1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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"
11 //usage: IF_LONG_OPTS(
12 //usage: "\n -f,--file=FILE Lease file"
13 //usage: "\n -r,--remaining Show remaining time"
14 //usage: "\n -a,--absolute Show expiration time"
16 //usage: IF_NOT_LONG_OPTS(
17 //usage: "\n -f FILE Lease file"
18 //usage: "\n -r Show remaining time"
19 //usage: "\n -a Show expiration time"
26 int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
27 int dumpleases_main(int argc UNUSED_PARAM, char **argv)
32 int64_t written_at, curr, expires_abs;
33 const char *file = LEASES_FILE;
34 struct dyn_lease lease;
43 static const char dumpleases_longopts[] ALIGN1 =
44 "absolute\0" No_argument "a"
45 "remaining\0" No_argument "r"
46 "file\0" Required_argument "f"
49 applet_long_options = dumpleases_longopts;
53 opt_complementary = "=0:a--r:r--a";
54 opt = getopt32(argv, "arf:", &file);
56 fd = xopen(file, O_RDONLY);
58 printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in");
59 /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
60 /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
62 xread(fd, &written_at, sizeof(written_at));
63 written_at = SWAP_BE64(written_at);
65 if (curr < written_at)
66 written_at = curr; /* lease file from future! :) */
68 while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
69 const char *fmt = ":%02x" + 1;
70 for (i = 0; i < 6; i++) {
71 printf(fmt, lease.lease_mac[i]);
74 addr.s_addr = lease.lease_nip;
75 #if ENABLE_UNICODE_SUPPORT
77 char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
78 printf(" %-16s%s ", inet_ntoa(addr), uni_name);
82 /* actually, 15+1 and 19+1, +1 is a space between columns */
83 /* lease.hostname is char[20] and is always NUL terminated */
84 printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
86 expires_abs = ntohl(lease.expires) + written_at;
87 if (expires_abs <= curr) {
91 if (!(opt & OPT_a)) { /* no -a */
93 unsigned expires = expires_abs - curr;
94 d = expires / (24*60*60); expires %= (24*60*60);
95 h = expires / (60*60); expires %= (60*60);
96 m = expires / 60; expires %= 60;
98 printf("%u days ", d);
99 printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
101 time_t t = expires_abs;
102 fputs(ctime(&t), stdout);