Commit | Line | Data |
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8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 */ |
8523533c TK |
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; | |
6e3b198d | 24 | uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
8523533c | 25 | |
8544e77a PP |
26 | /* returns a pointer to the FILE, and puts the size in bytes into mbox_file_size |
27 | * normally, source_file_override is NULL */ | |
8523533c | 28 | |
0f0c8159 JH |
29 | FILE * |
30 | spool_mbox(unsigned long *mbox_file_size, const uschar *source_file_override) | |
31 | { | |
3c51463e JH |
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 | { | |
50 | /* create temp directory inside scan dir, directory_make works recursively */ | |
51 | temp_string = string_sprintf("scan/%s", message_id); | |
52 | if (!directory_make(spool_directory, temp_string, 0750, FALSE)) | |
53 | { | |
54 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
55 | "scan directory %s/scan/%s", spool_directory, temp_string)); | |
56 | goto OUT; | |
57 | } | |
8e669ac1 | 58 | |
3c51463e JH |
59 | /* open [message_id].eml file for writing */ |
60 | mbox_file = modefopen(mbox_path, "wb", SPOOL_MODE); | |
61 | if (mbox_file == NULL) | |
62 | { | |
63 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
64 | "scan file %s", mbox_path)); | |
65 | goto OUT; | |
66 | } | |
67 | ||
68 | /* Generate mailbox headers. The $received_for variable is (up to at least | |
69 | Exim 4.64) never set here, because it is only set when expanding the | |
70 | contents of the Received: header line. However, the code below will use it | |
71 | if it should become available in future. */ | |
72 | ||
73 | temp_string = expand_string( | |
74 | US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n" | |
75 | "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}" | |
76 | "${if def:recipients{X-Envelope-To: ${recipients}\n}}"); | |
77 | ||
78 | if (temp_string != NULL) | |
f951fd57 | 79 | { |
3c51463e JH |
80 | i = fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file); |
81 | if (i != 1) | |
82 | { | |
1ac6b2e7 | 83 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ |
3c51463e | 84 | mailbox headers to %s", mbox_path); |
1ac6b2e7 | 85 | goto OUT; |
3c51463e | 86 | } |
1ac6b2e7 | 87 | } |
f951fd57 | 88 | |
3c51463e JH |
89 | /* write all header lines to mbox file */ |
90 | my_headerlist = header_list; | |
91 | for (my_headerlist = header_list; my_headerlist != NULL; | |
92 | my_headerlist = my_headerlist->next) | |
93 | { | |
94 | /* skip deleted headers */ | |
95 | if (my_headerlist->type == '*') continue; | |
96 | ||
97 | i = fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file); | |
98 | if (i != 1) | |
99 | { | |
100 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
101 | message headers to %s", mbox_path); | |
f951fd57 | 102 | goto OUT; |
3c51463e JH |
103 | } |
104 | } | |
8e669ac1 | 105 | |
3c51463e JH |
106 | /* End headers */ |
107 | if (fwrite("\n", 1, 1, mbox_file) != 1) | |
108 | { | |
109 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
110 | message headers to %s", mbox_path); | |
111 | goto OUT; | |
112 | } | |
21a04aa3 | 113 | |
3c51463e JH |
114 | /* copy body file */ |
115 | if (source_file_override == NULL) | |
116 | { | |
117 | message_subdir[1] = '\0'; | |
118 | for (i = 0; i < 2; i++) | |
119 | { | |
120 | message_subdir[0] = (split_spool_directory == (i == 0))? message_id[5] : 0; | |
121 | temp_string = string_sprintf("%s/input/%s/%s-D", spool_directory, | |
122 | message_subdir, message_id); | |
123 | data_file = Ufopen(temp_string, "rb"); | |
124 | if (data_file != NULL) break; | |
125 | } | |
126 | } | |
127 | else | |
128 | data_file = Ufopen(source_file_override, "rb"); | |
8523533c | 129 | |
3c51463e JH |
130 | if (data_file == NULL) |
131 | { | |
132 | log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s", | |
133 | message_id); | |
f951fd57 | 134 | goto OUT; |
3c51463e JH |
135 | } |
136 | ||
137 | /* The code used to use this line, but it doesn't work in Cygwin. | |
8523533c | 138 | |
3c51463e JH |
139 | (void)fread(data_buffer, 1, 18, data_file); |
140 | ||
141 | What's happening is that spool_mbox used to use an fread to jump over the | |
142 | file header. That fails under Cygwin because the header is locked, but | |
143 | doing an fseek succeeds. We have to output the leading newline | |
144 | explicitly, because the one in the file is parted of the locked area. */ | |
8523533c | 145 | |
3c51463e JH |
146 | if (!source_file_override) |
147 | (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET); | |
148 | ||
149 | do | |
150 | { | |
151 | j = fread(buffer, 1, sizeof(buffer), data_file); | |
152 | ||
153 | if (j > 0) | |
154 | { | |
155 | i = fwrite(buffer, j, 1, mbox_file); | |
156 | if (i != 1) | |
157 | { | |
158 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
159 | message body to %s", mbox_path); | |
160 | goto OUT; | |
161 | } | |
162 | } | |
163 | } while (j > 0); | |
164 | ||
165 | (void)fclose(mbox_file); | |
166 | mbox_file = NULL; | |
167 | ||
8d468c4c JH |
168 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
169 | spooled_message_id[sizeof(spooled_message_id)-1] = '\0'; | |
3c51463e JH |
170 | spool_mbox_ok = 1; |
171 | } | |
172 | ||
173 | /* get the size of the mbox message and open [message_id].eml file for reading*/ | |
174 | if (Ustat(mbox_path, &statbuf) != 0 || | |
175 | (yield = Ufopen(mbox_path,"rb")) == NULL) | |
176 | { | |
177 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
178 | "scan file %s", mbox_path)); | |
179 | goto OUT; | |
180 | } | |
181 | ||
182 | *mbox_file_size = statbuf.st_size; | |
183 | ||
184 | OUT: | |
185 | if (data_file) (void)fclose(data_file); | |
186 | if (mbox_file) (void)fclose(mbox_file); | |
187 | store_reset(reset_point); | |
188 | return yield; | |
8523533c TK |
189 | } |
190 | ||
3c51463e JH |
191 | |
192 | ||
193 | ||
8523533c | 194 | /* remove mbox spool file, demimed files and temp directory */ |
8e669ac1 | 195 | |
3c51463e JH |
196 | void |
197 | unspool_mbox(void) | |
198 | { | |
199 | ||
200 | /* reset all exiscan state variables */ | |
201 | #ifdef WITH_OLD_DEMIME | |
202 | demime_ok = 0; | |
203 | demime_errorlevel = 0; | |
204 | demime_reason = NULL; | |
205 | file_extensions = NULL; | |
206 | #endif | |
8e669ac1 | 207 | |
3c51463e JH |
208 | spam_ok = 0; |
209 | malware_ok = 0; | |
8e669ac1 | 210 | |
3c51463e JH |
211 | if (spool_mbox_ok && !no_mbox_unspool) |
212 | { | |
213 | uschar *mbox_path; | |
214 | uschar *file_path; | |
215 | int n; | |
216 | struct dirent *entry; | |
217 | DIR *tempdir; | |
218 | ||
219 | mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id); | |
220 | ||
221 | tempdir = opendir(CS mbox_path); | |
222 | if (!tempdir) | |
223 | { | |
224 | debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno)); | |
225 | /* Just in case we still can: */ | |
f951fd57 | 226 | rmdir(CS mbox_path); |
3c51463e JH |
227 | return; |
228 | } | |
229 | /* loop thru dir & delete entries */ | |
230 | while((entry = readdir(tempdir)) != NULL) | |
231 | { | |
232 | uschar *name = US entry->d_name; | |
233 | if (Ustrcmp(name, US".") == 0 || Ustrcmp(name, US"..") == 0) continue; | |
234 | ||
235 | file_path = string_sprintf("%s/%s", mbox_path, name); | |
236 | debug_printf("unspool_mbox(): unlinking '%s'\n", file_path); | |
237 | n = unlink(CS file_path); | |
238 | } | |
239 | ||
240 | closedir(tempdir); | |
241 | ||
242 | /* remove directory */ | |
243 | rmdir(CS mbox_path); | |
244 | store_reset(mbox_path); | |
245 | } | |
246 | spool_mbox_ok = 0; | |
8523533c TK |
247 | } |
248 | ||
249 | #endif |