Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
0a49a7a4 | 5 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
059ec3d9 PH |
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 | Regurns: 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 | |
309bd837 PH |
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. | |
059ec3d9 | 246 | |
309bd837 PH |
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. */ | |
059ec3d9 PH |
250 | |
251 | if (*s == '[') | |
252 | { | |
253 | *t++ = *s++; | |
254 | ||
059ec3d9 PH |
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 | ||
059ec3d9 PH |
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 | { | |
554 | if (*s != term) | |
555 | { | |
556 | if (*s != '@') | |
557 | *errorptr = string_sprintf("\"@\" or \".\" expected after \"%s\"", t); | |
558 | else | |
559 | { | |
560 | t += Ustrlen((const uschar *)t); | |
561 | *t++ = *s++; | |
562 | *domainptr = t; | |
563 | s = read_domain(s, t, errorptr); | |
564 | } | |
565 | } | |
566 | } | |
567 | return s; | |
568 | } | |
569 | ||
570 | ||
571 | ||
572 | /************************************************* | |
573 | * Extract operative address * | |
574 | *************************************************/ | |
575 | ||
576 | /* This function extracts an operative address from a full RFC822 mailbox and | |
577 | returns it in a piece of dynamic store. We take the easy way and get a piece | |
578 | of store the same size as the input, and then copy into it whatever is | |
579 | necessary. If we cannot find a valid address (syntax error), return NULL, and | |
580 | point the error pointer to the reason. The arguments "start" and "end" are used | |
581 | to return the offsets of the first and one past the last characters in the | |
582 | original mailbox of the address that has been extracted, to aid in re-writing. | |
583 | The argument "domain" is set to point to the first character after "@" in the | |
584 | final part of the returned address, or zero if there is no @. | |
585 | ||
586 | Exim no longer supports the use of source routed addresses (those of the form | |
587 | @domain,...:route_addr). It recognizes the syntax, but collapses such addresses | |
588 | down to their final components. Formerly, collapse_source_routes had to be set | |
589 | to achieve this effect. RFC 1123 allows collapsing with MAY, while the revision | |
590 | of RFC 821 had increased this to SHOULD, so I've gone for it, because it makes | |
591 | a lot of code elsewhere in Exim much simpler. | |
592 | ||
593 | There are some special fudges here for handling RFC 822 group address notation | |
594 | which may appear in certain headers. If the flag parse_allow_group is set | |
595 | TRUE and parse_found_group is FALSE when this function is called, an address | |
596 | which is the start of a group (i.e. preceded by a phrase and a colon) is | |
597 | recognized; the phrase is ignored and the flag parse_found_group is set. If | |
1eccaa59 PH |
598 | this flag is TRUE at the end of an address, and if an extraneous semicolon is |
599 | found, it is ignored and the flag is cleared. | |
600 | ||
601 | This logic is used only when scanning through addresses in headers, either to | |
602 | fulfil the -t option, or for rewriting, or for checking header syntax. Because | |
603 | the group "state" has to be remembered between multiple calls of this function, | |
604 | the variables parse_{allow,found}_group are global. It is important to ensure | |
605 | that they are reset to FALSE at the end of scanning a header's list of | |
606 | addresses. | |
059ec3d9 PH |
607 | |
608 | Arguments: | |
609 | mailbox points to the RFC822 mailbox | |
610 | errorptr where to point an error message | |
611 | start set to start offset in mailbox | |
612 | end set to end offset in mailbox | |
613 | domain set to domain offset in result, or 0 if no domain present | |
614 | allow_null allow <> if TRUE | |
615 | ||
616 | Returns: points to the extracted address, or NULL on error | |
617 | */ | |
618 | ||
619 | #define FAILED(s) { *errorptr = s; goto PARSE_FAILED; } | |
620 | ||
621 | uschar * | |
622 | parse_extract_address(uschar *mailbox, uschar **errorptr, int *start, int *end, | |
623 | int *domain, BOOL allow_null) | |
624 | { | |
625 | uschar *yield = store_get(Ustrlen(mailbox) + 1); | |
626 | uschar *startptr, *endptr; | |
627 | uschar *s = (uschar *)mailbox; | |
628 | uschar *t = (uschar *)yield; | |
629 | ||
630 | *domain = 0; | |
631 | ||
632 | /* At the start of the string we expect either an addr-spec or a phrase | |
633 | preceding a <route-addr>. If groups are allowed, we might also find a phrase | |
634 | preceding a colon and an address. If we find an initial word followed by | |
635 | a dot, strict interpretation of the RFC would cause it to be taken | |
636 | as the start of an addr-spec. However, many mailers break the rules | |
637 | and use addresses of the form "a.n.other <ano@somewhere>" and so we | |
638 | allow this case. */ | |
639 | ||
640 | RESTART: /* Come back here after passing a group name */ | |
641 | ||
642 | s = skip_comment(s); | |
643 | startptr = s; /* In case addr-spec */ | |
644 | s = read_local_part(s, t, errorptr, TRUE); /* Dot separated words */ | |
645 | if (*errorptr != NULL) goto PARSE_FAILED; | |
646 | ||
647 | /* If the terminator is neither < nor @ then the format of the address | |
648 | must either be a bare local-part (we are now at the end), or a phrase | |
649 | followed by a route-addr (more words must follow). */ | |
650 | ||
651 | if (*s != '@' && *s != '<') | |
652 | { | |
653 | if (*s == 0 || *s == ';') | |
654 | { | |
655 | if (*t == 0) FAILED(US"empty address"); | |
656 | endptr = last_comment_position; | |
657 | goto PARSE_SUCCEEDED; /* Bare local part */ | |
658 | } | |
659 | ||
660 | /* Expect phrase route-addr, or phrase : if groups permitted, but allow | |
661 | dots in the phrase; complete the loop only when '<' or ':' is encountered - | |
662 | end of string will produce a null local_part and therefore fail. We don't | |
663 | need to keep updating t, as the phrase isn't to be kept. */ | |
664 | ||
665 | while (*s != '<' && (!parse_allow_group || *s != ':')) | |
666 | { | |
667 | s = read_local_part(s, t, errorptr, FALSE); | |
668 | if (*errorptr != NULL) | |
669 | { | |
670 | *errorptr = string_sprintf("%s (expected word or \"<\")", *errorptr); | |
671 | goto PARSE_FAILED; | |
672 | } | |
673 | } | |
674 | ||
675 | if (*s == ':') | |
676 | { | |
677 | parse_found_group = TRUE; | |
678 | parse_allow_group = FALSE; | |
679 | s++; | |
680 | goto RESTART; | |
681 | } | |
682 | ||
683 | /* Assert *s == '<' */ | |
684 | } | |
685 | ||
686 | /* At this point the next character is either '@' or '<'. If it is '@', only a | |
687 | single local-part has previously been read. An angle bracket signifies the | |
688 | start of an <addr-spec>. Throw away anything we have saved so far before | |
689 | processing it. Note that this is "if" rather than "else if" because it's also | |
690 | used after reading a preceding phrase. | |
691 | ||
692 | There are a lot of broken sendmails out there that put additional pairs of <> | |
693 | round <route-addr>s. If strip_excess_angle_brackets is set, allow any number of | |
694 | them, as long as they match. */ | |
695 | ||
696 | if (*s == '<') | |
697 | { | |
698 | uschar *domainptr = yield; | |
699 | BOOL source_routed = FALSE; | |
700 | int bracket_count = 1; | |
701 | ||
702 | s++; | |
703 | if (strip_excess_angle_brackets) | |
704 | while (*s == '<') { bracket_count++; s++; } | |
705 | ||
706 | t = yield; | |
707 | startptr = s; | |
708 | s = skip_comment(s); | |
709 | ||
710 | /* Read an optional series of routes, each of which is a domain. They | |
711 | are separated by commas and terminated by a colon. However, we totally ignore | |
712 | such routes (RFC 1123 says we MAY, and the revision of RFC 821 says we | |
713 | SHOULD). */ | |
714 | ||
715 | if (*s == '@') | |
716 | { | |
717 | s = read_route(s, t, errorptr); | |
718 | if (*errorptr != NULL) goto PARSE_FAILED; | |
719 | *t = 0; /* Ensure route is ignored - probably overkill */ | |
720 | source_routed = TRUE; | |
721 | } | |
722 | ||
723 | /* Now an addr-spec, terminated by '>'. If there is no preceding route, | |
724 | we must allow an empty addr-spec if allow_null is TRUE, to permit the | |
725 | address "<>" in some circumstances. A source-routed address MUST have | |
726 | a domain in the final part. */ | |
727 | ||
728 | if (allow_null && !source_routed && *s == '>') | |
729 | { | |
730 | *t = 0; | |
731 | *errorptr = NULL; | |
732 | } | |
733 | else | |
734 | { | |
735 | s = read_addr_spec(s, t, '>', errorptr, &domainptr); | |
736 | if (*errorptr != NULL) goto PARSE_FAILED; | |
737 | *domain = domainptr - yield; | |
738 | if (source_routed && *domain == 0) | |
739 | FAILED(US"domain missing in source-routed address"); | |
740 | } | |
741 | ||
742 | endptr = s; | |
743 | if (*errorptr != NULL) goto PARSE_FAILED; | |
744 | while (bracket_count-- > 0) if (*s++ != '>') | |
745 | { | |
746 | *errorptr = (s[-1] == 0)? 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 (uschar *)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 | ||
8e669ac1 PH |
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 | |
14702f5b PH |
851 | to check for overlong "encoded-word"s and split them. November 2004. |
852 | ||
059ec3d9 PH |
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 | |
46218253 PH |
860 | fold if TRUE, a newline is inserted before the separating space when |
861 | more than one encoded-word is generated | |
059ec3d9 PH |
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 | uschar * | |
870 | parse_quote_2047(uschar *string, int len, uschar *charset, uschar *buffer, | |
46218253 | 871 | int buffer_size, BOOL fold) |
059ec3d9 PH |
872 | { |
873 | uschar *s = string; | |
14702f5b PH |
874 | uschar *p, *t; |
875 | int hlen; | |
059ec3d9 | 876 | BOOL coded = FALSE; |
86ae49a6 | 877 | BOOL first_byte = FALSE; |
059ec3d9 PH |
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 | ||
14702f5b PH |
886 | hlen = Ustrlen(buffer); |
887 | t = buffer + hlen; | |
888 | p = buffer; | |
889 | ||
059ec3d9 PH |
890 | for (; len > 0; len--) |
891 | { | |
892 | int ch = *s++; | |
14702f5b | 893 | if (t > buffer + buffer_size - hlen - 8) break; |
8e669ac1 | 894 | |
86ae49a6 | 895 | if ((t - p > 67) && !first_byte) |
14702f5b PH |
896 | { |
897 | *t++ = '?'; | |
898 | *t++ = '='; | |
46218253 | 899 | if (fold) *t++ = '\n'; |
14702f5b PH |
900 | *t++ = ' '; |
901 | p = t; | |
902 | Ustrncpy(p, buffer, hlen); | |
903 | t += hlen; | |
8e669ac1 PH |
904 | } |
905 | ||
059ec3d9 PH |
906 | if (ch < 33 || ch > 126 || |
907 | Ustrchr("?=()<>@,;:\\\".[]_", ch) != NULL) | |
908 | { | |
86ae49a6 NM |
909 | if (ch == ' ') |
910 | { | |
911 | *t++ = '_'; | |
912 | first_byte = FALSE; | |
913 | } | |
914 | else | |
059ec3d9 PH |
915 | { |
916 | sprintf(CS t, "=%02X", ch); | |
917 | while (*t != 0) t++; | |
918 | coded = TRUE; | |
86ae49a6 | 919 | first_byte = !first_byte; |
059ec3d9 PH |
920 | } |
921 | } | |
86ae49a6 | 922 | else { *t++ = ch; first_byte = FALSE; } |
059ec3d9 | 923 | } |
8e669ac1 | 924 | |
14702f5b | 925 | *t++ = '?'; |
8e669ac1 | 926 | *t++ = '='; |
14702f5b | 927 | *t = 0; |
8e669ac1 | 928 | |
059ec3d9 PH |
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 | uschar * | |
989 | parse_fix_phrase(uschar *phrase, int len, uschar *buffer, int buffer_size) | |
990 | { | |
991 | int ch, i; | |
992 | BOOL quoted = FALSE; | |
993 | uschar *s, *t, *end, *yield; | |
994 | ||
995 | while (len > 0 && isspace(*phrase)) { phrase++; len--; } | |
996 | if (len > buffer_size/4) return US"Name too long"; | |
997 | ||
998 | /* See if there are any non-printing characters, and if so, use the RFC 2047 | |
999 | encoding for the whole thing. */ | |
1000 | ||
1001 | for (i = 0, s = phrase; i < len; i++, s++) | |
1002 | if ((*s < 32 && *s != '\t') || *s > 126) break; | |
1003 | ||
1004 | if (i < len) return parse_quote_2047(phrase, len, headers_charset, buffer, | |
46218253 | 1005 | buffer_size, FALSE); |
059ec3d9 PH |
1006 | |
1007 | /* No non-printers; use the RFC 822 quoting rules */ | |
1008 | ||
1009 | s = phrase; | |
1010 | end = s + len; | |
1011 | yield = t = buffer + 1; | |
1012 | ||
1013 | while (s < end) | |
1014 | { | |
1015 | ch = *s++; | |
1016 | ||
1017 | /* Copy over quoted strings, remembering we encountered one */ | |
1018 | ||
1019 | if (ch == '\"') | |
1020 | { | |
1021 | *t++ = '\"'; | |
1022 | while (s < end && (ch = *s++) != '\"') | |
1023 | { | |
1024 | *t++ = ch; | |
1025 | if (ch == '\\' && s < end) *t++ = *s++; | |
1026 | } | |
1027 | *t++ = '\"'; | |
1028 | if (s >= end) break; | |
1029 | quoted = TRUE; | |
1030 | } | |
1031 | ||
1032 | /* Copy over comments, noting if they contain freestanding quote | |
1033 | characters */ | |
1034 | ||
1035 | else if (ch == '(') | |
1036 | { | |
1037 | int level = 1; | |
1038 | *t++ = '('; | |
1039 | while (s < end) | |
1040 | { | |
1041 | ch = *s++; | |
1042 | *t++ = ch; | |
1043 | if (ch == '(') level++; | |
1044 | else if (ch == ')') { if (--level <= 0) break; } | |
1045 | else if (ch == '\\' && s < end) *t++ = *s++ & 127; | |
1046 | else if (ch == '\"') quoted = TRUE; | |
1047 | } | |
1048 | if (ch == 0) | |
1049 | { | |
1050 | while (level--) *t++ = ')'; | |
1051 | break; | |
1052 | } | |
1053 | } | |
1054 | ||
1055 | /* Handle special characters that need to be quoted */ | |
1056 | ||
1057 | else if (Ustrchr(")<>@,;:\\.[]", ch) != NULL) | |
1058 | { | |
1059 | /* If hit previous quotes just make one quoted "word" */ | |
1060 | ||
1061 | if (quoted) | |
1062 | { | |
1063 | uschar *tt = t++; | |
1064 | while (*(--tt) != ' ' && *tt != '\"' && *tt != ')') tt[1] = *tt; | |
1065 | tt[1] = '\"'; | |
1066 | *t++ = ch; | |
1067 | while (s < end) | |
1068 | { | |
1069 | ch = *s++; | |
1070 | if (ch == ' ' || ch == '\"') { s--; break; } else *t++ = ch; | |
1071 | } | |
1072 | *t++ = '\"'; | |
1073 | } | |
1074 | ||
1075 | /* Else quote the whole string so far, and the rest up to any following | |
1076 | quotes. We must treat anything following a backslash as a literal. */ | |
1077 | ||
1078 | else | |
1079 | { | |
1080 | BOOL escaped = (ch == '\\'); | |
1081 | *(--yield) = '\"'; | |
1082 | *t++ = ch; | |
1083 | ||
1084 | /* Now look for the end or a quote */ | |
1085 | ||
1086 | while (s < end) | |
1087 | { | |
1088 | ch = *s++; | |
1089 | ||
1090 | /* Handle escaped pairs */ | |
1091 | ||
1092 | if (escaped) | |
1093 | { | |
1094 | *t++ = ch; | |
1095 | escaped = FALSE; | |
1096 | } | |
1097 | ||
1098 | else if (ch == '\\') | |
1099 | { | |
1100 | *t++ = ch; | |
1101 | escaped = TRUE; | |
1102 | } | |
1103 | ||
1104 | /* If hit subsequent quotes, insert our quote before any trailing | |
1105 | spaces and back up to re-handle the quote in the outer loop. */ | |
1106 | ||
1107 | else if (ch == '\"') | |
1108 | { | |
1109 | int count = 0; | |
1110 | while (t[-1] == ' ') { t--; count++; } | |
1111 | *t++ = '\"'; | |
1112 | while (count-- > 0) *t++ = ' '; | |
1113 | s--; | |
1114 | break; | |
1115 | } | |
1116 | ||
1117 | /* If hit a subsequent comment, check it for unescaped quotes, | |
1118 | and if so, end our quote before it. */ | |
1119 | ||
1120 | else if (ch == '(') | |
1121 | { | |
1122 | uschar *ss = s; /* uschar after '(' */ | |
1123 | int level = 1; | |
1124 | while(ss < end) | |
1125 | { | |
1126 | ch = *ss++; | |
1127 | if (ch == '(') level++; | |
1128 | else if (ch == ')') { if (--level <= 0) break; } | |
1129 | else if (ch == '\\' && ss+1 < end) ss++; | |
1130 | else if (ch == '\"') { quoted = TRUE; break; } | |
1131 | } | |
1132 | ||
1133 | /* Comment contains unescaped quotes; end our quote before | |
1134 | the start of the comment. */ | |
1135 | ||
1136 | if (quoted) | |
1137 | { | |
1138 | int count = 0; | |
1139 | while (t[-1] == ' ') { t--; count++; } | |
1140 | *t++ = '\"'; | |
1141 | while (count-- > 0) *t++ = ' '; | |
1142 | break; | |
1143 | } | |
1144 | ||
1145 | /* Comment does not contain unescaped quotes; include it in | |
1146 | our quote. */ | |
1147 | ||
1148 | else | |
1149 | { | |
1150 | if (ss >= end) ss--; | |
1151 | *t++ = '('; | |
1152 | Ustrncpy(t, s, ss-s); | |
1153 | t += ss-s; | |
1154 | s = ss; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | /* Not a comment or quote; include this character in our quotes. */ | |
1159 | ||
1160 | else *t++ = ch; | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | /* Add a final quote if we hit the end of the string. */ | |
1165 | ||
1166 | if (s >= end) *t++ = '\"'; | |
1167 | } | |
1168 | ||
1169 | /* Non-special character; just copy it over */ | |
1170 | ||
1171 | else *t++ = ch; | |
1172 | } | |
1173 | ||
1174 | *t = 0; | |
1175 | return yield; | |
1176 | } | |
1177 | ||
1178 | ||
1179 | /************************************************* | |
1180 | * Extract addresses from a list * | |
1181 | *************************************************/ | |
1182 | ||
1183 | /* This function is called by the redirect router to scan a string containing a | |
1184 | list of addresses separated by commas (with optional white space) or by | |
1185 | newlines, and to generate a chain of address items from them. In other words, | |
1186 | to unpick data from an alias or .forward file. | |
1187 | ||
1188 | The SunOS5 documentation for alias files is not very clear on the syntax; it | |
1189 | does not say that either a comma or a newline can be used for separation. | |
1190 | However, that is the way Smail does it, so we follow suit. | |
1191 | ||
1192 | If a # character is encountered in a white space position, then characters from | |
1193 | there to the next newline are skipped. | |
1194 | ||
1195 | If an unqualified address begins with '\', just skip that character. This gives | |
1196 | compatibility with Sendmail's use of \ to prevent looping. Exim has its own | |
1197 | loop prevention scheme which handles other cases too - see the code in | |
1198 | route_address(). | |
1199 | ||
1200 | An "address" can be a specification of a file or a pipe; the latter may often | |
1201 | need to be quoted because it may contain spaces, but we don't want to retain | |
1202 | the quotes. Quotes may appear in normal addresses too, and should be retained. | |
1203 | We can distinguish between these cases, because in addresses, quotes are used | |
1204 | only for parts of the address, not the whole thing. Therefore, we remove quotes | |
1205 | from items when they entirely enclose them, but not otherwise. | |
1206 | ||
1207 | An "address" can also be of the form :include:pathname to include a list of | |
1208 | addresses contained in the specified file. | |
1209 | ||
1210 | Any unqualified addresses are qualified with and rewritten if necessary, via | |
1211 | the rewrite_address() function. | |
1212 | ||
1213 | Arguments: | |
1214 | s the list of addresses (typically a complete | |
1215 | .forward file or a list of entries in an alias file) | |
1216 | options option bits for permitting or denying various special cases; | |
1217 | not all bits are relevant here - some are for filter | |
1218 | files; those we use here are: | |
1219 | RDO_DEFER | |
1220 | RDO_FREEZE | |
1221 | RDO_FAIL | |
1222 | RDO_BLACKHOLE | |
1223 | RDO_REWRITE | |
1224 | RDO_INCLUDE | |
1225 | anchor where to hang the chain of newly-created addresses. This | |
1226 | should be initialized to NULL. | |
1227 | error where to return an error text | |
1228 | incoming domain domain of the incoming address; used to qualify unqualified | |
1229 | local parts preceded by \ | |
1230 | directory if NULL, no checks are done on :include: files | |
1231 | otherwise, included file names must start with the given | |
1232 | directory | |
1233 | syntax_errors if not NULL, it carries on after syntax errors in addresses, | |
1234 | building up a list of errors as error blocks chained on | |
1235 | here. | |
1236 | ||
1237 | Returns: FF_DELIVERED addresses extracted | |
1238 | FF_NOTDELIVERED no addresses extracted, but no errors | |
1239 | FF_BLACKHOLE :blackhole: | |
1240 | FF_DEFER :defer: | |
1241 | FF_FAIL :fail: | |
1242 | FF_INCLUDEFAIL some problem with :include:; *error set | |
1243 | FF_ERROR other problems; *error is set | |
1244 | */ | |
1245 | ||
1246 | int | |
1247 | parse_forward_list(uschar *s, int options, address_item **anchor, | |
1248 | uschar **error, uschar *incoming_domain, uschar *directory, | |
1249 | error_block **syntax_errors) | |
1250 | { | |
1251 | int count = 0; | |
1252 | ||
1253 | DEBUG(D_route) debug_printf("parse_forward_list: %s\n", s); | |
1254 | ||
1255 | for (;;) | |
1256 | { | |
1257 | int len; | |
1258 | int special = 0; | |
1259 | int specopt = 0; | |
1260 | int specbit = 0; | |
1261 | uschar *ss, *nexts; | |
1262 | address_item *addr; | |
1263 | BOOL inquote = FALSE; | |
1264 | ||
1265 | for (;;) | |
1266 | { | |
1267 | while (isspace(*s) || *s == ',') s++; | |
1268 | if (*s == '#') { while (*s != 0 && *s != '\n') s++; } else break; | |
1269 | } | |
1270 | ||
1271 | /* When we reach the end of the list, we return FF_DELIVERED if any child | |
1272 | addresses have been generated. If nothing has been generated, there are two | |
1273 | possibilities: either the list is really empty, or there were syntax errors | |
1274 | that are being skipped. (If syntax errors are not being skipped, an FF_ERROR | |
1275 | return is generated on hitting a syntax error and we don't get here.) For a | |
1276 | truly empty list we return FF_NOTDELIVERED so that the router can decline. | |
1277 | However, if the list is empty only because syntax errors were skipped, we | |
1278 | return FF_DELIVERED. */ | |
1279 | ||
1280 | if (*s == 0) | |
1281 | { | |
1282 | return (count > 0 || (syntax_errors != NULL && *syntax_errors != NULL))? | |
1283 | FF_DELIVERED : FF_NOTDELIVERED; | |
1284 | ||
1285 | /* This previous code returns FF_ERROR if nothing is generated but a | |
1286 | syntax error has been skipped. I now think it is the wrong approach, but | |
1287 | have left this here just in case, and for the record. */ | |
1288 | ||
1289 | #ifdef NEVER | |
1290 | if (count > 0) return FF_DELIVERED; /* Something was generated */ | |
1291 | ||
1292 | if (syntax_errors == NULL || /* Not skipping syntax errors, or */ | |
1293 | *syntax_errors == NULL) /* we didn't actually skip any */ | |
1294 | return FF_NOTDELIVERED; | |
1295 | ||
1296 | *error = string_sprintf("no addresses generated: syntax error in %s: %s", | |
1297 | (*syntax_errors)->text2, (*syntax_errors)->text1); | |
1298 | return FF_ERROR; | |
1299 | #endif | |
1300 | ||
1301 | } | |
1302 | ||
1303 | /* Find the end of the next address. Quoted strings in addresses may contain | |
1304 | escaped characters; I haven't found a proper specification of .forward or | |
1305 | alias files that mentions the quoting properties, but it seems right to do | |
1306 | the escaping thing in all cases, so use the function that finds the end of an | |
1307 | address. However, don't let a quoted string extend over the end of a line. */ | |
1308 | ||
1309 | ss = parse_find_address_end(s, TRUE); | |
1310 | ||
1311 | /* Remember where we finished, for starting the next one. */ | |
1312 | ||
1313 | nexts = ss; | |
1314 | ||
1315 | /* Remove any trailing spaces; we know there's at least one non-space. */ | |
1316 | ||
1317 | while (isspace((ss[-1]))) ss--; | |
1318 | ||
1319 | /* We now have s->start and ss->end of the next address. Remove quotes | |
1320 | if they completely enclose, remembering the address started with a quote | |
1321 | for handling pipes and files. Another round of removal of leading and | |
1322 | trailing spaces is then required. */ | |
1323 | ||
1324 | if (*s == '\"' && ss[-1] == '\"') | |
1325 | { | |
1326 | s++; | |
1327 | ss--; | |
1328 | inquote = TRUE; | |
1329 | while (s < ss && isspace(*s)) s++; | |
1330 | while (ss > s && isspace((ss[-1]))) ss--; | |
1331 | } | |
1332 | ||
1333 | /* Set up the length of the address. */ | |
1334 | ||
1335 | len = ss - s; | |
1336 | ||
1337 | DEBUG(D_route) | |
1338 | { | |
1339 | int save = s[len]; | |
1340 | s[len] = 0; | |
1341 | debug_printf("extract item: %s\n", s); | |
1342 | s[len] = save; | |
1343 | } | |
1344 | ||
1345 | /* Handle special addresses if permitted. If the address is :unknown: | |
1346 | ignore it - this is for backward compatibility with old alias files. You | |
1347 | don't need to use it nowadays - just generate an empty string. For :defer:, | |
1348 | :blackhole:, or :fail: we have to set up the error message and give up right | |
1349 | away. */ | |
1350 | ||
1351 | if (Ustrncmp(s, ":unknown:", len) == 0) | |
1352 | { | |
1353 | s = nexts; | |
1354 | continue; | |
1355 | } | |
1356 | ||
1357 | if (Ustrncmp(s, ":defer:", 7) == 0) | |
1358 | { special = FF_DEFER; specopt = RDO_DEFER; } /* specbit is 0 */ | |
1359 | else if (Ustrncmp(s, ":blackhole:", 11) == 0) | |
1360 | { special = FF_BLACKHOLE; specopt = specbit = RDO_BLACKHOLE; } | |
1361 | else if (Ustrncmp(s, ":fail:", 6) == 0) | |
1362 | { special = FF_FAIL; specopt = RDO_FAIL; } /* specbit is 0 */ | |
1363 | ||
1364 | if (special != 0) | |
1365 | { | |
1366 | uschar *ss = Ustrchr(s+1, ':') + 1; | |
1367 | if ((options & specopt) == specbit) | |
1368 | { | |
1369 | *error = string_sprintf("\"%.*s\" is not permitted", len, s); | |
1370 | return FF_ERROR; | |
1371 | } | |
1372 | while (*ss != 0 && isspace(*ss)) ss++; | |
1373 | while (s[len] != 0 && s[len] != '\n') len++; | |
1374 | s[len] = 0; | |
1375 | *error = string_copy(ss); | |
1376 | return special; | |
1377 | } | |
1378 | ||
1379 | /* If the address is of the form :include:pathname, read the file, and call | |
1380 | this function recursively to extract the addresses from it. If directory is | |
1381 | NULL, do no checks. Otherwise, insist that the file name starts with the | |
1382 | given directory and is a regular file. */ | |
1383 | ||
1384 | if (Ustrncmp(s, ":include:", 9) == 0) | |
1385 | { | |
1386 | uschar *filebuf; | |
1387 | uschar filename[256]; | |
1388 | uschar *t = s+9; | |
1389 | int flen = len - 9; | |
1390 | int frc; | |
1391 | struct stat statbuf; | |
1392 | address_item *last; | |
1393 | FILE *f; | |
1394 | ||
1395 | while (flen > 0 && isspace(*t)) { t++; flen--; } | |
1396 | ||
1397 | if (flen <= 0) | |
1398 | { | |
1399 | *error = string_sprintf("file name missing after :include:"); | |
1400 | return FF_ERROR; | |
1401 | } | |
1402 | ||
1403 | if (flen > 255) | |
1404 | { | |
1405 | *error = string_sprintf("included file name \"%s\" is too long", t); | |
1406 | return FF_ERROR; | |
1407 | } | |
1408 | ||
1409 | Ustrncpy(filename, t, flen); | |
1410 | filename[flen] = 0; | |
1411 | ||
1412 | /* Insist on absolute path */ | |
1413 | ||
1414 | if (filename[0]!= '/') | |
1415 | { | |
1416 | *error = string_sprintf("included file \"%s\" is not an absolute path", | |
1417 | filename); | |
1418 | return FF_ERROR; | |
1419 | } | |
1420 | ||
1421 | /* Check if include is permitted */ | |
1422 | ||
1423 | if ((options & RDO_INCLUDE) != 0) | |
1424 | { | |
1425 | *error = US"included files not permitted"; | |
1426 | return FF_ERROR; | |
1427 | } | |
1428 | ||
1429 | /* Check file name if required */ | |
1430 | ||
1431 | if (directory != NULL) | |
1432 | { | |
1433 | int len = Ustrlen(directory); | |
1434 | uschar *p = filename + len; | |
1435 | ||
1436 | if (Ustrncmp(filename, directory, len) != 0 || *p != '/') | |
1437 | { | |
1438 | *error = string_sprintf("included file %s is not in directory %s", | |
1439 | filename, directory); | |
1440 | return FF_ERROR; | |
1441 | } | |
1442 | ||
1443 | /* It is necessary to check that every component inside the directory | |
1444 | is NOT a symbolic link, in order to keep the file inside the directory. | |
1445 | This is mighty tedious. It is also not totally foolproof in that it | |
1446 | leaves the possibility of a race attack, but I don't know how to do | |
1447 | any better. */ | |
1448 | ||
1449 | while (*p != 0) | |
1450 | { | |
1451 | int temp; | |
1452 | while (*(++p) != 0 && *p != '/'); | |
1453 | temp = *p; | |
1454 | *p = 0; | |
1455 | if (Ulstat(filename, &statbuf) != 0) | |
1456 | { | |
1457 | *error = string_sprintf("failed to stat %s (component of included " | |
1458 | "file)", filename); | |
1459 | *p = temp; | |
1460 | return FF_ERROR; | |
1461 | } | |
1462 | ||
1463 | *p = temp; | |
1464 | ||
1465 | if ((statbuf.st_mode & S_IFMT) == S_IFLNK) | |
1466 | { | |
1467 | *error = string_sprintf("included file %s in the %s directory " | |
1468 | "involves a symbolic link", filename, directory); | |
1469 | return FF_ERROR; | |
1470 | } | |
1471 | } | |
1472 | } | |
1473 | ||
1474 | /* Open and stat the file */ | |
1475 | ||
1476 | if ((f = Ufopen(filename, "rb")) == NULL) | |
1477 | { | |
1478 | *error = string_open_failed(errno, "included file %s", filename); | |
1479 | return FF_INCLUDEFAIL; | |
1480 | } | |
1481 | ||
1482 | if (fstat(fileno(f), &statbuf) != 0) | |
1483 | { | |
1484 | *error = string_sprintf("failed to stat included file %s: %s", | |
1485 | filename, strerror(errno)); | |
f1e894f3 | 1486 | (void)fclose(f); |
059ec3d9 PH |
1487 | return FF_INCLUDEFAIL; |
1488 | } | |
1489 | ||
1490 | /* If directory was checked, double check that we opened a regular file */ | |
1491 | ||
1492 | if (directory != NULL && (statbuf.st_mode & S_IFMT) != S_IFREG) | |
1493 | { | |
1494 | *error = string_sprintf("included file %s is not a regular file in " | |
1495 | "the %s directory", filename, directory); | |
1496 | return FF_ERROR; | |
1497 | } | |
1498 | ||
1499 | /* Get a buffer and read the contents */ | |
1500 | ||
1501 | if (statbuf.st_size > MAX_INCLUDE_SIZE) | |
1502 | { | |
1503 | *error = string_sprintf("included file %s is too big (max %d)", | |
1504 | filename, MAX_INCLUDE_SIZE); | |
1505 | return FF_ERROR; | |
1506 | } | |
1507 | ||
1508 | filebuf = store_get(statbuf.st_size + 1); | |
1509 | if (fread(filebuf, 1, statbuf.st_size, f) != statbuf.st_size) | |
1510 | { | |
1511 | *error = string_sprintf("error while reading included file %s: %s", | |
1512 | filename, strerror(errno)); | |
f1e894f3 | 1513 | (void)fclose(f); |
059ec3d9 PH |
1514 | return FF_ERROR; |
1515 | } | |
1516 | filebuf[statbuf.st_size] = 0; | |
f1e894f3 | 1517 | (void)fclose(f); |
059ec3d9 PH |
1518 | |
1519 | addr = NULL; | |
1520 | frc = parse_forward_list(filebuf, options, &addr, | |
1521 | error, incoming_domain, directory, syntax_errors); | |
1522 | if (frc != FF_DELIVERED && frc != FF_NOTDELIVERED) return frc; | |
1523 | ||
1524 | if (addr != NULL) | |
1525 | { | |
1526 | last = addr; | |
1527 | while (last->next != NULL) { count++; last = last->next; } | |
1528 | last->next = *anchor; | |
1529 | *anchor = addr; | |
1530 | count++; | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | /* Else (not :include:) ensure address is syntactically correct and fully | |
1535 | qualified if not a pipe or a file, removing a leading \ if present on an | |
1536 | unqualified address. For pipes and files we must handle quoting. It's | |
1537 | not quite clear exactly what to do for partially quoted things, but the | |
1538 | common case of having the whole thing in quotes is straightforward. If this | |
1539 | was the case, inquote will have been set TRUE above and the quotes removed. | |
1540 | ||
1541 | There is a possible ambiguity over addresses whose local parts start with | |
1542 | a vertical bar or a slash, and the latter do in fact occur, thanks to X.400. | |
1543 | Consider a .forward file that contains the line | |
1544 | ||
1545 | /X=xxx/Y=xxx/OU=xxx/@some.gate.way | |
1546 | ||
1547 | Is this a file or an X.400 address? Does it make any difference if it is in | |
1548 | quotes? On the grounds that file names of this type are rare, Exim treats | |
1549 | something that parses as an RFC 822 address and has a domain as an address | |
1550 | rather than a file or a pipe. This is also how an address such as the above | |
1551 | would be treated if it came in from outside. */ | |
1552 | ||
1553 | else | |
1554 | { | |
1555 | int start, end, domain; | |
1556 | uschar *recipient = NULL; | |
1557 | int save = s[len]; | |
1558 | s[len] = 0; | |
1559 | ||
1560 | /* If it starts with \ and the rest of it parses as a valid mail address | |
1561 | without a domain, carry on with that address, but qualify it with the | |
1562 | incoming domain. Otherwise arrange for the address to fall through, | |
1563 | causing an error message on the re-parse. */ | |
1564 | ||
1565 | if (*s == '\\') | |
1566 | { | |
1567 | recipient = | |
1568 | parse_extract_address(s+1, error, &start, &end, &domain, FALSE); | |
1569 | if (recipient != NULL) | |
1570 | recipient = (domain != 0)? NULL : | |
1571 | string_sprintf("%s@%s", recipient, incoming_domain); | |
1572 | } | |
1573 | ||
1574 | /* Try parsing the item as an address. */ | |
1575 | ||
1576 | if (recipient == NULL) recipient = | |
1577 | parse_extract_address(s, error, &start, &end, &domain, FALSE); | |
1578 | ||
1579 | /* If item starts with / or | and is not a valid address, or there | |
1580 | is no domain, treat it as a file or pipe. If it was a quoted item, | |
1581 | remove the quoting occurrences of \ within it. */ | |
1582 | ||
1583 | if ((*s == '|' || *s == '/') && (recipient == NULL || domain == 0)) | |
1584 | { | |
1585 | uschar *t = store_get(Ustrlen(s) + 1); | |
1586 | uschar *p = t; | |
1587 | uschar *q = s; | |
1588 | while (*q != 0) | |
1589 | { | |
1590 | if (inquote) | |
1591 | { | |
1592 | *p++ = (*q == '\\')? *(++q) : *q; | |
1593 | q++; | |
1594 | } | |
1595 | else *p++ = *q++; | |
1596 | } | |
1597 | *p = 0; | |
1598 | addr = deliver_make_addr(t, TRUE); | |
1599 | setflag(addr, af_pfr); /* indicates pipe/file/reply */ | |
1600 | if (*s != '|') setflag(addr, af_file); /* indicates file */ | |
1601 | } | |
1602 | ||
1603 | /* Item must be an address. Complain if not, else qualify, rewrite and set | |
1604 | up the control block. It appears that people are in the habit of using | |
1605 | empty addresses but with comments as a way of putting comments into | |
1606 | alias and forward files. Therefore, ignore the error "empty address". | |
1607 | Mailing lists might want to tolerate syntax errors; there is therefore | |
1608 | an option to do so. */ | |
1609 | ||
1610 | else | |
1611 | { | |
1612 | if (recipient == NULL) | |
1613 | { | |
1614 | if (Ustrcmp(*error, "empty address") == 0) | |
1615 | { | |
1616 | *error = NULL; | |
1617 | s[len] = save; | |
1618 | s = nexts; | |
1619 | continue; | |
1620 | } | |
1621 | ||
1622 | if (syntax_errors != NULL) | |
1623 | { | |
1624 | error_block *e = store_get(sizeof(error_block)); | |
1625 | error_block *last = *syntax_errors; | |
1626 | if (last == NULL) *syntax_errors = e; else | |
1627 | { | |
1628 | while (last->next != NULL) last = last->next; | |
1629 | last->next = e; | |
1630 | } | |
1631 | e->next = NULL; | |
1632 | e->text1 = *error; | |
1633 | e->text2 = string_copy(s); | |
1634 | s[len] = save; | |
1635 | s = nexts; | |
1636 | continue; | |
1637 | } | |
1638 | else | |
1639 | { | |
1640 | *error = string_sprintf("%s in \"%s\"", *error, s); | |
1641 | s[len] = save; /* _after_ using it for *error */ | |
1642 | return FF_ERROR; | |
1643 | } | |
1644 | } | |
1645 | ||
1646 | /* Address was successfully parsed. Rewrite, and then make an address | |
1647 | block. */ | |
1648 | ||
1649 | recipient = ((options & RDO_REWRITE) != 0)? | |
1650 | rewrite_address(recipient, TRUE, FALSE, global_rewrite_rules, | |
1651 | rewrite_existflags) : | |
1652 | rewrite_address_qualify(recipient, TRUE); | |
1653 | addr = deliver_make_addr(recipient, TRUE); /* TRUE => copy recipient */ | |
1654 | } | |
1655 | ||
1656 | /* Restore the final character in the original data, and add to the | |
1657 | output chain. */ | |
1658 | ||
1659 | s[len] = save; | |
1660 | addr->next = *anchor; | |
1661 | *anchor = addr; | |
1662 | count++; | |
1663 | } | |
1664 | ||
1665 | /* Advance pointer for the next address */ | |
1666 | ||
1667 | s = nexts; | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | ||
30dba1e6 PH |
1672 | /************************************************* |
1673 | * Extract a Message-ID * | |
1674 | *************************************************/ | |
1675 | ||
1676 | /* This function is used to extract message ids from In-Reply-To: and | |
1677 | References: header lines. | |
1678 | ||
1679 | Arguments: | |
1680 | str pointer to the start of the message-id | |
1681 | yield put pointer to the message id (in dynamic memory) here | |
1682 | error put error message here on failure | |
1683 | ||
1684 | Returns: points after the processed message-id or NULL on error | |
1685 | */ | |
1686 | ||
1687 | uschar * | |
1688 | parse_message_id(uschar *str, uschar **yield, uschar **error) | |
1689 | { | |
1690 | uschar *domain = NULL; | |
1691 | uschar *id; | |
1692 | ||
1693 | str = skip_comment(str); | |
1694 | if (*str != '<') | |
1695 | { | |
1696 | *error = US"Missing '<' before message-id"; | |
1697 | return NULL; | |
1698 | } | |
1699 | ||
1700 | /* Getting a block the size of the input string will definitely be sufficient | |
1701 | for the answer, but it may also be very long if we are processing a header | |
1702 | line. Therefore, take care to release unwanted store afterwards. */ | |
1703 | ||
1704 | id = *yield = store_get(Ustrlen(str) + 1); | |
1705 | *id++ = *str++; | |
1706 | ||
1707 | str = read_addr_spec(str, id, '>', error, &domain); | |
1708 | ||
1709 | if (*error == NULL) | |
1710 | { | |
1711 | if (*str != '>') *error = US"Missing '>' after message-id"; | |
1712 | else if (domain == NULL) *error = US"domain missing in message-id"; | |
1713 | } | |
1714 | ||
1715 | if (*error != NULL) | |
1716 | { | |
1717 | store_reset(*yield); | |
1718 | return NULL; | |
1719 | } | |
1720 | ||
1721 | while (*id != 0) id++; | |
1722 | *id++ = *str++; | |
1723 | *id++ = 0; | |
1724 | store_reset(id); | |
1725 | ||
1726 | str = skip_comment(str); | |
1727 | return str; | |
63ac05ee MH |
1728 | } |
1729 | ||
1730 | ||
1731 | /************************************************* | |
1732 | * Parse a fixed digit number * | |
1733 | *************************************************/ | |
1734 | ||
1735 | /* Parse a string containing an ASCII encoded fixed digits number | |
1736 | ||
1737 | Arguments: | |
1738 | str pointer to the start of the ASCII encoded number | |
1739 | n pointer to the resulting value | |
1740 | digits number of required digits | |
1741 | ||
1742 | Returns: points after the processed date or NULL on error | |
1743 | */ | |
1744 | ||
1745 | static uschar * | |
1746 | parse_number(uschar *str, int *n, int digits) | |
1747 | { | |
1748 | *n=0; | |
1749 | while (digits--) | |
1750 | { | |
1751 | if (*str<'0' || *str>'9') return NULL; | |
1752 | *n=10*(*n)+(*str++-'0'); | |
1753 | } | |
1754 | return str; | |
1755 | } | |
1756 | ||
1757 | ||
1758 | /************************************************* | |
1759 | * Parse a RFC 2822 day of week * | |
1760 | *************************************************/ | |
1761 | ||
1762 | /* Parse the day of the week from a RFC 2822 date, but do not | |
1763 | decode it, because it is only for humans. | |
1764 | ||
1765 | Arguments: | |
1766 | str pointer to the start of the day of the week | |
1767 | ||
1768 | Returns: points after the parsed day or NULL on error | |
1769 | */ | |
1770 | ||
1771 | static uschar * | |
1772 | parse_day_of_week(uschar *str) | |
1773 | { | |
1774 | /* | |
1775 | day-of-week = ([FWS] day-name) / obs-day-of-week | |
1776 | ||
1777 | day-name = "Mon" / "Tue" / "Wed" / "Thu" / | |
1778 | "Fri" / "Sat" / "Sun" | |
1779 | ||
1780 | obs-day-of-week = [CFWS] day-name [CFWS] | |
1781 | */ | |
1782 | ||
5ca6d115 | 1783 | static const uschar *day_name[7]={ US"mon", US"tue", US"wed", US"thu", US"fri", US"sat", US"sun" }; |
63ac05ee MH |
1784 | int i; |
1785 | uschar day[4]; | |
1786 | ||
1787 | str=skip_comment(str); | |
1788 | for (i=0; i<3; ++i) | |
1789 | { | |
1790 | if ((day[i]=tolower(*str))=='\0') return NULL; | |
1791 | ++str; | |
1792 | } | |
1793 | day[3]='\0'; | |
5ca6d115 | 1794 | for (i=0; i<7; ++i) if (Ustrcmp(day,day_name[i])==0) break; |
63ac05ee MH |
1795 | if (i==7) return NULL; |
1796 | str=skip_comment(str); | |
1797 | return str; | |
1798 | } | |
1799 | ||
1800 | ||
1801 | /************************************************* | |
1802 | * Parse a RFC 2822 date * | |
1803 | *************************************************/ | |
1804 | ||
1805 | /* Parse the date part of a RFC 2822 date-time, extracting the | |
1806 | day, month and year. | |
1807 | ||
1808 | Arguments: | |
1809 | str pointer to the start of the date | |
1810 | d pointer to the resulting day | |
1811 | m pointer to the resulting month | |
1812 | y pointer to the resulting year | |
1813 | ||
1814 | Returns: points after the processed date or NULL on error | |
1815 | */ | |
1816 | ||
1817 | static uschar * | |
1818 | parse_date(uschar *str, int *d, int *m, int *y) | |
1819 | { | |
1820 | /* | |
1821 | date = day month year | |
1822 | ||
1823 | year = 4*DIGIT / obs-year | |
1824 | ||
1825 | obs-year = [CFWS] 2*DIGIT [CFWS] | |
1826 | ||
1827 | month = (FWS month-name FWS) / obs-month | |
1828 | ||
1829 | month-name = "Jan" / "Feb" / "Mar" / "Apr" / | |
1830 | "May" / "Jun" / "Jul" / "Aug" / | |
1831 | "Sep" / "Oct" / "Nov" / "Dec" | |
1832 | ||
1833 | obs-month = CFWS month-name CFWS | |
1834 | ||
1835 | day = ([FWS] 1*2DIGIT) / obs-day | |
1836 | ||
1837 | obs-day = [CFWS] 1*2DIGIT [CFWS] | |
1838 | */ | |
1839 | ||
1840 | uschar *c,*n; | |
5ca6d115 | 1841 | 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" }; |
63ac05ee MH |
1842 | int i; |
1843 | uschar month[4]; | |
1844 | ||
1845 | str=skip_comment(str); | |
1846 | if ((str=parse_number(str,d,1))==NULL) return NULL; | |
1847 | if (*str>='0' && *str<='9') *d=10*(*d)+(*str++-'0'); | |
1848 | c=skip_comment(str); | |
1849 | if (c==str) return NULL; | |
1850 | else str=c; | |
1851 | for (i=0; i<3; ++i) if ((month[i]=tolower(*(str+i)))=='\0') return NULL; | |
1852 | month[3]='\0'; | |
1853 | for (i=0; i<12; ++i) if (Ustrcmp(month,month_name[i])==0) break; | |
1854 | if (i==12) return NULL; | |
1855 | str+=3; | |
1856 | *m=i; | |
1857 | c=skip_comment(str); | |
1858 | if (c==str) return NULL; | |
1859 | else str=c; | |
1860 | if ((n=parse_number(str,y,4))) | |
1861 | { | |
1862 | str=n; | |
1863 | if (*y<1900) return NULL; | |
1864 | *y=*y-1900; | |
1865 | } | |
1866 | else if ((n=parse_number(str,y,2))) | |
1867 | { | |
1868 | str=skip_comment(n); | |
1869 | while (*(str-1)==' ' || *(str-1)=='\t') --str; /* match last FWS later */ | |
1870 | if (*y<50) *y+=100; | |
1871 | } | |
1872 | else return NULL; | |
1873 | return str; | |
1874 | } | |
1875 | ||
1876 | ||
1877 | /************************************************* | |
1878 | * Parse a RFC 2822 Time * | |
1879 | *************************************************/ | |
1880 | ||
1881 | /* Parse the time part of a RFC 2822 date-time, extracting the | |
1882 | hour, minute, second and timezone. | |
1883 | ||
1884 | Arguments: | |
1885 | str pointer to the start of the time | |
1886 | h pointer to the resulting hour | |
1887 | m pointer to the resulting minute | |
1888 | s pointer to the resulting second | |
1889 | z pointer to the resulting timezone (offset in seconds) | |
1890 | ||
1891 | Returns: points after the processed time or NULL on error | |
1892 | */ | |
1893 | ||
1894 | static uschar * | |
1895 | parse_time(uschar *str, int *h, int *m, int *s, int *z) | |
1896 | { | |
1897 | /* | |
1898 | time = time-of-day FWS zone | |
1899 | ||
1900 | time-of-day = hour ":" minute [ ":" second ] | |
1901 | ||
1902 | hour = 2DIGIT / obs-hour | |
1903 | ||
1904 | obs-hour = [CFWS] 2DIGIT [CFWS] | |
1905 | ||
1906 | minute = 2DIGIT / obs-minute | |
1907 | ||
1908 | obs-minute = [CFWS] 2DIGIT [CFWS] | |
1909 | ||
1910 | second = 2DIGIT / obs-second | |
1911 | ||
1912 | obs-second = [CFWS] 2DIGIT [CFWS] | |
1913 | ||
1914 | zone = (( "+" / "-" ) 4DIGIT) / obs-zone | |
1915 | ||
1916 | obs-zone = "UT" / "GMT" / ; Universal Time | |
1917 | ; North American UT | |
1918 | ; offsets | |
1919 | "EST" / "EDT" / ; Eastern: - 5/ - 4 | |
1920 | "CST" / "CDT" / ; Central: - 6/ - 5 | |
1921 | "MST" / "MDT" / ; Mountain: - 7/ - 6 | |
1922 | "PST" / "PDT" / ; Pacific: - 8/ - 7 | |
1923 | ||
1924 | %d65-73 / ; Military zones - "A" | |
1925 | %d75-90 / ; through "I" and "K" | |
1926 | %d97-105 / ; through "Z", both | |
1927 | %d107-122 ; upper and lower case | |
1928 | */ | |
1929 | ||
1930 | uschar *c; | |
1931 | ||
1932 | str=skip_comment(str); | |
1933 | if ((str=parse_number(str,h,2))==NULL) return NULL; | |
1934 | str=skip_comment(str); | |
1935 | if (*str!=':') return NULL; | |
1936 | ++str; | |
1937 | str=skip_comment(str); | |
1938 | if ((str=parse_number(str,m,2))==NULL) return NULL; | |
1939 | c=skip_comment(str); | |
1940 | if (*str==':') | |
1941 | { | |
1942 | ++str; | |
1943 | str=skip_comment(str); | |
1944 | if ((str=parse_number(str,s,2))==NULL) return NULL; | |
1945 | c=skip_comment(str); | |
1946 | } | |
1947 | if (c==str) return NULL; | |
1948 | else str=c; | |
1949 | if (*str=='+' || *str=='-') | |
1950 | { | |
1951 | int neg; | |
1952 | ||
1953 | neg=(*str=='-'); | |
1954 | ++str; | |
1955 | if ((str=parse_number(str,z,4))==NULL) return NULL; | |
1956 | *z=(*z/100)*3600+(*z%100)*60; | |
1957 | if (neg) *z=-*z; | |
1958 | } | |
1959 | else | |
1960 | { | |
1961 | char zone[5]; | |
1962 | struct { const char *name; int off; } zone_name[10]= | |
1963 | { {"gmt",0}, {"ut",0}, {"est",-5}, {"edt",-4}, {"cst",-6}, {"cdt",-5}, {"mst",-7}, {"mdt",-6}, {"pst",-8}, {"pdt",-7}}; | |
1964 | int i,j; | |
1965 | ||
1966 | for (i=0; i<4; ++i) | |
1967 | { | |
1968 | zone[i]=tolower(*(str+i)); | |
1969 | if (zone[i]<'a' || zone[i]>'z') break; | |
1970 | } | |
1971 | zone[i]='\0'; | |
1972 | for (j=0; j<10 && strcmp(zone,zone_name[j].name); ++j); | |
1973 | /* Besides zones named in the grammar, RFC 2822 says other alphabetic */ | |
1974 | /* time zones should be treated as unknown offsets. */ | |
1975 | if (j<10) | |
1976 | { | |
1977 | *z=zone_name[j].off*3600; | |
1978 | str+=i; | |
1979 | } | |
1980 | else if (zone[0]<'a' || zone[1]>'z') return 0; | |
1981 | else | |
1982 | { | |
1983 | while ((*str>='a' && *str<='z') || (*str>='A' && *str<='Z')) ++str; | |
1984 | *z=0; | |
1985 | } | |
1986 | } | |
1987 | return str; | |
1988 | } | |
1989 | ||
1990 | ||
1991 | /************************************************* | |
1992 | * Parse a RFC 2822 date-time * | |
1993 | *************************************************/ | |
1994 | ||
1995 | /* Parse a RFC 2822 date-time and return it in seconds since the epoch. | |
1996 | ||
1997 | Arguments: | |
1998 | str pointer to the start of the date-time | |
1999 | t pointer to the parsed time | |
2000 | ||
2001 | Returns: points after the processed date-time or NULL on error | |
2002 | */ | |
2003 | ||
2004 | uschar * | |
2005 | parse_date_time(uschar *str, time_t *t) | |
2006 | { | |
2007 | /* | |
2008 | date-time = [ day-of-week "," ] date FWS time [CFWS] | |
2009 | */ | |
2010 | ||
2011 | struct tm tm; | |
2012 | int zone; | |
2013 | extern char **environ; | |
2014 | char **old_environ; | |
2015 | static char gmt0[]="TZ=GMT0"; | |
2016 | static char *gmt_env[]={ gmt0, (char*)0 }; | |
ed2a4866 | 2017 | uschar *try; |
63ac05ee | 2018 | |
ed2a4866 | 2019 | if ((try=parse_day_of_week(str))) |
63ac05ee | 2020 | { |
ed2a4866 | 2021 | str=try; |
63ac05ee MH |
2022 | if (*str!=',') return 0; |
2023 | ++str; | |
2024 | } | |
2025 | if ((str=parse_date(str,&tm.tm_mday,&tm.tm_mon,&tm.tm_year))==NULL) return NULL; | |
2026 | if (*str!=' ' && *str!='\t') return NULL; | |
2027 | while (*str==' ' || *str=='\t') ++str; | |
2028 | if ((str=parse_time(str,&tm.tm_hour,&tm.tm_min,&tm.tm_sec,&zone))==NULL) return NULL; | |
2029 | tm.tm_isdst=0; | |
2030 | old_environ=environ; | |
2031 | environ=gmt_env; | |
2032 | *t=mktime(&tm); | |
2033 | environ=old_environ; | |
2034 | if (*t==-1) return NULL; | |
2035 | *t-=zone; | |
2036 | str=skip_comment(str); | |
2037 | return str; | |
30dba1e6 PH |
2038 | } |
2039 | ||
2040 | ||
2041 | ||
2042 | ||
059ec3d9 PH |
2043 | /************************************************* |
2044 | ************************************************** | |
2045 | * Stand-alone test program * | |
2046 | ************************************************** | |
2047 | *************************************************/ | |
2048 | ||
2049 | #if defined STAND_ALONE | |
2050 | int main(void) | |
2051 | { | |
2052 | int start, end, domain; | |
2053 | uschar buffer[1024]; | |
2054 | uschar outbuff[1024]; | |
2055 | ||
2056 | big_buffer = store_malloc(big_buffer_size); | |
2057 | ||
2058 | /* strip_trailing_dot = TRUE; */ | |
2059 | allow_domain_literals = TRUE; | |
2060 | ||
2061 | printf("Testing parse_fix_phrase\n"); | |
2062 | ||
2063 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2064 | { | |
2065 | buffer[Ustrlen(buffer)-1] = 0; | |
2066 | if (buffer[0] == 0) break; | |
2067 | printf("%s\n", CS parse_fix_phrase(buffer, Ustrlen(buffer), outbuff, | |
2068 | sizeof(outbuff))); | |
2069 | } | |
2070 | ||
2071 | printf("Testing parse_extract_address without group syntax and without UTF-8\n"); | |
2072 | ||
2073 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2074 | { | |
2075 | uschar *out; | |
2076 | uschar *errmess; | |
2077 | buffer[Ustrlen(buffer) - 1] = 0; | |
2078 | if (buffer[0] == 0) break; | |
2079 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); | |
2080 | if (out == NULL) printf("*** bad address: %s\n", errmess); else | |
2081 | { | |
2082 | uschar extract[1024]; | |
2083 | Ustrncpy(extract, buffer+start, end-start); | |
2084 | extract[end-start] = 0; | |
2085 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | printf("Testing parse_extract_address without group syntax but with UTF-8\n"); | |
2090 | ||
2091 | allow_utf8_domains = TRUE; | |
2092 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2093 | { | |
2094 | uschar *out; | |
2095 | uschar *errmess; | |
2096 | buffer[Ustrlen(buffer) - 1] = 0; | |
2097 | if (buffer[0] == 0) break; | |
2098 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); | |
2099 | if (out == NULL) printf("*** bad address: %s\n", errmess); else | |
2100 | { | |
2101 | uschar extract[1024]; | |
2102 | Ustrncpy(extract, buffer+start, end-start); | |
2103 | extract[end-start] = 0; | |
2104 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); | |
2105 | } | |
2106 | } | |
2107 | allow_utf8_domains = FALSE; | |
2108 | ||
2109 | printf("Testing parse_extract_address with group syntax\n"); | |
2110 | ||
2111 | parse_allow_group = TRUE; | |
2112 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2113 | { | |
2114 | uschar *out; | |
2115 | uschar *errmess; | |
2116 | uschar *s; | |
2117 | buffer[Ustrlen(buffer) - 1] = 0; | |
2118 | if (buffer[0] == 0) break; | |
2119 | s = buffer; | |
2120 | while (*s != 0) | |
2121 | { | |
2122 | uschar *ss = parse_find_address_end(s, FALSE); | |
2123 | int terminator = *ss; | |
2124 | *ss = 0; | |
2125 | out = parse_extract_address(buffer, &errmess, &start, &end, &domain, FALSE); | |
2126 | *ss = terminator; | |
2127 | ||
2128 | if (out == NULL) printf("*** bad address: %s\n", errmess); else | |
2129 | { | |
2130 | uschar extract[1024]; | |
2131 | Ustrncpy(extract, buffer+start, end-start); | |
2132 | extract[end-start] = 0; | |
2133 | printf("%s %d %d %d \"%s\"\n", out, start, end, domain, extract); | |
2134 | } | |
2135 | ||
2136 | s = ss + (terminator? 1:0); | |
2137 | while (isspace(*s)) s++; | |
2138 | } | |
2139 | } | |
2140 | ||
2141 | printf("Testing parse_find_at\n"); | |
2142 | ||
2143 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2144 | { | |
2145 | uschar *s; | |
2146 | buffer[Ustrlen(buffer)-1] = 0; | |
2147 | if (buffer[0] == 0) break; | |
2148 | s = parse_find_at(buffer); | |
2149 | if (s == NULL) printf("no @ found\n"); | |
2150 | else printf("offset = %d\n", s - buffer); | |
2151 | } | |
2152 | ||
2153 | printf("Testing parse_extract_addresses\n"); | |
2154 | ||
2155 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2156 | { | |
2157 | uschar *errmess; | |
2158 | int extracted; | |
2159 | address_item *anchor = NULL; | |
2160 | buffer[Ustrlen(buffer) - 1] = 0; | |
2161 | if (buffer[0] == 0) break; | |
2162 | if ((extracted = parse_forward_list(buffer, -1, &anchor, | |
2163 | &errmess, US"incoming.domain", NULL, NULL)) == FF_DELIVERED) | |
2164 | { | |
2165 | while (anchor != NULL) | |
2166 | { | |
2167 | address_item *addr = anchor; | |
2168 | anchor = anchor->next; | |
2169 | printf("%d %s\n", testflag(addr, af_pfr), addr->address); | |
2170 | } | |
2171 | } | |
2172 | else printf("Failed: %d %s\n", extracted, errmess); | |
2173 | } | |
2174 | ||
30dba1e6 PH |
2175 | printf("Testing parse_message_id\n"); |
2176 | ||
2177 | while (Ufgets(buffer, sizeof(buffer), stdin) != NULL) | |
2178 | { | |
2179 | uschar *s, *t, *errmess; | |
2180 | buffer[Ustrlen(buffer) - 1] = 0; | |
2181 | if (buffer[0] == 0) break; | |
2182 | s = buffer; | |
2183 | while (*s != 0) | |
2184 | { | |
2185 | s = parse_message_id(s, &t, &errmess); | |
2186 | if (errmess != NULL) | |
2187 | { | |
2188 | printf("Failed: %s\n", errmess); | |
2189 | break; | |
2190 | } | |
2191 | printf("%s\n", t); | |
2192 | } | |
2193 | } | |
2194 | ||
059ec3d9 PH |
2195 | return 0; |
2196 | } | |
2197 | ||
2198 | #endif | |
2199 | ||
2200 | /* End of parse.c */ |