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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 1.49 by root, Sun Jul 1 05:00:20 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; 55 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
61 57
62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 58 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 59 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 60 if (tcpi.tcpi_snd_mss)
61 mss = tcpi.tcpi_snd_mss;
65 62
66 rtt = tcpi.tcpi_rtt; 63 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 64 rttvar = tcpi.tcpi_rttvar;
68 65
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 66 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 { 67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 71 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); 72 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74 status = Ns_Dead; 73 destroy ();
74 }
75 } 75 }
76 } 76 }
77#endif 77#endif
78 78
79 /** 79 /**
… …
81 * 81 *
82 * When the socket is clear to write, and we have backlogged data, this 82 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 83 * is called to write it out.
84 */ 84 */
85 85
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 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)
87 return; 101 return;
88 102
103 last_send = NOW;
89 write_outputbuffer (); 104 write_outputbuffer ();
90} 105}
91 106
92void 107void
93client::write_outputbuffer () 108client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 118 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 119 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 120 outputbuffer.start = 0;
106 121
107 outputbuffer.len -= res; 122 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 123 }
113 else if (res == 0) 124 else if (res == 0)
114 { 125 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 126 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead; 127 destroy ();
117 return; 128 return;
118 } 129 }
119 else if (errno == EINTR) 130 else if (errno == EINTR)
120 { 131 {
121 // just retry 132 // just retry
… …
128 return; 139 return;
129 } 140 }
130 else 141 else
131 { 142 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 143 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead; 144 destroy ();
134 return; 145 return;
135 } 146 }
136 } 147 }
137 148
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 149 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} 150}
195 151
196/****************************************************************************** 152/******************************************************************************
197 * 153 *
198 * Start of read routines. 154 * Start of read routines.
199 * 155 *
200 ******************************************************************************/ 156 ******************************************************************************/
201 157
202int 158int
203client::read_packet () 159client::next_packet ()
204{ 160{
205 for (;;)
206 {
207 if (inbuf_len >= 2) 161 if (inbuf_len >= 2)
208 { 162 {
209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 163 int pkt_len = (inbuf [0] << 8) | inbuf [1];
210 164
211 if (inbuf_len >= 2 + pkt_len) 165 if (inbuf_len >= 2 + pkt_len)
212 return pkt_len + 2; 166 return 2 + pkt_len;
167
168 if (inbuf_len == sizeof (inbuf))
213 } 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
179void
180client::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 */
198static 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
227bool
228client::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.
239static bool
240always_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
262void
263client::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
277bool
278client::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);
326next_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
336void
337client::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
214 357
215 int amount = sizeof (inbuf) - inbuf_len; 358 int amount = sizeof (inbuf) - inbuf_len;
216 359
217 if (amount <= 0) 360 if (!amount)
218 { 361 {
219 LOG (llevError, "packet too large");//TODO 362 // input buffer full
363 socket_ev.poll (socket_ev.poll () & ~PE_R);
220 return -1; 364 return;
221 } 365 }
222 366
223 amount = read (fd, inbuf + inbuf_len, amount); 367 amount = read (fd, inbuf + inbuf_len, amount);
224 368
225 if (!amount) 369 if (!amount)
226 { 370 {
227 status = Ns_Dead; 371 destroy ();
228 return -1; 372 return;
229 } 373 }
230 else if (amount < 0) 374 else if (amount < 0)
231 { 375 {
232 if (errno != EAGAIN && errno != EINTR) 376 if (errno != EAGAIN && errno != EINTR)
233 { 377 {
234 LOG (llevError, "read error: %s\n", strerror (errno)); 378 LOG (llevError, "read error: %s\n", strerror (errno));
379 destroy ();
235 return -1; 380 return;
236 } 381 }
237 382
238 return 0; 383 // should not be here, normally
384 }
385 else
239 } 386 {
240
241 inbuf_len += amount; 387 inbuf_len += amount;
242 388
243 cst_tot.ibytes += amount; 389 cmd_ev.start ();
244 cst_lst.ibytes += amount; 390 }
245 } 391 }
246} 392}
247 393
394// called whenever we have additional commands to process
248void 395void
249client::skip_packet (int len) 396client::cmd_cb (iw &w)
250{ 397{
251 inbuf_len -= len; 398 if (handle_packet ())
252 memmove (inbuf, inbuf + len, inbuf_len); 399 w.start ();
400 else
401 flush ();
253} 402}
254 403
255/******************************************************************************* 404/*******************************************************************************
256 * 405 *
257 * Start of write related routines. 406 * Start of write related routines.
… …
266 */ 415 */
267void 416void
268client::send (void *buf_, int len) 417client::send (void *buf_, int len)
269{ 418{
270 char *buf = (char *)buf_; 419 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273 420
274 if (status == Ns_Dead || !buf) 421 if (destroyed () || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return; 422 return;
278 }
279 423
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 424 if (len + outputbuffer.len > SOCKETBUFSIZE)
281 { 425 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 426 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead; 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);
284 return; 430 return;
285 } 431 }
286 432
287 int avail, end; 433 int avail, end;
288 434
… …
306 } 452 }
307 453
308 outputbuffer.len += len; 454 outputbuffer.len += len;
309} 455}
310 456
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/** 457/**
321 * Takes a string of data, and writes it out to the socket. A very handy 458 * Takes a string of data, and writes it out to the socket. A very handy
322 * shortcut function. 459 * shortcut function.
323 */ 460 */
324void 461void
325client::send_packet (packet &sl) 462client::send_packet (packet &sl)
326{ 463{
327 if (status == Ns_Dead) 464 if (destroyed ())
328 return; 465 return;
329 466
330 if (sl.length () >= MAXSOCKBUF) 467 if (sl.length () >= MAXSOCKBUF)
331 { 468 {
332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 469 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
360client::send_packet (const char *buf) 497client::send_packet (const char *buf)
361{ 498{
362 send_packet (buf, strlen (buf)); 499 send_packet (buf, strlen (buf));
363} 500}
364 501
502void
503client::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
516static bool
517msg_is_special (const char *msg)
518{
519 return msg [strcspn (msg, "<[&\n")];
520}
521
522void
523client::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
535void
536client::send_drawinfo (const char *msg, int flags)
537{
538 send_msg (flags, "log", msg);
539}
540
365/****************************************************************************** 541/***********************************************************************
366 * 542 *
367 * statistics logging functions. 543 * packet functions/utilities
368 * 544 *
369 ******************************************************************************/ 545 **********************************************************************/
370 546
371#ifdef CS_LOGSTATS 547packet::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{ 548{
384 time_t now = time (NULL); 549 reset ();
385 550
386 /* If no connections recently, don't both to log anything */ 551 int len = strlen (name);
387 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 552 memcpy (cur, name, len); cur += len;
388 return; 553 *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} 554}
398#endif
399 555
556packet &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
574packet &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
590packet &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
596packet &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
602packet &packet::operator <<(const char *v)
603{
604 return *this << data (v, strlen (v ? v : 0));
605}
606
607void
608packet::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

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