1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * ---------------------------------------------------------------------- |
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4 | * Implementation of the Socket class. |
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5 | * |
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6 | * ====================================================================== |
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7 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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8 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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9 | * |
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10 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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11 | * |
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12 | * See the file "license.terms" for information on usage and |
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13 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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14 | * ====================================================================== |
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15 | */ |
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16 | #include <string.h> |
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17 | #include <errno.h> |
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18 | #include <fcntl.h> |
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19 | |
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20 | #include "Socket.h" |
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21 | |
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22 | ssize_t writen(int fd, void *vptr, size_t n) ; |
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23 | ssize_t readn(int fd, void *vptr, size_t n) ; |
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24 | |
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25 | void error(int status, int err, const char *fmt, ... ){ |
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26 | va_list ap; |
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27 | va_start(ap, fmt); |
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28 | //fprintf(stderr, "%s: ", program_name); |
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29 | vfprintf(stderr, fmt, ap); |
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30 | va_end(ap); |
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31 | |
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32 | if(err) |
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33 | fprintf(stderr, ":%s (%d)\n", strerror(err), err); |
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34 | if(status) |
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35 | exit(status); |
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36 | } |
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37 | |
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38 | void |
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39 | set_address(char *hname, char *sname, struct sockaddr_in *sap, char *protocol) |
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40 | { |
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41 | struct servent *sp = NULL; |
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42 | struct hostent *hp; |
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43 | char *endptr; |
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44 | short port; |
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45 | |
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46 | bzero(sap, sizeof(*sap)); |
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47 | sap->sin_family = AF_INET; |
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48 | |
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49 | if (hname!=NULL) { |
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50 | if (!inet_aton(hname, &sap->sin_addr)) { |
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51 | hp = gethostbyname(hname); |
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52 | if(hp==NULL) { |
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53 | error(1, 0, "unknown host: %s\n", hname); |
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54 | } |
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55 | sap->sin_addr = *(struct in_addr *) hp->h_addr; |
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56 | } |
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57 | } else { |
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58 | sap->sin_addr.s_addr = htonl(INADDR_ANY); |
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59 | } |
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60 | port = strtol(sname, &endptr, 0); |
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61 | if (*endptr=='\0') { |
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62 | sap->sin_port = htons(port); |
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63 | } else { |
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64 | sp = getservbyname(sname, protocol); |
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65 | } |
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66 | if (sp == NULL) { |
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67 | error(1, 0, "unknown service: %s\n", sname); |
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68 | } |
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69 | } |
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70 | |
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71 | void parse_GET_string(char *_str, char keys[256][256], char values[256][256], int *count) |
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72 | { |
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73 | char str[1024]; |
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74 | strcpy(str, _str); |
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75 | char * pch_amp; |
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76 | |
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77 | //printf ("Splitting string \"%s\" in tokens:\n",str); |
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78 | pch_amp = strtok (str,"&"); |
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79 | //return; |
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80 | int k=0; |
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81 | while (pch_amp != NULL) |
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82 | { |
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83 | char keyval[128]; |
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84 | strcpy(keyval, pch_amp); |
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85 | |
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86 | char *valptr = strchr(keyval, '='); |
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87 | |
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88 | if (valptr!=NULL) |
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89 | { |
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90 | *valptr='\0'; |
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91 | valptr++; |
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92 | |
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93 | strcpy(keys[k], keyval); |
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94 | strcpy(values[k], valptr); |
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95 | } |
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96 | else |
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97 | { |
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98 | strcpy(keys[k], keyval); |
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99 | strcpy(values[k], ""); |
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100 | } |
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101 | //printf("Key - :%s:, Value - :%s:\n", keys[k], values[k]); |
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102 | pch_amp = strtok (NULL, "&"); |
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103 | k++; |
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104 | } |
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105 | *count = k; |
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106 | } |
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107 | |
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108 | |
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109 | |
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110 | Socket::Socket() : |
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111 | m_sock ( -1 ) |
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112 | { |
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113 | |
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114 | memset ( &m_addr, |
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115 | 0, |
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116 | sizeof ( m_addr ) ); |
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117 | |
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118 | } |
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119 | |
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120 | Socket::~Socket() |
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121 | { |
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122 | if ( is_valid() ) |
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123 | ::close ( m_sock ); |
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124 | } |
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125 | |
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126 | bool Socket::create() |
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127 | { |
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128 | m_sock = socket ( AF_INET, |
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129 | SOCK_STREAM, |
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130 | 0 ); |
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131 | |
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132 | if ( ! is_valid() ) |
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133 | return false; |
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134 | |
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135 | |
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136 | // TIME_WAIT - argh |
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137 | int on = 1; |
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138 | if ( setsockopt ( m_sock, SOL_SOCKET, SO_REUSEADDR, ( const char* ) &on, sizeof ( on ) ) == -1 ) |
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139 | return false; |
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140 | |
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141 | |
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142 | return true; |
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143 | |
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144 | } |
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145 | |
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146 | |
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147 | |
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148 | bool Socket::bind ( const int port ) |
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149 | { |
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150 | |
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151 | if ( ! is_valid() ) |
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152 | { |
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153 | return false; |
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154 | } |
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155 | |
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156 | m_addr.sin_family = AF_INET; |
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157 | m_addr.sin_addr.s_addr = INADDR_ANY; |
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158 | m_addr.sin_port = htons ( port ); |
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159 | |
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160 | int bind_return = ::bind ( m_sock, |
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161 | ( struct sockaddr * ) &m_addr, |
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162 | sizeof ( m_addr ) ); |
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163 | |
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164 | |
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165 | if ( bind_return == -1 ) |
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166 | { |
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167 | return false; |
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168 | } |
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169 | |
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170 | return true; |
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171 | } |
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172 | |
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173 | |
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174 | bool Socket::listen() const |
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175 | { |
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176 | if ( ! is_valid() ) |
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177 | { |
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178 | return false; |
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179 | } |
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180 | |
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181 | //printf("socket:listen:1\n"); |
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182 | //fflush(stdout); |
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183 | int listen_return = ::listen ( m_sock, MAXCONNECTIONS ); |
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184 | //printf("socket:listen:2\n"); |
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185 | //fflush(stdout); |
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186 | |
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187 | |
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188 | if ( listen_return == -1 ) |
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189 | { |
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190 | return false; |
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191 | } |
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192 | |
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193 | return true; |
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194 | } |
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195 | |
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196 | |
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197 | bool Socket::accept ( Socket& new_socket ) const |
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198 | { |
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199 | int addr_length = sizeof ( m_addr ); |
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200 | new_socket.m_sock = ::accept ( m_sock, ( sockaddr * ) &m_addr, ( socklen_t * ) &addr_length ); |
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201 | |
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202 | if ( new_socket.m_sock <= 0 ) |
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203 | return false; |
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204 | else |
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205 | return true; |
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206 | } |
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207 | |
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208 | |
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209 | bool Socket::send ( const std::string s ) const |
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210 | { |
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211 | int status = ::send ( m_sock, s.c_str(), s.size(), MSG_NOSIGNAL ); |
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212 | if ( status == -1 ) |
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213 | { |
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214 | return false; |
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215 | } |
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216 | else |
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217 | { |
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218 | return true; |
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219 | } |
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220 | } |
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221 | |
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222 | |
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223 | bool Socket::send (char* s, int size) const |
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224 | { |
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225 | //int status = ::send ( m_sock, s, size, MSG_NOSIGNAL ); |
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226 | |
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227 | int status = writen(m_sock, s, size); |
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228 | if ( status == -1 ) |
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229 | { |
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230 | return false; |
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231 | } |
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232 | else |
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233 | { |
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234 | return true; |
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235 | } |
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236 | } |
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237 | |
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238 | |
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239 | int Socket::recv ( std::string& s ) const |
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240 | { |
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241 | char buf [ MAXRECV + 1 ]; |
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242 | |
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243 | s = ""; |
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244 | |
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245 | memset ( buf, 0, MAXRECV + 1 ); |
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246 | int status = ::recv ( m_sock, buf, MAXRECV, 0 ); |
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247 | |
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248 | if ( status == -1 ) |
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249 | { |
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250 | std::cout << "status == -1 errno == " << errno << " in Socket::recv\n"; |
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251 | return 0; |
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252 | } |
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253 | else if ( status == 0 ) |
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254 | { |
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255 | return 0; |
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256 | } |
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257 | else |
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258 | { |
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259 | s = buf; |
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260 | return status; |
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261 | } |
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262 | } |
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263 | |
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264 | |
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265 | int Socket::recv (char* s, int size) const |
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266 | { |
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267 | |
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268 | //int status = ::recv ( m_sock, s, size, 0 ); |
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269 | int status = readn( m_sock, s, size); |
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270 | |
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271 | if ( status == -1 ) |
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272 | { |
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273 | std::cout << "status == -1 errno == " << errno << " in Socket::recv\n"; |
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274 | return 0; |
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275 | } |
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276 | else if ( status == 0 ) |
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277 | { |
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278 | return 0; |
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279 | } |
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280 | else |
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281 | { |
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282 | return status; |
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283 | } |
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284 | } |
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285 | |
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286 | |
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287 | bool Socket::connect ( const std::string host, const int port ) |
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288 | { |
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289 | if ( ! is_valid() ) return false; |
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290 | |
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291 | m_addr.sin_family = AF_INET; |
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292 | m_addr.sin_port = htons ( port ); |
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293 | |
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294 | int status = inet_pton ( AF_INET, host.c_str(), &m_addr.sin_addr ); |
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295 | |
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296 | if ( errno == EAFNOSUPPORT ) return false; |
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297 | |
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298 | status = ::connect ( m_sock, ( sockaddr * ) &m_addr, sizeof ( m_addr ) ); |
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299 | |
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300 | if ( status == 0 ) |
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301 | return true; |
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302 | else |
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303 | return false; |
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304 | } |
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305 | |
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306 | void Socket::set_non_blocking ( const bool b ) |
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307 | { |
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308 | |
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309 | int opts; |
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310 | |
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311 | opts = fcntl ( m_sock, |
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312 | F_GETFL ); |
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313 | |
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314 | if ( opts < 0 ) |
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315 | { |
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316 | return; |
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317 | } |
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318 | |
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319 | if ( b ) |
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320 | opts = ( opts | O_NONBLOCK ); |
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321 | else |
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322 | opts = ( opts & ~O_NONBLOCK ); |
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323 | |
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324 | fcntl ( m_sock, |
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325 | F_SETFL,opts ); |
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326 | |
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327 | } |
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328 | |
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329 | ssize_t readn(int fd, void *vptr, size_t n) |
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330 | { |
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331 | size_t nleft; |
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332 | ssize_t nread; |
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333 | char* ptr; |
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334 | |
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335 | ptr = (char*) vptr; |
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336 | nleft = n; |
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337 | |
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338 | while(nleft > 0){ |
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339 | if((nread=read(fd, ptr, nleft))<0){ |
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340 | if(errno==EINTR) |
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341 | nread = 0; |
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342 | else |
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343 | return(-1); |
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344 | } |
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345 | else if(nread==0){ |
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346 | fprintf(stderr, "socket::readn nread==0\n"); |
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347 | break; |
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348 | } |
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349 | |
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350 | nleft -= nread; |
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351 | ptr += nread; |
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352 | } |
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353 | |
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354 | return (n-nleft); //return n>=0 |
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355 | } |
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356 | |
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357 | |
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358 | ssize_t writen(int fd, void *vptr, size_t n) |
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359 | { |
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360 | size_t nleft; |
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361 | ssize_t nwritten; |
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362 | const char* ptr; |
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363 | |
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364 | ptr = (char*) vptr; |
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365 | nleft = n; |
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366 | |
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367 | while(nleft > 0){ |
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368 | if((nwritten=write(fd, ptr, nleft))<=0){ |
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369 | if(errno==EINTR) |
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370 | nwritten = 0; |
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371 | else |
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372 | return(-1); |
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373 | } |
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374 | nleft -= nwritten; |
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375 | ptr += nwritten; |
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376 | } |
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377 | |
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378 | return (n); |
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379 | } |
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