1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
5 //applet:IF_DUMPLEASES(APPLET_NOEXEC(dumpleases, dumpleases, BB_DIR_USR_BIN, BB_SUID_DROP, dumpleases))
7 //kbuild:lib-$(CONFIG_DUMPLEASES) += dumpleases.o
9 //usage:#define dumpleases_trivial_usage
10 //usage: "[-r|-a] [-d] [-f LEASEFILE]"
11 //usage:#define dumpleases_full_usage "\n\n"
12 //usage: "Display DHCP leases granted by udhcpd\n"
13 //usage: IF_LONG_OPTS(
14 //usage: "\n -f,--file FILE Lease file"
15 //usage: "\n -r,--remaining Show remaining time"
16 //usage: "\n -a,--absolute Show expiration time"
17 //usage: "\n -d,--decimal Show time in seconds"
19 //usage: IF_NOT_LONG_OPTS(
20 //usage: "\n -f FILE Lease file"
21 //usage: "\n -r Show remaining time"
22 //usage: "\n -a Show expiration time"
23 //usage: "\n -d Show time in seconds"
30 int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
31 int dumpleases_main(int argc UNUSED_PARAM, char **argv)
36 int64_t written_at, curr;
37 const char *file = LEASES_FILE;
38 struct dyn_lease lease;
47 static const char dumpleases_longopts[] ALIGN1 =
48 "absolute\0" No_argument "a"
49 "remaining\0" No_argument "r"
50 "file\0" Required_argument "f"
51 "decimal\0" No_argument "d"
57 opt = getopt32long(argv, "^"
64 fd = xopen(file, O_RDONLY);
66 /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
67 /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
68 printf("Mac %-14s" "IP %-13s" "Host %-15s" "Expires %s\n",
69 "Address", "Address", "Name",
70 (opt & OPT_a) ? "at" : "in"
73 xread(fd, &written_at, sizeof(written_at));
74 written_at = SWAP_BE64(written_at);
76 if (curr < written_at)
77 written_at = curr; /* lease file from future! :) */
79 while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
83 const char *fmt = ":%02x" + 1;
84 for (i = 0; i < 6; i++) {
85 printf(fmt, lease.lease_mac[i]);
88 addr.s_addr = lease.lease_nip;
89 #if ENABLE_UNICODE_SUPPORT
91 char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
92 printf(" %-16s%s ", inet_ntoa(addr), uni_name);
96 /* actually, 15+1 and 19+1, +1 is a space between columns */
97 /* lease.hostname is char[20] and is always NUL terminated */
98 printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
100 expires_abs = ntohl(lease.expires) + written_at;
101 if (expires_abs <= curr) {
106 /* -d: decimal time */
109 printf("%llu\n", (unsigned long long) expires_abs);
112 if (!(opt & OPT_a)) { /* no -a */
114 unsigned expires = expires_abs - curr;
115 d = expires / (24*60*60); expires %= (24*60*60);
116 h = expires / (60*60); expires %= (60*60);
117 m = expires / 60; expires %= 60;
119 printf("%u days ", d);
120 printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
122 time_t t = expires_abs;
123 fputs(ctime(&t), stdout);