improved tls support
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parent
0720747d47
commit
8ae4992d1c
1 changed files with 61 additions and 61 deletions
122
comm/xmpp.scm
122
comm/xmpp.scm
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@ -1,6 +1,19 @@
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;;; A basic XMPP library which should conform to RFCs 3920 and 3921
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;;;
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;;; Copyright (C) 2009 FoAM vzw. LGPL.
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;;; Copyright (C) 2009 FoAM vzw.
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;;;
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;;; This package is free software: you can redistribute it and/or
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;;; modify it under the terms of the GNU Lesser General Public
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;;; License as published by the Free Software Foundation, either
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;;; version 3 of the License, or (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Lesser General Public License for more details.
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;;;
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;;; You can find a copy of the GNU Lesser General Public License at
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;;; http://www.gnu.org/licenses/lgpl-3.0.html.
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;;;
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;;; Authors
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;;;
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@ -8,15 +21,15 @@
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;;;
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;;; Requirements
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;;;
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;;; PLT for now.
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;;; PLT for now. TLS requires a version of PLT > 4.1.5.3
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;;;
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;;; Commentary
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;;;
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;;; Still a long way from implementing even a minimal subset of XMPP
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;;;
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;;; features implemented
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;;; - establish plaintext connections on port 5222
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;;; - partial "old sytle" ssl connections on port 5223
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;;; - plaintext sessions on port 5222
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;;; - "old sytle" ssl sessions on port 5223
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;;; - authenticate using an existing account
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;;; - send messages (rfc 3921 sec.4)
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;;; - send presence (rfc 3921 sec.5)
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@ -25,9 +38,9 @@
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;;;
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;;; features to implement
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;;; - account creation
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;;; - managing subscription (rfc 3921 sec.6)
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;;; - managing subscriptions (rfc 3921 sec.6)
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;;; - rosters (rfc 3921 sec.7)
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;;; - plaintext/ssl/tls negotiation (rfc 3920 sec.5 & 6)
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;;; - plaintext/tls/sasl negotiation (rfc 3920 sec.5 & 6)
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;;; - encrypted connections using tls on port 5222
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;;; - correct namespaces in sxml
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;;; - message types
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@ -39,23 +52,21 @@
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;;; - rfc 3920
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;;; - rfc 3921
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;;;
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;;; bugs and/or improvements
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;;; bugs and/or improvements
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;;; - read-async & repsonse-handler
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;;; - ssax:xml->sxml or lazy:xml->sxml
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;;; - default handlers
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;;; - ssl read/write sequence
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;;; - chatbot exmples
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;;;
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(module xmpp scheme
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(provide (all-defined-out)
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;open-connection
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;open-ssl-connection
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;with-xmpp-session
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)
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(require (planet lizorkin/sxml:2:1/sxml))
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(require (planet lizorkin/ssax:2:0/ssax))
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(require mzlib/os)
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@ -72,11 +83,6 @@
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(define port 5222)
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(define ssl-port 5223)
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(define ssl-write-flag #t) ;; semaphore for half-duplex ssl
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(define (ssl-write b)
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(set! ssl-write-flag b))
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(define (open-connection machine port handler)
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(let-values (((in out)
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@ -93,15 +99,13 @@
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(close-input-port in)))
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(define (read-async in)
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(define bstr (make-bytes 0 0))
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(when (byte-ready? in)
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(if (eq? (peek-byte in) eof)
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(break-thread (current-thread))
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(begin
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(set! bstr (bytes-append bstr
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(make-bytes 1 (read-byte in))
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(read-async in)))))) bstr)
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(bytes->string/utf-8 (list->bytes (read-async-bytes in))))
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(define (read-async-bytes in)
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(let ((bstr '()))
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(when (sync/timeout 0 in)
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(set! bstr (cons (read-byte in) (read-async-bytes in)))) bstr))
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(define ssxml srl:sxml->xml-noindent)
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;;;;;; ; ; ; ; ;; ;;;;;; ;
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;; intialization
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(define (xmpp-stream host)
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(string-append "<?xml version='1.0'?><stream:stream xmlns:stream='http://etherx.jabber.org/streams' to='" host "' xmlns='jabber:client'>"))
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;; authentication
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(define (xmpp-auth username password resource)
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(ssxml `(iq (@ (type "set") (id "auth"))
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(username ,username)
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(password ,password)
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(resource ,resource)))))
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(define (xmpp-session host)
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(ssxml `(iq (@ (to ,host) (type "set") (id "session"))
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(session (@ (xmlns "urn:ietf:params:xml:ns:xmpp-session"))))))
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(define (starttls) "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>")
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;; messages
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;; messages
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(define (message to body)
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(ssxml `(message (@ (to ,to)) (body ,body))))
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;; presence
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(define (presence #:from (from "")
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#:to (to "")
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@ -156,19 +160,19 @@
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(define message-type (sxpath-element "message/@type/text()"))
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(define message-body (sxpath-element "message/body/text()"))
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(define message-subject (sxpath-element "message/subject/text()"))
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;; info/query
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(define iq-type (sxpath-element "iq/@type/text()"))
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(define iq-id (sxpath-element "iq/@id/text()"))
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(define iq-error-type (sxpath-element "iq/error/@type/text()"))
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(define iq-error-text (sxpath-element "iq/error/text()"))
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(define iq-error (sxpath-element "iq/error"))
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;; presence
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(define presence-show (sxpath-element "presence/show/text()"))
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(define presence-from (sxpath-element "presence/@from/text()"))
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(define presence-status (sxpath-element "presence/status/text()"))
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;;;;;;;;; ; ;; ; ; ;; ;; ; ;
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;;
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;;;;;; ;; ; ; ;; ;
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(define xmpp-handlers (make-hash)) ;; a hash of tags and functions (possibly extend to using sxpaths)
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(define (set-xmpp-handler type fcn)
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(dict-set! xmpp-handlers type fcn))
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(when fcn (begin
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(display (format "attempting to run handler ~a.~%" fcn))
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(fcn sz)))))
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;; no real parsing yet. dispatches any received xml stanzas as sxml
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(define (parse-xmpp-response str)
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(when (> (string-length str) 0)
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(newline)
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(let ((sz (ssax:xml->sxml (open-input-string (clean str)) '())))
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;;(let ((sz (lazy:xml->sxml (open-input-string str) '())))
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(cond
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;; example handlers to print stanzas or their contents
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(define (print-message sz)
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(display (format "a ~a message from ~a which says '~a.'~%" (message-type sz) (message-from sz) (message-body sz))))
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(define (print-iq sz)
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(display (format "an iq response of type '~a' with id '~a.'~%" (iq-type sz) (iq-id sz))))
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(display (format "an iq response of type '~a' with id '~a.'~%" (iq-type sz) (iq-id sz))))
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(define (print-presence sz)
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(display (format " p-r-e-s-e-n-e-c--> ~a is ~a" (presence-from sz) (presence-status))))
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;; QND hack to filter out anything not a message, iq or presence
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(define (clean str)
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(let ((test (substring str 0 3)))
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(cond ((string-ci=? test "<me") str)
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((string-ci=? test "<iq") str)
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((string-ci=? test "<pr") str)
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(else "<null/>"))))
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;; repsonse handler
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(cond ((string-ci=? test "<me") str)
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((string-ci=? test "<iq") str)
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((string-ci=? test "<pr") str)
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(else "<null/>"))))
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;; response handler
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(define (xmpp-response-handler in)
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(thread (lambda ()
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(let loop ()
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(when ssl-write-flag
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(parse-xmpp-response (bytes->string/utf-8 (read-async in))))
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(sleep 0.1)
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(parse-xmpp-response (read-async in))
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(sleep 0.1) ;; slight delay to avoid a tight loop
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(loop)))))
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;; ideally something like this would work.. .
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(define (xmmp-read-stanza in)
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(parse-xmpp-response (read-line in)))
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;; jid splicing (assuming the jid is in the format user@host/resource)
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(define (jid-user jid)
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(string-take jid (string-index jid #\@)))
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(define (jid-host jid)
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(let* ((s (string-take-right jid (- (string-length jid) (string-index jid #\@) 1)))
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(v (string-index s #\/)))
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(if v (string-take s v) s )))
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(define (jid-resource jid)
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(let ((r (jid-resource-0 jid)))
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(if (void? r) (gethostname) r)))
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(define (jid-resource-0 jid)
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(let ((v (string-index jid #\/)))
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(when v (string-take-right jid (- (string-length jid) v 1)))))
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;;;; ;; ; ; ;; ;; ;;;; ;
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;;
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;; interfaces
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;;
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;;;;; ;; ;;;; ; ;; ;
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(defmacro with-xmpp-session (jid pass . body)
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`(let ((host (jid-host ,jid))
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(user (jid-user ,jid))
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(resource (jid-resource ,jid)))
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(let-values (((in out)
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;;(ssl-connect host ssl-port 'tls)))
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(tcp-connect host port)))
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(define (send str) (fprintf out "~A~%" str))
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(ssl-connect host ssl-port 'tls)))
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;;(tcp-connect host port)))
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(define (send str) (fprintf out "~A~%" str) (flush-output out))
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(file-stream-buffer-mode out 'line)
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(xmpp-response-handler in)
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(send (xmpp-stream host))
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;(send starttls)
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(send (xmpp-auth user ,pass resource))
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(send (presence))
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(send (presence #:status "Available"))
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(send (presence #:status "Available"))
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,@body
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(close-output-port out)
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(close-input-port in))))
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) ;; end module
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) ;; end module
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