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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.19 by root, Thu Dec 14 20:39:54 2006 UTC vs.
Revision 1.29 by root, Thu Dec 21 23:37:06 2006 UTC

… …
33 */ 33 */
34 34
35using namespace std; 35using namespace std;
36 36
37#include <global.h> 37#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 38#include <sproto.h>
40#include <cstdarg> 39#include <cstdarg>
41 40
42#ifdef __linux__ 41#ifdef __linux__
43# include <sys/types.h> 42# include <sys/types.h>
44# include <sys/socket.h> 43# include <sys/socket.h>
45# include <netinet/in.h> 44# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 45# include <netinet/tcp.h>
48#endif 46#endif
49 47
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 48// use a really low timeout, as it doesn't cost any bandwidth, and you can
51// easily die in 20 seconds... 49// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 50#define SOCKET_TIMEOUT1 10 * 1000
53#define SOCKET_TIMEOUT2 20 51#define SOCKET_TIMEOUT2 20 * 1000
54 52
55void 53void
56Socket_Flush (client_socket * ns) 54client::flush ()
57{ 55{
56 if (destroyed ())
57 return;
58
58#ifdef __linux__ 59#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection 60 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 61 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 62 socklen_t len = sizeof (tcpi);
62 63
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 64 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 65 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 66 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66 67
68 rtt = tcpi.tcpi_rtt;
69 rttvar = tcpi.tcpi_rttvar;
70
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 71 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 72 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 { 73 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 74 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 75 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead; 76 destroy ();
73 } 77 }
74 } 78 }
75
76 int val;
77
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
80#endif 79#endif
81}
82 80
81 /**
82 * Writes data to socket.
83 *
84 * When the socket is clear to write, and we have backlogged data, this
85 * is called to write it out.
86 */
87
88 if (!outputbuffer.len || socket_ev.poll () & PE_W)
89 return;
90
91 write_outputbuffer ();
92}
93
94void
95client::write_outputbuffer ()
96{
97 while (outputbuffer.len)
98 {
99 int res = write (fd, outputbuffer.data + outputbuffer.start,
100 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
101
102 if (res > 0)
103 {
104 outputbuffer.start += res;
105 /* wrap back to start of buffer */
106 if (outputbuffer.start == SOCKETBUFSIZE)
107 outputbuffer.start = 0;
108
109 outputbuffer.len -= res;
110#ifdef CS_LOGSTATS
111 cst_tot.obytes += res;
112 cst_lst.obytes += res;
113#endif
114 }
115 else if (res == 0)
116 {
117 LOG (llevError, "socket write failed, connection closed.\n");
118 destroy ();
119 return;
120 }
121 else if (errno == EINTR)
122 {
123 // just retry
124 }
125 else if (errno == EAGAIN)
126 {
127 // delay till ready
128 socket_ev.poll (socket_ev.poll () | PE_W);
129 socket_ev.start ();
130 return;
131 }
132 else
133 {
134 LOG (llevError, "socket write failed: %s\n", strerror (errno));
135 destroy ();
136 return;
137 }
138 }
139
140 socket_ev.poll (socket_ev.poll () & ~PE_W);
141}
142
143/******************************************************************************
144 *
145 * Start of read routines.
146 *
147 ******************************************************************************/
148
149int
150client::next_packet ()
151{
152 if (inbuf_len >= 2)
153 {
154 int pkt_len = (inbuf [0] << 8) | inbuf [1];
155
156 if (inbuf_len >= 2 + pkt_len)
157 return 2 + pkt_len;
158
159 if (inbuf_len == sizeof (inbuf))
160 {
161 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
162 destroy ();
163 return -1;
164 }
165 }
166
167 return 0;
168}
169
170void
171client::skip_packet (int len)
172{
173 inbuf_len -= len;
174 memmove (inbuf, inbuf + len, inbuf_len);
175}
176
83/*********************************************************************** 177/*****************************************************************************
84 * 178 * Start of command dispatch area.
85 * packet functions/utilities 179 * The commands here are protocol commands.
86 *
87 **********************************************************************/ 180 ****************************************************************************/
88 181
89packet &packet::operator <<(const data &v) 182// SocketCommand, PlayingCommand, should not exist with those ugly casts
183#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
184#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
185
186/**
187 * Dispatch table for the server.
188 */
189static struct packet_type packets[] = {
190 {"ncom", PC(NewPlayerCmd) PF_PLAYING },
191 {"command", PC(PlayerCmd) PF_PLAYING },
192
193 {"examine", PC(ExamineCmd) PF_PLAYING },
194 {"apply", PC(ApplyCmd) PF_PLAYING },
195 {"lookat", PC(LookAt) PF_PLAYING },
196 {"lock", PC(LockItem) PF_PLAYING },
197 {"mark", PC(MarkItem) PF_PLAYING },
198 {"move", PC(MoveCmd) PF_PLAYING },
199 {"ext", PC(ExtCmd) 0 }, /* CF+ */
200 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
201 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
202
203 {"reply", SC(ReplyCmd) 0 },
204 {"exti", SC(ExtiCmd) 0 }, /* CF+ */
205 {"addme", SC(AddMeCmd) 0 },
206 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
207 {"requestinfo", SC(RequestInfo) 0 },
208 {"setfacemode", SC(SetFaceMode) 0 },
209 {"setsound", SC(SetSound) 0 },
210 {"setup", SC(SetUp) 0 },
211 {"version", SC(VersionCmd) 0 },
212 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
213 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
214 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
215};
216
217bool
218client::may_execute (const packet_type *pkt) const
90{ 219{
91 if (room () < v.len) 220 return (!(pkt->flags & PF_PLAYER) || pl)
92 reset (); 221 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
222}
223
224void
225client::execute (const packet_type *pkt, char *data, int datalen)
226{
227 if (may_execute (pkt))
228 {
229 //TODO: only one format
230 if (pkt->flags & PF_PLAYER)
231 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
232 else
233 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
234 }
93 else 235 else
236 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
237}
238
239bool
240client::handle_packet ()
241{
242 int pkt_len = next_packet ();
243
244 if (!pkt_len)
245 return false;
246 else if (pkt_len < 0)
247 {
248 LOG (llevError, "read error on player %s\n",
249 pl && pl->ob ? &pl->ob->name : "[anonymous]");
250 destroy ();
251 return false;
94 { 252 }
95 if (v.len) 253
254 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
255
256 /* First, break out beginning word. There are at least
257 * a few commands that do not have any paremeters. If
258 * we get such a command, don't worry about trying
259 * to break it up.
260 */
261 int datalen;
262 char *data = strchr ((char *)inbuf + 2, ' ');
263
264 if (data)
265 {
266 *data++ = 0;
267 datalen = pkt_len - (data - (char *)inbuf);
268 }
269 else
270 {
271 data = (char *)inbuf + 2; // better read garbage than segfault
272 datalen = 0;
273 }
274
275 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
276 if (!strcmp ((char *)inbuf + 2, pkt->name))
96 { 277 {
97 memcpy (cur, v.ptr, v.len); 278 if (pkt->flags & PF_PLAYER)
98 cur += v.len; 279 queue_command (pkt, data, datalen);
280 else
281 execute (pkt, data, datalen);
282
283 goto next_packet;
99 } 284 }
285
286 // If we get here, we didn't find a valid command.
287 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
288next_packet:
289 skip_packet (pkt_len);
290
291 // input buffer has space again
292 socket_ev.poll (socket_ev.poll () | PE_R);
293
294 return true;
295}
296
297// callback called when socket is either readable or writable
298void
299client::socket_cb (iow &w, int got)
300{
301 //TODO remove when we have better socket cleanup logic
302 if (destroyed ())
100 } 303 {
101 304 socket_ev.poll (0);
102 return *this; 305 return;
103}
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 { 306 }
149 if (inbuf_len >= 2)
150 {
151 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
152 307
153 if (inbuf_len >= 2 + pkt_len) 308 if (got & PE_W)
154 return pkt_len + 2; 309 {
155 } 310 write_outputbuffer ();
311
312 if (!outputbuffer.len)
313 socket_ev.poll (socket_ev.poll () & ~PE_W);
314 }
315
316 if (got & PE_R)
317 {
318 //TODO: rate-limit tcp connection in better ways, important
156 319
157 int amount = sizeof (inbuf) - inbuf_len; 320 int amount = sizeof (inbuf) - inbuf_len;
158 321
159 if (amount <= 0) 322 if (!amount)
160 { 323 {
161 LOG (llevError, "packet too large");//TODO 324 // input buffer full
325 socket_ev.poll (socket_ev.poll () & ~PE_R);
162 return -1; 326 return;
163 } 327 }
164 328
165 amount = read (fd, inbuf + inbuf_len, amount); 329 amount = read (fd, inbuf + inbuf_len, amount);
166 330
167 if (!amount) 331 if (!amount)
168 { 332 {
169 status = Ns_Dead; 333 destroy ();
170 return -1; 334 return;
171 } 335 }
172 else if (amount < 0) 336 else if (amount < 0)
173 { 337 {
174 if (errno != EAGAIN && errno != EINTR) 338 if (errno != EAGAIN && errno != EINTR)
175 { 339 {
176 LOG (llevError, "read error: %s", strerror (errno)); 340 LOG (llevError, "read error: %s\n", strerror (errno));
341 destroy ();
177 return -1; 342 return;
178 } 343 }
179 344
180 return 0; 345 // should not be here, normally
346 }
347 else
181 } 348 {
182
183 inbuf_len += amount; 349 inbuf_len += amount;
184 350
185 cst_tot.ibytes += amount; 351 cst_tot.ibytes += amount;
186 cst_lst.ibytes += amount; 352 cst_lst.ibytes += amount;
187 }
188}
189 353
354 cmd_ev.start ();
355 }
356 }
357}
358
359// called whenever we have additional commands to process
190void 360void
191client_socket::skip_packet (int len) 361client::cmd_cb (iw &w)
192{ 362{
193 inbuf_len -= len; 363 if (handle_packet ())
194 memmove (inbuf, inbuf + len, inbuf_len); 364 w.start ();
365 else
366 flush ();
195} 367}
196 368
197/******************************************************************************* 369/*******************************************************************************
198 * 370 *
199 * Start of write related routines. 371 * Start of write related routines.
… …
204 * Adds data to a socket buffer for whatever reason. 376 * Adds data to a socket buffer for whatever reason.
205 * 377 *
206 * ns is the socket we are adding the data to, buf is the start of the 378 * 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. 379 * data, and len is the number of bytes to add.
208 */ 380 */
209 381void
210static void 382client::send (void *buf_, int len)
211add_to_buffer (client_socket *ns, char *buf, int len)
212{ 383{
384 char *buf = (char *)buf_;
385 char *pos = buf;
386 int amt = 0;
387
388 if (destroyed () || !buf)
389 return;
390
391 if ((len + outputbuffer.len) > SOCKETBUFSIZE)
392 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 destroy ();
395 return;
396 }
397
213 int avail, end; 398 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 }
221 399
222 /* data + end is where we start putting the new data. The last byte 400 /* data + end is where we start putting the new data. The last byte
223 * currently in use is actually data + end -1 401 * currently in use is actually data + end -1
224 */ 402 */
225
226 end = ns->outputbuffer.start + ns->outputbuffer.len; 403 end = outputbuffer.start + outputbuffer.len;
227 /* The buffer is already in a wrapped state, so adjust end */ 404 /* The buffer is already in a wrapped state, so adjust end */
228 if (end >= SOCKETBUFSIZE) 405 if (end >= SOCKETBUFSIZE)
229 end -= SOCKETBUFSIZE; 406 end -= SOCKETBUFSIZE;
230 407
231 avail = SOCKETBUFSIZE - end; 408 avail = SOCKETBUFSIZE - end;
232 409
233 /* We can all fit it behind the current data without wrapping */ 410 /* We can all fit it behind the current data without wrapping */
234 if (avail >= len) 411 if (avail >= len)
235 memcpy (ns->outputbuffer.data + end, buf, len); 412 memcpy (outputbuffer.data + end, buf, len);
236 else 413 else
237 { 414 {
238 memcpy (ns->outputbuffer.data + end, buf, avail); 415 memcpy (outputbuffer.data + end, buf, avail);
239 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 416 memcpy (outputbuffer.data, buf + avail, len - avail);
240 } 417 }
241 418
242 ns->outputbuffer.len += len; 419 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}
374
375void
376client_socket::socket_cb (iow &w, int got)
377{
378 //printf ("iow got %x\n", got);
379 w.stop ();
380} 420}
381 421
382/** 422/**
383 * Takes a string of data, and writes it out to the socket. A very handy 423 * Takes a string of data, and writes it out to the socket. A very handy
384 * shortcut function. 424 * shortcut function.
385 */ 425 */
386void 426void
387client_socket::send_packet (packet &sl) 427client::send_packet (packet &sl)
388{ 428{
389 if (status == Ns_Dead) 429 if (destroyed ())
390 return; 430 return;
391 431
392 if (sl.length () >= MAXSOCKBUF) 432 if (sl.length () >= MAXSOCKBUF)
393 { 433 {
394 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 434 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
408 448
409 send (sl.buf_, sl.length () + sl.hdrlen); 449 send (sl.buf_, sl.length () + sl.hdrlen);
410} 450}
411 451
412void 452void
413client_socket::send_packet (const char *buf, int len) 453client::send_packet (const char *buf, int len)
414{ 454{
415 packet sl; 455 packet sl;
416 456
417 sl << data (buf, len); 457 sl << data (buf, len);
418 send_packet (sl); 458 send_packet (sl);
419} 459}
420 460
421void 461void
422client_socket::send_packet (const char *buf) 462client::send_packet (const char *buf)
423{ 463{
424 send_packet (buf, strlen (buf)); 464 send_packet (buf, strlen (buf));
465}
466
467void
468client::send_packet_printf (const char *format, ...)
469{
470 packet sl;
471
472 va_list ap;
473 va_start (ap, format);
474 sl.vprintf (format, ap);
475 va_end (ap);
476
477 send_packet (sl);
478}
479
480/***********************************************************************
481 *
482 * packet functions/utilities
483 *
484 **********************************************************************/
485
486packet::packet (const char *name)
487{
488 reset ();
489
490 int len = strlen (name);
491 memcpy (cur, name, len); cur += len;
492 *cur++ = ' ';
493}
494
495packet &packet::operator <<(const data &v)
496{
497 if (room () < v.len)
498 reset ();
499 else
500 {
501 if (v.len)
502 {
503 memcpy (cur, v.ptr, v.len);
504 cur += v.len;
505 }
506 }
507
508 return *this;
509}
510
511packet &packet::operator <<(const data8 &v)
512{
513 unsigned int len = min (v.len, 0x00FF);
514 return *this << uint8 (len) << data (v.ptr, len);
515}
516
517packet &packet::operator <<(const data16 &v)
518{
519 unsigned int len = min (v.len, 0xFFFF);
520 return *this << uint16 (len) << data (v.ptr, len);
521}
522
523packet &packet::operator <<(const char *v)
524{
525 return *this << data (v, strlen (v ? v : 0));
526}
527
528void
529packet::vprintf (const char *format, va_list ap)
530{
531 int size = room ();
532
533 int len = vsnprintf ((char *)cur, size, format, ap);
534
535 if (len >= size)
536 return reset ();
537
538 cur += len;
425} 539}
426 540
427/****************************************************************************** 541/******************************************************************************
428 * 542 *
429 * statistics logging functions. 543 * statistics logging functions.

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