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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.22 by root, Fri Dec 15 19:59:20 2006 UTC vs.
Revision 1.52 by root, Sat Jul 28 00:15:18 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
5 6 *
6 This program is free software; you can redistribute it and/or modify 7 * Crossfire TRT is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by 8 * it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or 9 * the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version. 10 * (at your option) any later version.
10 11 *
11 This program is distributed in the hope that it will be useful, 12 * This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details. 15 * GNU General Public License for more details.
15 16 *
16 You should have received a copy of the GNU General Public License 17 * You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software 18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 <crossfire@schmorp.de>
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 <sproto.h> 26#include <sproto.h>
39#include <cstdarg> 27#include <cstdarg>
40 28
41#ifdef __linux__ 29#if HAVE_TCP_INFO
42# include <sys/types.h> 30# include <sys/types.h>
43# include <sys/socket.h> 31# include <sys/socket.h>
44# include <netinet/in.h> 32# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 33# include <netinet/tcp.h>
47#endif 34#endif
48 35
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// disconnect a socket after this many seconds without an ack
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 37#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 38
39// force a packet when idle for more than this many seconds,
40// forcing an ack regularly.
41#define IDLE_PING 2.
53 42
54void 43void
55client::flush () 44client::flush ()
56{ 45{
57#ifdef __linux__ 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 {
58 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 55 socklen_t len = sizeof (tcpi);
61 56
62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 57 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 58 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 59 if (tcpi.tcpi_snd_mss)
60 mss = tcpi.tcpi_snd_mss;
65 61
66 rtt = tcpi.tcpi_rtt; 62 //fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n",
67 rttvar = tcpi.tcpi_rttvar; 63 // tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu);
68 64
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 65 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
71 { 66 {
67 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
68 write_outputbuffer ();
69
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 70 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
73 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 71 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74 status = Ns_Dead; 72 destroy ();
73 }
75 } 74 }
76 } 75 }
77#endif 76#endif
78 77
79 /** 78 /**
… …
81 * 80 *
82 * When the socket is clear to write, and we have backlogged data, this 81 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 82 * is called to write it out.
84 */ 83 */
85 84
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 85 // write a nop to the socket at least every IDLE_NOP seconds.
86 if (!outputbuffer.len)
87 {
88 if (last_send + IDLE_PING <= NOW && pl && pl->active)
89 {
90 // this is a bit ugly, but map1/map1a seem to be the only
91 // nop'able commands and they are quite small.
92 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
93 send_packet (sl);
94 }
95 else
96 return;
97 }
98
99 if (socket_ev.poll () & PE_W)
87 return; 100 return;
88 101
102 last_send = NOW;
89 write_outputbuffer (); 103 write_outputbuffer ();
90} 104}
91 105
92void 106void
93client::write_outputbuffer () 107client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 117 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 118 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 119 outputbuffer.start = 0;
106 120
107 outputbuffer.len -= res; 121 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 122 }
113 else if (res == 0) 123 else if (res == 0)
114 { 124 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 125 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead; 126 destroy ();
117 return; 127 return;
118 } 128 }
119 else if (errno == EINTR) 129 else if (errno == EINTR)
120 { 130 {
121 // just retry 131 // just retry
… …
128 return; 138 return;
129 } 139 }
130 else 140 else
131 { 141 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 142 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead; 143 destroy ();
134 return; 144 return;
135 } 145 }
136 } 146 }
137 147
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 148 socket_ev.poll (socket_ev.poll () & ~PE_W);
139}
140
141/***********************************************************************
142 *
143 * packet functions/utilities
144 *
145 **********************************************************************/
146
147packet &packet::operator <<(const data &v)
148{
149 if (room () < v.len)
150 reset ();
151 else
152 {
153 if (v.len)
154 {
155 memcpy (cur, v.ptr, v.len);
156 cur += v.len;
157 }
158 }
159
160 return *this;
161}
162
163packet &packet::operator <<(const data8 &v)
164{
165 unsigned int len = min (v.len, 0x00FF);
166 return *this << uint8 (len) << data (v.ptr, len);
167}
168
169packet &packet::operator <<(const data16 &v)
170{
171 unsigned int len = min (v.len, 0xFFFF);
172 return *this << uint16 (len) << data (v.ptr, len);
173}
174
175packet &packet::operator <<(const char *v)
176{
177 return *this << data (v, strlen (v ? v : 0));
178}
179
180void
181packet::printf (const char *format, ...)
182{
183 int size = room ();
184
185 va_list ap;
186 va_start (ap, format);
187 int len = vsnprintf ((char *)cur, size, format, ap);
188 va_end (ap);
189
190 if (len >= size)
191 return reset ();
192
193 cur += len;
194} 149}
195 150
196/****************************************************************************** 151/******************************************************************************
197 * 152 *
198 * Start of read routines. 153 * Start of read routines.
199 * 154 *
200 ******************************************************************************/ 155 ******************************************************************************/
201 156
202int 157int
203client::read_packet () 158client::next_packet ()
204{ 159{
205 for (;;)
206 {
207 if (inbuf_len >= 2) 160 if (inbuf_len >= 2)
208 { 161 {
209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 162 int pkt_len = (inbuf [0] << 8) | inbuf [1];
210 163
211 if (inbuf_len >= 2 + pkt_len) 164 if (inbuf_len >= 2 + pkt_len)
212 return pkt_len + 2; 165 return 2 + pkt_len;
166
167 if (inbuf_len == sizeof (inbuf))
213 } 168 {
169 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
170 destroy ();
171 return -1;
172 }
173 }
174
175 return 0;
176}
177
178void
179client::skip_packet (int len)
180{
181 inbuf_len -= len;
182 memmove (inbuf, inbuf + len, inbuf_len);
183}
184
185/*****************************************************************************
186 * Start of command dispatch area.
187 * The commands here are protocol commands.
188 ****************************************************************************/
189
190// SocketCommand, PlayingCommand, should not exist with those ugly casts
191#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
192#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
193
194/**
195 * Dispatch table for the server.
196 */
197static struct packet_type packets[] = {
198 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
199 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
200
201 {"examine", PC(ExamineCmd) PF_PLAYING },
202 {"ex", PC(ExCmd) PF_PLAYING },
203 {"apply", PC(ApplyCmd) PF_PLAYING },
204 {"lookat", PC(LookAt) PF_PLAYING },
205 {"lock", PC(LockItem) PF_PLAYING },
206 {"mark", PC(MarkItem) PF_PLAYING },
207 {"move", PC(MoveCmd) PF_PLAYING },
208 {"ext", PC(ExtCmd) 0 }, // CF+
209 {"mapredraw", PC(MapRedrawCmd) 0 },
210 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
211
212 {"reply", SC(ReplyCmd) 0 },
213 {"exti", SC(ExtiCmd) 0 }, // CF+
214 {"addme", SC(AddMeCmd) 0 },
215 {"askface", SC(AskFaceCmd) 0 },
216 {"requestinfo", SC(RequestInfo) 0 },
217 {"setfacemode", SC(SetFaceMode) 0 },
218 {"setsound", SC(SetSound) 0 },
219 {"setup", SC(SetUp) 0 },
220 {"version", SC(VersionCmd) 0 },
221 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
222 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
223 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
224};
225
226bool
227client::may_execute (const packet_type *pkt) const
228{
229 return (!(pkt->flags & PF_PLAYER) || pl)
230 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
231}
232
233// HACK: some commands currently should be executed
234// even when the player is frozen. this hack detects
235// those commands. it should be folded into may_execute,
236// but kept seperate to emphasise the hack aspect, i.e.
237// do it better, then remove.
238static bool
239always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
240{
241 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
242 return false;
243
244 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
245 return false;
246
247 if (pkt->flags & PF_COMMAND6)
248 {
249 data += 6;
250 len -= 6;
251 }
252
253 if (len > 4 && !strncmp (data, "say " , 4))
254 return true;
255 if (len > 5 && !strncmp (data, "chat ", 5))
256 return true;
257
258 return false;
259}
260
261void
262client::execute (const packet_type *pkt, char *data, int datalen)
263{
264 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
265 {
266 //TODO: only one format
267 if (pkt->flags & PF_PLAYER)
268 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
269 else
270 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
271 }
272 else
273 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
274}
275
276bool
277client::handle_packet ()
278{
279 int pkt_len = next_packet ();
280
281 if (!pkt_len)
282 return false;
283 else if (pkt_len < 0)
284 {
285 LOG (llevError, "read error on player %s\n",
286 pl && pl->ob ? &pl->ob->name : "[anonymous]");
287 destroy ();
288 return false;
289 }
290
291 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
292
293 /* First, break out beginning word. There are at least
294 * a few commands that do not have any paremeters. If
295 * we get such a command, don't worry about trying
296 * to break it up.
297 */
298 int datalen;
299 char *data = strchr ((char *)inbuf + 2, ' ');
300
301 if (data)
302 {
303 *data++ = 0;
304 datalen = pkt_len - (data - (char *)inbuf);
305 }
306 else
307 {
308 data = (char *)inbuf + 2; // better read garbage than segfault
309 datalen = 0;
310 }
311
312 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
313 if (!strcmp ((char *)inbuf + 2, pkt->name))
314 {
315 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
316 queue_command (pkt, data, datalen);
317 else
318 execute (pkt, data, datalen);
319
320 goto next_packet;
321 }
322
323 // If we get here, we didn't find a valid command.
324 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
325next_packet:
326 skip_packet (pkt_len);
327
328 // input buffer has space again
329 socket_ev.poll (socket_ev.poll () | PE_R);
330
331 return true;
332}
333
334// callback called when socket is either readable or writable
335void
336client::socket_cb (iow &w, int got)
337{
338 //TODO remove when we have better socket cleanup logic
339 if (destroyed ())
340 {
341 socket_ev.poll (0);
342 return;
343 }
344
345 if (got & PE_W)
346 {
347 write_outputbuffer ();
348
349 if (!outputbuffer.len)
350 socket_ev.poll (socket_ev.poll () & ~PE_W);
351 }
352
353 if (got & PE_R)
354 {
355 //TODO: rate-limit tcp connection in better ways, important
214 356
215 int amount = sizeof (inbuf) - inbuf_len; 357 int amount = sizeof (inbuf) - inbuf_len;
216 358
217 if (amount <= 0) 359 if (!amount)
218 { 360 {
219 LOG (llevError, "packet too large");//TODO 361 // input buffer full
362 socket_ev.poll (socket_ev.poll () & ~PE_R);
220 return -1; 363 return;
221 } 364 }
222 365
223 amount = read (fd, inbuf + inbuf_len, amount); 366 amount = read (fd, inbuf + inbuf_len, amount);
224 367
225 if (!amount) 368 if (!amount)
226 { 369 {
227 status = Ns_Dead; 370 destroy ();
228 return -1; 371 return;
229 } 372 }
230 else if (amount < 0) 373 else if (amount < 0)
231 { 374 {
232 if (errno != EAGAIN && errno != EINTR) 375 if (errno != EAGAIN && errno != EINTR)
233 { 376 {
234 LOG (llevError, "read error: %s\n", strerror (errno)); 377 LOG (llevError, "read error: %s\n", strerror (errno));
378 destroy ();
235 return -1; 379 return;
236 } 380 }
237 381
238 return 0; 382 // should not be here, normally
383 }
384 else
239 } 385 {
240
241 inbuf_len += amount; 386 inbuf_len += amount;
242 387
243 cst_tot.ibytes += amount; 388 cmd_ev.start ();
244 cst_lst.ibytes += amount; 389 }
245 } 390 }
246} 391}
247 392
393// called whenever we have additional commands to process
248void 394void
249client::skip_packet (int len) 395client::cmd_cb (iw &w)
250{ 396{
251 inbuf_len -= len; 397 if (handle_packet ())
252 memmove (inbuf, inbuf + len, inbuf_len); 398 w.start ();
399 else
400 flush ();
253} 401}
254 402
255/******************************************************************************* 403/*******************************************************************************
256 * 404 *
257 * Start of write related routines. 405 * Start of write related routines.
… …
266 */ 414 */
267void 415void
268client::send (void *buf_, int len) 416client::send (void *buf_, int len)
269{ 417{
270 char *buf = (char *)buf_; 418 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273 419
274 if (status == Ns_Dead || !buf) 420 if (destroyed () || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return; 421 return;
278 }
279 422
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 423 if (len + outputbuffer.len > SOCKETBUFSIZE)
281 { 424 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 425 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead; 426 // shutdown the socket, this is safer than destroying it immediately
427 // as lots of code in the callchain might still access the map etc.
428 shutdown (fd, SHUT_RDWR);
284 return; 429 return;
285 } 430 }
286 431
287 int avail, end; 432 int avail, end;
288 433
… …
306 } 451 }
307 452
308 outputbuffer.len += len; 453 outputbuffer.len += len;
309} 454}
310 455
311void
312client::socket_cb (iow &w, int got)
313{
314 write_outputbuffer ();
315
316 if (!outputbuffer.len)
317 socket_ev.poll (socket_ev.poll () & ~PE_W);
318}
319
320/** 456/**
321 * Takes a string of data, and writes it out to the socket. A very handy 457 * Takes a string of data, and writes it out to the socket. A very handy
322 * shortcut function. 458 * shortcut function.
323 */ 459 */
324void 460void
325client::send_packet (packet &sl) 461client::send_packet (packet &sl)
326{ 462{
327 if (status == Ns_Dead) 463 if (destroyed ())
328 return; 464 return;
329 465
330 if (sl.length () >= MAXSOCKBUF) 466 if (sl.length () >= MAXSOCKBUF)
331 { 467 {
332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 468 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
360client::send_packet (const char *buf) 496client::send_packet (const char *buf)
361{ 497{
362 send_packet (buf, strlen (buf)); 498 send_packet (buf, strlen (buf));
363} 499}
364 500
501void
502client::send_packet_printf (const char *format, ...)
503{
504 packet sl;
505
506 va_list ap;
507 va_start (ap, format);
508 sl.vprintf (format, ap);
509 va_end (ap);
510
511 send_packet (sl);
512}
513
514// returns true when the message needs special (read: perl) treatment
515static bool
516msg_is_special (const char *msg)
517{
518 return msg [strcspn (msg, "<[&\n")];
519}
520
521void
522client::send_msg (int color, const char *type, const char *msg)
523{
524 if (msg_is_special (msg))
525 cfperl_send_msg (this, color, type, msg);
526 else if (can_msg)
527 send_packet_printf ("msg %d %s %s", color, type, msg);
528 else if (color < 0)
529 return; // client cannot handle this
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
534void
535client::send_drawinfo (const char *msg, int flags)
536{
537 send_msg (flags, "log", msg);
538}
539
365/****************************************************************************** 540/***********************************************************************
366 * 541 *
367 * statistics logging functions. 542 * packet functions/utilities
368 * 543 *
369 ******************************************************************************/ 544 **********************************************************************/
370 545
371#ifdef CS_LOGSTATS 546packet::packet (const char *name)
372
373/* cst_tot is for the life of the server, cst_last is for the last series of
374 * stats
375 */
376CS_Stats cst_tot, cst_lst;
377
378/**
379 * Writes out the gathered stats. We clear cst_lst.
380 */
381void
382write_cs_stats (void)
383{ 547{
384 time_t now = time (NULL); 548 reset ();
385 549
386 /* If no connections recently, don't both to log anything */ 550 int len = strlen (name);
387 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 551 memcpy (cur, name, len); cur += len;
388 return; 552 *cur++ = ' ';
389
390 /* CSSTAT is put in so scripts can easily find the line */
391 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
392 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
393 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
394 cst_lst.ibytes = 0;
395 cst_lst.obytes = 0;
396 cst_lst.time_start = now;
397} 553}
398#endif
399 554
555packet &packet::operator <<(const ber32 v)
556{
557 enum { maxlen = 32 / 7 + 1};
558 uint8 buf[maxlen];
559 uint8 *p = buf + maxlen;
560 uint32 val = v.val;
561
562 *--p = val & 0x7F;
563
564 while (val > 0x7F)
565 {
566 val >>= 7;
567 *--p = (val & 0x7F) | 0x80;
568 }
569
570 return *this << data (p, buf + maxlen - p);
571}
572
573packet &packet::operator <<(const data &v)
574{
575 if (room () < v.len)
576 reset ();
577 else
578 {
579 if (v.len)
580 {
581 memcpy (cur, v.ptr, v.len);
582 cur += v.len;
583 }
584 }
585
586 return *this;
587}
588
589packet &packet::operator <<(const data8 &v)
590{
591 unsigned int len = min (v.len, 0x00FF);
592 return *this << uint8 (len) << data (v.ptr, len);
593}
594
595packet &packet::operator <<(const data16 &v)
596{
597 unsigned int len = min (v.len, 0xFFFF);
598 return *this << uint16 (len) << data (v.ptr, len);
599}
600
601packet &packet::operator <<(const char *v)
602{
603 return *this << data (v, strlen (v ? v : 0));
604}
605
606void
607packet::vprintf (const char *format, va_list ap)
608{
609 int size = room ();
610
611 int len = vsnprintf ((char *)cur, size, format, ap);
612
613 if (len >= size)
614 return reset ();
615
616 cur += len;
617}
618

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