1 /*
2 * Copyright (c) 1998-2001, 2003, 2006, 2007 Sendmail, Inc. and its suppliers.
3 * All rights reserved.
4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
5 * Copyright (c) 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * By using this file, you agree to the terms and conditions set
9 * forth in the LICENSE file which can be found at the top level of
10 * the sendmail distribution.
11 *
12 */
13
14 #include <sendmail.h>
15
16 SM_RCSID("@(#)$Id: macro.c,v 8.107 2007/08/06 22:29:02 ca Exp $")
17
18 #include <sm/sendmail.h>
19 #if MAXMACROID != (BITMAPBITS - 1)
20 ERROR Read the comment in conf.h
21 #endif /* MAXMACROID != (BITMAPBITS - 1) */
22
23 static char *MacroName[MAXMACROID + 1]; /* macro id to name table */
24
25 /*
26 ** Codes for long named macros.
27 ** See also macname():
28 * if not ASCII printable, look up the name *
29 if (n <= 0x20 || n > 0x7f)
30 ** First use 1 to NEXTMACROID_L, then use NEXTMACROID_H to MAXMACROID.
31 */
32
33 #define NEXTMACROID_L 037
34 #define NEXTMACROID_H 0240
35
36 #if _FFR_MORE_MACROS
37 /* table for next id in non-printable ASCII range: disallow some value */
38 static int NextMIdTable[] =
39 {
40 /* 0 nul */ 1,
41 /* 1 soh */ 2,
42 /* 2 stx */ 3,
43 /* 3 etx */ 4,
44 /* 4 eot */ 5,
45 /* 5 enq */ 6,
46 /* 6 ack */ 7,
47 /* 7 bel */ 8,
48 /* 8 bs */ 14,
49 /* 9 ht */ -1,
50 /* 10 nl */ -1,
51 /* 11 vt */ -1,
52 /* 12 np */ -1,
53 /* 13 cr */ -1,
54 /* 14 so */ 15,
55 /* 15 si */ 16,
56 /* 16 dle */ 17,
57 /* 17 dc1 */ 18,
58 /* 18 dc2 */ 19,
59 /* 19 dc3 */ 20,
60 /* 20 dc4 */ 21,
61 /* 21 nak */ 22,
62 /* 22 syn */ 23,
63 /* 23 etb */ 24,
64 /* 24 can */ 25,
65 /* 25 em */ 26,
66 /* 26 sub */ 27,
67 /* 27 esc */ 28,
68 /* 28 fs */ 29,
69 /* 29 gs */ 30,
70 /* 30 rs */ 31,
71 /* 31 us */ 32,
72 /* 32 sp */ -1,
73 };
74
75 #define NEXTMACROID(mid) ( \
76 (mid < NEXTMACROID_L) ? (NextMIdTable[mid]) : \
77 ((mid < NEXTMACROID_H) ? NEXTMACROID_H : (mid + 1)))
78
79 int NextMacroId = 1; /* codes for long named macros */
80 /* see sendmail.h: Special characters in rewriting rules. */
81 #else /* _FFR_MORE_MACROS */
82 int NextMacroId = 0240; /* codes for long named macros */
83 #define NEXTMACROID(mid) ((mid) + 1)
84 #endif /* _FFR_MORE_MACROS */
85
86
87 /*
88 ** INITMACROS -- initialize the macro system
89 **
90 ** This just involves defining some macros that are actually
91 ** used internally as metasymbols to be themselves.
92 **
93 ** Parameters:
94 ** none.
95 **
96 ** Returns:
97 ** none.
98 **
99 ** Side Effects:
100 ** initializes several macros to be themselves.
101 */
102
103 struct metamac MetaMacros[] =
104 {
105 /* LHS pattern matching characters */
106 { '*', MATCHZANY }, { '+', MATCHANY }, { '-', MATCHONE },
107 { '=', MATCHCLASS }, { '~', MATCHNCLASS },
108
109 /* these are RHS metasymbols */
110 { '#', CANONNET }, { '@', CANONHOST }, { ':', CANONUSER },
111 { '>', CALLSUBR },
112
113 /* the conditional operations */
114 { '?', CONDIF }, { '|', CONDELSE }, { '.', CONDFI },
115
116 /* the hostname lookup characters */
117 { '[', HOSTBEGIN }, { ']', HOSTEND },
118 { '(', LOOKUPBEGIN }, { ')', LOOKUPEND },
119
120 /* miscellaneous control characters */
121 { '&', MACRODEXPAND },
122
123 { '\0', '\0' }
124 };
125
126 #define MACBINDING(name, mid) \
127 stab(name, ST_MACRO, ST_ENTER)->s_macro = mid; \
128 MacroName[mid] = name;
129
130 void
initmacros(e)131 initmacros(e)
132 ENVELOPE *e;
133 {
134 struct metamac *m;
135 int c;
136 char buf[5];
137
138 for (m = MetaMacros; m->metaname != '\0'; m++)
139 {
140 buf[0] = m->metaval;
141 buf[1] = '\0';
142 macdefine(&e->e_macro, A_TEMP, m->metaname, buf);
143 }
144 buf[0] = MATCHREPL;
145 buf[2] = '\0';
146 for (c = '0'; c <= '9'; c++)
147 {
148 buf[1] = c;
149 macdefine(&e->e_macro, A_TEMP, c, buf);
150 }
151
152 /* set defaults for some macros sendmail will use later */
153 macdefine(&e->e_macro, A_PERM, 'n', "MAILER-DAEMON");
154
155 /* set up external names for some internal macros */
156 MACBINDING("opMode", MID_OPMODE);
157 /*XXX should probably add equivalents for all short macros here XXX*/
158 }
159
160 /*
161 ** EXPAND/DOEXPAND -- macro expand a string using $x escapes.
162 **
163 ** After expansion, the expansion will be in external form (that is,
164 ** there will be no sendmail metacharacters and METAQUOTEs will have
165 ** been stripped out).
166 **
167 ** Parameters:
168 ** s -- the string to expand.
169 ** buf -- the place to put the expansion.
170 ** bufsize -- the size of the buffer.
171 ** explevel -- the depth of expansion (doexpand only)
172 ** e -- envelope in which to work.
173 **
174 ** Returns:
175 ** none.
176 **
177 ** Side Effects:
178 ** none.
179 */
180
181 static void doexpand __P(( char *, char *, size_t, int, ENVELOPE *));
182
183 static void
doexpand(s,buf,bufsize,explevel,e)184 doexpand(s, buf, bufsize, explevel, e)
185 char *s;
186 char *buf;
187 size_t bufsize;
188 int explevel;
189 ENVELOPE *e;
190 {
191 char *xp;
192 char *q;
193 bool skipping; /* set if conditionally skipping output */
194 bool recurse; /* set if recursion required */
195 size_t i;
196 int skiplev; /* skipping nesting level */
197 int iflev; /* if nesting level */
198 bool quotenext; /* quote the following character */
199 char xbuf[MACBUFSIZE];
200
201 if (tTd(35, 24))
202 {
203 sm_dprintf("expand(");
204 xputs(sm_debug_file(), s);
205 sm_dprintf(")\n");
206 }
207
208 recurse = false;
209 skipping = false;
210 skiplev = 0;
211 iflev = 0;
212 quotenext = false;
213 if (s == NULL)
214 s = "";
215 for (xp = xbuf; *s != '\0'; s++)
216 {
217 int c;
218
219 /*
220 ** Check for non-ordinary (special?) character.
221 ** 'q' will be the interpolated quantity.
222 */
223
224 q = NULL;
225 c = *s & 0377;
226
227 if (quotenext)
228 {
229 quotenext = false;
230 goto simpleinterpolate;
231 }
232
233 switch (c)
234 {
235 case CONDIF: /* see if var set */
236 iflev++;
237 c = *++s & 0377;
238 if (skipping)
239 skiplev++;
240 else
241 {
242 char *mv;
243
244 mv = macvalue(c, e);
245 skipping = (mv == NULL || *mv == '\0');
246 }
247 continue;
248
249 case CONDELSE: /* change state of skipping */
250 if (iflev == 0)
251 break; /* XXX: error */
252 if (skiplev == 0)
253 skipping = !skipping;
254 continue;
255
256 case CONDFI: /* stop skipping */
257 if (iflev == 0)
258 break; /* XXX: error */
259 iflev--;
260 if (skiplev == 0)
261 skipping = false;
262 if (skipping)
263 skiplev--;
264 continue;
265
266 case MACROEXPAND: /* macro interpolation */
267 c = bitidx(*++s);
268 if (c != '\0')
269 q = macvalue(c, e);
270 else
271 {
272 s--;
273 q = NULL;
274 }
275 if (q == NULL)
276 continue;
277 break;
278
279 case METAQUOTE:
280 /* next octet completely quoted */
281 quotenext = true;
282 break;
283 }
284
285 /*
286 ** Interpolate q or output one character
287 */
288
289 simpleinterpolate:
290 if (skipping || xp >= &xbuf[sizeof(xbuf) - 1])
291 continue;
292 if (q == NULL)
293 *xp++ = c;
294 else
295 {
296 /* copy to end of q or max space remaining in buf */
297 bool hiderecurse = false;
298
299 while ((c = *q++) != '\0' &&
300 xp < &xbuf[sizeof(xbuf) - 1])
301 {
302 /* check for any sendmail metacharacters */
303 if (!hiderecurse && (c & 0340) == 0200)
304 recurse = true;
305 *xp++ = c;
306
307 /* give quoted characters a free ride */
308 hiderecurse = (c & 0377) == METAQUOTE;
309 }
310 }
311 }
312 *xp = '\0';
313
314 if (tTd(35, 28))
315 {
316 sm_dprintf("expand(%d) ==> ", explevel);
317 xputs(sm_debug_file(), xbuf);
318 sm_dprintf("\n");
319 }
320
321 /* recurse as appropriate */
322 if (recurse)
323 {
324 if (explevel < MaxMacroRecursion)
325 {
326 doexpand(xbuf, buf, bufsize, explevel + 1, e);
327 return;
328 }
329 syserr("expand: recursion too deep (%d max)",
330 MaxMacroRecursion);
331 }
332
333 /* copy results out */
334 if (explevel == 0)
335 (void) sm_strlcpy(buf, xbuf, bufsize);
336 else
337 {
338 /* leave in internal form */
339 i = xp - xbuf;
340 if (i >= bufsize)
341 i = bufsize - 1;
342 memmove(buf, xbuf, i);
343 buf[i] = '\0';
344 }
345
346 if (tTd(35, 24))
347 {
348 sm_dprintf("expand ==> ");
349 xputs(sm_debug_file(), buf);
350 sm_dprintf("\n");
351 }
352 }
353
354 void
expand(s,buf,bufsize,e)355 expand(s, buf, bufsize, e)
356 char *s;
357 char *buf;
358 size_t bufsize;
359 ENVELOPE *e;
360 {
361 doexpand(s, buf, bufsize, 0, e);
362 }
363
364 /*
365 ** MACDEFINE -- bind a macro name to a value
366 **
367 ** Set a macro to a value, with fancy storage management.
368 ** macdefine will make a copy of the value, if required,
369 ** and will ensure that the storage for the previous value
370 ** is not leaked.
371 **
372 ** Parameters:
373 ** mac -- Macro table.
374 ** vclass -- storage class of 'value', ignored if value==NULL.
375 ** A_HEAP means that the value was allocated by
376 ** malloc, and that macdefine owns the storage.
377 ** A_TEMP means that value points to temporary storage,
378 ** and thus macdefine needs to make a copy.
379 ** A_PERM means that value points to storage that
380 ** will remain allocated and unchanged for
381 ** at least the lifetime of mac. Use A_PERM if:
382 ** -- value == NULL,
383 ** -- value points to a string literal,
384 ** -- value was allocated from mac->mac_rpool
385 ** or (in the case of an envelope macro)
386 ** from e->e_rpool,
387 ** -- in the case of an envelope macro,
388 ** value is a string member of the envelope
389 ** such as e->e_sender.
390 ** id -- Macro id. This is a single character macro name
391 ** such as 'g', or a value returned by macid().
392 ** value -- Macro value: either NULL, or a string.
393 */
394
395 void
396 #if SM_HEAP_CHECK
macdefine_tagged(mac,vclass,id,value,file,line,grp)397 macdefine_tagged(mac, vclass, id, value, file, line, grp)
398 #else /* SM_HEAP_CHECK */
399 macdefine(mac, vclass, id, value)
400 #endif /* SM_HEAP_CHECK */
401 MACROS_T *mac;
402 ARGCLASS_T vclass;
403 int id;
404 char *value;
405 #if SM_HEAP_CHECK
406 char *file;
407 int line;
408 int grp;
409 #endif /* SM_HEAP_CHECK */
410 {
411 char *newvalue;
412
413 if (id < 0 || id > MAXMACROID)
414 return;
415
416 if (tTd(35, 9))
417 {
418 sm_dprintf("%sdefine(%s as ",
419 mac->mac_table[id] == NULL ? "" : "re", macname(id));
420 xputs(sm_debug_file(), value);
421 sm_dprintf(")\n");
422 }
423
424 if (mac->mac_rpool == NULL)
425 {
426 char *freeit = NULL;
427
428 if (mac->mac_table[id] != NULL &&
429 bitnset(id, mac->mac_allocated))
430 freeit = mac->mac_table[id];
431
432 if (value == NULL || vclass == A_HEAP)
433 {
434 sm_heap_checkptr_tagged(value, file, line);
435 newvalue = value;
436 clrbitn(id, mac->mac_allocated);
437 }
438 else
439 {
440 #if SM_HEAP_CHECK
441 newvalue = sm_strdup_tagged_x(value, file, line, 0);
442 #else /* SM_HEAP_CHECK */
443 newvalue = sm_strdup_x(value);
444 #endif /* SM_HEAP_CHECK */
445 setbitn(id, mac->mac_allocated);
446 }
447 mac->mac_table[id] = newvalue;
448 if (freeit != NULL)
449 sm_free(freeit);
450 }
451 else
452 {
453 if (value == NULL || vclass == A_PERM)
454 newvalue = value;
455 else
456 newvalue = sm_rpool_strdup_x(mac->mac_rpool, value);
457 mac->mac_table[id] = newvalue;
458 if (vclass == A_HEAP)
459 sm_free(value);
460 }
461
462 #if _FFR_RESET_MACRO_GLOBALS
463 switch (id)
464 {
465 case 'j':
466 PSTRSET(MyHostName, value);
467 break;
468 }
469 #endif /* _FFR_RESET_MACRO_GLOBALS */
470 }
471
472 /*
473 ** MACSET -- set a named macro to a value (low level)
474 **
475 ** No fancy storage management; the caller takes full responsibility.
476 ** Often used with macget; see also macdefine.
477 **
478 ** Parameters:
479 ** mac -- Macro table.
480 ** i -- Macro name, specified as an integer offset.
481 ** value -- Macro value: either NULL, or a string.
482 */
483
484 void
macset(mac,i,value)485 macset(mac, i, value)
486 MACROS_T *mac;
487 int i;
488 char *value;
489 {
490 if (i < 0 || i > MAXMACROID)
491 return;
492
493 if (tTd(35, 9))
494 {
495 sm_dprintf("macset(%s as ", macname(i));
496 xputs(sm_debug_file(), value);
497 sm_dprintf(")\n");
498 }
499 mac->mac_table[i] = value;
500 }
501
502 /*
503 ** MACVALUE -- return uninterpreted value of a macro.
504 **
505 ** Does fancy path searching.
506 ** The low level counterpart is macget.
507 **
508 ** Parameters:
509 ** n -- the name of the macro.
510 ** e -- envelope in which to start looking for the macro.
511 **
512 ** Returns:
513 ** The value of n.
514 **
515 ** Side Effects:
516 ** none.
517 */
518
519 char *
macvalue(n,e)520 macvalue(n, e)
521 int n;
522 ENVELOPE *e;
523 {
524 n = bitidx(n);
525 if (e != NULL && e->e_mci != NULL)
526 {
527 char *p = e->e_mci->mci_macro.mac_table[n];
528
529 if (p != NULL)
530 return p;
531 }
532 while (e != NULL)
533 {
534 char *p = e->e_macro.mac_table[n];
535
536 if (p != NULL)
537 return p;
538 if (e == e->e_parent)
539 break;
540 e = e->e_parent;
541 }
542 return GlobalMacros.mac_table[n];
543 }
544
545 /*
546 ** MACNAME -- return the name of a macro given its internal id
547 **
548 ** Parameter:
549 ** n -- the id of the macro
550 **
551 ** Returns:
552 ** The name of n.
553 **
554 ** Side Effects:
555 ** none.
556 **
557 ** WARNING:
558 ** Not thread-safe.
559 */
560
561 char *
macname(n)562 macname(n)
563 int n;
564 {
565 static char mbuf[2];
566
567 n = (int)(unsigned char)n;
568 if (n > MAXMACROID)
569 return "***OUT OF RANGE MACRO***";
570
571 /* if not ASCII printable, look up the name */
572 if (n <= 0x20 || n > 0x7f)
573 {
574 char *p = MacroName[n];
575
576 if (p != NULL)
577 return p;
578 return "***UNDEFINED MACRO***";
579 }
580
581 /* if in the ASCII graphic range, just return the id directly */
582 mbuf[0] = n;
583 mbuf[1] = '\0';
584 return mbuf;
585 }
586
587 /*
588 ** MACID_PARSE -- return id of macro identified by its name
589 **
590 ** Parameters:
591 ** p -- pointer to name string -- either a single
592 ** character or {name}.
593 ** ep -- filled in with the pointer to the byte
594 ** after the name.
595 **
596 ** Returns:
597 ** 0 -- An error was detected.
598 ** 1..MAXMACROID -- The internal id code for this macro.
599 **
600 ** Side Effects:
601 ** If this is a new macro name, a new id is allocated.
602 ** On error, syserr is called.
603 */
604
605 int
macid_parse(p,ep)606 macid_parse(p, ep)
607 char *p;
608 char **ep;
609 {
610 int mid;
611 char *bp;
612 char mbuf[MAXMACNAMELEN + 1];
613
614 if (tTd(35, 14))
615 {
616 sm_dprintf("macid(");
617 xputs(sm_debug_file(), p);
618 sm_dprintf(") => ");
619 }
620
621 if (*p == '\0' || (p[0] == '{' && p[1] == '}'))
622 {
623 syserr("Name required for macro/class");
624 if (ep != NULL)
625 *ep = p;
626 if (tTd(35, 14))
627 sm_dprintf("NULL\n");
628 return 0;
629 }
630 if (*p != '{')
631 {
632 /* the macro is its own code */
633 if (ep != NULL)
634 *ep = p + 1;
635 if (tTd(35, 14))
636 {
637 char buf[2];
638
639 buf[0] = *p;
640 buf[1] = '\0';
641 xputs(sm_debug_file(), buf);
642 sm_dprintf("\n");
643 }
644 return bitidx(*p);
645 }
646 bp = mbuf;
647 while (*++p != '\0' && *p != '}' && bp < &mbuf[sizeof(mbuf) - 1])
648 {
649 if (isascii(*p) && (isalnum(*p) || *p == '_'))
650 *bp++ = *p;
651 else
652 syserr("Invalid macro/class character %c", *p);
653 }
654 *bp = '\0';
655 mid = -1;
656 if (*p == '\0')
657 {
658 syserr("Unbalanced { on %s", mbuf); /* missing } */
659 }
660 else if (*p != '}')
661 {
662 syserr("Macro/class name ({%s}) too long (%d chars max)",
663 mbuf, (int) (sizeof(mbuf) - 1));
664 }
665 else if (mbuf[1] == '\0' && mbuf[0] >= 0x20)
666 {
667 /* ${x} == $x */
668 mid = bitidx(mbuf[0]);
669 p++;
670 }
671 else
672 {
673 STAB *s;
674
675 s = stab(mbuf, ST_MACRO, ST_ENTER);
676 if (s->s_macro != 0)
677 mid = s->s_macro;
678 else
679 {
680 if (NextMacroId > MAXMACROID)
681 {
682 syserr("Macro/class {%s}: too many long names",
683 mbuf);
684 s->s_macro = -1;
685 }
686 else
687 {
688 MacroName[NextMacroId] = s->s_name;
689 s->s_macro = mid = NextMacroId;
690 NextMacroId = NEXTMACROID(NextMacroId);
691 }
692 }
693 p++;
694 }
695 if (ep != NULL)
696 *ep = p;
697 if (mid < 0 || mid > MAXMACROID)
698 {
699 syserr("Unable to assign macro/class ID (mid = 0x%x)", mid);
700 if (tTd(35, 14))
701 sm_dprintf("NULL\n");
702 return 0;
703 }
704 if (tTd(35, 14))
705 sm_dprintf("0x%x\n", mid);
706 return mid;
707 }
708
709 /*
710 ** WORDINCLASS -- tell if a word is in a specific class
711 **
712 ** Parameters:
713 ** str -- the name of the word to look up.
714 ** cl -- the class name.
715 **
716 ** Returns:
717 ** true if str can be found in cl.
718 ** false otherwise.
719 */
720
721 bool
wordinclass(str,cl)722 wordinclass(str, cl)
723 char *str;
724 int cl;
725 {
726 STAB *s;
727
728 s = stab(str, ST_CLASS, ST_FIND);
729 return s != NULL && bitnset(bitidx(cl), s->s_class);
730 }
731