Commit | Line | Data |
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059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
d4e5e70b | 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
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 | |
4c04137d | 190 | Returns: new character pointer |
059ec3d9 PH |
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) | |
059ec3d9 | 553 | if (*s != term) |
059ec3d9 PH |
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 | } | |
059ec3d9 PH |
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 | |
1eccaa59 PH |
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. | |
059ec3d9 PH |
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); | |
b6040544 | 664 | if (*errorptr) |
059ec3d9 PH |
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 <> | |
b6040544 JH |
689 | round <route-addr>s. If strip_excess_angle_brackets is set, allow a limited |
690 | number of them, as long as they match. */ | |
059ec3d9 PH |
691 | |
692 | if (*s == '<') | |
693 | { | |
694 | uschar *domainptr = yield; | |
695 | BOOL source_routed = FALSE; | |
696 | int bracket_count = 1; | |
697 | ||
698 | s++; | |
b6040544 JH |
699 | if (strip_excess_angle_brackets) while (*s == '<') |
700 | { | |
701 | if(bracket_count++ > 5) FAILED(US"angle-brackets nested too deep"); | |
702 | s++; | |
703 | } | |
059ec3d9 PH |
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); | |
b6040544 | 717 | if (*errorptr) goto PARSE_FAILED; |
059ec3d9 PH |
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); | |
b6040544 | 735 | if (*errorptr) goto PARSE_FAILED; |
059ec3d9 PH |
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 | { | |
b6040544 JH |
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); | |
059ec3d9 PH |
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 | { | |
7ade712c | 800 | *errorptr = string_sprintf("malformed address: %.32s may not follow %.*s", |
059ec3d9 PH |
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 | ||
9d4319df | 820 | return yield; |
059ec3d9 PH |
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 | ||
55414b25 JH |
869 | const uschar * |
870 | parse_quote_2047(const uschar *string, int len, uschar *charset, uschar *buffer, | |
46218253 | 871 | int buffer_size, BOOL fold) |
059ec3d9 | 872 | { |
55414b25 | 873 | const 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; | |
94431adb | 913 | } |
86ae49a6 | 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 | ||
55414b25 JH |
988 | const uschar * |
989 | parse_fix_phrase(const uschar *phrase, int len, uschar *buffer, int buffer_size) | |
059ec3d9 PH |
990 | { |
991 | int ch, i; | |
992 | BOOL quoted = FALSE; | |
55414b25 JH |
993 | const uschar *s, *end; |
994 | uschar *t, *yield; | |
059ec3d9 PH |
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, | |
46218253 | 1006 | buffer_size, FALSE); |
059ec3d9 PH |
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 | { | |
55414b25 | 1123 | const uschar *ss = s; /* uschar after '(' */ |
059ec3d9 PH |
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, | |
55414b25 | 1249 | uschar **error, const uschar *incoming_domain, uschar *directory, |
059ec3d9 PH |
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 | ||
10c50704 | 1432 | if (directory) |
059ec3d9 PH |
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 | ||
10c50704 JH |
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 | { | |
4dc2379a | 1451 | int fd = open(CS directory, O_RDONLY); |
10c50704 JH |
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 | ||
4dc2379a | 1467 | fd2 = openat(fd, CS q, O_RDONLY|O_NOFOLLOW); |
ad6f5499 JH |
1468 | close(fd); |
1469 | *p = temp; | |
1470 | if (fd2 < 0) | |
10c50704 JH |
1471 | { |
1472 | *error = string_sprintf("failed to open %s (component of included " | |
1473 | "file); could be symbolic link", filename); | |
1474 | return FF_ERROR; | |
1475 | } | |
10c50704 | 1476 | fd = fd2; |
10c50704 JH |
1477 | } |
1478 | f = fdopen(fd, "rb"); | |
1479 | } | |
1480 | #else | |
059ec3d9 PH |
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 | ||
10c50704 | 1487 | while (*p) |
059ec3d9 PH |
1488 | { |
1489 | int temp; | |
10c50704 | 1490 | while (*++p && *p != '/'); |
059ec3d9 PH |
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 | } | |
10c50704 | 1510 | #endif |
059ec3d9 PH |
1511 | } |
1512 | ||
10c50704 JH |
1513 | #ifdef EXIM_HAVE_OPENAT |
1514 | else | |
1515 | #endif | |
1516 | /* Open and stat the file */ | |
1517 | f = Ufopen(filename, "rb"); | |
059ec3d9 | 1518 | |
10c50704 | 1519 | if (!f) |
059ec3d9 PH |
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)); | |
f1e894f3 | 1529 | (void)fclose(f); |
059ec3d9 PH |
1530 | return FF_INCLUDEFAIL; |
1531 | } | |
1532 | ||
1533 | /* If directory was checked, double check that we opened a regular file */ | |
1534 | ||
10c50704 | 1535 | if (directory && (statbuf.st_mode & S_IFMT) != S_IFREG) |
059ec3d9 PH |
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)); | |
f1e894f3 | 1556 | (void)fclose(f); |
059ec3d9 PH |
1557 | return FF_ERROR; |
1558 | } | |
1559 | filebuf[statbuf.st_size] = 0; | |
f1e894f3 | 1560 | (void)fclose(f); |
059ec3d9 PH |
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 | ||
10c50704 | 1567 | if (addr) |
059ec3d9 | 1568 | { |
10c50704 | 1569 | for (last = addr; last->next; last = last->next) count++; |
059ec3d9 PH |
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 | ||
30dba1e6 PH |
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; | |
63ac05ee MH |
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 | ||
5ca6d115 | 1825 | static const uschar *day_name[7]={ US"mon", US"tue", US"wed", US"thu", US"fri", US"sat", US"sun" }; |
63ac05ee MH |
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'; | |
5ca6d115 | 1836 | for (i=0; i<7; ++i) if (Ustrcmp(day,day_name[i])==0) break; |
63ac05ee MH |
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; | |
5ca6d115 | 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" }; |
63ac05ee MH |
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 }; | |
ed2a4866 | 2059 | uschar *try; |
63ac05ee | 2060 | |
ed2a4866 | 2061 | if ((try=parse_day_of_week(str))) |
63ac05ee | 2062 | { |
ed2a4866 | 2063 | str=try; |
63ac05ee MH |
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; | |
30dba1e6 PH |
2080 | } |
2081 | ||
2082 | ||
2083 | ||
2084 | ||
059ec3d9 PH |
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 | ||
30dba1e6 PH |
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 | ||
059ec3d9 PH |
2237 | return 0; |
2238 | } | |
2239 | ||
2240 | #endif | |
2241 | ||
2242 | /* End of parse.c */ |