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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 1.74 by root, Wed Nov 11 04:45:23 2009 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 1.3 2006/08/29 08:01:38 root Exp $"; 3 *
4 * Copyright (©) 2005,2006,2007,2008,2009 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_AddInt(SockList *sl, uint32 data) 162/**
100{ 163 * 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 */ 164 */
123int GetInt_String(unsigned char *data) 165static struct packet_type packets[] = {
124{ 166 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
125 return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); 167 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
126}
127 168
128short GetShort_String(unsigned char *data) { 169 {"examine", PC(ExamineCmd) PF_PLAYING },
129 return ((data[0]<<8)+data[1]); 170 {"ex", PC(ExCmd) PF_PLAYING },
130} 171 {"apply", PC(ApplyCmd) PF_PLAYING },
172 {"lookat", PC(LookAt) PF_PLAYING },
173 {"lock", PC(LockItem) PF_PLAYING },
174 {"mark", PC(MarkItem) PF_PLAYING },
175 {"move", PC(MoveCmd) PF_PLAYING },
176 {"ext", PC(ExtCmd) 0 }, // CF+
177 {"mapredraw", PC(MapRedrawCmd) 0 },
178 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
131 179
132/****************************************************************************** 180 {"reply", SC(ReplyCmd) 0 },
133 * 181 {"exti", SC(ExtiCmd) 0 }, // CF+
134 * Start of read routines. 182 {"addme", SC(AddMeCmd) 0 },
135 * 183 {"askface", SC(AskFaceCmd) 0 },
136 ******************************************************************************/ 184 {"requestinfo", SC(RequestInfo) 0 },
185 {"setsound", SC(SetSound) 0 },
186 {"setup", SC(SetUp) 0 },
187 {"version", SC(VersionCmd) 0 },
188 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
189};
137 190
138/** 191bool
139 * This reads from fd and puts the data in sl. We return true if we think 192client::may_execute (const packet_type *pkt) const
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 */
145
146int SockList_ReadPacket(int fd, SockList *sl, int len)
147{ 193{
148 int stat,toread; 194 return (!(pkt->flags & PF_PLAYER) || pl)
195 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
196}
149 197
150 /* Sanity check - shouldn't happen */ 198// HACK: some commands currently should be executed
151 if (sl->len < 0) { 199// even when the player is frozen. this hack detects
152 abort(); 200// those commands. it should be folded into may_execute,
201// but kept seperate to emphasise the hack aspect, i.e.
202// do it better, then remove.
203static bool
204always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
205{
206 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
207 return false;
208
209 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
210 return false;
211
212 if (pkt->flags & PF_COMMAND6)
153 } 213 {
154 /* We already have a partial packet */ 214 data += 6;
155 if (sl->len<2) { 215 len -= 6;
156#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */ 216 }
157 217
158 stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); 218 if (len > 4 && data [ 3] == ' ' && !strncmp (data, "say " , 4)) return true;
219 if (len > 5 && data [ 4] == ' ' && !strncmp (data, "chat " , 5)) return true;
220 if (len > 6 && data [ 5] == ' ' && !strncmp (data, "shout " , 6)) return true;
221 if (len > 8 && data [ 7] == ' ' && !strncmp (data, "suicide " , 8)) return true;
222 if (len > 18 && data [17] == ' ' && !strncmp (data, "accept-invitation ", 18)) return true;
159 223
160#else 224 if (len == 7 && !strcmp (data, "suicide")) return true;
225
226 return false;
227}
228
229void
230client::execute (const packet_type *pkt, char *data, int datalen)
231{
232 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
233 {
234 //TODO: only one format
235 if (pkt->flags & PF_PLAYER)
161 do { 236 {
162 stat=read(fd, sl->buf + sl->len, 2-sl->len); 237 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
163 } while ((stat==-1) && (errno==EINTR)); 238 pl->need_updated_stats ();
164#endif 239 }
165 if (stat<0) { 240 else
166 /* In non blocking mode, EAGAIN is set when there is no 241 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
167 * data available. 242 }
168 */ 243 else
169#ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ 244 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
170 if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { 245}
171 if(WSAGetLastError() == WSAECONNRESET) 246
172 LOG(llevDebug,"Connection closed by client\n"); 247bool
248client::handle_packet ()
249{
250 int pkt_len = next_packet ();
251
252 if (!pkt_len)
253 return false;
254 else if (pkt_len < 0)
255 {
256 LOG (llevError, "read error on player %s\n",
257 pl && pl->ob ? &pl->ob->name : "[anonymous]");
258 destroy ();
259 return false;
260 }
261
262 uint8_t save_byte = inbuf [pkt_len]; // rather ugly
263 inbuf [pkt_len] = 0; /* temporarily terminate buffer - useful for string data */
264
265 /* First, break out beginning word. There are at least
266 * a few commands that do not have any paremeters. If
267 * we get such a command, don't worry about trying
268 * to break it up.
269 */
270 int datalen;
271 char *data = strchr ((char *)inbuf + 2, ' ');
272
273 if (data)
274 {
275 *data++ = 0;
276 datalen = pkt_len - (data - (char *)inbuf);
277 }
278 else
279 {
280 data = (char *)inbuf + 2; // better read garbage than segfault
281 datalen = 0;
282 }
283
284 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
285 if (!strcmp ((char *)inbuf + 2, pkt->name))
286 {
287 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
288 queue_command (pkt, data, datalen);
173 else 289 else
290 execute (pkt, data, datalen);
291
292 goto next_packet;
293 }
294
295 // If we get here, we didn't find a valid command.
296 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
297
298next_packet:
299 inbuf [pkt_len] = save_byte; // rather ugly
300 skip_packet (pkt_len);
301
302 // input buffer has space again
303 socket_ev.poll (socket_ev.poll () | EV_READ);
304
305 return true;
306}
307
308// callback called when socket is either readable or writable
309void
310client::socket_cb (iow &w, int revents)
311{
312 //TODO remove when we have better socket cleanup logic
313 if (destroyed ())
314 {
315 socket_ev.poll (0);
316 return;
317 }
318
319 if (revents & EV_WRITE)
320 {
321 write_outputbuffer ();
322
323 if (!outputbuffer.len)
324 socket_ev.poll (socket_ev.poll () & ~EV_WRITE);
325 }
326
327 if (revents & EV_READ)
328 {
329 //TODO: rate-limit tcp connection in better ways, important
330
331 int amount = sizeof (inbuf) - inbuf_len;
332
333 if (!amount)
334 {
335 // input buffer full
336 socket_ev.poll (socket_ev.poll () & ~EV_READ);
337 return;
338 }
339
340 amount = read (fd, inbuf + inbuf_len, amount);
341
342 if (!amount)
343 {
344 destroy ();
345 return;
346 }
347 else if (amount < 0)
348 {
349 if (errno != EAGAIN && errno != EINTR)
174 { 350 {
175 LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); 351 LOG (llevError, "read error: %s\n", strerror (errno));
176 } 352 destroy ();
177 return -1; /* kick this user! */ 353 return;
178 } 354 }
179#else 355
180 if (errno != EAGAIN && errno !=EWOULDBLOCK) { 356 // should not be here, normally
181 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); 357 }
358 else
359 {
360 inbuf_len += amount;
361
362 if (handle_packet ())
363 {
364 while (handle_packet ())
365 ;
366
367 flush ();
182 } 368 }
183#endif
184 return 0; /*Error */
185 }
186 if (stat==0) return -1;
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
211 /* return error so the socket is closed */
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 } 369 }
234#else 370 }
235 if (errno != EAGAIN && errno !=EWOULDBLOCK) {
236 LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno));
237 }
238#endif
239 return 0; /*Error */
240 }
241 if (stat==0) return -1;
242 sl->len += stat;
243#ifdef CS_LOGSTATS
244 cst_tot.ibytes += stat;
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} 371}
256 372
257/******************************************************************************* 373/*******************************************************************************
258 * 374 *
259 * Start of write related routines. 375 * Start of write related routines.
… …
264 * Adds data to a socket buffer for whatever reason. 380 * Adds data to a socket buffer for whatever reason.
265 * 381 *
266 * ns is the socket we are adding the data to, buf is the start of the 382 * 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. 383 * data, and len is the number of bytes to add.
268 */ 384 */
269 385void
270static void add_to_buffer(NewSocket *ns, char *buf, int len) 386client::send (void *buf_, int len)
271{ 387{
388 char *buf = (char *)buf_;
389
390 if (destroyed () || !buf)
391 return;
392
393 if (len + outputbuffer.len > SOCKETBUFSIZE)
394 {
395 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
396 // shutdown the socket, this is safer than destroying it immediately
397 // as lots of code in the callchain might still access the map etc.
398 shutdown (fd, SHUT_RDWR);
399 return;
400 }
401
272 int avail, end; 402 int avail, end;
273 403
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 404 /* data + end is where we start putting the new data. The last byte
282 * currently in use is actually data + end -1 405 * currently in use is actually data + end -1
283 */ 406 */
284
285 end=ns->outputbuffer.start + ns->outputbuffer.len; 407 end = outputbuffer.start + outputbuffer.len;
286 /* The buffer is already in a wrapped state, so adjust end */ 408 /* The buffer is already in a wrapped state, so adjust end */
287 if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; 409 if (end >= SOCKETBUFSIZE)
410 end -= SOCKETBUFSIZE;
411
288 avail=SOCKETBUFSIZE - end; 412 avail = SOCKETBUFSIZE - end;
289 413
290 /* We can all fit it behind the current data without wrapping */ 414 /* We can all fit it behind the current data without wrapping */
291 if (avail >=len ) { 415 if (avail >= len)
292 memcpy(ns->outputbuffer.data + end, buf, len); 416 memcpy (outputbuffer.data + end, buf, len);
417 else
293 } 418 {
294 else {
295 memcpy(ns->outputbuffer.data + end, buf, avail); 419 memcpy (outputbuffer.data + end, buf, avail);
296 memcpy(ns->outputbuffer.data, buf+avail, len-avail); 420 memcpy (outputbuffer.data, buf + avail, len - avail);
297 } 421 }
422
298 ns->outputbuffer.len += len; 423 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} 424}
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
431 425
432/** 426/**
433 * Takes a string of data, and writes it out to the socket. A very handy 427 * Takes a string of data, and writes it out to the socket. A very handy
434 * shortcut function. 428 * shortcut function.
435 */ 429 */
436void cs_write_string(NewSocket *ns, const char *buf, int len) 430void
431client::send_packet (packet &sl)
437{ 432{
438 SockList sl; 433 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; 434 return;
458 435
459 if (msg->len >= MAXSOCKBUF) { 436 if (sl.length () > MAXSOCKBUF)
437 {
460 LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", 438 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 439 /* Almost certainly we've overflowed a buffer, so quit now to make
463 * it easier to debug. 440 * it easier to debug.
464 */ 441 */
465 abort(); 442 abort ();
443 }
444
445 if (!sl.length ())
446 return;
447
448 assert (sl.hdrlen == 2);
449
450 sl.buf_ [0] = sl.length () >> 8;
451 sl.buf_ [1] = sl.length () ;
452
453 send (sl.buf_, sl.length () + sl.hdrlen);
454}
455
456void
457client::send_packet (const char *buf, int len)
458{
459 packet sl;
460
461 sl << data (buf, len);
462 send_packet (sl);
463}
464
465void
466client::send_packet (const char *buf)
467{
468 send_packet (buf, strlen (buf));
469}
470
471void
472client::send_packet_printf (const char *format, ...)
473{
474 packet sl;
475
476 va_list ap;
477 va_start (ap, format);
478 sl.vprintf (format, ap);
479 va_end (ap);
480
481 send_packet (sl);
482}
483
484void
485client::send_msg (int color, const char *type, const char *msg)
486{
487 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
466 } 488 {
467 sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; 489 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
468 sbuf[1] = ((uint32)(msg->len)) & 0xFF; 490 return;
469 if (ns->status != Ns_Old) 491 }
470 Write_To_Socket(ns, (char *) sbuf, 2);
471 Write_To_Socket(ns, (char*)msg->buf, msg->len);
472}
473 492
474/** 493 int len = strlen (msg);
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;
481 494
482 sl.len = len; 495 if (!(color & NDI_VERBATIM)
483 sl.buf = (unsigned char*) buf; 496 && (msg_is_special (msg)
484 Send_With_Handling(ns, &sl); 497 || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)))
498 cfperl_send_msg (this, color, type, msg);
499 else
500 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
485} 501}
486 502
503void
504client::send_drawinfo (const char *msg, int flags)
505{
506 send_msg (flags, "log", msg);
507}
487 508
488/****************************************************************************** 509/***********************************************************************
489 * 510 *
490 * statistics logging functions. 511 * packet functions/utilities
491 * 512 *
492 ******************************************************************************/ 513 **********************************************************************/
493 514
494#ifdef CS_LOGSTATS 515packet::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{ 516{
505 time_t now=time(NULL); 517 reset ();
506 518
507 /* If no connections recently, don't both to log anything */ 519 int len = strlen (name);
508 if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; 520 memcpy (cur, name, len); cur += len;
509 521 *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} 522}
520#endif 523
524packet &packet::operator <<(const ber32 v)
525{
526 enum { maxlen = 32 / 7 + 1};
527 uint8 buf[maxlen];
528 uint8 *p = buf + maxlen;
529 uint32 val = v.val;
530
531 *--p = val & 0x7F;
532
533 while (val > 0x7F)
534 {
535 val >>= 7;
536 *--p = (val & 0x7F) | 0x80;
537 }
538
539 return *this << data (p, buf + maxlen - p);
540}
541
542packet &packet::operator <<(const data &v)
543{
544 if (room () < v.len)
545 reset ();
546 else
547 {
548 if (v.len)
549 {
550 memcpy (cur, v.ptr, v.len);
551 cur += v.len;
552 }
553 }
554
555 return *this;
556}
557
558packet &packet::operator <<(const data8 &v)
559{
560 unsigned int len = min (v.len, 0x00FF);
561 return *this << uint8 (len) << data (v.ptr, len);
562}
563
564packet &packet::operator <<(const data16 &v)
565{
566 unsigned int len = min (v.len, 0xFFFF);
567 return *this << uint16 (len) << data (v.ptr, len);
568}
569
570packet &packet::operator <<(const char *v)
571{
572 return *this << data (v, strlen (v ? v : 0));
573}
574
575void
576packet::vprintf (const char *format, va_list ap)
577{
578 int size = room ();
579
580 int len = vsnprintf ((char *)cur, size, format, ap);
581
582 if (len >= size)
583 return reset ();
584
585 cur += len;
586}
587

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