1 | /* |
1 | /* |
2 | CrossFire, A Multiplayer game for X-windows |
2 | * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
3 | |
3 | * |
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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. |
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19 | |
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20 | The author can be reached via e-mail to mark@pyramid.com |
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21 | */ |
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22 | |
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23 | /** |
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24 | * \file |
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25 | * Low-level socket-related functions. |
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26 | * |
19 | * |
27 | * \date 2003-12-02 |
20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
28 | * |
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29 | * Contains some base functions that both the client and server |
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30 | * can use. As such, depending what we are being compiled for will |
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31 | * determine what we can include. the client is designed have |
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32 | * CFCLIENT defined as part of its compile flags. |
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33 | */ |
21 | */ |
34 | |
22 | |
35 | using namespace std; |
23 | using namespace std; |
36 | |
24 | |
37 | #include <global.h> |
25 | #include <global.h> |
38 | #include <sproto.h> |
26 | #include <sproto.h> |
39 | #include <cstdarg> |
27 | #include <cstdarg> |
40 | |
28 | |
41 | #ifdef __linux__ |
29 | #if HAVE_TCP_INFO |
42 | # include <sys/types.h> |
30 | # include <sys/types.h> |
43 | # include <sys/socket.h> |
31 | # include <sys/socket.h> |
44 | # include <netinet/in.h> |
32 | # include <netinet/in.h> |
45 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
46 | #endif |
34 | #endif |
47 | |
35 | |
48 | // 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 |
49 | // easily die in 20 seconds... |
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50 | #define SOCKET_TIMEOUT1 10 * 1000 |
37 | #define SOCKET_TIMEOUT 8. |
51 | #define SOCKET_TIMEOUT2 20 * 1000 |
38 | |
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39 | // force a packet when idle for more than this many seconds, |
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40 | // forcing an ack regularly. |
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41 | #define IDLE_PING 2. |
52 | |
42 | |
53 | void |
43 | void |
54 | client::flush () |
44 | client::flush () |
55 | { |
45 | { |
56 | #ifdef __linux__ |
46 | if (destroyed ()) |
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47 | return; |
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48 | |
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49 | #if HAVE_TCP_INFO |
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50 | // check about once per second, spread evenly over all clients |
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51 | // do this only when player is active |
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52 | if (!((pticks + fd) & 7) && pl && pl->active) |
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53 | { |
57 | // check time of last ack, and, if too old, kill connection |
54 | // check time of last ack, and, if too old, kill connection |
58 | struct tcp_info tcpi; |
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59 | socklen_t len = sizeof (tcpi); |
55 | socklen_t len = sizeof (tcpi); |
60 | |
56 | |
61 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
57 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
62 | { |
58 | { |
63 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
59 | if (tcpi.tcpi_snd_mss) |
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60 | mss = tcpi.tcpi_snd_mss; |
64 | |
61 | |
65 | rtt = tcpi.tcpi_rtt; |
62 | fprintf (stderr, "uack %d sst %d cwnd %d mss %d pmtu %d\n", |
66 | rttvar = tcpi.tcpi_rttvar; |
63 | tcpi.tcpi_unacked, tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu); |
67 | |
64 | |
68 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
65 | if (tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
69 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
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70 | { |
66 | { |
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67 | send_msg (NDI_RED, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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68 | write_outputbuffer (); |
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69 | |
71 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
70 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
72 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
71 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
73 | destroy (); |
72 | destroy (); |
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73 | } |
74 | } |
74 | } |
75 | } |
75 | } |
76 | #endif |
76 | #endif |
77 | |
77 | |
78 | /** |
78 | /** |
… | |
… | |
80 | * |
80 | * |
81 | * When the socket is clear to write, and we have backlogged data, this |
81 | * When the socket is clear to write, and we have backlogged data, this |
82 | * is called to write it out. |
82 | * is called to write it out. |
83 | */ |
83 | */ |
84 | |
84 | |
85 | if (!outputbuffer.len || socket_ev.poll () & PE_W) |
85 | // write a nop to the socket at least every IDLE_NOP seconds. |
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86 | if (!outputbuffer.len) |
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87 | { |
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88 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
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89 | { |
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90 | // this is a bit ugly, but map1/map1a seem to be the only |
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91 | // nop'able commands and they are quite small. |
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92 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
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93 | send_packet (sl); |
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94 | } |
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95 | else |
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96 | return; |
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97 | } |
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98 | |
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99 | if (socket_ev.poll () & PE_W) |
86 | return; |
100 | return; |
87 | |
101 | |
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102 | last_send = NOW; |
88 | write_outputbuffer (); |
103 | write_outputbuffer (); |
89 | } |
104 | } |
90 | |
105 | |
91 | void |
106 | void |
92 | client::write_outputbuffer () |
107 | client::write_outputbuffer () |
… | |
… | |
102 | /* wrap back to start of buffer */ |
117 | /* wrap back to start of buffer */ |
103 | if (outputbuffer.start == SOCKETBUFSIZE) |
118 | if (outputbuffer.start == SOCKETBUFSIZE) |
104 | outputbuffer.start = 0; |
119 | outputbuffer.start = 0; |
105 | |
120 | |
106 | outputbuffer.len -= res; |
121 | outputbuffer.len -= res; |
107 | #ifdef CS_LOGSTATS |
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108 | cst_tot.obytes += res; |
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109 | cst_lst.obytes += res; |
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110 | #endif |
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111 | } |
122 | } |
112 | else if (res == 0) |
123 | else if (res == 0) |
113 | { |
124 | { |
114 | LOG (llevError, "socket write failed, connection closed.\n"); |
125 | LOG (llevError, "socket write failed, connection closed.\n"); |
115 | destroy (); |
126 | destroy (); |
… | |
… | |
182 | |
193 | |
183 | /** |
194 | /** |
184 | * Dispatch table for the server. |
195 | * Dispatch table for the server. |
185 | */ |
196 | */ |
186 | static struct packet_type packets[] = { |
197 | static struct packet_type packets[] = { |
187 | {"ncom", PC(NewPlayerCmd) PF_PLAYING }, |
198 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
188 | {"command", PC(PlayerCmd) PF_PLAYING }, |
199 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
189 | |
200 | |
190 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
201 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
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202 | {"ex", PC(ExCmd) PF_PLAYING }, |
191 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
203 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
192 | {"lookat", PC(LookAt) PF_PLAYING }, |
204 | {"lookat", PC(LookAt) PF_PLAYING }, |
193 | {"lock", PC(LockItem) PF_PLAYING }, |
205 | {"lock", PC(LockItem) PF_PLAYING }, |
194 | {"mark", PC(MarkItem) PF_PLAYING }, |
206 | {"mark", PC(MarkItem) PF_PLAYING }, |
195 | {"move", PC(MoveCmd) PF_PLAYING }, |
207 | {"move", PC(MoveCmd) PF_PLAYING }, |
196 | {"ext", PC(ExtCmd) 0 }, /* CF+ */ |
208 | {"ext", PC(ExtCmd) 0 }, // CF+ |
197 | {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ |
209 | {"mapredraw", PC(MapRedrawCmd) 0 }, |
198 | {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
210 | {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
199 | |
211 | |
200 | {"reply", SC(ReplyCmd) 0 }, |
212 | {"reply", SC(ReplyCmd) 0 }, |
201 | {"exti", SC(ExtiCmd) 0 }, /* CF+ */ |
213 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
202 | {"addme", SC(AddMeCmd) 0 }, |
214 | {"addme", SC(AddMeCmd) 0 }, |
203 | {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
215 | {"askface", SC(AskFaceCmd) 0 }, |
204 | {"requestinfo", SC(RequestInfo) 0 }, |
216 | {"requestinfo", SC(RequestInfo) 0 }, |
205 | {"setfacemode", SC(SetFaceMode) 0 }, |
217 | {"setfacemode", SC(SetFaceMode) 0 }, |
206 | {"setsound", SC(SetSound) 0 }, |
218 | {"setsound", SC(SetSound) 0 }, |
207 | {"setup", SC(SetUp) 0 }, |
219 | {"setup", SC(SetUp) 0 }, |
208 | {"version", SC(VersionCmd) 0 }, |
220 | {"version", SC(VersionCmd) 0 }, |
… | |
… | |
213 | |
225 | |
214 | bool |
226 | bool |
215 | client::may_execute (const packet_type *pkt) const |
227 | client::may_execute (const packet_type *pkt) const |
216 | { |
228 | { |
217 | return (!(pkt->flags & PF_PLAYER) || pl) |
229 | return (!(pkt->flags & PF_PLAYER) || pl) |
218 | && (!(pkt->flags & PF_PLAYING) || (pl && pl->state == ST_PLAYING)); |
230 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
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231 | } |
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232 | |
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233 | // HACK: some commands currently should be executed |
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234 | // even when the player is frozen. this hack detects |
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235 | // those commands. it should be folded into may_execute, |
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236 | // but kept seperate to emphasise the hack aspect, i.e. |
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237 | // do it better, then remove. |
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238 | static bool |
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239 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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240 | { |
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241 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
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242 | return false; |
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243 | |
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244 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
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245 | return false; |
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246 | |
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247 | if (pkt->flags & PF_COMMAND6) |
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248 | { |
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249 | data += 6; |
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250 | len -= 6; |
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251 | } |
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252 | |
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253 | if (len > 4 && !strncmp (data, "say " , 4)) |
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254 | return true; |
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255 | if (len > 5 && !strncmp (data, "chat ", 5)) |
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256 | return true; |
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257 | |
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258 | return false; |
219 | } |
259 | } |
220 | |
260 | |
221 | void |
261 | void |
222 | client::execute (const packet_type *pkt, char *data, int datalen) |
262 | client::execute (const packet_type *pkt, char *data, int datalen) |
223 | { |
263 | { |
224 | if (may_execute (pkt)) |
264 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
225 | { |
265 | { |
226 | //TODO: only one format |
266 | //TODO: only one format |
227 | if (pkt->flags & PF_PLAYER) |
267 | if (pkt->flags & PF_PLAYER) |
228 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
268 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
229 | else |
269 | else |
… | |
… | |
270 | } |
310 | } |
271 | |
311 | |
272 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
312 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
273 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
313 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
274 | { |
314 | { |
275 | if (pkt->flags & PF_PLAYER) |
315 | if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
276 | queue_command (pkt, data, datalen); |
316 | queue_command (pkt, data, datalen); |
277 | else |
317 | else |
278 | execute (pkt, data, datalen); |
318 | execute (pkt, data, datalen); |
279 | |
319 | |
280 | goto next_packet; |
320 | goto next_packet; |
… | |
… | |
294 | // callback called when socket is either readable or writable |
334 | // callback called when socket is either readable or writable |
295 | void |
335 | void |
296 | client::socket_cb (iow &w, int got) |
336 | client::socket_cb (iow &w, int got) |
297 | { |
337 | { |
298 | //TODO remove when we have better socket cleanup logic |
338 | //TODO remove when we have better socket cleanup logic |
299 | if (destroyed) |
339 | if (destroyed ()) |
300 | { |
340 | { |
301 | socket_ev.poll (0); |
341 | socket_ev.poll (0); |
302 | return; |
342 | return; |
303 | } |
343 | } |
304 | |
344 | |
… | |
… | |
343 | } |
383 | } |
344 | else |
384 | else |
345 | { |
385 | { |
346 | inbuf_len += amount; |
386 | inbuf_len += amount; |
347 | |
387 | |
348 | cst_tot.ibytes += amount; |
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349 | cst_lst.ibytes += amount; |
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350 | |
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351 | cmd_ev.start (); |
388 | cmd_ev.start (); |
352 | } |
389 | } |
353 | } |
390 | } |
354 | } |
391 | } |
355 | |
392 | |
… | |
… | |
377 | */ |
414 | */ |
378 | void |
415 | void |
379 | client::send (void *buf_, int len) |
416 | client::send (void *buf_, int len) |
380 | { |
417 | { |
381 | char *buf = (char *)buf_; |
418 | char *buf = (char *)buf_; |
382 | char *pos = buf; |
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383 | int amt = 0; |
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384 | |
419 | |
385 | if (destroyed || !buf) |
420 | if (destroyed () || !buf) |
386 | return; |
421 | return; |
387 | |
422 | |
388 | if ((len + outputbuffer.len) > SOCKETBUFSIZE) |
423 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
389 | { |
424 | { |
390 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
425 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
391 | destroy (); |
426 | // shutdown the socket, this is safer than destroying it immediately |
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427 | // as lots of code in the callchain might still access the map etc. |
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428 | shutdown (fd, SHUT_RDWR); |
392 | return; |
429 | return; |
393 | } |
430 | } |
394 | |
431 | |
395 | int avail, end; |
432 | int avail, end; |
396 | |
433 | |
… | |
… | |
421 | * shortcut function. |
458 | * shortcut function. |
422 | */ |
459 | */ |
423 | void |
460 | void |
424 | client::send_packet (packet &sl) |
461 | client::send_packet (packet &sl) |
425 | { |
462 | { |
426 | if (destroyed) |
463 | if (destroyed ()) |
427 | return; |
464 | return; |
428 | |
465 | |
429 | if (sl.length () >= MAXSOCKBUF) |
466 | if (sl.length () >= MAXSOCKBUF) |
430 | { |
467 | { |
431 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
468 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
… | |
… | |
472 | va_end (ap); |
509 | va_end (ap); |
473 | |
510 | |
474 | send_packet (sl); |
511 | send_packet (sl); |
475 | } |
512 | } |
476 | |
513 | |
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514 | // returns true when the message needs special (read: perl) treatment |
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515 | static bool |
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516 | msg_is_special (const char *msg) |
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517 | { |
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518 | return msg [strcspn (msg, "<[&\n")]; |
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519 | } |
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520 | |
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521 | void |
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522 | client::send_msg (int color, const char *type, const char *msg) |
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523 | { |
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524 | if (msg_is_special (msg)) |
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525 | cfperl_send_msg (this, color, type, msg); |
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526 | else if (can_msg) |
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527 | send_packet_printf ("msg %d %s %s", color, type, msg); |
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528 | else if (color < 0) |
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529 | return; // client cannot handle this |
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530 | else |
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531 | send_packet_printf ("drawinfo %d %s", color, msg); |
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532 | } |
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533 | |
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534 | void |
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535 | client::send_drawinfo (const char *msg, int flags) |
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536 | { |
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537 | send_msg (flags, "log", msg); |
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538 | } |
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539 | |
477 | /*********************************************************************** |
540 | /*********************************************************************** |
478 | * |
541 | * |
479 | * packet functions/utilities |
542 | * packet functions/utilities |
480 | * |
543 | * |
481 | **********************************************************************/ |
544 | **********************************************************************/ |
… | |
… | |
487 | int len = strlen (name); |
550 | int len = strlen (name); |
488 | memcpy (cur, name, len); cur += len; |
551 | memcpy (cur, name, len); cur += len; |
489 | *cur++ = ' '; |
552 | *cur++ = ' '; |
490 | } |
553 | } |
491 | |
554 | |
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555 | packet &packet::operator <<(const ber32 v) |
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556 | { |
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557 | enum { maxlen = 32 / 7 + 1}; |
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558 | uint8 buf[maxlen]; |
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559 | uint8 *p = buf + maxlen; |
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560 | uint32 val = v.val; |
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561 | |
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562 | *--p = val & 0x7F; |
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563 | |
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564 | while (val > 0x7F) |
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565 | { |
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566 | val >>= 7; |
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567 | *--p = (val & 0x7F) | 0x80; |
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568 | } |
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569 | |
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570 | return *this << data (p, buf + maxlen - p); |
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571 | } |
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572 | |
492 | packet &packet::operator <<(const data &v) |
573 | packet &packet::operator <<(const data &v) |
493 | { |
574 | { |
494 | if (room () < v.len) |
575 | if (room () < v.len) |
495 | reset (); |
576 | reset (); |
496 | else |
577 | else |
… | |
… | |
533 | return reset (); |
614 | return reset (); |
534 | |
615 | |
535 | cur += len; |
616 | cur += len; |
536 | } |
617 | } |
537 | |
618 | |
538 | /****************************************************************************** |
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539 | * |
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540 | * statistics logging functions. |
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541 | * |
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542 | ******************************************************************************/ |
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543 | |
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544 | #ifdef CS_LOGSTATS |
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545 | |
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546 | /* cst_tot is for the life of the server, cst_last is for the last series of |
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547 | * stats |
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548 | */ |
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549 | CS_Stats cst_tot, cst_lst; |
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550 | |
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551 | /** |
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552 | * Writes out the gathered stats. We clear cst_lst. |
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553 | */ |
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554 | void |
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555 | write_cs_stats (void) |
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556 | { |
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557 | time_t now = time (NULL); |
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558 | |
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559 | /* If no connections recently, don't both to log anything */ |
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560 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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561 | return; |
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562 | |
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563 | /* CSSTAT is put in so scripts can easily find the line */ |
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564 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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565 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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566 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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567 | cst_lst.ibytes = 0; |
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568 | cst_lst.obytes = 0; |
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569 | cst_lst.time_start = now; |
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570 | } |
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571 | #endif |
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572 | |
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