1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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4 | */
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5 | #include "common.h"
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6 | #include "dhcpd.h"
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7 | #include "unicode.h"
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8 |
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9 | int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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10 | int dumpleases_main(int argc UNUSED_PARAM, char **argv)
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11 | {
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12 | int fd;
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13 | int i;
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14 | unsigned opt;
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15 | int64_t written_at, curr, expires_abs;
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16 | const char *file = LEASES_FILE;
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17 | struct dyn_lease lease;
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18 | struct in_addr addr;
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19 |
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20 | enum {
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21 | OPT_a = 0x1, // -a
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22 | OPT_r = 0x2, // -r
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23 | OPT_f = 0x4, // -f
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24 | };
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25 | #if ENABLE_LONG_OPTS
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26 | static const char dumpleases_longopts[] ALIGN1 =
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27 | "absolute\0" No_argument "a"
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28 | "remaining\0" No_argument "r"
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29 | "file\0" Required_argument "f"
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30 | ;
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31 |
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32 | applet_long_options = dumpleases_longopts;
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33 | #endif
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34 | init_unicode();
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35 |
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36 | opt_complementary = "=0:a--r:r--a";
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37 | opt = getopt32(argv, "arf:", &file);
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38 |
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39 | fd = xopen(file, O_RDONLY);
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40 |
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41 | printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in");
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42 | /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
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43 | /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
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44 |
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45 | xread(fd, &written_at, sizeof(written_at));
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46 | written_at = SWAP_BE64(written_at);
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47 | curr = time(NULL);
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48 | if (curr < written_at)
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49 | written_at = curr; /* lease file from future! :) */
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50 |
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51 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
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52 | const char *fmt = ":%02x" + 1;
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53 | for (i = 0; i < 6; i++) {
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54 | printf(fmt, lease.lease_mac[i]);
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55 | fmt = ":%02x";
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56 | }
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57 | addr.s_addr = lease.lease_nip;
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58 | #if ENABLE_UNICODE_SUPPORT
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59 | {
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60 | char *uni_name = unicode_conv_to_printable_fixedwidth(NULL, lease.hostname, 19);
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61 | printf(" %-16s%s ", inet_ntoa(addr), uni_name);
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62 | free(uni_name);
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63 | }
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64 | #else
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65 | /* actually, 15+1 and 19+1, +1 is a space between columns */
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66 | /* lease.hostname is char[20] and is always NUL terminated */
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67 | printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
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68 | #endif
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69 | expires_abs = ntohl(lease.expires) + written_at;
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70 | if (expires_abs <= curr) {
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71 | puts("expired");
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72 | continue;
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73 | }
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74 | if (!(opt & OPT_a)) { /* no -a */
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75 | unsigned d, h, m;
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76 | unsigned expires = expires_abs - curr;
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77 | d = expires / (24*60*60); expires %= (24*60*60);
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78 | h = expires / (60*60); expires %= (60*60);
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79 | m = expires / 60; expires %= 60;
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80 | if (d)
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81 | printf("%u days ", d);
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82 | printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
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83 | } else { /* -a */
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84 | time_t t = expires_abs;
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85 | fputs(ctime(&t), stdout);
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86 | }
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87 | }
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88 | /* close(fd); */
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89 |
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90 | return 0;
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91 | }
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