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https://github.com/sheumann/hush.git
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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "common.h"
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#include "dhcpd.h"
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#include "unicode.h"
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#if BB_LITTLE_ENDIAN
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static inline uint64_t hton64(uint64_t v)
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{
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return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32);
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}
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#else
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#define hton64(v) (v)
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#endif
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#define ntoh64(v) hton64(v)
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int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int dumpleases_main(int argc UNUSED_PARAM, char **argv)
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{
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int fd;
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int i;
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unsigned opt;
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int64_t written_at, curr, expires_abs;
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const char *file = LEASES_FILE;
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struct dyn_lease lease;
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struct in_addr addr;
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enum {
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OPT_a = 0x1, // -a
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OPT_r = 0x2, // -r
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OPT_f = 0x4, // -f
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};
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#if ENABLE_LONG_OPTS
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static const char dumpleases_longopts[] ALIGN1 =
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"absolute\0" No_argument "a"
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"remaining\0" No_argument "r"
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"file\0" Required_argument "f"
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;
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applet_long_options = dumpleases_longopts;
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#endif
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init_unicode();
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opt_complementary = "=0:a--r:r--a";
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opt = getopt32(argv, "arf:", &file);
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fd = xopen(file, O_RDONLY);
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printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in");
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/* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
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/* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
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if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at))
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return 0;
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written_at = ntoh64(written_at);
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curr = time(NULL);
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if (curr < written_at)
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written_at = curr; /* lease file from future! :) */
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while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
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const char *fmt = ":%02x" + 1;
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for (i = 0; i < 6; i++) {
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printf(fmt, lease.lease_mac[i]);
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fmt = ":%02x";
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}
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addr.s_addr = lease.lease_nip;
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/* actually, 15+1 and 19+1, +1 is a space between columns */
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/* lease.hostname is char[20] and is always NUL terminated */
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#if ENABLE_FEATURE_ASSUME_UNICODE
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{
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char *uni_name = unicode_conv_to_printable_fixedwidth(NULL, lease.hostname, 20);
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printf(" %-16s%s", inet_ntoa(addr), uni_name);
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free(uni_name);
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}
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#else
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printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
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#endif
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expires_abs = ntohl(lease.expires) + written_at;
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if (expires_abs <= curr) {
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puts("expired");
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continue;
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}
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if (!(opt & OPT_a)) { /* no -a */
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unsigned d, h, m;
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unsigned expires = expires_abs - curr;
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d = expires / (24*60*60); expires %= (24*60*60);
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h = expires / (60*60); expires %= (60*60);
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m = expires / 60; expires %= 60;
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if (d)
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printf("%u days ", d);
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printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
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} else { /* -a */
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time_t t = expires_abs;
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fputs(ctime(&t), stdout);
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}
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}
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/* close(fd); */
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return 0;
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}
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