1 | #include <cstdlib> |
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2 | #include <cstdio> |
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3 | #include <sys/types.h> |
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4 | #include <sys/socket.h> |
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5 | #include <netinet/in.h> |
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6 | #include <netdb.h> |
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7 | #include <string> |
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8 | #include <string.h> |
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9 | |
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10 | #include "vtcross/cbr.h" |
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11 | #include "vtcross/containers.h" |
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12 | #include "vtcross/common.h" |
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13 | |
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14 | |
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15 | #define CR_PORT 30002 |
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16 | |
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17 | // error handling |
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18 | void error(char *msg) |
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19 | { |
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20 | perror(msg); |
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21 | exit(0); |
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22 | } |
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23 | |
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24 | void ReadMessage(int socket,char * buffer) { |
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25 | int i,n; |
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26 | |
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27 | n = recv(socket,buffer,256,MSG_PEEK); |
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28 | for(i=0;i<256;i++){ |
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29 | if(strcmp(&buffer[i],"\0") == 0) break; |
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30 | } |
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31 | n = recv(socket,buffer,i+1,0); |
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32 | if (n < 0) |
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33 | error("ERROR reading from socket"); |
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34 | //printf("ReadMessage:%s %d\n",buffer,n); |
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35 | } |
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36 | |
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37 | // setup client socket connection |
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38 | int ClientSocket(int argc, char** argv) |
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39 | { |
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40 | int sockfd; |
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41 | int portno; |
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42 | struct sockaddr_in serv_addr; |
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43 | struct hostent *server; |
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44 | |
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45 | // server name |
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46 | server = gethostbyname(argv[1]); |
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47 | if (server == NULL) { |
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48 | fprintf(stderr,"ERROR, no such host\n"); |
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49 | exit(0); |
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50 | } |
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51 | // port no. |
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52 | portno = atoi(argv[2]); |
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53 | // socket file descriptor |
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54 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
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55 | if (sockfd < 0) |
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56 | error("ERROR opening socket"); |
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57 | // initiate struct socketaddr_in |
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58 | bzero((char *) &serv_addr, sizeof(serv_addr)); |
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59 | serv_addr.sin_family = AF_INET; |
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60 | serv_addr.sin_port = htons(portno); |
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61 | bcopy((char *)server->h_addr, |
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62 | (char *)&serv_addr.sin_addr.s_addr, |
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63 | server->h_length); |
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64 | // cast sockaddr_in to sockaddr |
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65 | if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) |
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66 | error("ERROR connecting"); |
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67 | |
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68 | return sockfd; |
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69 | } |
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70 | |
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71 | |
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72 | int SendMessage(int socketfd, char *message) |
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73 | { |
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74 | int n; |
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75 | |
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76 | strcat(message, "\0000"); |
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77 | n = send(socketfd,message,(strlen(message)+1),0); |
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78 | if (n<0) |
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79 | error("Error sending to server\n"); |
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80 | else if(n == 0) |
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81 | printf("Server closed the socket.\n"); |
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82 | |
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83 | return n; |
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84 | } |
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85 | |
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86 | int GetParameter(int sockfd, struct Parameter pList[], struct CE_Info *ce_info) |
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87 | { |
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88 | char buffer[256]; |
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89 | int i; |
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90 | |
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91 | // numParameters |
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92 | bzero(buffer,256); |
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93 | ReadMessage(sockfd,buffer); |
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94 | ce_info->numParameters = atoi(buffer); |
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95 | printf("number of parameters: %d\n", ce_info->numParameters); |
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96 | |
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97 | for (i = 0; i < ce_info->numParameters; i++){ |
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98 | bzero(buffer,256); |
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99 | ReadMessage(sockfd,buffer); |
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100 | printf("Name: %s\n", buffer); |
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101 | pList[i].name = std::string(buffer); |
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102 | // strcpy(pList[i].name.c_str(), buffer); |
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103 | |
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104 | bzero(buffer,256); |
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105 | ReadMessage(sockfd,buffer); |
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106 | printf("Units: %s\n", buffer); |
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107 | pList[i].units = std::string(buffer); |
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108 | // strcpy(pList[i].units.c_str(), buffer); |
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109 | |
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110 | bzero(buffer,256); |
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111 | ReadMessage(sockfd,buffer); |
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112 | printf("Min: %s\n", buffer); |
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113 | pList[i].min = atof(buffer); |
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114 | |
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115 | bzero(buffer,256); |
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116 | ReadMessage(sockfd,buffer); |
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117 | printf("Max: %s\n", buffer); |
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118 | pList[i].max = atof(buffer); |
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119 | |
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120 | bzero(buffer,256); |
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121 | ReadMessage(sockfd,buffer); |
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122 | printf("Step: %s\n", buffer); |
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123 | pList[i].step = atof(buffer); |
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124 | |
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125 | bzero(buffer,256); |
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126 | ReadMessage(sockfd,buffer); |
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127 | printf("Value: %s\n", buffer); |
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128 | pList[i].value = atof(buffer); |
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129 | |
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130 | } |
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131 | return 1; |
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132 | } |
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133 | |
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134 | |
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135 | int GetRequest(int sockfd, struct Parameter pList[], struct CE_Info *ce_info) |
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136 | { |
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137 | char buffer[256]; |
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138 | |
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139 | // Get control identifier |
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140 | // Possibly could implement some sort of authentication here |
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141 | bzero(buffer,256); |
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142 | ReadMessage(sockfd,buffer); |
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143 | |
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144 | if(strcmp(buffer,"val") != 0) { |
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145 | printf("Policy Engine:: Unexpected control data received.\n\n"); |
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146 | return 0; |
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147 | } |
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148 | |
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149 | printf("Policy Engine:: Getting parameters.\n\n"); |
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150 | // Get potenial transmission parameter values |
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151 | GetParameter(sockfd, pList, ce_info); |
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152 | |
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153 | return 1; |
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154 | } |
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155 | |
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156 | int ValidateTransmissionParameters(struct Parameter pList[], struct CE_Info *ce_info, int decision_array[]) |
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157 | { |
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158 | int i = 0; |
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159 | // Decision array holds parameter decision |
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160 | // 1 = OK |
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161 | // 0 = FAIL |
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162 | |
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163 | printf("Policy Engine:: Policies Validated.\n\n"); |
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164 | for (i = 0; i < ce_info->numParameters; i++){ |
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165 | decision_array[i] = 1; |
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166 | } |
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167 | |
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168 | return 1; |
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169 | } |
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170 | |
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171 | |
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172 | int RegisterPE(int sockfd) |
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173 | { |
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174 | // Send register message to cognitive radio |
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175 | SendMessage(sockfd, "p_register"); |
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176 | printf("Policy Engine:: Registration message sent.\n\n"); |
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177 | return 1; |
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178 | } |
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179 | |
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180 | int SendCEDecision(int sockfd, struct Parameter pList[], struct CE_Info *ce_info, int decision_array[]) |
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181 | { |
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182 | // send results back to server |
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183 | char var[50]; |
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184 | int i; |
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185 | |
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186 | // parameter |
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187 | for (i = 0; i < ce_info->numParameters; i++){ |
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188 | sprintf(var, "%i", decision_array[i]); |
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189 | SendMessage(sockfd, var); |
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190 | } |
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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 | int ParsePolicies() { |
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196 | |
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197 | printf("Policy Engine:: Policies parsed.\n\n"); |
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198 | |
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199 | return 1; |
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200 | } |
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201 | |
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202 | // main client socket |
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203 | int main(int argc, char *argv[]) |
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204 | { |
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205 | int decision_array[10]; |
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206 | struct Parameter pList[10]; |
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207 | struct CE_Info ce_info; |
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208 | int sockfd; |
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209 | int ret = 0; |
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210 | |
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211 | // setup client socket connection |
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212 | if (argc < 3) { |
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213 | fprintf(stderr,"usage: %s hostname port\n", argv[0]); |
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214 | exit(0); |
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215 | } |
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216 | |
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217 | // setup client socket connection with server |
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218 | sockfd = ClientSocket(argc, argv); |
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219 | |
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220 | // Parse initial Policies |
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221 | printf("Policy Engine:: Parsing local policies.\n\n"); |
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222 | ret = ParsePolicies(); |
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223 | |
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224 | ret = RegisterPE(sockfd); |
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225 | |
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226 | while(1) { |
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227 | |
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228 | printf("Policy Engine:: Waiting for Policy Check Request.\n\n"); |
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229 | ret = GetRequest(sockfd, pList, &ce_info); |
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230 | |
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231 | if(ret == 1) { |
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232 | printf("Policy Engine:: Validating Transmission Parameters.\n\n"); |
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233 | ValidateTransmissionParameters(pList, &ce_info, decision_array); |
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234 | |
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235 | printf("Policy Engine:: Sending Policy decision to Server.\n\n"); |
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236 | SendCEDecision(sockfd, pList, &ce_info, decision_array); |
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237 | } |
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238 | } |
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239 | |
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240 | return 0; |
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241 | } |
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