1 | |
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2 | /* |
1 | /* |
3 | * static char *rcsid_sockets_c = |
2 | * This file is part of Crossfire TRT, the Roguelike Realtime MORPG. |
4 | * "$Id: lowlevel.C,v 1.5 2006/09/10 13:43:33 root Exp $"; |
3 | * |
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4 | * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team |
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5 | * Copyright (©) 1992,2007 Frank Tore Johansen |
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6 | * |
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7 | * Crossfire TRT 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 3 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, see <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * The authors can be reached via e-mail to <crossfire@schmorp.de> |
5 | */ |
21 | */ |
6 | |
22 | |
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 | /** |
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30 | * \file |
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31 | * Low-level socket-related functions. |
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32 | * |
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33 | * \date 2003-12-02 |
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34 | * |
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35 | * Contains some base functions that both the client and server |
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36 | * can use. As such, depending what we are being compiled for will |
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37 | * determine what we can include. the client is designed have |
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38 | * CFCLIENT defined as part of its compile flags. |
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39 | */ |
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40 | |
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41 | using namespace std; |
23 | using namespace std; |
42 | |
24 | |
43 | #include <global.h> |
25 | #include <global.h> |
44 | #include <newclient.h> |
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45 | #include <sproto.h> |
26 | #include <sproto.h> |
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27 | #include <cstdarg> |
46 | |
28 | |
47 | #ifdef __linux__ |
29 | #if HAVE_TCP_INFO |
48 | # include <sys/types.h> |
30 | # include <sys/types.h> |
49 | # include <sys/socket.h> |
31 | # include <sys/socket.h> |
50 | # include <netinet/in.h> |
32 | # include <netinet/in.h> |
51 | # define TCP_HZ 1000 // sorry... |
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52 | # include <netinet/tcp.h> |
33 | # include <netinet/tcp.h> |
53 | #endif |
34 | #endif |
54 | |
35 | |
55 | // use a really low timeout, as it doesn't cost any bandwidth, and you can |
36 | // force a packet when idle for more than this many seconds, |
56 | // easily die in 20 seconds... |
37 | // forcing an ack regularly. |
57 | #define SOCKET_TIMEOUT1 10 |
38 | #define IDLE_PING 2. |
58 | #define SOCKET_TIMEOUT2 20 |
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59 | |
39 | |
60 | void |
40 | void |
61 | Socket_Flush (NewSocket * ns) |
41 | client::flush () |
62 | { |
42 | { |
63 | #ifdef __linux__ |
43 | if (destroyed ()) |
64 | // check time of last ack, and, if too old, kill connection |
44 | return; |
65 | struct tcp_info tcpi; |
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66 | socklen_t len = sizeof (tcpi); |
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67 | |
45 | |
68 | if (!getsockopt (ns->fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) |
46 | /** |
69 | { |
47 | * Writes data to socket. |
70 | unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; |
48 | * |
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49 | * When the socket is clear to write, and we have backlogged data, this |
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50 | * is called to write it out. |
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51 | */ |
71 | |
52 | |
72 | if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s |
53 | // write a nop to the socket at least every IDLE_NOP seconds. |
73 | && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s |
54 | if (!outputbuffer.len) |
74 | { |
55 | { |
75 | LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", ns->fd, |
56 | if (last_send + IDLE_PING <= NOW && pl && pl->active) |
76 | (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); |
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77 | ns->status = Ns_Dead; |
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78 | } |
57 | { |
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58 | // this is a bit ugly, but map1/map1a seem to be the only |
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59 | // nop'able commands and they are quite small. |
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60 | packet sl (mapmode == Map1Cmd ? "map1" : "map1a"); |
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61 | send_packet (sl); |
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62 | } |
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63 | else |
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64 | return; |
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65 | } |
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66 | |
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67 | if (socket_ev.poll () & PE_W) |
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68 | return; |
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69 | |
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70 | last_send = NOW; |
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71 | write_outputbuffer (); |
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72 | } |
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73 | |
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74 | void |
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75 | client::write_outputbuffer () |
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76 | { |
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77 | while (outputbuffer.len) |
79 | } |
78 | { |
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79 | int res = write (fd, outputbuffer.data + outputbuffer.start, |
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80 | min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); |
80 | |
81 | |
81 | int val; |
82 | if (res > 0) |
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83 | { |
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84 | outputbuffer.start += res; |
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85 | /* wrap back to start of buffer */ |
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86 | if (outputbuffer.start == SOCKETBUFSIZE) |
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87 | outputbuffer.start = 0; |
82 | |
88 | |
83 | val = 0; |
89 | outputbuffer.len -= res; |
84 | setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
90 | } |
85 | val = 1; |
91 | else if (res == 0) |
86 | setsockopt (ns->fd, IPPROTO_TCP, TCP_CORK, &val, sizeof (val)); |
92 | { |
87 | #endif |
93 | LOG (llevError, "socket write failed, connection closed.\n"); |
88 | } |
94 | destroy (); |
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95 | return; |
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96 | } |
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97 | else if (errno == EINTR) |
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98 | { |
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99 | // just retry |
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100 | } |
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101 | else if (errno == EAGAIN) |
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102 | { |
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103 | // delay till ready |
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104 | socket_ev.poll (socket_ev.poll () | PE_W); |
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105 | socket_ev.start (); |
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106 | return; |
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107 | } |
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108 | else |
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109 | { |
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110 | LOG (llevError, "socket write failed: %s\n", strerror (errno)); |
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111 | destroy (); |
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112 | return; |
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113 | } |
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114 | } |
89 | |
115 | |
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116 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
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117 | } |
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118 | |
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119 | /****************************************************************************** |
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120 | * |
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121 | * Start of read routines. |
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122 | * |
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123 | ******************************************************************************/ |
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124 | |
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125 | int |
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126 | client::next_packet () |
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127 | { |
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128 | if (inbuf_len >= 2) |
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129 | { |
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130 | int pkt_len = (inbuf [0] << 8) | inbuf [1]; |
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131 | |
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132 | if (inbuf_len >= 2 + pkt_len) |
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133 | return 2 + pkt_len; |
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134 | |
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135 | if (inbuf_len == sizeof (inbuf)) |
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136 | { |
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137 | send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED | NDI_REPLY); |
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138 | destroy (); |
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139 | return -1; |
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140 | } |
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141 | } |
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142 | |
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143 | return 0; |
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144 | } |
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145 | |
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146 | void |
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147 | client::skip_packet (int len) |
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148 | { |
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149 | inbuf_len -= len; |
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150 | memmove (inbuf, inbuf + len, inbuf_len); |
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151 | } |
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152 | |
90 | /*********************************************************************** |
153 | /***************************************************************************** |
91 | * |
154 | * Start of command dispatch area. |
92 | * SockList functions/utilities |
155 | * The commands here are protocol commands. |
93 | * |
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94 | **********************************************************************/ |
156 | ****************************************************************************/ |
95 | |
157 | |
96 | void |
158 | // SocketCommand, PlayingCommand, should not exist with those ugly casts |
97 | SockList_Init (SockList * sl) |
159 | #define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb), |
98 | { |
160 | #define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER | |
99 | sl->len = 0; |
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100 | sl->buf = NULL; |
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101 | } |
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102 | |
161 | |
103 | void |
162 | /** |
104 | SockList_AddInt (SockList * sl, uint32 data) |
163 | * Dispatch table for the server. |
105 | { |
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106 | sl->buf[sl->len++] = (data >> 24) & 0xff; |
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107 | sl->buf[sl->len++] = (data >> 16) & 0xff; |
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108 | sl->buf[sl->len++] = (data >> 8) & 0xff; |
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109 | sl->buf[sl->len++] = data & 0xff; |
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110 | } |
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111 | |
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112 | void |
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113 | SockList_AddInt64 (SockList * sl, uint64 data) |
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114 | { |
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115 | sl->buf[sl->len++] = (char) ((data >> 56) & 0xff); |
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116 | sl->buf[sl->len++] = (char) ((data >> 48) & 0xff); |
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117 | sl->buf[sl->len++] = (char) ((data >> 40) & 0xff); |
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118 | sl->buf[sl->len++] = (char) ((data >> 32) & 0xff); |
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119 | |
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120 | sl->buf[sl->len++] = (char) ((data >> 24) & 0xff); |
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121 | sl->buf[sl->len++] = (char) ((data >> 16) & 0xff); |
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122 | sl->buf[sl->len++] = (char) ((data >> 8) & 0xff); |
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123 | sl->buf[sl->len++] = (char) (data & 0xff); |
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124 | } |
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125 | |
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126 | /* Basically does the reverse of SockList_AddInt, but on |
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127 | * strings instead. Same for the GetShort, but for 16 bits. |
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128 | */ |
164 | */ |
129 | int |
165 | static struct packet_type packets[] = { |
130 | GetInt_String (unsigned char *data) |
166 | {"ncom", PC(NewPlayerCmd) PF_PLAYING | PF_COMMAND6 }, |
131 | { |
167 | {"command", PC(PlayerCmd) PF_PLAYING | PF_COMMAND0 }, |
132 | return ((data[0] << 24) + (data[1] << 16) + (data[2] << 8) + data[3]); |
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133 | } |
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134 | |
168 | |
135 | short |
169 | {"examine", PC(ExamineCmd) PF_PLAYING }, |
136 | GetShort_String (unsigned char *data) |
170 | {"ex", PC(ExCmd) PF_PLAYING }, |
137 | { |
171 | {"apply", PC(ApplyCmd) PF_PLAYING }, |
138 | return ((data[0] << 8) + data[1]); |
172 | {"lookat", PC(LookAt) PF_PLAYING }, |
139 | } |
173 | {"lock", PC(LockItem) PF_PLAYING }, |
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174 | {"mark", PC(MarkItem) PF_PLAYING }, |
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175 | {"move", PC(MoveCmd) PF_PLAYING }, |
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176 | {"ext", PC(ExtCmd) 0 }, // CF+ |
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177 | {"mapredraw", PC(MapRedrawCmd) 0 }, |
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178 | {"mapinfo", PC(MapInfoCmd) 0 }, // CF+ |
140 | |
179 | |
141 | /****************************************************************************** |
180 | {"reply", SC(ReplyCmd) 0 }, |
142 | * |
181 | {"exti", SC(ExtiCmd) 0 }, // CF+ |
143 | * Start of read routines. |
182 | {"addme", SC(AddMeCmd) 0 }, |
144 | * |
183 | {"askface", SC(AskFaceCmd) 0 }, |
145 | ******************************************************************************/ |
184 | {"requestinfo", SC(RequestInfo) 0 }, |
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185 | {"setfacemode", SC(SetFaceMode) 0 }, |
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186 | {"setsound", SC(SetSound) 0 }, |
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187 | {"setup", SC(SetUp) 0 }, |
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188 | {"version", SC(VersionCmd) 0 }, |
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189 | {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */ |
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190 | {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */ |
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191 | {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */ |
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192 | }; |
146 | |
193 | |
147 | /** |
194 | bool |
148 | * This reads from fd and puts the data in sl. We return true if we think |
195 | client::may_execute (const packet_type *pkt) const |
149 | * we have a full packet, 0 if we have a partial packet. The only processing |
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150 | * we do is remove the intial size value. len (As passed) is the size of the |
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151 | * buffer allocated in the socklist. We make the assumption the buffer is |
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152 | * at least 2 bytes long. |
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153 | */ |
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154 | |
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155 | int |
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156 | SockList_ReadPacket (int fd, SockList * sl, int len) |
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157 | { |
196 | { |
158 | int stat, toread; |
197 | return (!(pkt->flags & PF_PLAYER) || pl) |
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198 | && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING); |
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199 | } |
159 | |
200 | |
160 | /* Sanity check - shouldn't happen */ |
201 | // HACK: some commands currently should be executed |
161 | if (sl->len < 0) |
202 | // even when the player is frozen. this hack detects |
162 | { |
203 | // those commands. it should be folded into may_execute, |
163 | abort (); |
204 | // but kept seperate to emphasise the hack aspect, i.e. |
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205 | // do it better, then remove. |
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206 | static bool |
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207 | always_immediate (const client *ns, const packet_type *pkt, const char *data, int len) |
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208 | { |
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209 | if (!(pkt->flags & (PF_COMMAND0 | PF_COMMAND6))) |
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210 | return false; |
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211 | |
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212 | if (!ns->pl || !ns->pl->ob || !ns->pl->ob->map) |
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213 | return false; |
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214 | |
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215 | if (pkt->flags & PF_COMMAND6) |
164 | } |
216 | { |
165 | /* We already have a partial packet */ |
217 | data += 6; |
166 | if (sl->len < 2) |
218 | len -= 6; |
167 | { |
219 | } |
168 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: change read() to recv() */ |
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169 | |
220 | |
170 | stat = recv (fd, sl->buf + sl->len, 2 - sl->len, 0); |
221 | if (len > 4 && !strncmp (data, "say " , 4)) |
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222 | return true; |
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223 | if (len > 5 && !strncmp (data, "chat ", 5)) |
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224 | return true; |
171 | |
225 | |
172 | #else |
226 | return false; |
173 | do |
227 | } |
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228 | |
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229 | void |
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230 | client::execute (const packet_type *pkt, char *data, int datalen) |
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231 | { |
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232 | if (may_execute (pkt) || always_immediate (this, pkt, data, datalen)) |
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233 | { |
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234 | //TODO: only one format |
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235 | if (pkt->flags & PF_PLAYER) |
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236 | ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl); |
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237 | else |
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238 | ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this); |
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239 | } |
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240 | else |
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241 | send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED | NDI_REPLY, pkt->name); |
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242 | } |
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243 | |
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244 | bool |
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245 | client::handle_packet () |
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246 | { |
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247 | int pkt_len = next_packet (); |
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248 | |
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249 | if (!pkt_len) |
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250 | return false; |
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251 | else if (pkt_len < 0) |
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252 | { |
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253 | LOG (llevError, "read error on player %s\n", |
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254 | pl && pl->ob ? &pl->ob->name : "[anonymous]"); |
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255 | destroy (); |
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256 | return false; |
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257 | } |
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258 | |
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259 | inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */ |
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260 | |
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261 | /* First, break out beginning word. There are at least |
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262 | * a few commands that do not have any paremeters. If |
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263 | * we get such a command, don't worry about trying |
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264 | * to break it up. |
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265 | */ |
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266 | int datalen; |
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267 | char *data = strchr ((char *)inbuf + 2, ' '); |
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268 | |
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269 | if (data) |
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270 | { |
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271 | *data++ = 0; |
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272 | datalen = pkt_len - (data - (char *)inbuf); |
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273 | } |
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274 | else |
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275 | { |
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276 | data = (char *)inbuf + 2; // better read garbage than segfault |
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277 | datalen = 0; |
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278 | } |
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279 | |
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280 | for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt) |
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281 | if (!strcmp ((char *)inbuf + 2, pkt->name)) |
174 | { |
282 | { |
175 | stat = read (fd, sl->buf + sl->len, 2 - sl->len); |
283 | if (pkt->flags & PF_PLAYER && !always_immediate (this, pkt, data, datalen)) |
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284 | queue_command (pkt, data, datalen); |
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285 | else |
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286 | execute (pkt, data, datalen); |
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287 | |
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288 | goto next_packet; |
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289 | } |
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290 | |
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291 | // If we get here, we didn't find a valid command. |
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292 | send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED | NDI_REPLY, (char *)inbuf + 2); |
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293 | next_packet: |
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294 | skip_packet (pkt_len); |
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295 | |
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296 | // input buffer has space again |
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297 | socket_ev.poll (socket_ev.poll () | PE_R); |
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298 | |
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299 | return true; |
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300 | } |
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301 | |
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302 | // callback called when socket is either readable or writable |
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303 | void |
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304 | client::socket_cb (iow &w, int got) |
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305 | { |
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306 | //TODO remove when we have better socket cleanup logic |
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307 | if (destroyed ()) |
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308 | { |
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309 | socket_ev.poll (0); |
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310 | return; |
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311 | } |
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312 | |
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313 | if (got & PE_W) |
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314 | { |
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315 | write_outputbuffer (); |
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316 | |
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317 | if (!outputbuffer.len) |
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318 | socket_ev.poll (socket_ev.poll () & ~PE_W); |
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319 | } |
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320 | |
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321 | if (got & PE_R) |
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322 | { |
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323 | //TODO: rate-limit tcp connection in better ways, important |
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324 | |
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325 | int amount = sizeof (inbuf) - inbuf_len; |
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326 | |
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327 | if (!amount) |
176 | } |
328 | { |
177 | while ((stat == -1) && (errno == EINTR)); |
329 | // input buffer full |
178 | #endif |
330 | socket_ev.poll (socket_ev.poll () & ~PE_R); |
179 | if (stat < 0) |
331 | return; |
180 | { |
332 | } |
181 | /* In non blocking mode, EAGAIN is set when there is no |
333 | |
182 | * data available. |
334 | amount = read (fd, inbuf + inbuf_len, amount); |
183 | */ |
335 | |
184 | #ifdef WIN32 /* ***WIN32 SockList_ReadPacket: error handling for win32 */ |
336 | if (!amount) |
185 | if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) |
337 | { |
|
|
338 | destroy (); |
|
|
339 | return; |
|
|
340 | } |
|
|
341 | else if (amount < 0) |
|
|
342 | { |
|
|
343 | if (errno != EAGAIN && errno != EINTR) |
186 | { |
344 | { |
187 | if (WSAGetLastError () == WSAECONNRESET) |
345 | LOG (llevError, "read error: %s\n", strerror (errno)); |
188 | LOG (llevDebug, "Connection closed by client\n"); |
346 | destroy (); |
189 | else |
347 | return; |
190 | { |
|
|
191 | LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ()); |
|
|
192 | } |
|
|
193 | return -1; /* kick this user! */ |
|
|
194 | } |
348 | } |
195 | #else |
349 | |
196 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
350 | // should not be here, normally |
|
|
351 | } |
|
|
352 | else |
|
|
353 | { |
|
|
354 | inbuf_len += amount; |
|
|
355 | |
|
|
356 | if (handle_packet ()) |
197 | { |
357 | { |
198 | LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
358 | while (handle_packet ()) |
|
|
359 | ; |
|
|
360 | |
|
|
361 | flush (); |
199 | } |
362 | } |
200 | #endif |
|
|
201 | return 0; /*Error */ |
|
|
202 | } |
|
|
203 | if (stat == 0) |
|
|
204 | return -1; |
|
|
205 | sl->len += stat; |
|
|
206 | #ifdef CS_LOGSTATS |
|
|
207 | cst_tot.ibytes += stat; |
|
|
208 | cst_lst.ibytes += stat; |
|
|
209 | #endif |
|
|
210 | if (stat < 2) |
|
|
211 | return 0; /* Still don't have a full packet */ |
|
|
212 | } |
|
|
213 | /* Figure out how much more data we need to read. Add 2 from the |
|
|
214 | * end of this - size header information is not included. |
|
|
215 | */ |
|
|
216 | toread = 2 + (sl->buf[0] << 8) + sl->buf[1] - sl->len; |
|
|
217 | if ((toread + sl->len) >= len) |
|
|
218 | { |
|
|
219 | LOG (llevError, "SockList_ReadPacket: Want to read more bytes than will fit in buffer (%d>=%d).\n", toread + sl->len, len); |
|
|
220 | /* Quick hack in case for 'oldsocketmode' input. If we are |
|
|
221 | * closing the socket anyways, then reading this extra 100 bytes |
|
|
222 | * shouldn't hurt. |
|
|
223 | */ |
|
|
224 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
|
|
225 | recv (fd, sl->buf + 2, 100, 0); |
|
|
226 | #else |
|
|
227 | read (fd, sl->buf + 2, 100); |
|
|
228 | #endif /* end win32 */ |
|
|
229 | |
|
|
230 | /* return error so the socket is closed */ |
|
|
231 | return -1; |
|
|
232 | } |
|
|
233 | do |
|
|
234 | { |
|
|
235 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change read() to recv() */ |
|
|
236 | stat = recv (fd, sl->buf + sl->len, toread, 0); |
|
|
237 | #else |
|
|
238 | do |
|
|
239 | { |
363 | } |
240 | stat = read (fd, sl->buf + sl->len, toread); |
|
|
241 | } |
|
|
242 | while ((stat < 0) && (errno == EINTR)); |
|
|
243 | #endif |
|
|
244 | if (stat < 0) |
|
|
245 | { |
|
|
246 | |
|
|
247 | #ifdef WIN32 /* ***win32 SockList_ReadPacket: change error handling for win32 */ |
|
|
248 | if ((stat == -1) && WSAGetLastError () != WSAEWOULDBLOCK) |
|
|
249 | { |
|
|
250 | if (WSAGetLastError () == WSAECONNRESET) |
|
|
251 | LOG (llevDebug, "Connection closed by client\n"); |
|
|
252 | else |
|
|
253 | { |
|
|
254 | LOG (llevDebug, "ReadPacket got error %d, returning 0\n", WSAGetLastError ()); |
|
|
255 | } |
|
|
256 | return -1; /* kick this user! */ |
|
|
257 | } |
|
|
258 | #else |
|
|
259 | if (errno != EAGAIN && errno != EWOULDBLOCK) |
|
|
260 | { |
|
|
261 | LOG (llevDebug, "ReadPacket got error %s, returning 0\n", strerror (errno)); |
|
|
262 | } |
|
|
263 | #endif |
|
|
264 | return 0; /*Error */ |
|
|
265 | } |
|
|
266 | if (stat == 0) |
|
|
267 | return -1; |
|
|
268 | sl->len += stat; |
|
|
269 | #ifdef CS_LOGSTATS |
|
|
270 | cst_tot.ibytes += stat; |
|
|
271 | cst_lst.ibytes += stat; |
|
|
272 | #endif |
|
|
273 | toread -= stat; |
|
|
274 | if (toread == 0) |
|
|
275 | return 1; |
|
|
276 | if (toread < 0) |
|
|
277 | { |
|
|
278 | LOG (llevError, "SockList_ReadPacket: Read more bytes than desired.\n"); |
|
|
279 | return 1; |
|
|
280 | } |
|
|
281 | } |
364 | } |
282 | while (toread > 0); |
|
|
283 | return 0; |
|
|
284 | } |
365 | } |
285 | |
366 | |
286 | /******************************************************************************* |
367 | /******************************************************************************* |
287 | * |
368 | * |
288 | * Start of write related routines. |
369 | * Start of write related routines. |
… | |
… | |
293 | * Adds data to a socket buffer for whatever reason. |
374 | * Adds data to a socket buffer for whatever reason. |
294 | * |
375 | * |
295 | * ns is the socket we are adding the data to, buf is the start of the |
376 | * ns is the socket we are adding the data to, buf is the start of the |
296 | * data, and len is the number of bytes to add. |
377 | * data, and len is the number of bytes to add. |
297 | */ |
378 | */ |
298 | |
379 | void |
299 | static void |
380 | client::send (void *buf_, int len) |
300 | add_to_buffer (NewSocket * ns, char *buf, int len) |
|
|
301 | { |
381 | { |
|
|
382 | char *buf = (char *)buf_; |
|
|
383 | |
|
|
384 | if (destroyed () || !buf) |
|
|
385 | return; |
|
|
386 | |
|
|
387 | if (len + outputbuffer.len > SOCKETBUFSIZE) |
|
|
388 | { |
|
|
389 | LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd); |
|
|
390 | // shutdown the socket, this is safer than destroying it immediately |
|
|
391 | // as lots of code in the callchain might still access the map etc. |
|
|
392 | shutdown (fd, SHUT_RDWR); |
|
|
393 | return; |
|
|
394 | } |
|
|
395 | |
302 | int avail, end; |
396 | int avail, end; |
303 | |
|
|
304 | if ((len + ns->outputbuffer.len) > SOCKETBUFSIZE) |
|
|
305 | { |
|
|
306 | LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", ns->fd); |
|
|
307 | ns->status = Ns_Dead; |
|
|
308 | return; |
|
|
309 | } |
|
|
310 | |
397 | |
311 | /* data + end is where we start putting the new data. The last byte |
398 | /* data + end is where we start putting the new data. The last byte |
312 | * currently in use is actually data + end -1 |
399 | * currently in use is actually data + end -1 |
313 | */ |
400 | */ |
314 | |
|
|
315 | end = ns->outputbuffer.start + ns->outputbuffer.len; |
401 | end = outputbuffer.start + outputbuffer.len; |
316 | /* The buffer is already in a wrapped state, so adjust end */ |
402 | /* The buffer is already in a wrapped state, so adjust end */ |
317 | if (end >= SOCKETBUFSIZE) |
403 | if (end >= SOCKETBUFSIZE) |
318 | end -= SOCKETBUFSIZE; |
404 | end -= SOCKETBUFSIZE; |
|
|
405 | |
319 | avail = SOCKETBUFSIZE - end; |
406 | avail = SOCKETBUFSIZE - end; |
320 | |
407 | |
321 | /* We can all fit it behind the current data without wrapping */ |
408 | /* We can all fit it behind the current data without wrapping */ |
322 | if (avail >= len) |
409 | if (avail >= len) |
323 | { |
|
|
324 | memcpy (ns->outputbuffer.data + end, buf, len); |
410 | memcpy (outputbuffer.data + end, buf, len); |
325 | } |
|
|
326 | else |
411 | else |
327 | { |
412 | { |
328 | memcpy (ns->outputbuffer.data + end, buf, avail); |
413 | memcpy (outputbuffer.data + end, buf, avail); |
329 | memcpy (ns->outputbuffer.data, buf + avail, len - avail); |
414 | memcpy (outputbuffer.data, buf + avail, len - avail); |
330 | } |
415 | } |
|
|
416 | |
331 | ns->outputbuffer.len += len; |
417 | outputbuffer.len += len; |
332 | #if 0 |
|
|
333 | LOG (llevDebug, "Added %d to output buffer, total length now %d, start=%d\n", len, ns->outputbuffer.len, ns->outputbuffer.start); |
|
|
334 | #endif |
|
|
335 | } |
418 | } |
336 | |
|
|
337 | /** |
|
|
338 | * Writes data to socket. |
|
|
339 | * |
|
|
340 | * When the socket is clear to write, and we have backlogged data, this |
|
|
341 | * is called to write it out. |
|
|
342 | */ |
|
|
343 | void |
|
|
344 | write_socket_buffer (NewSocket * ns) |
|
|
345 | { |
|
|
346 | int amt, max; |
|
|
347 | |
|
|
348 | if (ns->outputbuffer.len == 0) |
|
|
349 | { |
|
|
350 | LOG (llevDebug, "write_socket_buffer called when there is no data, fd=%d\n", ns->fd); |
|
|
351 | return; |
|
|
352 | } |
|
|
353 | |
|
|
354 | do |
|
|
355 | { |
|
|
356 | max = SOCKETBUFSIZE - ns->outputbuffer.start; |
|
|
357 | if (ns->outputbuffer.len < max) |
|
|
358 | max = ns->outputbuffer.len; |
|
|
359 | |
|
|
360 | #ifdef WIN32 /* ***win32 write_socket_buffer: change write() to send() */ |
|
|
361 | amt = send (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max, 0); |
|
|
362 | #else |
|
|
363 | do |
|
|
364 | { |
|
|
365 | amt = write (ns->fd, ns->outputbuffer.data + ns->outputbuffer.start, max); |
|
|
366 | } |
|
|
367 | while ((amt < 0) && (errno == EINTR)); |
|
|
368 | #endif |
|
|
369 | |
|
|
370 | if (amt < 0) |
|
|
371 | { /* We got an error */ |
|
|
372 | |
|
|
373 | #ifdef WIN32 /* ***win32 write_socket_buffer: change error handling */ |
|
|
374 | if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK) |
|
|
375 | { |
|
|
376 | LOG (llevError, "New socket write failed (wsb) (%d).\n", WSAGetLastError ()); |
|
|
377 | #else |
|
|
378 | if (errno != EWOULDBLOCK) |
|
|
379 | { |
|
|
380 | LOG (llevError, "New socket write failed (wsb) (%d: %s).\n", errno, strerror (errno)); |
|
|
381 | #endif |
|
|
382 | ns->status = Ns_Dead; |
|
|
383 | return; |
|
|
384 | } |
|
|
385 | else |
|
|
386 | { /* EWOULDBLOCK */ |
|
|
387 | /* can't write it, so store it away. */ |
|
|
388 | ns->can_write = 0; |
|
|
389 | return; |
|
|
390 | } |
|
|
391 | } |
|
|
392 | ns->outputbuffer.start += amt; |
|
|
393 | /* wrap back to start of buffer */ |
|
|
394 | if (ns->outputbuffer.start == SOCKETBUFSIZE) |
|
|
395 | ns->outputbuffer.start = 0; |
|
|
396 | ns->outputbuffer.len -= amt; |
|
|
397 | #ifdef CS_LOGSTATS |
|
|
398 | cst_tot.obytes += amt; |
|
|
399 | cst_lst.obytes += amt; |
|
|
400 | #endif |
|
|
401 | } |
|
|
402 | while (ns->outputbuffer.len > 0); |
|
|
403 | } |
|
|
404 | |
|
|
405 | /** |
|
|
406 | * This writes data to the socket. - It is very low level - |
|
|
407 | * all we try and do is write out the data to the socket |
|
|
408 | * provided (ns). buf is the data to write, len is the number |
|
|
409 | * of bytes to write. IT doesn't return anything - rather, it |
|
|
410 | * updates the ns structure if we get an error. |
|
|
411 | */ |
|
|
412 | void |
|
|
413 | Write_To_Socket (NewSocket * ns, char *buf, int len) |
|
|
414 | { |
|
|
415 | int amt = 0; |
|
|
416 | char *pos = buf; |
|
|
417 | |
|
|
418 | if (ns->status == Ns_Dead || !buf) |
|
|
419 | { |
|
|
420 | LOG (llevDebug, "Write_To_Socket called with dead socket\n"); |
|
|
421 | return; |
|
|
422 | } |
|
|
423 | |
|
|
424 | #ifndef __GNU__ /* This caused problems on Hurd */ |
|
|
425 | if (!ns->can_write) |
|
|
426 | { |
|
|
427 | add_to_buffer (ns, buf, len); |
|
|
428 | return; |
|
|
429 | } |
|
|
430 | #endif |
|
|
431 | /* If we manage to write more than we wanted, take it as a bonus */ |
|
|
432 | while (len > 0) |
|
|
433 | { |
|
|
434 | |
|
|
435 | #ifdef WIN32 /* ***win32 Write_To_Socket: change write() to send() */ |
|
|
436 | amt = send (ns->fd, pos, len, 0); |
|
|
437 | #else |
|
|
438 | do |
|
|
439 | { |
|
|
440 | amt = write (ns->fd, pos, len); |
|
|
441 | } |
|
|
442 | while ((amt < 0) && (errno == EINTR)); |
|
|
443 | #endif |
|
|
444 | |
|
|
445 | if (amt < 0) |
|
|
446 | { /* We got an error */ |
|
|
447 | #ifdef WIN32 /* ***win32 Write_To_Socket: change error handling */ |
|
|
448 | if (amt == -1 && WSAGetLastError () != WSAEWOULDBLOCK) |
|
|
449 | { |
|
|
450 | LOG (llevError, "New socket write failed WTS (%d).\n", WSAGetLastError ()); |
|
|
451 | #else |
|
|
452 | if (errno != EWOULDBLOCK) |
|
|
453 | { |
|
|
454 | LOG (llevError, "New socket write failed WTS (%d: %s).\n", /* ---WIN32 */ |
|
|
455 | errno, strerror (errno)); |
|
|
456 | #endif |
|
|
457 | ns->status = Ns_Dead; |
|
|
458 | return; |
|
|
459 | } |
|
|
460 | else |
|
|
461 | { /* EWOULDBLOCK */ |
|
|
462 | /* can't write it, so store it away. */ |
|
|
463 | add_to_buffer (ns, pos, len); |
|
|
464 | ns->can_write = 0; |
|
|
465 | return; |
|
|
466 | } |
|
|
467 | } |
|
|
468 | /* amt gets set to 0 above in blocking code, so we do this as |
|
|
469 | * an else if to make sure we don't reprocess it. |
|
|
470 | */ |
|
|
471 | else if (amt == 0) |
|
|
472 | { |
|
|
473 | LOG (llevError, "Write_To_Socket: No data written out.\n"); |
|
|
474 | } |
|
|
475 | len -= amt; |
|
|
476 | pos += amt; |
|
|
477 | #ifdef CS_LOGSTATS |
|
|
478 | cst_tot.obytes += amt; |
|
|
479 | cst_lst.obytes += amt; |
|
|
480 | #endif |
|
|
481 | } |
|
|
482 | } |
|
|
483 | |
|
|
484 | |
419 | |
485 | /** |
420 | /** |
486 | * Takes a string of data, and writes it out to the socket. A very handy |
421 | * Takes a string of data, and writes it out to the socket. A very handy |
487 | * shortcut function. |
422 | * shortcut function. |
488 | */ |
423 | */ |
489 | void |
424 | void |
490 | cs_write_string (NewSocket * ns, const char *buf, int len) |
425 | client::send_packet (packet &sl) |
491 | { |
426 | { |
492 | SockList sl; |
427 | if (destroyed ()) |
493 | |
|
|
494 | sl.len = len; |
|
|
495 | sl.buf = (unsigned char *) buf; |
|
|
496 | Send_With_Handling (ns, &sl); |
|
|
497 | } |
|
|
498 | |
|
|
499 | |
|
|
500 | /** |
|
|
501 | * Calls Write_To_Socket to send data to the client. |
|
|
502 | * |
|
|
503 | * The only difference in this function is that we take a SockList |
|
|
504 | *, and we prepend the length information. |
|
|
505 | */ |
|
|
506 | void |
|
|
507 | Send_With_Handling (NewSocket * ns, SockList * msg) |
|
|
508 | { |
|
|
509 | unsigned char sbuf[4]; |
|
|
510 | |
|
|
511 | if (ns->status == Ns_Dead || !msg) |
|
|
512 | return; |
428 | return; |
513 | |
429 | |
514 | if (msg->len >= MAXSOCKBUF) |
430 | if (sl.length () > MAXSOCKBUF) |
515 | { |
431 | { |
516 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", msg->len); |
432 | LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); |
517 | /* Almost certainly we've overflowed a buffer, so quite now to make |
433 | /* Almost certainly we've overflowed a buffer, so quit now to make |
518 | * it easier to debug. |
434 | * it easier to debug. |
519 | */ |
435 | */ |
520 | abort (); |
436 | abort (); |
521 | } |
437 | } |
522 | sbuf[0] = ((uint32) (msg->len) >> 8) & 0xFF; |
|
|
523 | sbuf[1] = ((uint32) (msg->len)) & 0xFF; |
|
|
524 | if (ns->status != Ns_Old) |
|
|
525 | Write_To_Socket (ns, (char *) sbuf, 2); |
|
|
526 | Write_To_Socket (ns, (char *) msg->buf, msg->len); |
|
|
527 | } |
|
|
528 | |
438 | |
529 | /** |
439 | if (!sl.length ()) |
530 | * Takes a string of data, and writes it out to the socket. A very handy |
|
|
531 | * shortcut function. |
|
|
532 | */ |
|
|
533 | void |
|
|
534 | Write_String_To_Socket (NewSocket * ns, char *buf, int len) |
|
|
535 | { |
|
|
536 | SockList sl; |
|
|
537 | |
|
|
538 | sl.len = len; |
|
|
539 | sl.buf = (unsigned char *) buf; |
|
|
540 | Send_With_Handling (ns, &sl); |
|
|
541 | } |
|
|
542 | |
|
|
543 | |
|
|
544 | /****************************************************************************** |
|
|
545 | * |
|
|
546 | * statistics logging functions. |
|
|
547 | * |
|
|
548 | ******************************************************************************/ |
|
|
549 | |
|
|
550 | #ifdef CS_LOGSTATS |
|
|
551 | |
|
|
552 | /* cst_tot is for the life of the server, cst_last is for the last series of |
|
|
553 | * stats |
|
|
554 | */ |
|
|
555 | CS_Stats cst_tot, cst_lst; |
|
|
556 | |
|
|
557 | /** |
|
|
558 | * Writes out the gathered stats. We clear cst_lst. |
|
|
559 | */ |
|
|
560 | void |
|
|
561 | write_cs_stats (void) |
|
|
562 | { |
|
|
563 | time_t now = time (NULL); |
|
|
564 | |
|
|
565 | /* If no connections recently, don't both to log anything */ |
|
|
566 | if (cst_lst.ibytes == 0 && cst_lst.obytes == 0) |
|
|
567 | return; |
440 | return; |
568 | |
441 | |
569 | /* CSSTAT is put in so scripts can easily find the line */ |
442 | assert (sl.hdrlen == 2); |
570 | LOG (llevInfo, "CSSTAT: %.16s tot %d %d %d %d inc %d %d %d %d\n", |
443 | |
571 | ctime (&now), cst_tot.ibytes, cst_tot.obytes, cst_tot.max_conn, |
444 | sl.buf_ [0] = sl.length () >> 8; |
572 | now - cst_tot.time_start, cst_lst.ibytes, cst_lst.obytes, cst_lst.max_conn, now - cst_lst.time_start); |
445 | sl.buf_ [1] = sl.length () ; |
573 | cst_lst.ibytes = 0; |
446 | |
574 | cst_lst.obytes = 0; |
447 | send (sl.buf_, sl.length () + sl.hdrlen); |
575 | cst_lst.max_conn = socket_info.nconns; |
|
|
576 | cst_lst.time_start = now; |
|
|
577 | } |
448 | } |
578 | #endif |
449 | |
|
|
450 | void |
|
|
451 | client::send_packet (const char *buf, int len) |
|
|
452 | { |
|
|
453 | packet sl; |
|
|
454 | |
|
|
455 | sl << data (buf, len); |
|
|
456 | send_packet (sl); |
|
|
457 | } |
|
|
458 | |
|
|
459 | void |
|
|
460 | client::send_packet (const char *buf) |
|
|
461 | { |
|
|
462 | send_packet (buf, strlen (buf)); |
|
|
463 | } |
|
|
464 | |
|
|
465 | void |
|
|
466 | client::send_packet_printf (const char *format, ...) |
|
|
467 | { |
|
|
468 | packet sl; |
|
|
469 | |
|
|
470 | va_list ap; |
|
|
471 | va_start (ap, format); |
|
|
472 | sl.vprintf (format, ap); |
|
|
473 | va_end (ap); |
|
|
474 | |
|
|
475 | send_packet (sl); |
|
|
476 | } |
|
|
477 | |
|
|
478 | // returns true when the message needs special (read: perl) treatment |
|
|
479 | static bool |
|
|
480 | msg_is_special (const char *msg) |
|
|
481 | { |
|
|
482 | return msg [strcspn (msg, "<[&\n")]; |
|
|
483 | } |
|
|
484 | |
|
|
485 | void |
|
|
486 | client::send_msg (int color, const char *type, const char *msg) |
|
|
487 | { |
|
|
488 | if (!msg || !type) // it can happen (for example, missing attack messages cause this) |
|
|
489 | { |
|
|
490 | LOG (logBacktrace | llevError, "send_msg(%d,%p,%p) called with NULL msg or type.\n", color, type, msg); |
|
|
491 | return; |
|
|
492 | } |
|
|
493 | |
|
|
494 | int len = strlen (msg); |
|
|
495 | |
|
|
496 | if (msg_is_special (msg) || (type [0] == 'c' && type [1] == '/') || len > (MAXSOCKBUF - 128)) |
|
|
497 | cfperl_send_msg (this, color, type, msg); |
|
|
498 | else if (can_msg) |
|
|
499 | send_packet_printf ("msg %d %s %s", color & NDI_CLIENT_MASK, type, msg); |
|
|
500 | else if (color < 0) |
|
|
501 | return; // client cannot handle this |
|
|
502 | else |
|
|
503 | send_packet_printf ("drawinfo %d %s", color & NDI_COLOR_MASK, msg); |
|
|
504 | } |
|
|
505 | |
|
|
506 | void |
|
|
507 | client::send_drawinfo (const char *msg, int flags) |
|
|
508 | { |
|
|
509 | send_msg (flags, "log", msg); |
|
|
510 | } |
|
|
511 | |
|
|
512 | /*********************************************************************** |
|
|
513 | * |
|
|
514 | * packet functions/utilities |
|
|
515 | * |
|
|
516 | **********************************************************************/ |
|
|
517 | |
|
|
518 | packet::packet (const char *name) |
|
|
519 | { |
|
|
520 | reset (); |
|
|
521 | |
|
|
522 | int len = strlen (name); |
|
|
523 | memcpy (cur, name, len); cur += len; |
|
|
524 | *cur++ = ' '; |
|
|
525 | } |
|
|
526 | |
|
|
527 | packet &packet::operator <<(const ber32 v) |
|
|
528 | { |
|
|
529 | enum { maxlen = 32 / 7 + 1}; |
|
|
530 | uint8 buf[maxlen]; |
|
|
531 | uint8 *p = buf + maxlen; |
|
|
532 | uint32 val = v.val; |
|
|
533 | |
|
|
534 | *--p = val & 0x7F; |
|
|
535 | |
|
|
536 | while (val > 0x7F) |
|
|
537 | { |
|
|
538 | val >>= 7; |
|
|
539 | *--p = (val & 0x7F) | 0x80; |
|
|
540 | } |
|
|
541 | |
|
|
542 | return *this << data (p, buf + maxlen - p); |
|
|
543 | } |
|
|
544 | |
|
|
545 | packet &packet::operator <<(const data &v) |
|
|
546 | { |
|
|
547 | if (room () < v.len) |
|
|
548 | reset (); |
|
|
549 | else |
|
|
550 | { |
|
|
551 | if (v.len) |
|
|
552 | { |
|
|
553 | memcpy (cur, v.ptr, v.len); |
|
|
554 | cur += v.len; |
|
|
555 | } |
|
|
556 | } |
|
|
557 | |
|
|
558 | return *this; |
|
|
559 | } |
|
|
560 | |
|
|
561 | packet &packet::operator <<(const data8 &v) |
|
|
562 | { |
|
|
563 | unsigned int len = min (v.len, 0x00FF); |
|
|
564 | return *this << uint8 (len) << data (v.ptr, len); |
|
|
565 | } |
|
|
566 | |
|
|
567 | packet &packet::operator <<(const data16 &v) |
|
|
568 | { |
|
|
569 | unsigned int len = min (v.len, 0xFFFF); |
|
|
570 | return *this << uint16 (len) << data (v.ptr, len); |
|
|
571 | } |
|
|
572 | |
|
|
573 | packet &packet::operator <<(const char *v) |
|
|
574 | { |
|
|
575 | return *this << data (v, strlen (v ? v : 0)); |
|
|
576 | } |
|
|
577 | |
|
|
578 | void |
|
|
579 | packet::vprintf (const char *format, va_list ap) |
|
|
580 | { |
|
|
581 | int size = room (); |
|
|
582 | |
|
|
583 | int len = vsnprintf ((char *)cur, size, format, ap); |
|
|
584 | |
|
|
585 | if (len >= size) |
|
|
586 | return reset (); |
|
|
587 | |
|
|
588 | cur += len; |
|
|
589 | } |
|
|
590 | |