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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.6 by root, Thu Sep 14 22:34:06 2006 UTC vs.
Revision 1.43 by root, Sat Jun 9 22:54:04 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 41
41#ifdef __linux__ 42#ifdef __linux__
42# include <sys/types.h> 43# include <sys/types.h>
43# include <sys/socket.h> 44# include <sys/socket.h>
44# include <netinet/in.h> 45# include <netinet/in.h>
45# define TCP_HZ 1000 // sorry...
46# include <netinet/tcp.h> 46# include <netinet/tcp.h>
47#endif 47#endif
48 48
49// 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
50// easily die in 20 seconds...
51#define SOCKET_TIMEOUT1 10 50#define SOCKET_TIMEOUT 8.
52#define SOCKET_TIMEOUT2 20
53 51
52// force a packet when idle for more than this many seconds,
53// forcing an ack regularly.
54#define IDLE_PING 2.
55
54void 56void
55Socket_Flush (NewSocket * ns) 57client::flush ()
56{ 58{
59 if (destroyed ())
60 return;
61
57#ifdef __linux__ 62#ifdef __linux__
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
58 // check time of last ack, and, if too old, kill connection 66 // check time of last ack, and, if too old, kill connection
59 struct tcp_info tcpi; 67 struct tcp_info tcpi;
60 socklen_t len = sizeof (tcpi); 68 socklen_t len = sizeof (tcpi);
61 69
62 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))
63 { 71 {
64 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 72 rtt = tcpi.tcpi_rtt;
73 rttvar = tcpi.tcpi_rttvar;
65 74
66 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))
67 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
68 { 76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
69 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,
70 (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);
71 ns->status = Ns_Dead; 82 destroy ();
72 } 83 }
84 }
73 } 85 }
74
75 int val;
76
77 val = 0;
78 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
79 val = 1;
80 setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
81#endif 86#endif
82}
83 87
88 /**
89 * Writes data to socket.
90 *
91 * When the socket is clear to write, and we have backlogged data, this
92 * is called to write it out.
93 */
94
95 // write a nop to the socket at least every IDLE_NOP seconds.
96 if (!outputbuffer.len)
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 }
108
109 if (socket_ev.poll () & PE_W)
110 return;
111
112 last_send = NOW;
113 write_outputbuffer ();
114}
115
116void
117client::write_outputbuffer ()
118{
119 while (outputbuffer.len)
120 {
121 int res = write (fd, outputbuffer.data + outputbuffer.start,
122 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
123
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;
130
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);
159}
160
161/******************************************************************************
162 *
163 * Start of read routines.
164 *
165 ******************************************************************************/
166
167int
168client::next_packet ()
169{
170 if (inbuf_len >= 2)
171 {
172 int pkt_len = (inbuf [0] << 8) | inbuf [1];
173
174 if (inbuf_len >= 2 + pkt_len)
175 return 2 + pkt_len;
176
177 if (inbuf_len == sizeof (inbuf))
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
84/*********************************************************************** 195/*****************************************************************************
85 * 196 * Start of command dispatch area.
86 * SockList functions/utilities 197 * The commands here are protocol commands.
87 *
88 **********************************************************************/ 198 ****************************************************************************/
89 199
90void 200// SocketCommand, PlayingCommand, should not exist with those ugly casts
91SockList_Init (SockList * sl) 201#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
92{ 202#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
93 sl->len = 0;
94 sl->buf = NULL;
95}
96 203
97void 204/**
98SockList_AddInt (SockList * sl, uint32 data) 205 * Dispatch table for the server.
99{
100 sl->buf[sl->len++] = (data >> 24) & 0xff;
101 sl->buf[sl->len++] = (data >> 16) & 0xff;
102 sl->buf[sl->len++] = (data >> 8) & 0xff;
103 sl->buf[sl->len++] = data & 0xff;
104}
105
106void
107SockList_AddInt64 (SockList * sl, uint64 data)
108{
109 sl->buf[sl->len++] = (char) ((data >> 56) & 0xff);
110 sl->buf[sl->len++] = (char) ((data >> 48) & 0xff);
111 sl->buf[sl->len++] = (char) ((data >> 40) & 0xff);
112 sl->buf[sl->len++] = (char) ((data >> 32) & 0xff);
113
114 sl->buf[sl->len++] = (char) ((data >> 24) & 0xff);
115 sl->buf[sl->len++] = (char) ((data >> 16) & 0xff);
116 sl->buf[sl->len++] = (char) ((data >> 8) & 0xff);
117 sl->buf[sl->len++] = (char) (data & 0xff);
118}
119
120/* Basically does the reverse of SockList_AddInt, but on
121 * strings instead. Same for the GetShort, but for 16 bits.
122 */ 206 */
123int 207static struct packet_type packets[] = {
124GetInt_String (unsigned char *data) 208 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
125{ 209 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
126 return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]);
127}
128 210
129short 211 {"examine", PC(ExamineCmd) PF_PLAYING },
130GetShort_String (unsigned char *data) 212 {"ex", PC(ExCmd) PF_PLAYING },
131{ 213 {"apply", PC(ApplyCmd) PF_PLAYING },
132 return ((data[0] << 8) + data[1]); 214 {"lookat", PC(LookAt) PF_PLAYING },
133} 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+
134 221
135/****************************************************************************** 222 {"reply", SC(ReplyCmd) 0 },
136 * 223 {"exti", SC(ExtiCmd) 0 }, // CF+
137 * Start of read routines. 224 {"addme", SC(AddMeCmd) 0 },
138 * 225 {"askface", SC(AskFaceCmd) 0 },
139 ******************************************************************************/ 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};
140 235
141/** 236bool
142 * This reads from fd and puts the data in sl. We return true if we think 237client::may_execute (const packet_type *pkt) const
143 * we have a full packet, 0 if we have a partial packet. The only processing
144 * we do is remove the intial size value. len (As passed) is the size of the
145 * buffer allocated in the socklist. We make the assumption the buffer is
146 * at least 2 bytes long.
147 */
148
149int
150SockList_ReadPacket (int fd, SockList * sl, int len)
151{ 238{
152 int stat, toread; 239 return (!(pkt->flags & PF_PLAYER) || pl)
240 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
241}
153 242
154 /* Sanity check - shouldn't happen */ 243// HACK: some commands currently should be executed
155 if (sl->len < 0) 244// even when the player is frozen. this hack detects
156 { 245// those commands. it should be folded into may_execute,
157 abort (); 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)
158 } 258 {
159 /* We already have a partial packet */ 259 data += 6;
160 if (sl->len < 2) 260 len -= 6;
161 { 261 }
162#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
163 262
164 stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0); 263 if (len > 4 && !strncmp (data, "say " , 4))
264 return true;
265 if (len > 5 && !strncmp (data, "chat ", 5))
266 return true;
165 267
166#else 268 return false;
167 do 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))
168 { 324 {
169 stat = read (fd, sl->buf + sl->len, 2 - sl->len); 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
366
367 int amount = sizeof (inbuf) - inbuf_len;
368
369 if (!amount)
170 } 370 {
171 while ((stat == -1) && (errno == EINTR)); 371 // input buffer full
172#endif 372 socket_ev.poll (socket_ev.poll () & ~PE_R);
173 if (stat < 0) 373 return;
174 { 374 }
175 /* In non blocking mode, EAGAIN is set when there is no 375
176 * data available. 376 amount = read (fd, inbuf + inbuf_len, amount);
177 */ 377
178#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 378 if (!amount)
179 if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) 379 {
380 destroy ();
381 return;
382 }
383 else if (amount < 0)
384 {
385 if (errno != EAGAIN && errno != EINTR)
180 { 386 {
181 if (WSAGetLastError () == WSAECONNRESET) 387 LOG (llevError, "read error: %s\n", strerror (errno));
182 LOG (llevDebug, "Connection closed by client\n"); 388 destroy ();
183 else 389 return;
184 {
185 LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
186 }
187 return -1; /* kick this user! */
188 } 390 }
189#else
190 if (errno != EAGAIN && errno != EWOULDBLOCK)
191 {
192 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
193 }
194#endif
195 return 0; /*Error */
196 }
197 if (stat == 0)
198 return -1;
199 sl->len += stat;
200#ifdef CS_LOGSTATS
201 cst_tot.ibytes += stat;
202 cst_lst.ibytes += stat;
203#endif
204 if (stat < 2)
205 return 0; /* Still don't have a full packet */
206 }
207 /* Figure out how much more data we need to read. Add 2 from the
208 * end of this - size header information is not included.
209 */
210 toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len;
211 if ((toread + sl->len) >= len)
212 {
213 LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len);
214 /* Quick hack in case for 'oldsocketmode' input. If we are
215 * closing the socket anyways, then reading this extra 100 bytes
216 * shouldn't hurt.
217 */
218#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
219 recv (fd, sl->buf + 2, 100, 0);
220#else
221 read (fd, sl->buf + 2, 100);
222#endif /* end win32 */
223 391
224 /* return error so the socket is closed */ 392 // should not be here, normally
225 return -1;
226 }
227 do
228 {
229#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
230 stat = recv (fd, sl->buf + sl->len, toread, 0);
231#else
232 do
233 { 393 }
234 stat = read (fd, sl->buf + sl->len, toread); 394 else
235 } 395 {
236 while ((stat < 0) && (errno == EINTR)); 396 inbuf_len += amount;
237#endif 397
238 if (stat < 0) 398 cmd_ev.start ();
239 { 399 }
240
241#ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */
242 if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK)
243 {
244 if (WSAGetLastError () == WSAECONNRESET)
245 LOG (llevDebug, "Connection closed by client\n");
246 else
247 {
248 LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ());
249 }
250 return -1; /* kick this user! */
251 }
252#else
253 if (errno != EAGAIN && errno != EWOULDBLOCK)
254 {
255 LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno));
256 }
257#endif
258 return 0; /*Error */
259 }
260 if (stat == 0)
261 return -1;
262 sl->len += stat;
263#ifdef CS_LOGSTATS
264 cst_tot.ibytes += stat;
265 cst_lst.ibytes += stat;
266#endif
267 toread -= stat;
268 if (toread == 0)
269 return 1;
270 if (toread < 0)
271 {
272 LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n");
273 return 1;
274 }
275 } 400 }
276 while (toread > 0); 401}
277 return 0; 402
403// called whenever we have additional commands to process
404void
405client::cmd_cb (iw &w)
406{
407 if (handle_packet ())
408 w.start ();
409 else
410 flush ();
278} 411}
279 412
280/******************************************************************************* 413/*******************************************************************************
281 * 414 *
282 * Start of write related routines. 415 * Start of write related routines.
… …
287 * Adds data to a socket buffer for whatever reason. 420 * Adds data to a socket buffer for whatever reason.
288 * 421 *
289 * 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
290 * data, and len is the number of bytes to add. 423 * data, and len is the number of bytes to add.
291 */ 424 */
292 425void
293static void 426client::send (void *buf_, int len)
294add_to_buffer (NewSocket * ns, char *buf, int len)
295{ 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
296 int avail, end; 442 int avail, end;
297
298 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
299 {
300 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
301 ns->status = Ns_Dead;
302 return;
303 }
304 443
305 /* 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
306 * currently in use is actually data + end -1 445 * currently in use is actually data + end -1
307 */ 446 */
308
309 end = ns->outputbuffer.start + ns->outputbuffer.len; 447 end = outputbuffer.start + outputbuffer.len;
310 /* The buffer is already in a wrapped state, so adjust end */ 448 /* The buffer is already in a wrapped state, so adjust end */
311 if (end >= SOCKETBUFSIZE) 449 if (end >= SOCKETBUFSIZE)
312 end -= SOCKETBUFSIZE; 450 end -= SOCKETBUFSIZE;
451
313 avail = SOCKETBUFSIZE - end; 452 avail = SOCKETBUFSIZE - end;
314 453
315 /* We can all fit it behind the current data without wrapping */ 454 /* We can all fit it behind the current data without wrapping */
316 if (avail >= len) 455 if (avail >= len)
317 {
318 memcpy (ns->outputbuffer.data + end, buf, len); 456 memcpy (outputbuffer.data + end, buf, len);
319 }
320 else 457 else
321 { 458 {
322 memcpy (ns->outputbuffer.data + end, buf, avail); 459 memcpy (outputbuffer.data + end, buf, avail);
323 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 460 memcpy (outputbuffer.data, buf + avail, len - avail);
324 } 461 }
462
325 ns->outputbuffer.len += len; 463 outputbuffer.len += len;
326#if 0
327 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
328#endif
329} 464}
330
331/**
332 * Writes data to socket.
333 *
334 * When the socket is clear to write, and we have backlogged data, this
335 * is called to write it out.
336 */
337void
338write_socket_buffer (NewSocket * ns)
339{
340 int amt, max;
341
342 if (ns->outputbuffer.len == 0)
343 {
344 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
345 return;
346 }
347
348 do
349 {
350 max = SOCKETBUFSIZE - ns->outputbuffer.start;
351 if (ns->outputbuffer.len < max)
352 max = ns->outputbuffer.len;
353
354#ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */
355 amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0);
356#else
357 do
358 {
359 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
360 }
361 while ((amt < 0) && (errno == EINTR));
362#endif
363
364 if (amt < 0)
365 { /* We got an error */
366
367#ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */
368 if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
369 {
370 LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ());
371#else
372 if (errno != EWOULDBLOCK)
373 {
374 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
375#endif
376 ns->status = Ns_Dead;
377 return;
378 }
379 else
380 { /* EWOULDBLOCK */
381 /* can't write it, so store it away. */
382 ns->can_write = 0;
383 return;
384 }
385 }
386 ns->outputbuffer.start += amt;
387 /* wrap back to start of buffer */
388 if (ns->outputbuffer.start == SOCKETBUFSIZE)
389 ns->outputbuffer.start = 0;
390 ns->outputbuffer.len -= amt;
391#ifdef CS_LOGSTATS
392 cst_tot.obytes += amt;
393 cst_lst.obytes += amt;
394#endif
395 }
396 while (ns->outputbuffer.len > 0);
397}
398
399/**
400 * This writes data to the socket. - It is very low level -
401 * all we try and do is write out the data to the socket
402 * provided (ns). buf is the data to write, len is the number
403 * of bytes to write. IT doesn't return anything - rather, it
404 * updates the ns structure if we get an error.
405 */
406void
407Write_To_Socket (NewSocket * ns, char *buf, int len)
408{
409 int amt = 0;
410 char *pos = buf;
411
412 if (ns->status == Ns_Dead || !buf)
413 {
414 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
415 return;
416 }
417
418#ifndef __GNU__ /* This caused problems on Hurd */
419 if (!ns->can_write)
420 {
421 add_to_buffer (ns, buf, len);
422 return;
423 }
424#endif
425 /* If we manage to write more than we wanted, take it as a bonus */
426 while (len > 0)
427 {
428
429#ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */
430 amt = send (ns->fd, pos, len, 0);
431#else
432 do
433 {
434 amt = write (ns->fd, pos, len);
435 }
436 while ((amt < 0) && (errno == EINTR));
437#endif
438
439 if (amt < 0)
440 { /* We got an error */
441#ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */
442 if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK)
443 {
444 LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ());
445#else
446 if (errno != EWOULDBLOCK)
447 {
448 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
449 errno, strerror (errno));
450#endif
451 ns->status = Ns_Dead;
452 return;
453 }
454 else
455 { /* EWOULDBLOCK */
456 /* can't write it, so store it away. */
457 add_to_buffer (ns, pos, len);
458 ns->can_write = 0;
459 return;
460 }
461 }
462 /* amt gets set to 0 above in blocking code, so we do this as
463 * an else if to make sure we don't reprocess it.
464 */
465 else if (amt == 0)
466 {
467 LOG (llevError, "Write_To_Socket: No data written out.\n");
468 }
469 len -= amt;
470 pos += amt;
471#ifdef CS_LOGSTATS
472 cst_tot.obytes += amt;
473 cst_lst.obytes += amt;
474#endif
475 }
476}
477
478 465
479/** 466/**
480 * 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
481 * shortcut function. 468 * shortcut function.
482 */ 469 */
483void 470void
484cs_write_string (NewSocket * ns, const char *buf, int len) 471client::send_packet (packet &sl)
485{ 472{
486 SockList sl; 473 if (destroyed ())
487
488 sl.len = len;
489 sl.buf = (unsigned char *) buf;
490 Send_With_Handling (ns, &sl);
491}
492
493
494/**
495 * Calls Write_To_Socket to send data to the client.
496 *
497 * The only difference in this function is that we take a SockList
498 *, and we prepend the length information.
499 */
500void
501Send_With_Handling (NewSocket * ns, SockList * msg)
502{
503 unsigned char sbuf[4];
504
505 if (ns->status == Ns_Dead || !msg)
506 return; 474 return;
507 475
508 if (msg->len >= MAXSOCKBUF) 476 if (sl.length () >= MAXSOCKBUF)
509 { 477 {
510 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 ());
511 /* 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
512 * it easier to debug. 480 * it easier to debug.
513 */ 481 */
514 abort (); 482 abort ();
515 } 483 }
516 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
517 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
518 if (ns->status != Ns_Old)
519 Write_To_Socket (ns, (char *) sbuf, 2);
520 Write_To_Socket (ns, (char *) msg->buf, msg->len);
521}
522 484
523/** 485 if (!sl.length ())
524 * Takes a string of data, and writes it out to the socket. A very handy
525 * shortcut function.
526 */
527void
528Write_String_To_Socket (NewSocket * ns, char *buf, int len)
529{
530 SockList sl;
531
532 sl.len = len;
533 sl.buf = (unsigned char *) buf;
534 Send_With_Handling (ns, &sl);
535}
536
537
538/******************************************************************************
539 *
540 * statistics logging functions.
541 *
542 ******************************************************************************/
543
544#ifdef CS_LOGSTATS
545
546/* cst_tot is for the life of the server, cst_last is for the last series of
547 * stats
548 */
549CS_Stats cst_tot, cst_lst;
550
551/**
552 * Writes out the gathered stats. We clear cst_lst.
553 */
554void
555write_cs_stats (void)
556{
557 time_t now = time (NULL);
558
559 /* If no connections recently, don't both to log anything */
560 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
561 return; 486 return;
562 487
563 /* CSSTAT is put in so scripts can easily find the line */ 488 assert (sl.hdrlen == 2);
564 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", 489
565 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, 490 sl.buf_ [0] = sl.length () >> 8;
566 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); 491 sl.buf_ [1] = sl.length () ;
567 cst_lst.ibytes = 0; 492
568 cst_lst.obytes = 0; 493 send (sl.buf_, sl.length () + sl.hdrlen);
569 cst_lst.max_conn = socket_info.nconns;
570 cst_lst.time_start = now;
571} 494}
572#endif 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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