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--- 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
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