Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
7eb6c37c | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
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) | |
29 | changed if not NULL, set TRUE if expansion actually changed istring | |
30 | interface point this to the interface | |
31 | msg to add to any error message | |
32 | ||
33 | Returns: TRUE on success, FALSE on failure, with error message | |
34 | set in addr and transport_return set to PANIC | |
35 | */ | |
36 | ||
37 | BOOL | |
38 | smtp_get_interface(uschar *istring, int host_af, address_item *addr, | |
39 | BOOL *changed, uschar **interface, uschar *msg) | |
40 | { | |
55414b25 | 41 | const uschar * expint; |
059ec3d9 PH |
42 | uschar *iface; |
43 | int sep = 0; | |
44 | ||
45 | if (istring == NULL) return TRUE; | |
46 | ||
47 | expint = expand_string(istring); | |
48 | if (expint == NULL) | |
49 | { | |
50 | if (expand_string_forcedfail) return TRUE; | |
51 | addr->transport_return = PANIC; | |
52 | addr->message = string_sprintf("failed to expand \"interface\" " | |
53 | "option for %s: %s", msg, expand_string_message); | |
54 | return FALSE; | |
55 | } | |
56 | ||
57 | if (changed != NULL) *changed = expint != istring; | |
58 | ||
59 | while (isspace(*expint)) expint++; | |
60 | if (*expint == 0) return TRUE; | |
61 | ||
62 | while ((iface = string_nextinlist(&expint, &sep, big_buffer, | |
63 | big_buffer_size)) != NULL) | |
64 | { | |
65 | if (string_is_ip_address(iface, NULL) == 0) | |
66 | { | |
67 | addr->transport_return = PANIC; | |
68 | addr->message = string_sprintf("\"%s\" is not a valid IP " | |
69 | "address for the \"interface\" option for %s", | |
70 | iface, msg); | |
71 | return FALSE; | |
72 | } | |
73 | ||
74 | if (((Ustrchr(iface, ':') == NULL)? AF_INET:AF_INET6) == host_af) | |
75 | break; | |
76 | } | |
77 | ||
78 | if (iface != NULL) *interface = string_copy(iface); | |
79 | return TRUE; | |
80 | } | |
81 | ||
82 | ||
83 | ||
84 | /************************************************* | |
85 | * Find an outgoing port * | |
86 | *************************************************/ | |
87 | ||
88 | /* This function is called from the smtp transport and also from the callout | |
89 | code in verify.c. Its job is to find a port number. Note that getservbyname() | |
90 | produces the number in network byte order. | |
91 | ||
92 | Arguments: | |
93 | rstring raw (unexpanded) string representation of the port | |
94 | addr the mail address being handled (for setting errors) | |
95 | port stick the port in here | |
96 | msg for adding to error message | |
97 | ||
98 | Returns: TRUE on success, FALSE on failure, with error message set | |
99 | in addr, and transport_return set to PANIC | |
100 | */ | |
101 | ||
102 | BOOL | |
103 | smtp_get_port(uschar *rstring, address_item *addr, int *port, uschar *msg) | |
104 | { | |
105 | uschar *pstring = expand_string(rstring); | |
106 | ||
107 | if (pstring == NULL) | |
108 | { | |
109 | addr->transport_return = PANIC; | |
110 | addr->message = string_sprintf("failed to expand \"%s\" (\"port\" option) " | |
111 | "for %s: %s", rstring, msg, expand_string_message); | |
112 | return FALSE; | |
113 | } | |
114 | ||
115 | if (isdigit(*pstring)) | |
116 | { | |
117 | uschar *end; | |
118 | *port = Ustrtol(pstring, &end, 0); | |
119 | if (end != pstring + Ustrlen(pstring)) | |
120 | { | |
121 | addr->transport_return = PANIC; | |
122 | addr->message = string_sprintf("invalid port number for %s: %s", msg, | |
123 | pstring); | |
124 | return FALSE; | |
125 | } | |
126 | } | |
127 | ||
128 | else | |
129 | { | |
130 | struct servent *smtp_service = getservbyname(CS pstring, "tcp"); | |
131 | if (smtp_service == NULL) | |
132 | { | |
133 | addr->transport_return = PANIC; | |
134 | addr->message = string_sprintf("TCP port \"%s\" is not defined for %s", | |
135 | pstring, msg); | |
136 | return FALSE; | |
137 | } | |
138 | *port = ntohs(smtp_service->s_port); | |
139 | } | |
140 | ||
141 | return TRUE; | |
142 | } | |
143 | ||
144 | ||
145 | ||
146 | ||
059ec3d9 | 147 | int |
7eb6c37c JH |
148 | smtp_sock_connect(host_item * host, int host_af, int port, uschar * interface, |
149 | transport_instance * tb, int timeout) | |
059ec3d9 | 150 | { |
7eb6c37c JH |
151 | smtp_transport_options_block * ob = |
152 | (smtp_transport_options_block *)tb->options_block; | |
153 | const uschar * dscp = ob->dscp; | |
9e4f5962 PP |
154 | int dscp_value; |
155 | int dscp_level; | |
156 | int dscp_option; | |
059ec3d9 | 157 | int sock; |
7eb6c37c JH |
158 | int on = 1; |
159 | int save_errno = 0; | |
059ec3d9 | 160 | |
774ef2d7 | 161 | #ifdef EXPERIMENTAL_EVENT |
7eb6c37c JH |
162 | deliver_host_address = host->address; |
163 | deliver_host_port = port; | |
164 | if (event_raise(tb->event_action, US"tcp:connect", NULL)) return -1; | |
a7538db1 JH |
165 | #endif |
166 | ||
059ec3d9 PH |
167 | if ((sock = ip_socket(SOCK_STREAM, host_af)) < 0) return -1; |
168 | ||
169 | /* Set TCP_NODELAY; Exim does its own buffering. */ | |
170 | ||
171 | setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (uschar *)(&on), sizeof(on)); | |
172 | ||
9e4f5962 PP |
173 | /* Set DSCP value, if we can. For now, if we fail to set the value, we don't |
174 | bomb out, just log it and continue in default traffic class. */ | |
175 | ||
176 | if (dscp && dscp_lookup(dscp, host_af, &dscp_level, &dscp_option, &dscp_value)) | |
177 | { | |
178 | HDEBUG(D_transport|D_acl|D_v) | |
36a3ae5f | 179 | debug_printf("DSCP \"%s\"=%x ", dscp, dscp_value); |
9e4f5962 PP |
180 | if (setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)) < 0) |
181 | HDEBUG(D_transport|D_acl|D_v) | |
182 | debug_printf("failed to set DSCP: %s ", strerror(errno)); | |
183 | /* If the kernel supports IPv4 and IPv6 on an IPv6 socket, we need to set the | |
184 | option for both; ignore failures here */ | |
185 | if (host_af == AF_INET6 && | |
186 | dscp_lookup(dscp, AF_INET, &dscp_level, &dscp_option, &dscp_value)) | |
9e4f5962 | 187 | (void) setsockopt(sock, dscp_level, dscp_option, &dscp_value, sizeof(dscp_value)); |
9e4f5962 PP |
188 | } |
189 | ||
059ec3d9 PH |
190 | /* Bind to a specific interface if requested. Caller must ensure the interface |
191 | is the same type (IPv4 or IPv6) as the outgoing address. */ | |
192 | ||
7eb6c37c | 193 | if (interface && ip_bind(sock, host_af, interface, 0) < 0) |
059ec3d9 PH |
194 | { |
195 | save_errno = errno; | |
196 | HDEBUG(D_transport|D_acl|D_v) | |
197 | debug_printf("unable to bind outgoing SMTP call to %s: %s", interface, | |
198 | strerror(errno)); | |
199 | } | |
200 | ||
201 | /* Connect to the remote host, and add keepalive to the socket before returning | |
202 | it, if requested. */ | |
203 | ||
204 | else if (ip_connect(sock, host_af, host->address, port, timeout) < 0) | |
205 | save_errno = errno; | |
206 | ||
207 | /* Either bind() or connect() failed */ | |
208 | ||
209 | if (save_errno != 0) | |
210 | { | |
8e669ac1 | 211 | HDEBUG(D_transport|D_acl|D_v) |
4deaf07d PH |
212 | { |
213 | debug_printf("failed: %s", CUstrerror(save_errno)); | |
8e669ac1 | 214 | if (save_errno == ETIMEDOUT) |
4deaf07d | 215 | debug_printf(" (timeout=%s)", readconf_printtime(timeout)); |
8e669ac1 PH |
216 | debug_printf("\n"); |
217 | } | |
f1e894f3 | 218 | (void)close(sock); |
059ec3d9 PH |
219 | errno = save_errno; |
220 | return -1; | |
221 | } | |
222 | ||
223 | /* Both bind() and connect() succeeded */ | |
224 | ||
225 | else | |
226 | { | |
41c7c167 PH |
227 | union sockaddr_46 interface_sock; |
228 | EXIM_SOCKLEN_T size = sizeof(interface_sock); | |
059ec3d9 | 229 | HDEBUG(D_transport|D_acl|D_v) debug_printf("connected\n"); |
41c7c167 PH |
230 | if (getsockname(sock, (struct sockaddr *)(&interface_sock), &size) == 0) |
231 | sending_ip_address = host_ntoa(-1, &interface_sock, NULL, &sending_port); | |
232 | else | |
233 | { | |
234 | log_write(0, LOG_MAIN | ((errno == ECONNRESET)? 0 : LOG_PANIC), | |
235 | "getsockname() failed: %s", strerror(errno)); | |
236 | close(sock); | |
237 | return -1; | |
238 | } | |
7eb6c37c | 239 | if (ob->keepalive) ip_keepalive(sock, host->address, TRUE); |
059ec3d9 PH |
240 | return sock; |
241 | } | |
242 | } | |
243 | ||
7eb6c37c JH |
244 | /************************************************* |
245 | * Connect to remote host * | |
246 | *************************************************/ | |
247 | ||
248 | /* Create a socket, and connect it to a remote host. IPv6 addresses are | |
249 | detected by checking for a colon in the address. AF_INET6 is defined even on | |
250 | non-IPv6 systems, to enable the code to be less messy. However, on such systems | |
251 | host->address will always be an IPv4 address. | |
252 | ||
253 | The port field in the host item is used if it is set (usually router from SRV | |
254 | records or elsewhere). In other cases, the default passed as an argument is | |
255 | used, and the host item is updated with its value. | |
256 | ||
257 | Arguments: | |
258 | host host item containing name and address (and sometimes port) | |
259 | host_af AF_INET or AF_INET6 | |
260 | port default remote port to connect to, in host byte order, for those | |
261 | hosts whose port setting is PORT_NONE | |
262 | interface outgoing interface address or NULL | |
263 | timeout timeout value or 0 | |
264 | tb transport | |
265 | ||
266 | Returns: connected socket number, or -1 with errno set | |
267 | */ | |
268 | ||
269 | int | |
270 | smtp_connect(host_item *host, int host_af, int port, uschar *interface, | |
271 | int timeout, transport_instance * tb) | |
272 | { | |
273 | smtp_transport_options_block * ob = | |
274 | (smtp_transport_options_block *)tb->options_block; | |
275 | ||
276 | if (host->port != PORT_NONE) | |
277 | { | |
278 | HDEBUG(D_transport|D_acl|D_v) | |
279 | debug_printf("Transport port=%d replaced by host-specific port=%d\n", port, | |
280 | host->port); | |
281 | port = host->port; | |
282 | } | |
283 | else host->port = port; /* Set the port actually used */ | |
284 | ||
285 | HDEBUG(D_transport|D_acl|D_v) | |
286 | { | |
287 | uschar * s = US" "; | |
288 | if (interface) s = string_sprintf(" from %s ", interface); | |
289 | #ifdef EXPERIMENTAL_SOCKS | |
290 | if (ob->socks_proxy) s = string_sprintf("%svia proxy ", s); | |
291 | #endif | |
292 | debug_printf("Connecting to %s [%s]:%d%s... ", | |
293 | host->name, host->address, port, s); | |
294 | } | |
295 | ||
296 | /* Create and connect the socket */ | |
297 | ||
298 | #ifdef EXPERIMENTAL_SOCKS | |
299 | if (ob->socks_proxy) | |
300 | return socks_sock_connect(host, host_af, port, interface, tb, timeout); | |
301 | #endif | |
302 | ||
303 | return smtp_sock_connect(host, host_af, port, interface, tb, timeout); | |
304 | } | |
305 | ||
059ec3d9 PH |
306 | |
307 | /************************************************* | |
308 | * Flush outgoing command buffer * | |
309 | *************************************************/ | |
310 | ||
311 | /* This function is called only from smtp_write_command() below. It flushes | |
312 | the buffer of outgoing commands. There is more than one in the buffer only when | |
313 | pipelining. | |
314 | ||
315 | Argument: | |
316 | outblock the SMTP output block | |
317 | ||
318 | Returns: TRUE if OK, FALSE on error, with errno set | |
319 | */ | |
320 | ||
321 | static BOOL | |
322 | flush_buffer(smtp_outblock *outblock) | |
323 | { | |
324 | int rc; | |
325 | ||
326 | #ifdef SUPPORT_TLS | |
817d9f57 JH |
327 | if (tls_out.active == outblock->sock) |
328 | rc = tls_write(FALSE, outblock->buffer, outblock->ptr - outblock->buffer); | |
059ec3d9 PH |
329 | else |
330 | #endif | |
331 | ||
332 | rc = send(outblock->sock, outblock->buffer, outblock->ptr - outblock->buffer, 0); | |
333 | if (rc <= 0) | |
334 | { | |
335 | HDEBUG(D_transport|D_acl) debug_printf("send failed: %s\n", strerror(errno)); | |
336 | return FALSE; | |
337 | } | |
338 | ||
339 | outblock->ptr = outblock->buffer; | |
340 | outblock->cmd_count = 0; | |
341 | return TRUE; | |
342 | } | |
343 | ||
344 | ||
345 | ||
346 | /************************************************* | |
347 | * Write SMTP command * | |
348 | *************************************************/ | |
349 | ||
350 | /* The formatted command is left in big_buffer so that it can be reflected in | |
351 | any error message. | |
352 | ||
353 | Arguments: | |
354 | outblock contains buffer for pipelining, and socket | |
355 | noflush if TRUE, save the command in the output buffer, for pipelining | |
356 | format a format, starting with one of | |
357 | of HELO, MAIL FROM, RCPT TO, DATA, ".", or QUIT. | |
358 | ... data for the format | |
359 | ||
360 | Returns: 0 if command added to pipelining buffer, with nothing transmitted | |
361 | +n if n commands transmitted (may still have buffered the new one) | |
362 | -1 on error, with errno set | |
363 | */ | |
364 | ||
365 | int | |
1ba28e2b | 366 | smtp_write_command(smtp_outblock *outblock, BOOL noflush, const char *format, ...) |
059ec3d9 PH |
367 | { |
368 | int count; | |
369 | int rc = 0; | |
370 | va_list ap; | |
371 | ||
372 | va_start(ap, format); | |
373 | if (!string_vformat(big_buffer, big_buffer_size, CS format, ap)) | |
374 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " | |
375 | "SMTP"); | |
376 | va_end(ap); | |
377 | count = Ustrlen(big_buffer); | |
378 | ||
98470202 JH |
379 | if (count > outblock->buffersize) |
380 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "overlong write_command in outgoing " | |
381 | "SMTP"); | |
382 | ||
059ec3d9 PH |
383 | if (count > outblock->buffersize - (outblock->ptr - outblock->buffer)) |
384 | { | |
385 | rc = outblock->cmd_count; /* flush resets */ | |
386 | if (!flush_buffer(outblock)) return -1; | |
387 | } | |
388 | ||
389 | Ustrncpy(CS outblock->ptr, big_buffer, count); | |
390 | outblock->ptr += count; | |
391 | outblock->cmd_count++; | |
392 | count -= 2; | |
393 | big_buffer[count] = 0; /* remove \r\n for error message */ | |
394 | ||
395 | /* We want to hide the actual data sent in AUTH transactions from reflections | |
396 | and logs. While authenticating, a flag is set in the outblock to enable this. | |
397 | The AUTH command itself gets any data flattened. Other lines are flattened | |
398 | completely. */ | |
399 | ||
400 | if (outblock->authenticating) | |
401 | { | |
402 | uschar *p = big_buffer; | |
403 | if (Ustrncmp(big_buffer, "AUTH ", 5) == 0) | |
404 | { | |
405 | p += 5; | |
406 | while (isspace(*p)) p++; | |
407 | while (!isspace(*p)) p++; | |
408 | while (isspace(*p)) p++; | |
409 | } | |
410 | while (*p != 0) *p++ = '*'; | |
411 | } | |
412 | ||
413 | HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP>> %s\n", big_buffer); | |
414 | ||
415 | if (!noflush) | |
416 | { | |
417 | rc += outblock->cmd_count; /* flush resets */ | |
418 | if (!flush_buffer(outblock)) return -1; | |
419 | } | |
420 | ||
421 | return rc; | |
422 | } | |
423 | ||
424 | ||
425 | ||
426 | /************************************************* | |
427 | * Read one line of SMTP response * | |
428 | *************************************************/ | |
429 | ||
430 | /* This function reads one line of SMTP response from the server host. This may | |
431 | not be a complete response - it could be just part of a multiline response. We | |
432 | have to use a buffer for incoming packets, because when pipelining or using | |
433 | LMTP, there may well be more than one response in a single packet. This | |
434 | function is called only from the one that follows. | |
435 | ||
436 | Arguments: | |
437 | inblock the SMTP input block (contains holding buffer, socket, etc.) | |
438 | buffer where to put the line | |
439 | size space available for the line | |
440 | timeout the timeout to use when reading a packet | |
441 | ||
442 | Returns: length of a line that has been put in the buffer | |
443 | -1 otherwise, with errno set | |
444 | */ | |
445 | ||
446 | static int | |
447 | read_response_line(smtp_inblock *inblock, uschar *buffer, int size, int timeout) | |
448 | { | |
449 | uschar *p = buffer; | |
450 | uschar *ptr = inblock->ptr; | |
451 | uschar *ptrend = inblock->ptrend; | |
452 | int sock = inblock->sock; | |
453 | ||
454 | /* Loop for reading multiple packets or reading another packet after emptying | |
455 | a previously-read one. */ | |
456 | ||
457 | for (;;) | |
458 | { | |
459 | int rc; | |
460 | ||
461 | /* If there is data in the input buffer left over from last time, copy | |
462 | characters from it until the end of a line, at which point we can return, | |
463 | having removed any whitespace (which will include CR) at the end of the line. | |
464 | The rules for SMTP say that lines end in CRLF, but there are have been cases | |
465 | of hosts using just LF, and other MTAs are reported to handle this, so we | |
466 | just look for LF. If we run out of characters before the end of a line, | |
467 | carry on to read the next incoming packet. */ | |
468 | ||
469 | while (ptr < ptrend) | |
470 | { | |
471 | int c = *ptr++; | |
472 | if (c == '\n') | |
473 | { | |
474 | while (p > buffer && isspace(p[-1])) p--; | |
475 | *p = 0; | |
476 | inblock->ptr = ptr; | |
477 | return p - buffer; | |
478 | } | |
479 | *p++ = c; | |
480 | if (--size < 4) | |
481 | { | |
482 | *p = 0; /* Leave malformed line for error message */ | |
483 | errno = ERRNO_SMTPFORMAT; | |
484 | return -1; | |
485 | } | |
486 | } | |
487 | ||
488 | /* Need to read a new input packet. */ | |
489 | ||
490 | rc = ip_recv(sock, inblock->buffer, inblock->buffersize, timeout); | |
491 | if (rc <= 0) break; | |
492 | ||
493 | /* Another block of data has been successfully read. Set up the pointers | |
494 | and let the loop continue. */ | |
495 | ||
496 | ptrend = inblock->ptrend = inblock->buffer + rc; | |
497 | ptr = inblock->buffer; | |
498 | DEBUG(D_transport|D_acl) debug_printf("read response data: size=%d\n", rc); | |
499 | } | |
500 | ||
501 | /* Get here if there has been some kind of recv() error; errno is set, but we | |
502 | ensure that the result buffer is empty before returning. */ | |
503 | ||
504 | *buffer = 0; | |
505 | return -1; | |
506 | } | |
507 | ||
508 | ||
509 | ||
510 | ||
511 | ||
512 | /************************************************* | |
513 | * Read SMTP response * | |
514 | *************************************************/ | |
515 | ||
516 | /* This function reads an SMTP response with a timeout, and returns the | |
517 | response in the given buffer, as a string. A multiline response will contain | |
518 | newline characters between the lines. The function also analyzes the first | |
519 | digit of the reply code and returns FALSE if it is not acceptable. FALSE is | |
520 | also returned after a reading error. In this case buffer[0] will be zero, and | |
521 | the error code will be in errno. | |
522 | ||
523 | Arguments: | |
524 | inblock the SMTP input block (contains holding buffer, socket, etc.) | |
525 | buffer where to put the response | |
526 | size the size of the buffer | |
527 | okdigit the expected first digit of the response | |
528 | timeout the timeout to use | |
529 | ||
530 | Returns: TRUE if a valid, non-error response was received; else FALSE | |
531 | */ | |
532 | ||
533 | BOOL | |
534 | smtp_read_response(smtp_inblock *inblock, uschar *buffer, int size, int okdigit, | |
535 | int timeout) | |
536 | { | |
537 | uschar *ptr = buffer; | |
538 | int count; | |
539 | ||
540 | errno = 0; /* Ensure errno starts out zero */ | |
541 | ||
542 | /* This is a loop to read and concatentate the lines that make up a multi-line | |
543 | response. */ | |
544 | ||
545 | for (;;) | |
546 | { | |
547 | if ((count = read_response_line(inblock, ptr, size, timeout)) < 0) | |
548 | return FALSE; | |
549 | ||
550 | HDEBUG(D_transport|D_acl|D_v) | |
551 | debug_printf(" %s %s\n", (ptr == buffer)? "SMTP<<" : " ", ptr); | |
552 | ||
553 | /* Check the format of the response: it must start with three digits; if | |
554 | these are followed by a space or end of line, the response is complete. If | |
555 | they are followed by '-' this is a multi-line response and we must look for | |
556 | another line until the final line is reached. The only use made of multi-line | |
557 | responses is to pass them back as error messages. We therefore just | |
558 | concatenate them all within the buffer, which should be large enough to | |
559 | accept any reasonable number of lines. */ | |
560 | ||
561 | if (count < 3 || | |
562 | !isdigit(ptr[0]) || | |
563 | !isdigit(ptr[1]) || | |
564 | !isdigit(ptr[2]) || | |
565 | (ptr[3] != '-' && ptr[3] != ' ' && ptr[3] != 0)) | |
566 | { | |
567 | errno = ERRNO_SMTPFORMAT; /* format error */ | |
568 | return FALSE; | |
569 | } | |
570 | ||
571 | /* If the line we have just read is a terminal line, line, we are done. | |
572 | Otherwise more data has to be read. */ | |
573 | ||
574 | if (ptr[3] != '-') break; | |
575 | ||
576 | /* Move the reading pointer upwards in the buffer and insert \n between the | |
577 | components of a multiline response. Space is left for this by read_response_ | |
578 | line(). */ | |
579 | ||
580 | ptr += count; | |
581 | *ptr++ = '\n'; | |
582 | size -= count + 1; | |
583 | } | |
584 | ||
585 | /* Return a value that depends on the SMTP return code. On some systems a | |
586 | non-zero value of errno has been seen at this point, so ensure it is zero, | |
587 | because the caller of this function looks at errno when FALSE is returned, to | |
588 | distinguish between an unexpected return code and other errors such as | |
589 | timeouts, lost connections, etc. */ | |
590 | ||
591 | errno = 0; | |
592 | return buffer[0] == okdigit; | |
593 | } | |
594 | ||
595 | /* End of smtp_out.c */ | |
7eb6c37c JH |
596 | /* vi: aw ai sw=2 |
597 | */ |