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dumpleases.c

#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
#include <getopt.h>
#include <time.h>

#include "dhcpd.h"
#include "leases.h"
#include "libbb_udhcp.h"

#define REMAINING 0
#define ABSOLUTE 1


#ifndef IN_BUSYBOX
static void __attribute__ ((noreturn)) show_usage(void)
{
      printf(
"Usage: dumpleases -f <file> -[r|a]\n\n"
"  -f, --file=FILENAME             Leases file to load\n"
"  -r, --remaining                 Interepret lease times as time remaing\n"
"  -a, --absolute                  Interepret lease times as expire time\n");
      exit(0);
}
#else
#define show_usage bb_show_usage
#endif


#ifdef IN_BUSYBOX
int dumpleases_main(int argc, char *argv[])
#else
int main(int argc, char *argv[])
#endif
{
      FILE *fp;
      int i, c, mode = REMAINING;
      long expires;
      const char *file = LEASES_FILE;
      struct dhcpOfferedAddr lease;
      struct in_addr addr;

      static const struct option options[] = {
            {"absolute", 0, 0, 'a'},
            {"remaining", 0, 0, 'r'},
            {"file", 1, 0, 'f'},
            {0, 0, 0, 0}
      };

      while (1) {
            int option_index = 0;
            c = getopt_long(argc, argv, "arf:", options, &option_index);
            if (c == -1) break;

            switch (c) {
            case 'a': mode = ABSOLUTE; break;
            case 'r': mode = REMAINING; break;
            case 'f':
                  file = optarg;
                  break;
            default:
                  show_usage();
            }
      }

      fp = xfopen(file, "r");

      printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
      /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
      while (fread(&lease, sizeof(lease), 1, fp)) {

            for (i = 0; i < 6; i++) {
                  printf("%02x", lease.chaddr[i]);
                  if (i != 5) printf(":");
            }
            addr.s_addr = lease.yiaddr;
            printf(" %-15s", inet_ntoa(addr));
            expires = ntohl(lease.expires);
            printf(" ");
            if (mode == REMAINING) {
                  if (!expires) printf("expired\n");
                  else {
                        if (expires > 60*60*24) {
                              printf("%ld days, ", expires / (60*60*24));
                              expires %= 60*60*24;
                        }
                        if (expires > 60*60) {
                              printf("%ld hours, ", expires / (60*60));
                              expires %= 60*60;
                        }
                        if (expires > 60) {
                              printf("%ld minutes, ", expires / 60);
                              expires %= 60;
                        }
                        printf("%ld seconds\n", expires);
                  }
            } else printf("%s", ctime(&expires));
      }
      fclose(fp);

      return 0;
}

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