/* vi: set sw=4 ts=4: */ /* * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //applet:IF_DUMPLEASES(APPLET_NOEXEC(dumpleases, dumpleases, BB_DIR_USR_BIN, BB_SUID_DROP, dumpleases)) //kbuild:lib-$(CONFIG_DUMPLEASES) += dumpleases.o //usage:#define dumpleases_trivial_usage //usage: "[-r|-a] [-d] [-f LEASEFILE]" //usage:#define dumpleases_full_usage "\n\n" //usage: "Display DHCP leases granted by udhcpd\n" //usage: IF_LONG_OPTS( //usage: "\n -f,--file FILE Lease file" //usage: "\n -r,--remaining Show remaining time" //usage: "\n -a,--absolute Show expiration time" //usage: "\n -d,--decimal Show time in seconds" //usage: ) //usage: IF_NOT_LONG_OPTS( //usage: "\n -f FILE Lease file" //usage: "\n -r Show remaining time" //usage: "\n -a Show expiration time" //usage: "\n -d Show time in seconds" //usage: ) #include "common.h" #include "dhcpd.h" #include "unicode.h" 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; const char *file = LEASES_FILE; struct dyn_lease lease; enum { OPT_a = 0x1, // -a OPT_r = 0x2, // -r OPT_f = 0x4, // -f OPT_d = 0x8, // -d }; #if ENABLE_LONG_OPTS static const char dumpleases_longopts[] ALIGN1 = "absolute\0" No_argument "a" "remaining\0" No_argument "r" "file\0" Required_argument "f" "decimal\0" No_argument "d" ; #endif init_unicode(); opt_complementary = "=0:a--r:r--a"; opt = getopt32long(argv, "arf:d", dumpleases_longopts, &file); fd = xopen(file, O_RDONLY); /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */ /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */ printf("Mac %-14s" "IP %-13s" "Host %-15s" "Expires %s\n", "Address", "Address", "Name", (opt & OPT_a) ? "at" : "in" ); xread(fd, &written_at, sizeof(written_at)); written_at = SWAP_BE64(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)) { struct in_addr addr; int64_t expires_abs; const char *fmt = ":%02x" + 1; for (i = 0; i < 6; i++) { printf(fmt, lease.lease_mac[i]); fmt = ":%02x"; } addr.s_addr = lease.lease_nip; #if ENABLE_UNICODE_SUPPORT { char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19); printf(" %-16s%s ", inet_ntoa(addr), uni_name); free(uni_name); } #else /* 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); #endif expires_abs = ntohl(lease.expires) + written_at; if (expires_abs <= curr) { puts("expired"); continue; } if (opt & OPT_d) { /* -d: decimal time */ if (!(opt & OPT_a)) expires_abs -= curr; printf("%llu\n", (unsigned long long) expires_abs); 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; }