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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 1.45 by root, Sun Jun 10 02:51:46 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
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 it
7 it under the terms of the GNU General Public License as published by 8 * under the terms of the GNU General Public License as published by the Free
8 the Free Software Foundation; either version 2 of the License, or 9 * Software Foundation; either version 2 of the License, or (at your option)
9 (at your option) any later version. 10 * 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, but
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 GNU General Public License for more details. 15 * 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 along
17 along with this program; if not, write to the Free Software 18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 * 20 *
27 * \date 2003-12-02 21 * 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 */ 22 */
34 23
35using namespace std; 24using namespace std;
36 25
37#include <global.h> 26#include <global.h>
38#include <sproto.h> 27#include <sproto.h>
39#include <cstdarg> 28#include <cstdarg>
40 29
41#ifdef __linux__ 30#if HAVE_TCP_INFO
42# include <sys/types.h> 31# include <sys/types.h>
43# include <sys/socket.h> 32# include <sys/socket.h>
44# include <netinet/in.h> 33# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 34# include <netinet/tcp.h>
47#endif 35#endif
48 36
49// use a really low timeout, as it doesn't cost any bandwidth, and you can 37// disconnect a socket after this many seconds without an ack
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 38#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20 39
40// force a packet when idle for more than this many seconds,
41// forcing an ack regularly.
42#define IDLE_PING 2.
53 43
54void 44void
55client::flush () 45client::flush ()
56{ 46{
57#ifdef __linux__ 47 if (destroyed ())
48 return;
49
50#if HAVE_TCP_INFO
51 // check about once per second, spread evenly over all clients
52 if (!((pticks + fd) & 7))
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;
65
66 rtt = tcpi.tcpi_rtt; 60 rtt = tcpi.tcpi_rtt;
67 rttvar = tcpi.tcpi_rttvar; 61 rttvar = tcpi.tcpi_rttvar;
68 62
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 63 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 { 64 {
65 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
66 write_outputbuffer ();
67
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 68 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); 69 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74 status = Ns_Dead; 70 destroy ();
71 }
75 } 72 }
76 } 73 }
77#endif 74#endif
78 75
79 /** 76 /**
… …
81 * 78 *
82 * When the socket is clear to write, and we have backlogged data, this 79 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 80 * is called to write it out.
84 */ 81 */
85 82
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 83 // write a nop to the socket at least every IDLE_NOP seconds.
84 if (!outputbuffer.len)
85 {
86 if (last_send + IDLE_PING <= NOW)
87 {
88 // this is a bit ugly, but map1/map1a seem to be the only
89 // nop'able commands and they are quite small.
90 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
91 send_packet (sl);
92 }
93 else
94 return;
95 }
96
97 if (socket_ev.poll () & PE_W)
87 return; 98 return;
88 99
100 last_send = NOW;
89 write_outputbuffer (); 101 write_outputbuffer ();
90} 102}
91 103
92void 104void
93client::write_outputbuffer () 105client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 115 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 116 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 117 outputbuffer.start = 0;
106 118
107 outputbuffer.len -= res; 119 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 120 }
113 else if (res == 0) 121 else if (res == 0)
114 { 122 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 123 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead; 124 destroy ();
117 return; 125 return;
118 } 126 }
119 else if (errno == EINTR) 127 else if (errno == EINTR)
120 { 128 {
121 // just retry 129 // just retry
… …
128 return; 136 return;
129 } 137 }
130 else 138 else
131 { 139 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 140 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead; 141 destroy ();
134 return; 142 return;
135 } 143 }
136 } 144 }
137 145
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 146 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} 147}
195 148
196/****************************************************************************** 149/******************************************************************************
197 * 150 *
198 * Start of read routines. 151 * Start of read routines.
199 * 152 *
200 ******************************************************************************/ 153 ******************************************************************************/
201 154
202int 155int
203client::read_packet () 156client::next_packet ()
204{ 157{
205 for (;;)
206 {
207 if (inbuf_len >= 2) 158 if (inbuf_len >= 2)
208 { 159 {
209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 160 int pkt_len = (inbuf [0] << 8) | inbuf [1];
210 161
211 if (inbuf_len >= 2 + pkt_len) 162 if (inbuf_len >= 2 + pkt_len)
212 return pkt_len + 2; 163 return 2 + pkt_len;
164
165 if (inbuf_len == sizeof (inbuf))
213 } 166 {
167 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
168 destroy ();
169 return -1;
170 }
171 }
172
173 return 0;
174}
175
176void
177client::skip_packet (int len)
178{
179 inbuf_len -= len;
180 memmove (inbuf, inbuf + len, inbuf_len);
181}
182
183/*****************************************************************************
184 * Start of command dispatch area.
185 * The commands here are protocol commands.
186 ****************************************************************************/
187
188// SocketCommand, PlayingCommand, should not exist with those ugly casts
189#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
190#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
191
192/**
193 * Dispatch table for the server.
194 */
195static struct packet_type packets[] = {
196 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
197 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
198
199 {"examine", PC(ExamineCmd) PF_PLAYING },
200 {"ex", PC(ExCmd) PF_PLAYING },
201 {"apply", PC(ApplyCmd) PF_PLAYING },
202 {"lookat", PC(LookAt) PF_PLAYING },
203 {"lock", PC(LockItem) PF_PLAYING },
204 {"mark", PC(MarkItem) PF_PLAYING },
205 {"move", PC(MoveCmd) PF_PLAYING },
206 {"ext", PC(ExtCmd) 0 }, // CF+
207 {"mapredraw", PC(MapRedrawCmd) 0 },
208 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
209
210 {"reply", SC(ReplyCmd) 0 },
211 {"exti", SC(ExtiCmd) 0 }, // CF+
212 {"addme", SC(AddMeCmd) 0 },
213 {"askface", SC(AskFaceCmd) 0 },
214 {"requestinfo", SC(RequestInfo) 0 },
215 {"setfacemode", SC(SetFaceMode) 0 },
216 {"setsound", SC(SetSound) 0 },
217 {"setup", SC(SetUp) 0 },
218 {"version", SC(VersionCmd) 0 },
219 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
220 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
221 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
222};
223
224bool
225client::may_execute (const packet_type *pkt) const
226{
227 return (!(pkt->flags & PF_PLAYER) || pl)
228 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
229}
230
231// HACK: some commands currently should be executed
232// even when the player is frozen. this hack detects
233// those commands. it should be folded into may_execute,
234// but kept seperate to emphasise the hack aspect, i.e.
235// do it better, then remove.
236static bool
237always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
238{
239 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
240 return false;
241
242 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
243 return false;
244
245 if (pkt->flags & PF_COMMAND6)
246 {
247 data += 6;
248 len -= 6;
249 }
250
251 if (len > 4 && !strncmp (data, "say " , 4))
252 return true;
253 if (len > 5 && !strncmp (data, "chat ", 5))
254 return true;
255
256 return false;
257}
258
259void
260client::execute (const packet_type *pkt, char *data, int datalen)
261{
262 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
263 {
264 //TODO: only one format
265 if (pkt->flags & PF_PLAYER)
266 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
267 else
268 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
269 }
270 else
271 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
272}
273
274bool
275client::handle_packet ()
276{
277 int pkt_len = next_packet ();
278
279 if (!pkt_len)
280 return false;
281 else if (pkt_len < 0)
282 {
283 LOG (llevError, "read error on player %s\n",
284 pl && pl->ob ? &pl->ob->name : "[anonymous]");
285 destroy ();
286 return false;
287 }
288
289 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
290
291 /* First, break out beginning word. There are at least
292 * a few commands that do not have any paremeters. If
293 * we get such a command, don't worry about trying
294 * to break it up.
295 */
296 int datalen;
297 char *data = strchr ((char *)inbuf + 2, ' ');
298
299 if (data)
300 {
301 *data++ = 0;
302 datalen = pkt_len - (data - (char *)inbuf);
303 }
304 else
305 {
306 data = (char *)inbuf + 2; // better read garbage than segfault
307 datalen = 0;
308 }
309
310 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
311 if (!strcmp ((char *)inbuf + 2, pkt->name))
312 {
313 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
314 queue_command (pkt, data, datalen);
315 else
316 execute (pkt, data, datalen);
317
318 goto next_packet;
319 }
320
321 // If we get here, we didn't find a valid command.
322 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
323next_packet:
324 skip_packet (pkt_len);
325
326 // input buffer has space again
327 socket_ev.poll (socket_ev.poll () | PE_R);
328
329 return true;
330}
331
332// callback called when socket is either readable or writable
333void
334client::socket_cb (iow &w, int got)
335{
336 //TODO remove when we have better socket cleanup logic
337 if (destroyed ())
338 {
339 socket_ev.poll (0);
340 return;
341 }
342
343 if (got & PE_W)
344 {
345 write_outputbuffer ();
346
347 if (!outputbuffer.len)
348 socket_ev.poll (socket_ev.poll () & ~PE_W);
349 }
350
351 if (got & PE_R)
352 {
353 //TODO: rate-limit tcp connection in better ways, important
214 354
215 int amount = sizeof (inbuf) - inbuf_len; 355 int amount = sizeof (inbuf) - inbuf_len;
216 356
217 if (amount <= 0) 357 if (!amount)
218 { 358 {
219 LOG (llevError, "packet too large");//TODO 359 // input buffer full
360 socket_ev.poll (socket_ev.poll () & ~PE_R);
220 return -1; 361 return;
221 } 362 }
222 363
223 amount = read (fd, inbuf + inbuf_len, amount); 364 amount = read (fd, inbuf + inbuf_len, amount);
224 365
225 if (!amount) 366 if (!amount)
226 { 367 {
227 status = Ns_Dead; 368 destroy ();
228 return -1; 369 return;
229 } 370 }
230 else if (amount < 0) 371 else if (amount < 0)
231 { 372 {
232 if (errno != EAGAIN && errno != EINTR) 373 if (errno != EAGAIN && errno != EINTR)
233 { 374 {
234 LOG (llevError, "read error: %s\n", strerror (errno)); 375 LOG (llevError, "read error: %s\n", strerror (errno));
376 destroy ();
235 return -1; 377 return;
236 } 378 }
237 379
238 return 0; 380 // should not be here, normally
381 }
382 else
239 } 383 {
240
241 inbuf_len += amount; 384 inbuf_len += amount;
242 385
243 cst_tot.ibytes += amount; 386 cmd_ev.start ();
244 cst_lst.ibytes += amount; 387 }
245 } 388 }
246} 389}
247 390
391// called whenever we have additional commands to process
248void 392void
249client::skip_packet (int len) 393client::cmd_cb (iw &w)
250{ 394{
251 inbuf_len -= len; 395 if (handle_packet ())
252 memmove (inbuf, inbuf + len, inbuf_len); 396 w.start ();
397 else
398 flush ();
253} 399}
254 400
255/******************************************************************************* 401/*******************************************************************************
256 * 402 *
257 * Start of write related routines. 403 * Start of write related routines.
… …
266 */ 412 */
267void 413void
268client::send (void *buf_, int len) 414client::send (void *buf_, int len)
269{ 415{
270 char *buf = (char *)buf_; 416 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273 417
274 if (status == Ns_Dead || !buf) 418 if (destroyed () || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return; 419 return;
278 }
279 420
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 421 if (len + outputbuffer.len > SOCKETBUFSIZE)
281 { 422 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 423 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead; 424 // shutdown the socket, this is safer than destroying it immediately
425 // as lots of code in the callchain might still access the map etc.
426 shutdown (fd, SHUT_RDWR);
284 return; 427 return;
285 } 428 }
286 429
287 int avail, end; 430 int avail, end;
288 431
… …
306 } 449 }
307 450
308 outputbuffer.len += len; 451 outputbuffer.len += len;
309} 452}
310 453
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/** 454/**
321 * Takes a string of data, and writes it out to the socket. A very handy 455 * Takes a string of data, and writes it out to the socket. A very handy
322 * shortcut function. 456 * shortcut function.
323 */ 457 */
324void 458void
325client::send_packet (packet &sl) 459client::send_packet (packet &sl)
326{ 460{
327 if (status == Ns_Dead) 461 if (destroyed ())
328 return; 462 return;
329 463
330 if (sl.length () >= MAXSOCKBUF) 464 if (sl.length () >= MAXSOCKBUF)
331 { 465 {
332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 466 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
360client::send_packet (const char *buf) 494client::send_packet (const char *buf)
361{ 495{
362 send_packet (buf, strlen (buf)); 496 send_packet (buf, strlen (buf));
363} 497}
364 498
499void
500client::send_packet_printf (const char *format, ...)
501{
502 packet sl;
503
504 va_list ap;
505 va_start (ap, format);
506 sl.vprintf (format, ap);
507 va_end (ap);
508
509 send_packet (sl);
510}
511
512void
513client::send_drawinfo (const char *msg, int flags)
514{
515 send_packet_printf ("drawinfo %d %s", flags, msg);
516}
517
518void
519client::send_msg (int color, const char *type, const char *msg)
520{
521 if (can_msg)
522 send_packet_printf ("msg %d %s %s", color, type, msg);
523 else if (color < 0)
524 return; // client cannot handle this
525 else if (strchr (msg, '<') || strchr (msg, '&'))
526 {
527 //TODO: should escape/modify to old syntax
528 send_packet_printf ("drawinfo %d %s", color, msg);
529 }
530 else
531 send_packet_printf ("drawinfo %d %s", color, msg);
532}
533
365/****************************************************************************** 534/***********************************************************************
366 * 535 *
367 * statistics logging functions. 536 * packet functions/utilities
368 * 537 *
369 ******************************************************************************/ 538 **********************************************************************/
370 539
371#ifdef CS_LOGSTATS 540packet::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{ 541{
384 time_t now = time (NULL); 542 reset ();
385 543
386 /* If no connections recently, don't both to log anything */ 544 int len = strlen (name);
387 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 545 memcpy (cur, name, len); cur += len;
388 return; 546 *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} 547}
398#endif
399 548
549packet &packet::operator <<(const ber32 v)
550{
551 enum { maxlen = 32 / 7 + 1};
552 uint8 buf[maxlen];
553 uint8 *p = buf + maxlen;
554 uint32 val = v.val;
555
556 *--p = val & 0x7F;
557
558 while (val > 0x7F)
559 {
560 val >>= 7;
561 *--p = (val & 0x7F) | 0x80;
562 }
563
564 return *this << data (p, buf + maxlen - p);
565}
566
567packet &packet::operator <<(const data &v)
568{
569 if (room () < v.len)
570 reset ();
571 else
572 {
573 if (v.len)
574 {
575 memcpy (cur, v.ptr, v.len);
576 cur += v.len;
577 }
578 }
579
580 return *this;
581}
582
583packet &packet::operator <<(const data8 &v)
584{
585 unsigned int len = min (v.len, 0x00FF);
586 return *this << uint8 (len) << data (v.ptr, len);
587}
588
589packet &packet::operator <<(const data16 &v)
590{
591 unsigned int len = min (v.len, 0xFFFF);
592 return *this << uint16 (len) << data (v.ptr, len);
593}
594
595packet &packet::operator <<(const char *v)
596{
597 return *this << data (v, strlen (v ? v : 0));
598}
599
600void
601packet::vprintf (const char *format, va_list ap)
602{
603 int size = room ();
604
605 int len = vsnprintf ((char *)cur, size, format, ap);
606
607 if (len >= size)
608 return reset ();
609
610 cur += len;
611}
612

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