-/* $Cambridge: exim/src/src/receive.c,v 1.26 2006/02/14 15:11:43 ph10 Exp $ */
+/* $Cambridge: exim/src/src/receive.c,v 1.37 2007/04/16 10:31:58 ph10 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2007 */
/* See the file NOTICE for conditions of use and distribution. */
/* Code for receiving a message and setting up spool files. */
* Add header lines set up by ACL *
*************************************************/
-/* This function is called to add the header lines that were set up by "warn"
-statements in an ACL onto the list of headers in memory. It is done in two
-stages like this, because when the ACL for RCPT is running, the other headers
-have not yet been received. This function is called twice; once just before
-running the DATA ACL, and once after. This is so that header lines added by
-MAIL or RCPT are visible to the DATA ACL.
+/* This function is called to add the header lines that were set up by
+statements in an ACL to the list of headers in memory. It is done in two stages
+like this, because when the ACL for RCPT is running, the other headers have not
+yet been received. This function is called twice; once just before running the
+DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
+are visible to the DATA ACL.
Originally these header lines were added at the end. Now there is support for
three different places: top, bottom, and after the Received: header(s). There
header_line *h, *next;
header_line *last_received = NULL;
-if (acl_warn_headers == NULL) return;
+if (acl_added_headers == NULL) return;
DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
-for (h = acl_warn_headers; h != NULL; h = next)
+for (h = acl_added_headers; h != NULL; h = next)
{
next = h->next;
DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
}
-acl_warn_headers = NULL;
+acl_added_headers = NULL;
DEBUG(D_receive|D_acl) debug_printf(">>\n");
}
/* check if it is a MIME message */
my_headerlist = header_list;
-while (my_headerlist != NULL) {
+while (my_headerlist != NULL)
+ {
/* skip deleted headers */
- if (my_headerlist->type == '*') {
+ if (my_headerlist->type == '*')
+ {
my_headerlist = my_headerlist->next;
continue;
- };
- if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0) {
+ }
+ if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
+ {
DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
goto DO_MIME_ACL;
- };
+ }
my_headerlist = my_headerlist->next;
-};
+ }
DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
return TRUE;
"acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
Uunlink(spool_name);
unspool_mbox();
- smtp_respond(451, TRUE, US"temporary local problem");
+ smtp_respond(US"451", 3, TRUE, US"temporary local problem");
message_id[0] = 0; /* Indicate no message accepted */
*smtp_reply_ptr = US""; /* Indicate reply already sent */
return FALSE; /* Indicate skip to end of receive function */
rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
(void)fclose(mbox_file);
-if (Ustrlen(rfc822_file_path) > 0) {
+if (Ustrlen(rfc822_file_path) > 0)
+ {
mime_part_count = mime_part_count_buffer;
- if (unlink(CS rfc822_file_path) == -1) {
+ if (unlink(CS rfc822_file_path) == -1)
+ {
log_write(0, LOG_PANIC,
"acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
goto END_MIME_ACL;
- };
-};
+ }
+ }
/* check if we must check any message/rfc822 attachments */
-if (rc == OK) {
+if (rc == OK)
+ {
uschar temp_path[1024];
int n;
struct dirent *entry;
(void)string_format(temp_path, 1024, "%s/scan/%s", spool_directory,
message_id);
- tempdir = opendir(CS temp_path);
- n = 0;
- do {
- entry = readdir(tempdir);
- if (entry == NULL) break;
- if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0) {
+ tempdir = opendir(CS temp_path);
+ n = 0;
+ do
+ {
+ entry = readdir(tempdir);
+ if (entry == NULL) break;
+ if (strncmpic(US entry->d_name,US"__rfc822_",9) == 0)
+ {
(void)string_format(rfc822_file_path, 2048,"%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
- debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
- break;
- };
- } while (1);
- closedir(tempdir);
+ debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path);
+ break;
+ }
+ } while (1);
+ closedir(tempdir);
- if (entry != NULL) {
+ if (entry != NULL)
+ {
mbox_file = Ufopen(rfc822_file_path,"rb");
- if (mbox_file == NULL) {
+ if (mbox_file == NULL)
+ {
log_write(0, LOG_PANIC,
"acl_smtp_mime: can't open RFC822 spool file, skipping.");
unlink(CS rfc822_file_path);
goto END_MIME_ACL;
- };
+ }
/* set RFC822 expansion variable */
mime_is_rfc822 = 1;
mime_part_count_buffer = mime_part_count;
goto MIME_ACL_CHECK;
- };
-};
+ }
+ }
END_MIME_ACL:
add_acl_headers(US"MIME");
*smtp_reply_ptr = US""; /* Indicate reply already sent */
message_id[0] = 0; /* Indicate no message accepted */
return FALSE; /* Cause skip to end of receive function */
- };
+ }
return TRUE;
}
uschar *errmsg, *s;
struct stat statbuf;
-/* Final message to give to SMTP caller */
+/* Final message to give to SMTP caller, and messages from ACLs */
uschar *smtp_reply = NULL;
+uschar *user_msg, *log_msg;
/* Working header pointers */
recipients_count = recipients_list_max = 0;
}
- parse_allow_group = TRUE; /* Allow address group syntax */
-
/* Now scan the headers */
for (h = header_list->next; h != NULL; h = h->next)
uschar *s = Ustrchr(h->text, ':') + 1;
while (isspace(*s)) s++;
+ parse_allow_group = TRUE; /* Allow address group syntax */
+
while (*s != 0)
{
uschar *ss = parse_find_address_end(s, FALSE);
s = ss + (*ss? 1:0);
while (isspace(*s)) s++;
- }
+ } /* Next address */
+
+ parse_allow_group = FALSE; /* Reset group syntax flags */
+ parse_found_group = FALSE;
/* If this was the bcc: header, mark it "old", which means it
will be kept on the spool, but not transmitted as part of the
} /* For appropriate header line */
} /* For each header line */
- parse_allow_group = FALSE; /* Reset group syntax flags */
- parse_found_group = FALSE;
}
/* Now build the unique message id. This has changed several times over the
anything until the terminating dot line is sent. */
if (fflush(data_file) == EOF || ferror(data_file) ||
- fsync(fileno(data_file)) < 0 || (receive_ferror)())
+ EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
{
uschar *msg_errno = US strerror(errno);
BOOL input_error = (receive_ferror)() != 0;
*/
deliver_datafile = data_fd;
+user_msg = NULL;
+
+enable_dollar_recipients = TRUE;
if (recipients_count == 0)
{
}
else
{
- enable_dollar_recipients = TRUE;
-
/* Handle interactive SMTP messages */
if (smtp_input && !smtp_batched_input)
if (acl_smtp_data != NULL && recipients_count > 0)
{
- uschar *user_msg, *log_msg;
rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
add_acl_headers(US"DATA");
if (rc == DISCARD)
#ifdef WITH_CONTENT_SCAN
unspool_mbox();
#endif
- log_write(0, LOG_MAIN|LOG_REJECT, "F=<%s> rejected by non-SMTP ACL: %s",
- sender_address, log_msg);
+ /* The ACL can specify where rejections are to be logged, possibly
+ nowhere. The default is main and reject logs. */
+
+ if (log_reject_target != 0)
+ log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
+ sender_address, log_msg);
+
if (user_msg == NULL) user_msg = US"local configuration problem";
if (smtp_batched_input)
{
if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
if (queue_only_policy) queued_by = US"ACL";
-
- enable_dollar_recipients = FALSE;
}
#ifdef WITH_CONTENT_SCAN
alarm(0);
os_non_restarting_signal(SIGALRM, sigalrm_handler);
+enable_dollar_recipients = FALSE;
+
store_pool = POOL_MAIN; /* In case changed */
DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
local_scan_data);
if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
{
- if (!deliver_freeze) /* ACL might have already frozen */
+ if (!deliver_freeze) /* ACL might have already frozen */
{
deliver_freeze = TRUE;
deliver_frozen_at = time(NULL);
{
uschar *istemp = US"";
uschar *s = NULL;
+ uschar *smtp_code;
int size = 0;
int sptr = 0;
- int code;
errmsg = local_scan_data;
/* Fall through */
case LOCAL_SCAN_REJECT:
- code = 550;
+ smtp_code = US"550";
if (errmsg == NULL) errmsg = US"Administrative prohibition";
break;
case LOCAL_SCAN_TEMPREJECT:
TEMPREJECT:
- code = 451;
+ smtp_code = US"451";
if (errmsg == NULL) errmsg = US"Temporary local problem";
istemp = US"temporarily ";
break;
{
if (!smtp_batched_input)
{
- smtp_respond(code, TRUE, errmsg);
+ smtp_respond(smtp_code, 3, TRUE, errmsg);
message_id[0] = 0; /* Indicate no message accepted */
smtp_reply = US""; /* Indicate reply already sent */
goto TIDYUP; /* Skip to end of function */
}
else
{
- moan_smtp_batch(NULL, "%d %s", code, errmsg);
+ moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
/* Does not return */
}
}
s[sptr] = 0;
-/* While writing to the log, set a flag to cause a call to receive_bomb_out()
-if the log cannot be opened. */
-
-receive_call_bombout = TRUE;
-log_write(0, LOG_MAIN |
- (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
- (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
- "%s", s);
-receive_call_bombout = FALSE;
-
-/* Log any control actions taken by an ACL or local_scan(). */
-
-if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
-if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
- "no immediate delivery: queued by %s", queued_by);
-
/* Create a message log file if message logs are being used and this message is
not blackholed. Write the reception stuff to it. We used to leave message log
creation until the first delivery, but this has proved confusing for somep
}
}
+/* Everything has now been done for a successful message except logging its
+arrival, and outputting an SMTP response. While writing to the log, set a flag
+to cause a call to receive_bomb_out() if the log cannot be opened. */
+
+receive_call_bombout = TRUE;
+
+/* Before sending an SMTP response in a TCP/IP session, we check to see if the
+connection has gone away. This can only be done if there is no unconsumed input
+waiting in the local input buffer. We can test for this by calling
+receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
+input to be sent following the final dot, so the presence of following input is
+not an error.
+
+If the connection is still present, but there is no unread input for the
+socket, the result of a select() call will be zero. If, however, the connection
+has gone away, or if there is pending input, the result of select() will be
+non-zero. The two cases can be distinguished by trying to read the next input
+character. If we succeed, we can unread it so that it remains in the local
+buffer for handling later. If not, the connection has been lost.
+
+Of course, since TCP/IP is asynchronous, there is always a chance that the
+connection will vanish between the time of this test and the sending of the
+response, but the chance of this happening should be small. */
+
+if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
+ !receive_smtp_buffered())
+ {
+ struct timeval tv;
+ fd_set select_check;
+ FD_ZERO(&select_check);
+ FD_SET(fileno(smtp_in), &select_check);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+
+ if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
+ {
+ int c = (RECEIVE_GETC)();
+ if (c != EOF) (RECEIVE_UNGETC)(c); else
+ {
+ uschar *msg = US"SMTP connection lost after final dot";
+ smtp_reply = US""; /* No attempt to send a response */
+ smtp_yield = FALSE; /* Nothing more on this connection */
+
+ /* Re-use the log line workspace */
+
+ sptr = 0;
+ s = string_cat(s, &size, &sptr, msg, Ustrlen(msg));
+ s = add_host_info_for_log(s, &size, &sptr);
+ s[sptr] = 0;
+ log_write(0, LOG_MAIN, "%s", s);
+
+ /* Delete the files for this aborted message. */
+
+ sprintf(CS spool_name, "%s/input/%s/%s-D", spool_directory,
+ message_subdir, message_id);
+ Uunlink(spool_name);
+
+ sprintf(CS spool_name, "%s/input/%s/%s-H", spool_directory,
+ message_subdir, message_id);
+ Uunlink(spool_name);
+
+ sprintf(CS spool_name, "%s/msglog/%s/%s", spool_directory,
+ message_subdir, message_id);
+ Uunlink(spool_name);
+
+ goto TIDYUP;
+ }
+ }
+ }
+
+/* The connection has not gone away; we really are going to take responsibility
+for this message. */
+
+log_write(0, LOG_MAIN |
+ (((log_extra_selector & LX_received_recipients) != 0)? LOG_RECIPIENTS : 0) |
+ (((log_extra_selector & LX_received_sender) != 0)? LOG_SENDER : 0),
+ "%s", s);
+receive_call_bombout = FALSE;
+
+/* Log any control actions taken by an ACL or local_scan(). */
+
+if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
+if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
+ "no immediate delivery: queued by %s", queued_by);
+
store_reset(s); /* The store for the main log message can be reused */
/* If the message is frozen, and freeze_tell is set, do the telling. */
/* Either a message has been successfully received and written to the two spool
files, or an error in writing the spool has occurred for an SMTP message, or
-an SMTP message has been rejected because of a bad sender. (For a non-SMTP
-message we will have already given up because there's no point in carrying on!)
-In either event, we must now close (and thereby unlock) the data file. In the
+an SMTP message has been rejected for policy reasons. (For a non-SMTP message
+we will have already given up because there's no point in carrying on!) In
+either event, we must now close (and thereby unlock) the data file. In the
successful case, this leaves the message on the spool, ready for delivery. In
the error case, the spool file will be deleted. Then tidy up store, interact
with an SMTP call if necessary, and return.
yield = smtp_yield;
/* Handle interactive SMTP callers. After several kinds of error, smtp_reply
- is set to the response. However, after an ACL error or local_scan() error,
- the response has already been sent, and smtp_reply is an empty string to
- indicate this. */
+ is set to the response that should be sent. When it is NULL, we generate
+ default responses. After an ACL error or local_scan() error, the response has
+ already been sent, and smtp_reply is an empty string to indicate this. */
if (!smtp_batched_input)
{
if (smtp_reply == NULL)
{
if (fake_response != OK)
- smtp_respond(fake_response == DEFER ? 450 : 550,
- TRUE, fake_response_text);
+ smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
+ fake_response_text);
+
+ /* An OK response is required; use "message" text if present. */
+
+ else if (user_msg != NULL)
+ {
+ uschar *code = US"250";
+ int len = 3;
+ smtp_message_code(&code, &len, &user_msg, NULL);
+ smtp_respond(code, len, TRUE, user_msg);
+ }
+
+ /* Default OK response */
+
else
smtp_printf("250 OK id=%s\r\n", message_id);
if (host_checking)
fprintf(stdout,
"\n**** SMTP testing: that is not a real message id!\n\n");
}
+
+ /* smtp_reply is set non-empty */
+
else if (smtp_reply[0] != 0)
{
if (fake_response != OK && (smtp_reply[0] == '2'))
- smtp_respond(fake_response == DEFER ? 450 : 550,
- TRUE, fake_response_text);
+ smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
+ fake_response_text);
else
smtp_printf("%.1024s\r\n", smtp_reply);
}
git://git.exim.org / exim.git / blobdiff