Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* A number of functions for driving outgoing SMTP calls. */ | |
9 | ||
10 | ||
11 | #include "exim.h" | |
7eb6c37c | 12 | #include "transports/smtp.h" |
059ec3d9 PH |
13 | |
14 | ||
15 | ||
16 | /************************************************* | |
17 | * Find an outgoing interface * | |
18 | *************************************************/ | |
19 | ||
20 | /* This function is called from the smtp transport and also from the callout | |
21 | code in verify.c. Its job is to expand a string to get a list of interfaces, | |
22 | and choose a suitable one (IPv4 or IPv6) for the outgoing address. | |
23 | ||
24 | Arguments: | |
25 | istring string interface setting, may be NULL, meaning "any", in | |
26 | which case the function does nothing | |
27 | host_af AF_INET or AF_INET6 for the outgoing IP address | |
28 | addr the mail address being handled (for setting errors) | |
059ec3d9 PH |
29 | interface point this to the interface |
30 | msg to add to any error message | |
31 | ||
32 | Returns: TRUE on success, FALSE on failure, with error message | |
33 | set in addr and transport_return set to PANIC | |
34 | */ | |
35 | ||
36 | BOOL | |
37 | smtp_get_interface(uschar *istring, int host_af, address_item *addr, | |
6f6dedcc | 38 | uschar **interface, uschar *msg) |
059ec3d9 | 39 | { |
55414b25 | 40 | const uschar * expint; |
059ec3d9 PH |
41 | uschar *iface; |
42 | int sep = 0; | |
43 | ||
44 | if (istring == NULL) return TRUE; | |
45 | ||
46 | expint = expand_string(istring); | |
47 | if (expint == NULL) | |
48 | { | |
49 | if (expand_string_forcedfail) return TRUE; | |
50 | addr->transport_return = PANIC; | |
51 | addr->message = string_sprintf("failed to expand \"interface\" " | |
52 | "option for %s: %s", msg, expand_string_message); | |
53 | return FALSE; | |
54 | } | |
55 | ||
059ec3d9 PH |
56 | while (isspace(*expint)) expint++; |
57 | if (*expint == 0) return TRUE; | |
58 | ||
59 | while ((iface = string_nextinlist(&expint, &sep, big_buffer, | |
60 | big_buffer_size)) != NULL) | |
61 | { | |
62 | if (string_is_ip_address(iface, NULL) == 0) | |
63 | { | |
64 | addr->transport_return = PANIC; | |
65 | addr->message = string_sprintf("\"%s\" is not a valid IP " | |
66 | "address for the \"interface\" option for %s", | |
67 | iface, msg); | |
68 | return FALSE; | |
69 | } | |
70 | ||
71 | if (((Ustrchr(iface, ':') == NULL)? AF_INET:AF_INET6) == host_af) | |
72 | break; | |
73 | } | |
74 | ||
75 | if (iface != NULL) *interface = string_copy(iface); | |
76 | return TRUE; | |
77 | } | |
78 | ||
79 | ||
80 | ||
81 | /************************************************* | |
82 | * Find an outgoing port * | |
83 | *************************************************/ | |
84 | ||
85 | /* This function is called from the smtp transport and also from the callout | |
86 | code in verify.c. Its job is to find a port number. Note that getservbyname() | |
87 | produces the number in network byte order. | |
88 | ||
89 | Arguments: | |
90 | rstring raw (unexpanded) string representation of the port | |
91 | addr the mail address being handled (for setting errors) | |
92 | port stick the port in here | |
93 | msg for adding to error message | |
94 | ||
95 | Returns: TRUE on success, FALSE on failure, with error message set | |
96 | in addr, and transport_return set to PANIC | |
97 | */ | |
98 | ||
99 | BOOL | |
100 | smtp_get_port(uschar *rstring, address_item *addr, int *port, uschar *msg) | |
101 | { | |
102 | uschar *pstring = expand_string(rstring); | |
103 | ||
104 | if (pstring == NULL) | |
105 | { | |
106 | addr->transport_return = PANIC; | |
107 | addr->message = string_sprintf("failed to expand \"%s\" (\"port\" option) " | |
108 | "for %s: %s", rstring, msg, expand_string_message); | |
109 | return FALSE; | |
110 | } | |
111 | ||
112 | if (isdigit(*pstring)) | |
113 | { | |
114 | uschar *end; | |
115 | *port = Ustrtol(pstring, &end, 0); | |
116 | if (end != pstring + Ustrlen(pstring)) | |
117 | { | |
118 | addr->transport_return = PANIC; | |
119 | addr->message = string_sprintf("invalid port number for %s: %s", msg, | |
120 | pstring); | |
121 | return FALSE; | |
122 | } | |
123 | } | |
124 | ||
125 | else | |
126 | { | |
127 | struct servent *smtp_service = getservbyname(CS pstring, "tcp"); | |
128 | if (smtp_service == NULL) | |
129 | { | |
130 | addr->transport_return = PANIC; | |
131 | addr->message = string_sprintf("TCP port \"%s\" is not defined for %s", | |
132 | pstring, msg); | |
133 | return FALSE; | |
134 | } | |
135 | *port = ntohs(smtp_service->s_port); | |
136 | } | |
137 | ||
138 | return TRUE; | |
139 | } | |
140 | ||
141 | ||
142 | ||
143 | ||
059ec3d9 | 144 | int |
7eb6c37c JH |
145 | smtp_sock_connect(host_item * host, int host_af, int port, uschar * interface, |
146 | transport_instance * tb, int timeout) | |
059ec3d9 | 147 | { |
7eb6c37c JH |
148 | smtp_transport_options_block * ob = |
149 | (smtp_transport_options_block *)tb->options_block; | |
150 | const uschar * dscp = ob->dscp; | |
9e4f5962 PP |
151 | int dscp_value; |
152 | int dscp_level; | |
153 | int dscp_option; | |
059ec3d9 | 154 | int sock; |
7eb6c37c JH |
155 | int on = 1; |
156 | int save_errno = 0; | |
059ec3d9 | 157 | |
0cbf2b82 | 158 | #ifndef DISABLE_EVENT |
7eb6c37c JH |
159 | deliver_host_address = host->address; |
160 | deliver_host_port = port; | |
161 | if (event_raise(tb->event_action, US"tcp:connect", NULL)) return -1; | |
a7538db1 JH |
162 | #endif |
163 | ||
059ec3d9 PH |
164 | if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return -1; |
165 | ||
166 | /* Set TCP_NODELAY; Exim does its own buffering. */ | |
167 | ||
d4ff61d1 JH |
168 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, US &on, sizeof(on))) |
169 | HDEBUG(D_transport|D_acl|D_v) | |
170 | debug_printf("failed to set NODELAY: %s ", strerror(errno)); | |
059ec3d9 | 171 | |
9e4f5962 PP |
172 | /* Set DSCP value, if we can. For now, if we fail to set the value, we don't |
173 | bomb out, just log it and continue in default traffic class. */ | |
174 | ||
175 | if (dscp && dscp_lookup(dscp, host_af, &dscp_level, &dscp_option, &dscp_value)) | |
176 | { | |
177 | HDEBUG(D_transport|D_acl|D_v) | |
36a3ae5f | 178 | debug_printf("DSCP \"%s\"=%x ", dscp, dscp_value); |
9e4f5962 PP |
179 | if (setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)) < 0) |
180 | HDEBUG(D_transport|D_acl|D_v) | |
181 | debug_printf("failed to set DSCP: %s ", strerror(errno)); | |
182 | /* If the kernel supports IPv4 and IPv6 on an IPv6 socket, we need to set the | |
183 | option for both; ignore failures here */ | |
184 | if (host_af == AF_INET6 && | |
185 | dscp_lookup(dscp, AF_INET, &dscp_level, &dscp_option, &dscp_value)) | |
9e4f5962 | 186 | (void) setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)); |
9e4f5962 PP |
187 | } |
188 | ||
059ec3d9 PH |
189 | /* Bind to a specific interface if requested. Caller must ensure the interface |
190 | is the same type (IPv4 or IPv6) as the outgoing address. */ | |
191 | ||
7eb6c37c | 192 | if (interface && ip_bind(sock, host_af, interface, 0) < 0) |
059ec3d9 PH |
193 | { |
194 | save_errno = errno; | |
195 | HDEBUG(D_transport|D_acl|D_v) | |
196 | debug_printf("unable to bind outgoing SMTP call to %s: %s", interface, | |
197 | strerror(errno)); | |
198 | } | |
199 | ||
200 | /* Connect to the remote host, and add keepalive to the socket before returning | |
201 | it, if requested. */ | |
202 | ||
203 | else if (ip_connect(sock, host_af, host->address, port, timeout) < 0) | |
204 | save_errno = errno; | |
205 | ||
206 | /* Either bind() or connect() failed */ | |
207 | ||
208 | if (save_errno != 0) | |
209 | { | |
8e669ac1 | 210 | HDEBUG(D_transport|D_acl|D_v) |
4deaf07d PH |
211 | { |
212 | debug_printf("failed: %s", CUstrerror(save_errno)); | |
8e669ac1 | 213 | if (save_errno == ETIMEDOUT) |
4deaf07d | 214 | debug_printf(" (timeout=%s)", readconf_printtime(timeout)); |
8e669ac1 PH |
215 | debug_printf("\n"); |
216 | } | |
f1e894f3 | 217 | (void)close(sock); |
059ec3d9 PH |
218 | errno = save_errno; |
219 | return -1; | |
220 | } | |
221 | ||
222 | /* Both bind() and connect() succeeded */ | |
223 | ||
224 | else | |
225 | { | |
41c7c167 PH |
226 | union sockaddr_46 interface_sock; |
227 | EXIM_SOCKLEN_T size = sizeof(interface_sock); | |
059ec3d9 | 228 | HDEBUG(D_transport|D_acl|D_v) debug_printf("connected\n"); |
41c7c167 PH |
229 | if (getsockname(sock, (struct sockaddr *)(&interface_sock), &size) == 0) |
230 | sending_ip_address = host_ntoa(-1, &interface_sock, NULL, &sending_port); | |
231 | else | |
232 | { | |
233 | log_write(0, LOG_MAIN | ((errno == ECONNRESET)? 0 : LOG_PANIC), | |
234 | "getsockname() failed: %s", strerror(errno)); | |
235 | close(sock); | |
236 | return -1; | |
237 | } | |
7eb6c37c | 238 | if (ob->keepalive) ip_keepalive(sock, host->address, TRUE); |
059ec3d9 PH |
239 | return sock; |
240 | } | |
241 | } | |
242 | ||
7eb6c37c JH |
243 | /************************************************* |
244 | * Connect to remote host * | |
245 | *************************************************/ | |
246 | ||
247 | /* Create a socket, and connect it to a remote host. IPv6 addresses are | |
248 | detected by checking for a colon in the address. AF_INET6 is defined even on | |
249 | non-IPv6 systems, to enable the code to be less messy. However, on such systems | |
250 | host->address will always be an IPv4 address. | |
251 | ||
252 | The port field in the host item is used if it is set (usually router from SRV | |
253 | records or elsewhere). In other cases, the default passed as an argument is | |
254 | used, and the host item is updated with its value. | |
255 | ||
256 | Arguments: | |
257 | host host item containing name and address (and sometimes port) | |
258 | host_af AF_INET or AF_INET6 | |
259 | port default remote port to connect to, in host byte order, for those | |
260 | hosts whose port setting is PORT_NONE | |
261 | interface outgoing interface address or NULL | |
262 | timeout timeout value or 0 | |
263 | tb transport | |
264 | ||
265 | Returns: connected socket number, or -1 with errno set | |
266 | */ | |
267 | ||
268 | int | |
269 | smtp_connect(host_item *host, int host_af, int port, uschar *interface, | |
270 | int timeout, transport_instance * tb) | |
271 | { | |
f0989ec0 | 272 | #ifdef SUPPORT_SOCKS |
7eb6c37c JH |
273 | smtp_transport_options_block * ob = |
274 | (smtp_transport_options_block *)tb->options_block; | |
0539a19d | 275 | #endif |
7eb6c37c JH |
276 | |
277 | if (host->port != PORT_NONE) | |
278 | { | |
279 | HDEBUG(D_transport|D_acl|D_v) | |
280 | debug_printf("Transport port=%d replaced by host-specific port=%d\n", port, | |
281 | host->port); | |
282 | port = host->port; | |
283 | } | |
284 | else host->port = port; /* Set the port actually used */ | |
285 | ||
055e2cb4 JH |
286 | callout_address = string_sprintf("[%s]:%d", host->address, port); |
287 | ||
7eb6c37c JH |
288 | HDEBUG(D_transport|D_acl|D_v) |
289 | { | |
290 | uschar * s = US" "; | |
291 | if (interface) s = string_sprintf(" from %s ", interface); | |
f0989ec0 | 292 | #ifdef SUPPORT_SOCKS |
7eb6c37c JH |
293 | if (ob->socks_proxy) s = string_sprintf("%svia proxy ", s); |
294 | #endif | |
055e2cb4 | 295 | debug_printf("Connecting to %s %s%s... ", host->name, callout_address, s); |
7eb6c37c JH |
296 | } |
297 | ||
298 | /* Create and connect the socket */ | |
299 | ||
f0989ec0 | 300 | #ifdef SUPPORT_SOCKS |
7eb6c37c JH |
301 | if (ob->socks_proxy) |
302 | return socks_sock_connect(host, host_af, port, interface, tb, timeout); | |
303 | #endif | |
304 | ||
305 | return smtp_sock_connect(host, host_af, port, interface, tb, timeout); | |
306 | } | |
307 | ||
059ec3d9 PH |
308 | |
309 | /************************************************* | |
310 | * Flush outgoing command buffer * | |
311 | *************************************************/ | |
312 | ||
313 | /* This function is called only from smtp_write_command() below. It flushes | |
314 | the buffer of outgoing commands. There is more than one in the buffer only when | |
315 | pipelining. | |
316 | ||
317 | Argument: | |
318 | outblock the SMTP output block | |
319 | ||
320 | Returns: TRUE if OK, FALSE on error, with errno set | |
321 | */ | |
322 | ||
323 | static BOOL | |
324 | flush_buffer(smtp_outblock *outblock) | |
325 | { | |
326 | int rc; | |
58fc5fb2 | 327 | int n = outblock->ptr - outblock->buffer; |
059ec3d9 | 328 | |
58fc5fb2 | 329 | HDEBUG(D_transport|D_acl) debug_printf("cmd buf flush %d bytes\n", n); |
059ec3d9 | 330 | #ifdef SUPPORT_TLS |
817d9f57 | 331 | if (tls_out.active == outblock->sock) |
58fc5fb2 | 332 | rc = tls_write(FALSE, outblock->buffer, n); |
059ec3d9 PH |
333 | else |
334 | #endif | |
58fc5fb2 | 335 | rc = send(outblock->sock, outblock->buffer, n, 0); |
059ec3d9 | 336 | |
059ec3d9 PH |
337 | if (rc <= 0) |
338 | { | |
339 | HDEBUG(D_transport|D_acl) debug_printf("send failed: %s\n", strerror(errno)); | |
340 | return FALSE; | |
341 | } | |
342 | ||
343 | outblock->ptr = outblock->buffer; | |
344 | outblock->cmd_count = 0; | |
345 | return TRUE; | |
346 | } | |
347 | ||
348 | ||
349 | ||
350 | /************************************************* | |
351 | * Write SMTP command * | |
352 | *************************************************/ | |
353 | ||
354 | /* The formatted command is left in big_buffer so that it can be reflected in | |
355 | any error message. | |
356 | ||
357 | Arguments: | |
358 | outblock contains buffer for pipelining, and socket | |
359 | noflush if TRUE, save the command in the output buffer, for pipelining | |
360 | format a format, starting with one of | |
361 | of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT. | |
6d5c916c | 362 | If NULL, flush pipeline buffer only. |
059ec3d9 PH |
363 | ... data for the format |
364 | ||
365 | Returns: 0 if command added to pipelining buffer, with nothing transmitted | |
366 | +n if n commands transmitted (may still have buffered the new one) | |
367 | -1 on error, with errno set | |
368 | */ | |
369 | ||
370 | int | |
1ba28e2b | 371 | smtp_write_command(smtp_outblock *outblock, BOOL noflush, const char *format, ...) |
059ec3d9 PH |
372 | { |
373 | int count; | |
374 | int rc = 0; | |
375 | va_list ap; | |
376 | ||
6d5c916c | 377 | if (format) |
059ec3d9 | 378 | { |
6d5c916c JH |
379 | va_start(ap, format); |
380 | if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) | |
381 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " | |
382 | "SMTP"); | |
383 | va_end(ap); | |
384 | count = Ustrlen(big_buffer); | |
385 | ||
386 | if (count > outblock->buffersize) | |
387 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " | |
388 | "SMTP"); | |
389 | ||
390 | if (count > outblock->buffersize - (outblock->ptr - outblock->buffer)) | |
391 | { | |
392 | rc = outblock->cmd_count; /* flush resets */ | |
393 | if (!flush_buffer(outblock)) return -1; | |
394 | } | |
059ec3d9 | 395 | |
6d5c916c JH |
396 | Ustrncpy(CS outblock->ptr, big_buffer, count); |
397 | outblock->ptr += count; | |
398 | outblock->cmd_count++; | |
399 | count -= 2; | |
400 | big_buffer[count] = 0; /* remove \r\n for error message */ | |
059ec3d9 | 401 | |
6d5c916c JH |
402 | /* We want to hide the actual data sent in AUTH transactions from reflections |
403 | and logs. While authenticating, a flag is set in the outblock to enable this. | |
404 | The AUTH command itself gets any data flattened. Other lines are flattened | |
405 | completely. */ | |
059ec3d9 | 406 | |
6d5c916c | 407 | if (outblock->authenticating) |
059ec3d9 | 408 | { |
6d5c916c JH |
409 | uschar *p = big_buffer; |
410 | if (Ustrncmp(big_buffer, "AUTH ", 5) == 0) | |
411 | { | |
412 | p += 5; | |
413 | while (isspace(*p)) p++; | |
414 | while (!isspace(*p)) p++; | |
415 | while (isspace(*p)) p++; | |
416 | } | |
417 | while (*p != 0) *p++ = '*'; | |
059ec3d9 | 418 | } |
059ec3d9 | 419 | |
6d5c916c JH |
420 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> %s\n", big_buffer); |
421 | } | |
059ec3d9 PH |
422 | |
423 | if (!noflush) | |
424 | { | |
425 | rc += outblock->cmd_count; /* flush resets */ | |
426 | if (!flush_buffer(outblock)) return -1; | |
427 | } | |
428 | ||
429 | return rc; | |
430 | } | |
431 | ||
432 | ||
433 | ||
434 | /************************************************* | |
435 | * Read one line of SMTP response * | |
436 | *************************************************/ | |
437 | ||
438 | /* This function reads one line of SMTP response from the server host. This may | |
439 | not be a complete response - it could be just part of a multiline response. We | |
440 | have to use a buffer for incoming packets, because when pipelining or using | |
441 | LMTP, there may well be more than one response in a single packet. This | |
442 | function is called only from the one that follows. | |
443 | ||
444 | Arguments: | |
445 | inblock the SMTP input block (contains holding buffer, socket, etc.) | |
446 | buffer where to put the line | |
447 | size space available for the line | |
448 | timeout the timeout to use when reading a packet | |
449 | ||
450 | Returns: length of a line that has been put in the buffer | |
451 | -1 otherwise, with errno set | |
452 | */ | |
453 | ||
454 | static int | |
455 | read_response_line(smtp_inblock *inblock, uschar *buffer, int size, int timeout) | |
456 | { | |
457 | uschar *p = buffer; | |
458 | uschar *ptr = inblock->ptr; | |
459 | uschar *ptrend = inblock->ptrend; | |
460 | int sock = inblock->sock; | |
461 | ||
462 | /* Loop for reading multiple packets or reading another packet after emptying | |
463 | a previously-read one. */ | |
464 | ||
465 | for (;;) | |
466 | { | |
467 | int rc; | |
468 | ||
469 | /* If there is data in the input buffer left over from last time, copy | |
470 | characters from it until the end of a line, at which point we can return, | |
471 | having removed any whitespace (which will include CR) at the end of the line. | |
472 | The rules for SMTP say that lines end in CRLF, but there are have been cases | |
473 | of hosts using just LF, and other MTAs are reported to handle this, so we | |
474 | just look for LF. If we run out of characters before the end of a line, | |
475 | carry on to read the next incoming packet. */ | |
476 | ||
477 | while (ptr < ptrend) | |
478 | { | |
479 | int c = *ptr++; | |
480 | if (c == '\n') | |
481 | { | |
482 | while (p > buffer && isspace(p[-1])) p--; | |
483 | *p = 0; | |
484 | inblock->ptr = ptr; | |
485 | return p - buffer; | |
486 | } | |
487 | *p++ = c; | |
488 | if (--size < 4) | |
489 | { | |
490 | *p = 0; /* Leave malformed line for error message */ | |
491 | errno = ERRNO_SMTPFORMAT; | |
492 | return -1; | |
493 | } | |
494 | } | |
495 | ||
496 | /* Need to read a new input packet. */ | |
497 | ||
498 | rc = ip_recv(sock, inblock->buffer, inblock->buffersize, timeout); | |
499 | if (rc <= 0) break; | |
500 | ||
501 | /* Another block of data has been successfully read. Set up the pointers | |
502 | and let the loop continue. */ | |
503 | ||
504 | ptrend = inblock->ptrend = inblock->buffer + rc; | |
505 | ptr = inblock->buffer; | |
506 | DEBUG(D_transport|D_acl) debug_printf("read response data: size=%d\n", rc); | |
507 | } | |
508 | ||
509 | /* Get here if there has been some kind of recv() error; errno is set, but we | |
510 | ensure that the result buffer is empty before returning. */ | |
511 | ||
512 | *buffer = 0; | |
513 | return -1; | |
514 | } | |
515 | ||
516 | ||
517 | ||
518 | ||
519 | ||
520 | /************************************************* | |
521 | * Read SMTP response * | |
522 | *************************************************/ | |
523 | ||
524 | /* This function reads an SMTP response with a timeout, and returns the | |
525 | response in the given buffer, as a string. A multiline response will contain | |
526 | newline characters between the lines. The function also analyzes the first | |
527 | digit of the reply code and returns FALSE if it is not acceptable. FALSE is | |
528 | also returned after a reading error. In this case buffer[0] will be zero, and | |
529 | the error code will be in errno. | |
530 | ||
531 | Arguments: | |
532 | inblock the SMTP input block (contains holding buffer, socket, etc.) | |
533 | buffer where to put the response | |
534 | size the size of the buffer | |
535 | okdigit the expected first digit of the response | |
536 | timeout the timeout to use | |
537 | ||
538 | Returns: TRUE if a valid, non-error response was received; else FALSE | |
539 | */ | |
540 | ||
541 | BOOL | |
542 | smtp_read_response(smtp_inblock *inblock, uschar *buffer, int size, int okdigit, | |
543 | int timeout) | |
544 | { | |
545 | uschar *ptr = buffer; | |
546 | int count; | |
547 | ||
548 | errno = 0; /* Ensure errno starts out zero */ | |
549 | ||
550 | /* This is a loop to read and concatentate the lines that make up a multi-line | |
551 | response. */ | |
552 | ||
553 | for (;;) | |
554 | { | |
555 | if ((count = read_response_line(inblock, ptr, size, timeout)) < 0) | |
556 | return FALSE; | |
557 | ||
558 | HDEBUG(D_transport|D_acl|D_v) | |
559 | debug_printf(" %s %s\n", (ptr == buffer)? "SMTP<<" : " ", ptr); | |
560 | ||
561 | /* Check the format of the response: it must start with three digits; if | |
562 | these are followed by a space or end of line, the response is complete. If | |
563 | they are followed by '-' this is a multi-line response and we must look for | |
564 | another line until the final line is reached. The only use made of multi-line | |
565 | responses is to pass them back as error messages. We therefore just | |
566 | concatenate them all within the buffer, which should be large enough to | |
567 | accept any reasonable number of lines. */ | |
568 | ||
569 | if (count < 3 || | |
570 | !isdigit(ptr[0]) || | |
571 | !isdigit(ptr[1]) || | |
572 | !isdigit(ptr[2]) || | |
573 | (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0)) | |
574 | { | |
575 | errno = ERRNO_SMTPFORMAT; /* format error */ | |
576 | return FALSE; | |
577 | } | |
578 | ||
579 | /* If the line we have just read is a terminal line, line, we are done. | |
580 | Otherwise more data has to be read. */ | |
581 | ||
582 | if (ptr[3] != '-') break; | |
583 | ||
584 | /* Move the reading pointer upwards in the buffer and insert \n between the | |
585 | components of a multiline response. Space is left for this by read_response_ | |
586 | line(). */ | |
587 | ||
588 | ptr += count; | |
589 | *ptr++ = '\n'; | |
590 | size -= count + 1; | |
591 | } | |
592 | ||
593 | /* Return a value that depends on the SMTP return code. On some systems a | |
594 | non-zero value of errno has been seen at this point, so ensure it is zero, | |
595 | because the caller of this function looks at errno when FALSE is returned, to | |
596 | distinguish between an unexpected return code and other errors such as | |
597 | timeouts, lost connections, etc. */ | |
598 | ||
599 | errno = 0; | |
600 | return buffer[0] == okdigit; | |
601 | } | |
602 | ||
603 | /* End of smtp_out.c */ | |
7eb6c37c JH |
604 | /* vi: aw ai sw=2 |
605 | */ |