[161] | 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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[166] | 10 | |
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[179] | 11 | #include <arpa/inet.h> |
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[161] | 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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[174] | 17 | #include <string> |
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[161] | 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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[164] | 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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[161] | 30 | void |
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| 31 | ReadMessage(int32_t socketFD, char* msgBuffer) |
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| 32 | { |
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| 33 | ssize_t msgLength = recv(socketFD, msgBuffer, 256, MSG_PEEK); |
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| 34 | |
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| 35 | size_t i; |
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| 36 | for(i = 0; i < 256; i++) { |
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| 37 | if(strcmp(&msgBuffer[i], "\0") == 0) |
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| 38 | break; |
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| 39 | } |
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| 40 | |
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| 41 | msgLength = recv(socketFD, msgBuffer, i + 1, 0); |
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| 42 | if (msgLength < 0) |
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| 43 | ERROR(1, "Error reading from socket"); |
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| 44 | } |
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| 45 | |
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| 46 | |
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| 47 | int32_t |
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[180] | 48 | ClientSocket(const char* serverName, const char* portNumber) |
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[161] | 49 | { |
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| 50 | int32_t socketFD; |
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| 51 | int32_t portNo; |
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| 52 | |
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| 53 | struct sockaddr_in serv_addr; |
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| 54 | struct hostent *server; |
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| 55 | |
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| 56 | server = gethostbyname(serverName); |
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| 57 | if(server == NULL) |
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| 58 | ERROR(1, "No server found by that hostname."); |
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| 59 | |
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| 60 | portNo = atoi(portNumber); |
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| 61 | |
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| 62 | socketFD = socket(AF_INET, SOCK_STREAM, 0); |
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| 63 | if(socketFD < 0) |
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| 64 | ERROR(1, "Error opening socket"); |
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| 65 | |
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| 66 | memset((void *) &serv_addr, 0, sizeof(serv_addr)); |
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| 67 | serv_addr.sin_family = AF_INET; |
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| 68 | serv_addr.sin_port = htons(portNo); |
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| 69 | memcpy((char *) &serv_addr.sin_addr.s_addr, (char *) server->h_addr, \ |
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| 70 | server->h_length); |
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| 71 | |
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| 72 | if(connect(socketFD, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) |
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| 73 | ERROR(1, "Error connecting to remote socket."); |
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| 74 | |
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| 75 | return socketFD; |
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| 76 | } |
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| 77 | |
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[184] | 78 | |
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| 79 | /* TODO see notes in socketcomm.h. This function, and the RemoteComponent |
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[186] | 80 | * struct, need a code review to make sure it is ready to be used rather |
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| 81 | * than ClientSocket() |
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[184] | 82 | */ |
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| 83 | void |
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| 84 | CreateClientSocket(struct RemoteComponent* serverInfo) |
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| 85 | { |
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| 86 | if(serverInfo == NULL) |
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| 87 | ERROR(1, "CreateClientSocket received null struct pointer.\n"); |
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| 88 | |
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| 89 | struct hostent *server = gethostbyname(serverInfo->serverName.c_str()); |
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| 90 | if(server == NULL) |
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| 91 | ERROR(1, "No server found by that hostname."); |
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| 92 | |
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| 93 | serverInfo->socketFD = socket(AF_INET, SOCK_STREAM, 0); |
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| 94 | if(serverInfo->socketFD < 0) |
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| 95 | ERROR(1, "Error opening socket"); |
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| 96 | |
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| 97 | struct sockaddr_in serv_addr; |
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| 98 | memset((void *) &serv_addr, 0, sizeof(serv_addr)); |
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| 99 | serv_addr.sin_family = AF_INET; |
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| 100 | serv_addr.sin_port = htons(serverInfo->serverPort); |
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| 101 | memcpy((char *) &serv_addr.sin_addr.s_addr, (char *) server->h_addr, \ |
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| 102 | server->h_length); |
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| 103 | |
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| 104 | if(connect(serverInfo->socketFD, (struct sockaddr *) &serv_addr, \ |
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| 105 | sizeof(serv_addr)) < 0) |
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| 106 | ERROR(1, "Error connecting to remote socket."); |
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| 107 | } |
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| 108 | |
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[161] | 109 | |
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[176] | 110 | /* TODO I'm fairly certain this function is unnecessary, see function below for more details... |
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[161] | 111 | int32_t |
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| 112 | SendMessage(int32_t socketFD, char* message) |
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| 113 | { |
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| 114 | |
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| 115 | // TODO explain this. What, exactly, does the below line do and how does it |
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| 116 | // affect the rest of the function? |
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| 117 | strcat(message, "\0000"); |
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| 118 | |
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| 119 | ssize_t numSentBytes = send(socketFD, message, (strlen(message) + 1), 0); |
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| 120 | if(numSentBytes < 0) { |
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| 121 | ERROR(1, "Error sending to server."); |
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| 122 | } |
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| 123 | else if(numSentBytes == 0) { |
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| 124 | LOG("socket_comm::SendMessage - Server closed the socket.\n"); |
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| 125 | } |
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| 126 | |
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| 127 | return numSentBytes; |
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| 128 | } |
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[174] | 129 | */ |
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[161] | 130 | |
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[174] | 131 | // TODO this function is here to handle calls to send const char* messages. Note |
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| 132 | // that the std::string.c_str() function auto-appends a null character at the |
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| 133 | // end of the cstring, so the strcat function call in the previous function |
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| 134 | // isn't necessary here... I think... although I still don't really understand |
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| 135 | // what exactly that call is for. |
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| 136 | int32_t |
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| 137 | SendMessage(int32_t socketFD, const char* message) |
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| 138 | { |
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| 139 | ssize_t numSentBytes = send(socketFD, message, (strlen(message) + 1), 0); |
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| 140 | if(numSentBytes < 0) { |
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| 141 | ERROR(1, "Error sending to server."); |
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| 142 | } |
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| 143 | else if(numSentBytes == 0) { |
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| 144 | LOG("socket_comm::SendMessage - Server closed the socket.\n"); |
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| 145 | } |
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| 146 | |
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| 147 | return numSentBytes; |
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| 148 | } |
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[161] | 149 | |
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[174] | 150 | |
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[161] | 151 | // TODO This function is currently returning 1... always... is this necessary? |
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| 152 | // If we want a fail/success return type, then why aren't we ever returning a |
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| 153 | // failure? |
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| 154 | int32_t |
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| 155 | GetParameter(int32_t socketFD, struct Parameter pList[], \ |
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| 156 | struct CE_Info *ce_info) |
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| 157 | { |
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| 158 | char buffer[256]; |
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| 159 | memset(buffer, 0, 256); |
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| 160 | |
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| 161 | ReadMessage(socketFD, buffer); |
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| 162 | ce_info->numParameters = atoi(buffer); |
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| 163 | LOG("socket_comm::GetParameter - Number of parameters: %d\n", \ |
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| 164 | ce_info->numParameters); |
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| 165 | |
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| 166 | for(size_t i = 0; i < ce_info->numParameters; i++) { |
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| 167 | memset(buffer, 0, 256); |
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| 168 | ReadMessage(socketFD, buffer); |
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| 169 | LOG("socket_comm::GetParameter - Name: %s\n", buffer); |
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[173] | 170 | pList[i].name = std::string(buffer); |
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[161] | 171 | |
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| 172 | memset(buffer, 0, 256); |
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| 173 | ReadMessage(socketFD, buffer); |
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| 174 | LOG("socket_comm::GetParameter - Units: %s\n", buffer); |
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[173] | 175 | pList[i].units = std::string(buffer); |
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[161] | 176 | |
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| 177 | memset(buffer, 0, 256); |
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| 178 | ReadMessage(socketFD, buffer); |
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| 179 | LOG("socket_comm::GetParameter - Min: %s\n", buffer); |
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| 180 | pList[i].min = atof(buffer); |
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| 181 | |
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| 182 | memset(buffer, 0, 256); |
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| 183 | ReadMessage(socketFD, buffer); |
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| 184 | LOG("socket_comm::GetParameter - Max: %s\n", buffer); |
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| 185 | pList[i].max = atof(buffer); |
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| 186 | |
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| 187 | memset(buffer, 0, 256); |
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| 188 | ReadMessage(socketFD, buffer); |
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| 189 | LOG("socket_comm::GetParameter - Step: %s\n", buffer); |
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| 190 | pList[i].step = atof(buffer); |
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| 191 | |
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| 192 | memset(buffer, 0, 256); |
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| 193 | ReadMessage(socketFD, buffer); |
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| 194 | LOG("socket_comm::GetParameter - Value: %s\n", buffer); |
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| 195 | pList[i].value = atof(buffer); |
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| 196 | } |
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| 197 | |
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| 198 | return 1; |
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| 199 | } |
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| 200 | |
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| 201 | |
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| 202 | // TODO if we are just returing fail/success here, then why not return a bool |
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| 203 | // instead of an entire 32 bit integer? Seems wasteful. |
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| 204 | int32_t |
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| 205 | GetRequest(int32_t socketFD, struct Parameter pList[], struct CE_Info *ce_info) |
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| 206 | { |
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| 207 | char buffer[256]; |
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| 208 | memset(buffer, 0, 256); |
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| 209 | |
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| 210 | ReadMessage(socketFD, buffer); |
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| 211 | |
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| 212 | if(strcmp(buffer, "val") != 0) { |
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| 213 | LOG("socket_comm::GetRequest - Unexpected control data received.\n\n"); |
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| 214 | return 0; |
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| 215 | } |
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| 216 | |
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| 217 | LOG("socket_comm::GetRequest - Getting parameters.\n\n"); |
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| 218 | GetParameter(socketFD, pList, ce_info); |
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| 219 | |
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| 220 | return 1; |
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| 221 | } |
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| 222 | |
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[176] | 223 | |
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| 224 | int32_t |
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[177] | 225 | AcceptTCPConnection(int32_t serverSock) |
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[176] | 226 | { |
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[177] | 227 | struct sockaddr_in echoClientAddr; |
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[176] | 228 | |
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[177] | 229 | uint32_t clientLength = sizeof(echoClientAddr); |
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[176] | 230 | |
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[177] | 231 | int32_t clientSocket = accept(serverSock, NULL, NULL); |
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| 232 | if(clientSocket < 0) |
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[186] | 233 | ERROR(1, "Could not establish connection with client socket.\n"); |
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[176] | 234 | |
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[177] | 235 | LOG("Handling client %s\n", inet_ntoa(echoClientAddr.sin_addr)); |
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[176] | 236 | |
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[177] | 237 | return clientSocket; |
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[176] | 238 | } |
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| 239 | |
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[177] | 240 | |
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[176] | 241 | int32_t |
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| 242 | CreateTCPServerSocket(uint16_t port) |
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| 243 | { |
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[177] | 244 | struct sockaddr_in echoServerAddr; |
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[176] | 245 | |
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[177] | 246 | int32_t localSocket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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| 247 | if (localSocket < 0) |
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[176] | 248 | ERROR(1, "socket() failed\n"); |
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| 249 | |
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[177] | 250 | /* Construct the local address structure */ |
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[179] | 251 | memset(&echoServerAddr, 0, sizeof(echoServerAddr)); |
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| 252 | echoServerAddr.sin_family = AF_INET; |
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| 253 | echoServerAddr.sin_addr.s_addr = htonl(INADDR_ANY); |
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| 254 | echoServerAddr.sin_port = htons(port); |
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[176] | 255 | |
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| 256 | /* Bind to the local address */ |
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[177] | 257 | if(bind(localSocket, (struct sockaddr *) &echoServerAddr, \ |
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| 258 | sizeof(echoServerAddr)) < 0) |
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[176] | 259 | ERROR(1, "bind() failed\n"); |
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| 260 | |
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| 261 | /* Mark the socket so it will listen for incoming connections */ |
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[177] | 262 | if(listen(localSocket, 5) < 0) |
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| 263 | ERROR(1, "listen() failed\n"); |
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[176] | 264 | |
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[177] | 265 | return localSocket; |
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[176] | 266 | } |
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| 267 | |
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