1 /* $Cambridge: exim/src/src/spam.c,v 1.1.2.1 2004/11/26 09:13:34 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* This file is part of the exiscan-acl content scanner
8 patch. It is NOT part of the standard exim distribution. */
10 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
13 /* Code for calling spamassassin's spamd. Called from acl.c. */
18 uschar spam_score_buffer[16];
19 uschar spam_score_int_buffer[16];
20 uschar spam_bar_buffer[128];
21 uschar spam_report_buffer[32600];
22 uschar prev_user_name[128] = "";
26 int spam(uschar **listptr) {
28 uschar *list = *listptr;
30 uschar user_name_buffer[128];
31 unsigned long long mbox_size;
34 uschar spamd_buffer[32600];
36 uschar spamd_version[8];
37 uschar spamd_score_char;
38 double spamd_threshold, spamd_score;
39 int spamd_report_offset;
42 struct sockaddr_un server;
44 /* find the username from the option list */
45 if ((user_name = string_nextinlist(&list, &sep,
47 sizeof(user_name_buffer))) == NULL) {
48 /* no username given, this means no scanning should be done */
52 /* if username is "0" or "false", do not scan */
53 if ( (Ustrcmp(user_name,"0") == 0) ||
54 (strcmpic(user_name,US"false") == 0) ) {
58 /* if there is an additional option, check if it is "true" */
59 if (strcmpic(list,US"true") == 0) {
60 /* in that case, always return true later */
64 /* if we scanned for this username last time, just return */
65 if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) {
72 /* make sure the eml mbox file is spooled up */
73 mbox_file = spool_mbox(&mbox_size);
75 if (mbox_file == NULL) {
76 /* error while spooling */
77 log_write(0, LOG_MAIN|LOG_PANIC,
78 "spam acl condition: error while creating mbox spool file");
82 /* socket does not start with '/' -> network socket */
83 if (*spamd_address != '/') {
84 time_t now = time(NULL);
86 int current_server = 0;
88 uschar *address = NULL;
89 uschar *spamd_address_list_ptr = spamd_address;
90 uschar address_buffer[256];
91 spamd_address_container * spamd_address_vector[32];
93 /* Check how many spamd servers we have
94 and register their addresses */
95 while ((address = string_nextinlist(&spamd_address_list_ptr, &sep,
97 sizeof(address_buffer))) != NULL) {
99 spamd_address_container *this_spamd =
100 (spamd_address_container *)store_get(sizeof(spamd_address_container));
102 /* grok spamd address and port */
103 if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) {
104 log_write(0, LOG_MAIN,
105 "spam acl condition: warning - invalid spamd address: '%s'", address);
109 spamd_address_vector[num_servers] = this_spamd;
111 if (num_servers > 31)
115 /* check if we have at least one server */
117 log_write(0, LOG_MAIN|LOG_PANIC,
118 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
123 current_server = start_server = (int)now % num_servers;
127 debug_printf("trying server %s, port %u\n",
128 spamd_address_vector[current_server]->tcp_addr,
129 spamd_address_vector[current_server]->tcp_port);
131 /* contact a spamd */
132 if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
133 log_write(0, LOG_MAIN|LOG_PANIC,
134 "spam acl condition: error creating IP socket for spamd");
139 if (ip_connect( spamd_sock,
141 spamd_address_vector[current_server]->tcp_addr,
142 spamd_address_vector[current_server]->tcp_port,
148 log_write(0, LOG_MAIN|LOG_PANIC,
149 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
150 spamd_address_vector[current_server]->tcp_addr,
151 spamd_address_vector[current_server]->tcp_port,
154 if (current_server >= num_servers)
156 if (current_server == start_server) {
157 log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed");
166 /* open the local socket */
168 if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
169 log_write(0, LOG_MAIN|LOG_PANIC,
170 "malware acl condition: spamd: unable to acquire socket (%s)",
176 server.sun_family = AF_UNIX;
177 Ustrcpy(server.sun_path, spamd_address);
179 if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
180 log_write(0, LOG_MAIN|LOG_PANIC,
181 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
182 spamd_address, strerror(errno) );
190 /* now we are connected to spamd on spamd_sock */
191 snprintf(CS spamd_buffer,
192 sizeof(spamd_buffer),
193 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %lld\r\n\r\n",
197 /* send our request */
198 if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) {
200 log_write(0, LOG_MAIN|LOG_PANIC,
201 "spam acl condition: spamd send failed: %s", strerror(errno));
207 /* now send the file */
209 j = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file);
211 i = send(spamd_sock,spamd_buffer,j,0);
213 log_write(0, LOG_MAIN|LOG_PANIC,
214 "spam acl condition: error/short send to spamd");
225 /* we're done sending, close socket for writing */
226 shutdown(spamd_sock,SHUT_WR);
228 /* read spamd response */
229 memset(spamd_buffer, 0, sizeof(spamd_buffer));
231 while((i = ip_recv(spamd_sock,
232 spamd_buffer + offset,
233 sizeof(spamd_buffer) - offset - 1,
234 SPAMD_READ_TIMEOUT)) > 0 ) {
239 if((i <= 0) && (errno != 0)) {
240 log_write(0, LOG_MAIN|LOG_PANIC,
241 "spam acl condition: error reading from spamd socket: %s", strerror(errno));
249 /* dig in the spamd output and put the report in a multiline header, if requested */
250 if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
251 spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
253 /* try to fall back to pre-2.50 spamd output */
254 if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
255 spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
256 log_write(0, LOG_MAIN|LOG_PANIC,
257 "spam acl condition: cannot parse spamd output");
262 /* Create report. Since this is a multiline string,
263 we must hack it into shape first */
264 p = &spamd_buffer[spamd_report_offset];
265 q = spam_report_buffer;
278 while( (*p <= ' ') && (*p != '\0') ) {
288 /* cut off trailing leftovers */
293 spam_report = spam_report_buffer;
295 /* create spam bar */
296 spamd_score_char = spamd_score > 0 ? '+' : '-';
297 j = abs((int)(spamd_score));
300 while((i < j) && (i <= MAX_SPAM_BAR_CHARS))
301 spam_bar_buffer[i++] = spamd_score_char;
304 spam_bar_buffer[0] = '/';
307 spam_bar_buffer[i] = '\0';
308 spam_bar = spam_bar_buffer;
310 /* create "float" spam score */
311 snprintf(CS spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score);
312 spam_score = spam_score_buffer;
314 /* create "int" spam score */
315 j = (int)((spamd_score + 0.001)*10);
316 snprintf(CS spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j);
317 spam_score_int = spam_score_int_buffer;
319 /* compare threshold against score */
320 if (spamd_score >= spamd_threshold) {
321 /* spam as determined by user's threshold */
329 /* remember user name and "been here" for it */
330 Ustrcpy(prev_user_name, user_name);
334 /* always return OK, no matter what the score */