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 |
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6 | //usage:#define dumpleases_trivial_usage
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7 | //usage: "[-r|-a] [-f LEASEFILE]"
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8 | //usage:#define dumpleases_full_usage "\n\n"
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9 | //usage: "Display DHCP leases granted by udhcpd\n"
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10 | //usage: IF_LONG_OPTS(
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11 | //usage: "\n -f,--file=FILE Lease file"
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12 | //usage: "\n -r,--remaining Show remaining time"
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13 | //usage: "\n -a,--absolute Show expiration time"
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14 | //usage: )
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15 | //usage: IF_NOT_LONG_OPTS(
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16 | //usage: "\n -f FILE Lease file"
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17 | //usage: "\n -r Show remaining time"
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18 | //usage: "\n -a Show expiration time"
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19 | //usage: )
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20 |
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21 | #include "common.h"
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22 | #include "dhcpd.h"
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23 | #include "unicode.h"
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24 |
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25 | int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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26 | int dumpleases_main(int argc UNUSED_PARAM, char **argv)
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27 | {
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28 | int fd;
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29 | int i;
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30 | unsigned opt;
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31 | int64_t written_at, curr, expires_abs;
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32 | const char *file = LEASES_FILE;
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33 | struct dyn_lease lease;
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34 | struct in_addr addr;
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35 |
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36 | enum {
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37 | OPT_a = 0x1, // -a
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38 | OPT_r = 0x2, // -r
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39 | OPT_f = 0x4, // -f
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40 | };
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41 | #if ENABLE_LONG_OPTS
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42 | static const char dumpleases_longopts[] ALIGN1 =
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43 | "absolute\0" No_argument "a"
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44 | "remaining\0" No_argument "r"
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45 | "file\0" Required_argument "f"
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46 | ;
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47 |
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48 | applet_long_options = dumpleases_longopts;
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49 | #endif
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50 | init_unicode();
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51 |
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52 | opt_complementary = "=0:a--r:r--a";
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53 | opt = getopt32(argv, "arf:", &file);
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54 |
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55 | fd = xopen(file, O_RDONLY);
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56 |
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57 | printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in");
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58 | /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
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59 | /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
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60 |
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61 | xread(fd, &written_at, sizeof(written_at));
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62 | written_at = SWAP_BE64(written_at);
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63 | curr = time(NULL);
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64 | if (curr < written_at)
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65 | written_at = curr; /* lease file from future! :) */
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66 |
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67 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
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68 | const char *fmt = ":%02x" + 1;
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69 | for (i = 0; i < 6; i++) {
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70 | printf(fmt, lease.lease_mac[i]);
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71 | fmt = ":%02x";
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72 | }
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73 | addr.s_addr = lease.lease_nip;
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74 | #if ENABLE_UNICODE_SUPPORT
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75 | {
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76 | char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
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77 | printf(" %-16s%s ", inet_ntoa(addr), uni_name);
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78 | free(uni_name);
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79 | }
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80 | #else
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81 | /* actually, 15+1 and 19+1, +1 is a space between columns */
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82 | /* lease.hostname is char[20] and is always NUL terminated */
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83 | printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
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84 | #endif
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85 | expires_abs = ntohl(lease.expires) + written_at;
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86 | if (expires_abs <= curr) {
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87 | puts("expired");
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88 | continue;
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89 | }
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90 | if (!(opt & OPT_a)) { /* no -a */
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91 | unsigned d, h, m;
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92 | unsigned expires = expires_abs - curr;
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93 | d = expires / (24*60*60); expires %= (24*60*60);
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94 | h = expires / (60*60); expires %= (60*60);
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95 | m = expires / 60; expires %= 60;
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96 | if (d)
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97 | printf("%u days ", d);
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98 | printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
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99 | } else { /* -a */
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100 | time_t t = expires_abs;
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101 | fputs(ctime(&t), stdout);
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102 | }
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103 | }
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104 | /* close(fd); */
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105 |
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106 | return 0;
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107 | }
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