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Revision 1.16 by root, Thu Dec 14 02:37:37 2006 UTC vs.
Revision 1.60 by root, Mon Oct 1 01:09:10 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// force a packet when idle for more than this many seconds,
51// easily die in 20 seconds... 37// forcing an ack regularly.
52#define SOCKET_TIMEOUT1 10 38#define IDLE_PING 2.
53#define SOCKET_TIMEOUT2 20
54 39
55void 40void
56Socket_Flush (client_socket * ns) 41client::flush ()
57{ 42{
58#ifdef __linux__ 43 if (destroyed ())
59 // check time of last ack, and, if too old, kill connection 44 return;
60 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi);
62 45
63 if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 46 /**
64 { 47 * Writes data to socket.
65 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 */
66 52
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 53 // write a nop to the socket at least every IDLE_NOP seconds.
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 54 if (!outputbuffer.len)
69 { 55 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, 56 if (last_send + IDLE_PING <= NOW && pl && pl->active)
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 ns->status = Ns_Dead;
73 } 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 () & PE_W)
68 return;
69
70 last_send = NOW;
71 write_outputbuffer ();
72}
73
74void
75client::write_outputbuffer ()
76{
77 while (outputbuffer.len)
74 } 78 {
79 int res = write (fd, outputbuffer.data + outputbuffer.start,
80 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
75 81
76 int val; 82 if (res > 0)
83 {
84 outputbuffer.start += res;
85 /* wrap back to start of buffer */
86 if (outputbuffer.start == SOCKETBUFSIZE)
87 outputbuffer.start = 0;
77 88
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 89 outputbuffer.len -= res;
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 90 }
80#endif 91 else if (res == 0)
81} 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 () | PE_W);
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 }
82 115
116 socket_ev.poll (socket_ev.poll () & ~PE_W);
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
83/*********************************************************************** 153/*****************************************************************************
84 * 154 * Start of command dispatch area.
85 * packet functions/utilities 155 * The commands here are protocol commands.
86 *
87 **********************************************************************/ 156 ****************************************************************************/
88 157
89packet &packet::operator <<(const data &v) 158// SocketCommand, PlayingCommand, should not exist with those ugly casts
159#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
160#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
161
162/**
163 * Dispatch table for the server.
164 */
165static struct packet_type packets[] = {
166 {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 },
167 {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 },
168
169 {"examine", PC(ExamineCmd) PF_PLAYING },
170 {"ex", PC(ExCmd) PF_PLAYING },
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+
179
180 {"reply", SC(ReplyCmd) 0 },
181 {"exti", SC(ExtiCmd) 0 }, // CF+
182 {"addme", SC(AddMeCmd) 0 },
183 {"askface", SC(AskFaceCmd) 0 },
184 {"requestinfo", SC(RequestInfo) 0 },
185 {"setfacemode", SC(SetFaceMode) 0 },
186 {"setsound", SC(SetSound) 0 },
187 {"setup", SC(SetUp) 0 },
188 {"version", SC(VersionCmd) 0 },
189 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
190 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
191 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
192};
193
194bool
195client::may_execute (const packet_type *pkt) const
90{ 196{
91 if (room () < v.len) 197 return (!(pkt->flags & PF_PLAYER) || pl)
92 reset (); 198 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
199}
200
201// HACK: some commands currently should be executed
202// even when the player is frozen. this hack detects
203// those commands. it should be folded into may_execute,
204// but kept seperate to emphasise the hack aspect, i.e.
205// do it better, then remove.
206static bool
207always_immediate (const client *ns, const packet_type *pkt, const char *data, int len)
208{
209 if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6)))
210 return false;
211
212 if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map)
213 return false;
214
215 if (pkt->flags & PF_COMMAND6)
216 {
217 data += 6;
218 len -= 6;
219 }
220
221 if (len > 4 && !strncmp (data, "say " , 4))
222 return true;
223 if (len > 5 && !strncmp (data, "chat ", 5))
224 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)
236 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
237 else
238 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
239 }
93 else 240 else
241 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name);
242}
243
244bool
245client::handle_packet ()
246{
247 int pkt_len = next_packet ();
248
249 if (!pkt_len)
250 return false;
251 else if (pkt_len < 0)
252 {
253 LOG (llevError, "read error on player %s\n",
254 pl && pl->ob ? &pl->ob->name : "[anonymous]");
255 destroy ();
256 return false;
94 { 257 }
95 if (v.len) 258
259 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
260
261 /* First, break out beginning word. There are at least
262 * a few commands that do not have any paremeters. If
263 * we get such a command, don't worry about trying
264 * to break it up.
265 */
266 int datalen;
267 char *data = strchr ((char *)inbuf + 2, ' ');
268
269 if (data)
270 {
271 *data++ = 0;
272 datalen = pkt_len - (data - (char *)inbuf);
273 }
274 else
275 {
276 data = (char *)inbuf + 2; // better read garbage than segfault
277 datalen = 0;
278 }
279
280 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
281 if (!strcmp ((char *)inbuf + 2, pkt->name))
96 { 282 {
97 memcpy (cur, v.ptr, v.len); 283 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
98 cur += v.len; 284 queue_command (pkt, data, datalen);
285 else
286 execute (pkt, data, datalen);
287
288 goto next_packet;
99 } 289 }
290
291 // If we get here, we didn't find a valid command.
292 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2);
293next_packet:
294 skip_packet (pkt_len);
295
296 // input buffer has space again
297 socket_ev.poll (socket_ev.poll () | PE_R);
298
299 return true;
300}
301
302// callback called when socket is either readable or writable
303void
304client::socket_cb (iow &w, int got)
305{
306 //TODO remove when we have better socket cleanup logic
307 if (destroyed ())
100 } 308 {
101 309 socket_ev.poll (0);
102 return *this; 310 return;
103}
104
105packet &packet::operator <<(const data8 &v)
106{
107 unsigned int len = min (v.len, 0x00FF);
108 return *this << uint8 (len) << data (v.ptr, len);
109}
110
111packet &packet::operator <<(const data16 &v)
112{
113 unsigned int len = min (v.len, 0xFFFF);
114 return *this << uint16 (len) << data (v.ptr, len);
115}
116
117packet &packet::operator <<(const char *v)
118{
119 return *this << data (v, strlen (v ? v : 0));
120}
121
122void
123packet::printf (const char *format, ...)
124{
125 int size = room ();
126
127 va_list ap;
128 va_start (ap, format);
129 int len = vsnprintf ((char *)cur, size, format, ap);
130 va_end (ap);
131
132 if (len >= size)
133 return reset ();
134
135 cur += len;
136}
137
138/******************************************************************************
139 *
140 * Start of read routines.
141 *
142 ******************************************************************************/
143
144int
145client_socket::read_packet ()
146{
147 for (;;)
148 { 311 }
149 if (inbuf_len >= 2)
150 {
151 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
152 312
153 if (inbuf_len >= 2 + pkt_len) 313 if (got & PE_W)
154 return pkt_len + 2; 314 {
155 } 315 write_outputbuffer ();
316
317 if (!outputbuffer.len)
318 socket_ev.poll (socket_ev.poll () & ~PE_W);
319 }
320
321 if (got & PE_R)
322 {
323 //TODO: rate-limit tcp connection in better ways, important
156 324
157 int amount = sizeof (inbuf) - inbuf_len; 325 int amount = sizeof (inbuf) - inbuf_len;
158 326
159 if (amount <= 0) 327 if (!amount)
160 { 328 {
161 LOG (llevError, "packet too large");//TODO 329 // input buffer full
330 socket_ev.poll (socket_ev.poll () & ~PE_R);
162 return -1; 331 return;
163 } 332 }
164 333
165 amount = read (fd, inbuf + inbuf_len, amount); 334 amount = read (fd, inbuf + inbuf_len, amount);
166 335
167 if (!amount) 336 if (!amount)
168 { 337 {
169 status = Ns_Dead; 338 destroy ();
170 return -1; 339 return;
171 } 340 }
172 else if (amount < 0) 341 else if (amount < 0)
173 { 342 {
174 if (errno != EAGAIN && errno != EINTR) 343 if (errno != EAGAIN && errno != EINTR)
175 { 344 {
176 LOG (llevError, "read error: %s", strerror (errno)); 345 LOG (llevError, "read error: %s\n", strerror (errno));
346 destroy ();
177 return -1; 347 return;
178 } 348 }
179 349
180 return 0; 350 // should not be here, normally
351 }
352 else
181 } 353 {
182
183 inbuf_len += amount; 354 inbuf_len += amount;
184 355
185 cst_tot.ibytes += amount; 356 if (handle_packet ())
186 cst_lst.ibytes += amount; 357 {
187 } 358 while (handle_packet ())
188} 359 ;
189 360
190void 361 flush ();
191client_socket::skip_packet (int len) 362 }
192{ 363 }
193 inbuf_len -= len; 364 }
194 memmove (inbuf, inbuf + len, inbuf_len);
195} 365}
196 366
197/******************************************************************************* 367/*******************************************************************************
198 * 368 *
199 * Start of write related routines. 369 * Start of write related routines.
204 * Adds data to a socket buffer for whatever reason. 374 * Adds data to a socket buffer for whatever reason.
205 * 375 *
206 * ns is the socket we are adding the data to, buf is the start of the 376 * ns is the socket we are adding the data to, buf is the start of the
207 * data, and len is the number of bytes to add. 377 * data, and len is the number of bytes to add.
208 */ 378 */
209 379void
210static void 380client::send (void *buf_, int len)
211add_to_buffer (client_socket *ns, char *buf, int len)
212{ 381{
382 char *buf = (char *)buf_;
383
384 if (destroyed () || !buf)
385 return;
386
387 if (len + outputbuffer.len > SOCKETBUFSIZE)
388 {
389 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
390 // shutdown the socket, this is safer than destroying it immediately
391 // as lots of code in the callchain might still access the map etc.
392 shutdown (fd, SHUT_RDWR);
393 return;
394 }
395
213 int avail, end; 396 int avail, end;
214
215 if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE)
216 {
217 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd);
218 ns->status = Ns_Dead;
219 return;
220 }
221 397
222 /* data + end is where we start putting the new data. The last byte 398 /* data + end is where we start putting the new data. The last byte
223 * currently in use is actually data + end -1 399 * currently in use is actually data + end -1
224 */ 400 */
225
226 end = ns->outputbuffer.start + ns->outputbuffer.len; 401 end = outputbuffer.start + outputbuffer.len;
227 /* The buffer is already in a wrapped state, so adjust end */ 402 /* The buffer is already in a wrapped state, so adjust end */
228 if (end >= SOCKETBUFSIZE) 403 if (end >= SOCKETBUFSIZE)
229 end -= SOCKETBUFSIZE; 404 end -= SOCKETBUFSIZE;
230 405
231 avail = SOCKETBUFSIZE - end; 406 avail = SOCKETBUFSIZE - end;
232 407
233 /* We can all fit it behind the current data without wrapping */ 408 /* We can all fit it behind the current data without wrapping */
234 if (avail >= len) 409 if (avail >= len)
235 memcpy (ns->outputbuffer.data + end, buf, len); 410 memcpy (outputbuffer.data + end, buf, len);
236 else 411 else
237 { 412 {
238 memcpy (ns->outputbuffer.data + end, buf, avail); 413 memcpy (outputbuffer.data + end, buf, avail);
239 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 414 memcpy (outputbuffer.data, buf + avail, len - avail);
240 } 415 }
241 416
242 ns->outputbuffer.len += len; 417 outputbuffer.len += len;
243#if 0
244 LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start);
245#endif
246}
247
248/**
249 * Writes data to socket.
250 *
251 * When the socket is clear to write, and we have backlogged data, this
252 * is called to write it out.
253 */
254void
255write_socket_buffer (client_socket * ns)
256{
257 int amt, max;
258
259 if (ns->outputbuffer.len == 0)
260 {
261 LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd);
262 return;
263 }
264
265 do
266 {
267 max = SOCKETBUFSIZE - ns->outputbuffer.start;
268 if (ns->outputbuffer.len < max)
269 max = ns->outputbuffer.len;
270
271 do
272 {
273 amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max);
274 }
275 while ((amt < 0) && (errno == EINTR));
276
277 if (amt < 0)
278 { /* We got an error */
279
280 if (errno != EWOULDBLOCK)
281 {
282 LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno));
283 ns->status = Ns_Dead;
284 return;
285 }
286 else
287 { /* EWOULDBLOCK */
288 /* can't write it, so store it away. */
289 ns->can_write = 0;
290 return;
291 }
292 }
293 ns->outputbuffer.start += amt;
294 /* wrap back to start of buffer */
295 if (ns->outputbuffer.start == SOCKETBUFSIZE)
296 ns->outputbuffer.start = 0;
297 ns->outputbuffer.len -= amt;
298#ifdef CS_LOGSTATS
299 cst_tot.obytes += amt;
300 cst_lst.obytes += amt;
301#endif
302 }
303 while (ns->outputbuffer.len > 0);
304}
305
306/**
307 * This writes data to the socket. - It is very low level -
308 * all we try and do is write out the data to the socket
309 * provided (ns). buf is the data to write, len is the number
310 * of bytes to write. IT doesn't return anything - rather, it
311 * updates the ns structure if we get an error.
312 */
313void
314client_socket::send (void *buf_, int len)
315{
316 char *buf = (char *)buf_;
317 char *pos = buf;
318 int amt = 0;
319
320 if (status == Ns_Dead || !buf)
321 {
322 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
323 return;
324 }
325
326#ifndef __GNU__ /* This caused problems on Hurd */
327 if (!can_write)
328 {
329 add_to_buffer (this, buf, len);
330 return;
331 }
332#endif
333
334 /* If we manage to write more than we wanted, take it as a bonus */
335 while (len > 0)
336 {
337 do
338 {
339 amt = write (fd, pos, len);
340 }
341 while ((amt < 0) && (errno == EINTR));
342
343 if (amt < 0)
344 { /* We got an error */
345 if (errno != EWOULDBLOCK)
346 {
347 LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */
348 errno, strerror (errno));
349 status = Ns_Dead;
350 return;
351 }
352 else
353 { /* EWOULDBLOCK */
354 /* can't write it, so store it away. */
355 add_to_buffer (this, pos, len);
356 can_write = 0;
357 return;
358 }
359 }
360 /* amt gets set to 0 above in blocking code, so we do this as
361 * an else if to make sure we don't reprocess it.
362 */
363 else if (amt == 0)
364 LOG (llevError, "Write_To_Socket: No data written out.\n");
365
366 len -= amt;
367 pos += amt;
368#ifdef CS_LOGSTATS
369 cst_tot.obytes += amt;
370 cst_lst.obytes += amt;
371#endif
372 }
373} 418}
374 419
375/** 420/**
376 * Takes a string of data, and writes it out to the socket. A very handy 421 * Takes a string of data, and writes it out to the socket. A very handy
377 * shortcut function. 422 * shortcut function.
378 */ 423 */
379
380void 424void
381client_socket::send_packet (packet &sl) 425client::send_packet (packet &sl)
382{ 426{
383 Send_With_Handling (this, &sl); 427 if (destroyed ())
384}
385
386void
387client_socket::send_packet (const char *buf, int len)
388{
389 packet sl;
390
391 sl << data (buf, len);
392 send_packet (sl);
393}
394
395void
396client_socket::send_packet (const char *buf)
397{
398 send_packet (buf, strlen (buf));
399}
400
401/**
402 * Calls Write_To_Socket to send data to the client.
403 *
404 * The only difference in this function is that we take a packet
405 *, and we prepend the length information.
406 */
407void
408Send_With_Handling (client_socket *ns, packet *msg)
409{
410 unsigned char sbuf[4];
411
412 if (ns->status == Ns_Dead || !msg)
413 return; 428 return;
414 429
415 if (msg->length () >= MAXSOCKBUF) 430 if (sl.length () > MAXSOCKBUF)
416 { 431 {
417 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->length ()); 432 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
418 /* Almost certainly we've overflowed a buffer, so quite now to make 433 /* Almost certainly we've overflowed a buffer, so quit now to make
419 * it easier to debug. 434 * it easier to debug.
420 */ 435 */
421 abort (); 436 abort ();
422 } 437 }
423 438
424 sbuf[0] = ((uint32) (msg->length ()) >> 8); 439 if (!sl.length ())
425 sbuf[1] = ((uint32) (msg->length ()) );
426
427 if (ns->status != Ns_Old)
428 ns->send (sbuf, 2);
429
430 ns->send (msg->buf, msg->length ());
431}
432
433/******************************************************************************
434 *
435 * statistics logging functions.
436 *
437 ******************************************************************************/
438
439#ifdef CS_LOGSTATS
440
441/* cst_tot is for the life of the server, cst_last is for the last series of
442 * stats
443 */
444CS_Stats cst_tot, cst_lst;
445
446/**
447 * Writes out the gathered stats. We clear cst_lst.
448 */
449void
450write_cs_stats (void)
451{
452 time_t now = time (NULL);
453
454 /* If no connections recently, don't both to log anything */
455 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
456 return; 440 return;
457 441
458 /* CSSTAT is put in so scripts can easily find the line */ 442 assert (sl.hdrlen == 2);
459 LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n",
460 ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn,
461 now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start);
462 cst_lst.ibytes = 0;
463 cst_lst.obytes = 0;
464 cst_lst.max_conn = socket_info.nconns;
465 cst_lst.time_start = now;
466}
467#endif
468 443
444 sl.buf_ [0] = sl.length () >> 8;
445 sl.buf_ [1] = sl.length () ;
446
447 send (sl.buf_, sl.length () + sl.hdrlen);
448}
449
450void
451client::send_packet (const char *buf, int len)
452{
453 packet sl;
454
455 sl << data (buf, len);
456 send_packet (sl);
457}
458
459void
460client::send_packet (const char *buf)
461{
462 send_packet (buf, strlen (buf));
463}
464
465void
466client::send_packet_printf (const char *format, ...)
467{
468 packet sl;
469
470 va_list ap;
471 va_start (ap, format);
472 sl.vprintf (format, ap);
473 va_end (ap);
474
475 send_packet (sl);
476}
477
478// returns true when the message needs special (read: perl) treatment
479static bool
480msg_is_special (const char *msg)
481{
482 return msg [strcspn (msg, "<[&\n")];
483}
484
485void
486client::send_msg (int color, const char *type, const char *msg)
487{
488 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
489 {
490 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
491 return;
492 }
493
494 int len = strlen (msg);
495
496 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
497 cfperl_send_msg (this, color, type, msg);
498 else if (can_msg)
499 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
500 else if (color < 0)
501 return; // client cannot handle this
502 else
503 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
504}
505
506void
507client::send_drawinfo (const char *msg, int flags)
508{
509 send_msg (flags, "log", msg);
510}
511
512/***********************************************************************
513 *
514 * packet functions/utilities
515 *
516 **********************************************************************/
517
518packet::packet (const char *name)
519{
520 reset ();
521
522 int len = strlen (name);
523 memcpy (cur, name, len); cur += len;
524 *cur++ = ' ';
525}
526
527packet &packet::operator <<(const ber32 v)
528{
529 enum { maxlen = 32 / 7 + 1};
530 uint8 buf[maxlen];
531 uint8 *p = buf + maxlen;
532 uint32 val = v.val;
533
534 *--p = val & 0x7F;
535
536 while (val > 0x7F)
537 {
538 val >>= 7;
539 *--p = (val & 0x7F) | 0x80;
540 }
541
542 return *this << data (p, buf + maxlen - p);
543}
544
545packet &packet::operator <<(const data &v)
546{
547 if (room () < v.len)
548 reset ();
549 else
550 {
551 if (v.len)
552 {
553 memcpy (cur, v.ptr, v.len);
554 cur += v.len;
555 }
556 }
557
558 return *this;
559}
560
561packet &packet::operator <<(const data8 &v)
562{
563 unsigned int len = min (v.len, 0x00FF);
564 return *this << uint8 (len) << data (v.ptr, len);
565}
566
567packet &packet::operator <<(const data16 &v)
568{
569 unsigned int len = min (v.len, 0xFFFF);
570 return *this << uint16 (len) << data (v.ptr, len);
571}
572
573packet &packet::operator <<(const char *v)
574{
575 return *this << data (v, strlen (v ? v : 0));
576}
577
578void
579packet::vprintf (const char *format, va_list ap)
580{
581 int size = room ();
582
583 int len = vsnprintf ((char *)cur, size, format, ap);
584
585 if (len >= size)
586 return reset ();
587
588 cur += len;
589}
590

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