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/*************************************************
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* Exim - an Internet mail transport agent *
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*************************************************/
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/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
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/* Code for calling spamassassin's spamd. Called from acl.c. */
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#ifdef WITH_CONTENT_SCAN
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uschar spam_score_buffer[16];
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uschar spam_score_int_buffer[16];
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uschar spam_bar_buffer[128];
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uschar spam_report_buffer[32600];
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uschar prev_user_name[128] = "";
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uschar *prev_spamd_address_work = NULL;
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spam(uschar **listptr)
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uschar *list = *listptr;
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uschar user_name_buffer[128];
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unsigned long mbox_size;
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uschar spamd_buffer[32600];
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int i, j, offset, result;
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uschar spamd_version[8];
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uschar spamd_score_char;
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double spamd_threshold, spamd_score;
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int spamd_report_offset;
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struct sockaddr_un server;
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#else /* Patch posted by Erik ? for OS X */
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struct timeval select_tv; /* and applied by PH */
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uschar *spamd_address_work;
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/* stop compiler warning */
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/* find the username from the option list */
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if ((user_name = string_nextinlist(&list, &sep,
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sizeof(user_name_buffer))) == NULL) {
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/* no username given, this means no scanning should be done */
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/* if username is "0" or "false", do not scan */
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if ( (Ustrcmp(user_name,"0") == 0) ||
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(strcmpic(user_name,US"false") == 0) ) {
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/* if there is an additional option, check if it is "true" */
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if (strcmpic(list,US"true") == 0) {
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/* in that case, always return true later */
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/* expand spamd_address if needed */
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if (*spamd_address == '$') {
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spamd_address_work = expand_string(spamd_address);
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if (spamd_address_work == NULL) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spamassassin acl condition: spamd_address starts with $, but expansion failed: %s", expand_string_message);
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spamd_address_work = spamd_address;
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/* check if previous spamd_address was expanded and has changed. dump cached results if so */
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if ( spam_ok && ( prev_spamd_address_work != NULL) && (Ustrcmp(prev_spamd_address_work, spamd_address_work) != 0)) {
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/* if we scanned for this username last time, just return */
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if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) {
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/* make sure the eml mbox file is spooled up */
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mbox_file = spool_mbox(&mbox_size, NULL);
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if (mbox_file == NULL) {
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/* error while spooling */
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: error while creating mbox spool file");
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/* socket does not start with '/' -> network socket */
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if (*spamd_address_work != '/') {
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uschar *address = NULL;
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uschar *spamd_address_list_ptr = spamd_address_work;
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uschar address_buffer[256];
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spamd_address_container * spamd_address_vector[32];
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/* Check how many spamd servers we have
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and register their addresses */
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while ((address = string_nextinlist(&spamd_address_list_ptr, &sep,
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sizeof(address_buffer))) != NULL) {
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/* Potential memory leak as we never free the store. */
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spamd_address_container *this_spamd =
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(spamd_address_container *)store_get(sizeof(spamd_address_container));
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/* grok spamd address and port */
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if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) {
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log_write(0, LOG_MAIN,
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"spam acl condition: warning - invalid spamd address: '%s'", address);
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spamd_address_vector[num_servers] = this_spamd;
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if (num_servers > 31)
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/* check if we have at least one server */
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: no useable spamd server addresses in spamd_address configuration option.");
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(void)fclose(mbox_file);
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while ( num_servers > 0 ) {
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/* Randomly pick a server to try */
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current_server = random_number( num_servers );
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debug_printf("trying server %s, port %u\n",
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spamd_address_vector[current_server]->tcp_addr,
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spamd_address_vector[current_server]->tcp_port);
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/* contact a spamd */
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if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: error creating IP socket for spamd");
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(void)fclose(mbox_file);
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if (ip_connect( spamd_sock,
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spamd_address_vector[current_server]->tcp_addr,
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spamd_address_vector[current_server]->tcp_port,
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: warning - spamd connection to %s, port %u failed: %s",
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spamd_address_vector[current_server]->tcp_addr,
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spamd_address_vector[current_server]->tcp_port,
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(void)close(spamd_sock);
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/* Remove the server from the list. XXX We should free the memory */
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for( i = current_server; i < num_servers; i++ )
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spamd_address_vector[i] = spamd_address_vector[i+1];
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if ( num_servers == 0 ) {
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log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed");
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(void)fclose(mbox_file);
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/* open the local socket */
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if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"malware acl condition: spamd: unable to acquire socket (%s)",
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(void)fclose(mbox_file);
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server.sun_family = AF_UNIX;
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Ustrcpy(server.sun_path, spamd_address_work);
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if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"malware acl condition: spamd: unable to connect to UNIX socket %s (%s)",
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spamd_address_work, strerror(errno) );
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(void)fclose(mbox_file);
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(void)close(spamd_sock);
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if (spamd_sock == -1) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"programming fault, spamd_sock unexpectedly unset");
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(void)fclose(mbox_file);
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(void)close(spamd_sock);
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/* now we are connected to spamd on spamd_sock */
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(void)string_format(spamd_buffer,
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sizeof(spamd_buffer),
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"REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n",
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/* send our request */
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if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) {
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(void)close(spamd_sock);
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: spamd send failed: %s", strerror(errno));
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(void)fclose(mbox_file);
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(void)close(spamd_sock);
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/* now send the file */
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/* spamd sometimes accepts conections but doesn't read data off
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* the connection. We make the file descriptor non-blocking so
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* that the write will only write sufficient data without blocking
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* and we poll the desciptor to make sure that we can write without
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* blocking. Short writes are gracefully handled and if the whole
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* trasaction takes too long it is aborted.
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* Note: poll() is not supported in OSX 10.2 and is reported to be
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* broken in more recent versions (up to 10.4).
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pollfd.fd = spamd_sock;
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pollfd.events = POLLOUT;
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(void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK);
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read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file);
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result = poll(&pollfd, 1, 1000);
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/* Patch posted by Erik ? for OS X and applied by PH */
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select_tv.tv_sec = 1;
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select_tv.tv_usec = 0;
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FD_SET(spamd_sock, &select_fd);
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result = select(spamd_sock+1, NULL, &select_fd, NULL, &select_tv);
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/* End Erik's patch */
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if (result == -1 && errno == EINTR)
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else if (result < 1) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: %s on spamd socket", strerror(errno));
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if (time(NULL) - start < SPAMD_TIMEOUT)
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: timed out writing spamd socket");
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(void)close(spamd_sock);
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(void)fclose(mbox_file);
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wrote = send(spamd_sock,spamd_buffer + offset,read - offset,0);
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: %s on spamd socket", strerror(errno));
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(void)close(spamd_sock);
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(void)fclose(mbox_file);
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if (offset + wrote != read) {
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while (!feof(mbox_file) && !ferror(mbox_file));
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if (ferror(mbox_file)) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: error reading spool file: %s", strerror(errno));
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(void)close(spamd_sock);
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(void)fclose(mbox_file);
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(void)fclose(mbox_file);
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/* we're done sending, close socket for writing */
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shutdown(spamd_sock,SHUT_WR);
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/* read spamd response using what's left of the timeout.
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memset(spamd_buffer, 0, sizeof(spamd_buffer));
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while((i = ip_recv(spamd_sock,
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spamd_buffer + offset,
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sizeof(spamd_buffer) - offset - 1,
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SPAMD_TIMEOUT - time(NULL) + start)) > 0 ) {
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if((i <= 0) && (errno != 0)) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: error reading from spamd socket: %s", strerror(errno));
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(void)close(spamd_sock);
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(void)close(spamd_sock);
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/* dig in the spamd output and put the report in a multiline header, if requested */
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if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n",
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spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
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/* try to fall back to pre-2.50 spamd output */
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if( sscanf(CS spamd_buffer,"SPAMD/%7s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n",
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spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) {
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log_write(0, LOG_MAIN|LOG_PANIC,
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"spam acl condition: cannot parse spamd output");
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/* Create report. Since this is a multiline string,
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we must hack it into shape first */
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p = &spamd_buffer[spamd_report_offset];
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q = spam_report_buffer;
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/* add an extra space after the newline to ensure
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that it is treated as a header continuation line */
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/* cut off trailing leftovers */
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spam_report = spam_report_buffer;
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/* create spam bar */
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spamd_score_char = spamd_score > 0 ? '+' : '-';
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j = abs((int)(spamd_score));
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while((i < j) && (i <= MAX_SPAM_BAR_CHARS))
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spam_bar_buffer[i++] = spamd_score_char;
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spam_bar_buffer[0] = '/';
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spam_bar_buffer[i] = '\0';
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spam_bar = spam_bar_buffer;
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/* create "float" spam score */
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(void)string_format(spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score);
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spam_score = spam_score_buffer;
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/* create "int" spam score */
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j = (int)((spamd_score + 0.001)*10);
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(void)string_format(spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j);
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spam_score_int = spam_score_int_buffer;
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/* compare threshold against score */
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if (spamd_score >= spamd_threshold) {
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/* spam as determined by user's threshold */
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/* remember expanded spamd_address if needed */
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if (spamd_address_work != spamd_address) {
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prev_spamd_address_work = string_copy(spamd_address_work);
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/* remember user name and "been here" for it */
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Ustrcpy(prev_user_name, user_name);
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/* always return OK, no matter what the score */