1 |
/* |
2 |
* This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
3 |
* |
4 |
* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
5 |
* Copyright (©) 1992,2007 Frank Tore Johansen |
6 |
* |
7 |
* Crossfire TRT is free software: you can redistribute it and/or modify |
8 |
* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
10 |
* (at your option) any later version. |
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* |
12 |
* 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 |
14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* The authors can be reached via e-mail to <crossfire@schmorp.de> |
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*/ |
22 |
|
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using namespace std; |
24 |
|
25 |
#include <global.h> |
26 |
#include <sproto.h> |
27 |
#include <cstdarg> |
28 |
|
29 |
#if HAVE_TCP_INFO |
30 |
# include <sys/types.h> |
31 |
# include <sys/socket.h> |
32 |
# include <netinet/in.h> |
33 |
# include <netinet/tcp.h> |
34 |
#endif |
35 |
|
36 |
// disconnect a socket after this many seconds without an ack |
37 |
#define SOCKET_TIMEOUT 8. |
38 |
|
39 |
// force a packet when idle for more than this many seconds, |
40 |
// forcing an ack regularly. |
41 |
#define IDLE_PING 2. |
42 |
|
43 |
void |
44 |
client::flush () |
45 |
{ |
46 |
if (destroyed ()) |
47 |
return; |
48 |
|
49 |
#if HAVE_TCP_INFO |
50 |
// check about once per second, spread evenly over all clients |
51 |
// do this only when player is active |
52 |
if (!((pticks + fd) & 7) && pl && pl->active) |
53 |
{ |
54 |
// check time of last ack, and, if too old, kill connection |
55 |
struct tcp_info tcpi; |
56 |
socklen_t len = sizeof (tcpi); |
57 |
|
58 |
if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
59 |
{ |
60 |
if (tcpi.tcpi_snd_mss) |
61 |
mss = tcpi.tcpi_snd_mss; |
62 |
|
63 |
rtt = tcpi.tcpi_rtt; |
64 |
rttvar = tcpi.tcpi_rttvar; |
65 |
|
66 |
if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
67 |
{ |
68 |
send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
69 |
write_outputbuffer (); |
70 |
|
71 |
LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
72 |
(unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
73 |
destroy (); |
74 |
} |
75 |
} |
76 |
} |
77 |
#endif |
78 |
|
79 |
/** |
80 |
* Writes data to socket. |
81 |
* |
82 |
* When the socket is clear to write, and we have backlogged data, this |
83 |
* is called to write it out. |
84 |
*/ |
85 |
|
86 |
// write a nop to the socket at least every IDLE_NOP seconds. |
87 |
if (!outputbuffer.len) |
88 |
{ |
89 |
if (last_send + IDLE_PING <= NOW && pl && pl->active) |
90 |
{ |
91 |
// this is a bit ugly, but map1/map1a seem to be the only |
92 |
// nop'able commands and they are quite small. |
93 |
packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
94 |
send_packet (sl); |
95 |
} |
96 |
else |
97 |
return; |
98 |
} |
99 |
|
100 |
if (socket_ev.poll () & PE_W) |
101 |
return; |
102 |
|
103 |
last_send = NOW; |
104 |
write_outputbuffer (); |
105 |
} |
106 |
|
107 |
void |
108 |
client::write_outputbuffer () |
109 |
{ |
110 |
while (outputbuffer.len) |
111 |
{ |
112 |
int res = write (fd, outputbuffer.data + outputbuffer.start, |
113 |
min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); |
114 |
|
115 |
if (res > 0) |
116 |
{ |
117 |
outputbuffer.start += res; |
118 |
/* wrap back to start of buffer */ |
119 |
if (outputbuffer.start == SOCKETBUFSIZE) |
120 |
outputbuffer.start = 0; |
121 |
|
122 |
outputbuffer.len -= res; |
123 |
} |
124 |
else if (res == 0) |
125 |
{ |
126 |
LOG (llevError, "socket write failed, connection closed.\n"); |
127 |
destroy (); |
128 |
return; |
129 |
} |
130 |
else if (errno == EINTR) |
131 |
{ |
132 |
// just retry |
133 |
} |
134 |
else if (errno == EAGAIN) |
135 |
{ |
136 |
// delay till ready |
137 |
socket_ev.poll (socket_ev.poll () | PE_W); |
138 |
socket_ev.start (); |
139 |
return; |
140 |
} |
141 |
else |
142 |
{ |
143 |
LOG (llevError, "socket write failed: %s\n", strerror (errno)); |
144 |
destroy (); |
145 |
return; |
146 |
} |
147 |
} |
148 |
|
149 |
socket_ev.poll (socket_ev.poll () & ~PE_W); |
150 |
} |
151 |
|
152 |
/****************************************************************************** |
153 |
* |
154 |
* Start of read routines. |
155 |
* |
156 |
******************************************************************************/ |
157 |
|
158 |
int |
159 |
client::next_packet () |
160 |
{ |
161 |
if (inbuf_len >= 2) |
162 |
{ |
163 |
int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
164 |
|
165 |
if (inbuf_len >= 2 + pkt_len) |
166 |
return 2 + pkt_len; |
167 |
|
168 |
if (inbuf_len == sizeof (inbuf)) |
169 |
{ |
170 |
send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
171 |
destroy (); |
172 |
return -1; |
173 |
} |
174 |
} |
175 |
|
176 |
return 0; |
177 |
} |
178 |
|
179 |
void |
180 |
client::skip_packet (int len) |
181 |
{ |
182 |
inbuf_len -= len; |
183 |
memmove (inbuf, inbuf + len, inbuf_len); |
184 |
} |
185 |
|
186 |
/***************************************************************************** |
187 |
* Start of command dispatch area. |
188 |
* The commands here are protocol commands. |
189 |
****************************************************************************/ |
190 |
|
191 |
// SocketCommand, PlayingCommand, should not exist with those ugly casts |
192 |
#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb), |
193 |
#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | |
194 |
|
195 |
/** |
196 |
* Dispatch table for the server. |
197 |
*/ |
198 |
static struct packet_type packets[] = { |
199 |
{"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
200 |
{"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
201 |
|
202 |
{"examine", PC(ExamineCmd) PF_PLAYING }, |
203 |
{"ex", PC(ExCmd) PF_PLAYING }, |
204 |
{"apply", PC(ApplyCmd) PF_PLAYING }, |
205 |
{"lookat", PC(LookAt) PF_PLAYING }, |
206 |
{"lock", PC(LockItem) PF_PLAYING }, |
207 |
{"mark", PC(MarkItem) PF_PLAYING }, |
208 |
{"move", PC(MoveCmd) PF_PLAYING }, |
209 |
{"ext", PC(ExtCmd) 0 }, // CF+ |
210 |
{"mapredraw", PC(MapRedrawCmd) 0 }, |
211 |
{"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
212 |
|
213 |
{"reply", SC(ReplyCmd) 0 }, |
214 |
{"exti", SC(ExtiCmd) 0 }, // CF+ |
215 |
{"addme", SC(AddMeCmd) 0 }, |
216 |
{"askface", SC(AskFaceCmd) 0 }, |
217 |
{"requestinfo", SC(RequestInfo) 0 }, |
218 |
{"setfacemode", SC(SetFaceMode) 0 }, |
219 |
{"setsound", SC(SetSound) 0 }, |
220 |
{"setup", SC(SetUp) 0 }, |
221 |
{"version", SC(VersionCmd) 0 }, |
222 |
{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
223 |
{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
224 |
{"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
225 |
}; |
226 |
|
227 |
bool |
228 |
client::may_execute (const packet_type *pkt) const |
229 |
{ |
230 |
return (!(pkt->flags & PF_PLAYER) || pl) |
231 |
&& (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
232 |
} |
233 |
|
234 |
// HACK: some commands currently should be executed |
235 |
// even when the player is frozen. this hack detects |
236 |
// those commands. it should be folded into may_execute, |
237 |
// but kept seperate to emphasise the hack aspect, i.e. |
238 |
// do it better, then remove. |
239 |
static bool |
240 |
always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
241 |
{ |
242 |
if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
243 |
return false; |
244 |
|
245 |
if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
246 |
return false; |
247 |
|
248 |
if (pkt->flags & PF_COMMAND6) |
249 |
{ |
250 |
data += 6; |
251 |
len -= 6; |
252 |
} |
253 |
|
254 |
if (len > 4 && !strncmp (data, "say " , 4)) |
255 |
return true; |
256 |
if (len > 5 && !strncmp (data, "chat ", 5)) |
257 |
return true; |
258 |
|
259 |
return false; |
260 |
} |
261 |
|
262 |
void |
263 |
client::execute (const packet_type *pkt, char *data, int datalen) |
264 |
{ |
265 |
if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
266 |
{ |
267 |
//TODO: only one format |
268 |
if (pkt->flags & PF_PLAYER) |
269 |
((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
270 |
else |
271 |
((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
272 |
} |
273 |
else |
274 |
send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
275 |
} |
276 |
|
277 |
bool |
278 |
client::handle_packet () |
279 |
{ |
280 |
int pkt_len = next_packet (); |
281 |
|
282 |
if (!pkt_len) |
283 |
return false; |
284 |
else if (pkt_len < 0) |
285 |
{ |
286 |
LOG (llevError, "read error on player %s\n", |
287 |
pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
288 |
destroy (); |
289 |
return false; |
290 |
} |
291 |
|
292 |
inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
293 |
|
294 |
/* First, break out beginning word. There are at least |
295 |
* a few commands that do not have any paremeters. If |
296 |
* we get such a command, don't worry about trying |
297 |
* to break it up. |
298 |
*/ |
299 |
int datalen; |
300 |
char *data = strchr ((char *)inbuf + 2, ' '); |
301 |
|
302 |
if (data) |
303 |
{ |
304 |
*data++ = 0; |
305 |
datalen = pkt_len - (data - (char *)inbuf); |
306 |
} |
307 |
else |
308 |
{ |
309 |
data = (char *)inbuf + 2; // better read garbage than segfault |
310 |
datalen = 0; |
311 |
} |
312 |
|
313 |
for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
314 |
if (!strcmp ((char *)inbuf + 2, pkt->name)) |
315 |
{ |
316 |
if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
317 |
queue_command (pkt, data, datalen); |
318 |
else |
319 |
execute (pkt, data, datalen); |
320 |
|
321 |
goto next_packet; |
322 |
} |
323 |
|
324 |
// If we get here, we didn't find a valid command. |
325 |
send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
326 |
next_packet: |
327 |
skip_packet (pkt_len); |
328 |
|
329 |
// input buffer has space again |
330 |
socket_ev.poll (socket_ev.poll () | PE_R); |
331 |
|
332 |
return true; |
333 |
} |
334 |
|
335 |
// callback called when socket is either readable or writable |
336 |
void |
337 |
client::socket_cb (iow &w, int got) |
338 |
{ |
339 |
//TODO remove when we have better socket cleanup logic |
340 |
if (destroyed ()) |
341 |
{ |
342 |
socket_ev.poll (0); |
343 |
return; |
344 |
} |
345 |
|
346 |
if (got & PE_W) |
347 |
{ |
348 |
write_outputbuffer (); |
349 |
|
350 |
if (!outputbuffer.len) |
351 |
socket_ev.poll (socket_ev.poll () & ~PE_W); |
352 |
} |
353 |
|
354 |
if (got & PE_R) |
355 |
{ |
356 |
//TODO: rate-limit tcp connection in better ways, important |
357 |
|
358 |
int amount = sizeof (inbuf) - inbuf_len; |
359 |
|
360 |
if (!amount) |
361 |
{ |
362 |
// input buffer full |
363 |
socket_ev.poll (socket_ev.poll () & ~PE_R); |
364 |
return; |
365 |
} |
366 |
|
367 |
amount = read (fd, inbuf + inbuf_len, amount); |
368 |
|
369 |
if (!amount) |
370 |
{ |
371 |
destroy (); |
372 |
return; |
373 |
} |
374 |
else if (amount < 0) |
375 |
{ |
376 |
if (errno != EAGAIN && errno != EINTR) |
377 |
{ |
378 |
LOG (llevError, "read error: %s\n", strerror (errno)); |
379 |
destroy (); |
380 |
return; |
381 |
} |
382 |
|
383 |
// should not be here, normally |
384 |
} |
385 |
else |
386 |
{ |
387 |
inbuf_len += amount; |
388 |
|
389 |
cmd_ev.start (); |
390 |
} |
391 |
} |
392 |
} |
393 |
|
394 |
// called whenever we have additional commands to process |
395 |
void |
396 |
client::cmd_cb (iw &w) |
397 |
{ |
398 |
if (handle_packet ()) |
399 |
w.start (); |
400 |
else |
401 |
flush (); |
402 |
} |
403 |
|
404 |
/******************************************************************************* |
405 |
* |
406 |
* Start of write related routines. |
407 |
* |
408 |
******************************************************************************/ |
409 |
|
410 |
/** |
411 |
* Adds data to a socket buffer for whatever reason. |
412 |
* |
413 |
* ns is the socket we are adding the data to, buf is the start of the |
414 |
* data, and len is the number of bytes to add. |
415 |
*/ |
416 |
void |
417 |
client::send (void *buf_, int len) |
418 |
{ |
419 |
char *buf = (char *)buf_; |
420 |
|
421 |
if (destroyed () || !buf) |
422 |
return; |
423 |
|
424 |
if (len + outputbuffer.len > SOCKETBUFSIZE) |
425 |
{ |
426 |
LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
427 |
// shutdown the socket, this is safer than destroying it immediately |
428 |
// as lots of code in the callchain might still access the map etc. |
429 |
shutdown (fd, SHUT_RDWR); |
430 |
return; |
431 |
} |
432 |
|
433 |
int avail, end; |
434 |
|
435 |
/* data + end is where we start putting the new data. The last byte |
436 |
* currently in use is actually data + end -1 |
437 |
*/ |
438 |
end = outputbuffer.start + outputbuffer.len; |
439 |
/* The buffer is already in a wrapped state, so adjust end */ |
440 |
if (end >= SOCKETBUFSIZE) |
441 |
end -= SOCKETBUFSIZE; |
442 |
|
443 |
avail = SOCKETBUFSIZE - end; |
444 |
|
445 |
/* We can all fit it behind the current data without wrapping */ |
446 |
if (avail >= len) |
447 |
memcpy (outputbuffer.data + end, buf, len); |
448 |
else |
449 |
{ |
450 |
memcpy (outputbuffer.data + end, buf, avail); |
451 |
memcpy (outputbuffer.data, buf + avail, len - avail); |
452 |
} |
453 |
|
454 |
outputbuffer.len += len; |
455 |
} |
456 |
|
457 |
/** |
458 |
* Takes a string of data, and writes it out to the socket. A very handy |
459 |
* shortcut function. |
460 |
*/ |
461 |
void |
462 |
client::send_packet (packet &sl) |
463 |
{ |
464 |
if (destroyed ()) |
465 |
return; |
466 |
|
467 |
if (sl.length () >= MAXSOCKBUF) |
468 |
{ |
469 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
470 |
/* Almost certainly we've overflowed a buffer, so quit now to make |
471 |
* it easier to debug. |
472 |
*/ |
473 |
abort (); |
474 |
} |
475 |
|
476 |
if (!sl.length ()) |
477 |
return; |
478 |
|
479 |
assert (sl.hdrlen == 2); |
480 |
|
481 |
sl.buf_ [0] = sl.length () >> 8; |
482 |
sl.buf_ [1] = sl.length () ; |
483 |
|
484 |
send (sl.buf_, sl.length () + sl.hdrlen); |
485 |
} |
486 |
|
487 |
void |
488 |
client::send_packet (const char *buf, int len) |
489 |
{ |
490 |
packet sl; |
491 |
|
492 |
sl << data (buf, len); |
493 |
send_packet (sl); |
494 |
} |
495 |
|
496 |
void |
497 |
client::send_packet (const char *buf) |
498 |
{ |
499 |
send_packet (buf, strlen (buf)); |
500 |
} |
501 |
|
502 |
void |
503 |
client::send_packet_printf (const char *format, ...) |
504 |
{ |
505 |
packet sl; |
506 |
|
507 |
va_list ap; |
508 |
va_start (ap, format); |
509 |
sl.vprintf (format, ap); |
510 |
va_end (ap); |
511 |
|
512 |
send_packet (sl); |
513 |
} |
514 |
|
515 |
// returns true when the message needs special (read: perl) treatment |
516 |
static bool |
517 |
msg_is_special (const char *msg) |
518 |
{ |
519 |
return msg [strcspn (msg, "<[&\n")]; |
520 |
} |
521 |
|
522 |
void |
523 |
client::send_msg (int color, const char *type, const char *msg) |
524 |
{ |
525 |
if (msg_is_special (msg)) |
526 |
cfperl_send_msg (this, color, type, msg); |
527 |
else if (can_msg) |
528 |
send_packet_printf ("msg %d %s %s", color, type, msg); |
529 |
else if (color < 0) |
530 |
return; // client cannot handle this |
531 |
else |
532 |
send_packet_printf ("drawinfo %d %s", color, msg); |
533 |
} |
534 |
|
535 |
void |
536 |
client::send_drawinfo (const char *msg, int flags) |
537 |
{ |
538 |
send_msg (flags, "log", msg); |
539 |
} |
540 |
|
541 |
/*********************************************************************** |
542 |
* |
543 |
* packet functions/utilities |
544 |
* |
545 |
**********************************************************************/ |
546 |
|
547 |
packet::packet (const char *name) |
548 |
{ |
549 |
reset (); |
550 |
|
551 |
int len = strlen (name); |
552 |
memcpy (cur, name, len); cur += len; |
553 |
*cur++ = ' '; |
554 |
} |
555 |
|
556 |
packet &packet::operator <<(const ber32 v) |
557 |
{ |
558 |
enum { maxlen = 32 / 7 + 1}; |
559 |
uint8 buf[maxlen]; |
560 |
uint8 *p = buf + maxlen; |
561 |
uint32 val = v.val; |
562 |
|
563 |
*--p = val & 0x7F; |
564 |
|
565 |
while (val > 0x7F) |
566 |
{ |
567 |
val >>= 7; |
568 |
*--p = (val & 0x7F) | 0x80; |
569 |
} |
570 |
|
571 |
return *this << data (p, buf + maxlen - p); |
572 |
} |
573 |
|
574 |
packet &packet::operator <<(const data &v) |
575 |
{ |
576 |
if (room () < v.len) |
577 |
reset (); |
578 |
else |
579 |
{ |
580 |
if (v.len) |
581 |
{ |
582 |
memcpy (cur, v.ptr, v.len); |
583 |
cur += v.len; |
584 |
} |
585 |
} |
586 |
|
587 |
return *this; |
588 |
} |
589 |
|
590 |
packet &packet::operator <<(const data8 &v) |
591 |
{ |
592 |
unsigned int len = min (v.len, 0x00FF); |
593 |
return *this << uint8 (len) << data (v.ptr, len); |
594 |
} |
595 |
|
596 |
packet &packet::operator <<(const data16 &v) |
597 |
{ |
598 |
unsigned int len = min (v.len, 0xFFFF); |
599 |
return *this << uint16 (len) << data (v.ptr, len); |
600 |
} |
601 |
|
602 |
packet &packet::operator <<(const char *v) |
603 |
{ |
604 |
return *this << data (v, strlen (v ? v : 0)); |
605 |
} |
606 |
|
607 |
void |
608 |
packet::vprintf (const char *format, va_list ap) |
609 |
{ |
610 |
int size = room (); |
611 |
|
612 |
int len = vsnprintf ((char *)cur, size, format, ap); |
613 |
|
614 |
if (len >= size) |
615 |
return reset (); |
616 |
|
617 |
cur += len; |
618 |
} |
619 |
|