source: branches/3.2/mindi-busybox/networking/udhcp/dumpleases.c @ 3232

Last change on this file since 3232 was 3232, checked in by Bruno Cornec, 7 years ago
  • Update mindi-busybox to 1.21.1
File size: 3.0 KB
Line 
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
25int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
26int 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}
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