networking/udhcp/dumpleases.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   4  */
   5 #include <getopt.h>
   6
   7 #include "common.h"
   8 #include "dhcpd.h"
   9
  10
  11 #define REMAINING 0
  12 #define ABSOLUTE 1
  13
  14 int dumpleases_main(int argc, char *argv[]);
  15 int dumpleases_main(int argc, char *argv[])
  16 {
  17         int fp;
  18         int i, c, mode = REMAINING;
  19         unsigned long expires;
  20         const char *file = LEASES_FILE;
  21         struct dhcpOfferedAddr lease;
  22         struct in_addr addr;
  23
  24         static const struct option options[] = {
  25                 {"absolute", 0, 0, 'a'},
  26                 {"remaining", 0, 0, 'r'},
  27                 {"file", 1, 0, 'f'},
  28                 {0, 0, 0, 0}
  29         };
  30
  31         while (1) {
  32                 int option_index = 0;
  33                 c = getopt_long(argc, argv, "arf:", options, &option_index);
  34                 if (c == -1) break;
  35
  36                 switch (c) {
  37                 case 'a': mode = ABSOLUTE; break;
  38                 case 'r': mode = REMAINING; break;
  39                 case 'f':
  40                         file = optarg;
  41                         break;
  42                 default:
  43                         bb_show_usage();
  44                 }
  45         }
  46
  47         fp = xopen(file, O_RDONLY);
  48
  49         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  50         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  51         while (full_read(fp, &lease, sizeof(lease)) == sizeof(lease)) {
  52                 printf(":%02x"+1, lease.chaddr[0]);
  53                 for (i = 1; i < 6; i++) {
  54                         printf(":%02x", lease.chaddr[i]);
  55                 }
  56                 addr.s_addr = lease.yiaddr;
  57                 printf(" %-15s ", inet_ntoa(addr));
  58                 expires = ntohl(lease.expires);
  59                 if (mode == REMAINING) {
  60                         if (!expires)
  61                                 printf("expired\n");
  62                         else {
  63                                 unsigned d, h, m;
  64                                 d = expires / (24*60*60); expires %= (24*60*60);
  65                                 h = expires / (60*60); expires %= (60*60);
  66                                 m = expires / 60; expires %= 60;
  67                                 if (d) printf("%u days ", d);
  68                                 printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
  69                         }
  70                 } else fputs(ctime(&expires), stdout);
  71         }
  72         /* close(fp); */
  73
  74         return 0;
  75 }