networking/udhcp/dumpleases.c

   1 #include <fcntl.h>
   2 #include <string.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <sys/wait.h>
   6 #include <arpa/inet.h>
   7 #include <netdb.h>
   8 #include <netinet/in.h>
   9 #include <stdio.h>
  10 #include <sys/socket.h>
  11 #include <unistd.h>
  12 #include <getopt.h>
  13 #include <time.h>
  14
  15 #include "leases.h"
  16 #include "libbb_udhcp.h"
  17
  18 #define REMAINING 0
  19 #define ABSOLUTE 1
  20
  21
  22 #ifndef IN_BUSYBOX
  23 static void __attribute__ ((noreturn)) show_usage(void)
  24 {
  25         printf(
  26 "Usage: dumpleases -f <file> -[r|a]\n\n"
  27 "  -f, --file=FILENAME             Leases file to load\n"
  28 "  -r, --remaining                 Interepret lease times as time remaing\n"
  29 "  -a, --absolute                  Interepret lease times as expire time\n");
  30         exit(0);
  31 }
  32 #else
  33 #define show_usage bb_show_usage
  34 #endif
  35
  36
  37 #ifdef IN_BUSYBOX
  38 int dumpleases_main(int argc, char *argv[])
  39 #else
  40 int main(int argc, char *argv[])
  41 #endif
  42 {
  43         FILE *fp;
  44         int i, c, mode = REMAINING;
  45         long expires;
  46         const char *file = LEASES_FILE;
  47         struct dhcpOfferedAddr lease;
  48         struct in_addr addr;
  49
  50         static const struct option options[] = {
  51                 {"absolute", 0, 0, 'a'},
  52                 {"remaining", 0, 0, 'r'},
  53                 {"file", 1, 0, 'f'},
  54                 {0, 0, 0, 0}
  55         };
  56
  57         while (1) {
  58                 int option_index = 0;
  59                 c = getopt_long(argc, argv, "arf:", options, &option_index);
  60                 if (c == -1) break;
  61
  62                 switch (c) {
  63                 case 'a': mode = ABSOLUTE; break;
  64                 case 'r': mode = REMAINING; break;
  65                 case 'f':
  66                         file = optarg;
  67                         break;
  68                 default:
  69                         show_usage();
  70                 }
  71         }
  72
  73         fp = xfopen(file, "r");
  74
  75         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  76         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  77         while (fread(&lease, sizeof(lease), 1, fp)) {
  78
  79                 for (i = 0; i < 6; i++) {
  80                         printf("%02x", lease.chaddr[i]);
  81                         if (i != 5) printf(":");
  82                 }
  83                 addr.s_addr = lease.yiaddr;
  84                 printf(" %-15s", inet_ntoa(addr));
  85                 expires = ntohl(lease.expires);
  86                 printf(" ");
  87                 if (mode == REMAINING) {
  88                         if (!expires) printf("expired\n");
  89                         else {
  90                                 if (expires > 60*60*24) {
  91                                         printf("%ld days, ", expires / (60*60*24));
  92                                         expires %= 60*60*24;
  93                                 }
  94                                 if (expires > 60*60) {
  95                                         printf("%ld hours, ", expires / (60*60));
  96                                         expires %= 60*60;
  97                                 }
  98                                 if (expires > 60) {
  99                                         printf("%ld minutes, ", expires / 60);
 100                                         expires %= 60;
 101                                 }
 102                                 printf("%ld seconds\n", expires);
 103                         }
 104                 } else printf("%s", ctime(&expires));
 105         }
 106         fclose(fp);
 107
 108         return 0;
 109 }