blob: 70d2d1434a5f0b9597de630589aeb9d5761efdb7 [file] [log] [blame]
Mike Frysinger7031f622006-05-08 03:20:50 +00001/* vi: set sw=4 ts=4: */
2/*
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02003 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
Mike Frysinger7031f622006-05-08 03:20:50 +00004 */
Denys Vlasenkodbbc3f22017-08-07 23:30:22 +02005//applet:IF_DUMPLEASES(APPLET_NOEXEC(dumpleases, dumpleases, BB_DIR_USR_BIN, BB_SUID_DROP, dumpleases))
Denys Vlasenkof7683cd2016-11-23 18:54:59 +01006
7//kbuild:lib-$(CONFIG_DUMPLEASES) += dumpleases.o
Pere Orga5bc8c002011-04-11 03:29:49 +02008
9//usage:#define dumpleases_trivial_usage
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020010//usage: "[-r|-a] [-d] [-f LEASEFILE]"
Pere Orga5bc8c002011-04-11 03:29:49 +020011//usage:#define dumpleases_full_usage "\n\n"
12//usage: "Display DHCP leases granted by udhcpd\n"
Pere Orga5bc8c002011-04-11 03:29:49 +020013//usage: IF_LONG_OPTS(
Denys Vlasenkobbc7bee2017-01-21 02:49:58 +010014//usage: "\n -f,--file FILE Lease file"
Pere Orga5bc8c002011-04-11 03:29:49 +020015//usage: "\n -r,--remaining Show remaining time"
16//usage: "\n -a,--absolute Show expiration time"
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020017//usage: "\n -d,--decimal Show time in seconds"
Pere Orga5bc8c002011-04-11 03:29:49 +020018//usage: )
19//usage: IF_NOT_LONG_OPTS(
20//usage: "\n -f FILE Lease file"
21//usage: "\n -r Show remaining time"
22//usage: "\n -a Show expiration time"
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020023//usage: "\n -d Show time in seconds"
Pere Orga5bc8c002011-04-11 03:29:49 +020024//usage: )
25
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000026#include "common.h"
Mike Frysinger7031f622006-05-08 03:20:50 +000027#include "dhcpd.h"
Tomas Heinrich85bb8432009-11-05 08:42:47 +010028#include "unicode.h"
Denis Vlasenko5a3395b2006-11-18 19:51:32 +000029
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000030int dumpleases_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000031int dumpleases_main(int argc UNUSED_PARAM, char **argv)
Mike Frysinger7031f622006-05-08 03:20:50 +000032{
Denis Vlasenko5e43d852007-03-29 19:29:32 +000033 int fd;
34 int i;
35 unsigned opt;
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020036 int64_t written_at, curr;
Mike Frysinger7031f622006-05-08 03:20:50 +000037 const char *file = LEASES_FILE;
Denys Vlasenko31af3d52009-06-17 11:57:09 +020038 struct dyn_lease lease;
Mike Frysinger7031f622006-05-08 03:20:50 +000039
Denis Vlasenko5e43d852007-03-29 19:29:32 +000040 enum {
Denys Vlasenkoe4dcba12010-10-28 18:57:19 +020041 OPT_a = 0x1, // -a
42 OPT_r = 0x2, // -r
43 OPT_f = 0x4, // -f
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020044 OPT_d = 0x8, // -d
Mike Frysinger7031f622006-05-08 03:20:50 +000045 };
Denys Vlasenkof3b92d32009-06-19 12:10:38 +020046#if ENABLE_LONG_OPTS
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000047 static const char dumpleases_longopts[] ALIGN1 =
Denis Vlasenkobdc88fd2007-07-23 17:14:14 +000048 "absolute\0" No_argument "a"
49 "remaining\0" No_argument "r"
50 "file\0" Required_argument "f"
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020051 "decimal\0" No_argument "d"
Denis Vlasenko990d0f62007-07-24 15:54:42 +000052 ;
Denis Vlasenkoba2fb712007-04-01 09:39:03 +000053
Denis Vlasenko5e43d852007-03-29 19:29:32 +000054#endif
Denys Vlasenko28055022010-01-04 20:49:58 +010055 init_unicode();
Tomas Heinrich85bb8432009-11-05 08:42:47 +010056
Denys Vlasenko22542ec2017-08-08 21:55:02 +020057 opt = getopt32long(argv, "^"
58 "arf:d"
59 "\0" "=0:a--r:r--a",
60 dumpleases_longopts,
61 &file
62 );
Mike Frysinger7031f622006-05-08 03:20:50 +000063
Denis Vlasenko5e43d852007-03-29 19:29:32 +000064 fd = xopen(file, O_RDONLY);
Mike Frysinger7031f622006-05-08 03:20:50 +000065
Denis Vlasenkobd79c3d2009-04-01 12:36:09 +000066 /* "123456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789 */
Denys Vlasenkof98705a2015-10-24 20:45:10 +020067 /* "00:00:00:00:00:00 255.255.255.255 ABCDEFGHIJKLMNOPQRS Wed Jun 30 21:49:08 1993" */
68 printf("Mac %-14s" "IP %-13s" "Host %-15s" "Expires %s\n",
69 "Address", "Address", "Name",
70 (opt & OPT_a) ? "at" : "in"
71 );
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000072
Denys Vlasenko385b4562010-03-26 10:09:34 +010073 xread(fd, &written_at, sizeof(written_at));
Denys Vlasenko9ff50b82010-10-18 11:40:26 +020074 written_at = SWAP_BE64(written_at);
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000075 curr = time(NULL);
Denis Vlasenko73121c32009-02-01 00:40:45 +000076 if (curr < written_at)
77 written_at = curr; /* lease file from future! :) */
78
Denis Vlasenko5e43d852007-03-29 19:29:32 +000079 while (full_read(fd, &lease, sizeof(lease)) == sizeof(lease)) {
Isaac Dunhamd320a1e2015-10-24 20:28:04 +020080 struct in_addr addr;
81 int64_t expires_abs;
82
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000083 const char *fmt = ":%02x" + 1;
84 for (i = 0; i < 6; i++) {
Denys Vlasenko31af3d52009-06-17 11:57:09 +020085 printf(fmt, lease.lease_mac[i]);
Denis Vlasenko0416e3d2009-01-01 17:52:09 +000086 fmt = ":%02x";
Mike Frysinger7031f622006-05-08 03:20:50 +000087 }
Denys Vlasenko1d924f52009-06-16 10:23:01 +020088 addr.s_addr = lease.lease_nip;
Denys Vlasenko19158a82010-03-26 14:06:56 +010089#if ENABLE_UNICODE_SUPPORT
Denys Vlasenkoe17764c2010-01-30 23:16:21 +010090 {
Denys Vlasenkodc7e5c42011-01-11 13:08:28 +010091 char *uni_name = unicode_conv_to_printable_fixedwidth(/*NULL,*/ lease.hostname, 19);
Denys Vlasenko385b4562010-03-26 10:09:34 +010092 printf(" %-16s%s ", inet_ntoa(addr), uni_name);
Denys Vlasenkoe17764c2010-01-30 23:16:21 +010093 free(uni_name);
94 }
Tomas Heinrich85bb8432009-11-05 08:42:47 +010095#else
Denys Vlasenko385b4562010-03-26 10:09:34 +010096 /* actually, 15+1 and 19+1, +1 is a space between columns */
97 /* lease.hostname is char[20] and is always NUL terminated */
Denis Vlasenkobd79c3d2009-04-01 12:36:09 +000098 printf(" %-16s%-20s", inet_ntoa(addr), lease.hostname);
Tomas Heinrich85bb8432009-11-05 08:42:47 +010099#endif
Denis Vlasenko73121c32009-02-01 00:40:45 +0000100 expires_abs = ntohl(lease.expires) + written_at;
101 if (expires_abs <= curr) {
Denis Vlasenko0416e3d2009-01-01 17:52:09 +0000102 puts("expired");
103 continue;
104 }
Isaac Dunhamd320a1e2015-10-24 20:28:04 +0200105 if (opt & OPT_d) {
106 /* -d: decimal time */
107 if (!(opt & OPT_a))
108 expires_abs -= curr;
109 printf("%llu\n", (unsigned long long) expires_abs);
110 continue;
111 }
Denis Vlasenko5e43d852007-03-29 19:29:32 +0000112 if (!(opt & OPT_a)) { /* no -a */
Denis Vlasenko0416e3d2009-01-01 17:52:09 +0000113 unsigned d, h, m;
Denis Vlasenko73121c32009-02-01 00:40:45 +0000114 unsigned expires = expires_abs - curr;
Denis Vlasenko0416e3d2009-01-01 17:52:09 +0000115 d = expires / (24*60*60); expires %= (24*60*60);
116 h = expires / (60*60); expires %= (60*60);
117 m = expires / 60; expires %= 60;
118 if (d)
119 printf("%u days ", d);
120 printf("%02u:%02u:%02u\n", h, m, (unsigned)expires);
121 } else { /* -a */
Denis Vlasenko73121c32009-02-01 00:40:45 +0000122 time_t t = expires_abs;
Denis Vlasenko0416e3d2009-01-01 17:52:09 +0000123 fputs(ctime(&t), stdout);
124 }
Mike Frysinger7031f622006-05-08 03:20:50 +0000125 }
Denis Vlasenko5e43d852007-03-29 19:29:32 +0000126 /* close(fd); */
Mike Frysinger7031f622006-05-08 03:20:50 +0000127
128 return 0;
129}