[98] | 1 | #include <stdio.h> |
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| 2 | #include <sys/types.h> |
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| 3 | #include <sys/socket.h> |
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| 4 | #include <netinet/in.h> |
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| 5 | #include <netdb.h> |
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| 6 | #include <stdlib.h> |
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| 7 | #include <string.h> |
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| 8 | |
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[125] | 9 | #include <vtcross/cbr.h> |
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[98] | 10 | |
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| 11 | #define CR_PORT 30002 |
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| 12 | |
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| 13 | struct CE_Info { |
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| 14 | int numUtilities; |
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| 15 | int numParameters; |
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| 16 | int numObservables; |
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| 17 | }; |
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| 18 | |
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| 19 | struct Parameter { |
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| 20 | /*string name; |
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| 21 | string units;*/ |
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| 22 | char name[50]; |
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| 23 | char units[50]; |
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| 24 | float min; |
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| 25 | float max; |
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| 26 | float step; |
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| 27 | float value; |
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| 28 | }; |
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| 29 | |
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| 30 | // error handling |
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| 31 | void error(char *msg) |
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| 32 | { |
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| 33 | perror(msg); |
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| 34 | exit(0); |
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| 35 | } |
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| 36 | |
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| 37 | void ReadMessage(int socket,char * buffer) { |
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| 38 | int i,n; |
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| 39 | |
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| 40 | n = recv(socket,buffer,256,MSG_PEEK); |
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| 41 | for(i=0;i<256;i++){ |
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| 42 | if(strcmp(&buffer[i],"\0") == 0) break; |
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| 43 | } |
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| 44 | n = recv(socket,buffer,i+1,0); |
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| 45 | if (n < 0) |
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| 46 | error("ERROR reading from socket"); |
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| 47 | //printf("ReadMessage:%s %d\n",buffer,n); |
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| 48 | } |
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| 49 | |
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| 50 | // setup client socket connection |
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| 51 | int ClientSocket(int argc, char** argv) |
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| 52 | { |
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| 53 | int sockfd; |
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| 54 | int portno; |
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| 55 | struct sockaddr_in serv_addr; |
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| 56 | struct hostent *server; |
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| 57 | |
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| 58 | // server name |
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| 59 | server = gethostbyname(argv[1]); |
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| 60 | if (server == NULL) { |
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| 61 | fprintf(stderr,"ERROR, no such host\n"); |
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| 62 | exit(0); |
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| 63 | } |
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| 64 | // port no. |
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| 65 | portno = atoi(argv[2]); |
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| 66 | // socket file descriptor |
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| 67 | sockfd = socket(AF_INET, SOCK_STREAM, 0); |
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| 68 | if (sockfd < 0) |
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| 69 | error("ERROR opening socket"); |
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| 70 | // initiate struct socketaddr_in |
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| 71 | bzero((char *) &serv_addr, sizeof(serv_addr)); |
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| 72 | serv_addr.sin_family = AF_INET; |
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| 73 | serv_addr.sin_port = htons(portno); |
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| 74 | bcopy((char *)server->h_addr, |
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| 75 | (char *)&serv_addr.sin_addr.s_addr, |
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| 76 | server->h_length); |
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| 77 | // cast sockaddr_in to sockaddr |
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| 78 | if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) |
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| 79 | error("ERROR connecting"); |
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| 80 | |
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| 81 | return sockfd; |
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| 82 | } |
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| 83 | |
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| 84 | |
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| 85 | int SendMessage(int socketfd, char *message) |
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| 86 | { |
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| 87 | int n; |
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| 88 | |
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| 89 | strcat(message, "\0000"); |
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| 90 | n = send(socketfd,message,(strlen(message)+1),0); |
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| 91 | if (n<0) |
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| 92 | error("Error sending to server\n"); |
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| 93 | else if(n == 0) |
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| 94 | printf("Server closed the socket.\n"); |
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| 95 | |
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| 96 | return n; |
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| 97 | } |
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| 98 | |
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| 99 | int GetParameter(int sockfd, struct Parameter pList[], struct CE_Info *ce_info) |
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| 100 | { |
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| 101 | char buffer[256]; |
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| 102 | int i; |
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| 103 | |
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| 104 | // numParameters |
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| 105 | bzero(buffer,256); |
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| 106 | ReadMessage(sockfd,buffer); |
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| 107 | ce_info->numParameters = atoi(buffer); |
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| 108 | printf("number of parameters: %d\n", ce_info->numParameters); |
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| 109 | |
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| 110 | for (i = 0; i < ce_info->numParameters; i++){ |
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| 111 | bzero(buffer,256); |
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| 112 | ReadMessage(sockfd,buffer); |
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| 113 | printf("Name: %s\n", buffer); |
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| 114 | strcpy(pList[i].name, buffer); |
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| 115 | |
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| 116 | bzero(buffer,256); |
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| 117 | ReadMessage(sockfd,buffer); |
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| 118 | printf("Units: %s\n", buffer); |
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| 119 | strcpy(pList[i].units, buffer); |
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| 120 | |
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| 121 | bzero(buffer,256); |
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| 122 | ReadMessage(sockfd,buffer); |
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| 123 | printf("Min: %s\n", buffer); |
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| 124 | pList[i].min = atof(buffer); |
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| 125 | |
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| 126 | bzero(buffer,256); |
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| 127 | ReadMessage(sockfd,buffer); |
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| 128 | printf("Max: %s\n", buffer); |
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| 129 | pList[i].max = atof(buffer); |
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| 130 | |
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| 131 | bzero(buffer,256); |
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| 132 | ReadMessage(sockfd,buffer); |
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| 133 | printf("Step: %s\n", buffer); |
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| 134 | pList[i].step = atof(buffer); |
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| 135 | |
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| 136 | bzero(buffer,256); |
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| 137 | ReadMessage(sockfd,buffer); |
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| 138 | printf("Value: %s\n", buffer); |
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| 139 | pList[i].value = atof(buffer); |
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| 140 | |
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| 141 | } |
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| 142 | return 1; |
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| 143 | } |
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| 144 | |
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| 145 | |
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| 146 | int GetRequest(int sockfd, struct Parameter pList[], struct CE_Info *ce_info) |
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| 147 | { |
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| 148 | char buffer[256]; |
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| 149 | |
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| 150 | // Get control identifier |
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| 151 | // Possibly could implement some sort of authentication here |
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| 152 | bzero(buffer,256); |
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| 153 | ReadMessage(sockfd,buffer); |
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| 154 | |
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| 155 | if(strcmp(buffer,"val") != 0) { |
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| 156 | printf("Policy Engine:: Unexpected control data received.\n\n"); |
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| 157 | return 0; |
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| 158 | } |
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| 159 | |
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| 160 | printf("Policy Engine:: Getting parameters.\n\n"); |
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| 161 | // Get potenial transmission parameter values |
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| 162 | GetParameter(sockfd, pList, ce_info); |
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| 163 | |
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| 164 | return 1; |
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| 165 | } |
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| 166 | |
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| 167 | int ValidateTransmissionParameters(struct Parameter pList[], struct CE_Info *ce_info, int decision_array[]) |
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| 168 | { |
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| 169 | int i = 0; |
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| 170 | // Decision array holds parameter decision |
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| 171 | // 1 = OK |
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| 172 | // 0 = FAIL |
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| 173 | |
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| 174 | printf("Policy Engine:: Policies Validated.\n\n"); |
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| 175 | for (i = 0; i < ce_info->numParameters; i++){ |
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| 176 | decision_array[i] = 1; |
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| 177 | } |
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| 178 | |
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| 179 | return 1; |
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| 180 | } |
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| 181 | |
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| 182 | |
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| 183 | int RegisterPE(int sockfd) |
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| 184 | { |
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| 185 | // Send register message to cognitive radio |
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| 186 | SendMessage(sockfd, "p_register"); |
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| 187 | printf("Policy Engine:: Registration message sent.\n\n"); |
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| 188 | return 1; |
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| 189 | } |
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| 190 | |
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| 191 | int SendCEDecision(int sockfd, struct Parameter pList[], struct CE_Info *ce_info, int decision_array[]) |
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| 192 | { |
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| 193 | // send results back to server |
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| 194 | char var[50]; |
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| 195 | int i; |
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| 196 | |
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| 197 | // parameter |
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| 198 | for (i = 0; i < ce_info->numParameters; i++){ |
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| 199 | sprintf(var, "%i", decision_array[i]); |
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| 200 | SendMessage(sockfd, var); |
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| 201 | } |
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| 202 | |
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| 203 | return 1; |
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| 204 | } |
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| 205 | |
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| 206 | int ParsePolicies() { |
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| 207 | |
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| 208 | printf("Policy Engine:: Policies parsed.\n\n"); |
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| 209 | |
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| 210 | return 1; |
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| 211 | } |
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| 212 | |
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| 213 | // main client socket |
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| 214 | int main(int argc, char *argv[]) |
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| 215 | { |
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| 216 | int decision_array[10]; |
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| 217 | struct Parameter pList[10]; |
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| 218 | struct CE_Info ce_info; |
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| 219 | int sockfd; |
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| 220 | int ret = 0; |
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| 221 | |
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| 222 | // setup client socket connection |
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| 223 | if (argc < 3) { |
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| 224 | fprintf(stderr,"usage: %s hostname port\n", argv[0]); |
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| 225 | exit(0); |
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| 226 | } |
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| 227 | |
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| 228 | // setup client socket connection with server |
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| 229 | sockfd = ClientSocket(argc, argv); |
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| 230 | |
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| 231 | // Parse initial Policies |
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| 232 | printf("Policy Engine:: Parsing local policies.\n\n"); |
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| 233 | ret = ParsePolicies(); |
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| 234 | |
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| 235 | ret = RegisterPE(sockfd); |
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| 236 | |
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| 237 | while(1) { |
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| 238 | |
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| 239 | printf("Policy Engine:: Waiting for Policy Check Request.\n\n"); |
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| 240 | ret = GetRequest(sockfd, pList, &ce_info); |
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| 241 | |
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| 242 | if(ret == 1) { |
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| 243 | printf("Policy Engine:: Validating Transmission Parameters.\n\n"); |
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| 244 | ValidateTransmissionParameters(pList, &ce_info, decision_array); |
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| 245 | |
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| 246 | printf("Policy Engine:: Sending Policy decision to Server.\n\n"); |
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| 247 | SendCEDecision(sockfd, pList, &ce_info, decision_array); |
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| 248 | } |
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| 249 | } |
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| 250 | |
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| 251 | return 0; |
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| 252 | } |
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