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Revision 1.4 by root, Wed Aug 30 16:30:37 2006 UTC vs.
Revision 1.46 by root, Sun Jun 10 04:44:21 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 1.4 2006/08/30 16:30:37 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 23
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
29/**
30 * \file
31 * Low-level socket-related functions.
32 *
33 * \date 2003-12-02
34 *
35 * Contains some base functions that both the client and server
36 * can use. As such, depending what we are being compiled for will
37 * determine what we can include. the client is designed have
38 * CFCLIENT defined as part of its compile flags.
39 */
40
41using namespace std; 24using namespace std;
42 25
43#include <global.h> 26#include <global.h>
44#include <newclient.h>
45#include <sproto.h> 27#include <sproto.h>
28#include <cstdarg>
46 29
47#ifdef __linux__ 30#if HAVE_TCP_INFO
48# include <sys/types.h> 31# include <sys/types.h>
49# include <sys/socket.h> 32# include <sys/socket.h>
50# include <netinet/in.h> 33# include <netinet/in.h>
51# define TCP_HZ 1000 // sorry...
52# include <netinet/tcp.h> 34# include <netinet/tcp.h>
53#endif 35#endif
54 36
55// 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
56// easily die in 20 seconds...
57#define SOCKET_TIMEOUT1 10 38#define SOCKET_TIMEOUT 8.
58#define SOCKET_TIMEOUT2 20
59 39
60void Socket_Flush (NewSocket *ns) 40// force a packet when idle for more than this many seconds,
41// forcing an ack regularly.
42#define IDLE_PING 2.
43
44void
45client::flush ()
61{ 46{
62#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 {
63 // check time of last ack, and, if too old, kill connection 54 // check time of last ack, and, if too old, kill connection
64 struct tcp_info tcpi; 55 struct tcp_info tcpi;
65 socklen_t len = sizeof (tcpi); 56 socklen_t len = sizeof (tcpi);
66 57
67 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))
68 { 59 {
69 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 60 if (tcpi.tcpi_snd_mss)
61 mss = tcpi.tcpi_snd_mss;
70 62
71 if (tcpi.tcpi_unacked 63 rtt = tcpi.tcpi_rtt;
72 && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 64 rttvar = tcpi.tcpi_rttvar;
73 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 65
66 if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
74 { 67 {
68 send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
69 write_outputbuffer ();
70
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 71 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); 72 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 ns->status = Ns_Dead; 73 destroy ();
78 } 74 }
75 }
79 } 76 }
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 77#endif
85}
86 78
87/*********************************************************************** 79 /**
88 * 80 * Writes data to socket.
89 * SockList functions/utilities 81 *
90 * 82 * When the socket is clear to write, and we have backlogged data, this
91 **********************************************************************/ 83 * is called to write it out.
92
93void SockList_Init(SockList *sl)
94{
95 sl->len=0;
96 sl->buf=NULL;
97}
98
99void SockList_AddInt(SockList *sl, uint32 data)
100{
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 */ 84 */
123int GetInt_String(unsigned char *data)
124{
125 return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]);
126}
127 85
128short GetShort_String(unsigned char *data) { 86 // write a nop to the socket at least every IDLE_NOP seconds.
129 return ((data[0]<<8)+data[1]); 87 if (!outputbuffer.len)
88 {
89 if (last_send + IDLE_PING <= NOW)
90 {
91 // this is a bit ugly, but map1/map1a seem to be the only
92 // nop'able commands and they are quite small.
93 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
94 send_packet (sl);
95 }
96 else
97 return;
98 }
99
100 if (socket_ev.poll () & PE_W)
101 return;
102
103 last_send = NOW;
104 write_outputbuffer ();
105}
106
107void
108client::write_outputbuffer ()
109{
110 while (outputbuffer.len)
111 {
112 int res = write (fd, outputbuffer.data + outputbuffer.start,
113 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
114
115 if (res > 0)
116 {
117 outputbuffer.start += res;
118 /* wrap back to start of buffer */
119 if (outputbuffer.start == SOCKETBUFSIZE)
120 outputbuffer.start = 0;
121
122 outputbuffer.len -= res;
123 }
124 else if (res == 0)
125 {
126 LOG (llevError, "socket write failed, connection closed.\n");
127 destroy ();
128 return;
129 }
130 else if (errno == EINTR)
131 {
132 // just retry
133 }
134 else if (errno == EAGAIN)
135 {
136 // delay till ready
137 socket_ev.poll (socket_ev.poll () | PE_W);
138 socket_ev.start ();
139 return;
140 }
141 else
142 {
143 LOG (llevError, "socket write failed: %s\n", strerror (errno));
144 destroy ();
145 return;
146 }
147 }
148
149 socket_ev.poll (socket_ev.poll () & ~PE_W);
130} 150}
131 151
132/****************************************************************************** 152/******************************************************************************
133 * 153 *
134 * Start of read routines. 154 * Start of read routines.
135 * 155 *
136 ******************************************************************************/ 156 ******************************************************************************/
137 157
158int
159client::next_packet ()
160{
161 if (inbuf_len >= 2)
162 {
163 int pkt_len = (inbuf [0] << 8) | inbuf [1];
164
165 if (inbuf_len >= 2 + pkt_len)
166 return 2 + pkt_len;
167
168 if (inbuf_len == sizeof (inbuf))
169 {
170 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
171 destroy ();
172 return -1;
173 }
174 }
175
176 return 0;
177}
178
179void
180client::skip_packet (int len)
181{
182 inbuf_len -= len;
183 memmove (inbuf, inbuf + len, inbuf_len);
184}
185
186/*****************************************************************************
187 * Start of command dispatch area.
188 * The commands here are protocol commands.
189 ****************************************************************************/
190
191// SocketCommand, PlayingCommand, should not exist with those ugly casts
192#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
193#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
194
138/** 195/**
139 * This reads from fd and puts the data in sl. We return true if we think 196 * Dispatch table for the server.
140 * we have a full packet, 0 if we have a partial packet. The only processing
141 * we do is remove the intial size value. len (As passed) is the size of the
142 * buffer allocated in the socklist. We make the assumption the buffer is
143 * at least 2 bytes long.
144 */ 197 */
145 198static struct packet_type packets[] = {
146int SockList_ReadPacket(int fd, SockList *sl, int len) 199 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
147{ 200 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
148 int stat,toread;
149 201
150 /* Sanity check - shouldn't happen */ 202 {"examine", PC(ExamineCmd) PF_PLAYING },
151 if (sl->len < 0) { 203 {"ex", PC(ExCmd) PF_PLAYING },
152 abort(); 204 {"apply", PC(ApplyCmd) PF_PLAYING },
205 {"lookat", PC(LookAt) PF_PLAYING },
206 {"lock", PC(LockItem) PF_PLAYING },
207 {"mark", PC(MarkItem) PF_PLAYING },
208 {"move", PC(MoveCmd) PF_PLAYING },
209 {"ext", PC(ExtCmd) 0 }, // CF+
210 {"mapredraw", PC(MapRedrawCmd) 0 },
211 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
212
213 {"reply", SC(ReplyCmd) 0 },
214 {"exti", SC(ExtiCmd) 0 }, // CF+
215 {"addme", SC(AddMeCmd) 0 },
216 {"askface", SC(AskFaceCmd) 0 },
217 {"requestinfo", SC(RequestInfo) 0 },
218 {"setfacemode", SC(SetFaceMode) 0 },
219 {"setsound", SC(SetSound) 0 },
220 {"setup", SC(SetUp) 0 },
221 {"version", SC(VersionCmd) 0 },
222 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
223 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
224 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
225};
226
227bool
228client::may_execute (const packet_type *pkt) const
229{
230 return (!(pkt->flags & PF_PLAYER) || pl)
231 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
232}
233
234// HACK: some commands currently should be executed
235// even when the player is frozen. this hack detects
236// those commands. it should be folded into may_execute,
237// but kept seperate to emphasise the hack aspect, i.e.
238// do it better, then remove.
239static bool
240always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
241{
242 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
243 return false;
244
245 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
246 return false;
247
248 if (pkt->flags & PF_COMMAND6)
249 {
250 data += 6;
251 len -= 6;
252 }
253
254 if (len > 4 && !strncmp (data, "say " , 4))
255 return true;
256 if (len > 5 && !strncmp (data, "chat ", 5))
257 return true;
258
259 return false;
260}
261
262void
263client::execute (const packet_type *pkt, char *data, int datalen)
264{
265 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
266 {
267 //TODO: only one format
268 if (pkt->flags & PF_PLAYER)
269 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
270 else
271 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
272 }
273 else
274 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
275}
276
277bool
278client::handle_packet ()
279{
280 int pkt_len = next_packet ();
281
282 if (!pkt_len)
283 return false;
284 else if (pkt_len < 0)
285 {
286 LOG (llevError, "read error on player %s\n",
287 pl && pl->ob ? &pl->ob->name : "[anonymous]");
288 destroy ();
289 return false;
290 }
291
292 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
293
294 /* First, break out beginning word. There are at least
295 * a few commands that do not have any paremeters. If
296 * we get such a command, don't worry about trying
297 * to break it up.
298 */
299 int datalen;
300 char *data = strchr ((char *)inbuf + 2, ' ');
301
302 if (data)
303 {
304 *data++ = 0;
305 datalen = pkt_len - (data - (char *)inbuf);
306 }
307 else
308 {
309 data = (char *)inbuf + 2; // better read garbage than segfault
310 datalen = 0;
311 }
312
313 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
314 if (!strcmp ((char *)inbuf + 2, pkt->name))
315 {
316 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
317 queue_command (pkt, data, datalen);
318 else
319 execute (pkt, data, datalen);
320
321 goto next_packet;
153 } 322 }
154 /* We already have a partial packet */
155 if (sl->len<2) {
156#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
157 323
158 stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); 324 // If we get here, we didn't find a valid command.
325 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
326next_packet:
327 skip_packet (pkt_len);
159 328
160#else 329 // input buffer has space again
330 socket_ev.poll (socket_ev.poll () | PE_R);
331
332 return true;
333}
334
335// callback called when socket is either readable or writable
336void
337client::socket_cb (iow &w, int got)
338{
339 //TODO remove when we have better socket cleanup logic
340 if (destroyed ())
341 {
342 socket_ev.poll (0);
343 return;
344 }
345
346 if (got & PE_W)
347 {
348 write_outputbuffer ();
349
350 if (!outputbuffer.len)
351 socket_ev.poll (socket_ev.poll () & ~PE_W);
352 }
353
354 if (got & PE_R)
355 {
356 //TODO: rate-limit tcp connection in better ways, important
357
358 int amount = sizeof (inbuf) - inbuf_len;
359
360 if (!amount)
161 do { 361 {
162 stat=read(fd, sl->buf + sl->len, 2-sl->len); 362 // input buffer full
163 } while ((stat==-1) && (errno==EINTR)); 363 socket_ev.poll (socket_ev.poll () & ~PE_R);
164#endif 364 return;
165 if (stat<0) { 365 }
166 /* In non blocking mode, EAGAIN is set when there is no 366
167 * data available. 367 amount = read (fd, inbuf + inbuf_len, amount);
168 */ 368
169#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 369 if (!amount)
170 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { 370 {
171 if(WSAGetLastError() == WSAECONNRESET) 371 destroy ();
172 LOG(llevDebug,"Connection closed by client\n"); 372 return;
173 else 373 }
374 else if (amount < 0)
375 {
376 if (errno != EAGAIN && errno != EINTR)
174 { 377 {
175 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); 378 LOG (llevError, "read error: %s\n", strerror (errno));
176 } 379 destroy ();
177 return -1; /* kick this user! */ 380 return;
178 } 381 }
179#else 382
180 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 383 // should not be here, normally
181 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror(errno));
182 } 384 }
183#endif 385 else
184 return 0; /*Error */
185 } 386 {
186 if (stat==0) return -1; 387 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 */
210 388
211 /* return error so the socket is closed */ 389 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 } 390 }
234#else 391 }
235 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 392}
236 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror(errno)); 393
237 } 394// called whenever we have additional commands to process
238#endif 395void
239 return 0; /*Error */ 396client::cmd_cb (iw &w)
240 } 397{
241 if (stat==0) return -1; 398 if (handle_packet ())
242 sl->len += stat; 399 w.start ();
243#ifdef CS_LOGSTATS 400 else
244 cst_tot.ibytes += stat; 401 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} 402}
256 403
257/******************************************************************************* 404/*******************************************************************************
258 * 405 *
259 * Start of write related routines. 406 * Start of write related routines.
264 * Adds data to a socket buffer for whatever reason. 411 * Adds data to a socket buffer for whatever reason.
265 * 412 *
266 * ns is the socket we are adding the data to, buf is the start of the 413 * 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. 414 * data, and len is the number of bytes to add.
268 */ 415 */
269 416void
270static void add_to_buffer(NewSocket *ns, char *buf, int len) 417client::send (void *buf_, int len)
271{ 418{
419 char *buf = (char *)buf_;
420
421 if (destroyed () || !buf)
422 return;
423
424 if (len + outputbuffer.len > SOCKETBUFSIZE)
425 {
426 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
427 // shutdown the socket, this is safer than destroying it immediately
428 // as lots of code in the callchain might still access the map etc.
429 shutdown (fd, SHUT_RDWR);
430 return;
431 }
432
272 int avail, end; 433 int avail, end;
273 434
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 435 /* data + end is where we start putting the new data. The last byte
282 * currently in use is actually data + end -1 436 * currently in use is actually data + end -1
283 */ 437 */
284
285 end=ns->outputbuffer.start + ns->outputbuffer.len; 438 end = outputbuffer.start + outputbuffer.len;
286 /* The buffer is already in a wrapped state, so adjust end */ 439 /* The buffer is already in a wrapped state, so adjust end */
287 if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; 440 if (end >= SOCKETBUFSIZE)
441 end -= SOCKETBUFSIZE;
442
288 avail=SOCKETBUFSIZE - end; 443 avail = SOCKETBUFSIZE - end;
289 444
290 /* We can all fit it behind the current data without wrapping */ 445 /* We can all fit it behind the current data without wrapping */
291 if (avail >=len ) { 446 if (avail >= len)
292 memcpy(ns->outputbuffer.data + end, buf, len); 447 memcpy (outputbuffer.data + end, buf, len);
448 else
293 } 449 {
294 else {
295 memcpy(ns->outputbuffer.data + end, buf, avail); 450 memcpy (outputbuffer.data + end, buf, avail);
296 memcpy(ns->outputbuffer.data, buf+avail, len-avail); 451 memcpy (outputbuffer.data, buf + avail, len - avail);
297 } 452 }
453
298 ns->outputbuffer.len += len; 454 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} 455}
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(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(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
431 456
432/** 457/**
433 * Takes a string of data, and writes it out to the socket. A very handy 458 * Takes a string of data, and writes it out to the socket. A very handy
434 * shortcut function. 459 * shortcut function.
435 */ 460 */
436void cs_write_string(NewSocket *ns, const char *buf, int len) 461void
462client::send_packet (packet &sl)
437{ 463{
438 SockList sl; 464 if (destroyed ())
465 return;
439 466
440 sl.len = len; 467 if (sl.length () >= MAXSOCKBUF)
441 sl.buf = (unsigned char*)buf; 468 {
442 Send_With_Handling(ns, &sl); 469 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
443} 470 /* Almost certainly we've overflowed a buffer, so quit now to make
471 * it easier to debug.
472 */
473 abort ();
474 }
444 475
476 if (!sl.length ())
477 return;
445 478
446/** 479 assert (sl.hdrlen == 2);
447 * Calls Write_To_Socket to send data to the client. 480
481 sl.buf_ [0] = sl.length () >> 8;
482 sl.buf_ [1] = sl.length () ;
483
484 send (sl.buf_, sl.length () + sl.hdrlen);
485}
486
487void
488client::send_packet (const char *buf, int len)
489{
490 packet sl;
491
492 sl << data (buf, len);
493 send_packet (sl);
494}
495
496void
497client::send_packet (const char *buf)
498{
499 send_packet (buf, strlen (buf));
500}
501
502void
503client::send_packet_printf (const char *format, ...)
504{
505 packet sl;
506
507 va_list ap;
508 va_start (ap, format);
509 sl.vprintf (format, ap);
510 va_end (ap);
511
512 send_packet (sl);
513}
514
515void
516client::send_drawinfo (const char *msg, int flags)
517{
518 send_packet_printf ("drawinfo %d %s", flags, msg);
519}
520
521void
522client::send_msg (int color, const char *type, const char *msg)
523{
524 if (can_msg)
525 send_packet_printf ("msg %d %s %s", color, type, msg);
526 else if (color < 0)
527 return; // client cannot handle this
528 else if (strchr (msg, '<') || strchr (msg, '&'))
529 {
530 //TODO: should escape/modify to old syntax
531 send_packet_printf ("drawinfo %d %s", color, msg);
532 }
533 else
534 send_packet_printf ("drawinfo %d %s", color, msg);
535}
536
537/***********************************************************************
448 * 538 *
449 * The only difference in this function is that we take a SockList 539 * packet functions/utilities
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;
458
459 if (msg->len >= MAXSOCKBUF) {
460 LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n",
461 msg->len);
462 /* Almost certainly we've overflowed a buffer, so quite now to make
463 * it easier to debug.
464 */
465 abort();
466 }
467 sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF;
468 sbuf[1] = ((uint32)(msg->len)) & 0xFF;
469 if (ns->status != Ns_Old)
470 Write_To_Socket(ns, (char *) sbuf, 2);
471 Write_To_Socket(ns, (char*)msg->buf, msg->len);
472}
473
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/******************************************************************************
489 * 540 *
490 * statistics logging functions.
491 *
492 ******************************************************************************/ 541 **********************************************************************/
493 542
494#ifdef CS_LOGSTATS 543packet::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{ 544{
505 time_t now=time(NULL); 545 reset ();
506 546
507 /* If no connections recently, don't both to log anything */ 547 int len = strlen (name);
508 if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; 548 memcpy (cur, name, len); cur += len;
509 549 *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} 550}
520#endif 551
552packet &packet::operator <<(const ber32 v)
553{
554 enum { maxlen = 32 / 7 + 1};
555 uint8 buf[maxlen];
556 uint8 *p = buf + maxlen;
557 uint32 val = v.val;
558
559 *--p = val & 0x7F;
560
561 while (val > 0x7F)
562 {
563 val >>= 7;
564 *--p = (val & 0x7F) | 0x80;
565 }
566
567 return *this << data (p, buf + maxlen - p);
568}
569
570packet &packet::operator <<(const data &v)
571{
572 if (room () < v.len)
573 reset ();
574 else
575 {
576 if (v.len)
577 {
578 memcpy (cur, v.ptr, v.len);
579 cur += v.len;
580 }
581 }
582
583 return *this;
584}
585
586packet &packet::operator <<(const data8 &v)
587{
588 unsigned int len = min (v.len, 0x00FF);
589 return *this << uint8 (len) << data (v.ptr, len);
590}
591
592packet &packet::operator <<(const data16 &v)
593{
594 unsigned int len = min (v.len, 0xFFFF);
595 return *this << uint16 (len) << data (v.ptr, len);
596}
597
598packet &packet::operator <<(const char *v)
599{
600 return *this << data (v, strlen (v ? v : 0));
601}
602
603void
604packet::vprintf (const char *format, va_list ap)
605{
606 int size = room ();
607
608 int len = vsnprintf ((char *)cur, size, format, ap);
609
610 if (len >= size)
611 return reset ();
612
613 cur += len;
614}
615

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