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 (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team |
4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
5 | Copyright (C) 1992 Frank Tore Johansen |
5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
6 | |
6 | * |
7 | 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 |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | * the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. |
10 | * (at your option) any later version. |
11 | |
11 | * |
12 | 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, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
15 | * GNU General Public License for more details. |
16 | |
16 | * |
17 | 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 |
18 | along with this program; if not, write to the Free Software |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 | |
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21 | The author can be reached via e-mail to mark@pyramid.com |
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22 | */ |
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23 | |
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24 | /** |
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25 | * \file |
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26 | * Low-level socket-related functions. |
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27 | * |
19 | * |
28 | * \date 2003-12-02 |
20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
29 | * |
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30 | * Contains some base functions that both the client and server |
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31 | * can use. As such, depending what we are being compiled for will |
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32 | * determine what we can include. the client is designed have |
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33 | * CFCLIENT defined as part of its compile flags. |
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34 | */ |
21 | */ |
35 | |
22 | |
36 | using namespace std; |
23 | using namespace std; |
37 | |
24 | |
38 | #include <global.h> |
25 | #include <global.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 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
47 | #endif |
34 | #endif |
48 | |
35 | |
49 | // 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 |
50 | // easily die in 20 seconds... |
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51 | #define SOCKET_TIMEOUT1 10 * 1000 |
37 | #define SOCKET_TIMEOUT 8. |
52 | #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. |
53 | |
42 | |
54 | void |
43 | void |
55 | client::flush () |
44 | client::flush () |
56 | { |
45 | { |
57 | if (destroyed ()) |
46 | if (destroyed ()) |
58 | return; |
47 | return; |
59 | |
48 | |
60 | #ifdef __linux__ |
49 | #if HAVE_TCP_INFO |
61 | // check time of last ack, and, if too old, kill connection |
50 | // check time of last ack, and, if too old, kill connection |
62 | struct tcp_info tcpi; |
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63 | socklen_t len = sizeof (tcpi); |
51 | socklen_t len = sizeof (tcpi); |
64 | |
52 | |
65 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
53 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
66 | { |
54 | { |
67 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
55 | if (tcpi.tcpi_snd_mss) |
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56 | mss = tcpi.tcpi_snd_mss; |
68 | |
57 | |
69 | rtt = tcpi.tcpi_rtt; |
58 | #if 0 |
70 | rttvar = tcpi.tcpi_rttvar; |
59 | fprintf (stderr, "uack %d ack %d lost %d ret %d fack %d sst %d cwnd %d mss %d pmtu %d advmss %d EXC %d\n", |
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60 | tcpi.tcpi_unacked, |
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61 | tcpi.tcpi_sacked, |
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62 | tcpi.tcpi_lost, |
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63 | tcpi.tcpi_retrans, |
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64 | tcpi.tcpi_fackets, |
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65 | tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss, |
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66 | |
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67 | tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked)); |
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68 | #endif |
71 | |
69 | |
72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
70 | // do this only when player is active |
73 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
71 | if (pl && pl->active |
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72 | && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
74 | { |
73 | { |
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74 | send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
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75 | write_outputbuffer (); |
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76 | |
75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
77 | 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); |
78 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
77 | destroy (); |
79 | destroy (); |
78 | } |
80 | } |
79 | } |
81 | } |
80 | #endif |
82 | #endif |
81 | |
83 | |
… | |
… | |
84 | * |
86 | * |
85 | * When the socket is clear to write, and we have backlogged data, this |
87 | * When the socket is clear to write, and we have backlogged data, this |
86 | * is called to write it out. |
88 | * is called to write it out. |
87 | */ |
89 | */ |
88 | |
90 | |
89 | if (!outputbuffer.len || socket_ev.poll () & PE_W) |
91 | // write a nop to the socket at least every IDLE_NOP seconds. |
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92 | if (!outputbuffer.len) |
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93 | { |
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94 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
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95 | { |
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96 | // this is a bit ugly, but map1/map1a seem to be the only |
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97 | // nop'able commands and they are quite small. |
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98 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
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99 | send_packet (sl); |
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100 | } |
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101 | else |
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102 | return; |
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103 | } |
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104 | |
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105 | if (socket_ev.poll () & PE_W) |
90 | return; |
106 | return; |
91 | |
107 | |
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108 | last_send = NOW; |
92 | write_outputbuffer (); |
109 | write_outputbuffer (); |
93 | } |
110 | } |
94 | |
111 | |
95 | void |
112 | void |
96 | client::write_outputbuffer () |
113 | client::write_outputbuffer () |
… | |
… | |
106 | /* wrap back to start of buffer */ |
123 | /* wrap back to start of buffer */ |
107 | if (outputbuffer.start == SOCKETBUFSIZE) |
124 | if (outputbuffer.start == SOCKETBUFSIZE) |
108 | outputbuffer.start = 0; |
125 | outputbuffer.start = 0; |
109 | |
126 | |
110 | outputbuffer.len -= res; |
127 | outputbuffer.len -= res; |
111 | #ifdef CS_LOGSTATS |
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112 | cst_tot.obytes += res; |
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113 | cst_lst.obytes += res; |
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114 | #endif |
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115 | } |
128 | } |
116 | else if (res == 0) |
129 | else if (res == 0) |
117 | { |
130 | { |
118 | LOG (llevError, "socket write failed, connection closed.\n"); |
131 | LOG (llevError, "socket write failed, connection closed.\n"); |
119 | destroy (); |
132 | destroy (); |
… | |
… | |
157 | if (inbuf_len >= 2 + pkt_len) |
170 | if (inbuf_len >= 2 + pkt_len) |
158 | return 2 + pkt_len; |
171 | return 2 + pkt_len; |
159 | |
172 | |
160 | if (inbuf_len == sizeof (inbuf)) |
173 | if (inbuf_len == sizeof (inbuf)) |
161 | { |
174 | { |
162 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
175 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY); |
163 | destroy (); |
176 | destroy (); |
164 | return -1; |
177 | return -1; |
165 | } |
178 | } |
166 | } |
179 | } |
167 | |
180 | |
… | |
… | |
186 | |
199 | |
187 | /** |
200 | /** |
188 | * Dispatch table for the server. |
201 | * Dispatch table for the server. |
189 | */ |
202 | */ |
190 | static struct packet_type packets[] = { |
203 | static struct packet_type packets[] = { |
191 | {"ncom", PC(NewPlayerCmd) PF_PLAYING }, |
204 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
192 | {"command", PC(PlayerCmd) PF_PLAYING }, |
205 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
193 | |
206 | |
194 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
207 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
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208 | {"ex", PC(ExCmd) PF_PLAYING }, |
195 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
209 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
196 | {"lookat", PC(LookAt) PF_PLAYING }, |
210 | {"lookat", PC(LookAt) PF_PLAYING }, |
197 | {"lock", PC(LockItem) PF_PLAYING }, |
211 | {"lock", PC(LockItem) PF_PLAYING }, |
198 | {"mark", PC(MarkItem) PF_PLAYING }, |
212 | {"mark", PC(MarkItem) PF_PLAYING }, |
199 | {"move", PC(MoveCmd) PF_PLAYING }, |
213 | {"move", PC(MoveCmd) PF_PLAYING }, |
200 | {"ext", PC(ExtCmd) 0 }, /* CF+ */ |
214 | {"ext", PC(ExtCmd) 0 }, // CF+ |
201 | {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */ |
215 | {"mapredraw", PC(MapRedrawCmd) 0 }, |
202 | {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */ |
216 | {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
203 | |
217 | |
204 | {"reply", SC(ReplyCmd) 0 }, |
218 | {"reply", SC(ReplyCmd) 0 }, |
205 | {"exti", SC(ExtiCmd) 0 }, /* CF+ */ |
219 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
206 | {"addme", SC(AddMeCmd) 0 }, |
220 | {"addme", SC(AddMeCmd) 0 }, |
207 | {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
221 | {"askface", SC(AskFaceCmd) 0 }, |
208 | {"requestinfo", SC(RequestInfo) 0 }, |
222 | {"requestinfo", SC(RequestInfo) 0 }, |
209 | {"setfacemode", SC(SetFaceMode) 0 }, |
223 | {"setfacemode", SC(SetFaceMode) 0 }, |
210 | {"setsound", SC(SetSound) 0 }, |
224 | {"setsound", SC(SetSound) 0 }, |
211 | {"setup", SC(SetUp) 0 }, |
225 | {"setup", SC(SetUp) 0 }, |
212 | {"version", SC(VersionCmd) 0 }, |
226 | {"version", SC(VersionCmd) 0 }, |
… | |
… | |
220 | { |
234 | { |
221 | return (!(pkt->flags & PF_PLAYER) || pl) |
235 | return (!(pkt->flags & PF_PLAYER) || pl) |
222 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
236 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
223 | } |
237 | } |
224 | |
238 | |
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239 | // HACK: some commands currently should be executed |
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240 | // even when the player is frozen. this hack detects |
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241 | // those commands. it should be folded into may_execute, |
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242 | // but kept seperate to emphasise the hack aspect, i.e. |
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243 | // do it better, then remove. |
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244 | static bool |
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245 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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246 | { |
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247 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
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248 | return false; |
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249 | |
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250 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
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251 | return false; |
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252 | |
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253 | if (pkt->flags & PF_COMMAND6) |
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254 | { |
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255 | data += 6; |
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256 | len -= 6; |
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257 | } |
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258 | |
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259 | if (len > 4 && !strncmp (data, "say " , 4)) |
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260 | return true; |
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261 | if (len > 5 && !strncmp (data, "chat ", 5)) |
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262 | return true; |
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263 | |
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264 | return false; |
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265 | } |
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266 | |
225 | void |
267 | void |
226 | client::execute (const packet_type *pkt, char *data, int datalen) |
268 | client::execute (const packet_type *pkt, char *data, int datalen) |
227 | { |
269 | { |
228 | if (may_execute (pkt)) |
270 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
229 | { |
271 | { |
230 | //TODO: only one format |
272 | //TODO: only one format |
231 | if (pkt->flags & PF_PLAYER) |
273 | if (pkt->flags & PF_PLAYER) |
232 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
274 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
233 | else |
275 | else |
234 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
276 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
235 | } |
277 | } |
236 | else |
278 | else |
237 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
279 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
238 | } |
280 | } |
239 | |
281 | |
240 | bool |
282 | bool |
241 | client::handle_packet () |
283 | client::handle_packet () |
242 | { |
284 | { |
… | |
… | |
274 | } |
316 | } |
275 | |
317 | |
276 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
318 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
277 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
319 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
278 | { |
320 | { |
279 | if (pkt->flags & PF_PLAYER) |
321 | if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
280 | queue_command (pkt, data, datalen); |
322 | queue_command (pkt, data, datalen); |
281 | else |
323 | else |
282 | execute (pkt, data, datalen); |
324 | execute (pkt, data, datalen); |
283 | |
325 | |
284 | goto next_packet; |
326 | goto next_packet; |
285 | } |
327 | } |
286 | |
328 | |
287 | // If we get here, we didn't find a valid command. |
329 | // If we get here, we didn't find a valid command. |
288 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
330 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
289 | next_packet: |
331 | next_packet: |
290 | skip_packet (pkt_len); |
332 | skip_packet (pkt_len); |
291 | |
333 | |
292 | // input buffer has space again |
334 | // input buffer has space again |
293 | socket_ev.poll (socket_ev.poll () | PE_R); |
335 | socket_ev.poll (socket_ev.poll () | PE_R); |
… | |
… | |
347 | } |
389 | } |
348 | else |
390 | else |
349 | { |
391 | { |
350 | inbuf_len += amount; |
392 | inbuf_len += amount; |
351 | |
393 | |
352 | cst_tot.ibytes += amount; |
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353 | cst_lst.ibytes += amount; |
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354 | |
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355 | cmd_ev.start (); |
394 | cmd_ev.start (); |
356 | } |
395 | } |
357 | } |
396 | } |
358 | } |
397 | } |
359 | |
398 | |
… | |
… | |
381 | */ |
420 | */ |
382 | void |
421 | void |
383 | client::send (void *buf_, int len) |
422 | client::send (void *buf_, int len) |
384 | { |
423 | { |
385 | char *buf = (char *)buf_; |
424 | char *buf = (char *)buf_; |
386 | char *pos = buf; |
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387 | int amt = 0; |
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388 | |
425 | |
389 | if (destroyed () || !buf) |
426 | if (destroyed () || !buf) |
390 | return; |
427 | return; |
391 | |
428 | |
392 | if ((len + outputbuffer.len) > SOCKETBUFSIZE) |
429 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
393 | { |
430 | { |
394 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
431 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
395 | destroy (); |
432 | // shutdown the socket, this is safer than destroying it immediately |
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433 | // as lots of code in the callchain might still access the map etc. |
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434 | shutdown (fd, SHUT_RDWR); |
396 | return; |
435 | return; |
397 | } |
436 | } |
398 | |
437 | |
399 | int avail, end; |
438 | int avail, end; |
400 | |
439 | |
… | |
… | |
476 | va_end (ap); |
515 | va_end (ap); |
477 | |
516 | |
478 | send_packet (sl); |
517 | send_packet (sl); |
479 | } |
518 | } |
480 | |
519 | |
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520 | // returns true when the message needs special (read: perl) treatment |
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521 | static bool |
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522 | msg_is_special (const char *msg) |
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523 | { |
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524 | return msg [strcspn (msg, "<[&\n")]; |
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525 | } |
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526 | |
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527 | void |
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528 | client::send_msg (int color, const char *type, const char *msg) |
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529 | { |
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530 | if (msg_is_special (msg)) |
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531 | cfperl_send_msg (this, color, type, msg); |
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532 | else if (can_msg) |
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533 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
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534 | else if (color < 0) |
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535 | return; // client cannot handle this |
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536 | else |
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537 | send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg); |
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538 | } |
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539 | |
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540 | void |
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541 | client::send_drawinfo (const char *msg, int flags) |
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542 | { |
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543 | send_msg (flags, "log", msg); |
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544 | } |
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545 | |
481 | /*********************************************************************** |
546 | /*********************************************************************** |
482 | * |
547 | * |
483 | * packet functions/utilities |
548 | * packet functions/utilities |
484 | * |
549 | * |
485 | **********************************************************************/ |
550 | **********************************************************************/ |
… | |
… | |
491 | int len = strlen (name); |
556 | int len = strlen (name); |
492 | memcpy (cur, name, len); cur += len; |
557 | memcpy (cur, name, len); cur += len; |
493 | *cur++ = ' '; |
558 | *cur++ = ' '; |
494 | } |
559 | } |
495 | |
560 | |
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561 | packet &packet::operator <<(const ber32 v) |
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562 | { |
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563 | enum { maxlen = 32 / 7 + 1}; |
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564 | uint8 buf[maxlen]; |
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565 | uint8 *p = buf + maxlen; |
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566 | uint32 val = v.val; |
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567 | |
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568 | *--p = val & 0x7F; |
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569 | |
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570 | while (val > 0x7F) |
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571 | { |
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572 | val >>= 7; |
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573 | *--p = (val & 0x7F) | 0x80; |
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574 | } |
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575 | |
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576 | return *this << data (p, buf + maxlen - p); |
|
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577 | } |
|
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578 | |
496 | packet &packet::operator <<(const data &v) |
579 | packet &packet::operator <<(const data &v) |
497 | { |
580 | { |
498 | if (room () < v.len) |
581 | if (room () < v.len) |
499 | reset (); |
582 | reset (); |
500 | else |
583 | else |
… | |
… | |
537 | return reset (); |
620 | return reset (); |
538 | |
621 | |
539 | cur += len; |
622 | cur += len; |
540 | } |
623 | } |
541 | |
624 | |
542 | /****************************************************************************** |
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543 | * |
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544 | * statistics logging functions. |
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545 | * |
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546 | ******************************************************************************/ |
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547 | |
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548 | #ifdef CS_LOGSTATS |
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549 | |
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550 | /* cst_tot is for the life of the server, cst_last is for the last series of |
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551 | * stats |
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552 | */ |
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553 | CS_Stats cst_tot, cst_lst; |
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554 | |
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555 | /** |
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556 | * Writes out the gathered stats. We clear cst_lst. |
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557 | */ |
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558 | void |
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559 | write_cs_stats (void) |
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560 | { |
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561 | time_t now = time (NULL); |
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562 | |
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563 | /* If no connections recently, don't both to log anything */ |
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564 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
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565 | return; |
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566 | |
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567 | /* CSSTAT is put in so scripts can easily find the line */ |
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568 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
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569 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
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570 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
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571 | cst_lst.ibytes = 0; |
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572 | cst_lst.obytes = 0; |
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573 | cst_lst.time_start = now; |
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574 | } |
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575 | #endif |
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576 | |
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