1 | /********************************************************************\ |
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2 | |
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3 | Central data collector of the Evidence Control System |
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4 | |
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5 | - DColl subscribes to all services given by the configuration |
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6 | server and writes these to the data file at every update. |
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7 | - One data file per day is generated, with roll-over at 13:00 local time. |
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8 | - For each service, it creates a new service with '.hist' appended |
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9 | that contains a history of events kept within a ring buffer. Each |
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10 | entry will be the result of a conversion to double of the text |
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11 | written to the data file. Only if the new value has changed by a |
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12 | minimum amout it will be added to the ring buffer. |
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13 | - The history buffers are written to disk at program termination and |
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14 | are tired to be read when adding a service. |
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15 | - The command 'DColl/Log' writes the associated string to the log |
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16 | file specified in the configuration. |
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17 | |
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18 | Oliver Grimm, December 2009 |
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19 | |
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20 | \********************************************************************/ |
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21 | |
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22 | #define SERVER_NAME "DColl" |
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23 | |
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24 | #define DATE_ROLLOVER 12 // localtime hour after which next date is used |
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25 | |
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26 | #include "Evidence.h" |
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27 | |
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28 | #include <string> |
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29 | #include <sstream> |
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30 | #include <vector> |
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31 | #include <iomanip> |
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32 | |
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33 | #include <math.h> |
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34 | #include <float.h> |
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35 | #include <sys/stat.h> |
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36 | #include <ctype.h> |
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37 | #include <sys/types.h> |
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38 | #include <regex.h> |
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39 | |
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40 | // |
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41 | // Class declaration |
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42 | // |
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43 | class DataHandler: public DimClient, public DimBrowser, |
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44 | public EvidenceServer { |
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45 | |
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46 | struct Item { |
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47 | DimStampedInfo *DataItem; |
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48 | DimService *HistService; |
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49 | struct EvidenceHistoryItem *HistBuffer; |
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50 | int HistPointer; |
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51 | double LastValue; |
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52 | double MinAbsChange; |
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53 | }; |
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54 | vector<struct Item> List; |
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55 | |
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56 | DimCommand *LogCommand; |
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57 | |
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58 | FILE *DataFile; |
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59 | FILE *LogFile; |
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60 | char *Filename; |
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61 | float DataSizekB, LogSizekB; |
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62 | int DataSizeLastUpdate, LogSizeLastUpdate; |
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63 | char *DataDir; |
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64 | DimService *LogSizeService, *DataSizeService, *DataFilename; |
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65 | string HistDir; |
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66 | int HistSize; |
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67 | int SizeUpdateDelay; |
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68 | int TimeForNextFile; |
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69 | |
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70 | int RegExCount; |
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71 | regex_t *RegEx; |
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72 | double *MinChange; |
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73 | |
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74 | void infoHandler(); |
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75 | void commandHandler(); |
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76 | void AddService(string); |
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77 | float FileSize(FILE *); |
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78 | |
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79 | public: |
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80 | DataHandler(); |
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81 | ~DataHandler(); |
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82 | }; |
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83 | |
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84 | // |
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85 | // Constructor |
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86 | // |
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87 | DataHandler::DataHandler(): EvidenceServer(SERVER_NAME) { |
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88 | |
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89 | // Initialization to prevent freeing unallocated memory |
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90 | DataFile = NULL; |
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91 | LogFile = NULL; |
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92 | Filename = NULL; |
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93 | |
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94 | LogSizeService = NULL; |
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95 | DataSizeService = NULL; |
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96 | |
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97 | DataSizeLastUpdate = 0; |
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98 | LogSizeLastUpdate = 0; |
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99 | TimeForNextFile = 0; |
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100 | |
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101 | // Request configuration data |
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102 | char *Change = GetConfig(SERVER_NAME " minchange"); |
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103 | |
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104 | DataDir = GetConfig(SERVER_NAME " datadir"); |
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105 | |
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106 | char *Logname = GetConfig(SERVER_NAME " logfile"); |
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107 | |
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108 | SizeUpdateDelay = atoi(GetConfig(SERVER_NAME " sizeupdate")); |
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109 | |
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110 | HistSize = atoi(GetConfig(SERVER_NAME " histsize")); |
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111 | if (HistSize < 1) HistSize = 1; // Minimum one items |
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112 | |
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113 | HistDir = GetConfig(SERVER_NAME " histdir"); |
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114 | |
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115 | // Open log file |
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116 | if ((LogFile = fopen(Logname, "a")) == NULL) { |
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117 | State(FATAL, "Could not open log file '%s' (%s)", Logname, strerror(errno)); |
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118 | } |
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119 | |
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120 | // Provide logging command |
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121 | LogCommand = new DimCommand("DColl/Log", (char *) "C", this); |
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122 | |
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123 | // Create services for file sizes and data file name |
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124 | DataSizekB = 0; |
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125 | DataSizeService = new DimService(SERVER_NAME "/DataSizekB", DataSizekB); |
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126 | |
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127 | LogSizekB = FileSize(LogFile); |
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128 | LogSizeService = new DimService(SERVER_NAME "/LogSizekB", LogSizekB); |
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129 | |
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130 | DataFilename = new DimService(SERVER_NAME "/CurrentFile", (char *) ""); |
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131 | |
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132 | // Count how many minimum change value regular expressions are present |
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133 | RegExCount = 0; |
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134 | char *Token = strtok(Change, "\t "); |
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135 | while (Token != NULL) { |
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136 | RegExCount++; |
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137 | Token = strtok(NULL, "\t "); |
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138 | } |
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139 | |
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140 | // Allocate memory for regular expressions and minimum change values |
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141 | RegEx = new regex_t[RegExCount]; |
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142 | MinChange = new double [RegExCount]; |
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143 | |
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144 | // Compile regular expressions |
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145 | int Pos = 0; |
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146 | for (int i=0; i<RegExCount; i++) { |
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147 | int Len = strlen(Change+Pos) + 1; |
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148 | Token = strtok(Change + Pos, ": \t"); |
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149 | |
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150 | int Ret = regcomp(&RegEx[i], Token, REG_EXTENDED|REG_NOSUB); |
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151 | if (Ret != 0) { |
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152 | char ErrMsg[200]; |
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153 | regerror(Ret, &RegEx[i], ErrMsg, sizeof(ErrMsg)); |
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154 | State(WARN, "Error compiling regular expression '%s' (%s)", Token, ErrMsg); |
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155 | } |
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156 | else { |
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157 | if ((Token=strtok(NULL, "")) != NULL) MinChange[i] = atof(Token); |
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158 | else MinChange[i] = 0; |
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159 | } |
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160 | Pos += Len; |
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161 | } |
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162 | |
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163 | // Subscribe to list of servers at DIS_DNS |
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164 | AddService("DIS_DNS/SERVER_LIST"); |
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165 | |
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166 | DimClient::sendCommand("DColl/Log", SERVER_NAME" *** Logging started ***"); |
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167 | } |
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168 | |
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169 | // |
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170 | // Destructor: Close files and free memory |
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171 | // |
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172 | DataHandler::~DataHandler() { |
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173 | |
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174 | DimClient::sendCommand("DColl/Log", SERVER_NAME" *** Logging stopped ***"); |
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175 | |
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176 | // Delete DIM subscriptions and command first so handlers and not called anymore |
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177 | for (int i=0; i<List.size(); i++) { |
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178 | delete List[i].DataItem; |
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179 | } |
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180 | delete LogCommand; |
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181 | |
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182 | // Save history buffers to files (replace '/' by '_') |
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183 | for (int i=0; i<List.size(); i++) { |
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184 | string Name = List[i].HistService->getName(); |
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185 | for (int j=0; j<Name.size(); j++) if (Name[j] == '/') Name[j] = '_'; |
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186 | FILE *File = fopen((HistDir + "/" + Name).c_str(), "wb"); |
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187 | if (File != NULL) { |
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188 | fwrite(&List[i].HistPointer, sizeof(List[i].HistPointer), 1, File); |
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189 | fwrite(List[i].HistBuffer, sizeof(EvidenceHistoryItem), HistSize, File); |
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190 | fclose(File); |
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191 | } |
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192 | delete List[i].HistService; |
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193 | delete[] List[i].HistBuffer; |
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194 | } |
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195 | |
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196 | delete DataFilename; |
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197 | delete[] Filename; |
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198 | |
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199 | //delete LogSizeService; // These create segmentation faults?! |
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200 | //delete DataSizeService; |
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201 | |
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202 | // Close files |
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203 | if (LogFile != NULL) if (fclose(LogFile) != 0) { |
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204 | State(ERROR, "Could not close log file (%s)", strerror(errno)); |
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205 | } |
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206 | if (DataFile != NULL && fclose(DataFile) != 0) { |
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207 | State(ERROR, "Error: Could not close data file (%s)", strerror(errno)); |
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208 | } |
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209 | |
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210 | // Free memory for regular expressions handling |
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211 | for (int i=0; i<RegExCount; i++) { |
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212 | regfree(&RegEx[i]); |
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213 | } |
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214 | delete[] MinChange; |
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215 | delete[] RegEx; |
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216 | } |
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217 | |
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218 | // |
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219 | // Implementation of data handling |
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220 | // |
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221 | // DIM ensures infoHandler() is called serialized, therefore |
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222 | // no mutex is needed to serialize writing to the file |
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223 | void DataHandler::infoHandler() { |
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224 | |
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225 | DimInfo *Info = getInfo(); |
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226 | |
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227 | // Check if service available |
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228 | if (Info->getSize()==strlen(NO_LINK)+1 && strcmp(Info->getString(), NO_LINK)==0) return; |
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229 | |
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230 | // If service is DIS_DNS/SERVER_LIST, subscribe to all SERVICE_LIST services |
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231 | if (strcmp(Info->getName(), "DIS_DNS/SERVER_LIST") == 0) { |
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232 | char *Token = strtok(Info->getString(), "@"); |
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233 | while (Token != NULL) { |
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234 | if (isalpha(*Token) == 0) Token++; // Name can start with +,-,! |
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235 | |
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236 | AddService(string(Token)+"/SERVICE_LIST"); |
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237 | |
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238 | Token = strtok(NULL, "|"); |
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239 | Token = strtok(NULL, "|@"); // ???? Why needed ????? |
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240 | } |
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241 | return; |
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242 | } |
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243 | |
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244 | // If service is SERVICE_LIST of any server, scan all services. |
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245 | // Subscribe to all services (but not to commands and RPCs) |
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246 | if (strstr(Info->getName(), "/SERVICE_LIST") != NULL) { |
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247 | |
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248 | char *Name = strtok(Info->getString(), "|"); |
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249 | while (Name != NULL) { |
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250 | char *Type = strtok(NULL, "\n"); |
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251 | if (Type == NULL) return; // for safety, should not happen |
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252 | if (isalpha(*Name) == 0) Name++; // Name can start with +,-,! |
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253 | if (strstr(Type, "|CMD")==NULL && strstr(Type, "|RPC")==NULL) { |
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254 | AddService(Name); |
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255 | } |
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256 | Name = strtok(NULL, "|"); |
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257 | } |
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258 | return; |
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259 | } |
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260 | |
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261 | // If it is time to open new data file, close the current one |
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262 | if (time(NULL) >= TimeForNextFile) { |
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263 | if (DataFile != NULL && fclose(DataFile) != 0) { |
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264 | State(ERROR, "Error: Could not close data file (%s)", strerror(errno)); |
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265 | } |
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266 | DataFile = NULL; |
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267 | } |
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268 | |
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269 | // Open new data file if necessary |
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270 | if (DataFile == NULL) { |
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271 | time_t Time = time(NULL); |
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272 | struct tm *T = localtime(&Time); |
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273 | ostringstream Buf; |
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274 | |
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275 | // Generate file name from date |
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276 | if(T->tm_hour >= DATE_ROLLOVER) T->tm_mday++; |
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277 | if (mktime(T) == -1) State(ERROR, "mktime() failed, check filename"); |
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278 | Buf << DataDir << "/" << T->tm_year+1900 << setw(2) << setfill('0') << T->tm_mon+1 << T->tm_mday << ".slow"; |
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279 | |
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280 | // Copy filename to permanent buffer |
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281 | delete[] Filename; |
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282 | Filename = new char [Buf.str().size()+1]; |
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283 | strcpy(Filename, Buf.str().c_str()); |
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284 | |
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285 | // Open file |
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286 | if ((DataFile = fopen(Filename, "a")) == NULL) { |
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287 | State(FATAL, "Could not open data file '%s' (%s)", Filename, strerror(errno)); |
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288 | } |
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289 | else State(INFO, "Opened data file '%s'", Filename); |
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290 | DataFilename->updateService(Filename); |
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291 | |
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292 | // Calculate time for next file opening |
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293 | T->tm_sec = 0; |
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294 | T->tm_min = 0; |
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295 | T->tm_hour = DATE_ROLLOVER; |
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296 | TimeForNextFile = mktime(T); |
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297 | } |
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298 | |
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299 | // Identify index of service |
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300 | int Service; |
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301 | for (Service=0; Service<List.size(); Service++) if (Info == List[Service].DataItem) break; |
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302 | if (Service == List.size()) return; // Service not found |
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303 | |
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304 | // If negative value for absolute change, ignore this entry |
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305 | if (List[Service].MinAbsChange < 0) return; |
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306 | |
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307 | // Write data header |
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308 | time_t RawTime = Info->getTimestamp(); |
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309 | struct tm *TM = localtime(&RawTime); |
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310 | |
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311 | fprintf(DataFile, "%s %d %d %d %d %d %d %d %lu ", Info->getName(), TM->tm_year+1900, TM->tm_mon+1, TM->tm_mday, TM->tm_hour, TM->tm_min, TM->tm_sec, Info->getTimestampMillisecs(), Info->getTimestamp()); |
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312 | |
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313 | // Translate data into ASCII |
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314 | char *Text = EvidenceServer::ToString(Info); |
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315 | if (Text != NULL) { |
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316 | // Replace all control characters by white space |
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317 | for (int i=0; i<strlen(Text); i++) if (iscntrl(Text[i])) Text[i] = ' '; |
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318 | |
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319 | // Write to file |
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320 | fprintf(DataFile, "%s\n", Text); |
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321 | |
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322 | // Add to history buffer if change large enough |
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323 | if ((fabs(atof(Text)-List[Service].LastValue) > List[Service].MinAbsChange)) { |
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324 | List[Service].HistBuffer[List[Service].HistPointer].Seconds = Info->getTimestamp(); |
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325 | List[Service].HistBuffer[List[Service].HistPointer].Value = atof(Text); |
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326 | List[Service].HistService->updateService(); |
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327 | List[Service].HistPointer++; |
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328 | if (List[Service].HistPointer >= HistSize) List[Service].HistPointer = 0; |
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329 | List[Service].LastValue = atof(Text); |
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330 | } |
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331 | free(Text); |
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332 | } |
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333 | else fprintf(DataFile, "Cannot interpret format identifier\n"); |
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334 | |
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335 | fflush(DataFile); |
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336 | |
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337 | // Terminate if error because otherwise infinite loop might result as |
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338 | // next call to this infoHandler() will try to (re-)open file |
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339 | if(ferror(DataFile)) { |
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340 | fclose(DataFile); |
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341 | DataFile = NULL; |
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342 | State(FATAL, "Error writing to data file, closed file (%s)", strerror(errno)); |
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343 | } |
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344 | |
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345 | // Update datafile size service |
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346 | if (time(NULL) - DataSizeLastUpdate > SizeUpdateDelay) { |
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347 | DataSizekB = FileSize(DataFile); |
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348 | DataSizeService->updateService(); |
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349 | DataSizeLastUpdate = time(NULL); |
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350 | } |
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351 | } |
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352 | |
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353 | // |
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354 | // Implementation of log writing |
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355 | // |
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356 | void DataHandler::commandHandler() { |
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357 | |
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358 | if (getCommand() != LogCommand || LogFile == NULL) return; |
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359 | |
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360 | // Replace all carriage-return by line feed and non-printable characters |
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361 | char *Text = getCommand()->getString(); |
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362 | for (unsigned int i=0; i<strlen(Text); i++) { |
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363 | if (Text[i] == '\r') Text[i] = '\n'; |
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364 | if(isprint(Text[i])==0 && isspace(Text[i])==0) Text[i] = ' '; |
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365 | } |
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366 | |
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367 | time_t RawTime = time(NULL); |
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368 | struct tm *TM = localtime(&RawTime); |
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369 | |
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370 | fprintf(LogFile, "%d/%d/%d %d:%d:%d: %s\n", |
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371 | TM->tm_mday, TM->tm_mon+1, TM->tm_year+1900, |
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372 | TM->tm_hour, TM->tm_min, TM->tm_sec, Text); |
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373 | |
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374 | fflush(LogFile); |
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375 | |
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376 | // If error close file (otherwise infinite loop because State() also writes to log) |
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377 | if(ferror(LogFile)) { |
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378 | fclose(LogFile); |
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379 | LogFile = NULL; |
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380 | State(ERROR, "Error writing to log file, closing file (%s)", strerror(errno)); |
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381 | } |
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382 | |
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383 | // Update logfile size service |
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384 | if (time(NULL) - LogSizeLastUpdate > SizeUpdateDelay) { |
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385 | LogSizekB = FileSize(LogFile); |
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386 | LogSizeService->updateService(); |
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387 | LogSizeLastUpdate = time(NULL); |
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388 | } |
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389 | } |
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390 | |
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391 | |
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392 | // |
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393 | // Add service to watch list |
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394 | // |
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395 | void DataHandler::AddService(string Name) { |
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396 | |
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397 | // Do not subscribe to history services (otherwise infinite loop) |
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398 | if (Name.find(".hist") != string::npos) return; |
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399 | |
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400 | // Check if already subscribed to this service |
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401 | for (int i=0; i<List.size(); i++) { |
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402 | if (Name == List[i].DataItem->getName()) return; |
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403 | } |
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404 | |
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405 | // Create new entry in item list |
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406 | struct Item New; |
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407 | |
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408 | // Set minimum required change by comparing to regular expressions |
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409 | New.MinAbsChange = 0; |
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410 | for (int i=0; i<RegExCount; i++) { |
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411 | if (regexec(&RegEx[i], Name.c_str(), (size_t) 0, NULL, 0) == 0) { |
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412 | New.MinAbsChange = MinChange[i]; |
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413 | } |
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414 | } |
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415 | |
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416 | // Create history service |
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417 | New.HistBuffer = new struct EvidenceHistoryItem [HistSize]; |
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418 | memset(New.HistBuffer, 0, HistSize*sizeof(EvidenceHistoryItem)); |
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419 | New.HistPointer = 0; |
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420 | New.LastValue = DBL_MAX; |
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421 | New.HistService = new DimService ((Name+".hist").c_str(), (char *) "C", |
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422 | New.HistBuffer, HistSize*sizeof(EvidenceHistoryItem)); |
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423 | |
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424 | // Load history buffer from file if existing |
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425 | string Filename = New.HistService->getName(); |
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426 | for (int j=0; j<Filename.size(); j++) if (Filename[j] == '/') Filename[j] = '_'; |
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427 | FILE *File = fopen((HistDir + "/" + Filename).c_str(), "rb"); |
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428 | if (File != NULL) { |
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429 | fread(&New.HistPointer, sizeof(New.HistPointer), 1, File); |
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430 | fread(New.HistBuffer, sizeof(EvidenceHistoryItem), HistSize, File); |
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431 | fclose(File); |
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432 | } |
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433 | |
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434 | // Subscribe to service |
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435 | New.DataItem = new DimStampedInfo(Name.c_str(), NO_LINK, this); |
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436 | |
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437 | // Add item to list |
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438 | List.push_back(New); |
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439 | } |
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440 | |
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441 | // |
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442 | // Determine size of file in kB |
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443 | // |
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444 | float DataHandler::FileSize(FILE *File) { |
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445 | |
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446 | struct stat FileStatus; |
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447 | |
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448 | if (fstat(fileno(File), &FileStatus) == -1) { |
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449 | State(WARN, "Could not determine size of file (%s)", strerror(errno)); |
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450 | return -1; |
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451 | } |
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452 | |
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453 | return (float) FileStatus.st_size/1024; |
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454 | } |
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455 | |
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456 | // |
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457 | // Main program |
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458 | // |
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459 | int main() { |
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460 | |
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461 | // Static ensures calling of destructor by exit() |
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462 | static DataHandler Data; |
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463 | |
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464 | // Sleep until signal caught |
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465 | pause(); |
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466 | } |
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