sunet/httpd-core.scm

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;;; http server in the Scheme Shell -*- Scheme -*-
;;; Olin Shivers <shivers@lcs.mit.edu>
;;; Copyright (c) 1994 by Brian D. Carlstrom and Olin Shivers.
;;; Problems:
;;; Need to html-quote URI's when printing them out to HTML text.
;;; This file implements the core of an HTTP server: code to establish
;;; net connections, read and parse requests, and handler errors.
;;; It does not have the code to actually handle requests. That's up
;;; to other modules, and could vary from server to server. To build
;;; a complete server, you need to define path handlers (see below) --
;;; they determine how requests are to be handled.
;;;
;;; A draft document detailing the HTTP 1.0 protocol can be found at
;;; http://www.w3.org/hypertext/WWW/Protocols/HTTP1.0/
;;; draft-ietf-http-spec.html
;;; Imports and non-R4RS'isms
;;; \r \n in strings for cr and lf.
;;; receive values (MV return)
;;; scsh system calls
;;; rfc822 header parsing
;;; crlf-io (read cr/lf terminated lines)
;;; when, unless, switch, ? (conditionals)
;;; uri, url packages
;;; defrec package (record structures)
;;; defenum (enumerated types)
;;; ignore-errors (HANDLE package)
;;; string hacking stuff
;;; char-set stuff
;;; format (Formatted output)
;;; httpd error stuff
;;; condition-stuff (S48 error conditions)
;;; Constants
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define server/version "Scheme-Underground/1.0")
(define server/protocol "HTTP/1.0")
; default: no logging
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; initialized by init-http-log!
(define http-log (lambda a #f)) ; makes logging in CLF
(define http-syslog (lambda a #f)) ; makes syslog
(define *http-syslog?* #f) ; trigger used to avoid
; unnecessary computations
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(define (init-http-log! options)
(init-http-port-log! (httpd-options-logfile options))
(init-http-syslog! (httpd-options-syslog? options)))
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(define (init-http-port-log! logfile)
(let ((logport
(cond
((string? logfile) ; try to open logfile for appending (output)
(call-with-current-continuation
(lambda (exit)
(with-errno-handler*
(lambda (errno packet)
(format (current-error-port)
"[httpd] Warning: An error occured while opening ~S for writing (~A).
Logging now to stderr.~%"
logfile
(car packet))
(exit (current-error-port)))
(lambda ()
(open-output-file logfile
(bitwise-ior open/create open/append)))))))
((output-port? logfile) ; we were given an output port, so let's use it
logfile)
((eq? logfile #f) ; no logging demanded
#f)
; unexpected value of logfile; we'll use (current-error-port) instead
(else
(format (current-error-port)
"[httpd] Warning: Logfile was not specified correctly (given: ~S).~%
Logging now to stderr.\n"
logfile)
(current-error-port)))))
(if logfile ; if logging was specified, set up the logger
(set! http-log (make-http-log-proc logport)))))
; alternative-clause: default values of *http-syslog?* and http-log
(define (init-http-syslog! syslog?)
(if syslog?
(let ((http-syslog-lock (make-lock)))
(set! *http-syslog?* #t)
(set! http-syslog
(lambda (level fmt . args)
(obtain-lock http-syslog-lock)
(syslog level
(apply format #f fmt args))
(release-lock http-syslog-lock))))))
(define (make-http-log-proc http-log-port)
(let ((http-log-lock (make-lock)))
; (display "--- MARK (server started) ---\n" http-log-port)
(lambda (req reply-code)
(if req
(begin
(obtain-lock http-log-lock)
(display (make-CLF
(receive (host-address _)
(socket-address->internet-address
(socket-remote-address (request:socket req)))
(format-internet-host-address host-address))
(request:method req) ; request method
(uri-path-list->path
(http-url:path (request:url req))) ; requested file
(version->string (request:version req)) ; protocol version
reply-code
23 ; filesize (unknown)
(get-header (request:headers req) 'referer)
(get-header (request:headers req) 'user-agent))
http-log-port)
(force-output http-log-port)
(release-lock http-log-lock))))))
; returns a string for a CLF entry (Common Log Format)
; note: till now, we do not log the user's time zone code
(define (make-CLF remote-ip request-type requested-file protocol http-code filesize referer user-agent)
(format #f "~A - - ~A ~S ~A ~A ~S ~S~%"
(or remote-ip "-")
(format-date "[~d/~b/~Y:~H:~M:~S +0000]" (date)) ; +0000 as we don't know
(string-join (list request-type requested-file protocol))
; Unfortunately, we first split the request line into
; method/request-type etc. and put it together here.
; Files conform to CLF are expected to print the original line.
(or http-code "-")
(or filesize "-")
(if (string? referer) (string-trim referer char-set:whitespace) "")
(if (string? user-agent)
(string-trim user-agent char-set:whitespace)
"")))
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;;; (httpd options)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; The server top-level. PATH-HANDLER is the top-level request path handler --
;;; the procedure that actually deals with the request.
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(define (httpd options)
(let ((port (httpd-options-port options))
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(root-dir (httpd-options-root-directory options))
(rate-limiter
(cond
((httpd-options-simultaneous-requests options)
=> make-rate-limiter)
(else #f))))
(init-http-log! options)
(with-syslog-destination
"httpd" #f #f #f
(lambda ()
(with-cwd
root-dir
(bind-listen-accept-loop
protocol-family/internet
;; Why is the output socket unbuffered? So that if the client
;; closes the connection, we won't lose when we try to close the
;; socket by trying to flush the output buffer.
(lambda (sock addr)
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(if rate-limiter
(begin
(rate-limit-block rate-limiter)
(rate-limit-open rate-limiter)))
(with-fatal-error-handler
(lambda (c decline)
(http-syslog (syslog-level notice) "error during connection negotiation~%")
(if rate-limiter
(rate-limit-close rate-limiter)))
(call-with-values
(lambda ()
(socket-address->internet-address (socket-remote-address sock)))
(lambda (host-address service-port)
(if (and rate-limiter *http-syslog?*)
(http-syslog (syslog-level info) "<~a>~a: concurrent request #~a~%"
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(pid)
(format-internet-host-address host-address)
(rate-limiter-current-requests rate-limiter)))
(set-port-buffering (socket:outport sock) bufpol/none) ; No buffering
(fork-thread
(lambda ()
(with-current-input-port
(socket:inport sock)
(with-current-output-port
(socket:outport sock)
(set-port-buffering (current-input-port) bufpol/none)
(process-toplevel-request sock host-address options)))
(if *http-syslog?*
(http-syslog (syslog-level debug) "<~a>~a [closing]~%"
(pid)
(format-internet-host-address host-address)))
(with-fatal-error-handler
(lambda (c decline)
(if *http-syslog?*
(http-syslog (syslog-level notice) "<~a>~a [error closing (~a)]~%"
(pid)
(format-internet-host-address host-address)
c)))
(close-socket sock))
(if rate-limiter
(rate-limit-close rate-limiter))
(if *http-syslog?*
(http-syslog (syslog-level info) "<~a>~a [closed]~%"
(pid)
(format-internet-host-address host-address)))))))))
port))))))
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;;; Top-level http request processor
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Read, parse, and handle a single http request. The only thing that makes
;;; this complicated is handling errors -- as a server, we can't just let the
;;; standard error handlers toss us into a breakpoint. We have to catch the
;;; error, send an error reply back to the client if we can, and then keep
;;; on trucking. This means using the S48's condition system to catch and
;;; handle the various errors, which introduces a major point of R4RS
;;; incompatibiliy -- R4RS has no exception system. So if you were to port
;;; this code to some other Scheme, you'd really have to sit down and think
;;; about this issue for a minute.
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(define (process-toplevel-request sock host-address options)
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;; This top-level error-handler catches *all* uncaught errors and warnings.
;; If the error condition is a reportable HTTP error, we send a reply back
;; to the client. In any event, we abort the transaction, and return from
;; PROCESS-TOPLEVEL-REQUEST.
;;
;; We *oughta* map non-http-errors into replies anyway.
(with-fatal-error-handler (lambda (c decline) ; No call to decline
(http-syslog (syslog-level notice) "<~a>~a: error: ~s~%"
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(pid)
(format-internet-host-address host-address)
c)
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(if (http-error? c) ; -- we handle all.
(apply (lambda (reply-code req . args)
(apply send-http-error-reply
reply-code req options
args))
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(condition-stuff c))
(with-fatal-error-handler
(lambda (c decline)
(http-syslog (syslog-level notice) "<~a>~a [error shutting down: ~s]~%"
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(pid)
(format-internet-host-address host-address)
c))
(shutdown-socket sock shutdown/sends+receives)
(http-syslog (syslog-level info) "<~a>~a [shut down]~%"
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(pid)
(format-internet-host-address host-address)))))
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(let ((req (with-fatal-error-handler ; Map syntax errors
(lambda (c decline) ; to http errors.
(if (fatal-syntax-error? c)
(apply http-error http-reply/bad-request
#f ; No request yet.
"Request parsing error -- report to client maintainer."
(condition-stuff c))
(decline))) ; Actual work:
(parse-http-request sock options))) ; (1) Parse request.
(handler
(httpd-options-path-handler options)))
(handler (cdr (http-url:path (request:url req))) req) ; (2) Deal with it. (skip initial "/")
(http-log req http-reply/ok))))
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;;;; HTTP request parsing
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;; This code defines the http REQUEST data structure, and provides
;;;; code to read requests from an input port.
(define-record request
method ; A string such as "GET", "PUT", etc.
uri ; The escaped URI string as read from request line.
url ; An http URL record (see url.scm).
version ; A (major . minor) integer pair.
headers ; An rfc822 header alist (see rfc822.scm).
socket) ; The socket connected to the client.
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(define-record-discloser type/request
(lambda (req)
(list 'request
(request:method req)
(request:uri req)
(request:url req)
(request:version req)
(request:headers req)
(request:socket req))))
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;;; A http protocol version is an integer pair: (major . minor).
(define (version< v1 v2)
(or (< (car v1) (car v2))
(and (= (car v1) (car v2))
(< (cdr v1) (cdr v2)))))
(define (version<= v1 v2) (not (version< v2 v1)))
(define (v0.9-request? req)
(version<= (request:version req) '(0 . 9)))
(define (version->string v)
(string-append "HTTP/"
(number->string (car v))
"."
(number->string (cdr v))))
;;; Read and parse an http request from INPORT.
;;;
;;; Note: this parser parses the URI into an http URL record. If the URI
;;; isn't an http URL, the parser fails. This may not be right. There's
;;; nothing in the http protocol to prevent you from passing a non-http
;;; URI -- what this would mean, however, is not clear. Like so much of
;;; the Web, the protocols are redundant, underconstrained, and ill-specified.
(define (parse-http-request sock options)
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(let ((line (read-crlf-line)))
; (display line (current-error-port)) (newline (current-error-port))
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;; Blat out some logging info.
(if *http-syslog?*
(call-with-values
(lambda ()
(socket-address->internet-address (socket-remote-address sock)))
(lambda (host-address service-port)
(http-syslog (syslog-level info) "<~a>~a: ~a~%"
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(pid)
(format-internet-host-address host-address)
line))))
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(if (eof-object? line)
(fatal-syntax-error "EOF while parsing request.")
(let* ((elts (string->words line)) ; Split at white-space.
(version (case (length elts)
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((2) '(0 . 9))
((3) (parse-http-version (caddr elts)))
(else (fatal-syntax-error "Bad HTTP version.")))))
(let* ((meth (car elts))
(uri-string (cadr elts))
(url (parse-http-servers-url-fragment uri-string sock options))
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(headers (if (equal? version '(0 . 9)) '()
(read-rfc822-headers))))
(make-request meth uri-string url version headers sock))))))
;;; Parse the URL, but if it begins without the "http://host:port" prefix,
;;; interpolate one from SOCKET. It would sleazier but faster if we just
;;; computed the default host and port at server-startup time, instead of
;;; on every request.
(define (parse-http-servers-url-fragment uri-string socket options)
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(receive (scheme path search frag-id) (parse-uri uri-string)
(if frag-id ; Can't have a #frag part.
(fatal-syntax-error "HTTP URL contains illegal #<fragment> suffix."
uri-string)
(if scheme
(if (string-ci=? scheme "http") ; Better be an http url.
(parse-http-url path search #f)
(fatal-syntax-error "Non-HTTP URL" uri-string))
;; Interpolate the userhost struct from our net connection.
(if (and (pair? path) (string=? (car path) ""))
(let* ((addr (socket-local-address socket))
(local-name (my-reported-fqdn addr options))
(portnum (my-reported-port addr options)))
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(make-http-url (make-userhost #f #f
local-name
(number->string portnum))
(map unescape-uri path) ; DON'T Skip initial /.
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search
#f))
(fatal-syntax-error "Path fragment must begin with slash"
uri-string))))))
(define parse-http-version
(let ((re (make-regexp "^HTTP/([0-9]+)\\.([0-9]+)$"))
(lose (lambda (s) (fatal-syntax-error "Bad HTTP version" s))))
(lambda (vstring)
(let ((m (regexp-exec re vstring)))
(if m
(cons (or (string->number (match:substring m 1) 10) (lose vstring))
(or (string->number (match:substring m 2) 10) (lose vstring)))
(lose vstring))))))
;;; Split string into a list of whitespace-separated strings.
;;; This could have been trivially defined in scsh as (field-splitter " \t\n")
;;; but I hand-coded it because it's short, and I didn't want invoke the
;;; regexp machinery for something so simple.
(define non-whitespace (char-set-complement char-set:whitespace))
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(define (string->words s)
(let recur ((start 0))
(cond ((string-index s non-whitespace start) =>
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(lambda (start)
(cond ((string-index s char-set:whitespace start) =>
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(lambda (end)
(cons (substring s start end)
(recur end))))
(else (list (substring s start (string-length s)))))))
(else '()))))
;;;; Sending replies
;;;;;;;;;;;;;;;;;;;;
;;; Reply codes
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; (define http-reply/ok 200), etc.
;;; Also, build an alist HTTP-REPLY-TEXT-TABLE mapping integer reply codes
;;; to their diagnostic text messages.
(define-syntax define-http-reply-codes
(syntax-rules ()
((define-http-reply-codes table set (name val msg) ...)
(begin (define table '((val . msg) ...))
(define-enum-constant set name val)
...))))
(define-http-reply-codes http-reply-text-table http-reply
(ok 200 "OK")
(created 201 "Created")
(accepted 202 "Accepted")
(prov-info 203 "Provisional Information")
(no-content 204 "No Content")
(mult-choice 300 "Multiple Choices")
(moved-perm 301 "Moved Permanently")
(moved-temp 302 "Moved Temporarily")
(method 303 "Method (obsolete)")
(not-mod 304 "Not Modified")
(bad-request 400 "Bad Request")
(unauthorized 401 "Unauthorized")
(payment-req 402 "Payment Required")
(forbidden 403 "Forbidden")
(not-found 404 "Not Found")
(method-not-allowed 405 "Method Not Allowed")
(none-acceptable 406 "None Acceptable")
(proxy-auth-required 407 "Proxy Authentication Required")
(timeout 408 "Request Timeout")
(conflict 409 "Conflict")
(gone 410 "Gone")
(internal-error 500 "Internal Server Error")
(not-implemented 501 "Not Implemented")
(bad-gateway 502 "Bad Gateway")
(service-unavailable 503 "Service Unavailable")
(gateway-timeout 504 "Gateway Timeout"))
(define (reply-code->text code)
(cdr (assv code http-reply-text-table)))
;;; Text generation utilities.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define (time->http-date-string time)
(format-date "~A, ~d-~b-~y ~H:~M:~S GMT" (date time 0)))
;;; Output the first chunk of a reply header.
(define (begin-http-header out reply-code)
(format out "~A ~d ~A\r~%"
server/protocol reply-code (reply-code->text reply-code))
(format out "Date: ~A\r~%" (time->http-date-string (time)))
(format out "Server: ~A\r~%" server/version))
(define (title-html out message new-protocol?)
(if new-protocol? (write-crlf out)) ; Separate html from headers.
(format out "<HEAD>~%<TITLE>~%~A~%</TITLE>~%</HEAD>~%~%" message)
(format out "<BODY>~%<H1>~A</H1>~%" message))
;;; (send-http-error-reply reply-code req options [message . extras])
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; Take an http-error condition, and format it into a reply to the client.
;;;
;;; As a special case, request REQ is allowed to be #f, meaning we haven't
;;; even had a chance to parse and construct the request. This is only used
;;; for 400 BAD-REQUEST error report, and we make minimal assumptions in this
;;; case (0.9 protocol for the reply, for example). I might be better off
;;; writing a special-case procedure for that case...
;;; SEND-HTTP-ERROR-REPLY is called from error handlers, so to avoid
;;; infinite looping, if an error occurs while it is running, we just
;;; silently return. (We no longer need to do this; I have changed
;;; WITH-FATAL-ERROR-HANDLER* so that this is not necessary, but I'll
;;; leave it in to play it safe.)
(define (send-http-error-reply reply-code req options . args)
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(ignore-errors (lambda () ; Ignore errors -- see note above.
(apply really-send-http-error-reply reply-code req options args))))
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(define (really-send-http-error-reply reply-code req options . args)
(http-log req reply-code)
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(let* ((message (if (pair? args) (car args)))
(extras (if (pair? args) (cdr args) '()))
(new-protocol? (and req (not (v0.9-request? req)))) ; 1.0 or better?
;; Is it OK to send back an HTML body explaining things?
(html-ok? (or (not req)
(not (string=? (request:method req) "HEAD"))))
(out (current-output-port))
(generic-title (lambda ()
(title-html out
(reply-code->text reply-code)
new-protocol?)))
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(do-msg (lambda () (cond (message (display message out) (newline out))))))
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(if new-protocol? (begin-http-header out reply-code))
;; Don't output the blank line, as individual clauses might
;; want to add more headers.
(if html-ok? (write-string "Content-type: text/html\r\n" out))
;; If html-ok?, we must send back some html, with the <body> tag unclosed.
(cond
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;; This error reply requires two args: message is the new URI: field,
;; and the first EXTRA is the older Location: field.
((or (= reply-code http-reply/moved-temp)
(= reply-code http-reply/moved-perm))
(if new-protocol?
(begin
(format out "URI: ~A\r~%" message)
(format out "Location: ~A\r~%" (car extras))))
(if html-ok?
(begin
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(title-html out "Document moved" new-protocol?)
(format out
"This document has ~A moved to a <A HREF=\"~A\">new location</A>.~%"
(if (= reply-code http-reply/moved-temp) "temporarily" "permanently")
message))))
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((= reply-code http-reply/bad-request)
(if html-ok?
(begin
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(generic-title)
(write-string "<P>Client sent a query that this server could not understand.\n"
out)
(if message (format out "<BR>~%Reason: ~A~%" message)))))
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((= reply-code http-reply/unauthorized)
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(if new-protocol?
(format out "WWW-Authenticate: ~A\r~%\r~%" message)) ; Vas is das?
(if html-ok?
(begin
(title-html out "Authorization Required" new-protocol?)
(write-string "<P>Browser not authentication-capable or\n" out)
(write-string "authentication failed.\n" out)
(if message (format out "~a~%" message)))))
((= reply-code http-reply/forbidden)
(if (not html-ok?)
(begin
(title-html out "Request not allowed." new-protocol?)
(format out
"Your client does not have permission to perform a ~A~%"
(request:method req))
(format out "operation on url ~a.~%" (request:uri req))
(if message (format out "<P>~%~a~%" message)))))
((= reply-code http-reply/not-found)
(if html-ok?
(begin
(title-html out "URL not found" new-protocol?)
(write-string
"<P>The requested URL was not found on this server.\n"
out)
(if message (format out "<P>~%~a~%" message)))))
((= reply-code http-reply/internal-error)
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(format (current-error-port) "ERROR: ~A~%" message)
(http-syslog (syslog-level error) "internal-error: ~A" message)
(if html-ok?
(begin
(generic-title)
(format out "The server encountered an internal error or
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misconfiguration and was unable to complete your request.
<P>
Please inform the server administrator, ~A, of the circumstances leading to
the error, and time it occured.~%"
(httpd-options-server-admin options))
(if message (format out "<P>~%~a~%" message)))))
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((= reply-code http-reply/not-implemented)
(if html-ok?
(begin
(generic-title)
(format out "This server does not currently implement
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the requested method (~A).~%"
(request:method req))
(if message (format out "<P>~a~%" message)))))
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(else
(http-syslog (syslog-level info) "Skipping unhandled reply code ~A.~%" reply-code)
(if html-ok? (generic-title))))
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(cond
(html-ok?
;; Output extra stuff and close the <body> tag.
(for-each (lambda (x) (format out "<BR>~s~%" x)) extras)
(write-string "</BODY>\n" out)))
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; (force-output out) ;;; TODO check this
; (flush-all-ports)
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(force-output out)
; (if bkp? (breakpoint "http error"))
))
;;; Return my Internet host name (my fully-qualified domain name).
;;; This works only if an actual resolver is behind host-info.
;;;
;;; On systems that do DNS via NIS/Yellow Pages, you only get an
;;; unqualified hostname. Also, in case of aliased names, you just
;;; might get the wrong one. Furthermore, you may get screwed in the
;;; presence of a server accelerator such as Squid.
(define *fqdn-cache* #f)
(define (my-reported-fqdn addr options)
(or *fqdn-cache*
(begin
(set! *fqdn-cache* (or (httpd-options-fqdn options)
(host-info:name (host-info addr))))
*fqdn-cache*)))
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(define (my-reported-port addr options)
(or (httpd-options-reported-port options)
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(receive (ip-addr portnum) (socket-address->internet-address addr)
portnum)))