1 | /* Virginia Tech Cognitive Radio Open Source Systems |
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2 | * Virginia Tech, 2009 |
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3 | * |
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4 | * TODO LICENSE INFORMATION GOES HERE |
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5 | */ |
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6 | |
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7 | /* TODO DESCRIPTION OF FILE. |
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8 | */ |
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9 | |
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10 | |
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11 | #include <arpa/inet.h> |
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12 | #include <cstdlib> |
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13 | #include <cstring> |
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14 | #include <netdb.h> |
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15 | #include <netinet/in.h> |
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16 | #include <stdint.h> |
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17 | #include <string> |
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18 | #include <sys/types.h> |
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19 | #include <sys/socket.h> |
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20 | |
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21 | #include "vtcross/common.h" |
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22 | #include "vtcross/containers.h" |
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23 | #include "vtcross/debug.h" |
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24 | #include "vtcross/error.h" |
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25 | #include "vtcross/socketcomm.h" |
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26 | |
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27 | |
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28 | // TODO can someone write a description of how this function is operating? I'm |
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29 | // not sure I understand why it is making two separate blocking calls to recv |
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30 | // |
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31 | // TODO also, it appears that this function can, at maximum, receive 256 bytes |
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32 | // without causing a buffer overflow. can someone confirm/deny? |
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33 | void |
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34 | ReadMessage(int32_t socketFD, char* msgBuffer) |
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35 | { |
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36 | ssize_t msgLength = recv(socketFD, msgBuffer, 256, MSG_PEEK); |
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37 | |
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38 | size_t i; |
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39 | for(i = 0; i < 256; i++) { |
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40 | if(strcmp(&msgBuffer[i], "\0") == 0) |
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41 | break; |
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42 | } |
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43 | |
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44 | msgLength = recv(socketFD, msgBuffer, i + 1, 0); |
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45 | if (msgLength < 0) |
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46 | ERROR(1, "Error reading from socket"); |
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47 | } |
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48 | |
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49 | |
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50 | int32_t |
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51 | ClientSocket(const char* serverName, const char* serverPort) |
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52 | { |
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53 | int32_t socketFD; |
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54 | int32_t portNumber; |
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55 | |
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56 | struct sockaddr_in serv_addr; |
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57 | struct hostent *server; |
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58 | |
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59 | server = gethostbyname(serverName); |
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60 | if(server == NULL) |
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61 | ERROR(1, "No server found by that hostname."); |
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62 | |
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63 | portNumber = atoi(serverPort); |
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64 | |
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65 | socketFD = socket(AF_INET, SOCK_STREAM, 0); |
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66 | if(socketFD < 0) |
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67 | ERROR(1, "Error opening socket"); |
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68 | |
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69 | memset((void *) &serv_addr, 0, sizeof(serv_addr)); |
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70 | serv_addr.sin_family = AF_INET; |
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71 | serv_addr.sin_port = htons(portNumber); |
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72 | memcpy((char *) &serv_addr.sin_addr.s_addr, (char *) server->h_addr, \ |
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73 | server->h_length); |
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74 | |
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75 | if(connect(socketFD, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) |
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76 | ERROR(1, "Error connecting to remote socket."); |
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77 | |
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78 | return socketFD; |
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79 | } |
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80 | |
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81 | |
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82 | /* TODO I'm fairly certain this function is unnecessary, see function below for more details... |
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83 | int32_t |
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84 | SendMessage(int32_t socketFD, char* message) |
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85 | { |
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86 | |
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87 | // TODO explain this. What, exactly, does the below line do and how does it |
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88 | // affect the rest of the function? |
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89 | strcat(message, "\0000"); |
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90 | |
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91 | ssize_t numSentBytes = send(socketFD, message, (strlen(message) + 1), 0); |
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92 | if(numSentBytes < 0) { |
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93 | ERROR(1, "Error sending to server."); |
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94 | } |
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95 | else if(numSentBytes == 0) { |
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96 | LOG("socket_comm::SendMessage - Server closed the socket.\n"); |
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97 | } |
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98 | |
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99 | return numSentBytes; |
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100 | } |
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101 | */ |
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102 | |
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103 | // TODO this function is here to handle calls to send const char* messages. Note |
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104 | // that the std::string.c_str() function auto-appends a null character at the |
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105 | // end of the cstring, so the strcat function call in the previous function |
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106 | // isn't necessary here... I think... although I still don't really understand |
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107 | // what exactly that call is for. |
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108 | int32_t |
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109 | SendMessage(int32_t socketFD, const char* message) |
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110 | { |
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111 | ssize_t numSentBytes = send(socketFD, message, (strlen(message) + 1), 0); |
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112 | if(numSentBytes < 0) { |
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113 | ERROR(1, "Error sending to server."); |
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114 | } |
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115 | else if(numSentBytes == 0) { |
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116 | LOG("socket_comm::SendMessage - Server closed the socket.\n"); |
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117 | } |
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118 | |
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119 | return numSentBytes; |
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120 | } |
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121 | |
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122 | |
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123 | // TODO This function is currently returning 1... always... is this necessary? |
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124 | // If we want a fail/success return type, then why aren't we ever returning a |
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125 | // failure? |
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126 | int32_t |
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127 | GetParameter(int32_t socketFD, struct Parameter pList[], \ |
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128 | struct Radio_Info *radio_info) |
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129 | { |
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130 | char buffer[256]; |
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131 | memset(buffer, 0, 256); |
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132 | |
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133 | ReadMessage(socketFD, buffer); |
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134 | radio_info->numParameters = atoi(buffer); |
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135 | LOG("socket_comm::GetParameter - Number of parameters: %d\n", \ |
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136 | radio_info->numParameters); |
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137 | |
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138 | for(size_t i = 0; i < radio_info->numParameters; i++) { |
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139 | memset(buffer, 0, 256); |
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140 | ReadMessage(socketFD, buffer); |
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141 | LOG("socket_comm::GetParameter - Name: %s\n", buffer); |
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142 | pList[i].name = std::string(buffer); |
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143 | |
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144 | memset(buffer, 0, 256); |
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145 | ReadMessage(socketFD, buffer); |
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146 | LOG("socket_comm::GetParameter - Units: %s\n", buffer); |
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147 | pList[i].units = std::string(buffer); |
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148 | |
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149 | memset(buffer, 0, 256); |
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150 | ReadMessage(socketFD, buffer); |
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151 | LOG("socket_comm::GetParameter - Min: %s\n", buffer); |
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152 | pList[i].min = atof(buffer); |
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153 | |
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154 | memset(buffer, 0, 256); |
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155 | ReadMessage(socketFD, buffer); |
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156 | LOG("socket_comm::GetParameter - Max: %s\n", buffer); |
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157 | pList[i].max = atof(buffer); |
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158 | |
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159 | memset(buffer, 0, 256); |
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160 | ReadMessage(socketFD, buffer); |
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161 | LOG("socket_comm::GetParameter - Step: %s\n", buffer); |
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162 | pList[i].step = atof(buffer); |
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163 | |
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164 | memset(buffer, 0, 256); |
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165 | ReadMessage(socketFD, buffer); |
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166 | LOG("socket_comm::GetParameter - Value: %s\n", buffer); |
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167 | pList[i].value = atof(buffer); |
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168 | } |
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169 | |
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170 | return 1; |
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171 | } |
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172 | |
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173 | |
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174 | // TODO if we are just returing fail/success here, then why not return a bool |
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175 | // instead of an entire 32 bit integer? Seems wasteful. |
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176 | int32_t |
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177 | GetRequest(int32_t socketFD, struct Parameter pList[], struct Radio_Info *radio_info) |
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178 | { |
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179 | char buffer[256]; |
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180 | memset(buffer, 0, 256); |
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181 | |
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182 | ReadMessage(socketFD, buffer); |
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183 | |
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184 | if(strcmp(buffer, "val") != 0) { |
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185 | LOG("socket_comm::GetRequest - Unexpected control data received.\n\n"); |
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186 | return 0; |
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187 | } |
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188 | |
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189 | LOG("socket_comm::GetRequest - Getting parameters.\n\n"); |
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190 | GetParameter(socketFD, pList, radio_info); |
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191 | |
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192 | return 1; |
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193 | } |
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194 | |
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195 | |
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196 | int32_t |
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197 | AcceptTCPConnection(int32_t serverSock) |
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198 | { |
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199 | struct sockaddr_in echoClientAddr; |
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200 | |
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201 | uint32_t clientLength = sizeof(echoClientAddr); |
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202 | |
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203 | int32_t clientSocket = accept(serverSock, NULL, NULL); |
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204 | if(clientSocket < 0) |
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205 | ERROR(1, "Could not establish connection with client socket.\n"); |
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206 | |
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207 | LOG("Handling client %s\n", inet_ntoa(echoClientAddr.sin_addr)); |
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208 | |
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209 | return clientSocket; |
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210 | } |
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211 | |
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212 | |
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213 | int32_t |
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214 | CreateTCPServerSocket(uint16_t port) |
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215 | { |
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216 | struct sockaddr_in echoServerAddr; |
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217 | |
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218 | int32_t localSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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219 | if (localSocket < 0) |
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220 | ERROR(1, "socket() failed\n"); |
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221 | |
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222 | /* Construct the local address structure */ |
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223 | memset(&echoServerAddr, 0, sizeof(echoServerAddr)); |
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224 | echoServerAddr.sin_family = AF_INET; |
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225 | echoServerAddr.sin_addr.s_addr = htonl(INADDR_ANY); |
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226 | echoServerAddr.sin_port = htons(port); |
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227 | |
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228 | /* Bind to the local address */ |
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229 | if(bind(localSocket, (struct sockaddr *) &echoServerAddr, \ |
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230 | sizeof(echoServerAddr)) < 0) |
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231 | ERROR(1, "bind() failed\n"); |
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232 | |
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233 | /* Mark the socket so it will listen for incoming connections */ |
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234 | if(listen(localSocket, 5) < 0) |
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235 | ERROR(1, "listen() failed\n"); |
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236 | |
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237 | return localSocket; |
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238 | } |
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239 | |
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