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/* |
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* CrossFire, A Multiplayer game for X-windows |
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* |
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* Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team |
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* Copyright (C) 1992 Frank Tore Johansen |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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* The author can be reached via e-mail to mark@pyramid.com |
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*/ |
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|
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/** |
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* \file |
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* Low-level socket-related functions. |
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* |
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* \date 2003-12-02 |
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* |
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* Contains some base functions that both the client and server |
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* can use. As such, depending what we are being compiled for will |
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* determine what we can include. the client is designed have |
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* CFCLIENT defined as part of its compile flags. |
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*/ |
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|
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using namespace std; |
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|
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#include <global.h> |
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#include <sproto.h> |
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#include <cstdarg> |
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|
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#ifdef __linux__ |
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# include <sys/types.h> |
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# include <sys/socket.h> |
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# include <netinet/in.h> |
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# include <netinet/tcp.h> |
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#endif |
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|
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// use a really low timeout, as it doesn't cost any bandwidth, and you can |
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// easily die in 20 seconds... |
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#define SOCKET_TIMEOUT1 10 * 1000 |
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#define SOCKET_TIMEOUT2 20 * 1000 |
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|
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void |
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client::flush () |
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{ |
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if (destroyed ()) |
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return; |
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|
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#ifdef __linux__ |
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// check time of last ack, and, if too old, kill connection |
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struct tcp_info tcpi; |
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socklen_t len = sizeof (tcpi); |
64 |
|
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if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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{ |
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unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
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|
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rtt = tcpi.tcpi_rtt; |
70 |
rttvar = tcpi.tcpi_rttvar; |
71 |
|
72 |
if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
73 |
&& SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
74 |
{ |
75 |
LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
76 |
(unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
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destroy (); |
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} |
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} |
80 |
#endif |
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|
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/** |
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* Writes data to socket. |
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* |
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* When the socket is clear to write, and we have backlogged data, this |
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* is called to write it out. |
87 |
*/ |
88 |
|
89 |
if (!outputbuffer.len || socket_ev.poll () & PE_W) |
90 |
return; |
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|
92 |
write_outputbuffer (); |
93 |
} |
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|
95 |
void |
96 |
client::write_outputbuffer () |
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{ |
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while (outputbuffer.len) |
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{ |
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int res = write (fd, outputbuffer.data + outputbuffer.start, |
101 |
min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); |
102 |
|
103 |
if (res > 0) |
104 |
{ |
105 |
outputbuffer.start += res; |
106 |
/* wrap back to start of buffer */ |
107 |
if (outputbuffer.start == SOCKETBUFSIZE) |
108 |
outputbuffer.start = 0; |
109 |
|
110 |
outputbuffer.len -= res; |
111 |
#ifdef CS_LOGSTATS |
112 |
cst_tot.obytes += res; |
113 |
cst_lst.obytes += res; |
114 |
#endif |
115 |
} |
116 |
else if (res == 0) |
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{ |
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LOG (llevError, "socket write failed, connection closed.\n"); |
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destroy (); |
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return; |
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} |
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else if (errno == EINTR) |
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{ |
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// just retry |
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} |
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else if (errno == EAGAIN) |
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{ |
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// delay till ready |
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socket_ev.poll (socket_ev.poll () | PE_W); |
130 |
socket_ev.start (); |
131 |
return; |
132 |
} |
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else |
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{ |
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LOG (llevError, "socket write failed: %s\n", strerror (errno)); |
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destroy (); |
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return; |
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} |
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} |
140 |
|
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socket_ev.poll (socket_ev.poll () & ~PE_W); |
142 |
} |
143 |
|
144 |
/****************************************************************************** |
145 |
* |
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* Start of read routines. |
147 |
* |
148 |
******************************************************************************/ |
149 |
|
150 |
int |
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client::next_packet () |
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{ |
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if (inbuf_len >= 2) |
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{ |
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int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
156 |
|
157 |
if (inbuf_len >= 2 + pkt_len) |
158 |
return 2 + pkt_len; |
159 |
|
160 |
if (inbuf_len == sizeof (inbuf)) |
161 |
{ |
162 |
send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
163 |
destroy (); |
164 |
return -1; |
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} |
166 |
} |
167 |
|
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return 0; |
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} |
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|
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void |
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client::skip_packet (int len) |
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{ |
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inbuf_len -= len; |
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memmove (inbuf, inbuf + len, inbuf_len); |
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} |
177 |
|
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/***************************************************************************** |
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* Start of command dispatch area. |
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* The commands here are protocol commands. |
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****************************************************************************/ |
182 |
|
183 |
// SocketCommand, PlayingCommand, should not exist with those ugly casts |
184 |
#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb), |
185 |
#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | |
186 |
|
187 |
/** |
188 |
* Dispatch table for the server. |
189 |
*/ |
190 |
static struct packet_type packets[] = { |
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{"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
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{"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
193 |
|
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{"examine", PC(ExamineCmd) PF_PLAYING }, |
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{"apply", PC(ApplyCmd) PF_PLAYING }, |
196 |
{"lookat", PC(LookAt) PF_PLAYING }, |
197 |
{"lock", PC(LockItem) PF_PLAYING }, |
198 |
{"mark", PC(MarkItem) PF_PLAYING }, |
199 |
{"move", PC(MoveCmd) PF_PLAYING }, |
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{"ext", PC(ExtCmd) 0 }, /* CF+ */ |
201 |
{"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ |
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{"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
203 |
|
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{"reply", SC(ReplyCmd) 0 }, |
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{"exti", SC(ExtiCmd) 0 }, /* CF+ */ |
206 |
{"addme", SC(AddMeCmd) 0 }, |
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{"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
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{"requestinfo", SC(RequestInfo) 0 }, |
209 |
{"setfacemode", SC(SetFaceMode) 0 }, |
210 |
{"setsound", SC(SetSound) 0 }, |
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{"setup", SC(SetUp) 0 }, |
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{"version", SC(VersionCmd) 0 }, |
213 |
{"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
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{"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
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{"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
216 |
}; |
217 |
|
218 |
bool |
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client::may_execute (const packet_type *pkt) const |
220 |
{ |
221 |
return (!(pkt->flags & PF_PLAYER) || pl) |
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&& (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
223 |
} |
224 |
|
225 |
// HACK: some commands currently should be executed |
226 |
// even when the player is frozen. this hack detects |
227 |
// those commands. it should be folded into may_execute, |
228 |
// but kept seperate to emphasise the hack aspect, i.e. |
229 |
// do it better, then remove. |
230 |
static bool |
231 |
always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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{ |
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if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
234 |
return false; |
235 |
|
236 |
if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
237 |
return false; |
238 |
|
239 |
if (pkt->flags & PF_COMMAND6) |
240 |
{ |
241 |
data += 6; |
242 |
len -= 6; |
243 |
} |
244 |
|
245 |
if (len > 4 && !strncmp (data, "say " , 4)) |
246 |
return true; |
247 |
if (len > 5 && !strncmp (data, "chat ", 5)) |
248 |
return true; |
249 |
|
250 |
return false; |
251 |
} |
252 |
|
253 |
void |
254 |
client::execute (const packet_type *pkt, char *data, int datalen) |
255 |
{ |
256 |
if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
257 |
{ |
258 |
//TODO: only one format |
259 |
if (pkt->flags & PF_PLAYER) |
260 |
((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
261 |
else |
262 |
((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
263 |
} |
264 |
else |
265 |
send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
266 |
} |
267 |
|
268 |
bool |
269 |
client::handle_packet () |
270 |
{ |
271 |
int pkt_len = next_packet (); |
272 |
|
273 |
if (!pkt_len) |
274 |
return false; |
275 |
else if (pkt_len < 0) |
276 |
{ |
277 |
LOG (llevError, "read error on player %s\n", |
278 |
pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
279 |
destroy (); |
280 |
return false; |
281 |
} |
282 |
|
283 |
inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
284 |
|
285 |
/* First, break out beginning word. There are at least |
286 |
* a few commands that do not have any paremeters. If |
287 |
* we get such a command, don't worry about trying |
288 |
* to break it up. |
289 |
*/ |
290 |
int datalen; |
291 |
char *data = strchr ((char *)inbuf + 2, ' '); |
292 |
|
293 |
if (data) |
294 |
{ |
295 |
*data++ = 0; |
296 |
datalen = pkt_len - (data - (char *)inbuf); |
297 |
} |
298 |
else |
299 |
{ |
300 |
data = (char *)inbuf + 2; // better read garbage than segfault |
301 |
datalen = 0; |
302 |
} |
303 |
|
304 |
for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
305 |
if (!strcmp ((char *)inbuf + 2, pkt->name)) |
306 |
{ |
307 |
if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
308 |
queue_command (pkt, data, datalen); |
309 |
else |
310 |
execute (pkt, data, datalen); |
311 |
|
312 |
goto next_packet; |
313 |
} |
314 |
|
315 |
// If we get here, we didn't find a valid command. |
316 |
send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
317 |
next_packet: |
318 |
skip_packet (pkt_len); |
319 |
|
320 |
// input buffer has space again |
321 |
socket_ev.poll (socket_ev.poll () | PE_R); |
322 |
|
323 |
return true; |
324 |
} |
325 |
|
326 |
// callback called when socket is either readable or writable |
327 |
void |
328 |
client::socket_cb (iow &w, int got) |
329 |
{ |
330 |
//TODO remove when we have better socket cleanup logic |
331 |
if (destroyed ()) |
332 |
{ |
333 |
socket_ev.poll (0); |
334 |
return; |
335 |
} |
336 |
|
337 |
if (got & PE_W) |
338 |
{ |
339 |
write_outputbuffer (); |
340 |
|
341 |
if (!outputbuffer.len) |
342 |
socket_ev.poll (socket_ev.poll () & ~PE_W); |
343 |
} |
344 |
|
345 |
if (got & PE_R) |
346 |
{ |
347 |
//TODO: rate-limit tcp connection in better ways, important |
348 |
|
349 |
int amount = sizeof (inbuf) - inbuf_len; |
350 |
|
351 |
if (!amount) |
352 |
{ |
353 |
// input buffer full |
354 |
socket_ev.poll (socket_ev.poll () & ~PE_R); |
355 |
return; |
356 |
} |
357 |
|
358 |
amount = read (fd, inbuf + inbuf_len, amount); |
359 |
|
360 |
if (!amount) |
361 |
{ |
362 |
destroy (); |
363 |
return; |
364 |
} |
365 |
else if (amount < 0) |
366 |
{ |
367 |
if (errno != EAGAIN && errno != EINTR) |
368 |
{ |
369 |
LOG (llevError, "read error: %s\n", strerror (errno)); |
370 |
destroy (); |
371 |
return; |
372 |
} |
373 |
|
374 |
// should not be here, normally |
375 |
} |
376 |
else |
377 |
{ |
378 |
inbuf_len += amount; |
379 |
|
380 |
cst_tot.ibytes += amount; |
381 |
cst_lst.ibytes += amount; |
382 |
|
383 |
cmd_ev.start (); |
384 |
} |
385 |
} |
386 |
} |
387 |
|
388 |
// called whenever we have additional commands to process |
389 |
void |
390 |
client::cmd_cb (iw &w) |
391 |
{ |
392 |
if (handle_packet ()) |
393 |
w.start (); |
394 |
else |
395 |
flush (); |
396 |
} |
397 |
|
398 |
/******************************************************************************* |
399 |
* |
400 |
* Start of write related routines. |
401 |
* |
402 |
******************************************************************************/ |
403 |
|
404 |
/** |
405 |
* Adds data to a socket buffer for whatever reason. |
406 |
* |
407 |
* ns is the socket we are adding the data to, buf is the start of the |
408 |
* data, and len is the number of bytes to add. |
409 |
*/ |
410 |
void |
411 |
client::send (void *buf_, int len) |
412 |
{ |
413 |
char *buf = (char *)buf_; |
414 |
|
415 |
if (destroyed () || !buf) |
416 |
return; |
417 |
|
418 |
if (len + outputbuffer.len > SOCKETBUFSIZE) |
419 |
{ |
420 |
LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
421 |
destroy (); |
422 |
return; |
423 |
} |
424 |
|
425 |
int avail, end; |
426 |
|
427 |
/* data + end is where we start putting the new data. The last byte |
428 |
* currently in use is actually data + end -1 |
429 |
*/ |
430 |
end = outputbuffer.start + outputbuffer.len; |
431 |
/* The buffer is already in a wrapped state, so adjust end */ |
432 |
if (end >= SOCKETBUFSIZE) |
433 |
end -= SOCKETBUFSIZE; |
434 |
|
435 |
avail = SOCKETBUFSIZE - end; |
436 |
|
437 |
/* We can all fit it behind the current data without wrapping */ |
438 |
if (avail >= len) |
439 |
memcpy (outputbuffer.data + end, buf, len); |
440 |
else |
441 |
{ |
442 |
memcpy (outputbuffer.data + end, buf, avail); |
443 |
memcpy (outputbuffer.data, buf + avail, len - avail); |
444 |
} |
445 |
|
446 |
outputbuffer.len += len; |
447 |
} |
448 |
|
449 |
/** |
450 |
* Takes a string of data, and writes it out to the socket. A very handy |
451 |
* shortcut function. |
452 |
*/ |
453 |
void |
454 |
client::send_packet (packet &sl) |
455 |
{ |
456 |
if (destroyed ()) |
457 |
return; |
458 |
|
459 |
if (sl.length () >= MAXSOCKBUF) |
460 |
{ |
461 |
LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
462 |
/* Almost certainly we've overflowed a buffer, so quit now to make |
463 |
* it easier to debug. |
464 |
*/ |
465 |
abort (); |
466 |
} |
467 |
|
468 |
if (!sl.length ()) |
469 |
return; |
470 |
|
471 |
assert (sl.hdrlen == 2); |
472 |
|
473 |
sl.buf_ [0] = sl.length () >> 8; |
474 |
sl.buf_ [1] = sl.length () ; |
475 |
|
476 |
send (sl.buf_, sl.length () + sl.hdrlen); |
477 |
} |
478 |
|
479 |
void |
480 |
client::send_packet (const char *buf, int len) |
481 |
{ |
482 |
packet sl; |
483 |
|
484 |
sl << data (buf, len); |
485 |
send_packet (sl); |
486 |
} |
487 |
|
488 |
void |
489 |
client::send_packet (const char *buf) |
490 |
{ |
491 |
send_packet (buf, strlen (buf)); |
492 |
} |
493 |
|
494 |
void |
495 |
client::send_packet_printf (const char *format, ...) |
496 |
{ |
497 |
packet sl; |
498 |
|
499 |
va_list ap; |
500 |
va_start (ap, format); |
501 |
sl.vprintf (format, ap); |
502 |
va_end (ap); |
503 |
|
504 |
send_packet (sl); |
505 |
} |
506 |
|
507 |
/*********************************************************************** |
508 |
* |
509 |
* packet functions/utilities |
510 |
* |
511 |
**********************************************************************/ |
512 |
|
513 |
packet::packet (const char *name) |
514 |
{ |
515 |
reset (); |
516 |
|
517 |
int len = strlen (name); |
518 |
memcpy (cur, name, len); cur += len; |
519 |
*cur++ = ' '; |
520 |
} |
521 |
|
522 |
packet &packet::operator <<(const data &v) |
523 |
{ |
524 |
if (room () < v.len) |
525 |
reset (); |
526 |
else |
527 |
{ |
528 |
if (v.len) |
529 |
{ |
530 |
memcpy (cur, v.ptr, v.len); |
531 |
cur += v.len; |
532 |
} |
533 |
} |
534 |
|
535 |
return *this; |
536 |
} |
537 |
|
538 |
packet &packet::operator <<(const data8 &v) |
539 |
{ |
540 |
unsigned int len = min (v.len, 0x00FF); |
541 |
return *this << uint8 (len) << data (v.ptr, len); |
542 |
} |
543 |
|
544 |
packet &packet::operator <<(const data16 &v) |
545 |
{ |
546 |
unsigned int len = min (v.len, 0xFFFF); |
547 |
return *this << uint16 (len) << data (v.ptr, len); |
548 |
} |
549 |
|
550 |
packet &packet::operator <<(const char *v) |
551 |
{ |
552 |
return *this << data (v, strlen (v ? v : 0)); |
553 |
} |
554 |
|
555 |
void |
556 |
packet::vprintf (const char *format, va_list ap) |
557 |
{ |
558 |
int size = room (); |
559 |
|
560 |
int len = vsnprintf ((char *)cur, size, format, ap); |
561 |
|
562 |
if (len >= size) |
563 |
return reset (); |
564 |
|
565 |
cur += len; |
566 |
} |
567 |
|
568 |
/****************************************************************************** |
569 |
* |
570 |
* statistics logging functions. |
571 |
* |
572 |
******************************************************************************/ |
573 |
|
574 |
#ifdef CS_LOGSTATS |
575 |
|
576 |
/* cst_tot is for the life of the server, cst_last is for the last series of |
577 |
* stats |
578 |
*/ |
579 |
CS_Stats cst_tot, cst_lst; |
580 |
|
581 |
/** |
582 |
* Writes out the gathered stats. We clear cst_lst. |
583 |
*/ |
584 |
void |
585 |
write_cs_stats (void) |
586 |
{ |
587 |
time_t now = time (NULL); |
588 |
|
589 |
/* If no connections recently, don't both to log anything */ |
590 |
if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
591 |
return; |
592 |
|
593 |
/* CSSTAT is put in so scripts can easily find the line */ |
594 |
LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
595 |
ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
596 |
now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
597 |
cst_lst.ibytes = 0; |
598 |
cst_lst.obytes = 0; |
599 |
cst_lst.time_start = now; |
600 |
} |
601 |
#endif |
602 |
|