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 <fcntl.h>
   6 #include <string.h>
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <sys/wait.h>
  10 #include <arpa/inet.h>
  11 #include <netdb.h>
  12 #include <netinet/in.h>
  13 #include <stdio.h>
  14 #include <sys/socket.h>
  15 #include <unistd.h>
  16 #include <getopt.h>
  17 #include <time.h>
  18
  19 #include "dhcpd.h"
  20 #include "leases.h"
  21 #include "libbb_udhcp.h"
  22
  23 #define REMAINING 0
  24 #define ABSOLUTE 1
  25
  26 int dumpleases_main(int argc, char *argv[])
  27 {
  28         FILE *fp;
  29         int i, c, mode = REMAINING;
  30         long expires;
  31         const char *file = LEASES_FILE;
  32         struct dhcpOfferedAddr lease;
  33         struct in_addr addr;
  34
  35         static const struct option options[] = {
  36                 {"absolute", 0, 0, 'a'},
  37                 {"remaining", 0, 0, 'r'},
  38                 {"file", 1, 0, 'f'},
  39                 {0, 0, 0, 0}
  40         };
  41
  42         while (1) {
  43                 int option_index = 0;
  44                 c = getopt_long(argc, argv, "arf:", options, &option_index);
  45                 if (c == -1) break;
  46
  47                 switch (c) {
  48                 case 'a': mode = ABSOLUTE; break;
  49                 case 'r': mode = REMAINING; break;
  50                 case 'f':
  51                         file = optarg;
  52                         break;
  53                 default:
  54                         bb_show_usage();
  55                 }
  56         }
  57
  58         fp = xfopen(file, "r");
  59
  60         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  61         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  62         while (fread(&lease, sizeof(lease), 1, fp)) {
  63
  64                 for (i = 0; i < 6; i++) {
  65                         printf("%02x", lease.chaddr[i]);
  66                         if (i != 5) printf(":");
  67                 }
  68                 addr.s_addr = lease.yiaddr;
  69                 printf(" %-15s", inet_ntoa(addr));
  70                 expires = ntohl(lease.expires);
  71                 printf(" ");
  72                 if (mode == REMAINING) {
  73                         if (!expires) printf("expired\n");
  74                         else {
  75                                 if (expires > 60*60*24) {
  76                                         printf("%ld days, ", expires / (60*60*24));
  77                                         expires %= 60*60*24;
  78                                 }
  79                                 if (expires > 60*60) {
  80                                         printf("%ld hours, ", expires / (60*60));
  81                                         expires %= 60*60;
  82                                 }
  83                                 if (expires > 60) {
  84                                         printf("%ld minutes, ", expires / 60);
  85                                         expires %= 60;
  86                                 }
  87                                 printf("%ld seconds\n", expires);
  88                         }
  89                 } else printf("%s", ctime(&expires));
  90         }
  91         fclose(fp);
  92
  93         return 0;
  94 }