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Revision 1.18 by root, Thu Dec 14 05:09:32 2006 UTC vs.
Revision 1.48 by root, Sun Jun 24 04:09:29 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 <newclient.h>
39#include <sproto.h> 27#include <sproto.h>
40#include <cstdarg> 28#include <cstdarg>
41 29
42#ifdef __linux__ 30#if HAVE_TCP_INFO
43# include <sys/types.h> 31# include <sys/types.h>
44# include <sys/socket.h> 32# include <sys/socket.h>
45# include <netinet/in.h> 33# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 34# include <netinet/tcp.h>
48#endif 35#endif
49 36
50// 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
51// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 38#define SOCKET_TIMEOUT 8.
53#define SOCKET_TIMEOUT2 20
54 39
40// force a packet when idle for more than this many seconds,
41// forcing an ack regularly.
42#define IDLE_PING 2.
43
55void 44void
56Socket_Flush (client_socket * ns) 45client::flush ()
57{ 46{
58#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 // do this only when player is active
53 if (!((pticks + fd) & 7) && pl && pl->active)
54 {
59 // check time of last ack, and, if too old, kill connection 55 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 56 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 57 socklen_t len = sizeof (tcpi);
62 58
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 59 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 60 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 61 if (tcpi.tcpi_snd_mss)
62 mss = tcpi.tcpi_snd_mss;
66 63
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 64 rtt = tcpi.tcpi_rtt;
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 65 rttvar = tcpi.tcpi_rttvar;
66
67 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
69 { 68 {
69 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
70 write_outputbuffer ();
71
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 72 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); 73 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
72 ns->status = Ns_Dead; 74 destroy ();
73 } 75 }
76 }
74 } 77 }
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 78#endif
81}
82 79
83/*********************************************************************** 80 /**
84 * 81 * Writes data to socket.
85 * packet functions/utilities 82 *
86 * 83 * When the socket is clear to write, and we have backlogged data, this
87 **********************************************************************/ 84 * is called to write it out.
85 */
88 86
89packet &packet::operator <<(const data &v) 87 // write a nop to the socket at least every IDLE_NOP seconds.
90{ 88 if (!outputbuffer.len)
91 if (room () < v.len)
92 reset ();
93 else
94 { 89 {
95 if (v.len) 90 if (last_send + IDLE_PING <= NOW && pl && pl->active)
96 {
97 memcpy (cur, v.ptr, v.len);
98 cur += v.len;
99 } 91 {
92 // this is a bit ugly, but map1/map1a seem to be the only
93 // nop'able commands and they are quite small.
94 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
95 send_packet (sl);
96 }
97 else
98 return;
99 }
100
101 if (socket_ev.poll () & PE_W)
102 return;
103
104 last_send = NOW;
105 write_outputbuffer ();
106}
107
108void
109client::write_outputbuffer ()
110{
111 while (outputbuffer.len)
100 } 112 {
113 int res = write (fd, outputbuffer.data + outputbuffer.start,
114 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
101 115
102 return *this; 116 if (res > 0)
103} 117 {
118 outputbuffer.start += res;
119 /* wrap back to start of buffer */
120 if (outputbuffer.start == SOCKETBUFSIZE)
121 outputbuffer.start = 0;
104 122
105packet &packet::operator <<(const data8 &v) 123 outputbuffer.len -= res;
106{ 124 }
107 unsigned int len = min (v.len, 0x00FF); 125 else if (res == 0)
108 return *this << uint8 (len) << data (v.ptr, len); 126 {
109} 127 LOG (llevError, "socket write failed, connection closed.\n");
128 destroy ();
129 return;
130 }
131 else if (errno == EINTR)
132 {
133 // just retry
134 }
135 else if (errno == EAGAIN)
136 {
137 // delay till ready
138 socket_ev.poll (socket_ev.poll () | PE_W);
139 socket_ev.start ();
140 return;
141 }
142 else
143 {
144 LOG (llevError, "socket write failed: %s\n", strerror (errno));
145 destroy ();
146 return;
147 }
148 }
110 149
111packet &packet::operator <<(const data16 &v) 150 socket_ev.poll (socket_ev.poll () & ~PE_W);
112{
113 unsigned int len = min (v.len, 0xFFFF);
114 return *this << uint16 (len) << data (v.ptr, len);
115}
116
117packet &packet::operator <<(const char *v)
118{
119 return *this << data (v, strlen (v ? v : 0));
120}
121
122void
123packet::printf (const char *format, ...)
124{
125 int size = room ();
126
127 va_list ap;
128 va_start (ap, format);
129 int len = vsnprintf ((char *)cur, size, format, ap);
130 va_end (ap);
131
132 if (len >= size)
133 return reset ();
134
135 cur += len;
136} 151}
137 152
138/****************************************************************************** 153/******************************************************************************
139 * 154 *
140 * Start of read routines. 155 * Start of read routines.
141 * 156 *
142 ******************************************************************************/ 157 ******************************************************************************/
143 158
144int 159int
145client_socket::read_packet () 160client::next_packet ()
146{ 161{
147 for (;;)
148 {
149 if (inbuf_len >= 2) 162 if (inbuf_len >= 2)
150 { 163 {
151 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 164 int pkt_len = (inbuf [0] << 8) | inbuf [1];
152 165
153 if (inbuf_len >= 2 + pkt_len) 166 if (inbuf_len >= 2 + pkt_len)
154 return pkt_len + 2; 167 return 2 + pkt_len;
168
169 if (inbuf_len == sizeof (inbuf))
155 } 170 {
171 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
172 destroy ();
173 return -1;
174 }
175 }
176
177 return 0;
178}
179
180void
181client::skip_packet (int len)
182{
183 inbuf_len -= len;
184 memmove (inbuf, inbuf + len, inbuf_len);
185}
186
187/*****************************************************************************
188 * Start of command dispatch area.
189 * The commands here are protocol commands.
190 ****************************************************************************/
191
192// SocketCommand, PlayingCommand, should not exist with those ugly casts
193#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
194#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
195
196/**
197 * Dispatch table for the server.
198 */
199static struct packet_type packets[] = {
200 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
201 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
202
203 {"examine", PC(ExamineCmd) PF_PLAYING },
204 {"ex", PC(ExCmd) PF_PLAYING },
205 {"apply", PC(ApplyCmd) PF_PLAYING },
206 {"lookat", PC(LookAt) PF_PLAYING },
207 {"lock", PC(LockItem) PF_PLAYING },
208 {"mark", PC(MarkItem) PF_PLAYING },
209 {"move", PC(MoveCmd) PF_PLAYING },
210 {"ext", PC(ExtCmd) 0 }, // CF+
211 {"mapredraw", PC(MapRedrawCmd) 0 },
212 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
213
214 {"reply", SC(ReplyCmd) 0 },
215 {"exti", SC(ExtiCmd) 0 }, // CF+
216 {"addme", SC(AddMeCmd) 0 },
217 {"askface", SC(AskFaceCmd) 0 },
218 {"requestinfo", SC(RequestInfo) 0 },
219 {"setfacemode", SC(SetFaceMode) 0 },
220 {"setsound", SC(SetSound) 0 },
221 {"setup", SC(SetUp) 0 },
222 {"version", SC(VersionCmd) 0 },
223 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
224 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
225 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
226};
227
228bool
229client::may_execute (const packet_type *pkt) const
230{
231 return (!(pkt->flags & PF_PLAYER) || pl)
232 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
233}
234
235// HACK: some commands currently should be executed
236// even when the player is frozen. this hack detects
237// those commands. it should be folded into may_execute,
238// but kept seperate to emphasise the hack aspect, i.e.
239// do it better, then remove.
240static bool
241always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
242{
243 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
244 return false;
245
246 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
247 return false;
248
249 if (pkt->flags & PF_COMMAND6)
250 {
251 data += 6;
252 len -= 6;
253 }
254
255 if (len > 4 && !strncmp (data, "say " , 4))
256 return true;
257 if (len > 5 && !strncmp (data, "chat ", 5))
258 return true;
259
260 return false;
261}
262
263void
264client::execute (const packet_type *pkt, char *data, int datalen)
265{
266 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
267 {
268 //TODO: only one format
269 if (pkt->flags & PF_PLAYER)
270 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
271 else
272 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
273 }
274 else
275 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
276}
277
278bool
279client::handle_packet ()
280{
281 int pkt_len = next_packet ();
282
283 if (!pkt_len)
284 return false;
285 else if (pkt_len < 0)
286 {
287 LOG (llevError, "read error on player %s\n",
288 pl && pl->ob ? &pl->ob->name : "[anonymous]");
289 destroy ();
290 return false;
291 }
292
293 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
294
295 /* First, break out beginning word. There are at least
296 * a few commands that do not have any paremeters. If
297 * we get such a command, don't worry about trying
298 * to break it up.
299 */
300 int datalen;
301 char *data = strchr ((char *)inbuf + 2, ' ');
302
303 if (data)
304 {
305 *data++ = 0;
306 datalen = pkt_len - (data - (char *)inbuf);
307 }
308 else
309 {
310 data = (char *)inbuf + 2; // better read garbage than segfault
311 datalen = 0;
312 }
313
314 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
315 if (!strcmp ((char *)inbuf + 2, pkt->name))
316 {
317 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
318 queue_command (pkt, data, datalen);
319 else
320 execute (pkt, data, datalen);
321
322 goto next_packet;
323 }
324
325 // If we get here, we didn't find a valid command.
326 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
327next_packet:
328 skip_packet (pkt_len);
329
330 // input buffer has space again
331 socket_ev.poll (socket_ev.poll () | PE_R);
332
333 return true;
334}
335
336// callback called when socket is either readable or writable
337void
338client::socket_cb (iow &w, int got)
339{
340 //TODO remove when we have better socket cleanup logic
341 if (destroyed ())
342 {
343 socket_ev.poll (0);
344 return;
345 }
346
347 if (got & PE_W)
348 {
349 write_outputbuffer ();
350
351 if (!outputbuffer.len)
352 socket_ev.poll (socket_ev.poll () & ~PE_W);
353 }
354
355 if (got & PE_R)
356 {
357 //TODO: rate-limit tcp connection in better ways, important
156 358
157 int amount = sizeof (inbuf) - inbuf_len; 359 int amount = sizeof (inbuf) - inbuf_len;
158 360
159 if (amount <= 0) 361 if (!amount)
160 { 362 {
161 LOG (llevError, "packet too large");//TODO 363 // input buffer full
364 socket_ev.poll (socket_ev.poll () & ~PE_R);
162 return -1; 365 return;
163 } 366 }
164 367
165 amount = read (fd, inbuf + inbuf_len, amount); 368 amount = read (fd, inbuf + inbuf_len, amount);
166 369
167 if (!amount) 370 if (!amount)
168 { 371 {
169 status = Ns_Dead; 372 destroy ();
170 return -1; 373 return;
171 } 374 }
172 else if (amount < 0) 375 else if (amount < 0)
173 { 376 {
174 if (errno != EAGAIN && errno != EINTR) 377 if (errno != EAGAIN && errno != EINTR)
175 { 378 {
176 LOG (llevError, "read error: %s", strerror (errno)); 379 LOG (llevError, "read error: %s\n", strerror (errno));
380 destroy ();
177 return -1; 381 return;
178 } 382 }
179 383
180 return 0; 384 // should not be here, normally
385 }
386 else
181 } 387 {
182
183 inbuf_len += amount; 388 inbuf_len += amount;
184 389
185 cst_tot.ibytes += amount; 390 cmd_ev.start ();
186 cst_lst.ibytes += amount; 391 }
187 } 392 }
188} 393}
189 394
395// called whenever we have additional commands to process
190void 396void
191client_socket::skip_packet (int len) 397client::cmd_cb (iw &w)
192{ 398{
193 inbuf_len -= len; 399 if (handle_packet ())
194 memmove (inbuf, inbuf + len, inbuf_len); 400 w.start ();
401 else
402 flush ();
195} 403}
196 404
197/******************************************************************************* 405/*******************************************************************************
198 * 406 *
199 * Start of write related routines. 407 * Start of write related routines.
… …
204 * Adds data to a socket buffer for whatever reason. 412 * Adds data to a socket buffer for whatever reason.
205 * 413 *
206 * ns is the socket we are adding the data to, buf is the start of the 414 * ns is the socket we are adding the data to, buf is the start of the
207 * data, and len is the number of bytes to add. 415 * data, and len is the number of bytes to add.
208 */ 416 */
209 417void
210static void 418client::send (void *buf_, int len)
211add_to_buffer (client_socket *ns, char *buf, int len)
212{ 419{
420 char *buf = (char *)buf_;
421
422 if (destroyed () || !buf)
423 return;
424
425 if (len + outputbuffer.len > SOCKETBUFSIZE)
426 {
427 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
428 // shutdown the socket, this is safer than destroying it immediately
429 // as lots of code in the callchain might still access the map etc.
430 shutdown (fd, SHUT_RDWR);
431 return;
432 }
433
213 int avail, end; 434 int avail, end;
214
215 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216 {
217 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218 ns->status = Ns_Dead;
219 return;
220 }
221 435
222 /* data + end is where we start putting the new data. The last byte 436 /* data + end is where we start putting the new data. The last byte
223 * currently in use is actually data + end -1 437 * currently in use is actually data + end -1
224 */ 438 */
225
226 end = ns->outputbuffer.start + ns->outputbuffer.len; 439 end = outputbuffer.start + outputbuffer.len;
227 /* The buffer is already in a wrapped state, so adjust end */ 440 /* The buffer is already in a wrapped state, so adjust end */
228 if (end >= SOCKETBUFSIZE) 441 if (end >= SOCKETBUFSIZE)
229 end -= SOCKETBUFSIZE; 442 end -= SOCKETBUFSIZE;
230 443
231 avail = SOCKETBUFSIZE - end; 444 avail = SOCKETBUFSIZE - end;
232 445
233 /* We can all fit it behind the current data without wrapping */ 446 /* We can all fit it behind the current data without wrapping */
234 if (avail >= len) 447 if (avail >= len)
235 memcpy (ns->outputbuffer.data + end, buf, len); 448 memcpy (outputbuffer.data + end, buf, len);
236 else 449 else
237 { 450 {
238 memcpy (ns->outputbuffer.data + end, buf, avail); 451 memcpy (outputbuffer.data + end, buf, avail);
239 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 452 memcpy (outputbuffer.data, buf + avail, len - avail);
240 } 453 }
241 454
242 ns->outputbuffer.len += len; 455 outputbuffer.len += len;
243#if 0
244 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245#endif
246}
247
248/**
249 * Writes data to socket.
250 *
251 * When the socket is clear to write, and we have backlogged data, this
252 * is called to write it out.
253 */
254void
255write_socket_buffer (client_socket * ns)
256{
257 int amt, max;
258
259 if (ns->outputbuffer.len == 0)
260 {
261 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262 return;
263 }
264
265 do
266 {
267 max = SOCKETBUFSIZE - ns->outputbuffer.start;
268 if (ns->outputbuffer.len < max)
269 max = ns->outputbuffer.len;
270
271 do
272 {
273 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274 }
275 while ((amt < 0) && (errno == EINTR));
276
277 if (amt < 0)
278 { /* We got an error */
279
280 if (errno != EWOULDBLOCK)
281 {
282 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283 ns->status = Ns_Dead;
284 return;
285 }
286 else
287 { /* EWOULDBLOCK */
288 /* can't write it, so store it away. */
289 ns->can_write = 0;
290 return;
291 }
292 }
293 ns->outputbuffer.start += amt;
294 /* wrap back to start of buffer */
295 if (ns->outputbuffer.start == SOCKETBUFSIZE)
296 ns->outputbuffer.start = 0;
297 ns->outputbuffer.len -= amt;
298#ifdef CS_LOGSTATS
299 cst_tot.obytes += amt;
300 cst_lst.obytes += amt;
301#endif
302 }
303 while (ns->outputbuffer.len > 0);
304}
305
306/**
307 * This writes data to the socket. - It is very low level -
308 * all we try and do is write out the data to the socket
309 * provided (ns). buf is the data to write, len is the number
310 * of bytes to write. IT doesn't return anything - rather, it
311 * updates the ns structure if we get an error.
312 */
313void
314client_socket::send (void *buf_, int len)
315{
316 char *buf = (char *)buf_;
317 char *pos = buf;
318 int amt = 0;
319
320 if (status == Ns_Dead || !buf)
321 {
322 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323 return;
324 }
325
326#ifndef __GNU__ /* This caused problems on Hurd */
327 if (!can_write)
328 {
329 add_to_buffer (this, buf, len);
330 return;
331 }
332#endif
333
334 /* If we manage to write more than we wanted, take it as a bonus */
335 while (len > 0)
336 {
337 do
338 {
339 amt = write (fd, pos, len);
340 }
341 while ((amt < 0) && (errno == EINTR));
342
343 if (amt < 0)
344 { /* We got an error */
345 if (errno != EWOULDBLOCK)
346 {
347 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348 errno, strerror (errno));
349 status = Ns_Dead;
350 return;
351 }
352 else
353 { /* EWOULDBLOCK */
354 /* can't write it, so store it away. */
355 add_to_buffer (this, pos, len);
356 can_write = 0;
357 return;
358 }
359 }
360 /* amt gets set to 0 above in blocking code, so we do this as
361 * an else if to make sure we don't reprocess it.
362 */
363 else if (amt == 0)
364 LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366 len -= amt;
367 pos += amt;
368#ifdef CS_LOGSTATS
369 cst_tot.obytes += amt;
370 cst_lst.obytes += amt;
371#endif
372 }
373} 456}
374 457
375/** 458/**
376 * Takes a string of data, and writes it out to the socket. A very handy 459 * Takes a string of data, and writes it out to the socket. A very handy
377 * shortcut function. 460 * shortcut function.
378 */ 461 */
379
380void 462void
381client_socket::send_packet (packet &sl) 463client::send_packet (packet &sl)
382{ 464{
383 Send_With_Handling (this, &sl); 465 if (destroyed ())
384}
385
386void
387client_socket::send_packet (const char *buf, int len)
388{
389 packet sl;
390
391 sl << data (buf, len);
392 send_packet (sl);
393}
394
395void
396client_socket::send_packet (const char *buf)
397{
398 send_packet (buf, strlen (buf));
399}
400
401/**
402 * Calls Write_To_Socket to send data to the client.
403 *
404 * The only difference in this function is that we take a packet
405 *, and we prepend the length information.
406 */
407void
408Send_With_Handling (client_socket *ns, packet *msg)
409{
410 unsigned char sbuf[4];
411
412 if (ns->status == Ns_Dead || !msg)
413 return; 466 return;
414 467
415 if (msg->length () >= MAXSOCKBUF) 468 if (sl.length () >= MAXSOCKBUF)
416 { 469 {
417 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ()); 470 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
418 /* Almost certainly we've overflowed a buffer, so quite now to make 471 /* Almost certainly we've overflowed a buffer, so quit now to make
419 * it easier to debug. 472 * it easier to debug.
420 */ 473 */
421 abort (); 474 abort ();
422 } 475 }
423 476
424 sbuf[0] = ((uint32) (msg->length ()) >> 8); 477 if (!sl.length ())
425 sbuf[1] = ((uint32) (msg->length ()) ); 478 return;
426 479
427 //TODO: single write, or writev 480 assert (sl.hdrlen == 2);
428 ns->send (sbuf, 2);
429 ns->send (msg->buf, msg->length ());
430}
431 481
482 sl.buf_ [0] = sl.length () >> 8;
483 sl.buf_ [1] = sl.length () ;
484
485 send (sl.buf_, sl.length () + sl.hdrlen);
486}
487
488void
489client::send_packet (const char *buf, int len)
490{
491 packet sl;
492
493 sl << data (buf, len);
494 send_packet (sl);
495}
496
497void
498client::send_packet (const char *buf)
499{
500 send_packet (buf, strlen (buf));
501}
502
503void
504client::send_packet_printf (const char *format, ...)
505{
506 packet sl;
507
508 va_list ap;
509 va_start (ap, format);
510 sl.vprintf (format, ap);
511 va_end (ap);
512
513 send_packet (sl);
514}
515
516// returns true when the message needs special (read: perl) treatment
517static bool
518msg_is_special (const char *msg)
519{
520 return msg [strcspn (msg, "<[&\n")];
521}
522
523void
524client::send_msg (int color, const char *type, const char *msg)
525{
526 if (msg_is_special (msg))
527 cfperl_send_msg (this, color, type, msg);
528 else if (can_msg)
529 send_packet_printf ("msg %d %s %s", color, type, msg);
530 else if (color < 0)
531 return; // client cannot handle this
532 else
533 send_packet_printf ("drawinfo %d %s", color, msg);
534}
535
536void
537client::send_drawinfo (const char *msg, int flags)
538{
539 send_msg (flags, "log", msg);
540}
541
432/****************************************************************************** 542/***********************************************************************
433 * 543 *
434 * statistics logging functions. 544 * packet functions/utilities
435 * 545 *
436 ******************************************************************************/ 546 **********************************************************************/
437 547
438#ifdef CS_LOGSTATS 548packet::packet (const char *name)
439
440/* cst_tot is for the life of the server, cst_last is for the last series of
441 * stats
442 */
443CS_Stats cst_tot, cst_lst;
444
445/**
446 * Writes out the gathered stats. We clear cst_lst.
447 */
448void
449write_cs_stats (void)
450{ 549{
451 time_t now = time (NULL); 550 reset ();
452 551
453 /* If no connections recently, don't both to log anything */ 552 int len = strlen (name);
454 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 553 memcpy (cur, name, len); cur += len;
455 return; 554 *cur++ = ' ';
456
457 /* CSSTAT is put in so scripts can easily find the line */
458 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
459 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
460 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
461 cst_lst.ibytes = 0;
462 cst_lst.obytes = 0;
463 cst_lst.time_start = now;
464} 555}
465#endif
466 556
557packet &packet::operator <<(const ber32 v)
558{
559 enum { maxlen = 32 / 7 + 1};
560 uint8 buf[maxlen];
561 uint8 *p = buf + maxlen;
562 uint32 val = v.val;
563
564 *--p = val & 0x7F;
565
566 while (val > 0x7F)
567 {
568 val >>= 7;
569 *--p = (val & 0x7F) | 0x80;
570 }
571
572 return *this << data (p, buf + maxlen - p);
573}
574
575packet &packet::operator <<(const data &v)
576{
577 if (room () < v.len)
578 reset ();
579 else
580 {
581 if (v.len)
582 {
583 memcpy (cur, v.ptr, v.len);
584 cur += v.len;
585 }
586 }
587
588 return *this;
589}
590
591packet &packet::operator <<(const data8 &v)
592{
593 unsigned int len = min (v.len, 0x00FF);
594 return *this << uint8 (len) << data (v.ptr, len);
595}
596
597packet &packet::operator <<(const data16 &v)
598{
599 unsigned int len = min (v.len, 0xFFFF);
600 return *this << uint16 (len) << data (v.ptr, len);
601}
602
603packet &packet::operator <<(const char *v)
604{
605 return *this << data (v, strlen (v ? v : 0));
606}
607
608void
609packet::vprintf (const char *format, va_list ap)
610{
611 int size = room ();
612
613 int len = vsnprintf ((char *)cur, size, format, ap);
614
615 if (len >= size)
616 return reset ();
617
618 cur += len;
619}
620

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