| 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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