Commit | Line | Data |
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99ea1c86 | 1 | /* $Cambridge: exim/src/src/transports/lmtp.c,v 1.9 2006/11/07 11:28:05 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | ||
11 | #include "../exim.h" | |
12 | #include "lmtp.h" | |
13 | ||
14 | #define PENDING_OK 256 | |
15 | ||
16 | ||
17 | /* Options specific to the lmtp transport. They must be in alphabetic | |
18 | order (note that "_" comes before the lower case letters). Those starting | |
19 | with "*" are not settable by the user but are used by the option-reading | |
20 | software for alternative value types. Some options are stored in the transport | |
21 | instance block so as to be publicly visible; these are flagged with opt_public. | |
22 | */ | |
23 | ||
24 | optionlist lmtp_transport_options[] = { | |
25 | { "batch_id", opt_stringptr | opt_public, | |
26 | (void *)offsetof(transport_instance, batch_id) }, | |
27 | { "batch_max", opt_int | opt_public, | |
28 | (void *)offsetof(transport_instance, batch_max) }, | |
29 | { "command", opt_stringptr, | |
30 | (void *)offsetof(lmtp_transport_options_block, cmd) }, | |
f1513293 PH |
31 | { "ignore_quota", opt_bool, |
32 | (void *)offsetof(lmtp_transport_options_block, ignore_quota) }, | |
0756eb3c PH |
33 | { "socket", opt_stringptr, |
34 | (void *)offsetof(lmtp_transport_options_block, skt) }, | |
35 | { "timeout", opt_time, | |
36 | (void *)offsetof(lmtp_transport_options_block, timeout) } | |
37 | }; | |
38 | ||
39 | /* Size of the options list. An extern variable has to be used so that its | |
40 | address can appear in the tables drtables.c. */ | |
41 | ||
42 | int lmtp_transport_options_count = | |
43 | sizeof(lmtp_transport_options)/sizeof(optionlist); | |
44 | ||
45 | /* Default private options block for the lmtp transport. */ | |
46 | ||
47 | lmtp_transport_options_block lmtp_transport_option_defaults = { | |
48 | NULL, /* cmd */ | |
49 | NULL, /* skt */ | |
50 | 5*60, /* timeout */ | |
f1513293 PH |
51 | 0, /* options */ |
52 | FALSE /* ignore_quota */ | |
0756eb3c PH |
53 | }; |
54 | ||
55 | ||
56 | ||
57 | /************************************************* | |
58 | * Initialization entry point * | |
59 | *************************************************/ | |
60 | ||
61 | /* Called for each instance, after its options have been read, to | |
62 | enable consistency checks to be done, or anything else that needs | |
63 | to be set up. */ | |
64 | ||
65 | void | |
66 | lmtp_transport_init(transport_instance *tblock) | |
67 | { | |
68 | lmtp_transport_options_block *ob = | |
69 | (lmtp_transport_options_block *)(tblock->options_block); | |
70 | ||
71 | /* Either the command field or the socket field must be set */ | |
72 | ||
73 | if ((ob->cmd == NULL) == (ob->skt == NULL)) | |
74 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
75 | "one (and only one) of command or socket must be set for the %s transport", | |
76 | tblock->name); | |
77 | ||
78 | /* If a fixed uid field is set, then a gid field must also be set. */ | |
79 | ||
80 | if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL) | |
81 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
82 | "user set without group for the %s transport", tblock->name); | |
83 | ||
84 | /* Set up the bitwise options for transport_write_message from the various | |
85 | driver options. Only one of body_only and headers_only can be set. */ | |
86 | ||
87 | ob->options |= | |
88 | (tblock->body_only? topt_no_headers : 0) | | |
89 | (tblock->headers_only? topt_no_body : 0) | | |
90 | (tblock->return_path_add? topt_add_return_path : 0) | | |
91 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
92 | (tblock->envelope_to_add? topt_add_envelope_to : 0) | | |
93 | topt_use_crlf | topt_end_dot; | |
94 | } | |
95 | ||
96 | ||
97 | /************************************************* | |
98 | * Check an LMTP response * | |
99 | *************************************************/ | |
100 | ||
101 | /* This function is given an errno code and the LMTP response buffer to | |
102 | analyse. It sets an appropriate message and puts the first digit of the | |
103 | response code into the yield variable. If no response was actually read, a | |
104 | suitable digit is chosen. | |
105 | ||
106 | Arguments: | |
107 | errno_value pointer to the errno value | |
108 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
109 | buffer the LMTP response buffer | |
110 | yield where to put a one-digit LMTP response code | |
111 | message where to put an errror message | |
112 | ||
113 | Returns: TRUE if a "QUIT" command should be sent, else FALSE | |
114 | */ | |
115 | ||
116 | static BOOL check_response(int *errno_value, int more_errno, uschar *buffer, | |
117 | int *yield, uschar **message) | |
118 | { | |
119 | *yield = '4'; /* Default setting is to give a temporary error */ | |
120 | ||
121 | /* Handle response timeout */ | |
122 | ||
123 | if (*errno_value == ETIMEDOUT) | |
124 | { | |
125 | *message = string_sprintf("LMTP timeout after %s", big_buffer); | |
126 | if (transport_count > 0) | |
127 | *message = string_sprintf("%s (%d bytes written)", *message, | |
128 | transport_count); | |
129 | *errno_value = 0; | |
130 | return FALSE; | |
131 | } | |
132 | ||
133 | /* Handle malformed LMTP response */ | |
134 | ||
135 | if (*errno_value == ERRNO_SMTPFORMAT) | |
136 | { | |
137 | *message = string_sprintf("Malformed LMTP response after %s: %s", | |
138 | big_buffer, string_printing(buffer)); | |
139 | return FALSE; | |
140 | } | |
141 | ||
142 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
143 | end the DATA. */ | |
144 | ||
145 | if (*errno_value == ERRNO_FILTER_FAIL) | |
146 | { | |
8e669ac1 PH |
147 | *message = string_sprintf("transport filter process failed (%d)%s", |
148 | more_errno, | |
35af9f61 | 149 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
0756eb3c PH |
150 | return FALSE; |
151 | } | |
152 | ||
153 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
154 | end the DATA. */ | |
155 | ||
156 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
157 | { | |
158 | *message = | |
159 | string_sprintf("failed to expand headers_add or headers_remove: %s", | |
160 | expand_string_message); | |
161 | return FALSE; | |
162 | } | |
163 | ||
164 | /* Handle failure to write a complete data block */ | |
165 | ||
166 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
167 | { | |
168 | *message = string_sprintf("failed to write a data block"); | |
169 | return FALSE; | |
170 | } | |
171 | ||
172 | /* Handle error responses from the remote process. */ | |
173 | ||
174 | if (buffer[0] != 0) | |
175 | { | |
176 | uschar *s = string_printing(buffer); | |
177 | *message = string_sprintf("LMTP error after %s: %s", big_buffer, s); | |
178 | *yield = buffer[0]; | |
179 | return TRUE; | |
180 | } | |
181 | ||
182 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
183 | connection closed) case, which causes deferral. Otherwise, leave the errno | |
184 | value to be interpreted. In all cases, we have to assume the connection is now | |
185 | dead. */ | |
186 | ||
187 | if (*errno_value == 0) | |
188 | { | |
189 | *errno_value = ERRNO_SMTPCLOSED; | |
190 | *message = string_sprintf("LMTP connection closed after %s", big_buffer); | |
191 | } | |
192 | ||
193 | return FALSE; | |
194 | } | |
195 | ||
196 | ||
197 | ||
198 | /************************************************* | |
199 | * Write LMTP command * | |
200 | *************************************************/ | |
201 | ||
202 | /* The formatted command is left in big_buffer so that it can be reflected in | |
203 | any error message. | |
204 | ||
205 | Arguments: | |
206 | fd the fd to write to | |
207 | format a format, starting with one of | |
208 | of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT. | |
209 | ... data for the format | |
210 | ||
211 | Returns: TRUE if successful, FALSE if not, with errno set | |
212 | */ | |
213 | ||
214 | static BOOL | |
215 | lmtp_write_command(int fd, char *format, ...) | |
216 | { | |
217 | int count, rc; | |
218 | va_list ap; | |
219 | va_start(ap, format); | |
220 | if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) | |
221 | { | |
222 | errno = ERRNO_SMTPFORMAT; | |
223 | return FALSE; | |
224 | } | |
225 | va_end(ap); | |
226 | count = Ustrlen(big_buffer); | |
227 | DEBUG(D_transport|D_v) debug_printf(" LMTP>> %s", big_buffer); | |
228 | rc = write(fd, big_buffer, count); | |
229 | big_buffer[count-2] = 0; /* remove \r\n for debug and error message */ | |
230 | if (rc > 0) return TRUE; | |
231 | DEBUG(D_transport) debug_printf("write failed: %s\n", strerror(errno)); | |
232 | return FALSE; | |
233 | } | |
234 | ||
235 | ||
236 | ||
237 | ||
238 | /************************************************* | |
239 | * Read LMTP response * | |
240 | *************************************************/ | |
241 | ||
242 | /* This function reads an LMTP response with a timeout, and returns the | |
243 | response in the given buffer. It also analyzes the first digit of the reply | |
244 | code and returns FALSE if it is not acceptable. | |
245 | ||
246 | FALSE is also returned after a reading error. In this case buffer[0] will be | |
247 | zero, and the error code will be in errno. | |
248 | ||
249 | Arguments: | |
250 | f a file to read from | |
251 | buffer where to put the response | |
252 | size the size of the buffer | |
253 | okdigit the expected first digit of the response | |
254 | timeout the timeout to use | |
255 | ||
256 | Returns: TRUE if a valid, non-error response was received; else FALSE | |
257 | */ | |
258 | ||
259 | static BOOL | |
260 | lmtp_read_response(FILE *f, uschar *buffer, int size, int okdigit, int timeout) | |
261 | { | |
262 | int count; | |
263 | uschar *ptr = buffer; | |
264 | uschar *readptr = buffer; | |
265 | ||
266 | /* Ensure errno starts out zero */ | |
267 | ||
268 | errno = 0; | |
269 | ||
270 | /* Loop for handling LMTP responses that do not all come in one line. */ | |
271 | ||
272 | for (;;) | |
273 | { | |
274 | /* If buffer is too full, something has gone wrong. */ | |
275 | ||
276 | if (size < 10) | |
277 | { | |
278 | *readptr = 0; | |
279 | errno = ERRNO_SMTPFORMAT; | |
280 | return FALSE; | |
281 | } | |
282 | ||
283 | /* Loop to cover the read getting interrupted. */ | |
284 | ||
285 | for (;;) | |
286 | { | |
287 | char *rc; | |
288 | int save_errno; | |
289 | ||
290 | *readptr = 0; /* In case nothing gets read */ | |
291 | sigalrm_seen = FALSE; | |
292 | alarm(timeout); | |
293 | rc = Ufgets(readptr, size-1, f); | |
294 | save_errno = errno; | |
295 | alarm(0); | |
296 | errno = save_errno; | |
297 | ||
298 | if (rc != NULL) break; /* A line has been read */ | |
299 | ||
300 | /* Handle timeout; must do this first because it uses EINTR */ | |
301 | ||
302 | if (sigalrm_seen) errno = ETIMEDOUT; | |
303 | ||
304 | /* If some other interrupt arrived, just retry. We presume this to be rare, | |
305 | but it can happen (e.g. the SIGUSR1 signal sent by exiwhat causes | |
306 | read() to exit). */ | |
307 | ||
308 | else if (errno == EINTR) | |
309 | { | |
310 | DEBUG(D_transport) debug_printf("EINTR while reading LMTP response\n"); | |
311 | continue; | |
312 | } | |
313 | ||
314 | /* Handle other errors, including EOF; ensure buffer is completely empty. */ | |
315 | ||
316 | buffer[0] = 0; | |
317 | return FALSE; | |
318 | } | |
319 | ||
320 | /* Adjust size in case we have to read another line, and adjust the | |
321 | count to be the length of the line we are about to inspect. */ | |
322 | ||
323 | count = Ustrlen(readptr); | |
324 | size -= count; | |
325 | count += readptr - ptr; | |
326 | ||
327 | /* See if the final two characters in the buffer are \r\n. If not, we | |
328 | have to read some more. At least, that is what we should do on a strict | |
329 | interpretation of the RFC. But accept LF as well, as we do for SMTP. */ | |
330 | ||
331 | if (ptr[count-1] != '\n') | |
332 | { | |
333 | DEBUG(D_transport) | |
334 | { | |
335 | int i; | |
336 | debug_printf("LMTP input line incomplete in one buffer:\n "); | |
337 | for (i = 0; i < count; i++) | |
338 | { | |
339 | int c = (ptr[i]); | |
340 | if (mac_isprint(c)) debug_printf("%c", c); else debug_printf("<%d>", c); | |
341 | } | |
342 | debug_printf("\n"); | |
343 | } | |
344 | readptr = ptr + count; | |
345 | continue; | |
346 | } | |
347 | ||
348 | /* Remove any whitespace at the end of the buffer. This gets rid of CR, LF | |
349 | etc. at the end. Show it, if debugging, formatting multi-line responses. */ | |
350 | ||
351 | while (count > 0 && isspace(ptr[count-1])) count--; | |
352 | ptr[count] = 0; | |
353 | ||
354 | DEBUG(D_transport|D_v) | |
355 | { | |
356 | uschar *s = ptr; | |
357 | uschar *t = ptr; | |
358 | while (*t != 0) | |
359 | { | |
360 | while (*t != 0 && *t != '\n') t++; | |
361 | debug_printf(" %s %*s\n", (s == ptr)? "LMTP<<" : " ", | |
362 | (int)(t-s), s); | |
363 | if (*t == 0) break; | |
364 | s = t = t + 1; | |
365 | } | |
366 | } | |
367 | ||
368 | /* Check the format of the response: it must start with three digits; if | |
369 | these are followed by a space or end of line, the response is complete. If | |
370 | they are followed by '-' this is a multi-line response and we must look for | |
371 | another line until the final line is reached. The only use made of multi-line | |
372 | responses is to pass them back as error messages. We therefore just | |
373 | concatenate them all within the buffer, which should be large enough to | |
374 | accept any reasonable number of lines. A multiline response may already | |
375 | have been read in one go - hence the loop here. */ | |
376 | ||
377 | for(;;) | |
378 | { | |
379 | uschar *p; | |
380 | if (count < 3 || | |
381 | !isdigit(ptr[0]) || | |
382 | !isdigit(ptr[1]) || | |
383 | !isdigit(ptr[2]) || | |
384 | (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0)) | |
385 | { | |
386 | errno = ERRNO_SMTPFORMAT; /* format error */ | |
387 | return FALSE; | |
388 | } | |
389 | ||
390 | /* If a single-line response, exit the loop */ | |
391 | ||
392 | if (ptr[3] != '-') break; | |
393 | ||
394 | /* For a multi-line response see if the next line is already read, and if | |
395 | so, stay in this loop to check it. */ | |
396 | ||
397 | p = ptr + 3; | |
398 | while (*(++p) != 0) | |
399 | { | |
400 | if (*p == '\n') | |
401 | { | |
402 | ptr = ++p; | |
403 | break; | |
404 | } | |
405 | } | |
406 | if (*p == 0) break; /* No more lines to check */ | |
407 | } | |
408 | ||
409 | /* End of response. If the last of the lines we are looking at is the final | |
410 | line, we are done. Otherwise more data has to be read. */ | |
411 | ||
412 | if (ptr[3] != '-') break; | |
413 | ||
414 | /* Move the reading pointer upwards in the buffer and insert \n in case this | |
415 | is an error message that subsequently gets printed. Set the scanning pointer | |
416 | to the reading pointer position. */ | |
417 | ||
418 | ptr += count; | |
419 | *ptr++ = '\n'; | |
420 | size--; | |
421 | readptr = ptr; | |
422 | } | |
423 | ||
424 | /* Return a value that depends on the LMTP return code. Ensure that errno is | |
425 | zero, because the caller of this function looks at errno when FALSE is | |
426 | returned, to distinguish between an unexpected return code and other errors | |
427 | such as timeouts, lost connections, etc. */ | |
428 | ||
429 | errno = 0; | |
430 | return buffer[0] == okdigit; | |
431 | } | |
432 | ||
433 | ||
434 | ||
435 | ||
436 | ||
437 | ||
438 | /************************************************* | |
439 | * Main entry point * | |
440 | *************************************************/ | |
441 | ||
442 | /* See local README for interface details. For setup-errors, this transport | |
443 | returns FALSE, indicating that the first address has the status for all; in | |
444 | normal cases it returns TRUE, indicating that each address has its own status | |
445 | set. */ | |
446 | ||
447 | BOOL | |
448 | lmtp_transport_entry( | |
449 | transport_instance *tblock, /* data for this instantiation */ | |
450 | address_item *addrlist) /* address(es) we are working on */ | |
451 | { | |
452 | pid_t pid = 0; | |
453 | FILE *out; | |
454 | lmtp_transport_options_block *ob = | |
455 | (lmtp_transport_options_block *)(tblock->options_block); | |
456 | struct sockaddr_un sockun; /* don't call this "sun" ! */ | |
457 | int timeout = ob->timeout; | |
458 | int fd_in = -1, fd_out = -1; | |
459 | int code, save_errno; | |
460 | BOOL send_data; | |
461 | BOOL yield = FALSE; | |
462 | address_item *addr; | |
f1513293 | 463 | uschar *igquotstr = US""; |
0756eb3c PH |
464 | uschar *sockname = NULL; |
465 | uschar **argv; | |
466 | uschar buffer[256]; | |
467 | ||
468 | DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name); | |
469 | ||
470 | /* Initialization ensures that either a command or a socket is specified, but | |
471 | not both. When a command is specified, call the common function for creating an | |
472 | argument list and expanding the items. */ | |
473 | ||
474 | if (ob->cmd != NULL) | |
475 | { | |
476 | DEBUG(D_transport) debug_printf("using command %s\n", ob->cmd); | |
477 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
478 | if (!transport_set_up_command(&argv, ob->cmd, TRUE, PANIC, addrlist, buffer, | |
479 | NULL)) | |
480 | return FALSE; | |
481 | } | |
482 | ||
483 | /* When a socket is specified, expand the string and create a socket. */ | |
484 | ||
485 | else | |
486 | { | |
487 | DEBUG(D_transport) debug_printf("using socket %s\n", ob->skt); | |
488 | sockname = expand_string(ob->skt); | |
489 | if (sockname == NULL) | |
490 | { | |
491 | addrlist->message = string_sprintf("Expansion of \"%s\" (socket setting " | |
492 | "for %s transport) failed: %s", ob->skt, tblock->name, | |
493 | expand_string_message); | |
494 | return FALSE; | |
495 | } | |
496 | if ((fd_in = fd_out = socket(PF_UNIX, SOCK_STREAM, 0)) == -1) | |
497 | { | |
498 | addrlist->message = string_sprintf( | |
499 | "Failed to create socket %s for %s transport: %s", | |
500 | ob->skt, tblock->name, strerror(errno)); | |
501 | return FALSE; | |
502 | } | |
503 | } | |
504 | ||
505 | /* If the -N option is set, can't do any more. Presume all has gone well. */ | |
506 | ||
507 | if (dont_deliver) | |
508 | { | |
509 | DEBUG(D_transport) | |
510 | debug_printf("*** delivery by %s transport bypassed by -N option", | |
511 | tblock->name); | |
512 | addrlist->transport_return = OK; | |
513 | return FALSE; | |
514 | } | |
515 | ||
516 | /* As this is a local transport, we are already running with the required | |
517 | uid/gid and current directory. Request that the new process be a process group | |
518 | leader, so we can kill it and all its children on an error. */ | |
519 | ||
520 | if (ob->cmd != NULL) | |
521 | { | |
522 | if ((pid = child_open(argv, NULL, 0, &fd_in, &fd_out, TRUE)) < 0) | |
523 | { | |
524 | addrlist->message = string_sprintf( | |
525 | "Failed to create child process for %s transport: %s", tblock->name, | |
526 | strerror(errno)); | |
527 | return FALSE; | |
528 | } | |
529 | } | |
530 | ||
531 | /* For a socket, try to make the connection */ | |
532 | ||
533 | else | |
534 | { | |
535 | sockun.sun_family = AF_UNIX; | |
536 | sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname); | |
537 | if(connect(fd_out, (struct sockaddr *)(&sockun), sizeof(sockun)) == -1) | |
538 | { | |
539 | addrlist->message = string_sprintf( | |
540 | "Failed to connect to socket %s for %s transport: %s", | |
541 | sockun.sun_path, tblock->name, strerror(errno)); | |
542 | return FALSE; | |
543 | } | |
544 | } | |
545 | ||
546 | /* Make the output we are going to read into a file. */ | |
547 | ||
548 | out = fdopen(fd_out, "rb"); | |
549 | ||
550 | /* Now we must implement the LMTP protocol. It is like SMTP, except that after | |
551 | the end of the message, a return code for every accepted RCPT TO is sent. This | |
552 | allows for message+recipient checks after the message has been received. */ | |
553 | ||
554 | /* First thing is to wait for an initial greeting. */ | |
555 | ||
556 | Ustrcpy(big_buffer, "initial connection"); | |
557 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', | |
558 | timeout)) goto RESPONSE_FAILED; | |
559 | ||
560 | /* Next, we send a LHLO command, and expect a positive response */ | |
561 | ||
562 | if (!lmtp_write_command(fd_in, "%s %s\r\n", "LHLO", | |
563 | primary_hostname)) goto WRITE_FAILED; | |
564 | ||
565 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', | |
566 | timeout)) goto RESPONSE_FAILED; | |
567 | ||
f1513293 PH |
568 | /* If the ignore_quota option is set, note whether the server supports the |
569 | IGNOREQUOTA option, and if so, set an appropriate addition for RCPT. */ | |
570 | ||
571 | if (ob->ignore_quota) | |
572 | igquotstr = (pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, | |
573 | Ustrlen(CS buffer), 0, PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
574 | ||
0756eb3c PH |
575 | /* Now the envelope sender */ |
576 | ||
577 | if (!lmtp_write_command(fd_in, "MAIL FROM:<%s>\r\n", return_path)) | |
578 | goto WRITE_FAILED; | |
579 | ||
580 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) | |
e97957bc PH |
581 | { |
582 | if (errno == 0 && buffer[0] == '4') | |
583 | { | |
584 | errno = ERRNO_MAIL4XX; | |
585 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
586 | } | |
0756eb3c | 587 | goto RESPONSE_FAILED; |
e97957bc | 588 | } |
0756eb3c PH |
589 | |
590 | /* Next, we hand over all the recipients. Some may be permanently or | |
591 | temporarily rejected; others may be accepted, for now. */ | |
592 | ||
593 | send_data = FALSE; | |
594 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
595 | { | |
f1513293 PH |
596 | if (!lmtp_write_command(fd_in, "RCPT TO:<%s>%s\r\n", |
597 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr)) | |
0756eb3c PH |
598 | goto WRITE_FAILED; |
599 | if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) | |
600 | { | |
601 | send_data = TRUE; | |
602 | addr->transport_return = PENDING_OK; | |
603 | } | |
604 | else | |
605 | { | |
606 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
607 | addr->message = string_sprintf("LMTP error after %s: %s", big_buffer, | |
608 | string_printing(buffer)); | |
99ea1c86 | 609 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
0756eb3c PH |
610 | if (buffer[0] == '5') addr->transport_return = FAIL; else |
611 | { | |
0756eb3c | 612 | addr->basic_errno = ERRNO_RCPT4XX; |
e97957bc | 613 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
0756eb3c PH |
614 | } |
615 | } | |
616 | } | |
617 | ||
618 | /* Now send the text of the message if there were any good recipients. */ | |
619 | ||
620 | if (send_data) | |
621 | { | |
622 | BOOL ok; | |
623 | ||
624 | if (!lmtp_write_command(fd_in, "DATA\r\n")) goto WRITE_FAILED; | |
625 | if (!lmtp_read_response(out, buffer, sizeof(buffer), '3', timeout)) | |
e97957bc PH |
626 | { |
627 | if (errno == 0 && buffer[0] == '4') | |
628 | { | |
629 | errno = ERRNO_DATA4XX; | |
630 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
631 | } | |
0756eb3c | 632 | goto RESPONSE_FAILED; |
e97957bc | 633 | } |
0756eb3c PH |
634 | |
635 | sigalrm_seen = FALSE; | |
636 | transport_write_timeout = timeout; | |
637 | Ustrcpy(big_buffer, "sending data block"); /* For error messages */ | |
638 | DEBUG(D_transport|D_v) | |
639 | debug_printf(" LMTP>> writing message and terminating \".\"\n"); | |
640 | ||
641 | transport_count = 0; | |
642 | ok = transport_write_message(addrlist, fd_in, ob->options, 0, | |
643 | tblock->add_headers, tblock->remove_headers, US".", US"..", | |
644 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
645 | ||
646 | /* Failure can either be some kind of I/O disaster (including timeout), | |
647 | or the failure of a transport filter or the expansion of added headers. */ | |
648 | ||
649 | if (!ok) | |
650 | { | |
651 | buffer[0] = 0; /* There hasn't been a response */ | |
652 | goto RESPONSE_FAILED; | |
653 | } | |
654 | ||
655 | Ustrcpy(big_buffer, "end of data"); /* For error messages */ | |
656 | ||
657 | /* We now expect a response for every address that was accepted above, | |
658 | in the same order. For those that get a response, their status is fixed; | |
659 | any that are accepted have been handed over, even if later responses crash - | |
660 | at least, that's how I read RFC 2033. */ | |
661 | ||
662 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
663 | { | |
664 | if (addr->transport_return != PENDING_OK) continue; | |
665 | ||
666 | if (lmtp_read_response(out, buffer, sizeof(buffer), '2', timeout)) | |
667 | addr->transport_return = OK; | |
668 | ||
669 | /* If the response has failed badly, use it for all the remaining pending | |
670 | addresses and give up. */ | |
671 | ||
672 | else if (errno != 0 || buffer[0] == 0) | |
673 | { | |
674 | address_item *a; | |
675 | save_errno = errno; | |
676 | check_response(&save_errno, addr->more_errno, buffer, &code, | |
677 | &(addr->message)); | |
678 | addr->transport_return = (code == '5')? FAIL : DEFER; | |
679 | for (a = addr->next; a != NULL; a = a->next) | |
680 | { | |
681 | if (a->transport_return != PENDING_OK) continue; | |
682 | a->basic_errno = addr->basic_errno; | |
683 | a->message = addr->message; | |
684 | a->transport_return = addr->transport_return; | |
685 | } | |
686 | break; | |
687 | } | |
688 | ||
689 | /* Otherwise, it's an LMTP error code return for one address */ | |
690 | ||
691 | else | |
692 | { | |
e97957bc PH |
693 | if (buffer[0] == '4') |
694 | { | |
695 | addr->basic_errno = ERRNO_DATA4XX; | |
696 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
697 | } | |
0756eb3c PH |
698 | addr->message = string_sprintf("LMTP error after %s: %s", big_buffer, |
699 | string_printing(buffer)); | |
700 | addr->transport_return = (buffer[0] == '5')? FAIL : DEFER; | |
99ea1c86 | 701 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
0756eb3c PH |
702 | } |
703 | } | |
704 | } | |
705 | ||
706 | /* The message transaction has completed successfully - this doesn't mean that | |
707 | all the addresses have necessarily been transferred, but each has its status | |
708 | set, so we change the yield to TRUE. */ | |
709 | ||
710 | yield = TRUE; | |
711 | (void) lmtp_write_command(fd_in, "QUIT\r\n"); | |
712 | (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1); | |
713 | ||
714 | goto RETURN; | |
715 | ||
716 | ||
717 | /* Come here if any call to read_response, other than a response after the data | |
718 | phase, failed. Put the error in the top address - this will be replicated | |
e97957bc PH |
719 | because the yield is still FALSE. (But omit ETIMEDOUT, as there will already be |
720 | a suitable message.) Analyse the error, and if if isn't too bad, send a QUIT | |
721 | command. Wait for the response with a short timeout, so we don't wind up this | |
722 | process before the far end has had time to read the QUIT. */ | |
0756eb3c PH |
723 | |
724 | RESPONSE_FAILED: | |
725 | ||
726 | save_errno = errno; | |
e97957bc | 727 | if (errno != ETIMEDOUT && errno != 0) addrlist->basic_errno = errno; |
0756eb3c PH |
728 | addrlist->message = NULL; |
729 | ||
730 | if (check_response(&save_errno, addrlist->more_errno, | |
731 | buffer, &code, &(addrlist->message))) | |
732 | { | |
733 | (void) lmtp_write_command(fd_in, "QUIT\r\n"); | |
734 | (void) lmtp_read_response(out, buffer, sizeof(buffer), '2', 1); | |
735 | } | |
736 | ||
737 | addrlist->transport_return = (code == '5')? FAIL : DEFER; | |
738 | if (code == '4' && save_errno > 0) | |
739 | addrlist->message = string_sprintf("%s: %s", addrlist->message, | |
740 | strerror(save_errno)); | |
741 | goto KILL_AND_RETURN; | |
742 | ||
743 | /* Come here if there are errors during writing of a command or the message | |
744 | itself. This error will be applied to all the addresses. */ | |
745 | ||
746 | WRITE_FAILED: | |
747 | ||
748 | addrlist->transport_return = PANIC; | |
749 | addrlist->basic_errno = errno; | |
750 | if (errno == ERRNO_CHHEADER_FAIL) | |
751 | addrlist->message = | |
752 | string_sprintf("Failed to expand headers_add or headers_remove: %s", | |
753 | expand_string_message); | |
754 | else if (errno == ERRNO_FILTER_FAIL) | |
755 | addrlist->message = string_sprintf("Filter process failure"); | |
756 | else if (errno == ERRNO_WRITEINCOMPLETE) | |
757 | addrlist->message = string_sprintf("Failed repeatedly to write data"); | |
758 | else if (errno == ERRNO_SMTPFORMAT) | |
759 | addrlist->message = US"overlong LMTP command generated"; | |
760 | else | |
761 | addrlist->message = string_sprintf("Error %d", errno); | |
762 | ||
763 | /* Come here after errors. Kill off the process. */ | |
764 | ||
765 | KILL_AND_RETURN: | |
766 | ||
767 | if (pid > 0) killpg(pid, SIGKILL); | |
768 | ||
769 | /* Come here from all paths after the subprocess is created. Wait for the | |
770 | process, but with a timeout. */ | |
771 | ||
772 | RETURN: | |
773 | ||
774 | (void)child_close(pid, timeout); | |
775 | ||
f1e894f3 PH |
776 | if (fd_in >= 0) (void)close(fd_in); |
777 | if (fd_out >= 0) (void)fclose(out); | |
0756eb3c PH |
778 | |
779 | DEBUG(D_transport) | |
780 | debug_printf("%s transport yields %d\n", tblock->name, yield); | |
781 | ||
782 | return yield; | |
783 | } | |
784 | ||
785 | /* End of transport/lmtp.c */ |