+/* vi: set sw=4 ts=4: */
/* serverpacket.c
*
- * Constuct and send DHCP server packets
+ * Construct and send DHCP server packets
*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
#include <string.h>
#include <time.h>
+#include "common.h"
#include "serverpacket.h"
#include "dhcpd.h"
#include "options.h"
-#include "common.h"
+#include "static_leases.h"
/* send a packet to giaddr using the kernel ip stack */
static int send_packet_to_relay(struct dhcpMessage *payload)
{
- DEBUG(LOG_INFO, "Forwarding packet to relay");
+ DEBUG("Forwarding packet to relay");
- return kernel_packet(payload, server_config.server, SERVER_PORT,
+ return udhcp_kernel_packet(payload, server_config.server, SERVER_PORT,
payload->giaddr, SERVER_PORT);
}
/* send a packet to a specific arp address and ip address by creating our own ip packet */
static int send_packet_to_client(struct dhcpMessage *payload, int force_broadcast)
{
- unsigned char *chaddr;
- u_int32_t ciaddr;
-
+ uint8_t *chaddr;
+ uint32_t ciaddr;
+
if (force_broadcast) {
- DEBUG(LOG_INFO, "broadcasting packet to client (NAK)");
+ DEBUG("broadcasting packet to client (NAK)");
ciaddr = INADDR_BROADCAST;
chaddr = MAC_BCAST_ADDR;
} else if (payload->ciaddr) {
- DEBUG(LOG_INFO, "unicasting packet to client ciaddr");
+ DEBUG("unicasting packet to client ciaddr");
ciaddr = payload->ciaddr;
chaddr = payload->chaddr;
} else if (ntohs(payload->flags) & BROADCAST_FLAG) {
- DEBUG(LOG_INFO, "broadcasting packet to client (requested)");
+ DEBUG("broadcasting packet to client (requested)");
ciaddr = INADDR_BROADCAST;
chaddr = MAC_BCAST_ADDR;
} else {
- DEBUG(LOG_INFO, "unicasting packet to client yiaddr");
+ DEBUG("unicasting packet to client yiaddr");
ciaddr = payload->yiaddr;
chaddr = payload->chaddr;
}
- return raw_packet(payload, server_config.server, SERVER_PORT,
+ return udhcp_raw_packet(payload, server_config.server, SERVER_PORT,
ciaddr, CLIENT_PORT, chaddr, server_config.ifindex);
}
static void init_packet(struct dhcpMessage *packet, struct dhcpMessage *oldpacket, char type)
{
- init_header(packet, type);
+ udhcp_init_header(packet, type);
packet->xid = oldpacket->xid;
memcpy(packet->chaddr, oldpacket->chaddr, 16);
packet->flags = oldpacket->flags;
{
packet->siaddr = server_config.siaddr;
if (server_config.sname)
- strncpy(packet->sname, server_config.sname, sizeof(packet->sname) - 1);
+ strncpy((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
if (server_config.boot_file)
- strncpy(packet->file, server_config.boot_file, sizeof(packet->file) - 1);
+ strncpy((char*)packet->file, server_config.boot_file, sizeof(packet->file) - 1);
}
-
+
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(struct dhcpMessage *oldpacket)
{
struct dhcpMessage packet;
struct dhcpOfferedAddr *lease = NULL;
- u_int32_t req_align, lease_time_align = server_config.lease;
- unsigned char *req, *lease_time;
+ uint32_t req_align, lease_time_align = server_config.lease;
+ uint8_t *req, *lease_time;
struct option_set *curr;
struct in_addr addr;
+ uint32_t static_lease_ip;
+
init_packet(&packet, oldpacket, DHCPOFFER);
-
+
+ static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);
+
/* ADDME: if static, short circuit */
+ if(!static_lease_ip)
+ {
/* the client is in our lease/offered table */
if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
- if (!lease_expired(lease))
+ if (!lease_expired(lease))
lease_time_align = lease->expires - time(0);
packet.yiaddr = lease->yiaddr;
-
+
/* Or the client has a requested ip */
} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) &&
/* and the ip is in the lease range */
ntohl(req_align) >= ntohl(server_config.start) &&
ntohl(req_align) <= ntohl(server_config.end) &&
-
- /* and its not already taken/offered */ /* ADDME: check that its not a static lease */
+
+ !static_lease_ip && /* Check that its not a static lease */
+ /* and is not already taken/offered */
((!(lease = find_lease_by_yiaddr(req_align)) ||
-
+
/* or its taken, but expired */ /* ADDME: or maybe in here */
lease_expired(lease)))) {
packet.yiaddr = req_align; /* FIXME: oh my, is there a host using this IP? */
- /* otherwise, find a free IP */ /*ADDME: is it a static lease? */
+ /* otherwise, find a free IP */
} else {
+ /* Is it a static lease? (No, because find_address skips static lease) */
packet.yiaddr = find_address(0);
-
+
/* try for an expired lease */
if (!packet.yiaddr) packet.yiaddr = find_address(1);
}
-
+
if(!packet.yiaddr) {
- LOG(LOG_WARNING, "no IP addresses to give -- OFFER abandoned");
+ bb_error_msg("No IP addresses to give - OFFER abandoned");
return -1;
}
-
+
if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time)) {
- LOG(LOG_WARNING, "lease pool is full -- OFFER abandoned");
+ bb_error_msg("Lease pool is full - OFFER abandoned");
return -1;
- }
+ }
if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
memcpy(&lease_time_align, lease_time, 4);
lease_time_align = ntohl(lease_time_align);
- if (lease_time_align > server_config.lease)
+ if (lease_time_align > server_config.lease)
lease_time_align = server_config.lease;
}
/* Make sure we aren't just using the lease time from the previous offer */
- if (lease_time_align < server_config.min_lease)
+ if (lease_time_align < server_config.min_lease)
lease_time_align = server_config.lease;
- /* ADDME: end of short circuit */
+ }
+ /* ADDME: end of short circuit */
+ else
+ {
+ /* It is a static lease... use it */
+ packet.yiaddr = static_lease_ip;
+ }
+
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
curr = server_config.options;
}
add_bootp_options(&packet);
-
+
addr.s_addr = packet.yiaddr;
- LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
+ bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, 0);
}
struct dhcpMessage packet;
init_packet(&packet, oldpacket, DHCPNAK);
-
- DEBUG(LOG_INFO, "sending NAK");
+
+ DEBUG("Sending NAK");
return send_packet(&packet, 1);
}
-int sendACK(struct dhcpMessage *oldpacket, u_int32_t yiaddr)
+int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr)
{
struct dhcpMessage packet;
struct option_set *curr;
- unsigned char *lease_time;
- u_int32_t lease_time_align = server_config.lease;
+ uint8_t *lease_time;
+ uint32_t lease_time_align = server_config.lease;
struct in_addr addr;
init_packet(&packet, oldpacket, DHCPACK);
packet.yiaddr = yiaddr;
-
+
if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
memcpy(&lease_time_align, lease_time, 4);
lease_time_align = ntohl(lease_time_align);
- if (lease_time_align > server_config.lease)
+ if (lease_time_align > server_config.lease)
lease_time_align = server_config.lease;
- else if (lease_time_align < server_config.min_lease)
+ else if (lease_time_align < server_config.min_lease)
lease_time_align = server_config.lease;
}
-
+
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
-
+
curr = server_config.options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_bootp_options(&packet);
addr.s_addr = packet.yiaddr;
- LOG(LOG_INFO, "sending ACK to %s", inet_ntoa(addr));
+ bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
- if (send_packet(&packet, 0) < 0)
+ if (send_packet(&packet, 0) < 0)
return -1;
add_lease(packet.chaddr, packet.yiaddr, lease_time_align);
struct option_set *curr;
init_packet(&packet, oldpacket, DHCPACK);
-
+
curr = server_config.options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
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