+ (print "Message REMOTE DELIVERY REJECTED (relay forbidden):"))))
+ (print " * From: " (message-from msg))
+ (print " * To: " (message-to msg))
+ #t)
+ (o (exn)
+ (print "Message delivery failed.")
+ (print-error-message o))))
+
+;; Local delivery
+
+(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 (deliver-message-local msg dest-dir)
+ (with-output-to-file (conc dest-dir "/" (current-seconds))
+ (lambda ()
+ (print (message-text msg)))))
+
+
+;; Remote delivery
+
+(define (get-host-from-email email-string)
+ (car (string-split (cadr (string-split email-string "@")) ">")))
+
+(define (deliver-message-remote msg config)
+ (let ((host (get-host-from-email (message-to msg))))
+ (print "Attempting delivery to host " host)
+ (let-values (((tcp-in tcp-out) (tcp-connect host 25)))
+ (let ((smtp-session (make-outgoing-smtp-session tcp-in tcp-out)))
+ (let ((result (and
+ (smtp-session 'expect "220")
+ (smtp-session 'send "helo " (config-host config))
+ (smtp-session 'expect "250")
+ (smtp-session 'send "mail from:" (message-from msg))
+ (smtp-session 'expect "250")
+ (smtp-session 'send "rcpt to:" (message-to msg))
+ (smtp-session 'expect "250")
+ (smtp-session 'send "data")
+ (smtp-session 'expect "354")
+ (smtp-session 'send (message-text msg))
+ (smtp-session 'send ".")
+ (smtp-session 'expect "250")
+ (smtp-session 'send "quit"))))
+ (close-input-port tcp-in)
+ (close-output-port tcp-out)
+ result)))))
+
+(define ((make-outgoing-smtp-session tcp-in tcp-out) . command)
+ (match command
+ (('expect code)
+ (let ((result (read-line tcp-in)))
+ (print "Expecting " code " got " result)
+ (string-prefix? code result)))
+ (('send strings ...)
+ (print "Sending " (if (> (string-length (car strings)) 30)
+ (string-take (car strings) 30)
+ (car strings)))
+ (let ((processed-string
+ (string-translate* (conc (apply conc strings) "\n")
+ '(("\n" . "\r\n")))))
+ (write-string processed-string #f tcp-out)))))
+
+;;; Command line argument parsing
+;;
+
+(define (print-usage progname)
+ (print "Usage:\n"
+ progname " -h/--help\n"
+ progname " [-u/--user UID] [-g/--group GID] hostname [[port [spooldir]]\n"
+ "\n"
+ "The -u and -g options can be used to set the UID and GID of the process\n"
+ "following the creation of the TCP port listener (which often requires root)."))
+
+(define (main)
+ (let ((progname (pathname-file (car (argv))))
+ (config (make-config "" 25 "/var/spool/mail" '() '())))
+ (if (null? (cdr (argv)))
+ (print-usage progname)
+ (let loop ((args (cdr (argv))))
+ (let ((this-arg (car args))
+ (rest-args (cdr args)))
+ (if (string-prefix? "-" this-arg)
+ (cond
+ ((or (equal? this-arg "-u")
+ (equal? this-arg "--user"))
+ (config-user-set! config (string->number (car rest-args)))
+ (loop (cdr rest-args)))
+ ((or (equal? this-arg "-g")
+ (equal? this-arg "--group"))
+ (config-group-set! config (string->number (car rest-args)))
+ (loop (cdr rest-args)))
+ ((or (equal? this-arg "-h")
+ (equal? this-arg "--help"))
+ (print-usage progname))
+ (else
+ (print "Unknown option " this-arg "\n")
+ (print-usage progname)))
+ (begin
+ (config-host-set! config this-arg)
+ (unless (null? rest-args)
+ (config-port-set! config (string->number (car rest-args)))
+ (unless (null? (cdr rest-args))
+ (config-spool-dir-set! config (cadr rest-args))))
+ (run-server config))))))))
+
+(main)
+
+;; (define (test)
+;; (run-server (make-config "localhost" 2525 "spool" '() '())))