[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[821] | 4 | */
|
---|
[3232] | 5 |
|
---|
| 6 | //usage:#define dumpleases_trivial_usage
|
---|
| 7 | //usage: "[-r|-a] [-f LEASEFILE]"
|
---|
| 8 | //usage:#define dumpleases_full_usage "\n\n"
|
---|
| 9 | //usage: "Display DHCP leases granted by udhcpd\n"
|
---|
| 10 | //usage: IF_LONG_OPTS(
|
---|
| 11 | //usage: "\n -f,--file=FILE Lease file"
|
---|
| 12 | //usage: "\n -r,--remaining Show remaining time"
|
---|
| 13 | //usage: "\n -a,--absolute Show expiration time"
|
---|
| 14 | //usage: )
|
---|
| 15 | //usage: IF_NOT_LONG_OPTS(
|
---|
| 16 | //usage: "\n -f FILE Lease file"
|
---|
| 17 | //usage: "\n -r Show remaining time"
|
---|
| 18 | //usage: "\n -a Show expiration time"
|
---|
| 19 | //usage: )
|
---|
| 20 |
|
---|
[1765] | 21 | #include "common.h"
|
---|
[821] | 22 | #include "dhcpd.h"
|
---|
[2725] | 23 | #include "unicode.h"
|
---|
[821] | 24 |
|
---|
[2725] | 25 | int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 26 | int dumpleases_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 27 | {
|
---|
[1765] | 28 | int fd;
|
---|
| 29 | int i;
|
---|
| 30 | unsigned opt;
|
---|
[2725] | 31 | int64_t written_at, curr, expires_abs;
|
---|
[821] | 32 | const char *file = LEASES_FILE;
|
---|
[2725] | 33 | struct dyn_lease lease;
|
---|
[821] | 34 | struct in_addr addr;
|
---|
| 35 |
|
---|
[1765] | 36 | enum {
|
---|
[2725] | 37 | OPT_a = 0x1, // -a
|
---|
| 38 | OPT_r = 0x2, // -r
|
---|
| 39 | OPT_f = 0x4, // -f
|
---|
[821] | 40 | };
|
---|
[2725] | 41 | #if ENABLE_LONG_OPTS
|
---|
[1765] | 42 | static const char dumpleases_longopts[] ALIGN1 =
|
---|
| 43 | "absolute\0" No_argument "a"
|
---|
| 44 | "remaining\0" No_argument "r"
|
---|
| 45 | "file\0" Required_argument "f"
|
---|
| 46 | ;
|
---|
[821] | 47 |
|
---|
[1765] | 48 | applet_long_options = dumpleases_longopts;
|
---|
| 49 | #endif
|
---|
[2725] | 50 | init_unicode();
|
---|
| 51 |
|
---|
[1765] | 52 | opt_complementary = "=0:a--r:r--a";
|
---|
| 53 | opt = getopt32(argv, "arf:", &file);
|
---|
[821] | 54 |
|
---|
[1765] | 55 | fd = xopen(file, O_RDONLY);
|
---|
[821] | 56 |
|
---|
[2725] | 57 | printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in");
|
---|
| 58 | /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
|
---|
| 59 | /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
|
---|
| 60 |
|
---|
| 61 | xread(fd, &written_at, sizeof(written_at));
|
---|
| 62 | written_at = SWAP_BE64(written_at);
|
---|
| 63 | curr = time(NULL);
|
---|
| 64 | if (curr < written_at)
|
---|
| 65 | written_at = curr; /* lease file from future! :) */
|
---|
| 66 |
|
---|
[1765] | 67 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
|
---|
[2725] | 68 | const char *fmt = ":%02x" + 1;
|
---|
| 69 | for (i = 0; i < 6; i++) {
|
---|
| 70 | printf(fmt, lease.lease_mac[i]);
|
---|
| 71 | fmt = ":%02x";
|
---|
[821] | 72 | }
|
---|
[2725] | 73 | addr.s_addr = lease.lease_nip;
|
---|
| 74 | #if ENABLE_UNICODE_SUPPORT
|
---|
| 75 | {
|
---|
[3232] | 76 | char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
|
---|
[2725] | 77 | printf(" %-16s%s ", inet_ntoa(addr), uni_name);
|
---|
| 78 | free(uni_name);
|
---|
| 79 | }
|
---|
| 80 | #else
|
---|
| 81 | /* actually, 15+1 and 19+1, +1 is a space between columns */
|
---|
| 82 | /* lease.hostname is char[20] and is always NUL terminated */
|
---|
| 83 | printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
|
---|
| 84 | #endif
|
---|
| 85 | expires_abs = ntohl(lease.expires) + written_at;
|
---|
| 86 | if (expires_abs <= curr) {
|
---|
| 87 | puts("expired");
|
---|
| 88 | continue;
|
---|
| 89 | }
|
---|
[1765] | 90 | if (!(opt & OPT_a)) { /* no -a */
|
---|
[2725] | 91 | unsigned d, h, m;
|
---|
| 92 | unsigned expires = expires_abs - curr;
|
---|
| 93 | d = expires / (24*60*60); expires %= (24*60*60);
|
---|
| 94 | h = expires / (60*60); expires %= (60*60);
|
---|
| 95 | m = expires / 60; expires %= 60;
|
---|
| 96 | if (d)
|
---|
| 97 | printf("%u days ", d);
|
---|
| 98 | printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
|
---|
| 99 | } else { /* -a */
|
---|
| 100 | time_t t = expires_abs;
|
---|
| 101 | fputs(ctime(&t), stdout);
|
---|
| 102 | }
|
---|
[821] | 103 | }
|
---|
[1765] | 104 | /* close(fd); */
|
---|
[821] | 105 |
|
---|
| 106 | return 0;
|
---|
| 107 | }
|
---|