1 /* $Cambridge: exim/src/src/spam.c,v 1.5 2005/04/27 10:00:18 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 /* find the username from the option list */
46 if ((user_name
= string_nextinlist(&list
, &sep
,
48 sizeof(user_name_buffer
))) == NULL
) {
49 /* no username given, this means no scanning should be done */
53 /* if username is "0" or "false", do not scan */
54 if ( (Ustrcmp(user_name
,"0") == 0) ||
55 (strcmpic(user_name
,US
"false") == 0) ) {
59 /* if there is an additional option, check if it is "true" */
60 if (strcmpic(list
,US
"true") == 0) {
61 /* in that case, always return true later */
65 /* if we scanned for this username last time, just return */
66 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
73 /* make sure the eml mbox file is spooled up */
74 mbox_file
= spool_mbox(&mbox_size
);
76 if (mbox_file
== NULL
) {
77 /* error while spooling */
78 log_write(0, LOG_MAIN
|LOG_PANIC
,
79 "spam acl condition: error while creating mbox spool file");
84 /* socket does not start with '/' -> network socket */
85 if (*spamd_address
!= '/') {
86 time_t now
= time(NULL
);
88 int current_server
= 0;
90 uschar
*address
= NULL
;
91 uschar
*spamd_address_list_ptr
= spamd_address
;
92 uschar address_buffer
[256];
93 spamd_address_container
* spamd_address_vector
[32];
95 /* Check how many spamd servers we have
96 and register their addresses */
97 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
99 sizeof(address_buffer
))) != NULL
) {
101 spamd_address_container
*this_spamd
=
102 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
104 /* grok spamd address and port */
105 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
106 log_write(0, LOG_MAIN
,
107 "spam acl condition: warning - invalid spamd address: '%s'", address
);
111 spamd_address_vector
[num_servers
] = this_spamd
;
113 if (num_servers
> 31)
117 /* check if we have at least one server */
119 log_write(0, LOG_MAIN
|LOG_PANIC
,
120 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
125 current_server
= start_server
= (int)now
% num_servers
;
129 debug_printf("trying server %s, port %u\n",
130 spamd_address_vector
[current_server
]->tcp_addr
,
131 spamd_address_vector
[current_server
]->tcp_port
);
133 /* contact a spamd */
134 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
135 log_write(0, LOG_MAIN
|LOG_PANIC
,
136 "spam acl condition: error creating IP socket for spamd");
141 if (ip_connect( spamd_sock
,
143 spamd_address_vector
[current_server
]->tcp_addr
,
144 spamd_address_vector
[current_server
]->tcp_port
,
150 log_write(0, LOG_MAIN
|LOG_PANIC
,
151 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
152 spamd_address_vector
[current_server
]->tcp_addr
,
153 spamd_address_vector
[current_server
]->tcp_port
,
156 if (current_server
>= num_servers
)
158 if (current_server
== start_server
) {
159 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
168 /* open the local socket */
170 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
171 log_write(0, LOG_MAIN
|LOG_PANIC
,
172 "malware acl condition: spamd: unable to acquire socket (%s)",
178 server
.sun_family
= AF_UNIX
;
179 Ustrcpy(server
.sun_path
, spamd_address
);
181 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
182 log_write(0, LOG_MAIN
|LOG_PANIC
,
183 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
184 spamd_address
, strerror(errno
) );
192 /* now we are connected to spamd on spamd_sock */
193 snprintf(CS spamd_buffer
,
194 sizeof(spamd_buffer
),
195 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
199 /* send our request */
200 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
202 log_write(0, LOG_MAIN
|LOG_PANIC
,
203 "spam acl condition: spamd send failed: %s", strerror(errno
));
209 /* now send the file */
210 /* spamd sometimes accepts conections but doesn't read data off
211 * the connection. We make the file descriptor non-blocking so
212 * that the write will only write sufficient data without blocking
213 * and we poll the desciptor to make sure that we can write without
214 * blocking. Short writes are gracefully handled and if the whole
215 * trasaction takes too long it is aborted.
217 pollfd
.fd
= spamd_sock
;
218 pollfd
.events
= POLLOUT
;
219 fcntl(spamd_sock
, F_SETFL
, O_NONBLOCK
);
221 read
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
225 result
= poll(&pollfd
, 1, 1000);
226 if (result
== -1 && errno
== EINTR
)
228 else if (result
< 1) {
230 log_write(0, LOG_MAIN
|LOG_PANIC
,
231 "spam acl condition: %s on spamd socket", strerror(errno
));
233 if (time(NULL
) - start
< SPAMD_TIMEOUT
)
235 log_write(0, LOG_MAIN
|LOG_PANIC
,
236 "spam acl condition: timed out writing spamd socket");
242 wrote
= send(spamd_sock
,spamd_buffer
+ offset
,read
- offset
,0);
243 if (offset
+ wrote
!= read
) {
249 while (!feof(mbox_file
) && !ferror(mbox_file
));
250 if (ferror(mbox_file
)) {
251 log_write(0, LOG_MAIN
|LOG_PANIC
,
252 "spam acl condition: error reading spool file: %s", strerror(errno
));
260 /* we're done sending, close socket for writing */
261 shutdown(spamd_sock
,SHUT_WR
);
263 /* read spamd response using what's left of the timeout.
265 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
267 while((i
= ip_recv(spamd_sock
,
268 spamd_buffer
+ offset
,
269 sizeof(spamd_buffer
) - offset
- 1,
270 SPAMD_TIMEOUT
- time(NULL
) + start
)) > 0 ) {
275 if((i
<= 0) && (errno
!= 0)) {
276 log_write(0, LOG_MAIN
|LOG_PANIC
,
277 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
285 /* dig in the spamd output and put the report in a multiline header, if requested */
286 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
287 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
289 /* try to fall back to pre-2.50 spamd output */
290 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
291 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
292 log_write(0, LOG_MAIN
|LOG_PANIC
,
293 "spam acl condition: cannot parse spamd output");
298 /* Create report. Since this is a multiline string,
299 we must hack it into shape first */
300 p
= &spamd_buffer
[spamd_report_offset
];
301 q
= spam_report_buffer
;
314 while( (*p
<= ' ') && (*p
!= '\0') ) {
324 /* cut off trailing leftovers */
329 spam_report
= spam_report_buffer
;
331 /* create spam bar */
332 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
333 j
= abs((int)(spamd_score
));
336 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
337 spam_bar_buffer
[i
++] = spamd_score_char
;
340 spam_bar_buffer
[0] = '/';
343 spam_bar_buffer
[i
] = '\0';
344 spam_bar
= spam_bar_buffer
;
346 /* create "float" spam score */
347 snprintf(CS spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
348 spam_score
= spam_score_buffer
;
350 /* create "int" spam score */
351 j
= (int)((spamd_score
+ 0.001)*10);
352 snprintf(CS spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
353 spam_score_int
= spam_score_int_buffer
;
355 /* compare threshold against score */
356 if (spamd_score
>= spamd_threshold
) {
357 /* spam as determined by user's threshold */
365 /* remember user name and "been here" for it */
366 Ustrcpy(prev_user_name
, user_name
);
370 /* always return OK, no matter what the score */