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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.3 by root, Tue Aug 29 08:01:38 2006 UTC vs.
Revision 1.44 by root, Sat Jun 9 22:54:28 2007 UTC

1
2/* 1/*
3 * static char *rcsid_sockets_c = 2 * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
4 * "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 root Exp $"; 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5 * Copyright (©) 1992,2007 Frank Tore Johansen
6 *
7 * Crossfire TRT is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the Free
9 * Software Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
19 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 * The authors can be reached via e-mail to <crossfire@schmorp.de>
5 */ 22 */
6
7/*
8 CrossFire, A Multiplayer game for X-windows
9
10 Copyright (C) 1992 Frank Tore Johansen
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26 The author can be reached via e-mail to mark@pyramid.com
27*/
28 23
29/** 24/**
30 * \file 25 * \file
31 * Low-level socket-related functions. 26 * Low-level socket-related functions.
32 * 27 *
39 */ 34 */
40 35
41using namespace std; 36using namespace std;
42 37
43#include <global.h> 38#include <global.h>
44#include <newclient.h>
45#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg>
46 41
47#ifdef __linux__ 42#ifdef __linux__
48# include <sys/types.h> 43# include <sys/types.h>
49# include <sys/socket.h> 44# include <sys/socket.h>
50# include <netinet/in.h> 45# include <netinet/in.h>
51# define TCP_HZ 1000 // sorry...
52# include <netinet/tcp.h> 46# include <netinet/tcp.h>
53#endif 47#endif
54 48
55// 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
56// easily die in 20 seconds...
57#define SOCKET_TIMEOUT1 10 50#define SOCKET_TIMEOUT 8.
58#define SOCKET_TIMEOUT2 20
59 51
60void Socket_Flush (NewSocket *ns) 52// force a packet when idle for more than this many seconds,
53// forcing an ack regularly.
54#define IDLE_PING 2.
55
56void
57client::flush ()
61{ 58{
62#ifdef __linux__ 59 if (destroyed ())
60 return;
61
62#ifdef __linux__ //TODO: this is available on bsds, too, use a configure test.
63 // check about once per second, spread evenly over all clients
64 if (!((pticks + fd) & 7))
65 {
63 // check time of last ack, and, if too old, kill connection 66 // check time of last ack, and, if too old, kill connection
64 struct tcp_info tcpi; 67 struct tcp_info tcpi;
65 socklen_t len = sizeof (tcpi); 68 socklen_t len = sizeof (tcpi);
66 69
67 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))
68 { 71 {
69 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 72 rtt = tcpi.tcpi_rtt;
73 rttvar = tcpi.tcpi_rttvar;
70 74
71 if (tcpi.tcpi_unacked 75 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
72 && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
73 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 76 {
77 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
78 write_outputbuffer ();
79
75 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,
76 (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);
77 ns->status = Ns_Dead; 82 destroy ();
78 } 83 }
84 }
79 } 85 }
80
81 int val;
82 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
83 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val));
84#endif 86#endif
85}
86 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
87/*********************************************************************** 195/*****************************************************************************
88 * 196 * Start of command dispatch area.
89 * SockList functions/utilities 197 * The commands here are protocol commands.
90 *
91 **********************************************************************/ 198 ****************************************************************************/
92 199
93void SockList_Init(SockList *sl) 200// SocketCommand, PlayingCommand, should not exist with those ugly casts
94{ 201#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
95 sl->len=0; 202#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
96 sl->buf=NULL;
97}
98 203
99void SockList_AddInt(SockList *sl, uint32 data) 204/**
100{ 205 * Dispatch table for the server.
101 sl->buf[sl->len++]= (data>>24)&0xff;
102 sl->buf[sl->len++]= (data>>16)&0xff;
103 sl->buf[sl->len++]= (data>>8)&0xff;
104 sl->buf[sl->len++] = data & 0xff;
105}
106
107void SockList_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 GetInt_String(unsigned char *data) 207static struct packet_type packets[] = {
124{ 208 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
125 return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); 209 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
126}
127 210
128short GetShort_String(unsigned char *data) { 211 {"examine", PC(ExamineCmd) PF_PLAYING },
129 return ((data[0]<<8)+data[1]); 212 {"ex", PC(ExCmd) PF_PLAYING },
130} 213 {"apply", PC(ApplyCmd) PF_PLAYING },
214 {"lookat", PC(LookAt) PF_PLAYING },
215 {"lock", PC(LockItem) PF_PLAYING },
216 {"mark", PC(MarkItem) PF_PLAYING },
217 {"move", PC(MoveCmd) PF_PLAYING },
218 {"ext", PC(ExtCmd) 0 }, // CF+
219 {"mapredraw", PC(MapRedrawCmd) 0 },
220 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
131 221
132/****************************************************************************** 222 {"reply", SC(ReplyCmd) 0 },
133 * 223 {"exti", SC(ExtiCmd) 0 }, // CF+
134 * Start of read routines. 224 {"addme", SC(AddMeCmd) 0 },
135 * 225 {"askface", SC(AskFaceCmd) 0 },
136 ******************************************************************************/ 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};
137 235
138/** 236bool
139 * This reads from fd and puts the data in sl. We return true if we think 237client::may_execute (const packet_type *pkt) const
140 * we have a full packet, 0 if we have a partial packet. The only processing 238{
141 * we do is remove the intial size value. len (As passed) is the size of the 239 return (!(pkt->flags & PF_PLAYER) || pl)
142 * buffer allocated in the socklist. We make the assumption the buffer is 240 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
143 * at least 2 bytes long. 241}
242
243// HACK: some commands currently should be executed
244// even when the player is frozen. this hack detects
245// those commands. it should be folded into may_execute,
246// but kept seperate to emphasise the hack aspect, i.e.
247// do it better, then remove.
248static bool
249always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
250{
251 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
252 return false;
253
254 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
255 return false;
256
257 if (pkt->flags & PF_COMMAND6)
258 {
259 data += 6;
260 len -= 6;
261 }
262
263 if (len > 4 && !strncmp (data, "say " , 4))
264 return true;
265 if (len > 5 && !strncmp (data, "chat ", 5))
266 return true;
267
268 return false;
269}
270
271void
272client::execute (const packet_type *pkt, char *data, int datalen)
273{
274 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
275 {
276 //TODO: only one format
277 if (pkt->flags & PF_PLAYER)
278 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
279 else
280 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
281 }
282 else
283 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
284}
285
286bool
287client::handle_packet ()
288{
289 int pkt_len = next_packet ();
290
291 if (!pkt_len)
292 return false;
293 else if (pkt_len < 0)
294 {
295 LOG (llevError, "read error on player %s\n",
296 pl && pl->ob ? &pl->ob->name : "[anonymous]");
297 destroy ();
298 return false;
299 }
300
301 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
302
303 /* First, break out beginning word. There are at least
304 * a few commands that do not have any paremeters. If
305 * we get such a command, don't worry about trying
306 * to break it up.
144 */ 307 */
145 308 int datalen;
146int SockList_ReadPacket(int fd, SockList *sl, int len) 309 char *data = strchr ((char *)inbuf + 2, ' ');
147{
148 int stat,toread;
149 310
150 /* Sanity check - shouldn't happen */ 311 if (data)
151 if (sl->len < 0) { 312 {
152 abort(); 313 *data++ = 0;
314 datalen = pkt_len - (data - (char *)inbuf);
315 }
316 else
317 {
318 data = (char *)inbuf + 2; // better read garbage than segfault
319 datalen = 0;
320 }
321
322 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
323 if (!strcmp ((char *)inbuf + 2, pkt->name))
324 {
325 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
326 queue_command (pkt, data, datalen);
327 else
328 execute (pkt, data, datalen);
329
330 goto next_packet;
153 } 331 }
154 /* We already have a partial packet */
155 if (sl->len<2) {
156#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
157 332
158 stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); 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);
159 337
160#else 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)
161 do { 370 {
162 stat=read(fd, sl->buf + sl->len, 2-sl->len); 371 // input buffer full
163 } while ((stat==-1) && (errno==EINTR)); 372 socket_ev.poll (socket_ev.poll () & ~PE_R);
164#endif 373 return;
165 if (stat<0) { 374 }
166 /* In non blocking mode, EAGAIN is set when there is no 375
167 * data available. 376 amount = read (fd, inbuf + inbuf_len, amount);
168 */ 377
169#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 378 if (!amount)
170 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { 379 {
171 if(WSAGetLastError() == WSAECONNRESET) 380 destroy ();
172 LOG(llevDebug,"Connection closed by client\n"); 381 return;
173 else 382 }
383 else if (amount < 0)
384 {
385 if (errno != EAGAIN && errno != EINTR)
174 { 386 {
175 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); 387 LOG (llevError, "read error: %s\n", strerror (errno));
176 } 388 destroy ();
177 return -1; /* kick this user! */ 389 return;
178 } 390 }
179#else 391
180 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 392 // should not be here, normally
181 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182 } 393 }
183#endif 394 else
184 return 0; /*Error */
185 } 395 {
186 if (stat==0) return -1; 396 inbuf_len += amount;
187 sl->len += stat;
188#ifdef CS_LOGSTATS
189 cst_tot.ibytes += stat;
190 cst_lst.ibytes += stat;
191#endif
192 if (stat<2) return 0; /* Still don't have a full packet */
193 }
194 /* Figure out how much more data we need to read. Add 2 from the
195 * end of this - size header information is not included.
196 */
197 toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len;
198 if ((toread + sl->len) >= len) {
199 LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
200 toread + sl->len, len);
201 /* Quick hack in case for 'oldsocketmode' input. If we are
202 * closing the socket anyways, then reading this extra 100 bytes
203 * shouldn't hurt.
204 */
205#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
206 recv(fd, sl->buf+2, 100, 0);
207#else
208 read(fd, sl->buf+2, 100);
209#endif /* end win32 */
210 397
211 /* return error so the socket is closed */ 398 cmd_ev.start ();
212 return -1;
213 }
214 do {
215#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
216 stat = recv(fd, sl->buf+ sl->len, toread, 0);
217#else
218 do {
219 stat = read(fd, sl->buf+ sl->len, toread);
220 } while ((stat<0) && (errno==EINTR));
221#endif
222 if (stat<0) {
223
224#ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */
225 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
226 if(WSAGetLastError() == WSAECONNRESET)
227 LOG(llevDebug,"Connection closed by client\n");
228 else
229 {
230 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
231 }
232 return -1; /* kick this user! */
233 } 399 }
234#else 400 }
235 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 401}
236 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); 402
237 } 403// called whenever we have additional commands to process
238#endif 404void
239 return 0; /*Error */ 405client::cmd_cb (iw &w)
240 } 406{
241 if (stat==0) return -1; 407 if (handle_packet ())
242 sl->len += stat; 408 w.start ();
243#ifdef CS_LOGSTATS 409 else
244 cst_tot.ibytes += stat; 410 flush ();
245 cst_lst.ibytes += stat;
246#endif
247 toread -= stat;
248 if (toread==0) return 1;
249 if (toread < 0) {
250 LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n");
251 return 1;
252 }
253 } while (toread>0);
254 return 0;
255} 411}
256 412
257/******************************************************************************* 413/*******************************************************************************
258 * 414 *
259 * Start of write related routines. 415 * Start of write related routines.
264 * Adds data to a socket buffer for whatever reason. 420 * Adds data to a socket buffer for whatever reason.
265 * 421 *
266 * 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
267 * data, and len is the number of bytes to add. 423 * data, and len is the number of bytes to add.
268 */ 424 */
269 425void
270static void add_to_buffer(NewSocket *ns, char *buf, int len) 426client::send (void *buf_, int len)
271{ 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
272 int avail, end; 442 int avail, end;
273 443
274 if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
275 LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
276 ns->fd);
277 ns->status = Ns_Dead;
278 return;
279 }
280
281 /* 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
282 * currently in use is actually data + end -1 445 * currently in use is actually data + end -1
283 */ 446 */
284
285 end=ns->outputbuffer.start + ns->outputbuffer.len; 447 end = outputbuffer.start + outputbuffer.len;
286 /* The buffer is already in a wrapped state, so adjust end */ 448 /* The buffer is already in a wrapped state, so adjust end */
287 if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; 449 if (end >= SOCKETBUFSIZE)
450 end -= SOCKETBUFSIZE;
451
288 avail=SOCKETBUFSIZE - end; 452 avail = SOCKETBUFSIZE - end;
289 453
290 /* We can all fit it behind the current data without wrapping */ 454 /* We can all fit it behind the current data without wrapping */
291 if (avail >=len ) { 455 if (avail >= len)
292 memcpy(ns->outputbuffer.data + end, buf, len); 456 memcpy (outputbuffer.data + end, buf, len);
457 else
293 } 458 {
294 else {
295 memcpy(ns->outputbuffer.data + end, buf, avail); 459 memcpy (outputbuffer.data + end, buf, avail);
296 memcpy(ns->outputbuffer.data, buf+avail, len-avail); 460 memcpy (outputbuffer.data, buf + avail, len - avail);
297 } 461 }
462
298 ns->outputbuffer.len += len; 463 outputbuffer.len += len;
299#if 0
300 LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
301 ns->outputbuffer.len, ns->outputbuffer.start);
302#endif
303} 464}
304
305/**
306 * Writes data to socket.
307 *
308 * When the socket is clear to write, and we have backlogged data, this
309 * is called to write it out.
310 */
311void write_socket_buffer(NewSocket *ns)
312{
313 int amt, max;
314
315 if (ns->outputbuffer.len==0) {
316 LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
317 ns->fd);
318 return;
319 }
320
321 do {
322 max = SOCKETBUFSIZE - ns->outputbuffer.start;
323 if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
324
325#ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */
326 amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
327#else
328 do {
329 amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
330 } while ((amt<0) && (errno==EINTR));
331#endif
332
333 if (amt < 0) { /* We got an error */
334
335#ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */
336 if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
337 LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
338#else
339 if (errno !=EWOULDBLOCK) {
340 LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
341 errno, strerror_local(errno));
342#endif
343 ns->status=Ns_Dead;
344 return;
345 }
346 else { /* EWOULDBLOCK */
347 /* can't write it, so store it away. */
348 ns->can_write=0;
349 return;
350 }
351 }
352 ns->outputbuffer.start += amt;
353 /* wrap back to start of buffer */
354 if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
355 ns->outputbuffer.len -= amt;
356#ifdef CS_LOGSTATS
357 cst_tot.obytes += amt;
358 cst_lst.obytes += amt;
359 #endif
360 } while (ns->outputbuffer.len>0);
361}
362
363/**
364 * This writes data to the socket. - It is very low level -
365 * all we try and do is write out the data to the socket
366 * provided (ns). buf is the data to write, len is the number
367 * of bytes to write. IT doesn't return anything - rather, it
368 * updates the ns structure if we get an error.
369 */
370void Write_To_Socket(NewSocket *ns, char *buf, int len)
371{
372 int amt=0;
373 char *pos=buf;
374
375 if (ns->status == Ns_Dead || !buf) {
376 LOG(llevDebug,"Write_To_Socket called with dead socket\n");
377 return;
378 }
379
380#ifndef __GNU__ /* This caused problems on Hurd */
381 if (!ns->can_write) {
382 add_to_buffer(ns, buf, len);
383 return;
384 }
385#endif
386 /* If we manage to write more than we wanted, take it as a bonus */
387 while (len>0) {
388
389#ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */
390 amt=send(ns->fd, pos, len,0);
391#else
392 do {
393 amt=write(ns->fd, pos, len);
394 } while ((amt<0) && (errno==EINTR));
395#endif
396
397 if (amt < 0) { /* We got an error */
398#ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */
399 if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
400 LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
401#else
402 if (errno !=EWOULDBLOCK) {
403 LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
404 errno, strerror_local(errno));
405#endif
406 ns->status=Ns_Dead;
407 return;
408 }
409 else { /* EWOULDBLOCK */
410 /* can't write it, so store it away. */
411 add_to_buffer(ns, pos, len);
412 ns->can_write=0;
413 return;
414 }
415 }
416 /* amt gets set to 0 above in blocking code, so we do this as
417 * an else if to make sure we don't reprocess it.
418 */
419 else if (amt==0) {
420 LOG(llevError,"Write_To_Socket: No data written out.\n");
421 }
422 len -= amt;
423 pos += amt;
424#ifdef CS_LOGSTATS
425 cst_tot.obytes += amt;
426 cst_lst.obytes += amt;
427 #endif
428 }
429}
430
431 465
432/** 466/**
433 * 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
434 * shortcut function. 468 * shortcut function.
435 */ 469 */
436void cs_write_string(NewSocket *ns, const char *buf, int len) 470void
471client::send_packet (packet &sl)
437{ 472{
438 SockList sl; 473 if (destroyed ())
439
440 sl.len = len;
441 sl.buf = (unsigned char*)buf;
442 Send_With_Handling(ns, &sl);
443}
444
445
446/**
447 * Calls Write_To_Socket to send data to the client.
448 *
449 * The only difference in this function is that we take a SockList
450 *, and we prepend the length information.
451 */
452void Send_With_Handling(NewSocket *ns,SockList *msg)
453{
454 unsigned char sbuf[4];
455
456 if (ns->status == Ns_Dead || !msg)
457 return; 474 return;
458 475
459 if (msg->len >= MAXSOCKBUF) { 476 if (sl.length () >= MAXSOCKBUF)
477 {
460 LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", 478 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
461 msg->len);
462 /* 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
463 * it easier to debug. 480 * it easier to debug.
464 */ 481 */
465 abort(); 482 abort ();
483 }
484
485 if (!sl.length ())
486 return;
487
488 assert (sl.hdrlen == 2);
489
490 sl.buf_ [0] = sl.length () >> 8;
491 sl.buf_ [1] = sl.length () ;
492
493 send (sl.buf_, sl.length () + sl.hdrlen);
494}
495
496void
497client::send_packet (const char *buf, int len)
498{
499 packet sl;
500
501 sl << data (buf, len);
502 send_packet (sl);
503}
504
505void
506client::send_packet (const char *buf)
507{
508 send_packet (buf, strlen (buf));
509}
510
511void
512client::send_packet_printf (const char *format, ...)
513{
514 packet sl;
515
516 va_list ap;
517 va_start (ap, format);
518 sl.vprintf (format, ap);
519 va_end (ap);
520
521 send_packet (sl);
522}
523
524void
525client::send_drawinfo (const char *msg, int flags)
526{
527 send_packet_printf ("drawinfo %d %s", flags, msg);
528}
529
530void
531client::send_msg (int color, const char *type, const char *msg)
532{
533 if (can_msg)
534 send_packet_printf ("msg %d %s %s", color, type, msg);
535 else if (color < 0)
536 return; // client cannot handle this
537 else if (strchr (msg, '<') || strchr (msg, '&'))
466 } 538 {
467 sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; 539 //TODO: should escape/modify to old syntax
468 sbuf[1] = ((uint32)(msg->len)) & 0xFF; 540 send_packet_printf ("drawinfo %d %s", color, msg);
469 if (ns->status != Ns_Old) 541 }
470 Write_To_Socket(ns, (char *) sbuf, 2); 542 else
471 Write_To_Socket(ns, (char*)msg->buf, msg->len); 543 send_packet_printf ("drawinfo %d %s", color, msg);
472} 544}
473 545
474/**
475 * Takes a string of data, and writes it out to the socket. A very handy
476 * shortcut function.
477 */
478void Write_String_To_Socket(NewSocket *ns, char *buf, int len)
479{
480 SockList sl;
481
482 sl.len = len;
483 sl.buf = (unsigned char*) buf;
484 Send_With_Handling(ns, &sl);
485}
486
487
488/****************************************************************************** 546/***********************************************************************
489 * 547 *
490 * statistics logging functions. 548 * packet functions/utilities
491 * 549 *
492 ******************************************************************************/ 550 **********************************************************************/
493 551
494#ifdef CS_LOGSTATS 552packet::packet (const char *name)
495/* cst_tot is for the life of the server, cst_last is for the last series of
496 * stats
497 */
498CS_Stats cst_tot, cst_lst;
499
500/**
501 * Writes out the gathered stats. We clear cst_lst.
502 */
503void write_cs_stats(void)
504{ 553{
505 time_t now=time(NULL); 554 reset ();
506 555
507 /* If no connections recently, don't both to log anything */ 556 int len = strlen (name);
508 if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; 557 memcpy (cur, name, len); cur += len;
509 558 *cur++ = ' ';
510 /* CSSTAT is put in so scripts can easily find the line */
511 LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
512 ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
513 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
514 cst_lst.max_conn, now - cst_lst.time_start);
515 cst_lst.ibytes=0;
516 cst_lst.obytes=0;
517 cst_lst.max_conn=socket_info.nconns;
518 cst_lst.time_start=now;
519} 559}
520#endif 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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