changeset 1117:4c664a479dd5

dumpleases (for dhcpd) submitted by Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Sun, 10 Nov 2013 18:25:18 -0600
parents b2a8f64a564b
children 04f83dae08b4
files toys/pending/dumpleases.c
diffstat 1 files changed, 78 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/pending/dumpleases.c	Sun Nov 10 18:25:18 2013 -0600
@@ -0,0 +1,78 @@
+/* dumpleases.c - Dump the leases granted by udhcpd.
+ *
+ * Copyright 2013 Sandeep Sharma <sandeep.jack2756@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+
+USE_DUMPLEASES(NEWTOY(dumpleases, ">0arf:[!ar]", TOYFLAG_USR|TOYFLAG_BIN))
+
+config DUMPLEASES
+  bool "dumpleases"
+  default n
+  help
+  Usage: dumpleases [-r|-a] [-f LEASEFILE]
+
+    Display DHCP leases granted by udhcpd
+    -f FILE,  Lease file
+    -r        Show remaining time
+    -a        Show expiration time
+*/
+
+#define FOR_dumpleases
+#include "toys.h"
+#include "toynet.h"
+
+GLOBALS(
+    char *file;
+)
+
+//lease structure
+struct lease { 
+  uint32_t expires;
+  uint32_t lease_nip;
+  uint8_t lease_mac[6];
+  char hostname[20];
+  uint8_t pad[2]; //Padding
+};
+
+void dumpleases_main(void)
+{
+  struct in_addr addr;
+  struct lease lease_struct;
+  int64_t written_time , current_time, exp;
+  int i, fd; 
+  
+  if(!(toys.optflags & FLAG_f)) TT.file = "/var/lib/misc/udhcpd.leases"; //DEF_LEASE_FILE
+  fd = xopen(TT.file, O_RDONLY);
+  xprintf("Mac Address       IP Address      Host Name           Expires %s\n", (toys.optflags & FLAG_a) ? "at" : "in");
+  xread(fd, &written_time, sizeof(written_time));
+  current_time = time(NULL);
+  written_time = SWAP_BE64(written_time);
+  if(current_time < written_time) written_time = current_time;
+
+  while(sizeof(lease_struct) == 
+      (readall(fd, &lease_struct, sizeof(lease_struct)))) {
+    for (i = 0; i < 6; i++) printf(":%02x"+ !i, lease_struct.lease_mac[i]);
+    
+    addr.s_addr = lease_struct.lease_nip;
+    lease_struct.hostname[19] = '\0';
+    xprintf(" %-16s%-20s", inet_ntoa(addr), lease_struct.hostname );
+    exp = ntohl(lease_struct.expires) + written_time;
+    if (exp <= current_time) {
+      xputs("expired");
+      continue;
+    }
+    if (!(toys.optflags & FLAG_a)) { 
+      unsigned dt, hr, m;
+      unsigned expires = exp - current_time;
+      dt = expires / (24*60*60); expires %= (24*60*60);
+      hr = expires / (60*60); expires %= (60*60);
+      m = expires / 60; expires %= 60;
+      if (dt) xprintf("%u days ", dt);
+      xprintf("%02u:%02u:%02u\n", hr, m, (unsigned)expires);
+    } else {
+      fputs(ctime((const time_t*)&exp), stdout);
+    }
+  }
+  xclose(fd);
+}