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

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