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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 1.55 by root, Sun Jul 29 13:36:40 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
58 // check time of last ack, and, if too old, kill connection 50 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 51 socklen_t len = sizeof (tcpi);
61 52
62 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 53 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
63 { 54 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 55 if (tcpi.tcpi_snd_mss)
56 mss = tcpi.tcpi_snd_mss;
65 57
66 rtt = tcpi.tcpi_rtt; 58#if 0
67 rttvar = tcpi.tcpi_rttvar; 59 fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
60 tcpi.tcpi_unacked,
61 tcpi.tcpi_sacked,
62 tcpi.tcpi_lost,
63 tcpi.tcpi_retrans,
64 tcpi.tcpi_fackets,
65 tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
66
67 tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
68#endif
68 69
69 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 70 // do this only when player is active
70 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 71 if (pl && pl->active
72 && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
71 { 73 {
74 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
75 write_outputbuffer ();
76
72 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 77 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); 78 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
74 status = Ns_Dead; 79 destroy ();
75 } 80 }
76 } 81 }
77#endif 82#endif
78 83
79 /** 84 /**
… …
81 * 86 *
82 * When the socket is clear to write, and we have backlogged data, this 87 * When the socket is clear to write, and we have backlogged data, this
83 * is called to write it out. 88 * is called to write it out.
84 */ 89 */
85 90
86 if (!outputbuffer.len || socket_ev.poll () & PE_W) 91 // write a nop to the socket at least every IDLE_NOP seconds.
92 if (!outputbuffer.len)
93 {
94 if (last_send + IDLE_PING <= NOW && pl && pl->active)
95 {
96 // this is a bit ugly, but map1/map1a seem to be the only
97 // nop'able commands and they are quite small.
98 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
99 send_packet (sl);
100 }
101 else
102 return;
103 }
104
105 if (socket_ev.poll () & PE_W)
87 return; 106 return;
88 107
108 last_send = NOW;
89 write_outputbuffer (); 109 write_outputbuffer ();
90} 110}
91 111
92void 112void
93client::write_outputbuffer () 113client::write_outputbuffer ()
… …
103 /* wrap back to start of buffer */ 123 /* wrap back to start of buffer */
104 if (outputbuffer.start == SOCKETBUFSIZE) 124 if (outputbuffer.start == SOCKETBUFSIZE)
105 outputbuffer.start = 0; 125 outputbuffer.start = 0;
106 126
107 outputbuffer.len -= res; 127 outputbuffer.len -= res;
108#ifdef CS_LOGSTATS
109 cst_tot.obytes += res;
110 cst_lst.obytes += res;
111#endif
112 } 128 }
113 else if (res == 0) 129 else if (res == 0)
114 { 130 {
115 LOG (llevError, "socket write failed, connection closed.\n"); 131 LOG (llevError, "socket write failed, connection closed.\n");
116 status = Ns_Dead; 132 destroy ();
117 return; 133 return;
118 } 134 }
119 else if (errno == EINTR) 135 else if (errno == EINTR)
120 { 136 {
121 // just retry 137 // just retry
… …
128 return; 144 return;
129 } 145 }
130 else 146 else
131 { 147 {
132 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 148 LOG (llevError, "socket write failed: %s\n", strerror (errno));
133 status = Ns_Dead; 149 destroy ();
134 return; 150 return;
135 } 151 }
136 } 152 }
137 153
138 socket_ev.poll (socket_ev.poll () & ~PE_W); 154 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} 155}
195 156
196/****************************************************************************** 157/******************************************************************************
197 * 158 *
198 * Start of read routines. 159 * Start of read routines.
199 * 160 *
200 ******************************************************************************/ 161 ******************************************************************************/
201 162
202int 163int
203client::read_packet () 164client::next_packet ()
204{ 165{
205 for (;;)
206 {
207 if (inbuf_len >= 2) 166 if (inbuf_len >= 2)
208 { 167 {
209 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 168 int pkt_len = (inbuf [0] << 8) | inbuf [1];
210 169
211 if (inbuf_len >= 2 + pkt_len) 170 if (inbuf_len >= 2 + pkt_len)
212 return pkt_len + 2; 171 return 2 + pkt_len;
172
173 if (inbuf_len == sizeof (inbuf))
213 } 174 {
175 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
176 destroy ();
177 return -1;
178 }
179 }
180
181 return 0;
182}
183
184void
185client::skip_packet (int len)
186{
187 inbuf_len -= len;
188 memmove (inbuf, inbuf + len, inbuf_len);
189}
190
191/*****************************************************************************
192 * Start of command dispatch area.
193 * The commands here are protocol commands.
194 ****************************************************************************/
195
196// SocketCommand, PlayingCommand, should not exist with those ugly casts
197#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
198#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
199
200/**
201 * Dispatch table for the server.
202 */
203static struct packet_type packets[] = {
204 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
205 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
206
207 {"examine", PC(ExamineCmd) PF_PLAYING },
208 {"ex", PC(ExCmd) PF_PLAYING },
209 {"apply", PC(ApplyCmd) PF_PLAYING },
210 {"lookat", PC(LookAt) PF_PLAYING },
211 {"lock", PC(LockItem) PF_PLAYING },
212 {"mark", PC(MarkItem) PF_PLAYING },
213 {"move", PC(MoveCmd) PF_PLAYING },
214 {"ext", PC(ExtCmd) 0 }, // CF+
215 {"mapredraw", PC(MapRedrawCmd) 0 },
216 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
217
218 {"reply", SC(ReplyCmd) 0 },
219 {"exti", SC(ExtiCmd) 0 }, // CF+
220 {"addme", SC(AddMeCmd) 0 },
221 {"askface", SC(AskFaceCmd) 0 },
222 {"requestinfo", SC(RequestInfo) 0 },
223 {"setfacemode", SC(SetFaceMode) 0 },
224 {"setsound", SC(SetSound) 0 },
225 {"setup", SC(SetUp) 0 },
226 {"version", SC(VersionCmd) 0 },
227 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
228 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
229 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
230};
231
232bool
233client::may_execute (const packet_type *pkt) const
234{
235 return (!(pkt->flags & PF_PLAYER) || pl)
236 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
237}
238
239// HACK: some commands currently should be executed
240// even when the player is frozen. this hack detects
241// those commands. it should be folded into may_execute,
242// but kept seperate to emphasise the hack aspect, i.e.
243// do it better, then remove.
244static bool
245always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
246{
247 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
248 return false;
249
250 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
251 return false;
252
253 if (pkt->flags & PF_COMMAND6)
254 {
255 data += 6;
256 len -= 6;
257 }
258
259 if (len > 4 && !strncmp (data, "say " , 4))
260 return true;
261 if (len > 5 && !strncmp (data, "chat ", 5))
262 return true;
263
264 return false;
265}
266
267void
268client::execute (const packet_type *pkt, char *data, int datalen)
269{
270 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
271 {
272 //TODO: only one format
273 if (pkt->flags & PF_PLAYER)
274 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
275 else
276 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
277 }
278 else
279 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
280}
281
282bool
283client::handle_packet ()
284{
285 int pkt_len = next_packet ();
286
287 if (!pkt_len)
288 return false;
289 else if (pkt_len < 0)
290 {
291 LOG (llevError, "read error on player %s\n",
292 pl && pl->ob ? &pl->ob->name : "[anonymous]");
293 destroy ();
294 return false;
295 }
296
297 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
298
299 /* First, break out beginning word. There are at least
300 * a few commands that do not have any paremeters. If
301 * we get such a command, don't worry about trying
302 * to break it up.
303 */
304 int datalen;
305 char *data = strchr ((char *)inbuf + 2, ' ');
306
307 if (data)
308 {
309 *data++ = 0;
310 datalen = pkt_len - (data - (char *)inbuf);
311 }
312 else
313 {
314 data = (char *)inbuf + 2; // better read garbage than segfault
315 datalen = 0;
316 }
317
318 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
319 if (!strcmp ((char *)inbuf + 2, pkt->name))
320 {
321 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
322 queue_command (pkt, data, datalen);
323 else
324 execute (pkt, data, datalen);
325
326 goto next_packet;
327 }
328
329 // If we get here, we didn't find a valid command.
330 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
331next_packet:
332 skip_packet (pkt_len);
333
334 // input buffer has space again
335 socket_ev.poll (socket_ev.poll () | PE_R);
336
337 return true;
338}
339
340// callback called when socket is either readable or writable
341void
342client::socket_cb (iow &w, int got)
343{
344 //TODO remove when we have better socket cleanup logic
345 if (destroyed ())
346 {
347 socket_ev.poll (0);
348 return;
349 }
350
351 if (got & PE_W)
352 {
353 write_outputbuffer ();
354
355 if (!outputbuffer.len)
356 socket_ev.poll (socket_ev.poll () & ~PE_W);
357 }
358
359 if (got & PE_R)
360 {
361 //TODO: rate-limit tcp connection in better ways, important
214 362
215 int amount = sizeof (inbuf) - inbuf_len; 363 int amount = sizeof (inbuf) - inbuf_len;
216 364
217 if (amount <= 0) 365 if (!amount)
218 { 366 {
219 LOG (llevError, "packet too large");//TODO 367 // input buffer full
368 socket_ev.poll (socket_ev.poll () & ~PE_R);
220 return -1; 369 return;
221 } 370 }
222 371
223 amount = read (fd, inbuf + inbuf_len, amount); 372 amount = read (fd, inbuf + inbuf_len, amount);
224 373
225 if (!amount) 374 if (!amount)
226 { 375 {
227 status = Ns_Dead; 376 destroy ();
228 return -1; 377 return;
229 } 378 }
230 else if (amount < 0) 379 else if (amount < 0)
231 { 380 {
232 if (errno != EAGAIN && errno != EINTR) 381 if (errno != EAGAIN && errno != EINTR)
233 { 382 {
234 LOG (llevError, "read error: %s\n", strerror (errno)); 383 LOG (llevError, "read error: %s\n", strerror (errno));
384 destroy ();
235 return -1; 385 return;
236 } 386 }
237 387
238 return 0; 388 // should not be here, normally
389 }
390 else
239 } 391 {
240
241 inbuf_len += amount; 392 inbuf_len += amount;
242 393
243 cst_tot.ibytes += amount; 394 cmd_ev.start ();
244 cst_lst.ibytes += amount; 395 }
245 } 396 }
246} 397}
247 398
399// called whenever we have additional commands to process
248void 400void
249client::skip_packet (int len) 401client::cmd_cb (iw &w)
250{ 402{
251 inbuf_len -= len; 403 if (handle_packet ())
252 memmove (inbuf, inbuf + len, inbuf_len); 404 w.start ();
405 else
406 flush ();
253} 407}
254 408
255/******************************************************************************* 409/*******************************************************************************
256 * 410 *
257 * Start of write related routines. 411 * Start of write related routines.
… …
266 */ 420 */
267void 421void
268client::send (void *buf_, int len) 422client::send (void *buf_, int len)
269{ 423{
270 char *buf = (char *)buf_; 424 char *buf = (char *)buf_;
271 char *pos = buf;
272 int amt = 0;
273 425
274 if (status == Ns_Dead || !buf) 426 if (destroyed () || !buf)
275 {
276 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
277 return; 427 return;
278 }
279 428
280 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 429 if (len + outputbuffer.len > SOCKETBUFSIZE)
281 { 430 {
282 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 431 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
283 status = Ns_Dead; 432 // shutdown the socket, this is safer than destroying it immediately
433 // as lots of code in the callchain might still access the map etc.
434 shutdown (fd, SHUT_RDWR);
284 return; 435 return;
285 } 436 }
286 437
287 int avail, end; 438 int avail, end;
288 439
… …
306 } 457 }
307 458
308 outputbuffer.len += len; 459 outputbuffer.len += len;
309} 460}
310 461
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/** 462/**
321 * Takes a string of data, and writes it out to the socket. A very handy 463 * Takes a string of data, and writes it out to the socket. A very handy
322 * shortcut function. 464 * shortcut function.
323 */ 465 */
324void 466void
325client::send_packet (packet &sl) 467client::send_packet (packet &sl)
326{ 468{
327 if (status == Ns_Dead) 469 if (destroyed ())
328 return; 470 return;
329 471
330 if (sl.length () >= MAXSOCKBUF) 472 if (sl.length () > MAXSOCKBUF)
331 { 473 {
332 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 474 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
333 /* Almost certainly we've overflowed a buffer, so quit now to make 475 /* Almost certainly we've overflowed a buffer, so quit now to make
334 * it easier to debug. 476 * it easier to debug.
335 */ 477 */
… …
360client::send_packet (const char *buf) 502client::send_packet (const char *buf)
361{ 503{
362 send_packet (buf, strlen (buf)); 504 send_packet (buf, strlen (buf));
363} 505}
364 506
507void
508client::send_packet_printf (const char *format, ...)
509{
510 packet sl;
511
512 va_list ap;
513 va_start (ap, format);
514 sl.vprintf (format, ap);
515 va_end (ap);
516
517 send_packet (sl);
518}
519
520// returns true when the message needs special (read: perl) treatment
521static bool
522msg_is_special (const char *msg)
523{
524 return msg [strcspn (msg, "<[&\n")];
525}
526
527void
528client::send_msg (int color, const char *type, const char *msg)
529{
530 if (msg_is_special (msg))
531 cfperl_send_msg (this, color, type, msg);
532 else if (can_msg)
533 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
534 else if (color < 0)
535 return; // client cannot handle this
536 else
537 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
538}
539
540void
541client::send_drawinfo (const char *msg, int flags)
542{
543 send_msg (flags, "log", msg);
544}
545
365/****************************************************************************** 546/***********************************************************************
366 * 547 *
367 * statistics logging functions. 548 * packet functions/utilities
368 * 549 *
369 ******************************************************************************/ 550 **********************************************************************/
370 551
371#ifdef CS_LOGSTATS 552packet::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{ 553{
384 time_t now = time (NULL); 554 reset ();
385 555
386 /* If no connections recently, don't both to log anything */ 556 int len = strlen (name);
387 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 557 memcpy (cur, name, len); cur += len;
388 return; 558 *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} 559}
398#endif
399 560
561packet &packet::operator <<(const ber32 v)
562{
563 enum { maxlen = 32 / 7 + 1};
564 uint8 buf[maxlen];
565 uint8 *p = buf + maxlen;
566 uint32 val = v.val;
567
568 *--p = val & 0x7F;
569
570 while (val > 0x7F)
571 {
572 val >>= 7;
573 *--p = (val & 0x7F) | 0x80;
574 }
575
576 return *this << data (p, buf + maxlen - p);
577}
578
579packet &packet::operator <<(const data &v)
580{
581 if (room () < v.len)
582 reset ();
583 else
584 {
585 if (v.len)
586 {
587 memcpy (cur, v.ptr, v.len);
588 cur += v.len;
589 }
590 }
591
592 return *this;
593}
594
595packet &packet::operator <<(const data8 &v)
596{
597 unsigned int len = min (v.len, 0x00FF);
598 return *this << uint8 (len) << data (v.ptr, len);
599}
600
601packet &packet::operator <<(const data16 &v)
602{
603 unsigned int len = min (v.len, 0xFFFF);
604 return *this << uint16 (len) << data (v.ptr, len);
605}
606
607packet &packet::operator <<(const char *v)
608{
609 return *this << data (v, strlen (v ? v : 0));
610}
611
612void
613packet::vprintf (const char *format, va_list ap)
614{
615 int size = room ();
616
617 int len = vsnprintf ((char *)cur, size, format, ap);
618
619 if (len >= size)
620 return reset ();
621
622 cur += len;
623}
624

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