Added renewal option add/search on DHCP.

include/dhcp.h

@@ -251,6 +251,20 @@ namespace Tins {
          */
         bool search_lease_time(uint32_t *value);
         
+        /** 
+         * \brief Adds a lease renewal time option.
+         * \param time The lease renew time.
+         * \return True if the option was added successfully. \sa DHCP::add_option
+         */
+        bool add_renewal_time(uint32_t time);
+        
+        /**
+         * \brief Searchs for a lease renewal time option.
+         * \param value A pointer in which the option's value will be stored.
+         * \return True if the option was found, false otherwise.
+         */
+        bool search_renewal_time(uint32_t *value);
+        
         /**
          * \brief Adds a subnet mask option.
          * \param mask The subnet mask.

src/dhcp.cpp

@@ -142,6 +142,19 @@ bool Tins::DHCP::search_lease_time(uint32_t *value) {
     return false;
 }
 
+bool Tins::DHCP::add_renewal_time(uint32_t time) {
+    time = Utils::net_to_host_l(time);
+    return add_option(DHCP_RENEWAL_TIME, sizeof(uint32_t), (const uint8_t*)&time);
+}
+        
+bool Tins::DHCP::search_renewal_time(uint32_t *value) {
+    if(generic_search(DHCP_RENEWAL_TIME, value)) {
+        *value = Utils::net_to_host_l(*value);
+        return true;
+    }
+    return false;
+}
+
 bool Tins::DHCP::add_subnet_mask(uint32_t mask) {
     return add_option(SUBNET_MASK, sizeof(uint32_t), (const uint8_t*)&mask);
 }