/* vi: set sw=4 ts=4: */ /* * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ #include "common.h" #include "dhcpd.h" #if BB_LITTLE_ENDIAN static inline uint64_t hton64(uint64_t v) { return (((uint64_t)htonl(v)) << 32) | htonl(v >> 32); } #else #define hton64(v) (v) #endif #define ntoh64(v) hton64(v) int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int dumpleases_main(int argc UNUSED_PARAM, char **argv) { int fd; int i; unsigned opt; int64_t written_at, curr, expires_abs; const char *file = LEASES_FILE; struct dhcpOfferedAddr lease; struct in_addr addr; enum { OPT_a = 0x1, // -a OPT_r = 0x2, // -r OPT_f = 0x4, // -f }; #if ENABLE_GETOPT_LONG static const char dumpleases_longopts[] ALIGN1 = "absolute\0" No_argument "a" "remaining\0" No_argument "r" "file\0" Required_argument "f" ; applet_long_options = dumpleases_longopts; #endif opt_complementary = "=0:a--r:r--a"; opt = getopt32(argv, "arf:", &file); fd = xopen(file, O_RDONLY); printf("Mac Address IP Address Host Name Expires %s\n", (opt & OPT_a) ? "at" : "in"); /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */ /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */ if (full_read(fd, &written_at, sizeof(written_at)) != sizeof(written_at)) return 0; written_at = ntoh64(written_at); curr = time(NULL); if (curr < written_at) written_at = curr; /* lease file from future! :) */ while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) { const char *fmt = ":%02x" + 1; for (i = 0; i < 6; i++) { printf(fmt, lease.lease_mac16[i]); fmt = ":%02x"; } addr.s_addr = lease.lease_nip; /* actually, 15+1 and 19+1, +1 is a space between columns */ /* lease.hostname is char[20] and is always NUL terminated */ printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname); expires_abs = ntohl(lease.expires) + written_at; if (expires_abs <= curr) { puts("expired"); continue; } if (!(opt & OPT_a)) { /* no -a */ unsigned d, h, m; unsigned expires = expires_abs - curr; d = expires / (24*60*60); expires %= (24*60*60); h = expires / (60*60); expires %= (60*60); m = expires / 60; expires %= 60; if (d) printf("%u days ", d); printf("%02u:%02u:%02u\n", h, m, (unsigned)expires); } else { /* -a */ time_t t = expires_abs; fputs(ctime(&t), stdout); } } /* close(fd); */ return 0; }