1 | /********************************************************************\ |
---|
2 | |
---|
3 | Central data collector of the Evidence Control System |
---|
4 | |
---|
5 | - DColl subscribes to all services given by the configuration |
---|
6 | server and writes these to the data file at every update. |
---|
7 | - One data file per day is generated, with roll-over at 13:00 local time. |
---|
8 | - For each service, it creates a new service with '.hist' appended |
---|
9 | that contains a history of events kept within a ring buffer. Each |
---|
10 | entry will be the result of a conversion to double of the text |
---|
11 | written to the data file. Only if the new value has changed by a |
---|
12 | minimum amout it will be added to the ring buffer. |
---|
13 | - The command 'DColl/Log' writes the associated string to the log |
---|
14 | file specified in the configuration. |
---|
15 | |
---|
16 | Oliver Grimm, December 2009 |
---|
17 | |
---|
18 | \********************************************************************/ |
---|
19 | |
---|
20 | #define SERVER_NAME "DColl" |
---|
21 | |
---|
22 | #define DATE_ROLLOVER 12 // localtime hour after which next date is used |
---|
23 | |
---|
24 | #include "Evidence.h" |
---|
25 | |
---|
26 | #include <math.h> |
---|
27 | #include <float.h> |
---|
28 | #include <sys/stat.h> |
---|
29 | #include <ctype.h> |
---|
30 | #include <sys/types.h> |
---|
31 | #include <regex.h> |
---|
32 | |
---|
33 | // |
---|
34 | // Class declaration |
---|
35 | // |
---|
36 | class DataHandler: public DimClient, public DimBrowser, |
---|
37 | public EvidenceServer { |
---|
38 | |
---|
39 | struct Item { |
---|
40 | DimStampedInfo *DataItem; |
---|
41 | DimService *HistService; |
---|
42 | struct EvidenceHistoryItem *HistBuffer; |
---|
43 | int HistPointer; |
---|
44 | double LastValue; |
---|
45 | double MinAbsChange; |
---|
46 | } *List; |
---|
47 | |
---|
48 | DimCommand *LogCommand; |
---|
49 | |
---|
50 | unsigned int NumItems; |
---|
51 | FILE *DataFile; |
---|
52 | FILE *LogFile; |
---|
53 | float DataSizekB, LogSizekB; |
---|
54 | int DataSizeLastUpdate, LogSizeLastUpdate; |
---|
55 | char *DataDir; |
---|
56 | DimService *LogSizeService, *DataSizeService; |
---|
57 | int HistSize; |
---|
58 | int SizeUpdateDelay; |
---|
59 | int TimeForNextFile; |
---|
60 | |
---|
61 | int RegExCount; |
---|
62 | regex_t *RegEx; |
---|
63 | double *MinChange; |
---|
64 | |
---|
65 | void infoHandler(); |
---|
66 | void commandHandler(); |
---|
67 | void AddService(char *); |
---|
68 | float FileSize(FILE *); |
---|
69 | |
---|
70 | public: |
---|
71 | DataHandler(); |
---|
72 | ~DataHandler(); |
---|
73 | }; |
---|
74 | |
---|
75 | // |
---|
76 | // Constructor |
---|
77 | // |
---|
78 | DataHandler::DataHandler(): EvidenceServer(SERVER_NAME) { |
---|
79 | |
---|
80 | // Initialization to prevent freeing unallocated memory |
---|
81 | DataFile = NULL; |
---|
82 | LogFile = NULL; |
---|
83 | List = NULL; |
---|
84 | LogSizeService = NULL; |
---|
85 | DataSizeService = NULL; |
---|
86 | |
---|
87 | DataSizeLastUpdate = 0; |
---|
88 | LogSizeLastUpdate = 0; |
---|
89 | TimeForNextFile = 0; |
---|
90 | |
---|
91 | // Request configuration data |
---|
92 | char *Change = GetConfig(SERVER_NAME " minchange"); |
---|
93 | DataDir = GetConfig(SERVER_NAME " datadir"); |
---|
94 | char *Logname = GetConfig(SERVER_NAME " logfile"); |
---|
95 | SizeUpdateDelay = atoi(GetConfig(SERVER_NAME " sizeupdate")); |
---|
96 | HistSize = atoi(GetConfig(SERVER_NAME " histsize")); |
---|
97 | if (HistSize < 1) HistSize = 1; // Minimum one items |
---|
98 | |
---|
99 | // Open log file |
---|
100 | if ((LogFile = fopen(Logname, "a")) == NULL) { |
---|
101 | State(FATAL, "Could not open log file '%s' (%s)", Logname, strerror(errno)); |
---|
102 | } |
---|
103 | |
---|
104 | // Provide logging command |
---|
105 | LogCommand = new DimCommand("DColl/Log", (char *) "C", this); |
---|
106 | |
---|
107 | // Create services for file sizes |
---|
108 | DataSizekB = 0; |
---|
109 | DataSizeService = new DimService(SERVER_NAME "/DataSizekB", DataSizekB); |
---|
110 | |
---|
111 | LogSizekB = FileSize(LogFile); |
---|
112 | LogSizeService = new DimService(SERVER_NAME "/LogSizekB", LogSizekB); |
---|
113 | |
---|
114 | // Count how many minimum change value regular expressions are present |
---|
115 | RegExCount = 0; |
---|
116 | char *Token = strtok(Change, "\t "); |
---|
117 | while (Token != NULL) { |
---|
118 | RegExCount++; |
---|
119 | Token = strtok(NULL, "\t "); |
---|
120 | } |
---|
121 | |
---|
122 | // Allocate memory for regular expressions and minimum change values |
---|
123 | RegEx = new regex_t[RegExCount]; |
---|
124 | MinChange = new double [RegExCount]; |
---|
125 | |
---|
126 | // Compile regular expressions |
---|
127 | int Pos = 0; |
---|
128 | for (int i=0; i<RegExCount; i++) { |
---|
129 | int Len = strlen(Change+Pos) + 1; |
---|
130 | Token = strtok(Change + Pos, ": \t"); |
---|
131 | |
---|
132 | int Ret = regcomp(&RegEx[i], Token, REG_EXTENDED|REG_NOSUB); |
---|
133 | if (Ret != 0) { |
---|
134 | char ErrMsg[200]; |
---|
135 | regerror(Ret, &RegEx[i], ErrMsg, sizeof(ErrMsg)); |
---|
136 | State(WARN, "Error compiling regular expression '%s' (%s)", Token, ErrMsg); |
---|
137 | } |
---|
138 | else { |
---|
139 | if ((Token=strtok(NULL, "")) != NULL) MinChange[i] = atof(Token); |
---|
140 | else MinChange[i] = 0; |
---|
141 | } |
---|
142 | Pos += Len; |
---|
143 | } |
---|
144 | |
---|
145 | // Subscribe to list of servers at DIS_DNS |
---|
146 | AddService((char *) "DIS_DNS/SERVER_LIST"); |
---|
147 | |
---|
148 | DimClient::sendCommand("DColl/Log", SERVER_NAME" *** Logging started ***"); |
---|
149 | } |
---|
150 | |
---|
151 | // |
---|
152 | // Destructor: Close files and free memory |
---|
153 | // |
---|
154 | DataHandler::~DataHandler() { |
---|
155 | |
---|
156 | // Delete DIM services and command first so handlers and not called anymore |
---|
157 | for (int i=0; i<NumItems; i++) { |
---|
158 | delete List[i].HistService; |
---|
159 | delete List[i].DataItem; |
---|
160 | delete[] List[i].HistBuffer; |
---|
161 | } |
---|
162 | free(List); |
---|
163 | |
---|
164 | //delete LogSizeService; // These create segmentation faults?! |
---|
165 | //delete DataSizeService; |
---|
166 | |
---|
167 | delete LogCommand; |
---|
168 | |
---|
169 | // Close files |
---|
170 | if (LogFile != NULL) if (fclose(LogFile) != 0) { |
---|
171 | State(ERROR, "Could not close log file (%s)", strerror(errno)); |
---|
172 | } |
---|
173 | if (DataFile != NULL && fclose(DataFile) != 0) { |
---|
174 | State(ERROR, "Error: Could not close data file (%s)", strerror(errno)); |
---|
175 | } |
---|
176 | |
---|
177 | // Free memory for regular expressions handling |
---|
178 | for (int i=0; i<RegExCount; i++) { |
---|
179 | regfree(&RegEx[i]); |
---|
180 | } |
---|
181 | delete[] MinChange; |
---|
182 | delete[] RegEx; |
---|
183 | } |
---|
184 | |
---|
185 | // |
---|
186 | // Implementation of data handling |
---|
187 | // |
---|
188 | // DIM ensures infoHandler() is called serialized, therefore |
---|
189 | // no mutex is needed to serialize writing to the file |
---|
190 | void DataHandler::infoHandler() { |
---|
191 | |
---|
192 | DimInfo *Info = getInfo(); |
---|
193 | |
---|
194 | // Check if service available |
---|
195 | if (Info->getSize()==strlen(NO_LINK)+1 && strcmp(Info->getString(), NO_LINK)==0) return; |
---|
196 | |
---|
197 | // If service is DIS_DNS/SERVER_LIST, subscribe to all SERVICE_LIST services |
---|
198 | if (strcmp(Info->getName(), "DIS_DNS/SERVER_LIST") == 0) { |
---|
199 | char *Token = strtok(Info->getString(), "+-!|@"); |
---|
200 | while (Token != NULL) { |
---|
201 | char *Buf; |
---|
202 | if (MakeString(&Buf, "%s/SERVICE_LIST", Token) != -1) { |
---|
203 | AddService(Buf); |
---|
204 | free(Buf); |
---|
205 | } |
---|
206 | else State(ERROR, "MakeString() failed for server %s", Token); |
---|
207 | |
---|
208 | Token = strtok(NULL, "|"); |
---|
209 | Token = strtok(NULL, "+-!|@"); |
---|
210 | } |
---|
211 | return; |
---|
212 | } |
---|
213 | |
---|
214 | // If service is SERVICE_LIST of any server, scan all services. |
---|
215 | // Subscribe to all services (but not to commands and RPCs) |
---|
216 | if (strstr(Info->getName(), "/SERVICE_LIST") != NULL) { |
---|
217 | char *Name = strtok(Info->getString(), "+-!|"); |
---|
218 | while (Name != NULL) { |
---|
219 | char *Type = strtok(NULL, "\n"); |
---|
220 | if (Type == NULL) return; // for safety, should not happen |
---|
221 | if (strstr(Type, "|CMD")==NULL && strstr(Type, "|RPC")==NULL) { |
---|
222 | AddService(Name); |
---|
223 | } |
---|
224 | Name = strtok(NULL, "+-!|"); |
---|
225 | } |
---|
226 | return; |
---|
227 | } |
---|
228 | |
---|
229 | // If it is time to open new data file, close the current one |
---|
230 | if (time(NULL) >= TimeForNextFile) { |
---|
231 | if (DataFile != NULL && fclose(DataFile) != 0) { |
---|
232 | State(ERROR, "Error: Could not close data file (%s)", strerror(errno)); |
---|
233 | } |
---|
234 | DataFile = NULL; |
---|
235 | } |
---|
236 | |
---|
237 | // Open new data file if necessary |
---|
238 | if (DataFile == NULL) { |
---|
239 | time_t Time = time(NULL); |
---|
240 | struct tm *T = localtime(&Time); |
---|
241 | |
---|
242 | if(T->tm_hour >= DATE_ROLLOVER) T->tm_mday++; |
---|
243 | if (mktime(T) == -1) State(ERROR, "mktime() failed, check filename"); |
---|
244 | |
---|
245 | char *Filename; |
---|
246 | if (MakeString(&Filename, "%s/%d%02d%02d.slow", DataDir, T->tm_year+1900, T->tm_mon+1, T->tm_mday) == -1) State(FATAL, "Could not create filename, MakeString() failed"); |
---|
247 | if ((DataFile = fopen(Filename, "a")) == NULL) { |
---|
248 | State(FATAL, "Could not open data file '%s' (%s)", Filename, strerror(errno)); |
---|
249 | } |
---|
250 | else State(INFO, "Opened data file '%s'", Filename); |
---|
251 | free(Filename); |
---|
252 | |
---|
253 | // Calculate time for next file opening |
---|
254 | T->tm_sec = 0; |
---|
255 | T->tm_min = 0; |
---|
256 | T->tm_hour = DATE_ROLLOVER; |
---|
257 | TimeForNextFile = mktime(T); |
---|
258 | } |
---|
259 | |
---|
260 | // Identify index of service |
---|
261 | int Service; |
---|
262 | for (Service=0; Service<NumItems; Service++) if (Info == List[Service].DataItem) break; |
---|
263 | if (Service == NumItems) return; // Service not found |
---|
264 | |
---|
265 | // If negative value for absolute change, ignore this entry |
---|
266 | if (List[Service].MinAbsChange < 0) return; |
---|
267 | |
---|
268 | // Write data header |
---|
269 | time_t RawTime = Info->getTimestamp(); |
---|
270 | struct tm *TM = localtime(&RawTime); |
---|
271 | |
---|
272 | 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()); |
---|
273 | |
---|
274 | // Translate data into ASCII |
---|
275 | char *Text = EvidenceServer::ToString(Info); |
---|
276 | if (Text != NULL) { |
---|
277 | // Replace all control characters by white space |
---|
278 | for (int i=0; i<strlen(Text); i++) if (iscntrl(Text[i])) Text[i] = ' '; |
---|
279 | |
---|
280 | // Write to file |
---|
281 | fprintf(DataFile, "%s\n", Text); |
---|
282 | |
---|
283 | // Add to history buffer if change large enough |
---|
284 | if ((fabs(atof(Text)-List[Service].LastValue) > List[Service].MinAbsChange)) { |
---|
285 | List[Service].HistBuffer[List[Service].HistPointer].Seconds = Info->getTimestamp(); |
---|
286 | List[Service].HistBuffer[List[Service].HistPointer].Value = atof(Text); |
---|
287 | List[Service].HistService->updateService(); |
---|
288 | List[Service].HistPointer++; |
---|
289 | if (List[Service].HistPointer >= HistSize) List[Service].HistPointer = 0; |
---|
290 | List[Service].LastValue = atof(Text); |
---|
291 | } |
---|
292 | free(Text); |
---|
293 | } |
---|
294 | else fprintf(DataFile, "Cannot interpret format identifier\n"); |
---|
295 | |
---|
296 | fflush(DataFile); |
---|
297 | |
---|
298 | // Terminate if error because otherwise infinite loop might result as |
---|
299 | // next call to this infoHandler() will try to (re-)open file |
---|
300 | if(ferror(DataFile)) { |
---|
301 | fclose(DataFile); |
---|
302 | DataFile = NULL; |
---|
303 | State(FATAL, "Error writing to data file, closed file (%s)", strerror(errno)); |
---|
304 | } |
---|
305 | |
---|
306 | // Update datafile size service |
---|
307 | if (time(NULL) - DataSizeLastUpdate > SizeUpdateDelay) { |
---|
308 | DataSizekB = FileSize(DataFile); |
---|
309 | DataSizeService->updateService(); |
---|
310 | DataSizeLastUpdate = time(NULL); |
---|
311 | } |
---|
312 | } |
---|
313 | |
---|
314 | // |
---|
315 | // Implementation of log writing |
---|
316 | // |
---|
317 | void DataHandler::commandHandler() { |
---|
318 | |
---|
319 | if (getCommand() != LogCommand || LogFile == NULL) return; |
---|
320 | |
---|
321 | // Replace all carriage-return by line feed and non-printable characters |
---|
322 | char *Text = getCommand()->getString(); |
---|
323 | for (unsigned int i=0; i<strlen(Text); i++) { |
---|
324 | if (Text[i] == '\r') Text[i] = '\n'; |
---|
325 | if(isprint(Text[i])==0 && isspace(Text[i])==0) Text[i] = ' '; |
---|
326 | } |
---|
327 | |
---|
328 | time_t RawTime = time(NULL); |
---|
329 | struct tm *TM = localtime(&RawTime); |
---|
330 | |
---|
331 | fprintf(LogFile, "%d/%d/%d %d:%d:%d: %s\n", |
---|
332 | TM->tm_mday, TM->tm_mon+1, TM->tm_year+1900, |
---|
333 | TM->tm_hour, TM->tm_min, TM->tm_sec, Text); |
---|
334 | |
---|
335 | fflush(LogFile); |
---|
336 | |
---|
337 | // If error close file (otherwise infinite loop because State() also writes to log) |
---|
338 | if(ferror(LogFile)) { |
---|
339 | fclose(LogFile); |
---|
340 | LogFile = NULL; |
---|
341 | State(ERROR, "Error writing to log file, closing file (%s)", strerror(errno)); |
---|
342 | } |
---|
343 | |
---|
344 | // Update logfile size service |
---|
345 | if (time(NULL) - LogSizeLastUpdate > SizeUpdateDelay) { |
---|
346 | LogSizekB = FileSize(LogFile); |
---|
347 | LogSizeService->updateService(); |
---|
348 | LogSizeLastUpdate = time(NULL); |
---|
349 | } |
---|
350 | } |
---|
351 | |
---|
352 | |
---|
353 | // |
---|
354 | // Add service to watch list |
---|
355 | // |
---|
356 | void DataHandler::AddService(char *Name) { |
---|
357 | |
---|
358 | // Do not subscribe to history services (otherwise infinite loop) |
---|
359 | if (strstr(Name, ".hist") != NULL) return; |
---|
360 | |
---|
361 | // Check if already subscribed to this service |
---|
362 | for (int i=0; i<NumItems; i++) { |
---|
363 | if(strcmp(Name, List[i].DataItem->getName()) == 0) return; |
---|
364 | } |
---|
365 | |
---|
366 | // Increase capacity of item list |
---|
367 | struct Item *New = (struct Item *) realloc(List, (NumItems+1)*sizeof(struct Item)); |
---|
368 | if (New != NULL) List = New; |
---|
369 | else { |
---|
370 | State(ERROR, "Could not allocate memory for item list, service '' not added (%s)", Name, strerror(errno)); |
---|
371 | return; |
---|
372 | } |
---|
373 | |
---|
374 | // Set minimum required change by comparing to regular expressions |
---|
375 | List[NumItems].MinAbsChange = 0; |
---|
376 | for (int i=0; i<RegExCount; i++) { |
---|
377 | if (regexec(&RegEx[i], Name, (size_t) 0, NULL, 0) == 0) { |
---|
378 | List[NumItems].MinAbsChange = MinChange[i]; |
---|
379 | } |
---|
380 | } |
---|
381 | |
---|
382 | List[NumItems].LastValue = DBL_MAX; |
---|
383 | |
---|
384 | // Create history service |
---|
385 | List[NumItems].HistBuffer = new struct EvidenceHistoryItem [HistSize]; |
---|
386 | memset(List[NumItems].HistBuffer, 0, HistSize*sizeof(EvidenceHistoryItem)); |
---|
387 | List[NumItems].HistPointer = 0; |
---|
388 | |
---|
389 | char *Buf; |
---|
390 | if (MakeString(&Buf, "%s.hist", Name) == -1) { |
---|
391 | State(ERROR, "Could not create history service for '%s', MakeString() failed", Name); |
---|
392 | } |
---|
393 | else { |
---|
394 | List[NumItems].HistService = new DimService (Buf, (char *) "C", |
---|
395 | List[NumItems].HistBuffer, HistSize*sizeof(EvidenceHistoryItem)); |
---|
396 | free(Buf); |
---|
397 | } |
---|
398 | |
---|
399 | // Subscribe to service |
---|
400 | List[NumItems].DataItem = new DimStampedInfo(Name, NO_LINK, this); |
---|
401 | |
---|
402 | // Increase number only after all set-up |
---|
403 | NumItems++; |
---|
404 | } |
---|
405 | |
---|
406 | // |
---|
407 | // Determine size of file in kB |
---|
408 | // |
---|
409 | float DataHandler::FileSize(FILE *File) { |
---|
410 | |
---|
411 | struct stat FileStatus; |
---|
412 | |
---|
413 | if (fstat(fileno(File), &FileStatus) == -1) { |
---|
414 | State(WARN, "Could not determine size of file (%s)", strerror(errno)); |
---|
415 | return -1; |
---|
416 | } |
---|
417 | |
---|
418 | return (float) FileStatus.st_size/1024; |
---|
419 | } |
---|
420 | |
---|
421 | // |
---|
422 | // Main program |
---|
423 | // |
---|
424 | int main() { |
---|
425 | |
---|
426 | // Static ensures calling of destructor by exit() |
---|
427 | static DataHandler Data; |
---|
428 | |
---|
429 | // Sleep until signal caught |
---|
430 | pause(); |
---|
431 | } |
---|