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 <sys/stat.h>
   7 #include <arpa/inet.h>
   8 #include <netdb.h>
   9 #include <netinet/in.h>
  10 #include <stdio.h>
  11 #include <sys/types.h>
  12 #include <sys/socket.h>
  13 #include <unistd.h>
  14 #include <syslog.h>
  15 #include <signal.h>
  16 #include <errno.h>
  17 #include <getopt.h>
  18 #include <time.h>
  19
  20 #include "libbb_udhcp.h"
  21
  22 #define REMAINING 0
  23 #define ABSOLUTE 1
  24
  25 struct lease_t {
  26         unsigned char chaddr[16];
  27         u_int32_t yiaddr;
  28         u_int32_t expires;
  29 };
  30
  31 #ifdef BB_VER
  32 int dumpleases_main(int argc, char *argv[])
  33 #else
  34 int main(int argc, char *argv[])
  35 #endif
  36 {
  37         FILE *fp;
  38         int i, c, mode = REMAINING;
  39         long expires;
  40         char file[255] = "/var/lib/misc/udhcpd.leases";
  41         struct lease_t lease;
  42         struct in_addr addr;
  43
  44         static struct option options[] = {
  45                 {"absolute", 0, 0, 'a'},
  46                 {"remaining", 0, 0, 'r'},
  47                 {"file", 1, 0, 'f'},
  48                 {"help", 0, 0, 'h'},
  49                 {0, 0, 0, 0}
  50         };
  51
  52         while (1) {
  53                 int option_index = 0;
  54                 c = getopt_long(argc, argv, "arf:h", options, &option_index);
  55                 if (c == -1) break;
  56
  57                 switch (c) {
  58                 case 'a': mode = ABSOLUTE; break;
  59                 case 'r': mode = REMAINING; break;
  60                 case 'f':
  61                         strncpy(file, optarg, 255);
  62                         file[254] = '\0';
  63                         break;
  64                 case 'h':
  65                         printf("Usage: dumpleases -f <file> -[r|a]\n\n");
  66                         printf("  -f, --file=FILENAME             Leases file to load\n");
  67                         printf("  -r, --remaining                 Interepret lease times as time remaing\n");
  68                         printf("  -a, --absolute                  Interepret lease times as expire time\n");
  69                         break;
  70                 }
  71         }
  72
  73         if (!(fp = fopen(file, "r"))) {
  74                 perror("could not open input file");
  75                 return 0;
  76         }
  77
  78         printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");
  79         /*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
  80         while (fread(&lease, sizeof(lease), 1, fp)) {
  81
  82                 for (i = 0; i < 6; i++) {
  83                         printf("%02x", lease.chaddr[i]);
  84                         if (i != 5) printf(":");
  85                 }
  86                 addr.s_addr = lease.yiaddr;
  87                 printf(" %-15s", inet_ntoa(addr));
  88                 expires = ntohl(lease.expires);
  89                 printf(" ");
  90                 if (mode == REMAINING) {
  91                         if (!expires) printf("expired\n");
  92                         else {
  93                                 if (expires > 60*60*24) {
  94                                         printf("%ld days, ", expires / (60*60*24));
  95                                         expires %= 60*60*24;
  96                                 }
  97                                 if (expires > 60*60) {
  98                                         printf("%ld hours, ", expires / (60*60));
  99                                         expires %= 60*60;
 100                                 }
 101                                 if (expires > 60) {
 102                                         printf("%ld minutes, ", expires / 60);
 103                                         expires %= 60;
 104                                 }
 105                                 printf("%ld seconds\n", expires);
 106                         }
 107                 } else printf("%s", ctime(&expires));
 108         }
 109         fclose(fp);
 110
 111         return 0;
 112 }