| /* 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; |
| } |