1 /* $Cambridge: exim/src/src/spam.c,v 1.1.2.2 2004/11/26 16:04:26 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 #ifdef WITH_CONTENT_SCAN
9 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
12 /* Code for calling spamassassin's spamd. Called from acl.c. */
17 uschar spam_score_buffer[16];
18 uschar spam_score_int_buffer[16];
19 uschar spam_bar_buffer[128];
20 uschar spam_report_buffer[32600];
21 uschar prev_user_name[128] = "";
25 int spam(uschar **listptr) {
27 uschar *list = *listptr;
29 uschar user_name_buffer[128];
30 unsigned long long mbox_size;
33 uschar spamd_buffer[32600];
35 uschar spamd_version[8];
36 uschar spamd_score_char;
37 double spamd_threshold, spamd_score;
38 int spamd_report_offset;
41 struct sockaddr_un server;
43 /* find the username from the option list */
44 if ((user_name = string_nextinlist(&list, &sep,
46 sizeof(user_name_buffer))) == NULL) {
47 /* no username given, this means no scanning should be done */
51 /* if username is "0" or "false", do not scan */
52 if ( (Ustrcmp(user_name,"0") == 0) ||
53 (strcmpic(user_name,US"false") == 0) ) {
57 /* if there is an additional option, check if it is "true" */
58 if (strcmpic(list,US"true") == 0) {
59 /* in that case, always return true later */
63 /* if we scanned for this username last time, just return */
64 if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) {
71 /* make sure the eml mbox file is spooled up */
72 mbox_file = spool_mbox(&mbox_size);
74 if (mbox_file == NULL) {
75 /* error while spooling */
76 log_write(0, LOG_MAIN|LOG_PANIC,
77 "spam acl condition: error while creating mbox spool file");
81 /* socket does not start with '/' -> network socket */
82 if (*spamd_address != '/') {
83 time_t now = time(NULL);
85 int current_server = 0;
87 uschar *address = NULL;
88 uschar *spamd_address_list_ptr = spamd_address;
89 uschar address_buffer[256];
90 spamd_address_container * spamd_address_vector[32];
92 /* Check how many spamd servers we have
93 and register their addresses */
94 while ((address = string_nextinlist(&spamd_address_list_ptr, &sep,
96 sizeof(address_buffer))) != NULL) {
98 spamd_address_container *this_spamd =
99 (spamd_address_container *)store_get(sizeof(spamd_address_container));
101 /* grok spamd address and port */
102 if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) {
103 log_write(0, LOG_MAIN,
104 "spam acl condition: warning - invalid spamd address: '%s'", address);
108 spamd_address_vector[num_servers] = this_spamd;
110 if (num_servers > 31)
114 /* check if we have at least one server */
116 log_write(0, LOG_MAIN|LOG_PANIC,
117 "spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
122 current_server = start_server = (int)now % num_servers;
126 debug_printf("trying server %s, port %u\n",
127 spamd_address_vector[current_server]->tcp_addr,
128 spamd_address_vector[current_server]->tcp_port);
130 /* contact a spamd */
131 if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
132 log_write(0, LOG_MAIN|LOG_PANIC,
133 "spam acl condition: error creating IP socket for spamd");
138 if (ip_connect( spamd_sock,
140 spamd_address_vector[current_server]->tcp_addr,
141 spamd_address_vector[current_server]->tcp_port,
147 log_write(0, LOG_MAIN|LOG_PANIC,
148 "spam acl condition: warning - spamd connection to %s, port %u failed: %s",
149 spamd_address_vector[current_server]->tcp_addr,
150 spamd_address_vector[current_server]->tcp_port,
153 if (current_server >= num_servers)
155 if (current_server == start_server) {
156 log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed");
165 /* open the local socket */
167 if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
168 log_write(0, LOG_MAIN|LOG_PANIC,
169 "malware acl condition: spamd: unable to acquire socket (%s)",
175 server.sun_family = AF_UNIX;
176 Ustrcpy(server.sun_path, spamd_address);
178 if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
179 log_write(0, LOG_MAIN|LOG_PANIC,
180 "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
181 spamd_address, strerror(errno) );
189 /* now we are connected to spamd on spamd_sock */
190 snprintf(CS spamd_buffer,
191 sizeof(spamd_buffer),
192 "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %lld\r\n\r\n",
196 /* send our request */
197 if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) {
199 log_write(0, LOG_MAIN|LOG_PANIC,
200 "spam acl condition: spamd send failed: %s", strerror(errno));
206 /* now send the file */
208 j = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file);
210 i = send(spamd_sock,spamd_buffer,j,0);
212 log_write(0, LOG_MAIN|LOG_PANIC,
213 "spam acl condition: error/short send to spamd");
224 /* we're done sending, close socket for writing */
225 shutdown(spamd_sock,SHUT_WR);
227 /* read spamd response */
228 memset(spamd_buffer, 0, sizeof(spamd_buffer));
230 while((i = ip_recv(spamd_sock,
231 spamd_buffer + offset,
232 sizeof(spamd_buffer) - offset - 1,
233 SPAMD_READ_TIMEOUT)) > 0 ) {
238 if((i <= 0) && (errno != 0)) {
239 log_write(0, LOG_MAIN|LOG_PANIC,
240 "spam acl condition: error reading from spamd socket: %s", strerror(errno));
248 /* dig in the spamd output and put the report in a multiline header, if requested */
249 if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
250 spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
252 /* try to fall back to pre-2.50 spamd output */
253 if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
254 spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
255 log_write(0, LOG_MAIN|LOG_PANIC,
256 "spam acl condition: cannot parse spamd output");
261 /* Create report. Since this is a multiline string,
262 we must hack it into shape first */
263 p = &spamd_buffer[spamd_report_offset];
264 q = spam_report_buffer;
277 while( (*p <= ' ') && (*p != '\0') ) {
287 /* cut off trailing leftovers */
292 spam_report = spam_report_buffer;
294 /* create spam bar */
295 spamd_score_char = spamd_score > 0 ? '+' : '-';
296 j = abs((int)(spamd_score));
299 while((i < j) && (i <= MAX_SPAM_BAR_CHARS))
300 spam_bar_buffer[i++] = spamd_score_char;
303 spam_bar_buffer[0] = '/';
306 spam_bar_buffer[i] = '\0';
307 spam_bar = spam_bar_buffer;
309 /* create "float" spam score */
310 snprintf(CS spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score);
311 spam_score = spam_score_buffer;
313 /* create "int" spam score */
314 j = (int)((spamd_score + 0.001)*10);
315 snprintf(CS spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j);
316 spam_score_int = spam_score_int_buffer;
318 /* compare threshold against score */
319 if (spamd_score >= spamd_threshold) {
320 /* spam as determined by user's threshold */
328 /* remember user name and "been here" for it */
329 Ustrcpy(prev_user_name, user_name);
333 /* always return OK, no matter what the score */