summaryrefslogtreecommitdiff
path: root/networking/udhcp/serverpacket.c
diff options
context:
space:
mode:
authorDenys Vlasenko2010-03-20 03:48:11 +0100
committerDenys Vlasenko2010-03-20 03:48:11 +0100
commit8a7c166ab9ad35eef8c90d6b0b3a25b8a9fbacd2 (patch)
tree150a58a93b9698a4db16187ef1952deda0acae16 /networking/udhcp/serverpacket.c
parentde9e772f46eeba347c21014d4b159f28c2c2d9c1 (diff)
downloadbusybox-8a7c166ab9ad35eef8c90d6b0b3a25b8a9fbacd2.zip
busybox-8a7c166ab9ad35eef8c90d6b0b3a25b8a9fbacd2.tar.gz
udhcp: move serverpacket.c into dhcpd.c, no other changes
function old new delta udhcpd_main 1480 1956 +476 send_inform 83 - -83 send_offer 376 - -376 ------------------------------------------------------------------------------ (add/remove: 0/3 grow/shrink: 1/0 up/down: 476/-459) Total: 17 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking/udhcp/serverpacket.c')
-rw-r--r--networking/udhcp/serverpacket.c283
1 files changed, 0 insertions, 283 deletions
diff --git a/networking/udhcp/serverpacket.c b/networking/udhcp/serverpacket.c
deleted file mode 100644
index b48e415..0000000
--- a/networking/udhcp/serverpacket.c
+++ /dev/null
@@ -1,283 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/* serverpacket.c
- *
- * Construct and send DHCP server packets
- *
- * Russ Dill <Russ.Dill@asu.edu> July 2001
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include "common.h"
-#include "dhcpc.h"
-#include "dhcpd.h"
-#include "options.h"
-
-
-/* send a packet to gateway_nip using the kernel ip stack */
-static int send_packet_to_relay(struct dhcp_packet *dhcp_pkt)
-{
- log1("Forwarding packet to relay");
-
- return udhcp_send_kernel_packet(dhcp_pkt,
- server_config.server_nip, SERVER_PORT,
- dhcp_pkt->gateway_nip, SERVER_PORT);
-}
-
-
-/* send a packet to a specific mac address and ip address by creating our own ip packet */
-static int send_packet_to_client(struct dhcp_packet *dhcp_pkt, int force_broadcast)
-{
- const uint8_t *chaddr;
- uint32_t ciaddr;
-
- // Was:
- //if (force_broadcast) { /* broadcast */ }
- //else if (dhcp_pkt->ciaddr) { /* unicast to dhcp_pkt->ciaddr */ }
- //else if (dhcp_pkt->flags & htons(BROADCAST_FLAG)) { /* broadcast */ }
- //else { /* unicast to dhcp_pkt->yiaddr */ }
- // But this is wrong: yiaddr is _our_ idea what client's IP is
- // (for example, from lease file). Client may not know that,
- // and may not have UDP socket listening on that IP!
- // We should never unicast to dhcp_pkt->yiaddr!
- // dhcp_pkt->ciaddr, OTOH, comes from client's request packet,
- // and can be used.
-
- if (force_broadcast
- || (dhcp_pkt->flags & htons(BROADCAST_FLAG))
- || !dhcp_pkt->ciaddr
- ) {
- log1("Broadcasting packet to client");
- ciaddr = INADDR_BROADCAST;
- chaddr = MAC_BCAST_ADDR;
- } else {
- log1("Unicasting packet to client ciaddr");
- ciaddr = dhcp_pkt->ciaddr;
- chaddr = dhcp_pkt->chaddr;
- }
-
- return udhcp_send_raw_packet(dhcp_pkt,
- /*src*/ server_config.server_nip, SERVER_PORT,
- /*dst*/ ciaddr, CLIENT_PORT, chaddr,
- server_config.ifindex);
-}
-
-
-/* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */
-static int send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
-{
- if (dhcp_pkt->gateway_nip)
- return send_packet_to_relay(dhcp_pkt);
- return send_packet_to_client(dhcp_pkt, force_broadcast);
-}
-
-
-static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacket, char type)
-{
- udhcp_init_header(packet, type);
- packet->xid = oldpacket->xid;
- memcpy(packet->chaddr, oldpacket->chaddr, sizeof(oldpacket->chaddr));
- packet->flags = oldpacket->flags;
- packet->gateway_nip = oldpacket->gateway_nip;
- packet->ciaddr = oldpacket->ciaddr;
- add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
-}
-
-
-/* add in the bootp options */
-static void add_bootp_options(struct dhcp_packet *packet)
-{
- packet->siaddr_nip = server_config.siaddr_nip;
- if (server_config.sname)
- strncpy((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
- if (server_config.boot_file)
- strncpy((char*)packet->file, server_config.boot_file, sizeof(packet->file) - 1);
-}
-
-
-static uint32_t select_lease_time(struct dhcp_packet *packet)
-{
- uint32_t lease_time_sec = server_config.max_lease_sec;
- uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME);
- if (lease_time_opt) {
- move_from_unaligned32(lease_time_sec, lease_time_opt);
- lease_time_sec = ntohl(lease_time_sec);
- if (lease_time_sec > server_config.max_lease_sec)
- lease_time_sec = server_config.max_lease_sec;
- if (lease_time_sec < server_config.min_lease_sec)
- lease_time_sec = server_config.min_lease_sec;
- }
- return lease_time_sec;
-}
-
-
-/* send a DHCP OFFER to a DHCP DISCOVER */
-int FAST_FUNC send_offer(struct dhcp_packet *oldpacket)
-{
- struct dhcp_packet packet;
- uint32_t req_nip;
- uint32_t lease_time_sec = server_config.max_lease_sec;
- uint32_t static_lease_ip;
- uint8_t *req_ip_opt;
- const char *p_host_name;
- struct option_set *curr;
- struct in_addr addr;
-
- init_packet(&packet, oldpacket, DHCPOFFER);
-
- static_lease_ip = get_static_nip_by_mac(server_config.static_leases, oldpacket->chaddr);
-
- /* ADDME: if static, short circuit */
- if (!static_lease_ip) {
- struct dyn_lease *lease;
-
- lease = find_lease_by_mac(oldpacket->chaddr);
- /* The client is in our lease/offered table */
- if (lease) {
- signed_leasetime_t tmp = lease->expires - time(NULL);
- if (tmp >= 0)
- lease_time_sec = tmp;
- packet.yiaddr = lease->lease_nip;
- }
- /* Or the client has requested an IP */
- else if ((req_ip_opt = get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL
- /* (read IP) */
- && (move_from_unaligned32(req_nip, req_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 is not already taken/offered */
- && (!(lease = find_lease_by_nip(req_nip))
- /* or its taken, but expired */
- || is_expired_lease(lease))
- ) {
- packet.yiaddr = req_nip;
- }
- /* Otherwise, find a free IP */
- else {
- packet.yiaddr = find_free_or_expired_nip(oldpacket->chaddr);
- }
-
- if (!packet.yiaddr) {
- bb_error_msg("no IP addresses to give - OFFER abandoned");
- return -1;
- }
- p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
- if (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
- ) == 0
- ) {
- bb_error_msg("lease pool is full - OFFER abandoned");
- return -1;
- }
- lease_time_sec = select_lease_time(oldpacket);
- } else {
- /* It is a static lease... use it */
- packet.yiaddr = static_lease_ip;
- }
-
- add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
-
- 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;
- bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
- return send_packet(&packet, 0);
-}
-
-
-int FAST_FUNC send_NAK(struct dhcp_packet *oldpacket)
-{
- struct dhcp_packet packet;
-
- init_packet(&packet, oldpacket, DHCPNAK);
-
- log1("Sending NAK");
- return send_packet(&packet, 1);
-}
-
-
-int FAST_FUNC send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
-{
- struct dhcp_packet packet;
- struct option_set *curr;
- 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);
-
- add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
-
- 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;
- bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
-
- if (send_packet(&packet, 0) < 0)
- return -1;
-
- p_host_name = (const char*) 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();
- }
-
- return 0;
-}
-
-
-int FAST_FUNC send_inform(struct dhcp_packet *oldpacket)
-{
- struct dhcp_packet packet;
- struct option_set *curr;
-
- init_packet(&packet, oldpacket, DHCPACK);
-
- 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);
-
- return send_packet(&packet, 0);
-}