getopt32: remove applet_long_options
[oweals/busybox.git] / networking / udhcp / dumpleases.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
4  */
5 //applet:IF_DUMPLEASES(APPLET_NOEXEC(dumpleases, dumpleases, BB_DIR_USR_BIN, BB_SUID_DROP, dumpleases))
6
7 //kbuild:lib-$(CONFIG_DUMPLEASES) += dumpleases.o
8
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"
18 //usage:        )
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"
24 //usage:        )
25
26 #include "common.h"
27 #include "dhcpd.h"
28 #include "unicode.h"
29
30 int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
31 int dumpleases_main(int argc UNUSED_PARAM, char **argv)
32 {
33         int fd;
34         int i;
35         unsigned opt;
36         int64_t written_at, curr;
37         const char *file = LEASES_FILE;
38         struct dyn_lease lease;
39
40         enum {
41                 OPT_a = 0x1, // -a
42                 OPT_r = 0x2, // -r
43                 OPT_f = 0x4, // -f
44                 OPT_d = 0x8, // -d
45         };
46 #if ENABLE_LONG_OPTS
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"
52                 ;
53
54 #endif
55         init_unicode();
56
57         opt_complementary = "=0:a--r:r--a";
58         opt = getopt32long(argv, "arf:d", dumpleases_longopts, &file);
59
60         fd = xopen(file, O_RDONLY);
61
62         /*     "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
63         /*     "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
64         printf("Mac %-14s"       "IP %-13s"      "Host %-15s"        "Expires %s\n",
65                 "Address", "Address", "Name",
66                 (opt & OPT_a) ? "at" : "in"
67         );
68
69         xread(fd, &written_at, sizeof(written_at));
70         written_at = SWAP_BE64(written_at);
71         curr = time(NULL);
72         if (curr < written_at)
73                 written_at = curr; /* lease file from future! :) */
74
75         while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
76                 struct in_addr addr;
77                 int64_t expires_abs;
78
79                 const char *fmt = ":%02x" + 1;
80                 for (i = 0; i < 6; i++) {
81                         printf(fmt, lease.lease_mac[i]);
82                         fmt = ":%02x";
83                 }
84                 addr.s_addr = lease.lease_nip;
85 #if ENABLE_UNICODE_SUPPORT
86                 {
87                         char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
88                         printf(" %-16s%s ", inet_ntoa(addr), uni_name);
89                         free(uni_name);
90                 }
91 #else
92                 /* actually, 15+1 and 19+1, +1 is a space between columns */
93                 /* lease.hostname is char[20] and is always NUL terminated */
94                 printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
95 #endif
96                 expires_abs = ntohl(lease.expires) + written_at;
97                 if (expires_abs <= curr) {
98                         puts("expired");
99                         continue;
100                 }
101                 if (opt & OPT_d) {
102                         /* -d: decimal time */
103                         if (!(opt & OPT_a))
104                                 expires_abs -= curr;
105                         printf("%llu\n", (unsigned long long) expires_abs);
106                         continue;
107                 }
108                 if (!(opt & OPT_a)) { /* no -a */
109                         unsigned d, h, m;
110                         unsigned expires = expires_abs - curr;
111                         d = expires / (24*60*60); expires %= (24*60*60);
112                         h = expires / (60*60); expires %= (60*60);
113                         m = expires / 60; expires %= 60;
114                         if (d)
115                                 printf("%u days ", d);
116                         printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
117                 } else { /* -a */
118                         time_t t = expires_abs;
119                         fputs(ctime(&t), stdout);
120                 }
121         }
122         /* close(fd); */
123
124         return 0;
125 }