LXR busybox/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
   6#include "common.h"
   7#include "dhcpd.h"
   8
   9int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  10int dumpleases_main(int argc UNUSED_PARAM, char **argv)
  11{
  12        int fd;
  13        int i;
  14        unsigned opt;
  15        time_t expires;
  16        const char *file = LEASES_FILE;
  17        struct dhcpOfferedAddr lease;
  18        struct in_addr addr;
  19
  20        enum {
  21                OPT_a   = 0x1,  // -a
  22                OPT_r   = 0x2,  // -r
  23                OPT_f   = 0x4,  // -f
  24        };
  25#if ENABLE_GETOPT_LONG
  26        static const char dumpleases_longopts[] ALIGN1 =
  27                "absolute\0"  No_argument       "a"
  28                "remaining\0" No_argument       "r"
  29                "file\0"      Required_argument "f"
  30                ;
  31
  32        applet_long_options = dumpleases_longopts;
  33#endif
  34        opt_complementary = "=0:a--r:r--a";
  35        opt = getopt32(argv, "arf:", &file);
  36
  37        fd = xopen(file, O_RDONLY);
  38
  39        printf("Mac Address       IP-Address      Expires %s\n", (opt & OPT_a) ? "at" : "in");
  40        /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  41        while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
  42                printf(":%02x"+1, lease.chaddr[0]);
  43                for (i = 1; i < 6; i++) {
  44                        printf(":%02x", lease.chaddr[i]);
  45                }
  46                addr.s_addr = lease.yiaddr;
  47                printf(" %-15s ", inet_ntoa(addr));
  48                expires = ntohl(lease.expires);
  49                if (!(opt & OPT_a)) { /* no -a */
  50                        if (!expires)
  51                                puts("expired");
  52                        else {
  53                                unsigned d, h, m;
  54                                d = expires / (24*60*60); expires %= (24*60*60);
  55                                h = expires / (60*60); expires %= (60*60);
  56                                m = expires / 60; expires %= 60;
  57                                if (d) printf("%u days ", d);
  58                                printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
  59                        }
  60                } else /* -a */
  61                        fputs(ctime(&expires), stdout);
  62        }
  63        /* close(fd); */
  64
  65        return 0;
  66}
  67