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
  27 #ifndef IN_BUSYBOX
  28 static void ATTRIBUTE_NORETURN show_usage(void)
  29 {
  30         printf(
  31 "Usage: dumpleases -f <file> -[r|a]\n\n"
  32 "  -f, --file=FILENAME             Leases file to load\n"
  33 "  -r, --remaining                 Interepret lease times as time remaining\n"
  34 "  -a, --absolute                  Interepret lease times as expire time\n");
  35         exit(0);
  36 }
  37 #else
  38 #define show_usage bb_show_usage
  39 #endif
  40
  41
  42 #ifdef IN_BUSYBOX
  43 int dumpleases_main(int argc, char *argv[])
  44 #else
  45 int main(int argc, char *argv[])
  46 #endif
  47 {
  48         FILE *fp;
  49         int i, c, mode = REMAINING;
  50         long expires;
  51         const char *file = LEASES_FILE;
  52         struct dhcpOfferedAddr lease;
  53         struct in_addr addr;
  54
  55         static const struct option options[] = {
  56                 {"absolute", 0, 0, 'a'},
  57                 {"remaining", 0, 0, 'r'},
  58                 {"file", 1, 0, 'f'},
  59                 {0, 0, 0, 0}
  60         };
  61
  62         while (1) {
  63                 int option_index = 0;
  64                 c = getopt_long(argc, argv, "arf:", options, &option_index);
  65                 if (c == -1) break;
  66
  67                 switch (c) {
  68                 case 'a': mode = ABSOLUTE; break;
  69                 case 'r': mode = REMAINING; break;
  70                 case 'f':
  71                         file = optarg;
  72                         break;
  73                 default:
  74                         show_usage();
  75                 }
  76         }
  77
  78         fp = xfopen(file, "r");
  79
  80         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  81         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  82         while (fread(&lease, sizeof(lease), 1, fp)) {
  83
  84                 for (i = 0; i < 6; i++) {
  85                         printf("%02x", lease.chaddr[i]);
  86                         if (i != 5) printf(":");
  87                 }
  88                 addr.s_addr = lease.yiaddr;
  89                 printf(" %-15s", inet_ntoa(addr));
  90                 expires = ntohl(lease.expires);
  91                 printf(" ");
  92                 if (mode == REMAINING) {
  93                         if (!expires) printf("expired\n");
  94                         else {
  95                                 if (expires > 60*60*24) {
  96                                         printf("%ld days, ", expires / (60*60*24));
  97                                         expires %= 60*60*24;
  98                                 }
  99                                 if (expires > 60*60) {
 100                                         printf("%ld hours, ", expires / (60*60));
 101                                         expires %= 60*60;
 102                                 }
 103                                 if (expires > 60) {
 104                                         printf("%ld minutes, ", expires / 60);
 105                                         expires %= 60;
 106                                 }
 107                                 printf("%ld seconds\n", expires);
 108                         }
 109                 } else printf("%s", ctime(&expires));
 110         }
 111         fclose(fp);
 112
 113         return 0;
 114 }