blob: 64cd73ec774638cdfbde3995ac4a2a7ea867960e
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
4 | */ |
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 | |
21 | #include "common.h" |
22 | #include "dhcpd.h" |
23 | #include "unicode.h" |
24 | |
25 | int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
26 | int dumpleases_main(int argc UNUSED_PARAM, char **argv) |
27 | { |
28 | int fd; |
29 | int i; |
30 | unsigned opt; |
31 | int64_t written_at, curr, expires_abs; |
32 | const char *file = LEASES_FILE; |
33 | struct dyn_lease lease; |
34 | struct in_addr addr; |
35 | |
36 | enum { |
37 | OPT_a = 0x1, // -a |
38 | OPT_r = 0x2, // -r |
39 | OPT_f = 0x4, // -f |
40 | }; |
41 | #if ENABLE_LONG_OPTS |
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 | ; |
47 | |
48 | applet_long_options = dumpleases_longopts; |
49 | #endif |
50 | init_unicode(); |
51 | |
52 | opt_complementary = "=0:a--r:r--a"; |
53 | opt = getopt32(argv, "arf:", &file); |
54 | |
55 | fd = xopen(file, O_RDONLY); |
56 | |
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 | |
67 | while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) { |
68 | const char *fmt = ":%02x" + 1; |
69 | for (i = 0; i < 6; i++) { |
70 | printf(fmt, lease.lease_mac[i]); |
71 | fmt = ":%02x"; |
72 | } |
73 | addr.s_addr = lease.lease_nip; |
74 | #if ENABLE_UNICODE_SUPPORT |
75 | { |
76 | char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19); |
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 | } |
90 | if (!(opt & OPT_a)) { /* no -a */ |
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 | } |
103 | } |
104 | /* close(fd); */ |
105 | |
106 | return 0; |
107 | } |
108 |