1 ;;; Mudsync --- Live hackable MUD
2 ;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
4 ;;; This file is part of Mudsync.
6 ;;; Mudsync is free software; you can redistribute it and/or modify it
7 ;;; under the terms of the GNU General Public License as published by
8 ;;; the Free Software Foundation; either version 3 of the License, or
9 ;;; (at your option) any later version.
11 ;;; Mudsync is distributed in the hope that it will be useful, but
12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ;;; General Public License for more details.
16 ;;; You should have received a copy of the GNU General Public License
17 ;;; along with Mudsync. If not, see <http://www.gnu.org/licenses/>.
19 (define-module (mudsync networking)
20 #:use-module (8sync systems actors)
21 #:use-module (8sync agenda)
22 #:use-module (ice-9 format)
23 #:use-module (ice-9 match)
24 #:use-module (ice-9 rdelim)
25 #:use-module (oop goops)
27 #:export (;; Should we be exporting these?
37 (define %default-server #f)
38 (define %default-port 8889)
40 (define-class <network-manager> (<actor>)
41 (server-socket #:getter nm-server-socket)
42 ;; mapping of client -> client-id
43 (clients #:getter nm-clients
44 #:init-thunk make-hash-table)
45 ;; send input to this actor
46 (send-input-to #:getter nm-send-input-to
47 #:init-keyword #:send-input-to)
51 ((start-listening actor message)
52 (nm-install-socket actor (message-ref message 'server %default-server)
53 (message-ref message 'port %default-port)))
54 ((send-to-client actor message client data)
55 (nm-send-to-client-id actor client data)))))
57 ;;; TODO: We should provide something like this, but this isn't used currently,
58 ;;; and uses old deprecated code (the 8sync-port-remove stuff).
59 ;; (define-method (nm-close-everything (nm <network-manager>) remove-from-agenda)
61 ;; ;; close all clients
65 ;; (if remove-from-agenda
66 ;; (8sync-port-remove client)))
68 ;; ;; reset the clients list
69 ;; (set! (nm-clients) (make-hash-table))
70 ;; ;; close the server
71 ;; (close (nm-server-socket nm))
72 ;; (if remove-from-agenda
73 ;; (8sync-port-remove (nm-server-socket nm))))
75 ;; Maximum number of backlogged connections when we listen
76 (define %maximum-backlog-conns 128) ; same as SOMAXCONN on Linux 2.X,
79 (define (nm-install-socket nm server port)
80 "Install socket on SERVER with PORT"
82 (socket PF_INET ; ipv4
83 SOCK_STREAM ; two-way connection-based byte stream
87 (inet-pton AF_INET server)
90 ;; Totally mimed from the Guile manual. Not sure if we need this, but:
91 ;; http://www.unixguide.net/network/socketfaq/4.5.shtml
92 (setsockopt s SOL_SOCKET SO_REUSEADDR 1) ; reuse port even if port is busy
93 ;; Connecting to a non-specific address:
94 ;; (bind s AF_INET INADDR_ANY port)
95 ;; Should this be an option? Guess I don't know why we'd need it
96 ;; @@: If we wanted to support listening on a particular hostname,
97 ;; could see 8sync's irc.scm...
98 (bind s AF_INET addr port)
99 ;; Listen to connections
100 (listen s %maximum-backlog-conns)
102 ;; Make port non-blocking
103 (fcntl s F_SETFL (logior O_NONBLOCK (fcntl s F_GETFL)))
105 ;; @@: This is used in Guile's http server under the commit:
106 ;; * module/web/server/http.scm (http-open): Ignore SIGPIPE. Keeps the
107 ;; server from dying in some circumstances.
108 ;; (sigaction SIGPIPE SIG_IGN)
109 ;; Will this break other things that use pipes for us though?
111 (slot-set! nm 'server-socket s)
113 (format #t "Listening for clients in pid: ~s\n" (getpid))
115 ;; TODO: set up periodic close of idle connections?
117 ;; (yield) ;; @@: Do we need this?
118 (define client-connection (accept s))
119 (8sync (nm-new-client nm s client-connection))
122 (define (nm-new-client nm s client-connection)
123 "Handle new client coming in to socket S"
124 (define client-details (cdr client-connection))
125 (define client (car client-connection))
126 (define client-id (big-random-number))
127 (format #t "New client: ~s\n" client-details)
128 (format #t "Client address: ~s\n"
130 (sockaddr:addr client-details)))
131 (fcntl client F_SETFL (logior O_NONBLOCK (fcntl client F_GETFL)))
132 (hash-set! (nm-clients nm) client-id client)
133 (<- nm (nm-send-input-to nm) 'new-client #:client client-id)
134 (nm-client-receive-loop nm client client-id))
136 (define (nm-client-receive-loop nm client client-id)
137 "Make a method to receive client data"
139 (define line (read-line client))
140 (if (eof-object? line)
141 (nm-handle-port-eof nm client client-id)
143 (nm-handle-line nm client client-id
144 (string-trim-right line #\return))
148 (define (nm-handle-port-closed nm client client-id)
149 "Handle a closed port"
150 (format #t "DEBUG: handled closed port ~x\n" client-id)
151 (hash-remove! (nm-clients nm) client-id)
152 (<- nm (nm-send-input-to nm) 'client-closed #:client client-id))
154 (define-method (nm-handle-port-eof nm client client-id)
155 "Handle seeing an EOF on port"
156 (format #t "DEBUG: handled eof-object on port ~x\n" client-id)
158 (hash-remove! (nm-clients nm) client-id)
159 (<- nm (nm-send-input-to nm) 'client-closed #:client client-id))
161 (define-method (nm-handle-line nm client client-id line)
162 "Handle an incoming line of input from a client"
163 (<- nm (nm-send-input-to nm) 'client-input
167 (define-method (nm-send-to-client-id nm client-id data)
168 "Send DATA to TO-CLIENT id"
169 (define client-obj (hash-ref (nm-clients nm) client-id))
171 (throw 'no-such-client
172 "Asked to send data to client but that client doesn't exist"
173 #:client-id client-id
175 (display data client-obj))