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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.14 by root, Thu Dec 14 01:21:58 2006 UTC vs.
Revision 1.54 by root, Sun Jul 29 02:24:34 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3 3 *
4 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
4 Copyright (C) 1992 Frank Tore Johansen 5 * Copyright (©) 1992,2007 Frank Tore Johansen
5 6 *
6 This program is free software; you can redistribute it and/or modify 7 * Crossfire TRT is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by 8 * it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or 9 * the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version. 10 * (at your option) any later version.
10 11 *
11 This program is distributed in the hope that it will be useful, 12 * This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details. 15 * GNU General Public License for more details.
15 16 *
16 You should have received a copy of the GNU General Public License 17 * You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software 18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20 The author can be reached via e-mail to mark@pyramid.com
21*/
22
23/**
24 * \file
25 * Low-level socket-related functions.
26 * 19 *
27 * \date 2003-12-02 20 * The authors can be reached via e-mail to <crossfire@schmorp.de>
28 *
29 * Contains some base functions that both the client and server
30 * can use. As such, depending what we are being compiled for will
31 * determine what we can include. the client is designed have
32 * CFCLIENT defined as part of its compile flags.
33 */ 21 */
34 22
35using namespace std; 23using namespace std;
36 24
37#include <global.h> 25#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 26#include <sproto.h>
40#include <cstdarg> 27#include <cstdarg>
41 28
42#ifdef __linux__ 29#if HAVE_TCP_INFO
43# include <sys/types.h> 30# include <sys/types.h>
44# include <sys/socket.h> 31# include <sys/socket.h>
45# include <netinet/in.h> 32# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 33# include <netinet/tcp.h>
48#endif 34#endif
49 35
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 36// disconnect a socket after this many seconds without an ack
51// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 37#define SOCKET_TIMEOUT 8.
53#define SOCKET_TIMEOUT2 20
54 38
39// force a packet when idle for more than this many seconds,
40// forcing an ack regularly.
41#define IDLE_PING 2.
42
55void 43void
56Socket_Flush (NewSocket * ns) 44client::flush ()
57{ 45{
58#ifdef __linux__ 46 if (destroyed ())
47 return;
48
49#if HAVE_TCP_INFO
59 // check time of last ack, and, if too old, kill connection 50 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 51 socklen_t len = sizeof (tcpi);
62 52
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 53 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd,
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead;
73 }
74 } 54 {
55 if (tcpi.tcpi_snd_mss)
56 mss = tcpi.tcpi_snd_mss;
75 57
76 int val; 58#if 0
77 59 fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n",
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 60 tcpi.tcpi_unacked,
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 61 tcpi.tcpi_sacked,
62 tcpi.tcpi_lost,
63 tcpi.tcpi_retrans,
64 tcpi.tcpi_fackets,
65 tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss,
66
67 tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked));
80#endif 68#endif
81}
82 69
83/*********************************************************************** 70 // do this only when player is active
84 * 71 if (pl && pl->active
85 * packet functions/utilities 72 && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000))
86 * 73 {
87 **********************************************************************/ 74 send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)");
75 write_outputbuffer ();
88 76
89packet &packet::operator <<(const data &v) 77 LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
90{ 78 (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked);
91 if (v.len) 79 destroy ();
80 }
92 { 81 }
93 memcpy (buf + len, v.ptr, v.len); 82#endif
94 len += v.len; 83
84 /**
85 * Writes data to socket.
86 *
87 * When the socket is clear to write, and we have backlogged data, this
88 * is called to write it out.
89 */
90
91 // write a nop to the socket at least every IDLE_NOP seconds.
92 if (!outputbuffer.len)
95 } 93 {
94 if (last_send + IDLE_PING <= NOW && pl && pl->active)
95 {
96 // this is a bit ugly, but map1/map1a seem to be the only
97 // nop'able commands and they are quite small.
98 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
99 send_packet (sl);
100 }
101 else
102 return;
103 }
96 104
97 return *this; 105 if (socket_ev.poll () & PE_W)
98} 106 return;
99 107
100packet &packet::operator <<(const data8 &v) 108 last_send = NOW;
101{ 109 write_outputbuffer ();
102 unsigned int len = min (v.len, 0x00FF);
103 return *this << uint8 (len) << data (v.ptr, len);
104} 110}
105 111
106packet &packet::operator <<(const data16 &v)
107{
108 unsigned int len = min (v.len, 0xFFFF);
109 return *this << uint16 (len) << data (v.ptr, len);
110}
111
112packet &packet::operator <<(const char *v)
113{
114 return *this << data (v, strlen (v ? v : 0));
115}
116
117void 112void
118packet::printf (const char *format, ...) 113client::write_outputbuffer ()
119{ 114{
120 va_list ap; 115 while (outputbuffer.len)
121 va_start (ap, format); 116 {
117 int res = write (fd, outputbuffer.data + outputbuffer.start,
118 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
122 119
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap); 120 if (res > 0)
121 {
122 outputbuffer.start += res;
123 /* wrap back to start of buffer */
124 if (outputbuffer.start == SOCKETBUFSIZE)
125 outputbuffer.start = 0;
124 126
125 va_end (ap); 127 outputbuffer.len -= res;
128 }
129 else if (res == 0)
130 {
131 LOG (llevError, "socket write failed, connection closed.\n");
132 destroy ();
133 return;
134 }
135 else if (errno == EINTR)
136 {
137 // just retry
138 }
139 else if (errno == EAGAIN)
140 {
141 // delay till ready
142 socket_ev.poll (socket_ev.poll () | PE_W);
143 socket_ev.start ();
144 return;
145 }
146 else
147 {
148 LOG (llevError, "socket write failed: %s\n", strerror (errno));
149 destroy ();
150 return;
151 }
152 }
153
154 socket_ev.poll (socket_ev.poll () & ~PE_W);
126} 155}
127 156
128/****************************************************************************** 157/******************************************************************************
129 * 158 *
130 * Start of read routines. 159 * Start of read routines.
131 * 160 *
132 ******************************************************************************/ 161 ******************************************************************************/
133 162
134int 163int
135NewSocket::read_packet () 164client::next_packet ()
136{ 165{
137 for (;;)
138 {
139 if (inbuf_len >= 2) 166 if (inbuf_len >= 2)
140 { 167 {
141 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 168 int pkt_len = (inbuf [0] << 8) | inbuf [1];
142 169
143 if (inbuf_len >= 2 + pkt_len) 170 if (inbuf_len >= 2 + pkt_len)
144 return pkt_len + 2; 171 return 2 + pkt_len;
172
173 if (inbuf_len == sizeof (inbuf))
145 } 174 {
175 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY);
176 destroy ();
177 return -1;
178 }
179 }
180
181 return 0;
182}
183
184void
185client::skip_packet (int len)
186{
187 inbuf_len -= len;
188 memmove (inbuf, inbuf + len, inbuf_len);
189}
190
191/*****************************************************************************
192 * Start of command dispatch area.
193 * The commands here are protocol commands.
194 ****************************************************************************/
195
196// SocketCommand, PlayingCommand, should not exist with those ugly casts
197#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
198#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
199
200/**
201 * Dispatch table for the server.
202 */
203static struct packet_type packets[] = {
204 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
205 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
206
207 {"examine", PC(ExamineCmd) PF_PLAYING },
208 {"ex", PC(ExCmd) PF_PLAYING },
209 {"apply", PC(ApplyCmd) PF_PLAYING },
210 {"lookat", PC(LookAt) PF_PLAYING },
211 {"lock", PC(LockItem) PF_PLAYING },
212 {"mark", PC(MarkItem) PF_PLAYING },
213 {"move", PC(MoveCmd) PF_PLAYING },
214 {"ext", PC(ExtCmd) 0 }, // CF+
215 {"mapredraw", PC(MapRedrawCmd) 0 },
216 {"mapinfo", PC(MapInfoCmd) 0 }, // CF+
217
218 {"reply", SC(ReplyCmd) 0 },
219 {"exti", SC(ExtiCmd) 0 }, // CF+
220 {"addme", SC(AddMeCmd) 0 },
221 {"askface", SC(AskFaceCmd) 0 },
222 {"requestinfo", SC(RequestInfo) 0 },
223 {"setfacemode", SC(SetFaceMode) 0 },
224 {"setsound", SC(SetSound) 0 },
225 {"setup", SC(SetUp) 0 },
226 {"version", SC(VersionCmd) 0 },
227 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
228 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
229 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
230};
231
232bool
233client::may_execute (const packet_type *pkt) const
234{
235 return (!(pkt->flags & PF_PLAYER) || pl)
236 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
237}
238
239// HACK: some commands currently should be executed
240// even when the player is frozen. this hack detects
241// those commands. it should be folded into may_execute,
242// but kept seperate to emphasise the hack aspect, i.e.
243// do it better, then remove.
244static bool
245always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
246{
247 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
248 return false;
249
250 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
251 return false;
252
253 if (pkt->flags & PF_COMMAND6)
254 {
255 data += 6;
256 len -= 6;
257 }
258
259 if (len > 4 && !strncmp (data, "say " , 4))
260 return true;
261 if (len > 5 && !strncmp (data, "chat ", 5))
262 return true;
263
264 return false;
265}
266
267void
268client::execute (const packet_type *pkt, char *data, int datalen)
269{
270 if (may_execute (pkt) || always_immediate (this, pkt, data, datalen))
271 {
272 //TODO: only one format
273 if (pkt->flags & PF_PLAYER)
274 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
275 else
276 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
277 }
278 else
279 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
280}
281
282bool
283client::handle_packet ()
284{
285 int pkt_len = next_packet ();
286
287 if (!pkt_len)
288 return false;
289 else if (pkt_len < 0)
290 {
291 LOG (llevError, "read error on player %s\n",
292 pl && pl->ob ? &pl->ob->name : "[anonymous]");
293 destroy ();
294 return false;
295 }
296
297 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
298
299 /* First, break out beginning word. There are at least
300 * a few commands that do not have any paremeters. If
301 * we get such a command, don't worry about trying
302 * to break it up.
303 */
304 int datalen;
305 char *data = strchr ((char *)inbuf + 2, ' ');
306
307 if (data)
308 {
309 *data++ = 0;
310 datalen = pkt_len - (data - (char *)inbuf);
311 }
312 else
313 {
314 data = (char *)inbuf + 2; // better read garbage than segfault
315 datalen = 0;
316 }
317
318 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
319 if (!strcmp ((char *)inbuf + 2, pkt->name))
320 {
321 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
322 queue_command (pkt, data, datalen);
323 else
324 execute (pkt, data, datalen);
325
326 goto next_packet;
327 }
328
329 // If we get here, we didn't find a valid command.
330 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
331next_packet:
332 skip_packet (pkt_len);
333
334 // input buffer has space again
335 socket_ev.poll (socket_ev.poll () | PE_R);
336
337 return true;
338}
339
340// callback called when socket is either readable or writable
341void
342client::socket_cb (iow &w, int got)
343{
344 //TODO remove when we have better socket cleanup logic
345 if (destroyed ())
346 {
347 socket_ev.poll (0);
348 return;
349 }
350
351 if (got & PE_W)
352 {
353 write_outputbuffer ();
354
355 if (!outputbuffer.len)
356 socket_ev.poll (socket_ev.poll () & ~PE_W);
357 }
358
359 if (got & PE_R)
360 {
361 //TODO: rate-limit tcp connection in better ways, important
146 362
147 int amount = sizeof (inbuf) - inbuf_len; 363 int amount = sizeof (inbuf) - inbuf_len;
148 364
149 if (amount <= 0) 365 if (!amount)
150 { 366 {
151 LOG (llevError, "packet too large");//TODO 367 // input buffer full
368 socket_ev.poll (socket_ev.poll () & ~PE_R);
152 return -1; 369 return;
153 } 370 }
154 371
155 amount = read (fd, inbuf + inbuf_len, amount); 372 amount = read (fd, inbuf + inbuf_len, amount);
156 373
157 if (!amount) 374 if (!amount)
158 { 375 {
159 status = Ns_Dead; 376 destroy ();
160 return -1; 377 return;
161 } 378 }
162 else if (amount < 0) 379 else if (amount < 0)
163 { 380 {
164 if (errno != EAGAIN && errno != EINTR) 381 if (errno != EAGAIN && errno != EINTR)
165 { 382 {
166 LOG (llevError, "read error: %s", strerror (errno)); 383 LOG (llevError, "read error: %s\n", strerror (errno));
384 destroy ();
167 return -1; 385 return;
168 } 386 }
169 387
170 return 0; 388 // should not be here, normally
389 }
390 else
171 } 391 {
172
173 inbuf_len += amount; 392 inbuf_len += amount;
174 393
175 cst_tot.ibytes += amount; 394 cmd_ev.start ();
176 cst_lst.ibytes += amount; 395 }
177 } 396 }
178} 397}
179 398
399// called whenever we have additional commands to process
180void 400void
181NewSocket::skip_packet (int len) 401client::cmd_cb (iw &w)
182{ 402{
183 inbuf_len -= len; 403 if (handle_packet ())
184 memmove (inbuf, inbuf + len, inbuf_len); 404 w.start ();
405 else
406 flush ();
185} 407}
186 408
187/******************************************************************************* 409/*******************************************************************************
188 * 410 *
189 * Start of write related routines. 411 * Start of write related routines.
… …
194 * Adds data to a socket buffer for whatever reason. 416 * Adds data to a socket buffer for whatever reason.
195 * 417 *
196 * ns is the socket we are adding the data to, buf is the start of the 418 * ns is the socket we are adding the data to, buf is the start of the
197 * data, and len is the number of bytes to add. 419 * data, and len is the number of bytes to add.
198 */ 420 */
199 421void
200static void 422client::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 423{
424 char *buf = (char *)buf_;
425
426 if (destroyed () || !buf)
427 return;
428
429 if (len + outputbuffer.len > SOCKETBUFSIZE)
430 {
431 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
432 // shutdown the socket, this is safer than destroying it immediately
433 // as lots of code in the callchain might still access the map etc.
434 shutdown (fd, SHUT_RDWR);
435 return;
436 }
437
203 int avail, end; 438 int avail, end;
204
205 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
206 {
207 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
208 ns->status = Ns_Dead;
209 return;
210 }
211 439
212 /* data + end is where we start putting the new data. The last byte 440 /* data + end is where we start putting the new data. The last byte
213 * currently in use is actually data + end -1 441 * currently in use is actually data + end -1
214 */ 442 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 443 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 444 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 445 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 446 end -= SOCKETBUFSIZE;
220 447
221 avail = SOCKETBUFSIZE - end; 448 avail = SOCKETBUFSIZE - end;
222 449
223 /* We can all fit it behind the current data without wrapping */ 450 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 451 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 452 memcpy (outputbuffer.data + end, buf, len);
226 else 453 else
227 { 454 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 455 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 456 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 457 }
231 458
232 ns->outputbuffer.len += len; 459 outputbuffer.len += len;
233#if 0
234 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
235#endif
236}
237
238/**
239 * Writes data to socket.
240 *
241 * When the socket is clear to write, and we have backlogged data, this
242 * is called to write it out.
243 */
244void
245write_socket_buffer (NewSocket * ns)
246{
247 int amt, max;
248
249 if (ns->outputbuffer.len == 0)
250 {
251 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
252 return;
253 }
254
255 do
256 {
257 max = SOCKETBUFSIZE - ns->outputbuffer.start;
258 if (ns->outputbuffer.len < max)
259 max = ns->outputbuffer.len;
260
261 do
262 {
263 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
264 }
265 while ((amt < 0) && (errno == EINTR));
266
267 if (amt < 0)
268 { /* We got an error */
269
270 if (errno != EWOULDBLOCK)
271 {
272 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
273 ns->status = Ns_Dead;
274 return;
275 }
276 else
277 { /* EWOULDBLOCK */
278 /* can't write it, so store it away. */
279 ns->can_write = 0;
280 return;
281 }
282 }
283 ns->outputbuffer.start += amt;
284 /* wrap back to start of buffer */
285 if (ns->outputbuffer.start == SOCKETBUFSIZE)
286 ns->outputbuffer.start = 0;
287 ns->outputbuffer.len -= amt;
288#ifdef CS_LOGSTATS
289 cst_tot.obytes += amt;
290 cst_lst.obytes += amt;
291#endif
292 }
293 while (ns->outputbuffer.len > 0);
294}
295
296/**
297 * This writes data to the socket. - It is very low level -
298 * all we try and do is write out the data to the socket
299 * provided (ns). buf is the data to write, len is the number
300 * of bytes to write. IT doesn't return anything - rather, it
301 * updates the ns structure if we get an error.
302 */
303void
304Write_To_Socket (NewSocket * ns, char *buf, int len)
305{
306 int amt = 0;
307 char *pos = buf;
308
309 if (ns->status == Ns_Dead || !buf)
310 {
311 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
312 return;
313 }
314
315#ifndef __GNU__ /* This caused problems on Hurd */
316 if (!ns->can_write)
317 {
318 add_to_buffer (ns, buf, len);
319 return;
320 }
321#endif
322 /* If we manage to write more than we wanted, take it as a bonus */
323 while (len > 0)
324 {
325
326 do
327 {
328 amt = write (ns->fd, pos, len);
329 }
330 while ((amt < 0) && (errno == EINTR));
331
332 if (amt < 0)
333 { /* We got an error */
334 if (errno != EWOULDBLOCK)
335 {
336 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
337 errno, strerror (errno));
338 ns->status = Ns_Dead;
339 return;
340 }
341 else
342 { /* EWOULDBLOCK */
343 /* can't write it, so store it away. */
344 add_to_buffer (ns, pos, len);
345 ns->can_write = 0;
346 return;
347 }
348 }
349 /* amt gets set to 0 above in blocking code, so we do this as
350 * an else if to make sure we don't reprocess it.
351 */
352 else if (amt == 0)
353 {
354 LOG (llevError, "Write_To_Socket: No data written out.\n");
355 }
356 len -= amt;
357 pos += amt;
358#ifdef CS_LOGSTATS
359 cst_tot.obytes += amt;
360 cst_lst.obytes += amt;
361#endif
362 }
363} 460}
364 461
365/** 462/**
366 * Takes a string of data, and writes it out to the socket. A very handy 463 * Takes a string of data, and writes it out to the socket. A very handy
367 * shortcut function. 464 * shortcut function.
368 */ 465 */
369
370void 466void
371NewSocket::send_packet (packet &sl) 467client::send_packet (packet &sl)
372{ 468{
373 Send_With_Handling (this, &sl); 469 if (destroyed ())
374}
375
376void
377NewSocket::send_packet (const char *buf, int len)
378{
379 packet sl;
380
381 sl << data (buf, len);
382 send_packet (sl);
383}
384
385void
386NewSocket::send_packet (const char *buf)
387{
388 send_packet (buf, strlen (buf));
389}
390
391/**
392 * Calls Write_To_Socket to send data to the client.
393 *
394 * The only difference in this function is that we take a packet
395 *, and we prepend the length information.
396 */
397void
398Send_With_Handling (NewSocket *ns, packet *msg)
399{
400 unsigned char sbuf[4];
401
402 if (ns->status == Ns_Dead || !msg)
403 return; 470 return;
404 471
405 if (msg->len >= MAXSOCKBUF) 472 if (sl.length () >= MAXSOCKBUF)
406 { 473 {
407 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 474 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
408 /* Almost certainly we've overflowed a buffer, so quite now to make 475 /* Almost certainly we've overflowed a buffer, so quit now to make
409 * it easier to debug. 476 * it easier to debug.
410 */ 477 */
411 abort (); 478 abort ();
412 } 479 }
413 sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF;
414 sbuf[1] = ((uint32) (msg->len)) & 0xFF;
415 if (ns->status != Ns_Old)
416 Write_To_Socket (ns, (char *) sbuf, 2);
417 Write_To_Socket (ns, (char *) msg->buf, msg->len);
418}
419 480
481 if (!sl.length ())
482 return;
483
484 assert (sl.hdrlen == 2);
485
486 sl.buf_ [0] = sl.length () >> 8;
487 sl.buf_ [1] = sl.length () ;
488
489 send (sl.buf_, sl.length () + sl.hdrlen);
490}
491
492void
493client::send_packet (const char *buf, int len)
494{
495 packet sl;
496
497 sl << data (buf, len);
498 send_packet (sl);
499}
500
501void
502client::send_packet (const char *buf)
503{
504 send_packet (buf, strlen (buf));
505}
506
507void
508client::send_packet_printf (const char *format, ...)
509{
510 packet sl;
511
512 va_list ap;
513 va_start (ap, format);
514 sl.vprintf (format, ap);
515 va_end (ap);
516
517 send_packet (sl);
518}
519
520// returns true when the message needs special (read: perl) treatment
521static bool
522msg_is_special (const char *msg)
523{
524 return msg [strcspn (msg, "<[&\n")];
525}
526
527void
528client::send_msg (int color, const char *type, const char *msg)
529{
530 if (msg_is_special (msg))
531 cfperl_send_msg (this, color, type, msg);
532 else if (can_msg)
533 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
534 else if (color < 0)
535 return; // client cannot handle this
536 else
537 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
538}
539
540void
541client::send_drawinfo (const char *msg, int flags)
542{
543 send_msg (flags, "log", msg);
544}
545
420/****************************************************************************** 546/***********************************************************************
421 * 547 *
422 * statistics logging functions. 548 * packet functions/utilities
423 * 549 *
424 ******************************************************************************/ 550 **********************************************************************/
425 551
426#ifdef CS_LOGSTATS 552packet::packet (const char *name)
427
428/* cst_tot is for the life of the server, cst_last is for the last series of
429 * stats
430 */
431CS_Stats cst_tot, cst_lst;
432
433/**
434 * Writes out the gathered stats. We clear cst_lst.
435 */
436void
437write_cs_stats (void)
438{ 553{
439 time_t now = time (NULL); 554 reset ();
440 555
441 /* If no connections recently, don't both to log anything */ 556 int len = strlen (name);
442 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) 557 memcpy (cur, name, len); cur += len;
443 return; 558 *cur++ = ' ';
444
445 /* CSSTAT is put in so scripts can easily find the line */
446 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
447 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
448 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
449 cst_lst.ibytes = 0;
450 cst_lst.obytes = 0;
451 cst_lst.max_conn = socket_info.nconns;
452 cst_lst.time_start = now;
453} 559}
454#endif
455 560
561packet &packet::operator <<(const ber32 v)
562{
563 enum { maxlen = 32 / 7 + 1};
564 uint8 buf[maxlen];
565 uint8 *p = buf + maxlen;
566 uint32 val = v.val;
567
568 *--p = val & 0x7F;
569
570 while (val > 0x7F)
571 {
572 val >>= 7;
573 *--p = (val & 0x7F) | 0x80;
574 }
575
576 return *this << data (p, buf + maxlen - p);
577}
578
579packet &packet::operator <<(const data &v)
580{
581 if (room () < v.len)
582 reset ();
583 else
584 {
585 if (v.len)
586 {
587 memcpy (cur, v.ptr, v.len);
588 cur += v.len;
589 }
590 }
591
592 return *this;
593}
594
595packet &packet::operator <<(const data8 &v)
596{
597 unsigned int len = min (v.len, 0x00FF);
598 return *this << uint8 (len) << data (v.ptr, len);
599}
600
601packet &packet::operator <<(const data16 &v)
602{
603 unsigned int len = min (v.len, 0xFFFF);
604 return *this << uint16 (len) << data (v.ptr, len);
605}
606
607packet &packet::operator <<(const char *v)
608{
609 return *this << data (v, strlen (v ? v : 0));
610}
611
612void
613packet::vprintf (const char *format, va_list ap)
614{
615 int size = room ();
616
617 int len = vsnprintf ((char *)cur, size, format, ap);
618
619 if (len >= size)
620 return reset ();
621
622 cur += len;
623}
624

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