dhclient dhcpctl usage

[Ed Ravin]

On Sun, Jan 08, 2012 at 08:55:37PM +0200, Boaz Ben-David wrote:
> I need to control the dhcp daemon using c/c++.
> Can I do this using dhcpctl? I saw a mention of this in the dhclient man page but I could not find any example of this.

Here's an example - the "omcmd" utility provides a command-line
interface to the API:

   http://freecode.com/projects/omcmd

Attached is a patch for a problem with bad processing of dates
on Intel platforms that you'll probably want.  Also, the docs
in the package are a bit out of date, they refer to a problem
(not able to free leases via the API) that has since been (somewhat
circuitously) fixed in the server.
-------------- next part --------------
--- omfuncs.c	2011/11/07 06:38:10	1.1
+++ omfuncs.c	2011/11/07 06:46:59
@@ -174,8 +174,9 @@
     case op_cltt:
 	strptime(val, "%a %b %d %T %Y", &timestruct);
 	timeval=mktime(&timestruct);
+	netint=htonl((unsigned long)timeval);
 	omapi_data_string_new(&value, 4, MDL);
-	memcpy(value->value, &timeval, 4);
+	memcpy(value->value, &netint, 4);
 	break;
     case op_name:
     case op_client_hostname:
@@ -215,8 +216,9 @@
     case op_tstp:
     case op_tsfp:
     case op_cltt:
-	memcpy(&thetime, value->value, value->len);
-	ctime_r(&thetime,buf);
+	memcpy(&netint, value->value, value->len);
+	hostint=ntohl(netint);
+	ctime_r((time_t *) &hostint,buf);
 	buf[strlen(buf)-1]='\0';
 	break;
     case op_ipaddr: