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Revision 1.14 by root, Thu Dec 14 01:21:58 2006 UTC vs.
Revision 1.59 by root, Sun Sep 30 20:22:25 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 (NewSocket * 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 {
74 } 58 // this is a bit ugly, but map1/map1a seem to be the only
75 59 // nop'able commands and they are quite small.
76 int val; 60 packet sl (mapmode == Map1Cmd ? "map1" : "map1a");
77 61 send_packet (sl);
78 val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 62 }
79 val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); 63 else
80#endif 64 return;
81}
82
83/***********************************************************************
84 *
85 * packet functions/utilities
86 *
87 **********************************************************************/
88
89packet &packet::operator <<(const data &v)
90{
91 if (v.len)
92 { 65 }
93 memcpy (buf + len, v.ptr, v.len); 66
94 len += v.len; 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)
95 } 78 {
79 int res = write (fd, outputbuffer.data + outputbuffer.start,
80 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
96 81
97 return *this; 82 if (res > 0)
98} 83 {
84 outputbuffer.start += res;
85 /* wrap back to start of buffer */
86 if (outputbuffer.start == SOCKETBUFSIZE)
87 outputbuffer.start = 0;
99 88
100packet &packet::operator <<(const data8 &v) 89 outputbuffer.len -= res;
101{ 90 }
102 unsigned int len = min (v.len, 0x00FF); 91 else if (res == 0)
103 return *this << uint8 (len) << data (v.ptr, len); 92 {
104} 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 }
105 115
106packet &packet::operator <<(const data16 &v) 116 socket_ev.poll (socket_ev.poll () & ~PE_W);
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
118packet::printf (const char *format, ...)
119{
120 va_list ap;
121 va_start (ap, format);
122
123 len += vsnprintf ((char *)buf + len, MAXSOCKBUF, format, ap);
124
125 va_end (ap);
126} 117}
127 118
128/****************************************************************************** 119/******************************************************************************
129 * 120 *
130 * Start of read routines. 121 * Start of read routines.
131 * 122 *
132 ******************************************************************************/ 123 ******************************************************************************/
133 124
134int 125int
135NewSocket::read_packet () 126client::next_packet ()
136{ 127{
137 for (;;)
138 {
139 if (inbuf_len >= 2) 128 if (inbuf_len >= 2)
140 { 129 {
141 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1]; 130 int pkt_len = (inbuf [0] << 8) | inbuf [1];
142 131
143 if (inbuf_len >= 2 + pkt_len) 132 if (inbuf_len >= 2 + pkt_len)
144 return pkt_len + 2; 133 return 2 + pkt_len;
134
135 if (inbuf_len == sizeof (inbuf))
145 } 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
153/*****************************************************************************
154 * Start of command dispatch area.
155 * The commands here are protocol commands.
156 ****************************************************************************/
157
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
196{
197 return (!(pkt->flags & PF_PLAYER) || pl)
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 }
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;
257 }
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))
282 {
283 if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen))
284 queue_command (pkt, data, datalen);
285 else
286 execute (pkt, data, datalen);
287
288 goto next_packet;
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 ())
308 {
309 socket_ev.poll (0);
310 return;
311 }
312
313 if (got & PE_W)
314 {
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
146 324
147 int amount = sizeof (inbuf) - inbuf_len; 325 int amount = sizeof (inbuf) - inbuf_len;
148 326
149 if (amount <= 0) 327 if (!amount)
150 { 328 {
151 LOG (llevError, "packet too large");//TODO 329 // input buffer full
330 socket_ev.poll (socket_ev.poll () & ~PE_R);
152 return -1; 331 return;
153 } 332 }
154 333
155 amount = read (fd, inbuf + inbuf_len, amount); 334 amount = read (fd, inbuf + inbuf_len, amount);
156 335
157 if (!amount) 336 if (!amount)
158 { 337 {
159 status = Ns_Dead; 338 destroy ();
160 return -1; 339 return;
161 } 340 }
162 else if (amount < 0) 341 else if (amount < 0)
163 { 342 {
164 if (errno != EAGAIN && errno != EINTR) 343 if (errno != EAGAIN && errno != EINTR)
165 { 344 {
166 LOG (llevError, "read error: %s", strerror (errno)); 345 LOG (llevError, "read error: %s\n", strerror (errno));
346 destroy ();
167 return -1; 347 return;
168 } 348 }
169 349
170 return 0; 350 // should not be here, normally
351 }
352 else
171 } 353 {
172
173 inbuf_len += amount; 354 inbuf_len += amount;
174 355
175 cst_tot.ibytes += amount; 356 cmd_ev.start ();
176 cst_lst.ibytes += amount; 357 }
177 } 358 }
178} 359}
179 360
361// called whenever we have additional commands to process
180void 362void
181NewSocket::skip_packet (int len) 363client::cmd_cb (iw &w)
182{ 364{
183 inbuf_len -= len; 365 if (handle_packet ())
184 memmove (inbuf, inbuf + len, inbuf_len); 366 w.start ();
367 else
368 flush ();
185} 369}
186 370
187/******************************************************************************* 371/*******************************************************************************
188 * 372 *
189 * Start of write related routines. 373 * Start of write related routines.
194 * Adds data to a socket buffer for whatever reason. 378 * Adds data to a socket buffer for whatever reason.
195 * 379 *
196 * ns is the socket we are adding the data to, buf is the start of the 380 * 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. 381 * data, and len is the number of bytes to add.
198 */ 382 */
199 383void
200static void 384client::send (void *buf_, int len)
201add_to_buffer (NewSocket *ns, char *buf, int len)
202{ 385{
386 char *buf = (char *)buf_;
387
388 if (destroyed () || !buf)
389 return;
390
391 if (len + outputbuffer.len > SOCKETBUFSIZE)
392 {
393 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
394 // shutdown the socket, this is safer than destroying it immediately
395 // as lots of code in the callchain might still access the map etc.
396 shutdown (fd, SHUT_RDWR);
397 return;
398 }
399
203 int avail, end; 400 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 }
211 401
212 /* data + end is where we start putting the new data. The last byte 402 /* data + end is where we start putting the new data. The last byte
213 * currently in use is actually data + end -1 403 * currently in use is actually data + end -1
214 */ 404 */
215
216 end = ns->outputbuffer.start + ns->outputbuffer.len; 405 end = outputbuffer.start + outputbuffer.len;
217 /* The buffer is already in a wrapped state, so adjust end */ 406 /* The buffer is already in a wrapped state, so adjust end */
218 if (end >= SOCKETBUFSIZE) 407 if (end >= SOCKETBUFSIZE)
219 end -= SOCKETBUFSIZE; 408 end -= SOCKETBUFSIZE;
220 409
221 avail = SOCKETBUFSIZE - end; 410 avail = SOCKETBUFSIZE - end;
222 411
223 /* We can all fit it behind the current data without wrapping */ 412 /* We can all fit it behind the current data without wrapping */
224 if (avail >= len) 413 if (avail >= len)
225 memcpy (ns->outputbuffer.data + end, buf, len); 414 memcpy (outputbuffer.data + end, buf, len);
226 else 415 else
227 { 416 {
228 memcpy (ns->outputbuffer.data + end, buf, avail); 417 memcpy (outputbuffer.data + end, buf, avail);
229 memcpy (ns->outputbuffer.data, buf + avail, len - avail); 418 memcpy (outputbuffer.data, buf + avail, len - avail);
230 } 419 }
231 420
232 ns->outputbuffer.len += len; 421 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} 422}
364 423
365/** 424/**
366 * Takes a string of data, and writes it out to the socket. A very handy 425 * Takes a string of data, and writes it out to the socket. A very handy
367 * shortcut function. 426 * shortcut function.
368 */ 427 */
369
370void 428void
371NewSocket::send_packet (packet &sl) 429client::send_packet (packet &sl)
372{ 430{
373 Send_With_Handling (this, &sl); 431 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; 432 return;
404 433
405 if (msg->len >= MAXSOCKBUF) 434 if (sl.length () > MAXSOCKBUF)
406 { 435 {
407 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); 436 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 437 /* Almost certainly we've overflowed a buffer, so quit now to make
409 * it easier to debug. 438 * it easier to debug.
410 */ 439 */
411 abort (); 440 abort ();
412 } 441 }
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}
419 442
420/****************************************************************************** 443 if (!sl.length ())
421 *
422 * statistics logging functions.
423 *
424 ******************************************************************************/
425
426#ifdef CS_LOGSTATS
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{
439 time_t now = time (NULL);
440
441 /* If no connections recently, don't both to log anything */
442 if (cst_lst.ibytes == 0 && cst_lst.obytes == 0)
443 return; 444 return;
444 445
445 /* CSSTAT is put in so scripts can easily find the line */ 446 assert (sl.hdrlen == 2);
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}
454#endif
455 447
448 sl.buf_ [0] = sl.length () >> 8;
449 sl.buf_ [1] = sl.length () ;
450
451 send (sl.buf_, sl.length () + sl.hdrlen);
452}
453
454void
455client::send_packet (const char *buf, int len)
456{
457 packet sl;
458
459 sl << data (buf, len);
460 send_packet (sl);
461}
462
463void
464client::send_packet (const char *buf)
465{
466 send_packet (buf, strlen (buf));
467}
468
469void
470client::send_packet_printf (const char *format, ...)
471{
472 packet sl;
473
474 va_list ap;
475 va_start (ap, format);
476 sl.vprintf (format, ap);
477 va_end (ap);
478
479 send_packet (sl);
480}
481
482// returns true when the message needs special (read: perl) treatment
483static bool
484msg_is_special (const char *msg)
485{
486 return msg [strcspn (msg, "<[&\n")];
487}
488
489void
490client::send_msg (int color, const char *type, const char *msg)
491{
492 if (!msg || !type) // it can happen (for example, missing attack messages cause this)
493 {
494 LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg);
495 return;
496 }
497
498 int len = strlen (msg);
499
500 if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128))
501 cfperl_send_msg (this, color, type, msg);
502 else if (can_msg)
503 send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg);
504 else if (color < 0)
505 return; // client cannot handle this
506 else
507 send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg);
508}
509
510void
511client::send_drawinfo (const char *msg, int flags)
512{
513 send_msg (flags, "log", msg);
514}
515
516/***********************************************************************
517 *
518 * packet functions/utilities
519 *
520 **********************************************************************/
521
522packet::packet (const char *name)
523{
524 reset ();
525
526 int len = strlen (name);
527 memcpy (cur, name, len); cur += len;
528 *cur++ = ' ';
529}
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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