/* NOINLINE: limit stack usage in caller */
static NOINLINE void send_inform(struct dhcp_packet *oldpacket)
{
struct dhcp_packet packet;
/* "If a client has obtained a network address through some other means
* (e.g., manual configuration), it may use a DHCPINFORM request message
* to obtain other local configuration parameters. Servers receiving a
* DHCPINFORM message construct a DHCPACK message with any local
* configuration parameters appropriate for the client without:
* allocating a new address, checking for an existing binding, filling
* in 'yiaddr' or including lease time parameters. The servers SHOULD
* unicast the DHCPACK reply to the address given in the 'ciaddr' field
* of the DHCPINFORM message.
* ...
* The server responds to a DHCPINFORM message by sending a DHCPACK
* message directly to the address given in the 'ciaddr' field
* of the DHCPINFORM message. The server MUST NOT send a lease
* expiration time to the client and SHOULD NOT fill in 'yiaddr'."
*/
//TODO: do a few sanity checks: is ciaddr set?
//Better yet: is ciaddr == IP source addr?
init_packet(&packet, oldpacket, DHCPACK);
add_server_options(&packet);
send_packet(&packet, /*force_bcast:*/ 0);
}
/* NOINLINE: limit stack usage in caller */
static NOINLINE void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
{
struct dhcp_packet packet;
uint32_t lease_time_sec;
struct in_addr addr;
const char *p_host_name;
init_packet(&packet, oldpacket, DHCPACK);
packet.yiaddr = yiaddr;
lease_time_sec = select_lease_time(oldpacket);
udhcp_add_simple_option(&packet, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = yiaddr;
bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
send_packet(&packet, /*force_bcast:*/ 0);
p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME);
add_lease(packet.chaddr, packet.yiaddr,
lease_time_sec,
p_host_name,
p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
);
if (ENABLE_FEATURE_UDHCPD_WRITE_LEASES_EARLY) {
/* rewrite the file with leases at every new acceptance */
write_leases();
}
}
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);
}
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);
}
// update everyone on the current netgame options
void multi_options_update_netgame()
{
ubyte data[MAX_PACKET_SIZE],code;
int packet_size = 0;
Assert(Net_player->flags & NETINFO_FLAG_GAME_HOST);
// build the header and add the opcode
BUILD_HEADER(OPTIONS_UPDATE);
code = MULTI_OPTION_SERVER;
ADD_DATA(code);
// add the netgame options
add_server_options(data, &packet_size, &Netgame.options);
// send the packet
if(Net_player->flags & NETINFO_FLAG_AM_MASTER){
multi_io_send_to_all_reliable(data, packet_size);
} else {
multi_io_send_reliable(Net_player, data, packet_size);
}
}
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);
}
/* NOINLINE: limit stack usage in caller */
static NOINLINE void send_offer(struct dhcp_packet *oldpacket,
uint32_t static_lease_nip,
struct dyn_lease *lease,
uint8_t *requested_ip_opt,
unsigned arpping_ms)
{
struct dhcp_packet packet;
uint32_t lease_time_sec;
struct in_addr addr;
init_packet(&packet, oldpacket, DHCPOFFER);
/* If it is a static lease, use its IP */
packet.yiaddr = static_lease_nip;
/* Else: */
if (!static_lease_nip) {
/* We have no static lease for client's chaddr */
uint32_t req_nip;
const char *p_host_name;
if (lease) {
/* We have a dynamic lease for client's chaddr.
* Reuse its IP (even if lease is expired).
* Note that we ignore requested IP in this case.
*/
packet.yiaddr = lease->lease_nip;
}
/* Or: if client has requested an IP */
else if (requested_ip_opt != NULL
/* (read IP) */
&& (move_from_unaligned32(req_nip, requested_ip_opt), 1)
/* and the IP is in the lease range */
&& ntohl(req_nip) >= server_config.start_ip
&& ntohl(req_nip) <= server_config.end_ip
/* and */
&& ( !(lease = find_lease_by_nip(req_nip)) /* is not already taken */
|| is_expired_lease(lease) /* or is taken, but expired */
)
) {
packet.yiaddr = req_nip;
}
else {
/* Otherwise, find a free IP */
packet.yiaddr = find_free_or_expired_nip(oldpacket->chaddr, arpping_ms);
}
if (!packet.yiaddr) {
bb_error_msg("no free IP addresses. OFFER abandoned");
return;
}
/* Reserve the IP for a short time hoping to get DHCPREQUEST soon */
p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME);
lease = add_lease(packet.chaddr, packet.yiaddr,
server_config.offer_time,
p_host_name,
p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
);
if (!lease) {
bb_error_msg("no free IP addresses. OFFER abandoned");
return;
}
}
lease_time_sec = select_lease_time(oldpacket);
udhcp_add_simple_option(&packet, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = packet.yiaddr;
bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
/* send_packet emits error message itself if it detects failure */
send_packet(&packet, /*force_bcast:*/ 0);
}