Commit | Line | Data |
---|---|---|
420a0d19 CE |
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 *spool_mbox(unsigned long *mbox_file_size, uschar *source_file_override) { | |
30 | uschar message_subdir[2]; | |
31 | uschar buffer[16384]; | |
32 | uschar *temp_string; | |
33 | uschar *mbox_path; | |
34 | FILE *mbox_file = NULL; | |
35 | FILE *data_file = NULL; | |
36 | FILE *yield = NULL; | |
37 | header_line *my_headerlist; | |
38 | struct stat statbuf; | |
39 | int i, j; | |
40 | void *reset_point = store_get(0); | |
41 | ||
42 | mbox_path = string_sprintf("%s/scan/%s/%s.eml", spool_directory, message_id, | |
43 | message_id); | |
44 | ||
45 | /* Skip creation if already spooled out as mbox file */ | |
46 | if (!spool_mbox_ok) { | |
47 | /* create temp directory inside scan dir, directory_make works recursively */ | |
48 | temp_string = string_sprintf("scan/%s", message_id); | |
49 | if (!directory_make(spool_directory, temp_string, 0750, FALSE)) { | |
50 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
51 | "scan directory %s/scan/%s", spool_directory, temp_string)); | |
52 | goto OUT; | |
53 | }; | |
54 | ||
55 | /* open [message_id].eml file for writing */ | |
56 | mbox_file = modefopen(mbox_path, "wb", SPOOL_MODE); | |
57 | if (mbox_file == NULL) { | |
58 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
59 | "scan file %s", mbox_path)); | |
60 | goto OUT; | |
61 | }; | |
62 | ||
63 | /* Generate mailbox headers. The $received_for variable is (up to at least | |
64 | Exim 4.64) never set here, because it is only set when expanding the | |
65 | contents of the Received: header line. However, the code below will use it | |
66 | if it should become available in future. */ | |
67 | ||
68 | temp_string = expand_string( | |
69 | US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n" | |
70 | "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}" | |
71 | "${if def:recipients{X-Envelope-To: ${recipients}\n}}"); | |
72 | ||
73 | if (temp_string != NULL) { | |
74 | i = fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file); | |
75 | if (i != 1) { | |
76 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
77 | mailbox headers to %s", mbox_path); | |
78 | goto OUT; | |
79 | }; | |
80 | }; | |
81 | ||
82 | /* write all header lines to mbox file */ | |
83 | my_headerlist = header_list; | |
84 | for (my_headerlist = header_list; my_headerlist != NULL; | |
85 | my_headerlist = my_headerlist->next) | |
86 | { | |
87 | /* skip deleted headers */ | |
88 | if (my_headerlist->type == '*') continue; | |
89 | ||
90 | i = fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file); | |
91 | if (i != 1) { | |
92 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
93 | message headers to %s", mbox_path); | |
94 | goto OUT; | |
95 | }; | |
96 | }; | |
97 | ||
98 | /* End headers */ | |
99 | if (fwrite("\n", 1, 1, mbox_file) != 1) { | |
100 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
101 | message headers to %s", mbox_path); | |
102 | goto OUT; | |
103 | } | |
104 | ||
105 | /* copy body file */ | |
106 | if (source_file_override == NULL) { | |
107 | message_subdir[1] = '\0'; | |
108 | for (i = 0; i < 2; i++) { | |
109 | message_subdir[0] = (split_spool_directory == (i == 0))? message_id[5] : 0; | |
110 | temp_string = string_sprintf("%s/input/%s/%s-D", spool_directory, | |
111 | message_subdir, message_id); | |
112 | data_file = Ufopen(temp_string, "rb"); | |
113 | if (data_file != NULL) break; | |
114 | }; | |
115 | } else { | |
116 | data_file = Ufopen(source_file_override, "rb"); | |
117 | }; | |
118 | ||
119 | if (data_file == NULL) { | |
120 | log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s", | |
121 | message_id); | |
122 | goto OUT; | |
123 | }; | |
124 | ||
125 | /* The code used to use this line, but it doesn't work in Cygwin. | |
126 | * | |
127 | * (void)fread(data_buffer, 1, 18, data_file); | |
128 | * | |
129 | * What's happening is that spool_mbox used to use an fread to jump over the | |
130 | * file header. That fails under Cygwin because the header is locked, but | |
131 | * doing an fseek succeeds. We have to output the leading newline | |
132 | * explicitly, because the one in the file is parted of the locked area. | |
133 | */ | |
134 | ||
135 | if (!source_file_override) | |
136 | (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET); | |
137 | ||
138 | do { | |
139 | j = fread(buffer, 1, sizeof(buffer), data_file); | |
140 | ||
141 | if (j > 0) { | |
142 | i = fwrite(buffer, j, 1, mbox_file); | |
143 | if (i != 1) { | |
144 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
145 | message body to %s", mbox_path); | |
146 | goto OUT; | |
147 | }; | |
148 | }; | |
149 | } while (j > 0); | |
150 | ||
151 | (void)fclose(mbox_file); | |
152 | mbox_file = NULL; | |
153 | ||
154 | Ustrcpy(spooled_message_id, message_id); | |
155 | spool_mbox_ok = 1; | |
156 | }; | |
157 | ||
158 | /* get the size of the mbox message and open [message_id].eml file for reading*/ | |
159 | if (Ustat(mbox_path, &statbuf) != 0 || | |
160 | (yield = Ufopen(mbox_path,"rb")) == NULL) { | |
161 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
162 | "scan file %s", mbox_path)); | |
163 | goto OUT; | |
164 | }; | |
165 | ||
166 | *mbox_file_size = statbuf.st_size; | |
167 | ||
168 | OUT: | |
169 | if (data_file) (void)fclose(data_file); | |
170 | if (mbox_file) (void)fclose(mbox_file); | |
171 | store_reset(reset_point); | |
172 | return yield; | |
173 | } | |
174 | ||
175 | /* remove mbox spool file, demimed files and temp directory */ | |
176 | void unspool_mbox(void) { | |
177 | ||
178 | /* reset all exiscan state variables */ | |
179 | #ifdef WITH_OLD_DEMIME | |
180 | demime_ok = 0; | |
181 | demime_errorlevel = 0; | |
182 | demime_reason = NULL; | |
183 | file_extensions = NULL; | |
184 | #endif | |
185 | ||
186 | spam_ok = 0; | |
187 | malware_ok = 0; | |
188 | ||
189 | if (spool_mbox_ok && !no_mbox_unspool) { | |
190 | uschar *mbox_path; | |
191 | uschar *file_path; | |
192 | int n; | |
193 | struct dirent *entry; | |
194 | DIR *tempdir; | |
195 | ||
196 | mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id); | |
197 | ||
198 | tempdir = opendir(CS mbox_path); | |
199 | if (!tempdir) { | |
200 | debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno)); | |
201 | /* Just in case we still can: */ | |
202 | rmdir(CS mbox_path); | |
203 | return; | |
204 | } | |
205 | /* loop thru dir & delete entries */ | |
206 | while((entry = readdir(tempdir)) != NULL) { | |
207 | uschar *name = US entry->d_name; | |
208 | if (Ustrcmp(name, US".") == 0 || Ustrcmp(name, US"..") == 0) continue; | |
209 | ||
210 | file_path = string_sprintf("%s/%s", mbox_path, name); | |
211 | debug_printf("unspool_mbox(): unlinking '%s'\n", file_path); | |
212 | n = unlink(CS file_path); | |
213 | }; | |
214 | ||
215 | closedir(tempdir); | |
216 | ||
217 | /* remove directory */ | |
218 | rmdir(CS mbox_path); | |
219 | store_reset(mbox_path); | |
220 | }; | |
221 | spool_mbox_ok = 0; | |
222 | } | |
223 | ||
224 | #endif |