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Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.95 by root, Sun Nov 18 09:37:56 2012 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 3 *
4 Copyright (C) 1992 Frank Tore Johansen 4 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 5 *
6 This program is free software; you can redistribute it and/or modify 6 * Deliantra is free software: you can redistribute it and/or modify it under
7 it under the terms of the GNU General Public License as published by 7 * the terms of the Affero GNU General Public License as published by the
8 the Free Software Foundation; either version 2 of the License, or 8 * Free Software Foundation, either version 3 of the License, or (at your
9 (at your option) any later version. 9 * option) any later version.
10 10 *
11 This program is distributed in the hope that it will be useful, 11 * This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details. 14 * GNU General Public License for more details.
15 15 *
16 You should have received a copy of the GNU General Public License 16 * You should have received a copy of the Affero GNU General Public License
17 along with this program; if not, write to the Free Software 17 * and the GNU General Public License along with this program. If not, see
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18 * <http://www.gnu.org/licenses/>.
19
20 The author can be reached via e-mail to mark@pyramid.com
21*/
22
23/**
24 * \file
25 * Low-level socket-related functions.
26 * 19 *
27 * \date 2003-12-02 20 * The authors can be reached via e-mail to <support@deliantra.net>
28 *
29 * Contains some base functions that both the client and server
30 * can use. As such, depending what we are being compiled for will
31 * determine what we can include. the client is designed have
32 * CFCLIENT defined as part of its compile flags.
33 */ 21 */
34 22
35using namespace std; 23using namespace std;
36 24
37#include <global.h> 25#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 26#include <sproto.h>
40#include <cstdarg> 27#include <cstdarg>
41 28
42#ifdef __linux__ 29#if HAVE_TCP_INFO
43# include <sys/types.h> 30# include <sys/types.h>
44# include <sys/socket.h> 31# include <sys/socket.h>
45# include <netinet/in.h> 32# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 33# include <netinet/tcp.h>
48#endif 34#endif
49 35
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// force a packet when idle for more than this many seconds,
51// easily die in 20 seconds... 37// forcing an ack regularly.
52#define SOCKET_TIMEOUT1 10 38#define IDLE_PING 2.
53#define SOCKET_TIMEOUT2 20
54 39
55void 40void
56Socket_Flush (client_socket * ns) 41client::flush ()
57{ 42{
58#ifdef __linux__ 43 if (destroyed ())
59 // check time of last ack, and, if too old, kill connection 44 return;
60 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi);
62 45
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 46 /**
64 { 47 * Writes data to socket.
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 48 *
49 * When the socket is clear to write, and we have backlogged data, this
50 * is called to write it out.
51 */
66 52
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 53 // write a nop to the socket at least every IDLE_PING seconds.
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 54 if (!outputbuffer.len)
69 { 55 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead;
73 } 57 {
58 // this is a bit ugly, but map1a seems to be the only
59 // nop'able command and it is quite small.
60 packet sl ("map1a");
61 send_packet (sl);
62 }
63 else
64 return;
65 }
66
67 if (socket_ev.poll () & EV_WRITE)
68 return;
69
70 last_send = NOW;
71 write_outputbuffer ();
72}
73
74void
75client::write_outputbuffer ()
76{
77 while (outputbuffer.len)
74 } 78 {
79 int res = write (fd, outputbuffer.data + outputbuffer.start,
80 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
75 81
76 int val; 82 if (res > 0)
83 {
84 outputbuffer.start += res;
85 /* wrap back to start of buffer */
86 if (outputbuffer.start == SOCKETBUFSIZE)
87 outputbuffer.start = 0;
77 88
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 89 outputbuffer.len -= res;
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 90 }
80#endif 91 else if (res == 0)
81} 92 {
93 LOG (llevError, "socket write failed, connection closed.\n");
94 destroy ();
95 return;
96 }
97 else if (errno == EINTR)
98 {
99 // just retry
100 }
101 else if (errno == EAGAIN)
102 {
103 // delay till ready
104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
105 socket_ev.start ();
106 return;
107 }
108 else
109 {
110 LOG (llevError, "socket write failed: %s\n", strerror (errno));
111 destroy ();
112 return;
113 }
114 }
82 115
116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
117}
118
119/******************************************************************************
120 *
121 * Start of read routines.
122 *
123 ******************************************************************************/
124
125int
126client::next_packet ()
127{
128 if (inbuf_len >= 2)
129 {
130 int pkt_len = (inbuf [0] << 8) | inbuf [1];
131
132 if (inbuf_len >= 2 + pkt_len)
133 return 2 + pkt_len;
134
135 if (inbuf_len == sizeof (inbuf))
136 {
137 send_packet_printf ("msg %d log input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
138 destroy ();
139 return -1;
140 }
141 }
142
143 return 0;
144}
145
146void
147client::skip_packet (int len)
148{
149 inbuf_len -= len;
150 memmove (inbuf, inbuf + len, inbuf_len);
151}
152
83/*********************************************************************** 153/*****************************************************************************
84 * 154 * Start of command dispatch area.
85 * packet functions/utilities 155 * The commands here are protocol commands.
86 *
87 **********************************************************************/ 156 ****************************************************************************/
88 157
89packet &packet::operator <<(const data &v) 158// SocketCommand, PlayingCommand, should not exist with those ugly casts
159#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
160#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
161
162static void
163NopCmd (char *, int, client *)
90{ 164{
91 if (room () < v.len) 165 // do nothing
92 reset (); 166}
167
168/**
169 * Dispatch table for the server.
170 */
171static struct packet_type packets[] = {
172 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND },
173
174 {"examine", PC(ExamineCmd) PF_PLAYING },
175 {"ex", PC(ExCmd) PF_PLAYING },
176 {"apply", PC(ApplyCmd) PF_PLAYING },
177 {"lookat", PC(LookAt) PF_PLAYING },
178 {"lock", PC(LockItem) PF_PLAYING },
179 {"mark", PC(MarkItem) PF_PLAYING },
180 {"move", PC(MoveCmd) PF_PLAYING },
181 {"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
182 {"mapredraw", PC(MapRedrawCmd) 0 },
183 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
184
185 {"reply", SC(ReplyCmd) 0 },
186 {"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
187 {"addme", SC(AddMeCmd) 0 },
188 {"askface", SC(AskFaceCmd) 0 },
189 {"requestinfo", SC(RequestInfo) 0 },
190 {"setsound", SC(SetSound) 0 },
191 {"setup", SC(SetUp) 0 },
192 {"version", SC(VersionCmd) 0 },
193
194 {"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
195};
196
197bool
198client::may_execute (const packet_type *pkt) const
199{
200 return (!(pkt->flags & PF_PLAYER) || pl)
201 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
202}
203
204// HACK: some commands currently should be executed
205// even when the player is frozen. this hack detects
206// those commands. it should be folded into may_execute,
207// but kept seperate to emphasise the hack aspect, i.e.
208// do it better, then remove.
209static bool
210always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
211{
212 if (!(pkt->flags & PF_COMMAND))
213 return false;
214
215 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
216 return false;
217
218 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
219 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
220 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
221 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
222 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
223
224 if (len == 7 && !strcmp (data, "suicide")) return true;
225
226 return false;
227}
228
229void
230client::execute (const packet_type *pkt, char *data, int datalen)
231{
232 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
233 {
234 //TODO: only one format
235 if (pkt->flags & PF_PLAYER)
236 {
237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
238 pl->need_updated_stats ();
239 }
240 else
241 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
242 }
93 else 243 else
244 send_packet_printf ("drawinfo %d log ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
245}
246
247bool
248client::handle_packet ()
249{
250 int pkt_len = next_packet ();
251
252 if (!pkt_len)
253 return false;
254 else if (pkt_len < 0)
255 {
256 LOG (llevError, "read error on player %s\n",
257 pl && pl->ob ? &pl->ob->name : "[anonymous]");
258 destroy ();
259 return false;
94 { 260 }
95 if (v.len) 261
262 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
263 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
264
265 /* First, break out beginning word. There are at least
266 * a few commands that do not have any paremeters. If
267 * we get such a command, don't worry about trying
268 * to break it up.
269 */
270 int datalen;
271 char *data = strchr ((char *)inbuf + 2, ' ');
272
273 if (data)
274 {
275 *data++ = 0;
276 datalen = pkt_len - (data - (char *)inbuf);
277 }
278 else
279 {
280 data = (char *)inbuf + 2; // better read garbage than segfault
281 datalen = 0;
282 }
283
284 for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
285 if (!strcmp ((char *)inbuf + 2, pkt->name))
96 { 286 {
97 memcpy (cur, v.ptr, v.len); 287 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
98 cur += v.len; 288 queue_command (pkt, data, datalen);
289 else
290 execute (pkt, data, datalen);
291
292 goto next_packet;
293 }
294
295 // If we get here, we didn't find a valid command.
296 send_packet_printf ("msg %d log ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
297
298next_packet:
299 inbuf [pkt_len] = save_byte; // rather ugly
300 skip_packet (pkt_len);
301
302 // input buffer has space again
303 socket_ev.poll (socket_ev.poll () | EV_READ);
304
305 return true;
306}
307
308void
309client::inbuf_handle ()
310{
311 if (!handle_packet ())
312 return;
313
314 while (handle_packet ())
315 ;
316
317 flush ();
318}
319
320// callback called when socket is either readable or writable
321void
322client::socket_cb (iow &w, int revents)
323{
324 //TODO remove when we have better socket cleanup logic
325 if (destroyed ())
326 {
327 socket_ev.poll (0);
328 return;
329 }
330
331 if (revents & EV_WRITE)
332 {
333 write_outputbuffer ();
334
335 if (!outputbuffer.len)
336 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
337 }
338
339 if (revents & EV_READ)
340 {
341 int amount;
342 uint8 *rbuf;
343
344 if (ws_version)
99 } 345 {
100 } 346 if (ws_inbuf_len + 2048 > ws_inbuf_alloc)
347 ws_inbuf = (uint8 *)realloc (ws_inbuf, ws_inbuf_alloc += 4096);
101 348
102 return *this; 349 rbuf = ws_inbuf + ws_inbuf_len;
103} 350 amount = ws_inbuf_alloc - ws_inbuf_len;
104
105packet &packet::operator <<(const data8 &v)
106{
107 unsigned int len = min (v.len, 0x00FF);
108 return *this << uint8 (len) << data (v.ptr, len);
109}
110
111packet &packet::operator <<(const data16 &v)
112{
113 unsigned int len = min (v.len, 0xFFFF);
114 return *this << uint16 (len) << data (v.ptr, len);
115}
116
117packet &packet::operator <<(const char *v)
118{
119 return *this << data (v, strlen (v ? v : 0));
120}
121
122void
123packet::printf (const char *format, ...)
124{
125 int size = room ();
126
127 va_list ap;
128 va_start (ap, format);
129 int len = vsnprintf ((char *)cur, size, format, ap);
130 va_end (ap);
131
132 if (len >= size)
133 return reset ();
134
135 cur += len;
136}
137
138/******************************************************************************
139 *
140 * Start of read routines.
141 *
142 ******************************************************************************/
143
144int
145client_socket::read_packet ()
146{
147 for (;;)
148 {
149 if (inbuf_len >= 2)
150 { 351 }
151 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 352 else
152
153 if (inbuf_len >= 2 + pkt_len)
154 return pkt_len + 2;
155 } 353 {
156 354 rbuf = inbuf + inbuf_len;
157 int amount = sizeof (inbuf) - inbuf_len; 355 amount = sizeof (inbuf) - inbuf_len;
158
159 if (amount <= 0)
160 { 356 }
161 LOG (llevError, "packet too large");//TODO
162 return -1;
163 }
164
165 amount = read (fd, inbuf + inbuf_len, amount);
166 357
167 if (!amount) 358 if (!amount)
168 { 359 {
169 status = Ns_Dead; 360 // input buffer full
361 LOG (llevError, "input buffer overflow.");
362 destroy ();
170 return -1; 363 return;
364 }
365
366 amount = read (fd, rbuf, amount);
367
368 if (!amount)
369 {
370 destroy ();
371 return;
171 } 372 }
172 else if (amount < 0) 373 else if (amount < 0)
173 { 374 {
174 if (errno != EAGAIN && errno != EINTR) 375 if (errno != EAGAIN && errno != EINTR)
175 { 376 {
176 LOG (llevError, "read error: %s", strerror (errno)); 377 LOG (llevError, "read error: %s\n", strerror (errno));
378 destroy ();
177 return -1; 379 return;
178 } 380 }
179 381
180 return 0; 382 // should not be here, normally
383 }
384
385 if (ws_version)
181 } 386 {
387 ws_inbuf_len += amount;
182 388
389 while (ws_inbuf_len)
390 {
391 if (ws_inbuf_len < 2 + 4) // 6 is minimum length: op, len, mask
392 break;
393
394 int d = 2;
395 int fin = ws_inbuf [0] & 0x80;
396 int op = ws_inbuf [0] & 0x0f;
397 int len = ws_inbuf [1] & 0x7f;
398
399 if (len == 126)
400 {
401 len = (ws_inbuf [2] << 8) | ws_inbuf [3];
402 d += 2;
403 }
404 else if (len == 127)
405 {
406 if (ws_inbuf_len < 2 + 8)
407 return;
408
409 // we don't do extra long frames, if a browser wants to send >2**32 bytes,
410 // there are bigger issues to fix.
411 len = (ws_inbuf [8] << 8) | ws_inbuf [9];
412 d += 8;
413 }
414
415 // we only continue if we have a complete frame
416 if (ws_inbuf_len < d + 4 + len)
417 return;
418
419 switch (op)
420 {
421 case 0: op = ws_inbuf_type; break; // continuation
422 case 1: ws_inbuf_type = 1; break; // utf-8
423 case 2: ws_inbuf_type = 2; break; // binary
424 }
425
426 if (len > sizeof (inbuf) - inbuf_len)
427 {
428 // input buffer full
429 LOG (llevError, "input buffer overflow (ws).");
430 destroy ();
431 return;
432 }
433
434 uint8 *buf = inbuf + inbuf_len + 2;
435
436 for (int i = 0; i < len; ++i)
437 buf [i] = ws_inbuf [d + 4 + i] ^ ws_inbuf [d + (i & 3)];
438
439 // remove frame
440 ws_inbuf_len -= d + 4 + len;
441 memmove (ws_inbuf, ws_inbuf + d + 4 + len, ws_inbuf_len);
442
443 switch (op)
444 {
445 case 1: // utf-8
446 // utf-8 encoded frames cannot have full length (MAXSOCKBUF) in all cases
447 // but we assume that these extra-long packets will be rare.
448 {
449 uint8 *a = buf;
450 uint8 *b = a;
451 uint8 *c = a + len;
452
453 for (; a < c; ++a, ++b)
454 {
455 *b = *a;
456
457 if (*a >= 0x80)
458 *b = (a [0] & 0x1f) << 6 | (a [1] & 0x3f), ++a;
459 }
460
461 len -= a - b;
462 }
463 /* FALLTHROUGH */
464 case 2: // binary
465 inbuf_len += len;
466
467 if (fin)
468 {
469 inbuf [0] = inbuf_len >> 8;
470 inbuf [1] = inbuf_len;
471
472 inbuf_len += 2;
473
474 inbuf_handle ();
475 }
476 break;
477
478 case 9: // ping
479 {
480 // send pong - we assume ping messages are <64k
481 // as we can't handle >10k at the moment anyway.
482 uint8 hdr [] = { 0x8a, 126, len >> 8, len };
483 send (hdr, sizeof (hdr));
484 send (inbuf + inbuf_len, len);
485 }
486 break;
487
488 case 10: // pong
489 break;
490
491 case 8: // close
492 default:
493 destroy ();
494 return;
495 }
496 }
497 }
498 else
499 {
183 inbuf_len += amount; 500 inbuf_len += amount;
184 501 inbuf_handle ();
185 cst_tot.ibytes += amount; 502 }
186 cst_lst.ibytes += amount;
187 } 503 }
188}
189
190void
191client_socket::skip_packet (int len)
192{
193 inbuf_len -= len;
194 memmove (inbuf, inbuf + len, inbuf_len);
195} 504}
196 505
197/******************************************************************************* 506/*******************************************************************************
198 * 507 *
199 * Start of write related routines. 508 * Start of write related routines.
204 * Adds data to a socket buffer for whatever reason. 513 * Adds data to a socket buffer for whatever reason.
205 * 514 *
206 * ns is the socket we are adding the data to, buf is the start of the 515 * ns is the socket we are adding the data to, buf is the start of the
207 * data, and len is the number of bytes to add. 516 * data, and len is the number of bytes to add.
208 */ 517 */
209 518void
210static void 519client::send (void *buf_, int len)
211add_to_buffer (client_socket *ns, char *buf, int len)
212{ 520{
521 char *buf = (char *)buf_;
522
523 if (destroyed () || !buf)
524 return;
525
526 if (len + outputbuffer.len > SOCKETBUFSIZE)
527 {
528 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
529 // shutdown the socket, this is safer than destroying it immediately
530 // as lots of code in the callchain might still access the map etc.
531 shutdown (fd, SHUT_RDWR);
532 return;
533 }
534
213 int avail, end; 535 int avail, end;
214
215 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216 {
217 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218 ns->status = Ns_Dead;
219 return;
220 }
221 536
222 /* data + end is where we start putting the new data. The last byte 537 /* data + end is where we start putting the new data. The last byte
223 * currently in use is actually data + end -1 538 * currently in use is actually data + end -1
224 */ 539 */
225
226 end = ns->outputbuffer.start + ns->outputbuffer.len; 540 end = outputbuffer.start + outputbuffer.len;
227 /* The buffer is already in a wrapped state, so adjust end */ 541 /* The buffer is already in a wrapped state, so adjust end */
228 if (end >= SOCKETBUFSIZE) 542 if (end >= SOCKETBUFSIZE)
229 end -= SOCKETBUFSIZE; 543 end -= SOCKETBUFSIZE;
230 544
231 avail = SOCKETBUFSIZE - end; 545 avail = SOCKETBUFSIZE - end;
232 546
233 /* We can all fit it behind the current data without wrapping */ 547 /* We can all fit it behind the current data without wrapping */
234 if (avail >= len) 548 if (avail >= len)
235 memcpy (ns->outputbuffer.data + end, buf, len); 549 memcpy (outputbuffer.data + end, buf, len);
236 else 550 else
237 { 551 {
238 memcpy (ns->outputbuffer.data + end, buf, avail); 552 memcpy (outputbuffer.data + end, buf, avail);
239 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 553 memcpy (outputbuffer.data, buf + avail, len - avail);
240 } 554 }
241 555
242 ns->outputbuffer.len += len; 556 outputbuffer.len += len;
243#if 0
244 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245#endif
246}
247
248/**
249 * Writes data to socket.
250 *
251 * When the socket is clear to write, and we have backlogged data, this
252 * is called to write it out.
253 */
254void
255write_socket_buffer (client_socket * ns)
256{
257 int amt, max;
258
259 if (ns->outputbuffer.len == 0)
260 {
261 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262 return;
263 }
264
265 do
266 {
267 max = SOCKETBUFSIZE - ns->outputbuffer.start;
268 if (ns->outputbuffer.len < max)
269 max = ns->outputbuffer.len;
270
271 do
272 {
273 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274 }
275 while ((amt < 0) && (errno == EINTR));
276
277 if (amt < 0)
278 { /* We got an error */
279
280 if (errno != EWOULDBLOCK)
281 {
282 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283 ns->status = Ns_Dead;
284 return;
285 }
286 else
287 { /* EWOULDBLOCK */
288 /* can't write it, so store it away. */
289 ns->can_write = 0;
290 return;
291 }
292 }
293 ns->outputbuffer.start += amt;
294 /* wrap back to start of buffer */
295 if (ns->outputbuffer.start == SOCKETBUFSIZE)
296 ns->outputbuffer.start = 0;
297 ns->outputbuffer.len -= amt;
298#ifdef CS_LOGSTATS
299 cst_tot.obytes += amt;
300 cst_lst.obytes += amt;
301#endif
302 }
303 while (ns->outputbuffer.len > 0);
304}
305
306/**
307 * This writes data to the socket. - It is very low level -
308 * all we try and do is write out the data to the socket
309 * provided (ns). buf is the data to write, len is the number
310 * of bytes to write. IT doesn't return anything - rather, it
311 * updates the ns structure if we get an error.
312 */
313void
314client_socket::send (void *buf_, int len)
315{
316 char *buf = (char *)buf_;
317 char *pos = buf;
318 int amt = 0;
319
320 if (status == Ns_Dead || !buf)
321 {
322 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323 return;
324 }
325
326#ifndef __GNU__ /* This caused problems on Hurd */
327 if (!can_write)
328 {
329 add_to_buffer (this, buf, len);
330 return;
331 }
332#endif
333
334 /* If we manage to write more than we wanted, take it as a bonus */
335 while (len > 0)
336 {
337 do
338 {
339 amt = write (fd, pos, len);
340 }
341 while ((amt < 0) && (errno == EINTR));
342
343 if (amt < 0)
344 { /* We got an error */
345 if (errno != EWOULDBLOCK)
346 {
347 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348 errno, strerror (errno));
349 status = Ns_Dead;
350 return;
351 }
352 else
353 { /* EWOULDBLOCK */
354 /* can't write it, so store it away. */
355 add_to_buffer (this, pos, len);
356 can_write = 0;
357 return;
358 }
359 }
360 /* amt gets set to 0 above in blocking code, so we do this as
361 * an else if to make sure we don't reprocess it.
362 */
363 else if (amt == 0)
364 LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366 len -= amt;
367 pos += amt;
368#ifdef CS_LOGSTATS
369 cst_tot.obytes += amt;
370 cst_lst.obytes += amt;
371#endif
372 }
373} 557}
374 558
375/** 559/**
376 * Takes a string of data, and writes it out to the socket. A very handy 560 * Takes a string of data, and writes it out to the socket. A very handy
377 * shortcut function. 561 * shortcut function.
378 */ 562 */
379
380void 563void
381client_socket::send_packet (packet &sl) 564client::send_packet (packet &sl)
382{ 565{
383 Send_With_Handling (this, &sl); 566 if (destroyed ())
384}
385
386void
387client_socket::send_packet (const char *buf, int len)
388{
389 packet sl;
390
391 sl << data (buf, len);
392 send_packet (sl);
393}
394
395void
396client_socket::send_packet (const char *buf)
397{
398 send_packet (buf, strlen (buf));
399}
400
401/**
402 * Calls Write_To_Socket to send data to the client.
403 *
404 * The only difference in this function is that we take a packet
405 *, and we prepend the length information.
406 */
407void
408Send_With_Handling (client_socket *ns, packet *msg)
409{
410 unsigned char sbuf[4];
411
412 if (ns->status == Ns_Dead || !msg)
413 return; 567 return;
414 568
415 if (msg->length () >= MAXSOCKBUF) 569 if (sl.length () > MAXSOCKBUF)
416 { 570 {
417 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ()); 571 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
418 /* Almost certainly we've overflowed a buffer, so quite now to make 572 /* Almost certainly we've overflowed a buffer, so quit now to make
419 * it easier to debug. 573 * it easier to debug.
420 */ 574 */
421 abort (); 575 abort ();
422 } 576 }
423 577
424 sbuf[0] = ((uint32) (msg->length ()) >> 8); 578 if (!sl.length ())
425 sbuf[1] = ((uint32) (msg->length ()) );
426
427 //TODO: single write, or writev
428 ns->send (sbuf, 2);
429 ns->send (msg->buf, msg->length ());
430}
431
432/******************************************************************************
433 *
434 * statistics logging functions.
435 *
436 ******************************************************************************/
437
438#ifdef CS_LOGSTATS
439
440/* cst_tot is for the life of the server, cst_last is for the last series of
441 * stats
442 */
443CS_Stats cst_tot, cst_lst;
444
445/**
446 * Writes out the gathered stats. We clear cst_lst.
447 */
448void
449write_cs_stats (void)
450{
451 time_t now = time (NULL);
452
453 /* If no connections recently, don't both to log anything */
454 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
455 return; 579 return;
456 580
457 /* CSSTAT is put in so scripts can easily find the line */ 581 if (ws_version == 8)
458 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 582 {
459 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 583 static uint8 buf [MAXSOCKBUF * 2 + 4];
460 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
461 cst_lst.ibytes = 0;
462 cst_lst.obytes = 0;
463 cst_lst.time_start = now;
464}
465#endif
466 584
585 uint8 *b = buf + 4;
586 for (uint8 *a = sl.buf_ + sl.hdrlen; a < sl.cur; ++a)
587 {
588 if (*a < 0x80)
589 *b++ = *a;
590 else
591 {
592 *b++ = 0xc0 | ((*a >> 6) & 0x1f);
593 *b++ = 0x80 | ( *a & 0x3f);
594 }
595 }
596
597 assert (b - buf < sizeof (buf));
598
599 int len = b - (buf + 4);
600
601 if (len < 126)
602 {
603 buf [2] = 0x81;
604 buf [3] = len;
605
606 send (buf + 2, len + 2);
607 }
608 else
609 {
610 buf [0] = 0x81;
611 buf [1] = 126;
612 buf [2] = len >> 8;
613 buf [3] = len;
614
615 send (buf, len + 4);
616 }
617 }
618 else if (ws_version == 13)
619 {
620 int len = sl.length ();
621
622 if (len < 126)
623 {
624 uint8 hdr [] = { 0x82, len };
625 send (hdr, sizeof (hdr));
626 }
627 else
628 {
629 uint8 hdr [] = { 0x82, 126, len >> 8, len };
630 send (hdr, sizeof (hdr));
631 }
632
633 send (sl.buf_ + sl.hdrlen, len);
634 }
635 else
636 {
637 assert (sl.hdrlen == 2);
638
639 sl.buf_ [0] = sl.length () >> 8;
640 sl.buf_ [1] = sl.length () ;
641
642 send (sl.buf_, sl.length () + sl.hdrlen);
643 }
644}
645
646void
647client::send_packet (const char *buf, int len)
648{
649 packet sl;
650
651 sl << data (buf, len);
652 send_packet (sl);
653}
654
655void
656client::send_packet (const char *buf)
657{
658 send_packet (buf, strlen (buf));
659}
660
661void
662client::send_packet_printf (const char *format, ...)
663{
664 packet sl;
665
666 va_list ap;
667 va_start (ap, format);
668 sl.vprintf (format, ap);
669 va_end (ap);
670
671 send_packet (sl);
672}
673
674void
675client::send_msg (int color, const char *type, const char *msg)
676{
677 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
678 {
679 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
680 return;
681 }
682
683 int len = strlen (msg);
684
685 if (!(color & NDI_VERBATIM)
686 && (msg_is_special (msg)
687 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
688 cfperl_send_msg (this, color, type, msg);
689 else
690 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
691}
692
693void
694client::send_drawinfo (const char *msg, int flags)
695{
696 send_msg (flags, "log", msg);
697}
698
699/***********************************************************************
700 *
701 * packet functions/utilities
702 *
703 **********************************************************************/
704
705packet::packet (const char *name)
706{
707 reset ();
708
709 int len = strlen (name);
710 memcpy (cur, name, len); cur += len;
711 *cur++ = ' ';
712}
713
714packet &packet::operator <<(const ber32 v)
715{
716 enum { maxlen = 32 / 7 + 1 };
717 uint8 buf[maxlen];
718 uint8 *p = buf + maxlen;
719 uint32 val = v.val;
720
721 *--p = val & 0x7F;
722
723 while (val > 0x7F)
724 {
725 val >>= 7;
726 *--p = (val & 0x7F) | 0x80;
727 }
728
729 return *this << data (p, buf + maxlen - p);
730}
731
732packet &packet::operator <<(const data &v)
733{
734 if (room () < v.len)
735 reset ();
736 else
737 {
738 if (v.len)
739 {
740 memcpy (cur, v.ptr, v.len);
741 cur += v.len;
742 }
743 }
744
745 return *this;
746}
747
748packet &packet::operator <<(const data8 &v)
749{
750 unsigned int len = min (v.len, 0x00FF);
751 return *this << uint8 (len) << data (v.ptr, len);
752}
753
754packet &packet::operator <<(const data16 &v)
755{
756 unsigned int len = min (v.len, 0xFFFF);
757 return *this << uint16 (len) << data (v.ptr, len);
758}
759
760packet &packet::operator <<(const char *v)
761{
762 return *this << data (v, strlen (v ? v : 0));
763}
764
765void
766packet::vprintf (const char *format, va_list ap)
767{
768 int size = room ();
769
770 int len = vsnprintf ((char *)cur, size, format, ap);
771
772 if (len >= size)
773 return reset ();
774
775 cur += len;
776}
777

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