Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 JH |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 |
6 | * License: GPL | |
f9ba5e22 | 7 | * Copyright (c) The Exim Maintainers 2016 - 2018 |
80fea873 | 8 | */ |
8523533c TK |
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 | ||
8523533c TK |
16 | extern int malware_ok; |
17 | extern int spam_ok; | |
18 | ||
19 | int spool_mbox_ok = 0; | |
6e3b198d | 20 | uschar spooled_message_id[MESSAGE_ID_LENGTH+1]; |
8523533c | 21 | |
040721f2 JH |
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 | */ | |
8523533c | 29 | |
0f0c8159 | 30 | FILE * |
040721f2 JH |
31 | spool_mbox(unsigned long *mbox_file_size, const uschar *source_file_override, |
32 | uschar ** mbox_fname) | |
0f0c8159 | 33 | { |
3c51463e JH |
34 | uschar message_subdir[2]; |
35 | uschar buffer[16384]; | |
36 | uschar *temp_string; | |
37 | uschar *mbox_path; | |
1bd642c2 | 38 | FILE *mbox_file = NULL, *l_data_file = NULL, *yield = NULL; |
3c51463e | 39 | struct stat statbuf; |
db3f7b69 | 40 | int j; |
040721f2 JH |
41 | void *reset_point; |
42 | ||
43 | mbox_path = string_sprintf("%s/scan/%s/%s.eml", | |
44 | spool_directory, message_id, message_id); | |
45 | if (mbox_fname) *mbox_fname = mbox_path; | |
3c51463e | 46 | |
040721f2 | 47 | reset_point = store_get(0); |
3c51463e JH |
48 | |
49 | /* Skip creation if already spooled out as mbox file */ | |
50 | if (!spool_mbox_ok) | |
51 | { | |
52 | /* create temp directory inside scan dir, directory_make works recursively */ | |
53 | temp_string = string_sprintf("scan/%s", message_id); | |
54 | if (!directory_make(spool_directory, temp_string, 0750, FALSE)) | |
55 | { | |
56 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
57 | "scan directory %s/scan/%s", spool_directory, temp_string)); | |
58 | goto OUT; | |
59 | } | |
8e669ac1 | 60 | |
3c51463e | 61 | /* open [message_id].eml file for writing */ |
328c5688 JH |
62 | |
63 | if (!(mbox_file = modefopen(mbox_path, "wb", SPOOL_MODE))) | |
3c51463e JH |
64 | { |
65 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, | |
66 | "scan file %s", mbox_path)); | |
67 | goto OUT; | |
68 | } | |
69 | ||
70 | /* Generate mailbox headers. The $received_for variable is (up to at least | |
71 | Exim 4.64) never set here, because it is only set when expanding the | |
72 | contents of the Received: header line. However, the code below will use it | |
73 | if it should become available in future. */ | |
74 | ||
75 | temp_string = expand_string( | |
76 | US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n" | |
77 | "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}" | |
78 | "${if def:recipients{X-Envelope-To: ${recipients}\n}}"); | |
79 | ||
328c5688 JH |
80 | if (temp_string) |
81 | if (fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file) != 1) | |
3c51463e | 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 | } |
f951fd57 | 87 | |
328c5688 | 88 | /* write all non-deleted header lines to mbox file */ |
3c51463e | 89 | |
db3f7b69 | 90 | for (header_line * my_headerlist = header_list; my_headerlist; |
328c5688 JH |
91 | my_headerlist = my_headerlist->next) |
92 | if (my_headerlist->type != '*') | |
93 | if (fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file) != 1) | |
94 | { | |
95 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
96 | message headers to %s", mbox_path); | |
97 | goto OUT; | |
98 | } | |
8e669ac1 | 99 | |
3c51463e JH |
100 | /* End headers */ |
101 | if (fwrite("\n", 1, 1, mbox_file) != 1) | |
102 | { | |
103 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
104 | message headers to %s", mbox_path); | |
105 | goto OUT; | |
106 | } | |
21a04aa3 | 107 | |
1bd642c2 JH |
108 | /* Copy body file. If the main receive still has it open then it is holding |
109 | a lock, and we must not close it (which releases the lock), so just use the | |
110 | global file handle. */ | |
111 | if (source_file_override) | |
112 | l_data_file = Ufopen(source_file_override, "rb"); | |
113 | else if (spool_data_file) | |
114 | l_data_file = spool_data_file; | |
115 | else | |
3c51463e JH |
116 | { |
117 | message_subdir[1] = '\0'; | |
db3f7b69 | 118 | for (int i = 0; i < 2; i++) |
3c51463e | 119 | { |
a2da3176 | 120 | message_subdir[0] = split_spool_directory == (i == 0) ? message_id[5] : 0; |
41313d92 | 121 | temp_string = spool_fname(US"input", message_subdir, message_id, US"-D"); |
1bd642c2 | 122 | if ((l_data_file = Ufopen(temp_string, "rb"))) break; |
3c51463e JH |
123 | } |
124 | } | |
8523533c | 125 | |
1bd642c2 | 126 | if (!l_data_file) |
3c51463e JH |
127 | { |
128 | log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s", | |
129 | message_id); | |
f951fd57 | 130 | goto OUT; |
3c51463e JH |
131 | } |
132 | ||
133 | /* The code used to use this line, but it doesn't work in Cygwin. | |
8523533c | 134 | |
1bd642c2 | 135 | (void)fread(data_buffer, 1, 18, l_data_file); |
f9ba5e22 | 136 | |
3c51463e JH |
137 | What's happening is that spool_mbox used to use an fread to jump over the |
138 | file header. That fails under Cygwin because the header is locked, but | |
139 | doing an fseek succeeds. We have to output the leading newline | |
140 | explicitly, because the one in the file is parted of the locked area. */ | |
8523533c | 141 | |
3c51463e | 142 | if (!source_file_override) |
1bd642c2 | 143 | (void)fseek(l_data_file, SPOOL_DATA_START_OFFSET, SEEK_SET); |
3c51463e JH |
144 | |
145 | do | |
146 | { | |
328c5688 JH |
147 | uschar * s; |
148 | ||
8768d548 | 149 | if (!f.spool_file_wireformat || source_file_override) |
1bd642c2 | 150 | j = fread(buffer, 1, sizeof(buffer), l_data_file); |
328c5688 | 151 | else /* needs CRLF -> NL */ |
1bd642c2 | 152 | if ((s = US fgets(CS buffer, sizeof(buffer), l_data_file))) |
328c5688 JH |
153 | { |
154 | uschar * p = s + Ustrlen(s) - 1; | |
155 | ||
156 | if (*p == '\n' && p[-1] == '\r') | |
157 | *--p = '\n'; | |
158 | else if (*p == '\r') | |
1bd642c2 | 159 | ungetc(*p--, l_data_file); |
328c5688 JH |
160 | |
161 | j = p - buffer; | |
162 | } | |
163 | else | |
164 | j = 0; | |
3c51463e JH |
165 | |
166 | if (j > 0) | |
328c5688 | 167 | if (fwrite(buffer, j, 1, mbox_file) != 1) |
3c51463e JH |
168 | { |
169 | log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \ | |
170 | message body to %s", mbox_path); | |
171 | goto OUT; | |
172 | } | |
3c51463e JH |
173 | } while (j > 0); |
174 | ||
175 | (void)fclose(mbox_file); | |
176 | mbox_file = NULL; | |
177 | ||
8d468c4c JH |
178 | Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id)); |
179 | spooled_message_id[sizeof(spooled_message_id)-1] = '\0'; | |
3c51463e JH |
180 | spool_mbox_ok = 1; |
181 | } | |
182 | ||
183 | /* get the size of the mbox message and open [message_id].eml file for reading*/ | |
10c50704 JH |
184 | |
185 | if ( !(yield = Ufopen(mbox_path,"rb")) | |
186 | || fstat(fileno(yield), &statbuf) != 0 | |
187 | ) | |
3c51463e JH |
188 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno, |
189 | "scan file %s", mbox_path)); | |
10c50704 JH |
190 | else |
191 | *mbox_file_size = statbuf.st_size; | |
3c51463e JH |
192 | |
193 | OUT: | |
1bd642c2 | 194 | if (l_data_file && !spool_data_file) (void)fclose(l_data_file); |
3c51463e JH |
195 | if (mbox_file) (void)fclose(mbox_file); |
196 | store_reset(reset_point); | |
197 | return yield; | |
8523533c TK |
198 | } |
199 | ||
3c51463e JH |
200 | |
201 | ||
202 | ||
8e669ac1 | 203 | |
03d5892b | 204 | /* remove mbox spool file and temp directory */ |
3c51463e JH |
205 | void |
206 | unspool_mbox(void) | |
207 | { | |
3c51463e JH |
208 | spam_ok = 0; |
209 | malware_ok = 0; | |
8e669ac1 | 210 | |
8768d548 | 211 | if (spool_mbox_ok && !f.no_mbox_unspool) |
3c51463e JH |
212 | { |
213 | uschar *mbox_path; | |
214 | uschar *file_path; | |
3c51463e JH |
215 | struct dirent *entry; |
216 | DIR *tempdir; | |
217 | ||
218 | mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id); | |
219 | ||
cab0c277 | 220 | if (!(tempdir = opendir(CS mbox_path))) |
3c51463e JH |
221 | { |
222 | debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno)); | |
223 | /* Just in case we still can: */ | |
f951fd57 | 224 | rmdir(CS mbox_path); |
3c51463e JH |
225 | return; |
226 | } | |
227 | /* loop thru dir & delete entries */ | |
cab0c277 | 228 | while((entry = readdir(tempdir))) |
3c51463e JH |
229 | { |
230 | uschar *name = US entry->d_name; | |
4dc2379a | 231 | int dummy; |
3c51463e JH |
232 | if (Ustrcmp(name, US".") == 0 || Ustrcmp(name, US"..") == 0) continue; |
233 | ||
234 | file_path = string_sprintf("%s/%s", mbox_path, name); | |
235 | debug_printf("unspool_mbox(): unlinking '%s'\n", file_path); | |
cab0c277 | 236 | dummy = unlink(CS file_path); dummy = dummy; /* compiler quietening */ |
3c51463e JH |
237 | } |
238 | ||
239 | closedir(tempdir); | |
240 | ||
241 | /* remove directory */ | |
242 | rmdir(CS mbox_path); | |
243 | store_reset(mbox_path); | |
244 | } | |
245 | spool_mbox_ok = 0; | |
8523533c TK |
246 | } |
247 | ||
248 | #endif |