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 int dumpleases_main(int argc, char **argv);
  11 int dumpleases_main(int argc, char **argv)
  12 {
  13         int fd;
  14         int i;
  15         unsigned opt;
  16         time_t expires;
  17         const char *file = LEASES_FILE;
  18         struct dhcpOfferedAddr lease;
  19         struct in_addr addr;
  20
  21         enum {
  22                 OPT_a   = 0x1,  // -a
  23                 OPT_r   = 0x2,  // -r
  24                 OPT_f   = 0x4,  // -f
  25         };
  26 #if ENABLE_GETOPT_LONG
  27         static const char dumpleases_longopts[] =
  28                 "absolute\0"  No_argument       "a"
  29                 "remaining\0" No_argument       "r"
  30                 "file\0"      Required_argument "f"
  31                 ;
  32
  33         applet_long_options = dumpleases_longopts;
  34 #endif
  35         opt_complementary = "=0:a--r:r--a";
  36         opt = getopt32(argc, argv, "arf:", &file);
  37
  38         fd = xopen(file, O_RDONLY);
  39
  40         printf("Mac Address       IP-Address      Expires %s\n", (opt & OPT_a) ? "at" : "in");
  41         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  42         while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
  43                 printf(":%02x"+1, lease.chaddr[0]);
  44                 for (i = 1; i < 6; i++) {
  45                         printf(":%02x", lease.chaddr[i]);
  46                 }
  47                 addr.s_addr = lease.yiaddr;
  48                 printf(" %-15s ", inet_ntoa(addr));
  49                 expires = ntohl(lease.expires);
  50                 if (!(opt & OPT_a)) { /* no -a */
  51                         if (!expires)
  52                                 puts("expired");
  53                         else {
  54                                 unsigned d, h, m;
  55                                 d = expires / (24*60*60); expires %= (24*60*60);
  56                                 h = expires / (60*60); expires %= (60*60);
  57                                 m = expires / 60; expires %= 60;
  58                                 if (d) printf("%u days ", d);
  59                                 printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
  60                         }
  61                 } else /* -a */
  62                         fputs(ctime(&expires), stdout);
  63         }
  64         /* close(fd); */
  65
  66         return 0;
  67 }