Commit | Line | Data |
---|---|---|
f7b63901 | 1 | /* $Cambridge: exim/src/src/spam.c,v 1.3 2004/12/17 14:52:44 ph10 Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
8 | /* License: GPL */ | |
9 | ||
10 | /* Code for calling spamassassin's spamd. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | #include "spam.h" | |
15 | ||
16 | uschar spam_score_buffer[16]; | |
17 | uschar spam_score_int_buffer[16]; | |
18 | uschar spam_bar_buffer[128]; | |
19 | uschar spam_report_buffer[32600]; | |
20 | uschar prev_user_name[128] = ""; | |
21 | int spam_ok = 0; | |
22 | int spam_rc = 0; | |
23 | ||
24 | int spam(uschar **listptr) { | |
25 | int sep = 0; | |
26 | uschar *list = *listptr; | |
27 | uschar *user_name; | |
28 | uschar user_name_buffer[128]; | |
f7b63901 | 29 | unsigned long mbox_size; |
8523533c TK |
30 | FILE *mbox_file; |
31 | int spamd_sock; | |
32 | uschar spamd_buffer[32600]; | |
33 | int i, j, offset; | |
34 | uschar spamd_version[8]; | |
35 | uschar spamd_score_char; | |
36 | double spamd_threshold, spamd_score; | |
37 | int spamd_report_offset; | |
38 | uschar *p,*q; | |
39 | int override = 0; | |
40 | struct sockaddr_un server; | |
41 | ||
42 | /* find the username from the option list */ | |
43 | if ((user_name = string_nextinlist(&list, &sep, | |
44 | user_name_buffer, | |
45 | sizeof(user_name_buffer))) == NULL) { | |
46 | /* no username given, this means no scanning should be done */ | |
47 | return FAIL; | |
48 | }; | |
49 | ||
50 | /* if username is "0" or "false", do not scan */ | |
51 | if ( (Ustrcmp(user_name,"0") == 0) || | |
52 | (strcmpic(user_name,US"false") == 0) ) { | |
53 | return FAIL; | |
54 | }; | |
55 | ||
56 | /* if there is an additional option, check if it is "true" */ | |
57 | if (strcmpic(list,US"true") == 0) { | |
58 | /* in that case, always return true later */ | |
59 | override = 1; | |
60 | }; | |
61 | ||
62 | /* if we scanned for this username last time, just return */ | |
63 | if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) { | |
64 | if (override) | |
65 | return OK; | |
66 | else | |
67 | return spam_rc; | |
68 | }; | |
69 | ||
70 | /* make sure the eml mbox file is spooled up */ | |
71 | mbox_file = spool_mbox(&mbox_size); | |
72 | ||
73 | if (mbox_file == NULL) { | |
74 | /* error while spooling */ | |
75 | log_write(0, LOG_MAIN|LOG_PANIC, | |
76 | "spam acl condition: error while creating mbox spool file"); | |
77 | return DEFER; | |
78 | }; | |
79 | ||
80 | /* socket does not start with '/' -> network socket */ | |
81 | if (*spamd_address != '/') { | |
82 | time_t now = time(NULL); | |
83 | int num_servers = 0; | |
84 | int current_server = 0; | |
85 | int start_server = 0; | |
86 | uschar *address = NULL; | |
87 | uschar *spamd_address_list_ptr = spamd_address; | |
88 | uschar address_buffer[256]; | |
89 | spamd_address_container * spamd_address_vector[32]; | |
90 | ||
91 | /* Check how many spamd servers we have | |
92 | and register their addresses */ | |
93 | while ((address = string_nextinlist(&spamd_address_list_ptr, &sep, | |
94 | address_buffer, | |
95 | sizeof(address_buffer))) != NULL) { | |
96 | ||
97 | spamd_address_container *this_spamd = | |
98 | (spamd_address_container *)store_get(sizeof(spamd_address_container)); | |
99 | ||
100 | /* grok spamd address and port */ | |
101 | if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) { | |
102 | log_write(0, LOG_MAIN, | |
103 | "spam acl condition: warning - invalid spamd address: '%s'", address); | |
104 | continue; | |
105 | }; | |
106 | ||
107 | spamd_address_vector[num_servers] = this_spamd; | |
108 | num_servers++; | |
109 | if (num_servers > 31) | |
110 | break; | |
111 | }; | |
112 | ||
113 | /* check if we have at least one server */ | |
114 | if (!num_servers) { | |
115 | log_write(0, LOG_MAIN|LOG_PANIC, | |
116 | "spam acl condition: no useable spamd server addresses in spamd_address configuration option."); | |
117 | fclose(mbox_file); | |
118 | return DEFER; | |
119 | }; | |
120 | ||
121 | current_server = start_server = (int)now % num_servers; | |
122 | ||
123 | while (1) { | |
124 | ||
125 | debug_printf("trying server %s, port %u\n", | |
126 | spamd_address_vector[current_server]->tcp_addr, | |
127 | spamd_address_vector[current_server]->tcp_port); | |
128 | ||
129 | /* contact a spamd */ | |
130 | if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
131 | log_write(0, LOG_MAIN|LOG_PANIC, | |
132 | "spam acl condition: error creating IP socket for spamd"); | |
133 | fclose(mbox_file); | |
134 | return DEFER; | |
135 | }; | |
136 | ||
137 | if (ip_connect( spamd_sock, | |
138 | AF_INET, | |
139 | spamd_address_vector[current_server]->tcp_addr, | |
140 | spamd_address_vector[current_server]->tcp_port, | |
141 | 5 ) > -1) { | |
142 | /* connection OK */ | |
143 | break; | |
144 | }; | |
145 | ||
146 | log_write(0, LOG_MAIN|LOG_PANIC, | |
147 | "spam acl condition: warning - spamd connection to %s, port %u failed: %s", | |
148 | spamd_address_vector[current_server]->tcp_addr, | |
149 | spamd_address_vector[current_server]->tcp_port, | |
150 | strerror(errno)); | |
151 | current_server++; | |
152 | if (current_server >= num_servers) | |
153 | current_server = 0; | |
154 | if (current_server == start_server) { | |
155 | log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed"); | |
156 | fclose(mbox_file); | |
157 | close(spamd_sock); | |
158 | return DEFER; | |
159 | }; | |
160 | }; | |
161 | ||
162 | } | |
163 | else { | |
164 | /* open the local socket */ | |
165 | ||
166 | if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
167 | log_write(0, LOG_MAIN|LOG_PANIC, | |
168 | "malware acl condition: spamd: unable to acquire socket (%s)", | |
169 | strerror(errno)); | |
170 | fclose(mbox_file); | |
171 | return DEFER; | |
172 | } | |
173 | ||
174 | server.sun_family = AF_UNIX; | |
175 | Ustrcpy(server.sun_path, spamd_address); | |
176 | ||
177 | if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
178 | log_write(0, LOG_MAIN|LOG_PANIC, | |
179 | "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)", | |
180 | spamd_address, strerror(errno) ); | |
181 | fclose(mbox_file); | |
182 | close(spamd_sock); | |
183 | return DEFER; | |
184 | } | |
185 | ||
186 | } | |
187 | ||
188 | /* now we are connected to spamd on spamd_sock */ | |
189 | snprintf(CS spamd_buffer, | |
190 | sizeof(spamd_buffer), | |
f7b63901 | 191 | "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n", |
8523533c TK |
192 | user_name, |
193 | mbox_size); | |
194 | ||
195 | /* send our request */ | |
196 | if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) { | |
197 | close(spamd_sock); | |
198 | log_write(0, LOG_MAIN|LOG_PANIC, | |
199 | "spam acl condition: spamd send failed: %s", strerror(errno)); | |
200 | fclose(mbox_file); | |
201 | close(spamd_sock); | |
202 | return DEFER; | |
203 | }; | |
204 | ||
205 | /* now send the file */ | |
206 | do { | |
207 | j = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file); | |
208 | if (j > 0) { | |
209 | i = send(spamd_sock,spamd_buffer,j,0); | |
210 | if (i != j) { | |
211 | log_write(0, LOG_MAIN|LOG_PANIC, | |
212 | "spam acl condition: error/short send to spamd"); | |
213 | close(spamd_sock); | |
214 | fclose(mbox_file); | |
215 | return DEFER; | |
216 | }; | |
217 | }; | |
218 | } | |
219 | while (j > 0); | |
220 | ||
221 | fclose(mbox_file); | |
222 | ||
223 | /* we're done sending, close socket for writing */ | |
224 | shutdown(spamd_sock,SHUT_WR); | |
225 | ||
226 | /* read spamd response */ | |
227 | memset(spamd_buffer, 0, sizeof(spamd_buffer)); | |
228 | offset = 0; | |
229 | while((i = ip_recv(spamd_sock, | |
230 | spamd_buffer + offset, | |
231 | sizeof(spamd_buffer) - offset - 1, | |
232 | SPAMD_READ_TIMEOUT)) > 0 ) { | |
233 | offset += i; | |
234 | } | |
235 | ||
236 | /* error handling */ | |
237 | if((i <= 0) && (errno != 0)) { | |
238 | log_write(0, LOG_MAIN|LOG_PANIC, | |
239 | "spam acl condition: error reading from spamd socket: %s", strerror(errno)); | |
240 | close(spamd_sock); | |
241 | return DEFER; | |
242 | } | |
243 | ||
244 | /* reading done */ | |
245 | close(spamd_sock); | |
246 | ||
247 | /* dig in the spamd output and put the report in a multiline header, if requested */ | |
248 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n", | |
249 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
250 | ||
251 | /* try to fall back to pre-2.50 spamd output */ | |
252 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n", | |
253 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
254 | log_write(0, LOG_MAIN|LOG_PANIC, | |
255 | "spam acl condition: cannot parse spamd output"); | |
256 | return DEFER; | |
257 | }; | |
258 | }; | |
259 | ||
260 | /* Create report. Since this is a multiline string, | |
261 | we must hack it into shape first */ | |
262 | p = &spamd_buffer[spamd_report_offset]; | |
263 | q = spam_report_buffer; | |
264 | while (*p != '\0') { | |
265 | /* skip \r */ | |
266 | if (*p == '\r') { | |
267 | p++; | |
268 | continue; | |
269 | }; | |
270 | *q = *p; | |
271 | q++; | |
272 | if (*p == '\n') { | |
273 | *q = '\t'; | |
274 | q++; | |
275 | /* eat whitespace */ | |
276 | while( (*p <= ' ') && (*p != '\0') ) { | |
277 | p++; | |
278 | }; | |
279 | p--; | |
280 | }; | |
281 | p++; | |
282 | }; | |
283 | /* NULL-terminate */ | |
284 | *q = '\0'; | |
285 | q--; | |
286 | /* cut off trailing leftovers */ | |
287 | while (*q <= ' ') { | |
288 | *q = '\0'; | |
289 | q--; | |
290 | }; | |
291 | spam_report = spam_report_buffer; | |
292 | ||
293 | /* create spam bar */ | |
294 | spamd_score_char = spamd_score > 0 ? '+' : '-'; | |
295 | j = abs((int)(spamd_score)); | |
296 | i = 0; | |
297 | if( j != 0 ) { | |
298 | while((i < j) && (i <= MAX_SPAM_BAR_CHARS)) | |
299 | spam_bar_buffer[i++] = spamd_score_char; | |
300 | } | |
301 | else{ | |
302 | spam_bar_buffer[0] = '/'; | |
303 | i = 1; | |
304 | } | |
305 | spam_bar_buffer[i] = '\0'; | |
306 | spam_bar = spam_bar_buffer; | |
307 | ||
308 | /* create "float" spam score */ | |
309 | snprintf(CS spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score); | |
310 | spam_score = spam_score_buffer; | |
311 | ||
312 | /* create "int" spam score */ | |
313 | j = (int)((spamd_score + 0.001)*10); | |
314 | snprintf(CS spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j); | |
315 | spam_score_int = spam_score_int_buffer; | |
316 | ||
317 | /* compare threshold against score */ | |
318 | if (spamd_score >= spamd_threshold) { | |
319 | /* spam as determined by user's threshold */ | |
320 | spam_rc = OK; | |
321 | } | |
322 | else { | |
323 | /* not spam */ | |
324 | spam_rc = FAIL; | |
325 | }; | |
326 | ||
327 | /* remember user name and "been here" for it */ | |
328 | Ustrcpy(prev_user_name, user_name); | |
329 | spam_ok = 1; | |
330 | ||
331 | if (override) { | |
332 | /* always return OK, no matter what the score */ | |
333 | return OK; | |
334 | } | |
335 | else { | |
336 | return spam_rc; | |
337 | }; | |
338 | } | |
339 | ||
340 | #endif |