networking/udhcp/dumpleases.c

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