ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/deliantra/server/socket/lowlevel.C
(Generate patch)

Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.14 by root, Thu Dec 14 01:21:58 2006 UTC vs.
Revision 1.50 by root, Thu Jul 12 19:36:58 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 <newclient.h>
39#include <sproto.h> 26#include <sproto.h>
40#include <cstdarg> 27#include <cstdarg>
41 28
42#ifdef __linux__ 29#if HAVE_TCP_INFO
43# include <sys/types.h> 30# include <sys/types.h>
44# include <sys/socket.h> 31# include <sys/socket.h>
45# include <netinet/in.h> 32# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 33# include <netinet/tcp.h>
48#endif 34#endif
49 35
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 36#define HAVE_SIOCOUTQ 1 //TODO configure.ac support
51// easily die in 20 seconds... 37#if HAVE_SIOCOUTQ
52#define SOCKET_TIMEOUT1 10 38# include <linux/sockios.h>
53#define SOCKET_TIMEOUT2 20
54
55void
56Socket_Flush (NewSocket * ns)
57{
58#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi);
62
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead;
73 }
74 }
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 39#endif
81}
82 40
83/*********************************************************************** 41// disconnect a socket after this many seconds without an ack
84 * 42#define SOCKET_TIMEOUT 8.
85 * packet functions/utilities
86 *
87 **********************************************************************/
88 43
89packet &packet::operator <<(const data &v) 44// force a packet when idle for more than this many seconds,
45// forcing an ack regularly.
46#define IDLE_PING 2.
47
48void
49client::flush ()
90{ 50{
91 if (v.len) 51 if (destroyed ())
52 return;
53
54# if HAVE_SIOCOUTQ
92 { 55 {
93 memcpy (buf + len, v.ptr, v.len); 56 int value;
94 len += v.len; 57
58 if (!ioctl (fd, SIOCOUTQ, &value))
59 outq = value;
60 }
61# endif
62
63#if HAVE_TCP_INFO
64 // check about once per second, spread evenly over all clients
65 // do this only when player is active
66 if (!((pticks + fd) & 7) && pl && pl->active)
95 } 67 {
68 // check time of last ack, and, if too old, kill connection
69 struct tcp_info tcpi;
70 socklen_t len = sizeof (tcpi);
96 71
97 return *this; 72 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
98} 73 {
74 if (tcpi.tcpi_snd_mss)
75 mss = tcpi.tcpi_snd_mss;
99 76
100packet &packet::operator <<(const data8 &v) 77 rtt = tcpi.tcpi_rtt;
101{ 78 rttvar = tcpi.tcpi_rttvar;
102 unsigned int len = min (v.len, 0x00FF);
103 return *this << uint8 (len) << data (v.ptr, len);
104}
105 79
106packet &packet::operator <<(const data16 &v) 80 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
107{ 81 {
108 unsigned int len = min (v.len, 0xFFFF); 82 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
109 return *this << uint16 (len) << data (v.ptr, len); 83 write_outputbuffer ();
110}
111 84
112packet &packet::operator <<(const char *v) 85 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
113{ 86 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
114 return *this << data (v, strlen (v ? v : 0)); 87 destroy ();
115} 88 }
89 }
90 }
91#endif
116 92
117void 93 /**
118packet::printf (const char *format, ...) 94 * Writes data to socket.
119{ 95 *
120 va_list ap; 96 * When the socket is clear to write, and we have backlogged data, this
121 va_start (ap, format); 97 * is called to write it out.
98 */
122 99
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); 100 // write a nop to the socket at least every IDLE_NOP seconds.
101 if (!outputbuffer.len)
102 {
103 if (last_send + IDLE_PING <= NOW && pl && pl->active)
104 {
105 // this is a bit ugly, but map1/map1a seem to be the only
106 // nop'able commands and they are quite small.
107 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
108 send_packet (sl);
109 }
110 else
111 return;
112 }
124 113
125 va_end (ap); 114 if (socket_ev.poll () & PE_W)
115 return;
116
117 last_send = NOW;
118 write_outputbuffer ();
119}
120
121void
122client::write_outputbuffer ()
123{
124 while (outputbuffer.len)
125 {
126 int res = write (fd, outputbuffer.data + outputbuffer.start,
127 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
128
129 if (res > 0)
130 {
131 outputbuffer.start += res;
132 /* wrap back to start of buffer */
133 if (outputbuffer.start == SOCKETBUFSIZE)
134 outputbuffer.start = 0;
135
136 outputbuffer.len -= res;
137 }
138 else if (res == 0)
139 {
140 LOG (llevError, "socket write failed, connection closed.\n");
141 destroy ();
142 return;
143 }
144 else if (errno == EINTR)
145 {
146 // just retry
147 }
148 else if (errno == EAGAIN)
149 {
150 // delay till ready
151 socket_ev.poll (socket_ev.poll () | PE_W);
152 socket_ev.start ();
153 return;
154 }
155 else
156 {
157 LOG (llevError, "socket write failed: %s\n", strerror (errno));
158 destroy ();
159 return;
160 }
161 }
162
163 socket_ev.poll (socket_ev.poll () & ~PE_W);
126} 164}
127 165
128/****************************************************************************** 166/******************************************************************************
129 * 167 *
130 * Start of read routines. 168 * Start of read routines.
131 * 169 *
132 ******************************************************************************/ 170 ******************************************************************************/
133 171
134int 172int
135NewSocket::read_packet () 173client::next_packet ()
136{ 174{
137 for (;;)
138 {
139 if (inbuf_len >= 2) 175 if (inbuf_len >= 2)
140 { 176 {
141 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 177 int pkt_len = (inbuf [0] << 8) | inbuf [1];
142 178
143 if (inbuf_len >= 2 + pkt_len) 179 if (inbuf_len >= 2 + pkt_len)
144 return pkt_len + 2; 180 return 2 + pkt_len;
181
182 if (inbuf_len == sizeof (inbuf))
145 } 183 {
184 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
185 destroy ();
186 return -1;
187 }
188 }
189
190 return 0;
191}
192
193void
194client::skip_packet (int len)
195{
196 inbuf_len -= len;
197 memmove (inbuf, inbuf + len, inbuf_len);
198}
199
200/*****************************************************************************
201 * Start of command dispatch area.
202 * The commands here are protocol commands.
203 ****************************************************************************/
204
205// SocketCommand, PlayingCommand, should not exist with those ugly casts
206#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
207#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
208
209/**
210 * Dispatch table for the server.
211 */
212static struct packet_type packets[] = {
213 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
214 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
215
216 {"examine", PC(ExamineCmd) PF_PLAYING },
217 {"ex", PC(ExCmd) PF_PLAYING },
218 {"apply", PC(ApplyCmd) PF_PLAYING },
219 {"lookat", PC(LookAt) PF_PLAYING },
220 {"lock", PC(LockItem) PF_PLAYING },
221 {"mark", PC(MarkItem) PF_PLAYING },
222 {"move", PC(MoveCmd) PF_PLAYING },
223 {"ext", PC(ExtCmd) 0 }, // CF+
224 {"mapredraw", PC(MapRedrawCmd) 0 },
225 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
226
227 {"reply", SC(ReplyCmd) 0 },
228 {"exti", SC(ExtiCmd) 0 }, // CF+
229 {"addme", SC(AddMeCmd) 0 },
230 {"askface", SC(AskFaceCmd) 0 },
231 {"requestinfo", SC(RequestInfo) 0 },
232 {"setfacemode", SC(SetFaceMode) 0 },
233 {"setsound", SC(SetSound) 0 },
234 {"setup", SC(SetUp) 0 },
235 {"version", SC(VersionCmd) 0 },
236 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
237 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
238 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
239};
240
241bool
242client::may_execute (const packet_type *pkt) const
243{
244 return (!(pkt->flags & PF_PLAYER) || pl)
245 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
246}
247
248// HACK: some commands currently should be executed
249// even when the player is frozen. this hack detects
250// those commands. it should be folded into may_execute,
251// but kept seperate to emphasise the hack aspect, i.e.
252// do it better, then remove.
253static bool
254always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
255{
256 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
257 return false;
258
259 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
260 return false;
261
262 if (pkt->flags & PF_COMMAND6)
263 {
264 data += 6;
265 len -= 6;
266 }
267
268 if (len > 4 && !strncmp (data, "say " , 4))
269 return true;
270 if (len > 5 && !strncmp (data, "chat ", 5))
271 return true;
272
273 return false;
274}
275
276void
277client::execute (const packet_type *pkt, char *data, int datalen)
278{
279 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
280 {
281 //TODO: only one format
282 if (pkt->flags & PF_PLAYER)
283 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
284 else
285 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
286 }
287 else
288 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
289}
290
291bool
292client::handle_packet ()
293{
294 int pkt_len = next_packet ();
295
296 if (!pkt_len)
297 return false;
298 else if (pkt_len < 0)
299 {
300 LOG (llevError, "read error on player %s\n",
301 pl && pl->ob ? &pl->ob->name : "[anonymous]");
302 destroy ();
303 return false;
304 }
305
306 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
307
308 /* First, break out beginning word. There are at least
309 * a few commands that do not have any paremeters. If
310 * we get such a command, don't worry about trying
311 * to break it up.
312 */
313 int datalen;
314 char *data = strchr ((char *)inbuf + 2, ' ');
315
316 if (data)
317 {
318 *data++ = 0;
319 datalen = pkt_len - (data - (char *)inbuf);
320 }
321 else
322 {
323 data = (char *)inbuf + 2; // better read garbage than segfault
324 datalen = 0;
325 }
326
327 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
328 if (!strcmp ((char *)inbuf + 2, pkt->name))
329 {
330 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
331 queue_command (pkt, data, datalen);
332 else
333 execute (pkt, data, datalen);
334
335 goto next_packet;
336 }
337
338 // If we get here, we didn't find a valid command.
339 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
340next_packet:
341 skip_packet (pkt_len);
342
343 // input buffer has space again
344 socket_ev.poll (socket_ev.poll () | PE_R);
345
346 return true;
347}
348
349// callback called when socket is either readable or writable
350void
351client::socket_cb (iow &w, int got)
352{
353 //TODO remove when we have better socket cleanup logic
354 if (destroyed ())
355 {
356 socket_ev.poll (0);
357 return;
358 }
359
360 if (got & PE_W)
361 {
362 write_outputbuffer ();
363
364 if (!outputbuffer.len)
365 socket_ev.poll (socket_ev.poll () & ~PE_W);
366 }
367
368 if (got & PE_R)
369 {
370 //TODO: rate-limit tcp connection in better ways, important
146 371
147 int amount = sizeof (inbuf) - inbuf_len; 372 int amount = sizeof (inbuf) - inbuf_len;
148 373
149 if (amount <= 0) 374 if (!amount)
150 { 375 {
151 LOG (llevError, "packet too large");//TODO 376 // input buffer full
377 socket_ev.poll (socket_ev.poll () & ~PE_R);
152 return -1; 378 return;
153 } 379 }
154 380
155 amount = read (fd, inbuf + inbuf_len, amount); 381 amount = read (fd, inbuf + inbuf_len, amount);
156 382
157 if (!amount) 383 if (!amount)
158 { 384 {
159 status = Ns_Dead; 385 destroy ();
160 return -1; 386 return;
161 } 387 }
162 else if (amount < 0) 388 else if (amount < 0)
163 { 389 {
164 if (errno != EAGAIN && errno != EINTR) 390 if (errno != EAGAIN && errno != EINTR)
165 { 391 {
166 LOG (llevError, "read error: %s", strerror (errno)); 392 LOG (llevError, "read error: %s\n", strerror (errno));
393 destroy ();
167 return -1; 394 return;
168 } 395 }
169 396
170 return 0; 397 // should not be here, normally
398 }
399 else
171 } 400 {
172
173 inbuf_len += amount; 401 inbuf_len += amount;
174 402
175 cst_tot.ibytes += amount; 403 cmd_ev.start ();
176 cst_lst.ibytes += amount; 404 }
177 } 405 }
178} 406}
179 407
408// called whenever we have additional commands to process
180void 409void
181NewSocket::skip_packet (int len) 410client::cmd_cb (iw &w)
182{ 411{
183 inbuf_len -= len; 412 if (handle_packet ())
184 memmove (inbuf, inbuf + len, inbuf_len); 413 w.start ();
414 else
415 flush ();
185} 416}
186 417
187/******************************************************************************* 418/*******************************************************************************
188 * 419 *
189 * Start of write related routines. 420 * Start of write related routines.
… …
194 * Adds data to a socket buffer for whatever reason. 425 * Adds data to a socket buffer for whatever reason.
195 * 426 *
196 * ns is the socket we are adding the data to, buf is the start of the 427 * 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. 428 * data, and len is the number of bytes to add.
198 */ 429 */
199 430void
200static void 431client::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 432{
433 char *buf = (char *)buf_;
434
435 if (destroyed () || !buf)
436 return;
437
438 if (len + outputbuffer.len > SOCKETBUFSIZE)
439 {
440 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
441 // shutdown the socket, this is safer than destroying it immediately
442 // as lots of code in the callchain might still access the map etc.
443 shutdown (fd, SHUT_RDWR);
444 return;
445 }
446
203 int avail, end; 447 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 }
211 448
212 /* data + end is where we start putting the new data. The last byte 449 /* data + end is where we start putting the new data. The last byte
213 * currently in use is actually data + end -1 450 * currently in use is actually data + end -1
214 */ 451 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 452 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 453 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 454 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 455 end -= SOCKETBUFSIZE;
220 456
221 avail = SOCKETBUFSIZE - end; 457 avail = SOCKETBUFSIZE - end;
222 458
223 /* We can all fit it behind the current data without wrapping */ 459 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 460 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 461 memcpy (outputbuffer.data + end, buf, len);
226 else 462 else
227 { 463 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 464 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 465 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 466 }
231 467
232 ns->outputbuffer.len += len; 468 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} 469}
364 470
365/** 471/**
366 * Takes a string of data, and writes it out to the socket. A very handy 472 * Takes a string of data, and writes it out to the socket. A very handy
367 * shortcut function. 473 * shortcut function.
368 */ 474 */
369
370void 475void
371NewSocket::send_packet (packet &sl) 476client::send_packet (packet &sl)
372{ 477{
373 Send_With_Handling (this, &sl); 478 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; 479 return;
404 480
405 if (msg->len >= MAXSOCKBUF) 481 if (sl.length () >= MAXSOCKBUF)
406 { 482 {
407 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 483 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 484 /* Almost certainly we've overflowed a buffer, so quit now to make
409 * it easier to debug. 485 * it easier to debug.
410 */ 486 */
411 abort (); 487 abort ();
412 } 488 }
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}
419 489
490 if (!sl.length ())
491 return;
492
493 assert (sl.hdrlen == 2);
494
495 sl.buf_ [0] = sl.length () >> 8;
496 sl.buf_ [1] = sl.length () ;
497
498 send (sl.buf_, sl.length () + sl.hdrlen);
499}
500
501void
502client::send_packet (const char *buf, int len)
503{
504 packet sl;
505
506 sl << data (buf, len);
507 send_packet (sl);
508}
509
510void
511client::send_packet (const char *buf)
512{
513 send_packet (buf, strlen (buf));
514}
515
516void
517client::send_packet_printf (const char *format, ...)
518{
519 packet sl;
520
521 va_list ap;
522 va_start (ap, format);
523 sl.vprintf (format, ap);
524 va_end (ap);
525
526 send_packet (sl);
527}
528
529// returns true when the message needs special (read: perl) treatment
530static bool
531msg_is_special (const char *msg)
532{
533 return msg [strcspn (msg, "<[&\n")];
534}
535
536void
537client::send_msg (int color, const char *type, const char *msg)
538{
539 if (msg_is_special (msg))
540 cfperl_send_msg (this, color, type, msg);
541 else if (can_msg)
542 send_packet_printf ("msg %d %s %s", color, type, msg);
543 else if (color < 0)
544 return; // client cannot handle this
545 else
546 send_packet_printf ("drawinfo %d %s", color, msg);
547}
548
549void
550client::send_drawinfo (const char *msg, int flags)
551{
552 send_msg (flags, "log", msg);
553}
554
420/****************************************************************************** 555/***********************************************************************
421 * 556 *
422 * statistics logging functions. 557 * packet functions/utilities
423 * 558 *
424 ******************************************************************************/ 559 **********************************************************************/
425 560
426#ifdef CS_LOGSTATS 561packet::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{ 562{
439 time_t now = time (NULL); 563 reset ();
440 564
441 /* If no connections recently, don't both to log anything */ 565 int len = strlen (name);
442 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 566 memcpy (cur, name, len); cur += len;
443 return; 567 *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} 568}
454#endif
455 569
570packet &packet::operator <<(const ber32 v)
571{
572 enum { maxlen = 32 / 7 + 1};
573 uint8 buf[maxlen];
574 uint8 *p = buf + maxlen;
575 uint32 val = v.val;
576
577 *--p = val & 0x7F;
578
579 while (val > 0x7F)
580 {
581 val >>= 7;
582 *--p = (val & 0x7F) | 0x80;
583 }
584
585 return *this << data (p, buf + maxlen - p);
586}
587
588packet &packet::operator <<(const data &v)
589{
590 if (room () < v.len)
591 reset ();
592 else
593 {
594 if (v.len)
595 {
596 memcpy (cur, v.ptr, v.len);
597 cur += v.len;
598 }
599 }
600
601 return *this;
602}
603
604packet &packet::operator <<(const data8 &v)
605{
606 unsigned int len = min (v.len, 0x00FF);
607 return *this << uint8 (len) << data (v.ptr, len);
608}
609
610packet &packet::operator <<(const data16 &v)
611{
612 unsigned int len = min (v.len, 0xFFFF);
613 return *this << uint16 (len) << data (v.ptr, len);
614}
615
616packet &packet::operator <<(const char *v)
617{
618 return *this << data (v, strlen (v ? v : 0));
619}
620
621void
622packet::vprintf (const char *format, va_list ap)
623{
624 int size = room ();
625
626 int len = vsnprintf ((char *)cur, size, format, ap);
627
628 if (len >= size)
629 return reset ();
630
631 cur += len;
632}
633

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines