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Revision 1.14 by root, Thu Dec 14 01:21:58 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 <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 (NewSocket * 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 if (!((pticks + fd) & 7))
53 {
59 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 55 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
62 57
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 58 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 59 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 60 rtt = tcpi.tcpi_rtt;
61 rttvar = tcpi.tcpi_rttvar;
66 62
67 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))
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 { 64 {
65 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
66 write_outputbuffer ();
67
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 68 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); 69 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
72 ns->status = Ns_Dead; 70 destroy ();
73 } 71 }
72 }
74 } 73 }
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 74#endif
81}
82 75
83/*********************************************************************** 76 /**
84 * 77 * Writes data to socket.
85 * packet functions/utilities 78 *
86 * 79 * When the socket is clear to write, and we have backlogged data, this
87 **********************************************************************/ 80 * is called to write it out.
81 */
88 82
89packet &packet::operator <<(const data &v) 83 // write a nop to the socket at least every IDLE_NOP seconds.
90{ 84 if (!outputbuffer.len)
91 if (v.len)
92 {
93 memcpy (buf + len, v.ptr, v.len);
94 len += v.len;
95 } 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 96
97 return *this; 97 if (socket_ev.poll () & PE_W)
98} 98 return;
99 99
100packet &packet::operator <<(const data8 &v) 100 last_send = NOW;
101{ 101 write_outputbuffer ();
102 unsigned int len = min (v.len, 0x00FF);
103 return *this << uint8 (len) << data (v.ptr, len);
104} 102}
105 103
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 104void
118packet::printf (const char *format, ...) 105client::write_outputbuffer ()
119{ 106{
120 va_list ap; 107 while (outputbuffer.len)
121 va_start (ap, format); 108 {
109 int res = write (fd, outputbuffer.data + outputbuffer.start,
110 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
122 111
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); 112 if (res > 0)
113 {
114 outputbuffer.start += res;
115 /* wrap back to start of buffer */
116 if (outputbuffer.start == SOCKETBUFSIZE)
117 outputbuffer.start = 0;
124 118
125 va_end (ap); 119 outputbuffer.len -= res;
120 }
121 else if (res == 0)
122 {
123 LOG (llevError, "socket write failed, connection closed.\n");
124 destroy ();
125 return;
126 }
127 else if (errno == EINTR)
128 {
129 // just retry
130 }
131 else if (errno == EAGAIN)
132 {
133 // delay till ready
134 socket_ev.poll (socket_ev.poll () | PE_W);
135 socket_ev.start ();
136 return;
137 }
138 else
139 {
140 LOG (llevError, "socket write failed: %s\n", strerror (errno));
141 destroy ();
142 return;
143 }
144 }
145
146 socket_ev.poll (socket_ev.poll () & ~PE_W);
126} 147}
127 148
128/****************************************************************************** 149/******************************************************************************
129 * 150 *
130 * Start of read routines. 151 * Start of read routines.
131 * 152 *
132 ******************************************************************************/ 153 ******************************************************************************/
133 154
134int 155int
135NewSocket::read_packet () 156client::next_packet ()
136{ 157{
137 for (;;)
138 {
139 if (inbuf_len >= 2) 158 if (inbuf_len >= 2)
140 { 159 {
141 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 160 int pkt_len = (inbuf [0] << 8) | inbuf [1];
142 161
143 if (inbuf_len >= 2 + pkt_len) 162 if (inbuf_len >= 2 + pkt_len)
144 return pkt_len + 2; 163 return 2 + pkt_len;
164
165 if (inbuf_len == sizeof (inbuf))
145 } 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
146 354
147 int amount = sizeof (inbuf) - inbuf_len; 355 int amount = sizeof (inbuf) - inbuf_len;
148 356
149 if (amount <= 0) 357 if (!amount)
150 { 358 {
151 LOG (llevError, "packet too large");//TODO 359 // input buffer full
360 socket_ev.poll (socket_ev.poll () & ~PE_R);
152 return -1; 361 return;
153 } 362 }
154 363
155 amount = read (fd, inbuf + inbuf_len, amount); 364 amount = read (fd, inbuf + inbuf_len, amount);
156 365
157 if (!amount) 366 if (!amount)
158 { 367 {
159 status = Ns_Dead; 368 destroy ();
160 return -1; 369 return;
161 } 370 }
162 else if (amount < 0) 371 else if (amount < 0)
163 { 372 {
164 if (errno != EAGAIN && errno != EINTR) 373 if (errno != EAGAIN && errno != EINTR)
165 { 374 {
166 LOG (llevError, "read error: %s", strerror (errno)); 375 LOG (llevError, "read error: %s\n", strerror (errno));
376 destroy ();
167 return -1; 377 return;
168 } 378 }
169 379
170 return 0; 380 // should not be here, normally
381 }
382 else
171 } 383 {
172
173 inbuf_len += amount; 384 inbuf_len += amount;
174 385
175 cst_tot.ibytes += amount; 386 cmd_ev.start ();
176 cst_lst.ibytes += amount; 387 }
177 } 388 }
178} 389}
179 390
391// called whenever we have additional commands to process
180void 392void
181NewSocket::skip_packet (int len) 393client::cmd_cb (iw &w)
182{ 394{
183 inbuf_len -= len; 395 if (handle_packet ())
184 memmove (inbuf, inbuf + len, inbuf_len); 396 w.start ();
397 else
398 flush ();
185} 399}
186 400
187/******************************************************************************* 401/*******************************************************************************
188 * 402 *
189 * Start of write related routines. 403 * Start of write related routines.
… …
194 * Adds data to a socket buffer for whatever reason. 408 * Adds data to a socket buffer for whatever reason.
195 * 409 *
196 * ns is the socket we are adding the data to, buf is the start of the 410 * 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. 411 * data, and len is the number of bytes to add.
198 */ 412 */
199 413void
200static void 414client::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 415{
416 char *buf = (char *)buf_;
417
418 if (destroyed () || !buf)
419 return;
420
421 if (len + outputbuffer.len > SOCKETBUFSIZE)
422 {
423 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
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);
427 return;
428 }
429
203 int avail, end; 430 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 }
211 431
212 /* data + end is where we start putting the new data. The last byte 432 /* data + end is where we start putting the new data. The last byte
213 * currently in use is actually data + end -1 433 * currently in use is actually data + end -1
214 */ 434 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 435 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 436 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 437 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 438 end -= SOCKETBUFSIZE;
220 439
221 avail = SOCKETBUFSIZE - end; 440 avail = SOCKETBUFSIZE - end;
222 441
223 /* We can all fit it behind the current data without wrapping */ 442 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 443 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 444 memcpy (outputbuffer.data + end, buf, len);
226 else 445 else
227 { 446 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 447 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 448 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 449 }
231 450
232 ns->outputbuffer.len += len; 451 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} 452}
364 453
365/** 454/**
366 * 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
367 * shortcut function. 456 * shortcut function.
368 */ 457 */
369
370void 458void
371NewSocket::send_packet (packet &sl) 459client::send_packet (packet &sl)
372{ 460{
373 Send_With_Handling (this, &sl); 461 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; 462 return;
404 463
405 if (msg->len >= MAXSOCKBUF) 464 if (sl.length () >= MAXSOCKBUF)
406 { 465 {
407 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 466 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 467 /* Almost certainly we've overflowed a buffer, so quit now to make
409 * it easier to debug. 468 * it easier to debug.
410 */ 469 */
411 abort (); 470 abort ();
412 } 471 }
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}
419 472
473 if (!sl.length ())
474 return;
475
476 assert (sl.hdrlen == 2);
477
478 sl.buf_ [0] = sl.length () >> 8;
479 sl.buf_ [1] = sl.length () ;
480
481 send (sl.buf_, sl.length () + sl.hdrlen);
482}
483
484void
485client::send_packet (const char *buf, int len)
486{
487 packet sl;
488
489 sl << data (buf, len);
490 send_packet (sl);
491}
492
493void
494client::send_packet (const char *buf)
495{
496 send_packet (buf, strlen (buf));
497}
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
420/****************************************************************************** 534/***********************************************************************
421 * 535 *
422 * statistics logging functions. 536 * packet functions/utilities
423 * 537 *
424 ******************************************************************************/ 538 **********************************************************************/
425 539
426#ifdef CS_LOGSTATS 540packet::packet (const char *name)
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{ 541{
439 time_t now = time (NULL); 542 reset ();
440 543
441 /* If no connections recently, don't both to log anything */ 544 int len = strlen (name);
442 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 545 memcpy (cur, name, len); cur += len;
443 return; 546 *cur++ = ' ';
444
445 /* CSSTAT is put in so scripts can easily find the line */
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} 547}
454#endif
455 548
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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