Lab3

lab3/lab3_1.c

@@ -0,0 +1,124 @@
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define MAX_LENGHT 4200
+
+typedef struct {
+  char remote_address[2048];
+  char local_time[32];
+  char request[2048];
+  int status;
+  int bytes_send;
+} Log;
+
+FILE *file;
+void readParams(int argc, char *argv[]) {
+  if (argv[1] != NULL) {
+    file = fopen(argv[1], "r");
+    if (file == NULL) {
+      printf("%s\n", "File doesn't exist.");
+      exit(1);
+    }
+  } else {
+    printf("%s\n", "Error in argument.");
+    exit(1);
+  }
+}
+
+int countSeconds(FILE *file) {
+  int countOfStr = 1;
+  char c = fgetc(file);
+  while (c != EOF) {
+    if (c == '\n') countOfStr++;
+    c = fgetc(file);
+  }
+
+  return countOfStr;
+}
+
+void program()  {
+  int *secondsArr;
+  int n = 0, months, timeWindow;
+  char allMonths[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+  printf("Enter interval (in seconds)\n");
+  scanf("%d", &timeWindow);
+
+  int countOfStr = countSeconds(file);
+  secondsArr = (int *) malloc(sizeof(int) * countOfStr);
+
+  fseek(file, 0, SEEK_SET);
+  char month[4];
+  struct tm time;
+  Log log;
+
+  int number = 0, errorsCount = 0;
+  while (!feof(file)) {
+    fscanf(file, "%s - - [%[^]]] \"%[^\"]\" %d %d", log.remote_address, log.local_time, log.request, &log.status, &log.bytes_send);
+
+    log.status /= 100;
+    if (log.status == 5) {
+      number++;
+      printf("%d) %s %d\n", number, log.request, errorsCount);
+      errorsCount = errorsCount + 1;
+    }
+
+    sscanf(log.local_time, "%d/%3s/%d:%d:%d:%d", &time.tm_mday, month,
+    &time.tm_year, &time.tm_hour, &time.tm_min, &time.tm_sec);
+    time.tm_year -= 1900;
+
+    for (int i = 0; i < 12; i++) {
+      if (allMonths[i] == month) {
+        months = i;
+        break;
+      }
+    }
+
+    time.tm_mon = months;
+    secondsArr[n] = mktime(&time);
+    n++;
+  }
+
+  // max time window
+  int temp = 0, count = 1, requests = 0, j = 1, begin, end;
+  for (int i = 1; i < countOfStr; i++) {
+    temp += secondsArr[i] - secondsArr[i - 1];
+    count++;
+    while (temp > timeWindow && j + 1 < countOfStr
+) {
+      temp -= (secondsArr[j] - secondsArr[j - 1]);
+      j++;
+      count--;
+    }
+    if (count > requests) {
+      requests = count;
+      begin = i;
+      end = j;
+    }
+  }
+
+  fseek(file, 0, SEEK_SET);
+
+  char interval_start[32], interval_end[32];
+  char *buf = malloc(MAX_LENGHT);
+  for (int i = 0; i < countOfStr; i++) {
+    fgets(buf, MAX_LENGHT, file);
+    if (i == begin) {
+      sscanf(buf, "%*s - - [%s]", interval_start);
+    }
+    if (i == end)  {  
+      sscanf(buf, "%*s - - [%s]", interval_end);
+    }
+  }
+
+  printf("\n5xx errors count: %d\n", errorsCount);
+  printf("\nMax requests in %d seconds window: %d \n", timeWindow, requests);
+  printf("%s to %s\n", interval_start, interval_end);
+}
+
+int main(int argc, char *argv[]) {
+  readParams(argc, argv);
+  program();
+  return 0;
+}