| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | /* Functions for parsing addresses */ |
| 9 | |
| 10 | |
| 11 | #include "exim.h" |
| 12 | |
| 13 | |
| 14 | static uschar *last_comment_position; |
| 15 | |
| 16 | |
| 17 | |
| 18 | /* In stand-alone mode, provide a replacement for deliver_make_addr() |
| 19 | and rewrite_address[_qualify]() so as to avoid having to drag in too much |
| 20 | redundant apparatus. */ |
| 21 | |
| 22 | #ifdef STAND_ALONE |
| 23 | |
| 24 | address_item *deliver_make_addr(uschar *address, BOOL copy) |
| 25 | { |
| 26 | address_item *addr = store_get(sizeof(address_item)); |
| 27 | addr->next = NULL; |
| 28 | addr->parent = NULL; |
| 29 | addr->address = address; |
| 30 | return addr; |
| 31 | } |
| 32 | |
| 33 | uschar *rewrite_address(uschar *recipient, BOOL dummy1, BOOL dummy2, rewrite_rule |
| 34 | *dummy3, int dummy4) |
| 35 | { |
| 36 | return recipient; |
| 37 | } |
| 38 | |
| 39 | uschar *rewrite_address_qualify(uschar *recipient, BOOL dummy1) |
| 40 | { |
| 41 | return recipient; |
| 42 | } |
| 43 | |
| 44 | #endif |
| 45 | |
| 46 | |
| 47 | |
| 48 | |
| 49 | /************************************************* |
| 50 | * Find the end of an address * |
| 51 | *************************************************/ |
| 52 | |
| 53 | /* Scan over a string looking for the termination of an address at a comma, |
| 54 | or end of the string. It's the source-routed addresses which cause much pain |
| 55 | here. Although Exim ignores source routes, it must recognize such addresses, so |
| 56 | we cannot get rid of this logic. |
| 57 | |
| 58 | Argument: |
| 59 | s pointer to the start of an address |
| 60 | nl_ends if TRUE, '\n' terminates an address |
| 61 | |
| 62 | Returns: pointer past the end of the address |
| 63 | (i.e. points to null or comma) |
| 64 | */ |
| 65 | |
| 66 | uschar * |
| 67 | parse_find_address_end(uschar *s, BOOL nl_ends) |
| 68 | { |
| 69 | BOOL source_routing = *s == '@'; |
| 70 | int no_term = source_routing? 1 : 0; |
| 71 | |
| 72 | while (*s != 0 && (*s != ',' || no_term > 0) && (*s != '\n' || !nl_ends)) |
| 73 | { |
| 74 | /* Skip single quoted characters. Strictly these should not occur outside |
| 75 | quoted strings in RFC 822 addresses, but they can in RFC 821 addresses. Pity |
| 76 | about the lack of consistency, isn't it? */ |
| 77 | |
| 78 | if (*s == '\\' && s[1] != 0) s += 2; |
| 79 | |
| 80 | /* Skip quoted items that are not inside brackets. Note that |
| 81 | quoted pairs are allowed inside quoted strings. */ |
| 82 | |
| 83 | else if (*s == '\"') |
| 84 | { |
| 85 | while (*(++s) != 0 && (*s != '\n' || !nl_ends)) |
| 86 | { |
| 87 | if (*s == '\\' && s[1] != 0) s++; |
| 88 | else if (*s == '\"') { s++; break; } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /* Skip comments, which may include nested brackets, but quotes |
| 93 | are not recognized inside comments, though quoted pairs are. */ |
| 94 | |
| 95 | else if (*s == '(') |
| 96 | { |
| 97 | int level = 1; |
| 98 | while (*(++s) != 0 && (*s != '\n' || !nl_ends)) |
| 99 | { |
| 100 | if (*s == '\\' && s[1] != 0) s++; |
| 101 | else if (*s == '(') level++; |
| 102 | else if (*s == ')' && --level <= 0) { s++; break; } |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /* Non-special character; just advance. Passing the colon in a source |
| 107 | routed address means that any subsequent comma or colon may terminate unless |
| 108 | inside angle brackets. */ |
| 109 | |
| 110 | else |
| 111 | { |
| 112 | if (*s == '<') |
| 113 | { |
| 114 | source_routing = s[1] == '@'; |
| 115 | no_term = source_routing? 2 : 1; |
| 116 | } |
| 117 | else if (*s == '>') no_term--; |
| 118 | else if (source_routing && *s == ':') no_term--; |
| 119 | s++; |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | return s; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | |
| 128 | /************************************************* |
| 129 | * Find last @ in an address * |
| 130 | *************************************************/ |
| 131 | |
| 132 | /* This function is used when we have something that may not qualified. If we |
| 133 | know it's qualified, searching for the rightmost '@' is sufficient. Here we |
| 134 | have to be a bit more clever than just a plain search, in order to handle |
| 135 | unqualified local parts like "thing@thong" correctly. Since quotes may not |
| 136 | legally be part of a domain name, we can give up on hitting the first quote |
| 137 | when searching from the right. Now that the parsing also permits the RFC 821 |
| 138 | form of address, where quoted-pairs are allowed in unquoted local parts, we |
| 139 | must take care to handle that too. |
| 140 | |
| 141 | Argument: pointer to an address, possibly unqualified |
| 142 | Returns: pointer to the last @ in an address, or NULL if none |
| 143 | */ |
| 144 | |
| 145 | uschar * |
| 146 | parse_find_at(uschar *s) |
| 147 | { |
| 148 | uschar *t = s + Ustrlen(s); |
| 149 | while (--t >= s) |
| 150 | { |
| 151 | if (*t == '@') |
| 152 | { |
| 153 | int backslash_count = 0; |
| 154 | uschar *tt = t - 1; |
| 155 | while (tt > s && *tt-- == '\\') backslash_count++; |
| 156 | if ((backslash_count & 1) == 0) return t; |
| 157 | } |
| 158 | else if (*t == '\"') return NULL; |
| 159 | } |
| 160 | return NULL; |
| 161 | } |
| 162 | |
| 163 | |
| 164 | |
| 165 | |
| 166 | /*************************************************************************** |
| 167 | * In all the functions below that read a particular object type from * |
| 168 | * the input, return the new value of the pointer s (the first argument), * |
| 169 | * and put the object into the store pointed to by t (the second argument), * |
| 170 | * adding a terminating zero. If no object is found, t will point to zero * |
| 171 | * on return. * |
| 172 | ***************************************************************************/ |
| 173 | |
| 174 | |
| 175 | /************************************************* |
| 176 | * Skip white space and comment * |
| 177 | *************************************************/ |
| 178 | |
| 179 | /* Algorithm: |
| 180 | (1) Skip spaces. |
| 181 | (2) If uschar not '(', return. |
| 182 | (3) Skip till matching ')', not counting any characters |
| 183 | escaped with '\'. |
| 184 | (4) Move past ')' and goto (1). |
| 185 | |
| 186 | The start of the last potential comment position is remembered to |
| 187 | make it possible to ignore comments at the end of compound items. |
| 188 | |
| 189 | Argument: current character pointer |
| 190 | Returns: new character pointer |
| 191 | */ |
| 192 | |
| 193 | static uschar * |
| 194 | skip_comment(uschar *s) |
| 195 | { |
| 196 | last_comment_position = s; |
| 197 | while (*s) |
| 198 | { |
| 199 | int c, level; |
| 200 | while (isspace(*s)) s++; |
| 201 | if (*s != '(') break; |
| 202 | level = 1; |
| 203 | while((c = *(++s)) != 0) |
| 204 | { |
| 205 | if (c == '(') level++; |
| 206 | else if (c == ')') { if (--level <= 0) { s++; break; } } |
| 207 | else if (c == '\\' && s[1] != 0) s++; |
| 208 | } |
| 209 | } |
| 210 | return s; |
| 211 | } |
| 212 | |
| 213 | |
| 214 | |
| 215 | /************************************************* |
| 216 | * Read a domain * |
| 217 | *************************************************/ |
| 218 | |
| 219 | /* A domain is a sequence of subdomains, separated by dots. See comments below |
| 220 | for detailed syntax of the subdomains. |
| 221 | |
| 222 | If allow_domain_literals is TRUE, a "domain" may also be an IP address enclosed |
| 223 | in []. Make sure the output is set to the null string if there is a syntax |
| 224 | error as well as if there is no domain at all. |
| 225 | |
| 226 | Arguments: |
| 227 | s current character pointer |
| 228 | t where to put the domain |
| 229 | errorptr put error message here on failure (*t will be 0 on exit) |
| 230 | |
| 231 | Returns: new character pointer |
| 232 | */ |
| 233 | |
| 234 | static uschar * |
| 235 | read_domain(uschar *s, uschar *t, uschar **errorptr) |
| 236 | { |
| 237 | uschar *tt = t; |
| 238 | s = skip_comment(s); |
| 239 | |
| 240 | /* Handle domain literals if permitted. An RFC 822 domain literal may contain |
| 241 | any character except [ ] \, including linear white space, and may contain |
| 242 | quoted characters. However, RFC 821 restricts literals to being dot-separated |
| 243 | 3-digit numbers, and we make the obvious extension for IPv6. Go for a sequence |
| 244 | of digits, dots, hex digits, and colons here; later this will be checked for |
| 245 | being a syntactically valid IP address if it ever gets to a router. |
| 246 | |
| 247 | Allow both the formal IPv6 form, with IPV6: at the start, and the informal form |
| 248 | without it, and accept IPV4: as well, 'cause someone will use it sooner or |
| 249 | later. */ |
| 250 | |
| 251 | if (*s == '[') |
| 252 | { |
| 253 | *t++ = *s++; |
| 254 | |
| 255 | if (strncmpic(s, US"IPv6:", 5) == 0 || strncmpic(s, US"IPv4:", 5) == 0) |
| 256 | { |
| 257 | memcpy(t, s, 5); |
| 258 | t += 5; |
| 259 | s += 5; |
| 260 | } |
| 261 | while (*s == '.' || *s == ':' || isxdigit(*s)) *t++ = *s++; |
| 262 | |
| 263 | if (*s == ']') *t++ = *s++; else |
| 264 | { |
| 265 | *errorptr = US"malformed domain literal"; |
| 266 | *tt = 0; |
| 267 | } |
| 268 | |
| 269 | if (!allow_domain_literals) |
| 270 | { |
| 271 | *errorptr = US"domain literals not allowed"; |
| 272 | *tt = 0; |
| 273 | } |
| 274 | *t = 0; |
| 275 | return skip_comment(s); |
| 276 | } |
| 277 | |
| 278 | /* Handle a proper domain, which is a sequence of dot-separated atoms. Remove |
| 279 | trailing dots if strip_trailing_dot is set. A subdomain is an atom. |
| 280 | |
| 281 | An atom is a sequence of any characters except specials, space, and controls. |
| 282 | The specials are ( ) < > @ , ; : \ " . [ and ]. This is the rule for RFC 822 |
| 283 | and its successor (RFC 2822). However, RFC 821 and its successor (RFC 2821) is |
| 284 | tighter, allowing only letters, digits, and hyphens, not starting with a |
| 285 | hyphen. |
| 286 | |
| 287 | There used to be a global flag that got set when checking addresses that came |
| 288 | in over SMTP and which should therefore should be checked according to the |
| 289 | stricter rule. However, it seems silly to make the distinction, because I don't |
| 290 | suppose anybody ever uses local domains that are 822-compliant and not |
| 291 | 821-compliant. Furthermore, Exim now has additional data on the spool file line |
| 292 | after an address (after "one_time" processing), and it makes use of a # |
| 293 | character to delimit it. When I wrote that code, I forgot about this 822-domain |
| 294 | stuff, and assumed # could never appear in a domain. |
| 295 | |
| 296 | So the old code is now cut out for Release 4.11 onwards, on 09-Aug-02. In a few |
| 297 | years, when we are sure this isn't actually causing trouble, throw it away. |
| 298 | |
| 299 | March 2003: the story continues: There is a camp that is arguing for the use of |
| 300 | UTF-8 in domain names as the way to internationalization, and other MTAs |
| 301 | support this. Therefore, we now have a flag that permits the use of characters |
| 302 | with values greater than 127, encoded in UTF-8, in subdomains, so that Exim can |
| 303 | be used experimentally in this way. */ |
| 304 | |
| 305 | for (;;) |
| 306 | { |
| 307 | uschar *tsave = t; |
| 308 | |
| 309 | /********************* |
| 310 | if (rfc821_domains) |
| 311 | { |
| 312 | if (*s != '-') while (isalnum(*s) || *s == '-') *t++ = *s++; |
| 313 | } |
| 314 | else |
| 315 | while (!mac_iscntrl_or_special(*s)) *t++ = *s++; |
| 316 | *********************/ |
| 317 | |
| 318 | if (*s != '-') |
| 319 | { |
| 320 | /* Only letters, digits, and hyphens */ |
| 321 | |
| 322 | if (!allow_utf8_domains) |
| 323 | { |
| 324 | while (isalnum(*s) || *s == '-') *t++ = *s++; |
| 325 | } |
| 326 | |
| 327 | /* Permit legal UTF-8 characters to be included */ |
| 328 | |
| 329 | else for(;;) |
| 330 | { |
| 331 | int i, d; |
| 332 | if (isalnum(*s) || *s == '-') /* legal ascii characters */ |
| 333 | { |
| 334 | *t++ = *s++; |
| 335 | continue; |
| 336 | } |
| 337 | if ((*s & 0xc0) != 0xc0) break; /* not start of UTF-8 character */ |
| 338 | d = *s << 2; |
| 339 | for (i = 1; i < 6; i++) /* i is the number of additional bytes */ |
| 340 | { |
| 341 | if ((d & 0x80) == 0) break; |
| 342 | d <<= 1; |
| 343 | } |
| 344 | if (i == 6) goto BAD_UTF8; /* invalid UTF-8 */ |
| 345 | *t++ = *s++; /* leading UTF-8 byte */ |
| 346 | while (i-- > 0) /* copy and check remainder */ |
| 347 | { |
| 348 | if ((*s & 0xc0) != 0x80) |
| 349 | { |
| 350 | BAD_UTF8: |
| 351 | *errorptr = US"invalid UTF-8 byte sequence"; |
| 352 | *tt = 0; |
| 353 | return s; |
| 354 | } |
| 355 | *t++ = *s++; |
| 356 | } |
| 357 | } /* End of loop for UTF-8 character */ |
| 358 | } /* End of subdomain */ |
| 359 | |
| 360 | s = skip_comment(s); |
| 361 | *t = 0; |
| 362 | |
| 363 | if (t == tsave) /* empty component */ |
| 364 | { |
| 365 | if (strip_trailing_dot && t > tt && *s != '.') t[-1] = 0; else |
| 366 | { |
| 367 | *errorptr = US"domain missing or malformed"; |
| 368 | *tt = 0; |
| 369 | } |
| 370 | return s; |
| 371 | } |
| 372 | |
| 373 | if (*s != '.') break; |
| 374 | *t++ = *s++; |
| 375 | s = skip_comment(s); |
| 376 | } |
| 377 | |
| 378 | return s; |
| 379 | } |
| 380 | |
| 381 | |
| 382 | |
| 383 | /************************************************* |
| 384 | * Read a local-part * |
| 385 | *************************************************/ |
| 386 | |
| 387 | /* A local-part is a sequence of words, separated by periods. A null word |
| 388 | between dots is not strictly allowed but apparently many mailers permit it, |
| 389 | so, sigh, better be compatible. Even accept a trailing dot... |
| 390 | |
| 391 | A <word> is either a quoted string, or an <atom>, which is a sequence |
| 392 | of any characters except specials, space, and controls. The specials are |
| 393 | ( ) < > @ , ; : \ " . [ and ]. In RFC 822, a single quoted character, (a |
| 394 | quoted-pair) is not allowed in a word. However, in RFC 821, it is permitted in |
| 395 | the local part of an address. Rather than have separate parsing functions for |
| 396 | the different cases, take the liberal attitude always. At least one MUA is |
| 397 | happy to recognize this case; I don't know how many other programs do. |
| 398 | |
| 399 | Arguments: |
| 400 | s current character pointer |
| 401 | t where to put the local part |
| 402 | error where to point error text |
| 403 | allow_null TRUE if an empty local part is not an error |
| 404 | |
| 405 | Returns: new character pointer |
| 406 | */ |
| 407 | |
| 408 | static uschar * |
| 409 | read_local_part(uschar *s, uschar *t, uschar **error, BOOL allow_null) |
| 410 | { |
| 411 | uschar *tt = t; |
| 412 | *error = NULL; |
| 413 | for (;;) |
| 414 | { |
| 415 | int c; |
| 416 | uschar *tsave = t; |
| 417 | s = skip_comment(s); |
| 418 | |
| 419 | /* Handle a quoted string */ |
| 420 | |
| 421 | if (*s == '\"') |
| 422 | { |
| 423 | *t++ = '\"'; |
| 424 | while ((c = *(++s)) != 0 && c != '\"') |
| 425 | { |
| 426 | *t++ = c; |
| 427 | if (c == '\\' && s[1] != 0) *t++ = *(++s); |
| 428 | } |
| 429 | if (c == '\"') |
| 430 | { |
| 431 | s++; |
| 432 | *t++ = '\"'; |
| 433 | } |
| 434 | else |
| 435 | { |
| 436 | *error = US"unmatched doublequote in local part"; |
| 437 | return s; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /* Handle an atom, but allow quoted pairs within it. */ |
| 442 | |
| 443 | else while (!mac_iscntrl_or_special(*s) || *s == '\\') |
| 444 | { |
| 445 | c = *t++ = *s++; |
| 446 | if (c == '\\' && *s != 0) *t++ = *s++; |
| 447 | } |
| 448 | |
| 449 | /* Terminate the word and skip subsequent comment */ |
| 450 | |
| 451 | *t = 0; |
| 452 | s = skip_comment(s); |
| 453 | |
| 454 | /* If we have read a null component at this point, give an error unless it is |
| 455 | terminated by a dot - an extension to RFC 822 - or if it is the first |
| 456 | component of the local part and an empty local part is permitted, in which |
| 457 | case just return normally. */ |
| 458 | |
| 459 | if (t == tsave && *s != '.') |
| 460 | { |
| 461 | if (t == tt && !allow_null) |
| 462 | *error = US"missing or malformed local part"; |
| 463 | return s; |
| 464 | } |
| 465 | |
| 466 | /* Anything other than a dot terminates the local part. Treat multiple dots |
| 467 | as a single dot, as this seems to be a common extension. */ |
| 468 | |
| 469 | if (*s != '.') break; |
| 470 | do { *t++ = *s++; } while (*s == '.'); |
| 471 | } |
| 472 | |
| 473 | return s; |
| 474 | } |
| 475 | |
| 476 | |
| 477 | /************************************************* |
| 478 | * Read route part of route-addr * |
| 479 | *************************************************/ |
| 480 | |
| 481 | /* The pointer is at the initial "@" on entry. Return it following the |
| 482 | terminating colon. Exim no longer supports the use of source routes, but it is |
| 483 | required to accept the syntax. |
| 484 | |
| 485 | Arguments: |
| 486 | s current character pointer |
| 487 | t where to put the route |
| 488 | errorptr where to put an error message |
| 489 | |
| 490 | Returns: new character pointer |
| 491 | */ |
| 492 | |
| 493 | static uschar * |
| 494 | read_route(uschar *s, uschar *t, uschar **errorptr) |
| 495 | { |
| 496 | BOOL commas = FALSE; |
| 497 | *errorptr = NULL; |
| 498 | |
| 499 | while (*s == '@') |
| 500 | { |
| 501 | *t++ = '@'; |
| 502 | s = read_domain(s+1, t, errorptr); |
| 503 | if (*t == 0) return s; |
| 504 | t += Ustrlen((const uschar *)t); |
| 505 | if (*s != ',') break; |
| 506 | *t++ = *s++; |
| 507 | commas = TRUE; |
| 508 | s = skip_comment(s); |
| 509 | } |
| 510 | |
| 511 | if (*s == ':') *t++ = *s++; |
| 512 | |
| 513 | /* If there is no colon, and there were no commas, the most likely error |
| 514 | is in fact a missing local part in the address rather than a missing colon |
| 515 | after the route. */ |
| 516 | |
| 517 | else *errorptr = commas? |
| 518 | US"colon expected after route list" : |
| 519 | US"no local part"; |
| 520 | |
| 521 | /* Terminate the route and return */ |
| 522 | |
| 523 | *t = 0; |
| 524 | return skip_comment(s); |
| 525 | } |
| 526 | |
| 527 | |
| 528 | |
| 529 | /************************************************* |
| 530 | * Read addr-spec * |
| 531 | *************************************************/ |
| 532 | |
| 533 | /* Addr-spec is local-part@domain. We make the domain optional - |
| 534 | the expected terminator for the whole thing is passed to check this. |
| 535 | This function is called only when we know we have a route-addr. |
| 536 | |
| 537 | Arguments: |
| 538 | s current character pointer |
| 539 | t where to put the addr-spec |
| 540 | term expected terminator (0 or >) |
| 541 | errorptr where to put an error message |
| 542 | domainptr set to point to the start of the domain |
| 543 | |
| 544 | Returns: new character pointer |
| 545 | */ |
| 546 | |
| 547 | static uschar * |
| 548 | read_addr_spec(uschar *s, uschar *t, int term, uschar **errorptr, |
| 549 | uschar **domainptr) |
| 550 | { |
| 551 | s = read_local_part(s, t, errorptr, FALSE); |
| 552 | if (*errorptr == NULL) |
| 553 | if (*s != term) |
| 554 | if (*s != '@') |
| 555 | *errorptr = string_sprintf("\"@\" or \".\" expected after \"%s\"", t); |
| 556 | else |
| 557 | { |
| 558 | t += Ustrlen((const uschar *)t); |
| 559 | *t++ = *s++; |
| 560 | *domainptr = t; |
| 561 | s = read_domain(s, t, errorptr); |
| 562 | } |
| 563 | return s; |
| 564 | } |
| 565 | |
| 566 | |
| 567 | |
| 568 | /************************************************* |
| 569 | * Extract operative address * |
| 570 | *************************************************/ |
| 571 | |
| 572 | /* This function extracts an operative address from a full RFC822 mailbox and |
| 573 | returns it in a piece of dynamic store. We take the easy way and get a piece |
| 574 | of store the same size as the input, and then copy into it whatever is |
| 575 | necessary. If we cannot find a valid address (syntax error), return NULL, and |
| 576 | point the error pointer to the reason. The arguments "start" and "end" are used |
| 577 | to return the offsets of the first and one past the last characters in the |
| 578 | original mailbox of the address that has been extracted, to aid in re-writing. |
| 579 | The argument "domain" is set to point to the first character after "@" in the |
| 580 | final part of the returned address, or zero if there is no @. |
| 581 | |
| 582 | Exim no longer supports the use of source routed addresses (those of the form |
| 583 | @domain,...:route_addr). It recognizes the syntax, but collapses such addresses |
| 584 | down to their final components. Formerly, collapse_source_routes had to be set |
| 585 | to achieve this effect. RFC 1123 allows collapsing with MAY, while the revision |
| 586 | of RFC 821 had increased this to SHOULD, so I've gone for it, because it makes |
| 587 | a lot of code elsewhere in Exim much simpler. |
| 588 | |
| 589 | There are some special fudges here for handling RFC 822 group address notation |
| 590 | which may appear in certain headers. If the flag parse_allow_group is set |
| 591 | TRUE and parse_found_group is FALSE when this function is called, an address |
| 592 | which is the start of a group (i.e. preceded by a phrase and a colon) is |
| 593 | recognized; the phrase is ignored and the flag parse_found_group is set. If |
| 594 | this flag is TRUE at the end of an address, and if an extraneous semicolon is |
| 595 | found, it is ignored and the flag is cleared. |
| 596 | |
| 597 | This logic is used only when scanning through addresses in headers, either to |
| 598 | fulfil the -t option, or for rewriting, or for checking header syntax. Because |
| 599 | the group "state" has to be remembered between multiple calls of this function, |
| 600 | the variables parse_{allow,found}_group are global. It is important to ensure |
| 601 | that they are reset to FALSE at the end of scanning a header's list of |
| 602 | addresses. |
| 603 | |
| 604 | Arguments: |
| 605 | mailbox points to the RFC822 mailbox |
| 606 | errorptr where to point an error message |
| 607 | start set to start offset in mailbox |
| 608 | end set to end offset in mailbox |
| 609 | domain set to domain offset in result, or 0 if no domain present |
| 610 | allow_null allow <> if TRUE |
| 611 | |
| 612 | Returns: points to the extracted address, or NULL on error |
| 613 | */ |
| 614 | |
| 615 | #define FAILED(s) { *errorptr = s; goto PARSE_FAILED; } |
| 616 | |
| 617 | uschar * |
| 618 | parse_extract_address(uschar *mailbox, uschar **errorptr, int *start, int *end, |
| 619 | int *domain, BOOL allow_null) |
| 620 | { |
| 621 | uschar *yield = store_get(Ustrlen(mailbox) + 1); |
| 622 | uschar *startptr, *endptr; |
| 623 | uschar *s = (uschar *)mailbox; |
| 624 | uschar *t = (uschar *)yield; |
| 625 | |
| 626 | *domain = 0; |
| 627 | |
| 628 | /* At the start of the string we expect either an addr-spec or a phrase |
| 629 | preceding a <route-addr>. If groups are allowed, we might also find a phrase |
| 630 | preceding a colon and an address. If we find an initial word followed by |
| 631 | a dot, strict interpretation of the RFC would cause it to be taken |
| 632 | as the start of an addr-spec. However, many mailers break the rules |
| 633 | and use addresses of the form "a.n.other <ano@somewhere>" and so we |
| 634 | allow this case. */ |
| 635 | |
| 636 | RESTART: /* Come back here after passing a group name */ |
| 637 | |
| 638 | s = skip_comment(s); |
| 639 | startptr = s; /* In case addr-spec */ |
| 640 | s = read_local_part(s, t, errorptr, TRUE); /* Dot separated words */ |
| 641 | if (*errorptr != NULL) goto PARSE_FAILED; |
| 642 | |
| 643 | /* If the terminator is neither < nor @ then the format of the address |
| 644 | must either be a bare local-part (we are now at the end), or a phrase |
| 645 | followed by a route-addr (more words must follow). */ |
| 646 | |
| 647 | if (*s != '@' && *s != '<') |
| 648 | { |
| 649 | if (*s == 0 || *s == ';') |
| 650 | { |
| 651 | if (*t == 0) FAILED(US"empty address"); |
| 652 | endptr = last_comment_position; |
| 653 | goto PARSE_SUCCEEDED; /* Bare local part */ |
| 654 | } |
| 655 | |
| 656 | /* Expect phrase route-addr, or phrase : if groups permitted, but allow |
| 657 | dots in the phrase; complete the loop only when '<' or ':' is encountered - |
| 658 | end of string will produce a null local_part and therefore fail. We don't |
| 659 | need to keep updating t, as the phrase isn't to be kept. */ |
| 660 | |
| 661 | while (*s != '<' && (!parse_allow_group || *s != ':')) |
| 662 | { |
| 663 | s = read_local_part(s, t, errorptr, FALSE); |
| 664 | if (*errorptr) |
| 665 | { |
| 666 | *errorptr = string_sprintf("%s (expected word or \"<\")", *errorptr); |
| 667 | goto PARSE_FAILED; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | if (*s == ':') |
| 672 | { |
| 673 | parse_found_group = TRUE; |
| 674 | parse_allow_group = FALSE; |
| 675 | s++; |
| 676 | goto RESTART; |
| 677 | } |
| 678 | |
| 679 | /* Assert *s == '<' */ |
| 680 | } |
| 681 | |
| 682 | /* At this point the next character is either '@' or '<'. If it is '@', only a |
| 683 | single local-part has previously been read. An angle bracket signifies the |
| 684 | start of an <addr-spec>. Throw away anything we have saved so far before |
| 685 | processing it. Note that this is "if" rather than "else if" because it's also |
| 686 | used after reading a preceding phrase. |
| 687 | |
| 688 | There are a lot of broken sendmails out there that put additional pairs of <> |
| 689 | round <route-addr>s. If strip_excess_angle_brackets is set, allow a limited |
| 690 | number of them, as long as they match. */ |
| 691 | |
| 692 | if (*s == '<') |
| 693 | { |
| 694 | uschar *domainptr = yield; |
| 695 | BOOL source_routed = FALSE; |
| 696 | int bracket_count = 1; |
| 697 | |
| 698 | s++; |
| 699 | if (strip_excess_angle_brackets) while (*s == '<') |
| 700 | { |
| 701 | if(bracket_count++ > 5) FAILED(US"angle-brackets nested too deep"); |
| 702 | s++; |
| 703 | } |
| 704 | |
| 705 | t = yield; |
| 706 | startptr = s; |
| 707 | s = skip_comment(s); |
| 708 | |
| 709 | /* Read an optional series of routes, each of which is a domain. They |
| 710 | are separated by commas and terminated by a colon. However, we totally ignore |
| 711 | such routes (RFC 1123 says we MAY, and the revision of RFC 821 says we |
| 712 | SHOULD). */ |
| 713 | |
| 714 | if (*s == '@') |
| 715 | { |
| 716 | s = read_route(s, t, errorptr); |
| 717 | if (*errorptr) goto PARSE_FAILED; |
| 718 | *t = 0; /* Ensure route is ignored - probably overkill */ |
| 719 | source_routed = TRUE; |
| 720 | } |
| 721 | |
| 722 | /* Now an addr-spec, terminated by '>'. If there is no preceding route, |
| 723 | we must allow an empty addr-spec if allow_null is TRUE, to permit the |
| 724 | address "<>" in some circumstances. A source-routed address MUST have |
| 725 | a domain in the final part. */ |
| 726 | |
| 727 | if (allow_null && !source_routed && *s == '>') |
| 728 | { |
| 729 | *t = 0; |
| 730 | *errorptr = NULL; |
| 731 | } |
| 732 | else |
| 733 | { |
| 734 | s = read_addr_spec(s, t, '>', errorptr, &domainptr); |
| 735 | if (*errorptr) goto PARSE_FAILED; |
| 736 | *domain = domainptr - yield; |
| 737 | if (source_routed && *domain == 0) |
| 738 | FAILED(US"domain missing in source-routed address"); |
| 739 | } |
| 740 | |
| 741 | endptr = s; |
| 742 | if (*errorptr != NULL) goto PARSE_FAILED; |
| 743 | while (bracket_count-- > 0) if (*s++ != '>') |
| 744 | { |
| 745 | *errorptr = s[-1] == 0 |
| 746 | ? US"'>' missing at end of address" |
| 747 | : string_sprintf("malformed address: %.32s may not follow %.*s", |
| 748 | s-1, s - (uschar *)mailbox - 1, mailbox); |
| 749 | goto PARSE_FAILED; |
| 750 | } |
| 751 | |
| 752 | s = skip_comment(s); |
| 753 | } |
| 754 | |
| 755 | /* Hitting '@' after the first local-part means we have definitely got an |
| 756 | addr-spec, on a strict reading of the RFC, and the rest of the string |
| 757 | should be the domain. However, for flexibility we allow for a route-address |
| 758 | not enclosed in <> as well, which is indicated by an empty first local |
| 759 | part preceding '@'. The source routing is, however, ignored. */ |
| 760 | |
| 761 | else if (*t == 0) |
| 762 | { |
| 763 | uschar *domainptr = yield; |
| 764 | s = read_route(s, t, errorptr); |
| 765 | if (*errorptr != NULL) goto PARSE_FAILED; |
| 766 | *t = 0; /* Ensure route is ignored - probably overkill */ |
| 767 | s = read_addr_spec(s, t, 0, errorptr, &domainptr); |
| 768 | if (*errorptr != NULL) goto PARSE_FAILED; |
| 769 | *domain = domainptr - yield; |
| 770 | endptr = last_comment_position; |
| 771 | if (*domain == 0) FAILED(US"domain missing in source-routed address"); |
| 772 | } |
| 773 | |
| 774 | /* This is the strict case of local-part@domain. */ |
| 775 | |
| 776 | else |
| 777 | { |
| 778 | t += Ustrlen((const uschar *)t); |
| 779 | *t++ = *s++; |
| 780 | *domain = t - yield; |
| 781 | s = read_domain(s, t, errorptr); |
| 782 | if (*t == 0) goto PARSE_FAILED; |
| 783 | endptr = last_comment_position; |
| 784 | } |
| 785 | |
| 786 | /* Use goto to get here from the bare local part case. Arrive by falling |
| 787 | through for other cases. Endptr may have been moved over whitespace, so |
| 788 | move it back past white space if necessary. */ |
| 789 | |
| 790 | PARSE_SUCCEEDED: |
| 791 | if (*s != 0) |
| 792 | { |
| 793 | if (parse_found_group && *s == ';') |
| 794 | { |
| 795 | parse_found_group = FALSE; |
| 796 | parse_allow_group = TRUE; |
| 797 | } |
| 798 | else |
| 799 | { |
| 800 | *errorptr = string_sprintf("malformed address: %.32s may not follow %.*s", |
| 801 | s, s - (uschar *)mailbox, mailbox); |
| 802 | goto PARSE_FAILED; |
| 803 | } |
| 804 | } |
| 805 | *start = startptr - (uschar *)mailbox; /* Return offsets */ |
| 806 | while (isspace(endptr[-1])) endptr--; |
| 807 | *end = endptr - (uschar *)mailbox; |
| 808 | |
| 809 | /* Although this code has no limitation on the length of address extracted, |
| 810 | other parts of Exim may have limits, and in any case, RFC 2821 limits local |
| 811 | parts to 64 and domains to 255, so we do a check here, giving an error if the |
| 812 | address is ridiculously long. */ |
| 813 | |
| 814 | if (*end - *start > ADDRESS_MAXLENGTH) |
| 815 | { |
| 816 | *errorptr = string_sprintf("address is ridiculously long: %.64s...", yield); |
| 817 | return NULL; |
| 818 | } |
| 819 | |
| 820 | return yield; |
| 821 | |
| 822 | /* Use goto (via the macro FAILED) to get to here from a variety of places. |
| 823 | We might have an empty address in a group - the caller can choose to ignore |
| 824 | this. We must, however, keep the flags correct. */ |
| 825 | |
| 826 | PARSE_FAILED: |
| 827 | if (parse_found_group && *s == ';') |
| 828 | { |
| 829 | parse_found_group = FALSE; |
| 830 | parse_allow_group = TRUE; |
| 831 | } |
| 832 | return NULL; |
| 833 | } |
| 834 | |
| 835 | #undef FAILED |
| 836 | |
| 837 | |
| 838 | |
| 839 | /************************************************* |
| 840 | * Quote according to RFC 2047 * |
| 841 | *************************************************/ |
| 842 | |
| 843 | /* This function is used for quoting text in headers according to RFC 2047. |
| 844 | If the only characters that strictly need quoting are spaces, we return the |
| 845 | original string, unmodified. If a quoted string is too long for the buffer, it |
| 846 | is truncated. (This shouldn't happen: this is normally handling short strings.) |
| 847 | |
| 848 | Hmmph. As always, things get perverted for other uses. This function was |
| 849 | originally for the "phrase" part of addresses. Now it is being used for much |
| 850 | longer texts in ACLs and via the ${rfc2047: expansion item. This means we have |
| 851 | to check for overlong "encoded-word"s and split them. November 2004. |
| 852 | |
| 853 | Arguments: |
| 854 | string the string to quote - already checked to contain non-printing |
| 855 | chars |
| 856 | len the length of the string |
| 857 | charset the name of the character set; NULL => iso-8859-1 |
| 858 | buffer the buffer to put the answer in |
| 859 | buffer_size the size of the buffer |
| 860 | fold if TRUE, a newline is inserted before the separating space when |
| 861 | more than one encoded-word is generated |
| 862 | |
| 863 | Returns: pointer to the original string, if no quoting needed, or |
| 864 | pointer to buffer containing the quoted string, or |
| 865 | a pointer to "String too long" if the buffer can't even hold |
| 866 | the introduction |
| 867 | */ |
| 868 | |
| 869 | const uschar * |
| 870 | parse_quote_2047(const uschar *string, int len, uschar *charset, uschar *buffer, |
| 871 | int buffer_size, BOOL fold) |
| 872 | { |
| 873 | const uschar *s = string; |
| 874 | uschar *p, *t; |
| 875 | int hlen; |
| 876 | BOOL coded = FALSE; |
| 877 | BOOL first_byte = FALSE; |
| 878 | |
| 879 | if (charset == NULL) charset = US"iso-8859-1"; |
| 880 | |
| 881 | /* We don't expect this to fail! */ |
| 882 | |
| 883 | if (!string_format(buffer, buffer_size, "=?%s?Q?", charset)) |
| 884 | return US"String too long"; |
| 885 | |
| 886 | hlen = Ustrlen(buffer); |
| 887 | t = buffer + hlen; |
| 888 | p = buffer; |
| 889 | |
| 890 | for (; len > 0; len--) |
| 891 | { |
| 892 | int ch = *s++; |
| 893 | if (t > buffer + buffer_size - hlen - 8) break; |
| 894 | |
| 895 | if ((t - p > 67) && !first_byte) |
| 896 | { |
| 897 | *t++ = '?'; |
| 898 | *t++ = '='; |
| 899 | if (fold) *t++ = '\n'; |
| 900 | *t++ = ' '; |
| 901 | p = t; |
| 902 | Ustrncpy(p, buffer, hlen); |
| 903 | t += hlen; |
| 904 | } |
| 905 | |
| 906 | if (ch < 33 || ch > 126 || |
| 907 | Ustrchr("?=()<>@,;:\\\".[]_", ch) != NULL) |
| 908 | { |
| 909 | if (ch == ' ') |
| 910 | { |
| 911 | *t++ = '_'; |
| 912 | first_byte = FALSE; |
| 913 | } |
| 914 | else |
| 915 | { |
| 916 | sprintf(CS t, "=%02X", ch); |
| 917 | while (*t != 0) t++; |
| 918 | coded = TRUE; |
| 919 | first_byte = !first_byte; |
| 920 | } |
| 921 | } |
| 922 | else { *t++ = ch; first_byte = FALSE; } |
| 923 | } |
| 924 | |
| 925 | *t++ = '?'; |
| 926 | *t++ = '='; |
| 927 | *t = 0; |
| 928 | |
| 929 | return coded? buffer : string; |
| 930 | } |
| 931 | |
| 932 | |
| 933 | |
| 934 | |
| 935 | /************************************************* |
| 936 | * Fix up an RFC 822 "phrase" * |
| 937 | *************************************************/ |
| 938 | |
| 939 | /* This function is called to repair any syntactic defects in the "phrase" part |
| 940 | of an RFC822 address. In particular, it is applied to the user's name as read |
| 941 | from the passwd file when accepting a local message, and to the data from the |
| 942 | -F option. |
| 943 | |
| 944 | If the string contains existing quoted strings or comments containing |
| 945 | freestanding quotes, then we just quote those bits that need quoting - |
| 946 | otherwise it would get awfully messy and probably not look good. If not, we |
| 947 | quote the whole thing if necessary. Thus |
| 948 | |
| 949 | John Q. Smith => "John Q. Smith" |
| 950 | John "Jack" Smith => John "Jack" Smith |
| 951 | John "Jack" Q. Smith => John "Jack" "Q." Smith |
| 952 | John (Jack) Q. Smith => "John (Jack) Q. Smith" |
| 953 | John ("Jack") Q. Smith => John ("Jack") "Q." Smith |
| 954 | but |
| 955 | John (\"Jack\") Q. Smith => "John (\"Jack\") Q. Smith" |
| 956 | |
| 957 | Sheesh! This is tedious code. It is a great pity that the syntax of RFC822 is |
| 958 | the way it is... |
| 959 | |
| 960 | August 2000: Additional code added: |
| 961 | |
| 962 | Previously, non-printing characters were turned into question marks, which do |
| 963 | not need to be quoted. |
| 964 | |
| 965 | Now, a different tactic is used if there are any non-printing ASCII |
| 966 | characters. The encoding method from RFC 2047 is used, assuming iso-8859-1 as |
| 967 | the character set. |
| 968 | |
| 969 | We *could* use this for all cases, getting rid of the messy original code, |
| 970 | but leave it for now. It would complicate simple cases like "John Q. Smith". |
| 971 | |
| 972 | The result is passed back in the buffer; it is usually going to be added to |
| 973 | some other string. In order to be sure there is going to be no overflow, |
| 974 | restrict the length of the input to 1/4 of the buffer size - this allows for |
| 975 | every single character to be quoted or encoded without overflowing, and that |
| 976 | wouldn't happen because of amalgamation. If the phrase is too long, return a |
| 977 | fixed string. |
| 978 | |
| 979 | Arguments: |
| 980 | phrase an RFC822 phrase |
| 981 | len the length of the phrase |
| 982 | buffer a buffer to put the result in |
| 983 | buffer_size the size of the buffer |
| 984 | |
| 985 | Returns: the fixed RFC822 phrase |
| 986 | */ |
| 987 | |
| 988 | const uschar * |
| 989 | parse_fix_phrase(const uschar *phrase, int len, uschar *buffer, int buffer_size) |
| 990 | { |
| 991 | int ch, i; |
| 992 | BOOL quoted = FALSE; |
| 993 | const uschar *s, *end; |
| 994 | uschar *t, *yield; |
| 995 | |
| 996 | while (len > 0 && isspace(*phrase)) { phrase++; len--; } |
| 997 | if (len > buffer_size/4) return US"Name too long"; |
| 998 | |
| 999 | /* See if there are any non-printing characters, and if so, use the RFC 2047 |
| 1000 | encoding for the whole thing. */ |
| 1001 | |
| 1002 | for (i = 0, s = phrase; i < len; i++, s++) |
| 1003 | if ((*s < 32 && *s != '\t') || *s > 126) break; |
| 1004 | |
| 1005 | if (i < len) return parse_quote_2047(phrase, len, headers_charset, buffer, |
| 1006 | buffer_size, FALSE); |
| 1007 | |
| 1008 | /* No non-printers; use the RFC 822 quoting rules */ |
| 1009 | |
| 1010 | s = phrase; |
| 1011 | end = s + len; |
| 1012 | yield = t = buffer + 1; |
| 1013 | |
| 1014 | while (s < end) |
| 1015 | { |
| 1016 | ch = *s++; |
| 1017 | |
| 1018 | /* Copy over quoted strings, remembering we encountered one */ |
| 1019 | |
| 1020 | if (ch == '\"') |
| 1021 | { |
| 1022 | *t++ = '\"'; |
| 1023 | while (s < end && (ch = *s++) != '\"') |
| 1024 | { |
| 1025 | *t++ = ch; |
| 1026 | if (ch == '\\' && s < end) *t++ = *s++; |
| 1027 | } |
| 1028 | *t++ = '\"'; |
| 1029 | if (s >= end) break; |
| 1030 | quoted = TRUE; |
| 1031 | } |
| 1032 | |
| 1033 | /* Copy over comments, noting if they contain freestanding quote |
| 1034 | characters */ |
| 1035 | |
| 1036 | else if (ch == '(') |
| 1037 | { |
| 1038 | int level = 1; |
| 1039 | *t++ = '('; |
| 1040 | while (s < end) |
| 1041 | { |
| 1042 | ch = *s++; |
| 1043 | *t++ = ch; |
| 1044 | if (ch == '(') level++; |
| 1045 | else if (ch == ')') { if (--level <= 0) break; } |
| 1046 | else if (ch == '\\' && s < end) *t++ = *s++ & 127; |
| 1047 | else if (ch == '\"') quoted = TRUE; |
| 1048 | } |
| 1049 | if (ch == 0) |
| 1050 | { |
| 1051 | while (level--) *t++ = ')'; |
| 1052 | break; |
| 1053 | } |
| 1054 | } |
| 1055 | |
| 1056 | /* Handle special characters that need to be quoted */ |
| 1057 | |
| 1058 | else if (Ustrchr(")<>@,;:\\.[]", ch) != NULL) |
| 1059 | { |
| 1060 | /* If hit previous quotes just make one quoted "word" */ |
| 1061 | |
| 1062 | if (quoted) |
| 1063 | { |
| 1064 | uschar *tt = t++; |
| 1065 | while (*(--tt) != ' ' && *tt != '\"' && *tt != ')') tt[1] = *tt; |
| 1066 | tt[1] = '\"'; |
| 1067 | *t++ = ch; |
| 1068 | while (s < end) |
| 1069 | { |
| 1070 | ch = *s++; |
| 1071 | if (ch == ' ' || ch == '\"') { s--; break; } else *t++ = ch; |
| 1072 | } |
| 1073 | *t++ = '\"'; |
| 1074 | } |
| 1075 | |
| 1076 | /* Else quote the whole string so far, and the rest up to any following |
| 1077 | quotes. We must treat anything following a backslash as a literal. */ |
| 1078 | |
| 1079 | else |
| 1080 | { |
| 1081 | BOOL escaped = (ch == '\\'); |
| 1082 | *(--yield) = '\"'; |
| 1083 | *t++ = ch; |
| 1084 | |
| 1085 | /* Now look for the end or a quote */ |
| 1086 | |
| 1087 | while (s < end) |
| 1088 | { |
| 1089 | ch = *s++; |
| 1090 | |
| 1091 | /* Handle escaped pairs */ |
| 1092 | |
| 1093 | if (escaped) |
| 1094 | { |
| 1095 | *t++ = ch; |
| 1096 | escaped = FALSE; |
| 1097 | } |
| 1098 | |
| 1099 | else if (ch == '\\') |
| 1100 | { |
| 1101 | *t++ = ch; |
| 1102 | escaped = TRUE; |
| 1103 | } |
| 1104 | |
| 1105 | /* If hit subsequent quotes, insert our quote before any trailing |
| 1106 | spaces and back up to re-handle the quote in the outer loop. */ |
| 1107 | |
| 1108 | else if (ch == '\"') |
| 1109 | { |
| 1110 | int count = 0; |
| 1111 | while (t[-1] == ' ') { t--; count++; } |
| 1112 | *t++ = '\"'; |
| 1113 | while (count-- > 0) *t++ = ' '; |
| 1114 | s--; |
| 1115 | break; |
| 1116 | } |
| 1117 | |
| 1118 | /* If hit a subsequent comment, check it for unescaped quotes, |
| 1119 | and if so, end our quote before it. */ |
| 1120 | |
| 1121 | else if (ch == '(') |
| 1122 | { |
| 1123 | const uschar *ss = s; /* uschar after '(' */ |
| 1124 | int level = 1; |
| 1125 | while(ss < end) |
| 1126 | { |
| 1127 | ch = *ss++; |
| 1128 | if (ch == '(') level++; |
| 1129 | else if (ch == ')') { if (--level <= 0) break; } |
| 1130 | else if (ch == '\\' && ss+1 < end) ss++; |
| 1131 | else if (ch == '\"') { quoted = TRUE; break; } |
| 1132 | } |
| 1133 | |
| 1134 | /* Comment contains unescaped quotes; end our quote before |
| 1135 | the start of the comment. */ |
| 1136 | |
| 1137 | if (quoted) |
| 1138 | { |
| 1139 | int count = 0; |
| 1140 | while (t[-1] == ' ') { t--; count++; } |
| 1141 | *t++ = '\"'; |
| 1142 | while (count-- > 0) *t++ = ' '; |
| 1143 | break; |
| 1144 | } |
| 1145 | |
| 1146 | /* Comment does not contain unescaped quotes; include it in |
| 1147 | our quote. */ |
| 1148 | |
| 1149 | else |
| 1150 | { |
| 1151 | if (ss >= end) ss--; |
| 1152 | *t++ = '('; |
| 1153 | Ustrncpy(t, s, ss-s); |
| 1154 | t += ss-s; |
| 1155 | s = ss; |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | /* Not a comment or quote; include this character in our quotes. */ |
| 1160 | |
| 1161 | else *t++ = ch; |
| 1162 | } |
| 1163 | } |
| 1164 | |
| 1165 | /* Add a final quote if we hit the end of the string. */ |
| 1166 | |
| 1167 | if (s >= end) *t++ = '\"'; |
| 1168 | } |
| 1169 | |
| 1170 | /* Non-special character; just copy it over */ |
| 1171 | |
| 1172 | else *t++ = ch; |
| 1173 | } |
| 1174 | |
| 1175 | *t = 0; |
| 1176 | return yield; |
| 1177 | } |
| 1178 | |
| 1179 | |
| 1180 | /************************************************* |
| 1181 | * Extract addresses from a list * |
| 1182 | *************************************************/ |
| 1183 | |
| 1184 | /* This function is called by the redirect router to scan a string containing a |
| 1185 | list of addresses separated by commas (with optional white space) or by |
| 1186 | newlines, and to generate a chain of address items from them. In other words, |
| 1187 | to unpick data from an alias or .forward file. |
| 1188 | |
| 1189 | The SunOS5 documentation for alias files is not very clear on the syntax; it |
| 1190 | does not say that either a comma or a newline can be used for separation. |
| 1191 | However, that is the way Smail does it, so we follow suit. |
| 1192 | |
| 1193 | If a # character is encountered in a white space position, then characters from |
| 1194 | there to the next newline are skipped. |
| 1195 | |
| 1196 | If an unqualified address begins with '\', just skip that character. This gives |
| 1197 | compatibility with Sendmail's use of \ to prevent looping. Exim has its own |
| 1198 | loop prevention scheme which handles other cases too - see the code in |
| 1199 | route_address(). |
| 1200 | |
| 1201 | An "address" can be a specification of a file or a pipe; the latter may often |
| 1202 | need to be quoted because it may contain spaces, but we don't want to retain |
| 1203 | the quotes. Quotes may appear in normal addresses too, and should be retained. |
| 1204 | We can distinguish between these cases, because in addresses, quotes are used |
| 1205 | only for parts of the address, not the whole thing. Therefore, we remove quotes |
| 1206 | from items when they entirely enclose them, but not otherwise. |
| 1207 | |
| 1208 | An "address" can also be of the form :include:pathname to include a list of |
| 1209 | addresses contained in the specified file. |
| 1210 | |
| 1211 | Any unqualified addresses are qualified with and rewritten if necessary, via |
| 1212 | the rewrite_address() function. |
| 1213 | |
| 1214 | Arguments: |
| 1215 | s the list of addresses (typically a complete |
| 1216 | .forward file or a list of entries in an alias file) |
| 1217 | options option bits for permitting or denying various special cases; |
| 1218 | not all bits are relevant here - some are for filter |
| 1219 | files; those we use here are: |
| 1220 | RDO_DEFER |
| 1221 | RDO_FREEZE |
| 1222 | RDO_FAIL |
| 1223 | RDO_BLACKHOLE |
| 1224 | RDO_REWRITE |
| 1225 | RDO_INCLUDE |
| 1226 | anchor where to hang the chain of newly-created addresses. This |
| 1227 | should be initialized to NULL. |
| 1228 | error where to return an error text |
| 1229 | incoming domain domain of the incoming address; used to qualify unqualified |
| 1230 | local parts preceded by \ |
| 1231 | directory if NULL, no checks are done on :include: files |
| 1232 | otherwise, included file names must start with the given |
| 1233 | directory |
| 1234 | syntax_errors if not NULL, it carries on after syntax errors in addresses, |
| 1235 | building up a list of errors as error blocks chained on |
| 1236 | here. |
| 1237 | |
| 1238 | Returns: FF_DELIVERED addresses extracted |
| 1239 | FF_NOTDELIVERED no addresses extracted, but no errors |
| 1240 | FF_BLACKHOLE :blackhole: |
| 1241 | FF_DEFER :defer: |
| 1242 | FF_FAIL :fail: |
| 1243 | FF_INCLUDEFAIL some problem with :include:; *error set |
| 1244 | FF_ERROR other problems; *error is set |
| 1245 | */ |
| 1246 | |
| 1247 | int |
| 1248 | parse_forward_list(uschar *s, int options, address_item **anchor, |
| 1249 | uschar **error, const uschar *incoming_domain, uschar *directory, |
| 1250 | error_block **syntax_errors) |
| 1251 | { |
| 1252 | int count = 0; |
| 1253 | |
| 1254 | DEBUG(D_route) debug_printf("parse_forward_list: %s\n", s); |
| 1255 | |
| 1256 | for (;;) |
| 1257 | { |
| 1258 | int len; |
| 1259 | int special = 0; |
| 1260 | int specopt = 0; |
| 1261 | int specbit = 0; |
| 1262 | uschar *ss, *nexts; |
| 1263 | address_item *addr; |
| 1264 | BOOL inquote = FALSE; |
| 1265 | |
| 1266 | for (;;) |
| 1267 | { |
| 1268 | while (isspace(*s) || *s == ',') s++; |
| 1269 | if (*s == '#') { while (*s != 0 && *s != '\n') s++; } else break; |
| 1270 | } |
| 1271 | |
| 1272 | /* When we reach the end of the list, we return FF_DELIVERED if any child |
| 1273 | addresses have been generated. If nothing has been generated, there are two |
| 1274 | possibilities: either the list is really empty, or there were syntax errors |
| 1275 | that are being skipped. (If syntax errors are not being skipped, an FF_ERROR |
| 1276 | return is generated on hitting a syntax error and we don't get here.) For a |
| 1277 | truly empty list we return FF_NOTDELIVERED so that the router can decline. |
| 1278 | However, if the list is empty only because syntax errors were skipped, we |
| 1279 | return FF_DELIVERED. */ |
| 1280 | |
| 1281 | if (*s == 0) |
| 1282 | { |
| 1283 | return (count > 0 || (syntax_errors != NULL && *syntax_errors != NULL))? |
| 1284 | FF_DELIVERED : FF_NOTDELIVERED; |
| 1285 | |
| 1286 | /* This previous code returns FF_ERROR if nothing is generated but a |
| 1287 | syntax error has been skipped. I now think it is the wrong approach, but |
| 1288 | have left this here just in case, and for the record. */ |
| 1289 | |
| 1290 | #ifdef NEVER |
| 1291 | if (count > 0) return FF_DELIVERED; /* Something was generated */ |
| 1292 | |
| 1293 | if (syntax_errors == NULL || /* Not skipping syntax errors, or */ |
| 1294 | *syntax_errors == NULL) /* we didn't actually skip any */ |
| 1295 | return FF_NOTDELIVERED; |
| 1296 | |
| 1297 | *error = string_sprintf("no addresses generated: syntax error in %s: %s", |
| 1298 | (*syntax_errors)->text2, (*syntax_errors)->text1); |
| 1299 | return FF_ERROR; |
| 1300 | #endif |
| 1301 | |
| 1302 | } |
| 1303 | |
| 1304 | /* Find the end of the next address. Quoted strings in addresses may contain |
| 1305 | escaped characters; I haven't found a proper specification of .forward or |
| 1306 | alias files that mentions the quoting properties, but it seems right to do |
| 1307 | the escaping thing in all cases, so use the function that finds the end of an |
| 1308 | address. However, don't let a quoted string extend over the end of a line. */ |
| 1309 | |
| 1310 | ss = parse_find_address_end(s, TRUE); |
| 1311 | |
| 1312 | /* Remember where we finished, for starting the next one. */ |
| 1313 | |
| 1314 | nexts = ss; |
| 1315 | |
| 1316 | /* Remove any trailing spaces; we know there's at least one non-space. */ |
| 1317 | |
| 1318 | while (isspace((ss[-1]))) ss--; |
| 1319 | |
| 1320 | /* We now have s->start and ss->end of the next address. Remove quotes |
| 1321 | if they completely enclose, remembering the address started with a quote |
| 1322 | for handling pipes and files. Another round of removal of leading and |
| 1323 | trailing spaces is then required. */ |
| 1324 | |
| 1325 | if (*s == '\"' && ss[-1] == '\"') |
| 1326 | { |
| 1327 | s++; |
| 1328 | ss--; |
| 1329 | inquote = TRUE; |
| 1330 | while (s < ss && isspace(*s)) s++; |
| 1331 | while (ss > s && isspace((ss[-1]))) ss--; |
| 1332 | } |
| 1333 | |
| 1334 | /* Set up the length of the address. */ |
| 1335 | |
| 1336 | len = ss - s; |
| 1337 | |
| 1338 | DEBUG(D_route) |
| 1339 | { |
| 1340 | int save = s[len]; |
| 1341 | s[len] = 0; |
| 1342 | debug_printf("extract item: %s\n", s); |
| 1343 | s[len] = save; |
| 1344 | } |
| 1345 | |
| 1346 | /* Handle special addresses if permitted. If the address is :unknown: |
| 1347 | ignore it - this is for backward compatibility with old alias files. You |
| 1348 | don't need to use it nowadays - just generate an empty string. For :defer:, |
| 1349 | :blackhole:, or :fail: we have to set up the error message and give up right |
| 1350 | away. */ |
| 1351 | |
| 1352 | if (Ustrncmp(s, ":unknown:", len) == 0) |
| 1353 | { |
| 1354 | s = nexts; |
| 1355 | continue; |
| 1356 | } |
| 1357 | |
| 1358 | if (Ustrncmp(s, ":defer:", 7) == 0) |
| 1359 | { special = FF_DEFER; specopt = RDO_DEFER; } /* specbit is 0 */ |
| 1360 | else if (Ustrncmp(s, ":blackhole:", 11) == 0) |
| 1361 | { special = FF_BLACKHOLE; specopt = specbit = RDO_BLACKHOLE; } |
| 1362 | else if (Ustrncmp(s, ":fail:", 6) == 0) |
| 1363 | { special = FF_FAIL; specopt = RDO_FAIL; } /* specbit is 0 */ |
| 1364 | |
| 1365 | if (special != 0) |
| 1366 | { |
| 1367 | uschar *ss = Ustrchr(s+1, ':') + 1; |
| 1368 | if ((options & specopt) == specbit) |
| 1369 | { |
| 1370 | *error = string_sprintf("\"%.*s\" is not permitted", len, s); |
| 1371 | return FF_ERROR; |
| 1372 | } |
| 1373 | while (*ss != 0 && isspace(*ss)) ss++; |
| 1374 | while (s[len] != 0 && s[len] != '\n') len++; |
| 1375 | s[len] = 0; |
| 1376 | *error = string_copy(ss); |
| 1377 | return special; |
| 1378 | } |
| 1379 | |
| 1380 | /* If the address is of the form :include:pathname, read the file, and call |
| 1381 | this function recursively to extract the addresses from it. If directory is |
| 1382 | NULL, do no checks. Otherwise, insist that the file name starts with the |
| 1383 | given directory and is a regular file. */ |
| 1384 | |
| 1385 | if (Ustrncmp(s, ":include:", 9) == 0) |
| 1386 | { |
| 1387 | uschar *filebuf; |
| 1388 | uschar filename[256]; |
| 1389 | uschar *t = s+9; |
| 1390 | int flen = len - 9; |
| 1391 | int frc; |
| 1392 | struct stat statbuf; |
| 1393 | address_item *last; |
| 1394 | FILE *f; |
| 1395 | |
| 1396 | while (flen > 0 && isspace(*t)) { t++; flen--; } |
| 1397 | |
| 1398 | if (flen <= 0) |
| 1399 | { |
| 1400 | *error = string_sprintf("file name missing after :include:"); |
| 1401 | return FF_ERROR; |
| 1402 | } |
| 1403 | |
| 1404 | if (flen > 255) |
| 1405 | { |
| 1406 | *error = string_sprintf("included file name \"%s\" is too long", t); |
| 1407 | return FF_ERROR; |
| 1408 | } |
| 1409 | |
| 1410 | Ustrncpy(filename, t, flen); |
| 1411 | filename[flen] = 0; |
| 1412 | |
| 1413 | /* Insist on absolute path */ |
| 1414 | |
| 1415 | if (filename[0]!= '/') |
| 1416 | { |
| 1417 | *error = string_sprintf("included file \"%s\" is not an absolute path", |
| 1418 | filename); |
| 1419 | return FF_ERROR; |
| 1420 | } |
| 1421 | |
| 1422 | /* Check if include is permitted */ |
| 1423 | |
| 1424 | if ((options & RDO_INCLUDE) != 0) |
| 1425 | { |
| 1426 | *error = US"included files not permitted"; |
| 1427 | return FF_ERROR; |
| 1428 | } |
| 1429 | |
| 1430 | /* Check file name if required */ |
| 1431 | |
| 1432 | if (directory) |
| 1433 | { |
| 1434 | int len = Ustrlen(directory); |
| 1435 | uschar *p = filename + len; |
| 1436 | |
| 1437 | if (Ustrncmp(filename, directory, len) != 0 || *p != '/') |
| 1438 | { |
| 1439 | *error = string_sprintf("included file %s is not in directory %s", |
| 1440 | filename, directory); |
| 1441 | return FF_ERROR; |
| 1442 | } |
| 1443 | |
| 1444 | #ifdef EXIM_HAVE_OPENAT |
| 1445 | /* It is necessary to check that every component inside the directory |
| 1446 | is NOT a symbolic link, in order to keep the file inside the directory. |
| 1447 | This is mighty tedious. We open the directory and openat every component, |
| 1448 | with a flag that fails symlinks. */ |
| 1449 | |
| 1450 | { |
| 1451 | int fd = open(CS directory, O_RDONLY); |
| 1452 | if (fd < 0) |
| 1453 | { |
| 1454 | *error = string_sprintf("failed to open directory %s", directory); |
| 1455 | return FF_ERROR; |
| 1456 | } |
| 1457 | while (*p) |
| 1458 | { |
| 1459 | uschar temp; |
| 1460 | int fd2; |
| 1461 | uschar * q = p; |
| 1462 | |
| 1463 | while (*++p && *p != '/') ; |
| 1464 | temp = *p; |
| 1465 | *p = '\0'; |
| 1466 | |
| 1467 | fd2 = openat(fd, CS q, O_RDONLY|O_NOFOLLOW); |
| 1468 | close(fd); |
| 1469 | *p = temp; |
| 1470 | if (fd2 < 0) |
| 1471 | { |
| 1472 | *error = string_sprintf("failed to open %s (component of included " |
| 1473 | "file); could be symbolic link", filename); |
| 1474 | return FF_ERROR; |
| 1475 | } |
| 1476 | fd = fd2; |
| 1477 | } |
| 1478 | f = fdopen(fd, "rb"); |
| 1479 | } |
| 1480 | #else |
| 1481 | /* It is necessary to check that every component inside the directory |
| 1482 | is NOT a symbolic link, in order to keep the file inside the directory. |
| 1483 | This is mighty tedious. It is also not totally foolproof in that it |
| 1484 | leaves the possibility of a race attack, but I don't know how to do |
| 1485 | any better. */ |
| 1486 | |
| 1487 | while (*p) |
| 1488 | { |
| 1489 | int temp; |
| 1490 | while (*++p && *p != '/'); |
| 1491 | temp = *p; |
| 1492 | *p = 0; |
| 1493 | if (Ulstat(filename, &statbuf) != 0) |
| 1494 | { |
| 1495 | *error = string_sprintf("failed to stat %s (component of included " |
| 1496 | "file)", filename); |
| 1497 | *p = temp; |
| 1498 | return FF_ERROR; |
| 1499 | } |
| 1500 | |
| 1501 | *p = temp; |
| 1502 | |
| 1503 | if ((statbuf.st_mode & S_IFMT) == S_IFLNK) |
| 1504 | { |
| 1505 | *error = string_sprintf("included file %s in the %s directory " |
| 1506 | "involves a symbolic link", filename, directory); |
| 1507 | return FF_ERROR; |
| 1508 | } |
| 1509 | } |
| 1510 | #endif |
| 1511 | } |
| 1512 | |
| 1513 | #ifdef EXIM_HAVE_OPENAT |
| 1514 | else |
| 1515 | #endif |
| 1516 | /* Open and stat the file */ |
| 1517 | f = Ufopen(filename, "rb"); |
| 1518 | |
| 1519 | if (!f) |
| 1520 | { |
| 1521 | *error = string_open_failed(errno, "included file %s", filename); |
| 1522 | return FF_INCLUDEFAIL; |
| 1523 | } |
| 1524 | |
| 1525 | if (fstat(fileno(f), &statbuf) != 0) |
| 1526 | { |
| 1527 | *error = string_sprintf("failed to stat included file %s: %s", |
| 1528 | filename, strerror(errno)); |
| 1529 | (void)fclose(f); |
| 1530 | return FF_INCLUDEFAIL; |
| 1531 | } |
| 1532 | |
| 1533 | /* If directory was checked, double check that we opened a regular file */ |
| 1534 | |
| 1535 | if (directory && (statbuf.st_mode & S_IFMT) != S_IFREG) |
| 1536 | { |
| 1537 | *error = string_sprintf("included file %s is not a regular file in " |
| 1538 | "the %s directory", filename, directory); |
| 1539 | return FF_ERROR; |
| 1540 | } |
| 1541 | |
| 1542 | /* Get a buffer and read the contents */ |
| 1543 | |
| 1544 | if (statbuf.st_size > MAX_INCLUDE_SIZE) |
| 1545 | { |
| 1546 | *error = string_sprintf("included file %s is too big (max %d)", |
| 1547 | filename, MAX_INCLUDE_SIZE); |
| 1548 | return FF_ERROR; |
| 1549 | } |
| 1550 | |
| 1551 | filebuf = store_get(statbuf.st_size + 1); |
| 1552 | if (fread(filebuf, 1, statbuf.st_size, f) != statbuf.st_size) |
| 1553 | { |
| 1554 | *error = string_sprintf("error while reading included file %s: %s", |
| 1555 | filename, strerror(errno)); |
| 1556 | (void)fclose(f); |
| 1557 | return FF_ERROR; |
| 1558 | } |
| 1559 | filebuf[statbuf.st_size] = 0; |
| 1560 | (void)fclose(f); |
| 1561 | |
| 1562 | addr = NULL; |
| 1563 | frc = parse_forward_list(filebuf, options, &addr, |
| 1564 | error, incoming_domain, directory, syntax_errors); |
| 1565 | if (frc != FF_DELIVERED && frc != FF_NOTDELIVERED) return frc; |
| 1566 | |
| 1567 | if (addr) |
| 1568 | { |
| 1569 | for (last = addr; last->next; last = last->next) count++; |
| 1570 | last->next = *anchor; |
| 1571 | *anchor = addr; |
| 1572 | count++; |
| 1573 | } |
| 1574 | } |
| 1575 | |
| 1576 | /* Else (not :include:) ensure address is syntactically correct and fully |
| 1577 | qualified if not a pipe or a file, removing a leading \ if present on an |
| 1578 | unqualified address. For pipes and files we must handle quoting. It's |
| 1579 | not quite clear exactly what to do for partially quoted things, but the |
| 1580 | common case of having the whole thing in quotes is straightforward. If this |
| 1581 | was the case, inquote will have been set TRUE above and the quotes removed. |
| 1582 | |
| 1583 | There is a possible ambiguity over addresses whose local parts start with |
| 1584 | a vertical bar or a slash, and the latter do in fact occur, thanks to X.400. |
| 1585 | Consider a .forward file that contains the line |
| 1586 | |
| 1587 | /X=xxx/Y=xxx/OU=xxx/@some.gate.way |
| 1588 | |
| 1589 | Is this a file or an X.400 address? Does it make any difference if it is in |
| 1590 | quotes? On the grounds that file names of this type are rare, Exim treats |
| 1591 | something that parses as an RFC 822 address and has a domain as an address |
| 1592 | rather than a file or a pipe. This is also how an address such as the above |
| 1593 | would be treated if it came in from outside. */ |
| 1594 | |
| 1595 | else |
| 1596 | { |
| 1597 | int start, end, domain; |
| 1598 | uschar *recipient = NULL; |
| 1599 | int save = s[len]; |
| 1600 | s[len] = 0; |
| 1601 | |
| 1602 | /* If it starts with \ and the rest of it parses as a valid mail address |
| 1603 | without a domain, carry on with that address, but qualify it with the |
| 1604 | incoming domain. Otherwise arrange for the address to fall through, |
| 1605 | causing an error message on the re-parse. */ |
| 1606 | |
| 1607 | if (*s == '\\') |
| 1608 | { |
| 1609 | recipient = |
| 1610 | parse_extract_address(s+1, error, &start, &end, &domain, FALSE); |
| 1611 | if (recipient != NULL) |
| 1612 | recipient = (domain != 0)? NULL : |
| 1613 | string_sprintf("%s@%s", recipient, incoming_domain); |
| 1614 | } |
| 1615 | |
| 1616 | /* Try parsing the item as an address. */ |
| 1617 | |
| 1618 | if (recipient == NULL) recipient = |
| 1619 | parse_extract_address(s, error, &start, &end, &domain, FALSE); |
| 1620 | |
| 1621 | /* If item starts with / or | and is not a valid address, or there |
| 1622 | is no domain, treat it as a file or pipe. If it was a quoted item, |
| 1623 | remove the quoting occurrences of \ within it. */ |
| 1624 | |
| 1625 | if ((*s == '|' || *s == '/') && (recipient == NULL || domain == 0)) |
| 1626 | { |
| 1627 | uschar *t = store_get(Ustrlen(s) + 1); |
| 1628 | uschar *p = t; |
| 1629 | uschar *q = s; |
| 1630 | while (*q != 0) |
| 1631 | { |
| 1632 | if (inquote) |
| 1633 | { |
| 1634 | *p++ = (*q == '\\')? *(++q) : *q; |
| 1635 | q++; |
| 1636 | } |
| 1637 | else *p++ = *q++; |
| 1638 | } |
| 1639 | *p = 0; |
| 1640 | addr = deliver_make_addr(t, TRUE); |
| 1641 | setflag(addr, af_pfr); /* indicates pipe/file/reply */ |
| 1642 | if (*s != '|') setflag(addr, af_file); /* indicates file */ |
| 1643 | } |
| 1644 | |
| 1645 | /* Item must be an address. Complain if not, else qualify, rewrite and set |
| 1646 | up the control block. It appears that people are in the habit of using |
| 1647 | empty addresses but with comments as a way of putting comments into |
| 1648 | alias and forward files. Therefore, ignore the error "empty address". |
| 1649 | Mailing lists might want to tolerate syntax errors; there is therefore |
| 1650 | an option to do so. */ |
| 1651 | |
| 1652 | else |
| 1653 | { |
| 1654 | if (recipient == NULL) |
| 1655 | { |
| 1656 | if (Ustrcmp(*error, "empty address") == 0) |
| 1657 | { |
| 1658 | *error = NULL; |
| 1659 | s[len] = save; |
| 1660 | s = nexts; |
| 1661 | continue; |
| 1662 | } |
| 1663 | |
| 1664 | if (syntax_errors != NULL) |
| 1665 | { |
| 1666 | error_block *e = store_get(sizeof(error_block)); |
| 1667 | error_block *last = *syntax_errors; |
| 1668 | if (last == NULL) *syntax_errors = e; else |
| 1669 | { |
| 1670 | while (last->next != NULL) last = last->next; |
| 1671 | last->next = e; |
| 1672 | } |
| 1673 | e->next = NULL; |
| 1674 | e->text1 = *error; |
| 1675 | e->text2 = string_copy(s); |
| 1676 | s[len] = save; |
| 1677 | s = nexts; |
| 1678 | continue; |
| 1679 | } |
| 1680 | else |
| 1681 | { |
| 1682 | *error = string_sprintf("%s in \"%s\"", *error, s); |
| 1683 | s[len] = save; /* _after_ using it for *error */ |
| 1684 | return FF_ERROR; |
| 1685 | } |
| 1686 | } |
| 1687 | |
| 1688 | /* Address was successfully parsed. Rewrite, and then make an address |
| 1689 | block. */ |
| 1690 | |
| 1691 | recipient = ((options & RDO_REWRITE) != 0)? |
| 1692 | rewrite_address(recipient, TRUE, FALSE, global_rewrite_rules, |
| 1693 | rewrite_existflags) : |
| 1694 | rewrite_address_qualify(recipient, TRUE); |
| 1695 | addr = deliver_make_addr(recipient, TRUE); /* TRUE => copy recipient */ |
| 1696 | } |
| 1697 | |
| 1698 | /* Restore the final character in the original data, and add to the |
| 1699 | output chain. */ |
| 1700 | |
| 1701 | s[len] = save; |
| 1702 | addr->next = *anchor; |
| 1703 | *anchor = addr; |
| 1704 | count++; |
| 1705 | } |
| 1706 | |
| 1707 | /* Advance pointer for the next address */ |
| 1708 | |
| 1709 | s = nexts; |
| 1710 | } |
| 1711 | } |
| 1712 | |
| 1713 | |
| 1714 | /************************************************* |
| 1715 | * Extract a Message-ID * |
| 1716 | *************************************************/ |
| 1717 | |
| 1718 | /* This function is used to extract message ids from In-Reply-To: and |
| 1719 | References: header lines. |
| 1720 | |
| 1721 | Arguments: |
| 1722 | str pointer to the start of the message-id |
| 1723 | yield put pointer to the message id (in dynamic memory) here |
| 1724 | error put error message here on failure |
| 1725 | |
| 1726 | Returns: points after the processed message-id or NULL on error |
| 1727 | */ |
| 1728 | |
| 1729 | uschar * |
| 1730 | parse_message_id(uschar *str, uschar **yield, uschar **error) |
| 1731 | { |
| 1732 | uschar *domain = NULL; |
| 1733 | uschar *id; |
| 1734 | |
| 1735 | str = skip_comment(str); |
| 1736 | if (*str != '<') |
| 1737 | { |
| 1738 | *error = US"Missing '<' before message-id"; |
| 1739 | return NULL; |
| 1740 | } |
| 1741 | |
| 1742 | /* Getting a block the size of the input string will definitely be sufficient |
| 1743 | for the answer, but it may also be very long if we are processing a header |
| 1744 | line. Therefore, take care to release unwanted store afterwards. */ |
| 1745 | |
| 1746 | id = *yield = store_get(Ustrlen(str) + 1); |
| 1747 | *id++ = *str++; |
| 1748 | |
| 1749 | str = read_addr_spec(str, id, '>', error, &domain); |
| 1750 | |
| 1751 | if (*error == NULL) |
| 1752 | { |
| 1753 | if (*str != '>') *error = US"Missing '>' after message-id"; |
| 1754 | else if (domain == NULL) *error = US"domain missing in message-id"; |
| 1755 | } |
| 1756 | |
| 1757 | if (*error != NULL) |
| 1758 | { |
| 1759 | store_reset(*yield); |
| 1760 | return NULL; |
| 1761 | } |
| 1762 | |
| 1763 | while (*id != 0) id++; |
| 1764 | *id++ = *str++; |
| 1765 | *id++ = 0; |
| 1766 | store_reset(id); |
| 1767 | |
| 1768 | str = skip_comment(str); |
| 1769 | return str; |
| 1770 | } |
| 1771 | |
| 1772 | |
| 1773 | /************************************************* |
| 1774 | * Parse a fixed digit number * |
| 1775 | *************************************************/ |
| 1776 | |
| 1777 | /* Parse a string containing an ASCII encoded fixed digits number |
| 1778 | |
| 1779 | Arguments: |
| 1780 | str pointer to the start of the ASCII encoded number |
| 1781 | n pointer to the resulting value |
| 1782 | digits number of required digits |
| 1783 | |
| 1784 | Returns: points after the processed date or NULL on error |
| 1785 | */ |
| 1786 | |
| 1787 | static uschar * |
| 1788 | parse_number(uschar *str, int *n, int digits) |
| 1789 | { |
| 1790 | *n=0; |
| 1791 | while (digits--) |
| 1792 | { |
| 1793 | if (*str<'0' || *str>'9') return NULL; |
| 1794 | *n=10*(*n)+(*str++-'0'); |
| 1795 | } |
| 1796 | return str; |
| 1797 | } |
| 1798 | |
| 1799 | |
| 1800 | /************************************************* |
| 1801 | * Parse a RFC 2822 day of week * |
| 1802 | *************************************************/ |
| 1803 | |
| 1804 | /* Parse the day of the week from a RFC 2822 date, but do not |
| 1805 | decode it, because it is only for humans. |
| 1806 | |
| 1807 | Arguments: |
| 1808 | str pointer to the start of the day of the week |
| 1809 | |
| 1810 | Returns: points after the parsed day or NULL on error |
| 1811 | */ |
| 1812 | |
| 1813 | static uschar * |
| 1814 | parse_day_of_week(uschar *str) |
| 1815 | { |
| 1816 | /* |
| 1817 | day-of-week = ([FWS] day-name) / obs-day-of-week |
| 1818 | |
| 1819 | day-name = "Mon" / "Tue" / "Wed" / "Thu" / |
| 1820 | "Fri" / "Sat" / "Sun" |
| 1821 | |
| 1822 | obs-day-of-week = [CFWS] day-name [CFWS] |
| 1823 | */ |
| 1824 | |
| 1825 | static const uschar *day_name[7]={ US"mon", US"tue", US"wed", US"thu", US"fri", US"sat", US"sun" }; |
| 1826 | int i; |
| 1827 | uschar day[4]; |
| 1828 | |
| 1829 | str=skip_comment(str); |
| 1830 | for (i=0; i<3; ++i) |
| 1831 | { |
| 1832 | if ((day[i]=tolower(*str))=='\0') return NULL; |
| 1833 | ++str; |
| 1834 | } |
| 1835 | day[3]='\0'; |
| 1836 | for (i=0; i<7; ++i) if (Ustrcmp(day,day_name[i])==0) break; |
| 1837 | if (i==7) return NULL; |
| 1838 | str=skip_comment(str); |
| 1839 | return str; |
| 1840 | } |
| 1841 | |
| 1842 | |
| 1843 | /************************************************* |
| 1844 | * Parse a RFC 2822 date * |
| 1845 | *************************************************/ |
| 1846 | |
| 1847 | /* Parse the date part of a RFC 2822 date-time, extracting the |
| 1848 | day, month and year. |
| 1849 | |
| 1850 | Arguments: |
| 1851 | str pointer to the start of the date |
| 1852 | d pointer to the resulting day |
| 1853 | m pointer to the resulting month |
| 1854 | y pointer to the resulting year |
| 1855 | |
| 1856 | Returns: points after the processed date or NULL on error |
| 1857 | */ |
| 1858 | |
| 1859 | static uschar * |
| 1860 | parse_date(uschar *str, int *d, int *m, int *y) |
| 1861 | { |
| 1862 | /* |
| 1863 | date = day month year |
| 1864 | |
| 1865 | year = 4*DIGIT / obs-year |
| 1866 | |
| 1867 | obs-year = [CFWS] 2*DIGIT [CFWS] |
| 1868 | |
| 1869 | month = (FWS month-name FWS) / obs-month |
| 1870 | |
| 1871 | month-name = "Jan" / "Feb" / "Mar" / "Apr" / |
| 1872 | "May" / "Jun" / "Jul" / "Aug" / |
| 1873 | "Sep" / "Oct" / "Nov" / "Dec" |
| 1874 | |
| 1875 | obs-month = CFWS month-name CFWS |
| 1876 | |
| 1877 | day = ([FWS] 1*2DIGIT) / obs-day |
| 1878 | |
| 1879 | obs-day = [CFWS] 1*2DIGIT [CFWS] |
| 1880 | */ |
| 1881 | |
| 1882 | uschar *c,*n; |
| 1883 | static const uschar *month_name[]={ US"jan", US"feb", US"mar", US"apr", US"may", US"jun", US"jul", US"aug", US"sep", US"oct", US"nov", US"dec" }; |
| 1884 | int i; |
| 1885 | uschar month[4]; |
| 1886 | |
| 1887 | str=skip_comment(str); |
| 1888 | if ((str=parse_number(str,d,1))==NULL) return NULL; |
| 1889 | if (*str>='0' && *str<='9') *d=10*(*d)+(*str++-'0'); |
| 1890 | c=skip_comment(str); |
| 1891 | if (c==str) return NULL; |
| 1892 | else str=c; |
| 1893 | for (i=0; i<3; ++i) if ((month[i]=tolower(*(str+i)))=='\0') return NULL; |
| 1894 | month[3]='\0'; |
| 1895 | for (i=0; i<12; ++i) if (Ustrcmp(month,month_name[i])==0) break; |
| 1896 | if (i==12) return NULL; |
| 1897 | str+=3; |
| 1898 | *m=i; |
| 1899 | c=skip_comment(str); |
| 1900 | if (c==str) return NULL; |
| 1901 | else str=c; |
| 1902 | if ((n=parse_number(str,y,4))) |
| 1903 | { |
| 1904 | str=n; |
| 1905 | if (*y<1900) return NULL; |
| 1906 | *y=*y-1900; |
| 1907 | } |
| 1908 | else if ((n=parse_number(str,y,2))) |
| 1909 | { |
| 1910 | str=skip_comment(n); |
| 1911 | while (*(str-1)==' ' || *(str-1)=='\t') --str; /* match last FWS later */ |
| 1912 | if (*y<50) *y+=100; |
| 1913 | } |
| 1914 | else return NULL; |
| 1915 | return str; |
| 1916 | } |
| 1917 | |
| 1918 | |
| 1919 | /************************************************* |
| 1920 | * Parse a RFC 2822 Time * |
| 1921 | *************************************************/ |
| 1922 | |
| 1923 | /* Parse the time part of a RFC 2822 date-time, extracting the |
| 1924 | hour, minute, second and timezone. |
| 1925 | |
| 1926 | Arguments: |
| 1927 | str pointer to the start of the time |
| 1928 | h pointer to the resulting hour |
| 1929 | m pointer to the resulting minute |
| 1930 | s pointer to the resulting second |
| 1931 | z pointer to the resulting timezone (offset in seconds) |
| 1932 | |
| 1933 | Returns: points after the processed time or NULL on error |
| 1934 | */ |
| 1935 | |
| 1936 | static uschar * |
| 1937 | parse_time(uschar *str, int *h, int *m, int *s, int *z) |
| 1938 | { |
| 1939 | /* |
| 1940 | time = time-of-day FWS zone |
| 1941 | |
| 1942 | time-of-day = hour ":" minute [ ":" second ] |
| 1943 | |
| 1944 | hour = 2DIGIT / obs-hour |
| 1945 | |
| 1946 | obs-hour = [CFWS] 2DIGIT [CFWS] |
| 1947 | |
| 1948 | minute = 2DIGIT / obs-minute |
| 1949 | |
| 1950 | obs-minute = [CFWS] 2DIGIT [CFWS] |
| 1951 | |
| 1952 | second = 2DIGIT / obs-second |
| 1953 | |
| 1954 | obs-second = [CFWS] 2DIGIT [CFWS] |
| 1955 | |
| 1956 | zone = (( "+" / "-" ) 4DIGIT) / obs-zone |
| 1957 | |
| 1958 | obs-zone = "UT" / "GMT" / ; Universal Time |
| 1959 | ; North American UT |
| 1960 | ; offsets |
| 1961 | "EST" / "EDT" / ; Eastern: - 5/ - 4 |
| 1962 | "CST" / "CDT" / ; Central: - 6/ - 5 |
| 1963 | "MST" / "MDT" / ; Mountain: - 7/ - 6 |
| 1964 | "PST" / "PDT" / ; Pacific: - 8/ - 7 |
| 1965 | |
| 1966 | %d65-73 / ; Military zones - "A" |
| 1967 | %d75-90 / ; through "I" and "K" |
| 1968 | %d97-105 / ; through "Z", both |
| 1969 | %d107-122 ; upper and lower case |
| 1970 | */ |
| 1971 | |
| 1972 | uschar *c; |
| 1973 | |
| 1974 | str=skip_comment(str); |
| 1975 | if ((str=parse_number(str,h,2))==NULL) return NULL; |
| 1976 | str=skip_comment(str); |
| 1977 | if (*str!=':') return NULL; |
| 1978 | ++str; |
| 1979 | str=skip_comment(str); |
| 1980 | if ((str=parse_number(str,m,2))==NULL) return NULL; |
| 1981 | c=skip_comment(str); |
| 1982 | if (*str==':') |
| 1983 | { |
| 1984 | ++str; |
| 1985 | str=skip_comment(str); |
| 1986 | if ((str=parse_number(str,s,2))==NULL) return NULL; |
| 1987 | c=skip_comment(str); |
| 1988 | } |
| 1989 | if (c==str) return NULL; |
| 1990 | else str=c; |
| 1991 | if (*str=='+' || *str=='-') |
| 1992 | { |
| 1993 | int neg; |
| 1994 | |
| 1995 | neg=(*str=='-'); |
| 1996 | ++str; |
| 1997 | if ((str=parse_number(str,z,4))==NULL) return NULL; |
| 1998 | *z=(*z/100)*3600+(*z%100)*60; |
| 1999 | if (neg) *z=-*z; |
| 2000 | } |
| 2001 | else |
| 2002 | { |
| 2003 | char zone[5]; |
| 2004 | struct { const char *name; int off; } zone_name[10]= |
| 2005 | { {"gmt",0}, {"ut",0}, {"est",-5}, {"edt",-4}, {"cst",-6}, {"cdt",-5}, {"mst",-7}, {"mdt",-6}, {"pst",-8}, {"pdt",-7}}; |
| 2006 | int i,j; |
| 2007 | |
| 2008 | for (i=0; i<4; ++i) |
| 2009 | { |
| 2010 | zone[i]=tolower(*(str+i)); |
| 2011 | if (zone[i]<'a' || zone[i]>'z') break; |
| 2012 | } |
| 2013 | zone[i]='\0'; |
| 2014 | for (j=0; j<10 && strcmp(zone,zone_name[j].name); ++j); |
| 2015 | /* Besides zones named in the grammar, RFC 2822 says other alphabetic */ |
| 2016 | /* time zones should be treated as unknown offsets. */ |
| 2017 | if (j<10) |
| 2018 | { |
| 2019 | *z=zone_name[j].off*3600; |
| 2020 | str+=i; |
| 2021 | } |
| 2022 | else if (zone[0]<'a' || zone[1]>'z') return 0; |
| 2023 | else |
| 2024 | { |
| 2025 | while ((*str>='a' && *str<='z') || (*str>='A' && *str<='Z')) ++str; |
| 2026 | *z=0; |
| 2027 | } |
| 2028 | } |
| 2029 | return str; |
| 2030 | } |
| 2031 | |
| 2032 | |
| 2033 | /************************************************* |
| 2034 | * Parse a RFC 2822 date-time * |
| 2035 | *************************************************/ |
| 2036 | |
| 2037 | /* Parse a RFC 2822 date-time and return it in seconds since the epoch. |
| 2038 | |
| 2039 | Arguments: |
| 2040 | str pointer to the start of the date-time |
| 2041 | t pointer to the parsed time |
| 2042 | |
| 2043 | Returns: points after the processed date-time or NULL on error |
| 2044 | */ |
| 2045 | |
| 2046 | uschar * |
| 2047 | parse_date_time(uschar *str, time_t *t) |
| 2048 | { |
| 2049 | /* |
| 2050 | date-time = [ day-of-week "," ] date FWS time [CFWS] |
| 2051 | */ |
| 2052 | |
| 2053 | struct tm tm; |
| 2054 | int zone; |
| 2055 | extern char **environ; |
| 2056 | char **old_environ; |
| 2057 | static char gmt0[]="TZ=GMT0"; |
| 2058 | static char *gmt_env[]={ gmt0, (char*)0 }; |
| 2059 | uschar *try; |
| 2060 | |
| 2061 | if ((try=parse_day_of_week(str))) |
| 2062 | { |
| 2063 | str=try; |
| 2064 | if (*str!=',') return 0; |
| 2065 | ++str; |
| 2066 | } |
| 2067 | if ((str=parse_date(str,&tm.tm_mday,&tm.tm_mon,&tm.tm_year))==NULL) return NULL; |
| 2068 | if (*str!=' ' && *str!='\t') return NULL; |
| 2069 | while (*str==' ' || *str=='\t') ++str; |
| 2070 | if ((str=parse_time(str,&tm.tm_hour,&tm.tm_min,&tm.tm_sec,&zone))==NULL) return NULL; |
| 2071 | tm.tm_isdst=0; |
| 2072 | old_environ=environ; |
| 2073 | environ=gmt_env; |
| 2074 | *t=mktime(&tm); |
| 2075 | environ=old_environ; |
| 2076 | if (*t==-1) return NULL; |
| 2077 | *t-=zone; |
| 2078 | str=skip_comment(str); |
| 2079 | return str; |
| 2080 | } |
| 2081 | |
| 2082 | |
| 2083 | |
| 2084 | |
| 2085 | /************************************************* |
| 2086 | ************************************************** |
| 2087 | * Stand-alone test program * |
| 2088 | ************************************************** |
| 2089 | *************************************************/ |
| 2090 | |
| 2091 | #if defined STAND_ALONE |
| 2092 | int main(void) |
| 2093 | { |
| 2094 | int start, end, domain; |
| 2095 | uschar buffer[1024]; |
| 2096 | uschar outbuff[1024]; |
| 2097 | |
| 2098 | big_buffer = store_malloc(big_buffer_size); |
| 2099 | |
| 2100 | /* strip_trailing_dot = TRUE; */ |
| 2101 | allow_domain_literals = TRUE; |
| 2102 | |
| 2103 | printf("Testing parse_fix_phrase\n"); |
| 2104 | |
| 2105 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2106 | { |
| 2107 | buffer[Ustrlen(buffer)-1] = 0; |
| 2108 | if (buffer[0] == 0) break; |
| 2109 | printf("%s\n", CS parse_fix_phrase(buffer, Ustrlen(buffer), outbuff, |
| 2110 | sizeof(outbuff))); |
| 2111 | } |
| 2112 | |
| 2113 | printf("Testing parse_extract_address without group syntax and without UTF-8\n"); |
| 2114 | |
| 2115 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2116 | { |
| 2117 | uschar *out; |
| 2118 | uschar *errmess; |
| 2119 | buffer[Ustrlen(buffer) - 1] = 0; |
| 2120 | if (buffer[0] == 0) break; |
| 2121 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); |
| 2122 | if (out == NULL) printf("*** bad address: %s\n", errmess); else |
| 2123 | { |
| 2124 | uschar extract[1024]; |
| 2125 | Ustrncpy(extract, buffer+start, end-start); |
| 2126 | extract[end-start] = 0; |
| 2127 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); |
| 2128 | } |
| 2129 | } |
| 2130 | |
| 2131 | printf("Testing parse_extract_address without group syntax but with UTF-8\n"); |
| 2132 | |
| 2133 | allow_utf8_domains = TRUE; |
| 2134 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2135 | { |
| 2136 | uschar *out; |
| 2137 | uschar *errmess; |
| 2138 | buffer[Ustrlen(buffer) - 1] = 0; |
| 2139 | if (buffer[0] == 0) break; |
| 2140 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); |
| 2141 | if (out == NULL) printf("*** bad address: %s\n", errmess); else |
| 2142 | { |
| 2143 | uschar extract[1024]; |
| 2144 | Ustrncpy(extract, buffer+start, end-start); |
| 2145 | extract[end-start] = 0; |
| 2146 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); |
| 2147 | } |
| 2148 | } |
| 2149 | allow_utf8_domains = FALSE; |
| 2150 | |
| 2151 | printf("Testing parse_extract_address with group syntax\n"); |
| 2152 | |
| 2153 | parse_allow_group = TRUE; |
| 2154 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2155 | { |
| 2156 | uschar *out; |
| 2157 | uschar *errmess; |
| 2158 | uschar *s; |
| 2159 | buffer[Ustrlen(buffer) - 1] = 0; |
| 2160 | if (buffer[0] == 0) break; |
| 2161 | s = buffer; |
| 2162 | while (*s != 0) |
| 2163 | { |
| 2164 | uschar *ss = parse_find_address_end(s, FALSE); |
| 2165 | int terminator = *ss; |
| 2166 | *ss = 0; |
| 2167 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); |
| 2168 | *ss = terminator; |
| 2169 | |
| 2170 | if (out == NULL) printf("*** bad address: %s\n", errmess); else |
| 2171 | { |
| 2172 | uschar extract[1024]; |
| 2173 | Ustrncpy(extract, buffer+start, end-start); |
| 2174 | extract[end-start] = 0; |
| 2175 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); |
| 2176 | } |
| 2177 | |
| 2178 | s = ss + (terminator? 1:0); |
| 2179 | while (isspace(*s)) s++; |
| 2180 | } |
| 2181 | } |
| 2182 | |
| 2183 | printf("Testing parse_find_at\n"); |
| 2184 | |
| 2185 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2186 | { |
| 2187 | uschar *s; |
| 2188 | buffer[Ustrlen(buffer)-1] = 0; |
| 2189 | if (buffer[0] == 0) break; |
| 2190 | s = parse_find_at(buffer); |
| 2191 | if (s == NULL) printf("no @ found\n"); |
| 2192 | else printf("offset = %d\n", s - buffer); |
| 2193 | } |
| 2194 | |
| 2195 | printf("Testing parse_extract_addresses\n"); |
| 2196 | |
| 2197 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2198 | { |
| 2199 | uschar *errmess; |
| 2200 | int extracted; |
| 2201 | address_item *anchor = NULL; |
| 2202 | buffer[Ustrlen(buffer) - 1] = 0; |
| 2203 | if (buffer[0] == 0) break; |
| 2204 | if ((extracted = parse_forward_list(buffer, -1, &anchor, |
| 2205 | &errmess, US"incoming.domain", NULL, NULL)) == FF_DELIVERED) |
| 2206 | { |
| 2207 | while (anchor != NULL) |
| 2208 | { |
| 2209 | address_item *addr = anchor; |
| 2210 | anchor = anchor->next; |
| 2211 | printf("%d %s\n", testflag(addr, af_pfr), addr->address); |
| 2212 | } |
| 2213 | } |
| 2214 | else printf("Failed: %d %s\n", extracted, errmess); |
| 2215 | } |
| 2216 | |
| 2217 | printf("Testing parse_message_id\n"); |
| 2218 | |
| 2219 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) |
| 2220 | { |
| 2221 | uschar *s, *t, *errmess; |
| 2222 | buffer[Ustrlen(buffer) - 1] = 0; |
| 2223 | if (buffer[0] == 0) break; |
| 2224 | s = buffer; |
| 2225 | while (*s != 0) |
| 2226 | { |
| 2227 | s = parse_message_id(s, &t, &errmess); |
| 2228 | if (errmess != NULL) |
| 2229 | { |
| 2230 | printf("Failed: %s\n", errmess); |
| 2231 | break; |
| 2232 | } |
| 2233 | printf("%s\n", t); |
| 2234 | } |
| 2235 | } |
| 2236 | |
| 2237 | return 0; |
| 2238 | } |
| 2239 | |
| 2240 | #endif |
| 2241 | |
| 2242 | /* End of parse.c */ |