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annotate sources/network.cpp @ 8:ed800eab1c38 tip

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fixed the brackets :^)
author Vlad Glagolev <enqlave@gmail.com>
date Sun, 20 Apr 2008 13:45:32 +0400
parents 8d54d9fdeca3
children
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1 /** network.cpp (2007-04-02)
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2 *
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3 * -- CABAL -- network essentials (sockets, etc.)
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4 *
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5 * Copyright (c) 2007-2008 Vlad Glagolev <enqlave@gmail.com>
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6 * All rights reserved.
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7 *
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8 * Permission to use, copy, modify, and distribute this software for any
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9 * purpose with or without fee is hereby granted, provided that the above
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10 * copyright notice and this permission notice appear in all copies.
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11 *
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12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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19 */
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20
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21 #include "cabal.hpp" // required: network.hpp
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22
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23 Network::Network()
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24 {
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25 if (CABAL->debug)
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26 cout << "NETWORK: going on-line...\n";
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27 }
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28
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29 Network::~Network()
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30 {
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31 closeSocket();
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32
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33 if (CABAL->debug)
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34 cout << "NETWORK: off-line\n";
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35 }
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36
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37 void Network::sendMsg(string m)
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38 {
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39 if (cs == -1)
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40 return;
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41
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42 if (CABAL->debug)
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43 cout << "<- " << cs << " -- " << m << endl;
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44
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45 send(cs, (m + "\n").c_str(), (m + "\n").length(), 0);
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46 }
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47
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48 string Network::receiveMsg()
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49 {
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50 if (cs == -1)
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51 return 0;
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52
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53 if (canRead(cs)) {
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54 string sbuffer;
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55 char cbuffer;
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56
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57 int err = recv(cs, &cbuffer, 1, 0);
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58
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59 if (err > 0) {
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60 sbuffer += cbuffer;
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61
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62 while (1) {
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63 if (sbuffer[sbuffer.size() - 1] == '\n') {
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64 sbuffer = (sbuffer.substr(0, 1) == ":")
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65 ? sbuffer.substr(1, sbuffer.length() - 3)
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66 : sbuffer.substr(0, sbuffer.length() - 2);
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67
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68 if (CABAL->debug)
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69 cout << "-> " << cs << " -- " << sbuffer << endl;
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70
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71 return sbuffer;
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72 }
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73
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74 err = recv(cs, &cbuffer, 1, 0);
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75
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76 if (!err)
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77 shut("remote server closed connection");
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78 else if (err < 0)
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79 shut("failed to receive data");
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80 else
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81 sbuffer += cbuffer;
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82 }
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83 } else if (!err)
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84 shut("remote server closed connection");
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85
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86 return sbuffer;
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87 }
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88
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89 return "";
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90 }
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91
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92 bool Network::resolveHost(pchar name, struct address_type *a, int inet)
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93 {
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94 #ifdef ENABLE_IPV6
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95 bool e = false;
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96
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97 struct addrinfo hints, *res, *reso;
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98 struct sockaddr_in *in;
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99 struct sockaddr_in6 *in6;
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100
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101 memset(&hints, 0, sizeof (hints));
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102
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103 hints.ai_socktype = SOCK_STREAM;
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104
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105 if (getaddrinfo(name, "domain", &hints, &res) < 0)
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106 return 0;
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107
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108 reso = res;
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109
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110 while (res) {
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111 if (!inet || res->ai_family == inet) {
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112 switch (res->ai_family) {
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113 case AF_INET6:
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114 a->inet = AF_INET6;
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115 in6 = (struct sockaddr_in6 *)res->ai_addr;
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116 memcpy (&a->sa6.sin6_addr, &in6->sin6_addr, \
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117 sizeof (struct in6_addr));
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118 e = true;
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119 break;
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120 case AF_INET:
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121 a->inet = AF_INET;
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122 in = (struct sockaddr_in *)res->ai_addr;
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123 memcpy (&a->sa.sin_addr, &in->sin_addr, \
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124 sizeof (struct in_addr));
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125 e = true;
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126 break;
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127 default:
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128 e = false;
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129 }
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130 }
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131
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132 if (e)
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133 break;
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134
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135 res = res->ai_next;
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136 }
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137
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138 freeaddrinfo(reso);
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139
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140 return e;
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141 #else // ! ENABLE_IPV6
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142 if (inet && inet != AF_INET)
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143 return 0;
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144
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145 a->inet = AF_INET;
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146
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147 struct hostent *he;
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148
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149 if (!(he = gethostbyname(name))) {
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150 a->sa.sin_addr.s_addr = inet_addr(name);
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151
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152 if (a->sa.sin_addr.s_addr)
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153 return 0;
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154 } else
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155 memcpy(&a->sa.sin_addr.s_addr, he->h_addr_list[0], he->h_length);
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156
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157 return 1;
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158 #endif // ENABLE_IPV6
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159 }
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160
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161 bool Network::activateTCP(int port, pchar host)
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162 {
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163 cs = socket(address.inet, SOCK_STREAM, IPPROTO_TCP);
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164
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165 if (cs == -1)
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166 return 0;
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167
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168 if (host) {
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169 struct address_type a;
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170
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171 if (!resolveHost(host, &a, address.inet)) {
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172 close(cs);
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173 return 0;
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174 }
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175
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176 int e;
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177
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178 #ifdef ENABLE_IPV6
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179 if (a.inet == AF_INET6)
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180 e = bind(cs, (struct sockaddr *)&a.sa6, sizeof(a.sa6));
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181 else
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182 #endif // ENABLE_IPV6
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183 e = bind(cs, (struct sockaddr *)&a.sa, sizeof(a.sa));
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184
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185 if (e == -1) {
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186 close(cs);
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187 return 0;
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188 }
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189 }
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190
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191 #ifdef ENABLE_IPV6
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192 if (address.inet == AF_INET6) {
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193 address.sa6.sin6_family = AF_INET6;
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194 address.sa6.sin6_port = htons(port);
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195 }
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196 else {
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197 #endif // ENABLE_IPV6
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198 address.sa.sin_family = AF_INET;
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199 address.sa.sin_port = htons(port);
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200 #ifdef ENABLE_IPV6
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201 }
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202 #endif // ENABLE_IPV6
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203
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204 socklen_t parm;
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205
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206 setsockopt(cs, IPPROTO_TCP, TCP_NODELAY, (pchar)&parm, sizeof(parm));
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207
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208 connected = false;
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209 connecting = true;
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210
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211 if (CABAL->debug)
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212 cout << "NETWORK: socket opened..........: " << cs << endl;
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213
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214 return 1;
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215 }
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216
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217 bool Network::openHost()
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218 {
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219 int e;
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220 #ifdef ENABLE_IPV6
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221 if (address.inet == AF_INET6)
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222 e = connect(cs, (struct sockaddr *)&address.sa6, sizeof(address.sa6));
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223 else
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224 #endif // ENABLE_IPV6
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225 e = connect(cs, (struct sockaddr *)&address.sa, sizeof(address.sa));
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226
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227 if (e == -1) {
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228 if (errno == EISCONN) {
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229 connected = true;
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230 connecting = false;
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231
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232 return 1;
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233 }
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234
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235 if (errno != EWOULDBLOCK && errno != EINPROGRESS && errno != EALREADY) {
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236 closeSocket();
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237
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238 connecting = false;
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239
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240 return 0;
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241 }
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242
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243 return 1;
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244 }
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245
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246 connected = true;
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247 connecting = false;
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248
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249 if (CABAL->debug)
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250 cout << "NETWORK: socket connected.......: " << cs << endl;
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251
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252 return 1;
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253 }
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254
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255 bool Network::closeSocket()
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256 {
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257 if (cs == -1)
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258 return 0;
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259
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260 close(cs);
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261
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262 cs = -1;
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263
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264 return 1;
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265 }
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266
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267 int Network::canRead(int socket)
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268 {
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269 FD_ZERO(&rs);
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270 FD_SET(socket, &rs);
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271
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272 timeout.tv_sec = 0;
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273 timeout.tv_usec = 1;
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274
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275 int e = select(socket + 1, &rs, 0, 0, &timeout);
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276
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277 FD_ZERO(&rs);
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278
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279 return e;
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280 }
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281
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282 int Network::canWrite(int socket)
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283 {
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284 FD_ZERO(&ws);
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285 FD_SET(socket, &ws);
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286
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287 timeout.tv_sec = 0;
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288 timeout.tv_usec = 1;
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289
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290 int e = select(socket + 1, 0, &ws, 0, &timeout);
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291
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292 FD_ZERO(&ws);
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293
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294 return e;
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295 }