contrib/sendmail-8.14/sendmail/macro.c

   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
 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
 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
 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
 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
 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 *
 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 *
 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
 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
 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 }