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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.14 by root, Thu Dec 14 01:21:58 2006 UTC vs.
Revision 1.44 by root, Sat Jun 9 22:54:28 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 *
20 The author can be reached via e-mail to mark@pyramid.com 21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
21*/ 22 */
22 23
23/** 24/**
24 * \file 25 * \file
25 * Low-level socket-related functions. 26 * Low-level socket-related functions.
26 * 27 *
… …
33 */ 34 */
34 35
35using namespace std; 36using namespace std;
36 37
37#include <global.h> 38#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg> 40#include <cstdarg>
41 41
42#ifdef __linux__ 42#ifdef __linux__
43# include <sys/types.h> 43# include <sys/types.h>
44# include <sys/socket.h> 44# include <sys/socket.h>
45# include <netinet/in.h> 45# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 46# include <netinet/tcp.h>
48#endif 47#endif
49 48
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 49// disconnect a socket after this many seconds without an ack
51// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 50#define SOCKET_TIMEOUT 8.
53#define SOCKET_TIMEOUT2 20
54 51
52// force a packet when idle for more than this many seconds,
53// forcing an ack regularly.
54#define IDLE_PING 2.
55
55void 56void
56Socket_Flush (NewSocket * ns) 57client::flush ()
57{ 58{
58#ifdef __linux__ 59 if (destroyed ())
60 return;
61
62#ifdef __linux__ //TODO: this is available on bsds, too, use a configure test.
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
59 // check time of last ack, and, if too old, kill connection 66 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 67 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 68 socklen_t len = sizeof (tcpi);
62 69
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 70 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 71 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 72 rtt = tcpi.tcpi_rtt;
73 rttvar = tcpi.tcpi_rttvar;
66 74
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 75 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 { 76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 80 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); 81 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
72 ns->status = Ns_Dead; 82 destroy ();
73 } 83 }
84 }
74 } 85 }
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 86#endif
81}
82 87
83/*********************************************************************** 88 /**
84 * 89 * Writes data to socket.
85 * packet functions/utilities 90 *
86 * 91 * When the socket is clear to write, and we have backlogged data, this
87 **********************************************************************/ 92 * is called to write it out.
93 */
88 94
89packet &packet::operator <<(const data &v) 95 // write a nop to the socket at least every IDLE_NOP seconds.
90{ 96 if (!outputbuffer.len)
91 if (v.len)
92 {
93 memcpy (buf + len, v.ptr, v.len);
94 len += v.len;
95 } 97 {
98 if (last_send + IDLE_PING <= NOW)
99 {
100 // this is a bit ugly, but map1/map1a seem to be the only
101 // nop'able commands and they are quite small.
102 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
103 send_packet (sl);
104 }
105 else
106 return;
107 }
96 108
97 return *this; 109 if (socket_ev.poll () & PE_W)
98} 110 return;
99 111
100packet &packet::operator <<(const data8 &v) 112 last_send = NOW;
101{ 113 write_outputbuffer ();
102 unsigned int len = min (v.len, 0x00FF);
103 return *this << uint8 (len) << data (v.ptr, len);
104} 114}
105 115
106packet &packet::operator <<(const data16 &v)
107{
108 unsigned int len = min (v.len, 0xFFFF);
109 return *this << uint16 (len) << data (v.ptr, len);
110}
111
112packet &packet::operator <<(const char *v)
113{
114 return *this << data (v, strlen (v ? v : 0));
115}
116
117void 116void
118packet::printf (const char *format, ...) 117client::write_outputbuffer ()
119{ 118{
120 va_list ap; 119 while (outputbuffer.len)
121 va_start (ap, format); 120 {
121 int res = write (fd, outputbuffer.data + outputbuffer.start,
122 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
122 123
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); 124 if (res > 0)
125 {
126 outputbuffer.start += res;
127 /* wrap back to start of buffer */
128 if (outputbuffer.start == SOCKETBUFSIZE)
129 outputbuffer.start = 0;
124 130
125 va_end (ap); 131 outputbuffer.len -= res;
132 }
133 else if (res == 0)
134 {
135 LOG (llevError, "socket write failed, connection closed.\n");
136 destroy ();
137 return;
138 }
139 else if (errno == EINTR)
140 {
141 // just retry
142 }
143 else if (errno == EAGAIN)
144 {
145 // delay till ready
146 socket_ev.poll (socket_ev.poll () | PE_W);
147 socket_ev.start ();
148 return;
149 }
150 else
151 {
152 LOG (llevError, "socket write failed: %s\n", strerror (errno));
153 destroy ();
154 return;
155 }
156 }
157
158 socket_ev.poll (socket_ev.poll () & ~PE_W);
126} 159}
127 160
128/****************************************************************************** 161/******************************************************************************
129 * 162 *
130 * Start of read routines. 163 * Start of read routines.
131 * 164 *
132 ******************************************************************************/ 165 ******************************************************************************/
133 166
134int 167int
135NewSocket::read_packet () 168client::next_packet ()
136{ 169{
137 for (;;)
138 {
139 if (inbuf_len >= 2) 170 if (inbuf_len >= 2)
140 { 171 {
141 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 172 int pkt_len = (inbuf [0] << 8) | inbuf [1];
142 173
143 if (inbuf_len >= 2 + pkt_len) 174 if (inbuf_len >= 2 + pkt_len)
144 return pkt_len + 2; 175 return 2 + pkt_len;
176
177 if (inbuf_len == sizeof (inbuf))
145 } 178 {
179 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
180 destroy ();
181 return -1;
182 }
183 }
184
185 return 0;
186}
187
188void
189client::skip_packet (int len)
190{
191 inbuf_len -= len;
192 memmove (inbuf, inbuf + len, inbuf_len);
193}
194
195/*****************************************************************************
196 * Start of command dispatch area.
197 * The commands here are protocol commands.
198 ****************************************************************************/
199
200// SocketCommand, PlayingCommand, should not exist with those ugly casts
201#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
202#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
203
204/**
205 * Dispatch table for the server.
206 */
207static struct packet_type packets[] = {
208 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
209 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
210
211 {"examine", PC(ExamineCmd) PF_PLAYING },
212 {"ex", PC(ExCmd) PF_PLAYING },
213 {"apply", PC(ApplyCmd) PF_PLAYING },
214 {"lookat", PC(LookAt) PF_PLAYING },
215 {"lock", PC(LockItem) PF_PLAYING },
216 {"mark", PC(MarkItem) PF_PLAYING },
217 {"move", PC(MoveCmd) PF_PLAYING },
218 {"ext", PC(ExtCmd) 0 }, // CF+
219 {"mapredraw", PC(MapRedrawCmd) 0 },
220 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
221
222 {"reply", SC(ReplyCmd) 0 },
223 {"exti", SC(ExtiCmd) 0 }, // CF+
224 {"addme", SC(AddMeCmd) 0 },
225 {"askface", SC(AskFaceCmd) 0 },
226 {"requestinfo", SC(RequestInfo) 0 },
227 {"setfacemode", SC(SetFaceMode) 0 },
228 {"setsound", SC(SetSound) 0 },
229 {"setup", SC(SetUp) 0 },
230 {"version", SC(VersionCmd) 0 },
231 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
232 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
233 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
234};
235
236bool
237client::may_execute (const packet_type *pkt) const
238{
239 return (!(pkt->flags & PF_PLAYER) || pl)
240 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
241}
242
243// HACK: some commands currently should be executed
244// even when the player is frozen. this hack detects
245// those commands. it should be folded into may_execute,
246// but kept seperate to emphasise the hack aspect, i.e.
247// do it better, then remove.
248static bool
249always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
250{
251 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
252 return false;
253
254 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
255 return false;
256
257 if (pkt->flags & PF_COMMAND6)
258 {
259 data += 6;
260 len -= 6;
261 }
262
263 if (len > 4 && !strncmp (data, "say " , 4))
264 return true;
265 if (len > 5 && !strncmp (data, "chat ", 5))
266 return true;
267
268 return false;
269}
270
271void
272client::execute (const packet_type *pkt, char *data, int datalen)
273{
274 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
275 {
276 //TODO: only one format
277 if (pkt->flags & PF_PLAYER)
278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
279 else
280 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
281 }
282 else
283 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
284}
285
286bool
287client::handle_packet ()
288{
289 int pkt_len = next_packet ();
290
291 if (!pkt_len)
292 return false;
293 else if (pkt_len < 0)
294 {
295 LOG (llevError, "read error on player %s\n",
296 pl && pl->ob ? &pl->ob->name : "[anonymous]");
297 destroy ();
298 return false;
299 }
300
301 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
302
303 /* First, break out beginning word. There are at least
304 * a few commands that do not have any paremeters. If
305 * we get such a command, don't worry about trying
306 * to break it up.
307 */
308 int datalen;
309 char *data = strchr ((char *)inbuf + 2, ' ');
310
311 if (data)
312 {
313 *data++ = 0;
314 datalen = pkt_len - (data - (char *)inbuf);
315 }
316 else
317 {
318 data = (char *)inbuf + 2; // better read garbage than segfault
319 datalen = 0;
320 }
321
322 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
323 if (!strcmp ((char *)inbuf + 2, pkt->name))
324 {
325 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
326 queue_command (pkt, data, datalen);
327 else
328 execute (pkt, data, datalen);
329
330 goto next_packet;
331 }
332
333 // If we get here, we didn't find a valid command.
334 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
335next_packet:
336 skip_packet (pkt_len);
337
338 // input buffer has space again
339 socket_ev.poll (socket_ev.poll () | PE_R);
340
341 return true;
342}
343
344// callback called when socket is either readable or writable
345void
346client::socket_cb (iow &w, int got)
347{
348 //TODO remove when we have better socket cleanup logic
349 if (destroyed ())
350 {
351 socket_ev.poll (0);
352 return;
353 }
354
355 if (got & PE_W)
356 {
357 write_outputbuffer ();
358
359 if (!outputbuffer.len)
360 socket_ev.poll (socket_ev.poll () & ~PE_W);
361 }
362
363 if (got & PE_R)
364 {
365 //TODO: rate-limit tcp connection in better ways, important
146 366
147 int amount = sizeof (inbuf) - inbuf_len; 367 int amount = sizeof (inbuf) - inbuf_len;
148 368
149 if (amount <= 0) 369 if (!amount)
150 { 370 {
151 LOG (llevError, "packet too large");//TODO 371 // input buffer full
372 socket_ev.poll (socket_ev.poll () & ~PE_R);
152 return -1; 373 return;
153 } 374 }
154 375
155 amount = read (fd, inbuf + inbuf_len, amount); 376 amount = read (fd, inbuf + inbuf_len, amount);
156 377
157 if (!amount) 378 if (!amount)
158 { 379 {
159 status = Ns_Dead; 380 destroy ();
160 return -1; 381 return;
161 } 382 }
162 else if (amount < 0) 383 else if (amount < 0)
163 { 384 {
164 if (errno != EAGAIN && errno != EINTR) 385 if (errno != EAGAIN && errno != EINTR)
165 { 386 {
166 LOG (llevError, "read error: %s", strerror (errno)); 387 LOG (llevError, "read error: %s\n", strerror (errno));
388 destroy ();
167 return -1; 389 return;
168 } 390 }
169 391
170 return 0; 392 // should not be here, normally
393 }
394 else
171 } 395 {
172
173 inbuf_len += amount; 396 inbuf_len += amount;
174 397
175 cst_tot.ibytes += amount; 398 cmd_ev.start ();
176 cst_lst.ibytes += amount; 399 }
177 } 400 }
178} 401}
179 402
403// called whenever we have additional commands to process
180void 404void
181NewSocket::skip_packet (int len) 405client::cmd_cb (iw &w)
182{ 406{
183 inbuf_len -= len; 407 if (handle_packet ())
184 memmove (inbuf, inbuf + len, inbuf_len); 408 w.start ();
409 else
410 flush ();
185} 411}
186 412
187/******************************************************************************* 413/*******************************************************************************
188 * 414 *
189 * Start of write related routines. 415 * Start of write related routines.
… …
194 * Adds data to a socket buffer for whatever reason. 420 * Adds data to a socket buffer for whatever reason.
195 * 421 *
196 * ns is the socket we are adding the data to, buf is the start of the 422 * ns is the socket we are adding the data to, buf is the start of the
197 * data, and len is the number of bytes to add. 423 * data, and len is the number of bytes to add.
198 */ 424 */
199 425void
200static void 426client::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 427{
428 char *buf = (char *)buf_;
429
430 if (destroyed () || !buf)
431 return;
432
433 if (len + outputbuffer.len > SOCKETBUFSIZE)
434 {
435 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
436 // shutdown the socket, this is safer than destroying it immediately
437 // as lots of code in the callchain might still access the map etc.
438 shutdown (fd, SHUT_RDWR);
439 return;
440 }
441
203 int avail, end; 442 int avail, end;
204
205 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
206 {
207 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
208 ns->status = Ns_Dead;
209 return;
210 }
211 443
212 /* data + end is where we start putting the new data. The last byte 444 /* data + end is where we start putting the new data. The last byte
213 * currently in use is actually data + end -1 445 * currently in use is actually data + end -1
214 */ 446 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 447 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 448 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 449 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 450 end -= SOCKETBUFSIZE;
220 451
221 avail = SOCKETBUFSIZE - end; 452 avail = SOCKETBUFSIZE - end;
222 453
223 /* We can all fit it behind the current data without wrapping */ 454 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 455 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 456 memcpy (outputbuffer.data + end, buf, len);
226 else 457 else
227 { 458 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 459 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 460 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 461 }
231 462
232 ns->outputbuffer.len += len; 463 outputbuffer.len += len;
233#if 0
234 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
235#endif
236}
237
238/**
239 * Writes data to socket.
240 *
241 * When the socket is clear to write, and we have backlogged data, this
242 * is called to write it out.
243 */
244void
245write_socket_buffer (NewSocket * ns)
246{
247 int amt, max;
248
249 if (ns->outputbuffer.len == 0)
250 {
251 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
252 return;
253 }
254
255 do
256 {
257 max = SOCKETBUFSIZE - ns->outputbuffer.start;
258 if (ns->outputbuffer.len < max)
259 max = ns->outputbuffer.len;
260
261 do
262 {
263 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
264 }
265 while ((amt < 0) && (errno == EINTR));
266
267 if (amt < 0)
268 { /* We got an error */
269
270 if (errno != EWOULDBLOCK)
271 {
272 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
273 ns->status = Ns_Dead;
274 return;
275 }
276 else
277 { /* EWOULDBLOCK */
278 /* can't write it, so store it away. */
279 ns->can_write = 0;
280 return;
281 }
282 }
283 ns->outputbuffer.start += amt;
284 /* wrap back to start of buffer */
285 if (ns->outputbuffer.start == SOCKETBUFSIZE)
286 ns->outputbuffer.start = 0;
287 ns->outputbuffer.len -= amt;
288#ifdef CS_LOGSTATS
289 cst_tot.obytes += amt;
290 cst_lst.obytes += amt;
291#endif
292 }
293 while (ns->outputbuffer.len > 0);
294}
295
296/**
297 * This writes data to the socket. - It is very low level -
298 * all we try and do is write out the data to the socket
299 * provided (ns). buf is the data to write, len is the number
300 * of bytes to write. IT doesn't return anything - rather, it
301 * updates the ns structure if we get an error.
302 */
303void
304Write_To_Socket (NewSocket * ns, char *buf, int len)
305{
306 int amt = 0;
307 char *pos = buf;
308
309 if (ns->status == Ns_Dead || !buf)
310 {
311 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
312 return;
313 }
314
315#ifndef __GNU__ /* This caused problems on Hurd */
316 if (!ns->can_write)
317 {
318 add_to_buffer (ns, buf, len);
319 return;
320 }
321#endif
322 /* If we manage to write more than we wanted, take it as a bonus */
323 while (len > 0)
324 {
325
326 do
327 {
328 amt = write (ns->fd, pos, len);
329 }
330 while ((amt < 0) && (errno == EINTR));
331
332 if (amt < 0)
333 { /* We got an error */
334 if (errno != EWOULDBLOCK)
335 {
336 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
337 errno, strerror (errno));
338 ns->status = Ns_Dead;
339 return;
340 }
341 else
342 { /* EWOULDBLOCK */
343 /* can't write it, so store it away. */
344 add_to_buffer (ns, pos, len);
345 ns->can_write = 0;
346 return;
347 }
348 }
349 /* amt gets set to 0 above in blocking code, so we do this as
350 * an else if to make sure we don't reprocess it.
351 */
352 else if (amt == 0)
353 {
354 LOG (llevError, "Write_To_Socket: No data written out.\n");
355 }
356 len -= amt;
357 pos += amt;
358#ifdef CS_LOGSTATS
359 cst_tot.obytes += amt;
360 cst_lst.obytes += amt;
361#endif
362 }
363} 464}
364 465
365/** 466/**
366 * Takes a string of data, and writes it out to the socket. A very handy 467 * Takes a string of data, and writes it out to the socket. A very handy
367 * shortcut function. 468 * shortcut function.
368 */ 469 */
369
370void 470void
371NewSocket::send_packet (packet &sl) 471client::send_packet (packet &sl)
372{ 472{
373 Send_With_Handling (this, &sl); 473 if (destroyed ())
374}
375
376void
377NewSocket::send_packet (const char *buf, int len)
378{
379 packet sl;
380
381 sl << data (buf, len);
382 send_packet (sl);
383}
384
385void
386NewSocket::send_packet (const char *buf)
387{
388 send_packet (buf, strlen (buf));
389}
390
391/**
392 * Calls Write_To_Socket to send data to the client.
393 *
394 * The only difference in this function is that we take a packet
395 *, and we prepend the length information.
396 */
397void
398Send_With_Handling (NewSocket *ns, packet *msg)
399{
400 unsigned char sbuf[4];
401
402 if (ns->status == Ns_Dead || !msg)
403 return; 474 return;
404 475
405 if (msg->len >= MAXSOCKBUF) 476 if (sl.length () >= MAXSOCKBUF)
406 { 477 {
407 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
408 /* Almost certainly we've overflowed a buffer, so quite now to make 479 /* Almost certainly we've overflowed a buffer, so quit now to make
409 * it easier to debug. 480 * it easier to debug.
410 */ 481 */
411 abort (); 482 abort ();
412 } 483 }
413 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
414 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
415 if (ns->status != Ns_Old)
416 Write_To_Socket (ns, (char *) sbuf, 2);
417 Write_To_Socket (ns, (char *) msg->buf, msg->len);
418}
419 484
420/****************************************************************************** 485 if (!sl.length ())
421 *
422 * statistics logging functions.
423 *
424 ******************************************************************************/
425
426#ifdef CS_LOGSTATS
427
428/* cst_tot is for the life of the server, cst_last is for the last series of
429 * stats
430 */
431CS_Stats cst_tot, cst_lst;
432
433/**
434 * Writes out the gathered stats. We clear cst_lst.
435 */
436void
437write_cs_stats (void)
438{
439 time_t now = time (NULL);
440
441 /* If no connections recently, don't both to log anything */
442 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
443 return; 486 return;
444 487
445 /* CSSTAT is put in so scripts can easily find the line */ 488 assert (sl.hdrlen == 2);
446 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
447 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
448 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
449 cst_lst.ibytes = 0;
450 cst_lst.obytes = 0;
451 cst_lst.max_conn = socket_info.nconns;
452 cst_lst.time_start = now;
453}
454#endif
455 489
490 sl.buf_ [0] = sl.length () >> 8;
491 sl.buf_ [1] = sl.length () ;
492
493 send (sl.buf_, sl.length () + sl.hdrlen);
494}
495
496void
497client::send_packet (const char *buf, int len)
498{
499 packet sl;
500
501 sl << data (buf, len);
502 send_packet (sl);
503}
504
505void
506client::send_packet (const char *buf)
507{
508 send_packet (buf, strlen (buf));
509}
510
511void
512client::send_packet_printf (const char *format, ...)
513{
514 packet sl;
515
516 va_list ap;
517 va_start (ap, format);
518 sl.vprintf (format, ap);
519 va_end (ap);
520
521 send_packet (sl);
522}
523
524void
525client::send_drawinfo (const char *msg, int flags)
526{
527 send_packet_printf ("drawinfo %d %s", flags, msg);
528}
529
530void
531client::send_msg (int color, const char *type, const char *msg)
532{
533 if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg);
535 else if (color < 0)
536 return; // client cannot handle this
537 else if (strchr (msg, '<') || strchr (msg, '&'))
538 {
539 //TODO: should escape/modify to old syntax
540 send_packet_printf ("drawinfo %d %s", color, msg);
541 }
542 else
543 send_packet_printf ("drawinfo %d %s", color, msg);
544}
545
546/***********************************************************************
547 *
548 * packet functions/utilities
549 *
550 **********************************************************************/
551
552packet::packet (const char *name)
553{
554 reset ();
555
556 int len = strlen (name);
557 memcpy (cur, name, len); cur += len;
558 *cur++ = ' ';
559}
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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