int dhcpd_sendack(in_addr_t ipaddr)
{
uint32_t leasetime = CONFIG_NETUTILS_DHCPD_LEASETIME;
in_addr_t netaddr;
/* Initialize the ACK response */
dhcpd_initpacket(DHCPACK);
memcpy(g_state.ds_outpacket.ciaddr, g_state.ds_inpacket.ciaddr, 4);
/* Add the IP address assigned to the client */
netaddr = htonl(ipaddr);
memcpy(g_state.ds_outpacket.yiaddr, &netaddr, 4);
/* Did the client request a specific lease time? */
(void)dhcpd_verifyreqleasetime(&leasetime);
/* Add the lease time to the response */
dhcpd_addoption32(DHCP_OPTION_LEASE_TIME, htonl(leasetime));
#ifdef CONFIG_NETUTILS_DHCPD_IGNOREBROADCAST
if (dhcpd_sendpacket(true) < 0)
#else
if (dhcpd_sendpacket(false) < 0)
#endif
{
return ERROR;
}
dhcpd_setlease(g_state.ds_inpacket.chaddr, ipaddr, leasetime);
return OK;
}
int dhcpd_sendack(in_addr_t ipaddr)
{
uint32_t leasetime = CONFIG_NETUTILS_DHCPD_LEASETIME;
in_addr_t netaddr;
#ifdef HAVE_DSNIP
uint32_t dnsaddr;
dnsaddr = htonl(CONFIG_NETUTILS_DHCPD_DNSIP);
#endif
/* Initialize the ACK response */
dhcpd_initpacket(DHCPACK);
memcpy(g_state.ds_outpacket.ciaddr, g_state.ds_inpacket.ciaddr, 4);
/* Add the IP address assigned to the client */
netaddr = htonl(ipaddr);
memcpy(g_state.ds_outpacket.yiaddr, &netaddr, 4);
/* Did the client request a specific lease time? */
(void)dhcpd_verifyreqleasetime(&leasetime);
/* Add the lease time to the response */
dhcpd_addoption32(DHCP_OPTION_LEASE_TIME, htonl(leasetime));
#ifdef HAVE_NETMASK
dhcpd_addoption32(DHCP_OPTION_SUBNET_MASK, htonl(CONFIG_NETUTILS_DHCPD_NETMASK));
#endif
#ifdef HAVE_ROUTERIP
dhcpd_addoption32(DHCP_OPTION_ROUTER, htonl(CONFIG_NETUTILS_DHCPD_ROUTERIP));
#endif
#ifdef HAVE_DSNIP
dhcp_addoption32p(DHCP_OPTION_DNS_SERVER, (FAR uint8_t*)&dnsaddr);
#endif
#ifdef CONFIG_NETUTILS_DHCPD_IGNOREBROADCAST
if (dhcpd_sendpacket(true) < 0)
#else
if (dhcpd_sendpacket(false) < 0)
#endif
{
return ERROR;
}
dhcpd_setlease(g_state.ds_inpacket.chaddr, ipaddr, leasetime);
return OK;
}
static inline int dhcpd_discover(void)
{
struct lease_s *lease;
in_addr_t ipaddr;
uint32_t leasetime = CONFIG_NETUTILS_DHCPD_LEASETIME;
/* Check if the client is aleady in the lease table */
lease = dhcpd_findbymac(g_state.ds_inpacket.chaddr);
if (lease)
{
/* Yes... get the remaining time on the lease */
#ifdef HAVE_LEASE_TIME
if (!dhcpd_leaseexpired(lease))
{
leasetime = lease->expiry - dhcpd_time();
if (leasetime < CONFIG_NETUTILS_DHCPD_MINLEASETIME)
{
leasetime = CONFIG_NETUTILS_DHCPD_MINLEASETIME;
}
}
#endif
/* Get the IP address associated with the lease (host order) */
ipaddr = dhcp_leaseipaddr(lease);
nvdbg("Already have lease for IP %08lx\n", (long)ipaddr);
}
/* Check if the client has requested a specific IP address */
else if (dhcpd_verifyreqip())
{
/* Use the requested IP address (host order) */
ipaddr = g_state.ds_optreqip;
nvdbg("User requested IP %08lx\n", (long)ipaddr);
}
else
{
/* No... allocate a new IP address (host order)*/
ipaddr = dhcpd_allocipaddr();
nvdbg("Allocated IP %08lx\n", (long)ipaddr);
}
/* Did we get any IP address? */
if (!ipaddr)
{
/* Nope... return failure */
ndbg("Failed to get IP address\n");
return ERROR;
}
/* Reserve the leased IP for a shorter time for the offer */
if (!dhcpd_setlease(g_state.ds_inpacket.chaddr, ipaddr, CONFIG_NETUTILS_DHCPD_OFFERTIME))
{
ndbg("Failed to set lease\n");
return ERROR;
}
/* Check if the client has requested a specific lease time */
(void)dhcpd_verifyreqleasetime(&leasetime);
/* Send the offer response */
return dhcpd_sendoffer(ipaddr, leasetime);
}
