1 /* $Cambridge: exim/src/src/spam.c,v 1.15 2008/01/16 09:52:15 tom 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] = "";
24 int spam(uschar
**listptr
) {
26 uschar
*list
= *listptr
;
28 uschar user_name_buffer
[128];
29 unsigned long mbox_size
;
32 uschar spamd_buffer
[32600];
33 int i
, j
, offset
, result
;
34 uschar spamd_version
[8];
35 uschar spamd_score_char
;
36 double spamd_threshold
, spamd_score
;
37 int spamd_report_offset
;
42 struct sockaddr_un server
;
45 #else /* Patch posted by Erik ? for OS X */
46 struct timeval select_tv
; /* and applied by PH */
49 uschar
*spamd_address_work
;
51 /* stop compiler warning */
54 /* find the username from the option list */
55 if ((user_name
= string_nextinlist(&list
, &sep
,
57 sizeof(user_name_buffer
))) == NULL
) {
58 /* no username given, this means no scanning should be done */
62 /* if username is "0" or "false", do not scan */
63 if ( (Ustrcmp(user_name
,"0") == 0) ||
64 (strcmpic(user_name
,US
"false") == 0) ) {
68 /* if there is an additional option, check if it is "true" */
69 if (strcmpic(list
,US
"true") == 0) {
70 /* in that case, always return true later */
74 /* if we scanned for this username last time, just return */
75 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
82 /* make sure the eml mbox file is spooled up */
83 mbox_file
= spool_mbox(&mbox_size
);
85 if (mbox_file
== NULL
) {
86 /* error while spooling */
87 log_write(0, LOG_MAIN
|LOG_PANIC
,
88 "spam acl condition: error while creating mbox spool file");
94 if (*spamd_address
== '$') {
95 spamd_address_work
= expand_string(spamd_address
);
96 if (spamd_address_work
== NULL
) {
97 log_write(0, LOG_MAIN
|LOG_PANIC
,
98 "spamassassin acl condition: spamd_address starts with $, but expansion failed: %s", expand_string_message
);
103 spamd_address_work
= spamd_address
;
105 /* socket does not start with '/' -> network socket */
106 if (*spamd_address_work
!= '/') {
107 time_t now
= time(NULL
);
109 int current_server
= 0;
110 int start_server
= 0;
111 uschar
*address
= NULL
;
112 uschar
*spamd_address_list_ptr
= spamd_address
;
113 uschar address_buffer
[256];
114 spamd_address_container
* spamd_address_vector
[32];
116 /* Check how many spamd servers we have
117 and register their addresses */
118 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
120 sizeof(address_buffer
))) != NULL
) {
122 spamd_address_container
*this_spamd
=
123 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
125 /* grok spamd address and port */
126 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
127 log_write(0, LOG_MAIN
,
128 "spam acl condition: warning - invalid spamd address: '%s'", address
);
132 spamd_address_vector
[num_servers
] = this_spamd
;
134 if (num_servers
> 31)
138 /* check if we have at least one server */
140 log_write(0, LOG_MAIN
|LOG_PANIC
,
141 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
142 (void)fclose(mbox_file
);
146 current_server
= start_server
= (int)now
% num_servers
;
150 debug_printf("trying server %s, port %u\n",
151 spamd_address_vector
[current_server
]->tcp_addr
,
152 spamd_address_vector
[current_server
]->tcp_port
);
154 /* contact a spamd */
155 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
156 log_write(0, LOG_MAIN
|LOG_PANIC
,
157 "spam acl condition: error creating IP socket for spamd");
158 (void)fclose(mbox_file
);
162 if (ip_connect( spamd_sock
,
164 spamd_address_vector
[current_server
]->tcp_addr
,
165 spamd_address_vector
[current_server
]->tcp_port
,
171 log_write(0, LOG_MAIN
|LOG_PANIC
,
172 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
173 spamd_address_vector
[current_server
]->tcp_addr
,
174 spamd_address_vector
[current_server
]->tcp_port
,
177 if (current_server
>= num_servers
)
179 if (current_server
== start_server
) {
180 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
181 (void)fclose(mbox_file
);
182 (void)close(spamd_sock
);
189 /* open the local socket */
191 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
192 log_write(0, LOG_MAIN
|LOG_PANIC
,
193 "malware acl condition: spamd: unable to acquire socket (%s)",
195 (void)fclose(mbox_file
);
199 server
.sun_family
= AF_UNIX
;
200 Ustrcpy(server
.sun_path
, spamd_address_work
);
202 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
203 log_write(0, LOG_MAIN
|LOG_PANIC
,
204 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
205 spamd_address_work
, strerror(errno
) );
206 (void)fclose(mbox_file
);
207 (void)close(spamd_sock
);
213 /* now we are connected to spamd on spamd_sock */
214 (void)string_format(spamd_buffer
,
215 sizeof(spamd_buffer
),
216 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
220 /* send our request */
221 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
222 (void)close(spamd_sock
);
223 log_write(0, LOG_MAIN
|LOG_PANIC
,
224 "spam acl condition: spamd send failed: %s", strerror(errno
));
225 (void)fclose(mbox_file
);
226 (void)close(spamd_sock
);
230 /* now send the file */
231 /* spamd sometimes accepts conections but doesn't read data off
232 * the connection. We make the file descriptor non-blocking so
233 * that the write will only write sufficient data without blocking
234 * and we poll the desciptor to make sure that we can write without
235 * blocking. Short writes are gracefully handled and if the whole
236 * trasaction takes too long it is aborted.
237 * Note: poll() is not supported in OSX 10.2 and is reported to be
238 * broken in more recent versions (up to 10.4).
241 pollfd
.fd
= spamd_sock
;
242 pollfd
.events
= POLLOUT
;
244 (void)fcntl(spamd_sock
, F_SETFL
, O_NONBLOCK
);
246 read
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
251 result
= poll(&pollfd
, 1, 1000);
253 /* Patch posted by Erik ? for OS X and applied by PH */
255 select_tv
.tv_sec
= 1;
256 select_tv
.tv_usec
= 0;
258 FD_SET(spamd_sock
, &select_fd
);
259 result
= select(spamd_sock
+1, NULL
, &select_fd
, NULL
, &select_tv
);
261 /* End Erik's patch */
263 if (result
== -1 && errno
== EINTR
)
265 else if (result
< 1) {
267 log_write(0, LOG_MAIN
|LOG_PANIC
,
268 "spam acl condition: %s on spamd socket", strerror(errno
));
270 if (time(NULL
) - start
< SPAMD_TIMEOUT
)
272 log_write(0, LOG_MAIN
|LOG_PANIC
,
273 "spam acl condition: timed out writing spamd socket");
275 (void)close(spamd_sock
);
276 (void)fclose(mbox_file
);
280 wrote
= send(spamd_sock
,spamd_buffer
+ offset
,read
- offset
,0);
283 log_write(0, LOG_MAIN
|LOG_PANIC
,
284 "spam acl condition: %s on spamd socket", strerror(errno
));
285 (void)close(spamd_sock
);
286 (void)fclose(mbox_file
);
289 if (offset
+ wrote
!= read
) {
295 while (!feof(mbox_file
) && !ferror(mbox_file
));
296 if (ferror(mbox_file
)) {
297 log_write(0, LOG_MAIN
|LOG_PANIC
,
298 "spam acl condition: error reading spool file: %s", strerror(errno
));
299 (void)close(spamd_sock
);
300 (void)fclose(mbox_file
);
304 (void)fclose(mbox_file
);
306 /* we're done sending, close socket for writing */
307 shutdown(spamd_sock
,SHUT_WR
);
309 /* read spamd response using what's left of the timeout.
311 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
313 while((i
= ip_recv(spamd_sock
,
314 spamd_buffer
+ offset
,
315 sizeof(spamd_buffer
) - offset
- 1,
316 SPAMD_TIMEOUT
- time(NULL
) + start
)) > 0 ) {
321 if((i
<= 0) && (errno
!= 0)) {
322 log_write(0, LOG_MAIN
|LOG_PANIC
,
323 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
324 (void)close(spamd_sock
);
329 (void)close(spamd_sock
);
331 /* dig in the spamd output and put the report in a multiline header, if requested */
332 if( sscanf(CS spamd_buffer
,"SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
333 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
335 /* try to fall back to pre-2.50 spamd output */
336 if( sscanf(CS spamd_buffer
,"SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
337 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
338 log_write(0, LOG_MAIN
|LOG_PANIC
,
339 "spam acl condition: cannot parse spamd output");
344 /* Create report. Since this is a multiline string,
345 we must hack it into shape first */
346 p
= &spamd_buffer
[spamd_report_offset
];
347 q
= spam_report_buffer
;
360 while( (*p
<= ' ') && (*p
!= '\0') ) {
370 /* cut off trailing leftovers */
375 spam_report
= spam_report_buffer
;
377 /* create spam bar */
378 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
379 j
= abs((int)(spamd_score
));
382 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
383 spam_bar_buffer
[i
++] = spamd_score_char
;
386 spam_bar_buffer
[0] = '/';
389 spam_bar_buffer
[i
] = '\0';
390 spam_bar
= spam_bar_buffer
;
392 /* create "float" spam score */
393 (void)string_format(spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
394 spam_score
= spam_score_buffer
;
396 /* create "int" spam score */
397 j
= (int)((spamd_score
+ 0.001)*10);
398 (void)string_format(spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
399 spam_score_int
= spam_score_int_buffer
;
401 /* compare threshold against score */
402 if (spamd_score
>= spamd_threshold
) {
403 /* spam as determined by user's threshold */
411 /* remember user name and "been here" for it unless spamd_socket was expanded */
412 if (spamd_address_work
== spamd_address
) {
413 Ustrcpy(prev_user_name
, user_name
);
418 /* always return OK, no matter what the score */