| 1 | /* $Cambridge: exim/src/src/match.c,v 1.17 2007/01/08 10:50:18 ph10 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | /* Functions for matching strings */ |
| 11 | |
| 12 | |
| 13 | #include "exim.h" |
| 14 | |
| 15 | |
| 16 | /* Argument block for the check_string() function. This is used for general |
| 17 | strings, domains, and local parts. */ |
| 18 | |
| 19 | typedef struct check_string_block { |
| 20 | uschar *origsubject; /* caseful; keep these two first, in */ |
| 21 | uschar *subject; /* step with the block below */ |
| 22 | int expand_setup; |
| 23 | BOOL use_partial; |
| 24 | BOOL caseless; |
| 25 | BOOL at_is_special; |
| 26 | } check_string_block; |
| 27 | |
| 28 | |
| 29 | /* Argument block for the check_address() function. This is used for whole |
| 30 | addresses. */ |
| 31 | |
| 32 | typedef struct check_address_block { |
| 33 | uschar *origaddress; /* caseful; keep these two first, in */ |
| 34 | uschar *address; /* step with the block above */ |
| 35 | int expand_setup; |
| 36 | BOOL caseless; |
| 37 | } check_address_block; |
| 38 | |
| 39 | |
| 40 | |
| 41 | /************************************************* |
| 42 | * Generalized string match * |
| 43 | *************************************************/ |
| 44 | |
| 45 | /* This function does a single match of a subject against a pattern, and |
| 46 | optionally sets up the numeric variables according to what it matched. It is |
| 47 | called from match_isinlist() via match_check_list() when scanning a list, and |
| 48 | from match_check_string() when testing just a single item. The subject and |
| 49 | options arguments are passed in a check_string_block so as to make it easier to |
| 50 | pass them through match_check_list. |
| 51 | |
| 52 | The possible types of pattern are: |
| 53 | |
| 54 | . regular expression - starts with ^ |
| 55 | . tail match - starts with * |
| 56 | . lookup - starts with search type |
| 57 | . if at_is_special is set in the argument block: |
| 58 | @ matches the primary host name |
| 59 | @[] matches a local IP address in brackets |
| 60 | @mx_any matches any domain with an MX to the local host |
| 61 | @mx_primary matches any domain with a primary MX to the local host |
| 62 | @mx_secondary matches any domain with a secondary MX to the local host |
| 63 | . literal - anything else |
| 64 | |
| 65 | Any of the @mx_xxx options can be followed by "/ignore=<list>" where <list> is |
| 66 | a list of IP addresses that are to be ignored (typically 127.0.0.1). |
| 67 | |
| 68 | Arguments: |
| 69 | arg check_string_block pointer - see below |
| 70 | pattern the pattern to be matched |
| 71 | valueptr if not NULL, and a lookup is done, return the result here |
| 72 | instead of discarding it; else set it to point to NULL |
| 73 | error for error messages (not used in this function; it never |
| 74 | returns ERROR) |
| 75 | |
| 76 | Contents of the argument block: |
| 77 | origsubject the subject in its original casing |
| 78 | subject the subject string to be checked, lowercased if caseless |
| 79 | expand_setup if < 0, don't set up any numeric expansion variables; |
| 80 | if = 0, set $0 to whole subject, and either |
| 81 | $1 to what matches * or |
| 82 | $1, $2, ... to r.e. bracketed items |
| 83 | if > 0, don't set $0, but do set either |
| 84 | $n to what matches *, or |
| 85 | $n, $n+1, ... to r.e. bracketed items |
| 86 | (where n = expand_setup) |
| 87 | use_partial if FALSE, override any partial- search types |
| 88 | caseless TRUE for caseless matching where possible |
| 89 | at_is_special enable special handling of items starting with @ |
| 90 | |
| 91 | Returns: OK if matched |
| 92 | FAIL if not matched |
| 93 | DEFER if lookup deferred |
| 94 | */ |
| 95 | |
| 96 | static int |
| 97 | check_string(void *arg, uschar *pattern, uschar **valueptr, uschar **error) |
| 98 | { |
| 99 | check_string_block *cb = (check_string_block *)arg; |
| 100 | int search_type, partial, affixlen, starflags; |
| 101 | int expand_setup = cb->expand_setup; |
| 102 | uschar *affix; |
| 103 | uschar *s; |
| 104 | uschar *filename = NULL; |
| 105 | uschar *keyquery, *result, *semicolon; |
| 106 | void *handle; |
| 107 | |
| 108 | error = error; /* Keep clever compilers from complaining */ |
| 109 | |
| 110 | if (valueptr != NULL) *valueptr = NULL; /* For non-lookup matches */ |
| 111 | |
| 112 | /* For regular expressions, use cb->origsubject rather than cb->subject so that |
| 113 | it works if the pattern uses (?-i) to turn off case-independence, overriding |
| 114 | "caseless". */ |
| 115 | |
| 116 | s = (pattern[0] == '^')? cb->origsubject : cb->subject; |
| 117 | |
| 118 | /* If required to set up $0, initialize the data but don't turn on by setting |
| 119 | expand_nmax until the match is assured. */ |
| 120 | |
| 121 | expand_nmax = -1; |
| 122 | if (expand_setup == 0) |
| 123 | { |
| 124 | expand_nstring[0] = s; |
| 125 | expand_nlength[0] = Ustrlen(s); |
| 126 | } |
| 127 | else if (expand_setup > 0) expand_setup--; |
| 128 | |
| 129 | /* Regular expression match: compile, match, and set up $ variables if |
| 130 | required. */ |
| 131 | |
| 132 | if (pattern[0] == '^') |
| 133 | { |
| 134 | const pcre *re = regex_must_compile(pattern, cb->caseless, FALSE); |
| 135 | return ((expand_setup < 0)? |
| 136 | pcre_exec(re, NULL, CS s, Ustrlen(s), 0, PCRE_EOPT, NULL, 0) >= 0 |
| 137 | : |
| 138 | regex_match_and_setup(re, s, 0, expand_setup) |
| 139 | )? |
| 140 | OK : FAIL; |
| 141 | } |
| 142 | |
| 143 | /* Tail match */ |
| 144 | |
| 145 | if (pattern[0] == '*') |
| 146 | { |
| 147 | BOOL yield; |
| 148 | int slen = Ustrlen(s); |
| 149 | int patlen; /* Sun compiler doesn't like non-constant initializer */ |
| 150 | |
| 151 | patlen = Ustrlen(++pattern); |
| 152 | if (patlen > slen) return FAIL; |
| 153 | yield = cb->caseless? |
| 154 | (strncmpic(s + slen - patlen, pattern, patlen) == 0) : |
| 155 | (Ustrncmp(s + slen - patlen, pattern, patlen) == 0); |
| 156 | if (yield && expand_setup >= 0) |
| 157 | { |
| 158 | expand_nstring[++expand_setup] = s; |
| 159 | expand_nlength[expand_setup] = slen - patlen; |
| 160 | expand_nmax = expand_setup; |
| 161 | } |
| 162 | return yield? OK : FAIL; |
| 163 | } |
| 164 | |
| 165 | /* Match a special item starting with @ if so enabled. On its own, "@" matches |
| 166 | the primary host name - implement this by changing the pattern. For the other |
| 167 | cases we have to do some more work. If we don't recognize a special pattern, |
| 168 | just fall through - the match will fail. */ |
| 169 | |
| 170 | if (cb->at_is_special && pattern[0] == '@') |
| 171 | { |
| 172 | if (pattern[1] == 0) |
| 173 | { |
| 174 | pattern = primary_hostname; |
| 175 | goto NOT_AT_SPECIAL; /* Handle as exact string match */ |
| 176 | } |
| 177 | |
| 178 | if (Ustrcmp(pattern, "@[]") == 0) |
| 179 | { |
| 180 | ip_address_item *ip; |
| 181 | int slen = Ustrlen(s); |
| 182 | if (s[0] != '[' && s[slen-1] != ']') return FAIL; |
| 183 | for (ip = host_find_interfaces(); ip != NULL; ip = ip->next) |
| 184 | if (Ustrncmp(ip->address, s+1, slen - 2) == 0 |
| 185 | && ip->address[slen - 2] == 0) |
| 186 | return OK; |
| 187 | return FAIL; |
| 188 | } |
| 189 | |
| 190 | if (strncmpic(pattern, US"@mx_", 4) == 0) |
| 191 | { |
| 192 | int rc; |
| 193 | host_item h; |
| 194 | BOOL prim = FALSE; |
| 195 | BOOL secy = FALSE; |
| 196 | BOOL removed = FALSE; |
| 197 | uschar *ss = pattern + 4; |
| 198 | uschar *ignore_target_hosts = NULL; |
| 199 | |
| 200 | if (strncmpic(ss, US"any", 3) == 0) ss += 3; |
| 201 | else if (strncmpic(ss, US"primary", 7) == 0) |
| 202 | { |
| 203 | ss += 7; |
| 204 | prim = TRUE; |
| 205 | } |
| 206 | else if (strncmpic(ss, US"secondary", 9) == 0) |
| 207 | { |
| 208 | ss += 9; |
| 209 | secy = TRUE; |
| 210 | } |
| 211 | else goto NOT_AT_SPECIAL; |
| 212 | |
| 213 | if (strncmpic(ss, US"/ignore=", 8) == 0) ignore_target_hosts = ss + 8; |
| 214 | else if (*ss != 0) goto NOT_AT_SPECIAL; |
| 215 | |
| 216 | h.next = NULL; |
| 217 | h.name = s; |
| 218 | h.address = NULL; |
| 219 | |
| 220 | rc = host_find_bydns(&h, |
| 221 | ignore_target_hosts, |
| 222 | HOST_FIND_BY_MX, /* search only for MX, not SRV or A */ |
| 223 | NULL, /* service name not relevant */ |
| 224 | NULL, /* srv_fail_domains not relevant */ |
| 225 | NULL, /* mx_fail_domains not relevant */ |
| 226 | NULL, /* no feedback FQDN */ |
| 227 | &removed); /* feedback if local removed */ |
| 228 | |
| 229 | if (rc == HOST_FIND_AGAIN) |
| 230 | { |
| 231 | search_error_message = string_sprintf("DNS lookup of \"%s\" deferred", s); |
| 232 | return DEFER; |
| 233 | } |
| 234 | |
| 235 | if (rc == HOST_FOUND_LOCAL && !secy) return OK; |
| 236 | if (prim) return FAIL; |
| 237 | return removed? OK : FAIL; |
| 238 | |
| 239 | /*** The above line used to be the following line, but this is incorrect, |
| 240 | because host_find_bydns() may return HOST_NOT_FOUND if it removed some MX |
| 241 | hosts, but the remaining ones were non-existent. All we are interested in |
| 242 | is whether or not it removed some hosts. |
| 243 | |
| 244 | return (rc == HOST_FOUND && removed)? OK : FAIL; |
| 245 | ***/ |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | /* Escape point from code for specials that start with "@" */ |
| 250 | |
| 251 | NOT_AT_SPECIAL: |
| 252 | |
| 253 | /* This is an exact string match if there is no semicolon in the pattern. */ |
| 254 | |
| 255 | if ((semicolon = Ustrchr(pattern, ';')) == NULL) |
| 256 | { |
| 257 | BOOL yield = cb->caseless? |
| 258 | (strcmpic(s, pattern) == 0) : (Ustrcmp(s, pattern) == 0); |
| 259 | if (yield && expand_setup >= 0) expand_nmax = expand_setup; |
| 260 | return yield? OK : FAIL; |
| 261 | } |
| 262 | |
| 263 | /* Otherwise we have a lookup item. The lookup type, including partial, etc. is |
| 264 | the part of the string preceding the semicolon. */ |
| 265 | |
| 266 | *semicolon = 0; |
| 267 | search_type = search_findtype_partial(pattern, &partial, &affix, &affixlen, |
| 268 | &starflags); |
| 269 | *semicolon = ';'; |
| 270 | if (search_type < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
| 271 | search_error_message); |
| 272 | |
| 273 | /* Partial matching is not appropriate for certain lookups (e.g. when looking |
| 274 | up user@domain for sender rejection). There's a flag to disable it. */ |
| 275 | |
| 276 | if (!cb->use_partial) partial = -1; |
| 277 | |
| 278 | /* Set the parameters for the three different kinds of lookup. */ |
| 279 | |
| 280 | keyquery = semicolon + 1; |
| 281 | while (isspace(*keyquery)) keyquery++; |
| 282 | |
| 283 | if (mac_islookup(search_type, lookup_absfilequery)) |
| 284 | { |
| 285 | filename = keyquery; |
| 286 | while (*keyquery != 0 && !isspace(*keyquery)) keyquery++; |
| 287 | filename = string_copyn(filename, keyquery - filename); |
| 288 | while (isspace(*keyquery)) keyquery++; |
| 289 | } |
| 290 | |
| 291 | else if (!mac_islookup(search_type, lookup_querystyle)) |
| 292 | { |
| 293 | filename = keyquery; |
| 294 | keyquery = s; |
| 295 | } |
| 296 | |
| 297 | /* Now do the actual lookup; throw away the data returned unless it was asked |
| 298 | for; partial matching is all handled inside search_find(). Note that there is |
| 299 | no search_close() because of the caching arrangements. */ |
| 300 | |
| 301 | handle = search_open(filename, search_type, 0, NULL, NULL); |
| 302 | if (handle == NULL) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
| 303 | search_error_message); |
| 304 | result = search_find(handle, filename, keyquery, partial, affix, affixlen, |
| 305 | starflags, &expand_setup); |
| 306 | |
| 307 | if (result == NULL) return search_find_defer? DEFER : FAIL; |
| 308 | if (valueptr != NULL) *valueptr = result; |
| 309 | |
| 310 | expand_nmax = expand_setup; |
| 311 | return OK; |
| 312 | } |
| 313 | |
| 314 | |
| 315 | |
| 316 | /************************************************* |
| 317 | * Public interface to check_string() * |
| 318 | *************************************************/ |
| 319 | |
| 320 | /* This function is called from several places where is it most convenient to |
| 321 | pass the arguments individually. It places them in a check_string_block |
| 322 | structure, and then calls check_string(). |
| 323 | |
| 324 | Arguments: |
| 325 | s the subject string to be checked |
| 326 | pattern the pattern to check it against |
| 327 | expand_setup expansion setup option (see check_string()) |
| 328 | use_partial if FALSE, override any partial- search types |
| 329 | caseless TRUE for caseless matching where possible |
| 330 | at_is_special TRUE to recognize @, @[], etc. |
| 331 | valueptr if not NULL, and a file lookup was done, return the result |
| 332 | here instead of discarding it; else set it to point to NULL |
| 333 | |
| 334 | Returns: OK if matched |
| 335 | FAIL if not matched |
| 336 | DEFER if lookup deferred |
| 337 | */ |
| 338 | |
| 339 | int |
| 340 | match_check_string(uschar *s, uschar *pattern, int expand_setup, |
| 341 | BOOL use_partial, BOOL caseless, BOOL at_is_special, uschar **valueptr) |
| 342 | { |
| 343 | check_string_block cb; |
| 344 | cb.origsubject = s; |
| 345 | cb.subject = caseless? string_copylc(s) : string_copy(s); |
| 346 | cb.expand_setup = expand_setup; |
| 347 | cb.use_partial = use_partial; |
| 348 | cb.caseless = caseless; |
| 349 | cb.at_is_special = at_is_special; |
| 350 | return check_string(&cb, pattern, valueptr, NULL); |
| 351 | } |
| 352 | |
| 353 | |
| 354 | |
| 355 | /************************************************* |
| 356 | * Get key string from check block * |
| 357 | *************************************************/ |
| 358 | |
| 359 | /* When caching the data from a lookup for a named list, we have to save the |
| 360 | key that was found, because other lookups of different keys on the same list |
| 361 | may occur. This function has knowledge of the different lookup types, and |
| 362 | extracts the appropriate key. |
| 363 | |
| 364 | Arguments: |
| 365 | arg the check block |
| 366 | type MCL_STRING, MCL_DOMAIN, MCL_HOST, MCL_ADDRESS, or MCL_LOCALPART |
| 367 | */ |
| 368 | |
| 369 | static uschar * |
| 370 | get_check_key(void *arg, int type) |
| 371 | { |
| 372 | switch(type) |
| 373 | { |
| 374 | case MCL_STRING: |
| 375 | case MCL_DOMAIN: |
| 376 | case MCL_LOCALPART: |
| 377 | return ((check_string_block *)arg)->subject; |
| 378 | |
| 379 | case MCL_HOST: |
| 380 | return ((check_host_block *)arg)->host_address; |
| 381 | |
| 382 | case MCL_ADDRESS: |
| 383 | return ((check_address_block *)arg)->address; |
| 384 | } |
| 385 | return US""; /* In practice, should never happen */ |
| 386 | } |
| 387 | |
| 388 | |
| 389 | |
| 390 | /************************************************* |
| 391 | * Scan list and run matching function * |
| 392 | *************************************************/ |
| 393 | |
| 394 | /* This function scans a list of patterns, and runs a matching function for |
| 395 | each item in the list. It is called from the functions that match domains, |
| 396 | local parts, hosts, and addresses, because its overall structure is the same in |
| 397 | all cases. However, the details of each particular match is different, so it |
| 398 | calls back to a given function do perform an actual match. |
| 399 | |
| 400 | We can't quite keep the different types anonymous here because they permit |
| 401 | different special cases. A pity. |
| 402 | |
| 403 | If a list item starts with !, that implies negation if the subject matches the |
| 404 | rest of the item (ignoring white space after the !). The result when the end of |
| 405 | the list is reached is FALSE unless the last item on the list is negated, in |
| 406 | which case it is TRUE. A file name in the list causes its lines to be |
| 407 | interpolated as if items in the list. An item starting with + is a named |
| 408 | sublist, obtained by searching the tree pointed to by anchorptr, with possible |
| 409 | cached match results in cache_bits. |
| 410 | |
| 411 | Arguments: |
| 412 | listptr pointer to the pointer to the list |
| 413 | sep separator character for string_nextinlist(); |
| 414 | normally zero for a standard list; |
| 415 | sometimes UCHAR_MAX+1 for single items; |
| 416 | anchorptr -> tree of named items, or NULL if no named items |
| 417 | cache_ptr pointer to pointer to cache bits for named items, or |
| 418 | pointer to NULL if not caching; may get set NULL if an |
| 419 | uncacheable named list is encountered |
| 420 | func function to call back to do one test |
| 421 | arg pointer to pass to the function; the string to be matched is |
| 422 | in the structure it points to |
| 423 | type MCL_STRING, MCL_DOMAIN, MCL_HOST, MCL_ADDRESS, or MCL_LOCALPART |
| 424 | these are used for some special handling |
| 425 | MCL_NOEXPAND (whose value is greater than any of them) may |
| 426 | be added to any value to suppress expansion of the list |
| 427 | name string to use in debugging info |
| 428 | valueptr where to pass back data from a lookup |
| 429 | |
| 430 | Returns: OK if matched a non-negated item |
| 431 | OK if hit end of list after a negated item |
| 432 | FAIL if expansion force-failed |
| 433 | FAIL if matched a negated item |
| 434 | FAIL if hit end of list after a non-negated item |
| 435 | DEFER if a something deferred or expansion failed |
| 436 | */ |
| 437 | |
| 438 | int |
| 439 | match_check_list(uschar **listptr, int sep, tree_node **anchorptr, |
| 440 | unsigned int **cache_ptr, int (*func)(void *,uschar *,uschar **,uschar **), |
| 441 | void *arg, int type, uschar *name, uschar **valueptr) |
| 442 | { |
| 443 | int yield = OK; |
| 444 | unsigned int *original_cache_bits = *cache_ptr; |
| 445 | BOOL include_unknown = FALSE; |
| 446 | BOOL ignore_unknown = FALSE; |
| 447 | uschar *list; |
| 448 | uschar *sss; |
| 449 | uschar *ot = NULL; |
| 450 | uschar buffer[1024]; |
| 451 | |
| 452 | /* Save time by not scanning for the option name when we don't need it. */ |
| 453 | |
| 454 | HDEBUG(D_any) |
| 455 | { |
| 456 | uschar *listname = readconf_find_option(listptr); |
| 457 | if (listname[0] != 0) ot = string_sprintf("%s in %s?", name, listname); |
| 458 | } |
| 459 | |
| 460 | /* If the list is empty, the answer is no. Skip the debugging output for |
| 461 | an unnamed list. */ |
| 462 | |
| 463 | if (*listptr == NULL) |
| 464 | { |
| 465 | HDEBUG(D_lists) |
| 466 | { |
| 467 | if (ot != NULL) debug_printf("%s no (option unset)\n", ot); |
| 468 | } |
| 469 | return FAIL; |
| 470 | } |
| 471 | |
| 472 | /* Expand the list before we scan it. A forced expansion gives the answer |
| 473 | "not in list"; other expansion errors cause DEFER to be returned. However, |
| 474 | if the type value is greater than or equal to than MCL_NOEXPAND, do not expand |
| 475 | the list. */ |
| 476 | |
| 477 | if (type >= MCL_NOEXPAND) |
| 478 | { |
| 479 | list = *listptr; |
| 480 | type -= MCL_NOEXPAND; /* Remove the "no expand" flag */ |
| 481 | } |
| 482 | else |
| 483 | { |
| 484 | /* If we are searching a domain list, and $domain is not set, set it to the |
| 485 | subject that is being sought for the duration of the expansion. */ |
| 486 | |
| 487 | if (type == MCL_DOMAIN && deliver_domain == NULL) |
| 488 | { |
| 489 | check_string_block *cb = (check_string_block *)arg; |
| 490 | deliver_domain = cb->subject; |
| 491 | list = expand_string(*listptr); |
| 492 | deliver_domain = NULL; |
| 493 | } |
| 494 | |
| 495 | else list = expand_string(*listptr); |
| 496 | |
| 497 | if (list == NULL) |
| 498 | { |
| 499 | if (expand_string_forcedfail) |
| 500 | { |
| 501 | HDEBUG(D_lists) debug_printf("expansion of \"%s\" forced failure: " |
| 502 | "assume not in this list\n", *listptr); |
| 503 | return FAIL; |
| 504 | } |
| 505 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand \"%s\" while checking " |
| 506 | "a list: %s", *listptr, expand_string_message); |
| 507 | return DEFER; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | /* For an unnamed list, use the expanded version in comments */ |
| 512 | |
| 513 | HDEBUG(D_any) |
| 514 | { |
| 515 | if (ot == NULL) ot = string_sprintf("%s in \"%s\"?", name, list); |
| 516 | } |
| 517 | |
| 518 | /* Now scan the list and process each item in turn, until one of them matches, |
| 519 | or we hit an error. */ |
| 520 | |
| 521 | while ((sss = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) != NULL) |
| 522 | { |
| 523 | uschar *ss = sss; |
| 524 | |
| 525 | /* Address lists may contain +caseful, to restore caseful matching of the |
| 526 | local part. We have to know the layout of the control block, unfortunately. |
| 527 | The lower cased address is in a temporary buffer, so we just copy the local |
| 528 | part back to the start of it (if a local part exists). */ |
| 529 | |
| 530 | if (type == MCL_ADDRESS) |
| 531 | { |
| 532 | if (Ustrcmp(ss, "+caseful") == 0) |
| 533 | { |
| 534 | check_address_block *cb = (check_address_block *)arg; |
| 535 | uschar *at = Ustrrchr(cb->origaddress, '@'); |
| 536 | if (at != NULL) |
| 537 | Ustrncpy(cb->address, cb->origaddress, at - cb->origaddress); |
| 538 | cb->caseless = FALSE; |
| 539 | continue; |
| 540 | } |
| 541 | } |
| 542 | |
| 543 | /* Similar processing for local parts */ |
| 544 | |
| 545 | else if (type == MCL_LOCALPART) |
| 546 | { |
| 547 | if (Ustrcmp(ss, "+caseful") == 0) |
| 548 | { |
| 549 | check_string_block *cb = (check_string_block *)arg; |
| 550 | Ustrcpy(cb->subject, cb->origsubject); |
| 551 | cb->caseless = FALSE; |
| 552 | continue; |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | /* If the host item is "+include_unknown", remember it in case there's a |
| 557 | subsequent failed reverse lookup. */ |
| 558 | |
| 559 | else if (type == MCL_HOST) |
| 560 | { |
| 561 | if (Ustrcmp(ss, "+include_unknown") == 0) |
| 562 | { |
| 563 | include_unknown = TRUE; |
| 564 | ignore_unknown = FALSE; |
| 565 | continue; |
| 566 | } |
| 567 | if (Ustrcmp(ss, "+ignore_unknown") == 0) |
| 568 | { |
| 569 | ignore_unknown = TRUE; |
| 570 | include_unknown = FALSE; |
| 571 | continue; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | /* Starting with ! specifies a negative item. It is theoretically possible |
| 576 | for a local part to start with !. In that case, a regex has to be used. */ |
| 577 | |
| 578 | if (*ss == '!') |
| 579 | { |
| 580 | yield = FAIL; |
| 581 | while (isspace((*(++ss)))); |
| 582 | } |
| 583 | else yield = OK; |
| 584 | |
| 585 | /* If the item does not begin with '/', it might be a + item for a named |
| 586 | list. Otherwise, it is just a single list entry that has to be matched. |
| 587 | We recognize '+' only when supplied with a tree of named lists. */ |
| 588 | |
| 589 | if (*ss != '/') |
| 590 | { |
| 591 | if (*ss == '+' && anchorptr != NULL) |
| 592 | { |
| 593 | int bits = 0; |
| 594 | int offset = 0; |
| 595 | int shift = 0; |
| 596 | unsigned int *use_cache_bits = original_cache_bits; |
| 597 | uschar *cached = US""; |
| 598 | namedlist_block *nb; |
| 599 | tree_node *t = tree_search(*anchorptr, ss+1); |
| 600 | |
| 601 | if (t == NULL) |
| 602 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unknown named%s list \"%s\"", |
| 603 | (type == MCL_DOMAIN)? " domain" : |
| 604 | (type == MCL_HOST)? " host" : |
| 605 | (type == MCL_ADDRESS)? " address" : |
| 606 | (type == MCL_LOCALPART)? " local part" : "", |
| 607 | ss); |
| 608 | nb = t->data.ptr; |
| 609 | |
| 610 | /* If the list number is negative, it means that this list is not |
| 611 | cacheable because it contains expansion items. */ |
| 612 | |
| 613 | if (nb->number < 0) use_cache_bits = NULL; |
| 614 | |
| 615 | /* If we have got a cache pointer, get the bits. This is not an "else" |
| 616 | because the pointer may be NULL from the start if caching is not |
| 617 | required. */ |
| 618 | |
| 619 | if (use_cache_bits != NULL) |
| 620 | { |
| 621 | offset = (nb->number)/16; |
| 622 | shift = ((nb->number)%16)*2; |
| 623 | bits = use_cache_bits[offset] & (3 << shift); |
| 624 | } |
| 625 | |
| 626 | /* Not previously tested or no cache - run the full test */ |
| 627 | |
| 628 | if (bits == 0) |
| 629 | { |
| 630 | switch (match_check_list(&(nb->string), 0, anchorptr, &use_cache_bits, |
| 631 | func, arg, type, name, valueptr)) |
| 632 | { |
| 633 | case OK: bits = 1; break; |
| 634 | case FAIL: bits = 3; break; |
| 635 | case DEFER: goto DEFER_RETURN; |
| 636 | } |
| 637 | |
| 638 | /* If this list was uncacheable, or a sublist turned out to be |
| 639 | uncacheable, the value of use_cache_bits will now be NULL, even if it |
| 640 | wasn't before. Ensure that this is passed up to the next level. |
| 641 | Otherwise, remember the result of the search in the cache. */ |
| 642 | |
| 643 | if (use_cache_bits == NULL) |
| 644 | { |
| 645 | *cache_ptr = NULL; |
| 646 | } |
| 647 | else |
| 648 | { |
| 649 | use_cache_bits[offset] |= bits << shift; |
| 650 | |
| 651 | if (valueptr != NULL) |
| 652 | { |
| 653 | int old_pool = store_pool; |
| 654 | namedlist_cacheblock *p; |
| 655 | |
| 656 | /* Cached data for hosts persists over more than one message, |
| 657 | so we use the permanent store pool */ |
| 658 | |
| 659 | store_pool = POOL_PERM; |
| 660 | p = store_get(sizeof(namedlist_cacheblock)); |
| 661 | p->key = string_copy(get_check_key(arg, type)); |
| 662 | |
| 663 | |
| 664 | p->data = (*valueptr == NULL)? NULL : string_copy(*valueptr); |
| 665 | store_pool = old_pool; |
| 666 | |
| 667 | p->next = nb->cache_data; |
| 668 | nb->cache_data = p; |
| 669 | if (*valueptr != NULL) |
| 670 | { |
| 671 | DEBUG(D_lists) debug_printf("data from lookup saved for " |
| 672 | "cache for %s: %s\n", ss, *valueptr); |
| 673 | } |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | /* Previously cached; to find a lookup value, search a chain of values |
| 679 | and compare keys. Typically, there is only one such, but it is possible |
| 680 | for different keys to have matched the same named list. */ |
| 681 | |
| 682 | else |
| 683 | { |
| 684 | DEBUG(D_lists) debug_printf("cached %s match for %s\n", |
| 685 | ((bits & (-bits)) == bits)? "yes" : "no", ss); |
| 686 | cached = US" - cached"; |
| 687 | if (valueptr != NULL) |
| 688 | { |
| 689 | uschar *key = get_check_key(arg, type); |
| 690 | namedlist_cacheblock *p; |
| 691 | for (p = nb->cache_data; p != NULL; p = p->next) |
| 692 | { |
| 693 | if (Ustrcmp(key, p->key) == 0) |
| 694 | { |
| 695 | *valueptr = p->data; |
| 696 | break; |
| 697 | } |
| 698 | } |
| 699 | DEBUG(D_lists) debug_printf("cached lookup data = %s\n", *valueptr); |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | /* Result of test is indicated by value in bits. For each test, we |
| 704 | have 00 => untested, 01 => tested yes, 11 => tested no. */ |
| 705 | |
| 706 | if ((bits & (-bits)) == bits) /* Only one of the two bits is set */ |
| 707 | { |
| 708 | HDEBUG(D_lists) debug_printf("%s %s (matched \"%s\"%s)\n", ot, |
| 709 | (yield == OK)? "yes" : "no", sss, cached); |
| 710 | return yield; |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | /* Run the provided function to do the individual test. */ |
| 715 | |
| 716 | else |
| 717 | { |
| 718 | uschar *error; |
| 719 | switch ((func)(arg, ss, valueptr, &error)) |
| 720 | { |
| 721 | case OK: |
| 722 | HDEBUG(D_lists) debug_printf("%s %s (matched \"%s\")\n", ot, |
| 723 | (yield == OK)? "yes" : "no", sss); |
| 724 | return yield; |
| 725 | |
| 726 | case DEFER: |
| 727 | goto DEFER_RETURN; |
| 728 | |
| 729 | /* The ERROR return occurs when checking hosts, when either a forward |
| 730 | or reverse lookup has failed. It can also occur in a match_ip list if a |
| 731 | non-IP address item is encountered. The error string gives details of |
| 732 | which it was. */ |
| 733 | |
| 734 | case ERROR: |
| 735 | if (ignore_unknown) |
| 736 | { |
| 737 | HDEBUG(D_lists) debug_printf("%s: item ignored by +ignore_unknown\n", |
| 738 | error); |
| 739 | } |
| 740 | else |
| 741 | { |
| 742 | HDEBUG(D_lists) debug_printf("%s %s (%s)\n", ot, |
| 743 | include_unknown? "yes":"no", error); |
| 744 | if (!include_unknown) |
| 745 | { |
| 746 | if ((log_extra_selector & LX_unknown_in_list) != 0) |
| 747 | log_write(0, LOG_MAIN, "list matching forced to fail: %s", error); |
| 748 | return FAIL; |
| 749 | } |
| 750 | log_write(0, LOG_MAIN, "%s: accepted by +include_unknown", error); |
| 751 | return OK; |
| 752 | } |
| 753 | } |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | /* If the item is a file name, we read the file and do a match attempt |
| 758 | on each line in the file, including possibly more negation processing. */ |
| 759 | |
| 760 | else |
| 761 | { |
| 762 | int file_yield = yield; /* In case empty file */ |
| 763 | uschar *filename = ss; |
| 764 | FILE *f = Ufopen(filename, "rb"); |
| 765 | uschar filebuffer[1024]; |
| 766 | |
| 767 | /* ot will be null in non-debugging cases, and anyway, we get better |
| 768 | wording by reworking it. */ |
| 769 | |
| 770 | if (f == NULL) |
| 771 | { |
| 772 | uschar *listname = readconf_find_option(listptr); |
| 773 | if (listname[0] == 0) |
| 774 | listname = string_sprintf("\"%s\"", *listptr); |
| 775 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s", |
| 776 | string_open_failed(errno, "%s when checking %s", sss, listname)); |
| 777 | } |
| 778 | |
| 779 | /* Trailing comments are introduced by #, but in an address list or local |
| 780 | part list, the # must be preceded by white space or the start of the line, |
| 781 | because the # character is a legal character in local parts. */ |
| 782 | |
| 783 | while (Ufgets(filebuffer, sizeof(filebuffer), f) != NULL) |
| 784 | { |
| 785 | uschar *error; |
| 786 | uschar *sss = filebuffer; |
| 787 | |
| 788 | while ((ss = Ustrchr(sss, '#')) != NULL) |
| 789 | { |
| 790 | if ((type != MCL_ADDRESS && type != MCL_LOCALPART) || |
| 791 | ss == filebuffer || isspace(ss[-1])) |
| 792 | { |
| 793 | *ss = 0; |
| 794 | break; |
| 795 | } |
| 796 | sss = ss + 1; |
| 797 | } |
| 798 | |
| 799 | ss = filebuffer + Ustrlen(filebuffer); /* trailing space */ |
| 800 | while (ss > filebuffer && isspace(ss[-1])) ss--; |
| 801 | *ss = 0; |
| 802 | |
| 803 | ss = filebuffer; |
| 804 | while (isspace(*ss)) ss++; /* leading space */ |
| 805 | |
| 806 | if (*ss == 0) continue; /* ignore empty */ |
| 807 | |
| 808 | file_yield = yield; /* positive yield */ |
| 809 | sss = ss; /* for debugging */ |
| 810 | |
| 811 | if (*ss == '!') /* negation */ |
| 812 | { |
| 813 | file_yield = (file_yield == OK)? FAIL : OK; |
| 814 | while (isspace((*(++ss)))); |
| 815 | } |
| 816 | |
| 817 | switch ((func)(arg, ss, valueptr, &error)) |
| 818 | { |
| 819 | case OK: |
| 820 | (void)fclose(f); |
| 821 | HDEBUG(D_lists) debug_printf("%s %s (matched \"%s\" in %s)\n", ot, |
| 822 | (yield == OK)? "yes" : "no", sss, filename); |
| 823 | return file_yield; |
| 824 | |
| 825 | case DEFER: |
| 826 | (void)fclose(f); |
| 827 | goto DEFER_RETURN; |
| 828 | |
| 829 | case ERROR: /* host name lookup failed - this can only */ |
| 830 | if (ignore_unknown) /* be for an incoming host (not outgoing) */ |
| 831 | { |
| 832 | HDEBUG(D_lists) debug_printf("%s: item ignored by +ignore_unknown\n", |
| 833 | error); |
| 834 | } |
| 835 | else |
| 836 | { |
| 837 | HDEBUG(D_lists) debug_printf("%s %s (%s)\n", ot, |
| 838 | include_unknown? "yes":"no", error); |
| 839 | (void)fclose(f); |
| 840 | if (!include_unknown) |
| 841 | { |
| 842 | if ((log_extra_selector & LX_unknown_in_list) != 0) |
| 843 | log_write(0, LOG_MAIN, "list matching forced to fail: %s", error); |
| 844 | return FAIL; |
| 845 | } |
| 846 | log_write(0, LOG_MAIN, "%s: accepted by +include_unknown", error); |
| 847 | return OK; |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | /* At the end of the file, leave the yield setting at the final setting |
| 853 | for the file, in case this is the last item in the list. */ |
| 854 | |
| 855 | yield = file_yield; |
| 856 | (void)fclose(f); |
| 857 | } |
| 858 | } /* Loop for the next item on the top-level list */ |
| 859 | |
| 860 | /* End of list reached: if the last item was negated yield OK, else FAIL. */ |
| 861 | |
| 862 | HDEBUG(D_lists) |
| 863 | debug_printf("%s %s (end of list)\n", ot, (yield == OK)? "no":"yes"); |
| 864 | return (yield == OK)? FAIL : OK; |
| 865 | |
| 866 | /* Something deferred */ |
| 867 | |
| 868 | DEFER_RETURN: |
| 869 | HDEBUG(D_lists) debug_printf("%s list match deferred for %s\n", ot, sss); |
| 870 | return DEFER; |
| 871 | } |
| 872 | |
| 873 | |
| 874 | /************************************************* |
| 875 | * Match in colon-separated list * |
| 876 | *************************************************/ |
| 877 | |
| 878 | /* This function is used for domain lists and local part lists. It is not used |
| 879 | for host lists or address lists, which have additional interpretation of the |
| 880 | patterns. Some calls of it set sep > UCHAR_MAX in order to use its matching |
| 881 | facilities on single items. When this is done, it arranges to set the numerical |
| 882 | variables as a result of the match. |
| 883 | |
| 884 | This function is now just a short interface to match_check_list(), which does |
| 885 | list scanning in a general way. A good compiler will optimize the tail |
| 886 | recursion. |
| 887 | |
| 888 | Arguments: |
| 889 | s string to search for |
| 890 | listptr ptr to ptr to colon separated list of patterns, or NULL |
| 891 | sep a separator value for the list (see string_nextinlist()) |
| 892 | anchorptr ptr to tree for named items, or NULL if no named items |
| 893 | cache_bits ptr to cache_bits for ditto, or NULL if not caching |
| 894 | type MCL_DOMAIN when matching a domain list |
| 895 | MCL_LOCALPART when matching a local part list (address lists |
| 896 | have their own function) |
| 897 | MCL_STRING for others (e.g. list of ciphers) |
| 898 | MCL_NOEXPAND (whose value is greater than any of them) may |
| 899 | be added to any value to suppress expansion of the list |
| 900 | caseless TRUE for (mostly) caseless matching - passed directly to |
| 901 | match_check_string() |
| 902 | valueptr pointer to where any lookup data is to be passed back, |
| 903 | or NULL (just passed on to match_check_string) |
| 904 | |
| 905 | Returns: OK if matched a non-negated item |
| 906 | OK if hit end of list after a negated item |
| 907 | FAIL if expansion force-failed |
| 908 | FAIL if matched a negated item |
| 909 | FAIL if hit end of list after a non-negated item |
| 910 | DEFER if a lookup deferred |
| 911 | */ |
| 912 | |
| 913 | int |
| 914 | match_isinlist(uschar *s, uschar **listptr, int sep, tree_node **anchorptr, |
| 915 | unsigned int *cache_bits, int type, BOOL caseless, uschar **valueptr) |
| 916 | { |
| 917 | unsigned int *local_cache_bits = cache_bits; |
| 918 | check_string_block cb; |
| 919 | cb.origsubject = s; |
| 920 | cb.subject = caseless? string_copylc(s) : string_copy(s); |
| 921 | cb.expand_setup = (sep > UCHAR_MAX)? 0 : -1; |
| 922 | cb.use_partial = TRUE; |
| 923 | cb.caseless = caseless; |
| 924 | cb.at_is_special = (type == MCL_DOMAIN || type == MCL_DOMAIN + MCL_NOEXPAND); |
| 925 | if (valueptr != NULL) *valueptr = NULL; |
| 926 | return match_check_list(listptr, sep, anchorptr, &local_cache_bits, |
| 927 | check_string, &cb, type, s, valueptr); |
| 928 | } |
| 929 | |
| 930 | |
| 931 | |
| 932 | /************************************************* |
| 933 | * Match address to single address-list item * |
| 934 | *************************************************/ |
| 935 | |
| 936 | /* This function matches an address to an item from an address list. It is |
| 937 | called from match_address_list() via match_check_list(). That is why most of |
| 938 | its arguments are in an indirect block. |
| 939 | |
| 940 | Arguments: |
| 941 | arg the argument block (see below) |
| 942 | pattern the pattern to match |
| 943 | valueptr where to return a value |
| 944 | error for error messages (not used in this function; it never |
| 945 | returns ERROR) |
| 946 | |
| 947 | The argument block contains: |
| 948 | address the start of the subject address; when called from retry.c |
| 949 | it may be *@domain if the local part isn't relevant |
| 950 | origaddress the original, un-case-forced address (not used here, but used |
| 951 | in match_check_list() when +caseful is encountered) |
| 952 | expand_setup controls setting up of $n variables |
| 953 | caseless TRUE for caseless local part matching |
| 954 | |
| 955 | Returns: OK for a match |
| 956 | FAIL for no match |
| 957 | DEFER if a lookup deferred |
| 958 | */ |
| 959 | |
| 960 | static int |
| 961 | check_address(void *arg, uschar *pattern, uschar **valueptr, uschar **error) |
| 962 | { |
| 963 | check_address_block *cb = (check_address_block *)arg; |
| 964 | check_string_block csb; |
| 965 | int rc; |
| 966 | int expand_inc = 0; |
| 967 | unsigned int *null = NULL; |
| 968 | uschar *listptr; |
| 969 | uschar *subject = cb->address; |
| 970 | uschar *s, *pdomain, *sdomain; |
| 971 | |
| 972 | error = error; /* Keep clever compilers from complaining */ |
| 973 | |
| 974 | DEBUG(D_lists) debug_printf("address match: subject=%s pattern=%s\n", |
| 975 | subject, pattern); |
| 976 | |
| 977 | /* Find the subject's domain */ |
| 978 | |
| 979 | sdomain = Ustrrchr(subject, '@'); |
| 980 | |
| 981 | /* The only case where a subject may not have a domain is if the subject is |
| 982 | empty. Otherwise, a subject with no domain is a serious configuration error. */ |
| 983 | |
| 984 | if (sdomain == NULL && *subject != 0) |
| 985 | { |
| 986 | log_write(0, LOG_MAIN|LOG_PANIC, "no @ found in the subject of an " |
| 987 | "address list match: subject=\"%s\" pattern=\"%s\"", subject, pattern); |
| 988 | return FAIL; |
| 989 | } |
| 990 | |
| 991 | /* Handle a regular expression, which must match the entire incoming address. |
| 992 | This may be the empty address. */ |
| 993 | |
| 994 | if (*pattern == '^') |
| 995 | return match_check_string(subject, pattern, cb->expand_setup, TRUE, |
| 996 | cb->caseless, FALSE, NULL); |
| 997 | |
| 998 | /* Handle a pattern that is just a lookup. Skip over possible lookup names |
| 999 | (letters, digits, hyphens). Skip over a possible * or *@ at the end. Then we |
| 1000 | must have a semicolon for it to be a lookup. */ |
| 1001 | |
| 1002 | for (s = pattern; isalnum(*s) || *s == '-'; s++); |
| 1003 | if (*s == '*') s++; |
| 1004 | if (*s == '@') s++; |
| 1005 | |
| 1006 | /* If it is a straight lookup, do a lookup for the whole address. This may be |
| 1007 | the empty address. Partial matching doesn't make sense here, so we ignore it, |
| 1008 | but write a panic log entry. However, *@ matching will be honoured. */ |
| 1009 | |
| 1010 | if (*s == ';') |
| 1011 | { |
| 1012 | if (Ustrncmp(pattern, "partial-", 8) == 0) |
| 1013 | log_write(0, LOG_MAIN|LOG_PANIC, "partial matching is not applicable to " |
| 1014 | "whole-address lookups: ignored \"partial-\" in \"%s\"", pattern); |
| 1015 | return match_check_string(subject, pattern, -1, FALSE, cb->caseless, FALSE, |
| 1016 | valueptr); |
| 1017 | } |
| 1018 | |
| 1019 | /* For the remaining cases, an empty subject matches only an empty pattern, |
| 1020 | because other patterns expect to have a local part and a domain to match |
| 1021 | against. */ |
| 1022 | |
| 1023 | if (*subject == 0) return (*pattern == 0)? OK : FAIL; |
| 1024 | |
| 1025 | /* If the pattern starts with "@@" we have a split lookup, where the domain is |
| 1026 | looked up to obtain a list of local parts. If the subject's local part is just |
| 1027 | "*" (called from retry) the match always fails. */ |
| 1028 | |
| 1029 | if (pattern[0] == '@' && pattern[1] == '@') |
| 1030 | { |
| 1031 | int watchdog = 50; |
| 1032 | uschar *list, *key, *ss; |
| 1033 | uschar buffer[1024]; |
| 1034 | |
| 1035 | if (sdomain == subject + 1 && *subject == '*') return FAIL; |
| 1036 | |
| 1037 | /* Loop for handling chains. The last item in any list may be of the form |
| 1038 | ">name" in order to chain on to another list. */ |
| 1039 | |
| 1040 | for (key = sdomain + 1; key != NULL && watchdog-- > 0; ) |
| 1041 | { |
| 1042 | int sep = 0; |
| 1043 | |
| 1044 | if ((rc = match_check_string(key, pattern + 2, -1, TRUE, FALSE, FALSE, |
| 1045 | &list)) != OK) return rc; |
| 1046 | |
| 1047 | /* Check for chaining from the last item; set up the next key if one |
| 1048 | is found. */ |
| 1049 | |
| 1050 | ss = Ustrrchr(list, ':'); |
| 1051 | if (ss == NULL) ss = list; else ss++; |
| 1052 | while (isspace(*ss)) ss++; |
| 1053 | if (*ss == '>') |
| 1054 | { |
| 1055 | *ss++ = 0; |
| 1056 | while (isspace(*ss)) ss++; |
| 1057 | key = string_copy(ss); |
| 1058 | } |
| 1059 | else key = NULL; |
| 1060 | |
| 1061 | /* Look up the local parts provided by the list; negation is permitted. |
| 1062 | If a local part has to begin with !, a regex can be used. */ |
| 1063 | |
| 1064 | while ((ss = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) |
| 1065 | != NULL) |
| 1066 | { |
| 1067 | int local_yield; |
| 1068 | |
| 1069 | if (*ss == '!') |
| 1070 | { |
| 1071 | local_yield = FAIL; |
| 1072 | while (isspace((*(++ss)))); |
| 1073 | } |
| 1074 | else local_yield = OK; |
| 1075 | |
| 1076 | *sdomain = 0; |
| 1077 | rc = match_check_string(subject, ss, -1, TRUE, cb->caseless, FALSE, |
| 1078 | valueptr); |
| 1079 | *sdomain = '@'; |
| 1080 | |
| 1081 | switch(rc) |
| 1082 | { |
| 1083 | case OK: |
| 1084 | return local_yield; |
| 1085 | |
| 1086 | case DEFER: |
| 1087 | return DEFER; |
| 1088 | } |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | /* End of chain loop; panic if too many times */ |
| 1093 | |
| 1094 | if (watchdog <= 0) |
| 1095 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Loop detected in lookup of " |
| 1096 | "local part of %s in %s", subject, pattern); |
| 1097 | |
| 1098 | /* Otherwise the local part check has failed, so the whole match |
| 1099 | fails. */ |
| 1100 | |
| 1101 | return FAIL; |
| 1102 | } |
| 1103 | |
| 1104 | |
| 1105 | /* We get here if the pattern is not a lookup or a regular expression. If it |
| 1106 | contains an @ there is both a local part and a domain. */ |
| 1107 | |
| 1108 | pdomain = Ustrrchr(pattern, '@'); |
| 1109 | if (pdomain != NULL) |
| 1110 | { |
| 1111 | int pllen, sllen; |
| 1112 | |
| 1113 | /* If the domain in the pattern is empty or one of the special cases [] or |
| 1114 | mx_{any,primary,secondary}, and the local part in the pattern ends in "@", |
| 1115 | we have a pattern of the form <something>@@, <something>@@[], or |
| 1116 | <something>@@mx_{any,primary,secondary}. These magic "domains" are |
| 1117 | automatically interpreted in match_check_string. We just need to arrange that |
| 1118 | the leading @ is included in the domain. */ |
| 1119 | |
| 1120 | if (pdomain > pattern && pdomain[-1] == '@' && |
| 1121 | (pdomain[1] == 0 || |
| 1122 | Ustrcmp(pdomain+1, "[]") == 0 || |
| 1123 | Ustrcmp(pdomain+1, "mx_any") == 0 || |
| 1124 | Ustrcmp(pdomain+1, "mx_primary") == 0 || |
| 1125 | Ustrcmp(pdomain+1, "mx_secondary") == 0)) |
| 1126 | pdomain--; |
| 1127 | |
| 1128 | pllen = pdomain - pattern; |
| 1129 | sllen = sdomain - subject; |
| 1130 | |
| 1131 | /* Compare the local parts in the subject and the pattern */ |
| 1132 | |
| 1133 | if (*pattern == '*') |
| 1134 | { |
| 1135 | int cllen = pllen - 1; |
| 1136 | if (sllen < cllen) return FAIL; |
| 1137 | if (cb->caseless) |
| 1138 | { |
| 1139 | if (strncmpic(subject+sllen-cllen, pattern + 1, cllen) != 0) |
| 1140 | return FAIL; |
| 1141 | } |
| 1142 | else |
| 1143 | { |
| 1144 | if (Ustrncmp(subject+sllen-cllen, pattern + 1, cllen) != 0) |
| 1145 | return FAIL; |
| 1146 | } |
| 1147 | if (cb->expand_setup > 0) |
| 1148 | { |
| 1149 | expand_nstring[cb->expand_setup] = subject; |
| 1150 | expand_nlength[cb->expand_setup] = sllen - cllen; |
| 1151 | expand_inc = 1; |
| 1152 | } |
| 1153 | } |
| 1154 | else |
| 1155 | { |
| 1156 | if (sllen != pllen) return FAIL; |
| 1157 | if (cb->caseless) |
| 1158 | { |
| 1159 | if (strncmpic(subject, pattern, sllen) != 0) return FAIL; |
| 1160 | } |
| 1161 | else |
| 1162 | { |
| 1163 | if (Ustrncmp(subject, pattern, sllen) != 0) return FAIL; |
| 1164 | } |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | /* If the local part matched, or was not being checked, check the domain using |
| 1169 | the generalized function, which supports file lookups (which may defer). The |
| 1170 | original code read as follows: |
| 1171 | |
| 1172 | return match_check_string(sdomain + 1, |
| 1173 | (pdomain == NULL)? pattern : pdomain + 1, |
| 1174 | cb->expand_setup + expand_inc, TRUE, cb->caseless, TRUE, NULL); |
| 1175 | |
| 1176 | This supported only literal domains and *.x.y patterns. In order to allow for |
| 1177 | named domain lists (so that you can right, for example, "senders=+xxxx"), it |
| 1178 | was changed to use the list scanning function. */ |
| 1179 | |
| 1180 | csb.origsubject = sdomain + 1; |
| 1181 | csb.subject = (cb->caseless)? string_copylc(sdomain+1) : string_copy(sdomain+1); |
| 1182 | csb.expand_setup = cb->expand_setup + expand_inc; |
| 1183 | csb.use_partial = TRUE; |
| 1184 | csb.caseless = cb->caseless; |
| 1185 | csb.at_is_special = TRUE; |
| 1186 | |
| 1187 | listptr = (pdomain == NULL)? pattern : pdomain + 1; |
| 1188 | if (valueptr != NULL) *valueptr = NULL; |
| 1189 | |
| 1190 | return match_check_list( |
| 1191 | &listptr, /* list of one item */ |
| 1192 | UCHAR_MAX+1, /* impossible separator; single item */ |
| 1193 | &domainlist_anchor, /* it's a domain list */ |
| 1194 | &null, /* ptr to NULL means no caching */ |
| 1195 | check_string, /* the function to do one test */ |
| 1196 | &csb, /* its data */ |
| 1197 | MCL_DOMAIN + MCL_NOEXPAND, /* domain list; don't expand */ |
| 1198 | csb.subject, /* string for messages */ |
| 1199 | valueptr); /* where to pass back lookup data */ |
| 1200 | } |
| 1201 | |
| 1202 | |
| 1203 | |
| 1204 | |
| 1205 | /************************************************* |
| 1206 | * Test whether address matches address list * |
| 1207 | *************************************************/ |
| 1208 | |
| 1209 | /* This function is given an address and a list of things to match it against. |
| 1210 | The list may contain individual addresses, regular expressions, lookup |
| 1211 | specifications, and indirection via bare files. Negation is supported. The |
| 1212 | address to check can consist of just a domain, which will then match only |
| 1213 | domain items or items specified as *@domain. |
| 1214 | |
| 1215 | Domains are always lower cased before the match. Local parts are also lower |
| 1216 | cased unless "caseless" is false. The work of actually scanning the list is |
| 1217 | done by match_check_list(), with an appropriate block of arguments and a |
| 1218 | callback to check_address(). During caseless matching, it will recognize |
| 1219 | +caseful and revert to caseful matching. |
| 1220 | |
| 1221 | Arguments: |
| 1222 | address address to test |
| 1223 | caseless TRUE to start in caseless state |
| 1224 | expand TRUE to allow list expansion |
| 1225 | listptr list to check against |
| 1226 | cache_bits points to cache bits for named address lists, or NULL |
| 1227 | expand_setup controls setting up of $n variables - passed through |
| 1228 | to check_address (q.v.) |
| 1229 | sep separator character for the list; |
| 1230 | may be 0 to get separator from the list; |
| 1231 | may be UCHAR_MAX+1 for one-item list |
| 1232 | valueptr where to return a lookup value, or NULL |
| 1233 | |
| 1234 | Returns: OK for a positive match, or end list after a negation; |
| 1235 | FAIL for a negative match, or end list after non-negation; |
| 1236 | DEFER if a lookup deferred |
| 1237 | */ |
| 1238 | |
| 1239 | int |
| 1240 | match_address_list(uschar *address, BOOL caseless, BOOL expand, |
| 1241 | uschar **listptr, unsigned int *cache_bits, int expand_setup, int sep, |
| 1242 | uschar **valueptr) |
| 1243 | { |
| 1244 | uschar *p; |
| 1245 | check_address_block ab; |
| 1246 | unsigned int *local_cache_bits = cache_bits; |
| 1247 | |
| 1248 | /* RFC 2505 recommends that for spam checking, local parts should be caselessly |
| 1249 | compared. Therefore, Exim now forces the entire address into lower case here, |
| 1250 | provided that "caseless" is set. (It is FALSE for calls for matching rewriting |
| 1251 | patterns.) Otherwise just the domain is lower cases. A magic item "+caseful" in |
| 1252 | the list can be used to restore a caseful copy of the local part from the |
| 1253 | original address. */ |
| 1254 | |
| 1255 | sprintf(CS big_buffer, "%.*s", big_buffer_size - 1, address); |
| 1256 | for (p = big_buffer + Ustrlen(big_buffer) - 1; p >= big_buffer; p--) |
| 1257 | { |
| 1258 | if (!caseless && *p == '@') break; |
| 1259 | *p = tolower(*p); |
| 1260 | } |
| 1261 | |
| 1262 | /* If expand_setup is zero, we need to set up $0 to the whole thing, in |
| 1263 | case there is a match. Can't use the built-in facilities of match_check_string |
| 1264 | (via check_address), as we may just be calling that for part of the address |
| 1265 | (the domain). */ |
| 1266 | |
| 1267 | if (expand_setup == 0) |
| 1268 | { |
| 1269 | expand_nstring[0] = string_copy(address); |
| 1270 | expand_nlength[0] = Ustrlen(address); |
| 1271 | expand_setup++; |
| 1272 | } |
| 1273 | |
| 1274 | /* Set up the data to be passed ultimately to check_address. */ |
| 1275 | |
| 1276 | ab.origaddress = address; |
| 1277 | ab.address = big_buffer; |
| 1278 | ab.expand_setup = expand_setup; |
| 1279 | ab.caseless = caseless; |
| 1280 | |
| 1281 | return match_check_list(listptr, sep, &addresslist_anchor, &local_cache_bits, |
| 1282 | check_address, &ab, MCL_ADDRESS + (expand? 0:MCL_NOEXPAND), address, |
| 1283 | valueptr); |
| 1284 | } |
| 1285 | |
| 1286 | /* End of match.c */ |