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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 1.41 by root, Fri May 18 19:46:22 2007 UTC

1
2/* 1/*
3 * static char *rcsid_sockets_c = 2 * CrossFire, A Multiplayer game
4 * "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 root Exp $"; 3 *
4 * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
5 * Copyright (C) 1992 Frank Tore Johansen
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * The author can be reached via e-mail to mark@pyramid.com
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/** 24/**
30 * \file 25 * \file
31 * Low-level socket-related functions. 26 * Low-level socket-related functions.
32 * 27 *
33 * \date 2003-12-02 28 * \date 2003-12-02
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// use a really low timeout, as it doesn't cost any bandwidth, and you can
56// easily die in 20 seconds... 50// easily die in 20 seconds...
57#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10 * 1000
58#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20 * 1000
59 53
60void Socket_Flush (NewSocket *ns) 54void
55client::flush ()
61{ 56{
57 if (destroyed ())
58 return;
59
62#ifdef __linux__ 60#ifdef __linux__
63 // check time of last ack, and, if too old, kill connection 61 // check time of last ack, and, if too old, kill connection
64 struct tcp_info tcpi; 62 struct tcp_info tcpi;
65 socklen_t len = sizeof (tcpi); 63 socklen_t len = sizeof (tcpi);
66 64
67 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
68 { 66 {
69 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
70 68
71 if (tcpi.tcpi_unacked 69 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar;
71
72 && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
73 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
74 { 74 {
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 75 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); 76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
77 ns->status = Ns_Dead; 77 destroy ();
78 } 78 }
79 } 79 }
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 80#endif
85}
86 81
82 /**
83 * Writes data to socket.
84 *
85 * When the socket is clear to write, and we have backlogged data, this
86 * is called to write it out.
87 */
88
89 if (!outputbuffer.len || socket_ev.poll () & PE_W)
90 return;
91
92 write_outputbuffer ();
93}
94
95void
96client::write_outputbuffer ()
97{
98 while (outputbuffer.len)
99 {
100 int res = write (fd, outputbuffer.data + outputbuffer.start,
101 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
102
103 if (res > 0)
104 {
105 outputbuffer.start += res;
106 /* wrap back to start of buffer */
107 if (outputbuffer.start == SOCKETBUFSIZE)
108 outputbuffer.start = 0;
109
110 outputbuffer.len -= res;
111#ifdef CS_LOGSTATS
112 cst_tot.obytes += res;
113 cst_lst.obytes += res;
114#endif
115 }
116 else if (res == 0)
117 {
118 LOG (llevError, "socket write failed, connection closed.\n");
119 destroy ();
120 return;
121 }
122 else if (errno == EINTR)
123 {
124 // just retry
125 }
126 else if (errno == EAGAIN)
127 {
128 // delay till ready
129 socket_ev.poll (socket_ev.poll () | PE_W);
130 socket_ev.start ();
131 return;
132 }
133 else
134 {
135 LOG (llevError, "socket write failed: %s\n", strerror (errno));
136 destroy ();
137 return;
138 }
139 }
140
141 socket_ev.poll (socket_ev.poll () & ~PE_W);
142}
143
144/******************************************************************************
145 *
146 * Start of read routines.
147 *
148 ******************************************************************************/
149
150int
151client::next_packet ()
152{
153 if (inbuf_len >= 2)
154 {
155 int pkt_len = (inbuf [0] << 8) | inbuf [1];
156
157 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len;
159
160 if (inbuf_len == sizeof (inbuf))
161 {
162 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
163 destroy ();
164 return -1;
165 }
166 }
167
168 return 0;
169}
170
171void
172client::skip_packet (int len)
173{
174 inbuf_len -= len;
175 memmove (inbuf, inbuf + len, inbuf_len);
176}
177
87/*********************************************************************** 178/*****************************************************************************
88 * 179 * Start of command dispatch area.
89 * SockList functions/utilities 180 * The commands here are protocol commands.
90 *
91 **********************************************************************/ 181 ****************************************************************************/
92 182
93void SockList_Init(SockList *sl) 183// SocketCommand, PlayingCommand, should not exist with those ugly casts
94{ 184#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
95 sl->len=0; 185#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
96 sl->buf=NULL;
97}
98 186
99void SockList_AddInt(SockList *sl, uint32 data) 187/**
100{ 188 * 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 */ 189 */
123int GetInt_String(unsigned char *data) 190static struct packet_type packets[] = {
124{ 191 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
125 return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); 192 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
126}
127 193
128short GetShort_String(unsigned char *data) { 194 {"examine", PC(ExamineCmd) PF_PLAYING },
129 return ((data[0]<<8)+data[1]); 195 {"ex", PC(ExCmd) PF_PLAYING },
130} 196 {"apply", PC(ApplyCmd) PF_PLAYING },
197 {"lookat", PC(LookAt) PF_PLAYING },
198 {"lock", PC(LockItem) PF_PLAYING },
199 {"mark", PC(MarkItem) PF_PLAYING },
200 {"move", PC(MoveCmd) PF_PLAYING },
201 {"ext", PC(ExtCmd) 0 }, // CF+
202 {"mapredraw", PC(MapRedrawCmd) 0 },
203 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
131 204
132/****************************************************************************** 205 {"reply", SC(ReplyCmd) 0 },
133 * 206 {"exti", SC(ExtiCmd) 0 }, // CF+
134 * Start of read routines. 207 {"addme", SC(AddMeCmd) 0 },
135 * 208 {"askface", SC(AskFaceCmd) 0 },
136 ******************************************************************************/ 209 {"requestinfo", SC(RequestInfo) 0 },
210 {"setfacemode", SC(SetFaceMode) 0 },
211 {"setsound", SC(SetSound) 0 },
212 {"setup", SC(SetUp) 0 },
213 {"version", SC(VersionCmd) 0 },
214 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
215 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
216 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
217};
137 218
138/** 219bool
139 * This reads from fd and puts the data in sl. We return true if we think 220client::may_execute (const packet_type *pkt) const
140 * we have a full packet, 0 if we have a partial packet. The only processing 221{
141 * we do is remove the intial size value. len (As passed) is the size of the 222 return (!(pkt->flags & PF_PLAYER) || pl)
142 * buffer allocated in the socklist. We make the assumption the buffer is 223 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
143 * at least 2 bytes long. 224}
225
226// HACK: some commands currently should be executed
227// even when the player is frozen. this hack detects
228// those commands. it should be folded into may_execute,
229// but kept seperate to emphasise the hack aspect, i.e.
230// do it better, then remove.
231static bool
232always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
233{
234 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
235 return false;
236
237 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
238 return false;
239
240 if (pkt->flags & PF_COMMAND6)
241 {
242 data += 6;
243 len -= 6;
244 }
245
246 if (len > 4 && !strncmp (data, "say " , 4))
247 return true;
248 if (len > 5 && !strncmp (data, "chat ", 5))
249 return true;
250
251 return false;
252}
253
254void
255client::execute (const packet_type *pkt, char *data, int datalen)
256{
257 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
258 {
259 //TODO: only one format
260 if (pkt->flags & PF_PLAYER)
261 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
262 else
263 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
264 }
265 else
266 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
267}
268
269bool
270client::handle_packet ()
271{
272 int pkt_len = next_packet ();
273
274 if (!pkt_len)
275 return false;
276 else if (pkt_len < 0)
277 {
278 LOG (llevError, "read error on player %s\n",
279 pl && pl->ob ? &pl->ob->name : "[anonymous]");
280 destroy ();
281 return false;
282 }
283
284 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
285
286 /* First, break out beginning word. There are at least
287 * a few commands that do not have any paremeters. If
288 * we get such a command, don't worry about trying
289 * to break it up.
144 */ 290 */
145 291 int datalen;
146int SockList_ReadPacket(int fd, SockList *sl, int len) 292 char *data = strchr ((char *)inbuf + 2, ' ');
147{
148 int stat,toread;
149 293
150 /* Sanity check - shouldn't happen */ 294 if (data)
151 if (sl->len < 0) { 295 {
152 abort(); 296 *data++ = 0;
297 datalen = pkt_len - (data - (char *)inbuf);
298 }
299 else
300 {
301 data = (char *)inbuf + 2; // better read garbage than segfault
302 datalen = 0;
303 }
304
305 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
306 if (!strcmp ((char *)inbuf + 2, pkt->name))
307 {
308 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
309 queue_command (pkt, data, datalen);
310 else
311 execute (pkt, data, datalen);
312
313 goto next_packet;
153 } 314 }
154 /* We already have a partial packet */
155 if (sl->len<2) {
156#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
157 315
158 stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); 316 // If we get here, we didn't find a valid command.
317 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
318next_packet:
319 skip_packet (pkt_len);
159 320
160#else 321 // input buffer has space again
322 socket_ev.poll (socket_ev.poll () | PE_R);
323
324 return true;
325}
326
327// callback called when socket is either readable or writable
328void
329client::socket_cb (iow &w, int got)
330{
331 //TODO remove when we have better socket cleanup logic
332 if (destroyed ())
333 {
334 socket_ev.poll (0);
335 return;
336 }
337
338 if (got & PE_W)
339 {
340 write_outputbuffer ();
341
342 if (!outputbuffer.len)
343 socket_ev.poll (socket_ev.poll () & ~PE_W);
344 }
345
346 if (got & PE_R)
347 {
348 //TODO: rate-limit tcp connection in better ways, important
349
350 int amount = sizeof (inbuf) - inbuf_len;
351
352 if (!amount)
161 do { 353 {
162 stat=read(fd, sl->buf + sl->len, 2-sl->len); 354 // input buffer full
163 } while ((stat==-1) && (errno==EINTR)); 355 socket_ev.poll (socket_ev.poll () & ~PE_R);
164#endif 356 return;
165 if (stat<0) { 357 }
166 /* In non blocking mode, EAGAIN is set when there is no 358
167 * data available. 359 amount = read (fd, inbuf + inbuf_len, amount);
168 */ 360
169#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 361 if (!amount)
170 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { 362 {
171 if(WSAGetLastError() == WSAECONNRESET) 363 destroy ();
172 LOG(llevDebug,"Connection closed by client\n"); 364 return;
173 else 365 }
366 else if (amount < 0)
367 {
368 if (errno != EAGAIN && errno != EINTR)
174 { 369 {
175 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); 370 LOG (llevError, "read error: %s\n", strerror (errno));
176 } 371 destroy ();
177 return -1; /* kick this user! */ 372 return;
178 } 373 }
179#else 374
180 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 375 // should not be here, normally
181 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
182 } 376 }
183#endif 377 else
184 return 0; /*Error */
185 } 378 {
186 if (stat==0) return -1; 379 inbuf_len += amount;
187 sl->len += stat; 380
188#ifdef CS_LOGSTATS
189 cst_tot.ibytes += stat; 381 cst_tot.ibytes += amount;
190 cst_lst.ibytes += stat; 382 cst_lst.ibytes += amount;
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 */
210 383
211 /* return error so the socket is closed */ 384 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 } 385 }
234#else 386 }
235 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 387}
236 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); 388
237 } 389// called whenever we have additional commands to process
238#endif 390void
239 return 0; /*Error */ 391client::cmd_cb (iw &w)
240 } 392{
241 if (stat==0) return -1; 393 if (handle_packet ())
242 sl->len += stat; 394 w.start ();
243#ifdef CS_LOGSTATS 395 else
244 cst_tot.ibytes += stat; 396 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} 397}
256 398
257/******************************************************************************* 399/*******************************************************************************
258 * 400 *
259 * Start of write related routines. 401 * Start of write related routines.
264 * Adds data to a socket buffer for whatever reason. 406 * Adds data to a socket buffer for whatever reason.
265 * 407 *
266 * ns is the socket we are adding the data to, buf is the start of the 408 * 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. 409 * data, and len is the number of bytes to add.
268 */ 410 */
269 411void
270static void add_to_buffer(NewSocket *ns, char *buf, int len) 412client::send (void *buf_, int len)
271{ 413{
414 char *buf = (char *)buf_;
415
416 if (destroyed () || !buf)
417 return;
418
419 if (len + outputbuffer.len > SOCKETBUFSIZE)
420 {
421 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
422 // shutdown the socket, this is safer than destroying it immediately
423 // as lots of code in the callchain might still access the map etc.
424 shutdown (fd, SHUT_RDWR);
425 return;
426 }
427
272 int avail, end; 428 int avail, end;
273 429
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 430 /* data + end is where we start putting the new data. The last byte
282 * currently in use is actually data + end -1 431 * currently in use is actually data + end -1
283 */ 432 */
284
285 end=ns->outputbuffer.start + ns->outputbuffer.len; 433 end = outputbuffer.start + outputbuffer.len;
286 /* The buffer is already in a wrapped state, so adjust end */ 434 /* The buffer is already in a wrapped state, so adjust end */
287 if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; 435 if (end >= SOCKETBUFSIZE)
436 end -= SOCKETBUFSIZE;
437
288 avail=SOCKETBUFSIZE - end; 438 avail = SOCKETBUFSIZE - end;
289 439
290 /* We can all fit it behind the current data without wrapping */ 440 /* We can all fit it behind the current data without wrapping */
291 if (avail >=len ) { 441 if (avail >= len)
292 memcpy(ns->outputbuffer.data + end, buf, len); 442 memcpy (outputbuffer.data + end, buf, len);
443 else
293 } 444 {
294 else {
295 memcpy(ns->outputbuffer.data + end, buf, avail); 445 memcpy (outputbuffer.data + end, buf, avail);
296 memcpy(ns->outputbuffer.data, buf+avail, len-avail); 446 memcpy (outputbuffer.data, buf + avail, len - avail);
297 } 447 }
448
298 ns->outputbuffer.len += len; 449 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} 450}
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
431 451
432/** 452/**
433 * Takes a string of data, and writes it out to the socket. A very handy 453 * Takes a string of data, and writes it out to the socket. A very handy
434 * shortcut function. 454 * shortcut function.
435 */ 455 */
436void cs_write_string(NewSocket *ns, const char *buf, int len) 456void
457client::send_packet (packet &sl)
437{ 458{
438 SockList sl; 459 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; 460 return;
458 461
459 if (msg->len >= MAXSOCKBUF) { 462 if (sl.length () >= MAXSOCKBUF)
463 {
460 LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", 464 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 465 /* Almost certainly we've overflowed a buffer, so quit now to make
463 * it easier to debug. 466 * it easier to debug.
464 */ 467 */
465 abort(); 468 abort ();
469 }
470
471 if (!sl.length ())
472 return;
473
474 assert (sl.hdrlen == 2);
475
476 sl.buf_ [0] = sl.length () >> 8;
477 sl.buf_ [1] = sl.length () ;
478
479 send (sl.buf_, sl.length () + sl.hdrlen);
480}
481
482void
483client::send_packet (const char *buf, int len)
484{
485 packet sl;
486
487 sl << data (buf, len);
488 send_packet (sl);
489}
490
491void
492client::send_packet (const char *buf)
493{
494 send_packet (buf, strlen (buf));
495}
496
497void
498client::send_packet_printf (const char *format, ...)
499{
500 packet sl;
501
502 va_list ap;
503 va_start (ap, format);
504 sl.vprintf (format, ap);
505 va_end (ap);
506
507 send_packet (sl);
508}
509
510void
511client::send_drawinfo (const char *msg, int flags)
512{
513 send_packet_printf ("drawinfo %d %s", flags, msg);
514}
515
516void
517client::send_msg (int color, const char *type, const char *msg)
518{
519 if (can_msg)
520 send_packet_printf ("msg %d %s %s", color, type, msg);
521 else if (color < 0)
522 return; // client cannot handle this
523 else if (strchr (msg, '<') || strchr (msg, '&'))
466 } 524 {
467 sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; 525 //TODO: should escape/modify to old syntax
468 sbuf[1] = ((uint32)(msg->len)) & 0xFF; 526 send_packet_printf ("drawinfo %d %s", color, msg);
469 if (ns->status != Ns_Old) 527 }
470 Write_To_Socket(ns, (char *) sbuf, 2); 528 else
471 Write_To_Socket(ns, (char*)msg->buf, msg->len); 529 send_packet_printf ("drawinfo %d %s", color, msg);
472} 530}
473 531
474/** 532/***********************************************************************
475 * Takes a string of data, and writes it out to the socket. A very handy
476 * shortcut function.
477 */ 533 *
478void Write_String_To_Socket(NewSocket *ns, char *buf, int len) 534 * packet functions/utilities
479{ 535 *
480 SockList sl; 536 **********************************************************************/
481 537
482 sl.len = len; 538packet::packet (const char *name)
483 sl.buf = (unsigned char*) buf; 539{
484 Send_With_Handling(ns, &sl); 540 reset ();
485}
486 541
542 int len = strlen (name);
543 memcpy (cur, name, len); cur += len;
544 *cur++ = ' ';
545}
546
547packet &packet::operator <<(const ber32 v)
548{
549 enum { maxlen = 32 / 7 + 1};
550 uint8 buf[maxlen];
551 uint8 *p = buf + maxlen;
552 uint32 val = v.val;
553
554 *--p = val & 0x7F;
555
556 while (val > 0x7F)
557 {
558 val >>= 7;
559 *--p = (val & 0x7F) | 0x80;
560 }
561
562 return *this << data (p, buf + maxlen - p);
563}
564
565packet &packet::operator <<(const data &v)
566{
567 if (room () < v.len)
568 reset ();
569 else
570 {
571 if (v.len)
572 {
573 memcpy (cur, v.ptr, v.len);
574 cur += v.len;
575 }
576 }
577
578 return *this;
579}
580
581packet &packet::operator <<(const data8 &v)
582{
583 unsigned int len = min (v.len, 0x00FF);
584 return *this << uint8 (len) << data (v.ptr, len);
585}
586
587packet &packet::operator <<(const data16 &v)
588{
589 unsigned int len = min (v.len, 0xFFFF);
590 return *this << uint16 (len) << data (v.ptr, len);
591}
592
593packet &packet::operator <<(const char *v)
594{
595 return *this << data (v, strlen (v ? v : 0));
596}
597
598void
599packet::vprintf (const char *format, va_list ap)
600{
601 int size = room ();
602
603 int len = vsnprintf ((char *)cur, size, format, ap);
604
605 if (len >= size)
606 return reset ();
607
608 cur += len;
609}
487 610
488/****************************************************************************** 611/******************************************************************************
489 * 612 *
490 * statistics logging functions. 613 * statistics logging functions.
491 * 614 *
492 ******************************************************************************/ 615 ******************************************************************************/
493 616
494#ifdef CS_LOGSTATS 617#ifdef CS_LOGSTATS
618
495/* cst_tot is for the life of the server, cst_last is for the last series of 619/* cst_tot is for the life of the server, cst_last is for the last series of
496 * stats 620 * stats
497 */ 621 */
498CS_Stats cst_tot, cst_lst; 622CS_Stats cst_tot, cst_lst;
499 623
500/** 624/**
501 * Writes out the gathered stats. We clear cst_lst. 625 * Writes out the gathered stats. We clear cst_lst.
502 */ 626 */
627void
503void write_cs_stats(void) 628write_cs_stats (void)
504{ 629{
505 time_t now=time(NULL); 630 time_t now = time (NULL);
506 631
507 /* If no connections recently, don't both to log anything */ 632 /* If no connections recently, don't both to log anything */
508 if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; 633 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
634 return;
509 635
510 /* CSSTAT is put in so scripts can easily find the line */ 636 /* 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", 637 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, 638 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
513 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, 639 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
514 cst_lst.max_conn, now - cst_lst.time_start);
515 cst_lst.ibytes=0; 640 cst_lst.ibytes = 0;
516 cst_lst.obytes=0; 641 cst_lst.obytes = 0;
517 cst_lst.max_conn=socket_info.nconns;
518 cst_lst.time_start=now; 642 cst_lst.time_start = now;
519} 643}
520#endif 644#endif
645

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