1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
8 /* Code for setting up a MBOX style spool file inside a /scan/<msgid>
9 sub directory of exim's spool directory. */
12 #ifdef WITH_CONTENT_SCAN
14 /* externals, we must reset them on unspooling */
15 #ifdef WITH_OLD_DEMIME
17 extern struct file_extension
*file_extensions
;
20 extern int malware_ok
;
23 int spool_mbox_ok
= 0;
24 uschar spooled_message_id
[17];
26 /* returns a pointer to the FILE, and puts the size in bytes into mbox_file_size
27 * normally, source_file_override is NULL */
30 spool_mbox(unsigned long *mbox_file_size
, const uschar
*source_file_override
)
32 uschar message_subdir
[2];
36 FILE *mbox_file
= NULL
;
37 FILE *data_file
= NULL
;
39 header_line
*my_headerlist
;
42 void *reset_point
= store_get(0);
44 mbox_path
= string_sprintf("%s/scan/%s/%s.eml", spool_directory
, message_id
,
47 /* Skip creation if already spooled out as mbox file */
49 /* create temp directory inside scan dir, directory_make works recursively */
50 temp_string
= string_sprintf("scan/%s", message_id
);
51 if (!directory_make(spool_directory
, temp_string
, 0750, FALSE
)) {
52 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s", string_open_failed(errno
,
53 "scan directory %s/scan/%s", spool_directory
, temp_string
));
57 /* open [message_id].eml file for writing */
58 mbox_file
= modefopen(mbox_path
, "wb", SPOOL_MODE
);
59 if (mbox_file
== NULL
) {
60 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s", string_open_failed(errno
,
61 "scan file %s", mbox_path
));
65 /* Generate mailbox headers. The $received_for variable is (up to at least
66 Exim 4.64) never set here, because it is only set when expanding the
67 contents of the Received: header line. However, the code below will use it
68 if it should become available in future. */
70 temp_string
= expand_string(
71 US
"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n"
72 "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}"
73 "${if def:recipients{X-Envelope-To: ${recipients}\n}}");
75 if (temp_string
!= NULL
) {
76 i
= fwrite(temp_string
, Ustrlen(temp_string
), 1, mbox_file
);
78 log_write(0, LOG_MAIN
|LOG_PANIC
, "Error/short write while writing \
79 mailbox headers to %s", mbox_path
);
84 /* write all header lines to mbox file */
85 my_headerlist
= header_list
;
86 for (my_headerlist
= header_list
; my_headerlist
!= NULL
;
87 my_headerlist
= my_headerlist
->next
)
89 /* skip deleted headers */
90 if (my_headerlist
->type
== '*') continue;
92 i
= fwrite(my_headerlist
->text
, my_headerlist
->slen
, 1, mbox_file
);
94 log_write(0, LOG_MAIN
|LOG_PANIC
, "Error/short write while writing \
95 message headers to %s", mbox_path
);
101 if (fwrite("\n", 1, 1, mbox_file
) != 1) {
102 log_write(0, LOG_MAIN
|LOG_PANIC
, "Error/short write while writing \
103 message headers to %s", mbox_path
);
108 if (source_file_override
== NULL
) {
109 message_subdir
[1] = '\0';
110 for (i
= 0; i
< 2; i
++) {
111 message_subdir
[0] = (split_spool_directory
== (i
== 0))? message_id
[5] : 0;
112 temp_string
= string_sprintf("%s/input/%s/%s-D", spool_directory
,
113 message_subdir
, message_id
);
114 data_file
= Ufopen(temp_string
, "rb");
115 if (data_file
!= NULL
) break;
118 data_file
= Ufopen(source_file_override
, "rb");
121 if (data_file
== NULL
) {
122 log_write(0, LOG_MAIN
|LOG_PANIC
, "Could not open datafile for message %s",
127 /* The code used to use this line, but it doesn't work in Cygwin.
129 * (void)fread(data_buffer, 1, 18, data_file);
131 * What's happening is that spool_mbox used to use an fread to jump over the
132 * file header. That fails under Cygwin because the header is locked, but
133 * doing an fseek succeeds. We have to output the leading newline
134 * explicitly, because the one in the file is parted of the locked area.
137 if (!source_file_override
)
138 (void)fseek(data_file
, SPOOL_DATA_START_OFFSET
, SEEK_SET
);
141 j
= fread(buffer
, 1, sizeof(buffer
), data_file
);
144 i
= fwrite(buffer
, j
, 1, mbox_file
);
146 log_write(0, LOG_MAIN
|LOG_PANIC
, "Error/short write while writing \
147 message body to %s", mbox_path
);
153 (void)fclose(mbox_file
);
156 Ustrcpy(spooled_message_id
, message_id
);
160 /* get the size of the mbox message and open [message_id].eml file for reading*/
161 if (Ustat(mbox_path
, &statbuf
) != 0 ||
162 (yield
= Ufopen(mbox_path
,"rb")) == NULL
) {
163 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s", string_open_failed(errno
,
164 "scan file %s", mbox_path
));
168 *mbox_file_size
= statbuf
.st_size
;
171 if (data_file
) (void)fclose(data_file
);
172 if (mbox_file
) (void)fclose(mbox_file
);
173 store_reset(reset_point
);
177 /* remove mbox spool file, demimed files and temp directory */
178 void unspool_mbox(void) {
180 /* reset all exiscan state variables */
181 #ifdef WITH_OLD_DEMIME
183 demime_errorlevel
= 0;
184 demime_reason
= NULL
;
185 file_extensions
= NULL
;
191 if (spool_mbox_ok
&& !no_mbox_unspool
) {
195 struct dirent
*entry
;
198 mbox_path
= string_sprintf("%s/scan/%s", spool_directory
, spooled_message_id
);
200 tempdir
= opendir(CS mbox_path
);
202 debug_printf("Unable to opendir(%s): %s\n", mbox_path
, strerror(errno
));
203 /* Just in case we still can: */
207 /* loop thru dir & delete entries */
208 while((entry
= readdir(tempdir
)) != NULL
) {
209 uschar
*name
= US entry
->d_name
;
210 if (Ustrcmp(name
, US
".") == 0 || Ustrcmp(name
, US
"..") == 0) continue;
212 file_path
= string_sprintf("%s/%s", mbox_path
, name
);
213 debug_printf("unspool_mbox(): unlinking '%s'\n", file_path
);
214 n
= unlink(CS file_path
);
219 /* remove directory */
221 store_reset(mbox_path
);