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annotate C++/Socket.cpp @ 246:9cfa6fbc9c03

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Socket: add operators for SocketAddress
author David Demelier <markand@malikania.fr>
date Mon, 29 Sep 2014 12:57:43 +0200
parents 3c12f0e8bbb9
children 806dbb6011c7
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1 /*
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2 * Socket.cpp -- portable C++ socket wrappers
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3 *
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4 * Copyright (c) 2013, David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <cstring>
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20
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21 #include "Socket.h"
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22 #include "SocketAddress.h"
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23
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24 /* --------------------------------------------------------
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25 * SocketError implementation
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26 * -------------------------------------------------------- */
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27
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28 SocketError::SocketError(const std::string &error)
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29 {
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30 m_error = error;
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31 }
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32
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33 const char *SocketError::what() const noexcept
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34 {
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35 return m_error.c_str();
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36 }
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37
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38 /* --------------------------------------------------------
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39 * Socket implementation
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40 * -------------------------------------------------------- */
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41
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42 void Socket::init()
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43 {
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44 #if defined(_WIN32)
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45 WSADATA wsa;
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46 WSAStartup(MAKEWORD(2, 2), &wsa);
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47 #endif
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48 }
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49
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50 /* --------------------------------------------------------
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51 * System dependent code
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52 * -------------------------------------------------------- */
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53
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54 #if defined(_WIN32)
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55
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56 std::string Socket::syserror()
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57 {
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58 LPSTR str = nullptr;
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59 std::string errmsg = "Unknown error";
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60
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61 FormatMessageA(
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62 FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
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63 NULL,
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64 WSAGetLastError(),
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65 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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66 (LPSTR)&str, 0, NULL);
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67
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68
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69 if (str) {
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70 errmsg = string(str);
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71 LocalFree(str);
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72 }
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73
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74 return errmsg;
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75 }
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76
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77 #else
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78
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79 #include <cerrno>
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80
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81 std::string Socket::syserror()
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82 {
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83 return strerror(errno);
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84 }
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85
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86 #endif
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87
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88 void Socket::finish()
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89 {
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90 #if defined(_WIN32)
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91 WSACleanup();
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92 #endif
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93 }
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94
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95 /* --------------------------------------------------------
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96 * Standard clear implementation
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97 * -------------------------------------------------------- */
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98
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99 class Standard final : public SocketInterface {
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100 public:
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101 void bind(Socket &s, const SocketAddress &address) override;
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102 void close(Socket &s) override;
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103 void connect(Socket &s, const SocketAddress &address) override;
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104 Socket accept(Socket &s, SocketAddress &info) override;
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105 void listen(Socket &s, int max) override;
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106 unsigned recv(Socket &s, void *data, unsigned len) override;
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107 unsigned recvfrom(Socket &s, void *data, unsigned len, SocketAddress &info) override ;
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108 unsigned send(Socket &s, const void *data, unsigned len) override;
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109 unsigned sendto(Socket &s, const void *data, unsigned len, const SocketAddress &info) override;
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110 };
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111
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112 void Standard::bind(Socket &s, const SocketAddress &addr)
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113 {
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114 auto &sa = addr.address();
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115 auto addrlen = addr.length();
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116
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117 if (::bind(s.handle(), (sockaddr *)&sa, addrlen) == SOCKET_ERROR)
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118 throw SocketError(Socket::syserror());
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119 }
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120
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121 void Standard::connect(Socket &s, const SocketAddress &addr)
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122 {
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123 auto &sa = addr.address();
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124 auto addrlen = addr.length();
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125
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126 if (::connect(s.handle(), (sockaddr *)&sa, addrlen) == SOCKET_ERROR)
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127 throw SocketError(Socket::syserror());
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128 }
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129
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130 Socket Standard::accept(Socket &s, SocketAddress &info)
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131 {
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132 Socket c;
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133 Socket::Handle handle;
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134
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135 // Store the information
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136 sockaddr_storage address;
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137 socklen_t addrlen;
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138
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139 addrlen = sizeof (sockaddr_storage);
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140 handle = ::accept(s.handle(), (sockaddr *)&address, &addrlen);
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141
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142 if (handle == INVALID_SOCKET)
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143 throw SocketError(Socket::syserror());
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144
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145 // Usually accept works only with SOCK_STREAM
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146 info = SocketAddress(address, addrlen);
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147
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148 return Socket(handle, address.ss_family, s.type(), s.protocol());
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149 }
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150
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151 void Standard::listen(Socket &s, int max)
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152 {
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153 if (::listen(s.handle(), max) == SOCKET_ERROR)
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154 throw SocketError(Socket::syserror());
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155 }
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156
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157 unsigned Standard::recv(Socket &s, void *data, unsigned dataLen)
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158 {
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159 int nbread;
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160
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161 nbread = ::recv(s.handle(), (Socket::Arg)data, dataLen, 0);
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162 if (nbread == SOCKET_ERROR)
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163 throw SocketError(Socket::syserror());
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164
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165 return (unsigned)nbread;
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166 }
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167
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168 unsigned Standard::send(Socket &s, const void *data, unsigned dataLen)
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169 {
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170 int nbsent;
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171
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172 nbsent = ::send(s.handle(), (Socket::ConstArg)data, dataLen, 0);
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173 if (nbsent == SOCKET_ERROR)
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174 throw SocketError(Socket::syserror());
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175
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176 return (unsigned)nbsent;
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177 }
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178
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179 unsigned Standard::recvfrom(Socket &s, void *data, unsigned dataLen, SocketAddress &info)
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180 {
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181 int nbread;
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182
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183 // Store information
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184 sockaddr_storage address;
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185 socklen_t addrlen;
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186
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187 addrlen = sizeof (struct sockaddr_storage);
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188 nbread = ::recvfrom(s.handle(), (Socket::Arg)data, dataLen, 0, (sockaddr *)&address, &addrlen);
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189
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190 if (nbread == SOCKET_ERROR)
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191 throw SocketError(Socket::syserror());
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192
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193 return (unsigned)nbread;
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194 }
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195
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196 unsigned Standard::sendto(Socket &s, const void *data, unsigned dataLen, const SocketAddress &info)
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197 {
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198 int nbsent;
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199
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200 nbsent = ::sendto(s.handle(), (Socket::ConstArg)data, dataLen, 0, (const sockaddr *)&info.address(), info.length());
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201 if (nbsent == SOCKET_ERROR)
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202 throw SocketError(Socket::syserror());
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203
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204 return (unsigned)nbsent;
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205 }
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206
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207 void Standard::close(Socket &s)
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208 {
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209 (void)closesocket(s.handle());
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210 }
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211
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212 /* --------------------------------------------------------
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213 * Socket code
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214 * -------------------------------------------------------- */
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215
170
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216 Socket::Socket()
175
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217 : m_domain(0)
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218 , m_type(0)
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219 , m_protocol(0)
170
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220 {
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221 }
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222
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223 Socket::Socket(int domain, int type, int protocol)
245
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224 : m_interface(std::make_unique<Standard>())
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225 , m_domain(domain)
175
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226 , m_type(type)
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227 , m_protocol(protocol)
170
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228 {
245
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229 m_handle = socket(domain, type, protocol);
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230
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231 if (m_handle == INVALID_SOCKET)
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232 throw SocketError(syserror());
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233
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234 m_open = true;
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235 }
170
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236
245
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237 Socket::Socket(Handle handle, int domain, int type, int protocol)
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238 : m_handle(handle)
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239 , m_domain(domain)
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240 , m_type(type)
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241 , m_protocol(protocol)
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242 , m_open(true)
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243 {
170
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244 }
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245
245
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246 Socket::Socket(Socket &&other) noexcept
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247 : m_interface(std::move(other.m_interface))
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248 , m_handle(std::move(other.m_handle))
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249 , m_domain(other.m_domain)
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250 , m_type(other.m_type)
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251 , m_protocol(other.m_protocol)
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252 , m_open(true)
170
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253 {
245
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254 // invalidate other
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255 other.m_handle = 0;
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256 other.m_open = false;
170
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257 }
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258
245
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259 Socket &Socket::operator=(Socket &&other) noexcept
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260 {
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261 m_interface = std::move(other.m_interface);
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262 m_handle = std::move(other.m_handle);
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263 m_domain = other.m_domain;
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264 m_type = other.m_type;
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265 m_protocol = other.m_protocol;
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266 m_open = true;
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267
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268 // invalidate other
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269 other.m_handle = 0;
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270 other.m_open = false;
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271
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272 return *this;
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273 }
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274
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275 Socket::~Socket()
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276 {
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277 close();
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278 }
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279
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280 Socket::Handle Socket::handle() const
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281 {
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282 return m_handle;
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283 }
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284
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285 int Socket::domain() const
175
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286 {
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287 return m_domain;
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288 }
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289
245
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290 int Socket::type() const
175
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291 {
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292 return m_type;
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293 }
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294
245
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295 int Socket::protocol() const
175
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296 {
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297 return m_protocol;
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298 }
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299
170
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300 void Socket::set(int level, int name, const void *arg, unsigned argLen)
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301 {
245
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302 if (setsockopt(m_handle, level, name, (Socket::ConstArg)arg, argLen) == SOCKET_ERROR)
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303 throw SocketError(syserror());
170
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304 }
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305
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306 void Socket::blockMode(bool block)
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307 {
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308 #if defined(O_NONBLOCK) && !defined(_WIN32)
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309 int flags;
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310
245
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311 if ((flags = fcntl(m_handle, F_GETFL, 0)) == -1)
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312 flags = 0;
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313
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314 if (!block)
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315 flags &= ~(O_NONBLOCK);
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316 else
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317 flags |= O_NONBLOCK;
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318
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319 if (fcntl(m_handle, F_SETFL, flags) == -1)
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320 throw SocketError(Socket::syserror());
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321 #else
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322 unsigned long flags = (block) ? 0 : 1;
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323
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324 if (ioctlsocket(m_handle, FIONBIO, &flags) == SOCKET_ERROR)
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325 throw SocketError(Socket::syserror());
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326 #endif
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327 }
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328
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329 Socket Socket::accept()
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330 {
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331 SocketAddress dummy;
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332
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333 return m_interface->accept(*this, dummy);
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334 }
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335
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336 unsigned Socket::send(const std::string &message)
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337 {
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338 return Socket::send(message.c_str(), message.length());
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339 }
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340
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341 unsigned Socket::recvfrom(void *data, unsigned dataLen)
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342 {
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343 SocketAddress dummy;
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344
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345 return m_interface->recvfrom(*this, data, dataLen, dummy);
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346 }
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347
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348 unsigned Socket::sendto(const std::string &message, const SocketAddress &info)
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349 {
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350 return sendto(message.c_str(), message.length(), info);
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351 }
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352
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353 bool operator==(const Socket &s1, const Socket &s2)
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354 {
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355 return s1.handle() == s2.handle();
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356 }
174
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357
175
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358 bool operator<(const Socket &s1, const Socket &s2)
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359 {
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360 return s1.handle() < s2.handle();
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361 }