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) 2002-2003 Mark Wedel & The Crossfire Development Team |
5 | * Copyright (©) 2002-2003,2007 Mark Wedel & The Crossfire Development Team |
5 | Copyright (C) 1992 Frank Tore Johansen |
6 | * Copyright (©) 1992,2007 Frank Tore Johansen |
6 | |
7 | * |
7 | This program is free software; you can redistribute it and/or modify |
8 | * 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 |
9 | * 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 |
10 | * the Free Software Foundation, either version 3 of the License, or |
10 | (at your option) any later version. |
11 | * (at your option) any later version. |
11 | |
12 | * |
12 | This program is distributed in the hope that it will be useful, |
13 | * This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
16 | * GNU General Public License for more details. |
16 | |
17 | * |
17 | You should have received a copy of the GNU General Public License |
18 | * You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software |
19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
20 | * |
20 | |
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21 | The author can be reached via e-mail to <crossfire@schmorp.de> |
21 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
22 | */ |
22 | */ |
23 | |
23 | |
24 | /** |
24 | /** |
25 | * \file |
25 | * \file |
26 | * Main client/server loops. |
26 | * Main client/server loops. |
27 | * |
27 | * |
28 | * \date 2003-12-02 |
28 | * \date 2003-12-02 |
29 | * |
29 | * |
30 | * loop.c mainly deals with initialization and higher level socket |
30 | * loop.c mainly deals with initialization and higher level socket |
31 | * maintenance (checking for lost connections and if data has arrived.) |
31 | * maintanance (checking for lost connections and if data has arrived.) |
32 | * The reading of data is handled in ericserver.c |
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33 | */ |
32 | */ |
34 | |
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35 | |
33 | |
36 | #include <global.h> |
34 | #include <global.h> |
37 | #include <sproto.h> |
35 | #include <sproto.h> |
38 | #include <sockproto.h> |
36 | #include <sockproto.h> |
39 | |
37 | |
… | |
… | |
45 | |
43 | |
46 | #include <unistd.h> |
44 | #include <unistd.h> |
47 | #include <arpa/inet.h> |
45 | #include <arpa/inet.h> |
48 | |
46 | |
49 | #include <loader.h> |
47 | #include <loader.h> |
50 | #include <newserver.h> |
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51 | |
48 | |
52 | /***************************************************************************** |
49 | #define BG_SCRUB_RATE 4 // how often to send a face in the background |
53 | * Start of command dispatch area. |
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54 | * The commands here are protocol commands. |
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55 | ****************************************************************************/ |
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56 | |
50 | |
57 | /* Either keep this near the start or end of the file so it is |
51 | #define MAX_QUEUE_DEPTH 50 |
58 | * at least reasonablye easy to find. |
52 | #define MAX_QUEUE_BACKLOG 3. |
59 | * There are really 2 commands - those which are sent/received |
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60 | * before player joins, and those happen after the player has joined. |
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61 | * As such, we have function types that might be called, so |
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62 | * we end up having 2 tables. |
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63 | */ |
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64 | |
53 | |
65 | enum { |
54 | // disconnect a socket after this many seconds without an ack |
66 | PF_PLAYER = 0x01, // must have valid player |
55 | #define SOCKET_TIMEOUT 8. |
67 | PF_IMMEDIATE = 0x02, // TODO: hack, can be executed immediately |
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68 | PF_PLAYING = 0x04, // must be in playing state |
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69 | }; |
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70 | |
56 | |
71 | struct pkt_type |
57 | void |
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58 | client::reset_state () |
72 | { |
59 | { |
73 | const char *name; |
60 | if (!pl) |
74 | void *cb; |
61 | return; |
75 | int flags; |
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76 | |
62 | |
77 | bool may_execute (client_socket *ns) |
63 | pl->run_on = 0; |
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64 | pl->fire_on = 0; |
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65 | } |
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66 | |
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67 | void |
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68 | client::queue_command (packet_type *handler, char *data, int datalen) |
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69 | { |
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70 | tstamp stamp = NOW; |
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71 | |
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72 | if (cmd_queue.size () >= MAX_QUEUE_DEPTH) |
78 | { |
73 | { |
79 | return (!(flags & PF_PLAYER) || ns->pl) |
74 | //TODO: just disconnect here? |
80 | && (!(flags & PF_PLAYING) || (ns->pl && ns->pl->state == ST_PLAYING)); |
75 | reset_state (); |
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76 | send_packet_printf ("drawinfo %d command queue overflow, ignoring.", NDI_RED); |
81 | } |
77 | } |
82 | |
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83 | void execute (client_socket *ns, char *data, int datalen) |
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84 | { |
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85 | //TODO: only one format |
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86 | if (flags & PF_PLAYER) |
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87 | ((void (*)(char *, int, player * ))cb)((char *)data, datalen, ns->pl); |
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88 | else |
78 | else |
89 | ((void (*)(char *, int, client_socket *))cb)((char *)data, datalen, ns); |
79 | { |
90 | } |
80 | cmd_queue.push_back (command ()); |
91 | }; |
81 | command &cmd = cmd_queue.back (); |
92 | |
82 | cmd.stamp = stamp; |
93 | // SocketCommand, PlayingCommand, should not exist with those ugly casts |
83 | cmd.handler = handler; |
94 | #define SC(cb) (void *)static_cast<void (*)(char *, int, client_socket *)>(cb), |
84 | cmd.data = salloc<char> (datalen + 1, data); |
95 | #define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | |
85 | cmd.datalen = datalen; |
96 | |
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97 | /** |
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98 | * Dispatch table for the server. |
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99 | */ |
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100 | static struct pkt_type packets[] = { |
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101 | {"ncom", PC(NewPlayerCmd) PF_PLAYING }, |
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102 | {"command", PC(PlayerCmd) PF_PLAYING }, |
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103 | |
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104 | {"examine", PC(ExamineCmd) PF_PLAYING | PF_IMMEDIATE }, |
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105 | {"apply", PC(ApplyCmd) PF_PLAYING | PF_IMMEDIATE }, |
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106 | {"reply", PC(ReplyCmd) PF_IMMEDIATE }, |
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107 | {"lookat", PC(LookAt) PF_PLAYING | PF_IMMEDIATE }, |
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108 | {"lock", PC(LockItem) PF_PLAYING | PF_IMMEDIATE }, |
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109 | {"mark", PC(MarkItem) PF_PLAYING | PF_IMMEDIATE }, |
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110 | {"move", PC(MoveCmd) PF_PLAYING | PF_IMMEDIATE }, |
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111 | {"ext", PC(ExtCmd) PF_IMMEDIATE }, /* CF+ */ |
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112 | {"mapredraw", PC(MapRedrawCmd) PF_IMMEDIATE }, /* Added: phil */ |
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113 | {"mapinfo", PC(MapInfoCmd) PF_IMMEDIATE }, /* CF+ */ |
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114 | |
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115 | {"addme", SC(AddMeCmd) PF_IMMEDIATE }, |
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116 | {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */ |
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117 | {"requestinfo", SC(RequestInfo) 0 }, |
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118 | {"setfacemode", SC(SetFaceMode) PF_IMMEDIATE }, |
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119 | {"setsound", SC(SetSound) PF_IMMEDIATE }, |
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120 | {"setup", SC(SetUp) PF_IMMEDIATE }, |
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121 | {"version", SC(VersionCmd) PF_IMMEDIATE }, |
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122 | {"toggleextendedinfos", SC(ToggleExtendedInfos) PF_IMMEDIATE }, /*Added: tchize */ |
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123 | {"toggleextendedtext", SC(ToggleExtendedText) PF_IMMEDIATE }, /*Added: tchize */ |
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124 | {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
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125 | }; |
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126 | |
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127 | /** |
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128 | * Handle client input. |
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129 | * |
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130 | * HandleClient is actually not named really well - we only get here once |
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131 | * there is input, so we don't do exception or other stuff here. |
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132 | * sock is the output socket information. pl is the player associated |
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133 | * with this socket, null if no player (one of the init_sockets for just |
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134 | * starting a connection) |
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135 | */ |
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136 | |
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137 | void |
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138 | HandleClient (client_socket *ns, player *pl) |
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139 | { |
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140 | /* Loop through this - maybe we have several complete packets here. */ |
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141 | // limit to a few commands only, though, as to not monopolise the server |
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142 | for (int repeat = 16; repeat--;) |
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143 | { |
86 | } |
144 | /* If it is a player, and they don't have any speed left, we |
87 | } |
145 | * return, and will read in the data when they do have time. |
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146 | */ |
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147 | if (pl && pl->state == ST_PLAYING && pl->ob && pl->ob->speed_left < 0) |
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148 | return; |
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149 | |
88 | |
150 | int pkt_len = ns->read_packet (); |
89 | bool |
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90 | client::handle_command () |
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91 | { |
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92 | if (!cmd_queue.empty () |
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93 | && state == ST_PLAYING |
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94 | && pl->ob->speed_left > 0.f) |
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95 | { |
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96 | command &cmd = cmd_queue.front (); |
151 | |
97 | |
152 | if (pkt_len < 0) |
98 | if (cmd.stamp + MAX_QUEUE_BACKLOG < NOW) |
153 | { |
99 | { |
154 | LOG (llevError, "read error on player %s\n", &pl->ob->name); |
100 | reset_state (); |
155 | /* Caller will take care of cleaning this up */ |
101 | send_packet_printf ("drawinfo %d ignoring delayed commands.", NDI_RED); |
156 | ns->status = Ns_Dead; |
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157 | return; |
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158 | } |
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159 | else if (pkt_len == 0) |
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160 | /* Still dont have a full packet */ |
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161 | return; |
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162 | |
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163 | /* First, break out beginning word. There are at least |
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164 | * a few commands that do not have any paremeters. If |
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165 | * we get such a command, don't worry about trying |
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166 | * to break it up. |
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167 | */ |
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168 | int datalen; |
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169 | char *data = strchr ((char *)ns->inbuf + 2, ' '); |
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170 | |
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171 | if (data) |
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172 | { |
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173 | *data++ = 0; |
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174 | datalen = pkt_len - (data - (char *)ns->inbuf); |
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175 | } |
102 | } |
176 | else |
103 | else |
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104 | execute (cmd.handler, cmd.data, cmd.datalen); |
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105 | |
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106 | cmd_queue.pop_front (); |
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107 | return true; |
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108 | } |
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109 | else |
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110 | return false; |
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111 | } |
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112 | |
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113 | void |
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114 | client::tick () |
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115 | { |
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116 | if (!pl || destroyed ()) |
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117 | return; |
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118 | |
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119 | /* Update the players stats once per tick. More efficient than |
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120 | * sending them whenever they change, and probably just as useful |
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121 | */ |
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122 | esrv_update_stats (pl); |
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123 | |
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124 | if (last_weight != -1 && last_weight != WEIGHT (pl->ob)) |
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125 | { |
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126 | esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob); |
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127 | if (last_weight != WEIGHT (pl->ob)) |
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128 | LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n", |
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129 | (unsigned long) last_weight, WEIGHT (pl->ob)); |
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130 | } |
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131 | |
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132 | draw_client_map (pl); |
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133 | |
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134 | if (update_look) |
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135 | esrv_draw_look (pl); |
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136 | |
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137 | #if HAVE_TCP_INFO |
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138 | // check time of last ack, and, if too old, kill connection |
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139 | socklen_t len = sizeof (tcpi); |
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140 | |
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141 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
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142 | { |
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143 | if (tcpi.tcpi_snd_mss) |
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144 | mss = tcpi.tcpi_snd_mss; |
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145 | |
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146 | #if 0 |
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147 | 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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148 | tcpi.tcpi_unacked, |
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149 | tcpi.tcpi_sacked, |
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150 | tcpi.tcpi_lost, |
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151 | tcpi.tcpi_retrans, |
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152 | tcpi.tcpi_fackets, |
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153 | tcpi.tcpi_snd_ssthresh, tcpi.tcpi_snd_cwnd, tcpi.tcpi_advmss, tcpi.tcpi_pmtu, tcpi.tcpi_advmss, |
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154 | |
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155 | tcpi.tcpi_snd_cwnd - (tcpi.tcpi_unacked - tcpi.tcpi_sacked)); |
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156 | #endif |
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157 | |
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158 | // do this only when player is active |
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159 | if (pl && pl->active |
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160 | && tcpi.tcpi_last_ack_recv > int (SOCKET_TIMEOUT * 1000)) |
177 | { |
161 | { |
178 | data = (char *)ns->inbuf + 2; // better read garbage than segfault |
162 | send_msg (NDI_RED | NDI_REPLY, "connection-timeout", "safety disconnect due to tcp/ip timeout (no packets received)"); |
179 | datalen = 0; |
163 | write_outputbuffer (); |
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164 | |
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165 | LOG (llevDebug, "connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
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166 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
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167 | destroy (); |
180 | } |
168 | } |
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169 | } |
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170 | #endif |
181 | |
171 | |
182 | ns->inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
172 | rate_avail = min (max_rate + mss, rate_avail + max_rate); |
183 | |
173 | |
184 | for (pkt_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
174 | int max_send = rate_avail; |
185 | if (!strcmp ((char *)ns->inbuf + 2, pkt->name)) |
175 | |
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176 | #if HAVE_TCP_INFO |
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177 | // further restrict the available bandwidth by the excess bandwidth available |
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178 | max_send = min (max_send, (tcpi.tcpi_snd_cwnd - tcpi.tcpi_unacked + tcpi.tcpi_sacked) * mss); |
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179 | #endif |
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180 | |
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181 | // if we can split images, round to next-lowest mss |
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182 | if (fxix) max_send -= max_send % mss; |
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183 | |
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184 | if (ixface.empty ()) |
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185 | { |
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186 | // regularly send a new face when queue is empty |
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187 | if (bg_scrub && !--bg_scrub && enable_bg_scrub) |
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188 | while (scrub_idx < faces.size () - 1) |
186 | { |
189 | { |
187 | if (pkt->may_execute (ns)) |
190 | ++scrub_idx; |
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191 | |
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192 | if (!faces_sent [scrub_idx]) |
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193 | if (faceinfo *f = face_info (scrub_idx)) |
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194 | if (f->type == FT_FACE) // only scrub faces for now |
188 | { |
195 | { |
189 | pkt->execute (ns, data, datalen); |
196 | send_face (scrub_idx, -120); |
190 | ns->skip_packet (pkt_len); |
197 | flush_fx (); |
191 | //D//TODO not doing this causes random memory corruption |
198 | |
192 | if (pkt->flags & PF_IMMEDIATE) |
199 | bg_scrub = 1; // send up to one fx per tick, unless an image was requested |
193 | goto next_packet; |
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194 | return; |
200 | break; |
195 | } |
201 | } |
196 | } |
202 | } |
197 | |
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198 | /* If we get here, we didn't find a valid command. Logging |
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199 | * this might be questionable, because a broken client/malicious |
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200 | * user could certainly send a whole bunch of invalid commands. |
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201 | */ |
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202 | LOG (llevDebug, "Bad command from client (%s)\n", ns->inbuf + 2); |
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203 | ns->skip_packet (pkt_len); |
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204 | next_packet: |
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205 | ; |
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206 | } |
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207 | } |
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208 | |
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209 | void |
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210 | flush_sockets (void) |
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211 | { |
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212 | for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ++i) |
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213 | if ((*i)->status != Ns_Dead) |
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214 | (*i)->flush (); |
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215 | } |
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216 | |
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217 | /** |
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218 | * This checks the sockets for input, does the right thing. |
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219 | * |
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220 | * A bit of this code is grabbed out of socket.c |
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221 | * There are 2 lists we need to look through - init_sockets is a list |
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222 | * |
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223 | */ |
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224 | void |
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225 | doeric_server (void) |
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226 | { |
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227 | int i, pollret; |
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228 | fd_set tmp_read; |
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229 | struct sockaddr_in addr; |
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230 | socklen_t addrlen = sizeof (struct sockaddr); |
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231 | player *pl, *next; |
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232 | int maxfd = 0; |
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233 | |
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234 | #ifdef CS_LOGSTATS |
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235 | if ((time (NULL) - cst_lst.time_start) >= CS_LOGTIME) |
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236 | write_cs_stats (); |
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237 | #endif |
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238 | |
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239 | /* Go through the players. Let the loop set the next pl value, |
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240 | * since we may remove some |
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241 | */ |
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242 | //TODO: must be handled cleanly elsewhere |
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243 | for (pl = first_player; pl; ) |
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244 | { |
203 | } |
245 | player *npl = pl->next; |
204 | else |
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205 | { |
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206 | bg_scrub = BG_SCRUB_RATE; |
246 | |
207 | |
247 | //TODO: must be handled cleanly elsewhere |
208 | for (;;) |
248 | if (pl->socket->status == Ns_Dead) |
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249 | { |
209 | { |
250 | save_player (pl->ob, 0); |
210 | int avail = max_send - outputbuffer_len (); |
251 | |
211 | |
252 | if (!QUERY_FLAG (pl->ob, FLAG_REMOVED)) |
212 | if (avail <= 0) |
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213 | break; |
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214 | |
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215 | ixsend &ix = ixface.back (); |
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216 | |
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217 | if (facedata *d = face_data (ix.idx, faceset)) |
253 | { |
218 | { |
254 | terminate_all_pets (pl->ob); |
219 | if (fxix) |
255 | pl->ob->remove (); |
220 | { |
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221 | // estimate the packet header overhead "ix " + idx + (new)ofs |
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222 | int pktlen = 3 + ber32::encoded_size (ix.idx) + ber32::encoded_size (ix.ofs); |
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223 | int chunk = min (avail - packet::hdrlen, MAXSOCKBUF) - pktlen; |
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224 | |
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225 | // only transfer something if the amount of data transferred |
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226 | // has a healthy relation to the header overhead |
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227 | if (chunk < 64) |
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228 | break; |
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229 | |
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230 | chunk = min (chunk, (int)ix.ofs); |
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231 | |
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232 | ix.ofs -= chunk; |
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233 | |
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234 | //fprintf (stderr, "i%dx %6d: %5d+%4d (%4d)\n", fxix, ix.idx,ix.ofs,chunk, ixface.size());//D |
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235 | |
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236 | packet sl ("ix"); |
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237 | |
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238 | sl << ber32 (ix.idx) |
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239 | << ber32 (ix.ofs) |
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240 | << data (d->data.data () + ix.ofs, chunk); |
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241 | |
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242 | send_packet (sl); |
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243 | } |
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244 | else |
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245 | { |
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246 | send_image (ix.idx); |
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247 | ix.ofs = 0; |
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248 | } |
256 | } |
249 | } |
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250 | else |
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251 | ix.ofs = 0; |
257 | |
252 | |
258 | leave (pl, 1); |
253 | if (!ix.ofs) |
259 | final_free_player (pl); |
254 | { |
|
|
255 | ixface.pop_back (); |
|
|
256 | |
|
|
257 | if (ixface.empty ()) |
|
|
258 | break; |
|
|
259 | } |
260 | } |
260 | } |
261 | |
|
|
262 | pl = npl; |
|
|
263 | } |
|
|
264 | |
|
|
265 | FD_ZERO (&tmp_read); |
|
|
266 | |
|
|
267 | for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ) |
|
|
268 | { |
261 | } |
269 | client_socket *s = *i; |
|
|
270 | |
262 | |
271 | if (s->status == Ns_Dead) |
263 | rate_avail -= outputbuffer_len (); |
272 | { |
264 | } |
273 | client_sockets.erase (i); |
|
|
274 | delete s; |
|
|
275 | } |
|
|
276 | else |
|
|
277 | { |
|
|
278 | if (s->fd > maxfd) maxfd = s->fd; |
|
|
279 | |
265 | |
280 | FD_SET (s->fd, &tmp_read); |
266 | void |
281 | |
267 | client::flush_sockets (void) |
282 | ++i; |
268 | { |
283 | } |
|
|
284 | } |
|
|
285 | |
|
|
286 | struct timeval timeout; |
|
|
287 | |
|
|
288 | timeout.tv_sec = 0; |
|
|
289 | timeout.tv_usec = 0; |
|
|
290 | |
|
|
291 | pollret = select (maxfd + 1, |
|
|
292 | &tmp_read, 0, 0, |
|
|
293 | &timeout); |
|
|
294 | |
|
|
295 | if (pollret == -1) |
|
|
296 | { |
|
|
297 | LOG (llevError, "select failed: %s\n", strerror (errno)); |
|
|
298 | return; |
|
|
299 | } |
|
|
300 | |
|
|
301 | /* We need to do some of the processing below regardless */ |
|
|
302 | |
|
|
303 | /* Check for any input on the sockets */ |
|
|
304 | for (sockvec::iterator i = client_sockets.begin (); i != client_sockets.end (); ++i) |
269 | for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i) |
305 | { |
270 | (*i)->flush (); |
306 | client_socket *s = *i; |
271 | } |
307 | player *pl = s->pl; |
|
|
308 | |
272 | |
309 | //TODO: disassociate handleclient from socket readin |
273 | void |
310 | if (s->inbuf_len || FD_ISSET (s->fd, &tmp_read)) |
274 | client::clock (void) |
311 | HandleClient (s, pl); |
275 | { |
|
|
276 | for (sockvec::iterator i = clients.begin (); i != clients.end (); ++i) |
|
|
277 | (*i)->tick (); |
312 | |
278 | |
|
|
279 | // give them all the same chances |
|
|
280 | flush_sockets (); |
|
|
281 | |
313 | //TODO: should not be done here, either |
282 | //TODO: should not be done here, either |
314 | if (s->status != Ns_Dead && pl) |
283 | for (unsigned i = 0; i < clients.size (); ++i) |
315 | { |
284 | clients[i]->refcnt_chk (); |
316 | /* Update the players stats once per tick. More efficient than |
|
|
317 | * sending them whenever they change, and probably just as useful |
|
|
318 | */ |
|
|
319 | esrv_update_stats (pl); |
|
|
320 | if (pl->last_weight != -1 && pl->last_weight != WEIGHT (pl->ob)) |
|
|
321 | { |
|
|
322 | esrv_update_item (UPD_WEIGHT, pl->ob, pl->ob); |
|
|
323 | if (pl->last_weight != WEIGHT (pl->ob)) |
|
|
324 | LOG (llevError, "esrv_update_item(UPD_WEIGHT) did not set player weight: is %lu, should be %lu\n", |
|
|
325 | (unsigned long) pl->last_weight, WEIGHT (pl->ob)); |
|
|
326 | } |
|
|
327 | |
|
|
328 | /* draw_client_map does sanity checking that map is |
|
|
329 | * valid, so don't do it here. |
|
|
330 | */ |
|
|
331 | draw_client_map (pl->ob); |
|
|
332 | if (s->update_look) |
|
|
333 | esrv_draw_look (pl->ob); |
|
|
334 | } |
|
|
335 | } |
|
|
336 | } |
285 | } |
337 | |
286 | |