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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.1 by elmex, Sun Aug 13 17:16:06 2006 UTC vs.
Revision 1.78 by root, Fri Apr 30 20:43:18 2010 UTC

1
2/* 1/*
3 * static char *rcsid_sockets_c = 2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
4 * "$Id: lowlevel.C,v 1.1 2006/08/13 17:16:06 elmex Exp $"; 3 *
4 * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify it under
7 * the terms of the Affero GNU General Public License as published by the
8 * Free Software Foundation, either version 3 of the License, or (at your
9 * option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the Affero GNU General Public License
17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
19 *
20 * The authors can be reached via e-mail to <support@deliantra.net>
5 */ 21 */
6 22
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; 23using namespace std;
42 24
43#include <global.h> 25#include <global.h>
44#include <newclient.h>
45#include <sproto.h> 26#include <sproto.h>
27#include <cstdarg>
46 28
47#ifdef __linux__ 29#if HAVE_TCP_INFO
48# include <sys/types.h> 30# include <sys/types.h>
49# include <sys/socket.h> 31# include <sys/socket.h>
50# include <netinet/in.h> 32# include <netinet/in.h>
51# define TCP_HZ 1000 // sorry...
52# include <netinet/tcp.h> 33# include <netinet/tcp.h>
53#endif 34#endif
54 35
55// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// force a packet when idle for more than this many seconds,
56// easily die in 20 seconds... 37// forcing an ack regularly.
57#define SOCKET_TIMEOUT1 10 38#define IDLE_PING 2.
58#define SOCKET_TIMEOUT2 20
59 39
60void Socket_Flush (NewSocket *ns) 40void
41client::flush ()
61{ 42{
62#ifdef __linux__ 43 if (destroyed ())
63 // check time of last ack, and, if too old, kill connection 44 return;
64 struct tcp_info tcpi;
65 socklen_t len = sizeof (tcpi);
66 45
67 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 46 /**
68 { 47 * Writes data to socket.
69 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 48 *
49 * When the socket is clear to write, and we have backlogged data, this
50 * is called to write it out.
51 */
70 52
71 if (tcpi.tcpi_unacked 53 // write a nop to the socket at least every IDLE_NOP seconds.
72 && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 54 if (!outputbuffer.len)
73 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 55 {
74 { 56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
76 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
77 ns->status = Ns_Dead;
78 } 57 {
58 // this is a bit ugly, but map1/map1a seem to be the only
59 // nop'able commands and they are quite small.
60 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
61 send_packet (sl);
62 }
63 else
64 return;
65 }
66
67 if (socket_ev.poll () & EV_WRITE)
68 return;
69
70 last_send = NOW;
71 write_outputbuffer ();
72}
73
74void
75client::write_outputbuffer ()
76{
77 while (outputbuffer.len)
79 } 78 {
79 int res = write (fd, outputbuffer.data + outputbuffer.start,
80 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
80 81
81 int val; 82 if (res > 0)
82 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 83 {
83 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 84 outputbuffer.start += res;
84#endif 85 /* wrap back to start of buffer */
85} 86 if (outputbuffer.start == SOCKETBUFSIZE)
87 outputbuffer.start = 0;
86 88
89 outputbuffer.len -= res;
90 }
91 else if (res == 0)
92 {
93 LOG (llevError, "socket write failed, connection closed.\n");
94 destroy ();
95 return;
96 }
97 else if (errno == EINTR)
98 {
99 // just retry
100 }
101 else if (errno == EAGAIN)
102 {
103 // delay till ready
104 socket_ev.poll (socket_ev.poll () | EV_WRITE);
105 socket_ev.start ();
106 return;
107 }
108 else
109 {
110 LOG (llevError, "socket write failed: %s\n", strerror (errno));
111 destroy ();
112 return;
113 }
114 }
115
116 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
117}
118
119/******************************************************************************
120 *
121 * Start of read routines.
122 *
123 ******************************************************************************/
124
125int
126client::next_packet ()
127{
128 if (inbuf_len >= 2)
129 {
130 int pkt_len = (inbuf [0] << 8) | inbuf [1];
131
132 if (inbuf_len >= 2 + pkt_len)
133 return 2 + pkt_len;
134
135 if (inbuf_len == sizeof (inbuf))
136 {
137 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
138 destroy ();
139 return -1;
140 }
141 }
142
143 return 0;
144}
145
146void
147client::skip_packet (int len)
148{
149 inbuf_len -= len;
150 memmove (inbuf, inbuf + len, inbuf_len);
151}
152
87/*********************************************************************** 153/*****************************************************************************
88 * 154 * Start of command dispatch area.
89 * SockList functions/utilities 155 * The commands here are protocol commands.
90 *
91 **********************************************************************/ 156 ****************************************************************************/
92 157
93void SockList_Init(SockList *sl) 158// SocketCommand, PlayingCommand, should not exist with those ugly casts
94{ 159#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
95 sl->len=0; 160#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
96 sl->buf=NULL;
97}
98 161
99void SockList_AddChar(SockList *sl, char c) 162static void
163NopCmd (char *, int, client *)
100{ 164{
101 sl->buf[sl->len]=c; 165 // do nothing
102 sl->len++;
103} 166}
104 167
105void SockList_AddShort(SockList *sl, uint16 data) 168/**
106{ 169 * Dispatch table for the server.
107 sl->buf[sl->len++]= (data>>8)&0xff;
108 sl->buf[sl->len++] = data & 0xff;
109}
110
111
112void SockList_AddInt(SockList *sl, uint32 data)
113{
114 sl->buf[sl->len++]= (data>>24)&0xff;
115 sl->buf[sl->len++]= (data>>16)&0xff;
116 sl->buf[sl->len++]= (data>>8)&0xff;
117 sl->buf[sl->len++] = data & 0xff;
118}
119
120void SockList_AddInt64(SockList *sl, uint64 data)
121{
122 sl->buf[sl->len++]= ( char )( (data>>56)&0xff );
123 sl->buf[sl->len++]= ( char )( (data>>48)&0xff );
124 sl->buf[sl->len++]= ( char )( (data>>40)&0xff );
125 sl->buf[sl->len++]= ( char )( (data>>32)&0xff );
126
127 sl->buf[sl->len++]= ( char )( (data>>24)&0xff );
128 sl->buf[sl->len++]= ( char )( (data>>16)&0xff );
129 sl->buf[sl->len++]= ( char )( (data>>8)&0xff );
130 sl->buf[sl->len++] =( char )( data & 0xff );
131}
132
133/* Basically does the reverse of SockList_AddInt, but on
134 * strings instead. Same for the GetShort, but for 16 bits.
135 */ 170 */
136int GetInt_String(unsigned char *data) 171static struct packet_type packets[] = {
137{ 172 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
138 return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); 173 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
139}
140 174
141short GetShort_String(unsigned char *data) { 175 {"examine", PC(ExamineCmd) PF_PLAYING },
142 return ((data[0]<<8)+data[1]); 176 {"ex", PC(ExCmd) PF_PLAYING },
143} 177 {"apply", PC(ApplyCmd) PF_PLAYING },
178 {"lookat", PC(LookAt) PF_PLAYING },
179 {"lock", PC(LockItem) PF_PLAYING },
180 {"mark", PC(MarkItem) PF_PLAYING },
181 {"move", PC(MoveCmd) PF_PLAYING },
182 {"ext", PC(ExtCmd) 0 }, // CF+/Deliantra
183 {"mapredraw", PC(MapRedrawCmd) 0 },
184 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+/Deliantra
144 185
145/****************************************************************************** 186 {"reply", SC(ReplyCmd) 0 },
146 * 187 {"exti", SC(ExtiCmd) 0 }, // CF+/Deliantra
147 * Start of read routines. 188 {"addme", SC(AddMeCmd) 0 },
148 * 189 {"askface", SC(AskFaceCmd) 0 },
149 ******************************************************************************/ 190 {"requestinfo", SC(RequestInfo) 0 },
191 {"setsound", SC(SetSound) 0 },
192 {"setup", SC(SetUp) 0 },
193 {"version", SC(VersionCmd) 0 },
150 194
151/** 195 {"toggleextendedtext", SC(NopCmd) 0 }, // deliantra: disabled
152 * This reads from fd and puts the data in sl. We return true if we think 196};
153 * we have a full packet, 0 if we have a partial packet. The only processing
154 * we do is remove the intial size value. len (As passed) is the size of the
155 * buffer allocated in the socklist. We make the assumption the buffer is
156 * at least 2 bytes long.
157 */
158
159int SockList_ReadPacket(int fd, SockList *sl, int len)
160{
161 int stat,toread;
162 197
163 /* Sanity check - shouldn't happen */ 198bool
164 if (sl->len < 0) { 199client::may_execute (const packet_type *pkt) const
165 abort(); 200{
201 return (!(pkt->flags & PF_PLAYER) || pl)
202 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
203}
204
205// HACK: some commands currently should be executed
206// even when the player is frozen. this hack detects
207// those commands. it should be folded into may_execute,
208// but kept seperate to emphasise the hack aspect, i.e.
209// do it better, then remove.
210static bool
211always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
212{
213 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
214 return false;
215
216 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
217 return false;
218
219 if (pkt->flags & PF_COMMAND6)
166 } 220 {
167 /* We already have a partial packet */ 221 data += 6;
168 if (sl->len<2) { 222 len -= 6;
169#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */
170
171 stat=recv(fd, sl->buf + sl->len, 2-sl->len,0);
172
173#else
174 do {
175 stat=read(fd, sl->buf + sl->len, 2-sl->len);
176 } while ((stat==-1) && (errno==EINTR));
177#endif
178 if (stat<0) {
179 /* In non blocking mode, EAGAIN is set when there is no
180 * data available.
181 */
182#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */
183 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
184 if(WSAGetLastError() == WSAECONNRESET)
185 LOG(llevDebug,"Connection closed by client\n");
186 else
187 {
188 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
189 }
190 return -1; /* kick this user! */
191 } 223 }
192#else 224
193 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 225 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
194 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); 226 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
227 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
228 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
229 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
230
231 if (len == 7 && !strcmp (data, "suicide")) return true;
232
233 return false;
234}
235
236void
237client::execute (const packet_type *pkt, char *data, int datalen)
238{
239 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
240 {
241 //TODO: only one format
242 if (pkt->flags & PF_PLAYER)
243 {
244 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
245 pl->need_updated_stats ();
246 }
247 else
248 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
195 } 249 }
196#endif 250 else
197 return 0; /*Error */ 251 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
198 } 252}
199 if (stat==0) return -1; 253
200 sl->len += stat; 254bool
201#ifdef CS_LOGSTATS 255client::handle_packet ()
202 cst_tot.ibytes += stat; 256{
203 cst_lst.ibytes += stat; 257 int pkt_len = next_packet ();
204#endif 258
205 if (stat<2) return 0; /* Still don't have a full packet */ 259 if (!pkt_len)
260 return false;
261 else if (pkt_len < 0)
206 } 262 {
207 /* Figure out how much more data we need to read. Add 2 from the 263 LOG (llevError, "read error on player %s\n",
208 * end of this - size header information is not included. 264 pl && pl->ob ? &pl->ob->name : "[anonymous]");
209 */ 265 destroy ();
210 toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len; 266 return false;
211 if ((toread + sl->len) >= len) {
212 LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n",
213 toread + sl->len, len);
214 /* Quick hack in case for 'oldsocketmode' input. If we are
215 * closing the socket anyways, then reading this extra 100 bytes
216 * shouldn't hurt.
217 */
218#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
219 recv(fd, sl->buf+2, 100, 0);
220#else
221 read(fd, sl->buf+2, 100);
222#endif /* end win32 */
223
224 /* return error so the socket is closed */
225 return -1;
226 }
227 do {
228#ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */
229 stat = recv(fd, sl->buf+ sl->len, toread, 0);
230#else
231 do {
232 stat = read(fd, sl->buf+ sl->len, toread);
233 } while ((stat<0) && (errno==EINTR));
234#endif
235 if (stat<0) {
236
237#ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */
238 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) {
239 if(WSAGetLastError() == WSAECONNRESET)
240 LOG(llevDebug,"Connection closed by client\n");
241 else
242 {
243 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError());
244 }
245 return -1; /* kick this user! */
246 } 267 }
247#else 268
248 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 269 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
249 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); 270 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
271
272 /* First, break out beginning word. There are at least
273 * a few commands that do not have any paremeters. If
274 * we get such a command, don't worry about trying
275 * to break it up.
276 */
277 int datalen;
278 char *data = strchr ((char *)inbuf + 2, ' ');
279
280 if (data)
281 {
282 *data++ = 0;
283 datalen = pkt_len - (data - (char *)inbuf);
250 } 284 }
251#endif 285 else
252 return 0; /*Error */ 286 {
253 } 287 data = (char *)inbuf + 2; // better read garbage than segfault
254 if (stat==0) return -1; 288 datalen = 0;
255 sl->len += stat; 289 }
256#ifdef CS_LOGSTATS 290
257 cst_tot.ibytes += stat; 291 for (packet_type *pkt = packets; pkt < packets + array_length (packets); ++pkt)
258 cst_lst.ibytes += stat; 292 if (!strcmp ((char *)inbuf + 2, pkt->name))
259#endif 293 {
260 toread -= stat; 294 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
261 if (toread==0) return 1; 295 queue_command (pkt, data, datalen);
262 if (toread < 0) { 296 else
263 LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n"); 297 execute (pkt, data, datalen);
264 return 1; 298
265 } 299 goto next_packet;
266 } while (toread>0); 300 }
301
302 // If we get here, we didn't find a valid command.
303 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
304
305next_packet:
306 inbuf [pkt_len] = save_byte; // rather ugly
307 skip_packet (pkt_len);
308
309 // input buffer has space again
310 socket_ev.poll (socket_ev.poll () | EV_READ);
311
312 return true;
313}
314
315// callback called when socket is either readable or writable
316void
317client::socket_cb (iow &w, int revents)
318{
319 //TODO remove when we have better socket cleanup logic
320 if (destroyed ())
321 {
322 socket_ev.poll (0);
267 return 0; 323 return;
324 }
325
326 if (revents & EV_WRITE)
327 {
328 write_outputbuffer ();
329
330 if (!outputbuffer.len)
331 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
332 }
333
334 if (revents & EV_READ)
335 {
336 //TODO: rate-limit tcp connection in better ways, important
337
338 int amount = sizeof (inbuf) - inbuf_len;
339
340 if (!amount)
341 {
342 // input buffer full
343 socket_ev.poll (socket_ev.poll () & ~EV_READ);
344 return;
345 }
346
347 amount = read (fd, inbuf + inbuf_len, amount);
348
349 if (!amount)
350 {
351 destroy ();
352 return;
353 }
354 else if (amount < 0)
355 {
356 if (errno != EAGAIN && errno != EINTR)
357 {
358 LOG (llevError, "read error: %s\n", strerror (errno));
359 destroy ();
360 return;
361 }
362
363 // should not be here, normally
364 }
365 else
366 {
367 inbuf_len += amount;
368
369 if (handle_packet ())
370 {
371 while (handle_packet ())
372 ;
373
374 flush ();
375 }
376 }
377 }
268} 378}
269 379
270/******************************************************************************* 380/*******************************************************************************
271 * 381 *
272 * Start of write related routines. 382 * Start of write related routines.
277 * Adds data to a socket buffer for whatever reason. 387 * Adds data to a socket buffer for whatever reason.
278 * 388 *
279 * ns is the socket we are adding the data to, buf is the start of the 389 * ns is the socket we are adding the data to, buf is the start of the
280 * data, and len is the number of bytes to add. 390 * data, and len is the number of bytes to add.
281 */ 391 */
282 392void
283static void add_to_buffer(NewSocket *ns, char *buf, int len) 393client::send (void *buf_, int len)
284{ 394{
395 char *buf = (char *)buf_;
396
397 if (destroyed () || !buf)
398 return;
399
400 if (len + outputbuffer.len > SOCKETBUFSIZE)
401 {
402 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
403 // shutdown the socket, this is safer than destroying it immediately
404 // as lots of code in the callchain might still access the map etc.
405 shutdown (fd, SHUT_RDWR);
406 return;
407 }
408
285 int avail, end; 409 int avail, end;
286 410
287 if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) {
288 LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n",
289 ns->fd);
290 ns->status = Ns_Dead;
291 return;
292 }
293
294 /* data + end is where we start putting the new data. The last byte 411 /* data + end is where we start putting the new data. The last byte
295 * currently in use is actually data + end -1 412 * currently in use is actually data + end -1
296 */ 413 */
297
298 end=ns->outputbuffer.start + ns->outputbuffer.len; 414 end = outputbuffer.start + outputbuffer.len;
299 /* The buffer is already in a wrapped state, so adjust end */ 415 /* The buffer is already in a wrapped state, so adjust end */
300 if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; 416 if (end >= SOCKETBUFSIZE)
417 end -= SOCKETBUFSIZE;
418
301 avail=SOCKETBUFSIZE - end; 419 avail = SOCKETBUFSIZE - end;
302 420
303 /* We can all fit it behind the current data without wrapping */ 421 /* We can all fit it behind the current data without wrapping */
304 if (avail >=len ) { 422 if (avail >= len)
305 memcpy(ns->outputbuffer.data + end, buf, len); 423 memcpy (outputbuffer.data + end, buf, len);
424 else
306 } 425 {
307 else {
308 memcpy(ns->outputbuffer.data + end, buf, avail); 426 memcpy (outputbuffer.data + end, buf, avail);
309 memcpy(ns->outputbuffer.data, buf+avail, len-avail); 427 memcpy (outputbuffer.data, buf + avail, len - avail);
310 }
311 ns->outputbuffer.len += len;
312#if 0
313 LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len,
314 ns->outputbuffer.len, ns->outputbuffer.start);
315#endif
316}
317
318/**
319 * Writes data to socket.
320 *
321 * When the socket is clear to write, and we have backlogged data, this
322 * is called to write it out.
323 */
324void write_socket_buffer(NewSocket *ns)
325{
326 int amt, max;
327
328 if (ns->outputbuffer.len==0) {
329 LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n",
330 ns->fd);
331 return;
332 }
333
334 do {
335 max = SOCKETBUFSIZE - ns->outputbuffer.start;
336 if (ns->outputbuffer.len<max) max = ns->outputbuffer.len;
337
338#ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */
339 amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0);
340#else
341 do {
342 amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
343 } while ((amt<0) && (errno==EINTR));
344#endif
345
346 if (amt < 0) { /* We got an error */
347
348#ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */
349 if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
350 LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError());
351#else
352 if (errno !=EWOULDBLOCK) {
353 LOG(llevError,"New socket write failed (wsb) (%d: %s).\n",
354 errno, strerror_local(errno));
355#endif
356 ns->status=Ns_Dead;
357 return;
358 } 428 }
359 else { /* EWOULDBLOCK */
360 /* can't write it, so store it away. */
361 ns->can_write=0;
362 return;
363 }
364 }
365 ns->outputbuffer.start += amt;
366 /* wrap back to start of buffer */
367 if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0;
368 ns->outputbuffer.len -= amt;
369#ifdef CS_LOGSTATS
370 cst_tot.obytes += amt;
371 cst_lst.obytes += amt;
372 #endif
373 } while (ns->outputbuffer.len>0);
374}
375 429
376/** 430 outputbuffer.len += len;
377 * This writes data to the socket. - It is very low level -
378 * all we try and do is write out the data to the socket
379 * provided (ns). buf is the data to write, len is the number
380 * of bytes to write. IT doesn't return anything - rather, it
381 * updates the ns structure if we get an error.
382 */
383void Write_To_Socket(NewSocket *ns, char *buf, int len)
384{
385 int amt=0;
386 char *pos=buf;
387
388 if (ns->status == Ns_Dead || !buf) {
389 LOG(llevDebug,"Write_To_Socket called with dead socket\n");
390 return;
391 }
392
393#ifndef __GNU__ /* This caused problems on Hurd */
394 if (!ns->can_write) {
395 add_to_buffer(ns, buf, len);
396 return;
397 }
398#endif
399 /* If we manage to write more than we wanted, take it as a bonus */
400 while (len>0) {
401
402#ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */
403 amt=send(ns->fd, pos, len,0);
404#else
405 do {
406 amt=write(ns->fd, pos, len);
407 } while ((amt<0) && (errno==EINTR));
408#endif
409
410 if (amt < 0) { /* We got an error */
411#ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */
412 if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) {
413 LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError());
414#else
415 if (errno !=EWOULDBLOCK) {
416 LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
417 errno, strerror_local(errno));
418#endif
419 ns->status=Ns_Dead;
420 return;
421 }
422 else { /* EWOULDBLOCK */
423 /* can't write it, so store it away. */
424 add_to_buffer(ns, pos, len);
425 ns->can_write=0;
426 return;
427 }
428 }
429 /* amt gets set to 0 above in blocking code, so we do this as
430 * an else if to make sure we don't reprocess it.
431 */
432 else if (amt==0) {
433 LOG(llevError,"Write_To_Socket: No data written out.\n");
434 }
435 len -= amt;
436 pos += amt;
437#ifdef CS_LOGSTATS
438 cst_tot.obytes += amt;
439 cst_lst.obytes += amt;
440 #endif
441 }
442} 431}
443
444 432
445/** 433/**
446 * Takes a string of data, and writes it out to the socket. A very handy 434 * Takes a string of data, and writes it out to the socket. A very handy
447 * shortcut function. 435 * shortcut function.
448 */ 436 */
449void cs_write_string(NewSocket *ns, const char *buf, int len) 437void
438client::send_packet (packet &sl)
450{ 439{
451 SockList sl; 440 if (destroyed ())
441 return;
452 442
453 sl.len = len; 443 if (sl.length () > MAXSOCKBUF)
454 sl.buf = (unsigned char*)buf; 444 {
455 Send_With_Handling(ns, &sl);
456}
457
458
459/**
460 * Calls Write_To_Socket to send data to the client.
461 *
462 * The only difference in this function is that we take a SockList
463 *, and we prepend the length information.
464 */
465void Send_With_Handling(NewSocket *ns,SockList *msg)
466{
467 unsigned char sbuf[4];
468
469 if (ns->status == Ns_Dead || !msg)
470 return;
471
472 if (msg->len >= MAXSOCKBUF) {
473 LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", 445 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
474 msg->len);
475 /* Almost certainly we've overflowed a buffer, so quite now to make 446 /* Almost certainly we've overflowed a buffer, so quit now to make
476 * it easier to debug. 447 * it easier to debug.
477 */ 448 */
478 abort(); 449 abort ();
450 }
451
452 if (!sl.length ())
453 return;
454
455 assert (sl.hdrlen == 2);
456
457 sl.buf_ [0] = sl.length () >> 8;
458 sl.buf_ [1] = sl.length () ;
459
460 send (sl.buf_, sl.length () + sl.hdrlen);
461}
462
463void
464client::send_packet (const char *buf, int len)
465{
466 packet sl;
467
468 sl << data (buf, len);
469 send_packet (sl);
470}
471
472void
473client::send_packet (const char *buf)
474{
475 send_packet (buf, strlen (buf));
476}
477
478void
479client::send_packet_printf (const char *format, ...)
480{
481 packet sl;
482
483 va_list ap;
484 va_start (ap, format);
485 sl.vprintf (format, ap);
486 va_end (ap);
487
488 send_packet (sl);
489}
490
491void
492client::send_msg (int color, const char *type, const char *msg)
493{
494 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
479 } 495 {
480 sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; 496 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
481 sbuf[1] = ((uint32)(msg->len)) & 0xFF; 497 return;
482 if (ns->status != Ns_Old) 498 }
483 Write_To_Socket(ns, (char *) sbuf, 2);
484 Write_To_Socket(ns, (char*)msg->buf, msg->len);
485}
486 499
487/** 500 int len = strlen (msg);
488 * Takes a string of data, and writes it out to the socket. A very handy
489 * shortcut function.
490 */
491void Write_String_To_Socket(NewSocket *ns, char *buf, int len)
492{
493 SockList sl;
494 501
495 sl.len = len; 502 if (!(color & NDI_VERBATIM)
496 sl.buf = (unsigned char*) buf; 503 && (msg_is_special (msg)
497 Send_With_Handling(ns, &sl); 504 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
505 cfperl_send_msg (this, color, type, msg);
506 else
507 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
498} 508}
499 509
510void
511client::send_drawinfo (const char *msg, int flags)
512{
513 send_msg (flags, "log", msg);
514}
500 515
501/****************************************************************************** 516/***********************************************************************
502 * 517 *
503 * statistics logging functions. 518 * packet functions/utilities
504 * 519 *
505 ******************************************************************************/ 520 **********************************************************************/
506 521
507#ifdef CS_LOGSTATS 522packet::packet (const char *name)
508/* cst_tot is for the life of the server, cst_last is for the last series of
509 * stats
510 */
511CS_Stats cst_tot, cst_lst;
512
513/**
514 * Writes out the gathered stats. We clear cst_lst.
515 */
516void write_cs_stats(void)
517{ 523{
518 time_t now=time(NULL); 524 reset ();
519 525
520 /* If no connections recently, don't both to log anything */ 526 int len = strlen (name);
521 if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; 527 memcpy (cur, name, len); cur += len;
522 528 *cur++ = ' ';
523 /* CSSTAT is put in so scripts can easily find the line */
524 LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
525 ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
526 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes,
527 cst_lst.max_conn, now - cst_lst.time_start);
528 cst_lst.ibytes=0;
529 cst_lst.obytes=0;
530 cst_lst.max_conn=socket_info.nconns;
531 cst_lst.time_start=now;
532} 529}
533#endif 530
531packet &packet::operator <<(const ber32 v)
532{
533 enum { maxlen = 32 / 7 + 1};
534 uint8 buf[maxlen];
535 uint8 *p = buf + maxlen;
536 uint32 val = v.val;
537
538 *--p = val & 0x7F;
539
540 while (val > 0x7F)
541 {
542 val >>= 7;
543 *--p = (val & 0x7F) | 0x80;
544 }
545
546 return *this << data (p, buf + maxlen - p);
547}
548
549packet &packet::operator <<(const data &v)
550{
551 if (room () < v.len)
552 reset ();
553 else
554 {
555 if (v.len)
556 {
557 memcpy (cur, v.ptr, v.len);
558 cur += v.len;
559 }
560 }
561
562 return *this;
563}
564
565packet &packet::operator <<(const data8 &v)
566{
567 unsigned int len = min (v.len, 0x00FF);
568 return *this << uint8 (len) << data (v.ptr, len);
569}
570
571packet &packet::operator <<(const data16 &v)
572{
573 unsigned int len = min (v.len, 0xFFFF);
574 return *this << uint16 (len) << data (v.ptr, len);
575}
576
577packet &packet::operator <<(const char *v)
578{
579 return *this << data (v, strlen (v ? v : 0));
580}
581
582void
583packet::vprintf (const char *format, va_list ap)
584{
585 int size = room ();
586
587 int len = vsnprintf ((char *)cur, size, format, ap);
588
589 if (len >= size)
590 return reset ();
591
592 cur += len;
593}
594

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