edc28034c89d5b687fa95161f01a3adc81e8e12f
[exim.git] / src / src / spool_mbox.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
6 /* License: GPL */
7
8 /* Code for setting up a MBOX style spool file inside a /scan/<msgid>
9 sub directory of exim's spool directory. */
10
11 #include "exim.h"
12 #ifdef WITH_CONTENT_SCAN
13
14 /* externals, we must reset them on unspooling */
15 #ifdef WITH_OLD_DEMIME
16 extern int demime_ok;
17 extern struct file_extension *file_extensions;
18 #endif
19
20 extern int malware_ok;
21 extern int spam_ok;
22
23 int spool_mbox_ok = 0;
24 uschar spooled_message_id[17];
25
26 /* returns a pointer to the FILE, and puts the size in bytes into mbox_file_size
27 * normally, source_file_override is NULL */
28
29 FILE *
30 spool_mbox(unsigned long *mbox_file_size, const uschar *source_file_override)
31 {
32 uschar message_subdir[2];
33 uschar buffer[16384];
34 uschar *temp_string;
35 uschar *mbox_path;
36 FILE *mbox_file = NULL;
37 FILE *data_file = NULL;
38 FILE *yield = NULL;
39 header_line *my_headerlist;
40 struct stat statbuf;
41 int i, j;
42 void *reset_point = store_get(0);
43
44 mbox_path = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id,
45 message_id);
46
47 /* Skip creation if already spooled out as mbox file */
48 if (!spool_mbox_ok) {
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));
54 goto OUT;
55 };
56
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));
62 goto OUT;
63 };
64
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. */
69
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}}");
74
75 if (temp_string != NULL) {
76 i = fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file);
77 if (i != 1) {
78 log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
79 mailbox headers to %s", mbox_path);
80 goto OUT;
81 };
82 };
83
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)
88 {
89 /* skip deleted headers */
90 if (my_headerlist->type == '*') continue;
91
92 i = fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file);
93 if (i != 1) {
94 log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
95 message headers to %s", mbox_path);
96 goto OUT;
97 };
98 };
99
100 /* End headers */
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);
104 goto OUT;
105 }
106
107 /* copy body file */
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;
116 };
117 } else {
118 data_file = Ufopen(source_file_override, "rb");
119 };
120
121 if (data_file == NULL) {
122 log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s",
123 message_id);
124 goto OUT;
125 };
126
127 /* The code used to use this line, but it doesn't work in Cygwin.
128 *
129 * (void)fread(data_buffer, 1, 18, data_file);
130 *
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.
135 */
136
137 if (!source_file_override)
138 (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET);
139
140 do {
141 j = fread(buffer, 1, sizeof(buffer), data_file);
142
143 if (j > 0) {
144 i = fwrite(buffer, j, 1, mbox_file);
145 if (i != 1) {
146 log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
147 message body to %s", mbox_path);
148 goto OUT;
149 };
150 };
151 } while (j > 0);
152
153 (void)fclose(mbox_file);
154 mbox_file = NULL;
155
156 Ustrcpy(spooled_message_id, message_id);
157 spool_mbox_ok = 1;
158 };
159
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));
165 goto OUT;
166 };
167
168 *mbox_file_size = statbuf.st_size;
169
170 OUT:
171 if (data_file) (void)fclose(data_file);
172 if (mbox_file) (void)fclose(mbox_file);
173 store_reset(reset_point);
174 return yield;
175 }
176
177 /* remove mbox spool file, demimed files and temp directory */
178 void unspool_mbox(void) {
179
180 /* reset all exiscan state variables */
181 #ifdef WITH_OLD_DEMIME
182 demime_ok = 0;
183 demime_errorlevel = 0;
184 demime_reason = NULL;
185 file_extensions = NULL;
186 #endif
187
188 spam_ok = 0;
189 malware_ok = 0;
190
191 if (spool_mbox_ok && !no_mbox_unspool) {
192 uschar *mbox_path;
193 uschar *file_path;
194 int n;
195 struct dirent *entry;
196 DIR *tempdir;
197
198 mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id);
199
200 tempdir = opendir(CS mbox_path);
201 if (!tempdir) {
202 debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno));
203 /* Just in case we still can: */
204 rmdir(CS mbox_path);
205 return;
206 }
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;
211
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);
215 };
216
217 closedir(tempdir);
218
219 /* remove directory */
220 rmdir(CS mbox_path);
221 store_reset(mbox_path);
222 };
223 spool_mbox_ok = 0;
224 }
225
226 #endif