/usr/bin/s9hts is in scheme9 2015.11.19-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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; s9hts -- hyper text server
; by Nils M Holm, 2010,2012
; Placed in the Public Domain
;
; Usage: s9hts [-m sec] [host [port]]
(load-from-library "inet-server.scm")
(load-from-library "url-decode.scm")
(load-from-library "split-url.scm")
(load-from-library "hash-table.scm")
(load-from-library "string-position.scm")
(load-from-library "string-parse.scm")
(load-from-library "string-unsplit.scm")
(load-from-library "string-find.scm")
(load-from-library "read-line.scm")
(load-from-library "displaystar.scm")
(load-from-library "parse-optionsb.scm")
(load-from-library "spawn-command.scm")
(load-from-library "format-time.scm")
(load-from-library "unix-time-to-time.scm")
(define show-help (option #\h #f))
(define max-req (option #\m 'integer 5))
(define options `(,max-req
,show-help))
(define (usage)
(display "Usage: s9hts [-m nreq] [host [port]]");
(newline))
(define CR (integer->char 13))
(define CRLF (string CR #\newline))
(define (status out n . type)
(let ((msg (case n ((200) "ok")
((400) "huh?")
((404) "not here")
((500) "oops - I blew it")
((503) "bug me not"))))
(display* out "HTTP/1.0 " n #\space msg CRLF)
(if (not (null? type))
(display* out "Content-type: " (car type) CRLF CRLF))))
(define (last x)
(car (reverse x)))
(define (trim-empty a)
(letrec
((trim
(lambda (x)
(if (and (not (null? x))
(equal? "" (car x)))
(trim (cdr x))
x))))
(trim (reverse! (trim (reverse a))))))
(define (cant-parse out request)
(status out 400 "text/html")
(display* out "<H1>400 huh?</H1>" #\newline)
(display* out "<P>Request: " request "</P>" #\newline))
(define (not-found out file)
(status out 404 "text/html")
(display* out "<H1>404 not here</H1>" #\newline)
(display* out "<P>Path: " file "</P>" #\newline))
(define (bug-me-not out)
(status out 503 "text/html")
(display* out "<H1>503 bug me not!</H1>" #\newline))
(define (set-url-path! url path)
(set-car! (cddr url) path))
(define (set-url-suffix! url suffix)
(set-car! (cdddr url) suffix))
(define (local-path? s)
(let loop ((in (string->list s))
(depth 0))
(cond ((null? in))
((char=? #\/ (car in))
(if (and (> (length in) 3)
(string=? "/.." (string (car in) (cadr in) (caddr in))))
(if (zero? depth)
#f
(loop (cdr in) (- depth 1)))
(loop (cdr in) (+ 1 depth))))
(else
(loop (cdr in) depth)))))
(define (mime-type suffix)
(let ((table '(((#f) "text/plain")
(("html" "htm") "text/html")
(("css") "text/css")
(("jpg" "jpeg") "image/jpeg")
(("png") "image/png")
(("gif") "image/gif")
(("tar") "application/x-tar")
(("gz" "tgz") "application/x-gzip")
(("zip") "application/zip"))))
(let loop ((table table))
(cond ((null? table)
"application/octet-stream")
((member suffix (caar table))
(cadar table))
(else
(loop (cdr table)))))))
(define (run-script out path args)
(let* ((conn (spawn-command path))
(script-in (car conn))
(script-out (cadr conn))
(args (map (lambda (x)
(cons (car x)
(url-decode (cdr x))))
args)))
(if args
(begin (display args script-out)
(newline script-out)
(close-output-port script-out)))
(let loop ((c (read-char script-in)))
(if (not (eof-object? c))
(begin (write-char c out)
(loop (read-char script-in)))))))
(define (serve out url)
(cond ((and (url-suffix url)
(string=? "cgi" (url-suffix url)))
(status out 200)
(run-script out (url-path url) (url-args url)))
(else
(status out 200 (mime-type (url-suffix url)))
(with-input-from-file
(url-path url)
(lambda ()
(let loop ((c (read-char)))
(if (not (eof-object? c))
(begin (write-char c out)
(loop (read-char))))))))))
(define (log-stuff code time peer header)
(let ((tstp (format-time "~w ~4y-~m-~2d ~2h:~2m:~2s"
(unix-time->time time))))
(display* #\" code #\"
#\space
#\" tstp #\"
#\space
#\" (if peer (car peer) "unknown") #\"
#\space
#\" (cadr (string-split #\space (car header))) #\"
#\space
#\" (get-user-agent header) #\"
#\newline)))
(define (http-request out old time peer header)
(let ((request (string-parse " " (car header))))
(cond ((not (<= 2 (length request) 3))
(log-stuff 400 time peer header)
(cant-parse out (string-unsplit #\space request)))
((not (string=? "GET" (car request)))
(log-stuff 400 time peer header)
(cant-parse out (string-unsplit #\space request)))
(else
(let* ((url (split-url (cadr request)))
(_ (set-url-path! url
(string-append "." (url-path url))))
(url (begin
(if (and (sys:stat (url-path url))
(sys:stat-directory? (url-path url)))
(begin (set-url-path!
url
(string-append (url-path url)
"/index.html"))
(set-url-suffix! url "html")))
url)))
(cond ((not (local-path? (url-path url)))
(log-stuff 503 time peer header)
(bug-me-not out))
((file-exists? (url-path url))
(log-stuff 200 time peer header)
(serve out url))
(else
(log-stuff 404 time peer header)
(not-found out (cadr request)))))))))
(define (get-user-agent header)
(let* ((uah "User-Agent: ")
(k (string-length uah)))
(let loop ((h header))
(cond ((null? h) "unidentified")
((and (>= (string-length (car h)) k)
(string-ci=? (substring (car h) 0 k) uah))
(substring (car h) k (string-length (car h))))
(else
(loop (cdr h)))))))
(define (old-request? s)
(let ((s (string-parse " " s)))
(and (= (length s) 2)
(>= (string-length (car s)) 3)
(string=? "GET" (substring (car s) 0 3)))))
(define (handle-request in out peer time delta)
(if (and delta (< delta 1))
(bug-me-not out)
(let loop ((line (read-line in))
(header '()))
(let* ((k (if (eof-object? line)
-1
(- (string-length line) 1)))
(line (if (and (not (negative? k))
(char=? CR (string-ref line k)))
(substring line 0 k)
line)))
(cond ((or (eof-object? line)
(string=? "" line))
(http-request out
#f
time
peer
(reverse header)))
((old-request? line)
(handle-request out
#t
time
peer
(list line)))
(else
(loop (read-line in)
(cons line header))))))))
(define (server)
(let ((args (parse-options! (sys:command-line) options usage)))
(if (opt-val show-help)
(begin (display-usage
`(""
,usage
""
"Hypertext Server"
""
"-m nreq max. requests/second per client (default: 5)"
""))
(sys:exit 0)))
(let ((host (if (null? args)
#t
(car args)))
(port (if (or (null? args)
(null? (cdr args)))
"80"
(cadr args))))
(inet-server host port handle-request (opt-val max-req)))))
(server)
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