1 /* $Cambridge: exim/src/src/spam.c,v 1.2 2004/12/16 15:11:47 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 long mbox_size
;
32 uschar spamd_buffer
[32600];
34 uschar spamd_version
[8];
35 uschar spamd_score_char
;
36 double spamd_threshold
, spamd_score
;
37 int spamd_report_offset
;
40 struct sockaddr_un server
;
42 /* find the username from the option list */
43 if ((user_name
= string_nextinlist(&list
, &sep
,
45 sizeof(user_name_buffer
))) == NULL
) {
46 /* no username given, this means no scanning should be done */
50 /* if username is "0" or "false", do not scan */
51 if ( (Ustrcmp(user_name
,"0") == 0) ||
52 (strcmpic(user_name
,US
"false") == 0) ) {
56 /* if there is an additional option, check if it is "true" */
57 if (strcmpic(list
,US
"true") == 0) {
58 /* in that case, always return true later */
62 /* if we scanned for this username last time, just return */
63 if ( spam_ok
&& ( Ustrcmp(prev_user_name
, user_name
) == 0 ) ) {
70 /* make sure the eml mbox file is spooled up */
71 mbox_file
= spool_mbox(&mbox_size
);
73 if (mbox_file
== NULL
) {
74 /* error while spooling */
75 log_write(0, LOG_MAIN
|LOG_PANIC
,
76 "spam acl condition: error while creating mbox spool file");
80 /* socket does not start with '/' -> network socket */
81 if (*spamd_address
!= '/') {
82 time_t now
= time(NULL
);
84 int current_server
= 0;
86 uschar
*address
= NULL
;
87 uschar
*spamd_address_list_ptr
= spamd_address
;
88 uschar address_buffer
[256];
89 spamd_address_container
* spamd_address_vector
[32];
91 /* Check how many spamd servers we have
92 and register their addresses */
93 while ((address
= string_nextinlist(&spamd_address_list_ptr
, &sep
,
95 sizeof(address_buffer
))) != NULL
) {
97 spamd_address_container
*this_spamd
=
98 (spamd_address_container
*)store_get(sizeof(spamd_address_container
));
100 /* grok spamd address and port */
101 if( sscanf(CS address
, "%s %u", this_spamd
->tcp_addr
, &(this_spamd
->tcp_port
)) != 2 ) {
102 log_write(0, LOG_MAIN
,
103 "spam acl condition: warning - invalid spamd address: '%s'", address
);
107 spamd_address_vector
[num_servers
] = this_spamd
;
109 if (num_servers
> 31)
113 /* check if we have at least one server */
115 log_write(0, LOG_MAIN
|LOG_PANIC
,
116 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
121 current_server
= start_server
= (int)now
% num_servers
;
125 debug_printf("trying server %s, port %u\n",
126 spamd_address_vector
[current_server
]->tcp_addr
,
127 spamd_address_vector
[current_server
]->tcp_port
);
129 /* contact a spamd */
130 if ( (spamd_sock
= ip_socket(SOCK_STREAM
, AF_INET
)) < 0) {
131 log_write(0, LOG_MAIN
|LOG_PANIC
,
132 "spam acl condition: error creating IP socket for spamd");
137 if (ip_connect( spamd_sock
,
139 spamd_address_vector
[current_server
]->tcp_addr
,
140 spamd_address_vector
[current_server
]->tcp_port
,
146 log_write(0, LOG_MAIN
|LOG_PANIC
,
147 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
148 spamd_address_vector
[current_server
]->tcp_addr
,
149 spamd_address_vector
[current_server
]->tcp_port
,
152 if (current_server
>= num_servers
)
154 if (current_server
== start_server
) {
155 log_write(0, LOG_MAIN
|LOG_PANIC
, "spam acl condition: all spamd servers failed");
164 /* open the local socket */
166 if ((spamd_sock
= socket(AF_UNIX
, SOCK_STREAM
, 0)) < 0) {
167 log_write(0, LOG_MAIN
|LOG_PANIC
,
168 "malware acl condition: spamd: unable to acquire socket (%s)",
174 server
.sun_family
= AF_UNIX
;
175 Ustrcpy(server
.sun_path
, spamd_address
);
177 if (connect(spamd_sock
, (struct sockaddr
*) &server
, sizeof(struct sockaddr_un
)) < 0) {
178 log_write(0, LOG_MAIN
|LOG_PANIC
,
179 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
180 spamd_address
, strerror(errno
) );
188 /* now we are connected to spamd on spamd_sock */
189 snprintf(CS spamd_buffer
,
190 sizeof(spamd_buffer
),
191 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %lld\r\n\r\n",
195 /* send our request */
196 if (send(spamd_sock
, spamd_buffer
, Ustrlen(spamd_buffer
), 0) < 0) {
198 log_write(0, LOG_MAIN
|LOG_PANIC
,
199 "spam acl condition: spamd send failed: %s", strerror(errno
));
205 /* now send the file */
207 j
= fread(spamd_buffer
,1,sizeof(spamd_buffer
),mbox_file
);
209 i
= send(spamd_sock
,spamd_buffer
,j
,0);
211 log_write(0, LOG_MAIN
|LOG_PANIC
,
212 "spam acl condition: error/short send to spamd");
223 /* we're done sending, close socket for writing */
224 shutdown(spamd_sock
,SHUT_WR
);
226 /* read spamd response */
227 memset(spamd_buffer
, 0, sizeof(spamd_buffer
));
229 while((i
= ip_recv(spamd_sock
,
230 spamd_buffer
+ offset
,
231 sizeof(spamd_buffer
) - offset
- 1,
232 SPAMD_READ_TIMEOUT
)) > 0 ) {
237 if((i
<= 0) && (errno
!= 0)) {
238 log_write(0, LOG_MAIN
|LOG_PANIC
,
239 "spam acl condition: error reading from spamd socket: %s", strerror(errno
));
247 /* dig in the spamd output and put the report in a multiline header, if requested */
248 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
249 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
251 /* try to fall back to pre-2.50 spamd output */
252 if( sscanf(CS spamd_buffer
,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
253 spamd_version
,&spamd_score
,&spamd_threshold
,&spamd_report_offset
) != 3 ) {
254 log_write(0, LOG_MAIN
|LOG_PANIC
,
255 "spam acl condition: cannot parse spamd output");
260 /* Create report. Since this is a multiline string,
261 we must hack it into shape first */
262 p
= &spamd_buffer
[spamd_report_offset
];
263 q
= spam_report_buffer
;
276 while( (*p
<= ' ') && (*p
!= '\0') ) {
286 /* cut off trailing leftovers */
291 spam_report
= spam_report_buffer
;
293 /* create spam bar */
294 spamd_score_char
= spamd_score
> 0 ? '+' : '-';
295 j
= abs((int)(spamd_score
));
298 while((i
< j
) && (i
<= MAX_SPAM_BAR_CHARS
))
299 spam_bar_buffer
[i
++] = spamd_score_char
;
302 spam_bar_buffer
[0] = '/';
305 spam_bar_buffer
[i
] = '\0';
306 spam_bar
= spam_bar_buffer
;
308 /* create "float" spam score */
309 snprintf(CS spam_score_buffer
, sizeof(spam_score_buffer
),"%.1f", spamd_score
);
310 spam_score
= spam_score_buffer
;
312 /* create "int" spam score */
313 j
= (int)((spamd_score
+ 0.001)*10);
314 snprintf(CS spam_score_int_buffer
, sizeof(spam_score_int_buffer
), "%d", j
);
315 spam_score_int
= spam_score_int_buffer
;
317 /* compare threshold against score */
318 if (spamd_score
>= spamd_threshold
) {
319 /* spam as determined by user's threshold */
327 /* remember user name and "been here" for it */
328 Ustrcpy(prev_user_name
, user_name
);
332 /* always return OK, no matter what the score */