static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
gpointer user_data)
{
GDHCPServer *dhcp_server = user_data;
struct dhcp_packet packet;
struct dhcp_lease *lease;
uint32_t requested_nip = 0;
uint8_t type, *server_id_option, *request_ip_option, *host_name;
int re;
GDHCPOptionType option_type;
char *option_value;
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
dhcp_server->listener_watch = 0;
return FALSE;
}
re = dhcp_recv_l3_packet(&packet, dhcp_server->listener_sockfd);
if (re < 0)
return TRUE;
type = check_packet_type(&packet);
if (type == 0)
return TRUE;
server_id_option = dhcp_get_option(&packet, DHCP_SERVER_ID);
if (server_id_option) {
uint32_t server_nid = get_be32(server_id_option);
if (server_nid != dhcp_server->server_nip)
return TRUE;
}
request_ip_option = dhcp_get_option(&packet, DHCP_REQUESTED_IP);
if (request_ip_option)
requested_nip = get_be32(request_ip_option);
lease = find_lease_by_mac(dhcp_server, packet.chaddr);
switch (type) {
case DHCPDISCOVER:
debug(dhcp_server, "Received DISCOVER");
send_offer(dhcp_server, &packet, lease, requested_nip);
break;
case DHCPREQUEST:
debug(dhcp_server, "Received REQUEST NIP %d",
requested_nip);
if (requested_nip == 0) {
requested_nip = packet.ciaddr;
if (requested_nip == 0)
break;
}
if (lease && requested_nip == lease->lease_nip) {
debug(dhcp_server, "Sending ACK");
host_name =
dhcp_get_option(&packet,
DHCP_HOST_NAME);
option_type =
dhcp_get_code_type(DHCP_HOST_NAME);
option_value =
malloc_option_value_string(host_name,
option_type);
send_ACK(dhcp_server, &packet,
lease->lease_nip);
if (dhcp_server->save_ack_lease_func)
dhcp_server->save_ack_lease_func(
option_value,
lease->lease_mac,
lease->lease_nip);
g_free(option_value);
break;
}
if (server_id_option || !lease) {
debug(dhcp_server, "Sending NAK");
send_NAK(dhcp_server, &packet);
}
break;
case DHCPDECLINE:
debug(dhcp_server, "Received DECLINE");
if (!server_id_option)
break;
if (!request_ip_option)
break;
if (!lease)
break;
if (requested_nip == lease->lease_nip)
remove_lease(dhcp_server, lease);
break;
case DHCPRELEASE:
debug(dhcp_server, "Received RELEASE");
if (!server_id_option)
break;
if (!lease)
break;
if (packet.ciaddr == lease->lease_nip)
lease_set_expire(dhcp_server, lease,
time(NULL));
break;
case DHCPINFORM:
debug(dhcp_server, "Received INFORM");
send_inform(dhcp_server, &packet);
break;
}
return TRUE;
}
static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
gpointer user_data)
{
GDHCPServer *dhcp_server = user_data;
struct dhcp_packet packet;
struct dhcp_lease *lease;
uint32_t requested_nip = 0;
uint8_t type, *server_id_option, *request_ip_option;
int re;
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
dhcp_server->listener_watch = 0;
return FALSE;
}
re = dhcp_recv_l3_packet(&packet, dhcp_server->listener_sockfd);
if (re < 0)
return TRUE;
type = check_packet_type(&packet);
if (type == 0)
return TRUE;
server_id_option = dhcp_get_option(&packet, DHCP_SERVER_ID);
if (server_id_option) {
uint32_t server_nid = dhcp_get_unaligned(
(uint32_t *) server_id_option);
if (server_nid != dhcp_server->server_nip)
return TRUE;
}
request_ip_option = dhcp_get_option(&packet, DHCP_REQUESTED_IP);
if (request_ip_option)
requested_nip = dhcp_get_unaligned(
(uint32_t *) request_ip_option);
lease = find_lease_by_mac(dhcp_server, packet.chaddr);
switch (type) {
case DHCPDISCOVER:
debug(dhcp_server, "Received DISCOVER");
send_offer(dhcp_server, &packet, lease, requested_nip);
break;
case DHCPREQUEST:
debug(dhcp_server, "Received REQUEST NIP %d",
requested_nip);
if (requested_nip == 0) {
requested_nip = packet.ciaddr;
if (requested_nip == 0)
break;
}
if (lease && requested_nip == lease->lease_nip) {
debug(dhcp_server, "Sending ACK");
send_ACK(dhcp_server, &packet,
lease->lease_nip);
break;
}
if (server_id_option || lease == NULL) {
debug(dhcp_server, "Sending NAK");
send_NAK(dhcp_server, &packet);
}
break;
case DHCPDECLINE:
debug(dhcp_server, "Received DECLINE");
if (server_id_option == NULL)
break;
if (request_ip_option == NULL)
break;
if (lease == NULL)
break;
if (requested_nip == lease->lease_nip)
remove_lease(dhcp_server, lease);
break;
case DHCPRELEASE:
debug(dhcp_server, "Received RELEASE");
if (server_id_option == NULL)
break;
if (lease == NULL)
break;
if (packet.ciaddr == lease->lease_nip)
lease_set_expire(dhcp_server, lease,
time(NULL));
break;
case DHCPINFORM:
debug(dhcp_server, "Received INFORM");
send_inform(dhcp_server, &packet);
break;
}
return TRUE;
}