Mercurial > hg > toybox

comparison toys/pending/dumpleases.c @ 1117:4c664a479dd5 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
dumpleases (for dhcpd) submitted by Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Sun, 10 Nov 2013 18:25:18 -0600
parents
children 473491dbd8c3
comparison
equal deleted inserted replaced
1116:b2a8f64a564b 1117:4c664a479dd5
1 /* dumpleases.c - Dump the leases granted by udhcpd.
2 *
3 * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
5 *
6
7 USE_DUMPLEASES(NEWTOY(dumpleases, ">0arf:[!ar]", TOYFLAG_USR|TOYFLAG_BIN))
8
9 config DUMPLEASES
10 bool "dumpleases"
11 default n
12 help
13 Usage: dumpleases [-r|-a] [-f LEASEFILE]
14
15 Display DHCP leases granted by udhcpd
16 -f FILE, Lease file
17 -r Show remaining time
18 -a Show expiration time
19 */
20
21 #define FOR_dumpleases
22 #include "toys.h"
23 #include "toynet.h"
24
25 GLOBALS(
26 char *file;
27 )
28
29 //lease structure
30 struct lease {
31 uint32_t expires;
32 uint32_t lease_nip;
33 uint8_t lease_mac[6];
34 char hostname[20];
35 uint8_t pad[2]; //Padding
36 };
37
38 void dumpleases_main(void)
39 {
40 struct in_addr addr;
41 struct lease lease_struct;
42 int64_t written_time , current_time, exp;
43 int i, fd;
44
45 if(!(toys.optflags & FLAG_f)) TT.file = "/var/lib/misc/udhcpd.leases"; //DEF_LEASE_FILE
46 fd = xopen(TT.file, O_RDONLY);
47 xprintf("Mac Address IP Address Host Name Expires %s\n", (toys.optflags & FLAG_a) ? "at" : "in");
48 xread(fd, &written_time, sizeof(written_time));
49 current_time = time(NULL);
50 written_time = SWAP_BE64(written_time);
51 if(current_time < written_time) written_time = current_time;
52
53 while(sizeof(lease_struct) ==
54 (readall(fd, &lease_struct, sizeof(lease_struct)))) {
55 for (i = 0; i < 6; i++) printf(":%02x"+ !i, lease_struct.lease_mac[i]);
56
57 addr.s_addr = lease_struct.lease_nip;
58 lease_struct.hostname[19] = '\0';
59 xprintf(" %-16s%-20s", inet_ntoa(addr), lease_struct.hostname );
60 exp = ntohl(lease_struct.expires) + written_time;
61 if (exp <= current_time) {
62 xputs("expired");
63 continue;
64 }
65 if (!(toys.optflags & FLAG_a)) {
66 unsigned dt, hr, m;
67 unsigned expires = exp - current_time;
68 dt = expires / (24*60*60); expires %= (24*60*60);
69 hr = expires / (60*60); expires %= (60*60);
70 m = expires / 60; expires %= 60;
71 if (dt) xprintf("%u days ", dt);
72 xprintf("%02u:%02u:%02u\n", hr, m, (unsigned)expires);
73 } else {
74 fputs(ctime((const time_t*)&exp), stdout);
75 }
76 }
77 xclose(fd);
78 }