- (when (string? line)
- (print "got " line)
- (cond
- ((smtp-command? "helo" line)
- (smtp-session 'set-helo! (smtp-command-args "helo" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "ehlo" line)
- (smtp-session 'set-helo! (smtp-command-args "helo" line))
- (smtp-session 'send
- "250-" (config-host config)
- " Hello " (smtp-command-args "ehlo" line))
- (smtp-session 'send "250 AUTH PLAIN")
- ;; (smtp-session 'send "250 STARTTLS")
- (loop msg received-messages))
- ((smtp-command? "auth plain" line)
- (let* ((auth-string (smtp-command-args "auth plain" line))
- (auth-decoded (base64-decode auth-string))
- (auth-list (string-split auth-decoded "\x00"))
- (user (car auth-list))
- (password (cadr auth-list)))
- (smtp-session 'set-user! user)
- (smtp-session 'set-password! password)
- (print "Attempted login, user: " user ", password: " password)
- (smtp-session 'send "235 authentication successful")
- (loop msg received-messages)))
- ((smtp-command? "mail from:" line)
- (message-from-set! msg (smtp-command-args "mail from:" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "rcpt to:" line)
- (message-to-set! msg (smtp-command-args "rcpt to:" line))
- (smtp-session 'send "250 ok")
- (loop msg received-messages))
- ((smtp-command? "data" line)
- (smtp-session 'send "354 intermediate")
- (let text-loop ((text (conc "Received: from " (smtp-session 'helo) "\n"
- " by " (config-host config) "\n"
- " for " (message-from msg)
- "; " (time-stamp) "\n")))
- (let ((text-line (smtp-session 'get-line)))
- (if (string=? "." text-line)
- (message-text-set! msg text)
- (text-loop (conc text text-line "\n")))))
- (message-user-set! msg (smtp-session 'user))
- (message-password-set! msg (smtp-session 'password))
- (smtp-session 'send "250 ok")
- (loop (make-empty-message) (cons msg received-messages)))
- ((smtp-command? "quit" line)
- (smtp-session 'send "221 closing transmission channel")
- received-messages)
- ((string=? "" (string-trim line))
- (loop msg received-messages))
- (else
- (smtp-session 'send "502 command not implemented")
- (loop msg received-messages)))))))
+ (print "got " line)
+ (if (not (string? line))
+ '() ; Don't keep anything on unexpected termination.
+ (cond
+ ((smtp-command? "helo" line)
+ (smtp-session 'set-helo! (smtp-command-args "helo" line))
+ (smtp-session 'send "250 ok")
+ (loop mmsg received-messages))
+ ((smtp-command? "ehlo" line)
+ (smtp-session 'set-helo! (smtp-command-args "helo" line))
+ (smtp-session 'send
+ "250-" (config-host config)
+ " Hello " (smtp-command-args "ehlo" line))
+ (smtp-session 'send "250 AUTH PLAIN")
+ ;; (smtp-session 'send "250 STARTTLS")
+ (loop mmsg received-messages))
+ ((smtp-command? "auth plain" line)
+ (let* ((auth-string (smtp-command-args "auth plain" line))
+ (auth-decoded (base64-decode auth-string))
+ (auth-list (string-split auth-decoded "\x00"))
+ (user (car auth-list))
+ (password (cadr auth-list)))
+ (multi-message-user-set! mmsg user)
+ (multi-message-password-set! mmsg password)
+ (print "Attempted login, user: " user ", password: " password)
+ (smtp-session 'send "235 authentication successful")
+ (loop mmsg received-messages)))
+ ((smtp-command? "mail from:" line)
+ (multi-message-from-set! mmsg (smtp-command-args "mail from:" line))
+ (smtp-session 'send "250 ok")
+ (loop mmsg received-messages))
+ ((smtp-command? "rcpt to:" line)
+ (let* ((to (smtp-command-args "rcpt to:" line))
+ (stamp (make-message-stamp to mmsg config)))
+ (print to)
+ (if (car stamp)
+ (begin
+ (multi-message-tos-set! mmsg (cons to (multi-message-tos mmsg)))
+ (multi-message-stamps-set! mmsg (cons stamp (multi-message-stamps mmsg)))
+ (smtp-session 'send "250 ok"))
+ (begin
+ (smtp-session 'send "551 relay forbidden"))))
+ (loop mmsg received-messages))
+ ((smtp-command? "data" line)
+ (smtp-session 'send "354 intermediate")
+ (let text-loop ((text ""))
+ (let ((text-line (smtp-session 'get-line)))
+ (if (string=? "." text-line)
+ (multi-message-text-set! mmsg text)
+ (text-loop (conc text text-line "\n")))))
+ (smtp-session 'send "250 ok")
+ (loop (make-empty-multi-message)
+ (append (make-single-recipient-messages mmsg smtp-session config)
+ received-messages)))
+ ((smtp-command? "quit" line)
+ (smtp-session 'send "221 closing transmission channel")
+ received-messages)
+ ((string=? "" (string-trim line))
+ (loop mmsg received-messages))
+ (else
+ (smtp-session 'send "502 command not implemented")
+ (loop mmsg received-messages)))))))
+
+(define (make-single-recipient-messages mmsg smtp-session config)
+ (map
+ (lambda (to stamp)
+ (print "making singleton messages: " to " " stamp)
+ (make-message to (multi-message-from mmsg)
+ (conc "Received: from " (smtp-session 'helo) "\n"
+ "\tby " (config-host config) "\n"
+ "\tfor " to ";\n"
+ "\t" (time-stamp) "\n"
+ (multi-message-text mmsg))
+ (multi-message-user mmsg)
+ (multi-message-password mmsg)
+ stamp))
+ (multi-message-tos mmsg)
+ (multi-message-stamps mmsg)))
+
+
+;;; Message stamping and validation
+;;
+
+(define (get-local-addresses config)
+ (map (lambda (p) (cons
+ (conc "<" (car p) "@" (config-host config) ">")
+ (cdr p)))
+ (map (lambda (file)
+ (list (pathname-file file) file
+ (let ((password-file (conc file ".auth")))
+ (if (file-exists? password-file)
+ (with-input-from-file password-file read-line)
+ #f))))
+ (filter directory-exists?
+ (glob (conc (config-spool-dir config) "/*"))))))
+
+(define (make-message-stamp to mmsg config)
+ (let* ((local-addresses (get-local-addresses config))
+ (local-dest (assoc to local-addresses))
+ (local-src (assoc (multi-message-from mmsg) local-addresses)))
+ (cond
+ (local-dest
+ (list #t 'local (cadr local-dest)))
+ (local-src
+ (let ((host-password (caddr local-src)))
+ (if (and (string=? (conc "<" (multi-message-user mmsg) "@" (config-host config) ">")
+ (multi-message-from mmsg))
+ host-password
+ (string=? (multi-message-password mmsg) host-password))
+ (list #t 'remote)
+ (begin
+ (print "Provided password " (multi-message-password mmsg))
+ (print "Host password " host-password)
+ (list #f 'remote)))))
+ (else
+ (list #f 'relay)))))