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>
This commit is contained in:
Denys Vlasenko
parent
de9e772f46
commit
8a7c166ab9
@ -17,8 +17,7 @@ lib-$(CONFIG_UDHCPC) += dhcpc.o clientpacket.o clientsocket.o \
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UDHCPC_NEEDS_ARPING-$(CONFIG_FEATURE_UDHCPC_ARPING) = y
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lib-$(UDHCPC_NEEDS_ARPING-y) += arpping.o
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lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o \
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serverpacket.o static_leases.o
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lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o static_leases.o
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lib-$(CONFIG_DUMPLEASES) += dumpleases.o
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lib-$(CONFIG_DHCPRELAY) += dhcprelay.o
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@ -1,13 +1,24 @@
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/* vi: set sw=4 ts=4: */
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/* dhcpd.c
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*
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/*
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* udhcp Server
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* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
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* Chris Trew <ctrew@moreton.com.au>
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*
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* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <syslog.h>
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@ -17,6 +28,254 @@
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#include "options.h"
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/* send a packet to gateway_nip using the kernel ip stack */
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static int send_packet_to_relay(struct dhcp_packet *dhcp_pkt)
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{
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log1("Forwarding packet to relay");
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return udhcp_send_kernel_packet(dhcp_pkt,
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server_config.server_nip, SERVER_PORT,
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dhcp_pkt->gateway_nip, SERVER_PORT);
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}
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/* send a packet to a specific mac address and ip address by creating our own ip packet */
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static int send_packet_to_client(struct dhcp_packet *dhcp_pkt, int force_broadcast)
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{
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const uint8_t *chaddr;
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uint32_t ciaddr;
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// Was:
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//if (force_broadcast) { /* broadcast */ }
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//else if (dhcp_pkt->ciaddr) { /* unicast to dhcp_pkt->ciaddr */ }
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//else if (dhcp_pkt->flags & htons(BROADCAST_FLAG)) { /* broadcast */ }
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//else { /* unicast to dhcp_pkt->yiaddr */ }
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// But this is wrong: yiaddr is _our_ idea what client's IP is
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// (for example, from lease file). Client may not know that,
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// and may not have UDP socket listening on that IP!
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// We should never unicast to dhcp_pkt->yiaddr!
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// dhcp_pkt->ciaddr, OTOH, comes from client's request packet,
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// and can be used.
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if (force_broadcast
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|| (dhcp_pkt->flags & htons(BROADCAST_FLAG))
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|| !dhcp_pkt->ciaddr
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) {
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log1("Broadcasting packet to client");
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ciaddr = INADDR_BROADCAST;
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chaddr = MAC_BCAST_ADDR;
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} else {
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log1("Unicasting packet to client ciaddr");
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ciaddr = dhcp_pkt->ciaddr;
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chaddr = dhcp_pkt->chaddr;
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}
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return udhcp_send_raw_packet(dhcp_pkt,
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/*src*/ server_config.server_nip, SERVER_PORT,
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/*dst*/ ciaddr, CLIENT_PORT, chaddr,
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server_config.ifindex);
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}
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/* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */
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static int send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
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{
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if (dhcp_pkt->gateway_nip)
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return send_packet_to_relay(dhcp_pkt);
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return send_packet_to_client(dhcp_pkt, force_broadcast);
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}
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static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacket, char type)
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{
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udhcp_init_header(packet, type);
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packet->xid = oldpacket->xid;
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memcpy(packet->chaddr, oldpacket->chaddr, sizeof(oldpacket->chaddr));
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packet->flags = oldpacket->flags;
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packet->gateway_nip = oldpacket->gateway_nip;
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packet->ciaddr = oldpacket->ciaddr;
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add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
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}
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/* add in the bootp options */
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static void add_bootp_options(struct dhcp_packet *packet)
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{
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packet->siaddr_nip = server_config.siaddr_nip;
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if (server_config.sname)
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strncpy((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
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if (server_config.boot_file)
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strncpy((char*)packet->file, server_config.boot_file, sizeof(packet->file) - 1);
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}
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static uint32_t select_lease_time(struct dhcp_packet *packet)
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{
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uint32_t lease_time_sec = server_config.max_lease_sec;
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uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME);
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if (lease_time_opt) {
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move_from_unaligned32(lease_time_sec, lease_time_opt);
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lease_time_sec = ntohl(lease_time_sec);
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if (lease_time_sec > server_config.max_lease_sec)
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lease_time_sec = server_config.max_lease_sec;
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if (lease_time_sec < server_config.min_lease_sec)
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lease_time_sec = server_config.min_lease_sec;
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}
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return lease_time_sec;
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}
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/* send a DHCP OFFER to a DHCP DISCOVER */
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static int send_offer(struct dhcp_packet *oldpacket)
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{
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struct dhcp_packet packet;
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uint32_t req_nip;
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uint32_t lease_time_sec = server_config.max_lease_sec;
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uint32_t static_lease_ip;
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uint8_t *req_ip_opt;
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const char *p_host_name;
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struct option_set *curr;
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struct in_addr addr;
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init_packet(&packet, oldpacket, DHCPOFFER);
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static_lease_ip = get_static_nip_by_mac(server_config.static_leases, oldpacket->chaddr);
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/* ADDME: if static, short circuit */
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if (!static_lease_ip) {
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struct dyn_lease *lease;
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lease = find_lease_by_mac(oldpacket->chaddr);
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/* The client is in our lease/offered table */
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if (lease) {
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signed_leasetime_t tmp = lease->expires - time(NULL);
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if (tmp >= 0)
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lease_time_sec = tmp;
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packet.yiaddr = lease->lease_nip;
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}
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/* Or the client has requested an IP */
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else if ((req_ip_opt = get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL
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/* (read IP) */
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&& (move_from_unaligned32(req_nip, req_ip_opt), 1)
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/* and the IP is in the lease range */
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&& ntohl(req_nip) >= server_config.start_ip
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&& ntohl(req_nip) <= server_config.end_ip
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/* and is not already taken/offered */
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&& (!(lease = find_lease_by_nip(req_nip))
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/* or its taken, but expired */
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|| is_expired_lease(lease))
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) {
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packet.yiaddr = req_nip;
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}
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/* Otherwise, find a free IP */
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else {
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packet.yiaddr = find_free_or_expired_nip(oldpacket->chaddr);
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}
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if (!packet.yiaddr) {
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bb_error_msg("no IP addresses to give - OFFER abandoned");
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return -1;
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}
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p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
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if (add_lease(packet.chaddr, packet.yiaddr,
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server_config.offer_time,
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p_host_name,
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p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
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) == 0
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) {
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bb_error_msg("lease pool is full - OFFER abandoned");
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return -1;
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}
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lease_time_sec = select_lease_time(oldpacket);
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} else {
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/* It is a static lease... use it */
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packet.yiaddr = static_lease_ip;
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}
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add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
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curr = server_config.options;
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while (curr) {
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if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
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add_option_string(packet.options, curr->data);
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curr = curr->next;
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}
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add_bootp_options(&packet);
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addr.s_addr = packet.yiaddr;
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bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
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return send_packet(&packet, 0);
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}
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static int send_NAK(struct dhcp_packet *oldpacket)
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{
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struct dhcp_packet packet;
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init_packet(&packet, oldpacket, DHCPNAK);
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log1("Sending NAK");
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return send_packet(&packet, 1);
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}
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static int send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
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{
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struct dhcp_packet packet;
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struct option_set *curr;
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uint32_t lease_time_sec;
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struct in_addr addr;
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const char *p_host_name;
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init_packet(&packet, oldpacket, DHCPACK);
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packet.yiaddr = yiaddr;
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lease_time_sec = select_lease_time(oldpacket);
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add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
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curr = server_config.options;
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while (curr) {
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if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
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add_option_string(packet.options, curr->data);
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curr = curr->next;
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}
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add_bootp_options(&packet);
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addr.s_addr = packet.yiaddr;
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bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
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if (send_packet(&packet, 0) < 0)
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return -1;
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p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
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add_lease(packet.chaddr, packet.yiaddr,
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lease_time_sec,
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p_host_name,
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p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
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);
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if (ENABLE_FEATURE_UDHCPD_WRITE_LEASES_EARLY) {
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/* rewrite the file with leases at every new acceptance */
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write_leases();
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}
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return 0;
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}
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static int send_inform(struct dhcp_packet *oldpacket)
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{
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struct dhcp_packet packet;
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struct option_set *curr;
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init_packet(&packet, oldpacket, DHCPACK);
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curr = server_config.options;
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while (curr) {
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if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
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add_option_string(packet.options, curr->data);
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curr = curr->next;
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}
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add_bootp_options(&packet);
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return send_packet(&packet, 0);
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}
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/* globals */
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struct dyn_lease *g_leases;
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/* struct server_config_t server_config is in bb_common_bufsiz1 */
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@ -124,14 +124,6 @@ void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
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#endif
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/*** serverpacket.h ***/
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int send_offer(struct dhcp_packet *oldpacket) FAST_FUNC;
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int send_NAK(struct dhcp_packet *oldpacket) FAST_FUNC;
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int send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr) FAST_FUNC;
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int send_inform(struct dhcp_packet *oldpacket) FAST_FUNC;
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/*** files.h ***/
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void read_config(const char *file) FAST_FUNC;
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@ -1,283 +0,0 @@
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/* vi: set sw=4 ts=4: */
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/* serverpacket.c
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*
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* Construct and send DHCP server packets
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*
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* Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "common.h"
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#include "dhcpc.h"
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#include "dhcpd.h"
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#include "options.h"
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/* send a packet to gateway_nip using the kernel ip stack */
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static int send_packet_to_relay(struct dhcp_packet *dhcp_pkt)
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{
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log1("Forwarding packet to relay");
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return udhcp_send_kernel_packet(dhcp_pkt,
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server_config.server_nip, SERVER_PORT,
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dhcp_pkt->gateway_nip, SERVER_PORT);
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}
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/* send a packet to a specific mac address and ip address by creating our own ip packet */
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static int send_packet_to_client(struct dhcp_packet *dhcp_pkt, int force_broadcast)
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{
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const uint8_t *chaddr;
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uint32_t ciaddr;
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// Was:
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//if (force_broadcast) { /* broadcast */ }
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//else if (dhcp_pkt->ciaddr) { /* unicast to dhcp_pkt->ciaddr */ }
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//else if (dhcp_pkt->flags & htons(BROADCAST_FLAG)) { /* broadcast */ }
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//else { /* unicast to dhcp_pkt->yiaddr */ }
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// But this is wrong: yiaddr is _our_ idea what client's IP is
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// (for example, from lease file). Client may not know that,
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// and may not have UDP socket listening on that IP!
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// We should never unicast to dhcp_pkt->yiaddr!
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// dhcp_pkt->ciaddr, OTOH, comes from client's request packet,
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// and can be used.
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if (force_broadcast
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|| (dhcp_pkt->flags & htons(BROADCAST_FLAG))
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|| !dhcp_pkt->ciaddr
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) {
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log1("Broadcasting packet to client");
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ciaddr = INADDR_BROADCAST;
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chaddr = MAC_BCAST_ADDR;
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} else {
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log1("Unicasting packet to client ciaddr");
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ciaddr = dhcp_pkt->ciaddr;
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chaddr = dhcp_pkt->chaddr;
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}
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return udhcp_send_raw_packet(dhcp_pkt,
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/*src*/ server_config.server_nip, SERVER_PORT,
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/*dst*/ ciaddr, CLIENT_PORT, chaddr,
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server_config.ifindex);
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}
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/* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */
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static int send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
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{
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if (dhcp_pkt->gateway_nip)
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return send_packet_to_relay(dhcp_pkt);
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return send_packet_to_client(dhcp_pkt, force_broadcast);
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}
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static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacket, char type)
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{
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udhcp_init_header(packet, type);
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packet->xid = oldpacket->xid;
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memcpy(packet->chaddr, oldpacket->chaddr, sizeof(oldpacket->chaddr));
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packet->flags = oldpacket->flags;
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packet->gateway_nip = oldpacket->gateway_nip;
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packet->ciaddr = oldpacket->ciaddr;
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add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
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}
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/* add in the bootp options */
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static void add_bootp_options(struct dhcp_packet *packet)
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{
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packet->siaddr_nip = server_config.siaddr_nip;
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if (server_config.sname)
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strncpy((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
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if (server_config.boot_file)
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strncpy((char*)packet->file, server_config.boot_file, sizeof(packet->file) - 1);
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}
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static uint32_t select_lease_time(struct dhcp_packet *packet)
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{
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uint32_t lease_time_sec = server_config.max_lease_sec;
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uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME);
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if (lease_time_opt) {
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move_from_unaligned32(lease_time_sec, lease_time_opt);
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lease_time_sec = ntohl(lease_time_sec);
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if (lease_time_sec > server_config.max_lease_sec)
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lease_time_sec = server_config.max_lease_sec;
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if (lease_time_sec < server_config.min_lease_sec)
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lease_time_sec = server_config.min_lease_sec;
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}
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return lease_time_sec;
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}
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|
||||
/* 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);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user