1 /* $Cambridge: exim/src/src/spam.c,v 1.13 2006/09/05 14:05:43 ph10 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 */
50 /* stop compiler warning */
53 /* find the username from the option list */
54 if ((user_name
= string_nextinlist(&list
, &sep
,
56 sizeof(user_name_buffer
))) == NULL
) {
57 /* no username given, this means no scanning should be done */
61 /* if username is "0" or "false", do not scan */
62 if ( (Ustrcmp(user_name
,"0") == 0) ||
63 (strcmpic(user_name
,US
"false") == 0) ) {
67 /* if there is an additional option, check if it is "true" */
68 if (strcmpic(list
,US
"true") == 0) {
69 /* in that case, always return true later */
73 /* if we scanned for this username last time, just return */
74 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
81 /* make sure the eml mbox file is spooled up */
82 mbox_file
= spool_mbox(&mbox_size
);
84 if (mbox_file
== NULL
) {
85 /* error while spooling */
86 log_write(0, LOG_MAIN
|LOG_PANIC
,
87 "spam acl condition: error while creating mbox spool file");
92 /* socket does not start with '/' -> network socket */
93 if (*spamd_address
!= '/') {
94 time_t now
= time(NULL
);
96 int current_server
= 0;
98 uschar
*address
= NULL
;
99 uschar
*spamd_address_list_ptr
= spamd_address
;
100 uschar address_buffer
[256];
101 spamd_address_container
* spamd_address_vector
[32];
103 /* Check how many spamd servers we have
104 and register their addresses */
105 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
107 sizeof(address_buffer
))) != NULL
) {
109 spamd_address_container
*this_spamd
=
110 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
112 /* grok spamd address and port */
113 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
114 log_write(0, LOG_MAIN
,
115 "spam acl condition: warning - invalid spamd address: '%s'", address
);
119 spamd_address_vector
[num_servers
] = this_spamd
;
121 if (num_servers
> 31)
125 /* check if we have at least one server */
127 log_write(0, LOG_MAIN
|LOG_PANIC
,
128 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
129 (void)fclose(mbox_file
);
133 current_server
= start_server
= (int)now
% num_servers
;
137 debug_printf("trying server %s, port %u\n",
138 spamd_address_vector
[current_server
]->tcp_addr
,
139 spamd_address_vector
[current_server
]->tcp_port
);
141 /* contact a spamd */
142 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
143 log_write(0, LOG_MAIN
|LOG_PANIC
,
144 "spam acl condition: error creating IP socket for spamd");
145 (void)fclose(mbox_file
);
149 if (ip_connect( spamd_sock
,
151 spamd_address_vector
[current_server
]->tcp_addr
,
152 spamd_address_vector
[current_server
]->tcp_port
,
158 log_write(0, LOG_MAIN
|LOG_PANIC
,
159 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
160 spamd_address_vector
[current_server
]->tcp_addr
,
161 spamd_address_vector
[current_server
]->tcp_port
,
164 if (current_server
>= num_servers
)
166 if (current_server
== start_server
) {
167 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
168 (void)fclose(mbox_file
);
169 (void)close(spamd_sock
);
176 /* open the local socket */
178 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
179 log_write(0, LOG_MAIN
|LOG_PANIC
,
180 "malware acl condition: spamd: unable to acquire socket (%s)",
182 (void)fclose(mbox_file
);
186 server
.sun_family
= AF_UNIX
;
187 Ustrcpy(server
.sun_path
, spamd_address
);
189 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
190 log_write(0, LOG_MAIN
|LOG_PANIC
,
191 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
192 spamd_address
, strerror(errno
) );
193 (void)fclose(mbox_file
);
194 (void)close(spamd_sock
);
200 /* now we are connected to spamd on spamd_sock */
201 (void)string_format(spamd_buffer
,
202 sizeof(spamd_buffer
),
203 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
207 /* send our request */
208 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
209 (void)close(spamd_sock
);
210 log_write(0, LOG_MAIN
|LOG_PANIC
,
211 "spam acl condition: spamd send failed: %s", strerror(errno
));
212 (void)fclose(mbox_file
);
213 (void)close(spamd_sock
);
217 /* now send the file */
218 /* spamd sometimes accepts conections but doesn't read data off
219 * the connection. We make the file descriptor non-blocking so
220 * that the write will only write sufficient data without blocking
221 * and we poll the desciptor to make sure that we can write without
222 * blocking. Short writes are gracefully handled and if the whole
223 * trasaction takes too long it is aborted.
224 * Note: poll() is not supported in OSX 10.2 and is reported to be
225 * broken in more recent versions (up to 10.4).
228 pollfd
.fd
= spamd_sock
;
229 pollfd
.events
= POLLOUT
;
231 (void)fcntl(spamd_sock
, F_SETFL
, O_NONBLOCK
);
233 read
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
238 result
= poll(&pollfd
, 1, 1000);
240 /* Patch posted by Erik ? for OS X and applied by PH */
242 select_tv
.tv_sec
= 1;
243 select_tv
.tv_usec
= 0;
245 FD_SET(spamd_sock
, &select_fd
);
246 result
= select(spamd_sock
+1, NULL
, &select_fd
, NULL
, &select_tv
);
248 /* End Erik's patch */
250 if (result
== -1 && errno
== EINTR
)
252 else if (result
< 1) {
254 log_write(0, LOG_MAIN
|LOG_PANIC
,
255 "spam acl condition: %s on spamd socket", strerror(errno
));
257 if (time(NULL
) - start
< SPAMD_TIMEOUT
)
259 log_write(0, LOG_MAIN
|LOG_PANIC
,
260 "spam acl condition: timed out writing spamd socket");
262 (void)close(spamd_sock
);
263 (void)fclose(mbox_file
);
267 wrote
= send(spamd_sock
,spamd_buffer
+ offset
,read
- offset
,0);
270 log_write(0, LOG_MAIN
|LOG_PANIC
,
271 "spam acl condition: %s on spamd socket", strerror(errno
));
272 (void)close(spamd_sock
);
273 (void)fclose(mbox_file
);
276 if (offset
+ wrote
!= read
) {
282 while (!feof(mbox_file
) && !ferror(mbox_file
));
283 if (ferror(mbox_file
)) {
284 log_write(0, LOG_MAIN
|LOG_PANIC
,
285 "spam acl condition: error reading spool file: %s", strerror(errno
));
286 (void)close(spamd_sock
);
287 (void)fclose(mbox_file
);
291 (void)fclose(mbox_file
);
293 /* we're done sending, close socket for writing */
294 shutdown(spamd_sock
,SHUT_WR
);
296 /* read spamd response using what's left of the timeout.
298 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
300 while((i
= ip_recv(spamd_sock
,
301 spamd_buffer
+ offset
,
302 sizeof(spamd_buffer
) - offset
- 1,
303 SPAMD_TIMEOUT
- time(NULL
) + start
)) > 0 ) {
308 if((i
<= 0) && (errno
!= 0)) {
309 log_write(0, LOG_MAIN
|LOG_PANIC
,
310 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
311 (void)close(spamd_sock
);
316 (void)close(spamd_sock
);
318 /* dig in the spamd output and put the report in a multiline header, if requested */
319 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
320 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
322 /* try to fall back to pre-2.50 spamd output */
323 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
324 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
325 log_write(0, LOG_MAIN
|LOG_PANIC
,
326 "spam acl condition: cannot parse spamd output");
331 /* Create report. Since this is a multiline string,
332 we must hack it into shape first */
333 p
= &spamd_buffer
[spamd_report_offset
];
334 q
= spam_report_buffer
;
347 while( (*p
<= ' ') && (*p
!= '\0') ) {
357 /* cut off trailing leftovers */
362 spam_report
= spam_report_buffer
;
364 /* create spam bar */
365 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
366 j
= abs((int)(spamd_score
));
369 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
370 spam_bar_buffer
[i
++] = spamd_score_char
;
373 spam_bar_buffer
[0] = '/';
376 spam_bar_buffer
[i
] = '\0';
377 spam_bar
= spam_bar_buffer
;
379 /* create "float" spam score */
380 (void)string_format(spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
381 spam_score
= spam_score_buffer
;
383 /* create "int" spam score */
384 j
= (int)((spamd_score
+ 0.001)*10);
385 (void)string_format(spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
386 spam_score_int
= spam_score_int_buffer
;
388 /* compare threshold against score */
389 if (spamd_score
>= spamd_threshold
) {
390 /* spam as determined by user's threshold */
398 /* remember user name and "been here" for it */
399 Ustrcpy(prev_user_name
, user_name
);
403 /* always return OK, no matter what the score */