In the FreeBSD ports there now exists a way to compile vpopmail with a patch that will include spamassassin to be run from vdelivermail so all mail that goes to any domains it manages will be scanned, and it allows for user based bayesion filtering and what not, ever since it was included in the FreeBSD ports and i have used it, i have found that its a fast easy way to add spamassassin and customers have loved it more than ever. We get very little false positives, and even then its awesome.
Here is the patch, this is a repost of code that Alex Dupre added to the ports tree, i did not email him if it was okay, but i will assume so as he is letting people freely use it in the ports tree.
I know i should have posted this at sourceforge, but i am a complete noob with its system. Props once again for this patch go to Alex Dupre. To compile you will need to set SPAM_THRESHOLD to something, on the FreeBSD compile this is normally 15, but testing has suggest 10 is the best to go with. SPAMC has to be set to the location where it is located.
--- vdelivermail.c.orig Mon Oct 20 20:59:57 2003 +++ vdelivermail.c Sat Nov 1 11:21:15 2003 @@ -62,6 +62,7 @@ #define FILE_SIZE 156 char hostname[FILE_SIZE]; char loop_buf[FILE_SIZE]; +char spam_buf[FILE_SIZE];
#define MSG_BUF_SIZE 5000 char msgbuf[MSG_BUF_SIZE]; @@ -90,6 +91,10 @@ void usernotfound(void); int is_loop_match( char *dt, char *address); int deliver_quota_warning(const char *dir, const char *q); +#ifdef SPAM_THRESHOLD +int is_spam(int threshold); +int is_spam_match(char *xsl, int threshold); +#endif
static char local_file[156]; static char local_file_new[156]; @@ -257,7 +262,7 @@
/* check for wildcard if there's no match */
if(tmpstr == NULL) {
- for(i=strlen(TheUser);i >= 0 && j != 1;--i) {
+ for(i=strlen(TheUser);i > 0 && j != 1;--i) {
if(TheUser[i-1]=='-') {
tmpuser[0] = '\0';
strncat(tmpuser,TheUser,i);
@@ -444,6 +449,7 @@
int inject = 0;
FILE *fs;
char tmp_file[256];
+ int pim[2]; /* check if the email is looping to this user */
if ( is_looping( address ) == 1 ) {
@@ -631,6 +637,51 @@
}
}+#ifdef SPAMC
+ /* fork the SpamAssassin client - patch by Alex Dupre */
+ if (!pipe(pim)) {
+ pid = vfork();
+ switch (pid) {
+ case -1:
+ close(pim[0]);
+ close(pim[1]);
+ break;
+ case 0:
+ close(pim[0]);
+ dup2(pim[1], 1);
+ close(pim[1]);
+ if (execl(SPAMC, SPAMC, "-u", maildir_to_email(address), 0) == -1) {
+ while ((file_count = read(0, msgbuf, MSG_BUF_SIZE)) > 0)
+ write(1, msgbuf, file_count);
+ _exit(0);
+ }
+ }
+ close(pim[1]);
+ dup2(pim[0], 0);
+ close(pim[0]);
+ }
+#ifdef SPAM_THRESHOLD
+ /* silently delete message if spam level > SPAM_THRESHOLD */
+ if (is_spam(SPAM_THRESHOLD) == 1) {
+ close(write_fd);
+ if (unlink(local_file) != 0) {
+ printf("unlink failed %s errno = %d\n", local_file, errno);
+ return(errno);
+ }
+ return(0);
+ }
+
+#ifdef MAKE_SEEKABLE
+ if (!Seekable(0))
+ MakeSeekable(stdin);
+#endif
+
+ if (lseek(0, 0L, SEEK_SET) < 0) {
+ printf("lseek errno=%d\n", errno);
+ return(errno);
+ }
+#endif
+#endif
/* read it in chunks and write it to the new file */
while((file_count=read(0,msgbuf,MSG_BUF_SIZE))>0) {
@@ -881,6 +932,9 @@
if (strncmp(loop_buf, "Delivered-To: ", 14) == 0 &&
is_loop_match(loop_buf, address)==1 ) {+ /* seek to the end of stdin */
+ fseek(stdin, 0L, SEEK_END);
+
/* return the loop found */
return(1);@@ -919,6 +973,8 @@
* looping not found value
*/
if ( found == 0 ) {
+ /* seek to the end of stdin */
+ fseek(stdin, 0L, SEEK_END);
/* return not found looping message value */
return(0);
}
@@ -1335,3 +1391,96 @@
return(1);
}+#ifdef SPAM_THRESHOLD
+/* Check for a spam message
+ * This is done by checking for a matching line
+ * in the email headers for X-Spam-Level: which
+ * we put in each spam email
+ *
+ * Return 1 if spam
+ * Return 0 if not spam
+ * Return -1 on error
+ */
+int is_spam(int threshold)
+{
+ int i;
+ int found;
+
+#ifdef MAKE_SEEKABLE
+ if (!Seekable(0))
+ MakeSeekable(stdin);
+#endif
+
+ if ( lseek(0, 0L, SEEK_SET) < 0 ) {
+ printf("lseek errno=%d\n", errno);
+ return(errno);
+ }
+
+ while (fgets(spam_buf, sizeof(spam_buf), stdin) != NULL){
+
+ /* if we find the line, return error (looping) */
+ if (strncmp(spam_buf, "X-Spam-Level: ", 14) == 0 &&
+ is_spam_match(spam_buf, threshold) ==1) {
+
+ /* seek to the end of stdin */
+ fseek(stdin, 0L, SEEK_END);
+
+ /* return the spam found */
+ return(1);
+
+ /* check for the start of the body, we only need
+ * to check the headers.
+ */
+ } else {
+
+ /* walk through the charaters in the body */
+ for (i = 0, found = 0; spam_buf[i] != 0 && found == 0; ++i) {
+ switch(spam_buf[i]) {
+
+ /* skip blank spaces and new lines */
+ case ' ':
+ case '\n':
+ case '\t':
+ case '\r':
+ break;
+
+ /* found a non blank, so we are still
+ * in the headers
+ */
+ default:
+
+ /* set the found non blank char flag */
+ found = 1;
+ break;
+ }
+ }
+
+ /* if the line only had blanks, then it is the
+ * delimiting line between the headers and the
+ * body. We don't need to check the body for
+ * the X-Spam-Level: line. Hence, we
+ * are done with our search and can return the
+ * spam not found value
+ */
+ if (found == 0) {
+ /* seek to the end of stdin */
+ fseek(stdin, 0L, SEEK_END);
+ /* return not found spam message value */
+ return(0);
+ }
+ }
+ }
+
+ /* if we get here then the there is either no body
+ * or the logic above failed and we scanned
+ * the whole email, headers and body.
+ */
+ return(0);
+}
+
+int is_spam_match(char *xsl, int threshold)
+{
+ if (strlen(xsl) - strlen("X-Spam-Level: ") > threshold) return(1);
+ else return(0);
+}
+#endif