[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 4 | */
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[3232] | 5 |
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| 6 | //usage:#define dumpleases_trivial_usage
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[3621] | 7 | //usage: "[-r|-a] [-d] [-f LEASEFILE]"
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[3232] | 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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[3621] | 14 | //usage: "\n -d,--decimal Show time in seconds"
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[3232] | 15 | //usage: )
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| 16 | //usage: IF_NOT_LONG_OPTS(
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| 17 | //usage: "\n -f FILE Lease file"
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| 18 | //usage: "\n -r Show remaining time"
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| 19 | //usage: "\n -a Show expiration time"
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[3621] | 20 | //usage: "\n -d Show time in seconds"
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[3232] | 21 | //usage: )
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| 22 |
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[1765] | 23 | #include "common.h"
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[821] | 24 | #include "dhcpd.h"
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[2725] | 25 | #include "unicode.h"
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[821] | 26 |
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[2725] | 27 | int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 28 | int dumpleases_main(int argc UNUSED_PARAM, char **argv)
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[821] | 29 | {
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[1765] | 30 | int fd;
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| 31 | int i;
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| 32 | unsigned opt;
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[3621] | 33 | int64_t written_at, curr;
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[821] | 34 | const char *file = LEASES_FILE;
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[2725] | 35 | struct dyn_lease lease;
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[821] | 36 |
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[1765] | 37 | enum {
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[2725] | 38 | OPT_a = 0x1, // -a
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| 39 | OPT_r = 0x2, // -r
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| 40 | OPT_f = 0x4, // -f
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[3621] | 41 | OPT_d = 0x8, // -d
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[821] | 42 | };
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[2725] | 43 | #if ENABLE_LONG_OPTS
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[1765] | 44 | static const char dumpleases_longopts[] ALIGN1 =
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| 45 | "absolute\0" No_argument "a"
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| 46 | "remaining\0" No_argument "r"
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| 47 | "file\0" Required_argument "f"
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[3621] | 48 | "decimal\0" No_argument "d"
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[1765] | 49 | ;
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[821] | 50 |
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[1765] | 51 | applet_long_options = dumpleases_longopts;
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| 52 | #endif
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[2725] | 53 | init_unicode();
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| 54 |
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[1765] | 55 | opt_complementary = "=0:a--r:r--a";
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[3621] | 56 | opt = getopt32(argv, "arf:d", &file);
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[821] | 57 |
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[1765] | 58 | fd = xopen(file, O_RDONLY);
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[821] | 59 |
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[3621] | 60 | /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
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[2725] | 61 | /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
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[3621] | 62 | printf("Mac %-14s" "IP %-13s" "Host %-15s" "Expires %s\n",
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| 63 | "Address", "Address", "Name",
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| 64 | (opt & OPT_a) ? "at" : "in"
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| 65 | );
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[2725] | 66 |
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| 67 | xread(fd, &written_at, sizeof(written_at));
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| 68 | written_at = SWAP_BE64(written_at);
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| 69 | curr = time(NULL);
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| 70 | if (curr < written_at)
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| 71 | written_at = curr; /* lease file from future! :) */
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| 72 |
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[1765] | 73 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
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[3621] | 74 | struct in_addr addr;
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| 75 | int64_t expires_abs;
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| 76 |
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[2725] | 77 | const char *fmt = ":%02x" + 1;
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| 78 | for (i = 0; i < 6; i++) {
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| 79 | printf(fmt, lease.lease_mac[i]);
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| 80 | fmt = ":%02x";
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[821] | 81 | }
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[2725] | 82 | addr.s_addr = lease.lease_nip;
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| 83 | #if ENABLE_UNICODE_SUPPORT
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| 84 | {
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[3232] | 85 | char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
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[2725] | 86 | printf(" %-16s%s ", inet_ntoa(addr), uni_name);
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| 87 | free(uni_name);
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| 88 | }
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| 89 | #else
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| 90 | /* actually, 15+1 and 19+1, +1 is a space between columns */
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| 91 | /* lease.hostname is char[20] and is always NUL terminated */
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| 92 | printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
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| 93 | #endif
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| 94 | expires_abs = ntohl(lease.expires) + written_at;
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| 95 | if (expires_abs <= curr) {
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| 96 | puts("expired");
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| 97 | continue;
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| 98 | }
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[3621] | 99 | if (opt & OPT_d) {
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| 100 | /* -d: decimal time */
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| 101 | if (!(opt & OPT_a))
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| 102 | expires_abs -= curr;
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| 103 | printf("%llu\n", (unsigned long long) expires_abs);
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| 104 | continue;
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| 105 | }
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[1765] | 106 | if (!(opt & OPT_a)) { /* no -a */
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[2725] | 107 | unsigned d, h, m;
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| 108 | unsigned expires = expires_abs - curr;
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| 109 | d = expires / (24*60*60); expires %= (24*60*60);
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| 110 | h = expires / (60*60); expires %= (60*60);
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| 111 | m = expires / 60; expires %= 60;
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| 112 | if (d)
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| 113 | printf("%u days ", d);
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| 114 | printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
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| 115 | } else { /* -a */
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| 116 | time_t t = expires_abs;
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| 117 | fputs(ctime(&t), stdout);
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| 118 | }
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[821] | 119 | }
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[1765] | 120 | /* close(fd); */
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[821] | 121 |
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| 122 | return 0;
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| 123 | }
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