1 /* $Cambridge: exim/src/src/spam.c,v 1.18 2010/06/05 11:13:30 pdp Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
10 /* Code for calling spamassassin's spamd. Called from acl.c. */
13 #ifdef WITH_CONTENT_SCAN
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] = "";
23 uschar
*prev_spamd_address_work
= NULL
;
25 int spam(uschar
**listptr
) {
27 uschar
*list
= *listptr
;
29 uschar user_name_buffer
[128];
30 unsigned long mbox_size
;
33 uschar spamd_buffer
[32600];
34 int i
, j
, offset
, result
;
35 uschar spamd_version
[8];
36 uschar spamd_score_char
;
37 double spamd_threshold
, spamd_score
;
38 int spamd_report_offset
;
43 struct sockaddr_un server
;
46 #else /* Patch posted by Erik ? for OS X */
47 struct timeval select_tv
; /* and applied by PH */
50 uschar
*spamd_address_work
;
52 /* stop compiler warning */
55 /* find the username from the option list */
56 if ((user_name
= string_nextinlist(&list
, &sep
,
58 sizeof(user_name_buffer
))) == NULL
) {
59 /* no username given, this means no scanning should be done */
63 /* if username is "0" or "false", do not scan */
64 if ( (Ustrcmp(user_name
,"0") == 0) ||
65 (strcmpic(user_name
,US
"false") == 0) ) {
69 /* if there is an additional option, check if it is "true" */
70 if (strcmpic(list
,US
"true") == 0) {
71 /* in that case, always return true later */
75 /* expand spamd_address if needed */
76 if (*spamd_address
== '$') {
77 spamd_address_work
= expand_string(spamd_address
);
78 if (spamd_address_work
== NULL
) {
79 log_write(0, LOG_MAIN
|LOG_PANIC
,
80 "spamassassin acl condition: spamd_address starts with $, but expansion failed: %s", expand_string_message
);
85 spamd_address_work
= spamd_address
;
87 /* check if previous spamd_address was expanded and has changed. dump cached results if so */
88 if ( spam_ok
&& ( prev_spamd_address_work
!= NULL
) && (Ustrcmp(prev_spamd_address_work
, spamd_address_work
) != 0)) {
92 /* if we scanned for this username last time, just return */
93 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
100 /* make sure the eml mbox file is spooled up */
101 mbox_file
= spool_mbox(&mbox_size
, NULL
);
103 if (mbox_file
== NULL
) {
104 /* error while spooling */
105 log_write(0, LOG_MAIN
|LOG_PANIC
,
106 "spam acl condition: error while creating mbox spool file");
112 /* socket does not start with '/' -> network socket */
113 if (*spamd_address_work
!= '/') {
116 uschar
*address
= NULL
;
117 uschar
*spamd_address_list_ptr
= spamd_address_work
;
118 uschar address_buffer
[256];
119 spamd_address_container
* spamd_address_vector
[32];
121 /* Check how many spamd servers we have
122 and register their addresses */
123 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
125 sizeof(address_buffer
))) != NULL
) {
127 /* Potential memory leak as we never free the store. */
128 spamd_address_container
*this_spamd
=
129 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
131 /* grok spamd address and port */
132 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
133 log_write(0, LOG_MAIN
,
134 "spam acl condition: warning - invalid spamd address: '%s'", address
);
138 spamd_address_vector
[num_servers
] = this_spamd
;
140 if (num_servers
> 31)
144 /* check if we have at least one server */
146 log_write(0, LOG_MAIN
|LOG_PANIC
,
147 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
148 (void)fclose(mbox_file
);
152 while ( num_servers
> 0 ) {
154 /* Randomly pick a server to try */
155 current_server
= random_number( num_servers
);
157 debug_printf("trying server %s, port %u\n",
158 spamd_address_vector
[current_server
]->tcp_addr
,
159 spamd_address_vector
[current_server
]->tcp_port
);
161 /* contact a spamd */
162 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
163 log_write(0, LOG_MAIN
|LOG_PANIC
,
164 "spam acl condition: error creating IP socket for spamd");
165 (void)fclose(mbox_file
);
169 if (ip_connect( spamd_sock
,
171 spamd_address_vector
[current_server
]->tcp_addr
,
172 spamd_address_vector
[current_server
]->tcp_port
,
178 log_write(0, LOG_MAIN
|LOG_PANIC
,
179 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
180 spamd_address_vector
[current_server
]->tcp_addr
,
181 spamd_address_vector
[current_server
]->tcp_port
,
184 (void)close(spamd_sock
);
186 /* Remove the server from the list. XXX We should free the memory */
189 for( i
= current_server
; i
< num_servers
; i
++ )
190 spamd_address_vector
[i
] = spamd_address_vector
[i
+1];
193 if ( num_servers
== 0 ) {
194 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
195 (void)fclose(mbox_file
);
201 /* open the local socket */
203 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
204 log_write(0, LOG_MAIN
|LOG_PANIC
,
205 "malware acl condition: spamd: unable to acquire socket (%s)",
207 (void)fclose(mbox_file
);
211 server
.sun_family
= AF_UNIX
;
212 Ustrcpy(server
.sun_path
, spamd_address_work
);
214 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
215 log_write(0, LOG_MAIN
|LOG_PANIC
,
216 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
217 spamd_address_work
, strerror(errno
) );
218 (void)fclose(mbox_file
);
219 (void)close(spamd_sock
);
225 /* now we are connected to spamd on spamd_sock */
226 (void)string_format(spamd_buffer
,
227 sizeof(spamd_buffer
),
228 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
232 /* send our request */
233 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
234 (void)close(spamd_sock
);
235 log_write(0, LOG_MAIN
|LOG_PANIC
,
236 "spam acl condition: spamd send failed: %s", strerror(errno
));
237 (void)fclose(mbox_file
);
238 (void)close(spamd_sock
);
242 /* now send the file */
243 /* spamd sometimes accepts conections but doesn't read data off
244 * the connection. We make the file descriptor non-blocking so
245 * that the write will only write sufficient data without blocking
246 * and we poll the desciptor to make sure that we can write without
247 * blocking. Short writes are gracefully handled and if the whole
248 * trasaction takes too long it is aborted.
249 * Note: poll() is not supported in OSX 10.2 and is reported to be
250 * broken in more recent versions (up to 10.4).
253 pollfd
.fd
= spamd_sock
;
254 pollfd
.events
= POLLOUT
;
256 (void)fcntl(spamd_sock
, F_SETFL
, O_NONBLOCK
);
258 read
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
263 result
= poll(&pollfd
, 1, 1000);
265 /* Patch posted by Erik ? for OS X and applied by PH */
267 select_tv
.tv_sec
= 1;
268 select_tv
.tv_usec
= 0;
270 FD_SET(spamd_sock
, &select_fd
);
271 result
= select(spamd_sock
+1, NULL
, &select_fd
, NULL
, &select_tv
);
273 /* End Erik's patch */
275 if (result
== -1 && errno
== EINTR
)
277 else if (result
< 1) {
279 log_write(0, LOG_MAIN
|LOG_PANIC
,
280 "spam acl condition: %s on spamd socket", strerror(errno
));
282 if (time(NULL
) - start
< SPAMD_TIMEOUT
)
284 log_write(0, LOG_MAIN
|LOG_PANIC
,
285 "spam acl condition: timed out writing spamd socket");
287 (void)close(spamd_sock
);
288 (void)fclose(mbox_file
);
292 wrote
= send(spamd_sock
,spamd_buffer
+ offset
,read
- offset
,0);
295 log_write(0, LOG_MAIN
|LOG_PANIC
,
296 "spam acl condition: %s on spamd socket", strerror(errno
));
297 (void)close(spamd_sock
);
298 (void)fclose(mbox_file
);
301 if (offset
+ wrote
!= read
) {
307 while (!feof(mbox_file
) && !ferror(mbox_file
));
308 if (ferror(mbox_file
)) {
309 log_write(0, LOG_MAIN
|LOG_PANIC
,
310 "spam acl condition: error reading spool file: %s", strerror(errno
));
311 (void)close(spamd_sock
);
312 (void)fclose(mbox_file
);
316 (void)fclose(mbox_file
);
318 /* we're done sending, close socket for writing */
319 shutdown(spamd_sock
,SHUT_WR
);
321 /* read spamd response using what's left of the timeout.
323 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
325 while((i
= ip_recv(spamd_sock
,
326 spamd_buffer
+ offset
,
327 sizeof(spamd_buffer
) - offset
- 1,
328 SPAMD_TIMEOUT
- time(NULL
) + start
)) > 0 ) {
333 if((i
<= 0) && (errno
!= 0)) {
334 log_write(0, LOG_MAIN
|LOG_PANIC
,
335 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
336 (void)close(spamd_sock
);
341 (void)close(spamd_sock
);
343 /* dig in the spamd output and put the report in a multiline header, if requested */
344 if( sscanf(CS spamd_buffer
,"SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
345 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
347 /* try to fall back to pre-2.50 spamd output */
348 if( sscanf(CS spamd_buffer
,"SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
349 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
350 log_write(0, LOG_MAIN
|LOG_PANIC
,
351 "spam acl condition: cannot parse spamd output");
356 /* Create report. Since this is a multiline string,
357 we must hack it into shape first */
358 p
= &spamd_buffer
[spamd_report_offset
];
359 q
= spam_report_buffer
;
369 /* add an extra space after the newline to ensure
370 that it is treated as a header continuation line */
379 /* cut off trailing leftovers */
384 spam_report
= spam_report_buffer
;
386 /* create spam bar */
387 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
388 j
= abs((int)(spamd_score
));
391 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
392 spam_bar_buffer
[i
++] = spamd_score_char
;
395 spam_bar_buffer
[0] = '/';
398 spam_bar_buffer
[i
] = '\0';
399 spam_bar
= spam_bar_buffer
;
401 /* create "float" spam score */
402 (void)string_format(spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
403 spam_score
= spam_score_buffer
;
405 /* create "int" spam score */
406 j
= (int)((spamd_score
+ 0.001)*10);
407 (void)string_format(spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
408 spam_score_int
= spam_score_int_buffer
;
410 /* compare threshold against score */
411 if (spamd_score
>= spamd_threshold
) {
412 /* spam as determined by user's threshold */
420 /* remember expanded spamd_address if needed */
421 if (spamd_address_work
!= spamd_address
) {
422 prev_spamd_address_work
= string_copy(spamd_address_work
);
424 /* remember user name and "been here" for it */
425 Ustrcpy(prev_user_name
, user_name
);
429 /* always return OK, no matter what the score */