+++ /dev/null
-/* dhcpd.c
- *
- * udhcp Server
- * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
- * Chris Trew <ctrew@moreton.com.au>
- *
- * Rewrite by 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 <fcntl.h>
-#include <string.h>
-#include <stdlib.h>
-#include <sys/wait.h>
-#include <arpa/inet.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <sys/socket.h>
-#include <unistd.h>
-#include <signal.h>
-#include <errno.h>
-#include <sys/ioctl.h>
-#include <time.h>
-#include <sys/time.h>
-
-#include "dhcpd.h"
-#include "arpping.h"
-#include "socket.h"
-#include "options.h"
-#include "files.h"
-#include "serverpacket.h"
-#include "common.h"
-#include "signalpipe.h"
-#include "static_leases.h"
-
-
-/* globals */
-struct dhcpOfferedAddr *leases;
-struct server_config_t server_config;
-
-
-#ifdef COMBINED_BINARY
-int udhcpd_main(int argc, char *argv[])
-#else
-int main(int argc, char *argv[])
-#endif
-{
- fd_set rfds;
- struct timeval tv;
- int server_socket = -1;
- int bytes, retval;
- struct dhcpMessage packet;
- uint8_t *state;
- uint8_t *server_id, *requested;
- uint32_t server_id_align, requested_align;
- unsigned long timeout_end;
- struct option_set *option;
- struct dhcpOfferedAddr *lease;
- struct dhcpOfferedAddr static_lease;
- int max_sock;
- unsigned long num_ips;
-
- uint32_t static_lease_ip;
-
- memset(&server_config, 0, sizeof(struct server_config_t));
- read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
-
- /* Start the log, sanitize fd's, and write a pid file */
- start_log_and_pid("udhcpd", server_config.pidfile);
-
- if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) {
- memcpy(&server_config.lease, option->data + 2, 4);
- server_config.lease = ntohl(server_config.lease);
- }
- else server_config.lease = LEASE_TIME;
-
- /* Sanity check */
- // Let's try to fix http://bugs.debian.org/341139 (ericvb@debian.org - 16/12/05)
- //num_ips = ntohl(server_config.end) - ntohl(server_config.start);
- num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1;
- if (server_config.max_leases > num_ips) {
- LOG(LOG_ERR, "max_leases value (%lu) not sane, "
- "setting to %lu instead",
- server_config.max_leases, num_ips);
- server_config.max_leases = num_ips;
- }
-
- leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr));
- read_leases(server_config.lease_file);
-
- if (read_interface(server_config.interface, &server_config.ifindex,
- &server_config.server, server_config.arp) < 0)
- return 1;
-
-#ifndef UDHCP_DEBUG
- background(server_config.pidfile); /* hold lock during fork. */
-#endif
-
- /* Setup the signal pipe */
- udhcp_sp_setup();
-
- timeout_end = time(0) + server_config.auto_time;
- while(1) { /* loop until universe collapses */
-
- if (server_socket < 0)
- if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) {
- LOG(LOG_ERR, "FATAL: couldn't create server socket, %m");
- return 2;
- }
-
- max_sock = udhcp_sp_fd_set(&rfds, server_socket);
- if (server_config.auto_time) {
- tv.tv_sec = timeout_end - time(0);
- tv.tv_usec = 0;
- }
- if (!server_config.auto_time || tv.tv_sec > 0) {
- retval = select(max_sock + 1, &rfds, NULL, NULL,
- server_config.auto_time ? &tv : NULL);
- } else retval = 0; /* If we already timed out, fall through */
-
- if (retval == 0) {
- write_leases();
- timeout_end = time(0) + server_config.auto_time;
- continue;
- } else if (retval < 0 && errno != EINTR) {
- DEBUG(LOG_INFO, "error on select");
- continue;
- }
-
- switch (udhcp_sp_read(&rfds)) {
- case SIGUSR1:
- LOG(LOG_INFO, "Received a SIGUSR1");
- write_leases();
- /* why not just reset the timeout, eh */
- timeout_end = time(0) + server_config.auto_time;
- continue;
- case SIGTERM:
- LOG(LOG_INFO, "Received a SIGTERM");
- return 0;
- case 0: break; /* no signal */
- default: continue; /* signal or error (probably EINTR) */
- }
-
- if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */
- if (bytes == -1 && errno != EINTR) {
- DEBUG(LOG_INFO, "error on read, %m, reopening socket");
- close(server_socket);
- server_socket = -1;
- }
- continue;
- }
-
- if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
- DEBUG(LOG_ERR, "couldn't get option from packet, ignoring");
- continue;
- }
-
- /* Look for a static lease */
- static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);
-
- if(static_lease_ip)
- {
- printf("Found static lease: %x\n", static_lease_ip);
-
- memcpy(&static_lease.chaddr, &packet.chaddr, 16);
- static_lease.yiaddr = static_lease_ip;
- static_lease.expires = 0;
-
- lease = &static_lease;
-
- }
- else
- {
- lease = find_lease_by_chaddr(packet.chaddr);
- }
-
- switch (state[0]) {
- case DHCPDISCOVER:
- DEBUG(LOG_INFO,"received DISCOVER");
-
- if (sendOffer(&packet) < 0) {
- LOG(LOG_ERR, "send OFFER failed");
- }
- break;
- case DHCPREQUEST:
- DEBUG(LOG_INFO, "received REQUEST");
-
- requested = get_option(&packet, DHCP_REQUESTED_IP);
- server_id = get_option(&packet, DHCP_SERVER_ID);
-
- if (requested) memcpy(&requested_align, requested, 4);
- if (server_id) memcpy(&server_id_align, server_id, 4);
-
- if (lease) {
- if (server_id) {
- /* SELECTING State */
- DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align));
- if (server_id_align == server_config.server && requested &&
- requested_align == lease->yiaddr) {
- sendACK(&packet, lease->yiaddr);
- }
- } else {
- if (requested) {
- /* INIT-REBOOT State */
- if (lease->yiaddr == requested_align)
- sendACK(&packet, lease->yiaddr);
- else sendNAK(&packet);
- } else {
- /* RENEWING or REBINDING State */
- if (lease->yiaddr == packet.ciaddr)
- sendACK(&packet, lease->yiaddr);
- else {
- /* don't know what to do!!!! */
- sendNAK(&packet);
- }
- }
- }
-
- /* what to do if we have no record of the client */
- } else if (server_id) {
- /* SELECTING State */
-
- } else if (requested) {
- /* INIT-REBOOT State */
- if ((lease = find_lease_by_yiaddr(requested_align))) {
- if (lease_expired(lease)) {
- /* probably best if we drop this lease */
- memset(lease->chaddr, 0, 16);
- /* make some contention for this address */
- } else sendNAK(&packet);
- } else if (requested_align < server_config.start ||
- requested_align > server_config.end) {
- sendNAK(&packet);
- } /* else remain silent */
-
- } else {
- /* RENEWING or REBINDING State */
- }
- break;
- case DHCPDECLINE:
- DEBUG(LOG_INFO,"received DECLINE");
- if (lease) {
- memset(lease->chaddr, 0, 16);
- lease->expires = time(0) + server_config.decline_time;
- }
- break;
- case DHCPRELEASE:
- DEBUG(LOG_INFO,"received RELEASE");
- if (lease) lease->expires = time(0);
- break;
- case DHCPINFORM:
- DEBUG(LOG_INFO,"received INFORM");
- send_inform(&packet);
- break;
- default:
- LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
- }
- }
-
- return 0;
-}
-
projects / grml-terminalserver.git / blobdiff