1 | /* |
1 | /* |
2 | CrossFire, A Multiplayer game for X-windows |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
3 | |
3 | * |
4 | Copyright (C) 2001 Mark Wedel |
4 | * Copyright (©) 2005,2006,2007,2008,2009,2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | Copyright (C) 1992 Frank Tore Johansen |
5 | * |
6 | |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | This program is free software; you can redistribute it and/or modify |
|
|
8 | it under the terms of the GNU General Public License as published by |
7 | * the terms of the Affero GNU General Public License as published by the |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
10 | (at your option) any later version. |
9 | * option) any later version. |
11 | |
10 | * |
12 | This program is distributed in the hope that it will be useful, |
11 | * This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
14 | * GNU General Public License for more details. |
16 | |
15 | * |
17 | You should have received a copy of the GNU General Public License |
16 | * You should have received a copy of the Affero GNU General Public License |
18 | along with this program; if not, write to the Free Software |
17 | * and the GNU General Public License along with this program. If not, see |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
18 | * <http://www.gnu.org/licenses/>. |
20 | |
19 | * |
21 | The author can be reached via e-mail to <crossfire@schmorp.de> |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
22 | */ |
21 | */ |
23 | |
22 | |
24 | /** |
23 | /* |
25 | * \file |
|
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26 | * Socket general functions |
24 | * Socket general functions |
27 | * |
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28 | * \date 2003-12-02 |
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29 | * |
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30 | * Mainly deals with initialization and higher level socket |
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31 | * maintenance (checking for lost connections and if data has arrived.) |
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32 | * The reading of data is handled in ericserver.c |
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33 | */ |
25 | */ |
34 | |
26 | |
35 | |
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36 | #include <global.h> |
27 | #include <global.h> |
37 | #ifndef __CEXTRACT__ |
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38 | # include <sproto.h> |
28 | #include <sproto.h> |
39 | #endif |
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40 | #include <sys/types.h> |
29 | #include <sys/types.h> |
41 | #include <sys/time.h> |
30 | #include <sys/time.h> |
42 | #include <sys/socket.h> |
31 | #include <sys/socket.h> |
43 | #include <netinet/in.h> |
32 | #include <netinet/in.h> |
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33 | #include <netinet/tcp.h> |
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34 | #include <netinet/ip.h> |
44 | #include <netdb.h> |
35 | #include <netdb.h> |
45 | |
36 | |
46 | #ifdef HAVE_UNISTD_H |
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47 | # include <unistd.h> |
37 | #include <unistd.h> |
48 | #endif |
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49 | |
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50 | #ifdef HAVE_ARPA_INET_H |
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51 | # include <arpa/inet.h> |
38 | #include <arpa/inet.h> |
52 | #endif |
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53 | #include <newserver.h> |
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54 | |
39 | |
55 | Socket_Info socket_info; |
40 | #include <algorithm> |
56 | NewSocket *init_sockets; |
41 | |
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42 | // use relatively small values, as we do not expect to receive much, |
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43 | // and we do userspace write buffering |
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44 | // 8kb limits throughput to roughly 66kb/s |
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45 | #define SOCKET_RCVBUF 8192 |
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46 | #define SOCKET_SNDBUF 16384 |
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47 | |
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48 | sockvec clients; |
57 | |
49 | |
58 | /** |
50 | /** |
59 | * Initializes a connection. Really, it just sets up the data structure, |
51 | * Initializes a connection. Really, it just sets up the data structure, |
60 | * socket setup is handled elsewhere. We do send a version to the |
52 | * socket setup is handled elsewhere. We do send a version to the |
61 | * client. |
53 | * client. |
62 | */ |
54 | */ |
63 | void |
55 | client::client (int fd, const char *peername) |
64 | InitConnection (NewSocket * ns, const char *from_ip) |
56 | : fd (fd), host (strdup (peername)), |
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57 | socket_ev (this, &client::socket_cb) |
65 | { |
58 | { |
66 | SockList sl; |
59 | refcnt_inc (); // the socket is an external reference |
67 | char buf[256]; |
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68 | int bufsize = 65535; /*Supposed absolute upper limit */ |
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69 | int oldbufsize; |
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70 | int buflen = sizeof (int); |
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71 | |
60 | |
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61 | mss = 1500 - 52; // 1500 typical ethernet frame, 66 typical tcp header overhead |
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62 | |
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63 | socket_timeout = 16.; |
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64 | |
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65 | { |
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66 | struct linger linger_opt; |
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67 | |
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68 | linger_opt.l_onoff = 0; |
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69 | linger_opt.l_linger = 0; |
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70 | |
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71 | if (setsockopt (fd, SOL_SOCKET, SO_LINGER, &linger_opt, sizeof (struct linger))) |
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72 | LOG (llevError, "SO_LINGER: %s\n", strerror (errno)); |
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73 | } |
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74 | |
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75 | { |
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76 | int val; |
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77 | |
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78 | #ifdef SO_RCVBUF |
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79 | val = SOCKET_RCVBUF; |
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80 | if (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof (val))) |
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81 | LOG (llevError, "SO_RCVBUF: %s\n", strerror (errno)); |
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82 | #endif |
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83 | |
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84 | #ifdef SO_SNDBUF |
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85 | val = SOCKET_SNDBUF; |
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86 | if (setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof (val))) |
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87 | LOG (llevError, "SO_SNDBUF: %s\n", strerror (errno)); |
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88 | #endif |
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89 | |
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90 | #ifdef IP_TOS |
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91 | val = IPTOS_LOWDELAY; |
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92 | if (setsockopt (fd, IPPROTO_IP, IP_TOS, &val, sizeof (val))) |
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93 | LOG (llevError, "IP_TOS: %s\n", strerror (errno)); |
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94 | #endif |
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95 | |
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96 | #ifdef TCP_NODELAY |
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97 | val = 1; |
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98 | if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof (val))) |
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99 | LOG (llevError, "TCP_NODELAY: %s\n", strerror (errno)); |
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100 | #endif |
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101 | |
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102 | // set some very aggressive keepalive parameters |
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103 | #ifdef TCP_KEEPIDLE |
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104 | val = 1; |
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105 | if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof (val))) |
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106 | LOG (llevError, "TCP_KEEPIDLE: %s\n", strerror (errno)); |
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107 | #endif |
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108 | |
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109 | #ifdef TCP_KEEPCNT |
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110 | val = 3; |
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111 | if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof (val))) |
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112 | LOG (llevError, "TCP_KEEPCNT: %s\n", strerror (errno)); |
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113 | #endif |
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114 | |
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115 | #ifdef TCP_KEEPINTVL |
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116 | val = 1; |
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117 | if (setsockopt (fd, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof (val))) |
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118 | LOG (llevError, "TCP_KEEPINTVL: %s\n", strerror (errno)); |
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119 | #endif |
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120 | |
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121 | // try to find the mss value in use |
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122 | #ifdef TCP_MAXSEG |
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123 | socklen_t sl = sizeof (val); |
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124 | if (!getsockopt (fd, IPPROTO_TCP, TCP_MAXSEG, &val, &sl) && sl == sizeof (val)) |
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125 | mss = val; |
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126 | #endif |
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127 | } |
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128 | |
72 | if (fcntl (ns->fd, F_SETFL, O_NONBLOCK) == -1) |
129 | if (fcntl (fd, F_SETFL, O_NONBLOCK) == -1) |
73 | { |
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74 | LOG (llevError, "InitConnection: Error on fcntl.\n"); |
130 | LOG (llevError, "InitConnection: Error on fcntl.\n"); |
75 | } |
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76 | |
131 | |
77 | if (getsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char *) &oldbufsize, (socklen_t *) & buflen) == -1) |
132 | state = ST_SETUP; |
78 | oldbufsize = 0; |
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79 | if (oldbufsize < bufsize) |
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80 | { |
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81 | #ifdef ESRV_DEBUG |
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82 | LOG (llevDebug, "Default buffer size was %d bytes, will reset it to %d\n", oldbufsize, bufsize); |
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83 | #endif |
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84 | if (setsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char *) &bufsize, sizeof (&bufsize))) |
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85 | { |
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86 | LOG (llevError, "InitConnection: setsockopt unable to set output buf size to %d\n", bufsize); |
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87 | } |
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88 | } |
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89 | buflen = sizeof (oldbufsize); |
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90 | getsockopt (ns->fd, SOL_SOCKET, SO_SNDBUF, (char *) &oldbufsize, (socklen_t *) & buflen); |
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91 | #ifdef ESRV_DEBUG |
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92 | LOG (llevDebug, "Socket buffer size now %d bytes\n", oldbufsize); |
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93 | #endif |
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94 | |
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95 | ns->faceset = 0; |
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96 | ns->facecache = 0; |
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97 | ns->image2 = 0; |
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98 | ns->sound = 0; |
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99 | ns->exp64 = 0; |
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100 | ns->monitor_spells = 0; |
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101 | ns->mapmode = Map0Cmd; |
133 | mapmode = Map1aCmd; |
102 | ns->darkness = 1; |
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103 | ns->status = Ns_Add; |
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104 | ns->mapx = 11; |
134 | mapx = 11; |
105 | ns->mapy = 11; |
135 | mapy = 11; |
106 | ns->newmapcmd = 0; |
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107 | ns->itemcmd = 1; /* Default is version item1 command */ |
136 | itemcmd = 1; /* Default is version item1 command */ |
108 | ns->ext_mapinfos = 0; /*extendedmapinfo datas */ |
137 | max_rate = 100000 / (1000000 / MAX_TIME); // ~1mbit is assumed per default |
109 | ns->EMI_smooth = 0; |
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110 | ns->look_position = 0; |
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111 | ns->update_look = 0; |
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112 | ns->has_readable_type = 0; |
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113 | ns->supported_readables = 0; |
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114 | ns->monitor_spells = 0; |
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115 | ns->mapinfocmd = 0; |
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116 | ns->extcmd = 0; |
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117 | ns->extmap = 0; |
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118 | |
138 | |
119 | /* we should really do some checking here - if total clients overflows |
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120 | * we need to do something more intelligent, because client id's will start |
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121 | * duplicating (not likely in normal cases, but malicous attacks that |
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122 | * just open and close connections could get this total up. |
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123 | */ |
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124 | ns->inbuf.len = 0; |
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125 | ns->inbuf.buf = (unsigned char *) malloc (sizeof (unsigned char) * MAXSOCKBUF); |
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126 | /* Basic initialization. Needed because we do a check in |
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127 | * HandleClient for oldsocketmode without checking the |
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128 | * length of data. |
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129 | */ |
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130 | memset (ns->inbuf.buf, 0, sizeof (unsigned char) * MAXSOCKBUF); |
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131 | memset (&ns->lastmap, 0, sizeof (struct Map)); |
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132 | memset (ns->faces_sent, 0, ns->faces_sent_len * sizeof (*ns->faces_sent)); |
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133 | memset (&ns->anims_sent, 0, sizeof (ns->anims_sent)); |
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134 | memset (&ns->stats, 0, sizeof (struct statsinfo)); |
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135 | /* Do this so we don't send a face command for the client for |
139 | /* Do this so we don't send a face command for the client for |
136 | * this face. Face 0 is sent to the client to say clear |
140 | * this face. Face 0 is sent to the client to say clear |
137 | * face information. |
141 | * face information. |
138 | */ |
142 | */ |
139 | ns->faces_sent[0] = NS_FACESENT_FACE; |
143 | faces_sent[0] = true; |
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144 | fx_want [FT_FACE] = true; // all clients must support image faces |
140 | |
145 | |
141 | ns->outputbuffer.start = 0; |
146 | socket_ev.set (fd, EV_READ); |
142 | ns->outputbuffer.len = 0; |
147 | socket_ev.prio (2); // one higher than the ticker priority |
143 | ns->can_write = 1; |
148 | socket_ev.start (); |
144 | ns->password_fails = 0; |
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145 | |
149 | |
146 | ns->current_map = 0; |
150 | // initialisation done, kick it! |
147 | ns->current_x = 0; |
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148 | ns->current_y = 0; |
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149 | ns->client[0] = 0; |
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150 | ns->buggy_mapscroll = 0; |
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151 | |
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152 | ns->sent_scroll = 0; |
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153 | ns->host = strdup_local (from_ip); |
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154 | sprintf ((char *) buf, "version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO); |
151 | send_packet_printf ("version %d %d %s\n", VERSION_CS, VERSION_SC, VERSION_INFO); |
155 | sl.buf = (unsigned char *) buf; |
152 | flush (); |
156 | sl.len = strlen ((char *) buf); |
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157 | Send_With_Handling (ns, &sl); |
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158 | #ifdef CS_LOGSTATS |
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159 | if (socket_info.nconns > cst_tot.max_conn) |
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160 | cst_tot.max_conn = socket_info.nconns; |
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161 | if (socket_info.nconns > cst_lst.max_conn) |
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162 | cst_lst.max_conn = socket_info.nconns; |
|
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163 | #endif |
|
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164 | } |
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165 | |
153 | |
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154 | reset_stats (); |
166 | |
155 | |
167 | /** This sets up the socket and reads all the image information into memory. */ |
156 | clients.insert (this); |
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157 | } |
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158 | |
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159 | client::~client () |
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160 | { |
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161 | clients.erase (this); |
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162 | |
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163 | mapinfo_queue_clear (); |
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164 | free (stats.range); |
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165 | free (stats.title); |
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166 | free (host); |
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167 | } |
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168 | |
168 | void |
169 | void |
169 | init_ericserver (void) |
170 | client::do_destroy () |
170 | { |
171 | { |
171 | struct sockaddr_in insock; |
172 | INVOKE_CLIENT (CLIENT_DESTROY, this); |
172 | struct protoent *protox; |
173 | attachable::do_destroy (); |
173 | struct linger linger_opt; |
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174 | |
174 | |
175 | #ifdef HAVE_SYSCONF |
175 | if (pl) |
176 | socket_info.max_filedescriptor = sysconf (_SC_OPEN_MAX); |
176 | pl->disconnect (); |
177 | #else |
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178 | # ifdef HAVE_GETDTABLESIZE |
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179 | socket_info.max_filedescriptor = getdtablesize (); |
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180 | # else |
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181 | "Unable to find usable function to get max filedescriptors"; |
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182 | # endif |
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183 | #endif |
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184 | |
177 | |
185 | socket_info.timeout.tv_sec = 0; |
178 | if (fd >= 0) |
186 | socket_info.timeout.tv_usec = 0; |
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187 | socket_info.nconns = 0; |
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188 | |
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189 | #ifdef CS_LOGSTATS |
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190 | memset (&cst_tot, 0, sizeof (CS_Stats)); |
|
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191 | memset (&cst_lst, 0, sizeof (CS_Stats)); |
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192 | cst_tot.time_start = time (NULL); |
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193 | cst_lst.time_start = time (NULL); |
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194 | #endif |
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195 | |
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196 | LOG (llevDebug, "Initialize new client/server data\n"); |
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197 | socket_info.nconns = 1; |
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198 | init_sockets = (NewSocket *) malloc (sizeof (NewSocket)); |
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199 | init_sockets[0].faces_sent = NULL; /* unused */ |
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200 | socket_info.allocated_sockets = 1; |
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201 | |
|
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202 | protox = getprotobyname ("tcp"); |
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203 | if (protox == NULL) |
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204 | { |
179 | { |
205 | LOG (llevError, "init_ericserver: Error getting protox\n"); |
180 | send_packet ("goodbye"); |
206 | return; |
181 | flush (); |
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182 | |
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183 | close (fd); |
207 | } |
184 | } |
208 | init_sockets[0].fd = socket (PF_INET, SOCK_STREAM, protox->p_proto); |
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209 | if (init_sockets[0].fd == -1) |
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210 | { |
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211 | LOG (llevError, "Cannot create socket: %s\n", strerror (errno)); |
|
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212 | exit (-1); |
|
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213 | } |
|
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214 | insock.sin_family = AF_INET; |
|
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215 | insock.sin_port = htons (settings.csport); |
|
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216 | insock.sin_addr.s_addr = htonl (INADDR_ANY); |
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217 | |
185 | |
218 | linger_opt.l_onoff = 0; |
186 | state = ST_DEAD; |
219 | linger_opt.l_linger = 0; |
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220 | if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_LINGER, (char *) &linger_opt, sizeof (struct linger))) |
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221 | { |
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222 | LOG (llevError, "Cannot setsockopt(SO_LINGER): %s\n", strerror (errno)); |
|
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223 | } |
|
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224 | |
187 | |
225 | /* Would be nice to have an autoconf check for this. It appears that |
188 | socket_ev.stop (); |
226 | * these functions are both using the same calling syntax, just one |
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227 | * of them needs extra valus passed. |
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228 | */ |
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229 | #if defined(__osf__) || defined(hpux) || defined(sgi) || defined(NeXT) || \ |
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230 | defined(__sun__) || defined(__linux__) || defined(SVR4) || \ |
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231 | defined(__FreeBSD__) || defined(__OpenBSD__) || \ |
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232 | defined(WIN32) /* ---win32 add this here */ || \ |
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233 | defined(__GNU__) /* HURD */ |
|
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234 | { |
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235 | int tmp = 1; |
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236 | |
189 | |
237 | if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof (tmp))) |
190 | refcnt_dec (); // socket no longer open |
238 | { |
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239 | LOG (llevError, "Cannot setsockopt(SO_REUSEADDR): %s\n", strerror (errno)); |
|
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240 | } |
|
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241 | } |
|
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242 | #else |
|
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243 | if (setsockopt (init_sockets[0].fd, SOL_SOCKET, SO_REUSEADDR, (char *) NULL, 0)) |
|
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244 | { |
|
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245 | LOG (llevError, "Cannot setsockopt(SO_REUSEADDR): %s\n", strerror (errno)); |
|
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246 | } |
|
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247 | #endif |
|
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248 | |
|
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249 | if (bind (init_sockets[0].fd, (struct sockaddr *) &insock, sizeof (insock)) == (-1)) |
|
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250 | { |
|
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251 | LOG (llevError, "Cannot bind socket to port %d: %s\n", ntohs (insock.sin_port), strerror (errno)); |
|
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252 | close (init_sockets[0].fd); |
|
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253 | exit (-1); |
|
|
254 | } |
|
|
255 | if (listen (init_sockets[0].fd, 5) == (-1)) |
|
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256 | { |
|
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257 | LOG (llevError, "Cannot listen on socket: %s\n", strerror (errno)); |
|
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258 | close (init_sockets[0].fd); |
|
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259 | exit (-1); |
|
|
260 | } |
|
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261 | init_sockets[0].status = Ns_Add; |
|
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262 | read_client_images (); |
|
|
263 | } |
191 | } |
264 | |
192 | |
265 | |
|
|
266 | /******************************************************************************* |
|
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267 | * |
|
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268 | * Start of functions dealing with freeing of the data. |
|
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269 | * |
|
|
270 | ******************************************************************************/ |
|
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271 | |
|
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272 | /** Free's all the memory that ericserver allocates. */ |
|
|
273 | void |
193 | void |
274 | free_all_newserver (void) |
194 | client::reset_stats () |
275 | { |
195 | { |
276 | LOG (llevDebug, "Freeing all new client/server information.\n"); |
196 | /* we need to clear these to -1 and not zero - otherwise, |
277 | free_socket_images (); |
197 | * if a player quits and starts a new character, we wont |
278 | free (init_sockets); |
198 | * send new values to the client, as things like exp start |
279 | } |
199 | * at zero. |
280 | |
|
|
281 | /** |
|
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282 | * Frees a socket. |
|
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283 | * Basically, all we need to do here is free all data structures that |
|
|
284 | * might be associated with the socket. It is up to the caller to |
|
|
285 | * update the list |
|
|
286 | */ |
200 | */ |
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201 | for (int i = 0; i < NUM_SKILLS; i++) |
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202 | last_skill_exp[i] = -1; |
287 | |
203 | |
288 | void |
204 | for (int i = 0; i < NROFATTACKS; i++) |
289 | free_newsocket (NewSocket * ns) |
205 | last_resist[i] = -1; |
290 | { |
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291 | if (close (ns->fd)) |
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292 | { |
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293 | |
206 | |
294 | #ifdef ESRV_DEBUG |
207 | last_weapon_sp = -1; |
295 | LOG (llevDebug, "Error closing socket %d\n", ns->fd); |
208 | last_level = -1; |
296 | #endif |
209 | last_stats.exp = -1; |
297 | } |
210 | last_flags = 0; |
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211 | last_weight = -1; |
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212 | last_weight_limit = 0; |
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213 | last_path_attuned = 0; |
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214 | last_path_repelled = 0; |
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215 | last_path_denied = 0; |
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216 | last_speed = 0; |
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217 | last_flags = 0; |
298 | |
218 | |
299 | if (ns->stats.range) |
219 | static living zero_living; |
300 | free (ns->stats.range); |
220 | last_stats = zero_living; |
301 | |
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302 | if (ns->stats.title) |
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303 | free (ns->stats.title); |
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304 | |
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305 | free (ns->host); |
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306 | free (ns->inbuf.buf); |
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307 | } |
221 | } |
308 | |
222 | |
309 | /** Sends the 'goodbye' command to the player, and closes connection. */ |
223 | client * |
310 | void |
224 | client::create (int fd, const char *peername) |
311 | final_free_player (player *pl) |
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312 | { |
225 | { |
313 | cs_write_string (&pl->socket, "goodbye", 8); |
226 | client *ns = new client (dup (fd), peername); |
314 | free_newsocket (&pl->socket); |
227 | ns->instantiate (); // effectively a nop right now |
315 | free_player (pl); |
228 | INVOKE_CLIENT (CONNECT, ns); |
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229 | return ns; |
316 | } |
230 | } |
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231 | |