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dfa6197c FT |
1 | ;;;; COMMON-NET -- Abstract networking library |
2 | ||
3 | (eval-when (:compile-toplevel :load-toplevel :execute) | |
4 | (unless (find-package :common-net) | |
5 | (defpackage :common-net | |
6 | (:nicknames :net) | |
7 | (:use :cl)))) | |
8 | (in-package :common-net) | |
9 | ||
10 | ;;; General declarations | |
11 | ||
dfa6197c FT |
12 | (defclass address () ()) |
13 | ||
14 | (defclass host-address (address) ()) | |
15 | ||
16 | (defclass inet-address (address) ()) | |
17 | ||
18 | (defclass inet-host-address (inet-address host-address) ()) | |
19 | ||
20 | (defgeneric format-address (address)) | |
21 | (defgeneric connect-to-address (target &key local)) | |
22 | (defgeneric bind-to-address (address)) | |
23 | (defgeneric close-socket (socket)) | |
24 | (defgeneric socket-open-p (socket)) | |
25 | (defgeneric socket-local-address (socket)) | |
26 | (defgeneric socket-remote-address (socket)) | |
27 | ||
28 | (defclass socket () ()) | |
29 | (defclass listen-socket (socket) ()) | |
30 | (defclass stream-socket (socket) ; Gray stream superclasses are added for implementations that support it. | |
31 | ((mode :initform :byte) | |
32 | (byte-buffer :initform (make-array '(16) :element-type '(unsigned-byte 8) :adjustable t) | |
33 | :type (array (unsigned-byte 8))) | |
34 | (byte-read-pos :initform 0 :type integer) | |
35 | (byte-write-pos :initform 0 :type integer) | |
36 | (char-buffer :initform (make-array '(16) :element-type 'character :adjustable t :fill-pointer 0) | |
37 | :type (array character)) | |
38 | (char-read-pos :initform 0 :type integer) | |
39 | encoder decoder)) | |
40 | (defclass datagram-socket (socket) ()) | |
41 | ||
42 | (defgeneric accept (socket)) | |
43 | (defgeneric socket-send (socket data &key start end no-hang)) | |
44 | (defgeneric socket-send-to (socket data dest &key start end from no-hang)) | |
45 | (defgeneric socket-recv-into (socket buf &key start end no-hang)) | |
46 | (defgeneric socket-recv (socket &key no-hang max-len)) | |
47 | ||
48 | (defgeneric stream-socket-mode (socket)) | |
49 | (defgeneric stream-socket-decode-characters (socket charset)) | |
50 | ||
51 | (defmethod socket-recv ((socket socket) &key no-hang (max-len 65536)) | |
52 | (let ((buf (make-array (list max-len) :element-type '(unsigned-byte 8)))) | |
53 | (multiple-value-bind (len from to) | |
54 | (socket-recv-into socket buf :no-hang no-hang) | |
55 | (if (null len) | |
56 | (values nil nil nil) | |
57 | (values (subseq buf 0 len) from to))))) | |
58 | ||
dfa6197c FT |
59 | (defmethod print-object ((address address) stream) |
60 | (if *print-escape* | |
61 | (format stream "#<~S ~A>" (class-name (class-of address)) (format-address address)) | |
62 | (princ (format-address address) stream)) | |
63 | address) | |
64 | ||
65 | (export '(address host-address inet-address inet-host-address | |
bdc87fbb | 66 | format-address |
dfa6197c FT |
67 | connect-to-address bind-to-address close-socket |
68 | socket-local-address socket-remote-address | |
69 | accept socket-send socket-send-to socket-recv-into socket-recv)) | |
70 | ||
dfa6197c FT |
71 | (defmethod stream-socket-mode ((socket stream-socket)) |
72 | (slot-value socket 'mode)) | |
73 | ||
74 | (defmethod stream-socket-decode-characters ((socket stream-socket) charset) | |
75 | (unless (eq (stream-socket-mode socket) :byte) | |
76 | (simple-socket-error socket "~S is already in character-decoding mode." socket)) | |
77 | (setf (slot-value socket 'encoder) (charcode:make-encoder charset) | |
78 | (slot-value socket 'decoder) (charcode:make-decoder charset) | |
79 | (slot-value socket 'mode) :character)) | |
80 | ||
81 | ;;; Utility macros | |
82 | ||
83 | (defmacro with-open-socket ((var socket) &body body) | |
84 | (let ((sk (gensym))) | |
85 | `(let* ((,sk ,socket) | |
86 | (,var ,sk)) | |
87 | (unwind-protect (locally ,@body) | |
88 | (close-socket ,sk))))) | |
89 | ||
90 | (defmacro with-connection ((var target &key local charset) &body body) | |
91 | `(with-open-socket (,var (connect-to-address ,target :local ,local)) | |
92 | ,@(when charset (list `(stream-socket-decode-characters ,var ,charset))) | |
93 | ,@body)) | |
94 | ||
95 | (defmacro with-bound-socket ((var address) &body body) | |
96 | `(with-open-socket (,var (bind-to-address ,address)) | |
97 | ,@body)) | |
98 | ||
99 | (export '(with-open-socket with-connection with-bound-socket)) | |
100 | ||
101 | ;;; Common condition types | |
102 | ||
103 | (define-condition socket-condition (condition) | |
104 | ((socket :initarg :socket :type socket))) | |
105 | ||
106 | (define-condition address-busy (error) | |
107 | ((address :initarg :address :type address)) | |
108 | (:report (lambda (c s) | |
109 | (format s "The address ~A is busy." (format-address (slot-value c 'address)))))) | |
110 | ||
111 | (define-condition connection-refused (error) | |
112 | ((address :initarg :address :type address)) | |
113 | (:report (lambda (c s) | |
114 | (format s "Connection to ~A was refused by the remote host." (format-address (slot-value c 'address)))))) | |
115 | ||
116 | (define-condition socket-closed (error socket-condition) () | |
117 | (:report (lambda (c s) | |
118 | (format s "The socket ~S is closed." (slot-value c 'socket))))) | |
119 | ||
120 | (define-condition socket-disconnected (socket-closed) () | |
121 | (:report (lambda (c s) | |
122 | (format s "The socket ~S has been closed from the other side." (slot-value c 'socket))))) | |
123 | ||
124 | (define-condition simple-socket-error (simple-error socket-condition) ()) | |
125 | ||
126 | (defun simple-socket-error (socket format &rest args) | |
127 | (error 'simple-socket-error :socket socket :format-control format :format-arguments args)) | |
128 | ||
129 | ;;; Gray stream implementation for stream sockets | |
130 | ||
131 | (define-condition stream-mode-error (socket-condition stream-error error) | |
132 | ((expected-mode :initarg :expected-mode)) | |
133 | (:report (lambda (c s) | |
134 | (with-slots (expected-mode socket) c | |
135 | (format s "Tried to use ~S in ~A mode, but it is in ~A mode." socket expected-mode (stream-socket-mode socket)))))) | |
136 | ||
137 | (defun gray-stream-element-type (socket) | |
138 | (declare (type stream-socket socket)) | |
139 | (ecase (slot-value socket 'mode) | |
140 | ((:byte) '(unsigned-byte 8)) | |
141 | ((:character) 'character))) | |
142 | ||
143 | (defun gray-open-stream-p (socket) | |
144 | (declare (type stream-socket socket)) | |
145 | (socket-open-p socket)) | |
146 | ||
147 | (defun fill-byte-buffer (socket bytes &optional no-hang) | |
148 | (declare (type stream-socket socket) | |
149 | (type fixnum bytes)) | |
150 | (with-slots (byte-buffer byte-read-pos byte-write-pos) socket | |
151 | (loop (unless (< (- byte-write-pos byte-read-pos) bytes) (return t)) | |
152 | (when (< (- (length byte-buffer) byte-read-pos) bytes) | |
153 | (adjust-array byte-buffer (list (+ byte-read-pos bytes 128)))) | |
154 | (let ((recv-len (socket-recv-into socket byte-buffer :start byte-write-pos :no-hang no-hang))) | |
155 | (cond ((null recv-len) | |
156 | (unless no-hang | |
157 | (error "~S returned NIL even when called blocking." 'socket-recv-into)) | |
158 | (return :wait)) | |
159 | ((= recv-len 0) | |
160 | (return nil))) | |
161 | (incf byte-write-pos recv-len))))) | |
162 | ||
163 | (defun trim-byte-buffer (socket) | |
164 | (declare (type stream-socket socket)) | |
165 | (with-slots (byte-buffer byte-read-pos byte-write-pos) socket | |
166 | (replace byte-buffer byte-buffer :start2 byte-read-pos :end2 byte-write-pos) | |
167 | (decf byte-write-pos byte-read-pos) | |
168 | (setf byte-read-pos 0) | |
169 | (when (> (length byte-buffer) (* byte-write-pos 2)) | |
170 | (adjust-array byte-buffer (list byte-write-pos))))) | |
171 | ||
172 | (defun gray-stream-read-byte (socket) | |
173 | (declare (type stream-socket socket)) | |
174 | (unless (fill-byte-buffer socket 1) | |
175 | (return-from gray-stream-read-byte :eof)) | |
176 | (unless (eq (stream-socket-mode socket) :byte) | |
177 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :byte)) | |
178 | (with-slots (byte-buffer byte-read-pos) socket | |
179 | (prog1 (aref byte-buffer byte-read-pos) | |
180 | (when (> (incf byte-read-pos) 128) | |
181 | (trim-byte-buffer socket))))) | |
182 | ||
183 | (defun gray-stream-write-byte (socket byte) | |
184 | (declare (type stream-socket socket)) | |
185 | (unless (eq (stream-socket-mode socket) :byte) | |
186 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :byte)) | |
187 | (let ((buf (make-array '(1) :element-type '(unsigned-byte 8) :initial-element byte))) | |
188 | (loop (when (> (socket-send socket buf) 0) | |
189 | (return))))) | |
190 | ||
191 | (defun fill-char-buffer (socket chars &optional no-hang) | |
192 | (declare (type stream-socket socket)) | |
193 | (unless (eq (stream-socket-mode socket) :character) | |
194 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
195 | (with-slots (decoder byte-buffer byte-read-pos byte-write-pos char-buffer char-read-pos) socket | |
196 | (loop (unless (< (- (length char-buffer) char-read-pos) chars) (return t)) | |
197 | (case (fill-byte-buffer socket chars no-hang) | |
198 | ((nil) (return nil)) | |
199 | ((:wait) (return :wait))) | |
200 | (funcall decoder byte-buffer char-buffer :start byte-read-pos :end byte-write-pos) | |
201 | (setf byte-read-pos 0 | |
202 | byte-write-pos 0)))) | |
203 | ||
204 | (defun trim-char-buffer (socket) | |
205 | (declare (type stream-socket socket)) | |
206 | (with-slots (char-buffer char-read-pos) socket | |
207 | (replace char-buffer char-buffer :start2 char-read-pos) | |
208 | (decf (fill-pointer char-buffer) char-read-pos) | |
209 | (setf char-read-pos 0))) | |
210 | ||
211 | (defun gray-stream-read-char (socket) | |
212 | (declare (type stream-socket socket)) | |
213 | (unless (eq (stream-socket-mode socket) :character) | |
214 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
215 | (unless (fill-char-buffer socket 1) | |
216 | (return-from gray-stream-read-char :eof)) | |
217 | (with-slots (char-buffer char-read-pos) socket | |
218 | (prog1 (aref char-buffer char-read-pos) | |
219 | (when (>= (incf char-read-pos) 64) | |
220 | (trim-char-buffer socket))))) | |
221 | ||
222 | (defun gray-stream-unread-char (socket char) | |
223 | (declare (type stream-socket socket)) | |
224 | (unless (eq (stream-socket-mode socket) :character) | |
225 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
226 | (with-slots (char-buffer char-read-pos) socket | |
227 | (when (= char-read-pos 0) | |
228 | (let ((len (length char-buffer))) | |
229 | (when (< (array-dimension char-buffer 0) (+ len 16)) | |
230 | (adjust-array char-buffer (list (setf (fill-pointer char-buffer) (+ len 16))))) | |
231 | (replace char-buffer char-buffer :start1 16 :end2 len))) | |
232 | (setf (aref char-buffer (decf char-read-pos)) char) | |
233 | nil)) | |
234 | ||
235 | (defun gray-stream-read-char-no-hang (socket) | |
236 | (declare (type stream-socket socket)) | |
237 | (unless (eq (stream-socket-mode socket) :character) | |
238 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
239 | (case (fill-char-buffer socket 1) | |
240 | ((nil) (return-from gray-stream-read-char-no-hang :eof)) | |
241 | ((:wait) (return-from gray-stream-read-char-no-hang nil))) | |
242 | (with-slots (char-buffer char-read-pos) socket | |
243 | (prog1 (aref char-buffer char-read-pos) | |
244 | (when (>= (incf char-read-pos) 64) | |
245 | (trim-char-buffer socket))))) | |
246 | ||
247 | (defun gray-stream-peek-char (socket) | |
248 | (declare (type stream-socket socket)) | |
249 | (unless (eq (stream-socket-mode socket) :character) | |
250 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
251 | (unless (fill-char-buffer socket 1) | |
252 | (return-from gray-stream-peek-char :eof)) | |
253 | (with-slots (char-buffer char-read-pos) socket | |
254 | (aref char-buffer char-read-pos))) | |
255 | ||
256 | (defun gray-stream-listen (socket) | |
257 | (declare (type stream-socket socket)) | |
258 | (unless (eq (stream-socket-mode socket) :character) | |
259 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
260 | (case (fill-char-buffer socket 1) | |
261 | ((nil :wait) (return-from gray-stream-listen nil))) | |
262 | (with-slots (char-buffer char-read-pos) socket | |
263 | (aref char-buffer char-read-pos))) | |
264 | ||
265 | (defun gray-stream-write-char (socket char) | |
266 | (declare (type stream-socket socket)) | |
267 | (unless (eq (stream-socket-mode socket) :character) | |
268 | (error 'stream-mode-error :stream socket :socket socket :expected-mode :character)) | |
269 | (with-slots (encoder) socket | |
270 | (let ((seq (make-array '(1) :element-type 'character :initial-element char)) | |
271 | (outbuf (make-array '(16) :element-type '(unsigned-byte 8) :adjustable t :fill-pointer 0))) | |
272 | (funcall encoder seq outbuf) | |
273 | (let ((pos 0)) | |
274 | (loop (unless (< pos (length outbuf)) (return)) | |
275 | (incf pos (socket-send socket outbuf :start pos))))))) | |
276 | ||
277 | (defun gray-stream-read-sequence (socket seq start end) | |
278 | (declare (type stream-socket socket)) | |
279 | (ecase (stream-socket-mode socket) | |
280 | ((:byte) | |
281 | (fill-byte-buffer socket (- end start)) | |
282 | (with-slots (byte-buffer byte-read-pos byte-write-pos) socket | |
283 | (replace seq byte-buffer :start1 start :start2 byte-read-pos :end1 end :end2 byte-write-pos) | |
284 | (let ((len (min (- end start) (- byte-write-pos byte-read-pos)))) | |
285 | (when (> (incf byte-read-pos len) 128) | |
286 | (trim-byte-buffer socket)) | |
287 | (+ start len)))) | |
288 | ((:character) | |
289 | (fill-char-buffer socket (- end start)) | |
290 | (with-slots (char-buffer char-read-pos) socket | |
291 | (replace seq char-buffer :start1 start :start2 char-read-pos :end1 end :end2 (length char-buffer)) | |
292 | (let ((len (min (- end start) (- (length char-buffer) char-read-pos)))) | |
293 | (when (> (incf char-read-pos len) 128) | |
294 | (trim-char-buffer socket)) | |
295 | (+ start len)))))) | |
296 | ||
297 | (defmethod gray-stream-write-sequence (socket seq start end) | |
298 | (declare (type stream-socket socket)) | |
299 | (let ((end (or end (length seq)))) | |
300 | (ecase (stream-socket-mode socket) | |
301 | ((:byte) | |
302 | (loop (unless (< start end) (return seq)) | |
303 | (incf start (socket-send socket seq :start start :end end)))) | |
304 | ((:character) | |
305 | (with-slots (encoder) socket | |
306 | (let ((outbuf (make-array (list (- end start)) :element-type '(unsigned-byte 8) :adjustable t :fill-pointer 0)) | |
307 | (pos 0)) | |
308 | (funcall encoder seq outbuf :start start :end end) | |
309 | (loop (unless (< pos (length outbuf)) (return seq)) | |
310 | (incf pos (socket-send socket outbuf :start pos))))))))) | |
311 | ||
312 | ;;; IPv4 addresses | |
313 | ||
314 | (defclass ipv4-address (inet-host-address) | |
315 | ((bytes :initarg :bytes :type (array (unsigned-byte 8) 4)))) | |
316 | ||
317 | (defun make-ipv4-address (o1 o2 o3 o4) | |
318 | (make-instance 'ipv4-address :bytes (make-array '(4) | |
319 | :element-type '(unsigned-byte 8) | |
320 | :initial-contents (list o1 o2 o3 o4)))) | |
321 | ||
322 | (defun parse-ipv4-address (string) | |
323 | (let ((o 0) | |
324 | (start 0) | |
325 | (string (concatenate 'string string ".")) | |
326 | (buf (make-array '(4) :element-type '(unsigned-byte 8)))) | |
327 | (dotimes (i (length string)) | |
328 | (let ((ch (elt string i))) | |
329 | (cond ((eql ch #\.) | |
330 | (if (< o 4) | |
331 | (progn (setf (aref buf o) (let ((n (parse-integer string :start start :end i))) | |
332 | (if (and n (<= 0 n 255)) | |
333 | n | |
334 | (error "IPv4 dottet-quad numbers must be octets")))) | |
335 | (setf start (1+ i)) | |
336 | (incf o)) | |
337 | (error "Too many octets in IPv4 address"))) | |
338 | ((char<= #\0 ch #\9) | |
339 | nil) | |
340 | (t (error "Invalid character ~S in IPv4 address" ch))))) | |
341 | (if (< o 4) | |
342 | (error "Too few octets in IPv4 address") | |
343 | (make-instance 'ipv4-address :bytes buf)))) | |
344 | ||
dfa6197c FT |
345 | (defmethod format-address ((address ipv4-address)) |
346 | (with-slots (bytes) address | |
347 | (format nil "~D.~D.~D.~D" | |
348 | (aref bytes 0) | |
349 | (aref bytes 1) | |
350 | (aref bytes 2) | |
351 | (aref bytes 3)))) | |
352 | ||
353 | (export '(ipv4-address make-ipv4-address parse-ipv4-address)) | |
354 | ||
355 | ;;; IPv6 addresses | |
356 | ||
357 | (defclass ipv6-address (inet-host-address) | |
358 | ((bytes :initarg :bytes :type (array (unsigned-byte 8) 16)))) | |
359 | ||
360 | (defun parse-ipv6-address (string) | |
361 | (declare (ignore string)) | |
362 | (error "IPv6 parsing not implemented yet")) | |
363 | ||
dfa6197c FT |
364 | (export '(ipv6-address parse-ipv6-address)) |
365 | ||
366 | ;;; TCP code | |
367 | ||
368 | (defclass inet-port-address (inet-address) | |
369 | ((host :initarg :host :type (or null inet-host-address)) | |
370 | (port :initarg :port :type (unsigned-byte 16)))) | |
371 | ||
372 | (defclass tcp-address (inet-port-address) ()) | |
373 | ||
374 | (defmethod format-address ((address tcp-address)) | |
375 | (with-slots (host port) address | |
376 | (format nil "~A:~D" (if host (format-address host) "*") port))) | |
377 | ||
378 | (defun inet-resolve-colon-port (string) | |
379 | (let ((colon (position #\: string))) | |
380 | (if (null colon) | |
381 | (error "No colon in TCP address")) | |
382 | (if (find #\: string :start (1+ colon)) | |
383 | (error "More than one colon in TCP address")) | |
384 | (let ((port (parse-integer (subseq string (1+ colon)))) | |
385 | (host (let ((host-part (subseq string 0 colon))) | |
386 | (if (equal host-part "*") | |
387 | nil | |
388 | (resolve-address host-part))))) | |
389 | (if (not (typep host '(or null inet-host-address))) | |
390 | (error "Must have an internet address for TCP connections")) | |
391 | (values host port)))) | |
392 | ||
393 | (defun resolve-tcp-colon-port (address) | |
394 | (multiple-value-bind (host port) | |
395 | (inet-resolve-colon-port address) | |
396 | (make-instance 'tcp-address :host host :port port))) | |
397 | ||
dfa6197c FT |
398 | (export '(tcp-address resolve-tcp-colon-port)) |
399 | ||
400 | ;;; UDP code | |
401 | ||
402 | (defclass udp-address (inet-port-address) ()) | |
403 | ||
404 | (defmethod format-address ((address udp-address)) | |
405 | (with-slots (host port) address | |
406 | (format nil "~A:~D" (if host (format-address host) "*") port))) | |
407 | ||
408 | (defun resolve-udp-colon-port (address) | |
409 | (multiple-value-bind (host port) | |
410 | (inet-resolve-colon-port address) | |
411 | (make-instance 'udp-address :host host :port port))) | |
412 | ||
413 | (export '(udp-address resolve-udp-colon-port)) | |
414 | ||
415 | ;;; Unix sockets | |
416 | ||
417 | (defclass local-address (address) | |
418 | ((path :initarg :path :type pathname))) | |
419 | ||
420 | (defmethod format-address ((address local-address)) | |
421 | (namestring (slot-value address 'path))) | |
422 | ||
423 | (defclass local-stream-address (local-address) ()) | |
424 | (defclass local-seq-address (local-address) ()) | |
425 | (defclass local-datagram-address (local-address) ()) | |
426 | ||
427 | (defun make-local-address (pathspec &optional (type :stream)) | |
428 | (make-instance (ecase type | |
429 | ((:stream) 'local-stream-address) | |
430 | ((:seq) 'local-seq-address) | |
431 | ((:datagram) 'local-datagram-address)) | |
432 | :path (pathname pathspec))) | |
433 | ||
434 | (export '(local-address make-local-address)) |