static void send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
{
if (dhcp_pkt->gateway_nip)
send_packet_to_relay(dhcp_pkt);
else
send_packet_to_client(dhcp_pkt, force_broadcast);
}
static void send_ACK(GDHCPServer *dhcp_server,
struct dhcp_packet *client_packet, uint32_t dest)
{
struct dhcp_packet packet;
uint32_t lease_time_sec;
struct in_addr addr;
init_packet(dhcp_server, &packet, client_packet, DHCPACK);
packet.yiaddr = htonl(dest);
lease_time_sec = dhcp_server->lease_seconds;
dhcp_add_option_uint32(&packet, DHCP_LEASE_TIME, lease_time_sec);
add_server_options(dhcp_server, &packet);
addr.s_addr = htonl(dest);
debug(dhcp_server, "Sending ACK to %s", inet_ntoa(addr));
send_packet_to_client(dhcp_server, &packet);
add_lease(dhcp_server, 0, packet.chaddr, packet.yiaddr);
if (dhcp_server->event_fn)
dhcp_server->event_fn(ether_ntoa((void*)packet.chaddr),
inet_ntoa(addr),
dhcp_server->fn_data);
}
static void send_inform(GDHCPServer *dhcp_server,
struct dhcp_packet *client_packet)
{
struct dhcp_packet packet;
init_packet(dhcp_server, &packet, client_packet, DHCPACK);
add_server_options(dhcp_server, &packet);
send_packet_to_client(dhcp_server, &packet);
}
/* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */
static int send_packet(struct dhcpMessage *payload, int force_broadcast)
{
int ret;
if (payload->giaddr)
ret = send_packet_to_relay(payload);
else ret = send_packet_to_client(payload, force_broadcast);
return ret;
}
static void send_offer(GDHCPServer *dhcp_server,
struct dhcp_packet *client_packet,
struct dhcp_lease *lease,
uint32_t requested_nip)
{
struct dhcp_packet packet;
struct in_addr addr;
init_packet(dhcp_server, &packet, client_packet, DHCPOFFER);
if (lease)
packet.yiaddr = htonl(lease->lease_nip);
else if (check_requested_nip(dhcp_server, requested_nip))
packet.yiaddr = htonl(requested_nip);
else
packet.yiaddr = htonl(find_free_or_expired_nip(
dhcp_server, client_packet->chaddr));
debug(dhcp_server, "find yiaddr %u", packet.yiaddr);
if (!packet.yiaddr) {
debug(dhcp_server, "Err: Can not found lease and send offer");
return;
}
lease = add_lease(dhcp_server, OFFER_TIME,
packet.chaddr, packet.yiaddr);
if (!lease) {
debug(dhcp_server,
"Err: No free IP addresses. OFFER abandoned");
return;
}
dhcp_add_option_uint32(&packet, DHCP_LEASE_TIME,
dhcp_server->lease_seconds);
add_server_options(dhcp_server, &packet);
addr.s_addr = packet.yiaddr;
debug(dhcp_server, "Sending OFFER of %s", inet_ntoa(addr));
send_packet_to_client(dhcp_server, &packet);
}
static void send_ACK(GDHCPServer *dhcp_server,
struct dhcp_packet *client_packet, uint32_t yiaddr)
{
struct dhcp_packet packet;
uint32_t lease_time_sec;
struct in_addr addr;
init_packet(dhcp_server, &packet, client_packet, DHCPACK);
packet.yiaddr = yiaddr;
lease_time_sec = dhcp_server->lease_seconds;
dhcp_add_simple_option(&packet, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(dhcp_server, &packet);
addr.s_addr = yiaddr;
debug(dhcp_server, "Sending ACK to %s", inet_ntoa(addr));
send_packet_to_client(dhcp_server, &packet);
add_lease(dhcp_server, 0, packet.chaddr, packet.yiaddr);
}
