXSTTYPES - 1;
			types[t]++;
			s = s->s_next;
		}
	}
	sm_syslog(LOG_INFO, NOQID, "stab: total=%d (%d)", total, total - prev);
	prev = total;
	for (i = 0; i < MAXSTTYPES; i++)
	{
		if (types[i] != 0)
		{
			sm_syslog(LOG_INFO, NOQID, "stab: type[%2d]=%2d (%d)",
				i, types[i], types[i] - prevt[i]);
		}
		prevt[i] = types[i];
	}
}
#endif /* SM_HEAP_CHECK */
OpenPOWER on IntegriCloud