/*packet.yiaddr = req_align; */
if((req_align != server_config.server)
#ifdef SUPPORT_DHCP_FRAG
&& (req_align != router_ip) && (1 == tmpNum))/*A36D02806, s60000658, 20060906*/
#else
&& (req_align != router_ip))/*A36D02806, s60000658, 20060906*/
#endif
{
packet.yiaddr = req_align;
}
else
{
#ifdef SUPPORT_DHCP_FRAG
if(1 == inmaster)
{
packet.yiaddr = find_address2(0);
}
else
#endif
packet.yiaddr = find_address(0);
}
/*end of DHCP 网关会分配自己的维护IP porting by w44771 20060505*/
/* otherwise, find a free IP */
} else {
#ifdef SUPPORT_DHCP_FRAG
if(1 == inmaster)
{
packet.yiaddr = find_address2(0);
}
/* 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;
struct option_set *curr;
struct in_addr addr;
unsigned char mac[6];
u_int32_t reserved_ip;
memcpy(mac, oldpacket->chaddr, 6);
init_packet(&packet, oldpacket, DHCPOFFER);
/* ADDME: if static, short circuit */
/* the client is in our lease/offered table */
if ((lease = find_lease_by_chaddr(oldpacket->chaddr)) &&
/* Make sure the IP is not already used on network */
!check_ip(lease->yiaddr)) {
if (!lease_expired(lease))
lease_time_align = lease->expires - time(0);
packet.yiaddr = lease->yiaddr;
/* Find a reserved ip for this MAC */
} else if ( (reserved_ip = find_reserved_ip(mac)) != 0) {
packet.yiaddr = htonl(reserved_ip);
/* Or the client has a requested ip */
} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) &&
/* Don't look here (ugly hackish thing to do) */
memcpy(&req_align, req, 4) &&
/* check if the requested ip has been reserved */
check_reserved_ip(req_align, mac) &&
/* and the ip is in the lease range */
ntohl(req_align) >= ntohl(server_config.start) &&
ntohl(req_align) <= ntohl(server_config.end) &&
/* Check that this request ip is not on network */
//!check_ip(ntohl(req_align)) &&
/* the input parameter of check_ip() should be network order */
!check_ip(req_align) && /* modified by Max Ding, 07/07/2011 @TD #42 of WNR3500Lv2 */
/* and its not already taken/offered */ /* ADDME: check that its not a static lease */
((!(lease = find_lease_by_yiaddr(req_align)) ||
/* or its taken, but expired */ /* ADDME: or maybe in here */
lease_expired(lease)))) {
packet.yiaddr = req_align;
/* otherwise, find a free IP */ /*ADDME: is it a static lease? */
} else {
packet.yiaddr = find_address2(0, mac);
/* try for an expired lease */
if (!packet.yiaddr) packet.yiaddr = find_address2(1, mac);
}
if(!packet.yiaddr) {
LOG(LOG_WARNING, "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");
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)
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)
lease_time_align = server_config.lease;
/* For guest network clients, set lease time to 30 minutes */
if (is_guest_network(mac)) {
lease_time_align = GUEST_LEASE_TIME;
DEBUG(LOG_INFO, "send OFFER to guest network client with lease time %d sec", GUEST_LEASE_TIME);
}
/* ADDME: end of short circuit */
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_option_string(packet.options, curr->data);
curr = curr->next;
}
add_bootp_options(&packet);
addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, 0);
}
