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)
50 #:allocation #:each-subclass
54 (lambda* (actor message
55 #:key (server %default-server)
57 (nm-install-socket actor server port)))
59 (lambda* (actor message #:key client data)
60 (nm-send-to-client-id actor client data))))))
62 ;;; TODO: We should provide something like this, but this isn't used currently,
63 ;;; and uses old deprecated code (the 8sync-port-remove stuff).
64 ;; (define-method (nm-close-everything (nm <network-manager>) remove-from-agenda)
66 ;; ;; close all clients
70 ;; (if remove-from-agenda
71 ;; (8sync-port-remove client)))
73 ;; ;; reset the clients list
74 ;; (set! (nm-clients) (make-hash-table))
75 ;; ;; close the server
76 ;; (close (nm-server-socket nm))
77 ;; (if remove-from-agenda
78 ;; (8sync-port-remove (nm-server-socket nm))))
80 ;; Maximum number of backlogged connections when we listen
81 (define %maximum-backlog-conns 128) ; same as SOMAXCONN on Linux 2.X,
84 (define (nm-install-socket nm server port)
85 "Install socket on SERVER with PORT"
87 (socket PF_INET ; ipv4
88 SOCK_STREAM ; two-way connection-based byte stream
92 (inet-pton AF_INET server)
95 ;; Totally mimed from the Guile manual. Not sure if we need this, but:
96 ;; http://www.unixguide.net/network/socketfaq/4.5.shtml
97 (setsockopt s SOL_SOCKET SO_REUSEADDR 1) ; reuse port even if port is busy
98 ;; Connecting to a non-specific address:
99 ;; (bind s AF_INET INADDR_ANY port)
100 ;; Should this be an option? Guess I don't know why we'd need it
101 ;; @@: If we wanted to support listening on a particular hostname,
102 ;; could see 8sync's irc.scm...
103 (bind s AF_INET addr port)
104 ;; Listen to connections
105 (listen s %maximum-backlog-conns)
107 ;; Make port non-blocking
108 (fcntl s F_SETFL (logior O_NONBLOCK (fcntl s F_GETFL)))
110 ;; @@: This is used in Guile's http server under the commit:
111 ;; * module/web/server/http.scm (http-open): Ignore SIGPIPE. Keeps the
112 ;; server from dying in some circumstances.
113 ;; (sigaction SIGPIPE SIG_IGN)
114 ;; Will this break other things that use pipes for us though?
116 (slot-set! nm 'server-socket s)
118 (format #t "Listening for clients in pid: ~s\n" (getpid))
120 ;; TODO: set up periodic close of idle connections?
122 ;; (yield) ;; @@: Do we need this?
123 (define client-connection (accept s))
124 (8sync (nm-new-client nm s client-connection))
127 (define (nm-new-client nm s client-connection)
128 "Handle new client coming in to socket S"
129 (define client-details (cdr client-connection))
130 (define client (car client-connection))
131 (define client-id (big-random-number))
132 (format #t "New client: ~s\n" client-details)
133 (format #t "Client address: ~s\n"
135 (sockaddr:addr client-details)))
136 (fcntl client F_SETFL (logior O_NONBLOCK (fcntl client F_GETFL)))
137 (hash-set! (nm-clients nm) client-id client)
138 (<- nm (nm-send-input-to nm) 'new-client #:client client-id)
139 (nm-client-receive-loop nm client client-id))
141 (define (nm-client-receive-loop nm client client-id)
142 "Make a method to receive client data"
144 (define line (read-line client))
145 (if (eof-object? line)
146 (nm-handle-port-eof nm client client-id)
148 (nm-handle-line nm client client-id
149 (string-trim-right line #\return))
153 (define (nm-handle-port-closed nm client client-id)
154 "Handle a closed port"
155 (format #t "DEBUG: handled closed port ~x\n" client-id)
156 (hash-remove! (nm-clients nm) client-id)
157 (<- nm (nm-send-input-to nm) 'client-closed #:client client-id))
159 (define-method (nm-handle-port-eof nm client client-id)
160 "Handle seeing an EOF on port"
161 (format #t "DEBUG: handled eof-object on port ~x\n" client-id)
163 (hash-remove! (nm-clients nm) client-id)
164 (<- nm (nm-send-input-to nm) 'client-closed #:client client-id))
166 (define-method (nm-handle-line nm client client-id line)
167 "Handle an incoming line of input from a client"
168 (<- nm (nm-send-input-to nm) 'client-input
172 (define-method (nm-send-to-client-id nm client-id data)
173 "Send DATA to TO-CLIENT id"
174 (define client-obj (hash-ref (nm-clients nm) client-id))
176 (throw 'no-such-client
177 "Asked to send data to client but that client doesn't exist"
178 #:client-id client-id
180 (display data client-obj))