1 | |
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2 | /* |
1 | /* |
3 | * static char *rcsid_sockets_c = |
2 | * CrossFire, A Multiplayer game for X-windows |
4 | * "$Id: lowlevel.C,v 1.3 2006/08/29 08:01:38 root Exp $"; |
3 | * |
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4 | * Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team |
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5 | * Copyright (C) 1992 Frank Tore Johansen |
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6 | * |
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7 | * This program is free software; you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation; either version 2 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program; if not, write to the Free Software |
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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 |
5 | */ |
22 | */ |
6 | |
23 | |
7 | /* |
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8 | CrossFire, A Multiplayer game for X-windows |
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9 | |
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10 | Copyright (C) 1992 Frank Tore Johansen |
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11 | |
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12 | This program is free software; you can redistribute it and/or modify |
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13 | it under the terms of the GNU General Public License as published by |
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14 | the Free Software Foundation; either version 2 of the License, or |
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15 | (at your option) any later version. |
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16 | |
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17 | This program is distributed in the hope that it will be useful, |
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18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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20 | GNU General Public License for more details. |
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21 | |
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22 | You should have received a copy of the GNU General Public License |
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23 | along with this program; if not, write to the Free Software |
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24 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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25 | |
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26 | The author can be reached via e-mail to mark@pyramid.com |
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27 | */ |
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28 | |
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29 | /** |
24 | /** |
30 | * \file |
25 | * \file |
31 | * Low-level socket-related functions. |
26 | * Low-level socket-related functions. |
32 | * |
27 | * |
33 | * \date 2003-12-02 |
28 | * \date 2003-12-02 |
… | |
… | |
39 | */ |
34 | */ |
40 | |
35 | |
41 | using namespace std; |
36 | using namespace std; |
42 | |
37 | |
43 | #include <global.h> |
38 | #include <global.h> |
44 | #include <newclient.h> |
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45 | #include <sproto.h> |
39 | #include <sproto.h> |
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40 | #include <cstdarg> |
46 | |
41 | |
47 | #ifdef __linux__ |
42 | #ifdef __linux__ |
48 | # include <sys/types.h> |
43 | # include <sys/types.h> |
49 | # include <sys/socket.h> |
44 | # include <sys/socket.h> |
50 | # include <netinet/in.h> |
45 | # include <netinet/in.h> |
51 | # define TCP_HZ 1000 // sorry... |
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52 | # include <netinet/tcp.h> |
46 | # include <netinet/tcp.h> |
53 | #endif |
47 | #endif |
54 | |
48 | |
55 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
49 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
56 | // easily die in 20 seconds... |
50 | // easily die in 20 seconds... |
57 | #define SOCKET_TIMEOUT1 10 |
51 | #define SOCKET_TIMEOUT1 10 * 1000 |
58 | #define SOCKET_TIMEOUT2 20 |
52 | #define SOCKET_TIMEOUT2 20 * 1000 |
59 | |
53 | |
60 | void Socket_Flush (NewSocket *ns) |
54 | void |
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55 | client::flush () |
61 | { |
56 | { |
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57 | if (destroyed ()) |
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58 | return; |
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59 | |
62 | #ifdef __linux__ |
60 | #ifdef __linux__ |
63 | // check time of last ack, and, if too old, kill connection |
61 | // check time of last ack, and, if too old, kill connection |
64 | struct tcp_info tcpi; |
62 | struct tcp_info tcpi; |
65 | socklen_t len = sizeof (tcpi); |
63 | socklen_t len = sizeof (tcpi); |
66 | |
64 | |
67 | if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
65 | if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
68 | { |
66 | { |
69 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
67 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
70 | |
68 | |
71 | if (tcpi.tcpi_unacked |
69 | rtt = tcpi.tcpi_rtt; |
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70 | rttvar = tcpi.tcpi_rttvar; |
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71 | |
72 | && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s |
72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s |
73 | && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s |
73 | && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s |
74 | { |
74 | { |
75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, |
75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, |
76 | (unsigned)tcpi.tcpi_last_ack_recv, (unsigned)tcpi.tcpi_last_data_sent, (unsigned)tcpi.tcpi_unacked); |
76 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
77 | ns->status = Ns_Dead; |
77 | destroy (); |
78 | } |
78 | } |
79 | } |
79 | } |
80 | |
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81 | int val; |
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82 | val = 0; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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83 | val = 1; setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
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84 | #endif |
80 | #endif |
85 | } |
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86 | |
81 | |
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82 | /** |
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83 | * Writes data to socket. |
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84 | * |
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85 | * When the socket is clear to write, and we have backlogged data, this |
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86 | * is called to write it out. |
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87 | */ |
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88 | |
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89 | if (!outputbuffer.len || socket_ev.poll () & PE_W) |
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90 | return; |
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91 | |
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92 | write_outputbuffer (); |
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93 | } |
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94 | |
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95 | void |
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96 | client::write_outputbuffer () |
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97 | { |
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98 | while (outputbuffer.len) |
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99 | { |
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100 | int res = write (fd, outputbuffer.data + outputbuffer.start, |
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101 | min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); |
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102 | |
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103 | if (res > 0) |
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104 | { |
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105 | outputbuffer.start += res; |
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106 | /* wrap back to start of buffer */ |
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107 | if (outputbuffer.start == SOCKETBUFSIZE) |
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108 | outputbuffer.start = 0; |
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109 | |
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110 | outputbuffer.len -= res; |
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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 | } |
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116 | else if (res == 0) |
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117 | { |
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118 | LOG (llevError, "socket write failed, connection closed.\n"); |
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119 | destroy (); |
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120 | return; |
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121 | } |
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122 | else if (errno == EINTR) |
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123 | { |
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124 | // just retry |
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125 | } |
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126 | else if (errno == EAGAIN) |
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127 | { |
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128 | // delay till ready |
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129 | socket_ev.poll (socket_ev.poll () | PE_W); |
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130 | socket_ev.start (); |
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131 | return; |
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132 | } |
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133 | else |
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134 | { |
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135 | LOG (llevError, "socket write failed: %s\n", strerror (errno)); |
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136 | destroy (); |
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137 | return; |
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138 | } |
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139 | } |
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140 | |
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141 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
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142 | } |
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143 | |
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144 | /****************************************************************************** |
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145 | * |
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146 | * Start of read routines. |
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147 | * |
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148 | ******************************************************************************/ |
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149 | |
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150 | int |
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151 | client::next_packet () |
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152 | { |
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153 | if (inbuf_len >= 2) |
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154 | { |
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155 | int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
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156 | |
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157 | if (inbuf_len >= 2 + pkt_len) |
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158 | return 2 + pkt_len; |
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159 | |
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160 | if (inbuf_len == sizeof (inbuf)) |
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161 | { |
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162 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED); |
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163 | destroy (); |
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164 | return -1; |
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165 | } |
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166 | } |
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167 | |
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168 | return 0; |
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169 | } |
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170 | |
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171 | void |
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172 | client::skip_packet (int len) |
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173 | { |
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174 | inbuf_len -= len; |
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175 | memmove (inbuf, inbuf + len, inbuf_len); |
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176 | } |
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177 | |
87 | /*********************************************************************** |
178 | /***************************************************************************** |
88 | * |
179 | * Start of command dispatch area. |
89 | * SockList functions/utilities |
180 | * The commands here are protocol commands. |
90 | * |
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91 | **********************************************************************/ |
181 | ****************************************************************************/ |
92 | |
182 | |
93 | void SockList_Init(SockList *sl) |
183 | // SocketCommand, PlayingCommand, should not exist with those ugly casts |
94 | { |
184 | #define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb), |
95 | sl->len=0; |
185 | #define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | |
96 | sl->buf=NULL; |
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97 | } |
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98 | |
186 | |
99 | void SockList_AddInt(SockList *sl, uint32 data) |
187 | /** |
100 | { |
188 | * Dispatch table for the server. |
101 | sl->buf[sl->len++]= (data>>24)&0xff; |
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102 | sl->buf[sl->len++]= (data>>16)&0xff; |
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103 | sl->buf[sl->len++]= (data>>8)&0xff; |
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104 | sl->buf[sl->len++] = data & 0xff; |
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105 | } |
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106 | |
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107 | void SockList_AddInt64(SockList *sl, uint64 data) |
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108 | { |
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109 | sl->buf[sl->len++]= ( char )( (data>>56)&0xff ); |
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110 | sl->buf[sl->len++]= ( char )( (data>>48)&0xff ); |
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111 | sl->buf[sl->len++]= ( char )( (data>>40)&0xff ); |
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112 | sl->buf[sl->len++]= ( char )( (data>>32)&0xff ); |
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113 | |
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114 | sl->buf[sl->len++]= ( char )( (data>>24)&0xff ); |
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115 | sl->buf[sl->len++]= ( char )( (data>>16)&0xff ); |
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116 | sl->buf[sl->len++]= ( char )( (data>>8)&0xff ); |
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117 | sl->buf[sl->len++] =( char )( data & 0xff ); |
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118 | } |
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119 | |
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120 | /* Basically does the reverse of SockList_AddInt, but on |
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121 | * strings instead. Same for the GetShort, but for 16 bits. |
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122 | */ |
189 | */ |
123 | int GetInt_String(unsigned char *data) |
190 | static struct packet_type packets[] = { |
124 | { |
191 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
125 | return ((data[0]<<24) + (data[1]<<16) + (data[2]<<8) + data[3]); |
192 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
126 | } |
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127 | |
193 | |
128 | short GetShort_String(unsigned char *data) { |
194 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
129 | return ((data[0]<<8)+data[1]); |
195 | {"ex", PC(ExCmd) PF_PLAYING }, |
130 | } |
196 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
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197 | {"lookat", PC(LookAt) PF_PLAYING }, |
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198 | {"lock", PC(LockItem) PF_PLAYING }, |
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199 | {"mark", PC(MarkItem) PF_PLAYING }, |
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200 | {"move", PC(MoveCmd) PF_PLAYING }, |
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201 | {"ext", PC(ExtCmd) 0 }, // CF+ |
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202 | {"mapredraw", PC(MapRedrawCmd) 0 }, |
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203 | {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
131 | |
204 | |
132 | /****************************************************************************** |
205 | {"reply", SC(ReplyCmd) 0 }, |
133 | * |
206 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
134 | * Start of read routines. |
207 | {"addme", SC(AddMeCmd) 0 }, |
135 | * |
208 | {"askface", SC(AskFaceCmd) 0 }, |
136 | ******************************************************************************/ |
209 | {"requestinfo", SC(RequestInfo) 0 }, |
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210 | {"setfacemode", SC(SetFaceMode) 0 }, |
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211 | {"setsound", SC(SetSound) 0 }, |
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212 | {"setup", SC(SetUp) 0 }, |
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213 | {"version", SC(VersionCmd) 0 }, |
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214 | {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
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215 | {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
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216 | {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
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217 | }; |
137 | |
218 | |
138 | /** |
219 | bool |
139 | * This reads from fd and puts the data in sl. We return true if we think |
220 | client::may_execute (const packet_type *pkt) const |
140 | * we have a full packet, 0 if we have a partial packet. The only processing |
221 | { |
141 | * we do is remove the intial size value. len (As passed) is the size of the |
222 | return (!(pkt->flags & PF_PLAYER) || pl) |
142 | * buffer allocated in the socklist. We make the assumption the buffer is |
223 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
143 | * at least 2 bytes long. |
224 | } |
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225 | |
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226 | // HACK: some commands currently should be executed |
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227 | // even when the player is frozen. this hack detects |
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228 | // those commands. it should be folded into may_execute, |
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229 | // but kept seperate to emphasise the hack aspect, i.e. |
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230 | // do it better, then remove. |
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231 | static bool |
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232 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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233 | { |
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234 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
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235 | return false; |
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236 | |
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237 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
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238 | return false; |
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239 | |
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240 | if (pkt->flags & PF_COMMAND6) |
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241 | { |
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242 | data += 6; |
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243 | len -= 6; |
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244 | } |
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245 | |
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246 | if (len > 4 && !strncmp (data, "say " , 4)) |
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247 | return true; |
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248 | if (len > 5 && !strncmp (data, "chat ", 5)) |
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249 | return true; |
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250 | |
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251 | return false; |
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252 | } |
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253 | |
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254 | void |
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255 | client::execute (const packet_type *pkt, char *data, int datalen) |
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256 | { |
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257 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
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258 | { |
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259 | //TODO: only one format |
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260 | if (pkt->flags & PF_PLAYER) |
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261 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
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262 | else |
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263 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
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264 | } |
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265 | else |
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266 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name); |
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267 | } |
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268 | |
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269 | bool |
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270 | client::handle_packet () |
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271 | { |
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272 | int pkt_len = next_packet (); |
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273 | |
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274 | if (!pkt_len) |
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275 | return false; |
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276 | else if (pkt_len < 0) |
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277 | { |
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278 | LOG (llevError, "read error on player %s\n", |
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279 | pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
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280 | destroy (); |
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281 | return false; |
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282 | } |
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283 | |
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284 | inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
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285 | |
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286 | /* First, break out beginning word. There are at least |
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287 | * a few commands that do not have any paremeters. If |
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288 | * we get such a command, don't worry about trying |
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289 | * to break it up. |
144 | */ |
290 | */ |
145 | |
291 | int datalen; |
146 | int SockList_ReadPacket(int fd, SockList *sl, int len) |
292 | char *data = strchr ((char *)inbuf + 2, ' '); |
147 | { |
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148 | int stat,toread; |
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149 | |
293 | |
150 | /* Sanity check - shouldn't happen */ |
294 | if (data) |
151 | if (sl->len < 0) { |
295 | { |
152 | abort(); |
296 | *data++ = 0; |
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297 | datalen = pkt_len - (data - (char *)inbuf); |
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298 | } |
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299 | else |
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300 | { |
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301 | data = (char *)inbuf + 2; // better read garbage than segfault |
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302 | datalen = 0; |
|
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303 | } |
|
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304 | |
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305 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
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306 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
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307 | { |
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308 | if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
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309 | queue_command (pkt, data, datalen); |
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310 | else |
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311 | execute (pkt, data, datalen); |
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312 | |
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313 | goto next_packet; |
153 | } |
314 | } |
154 | /* We already have a partial packet */ |
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155 | if (sl->len<2) { |
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156 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */ |
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157 | |
315 | |
158 | stat=recv(fd, sl->buf + sl->len, 2-sl->len,0); |
316 | // If we get here, we didn't find a valid command. |
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317 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2); |
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318 | next_packet: |
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319 | skip_packet (pkt_len); |
159 | |
320 | |
160 | #else |
321 | // input buffer has space again |
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322 | socket_ev.poll (socket_ev.poll () | PE_R); |
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323 | |
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324 | return true; |
|
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325 | } |
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326 | |
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327 | // callback called when socket is either readable or writable |
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328 | void |
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329 | client::socket_cb (iow &w, int got) |
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330 | { |
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331 | //TODO remove when we have better socket cleanup logic |
|
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332 | if (destroyed ()) |
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333 | { |
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334 | socket_ev.poll (0); |
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335 | return; |
|
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336 | } |
|
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337 | |
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338 | if (got & PE_W) |
|
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339 | { |
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340 | write_outputbuffer (); |
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341 | |
|
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342 | if (!outputbuffer.len) |
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343 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
|
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344 | } |
|
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345 | |
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346 | if (got & PE_R) |
|
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347 | { |
|
|
348 | //TODO: rate-limit tcp connection in better ways, important |
|
|
349 | |
|
|
350 | int amount = sizeof (inbuf) - inbuf_len; |
|
|
351 | |
|
|
352 | if (!amount) |
161 | do { |
353 | { |
162 | stat=read(fd, sl->buf + sl->len, 2-sl->len); |
354 | // input buffer full |
163 | } while ((stat==-1) && (errno==EINTR)); |
355 | socket_ev.poll (socket_ev.poll () & ~PE_R); |
164 | #endif |
356 | return; |
165 | if (stat<0) { |
357 | } |
166 | /* In non blocking mode, EAGAIN is set when there is no |
358 | |
167 | * data available. |
359 | amount = read (fd, inbuf + inbuf_len, amount); |
168 | */ |
360 | |
169 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ |
361 | if (!amount) |
170 | if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { |
362 | { |
171 | if(WSAGetLastError() == WSAECONNRESET) |
363 | destroy (); |
172 | LOG(llevDebug,"Connection closed by client\n"); |
364 | return; |
173 | else |
365 | } |
|
|
366 | else if (amount < 0) |
|
|
367 | { |
|
|
368 | if (errno != EAGAIN && errno != EINTR) |
174 | { |
369 | { |
175 | LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); |
370 | LOG (llevError, "read error: %s\n", strerror (errno)); |
176 | } |
371 | destroy (); |
177 | return -1; /* kick this user! */ |
372 | return; |
178 | } |
373 | } |
179 | #else |
374 | |
180 | if (errno != EAGAIN && errno !=EWOULDBLOCK) { |
375 | // should not be here, normally |
181 | LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); |
|
|
182 | } |
376 | } |
183 | #endif |
377 | else |
184 | return 0; /*Error */ |
|
|
185 | } |
378 | { |
186 | if (stat==0) return -1; |
379 | inbuf_len += amount; |
187 | sl->len += stat; |
380 | |
188 | #ifdef CS_LOGSTATS |
|
|
189 | cst_tot.ibytes += stat; |
381 | cst_tot.ibytes += amount; |
190 | cst_lst.ibytes += stat; |
382 | cst_lst.ibytes += amount; |
191 | #endif |
|
|
192 | if (stat<2) return 0; /* Still don't have a full packet */ |
|
|
193 | } |
|
|
194 | /* Figure out how much more data we need to read. Add 2 from the |
|
|
195 | * end of this - size header information is not included. |
|
|
196 | */ |
|
|
197 | toread = 2+(sl->buf[0] << 8) + sl->buf[1] - sl->len; |
|
|
198 | if ((toread + sl->len) >= len) { |
|
|
199 | LOG(llevError,"SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", |
|
|
200 | toread + sl->len, len); |
|
|
201 | /* Quick hack in case for 'oldsocketmode' input. If we are |
|
|
202 | * closing the socket anyways, then reading this extra 100 bytes |
|
|
203 | * shouldn't hurt. |
|
|
204 | */ |
|
|
205 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
|
|
206 | recv(fd, sl->buf+2, 100, 0); |
|
|
207 | #else |
|
|
208 | read(fd, sl->buf+2, 100); |
|
|
209 | #endif /* end win32 */ |
|
|
210 | |
383 | |
211 | /* return error so the socket is closed */ |
384 | cmd_ev.start (); |
212 | return -1; |
|
|
213 | } |
|
|
214 | do { |
|
|
215 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
|
|
216 | stat = recv(fd, sl->buf+ sl->len, toread, 0); |
|
|
217 | #else |
|
|
218 | do { |
|
|
219 | stat = read(fd, sl->buf+ sl->len, toread); |
|
|
220 | } while ((stat<0) && (errno==EINTR)); |
|
|
221 | #endif |
|
|
222 | if (stat<0) { |
|
|
223 | |
|
|
224 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */ |
|
|
225 | if ((stat==-1) && WSAGetLastError() !=WSAEWOULDBLOCK) { |
|
|
226 | if(WSAGetLastError() == WSAECONNRESET) |
|
|
227 | LOG(llevDebug,"Connection closed by client\n"); |
|
|
228 | else |
|
|
229 | { |
|
|
230 | LOG(llevDebug,"ReadPacket got error %d, returning 0\n",WSAGetLastError()); |
|
|
231 | } |
|
|
232 | return -1; /* kick this user! */ |
|
|
233 | } |
385 | } |
234 | #else |
386 | } |
235 | if (errno != EAGAIN && errno !=EWOULDBLOCK) { |
387 | } |
236 | LOG(llevDebug, "ReadPacket got error %s, returning 0\n", strerror_local(errno)); |
388 | |
237 | } |
389 | // called whenever we have additional commands to process |
238 | #endif |
390 | void |
239 | return 0; /*Error */ |
391 | client::cmd_cb (iw &w) |
240 | } |
392 | { |
241 | if (stat==0) return -1; |
393 | if (handle_packet ()) |
242 | sl->len += stat; |
394 | w.start (); |
243 | #ifdef CS_LOGSTATS |
395 | else |
244 | cst_tot.ibytes += stat; |
396 | flush (); |
245 | cst_lst.ibytes += stat; |
|
|
246 | #endif |
|
|
247 | toread -= stat; |
|
|
248 | if (toread==0) return 1; |
|
|
249 | if (toread < 0) { |
|
|
250 | LOG(llevError,"SockList_ReadPacket: Read more bytes than desired.\n"); |
|
|
251 | return 1; |
|
|
252 | } |
|
|
253 | } while (toread>0); |
|
|
254 | return 0; |
|
|
255 | } |
397 | } |
256 | |
398 | |
257 | /******************************************************************************* |
399 | /******************************************************************************* |
258 | * |
400 | * |
259 | * Start of write related routines. |
401 | * Start of write related routines. |
… | |
… | |
264 | * Adds data to a socket buffer for whatever reason. |
406 | * Adds data to a socket buffer for whatever reason. |
265 | * |
407 | * |
266 | * ns is the socket we are adding the data to, buf is the start of the |
408 | * ns is the socket we are adding the data to, buf is the start of the |
267 | * data, and len is the number of bytes to add. |
409 | * data, and len is the number of bytes to add. |
268 | */ |
410 | */ |
269 | |
411 | void |
270 | static void add_to_buffer(NewSocket *ns, char *buf, int len) |
412 | client::send (void *buf_, int len) |
271 | { |
413 | { |
|
|
414 | char *buf = (char *)buf_; |
|
|
415 | |
|
|
416 | if (destroyed () || !buf) |
|
|
417 | return; |
|
|
418 | |
|
|
419 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
|
|
420 | { |
|
|
421 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
|
|
422 | // shutdown the socket, this is safer than destroying it immediately |
|
|
423 | // as lots of code in the callchain might still access the map etc. |
|
|
424 | shutdown (fd, SHUT_RDWR); |
|
|
425 | return; |
|
|
426 | } |
|
|
427 | |
272 | int avail, end; |
428 | int avail, end; |
273 | |
429 | |
274 | if ((len+ns->outputbuffer.len)>SOCKETBUFSIZE) { |
|
|
275 | LOG(llevDebug,"Socket on fd %d has overrun internal buffer - marking as dead\n", |
|
|
276 | ns->fd); |
|
|
277 | ns->status = Ns_Dead; |
|
|
278 | return; |
|
|
279 | } |
|
|
280 | |
|
|
281 | /* data + end is where we start putting the new data. The last byte |
430 | /* data + end is where we start putting the new data. The last byte |
282 | * currently in use is actually data + end -1 |
431 | * currently in use is actually data + end -1 |
283 | */ |
432 | */ |
284 | |
|
|
285 | end=ns->outputbuffer.start + ns->outputbuffer.len; |
433 | end = outputbuffer.start + outputbuffer.len; |
286 | /* The buffer is already in a wrapped state, so adjust end */ |
434 | /* The buffer is already in a wrapped state, so adjust end */ |
287 | if (end>=SOCKETBUFSIZE) end-=SOCKETBUFSIZE; |
435 | if (end >= SOCKETBUFSIZE) |
|
|
436 | end -= SOCKETBUFSIZE; |
|
|
437 | |
288 | avail=SOCKETBUFSIZE - end; |
438 | avail = SOCKETBUFSIZE - end; |
289 | |
439 | |
290 | /* We can all fit it behind the current data without wrapping */ |
440 | /* We can all fit it behind the current data without wrapping */ |
291 | if (avail >=len ) { |
441 | if (avail >= len) |
292 | memcpy(ns->outputbuffer.data + end, buf, len); |
442 | memcpy (outputbuffer.data + end, buf, len); |
|
|
443 | else |
293 | } |
444 | { |
294 | else { |
|
|
295 | memcpy(ns->outputbuffer.data + end, buf, avail); |
445 | memcpy (outputbuffer.data + end, buf, avail); |
296 | memcpy(ns->outputbuffer.data, buf+avail, len-avail); |
446 | memcpy (outputbuffer.data, buf + avail, len - avail); |
297 | } |
447 | } |
|
|
448 | |
298 | ns->outputbuffer.len += len; |
449 | outputbuffer.len += len; |
299 | #if 0 |
|
|
300 | LOG(llevDebug,"Added %d to output buffer, total length now %d, start=%d\n", len, |
|
|
301 | ns->outputbuffer.len, ns->outputbuffer.start); |
|
|
302 | #endif |
|
|
303 | } |
450 | } |
304 | |
|
|
305 | /** |
|
|
306 | * Writes data to socket. |
|
|
307 | * |
|
|
308 | * When the socket is clear to write, and we have backlogged data, this |
|
|
309 | * is called to write it out. |
|
|
310 | */ |
|
|
311 | void write_socket_buffer(NewSocket *ns) |
|
|
312 | { |
|
|
313 | int amt, max; |
|
|
314 | |
|
|
315 | if (ns->outputbuffer.len==0) { |
|
|
316 | LOG(llevDebug,"write_socket_buffer called when there is no data, fd=%d\n", |
|
|
317 | ns->fd); |
|
|
318 | return; |
|
|
319 | } |
|
|
320 | |
|
|
321 | do { |
|
|
322 | max = SOCKETBUFSIZE - ns->outputbuffer.start; |
|
|
323 | if (ns->outputbuffer.len<max) max = ns->outputbuffer.len; |
|
|
324 | |
|
|
325 | #ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */ |
|
|
326 | amt=send(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max,0); |
|
|
327 | #else |
|
|
328 | do { |
|
|
329 | amt=write(ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
|
|
330 | } while ((amt<0) && (errno==EINTR)); |
|
|
331 | #endif |
|
|
332 | |
|
|
333 | if (amt < 0) { /* We got an error */ |
|
|
334 | |
|
|
335 | #ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */ |
|
|
336 | if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) { |
|
|
337 | LOG(llevError,"New socket write failed (wsb) (%d).\n", WSAGetLastError()); |
|
|
338 | #else |
|
|
339 | if (errno !=EWOULDBLOCK) { |
|
|
340 | LOG(llevError,"New socket write failed (wsb) (%d: %s).\n", |
|
|
341 | errno, strerror_local(errno)); |
|
|
342 | #endif |
|
|
343 | ns->status=Ns_Dead; |
|
|
344 | return; |
|
|
345 | } |
|
|
346 | else { /* EWOULDBLOCK */ |
|
|
347 | /* can't write it, so store it away. */ |
|
|
348 | ns->can_write=0; |
|
|
349 | return; |
|
|
350 | } |
|
|
351 | } |
|
|
352 | ns->outputbuffer.start += amt; |
|
|
353 | /* wrap back to start of buffer */ |
|
|
354 | if (ns->outputbuffer.start==SOCKETBUFSIZE) ns->outputbuffer.start=0; |
|
|
355 | ns->outputbuffer.len -= amt; |
|
|
356 | #ifdef CS_LOGSTATS |
|
|
357 | cst_tot.obytes += amt; |
|
|
358 | cst_lst.obytes += amt; |
|
|
359 | #endif |
|
|
360 | } while (ns->outputbuffer.len>0); |
|
|
361 | } |
|
|
362 | |
|
|
363 | /** |
|
|
364 | * This writes data to the socket. - It is very low level - |
|
|
365 | * all we try and do is write out the data to the socket |
|
|
366 | * provided (ns). buf is the data to write, len is the number |
|
|
367 | * of bytes to write. IT doesn't return anything - rather, it |
|
|
368 | * updates the ns structure if we get an error. |
|
|
369 | */ |
|
|
370 | void Write_To_Socket(NewSocket *ns, char *buf, int len) |
|
|
371 | { |
|
|
372 | int amt=0; |
|
|
373 | char *pos=buf; |
|
|
374 | |
|
|
375 | if (ns->status == Ns_Dead || !buf) { |
|
|
376 | LOG(llevDebug,"Write_To_Socket called with dead socket\n"); |
|
|
377 | return; |
|
|
378 | } |
|
|
379 | |
|
|
380 | #ifndef __GNU__ /* This caused problems on Hurd */ |
|
|
381 | if (!ns->can_write) { |
|
|
382 | add_to_buffer(ns, buf, len); |
|
|
383 | return; |
|
|
384 | } |
|
|
385 | #endif |
|
|
386 | /* If we manage to write more than we wanted, take it as a bonus */ |
|
|
387 | while (len>0) { |
|
|
388 | |
|
|
389 | #ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */ |
|
|
390 | amt=send(ns->fd, pos, len,0); |
|
|
391 | #else |
|
|
392 | do { |
|
|
393 | amt=write(ns->fd, pos, len); |
|
|
394 | } while ((amt<0) && (errno==EINTR)); |
|
|
395 | #endif |
|
|
396 | |
|
|
397 | if (amt < 0) { /* We got an error */ |
|
|
398 | #ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */ |
|
|
399 | if (amt == -1 && WSAGetLastError() !=WSAEWOULDBLOCK) { |
|
|
400 | LOG(llevError,"New socket write failed WTS (%d).\n",WSAGetLastError()); |
|
|
401 | #else |
|
|
402 | if (errno !=EWOULDBLOCK) { |
|
|
403 | LOG(llevError,"New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
|
|
404 | errno, strerror_local(errno)); |
|
|
405 | #endif |
|
|
406 | ns->status=Ns_Dead; |
|
|
407 | return; |
|
|
408 | } |
|
|
409 | else { /* EWOULDBLOCK */ |
|
|
410 | /* can't write it, so store it away. */ |
|
|
411 | add_to_buffer(ns, pos, len); |
|
|
412 | ns->can_write=0; |
|
|
413 | return; |
|
|
414 | } |
|
|
415 | } |
|
|
416 | /* amt gets set to 0 above in blocking code, so we do this as |
|
|
417 | * an else if to make sure we don't reprocess it. |
|
|
418 | */ |
|
|
419 | else if (amt==0) { |
|
|
420 | LOG(llevError,"Write_To_Socket: No data written out.\n"); |
|
|
421 | } |
|
|
422 | len -= amt; |
|
|
423 | pos += amt; |
|
|
424 | #ifdef CS_LOGSTATS |
|
|
425 | cst_tot.obytes += amt; |
|
|
426 | cst_lst.obytes += amt; |
|
|
427 | #endif |
|
|
428 | } |
|
|
429 | } |
|
|
430 | |
|
|
431 | |
451 | |
432 | /** |
452 | /** |
433 | * Takes a string of data, and writes it out to the socket. A very handy |
453 | * Takes a string of data, and writes it out to the socket. A very handy |
434 | * shortcut function. |
454 | * shortcut function. |
435 | */ |
455 | */ |
436 | void cs_write_string(NewSocket *ns, const char *buf, int len) |
456 | void |
|
|
457 | client::send_packet (packet &sl) |
437 | { |
458 | { |
438 | SockList sl; |
459 | if (destroyed ()) |
439 | |
|
|
440 | sl.len = len; |
|
|
441 | sl.buf = (unsigned char*)buf; |
|
|
442 | Send_With_Handling(ns, &sl); |
|
|
443 | } |
|
|
444 | |
|
|
445 | |
|
|
446 | /** |
|
|
447 | * Calls Write_To_Socket to send data to the client. |
|
|
448 | * |
|
|
449 | * The only difference in this function is that we take a SockList |
|
|
450 | *, and we prepend the length information. |
|
|
451 | */ |
|
|
452 | void Send_With_Handling(NewSocket *ns,SockList *msg) |
|
|
453 | { |
|
|
454 | unsigned char sbuf[4]; |
|
|
455 | |
|
|
456 | if (ns->status == Ns_Dead || !msg) |
|
|
457 | return; |
460 | return; |
458 | |
461 | |
459 | if (msg->len >= MAXSOCKBUF) { |
462 | if (sl.length () >= MAXSOCKBUF) |
|
|
463 | { |
460 | LOG(llevError,"Trying to send a buffer beyond properly size, len =%d\n", |
464 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
461 | msg->len); |
|
|
462 | /* Almost certainly we've overflowed a buffer, so quite now to make |
465 | /* Almost certainly we've overflowed a buffer, so quit now to make |
463 | * it easier to debug. |
466 | * it easier to debug. |
464 | */ |
467 | */ |
465 | abort(); |
468 | abort (); |
466 | } |
469 | } |
467 | sbuf[0] = ((uint32)(msg->len) >> 8) & 0xFF; |
|
|
468 | sbuf[1] = ((uint32)(msg->len)) & 0xFF; |
|
|
469 | if (ns->status != Ns_Old) |
|
|
470 | Write_To_Socket(ns, (char *) sbuf, 2); |
|
|
471 | Write_To_Socket(ns, (char*)msg->buf, msg->len); |
|
|
472 | } |
|
|
473 | |
470 | |
474 | /** |
471 | if (!sl.length ()) |
475 | * Takes a string of data, and writes it out to the socket. A very handy |
472 | return; |
476 | * shortcut function. |
473 | |
|
|
474 | assert (sl.hdrlen == 2); |
|
|
475 | |
|
|
476 | sl.buf_ [0] = sl.length () >> 8; |
|
|
477 | sl.buf_ [1] = sl.length () ; |
|
|
478 | |
|
|
479 | send (sl.buf_, sl.length () + sl.hdrlen); |
|
|
480 | } |
|
|
481 | |
|
|
482 | void |
|
|
483 | client::send_packet (const char *buf, int len) |
|
|
484 | { |
|
|
485 | packet sl; |
|
|
486 | |
|
|
487 | sl << data (buf, len); |
|
|
488 | send_packet (sl); |
|
|
489 | } |
|
|
490 | |
|
|
491 | void |
|
|
492 | client::send_packet (const char *buf) |
|
|
493 | { |
|
|
494 | send_packet (buf, strlen (buf)); |
|
|
495 | } |
|
|
496 | |
|
|
497 | void |
|
|
498 | client::send_packet_printf (const char *format, ...) |
|
|
499 | { |
|
|
500 | packet sl; |
|
|
501 | |
|
|
502 | va_list ap; |
|
|
503 | va_start (ap, format); |
|
|
504 | sl.vprintf (format, ap); |
|
|
505 | va_end (ap); |
|
|
506 | |
|
|
507 | send_packet (sl); |
|
|
508 | } |
|
|
509 | |
|
|
510 | void |
|
|
511 | client::send_drawinfo (const char *msg, int flags) |
|
|
512 | { |
|
|
513 | send_packet_printf ("drawinfo %d %s", flags, msg); |
|
|
514 | } |
|
|
515 | |
|
|
516 | /*********************************************************************** |
477 | */ |
517 | * |
478 | void Write_String_To_Socket(NewSocket *ns, char *buf, int len) |
518 | * packet functions/utilities |
479 | { |
519 | * |
480 | SockList sl; |
520 | **********************************************************************/ |
481 | |
521 | |
482 | sl.len = len; |
522 | packet::packet (const char *name) |
483 | sl.buf = (unsigned char*) buf; |
523 | { |
484 | Send_With_Handling(ns, &sl); |
524 | reset (); |
485 | } |
|
|
486 | |
525 | |
|
|
526 | int len = strlen (name); |
|
|
527 | memcpy (cur, name, len); cur += len; |
|
|
528 | *cur++ = ' '; |
|
|
529 | } |
|
|
530 | |
|
|
531 | packet &packet::operator <<(const ber32 v) |
|
|
532 | { |
|
|
533 | enum { maxlen = 32 / 7 + 1}; |
|
|
534 | uint8 buf[maxlen]; |
|
|
535 | uint8 *p = buf + maxlen; |
|
|
536 | uint32 val = v.val; |
|
|
537 | |
|
|
538 | *--p = val & 0x7F; |
|
|
539 | |
|
|
540 | while (val > 0x7F) |
|
|
541 | { |
|
|
542 | val >>= 7; |
|
|
543 | *--p = (val & 0x7F) | 0x80; |
|
|
544 | } |
|
|
545 | |
|
|
546 | return *this << data (p, buf + maxlen - p); |
|
|
547 | } |
|
|
548 | |
|
|
549 | packet &packet::operator <<(const data &v) |
|
|
550 | { |
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551 | if (room () < v.len) |
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|
552 | reset (); |
|
|
553 | else |
|
|
554 | { |
|
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555 | if (v.len) |
|
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556 | { |
|
|
557 | memcpy (cur, v.ptr, v.len); |
|
|
558 | cur += v.len; |
|
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559 | } |
|
|
560 | } |
|
|
561 | |
|
|
562 | return *this; |
|
|
563 | } |
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|
564 | |
|
|
565 | packet &packet::operator <<(const data8 &v) |
|
|
566 | { |
|
|
567 | unsigned int len = min (v.len, 0x00FF); |
|
|
568 | return *this << uint8 (len) << data (v.ptr, len); |
|
|
569 | } |
|
|
570 | |
|
|
571 | packet &packet::operator <<(const data16 &v) |
|
|
572 | { |
|
|
573 | unsigned int len = min (v.len, 0xFFFF); |
|
|
574 | return *this << uint16 (len) << data (v.ptr, len); |
|
|
575 | } |
|
|
576 | |
|
|
577 | packet &packet::operator <<(const char *v) |
|
|
578 | { |
|
|
579 | return *this << data (v, strlen (v ? v : 0)); |
|
|
580 | } |
|
|
581 | |
|
|
582 | void |
|
|
583 | packet::vprintf (const char *format, va_list ap) |
|
|
584 | { |
|
|
585 | int size = room (); |
|
|
586 | |
|
|
587 | int len = vsnprintf ((char *)cur, size, format, ap); |
|
|
588 | |
|
|
589 | if (len >= size) |
|
|
590 | return reset (); |
|
|
591 | |
|
|
592 | cur += len; |
|
|
593 | } |
487 | |
594 | |
488 | /****************************************************************************** |
595 | /****************************************************************************** |
489 | * |
596 | * |
490 | * statistics logging functions. |
597 | * statistics logging functions. |
491 | * |
598 | * |
492 | ******************************************************************************/ |
599 | ******************************************************************************/ |
493 | |
600 | |
494 | #ifdef CS_LOGSTATS |
601 | #ifdef CS_LOGSTATS |
|
|
602 | |
495 | /* cst_tot is for the life of the server, cst_last is for the last series of |
603 | /* cst_tot is for the life of the server, cst_last is for the last series of |
496 | * stats |
604 | * stats |
497 | */ |
605 | */ |
498 | CS_Stats cst_tot, cst_lst; |
606 | CS_Stats cst_tot, cst_lst; |
499 | |
607 | |
500 | /** |
608 | /** |
501 | * Writes out the gathered stats. We clear cst_lst. |
609 | * Writes out the gathered stats. We clear cst_lst. |
502 | */ |
610 | */ |
|
|
611 | void |
503 | void write_cs_stats(void) |
612 | write_cs_stats (void) |
504 | { |
613 | { |
505 | time_t now=time(NULL); |
614 | time_t now = time (NULL); |
506 | |
615 | |
507 | /* If no connections recently, don't both to log anything */ |
616 | /* If no connections recently, don't both to log anything */ |
508 | if (cst_lst.ibytes==0 && cst_lst.obytes==0) return; |
617 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
|
|
618 | return; |
509 | |
619 | |
510 | /* CSSTAT is put in so scripts can easily find the line */ |
620 | /* CSSTAT is put in so scripts can easily find the line */ |
511 | LOG(llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
621 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
512 | ctime(&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
622 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
513 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, |
623 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
514 | cst_lst.max_conn, now - cst_lst.time_start); |
|
|
515 | cst_lst.ibytes=0; |
624 | cst_lst.ibytes = 0; |
516 | cst_lst.obytes=0; |
625 | cst_lst.obytes = 0; |
517 | cst_lst.max_conn=socket_info.nconns; |
|
|
518 | cst_lst.time_start=now; |
626 | cst_lst.time_start = now; |
519 | } |
627 | } |
520 | #endif |
628 | #endif |
|
|
629 | |