1 /* $Cambridge: exim/src/src/spam.c,v 1.7 2005/06/10 13:29:36 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
;
47 /* find the username from the option list */
48 if ((user_name
= string_nextinlist(&list
, &sep
,
50 sizeof(user_name_buffer
))) == NULL
) {
51 /* no username given, this means no scanning should be done */
55 /* if username is "0" or "false", do not scan */
56 if ( (Ustrcmp(user_name
,"0") == 0) ||
57 (strcmpic(user_name
,US
"false") == 0) ) {
61 /* if there is an additional option, check if it is "true" */
62 if (strcmpic(list
,US
"true") == 0) {
63 /* in that case, always return true later */
67 /* if we scanned for this username last time, just return */
68 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
75 /* make sure the eml mbox file is spooled up */
76 mbox_file
= spool_mbox(&mbox_size
);
78 if (mbox_file
== NULL
) {
79 /* error while spooling */
80 log_write(0, LOG_MAIN
|LOG_PANIC
,
81 "spam acl condition: error while creating mbox spool file");
86 /* socket does not start with '/' -> network socket */
87 if (*spamd_address
!= '/') {
88 time_t now
= time(NULL
);
90 int current_server
= 0;
92 uschar
*address
= NULL
;
93 uschar
*spamd_address_list_ptr
= spamd_address
;
94 uschar address_buffer
[256];
95 spamd_address_container
* spamd_address_vector
[32];
97 /* Check how many spamd servers we have
98 and register their addresses */
99 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
101 sizeof(address_buffer
))) != NULL
) {
103 spamd_address_container
*this_spamd
=
104 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
106 /* grok spamd address and port */
107 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
108 log_write(0, LOG_MAIN
,
109 "spam acl condition: warning - invalid spamd address: '%s'", address
);
113 spamd_address_vector
[num_servers
] = this_spamd
;
115 if (num_servers
> 31)
119 /* check if we have at least one server */
121 log_write(0, LOG_MAIN
|LOG_PANIC
,
122 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
127 current_server
= start_server
= (int)now
% num_servers
;
131 debug_printf("trying server %s, port %u\n",
132 spamd_address_vector
[current_server
]->tcp_addr
,
133 spamd_address_vector
[current_server
]->tcp_port
);
135 /* contact a spamd */
136 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
137 log_write(0, LOG_MAIN
|LOG_PANIC
,
138 "spam acl condition: error creating IP socket for spamd");
143 if (ip_connect( spamd_sock
,
145 spamd_address_vector
[current_server
]->tcp_addr
,
146 spamd_address_vector
[current_server
]->tcp_port
,
152 log_write(0, LOG_MAIN
|LOG_PANIC
,
153 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
154 spamd_address_vector
[current_server
]->tcp_addr
,
155 spamd_address_vector
[current_server
]->tcp_port
,
158 if (current_server
>= num_servers
)
160 if (current_server
== start_server
) {
161 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
170 /* open the local socket */
172 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
173 log_write(0, LOG_MAIN
|LOG_PANIC
,
174 "malware acl condition: spamd: unable to acquire socket (%s)",
180 server
.sun_family
= AF_UNIX
;
181 Ustrcpy(server
.sun_path
, spamd_address
);
183 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
184 log_write(0, LOG_MAIN
|LOG_PANIC
,
185 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
186 spamd_address
, strerror(errno
) );
194 /* now we are connected to spamd on spamd_sock */
195 snprintf(CS spamd_buffer
,
196 sizeof(spamd_buffer
),
197 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
201 /* send our request */
202 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
204 log_write(0, LOG_MAIN
|LOG_PANIC
,
205 "spam acl condition: spamd send failed: %s", strerror(errno
));
211 /* now send the file */
212 /* spamd sometimes accepts conections but doesn't read data off
213 * the connection. We make the file descriptor non-blocking so
214 * that the write will only write sufficient data without blocking
215 * and we poll the desciptor to make sure that we can write without
216 * blocking. Short writes are gracefully handled and if the whole
217 * trasaction takes too long it is aborted.
218 * Note: poll() is not supported in OSX 10.2.
221 pollfd
.fd
= spamd_sock
;
222 pollfd
.events
= POLLOUT
;
224 fcntl(spamd_sock
, F_SETFL
, O_NONBLOCK
);
226 read
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
231 result
= poll(&pollfd
, 1, 1000);
232 if (result
== -1 && errno
== EINTR
)
234 else if (result
< 1) {
236 log_write(0, LOG_MAIN
|LOG_PANIC
,
237 "spam acl condition: %s on spamd socket", strerror(errno
));
239 if (time(NULL
) - start
< SPAMD_TIMEOUT
)
241 log_write(0, LOG_MAIN
|LOG_PANIC
,
242 "spam acl condition: timed out writing spamd socket");
249 wrote
= send(spamd_sock
,spamd_buffer
+ offset
,read
- offset
,0);
252 log_write(0, LOG_MAIN
|LOG_PANIC
,
253 "spam acl condition: %s on spamd socket", strerror(errno
));
258 if (offset
+ wrote
!= read
) {
264 while (!feof(mbox_file
) && !ferror(mbox_file
));
265 if (ferror(mbox_file
)) {
266 log_write(0, LOG_MAIN
|LOG_PANIC
,
267 "spam acl condition: error reading spool file: %s", strerror(errno
));
275 /* we're done sending, close socket for writing */
276 shutdown(spamd_sock
,SHUT_WR
);
278 /* read spamd response using what's left of the timeout.
280 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
282 while((i
= ip_recv(spamd_sock
,
283 spamd_buffer
+ offset
,
284 sizeof(spamd_buffer
) - offset
- 1,
285 SPAMD_TIMEOUT
- time(NULL
) + start
)) > 0 ) {
290 if((i
<= 0) && (errno
!= 0)) {
291 log_write(0, LOG_MAIN
|LOG_PANIC
,
292 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
300 /* dig in the spamd output and put the report in a multiline header, if requested */
301 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
302 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
304 /* try to fall back to pre-2.50 spamd output */
305 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
306 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
307 log_write(0, LOG_MAIN
|LOG_PANIC
,
308 "spam acl condition: cannot parse spamd output");
313 /* Create report. Since this is a multiline string,
314 we must hack it into shape first */
315 p
= &spamd_buffer
[spamd_report_offset
];
316 q
= spam_report_buffer
;
329 while( (*p
<= ' ') && (*p
!= '\0') ) {
339 /* cut off trailing leftovers */
344 spam_report
= spam_report_buffer
;
346 /* create spam bar */
347 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
348 j
= abs((int)(spamd_score
));
351 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
352 spam_bar_buffer
[i
++] = spamd_score_char
;
355 spam_bar_buffer
[0] = '/';
358 spam_bar_buffer
[i
] = '\0';
359 spam_bar
= spam_bar_buffer
;
361 /* create "float" spam score */
362 snprintf(CS spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
363 spam_score
= spam_score_buffer
;
365 /* create "int" spam score */
366 j
= (int)((spamd_score
+ 0.001)*10);
367 snprintf(CS spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
368 spam_score_int
= spam_score_int_buffer
;
370 /* compare threshold against score */
371 if (spamd_score
>= spamd_threshold
) {
372 /* spam as determined by user's threshold */
380 /* remember user name and "been here" for it */
381 Ustrcpy(prev_user_name
, user_name
);
385 /* always return OK, no matter what the score */