Commit | Line | Data |
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420a0d19 CE |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
2ea97746 CE |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
7 | * Copyright (c) The Exim Maintainers 2016 - 2018 | |
8 | */ | |
420a0d19 CE |
9 | |
10 | /* Code for setting up a MBOX style spool file inside a /scan/<msgid> | |
11 | sub directory of exim's spool directory. */ | |
12 | ||
13 | #include "exim.h" | |
14 | #ifdef WITH_CONTENT_SCAN | |
15 | ||
420a0d19 CE |
16 | extern int malware_ok; |
17 | extern int spam_ok; | |
18 | ||
19 | int spool_mbox_ok = 0; | |
2ea97746 CE |
20 | uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
21 | ||
22 | /* | |
23 | Create an MBOX-style message file from the spooled files. | |
24 | ||
25 | Returns a pointer to the FILE, and puts the size in bytes into mbox_file_size. | |
26 | If mbox_fname is non-null, fill in a pointer to the name. | |
27 | Normally, source_file_override is NULL | |
28 | */ | |
29 | ||
30 | FILE * | |
31 | spool_mbox(unsigned long *mbox_file_size, const uschar *source_file_override, | |
32 | uschar ** mbox_fname) | |
33 | { | |
34 | uschar message_subdir[2]; | |
35 | uschar buffer[16384]; | |
36 | uschar *temp_string; | |
37 | uschar *mbox_path; | |
38 | FILE *mbox_file = NULL, *l_data_file = NULL, *yield = NULL; | |
39 | header_line *my_headerlist; | |
40 | struct stat statbuf; | |
41 | int i, j; | |
42 | void *reset_point; | |
43 | ||
44 | mbox_path = string_sprintf("%s/scan/%s/%s.eml", | |
45 | spool_directory, message_id, message_id); | |
46 | if (mbox_fname) *mbox_fname = mbox_path; | |
47 | ||
48 | reset_point = store_get(0); | |
49 | ||
50 | /* Skip creation if already spooled out as mbox file */ | |
51 | if (!spool_mbox_ok) | |
52 | { | |
53 | /* create temp directory inside scan dir, directory_make works recursively */ | |
54 | temp_string = string_sprintf("scan/%s", message_id); | |
55 | if (!directory_make(spool_directory, temp_string, 0750, FALSE)) | |
56 | { | |
57 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
58 | "scan directory %s/scan/%s", spool_directory, temp_string)); | |
59 | goto OUT; | |
60 | } | |
420a0d19 | 61 | |
2ea97746 | 62 | /* open [message_id].eml file for writing */ |
420a0d19 | 63 | |
2ea97746 CE |
64 | if (!(mbox_file = modefopen(mbox_path, "wb", SPOOL_MODE))) |
65 | { | |
66 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
67 | "scan file %s", mbox_path)); | |
68 | goto OUT; | |
69 | } | |
420a0d19 | 70 | |
2ea97746 CE |
71 | /* Generate mailbox headers. The $received_for variable is (up to at least |
72 | Exim 4.64) never set here, because it is only set when expanding the | |
73 | contents of the Received: header line. However, the code below will use it | |
74 | if it should become available in future. */ | |
75 | ||
76 | temp_string = expand_string( | |
77 | US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n" | |
78 | "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}" | |
79 | "${if def:recipients{X-Envelope-To: ${recipients}\n}}"); | |
80 | ||
81 | if (temp_string) | |
82 | if (fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file) != 1) | |
83 | { | |
84 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
85 | mailbox headers to %s", mbox_path); | |
420a0d19 | 86 | goto OUT; |
2ea97746 CE |
87 | } |
88 | ||
89 | /* write all non-deleted header lines to mbox file */ | |
90 | ||
91 | for (my_headerlist = header_list; my_headerlist; | |
420a0d19 | 92 | my_headerlist = my_headerlist->next) |
2ea97746 CE |
93 | if (my_headerlist->type != '*') |
94 | if (fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file) != 1) | |
95 | { | |
96 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
97 | message headers to %s", mbox_path); | |
98 | goto OUT; | |
99 | } | |
100 | ||
101 | /* End headers */ | |
102 | if (fwrite("\n", 1, 1, mbox_file) != 1) | |
420a0d19 | 103 | { |
2ea97746 CE |
104 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ |
105 | message headers to %s", mbox_path); | |
106 | goto OUT; | |
420a0d19 CE |
107 | } |
108 | ||
2ea97746 CE |
109 | /* Copy body file. If the main receive still has it open then it is holding |
110 | a lock, and we must not close it (which releases the lock), so just use the | |
111 | global file handle. */ | |
112 | if (source_file_override) | |
113 | l_data_file = Ufopen(source_file_override, "rb"); | |
114 | else if (spool_data_file) | |
115 | l_data_file = spool_data_file; | |
116 | else | |
117 | { | |
118 | message_subdir[1] = '\0'; | |
119 | for (i = 0; i < 2; i++) | |
120 | { | |
121 | message_subdir[0] = split_spool_directory == (i == 0) ? message_id[5] : 0; | |
122 | temp_string = spool_fname(US"input", message_subdir, message_id, US"-D"); | |
123 | if ((l_data_file = Ufopen(temp_string, "rb"))) break; | |
124 | } | |
125 | } | |
126 | ||
127 | if (!l_data_file) | |
128 | { | |
129 | log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s", | |
130 | message_id); | |
131 | goto OUT; | |
132 | } | |
133 | ||
134 | /* The code used to use this line, but it doesn't work in Cygwin. | |
135 | ||
136 | (void)fread(data_buffer, 1, 18, l_data_file); | |
137 | ||
138 | What's happening is that spool_mbox used to use an fread to jump over the | |
139 | file header. That fails under Cygwin because the header is locked, but | |
140 | doing an fseek succeeds. We have to output the leading newline | |
141 | explicitly, because the one in the file is parted of the locked area. */ | |
142 | ||
143 | if (!source_file_override) | |
144 | (void)fseek(l_data_file, SPOOL_DATA_START_OFFSET, SEEK_SET); | |
145 | ||
146 | do | |
147 | { | |
148 | uschar * s; | |
149 | ||
150 | if (!f.spool_file_wireformat || source_file_override) | |
151 | j = fread(buffer, 1, sizeof(buffer), l_data_file); | |
152 | else /* needs CRLF -> NL */ | |
153 | if ((s = US fgets(CS buffer, sizeof(buffer), l_data_file))) | |
154 | { | |
155 | uschar * p = s + Ustrlen(s) - 1; | |
156 | ||
157 | if (*p == '\n' && p[-1] == '\r') | |
158 | *--p = '\n'; | |
159 | else if (*p == '\r') | |
160 | ungetc(*p--, l_data_file); | |
161 | ||
162 | j = p - buffer; | |
163 | } | |
164 | else | |
165 | j = 0; | |
166 | ||
167 | if (j > 0) | |
168 | if (fwrite(buffer, j, 1, mbox_file) != 1) | |
169 | { | |
170 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
171 | message body to %s", mbox_path); | |
172 | goto OUT; | |
173 | } | |
420a0d19 CE |
174 | } while (j > 0); |
175 | ||
2ea97746 CE |
176 | (void)fclose(mbox_file); |
177 | mbox_file = NULL; | |
420a0d19 | 178 | |
2ea97746 CE |
179 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
180 | spooled_message_id[sizeof(spooled_message_id)-1] = '\0'; | |
181 | spool_mbox_ok = 1; | |
182 | } | |
420a0d19 | 183 | |
2ea97746 | 184 | /* get the size of the mbox message and open [message_id].eml file for reading*/ |
420a0d19 | 185 | |
2ea97746 CE |
186 | if ( !(yield = Ufopen(mbox_path,"rb")) |
187 | || fstat(fileno(yield), &statbuf) != 0 | |
188 | ) | |
189 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
190 | "scan file %s", mbox_path)); | |
191 | else | |
420a0d19 CE |
192 | *mbox_file_size = statbuf.st_size; |
193 | ||
2ea97746 CE |
194 | OUT: |
195 | if (l_data_file && !spool_data_file) (void)fclose(l_data_file); | |
196 | if (mbox_file) (void)fclose(mbox_file); | |
197 | store_reset(reset_point); | |
198 | return yield; | |
420a0d19 CE |
199 | } |
200 | ||
420a0d19 | 201 | |
420a0d19 | 202 | |
420a0d19 | 203 | |
2ea97746 CE |
204 | |
205 | /* remove mbox spool file and temp directory */ | |
206 | void | |
207 | unspool_mbox(void) | |
208 | { | |
209 | spam_ok = 0; | |
210 | malware_ok = 0; | |
211 | ||
212 | if (spool_mbox_ok && !f.no_mbox_unspool) | |
213 | { | |
214 | uschar *mbox_path; | |
215 | uschar *file_path; | |
216 | struct dirent *entry; | |
217 | DIR *tempdir; | |
218 | ||
219 | mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id); | |
220 | ||
221 | if (!(tempdir = opendir(CS mbox_path))) | |
222 | { | |
223 | debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno)); | |
224 | /* Just in case we still can: */ | |
420a0d19 | 225 | rmdir(CS mbox_path); |
2ea97746 CE |
226 | return; |
227 | } | |
228 | /* loop thru dir & delete entries */ | |
229 | while((entry = readdir(tempdir))) | |
230 | { | |
231 | uschar *name = US entry->d_name; | |
232 | int dummy; | |
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 | dummy = unlink(CS file_path); dummy = dummy; /* compiler quietening */ | |
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; | |
420a0d19 CE |
247 | } |
248 | ||
249 | #endif |